ABB OY Patent applications |
Patent application number | Title | Published |
20150381166 | GATE DRIVE CIRCUIT WITH A VOLTAGE STABILIZER AND A METHOD - A gate drive circuit creates a bipolar voltage to a gate of an IGB power transistor, and compensates for Miller currents of the IGB power transistor. The compensating is performed by a switching element connected in series with a capacitor between the gate (X | 12-31-2015 |
20150329191 | COOLING ARRANGEMENT FOR A PROPULSION UNIT - A propulsion unit is disclosed with a hollow strut having an upper portion with an upper end portion passing through a passage (P | 11-19-2015 |
20150287551 | MOVABLE CONTACT OF ELECTRIC SWITCH - A movable contact of a rotary switch, including a pair of contact blades for making an electrical contact to a stationary contact receivable between the contact blades. The movable contact includes a traction member for providing a traction force between the contact blades, wherein the traction member is a unitary piece including two frame portions for framing the pair of contact blades, the traction member including a spring portion for pressing one of the contact blades against the other contact blade, wherein the spring portion is arranged between the two frame portions arranged at a distance from each other. | 10-08-2015 |
20150266707 | METHOD FOR OPERATING WINCH, AND WINCH - A method for operating a winch and a winch having a winch drum for spooling a spoolable medium, wherein the winch drum is rotatable about a first axis, a guiding member for guiding the spoolable medium, wherein the guiding member is movable along a second axis between two end positions, and an electric drive having a first electric motor for driving the guiding member towards one of the two end positions during spooling in or spooling out of the spoolable medium. The electric drive is configured to change the driving direction of the guiding member when a monitored torque of the first electric motor, or a quantity indicative thereof, exceeds a predetermined threshold. | 09-24-2015 |
20150259174 | CONDITION MONITORING OF VERTICAL TRANSPORT EQUIPMENT - A method and arrangement are disclosed for detecting a working condition of a mechanical brake of vertical transport equipment, the vertical transport equipment including a frequency converter, an electrical motor and a mechanical brake. Movement of the vertical transport equipment can be controlled using a frequency converter configured to feed electrical power to the motor, the mechanical brake being configured to mechanically hold a car or load of the vertical transport equipment. Data relating to deceleration of the car or load is used as reference data. The mechanical brake is controlled into a closed position for decelerating movement of the car or load. Test data, relating to deceleration of the car or load is measured from information or from a control system of the frequency converter, and compared with reference data. | 09-17-2015 |
20150204338 | FAN APPARATUS AND COOLED ELECTRICAL ASSEMBLY - A fan apparatus is disclosed having a first fan and a second fan, both of which are centrifugal fans. Impellers of the first fan and the second fan can be located adjacent one another and adapted to rotate in opposite directions. A first outlet opening (ot | 07-23-2015 |
20150198638 | METHOD AND DEVICE FOR ESTIMATING POWER AND/OR CURRENT OF INVERTER - An exemplary device and method for estimating an active and/or reactive component of output power of a three-level inverter having a DC link divided into two halves by a neutral point. The device having control unit for determining a voltage ripple at the neutral point, determining a magnitude of a third harmonic component of the voltage ripple in a rotating coordinate system that rotates synchronously with an output voltage of the inverter, and calculating a component of an output current or power in the rotating coordinate system on the basis of the magnitude of the third harmonic component. | 07-16-2015 |
20150180463 | MONITORING METHOD AND DEVICE FOR POWER SEMICONDUCTOR SWITCH - An exemplary power semiconductor switch is configured to be controlled on the basis of a gate voltage signal driven by a gate driver unit. The device includes a measuring component for generating a saturation voltage signal on the basis of a voltage over the power semiconductor switch, and an auxiliary switch connected between a saturation voltage signal line carrying the saturation voltage signal and an output of the gate driver unit driving the gate voltage signal. The auxiliary switch is configured to be controlled to a conductive state or a non-conductive state on the basis of the gate voltage signal. A feedback component is provided for generating a saturation feedback signal on the basis of the saturation voltage signal. | 06-25-2015 |
20150156919 | ELECTRIC APPARATUS - An exemplary electric apparatus includes a fan for generating a first airflow, a component space includes a secondary electric component, and a housing. In order to obtain efficient cooling solution one or more walls separate the component space including the secondary electric component from the first cooling element for preventing the first airflow from entering the component space. A second cooling element has a first end in the component space and a second end located outside of the component space for dissipating heat received from the secondary electric component to the first airflow. | 06-04-2015 |
20150155700 | METHOD AND APPARATUS FOR SHORT CIRCUIT PROTECTION OF POWER SEMICONDUCTOR SWITCH - A method and apparatus are provided for a power semiconductor switch. A current through the switch is responsive to a control terminal voltage at a control terminal of the switch, and the control terminal voltage is driven by a driver unit. The method includes measuring or estimating the current based on a bond voltage of the switch, detecting a short circuit by comparing the measured or estimated current to a short circuit current limit, controlling an on-state voltage level of the control terminal voltage based on the comparison to limit the current through the switch during the short circuit, and controlling the control terminal voltage to an off-state voltage level to turn the switch off. The on-state voltage level voltage is controlled by pulse-width modulating the output of the driver unit. A switching frequency of the modulation is at least the cut-off frequency of low-pass characteristics of the control terminal. | 06-04-2015 |
20150136358 | COOLING ELEMENT - A cooling element includes a first surface for receiving an electric component, and a second surface which is provided with fins for forwarding a heat load received from the electric component via the first surface to surroundings. One or more of the fins are provided with a respective flow channel for passing a fluid within each respective fin, to provide efficient cooling. | 05-21-2015 |
20150131345 | METHOD AND APPARATUS FOR MINIMISING A CIRCULATING CURRENT OR A COMMON-MODE VOLTAGE OF AN INVERTER - The present disclosure discloses a method and an apparatus implementing the method for minimising a circulating current of parallel-connected inverters. The method can include, for at least one parallel-connected inverter, measuring a common-mode voltage of the inverter, and controlling a cycle length of the switching cycle on the basis of the common-mode voltage. | 05-14-2015 |
20150116937 | ELECTRONIC DEVICE WITH WATERPROOF ENCLOSURE - An electronic device including a sealed enclosure, the electronic components arranged inside the sealed enclosure and including high-loss high-temperature components, a main heat sink including ribs, wherein the high-loss high-temperature components are attached to the main heat sink and the ribs of the main heat sink are arranged outside the enclosure, a cavity formed inside the enclosure and divided into a plurality of channel-like sections, the channel-like sections configured for providing air flow guidance inside the enclosure and being interconnected at their ends, wherein at least one channel-like section contains the electronic components and at least one other channel-like section contains an air-to-air heat exchanger extending from inside the sealed enclosure to outside of the sealed enclosure, wherein the electronic components inside the at least one channel like section are adapted to be cooled by air flow inside the sealed enclosure. | 04-30-2015 |
20150098258 | CONVERTER CIRCUIT - A converter circuit with short-circuit protection can include a plurality of phase legs having a series connection of normally-on switches, between voltage rails of a DC voltage link, a DC link capacitor, and AC voltage connection points between the normally-on switches. A phase-to-phase short-circuit protection circuit includes a parallel connection of a resistive component and a controllable switch. The phase-to-phase short-circuit protection circuit including a first terminal connected to an AC voltage connection point and a second terminal forms an input or an output of the converter circuit; and a controllable switch is connected in series with the DC link capacitor. Upon lack of control of the normally-on switches the controllable switch of the at least one phase-to-phase short-circuit protection circuit and the controllable switch of the phase leg short-circuit protection circuit are adapted to be controlled to a non-conductive state. | 04-09-2015 |
20150093255 | METHOD AND ARRANGEMENT FOR CONTROLLING A SOLAR POWERED PUMP - A method and arrangement are disclosed for operating a pump in pump system having a photovoltaic panel system, an inverter electrically connected to the photovoltaic panel system, and a motor driving the pump and electrically connected to the output of the inverter. The method can include setting a voltage limit for the inverter, monitoring the voltage produced by the photovoltaic panel system, operating the inverter for rotating of the motor when the voltage produced by the photovoltaic panel system is above the voltage limit, and disabling use of the inverter when the voltage of the photovoltaic system remains below the voltage limit. | 04-02-2015 |
20150091487 | METHOD AND ARRANGEMENT FOR OPERATING A PUMP - A method and arrangement for operating a pump system are disclosed, the pump system including a pump arranged to be rotated with an AC motor, an inverter, the output of which is electrically connected to the AC motor, and a photovoltaic panel system electrically connected to feed DC power to the inverter. The method can include setting a voltage limit, and determining continuously voltage obtained from the photovoltaic panel system. When the determined voltage of the photovoltaic panel system is below the set voltage limit, frequency of the inverter can be controlled such that the ratio between output voltage of the inverter and the output frequency is substantially constant. When the determined voltage of the photovoltaic panel system exceeds the voltage limit, the inverter frequency can be controlled for keeping voltage of the photovoltaic panel system substantially at the voltage limit. | 04-02-2015 |
20150091381 | METHOD AND AN ARRANGEMENT IN CONNECTION WITH A SOLAR ENERGY SYSTEM - An arrangement and a method are provided in connection with a solar energy system. The arrangement includes solar panels and a converter for converting the DC voltage from the solar panels. The converter is arranged inside a container or a similar closed structure. The arrangement includes means for producing heat from the energy produced by the solar panels. The means are arranged inside the container or a similar closed structure and are electrically connectable to the solar panels. | 04-02-2015 |
20150090696 | ELECTRIC CURRENT SWITCHING APPARATUS - An electric switch includes first and second stationary contacts, and a movable contact for making an electrical connection between the first and second stationary contacts. The movable contact is pivotally connected to the first stationary contact by a pivotal connection for allowing the movable contact to pivot with respect to the first stationary contact about a pivoting axis such that in an open position of the switch, the movable contact is disconnected from the second stationary contact, and in a closed position of the switch, the movable contact is in contact with the second stationary contact. The movable contact and the first stationary contact are arranged in a first angle with respect to each other in the open position of the switch, and in a second angle with respect to each other in the closed position of the switch, and the second angle is greater than the first angle. | 04-02-2015 |
20150090695 | ELECTRIC CURRENT SWITCHING APPARATUS - An exemplary movable contact for an electric switch having a first contact blade and a second contact blade. Each of the first contact blade and the second contact blade includes an assembly hole. The movable contact having an assembly pin wherein the assembly pin includes a separation portion having a diameter greater than the assembly holes of the first and second contact blades thereby keeping the first and second contact blades separated from each other. The assembly pin includes a contact blade portion on each side of the separation portion for insertion to the assembly holes of the contact blades. | 04-02-2015 |
20150086382 | PUMPING SYSTEM CONTROL - A method and a control arrangement are disclosed to measure a total flow rate through a pump device before a pump pressure or rotational speed change; and to change at least one of: the pump pressure by a predetermined pressure step or the pump rotational speed by a predetermined rotational speed step. The arrangement can measure a total flow rate through the pump device after the pump pressure or rotational speed change; and determine a need for a further pump pressure or rotational speed change step based on total flow rate measurements carried out before and after the pump pressure change. | 03-26-2015 |
20150048157 | MANUAL, A METHOD, APPARATUS AND A COMPUTER PROGRAM PRODUCT FOR CONFIGURING A FREQUENCY CONVERTER - A manual is disclosed for a frequency converter and a method, apparatus and a computer program product are disclosed for configuring a frequency converter. The manual can include a data storage storing operational configuration information of the frequency converter; wherein the configuration information is encoded to the data storage to be wirelessly readable from the data storage. The configuration information is obtained from the manual by wireless reading, and installed to the frequency converter by transmitting the obtained configuration information over a wireless connection. | 02-19-2015 |
20150045957 | ACTUATOR ASSEMBLY - An actuator assembly is disclosed, which includes a power unit, an actuator powered by the power unit, the power unit being configured to provide a work motion of the actuator, a motion sensor, a timing unit for measuring an immobility time of the actuator, a safety unit for selectively placing the actuator assembly into an operational state and a safety state in which the work motion of the actuator can be prevented, the safety unit being configured to prevent the operational state of the actuator assembly in case the immobility time of the actuator exceeds a predetermined process safety time. The actuator assembly can include an activation unit configured to control the power unit to provide an activation motion of the actuator in case the immobility time exceeds a predetermined activation time. | 02-12-2015 |
20150041438 | ELECTRIC CURRENT SWITCHING APPARATUS - An electric switch is disclosed which includes a housing module housing a movable contact and a stationary contact having a contact portion to be contacted by the movable contact . The stationary contact can include a mounting portion, which mounting portion can be positioned closer to the centre of the housing module than the contact portion of the stationary contact. | 02-12-2015 |
20150027984 | ELECTRIC CURRENT SWITCHING APPARATUS - An arc quenching plate for an electric switch includes a first mounting portion and a second mounting portion for mounting the quenching plate to respective recesses of the switch. The first mounting portion and the second mounting portion have a different form when compared to each other. | 01-29-2015 |
20150027983 | ELECTRIC CURRENT SWITCHING APPARATUS - An electric switch includes a movable contact, a stationary contact to be contacted by the movable contact, one or more quenching plates, and a permanent magnet for directing an arc, which is formed when the contacts are separated from each other, to the quenching plate. The quenching plate has a base portion and side portions extending away from the base portion. The permanent magnet is arranged such that the arc is directed towards one of the side portions of the quenching plate. | 01-29-2015 |
20150019033 | PROVIDING USER INTERFACE OF A FREQUENCY CONVERTER OVER A WIRELESS CONNECTION - A user interface of frequency converter over a wireless connection is disclosed. The frequency converter can be connected to a mobile communications device over a short range wireless connection. The mobile communications device can be connected to a wide area network to a service center maintaining information associated with frequency converters. Operational information of the frequency converter can be relayed to the service center over the wide area network as a view of the frequency converter user interface. The frequency converter can be controlled by control commands from the mobile communications device, the control commands being determined based on selections received from the service center, in response to the view conveyed to the service center. | 01-15-2015 |
20150017033 | SHIP'S PROPULSION UNIT - The disclosure relates to a ship's propulsion unit including a shell structure arranged below a hull of the ship and an electric motor for rotating a propeller. The propulsion unit can include a closed gas circulation cooling system containing gas and include a gas circulation device for circulating gas through channels in the electric motor, a closed liquid cooling system having an inner space containing liquid, and a gas-liquid-heat exchanger in fluid connection with the closed gas circulation cooling system and with the closed liquid cooling system for exchanging thermal energy between gas circulating in the closed gas circulation cooling system and liquid in the closed liquid cooling system. | 01-15-2015 |
20150017032 | SHIP'S PROPULSION UNIT - The present disclosure relates to a ship's propulsion unit which includes: a closed liquid cooling system having an inner space containing liquid. The inner space is partly limited by a cylindrical outer surface of a cylindrical section of a motor housing section of the propulsion unit for exchanging thermal energy between an electric motor arranged in the cylindrical section of the motor housing section and liquid in the inner space. The inner space of the closed liquid cooling system is partly limited by the shell structure of the propulsion unit so that liquid in the inner space is in direct contact with the shell structure of the propulsion unit for exchanging thermal energy between liquid in the inner space and water surrounding the propulsion unit via the shell structure of the propulsion unit. | 01-15-2015 |
20150015105 | SHIP'S PROPULSION UNIT - The present disclosure relates to a ship's propulsion unit such as a ship's azimuthing propulsion unit. The propulsion unit can include at least one supporting metal sheet arranged between an support section of a shell structure of the propulsion unit and an cylindrical outer surface of a cylindrical section of a motor housing section of the shell structure for providing additional support for the motor housing section of the shell structure at the shell structure of the support section. | 01-15-2015 |
20140334213 | SWITCHING ARRANGEMENT FOR INVERTER, AND INVERTER - Exemplary embodiments are directed to a method and switching arrangement for an inverter. The inverter including a positive direct current pole, a negative direct current pole, and a neutral direct current pole. The arrangement having a first controllable switch connected between the neutral direct current pole of the inverter and a virtual neutral point of an alternating current network supplied by the inverter; and/or a second controllable switch connected between the neutral direct current pole of the inverter and an earth potential of an alternating current network supplied by the inverter. | 11-13-2014 |
20140313672 | COOLING APPARATUS - Exemplary embodiments of the present disclosure are directed to an apparatus including pipes having internal longitudinal walls dividing the pipes into channels, a first and a second connecting part for providing a flow path between the channels of the pipes, a first heat transfer element having a first base plate with a first surface for receiving a heat load from one or more electric components and for transferring the heat load to a fluid, and a second heat transfer element. In order to obtain an efficient apparatus at least one first pipe that is at a location of an electric component is at least partly embedded in the first base plate via a second surface of the first base plate, while the pipes which are not at the location of an electric component are not embedded in the first base plate. | 10-23-2014 |
20140309826 | PREVENTING OF SLIP IN AN ELECTRICALLY POWERED VEHICLE - A method and arrangement for preventing slip in a wheeled vehicle having two or more driving wheels that are operated with electric motors. The motor of each driving wheel includes a torque limit applicable to limit torque of the motor. For each driving wheel, the method includes setting an angular acceleration limit for the wheel, detecting angular acceleration of the driving wheel continuously, comparing the detected angular acceleration with the angular acceleration limit continuously, if the detected angular acceleration is higher than the angular acceleration limit, reducing the torque limit from its current value until the angular acceleration of the wheel is below the angular acceleration limit, increasing the torque limit at a first rate to a value lower than the value from which it was reduced, and increasing the torque limit at a second rate to the maximum value, the second rate being lower than the first rate. | 10-16-2014 |
20140268940 | METHOD FOR CONTROLLING SWITCHING BRANCH OF THREE-LEVEL CONVERTER AND SWITCHING BRANCH FOR THREE-LEVEL CONVERTER - Exemplary embodiments are directed to a method for controlling a switching branch of a three-level converter to enter a stop state. The switching branch including a first semiconductor switch and a second semiconductor switch, a first diode and a second diode, a third semiconductor switch and a fourth semiconductor switch, a third diode, and a fourth diode, a fifth semiconductor switch and a sixth semiconductor switch, a fifth diode, and a sixth diode, and a manner of controlling the semiconductor switches. When the switching branch is set to enter a stop state, current flowing in a main circuit of the switching branch is transferred in a controlled manner to diodes that conduct the current, when all the semiconductor switches of the main circuit of the converter are turned OFF. | 09-18-2014 |
20140252860 | METHOD AND ARRANGEMENT FOR OPERATING PHOTOVOLTAIC SYSTEM AND PHOTOVOLTAIC SYSTEM - Exemplary embodiments are directed to a system, method, apparatus, and arrangement for operating a photovoltaic system. The photovoltaic system including a boost converter having a controllable duty ratio, at least two strings of photovoltaic panels supplying an input of the boost converter, wherein the strings are connected in parallel with each other. The system having detector configured to detect a reverse current in any of the strings, and a controller configured to increase, in response to the detection of a reverse current in at least one of the strings, the duty ratio of the boost converter at least until the reverse current stops. | 09-11-2014 |
20140216681 | COOLING ASSEMBLY - A cooling assembly includes a device chamber, a cooling chamber separated from the device chamber, a heat exchanger, a device chamber fan arrangement and a control unit. The heat exchanger includes a first portion located in the device chamber and a second portion located in the cooling chamber for transferring heat from the device chamber to the cooling chamber. The device chamber fan arrangement is configured to generate a device chamber cooling medium flow including a first partial flow interacting with the first portion of the heat exchanger. The cooling assembly also includes a first throttle arrangement for regulating the first partial flow. The control unit is configured to reduce a cooling power of the heat exchanger as a response to predetermined operating conditions by decreasing the first partial flow with the first throttle arrangement. | 08-07-2014 |
20140216069 | COOLING ASSEMBLY AND DEHUMIDIFICATION METHOD - A cooling assembly includes a device chamber containing a device chamber cooling medium, a heat exchanger including at least one cooling surface in contact with the device chamber cooling medium, a control unit configured to control the heat exchanger, a humidity sensor configured to detect a humidity level in the device chamber, and a receptacle. The control unit is configured to perform a dehumidification operation as a response to the humidity level exceeding a predetermined threshold value in the device chamber. The dehumidification operation includes lowering a temperature of the at least one cooling surface in order to condensate water from the device chamber cooling medium on the at least one cooling surface. The receptacle is configured to receive water dripping from the at least one cooling surface. | 08-07-2014 |
20140182501 | PROPULSION ARRANGEMENT IN A SHIP - An exemplary propulsion arrangement is disclosed which includes two propulsion units situated side by side at the stern of a ship at opposite sides of a center line of the hull of the ship. Each propulsion unit can include a hollow support structure attached to the hull, a chamber attached to the support structure, an electric motor within the chamber, a propeller connected through a shaft to the electric motor, and a pivotably supported rudder at the rear end of the chamber. Each propulsion unit can be mounted in a toe-out position forming a horizontal tilt angle (β) of 0.5 to 6 degrees to the center line (CL) of the hull. | 07-03-2014 |
20140179178 | PROPULSION ARRANGEMENT IN A SHIP - An exemplary propulsion arrangement includes at least one propulsion unit situated at the stern of a ship having a hull with a horizontal water line (WL) and a center line (CL). The propulsion unit can include a hollow support structure attached to the hull, a chamber attached to the support structure, an electric motor within the chamber, a propeller at the front end of the chamber, and a pivotably supported rudder at the rear end of the chamber. The propulsion unit can be mounted so that the shaft line (SL) forms a vertical tilt angle (α) in a range of 1 to 8 degrees in relation to the water line (WL) so that the front end of the chamber is lower than the rear end of the chamber in relation to the water line (WL). | 06-26-2014 |
20140152210 | ARRANGEMENT AND METHOD FOR A VEHICLE INVERTER DRIVE - A method and arrangement are disclosed for a vehicle inverter drive having a voltage distribution block and two or more inverters, intermediate circuits of which are connected in parallel to the voltage distribution block for supplying voltage to the intermediate circuits, in which the intermediate circuits of the inverters are interconnected with a coaxial cable to minimize inductance in the parallel connection. | 06-05-2014 |
20140145505 | METHOD FOR OPERATING AN INVERTER AND AN INVERTER - A method for operating an inverter, and an inverter for coupling with a photovoltaic array having at least one photovoltaic panel are disclosed. The inverter can be configured: to connect output poles of the photovoltaic array in short circuit with each other; to measure a current supplied by the photovoltaic array through the output poles after they have been connected in short circuit with each other; and to start a DC-to-AC conversion of power supplied by the photovoltaic array if the measured current exceeds a predetermined threshold. | 05-29-2014 |
20140142794 | METHOD AND APPARATUS FOR MAXIMIZING ENERGY EFFICIENCY OF AN ELECTRIC DRIVE SYSTEM - A method and an apparatus are provided for maximizing energy efficiency of an electric drive system including an electric motor and a load. In the method, the torque characteristics of the system can be selected from two types of behavior: linear and quadratic behavior of a torque of the motor in respect to a rotational speed of the motor. The method gathers a plurality of data points and with which behavior the data points correlate best. The torque characteristics to be used are determined on the basis of the correlation, and the motor is controlled on the basis of the determined torque characteristics. The apparatus implements the method. | 05-22-2014 |
20140136000 | METHOD FOR APPROXIMATING A STATIC HEAD OF A FLUID TRANSFER SYSTEM - The present disclosure is directed to a method and apparatus for approximating a static head of a fluid transfer system including a fluid transfer device. The method can include determining a rotational speed and a power consumption of the fluid transfer device, determining a first set of data points, calculating a second set of data points on the basis of the first set of data points, determining a minimum rotational speed producing flow through the fluid transfer device on the basis of the second set of data points, and determining the static head on the basis of the minimum rotational speed. | 05-15-2014 |
20140115918 | ARRANGEMENT FOR REMOVING WATER FROM AN EQUIPMENT SPACE - Exemplary embodiments are directed to an equipment space that is a closed space provided with electrical equipment and an air dryer condensing the moisture of the air in the equipment space into water. A system for removing water from the equipment space includes a porous element having a capillary structure and being located in an outlet opening of the equipment space. The porous element is connected such that water condensed by the air dryer is directed to a first inner surface of the porous element. The capillary structure of the porous element is configured to propogate water from the inner surface of the porous element to an outer surface of the porous element. The outer surface of the porous element is configured to release water to ambient air outside the equipment space. | 05-01-2014 |
20140103885 | MAXIMUM POWER POINT TRACKING - A method and an arrangement of tracking a selected (e.g., maximum) power point of a photovoltaic system is disclosed, in which method an operation point of the photovoltaic system is changed based on the change of operation point and a change of power generated by the photovoltaic system. The method can include repeatedly determining a current or voltage of the photovoltaic system, determining a power of the photovoltaic system, determining a change of power of the photovoltaic system with respect to a previous determined power, and changing the operation point of the photovoltaic system by changing a current or voltage reference of the system stepwise depending on the change of power and a direction of a previous change of the current or voltage reference. | 04-17-2014 |
20140103729 | STARTING OF A SOLAR POWER PLANT - A method of optimizing one or more starting parameters of a solar power generator system and a solar power generator system, wherein the solar power generator system includes a solar panel array and a converter for converting power obtained from the panel array. The method can include measuring an output voltage of the panel array, comparing the output voltage with a starting voltage (V | 04-17-2014 |
20140098449 | METHOD FOR DETECTING ISLANDING OPERATION OF DISTRIBUTED POWER GENERATOR - A method and an arrangement are disclosed for detecting islanding operation of a distributed power generator. The method can include determining a frequency of a grid to which the distributed power generator is connected, measuring a rate of change of the frequency of the grid at an output of the distributed power generator, determining a threshold value for an alteration speed, comparing the rate of change of the frequency of the grid with the threshold value, and detecting islanding operation when the measured rate of change of the frequency exceeds the threshold value for a certain time period. | 04-10-2014 |
20140097155 | SWITCH - A rotation mechanism for a rotary switch and a method of operating a rotary switch are provided. The rotation mechanism includes a mechanism shaft for switching the switch between open and closed positions of the switch, a crank rotationally connected to the mechanism shaft, a spring connected to the crank, where the spring has a dead point between the open and closed positions of the switch, and a force transmission roll rotationally connected to the crank. The mechanism shaft, crank and force transmission roll have a common axis of rotation. There is a predetermined rotational free-play between the rotation of the mechanism shaft and the crank, and a predetermined rotational free-play between the rotation of the crank and the force transmission roll. | 04-10-2014 |
20140097154 | SWITCH - A movable contact for a rotary switch is provided. The movable contact includes first and second contacts for contacting a stationary contact, where the first and second contacts are arranged at a distance from each other for receiving the stationary contact between the first and second contacts. The first contact is a straight contact blade for contacting stationary contacts at both ends of the blade. The second contact is a spring element configured to bend when the stationary contact is placed between the first contact and the second contact, and to cause a pressing force to the stationary contact to press the stationary contact against the first contact after the stationary contact has been placed between the first contact and the second contact. | 04-10-2014 |
20140091062 | SWITCH - A roll for rotating a movable contact of a rotary switch, and a method of mounting a switch are provided. The roll includes a first slot going along the diameter of the roll and open from the top of the roll for receiving the movable contact for contacting with a stationary contact of the rotary switch, and a second slot arranged perpendicular to the first slot for receiving teeth of an upper roll to be mounted together with the roll. | 04-03-2014 |
20140090969 | SWITCH - A stationary contact for a rotary switch is provided. The stationary contact includes a connection portion for connecting to a conductor and a first portion being a contact portion for connecting the stationary contact to a rotary contact. The stationary contact also includes a second portion being a support portion for supporting the stationary contact to a switch body. The contact portion and support portion extend in the same angle from the connection portion. A method of mounting a rotary switch is also provided. | 04-03-2014 |
20140079092 | METHOD AND APPARATUS FOR PRE-EMPTIVE POWER SEMICONDUCTOR MODULE FAULT INDICATION - A method and an apparatus for an arrangement including a power semiconductor module with a cooling interface which is connected to a cooling element. The method first measures a first temperature value of the cooling interface, and then changes an operating mode of the power semiconductor module, wherein the operating mode is selected from an active mode and an inactive mode. The method then waits a determined time, measures a second temperature value of the cooling interface, and determines a temperature difference between the first temperature value and the second temperature value. The method then determines a level of a fault risk on the basis of the temperature difference. The apparatus implements the method. | 03-20-2014 |
20140063667 | ACTIVE CLAMP FOR A SEMICONDUCTOR SWITCH - Exemplary embodiments are directed to a method and arrangement for detecting an overvoltage of a semiconductor switch. The arrangement including a first semiconductor switch and a driver unit controlling the switch. An overvoltage is detected over the semiconductor switch, and a voltage is adjusted at a supply voltage input of the driver unit on the basis of the overvoltage. | 03-06-2014 |
20140049263 | AN ARRANGEMENT TO MONITOR DC CIRCUIT CONDITION - An arrangement for monitoring a condition of a direct current voltage circuit including first and second supply poles for forming an operating voltage. A first fuse is connected to the first supply pole, and has a supply pole and an output pole. A second fuse is connected to the second supply pole, and has a supply pole and an output pole. The arrangement can form one or several reference voltages (U | 02-20-2014 |
20130321021 | STARTING OF PHOTOVOLTAIC SYSTEM - A method and arrangement of determining starting conditions of a solar converter in a photovoltaic system. The photovoltaic system includes a photovoltaic panel system having one or more photovoltaic panels. The method includes determining an open circuit voltage of the photovoltaic panel system, and determining beforehand limit values for the starting conditions, where the limit values include an open circuit voltage value and a temperature value, with which values the solar converter can be started. The method also includes determining beforehand the temperature dependency of the open circuit voltage of the panel system, determining a temperature of the panel system, and setting a criterion for starting the converter. The criterion includes determining, by using the determined temperature dependency and the determined limit values for the starting conditions, whether the determined temperature and the determined open circuit voltage enable the starting of the converter. | 12-05-2013 |
20130316602 | ARRANGEMENT FOR STEERING AND SUPPLYING PROPULSION POWER TO PROPULSION SYSTEM - An arrangement for steering and supplying propulsion power to a contra rotating propeller(s) (CRP) propulsion system in a marine vessel is disclosed. The arrangement can include a first propeller, a second propeller driven by an AC motor, and an AC generator. The AC motor and AC generator can have the same electrical frequency. Another electrical power source can be electrically connectable to the AC motor in parallel to the AC generator. A shaft of the second propeller is mounted rotatable in a support structure which is attached to a hull of the marine vessel, and a rudder is supported in a manner allowing pivotal movement of the rudder relative to the support structure. | 11-28-2013 |
20130300065 | SEAL ARRANGEMENT FOR A PROPELLER SHAFT AND METHOD FOR SEALING A PROPELLER SHAFT - The present disclosure relates to sealing the propeller shaft of a ship using a sealing having a group of lip seals arranged consecutively in a direction of the propeller shaft so that a seal chamber is created between adjacent lip seals. The pressure of the first seal chamber on the propeller side can be close to the pressure of the surrounding water at the propeller shaft level, and the pressure of the second seal chamber furthest from the propeller can be adjusted to a fixed value that is lower than the pressure of the first seal chamber. The pressure of a third chamber located between the first chamber and the second chamber can be adjustable by pressure regulation devices to a value between the pressure values of the first and the second chambers by adjusting the pressure loss caused by the flow of a liquid medium. | 11-14-2013 |
20130299571 | ENCODING CONFIGURATION INFORMATION OF AN APPARATUS INTO AN OPTICAL CODE - An exemplary apparatus and method are provided in which the apparatus is provided with encoding configuration information as an optical code. The optical code is displayed on a display of the apparatus. The optical code can be read from the display and configuration information derived from the optical code is sent to a database of configured apparatuses. | 11-14-2013 |
20130297079 | METHOD FOR TUNING A VENTILATION SYSTEM - A method includes selecting the branch of a ventilation system with the greatest pressure loss, opening a control valve in the selected branch and closing control valves in all other branches, controlling a fan to produce the desired air flow rate into the selected branch by using fan characteristic shaft power to air flow rate curves, and a shaft power estimate from the frequency converter and by adjusting the rotational speed of an electric motor to achieve the desired air flow rate, calculating the fan pressure corresponding to the desired air flow rate from fan characteristic fan pressure to air flow rate curves, saving the calculated fan pressure as a reference pressure, and adjusting the control valves in each of the remaining branches so that the desired air flow rate to each branch is delivered while the fan is controlled by the frequency converter to produce the reference pressure. | 11-07-2013 |
20130294027 | ELECTRONICS COMPARTMENT - An electronics compartment with a component space which is sealed off from a surrounding environment by walls, including an internal panel arranged in the component space along a wall of the electronics compartment for delimiting an internal channel between the wall and the internal panel. Air flowing in the internal channel can improve transfer of heat through the wall, and consequently, cools electric components in the component space. | 11-07-2013 |
20130294026 | ELECTRONICS COMPARTMENT - An electronics compartment is disclosed with a component space which is sealed off from a surrounding environment by walls. An internal panel is arranged in the component space along a wall of the electronics compartment for delimiting an internal channel between the wall and the internal panel. An external panel is arranged along a same wall of the electronics compartment as the internal panel, but outside the component space for delimiting an external channel between the wall and the external panel. Air flowing in the internal channel and external channel can improve heat transfer through the wall, and cool electric components in the component space. | 11-07-2013 |
20130293003 | PROPULSION SYSTEM - An arrangement is disclosed for supplying electric power to a propulsion system of a marine vessel having a propeller motor, which is connected to an AC generator. The AC generator supplies electric energy to the propeller motor. The AC generator is rotated by a rotating power unit. A frequency converter is electrically connectable in parallel to the AC generator and the frequency converter supplies electric power from a second power unit. | 11-07-2013 |
20130264876 | INVERTER ASSEMBLY AND SOLAR POWER PLANT COMPRISING THE SAME - An inverter assembly having a DC circuit, inverter, and controller (CTRL) configured to control the inverter, the inverter being, for example, a multilevel inverter having a first half bridge (HB | 10-10-2013 |
20130258598 | ELECTRIC APPARATUS - The disclosure relates to an electric apparatus including an electric device which, during use, generates heat, and a housing enclosing the electric device from the surrounding environment. In order to avoid problems caused by water, the electric apparatus including a receptacle for containing a desiccant. The receptacle has an opening allowing gas to flow between an interior of the receptacle and an interior of the housing in order for the desiccant to come into contact with moisture in the housing, and the receptacle is thermally connected to the electric device for transferring heat from the electric device to the desiccant for removing moisture from the desiccant. | 10-03-2013 |
20130257405 | ADD-ON BOOST CONVERTER FOR A SOLAR ENERGY SYSTEM - Exemplary embodiments are directed to a boost converter module for a solar energy system. The boost converter module includes input poles, output poles, and a boost converter unit connected between the input poles and the output poles. The input poles can be adapted for connection to a photovoltaic device feeding an input direct voltage (DC | 10-03-2013 |
20130253850 | HEALTH MONITORING METHOD AND SYSTEM FOR DRIVES - In an exemplary method for condition monitoring of electric and mechanical drives, measurement data in a condition monitoring system of electric drives is collected at least from one electric drive. The measurement data is pre-treated, a frequency spectrum is created from the pre-treated measurement data with the Fast Fourier Transform transformation, and a detected vibration frequency and vibration amplitude are recorded from the frequency spectrum. The detected vibration frequency and vibration amplitude is compared to at least one detected vibration frequency and vibration amplitude successive in time. In the comparison, detrimental changes in vibration frequency and vibration amplitude are defined, and the detrimental changes are indicated. | 09-26-2013 |
20130248139 | ANTICIPATORY FAILURE INDICATOR AND FLUID COOLING ARRANGEMENT - A simple and reliable anticipatory failure indicator is provided for fluid circulation piping, and a fluid cooling arrangement including such an indicator is provided. The indicator includes a first sacrificial member, which is designed to be in direct contact with the fluid within the piping and designed to be weaker than the piping. The indicator includes a chamber, which is isolated from the fluid circulation at least partly by means of the first sacrificial member. The indicator includes an electrical response member, which is arranged into the chamber and which is configured to produce an electrical response upon exposure to the fluid, which has entered to the chamber via a failed sacrificial member. Accordingly, the indicator is configured to provide an electrical response as a direct indication of a failed sacrificial member and as an anticipatory indication of failed piping. | 09-26-2013 |
20130217316 | ENCLOSURE FOR HOUSING ELECTRICAL EQUIPMENT - An enclosure for housing electrical equipment includes a bottom part, a wall part and a roof part. The bottom part, the wall part and the roof part define an interior chamber for housing the electrical equipment. The wall part includes at least one first air channel connected to the interior chamber, and the enclosure includes at least one fan for circulating air from inside the interior chamber through the at least one first air channel. The bottom part includes at least one second air channel connected to the interior chamber, and the enclosure includes at least one fan for circulating the air from inside the interior chamber through the at least one second air channel. | 08-22-2013 |
20130206370 | ELECTRONIC APPARATUS - An electronic apparatus includes an extruded metallic frame with walls which are integrated parts of the extruded metallic frame, at least one extruded flow channel in at least one of the walls for passing a cooling fluid within the respective wall, an inlet arranged outside the electronic apparatus and an outlet arranged outside the electronic apparatus for providing a flow path via the at least one extruded flow channel, and detachable covers which are attached to the walls for sealing off at least one electric component space from an outside of the electronic apparatus. | 08-15-2013 |
20130197834 | METHOD AND ARRANGEMENT IN CONNECTION WITH PHOTOVOLTAIC POWER GENERATOR COMPOSED OF SERIES-CONNECTED PHOTOVOLTAIC MODULES - A method and an arrangement are provided in connection with a photovoltaic power generator composed of series-connected photovoltaic modules. The method includes determining a maximum power point voltage (U | 08-01-2013 |
20130197826 | METHOD AND APPARATUS FOR MONITORING AIR FILTER CONDITION - A method and apparatus are disclosed for monitoring accumulation of dirt on an air filter of a ventilation system including the filter and a fan controlled by a frequency converter. An initial value for an operating parameter is determined. A present operating point is determined based on a characteristic curves, and the mechanical power and rotational speed of the fan. A present value for the operating parameter is determined based on the present operating point, and accumulation of dirt is determined on the air filter based on the initial and present values of the operating parameter. | 08-01-2013 |
20130185002 | METHOD FOR DETECTING THE CORRECT ROTATIONAL DIRECTION OF A CENTRIFUGAL APPARATUS, AND A CENTRIFUGAL APPARATUS ASSEMBLY - A method is provided for detecting the correct rotational direction of a centrifugal apparatus. The method includes rotating the centrifugal apparatus in a first direction, acquiring first frequency data relating to the step of rotating the centrifugal apparatus in the first direction, rotating the centrifugal apparatus in a second direction, which is opposite to the first direction, and acquiring second frequency data relating to the step of rotating the centrifugal apparatus in the second direction. The method also includes detecting the correct rotational direction of the centrifugal apparatus based on comparing the first frequency data with the second frequency data, the comparison being carried out with respect to at least one significant frequency range. In each of the at least one significant frequency range, a smaller magnitude is interpreted as an indication of the correct rotational direction. | 07-18-2013 |
20130174735 | APPARATUS AND METHOD FOR REMOVING DIRT FROM GAS FLOW - The disclosure relates to a gas permeable wall for preventing dirt present in a gas flow from passing through the gas permeable wall with the gas flow. In order to minimize maintenance, the gas permeable wall is a circumferential wall of a cover, and an outlet from the cover is provided for passing on gas having entered the cover through the circumferential gas permeable wall. A support is provided for attaching the cover rotatably to a device, and a drive unit is provided for rotating the cover. | 07-11-2013 |
20130164146 | METHOD AND APPARATUS FOR OPTIMIZING ENERGY EFFICIENCY OF PUMPING SYSTEM - A method and apparatus for optimizing energy efficiency of a pumping system includes at least one pump that controls a fluid level in a reservoir. The method includes a system identification stage and an energy efficiency optimization stage. The system identification stage includes determining pump characteristics for the pump, operating the pump with a range of flow rate conditions, determining a set of data points, and calculating energy efficiency optimization characteristics. The energy efficiency optimization stage includes determining a present static head value, choosing a value for a pump control parameter, and operating the pump on the pump control parameter. | 06-27-2013 |
20130146701 | METHOD AND APPARATUS FOR ACCELERATING A ROLL TO A TARGET - Method and apparatus of splicing a paper web, in which a paper web from a new reel is spliced to a paper web from an emptying reel and a position of glue or two sided tape in the surface of the new paper reel is marked. The method includes receiving a command for splicing, determining the splicing time instant, accelerating a rotation of the new paper reel, detecting the glue or tape, controlling, based on the detected glue or tape, the rotation of the new paper reel in such a manner that the rotation speed of the new paper reel and the position of the glue or tape are as required at the splicing time instant, and splicing the paper web at the splicing time instant. | 06-13-2013 |
20130134808 | STATOR AND ASSEMBLY METHOD - An exemplary stator disk of an electric motor stator includes a set of recesses. Each recess being configured to receive a cooling pipe. The stator disk includes one or more positioning elements for aligning the stator disk with another stator disk. The one or more positioning elements being positioned to the stator disk such that when the stator disk is set to a rotated position with respect to the other stator disk in order to align the recesses of the disks for receiving of cooling pipes, the positioning elements of the two disks become only partly aligned with each other. | 05-30-2013 |
20130129481 | METHOD FOR DETECTING THE CORRECT ROTATIONAL DIRECTION OF A CENTRIFUGAL APPARATUS, AND A CENTRIFUGAL APPARATUS ASSEMBLY - A method is disclosed for detecting the correct rotational direction of a centrifugal apparatus. The method can include detecting the correct rotational direction of the centrifugal apparatus based on an acceleration test and/or a deceleration test. The detecting of correct rotational direction of the centrifugal apparatus can include comparing an acceleration time (t | 05-23-2013 |
20130128454 | METHOD AND ARRANGEMENT FOR REDUCING THE AMOUNT OF CONDENSED MOISTURE INSIDE AN ENCLOSURE FOR ELECTRICAL EQUIPMENT - A method and arrangement are provided for reducing the amount of condensed moisture inside an enclosure which encloses at least one piece of electrical equipment which is configured to receive electric power from outside the enclosure in a first electrical magnitude range (0 . . . max | 05-23-2013 |
20130121757 | CAPACITOR FASTENING - A capacitor fastening for fastening a capacitor to a panel, whereby the capacitor, when mounted in place, is positioned in the panel, fastened at its lower part. The capacitor fastening includes a retainer in the panel at the mounting point of the capacitor for preventing lateral movement of the capacitor in at least one selected direction; a tightening plate arranged above the panel and to be fastened to the panel, which tightening plate has a hole substantially corresponding to the diameter of the capacitor above the mounting point of the panel; and a wedge between the panel and the tightening plate for tightening the retainer of the panel and the edge of the hole in the tightening plate from opposite directions against the capacitor. | 05-16-2013 |
20130108473 | METHOD AND CONTROLLER FOR OPERATING A PUMP SYSTEM | 05-02-2013 |
20130106335 | MOTOR DRIVE AND A METHOD OF CONFIGURING A MOTOR DRIVE | 05-02-2013 |
20130076316 | METHOD AND ARRANGEMENT IN CONNECTION WITH A CASCADE-FED ASYNCHRONOUS GENERATOR - A method and apparatus are provided for controlling a cascade-fed asynchronous generator in connection with a voltage dip of a network fed by the generator. A frequency converter is connected between the rotor of the asynchronous generator and the network. The method includes measuring the magnitude of the voltage in the network, calculating, on the basis of the voltage in the network, a base value for reactive current to be fed to the network, generating reactive current in the network by the generator, measuring the stator current, determining the actual value of the reactive current in the network, calculating the difference between the base value and the actual value of the reactive current, providing the calculated difference to the frequency converter to serve as an instruction in reactive current, and generating reactive current in the network by the frequency converter in accordance with the instruction in reactive current. | 03-28-2013 |
20130076190 | WINDING FOR AN AC MACHINE - A stator winding is disclosed for a multiple-phase alternating current machine with several parallel winding groups (U1, V1, W1; U2, V2, W2; U3, V3, W3), each of which can be supplied with separate power sources. Locations of the winding groups can be cyclically shifted when moving from one pole to another. The number of parallel winding groups (U1, V1, W1; U2, V2 ,W2 ;U3 ,V3 , W3) can be higher than two, and the number of poles of the alternating current machine can be an even figure that is a multiple of the number of winding groups. | 03-28-2013 |
20130009610 | CONTROL SYSTEM FOR DOUBLY-FED INDUCTION MACHINE - A method and arrangement for controlling a doubly-fed induction machine by a frequency converter including a rotor side converter (INU) connected to a rotor circuit of a doubly-fed induction machine (DFIG) and having a control system with rotor flux as a feedback variable, a grid side converter (ISU) connected to an AC power network, and a direct voltage intermediate circuit (DC) connected between the rotor side converter (INU) and the grid side converter (ISU). The method includes forming a rotor flux reference (ψ | 01-10-2013 |
20130009496 | ARRANGEMENT AND METHOD FOR COOLING AN ELECTRICAL MACHINE - In an arrangement for cooling an electrical machine, the electrical machine includes a rotor and a stator located at the end of an air gap from the rotor. The rotor includes at least one axial cooling channel originating from the first end of the rotor that is connected to at least two axially successive cooling channels that are substantially radial within the rotor. The stator is made of sheets using axially successive core modules. The stator includes a radial cooling channel between two core modules. Gaseous cooling agent is led to the cooling channels of the rotor and stator from the end of the rotor. The outer surface of the stator core module includes a cooling jacket by the length (L) of the stator core module at maximum, and liquid cooling agent is led to the cooling jacket. | 01-10-2013 |
20120320647 | SWITCHING BRANCH FOR THREE-LEVEL RECTIFIER, AND THREE-PHASE THREE-LEVEL RECTIFIER - An exemplary switching branch for a three-level rectifier includes a first diode and a first semiconductor switch connected in series between a positive direct voltage pole and a neutral direct voltage pole, a second diode and a second semiconductor switch connected in series between a negative direct voltage pole and the neutral direct voltage pole as well as a thyristor and a third diode connected in series between a connection point between the first diode and the first semiconductor switch and a connection point between the second diode and the second semiconductor switch in such a manner that a connection point between the thyristor and the third diode is connected to an alternating voltage pole of the switching branch. | 12-20-2012 |
20120319524 | METHOD FOR MANUFACTURING WINDING COIL FOR AN ELECTRICAL MACHINE - A method is disclosed for manufacturing the winding coil of an electrical machine from flat wire. The coil can include coil sides fitted to a groove of an electrical machine and end sections which are left outside the groove and form a coil end. Flat wire can be used for winding a spool in which the coil rounds are in the same winding plane and in which there are two parallel straight coil sides on opposite sides. After this, the parallel straight coil sides can be bent towards each other essentially to the right angle in comparison to the winding plane. | 12-20-2012 |
20120300525 | CONVERTER ARRANGEMENT AND METHOD IN CONNECTION WITH CONVERTER ARRANGEMENT - An exemplary converter arrangement and method in connection with the arrangement includes a converter arranged in a closed container or similar structure. The container has a high voltage compartment and a low voltage compartment. The high voltage compartment includes a transformer connectable to a network to be supplied and the low voltage compartment includes the converter. The arrangement being configured to exchange heat from the high voltage compartment to the low voltage compartment and heating the low voltage compartment with losses of the transformer. | 11-29-2012 |
20120293038 | ROTOR DISK AND ASSEMBLY METHOD - A rotor disk for an electric motor including a shaft hole for receiving a shaft of the electric motor, a set of positioning holes around the shaft hole, each configured to receive a positioning pin. The shaft hole and the set of positioning holes are positioned in the rotor disk such that when the rotor disk is set to a rotated position with respect to another similar rotor disk, and the shaft and the positioning pins are penetrated to the respective holes of the two rotor disks, the disks cause a pressing force to the shaft. | 11-22-2012 |
20120287683 | METHOD AND APPARATUS FOR CONTROLLING ELECTRIC GRID IN ISLANDING MODE - An exemplary method for controlling transfer of electrical power in island mode in an arrangement having a converter and a load connected to the converter through a filter. The method including determining voltage reference components for one or more frequency components of an output voltage of the converter. An effect of a load current is compensated for by forming one or more voltage feedforward terms based on the load current and using the feedforward terms to adjust the voltage reference components. Control reference components for one or more of the frequency components are formed based on the voltage reference components, and a control reference is formed based on the control reference components. The output voltage of the converter is controlled based on the control reference. | 11-15-2012 |
20120287577 | LIQUID COOLING ELEMENT - A cooling element for cooling a plurality of power semiconductor modules including power semiconductor units including a plate made of thermally conductive material. The plate includes channels for carrying a flow of a cooling liquid. The channels include a main supply channel converging in a direction of the flow of the liquid, a main discharge channel diverging in the direction of the flow of the liquid, a plurality of supply channel branches branching from the main input channel, a plurality of discharge channel branches merging to the main discharge channel, and a plurality of power semiconductor unit cooling channels connecting the supply channel branches and the discharge channel branches. Each power semiconductor unit cooling channel is arranged to cool one power semiconductor unit. The plate includes openings for thermally separating the power semiconductor modules from each other. | 11-15-2012 |
20120274166 | PERMANENT-MAGNET SYNCHRONOUS MACHINE AND A METHOD FOR MANUFACTURING AND INSTALLING IT - An exemplary permanent-magnet synchronous machine is disclosed with a stator and a rotor located at the distance of the air gap (δ1) from the stator. The rotor is supported on the shaft in a rotating arrangement, and a maximum value has been determined for the eccentricity between the stator and the rotor. The value is higher than one-tenth of the air gap. The magnetization of the synchronous machine is arranged with permanent magnets fitted in the rotor for creating a magnetic flux (φ) which is closed via the stator, the air gap (δ1), and the rotor. A relation H≧(10*ε−δ)*μ | 11-01-2012 |
20120257338 | FREQUENCY CONVERTER UNIT - A frequency converter unit includes a unit body, input bus bar means and output bus bar means. The input bus bar means have a plurality of input side bus bars spaced apart in a first direction, and the output bus bar means have a plurality of output side bus bars spaced apart in the first direction, which is perpendicular to an installation direction of the frequency converter unit. Each of the plurality of input side bus bars and the plurality of output side bus bars includes an aperture configured to connect the bus bar to a counterpart contact in a frame with a bolt-nut connection. | 10-11-2012 |
20120253700 | STALL DETECTION IN FANS UTILIZING FREQUENCY CONVERTER - Exemplary methods and systems of determining stall of a fan are disclosed, when the fan is controlled with a frequency converter. The method includes estimating a rotational speed (n) and the torque (T) of the fan. Transferring characteristic curves of the fan to the estimated rotational speed (n) of the fan, determining the stall region of the fan. Determining an operation point of the fan from the estimated rotational speed (n) and estimated torque (T) using the characteristic curves. Calculating RMS values of the low frequency components of the torque and rotational speed estimates (T | 10-04-2012 |
20120251340 | METHOD FOR IMPROVING SENSORLESS FLOW RATE ESTIMATION ACCURACY OF PUMP DRIVEN WITH FREQUENCY CONVERTER - An exemplary method for determining a flow rate of a pump, includes measuring and storing the flow rate (Q | 10-04-2012 |
20120251292 | METHOD AND ARRANGEMENT FOR ESTIMATING FLOW RATE OF PUMP - A method and arrangement for determining the flow rate (Q) produced by a pump, when the pump is controlled with a frequency converter, which produces estimates for rotational speed and torque of the pump, and the characteristic curves of the pump are known. The method includes determining the shape of a QH curve of the pump, dividing the QH curve into two or more regions depending on the shape of the QH curve, determining on which region of the QH curve the pump is operating, and determining the flow rate (Q) of the pump using the determined operating region of the characteristic curve. | 10-04-2012 |
20120247200 | METHOD OF DETECTING WEAR IN A PUMP DRIVEN WITH A FREQUENCY CONVERTER - A method and an arrangement for detecting wear of a pump are disclosed, which pump is controlled with a frequency converter providing rotational speed and torque estimates, characteristic curves of the pump being known. An exemplary method includes obtaining a value representing the operating point of the pump by measuring the flow (Q | 10-04-2012 |
20120223744 | CONTROL OF SEMICONDUCTOR COMPONENT - An exemplary method and a control circuit are disclosed for controlling a power semiconductor component by producing a control signal (Ucin) for controlling the component, forming a second control signal (Ucout) in the potential of the controlled component from the control signal (Ucin), measuring a current flowing through the component, and comparing the measured current with a set limit. A fault signal (Ufault) having a logical state is provided on the basis of the comparison between the measured current and the set limit, producing a component control signal (Uave) from the fault signal (Ufault) and the second control signal (Ucout). If a fault is indicated, the component control signal has a value between high and low states, and otherwise the state of the component control signal (Uave) equals the state of the second control signal (Ucout). | 09-06-2012 |
20120217848 | END SHIELD FOR AN ELECTRICAL MACHINE - In an arrangement in an electrical machine, the electrical machine includes a rotor rotating around its shaft, a stator located from the rotor at an air gap, and a frame around the outer surface of the stator. A stator opening is formed in the end of the frame, and the stator opening is closeable with a cast end shield. The end shield includes at least three brackets protruding from the outer edge of the end shield. The brackets are fittable onto the end junctions where axially continuing structures are connected to the end at the junctions. | 08-30-2012 |
20120212215 | METHOD AND APPARATUS FOR ESTIMATING ROTOR ANGLE OF SYNCHRONOUS RELUCTANCE MOTOR - Exemplary embodiments are directed to estimating a rotor angle of a synchronous reluctance motor. The motor has a stator and a rotor. A stator flux and a stator current are determined. Two orthogonal stator flux components in a stator reference frame are calculated from the stator flux. Two orthogonal stator current components in the stator reference frame are calculated from the stator current. Two rotor orientation vectors are then calculated using a known rotor direct and quadrature axis inductance components, the stator flux components, and the stator current components. A rotor angle is estimated based on the rotor orientation vectors. | 08-23-2012 |
20120212165 | METHOD AND APPARATUS FOR ESTIMATING ROTOR ANGLE AND ROTOR SPEED OF SYNCHRONOUS RELUCTANCE MOTOR AT START-UP - A method of estimating a rotor angle of a synchronous reluctance motor, which includes a stator and a rotor. First, a stator flux and a stator current are determined. Two orthogonal stator flux components in a stator reference frame are calculated from the stator flux. Two orthogonal stator current components in the stator reference frame are calculated from the stator current. A rotor orientation vector is then calculated using a known rotor direct or quadrature axis inductance component, the stator flux components, and the stator current components. The rotor orientation is estimated on the basis of the rotor orientation vector. | 08-23-2012 |
20120192921 | METHOD AND AN ARRANGEMENT IN CONNECTION WITH A SOLAR ENERGY SYSTEM - An arrangement and a method are provided in connection with a solar energy system. The arrangement includes solar panels and a converter for converting the DC voltage from the solar panels. The converter is arranged inside a container or a similar closed structure. The arrangement includes means for producing heat from the energy produced by the solar panels. The means are arranged inside the container or a similar closed structure and are electrically connectable to the solar panels. | 08-02-2012 |
20120139346 | AC CONVERSION OF VARYING VOLTAGE DC SUCH AS SOLAR POWER - An alternating current conversion method and system are disclosed that can adapt to varying voltages of the direct current sources. An exemplary system includes a first and second connection arrangements for the voltage sources such that the direct current can be supplied to the DC/AC converter selectively in the first connection arrangement or the second connection arrangement. The selection between the first and second connection arrangements is made on the basis of the voltage levels of the voltage sources such that a proper voltage is supplied to the DC/AC converter. The numbers of the voltage sources in the connection arrangements are selected such that the first and second connection arrangements have different numbers of the voltage sources connected in series, the voltage sources being also grouped in parallel groups. | 06-07-2012 |
20120133233 | ARRANGEMENT FOR ATTACHING A MAGNET TO A ROTOR, AND A ROTOR - An arrangement for attaching a permanent magnet to the rotor of an electrical machine and such a rotor are provided. The rotor is assembled of sheets and includes at least two magnetic poles and a magnetic core. Permanent magnets are installable on a surface of the magnetic core, and a pole piece assembled of sheets is installable on a side of the permanent magnet that faces an air gap. At least one channel passing through the pole piece is built in the pole piece and magnetic core. A tightening strip is installable in the channel. The tightening strip is attachable to the pole piece using locking parts, and an end of the tightening strip facing the magnetic core includes fixing parts for attaching the tightening strip to the magnetic core. | 05-31-2012 |
20120126049 | METHOD AND ARRANGEMENT IN CONNECTION WITH WINDER DRIVE - A method and arrangement are provided in connection with a continuous material web, which runs from an unwinder to a winder, at least one of which being a center winder. The method includes providing an initial value for density of a material on the center winder, calculating a moment of inertia for a roll of material on the center winder, determining tightness of the material web, producing a correction term for torque calculation based on a material web tightness reference, the material web tightness and the moment of inertia of the roll of material, calculating a torque reference based on the produced correction term and the calculated moment of inertia of the roll of material, and controlling the torque of the center winder based on the torque reference. The method also includes correcting the density value of the material on the center winder based on the produced correction term. | 05-24-2012 |
20120123715 | METHOD AND ARRANGEMENT FOR DETERMINING INDUCTANCES OF SYNCHRONOUS RELUCTANCE MACHINE - A method and an arrangement of determining inductances of a synchronous reluctance machine are provided. The method includes supplying a voltage pulse in the quadrature-axis or direct-axis direction of rotor, sampling currents generated by the supplied voltage pulse, and calculating values of flux at the sampling instants from the value of the supplied voltage pulse, the sampled current values and a value of the stator resistance. The method also includes calculating synchronous inductance of the machine by dividing the calculated flux values by the corresponding sampled currents, and/or calculating transient inductance of the machine as a derivative of the flux with respect to current, and storing the calculated values as a function of current. | 05-17-2012 |
20120120698 | SWITCHING BRANCH FOR THREE-LEVEL CONVERTER AND METHOD FOR CONTROLLING SWITCHING BRANCH OF THREE-LEVEL CONVERTER - Exemplary embodiments for controlling a switching branch for a three-level converter, and a switching branch are disclosed. A first semiconductor switch and a second semiconductor switch, a first diode and a second diode, a third semiconductor switch and a fourth semiconductor switch, a third diode, and a fourth diode, a fifth semiconductor switch and a sixth semiconductor switch, a fifth diode, and a sixth diode, and a control arrangement for controlling the semiconductor switches are provided. The first semiconductor switch, the first diode, the fifth semiconductor switch and the fifth diode reside in a first switching branch-specific semiconductor module, and the fourth semiconductor switch, the fourth diode, the sixth semiconductor switch and the sixth diode reside in a second switching branch-specific semiconductor module. | 05-17-2012 |
20120119712 | CONTROL METHOD FOR DOUBLY-FED ELECTRIC GENERATOR - Exemplary embodiments provide a method of controlling a doubly-fed electric generator using a frequency converter having a torque and flux controller. The frequency converter is connected to a rotor of the generator. The frequency converter calculates a stator flux positive sequence component from a stator flux. A rotor flux amplitude reference and an estimated torque is then calculated by using the stator flux positive sequence component. The frequency converter selects a voltage vector to steer the rotor flux by using the rotor flux amplitude reference and the estimated torque. | 05-17-2012 |
20120099347 | FREQUENCY CONVERTER ASSEMBLY - A frequency converter assembly including an input for supplying electric power having an input frequency into the frequency converter assembly from a supply network, a direct voltage intermediate circuit having capacitor component, and at least one controllable switch. The switch being electrically positioned between the input and the direct voltage intermediate circuit. The assembly also includes an output for supplying electric power having an output frequency from the frequency converter assembly, and control component arranged to control the at least one controllable switch. The control component provides a recovery function to recover the capacitor component by supplying restricted recovery current from the supply network to the capacitor component through the at least one controllable switch, the control means also prevents supply of electric power from the direct voltage intermediate circuit towards the output during the recovery function. | 04-26-2012 |
20120098377 | ARRANGEMENT FOR ATTACHING A MAGNET TO A ROTOR, AND A ROTOR - In an arrangement in accordance with the invention for attaching a permanent magnet to an electrical machine's rotor, the rotor comprises at least two magnetic poles, and there is a pole gap between two magnetic poles. Permanent magnets are installable on the surface of the magnetic core. A pole piece is installable on the permanent magnet side facing the air gap. There is fixing means on the sides of the pole piece facing the pole gap for attaching the pole piece to the rotor using the locking parts, and the fixing means are connected to the pole piece through an articulated joint. | 04-26-2012 |
20120092914 | SWITCHING BRANCH FOR THREE-LEVEL RECTIFIER AND METHOD FOR CONTROLLING SWITCHING BRANCH FOR THREE-LEVEL RECTIFIER - A switching branch for a three-level rectifier and a method for controlling a switching branch for a three-level rectifier are provided. The switching branch includes a first diode and a second diode connected in series, a third diode and a fourth diode connected in series, a first controllable switch connected between a neutral DC output pole and a connection point between the first and the second diode, and a second controllable switch connected between the neutral DC output pole and a connection point between the third and the fourth diode. The switching branch includes means for controlling the first controllable switch to be in a conductive state during a reverse blocking state of the first diode and the second diode, and means for controlling the second controllable switch to be in a conductive state during a reverse blocking state of the third diode and the fourth diode. | 04-19-2012 |
20120086289 | ROTOR OF A SYNCHRONOUS RELUCTANCE MACHINE AND THE METHOD FOR MANUFACTURING THE ROTOR OF A SYNCHRONOUS RELUCTANCE MACHINE - A rotor is disclosed for a synchronous reluctance machine which includes an axis, which is supported by bearings to rotate inside a stator, and to which axis a rotor frame has been attached. The frame can be made of magnetically non-conductive material, having arranged magnetically conductive bar-shaped objects which extend through the rotor frame from the outer surface of the magnetic pole of the rotor to the outer surface of the pole. The whole length of each bar-shaped object inside the rotor frame can be surrounded by non-magnetic material. | 04-12-2012 |
20120072868 | FREQUENCY CONVERTER WITH TEXT EDITOR - A frequency converter includes a symbol string editor in which the potential input symbols are grouped into at least two symbol lists. One of the lists is treated as a current symbol list, which can be scrolled and from which the symbols can be selected as the user input. In addition, a user is allowed to control change of the current symbol list such that the symbols in all of the symbol lists are available for selection. This arrangement allows for scrollable lists to be significantly shorter than a single list of potential symbols would be, which makes entering symbol strings faster. | 03-22-2012 |
20120044730 | LINE AND NEUTRAL POINT CLAMPED INVERTER - Exemplary embodiments are directed to an inverter and a method for controlling an inverter. The inverter includes a DC link having two capacitor units in series and a neutral point between the capacitor units, and a first and a second inverter leg. Both inverter legs are connected between the poles of the DC link and include four switching devices connected in series. Both inverter legs include an upper connection point between the two topmost switching devices, a lower connection point between the two bottommost switching devices, and an output between the two middle switching devices. Both inverter legs further include a first rectifier device connected between the DC link neutral point and the leg upper connection point, and a second rectifier device connected between the DC link neutral point and the leg lower connection point. Both inverter legs further include a third rectifier device connected between the upper connection point of the leg and the output of the other leg, and a fourth rectifier device connected between the output of the leg and the lower connection point of the other leg. | 02-23-2012 |
20120044717 | TRANSFORMER-ISOLATED SWITCHING CONVERTER - Exemplary systems and methods provide a transformer-isolated current-fed quadratic full-bridge converter topology. The optimal interfacing of a current source, such as a solar panel, can be implemented by using current-fed converters. The current-fed converter can operate within the whole range of a UI curve from short-circuit to open-circuit condition and its input voltage can be readily controlled. The quadratic behaviour between input and output in regard of a duty cycle allows large conversion ratios. | 02-23-2012 |
20120029844 | DETERMINING ELASTIC MODULUS FOR CONTINUOUS MATERIAL WEB - A method and apparatus are disclosed for determining elastic modulus for a continuous material web, in which method a continuous material web runs on a roll driven by an electric motor drive. The method includes determining material web speed v | 02-02-2012 |
20120008356 | CURRENT-FED CONVERTER - A converter circuit includes first and second input terminals for receiving input current from a current source, a first capacitor connected between the first and second input terminals, a second capacitor having a first terminal of which is connected to the second input terminal and a second terminal which forms a positive voltage node, and first and third semiconductor components connected in series between the first input terminal and a positive voltage node, where the midpoint between the series connection forms a first node. The converter circuit includes first inductive component connected between the second input terminal and first node, second and fourth semiconductor components connected in series in parallel with the series connection first and third semiconductor components, a second inductive component having a first end which is connected to a second node formed between the second and fourth semiconductor components and a second end which produces a first output terminal, where the second output terminal is formed of the first input terminal. The first and the third semiconductor components are configured to control the voltage between the first and second input terminals. | 01-12-2012 |
20120007576 | CURRENT-FED CONVERTER - A converter circuit includes first and second input terminals for receiving an input current from a current source, a first capacitor connected between the first and second input terminals, a second capacitor having a first terminal which is connected to the second input terminal and a second terminal forming a positive voltage node. First and third semiconductor components are connected in series between the first input terminal and the positive voltage node to form a first node. A series connection of a first inductive component, a first diode and a second inductive component is connected between the second input terminal and the first node. A third capacitor and a third inductive component are included, as are first and second output terminals. The first and the third semiconductor components are configured to control the voltage between the first and second input terminals. | 01-12-2012 |
20120001508 | PERMANENT MAGNET ELECTRIC MACHINE AND PERMANENT MAGNET FOR AN ELECTRIC MACHINE - The disclosure relates to an electric machine with a permanent magnet rotor, where permanent magnets have been fitted on an outer surface of a cylindrical rotor, and relates to a permanent magnet. The permanent magnets forming the electric machine's rotor pole are shaped so that the electric machine's air gap is substantially constant in a middle of the pole, and the air gap increases in an essentially straightforward manner when moving towards the edge of the pole. The permanent magnet is of an even thickness in the middle, and becomes thinner towards the edges. This can result in a decrease in the torque ripple and cogging torque of an electric machine. | 01-05-2012 |
20110320073 | METHOD AND ARRANGEMENT FOR CONTROLLING ENERGY CONSUMPTION IN A MARINE VESSEL - An apparatus and a method are disclosed for controlling energy consumption in a marine vessel having a plurality of energy consuming users and fuel consuming engines. An exemplary apparatus includes a voyage management tool for planning a route for the marine vessel and for estimating energy consumption on the route; an energy management tool for predicting energy consumption; and control tool for managing an energy balance on the route. | 12-29-2011 |
20110298470 | DETECTION OF WELDED SWITCH CONTACTS IN A LINE CONVERTER SYSTEM - A system for the detection of welded contacts in a circuit of a line converter system has a plurality of inverter switches, a plurality of utility switches in which a pair of utility switches is connected in series through a line to a utility, a voltage detector, an electronic controller, and a DC input source. The line converter system converts incoming DC power into AC output power that is delivered to the utility grid. The voltage detector measures the voltage across a first node and a second node of the circuit and provides an output that is interpreted by an electronic controller for each step performed during a method of detection of welded contacts. The detection method has a sequence of test steps in which at least one switch is opened and/or closed, a DC bus of the inverter or the utility grid is used as a stimulus voltage, and the voltage is measured. If a voltage is not detected across the first and second nodes, the test sequence is continued until a welded contact is detected or the electronic controller determines that none of the contacts are welded. If the controller determines that none of the contacts are welded, the line converter system is permitted to connect and supply AC power to the utility. | 12-08-2011 |
20110298282 | METHOD AND ARRANGEMENT FOR BALANCING VOLTAGES OF SERIES CONNECTION OF STORAGE UNITS FOR ELECTRICAL ENERGY - An arrangement which includes two or more energy storage units for electrical energy connected in series, and two or more balancing resistor units. Each balancing resistor unit is connected in parallel with one of the energy storage units. The arrangement also includes means for determining a voltage over all of the series-connected energy storage units and means for determining the energy storage unit voltages between poles of the energy storage units. One or more of the balancing resistor units include a base resistor unit and a control resistor unit connected in series and a switching device connected in parallel with the control resistor units. The arrangement further comprises means for determining reference voltages for the energy storage units based on the voltage over all of the series-connected capacitors and means for controlling the switching device to control the resistance of one or more of the balancing resistor units so that the energy storage unit voltage of each energy storage unit is maintained within a set range of the reference voltage for each energy storage unit. | 12-08-2011 |
20110276279 | FAULT DIAGNOSTICS ARRANGEMENT FOR ELECTRIC DRIVE SYSTEM, AND ELECTRIC DRIVE SYSTEM - An exemplary electric drive system has a plural number of electric drive subsystems. Each subsystem having a fault diagnostics arrangement, where the arrangement includes a respective control board for each subsystem. Event data of each subsystem is recorded on the respective control board, and one of the respective control boards of the electric drive system is a main control board of the electric drive system. Event data of a subsystem is transferred from the respective control board to the main control board through a data transfer medium. | 11-10-2011 |
20110272319 | OUTDOOR ENCLOSURE FOR ELECTRONIC EQUIPMENT AND METHOD FOR PROVIDING AN OUTDOOR ENCLOSURE FOR ELECTRONIC EQUIPMENT - An enclosure and method for arranging an enclosure provides a robust and inexpensive enclosure for protection against gun fire and high temperature variations, in which method an enclosure having an inner shell and an outer shell en-closing the inner shell at a clearance thereof is formed, whereby a cavity is formed between the shells. Electrical equipment can be enclosed within the inner shell. Natural granular absorption material can be provided as the protective layer into the cavity on site upon installation of the enclosure. | 11-10-2011 |
20110271891 | MOORING WINCH AND A METHOD FOR CONTROLLING A CABLE OF A MOORING WINCH - An electrically driven mooring winch is provided. The mooring winch includes a winding drum, an AC motor configured to drive the winding drum, a frequency conversion unit connected to the AC motor, and a control unit configured to control the frequency conversion unit on the basis of an indicator for tension of the mooring rope. The control unit is configured to set a reference value of rotational speed of the AC motor to a predetermined value, drive the AC motor in one direction for a predetermined time interval, define a first value of a torque of the AC motor, drive the AC motor in an opposite direction for the predetermined interval, define a second value of the torque of the AC motor, and compute a torque estimate using the first and second values of the torque. | 11-10-2011 |
20110265975 | MOUNTING BASE - The disclosure relates to a mounting base for an electric component, including, for example, first surface for receiving the electric component, and for receiving a heat load generated by the electric component, and a second surface for dissipating heat from the mounting base. The mounting base can include evaporator channels arranged in the vicinity of the first surface, condenser channels in the vicinity of the second surface and a first and second connecting part for passing fluid between the condenser channels and evaporator channels. | 11-03-2011 |
20110254493 | METHOD AND ARRANGEMENT IN CONNECTION WITH ELECTRIC DEVICE SYSTEM - A method and arrangement in connection with an electric drive system are provided. The electric drive system includes an intermediate circuit with two or more supply units and two or more inverter units connected thereto, and an electric machine having two or more three-phase windings galvanically separated from each other. Two or more inverter units are connected to the three-phase windings. The arrangement also includes first main circuit switches to galvanically separate each supply unit from a supply, second main circuit switches to galvanically separate each supply unit from the intermediate circuit, first intermediate circuit switches to galvanically separate each inverter unit from the intermediate circuit, and second intermediate circuit switches to galvanically separate each inverter unit from the electric machine. | 10-20-2011 |
20110254473 | ARRANGEMENT AND METHOD FOR CONTROLLING FREQUENCY CONVERTER MODULES - An arrangement for controlling frequency converter modules of an electric drive. In the arrangement, the frequency converter modules are arranged to control alternatively a first motor or several motors having less power than the first motor. | 10-20-2011 |
20110200454 | METHOD IN CONNECTION WITH A PUMP DRIVEN WITH A FREQUENCY CONVERTER AND FREQUENCY CONVERTER - An exemplary frequency converter and method are directed to estimating an operation point of a pump when the QH characteristic curve of the pump is known. The frequency converter controls the pump, and a process curve is estimated when a first operation point of the pump is in the nominal range. The process curve defines a head as a function of volumetric flow. A rotational speed of the pump is determined and a QH characteristic curve of the pump is converted to a current rotational speed of the pump based on affinity laws. A second operation point of the pump is estimated by determining an intersection point of the converted QH characteristic curve and the estimated process curve. | 08-18-2011 |
20110198064 | COOLING STRUCTURE FOR ELECTRONIC DEVICE, AND A METHOD - This disclosure relates to a cooling structure for an electronic device including an inlet for conveying a flow in a first flow direction towards a first component and an outlet for conveying the flow further. To deter dirt particles from proceeding to electronic components, the cooling structure can include a second flow channel, which starts from a port oriented transversely to the first flow direction or away therefrom and receives part of the flow from the inlet, and which conveys the part of the flow to an electronic component located in the second flow channel. | 08-18-2011 |
20110181212 | CONTROL METHOD FOR FREQUENCY CONVERTER - A motor drive and a method in connection with a motor drive including a frequency converter are provided. The motor of the drive is connected to a load, and the motor is controlled with the frequency controller. The method includes the steps of converting changes in electrical quantities of the motor caused by actions affecting the load into observations representing the changes, selecting control symbols on the basis of matching of the sequences of observations with a set of valid patterns, and controlling the converter based on the selected symbols. | 07-28-2011 |
20110176274 | COOLING ELEMENT - A cooling element for an electronic apparatus can include an inlet for receiving fluid, an outlet for forwarding fluid from the cooling element, and multiple pipes providing parallel fluid paths for passing the fluid from the inlet to the outlet. To obtain a simple and efficient cooling element, multiple base plates for receiving electronic components can be attached to the pipes for conducting heat generated by the electronic components to the fluid in the pipes. | 07-21-2011 |
20110169504 | METHOD AND APPARATUS FOR MEASURING BEARING CURRENTS IN AN ELECTRICAL MACHINE - The present disclosure relates to a measuring bearing currents in an electrical machine. According to exemplary embodiments, radio frequency signals that are generated by electric discharges are detected by an antenna near the bearing. A synchronizing signal is combined with the origin of the bearing current and signal triggered by the synchronizing signal is measured. | 07-14-2011 |
20110149513 | POWER ELECTRONIC APPARATUS WITH COOLING ARRANGEMENT - A power electronic apparatus with cooling arrangement comprises a housing ( | 06-23-2011 |
20110149512 | POWER ELECTRONIC APPARATUSES WITH COOLING ARRANGEMENTS - A power electronic device with cooling arrangement includes a housing that accommodates power electronic components. At least two adjacent axial fans are connected to the housing for inducing an airflow from outside into the housing in order to cool the power electronic components. Furthermore, the device can include a separating wall that extends outside the housing from between the at least two adjacent axial fans in order to reduce noise caused by the fans. Such a cooling arrangement can provide a power electronic device with effective cooling in compact size and also having an acceptable level of noise. | 06-23-2011 |
20110148334 | METHOD AND ARRANGEMENT FOR CONTROLLING PERMANENT MAGNET SYNCHRONOUS MACHINES - A method and an arrangement are provided for controlling a sensorless permanent magnet synchronous machine using a frequency converter connected to feed the machine with electrical power. A current a current vector having a magnitude is produced to the stator of the machine with the frequency converter, and the current vector is rotated for rotating the rotor of the machine. Prior to starting the drive, a value is defined for the magnitude of the current vector and a frequency limit. The defined value is used as the magnitude of the current vector when the rotor of the machine is rotated with a frequency that is lower than the defined frequency limit. A vector control method is used for controlling the machine when the frequency of the machine is higher than or equal to the defined frequency limit. | 06-23-2011 |
20110147185 | CONTROLLER UNIT FOR SWITCHING DEVICE - Exemplary embodiments are directed to a controller unit for a switching device. The controller unit includes a body part and an operating axle. The operating axle is connected to contacts of the switching device to adjust a respective state of the contacts between a closed position and an open position. A control axle includes a first axle part and a second axle part, the first axle part is arranged to be turned by a user, and the second axle part is functionally connected to the operating axle to turn it between the open position and the closed position. A tripping assembly is functionally connected to the operating axle to turn the operating axle from the closed position to the open position. The controller unit also includes connecting means for functionally connecting a first axle part to one of a tripping assembly and a second axle part. | 06-23-2011 |
20110147184 | CONTROLLER UNIT FOR SWITCHING DEVICE - Exemplary embodiments are directed to a controller unit for a switching device. The controller unit includes a body part and an operating axle, which is turnable between a closed position and an open position in relation to the body part and is functionally connectable to contacts of the switching device to change respective states of the contacts between the closed position and the open position. The controller also includes a control axle that is turned by a user between an off-position and an on-position in relation to the body part and is functionally connected to turn the operating axle. A tripping assembly is functionally connected to the operating axle such that the tripping event of the tripping assembly turns the operating axle from the closed position to the open position. Connecting means selectably connect the control axle to the tripping assembly. | 06-23-2011 |
20110147183 | TRIPPING ASSEMBLY FOR SWITCHING DEVICE - A tripping assembly is provided for a switching device. The tripping assembly includes: a body part, a tripping axle configured to turn between a trip position and a tensioned position in relation to the body part; a tripping frame configured to turn between a trip position and a tensioned position in relation to the body part and whose turning axis is substantially parallel with the turning axis of the tripping axle; at least one tripping spring which has an non-tensioned state and a tensioned state and which is functionally connected to the tripping axle and to the tripping frame; a frame spring which has a non-tensioned state and a tensioned state and which is functionally connected between the body part and the tripping frame; and a connecting member which is arranged to functionally connect the tripping axle and the tripping frame both in the final stage of a tensioning event and in the initial stage of a tripping event. In the tripping event: (i) both the frame spring and the at least one tripping spring are configured to transfer from the tensioned state to the non-tensioned state, thus releasing energy needed for the tripping event to the tripping assembly; and (ii) the tripping frame and the tripping axle are configured to turn from their tensioned positions to their trip positions, and while doing so, to turn to opposite directions with respect to one another. | 06-23-2011 |
20110128105 | METHOD FOR MANUFACTURING COIL, AND A COIL - A coil includes electrically conductive winding wire wound in turns around a core in one or more layers. The surface of the winding wire is provided with at least one groove in the direction of the longitudinal axis of the winding wire, and at least one cooling tube which enables coolant circulation is positioned in the groove of the winding wire, being at least partly embedded therein. The groove is formed on the surface of the winding wire of an outermost winding wire layer relative to the core and opens away from the core The cooling tube in the groove is placed around the outermost winding wire layer and covers the outermost winding wire layer at least partly. | 06-02-2011 |
20110076163 | METHOD AND APPARATUS IN CONNECTION WITH PUMP DRIVE - A method in connection with a pump drive connected to a container or the like, wherein a frequency converter is arranged to supply power to a pump in such a manner that a pump flow (Q | 03-31-2011 |
20110074489 | INVERTER - A two-level or multi-level inverter are supplied with a positive auxiliary voltage (Ug+) and a negative auxiliary voltage (Ug−). A bootstrap technique provides a first positive auxiliary voltage and a first negative auxiliary voltage from the supplied potentials. The bootstrap technique provides at least one additional negative auxiliary voltage to a switch driver of at least one semiconductor switch from the first negative auxiliary voltage. At the start up of an inverter, the inverter can perform a startup sequence to provide auxiliary voltages to the respective auxiliary voltage inputs of the switch drivers by turning the power semiconductors sequentially on and off. | 03-31-2011 |
20110071684 | METHOD AND ARRANGEMENT FOR OPERATING A SHIP RAMP - A method and arrangement are provided for operating a ship ramp driven by an electric motor between an upper end position and a lower end position. The arrangement includes means for reducing the maximum torque of the at least one electric motor when the ramp is in proximity to an end position of the ramp, and means for determining the position of the ramp on the basis of at least one of the number of rotations performed by the at least one electric motor, a quantity indicative of the number of rotations, and an elapsed time in accordance with the velocity of the ramp. The arrangement also includes means for allowing the reduction of the maximum torque of the at least one electric motor only when the determined position of the ramp is within a zone defined by predetermined limits. | 03-24-2011 |
20110069520 | FREQUENCY CONVERTER - A frequency converter includes a housing, a frequency conversion component installed in the housing, a controller that controls the frequency conversion component, and a user interface that transmits control commands from a user to the controller. The controller of the frequency converter are provided with a load examination function that examines whether a load is connected to an output of the frequency conversion component, the controller raising an output frequency of the frequency conversion component to a desired value in response to a load connected to the frequency conversion component and detected by the load examination function. | 03-24-2011 |
20110061834 | COOLED BASE PLATE FOR ELECTRIC COMPONENTS - A cooled base plate is provided for electric components. A first side of the cooled base plate is provided for attaching exothermal electric components thereto. On a second side of the base plate, opposite to the first side, there is embedded a cooling channel system having a cooling fluid inlet at a first end of the base plate and a cooling fluid outlet at a second end of the base plate. In order to minimize differences in temperature between the electric components, the thickness of the base plate increases in the direction from the inlet of the cooling channel system towards the outlet of the cooling channel system, e.g., in the flow direction of the cooling fluid, for at least a portion of the length of the base plate. | 03-17-2011 |
20110010116 | INDUCTION MOTOR PARAMETER IDENTIFICATION - A method and an arrangement are provided for identifying parameters of an induction machine when the induction machine is connected to the output phases of a voltage source inverter and the induction machine is in standstill state. The method includes providing a DC magnetization current (i | 01-13-2011 |
20110001447 | ESTIMATION OF PARAMETERS OF AN INDUCTION MACHINE - A method and an arrangement are disclosed for identifying one or more parameters of an induction machine when the induction machine is connected to the output phases of a voltage source inverter and the induction machine is in standstill state. The method can include a first phase for magnetizing the machine by providing a first DC magnetization current until the induction machine reaches steady state, the current reference of the inverter having a first value (i | 01-06-2011 |
20100290196 | ELECTRICAL CABINET - The disclosure relates to an electrical cabinet for receiving and enclosing an electrical apparatus such that the electrical apparatus can be isolated from surroundings by the electrical cabinet. To address water condensing inside the electrical cabinet, a roof construction of the electrical cabinet includes at least a first capillary part located above the electrical apparatus, and the first capillary part includes capillary grooves for recovering liquid condensing on the first capillary part. | 11-18-2010 |
20100265659 | ELECTRIC DRIVE - An electric drive is disclosed which includes at least a choke unit, a power step unit, and a capacitor unit for implementing power supply to an electricity-consuming device. A cooling arrangement is disclosed for cooling the choke unit, the power step unit, and the capacitor unit. The choke unit, the power step unit, and the capacitor unit can be distributed into at least two separate and separately coolable entities, and the cooling arrangement can include parallel cooling apparatuses for cooling the at least two separate and separately coolable entities. | 10-21-2010 |
20100237727 | ARRANGEMENT AND METHOD FOR COOLING AN ELECTRICAL MACHINE - An exemplary arrangement is disclosed for cooling an electrical machine having an external rotor rotating around its rotation axis and a stator having sheet packs, located inside the rotor at the end of an air gap. In the arrangement, a first part of a coolant flow is conducted from both ends of the stator through axial cooling channels into the stator sheet pack. A second part of the coolant flow is conducted from both ends of the stator into the air gap and from the air gap through at least one radial cooling channel into the stator sheet pack. Both parts of the coolant flow are conductable into at least one heat exchanger placed radially inside and at a distance from the stator sheet pack. At least one fan is placed radially inside the heat exchanger to send the first and the second part of the coolant flow to the ends of the stator. | 09-23-2010 |
20100232106 | ARRANGEMENT FOR A MOTOR CONTROLLER - An arrangement is disclosed for a motor controller, the arrangement including a number of power semiconductors and cooling elements, the cooling elements being connected to the power semiconductors for cooling them. The power semiconductors and the cooling elements are disposed around a center axis of the arrangement in such a manner that they demark a channel around the center axis from at least three sides, to which channel cooling surfaces of the cooling elements extend and in which the cooling medium is able to flow in the direction of the center axis, and the power semiconductors extend from the connections between the power semiconductors and the cooling elements substantially away from the center axis. The arrangement can further include at least one choke disposed in the channel demarked around the center axis. | 09-16-2010 |
20100226153 | METHOD AND ARRANGEMENT IN CONNECTION WITH HALF-CONTROLLED NETWORK BRIDGE - A method and an arrangement for controlling phase-specific thyristors of a half-controlled network bridge. The method comprises the steps of identifying continuously a thyristor to be controlled on the basis of magnitudes of supplying phase voltages; controlling the thyristor by enabling a current flow to its gate current circuit through an inductive component of a constant current regulator, which constant current regulator is common to all the gate current circuits, the thyristor control comprising the steps of determining a magnitude of the gate current at the potential of the gate conductor in the constant current regulator, alternately switching the voltage producing the gate current off from the gate current circuit when the gate current is higher than a predetermined limit, and switching the voltage producing the gate current on in the gate current circuit when the gate current is lower than a predetermined limit. | 09-09-2010 |
20100194512 | PERMANENT MAGNET DC INDUCTOR - A permanent magnet DC inductor is disclosed which includes at least two separate and individual magnetic inductors, each having its own core structure and forming closed individual magnetic paths having at least one magnetic gap. Windings are provided on the magnetic cores, and at least one permanent magnet piece is provided with each inductor. The separate magnetic cores having the at least one magnetic gap are arranged against each other to form external magnetic gaps with the permanent magnet pieces arranged inside the external magnetic gaps on both sides of the at least one magnetic gap. | 08-05-2010 |
20100194451 | METHOD OF CONTROLLING AN IGBT AND A GATE DRIVER - A method is disclosed for controlling an IGBT component and a gate driver. An exemplary method includes producing, with two separate driver circuits, a gate voltage for controlling the IGBT component, the outputs of the driver circuits being connected to free ends of a series connection of resistive components. A location, such as a midpoint between the series connection, forms the gate voltage. | 08-05-2010 |
20100188135 | LOAD BALANCING OF PARALLEL CONNECTED INVERTER MODULES - A method and an arrangement are disclosed for balancing load between parallel connected inverter modules, which inverter modules are arranged to supply a common load. The method can include providing similar switching instructions for parallel connected inverter modules, determining on the basis of phase currents of each parallel inverter module a first time period for each output phase of each inverter module for correcting current imbalance by advancing or delaying turn-on or turn-off time instants of switch components of the inverter modules, and advancing or delaying the turn-on or turn-off time instants of the switching instructions based on the first time period. The method also can include determining temperatures of each output phase of each inverter module, modifying the switching instructions for one or more of the parallel inverter modules for controlling the temperatures of the output phases, and controlling the inverter modules with a switching instruction in which the turn-on or turn-off times have been advanced or delayed in respect of one or more parallel modules and further modified in respect of one or more inverter modules. | 07-29-2010 |
20100188122 | SYNCHRONIZING AN INVERTER WITH AN ALTERNATING VOLTAGE SOURCE - A method and device are disclosed for synchronizing an inverter with an alternating voltage source. The method includes measuring a current generated by the alternating voltage source and flowing through diodes of the inverter, determining a phase angle and angular velocity relating to the alternating voltage source from the measured current for enabling synchronization between the inverter and the alternating voltage source, and starting modulation of the inverter according to the obtained phase angle and angular velocity. | 07-29-2010 |
20100181412 | METHOD AND APPARATUS FOR DECELERATING A MACHINE REEL OF AN UNWINDER - A method and apparatus are provided for decelerating an inverter-controlled machine reel in a paper machine. The method includes detecting a break in a paper web from a machine reel, determining the inertia of the machine reel, determining continuously the angular speed of the machine reel, and determining continuously the torque required to decelerate the machine reel, on the basis of the determined inertia and angular speed, for the purpose of stopping the machine reel in a predefined time. The method also includes decelerating the machine reel electrically to stop the machine reel, in accordance with the determined torque, and using a mechanical brake when the rotation speed of the machine reel is lower than a predefined rotation speed and when the torque obtained by electrical deceleration is too small to stop the machine reel in a predefined time. | 07-22-2010 |
20100180926 | SOLAR POWER PLANT - A solar power plant is disclosed for converting solar energy into electric energy, and having a plurality of solar cell units, each solar cell unit containing a first cell pole and a second cell pole. The cell poles can cooperate for feeding electric energy produced by the solar cell unit as direct current out of the solar cell unit. A direct-current converter can include a plurality of direct-current input poles and two direct-current output poles, each direct-current input pole being connected to at least one cell pole. The direct-current converter can convert input direct currents entered via the direct-current input poles, and having input voltages, into an output direct current having an output voltage, and feed the output direct current via the direct-current output poles out of the direct-current converter. The direct-current converter can include a three-phase inverter unit having three phase poles and two direct-voltage poles, the inverter unit being adapted to serve as a direct-current converter in such a manner that each of the three phase poles are adapted as direct-current input poles and each of the direct-voltage poles is in electrically conductive connection to exactly one direct-current output pole of the direct-current converter. | 07-22-2010 |
20100164665 | METHOD FOR MANUFACTURING INDUCTIVE ELECTRIC COMPONENT, AND INDUCTIVE ELECTRIC COMPONENT - A method and electric component, such as inductor, coil, resistor, or the like, are disclosed wherein a winding includes at least one spiral or coiled element, the spiral or coiled element being formed from a piece furnished with cooling ribs. | 07-01-2010 |
20100164319 | METHOD FOR MANUFACTURING A WINDING COIL FOR AN ELECTRICAL MACHINE AND A WINDING FOR AN ELECTRICAL MACHINE - The object of the invention is a method for manufacturing a winding coil for an electrical machine, as well as the corresponding winding. The electrical machine comprises a stator sheet pack in which slots are arranged at the edge of the inner circumference of the sheet pack for fitting the winding coils. In the method, a winding coil is made of flat wire so that one coil turn ( | 07-01-2010 |
20100156435 | METHOD AND ARRANGEMENT FOR MONITORING CONNECTIONS OF SWITCH INTENDED FOR ACTIVATING SAFETY FUNCTION - A method and an arrangement are disclosed for monitoring connections of a switch intended for activating a safety function, the switch having at least two poles. The arrangement can supply voltages to first sides of two poles of the switch through first connections, and monitor the voltages supplied through the switch and further from second sides of the two poles of the switch to a device through second connections. The arrangement can form a voltage difference between the voltages to be supplied to the first sides of the two poles of the switch, and detect a connection failure when the difference between the voltages supplied to the device does not correspond with the formed voltage difference or when the difference between the voltages supplied to the device is substantially zero. | 06-24-2010 |
20100156178 | METHOD AND ARRANGEMENT FOR LIMITING ELECTRIC POWER REQUIRED BY ELECTRIC LOADS - A method and arrangement for limiting an electric power required by at least two electric loads, each of which has a predetermined priority level, the arrangement comprising means ( | 06-24-2010 |
20100143157 | METHOD AND SYSTEM FOR DETECTING CAVITATION OF PUMP AND FREQUENCY CONVERTER - A method and a system are disclosed in accordance with a pump controlled with a frequency converter. An exemplary method includes controlling the pump with a frequency converter, the frequency converter feeding a motor connected to drive the pump, providing a torque estimate (T | 06-10-2010 |
20100142238 | METHOD AND DEVICE IN FREQUENCY CONVERTER - A method in connection with a frequency converter for correcting the power factor of the frequency converter, and a power factor correction unit. The method includes connecting the power factor correction unit between a rectifier bridge of the frequency converter and the supplying AC voltage network, generating with the power factor correction unit DC voltage from the AC voltage of the supply network and feeding the generated DC voltage to the frequency converter via the rectifier bridge of the frequency converter. | 06-10-2010 |
20100134064 | METHOD AND APPARATUS FOR ESTIMATING A ROTATION SPEED OF AN ELECTRIC MOTOR - A method is disclosed for estimating a rotation speed of an electric motor supplied by an inverter, by determining a time derivative of a stator current vector of the electric motor during a zero vector state of the inverter; and determining an estimate of the rotation speed of the electric motor on the basis of the determined time derivative of the stator current vector. | 06-03-2010 |
20100133933 | COOLING ARRANGEMENT FOR AN ELECTRICAL MACHINE - A cooling arrangement is disclosed for an electrical machine in which the main cooling air circulation within the machine is arranged using a centrifugal blower in at least one of the ends of the machine, making the main cooling air circulation flow through at least an air space in the machine and the outer surface of the stator. A circulating fan is arranged in the immediate vicinity of the centrifugal fan for the purpose of generating a coil end circulation that circulates air at least in the area of the machine's coil ends. | 06-03-2010 |
20100128505 | CURRENT MEASUREMENT IN AN INVERTER UNIT AND A FREQUENCY CONVERTER - A method and an arrangement of measuring inverter current, where the inverter is connected to and supplied by a DC intermediate circuit having two or more parallel capacitor branches connected between the positive and negative rail of the DC intermediate circuit, and the capacitance of the capacitor branches being known. The method comprises the steps of measuring the current of one of the parallel capacitor branches, and determining from the measured current the magnitude of the inverter current. | 05-27-2010 |
20100116191 | MOORING WINCH AND A METHOD FOR CONTROLLING A CABLE OF A MOORING WINCH - An electrically driven mooring includes a winding drum ( | 05-13-2010 |
20100106301 | METHOD FOR CONTROLLING AN ELECTRIC DRIVE - The invention discloses a method for controlling an electric drive that drives reels of a slitter in the paper machine. In the method at least speed and acceleration/deceleration of a slitter is controlled. According to the invention a limit value of the electric drive is defined in the method, values of at least two or more parameters effecting to the electric drive is monitored, a reference value of the acceleration/deceleration is defined on the basis of at least two parameters, and the electric drive is controlled so that the acceleration/deceleration corresponds to the highest possible reference value, by which the reference value of the acceleration/deceleration defined on the basis of any parameter is not exceeded, and that the limit value of the electric drive is not exceeded. | 04-29-2010 |
20100097121 | METHOD AND ARRANGEMENT FOR CONTROLLING SEMICONDUCTOR COMPONENT - A method is disclosed for controlling a semiconductor component which includes a voltage controlled gate. The method includes determining and storing, prior to use of the semiconductor component, reference values of a gate voltage to be given to the gate of the semiconductor component during a change of operating states. The method also includes providing a pulse width modulated voltage from a driver circuit to a resistor connected to the gate of the semiconductor component according to the stored reference values of the gate voltage when a change in operating states of the semiconductor component is desired. | 04-22-2010 |
20100060328 | REDUCTION OF SEMICONDUCTOR STRESSES - A method of reducing thermal stresses of a semiconductor component in a frequency converter, an arrangement in a frequency converter, and a frequency converter, wherein the semiconductor component is attached to a cooling element for cooling the semiconductor component and one or more resistive elements are attached to the cooling element. In the method, the cooling element is heated by the one or more resistive elements attached thereto by supplying current from the frequency converter through the one or more resistive elements for obtaining an elevated lowest temperature for the semiconductor component and thereby reducing the amount of temperature change between the highest and the lowest temperatures in the semiconductor component during use of the frequency converter. | 03-11-2010 |
20100052582 | METHOD AND ARRANGEMENT FOR DETERMINING ROTATION SPEED OF A MOTOR - A method and an arrangement for determining the rotation speed of a motor fed by an inverter, the arrangement comprising means for determining the rotation speed of the motor in at least two alternative manners, whereby the means for determining the rotation speed of the motor comprise one of the at least two alternative manners of performance: means for measuring the frequency of the voltage fed to the motor by the inverter; and means for estimating the rotation speed of the motor on the basis of the measured frequency. | 03-04-2010 |
20100039445 | DISPLAYING INFORMATION ON MOVING OBJECTS, AND FREQUENCY CONVERTER - A method, equipment and frequency converter for displaying information on a moving object, the information being displayed using a light source row arranged to the moving object. The method comprises the steps of generating the information to be displayed; controlling the movement of the moving object by the frequency converter; generating control data for the light source row in accordance with information obtained from the frequency converter on the motion state of the moving object and the information to be displayed; and controlling the light sources in the light source row arranged to the moving object in accordance with the control data. | 02-18-2010 |
20100039162 | METHOD OF CONTROLLING A RECTIFYING BRIDGE IN A DIODE MODE AND A CIRCUIT FOR THE CONTROL - A method and a circuit for controlling a thyristor (V | 02-18-2010 |
20100039161 | METHOD OF CONTROLLING A RECTIFYING BRIDGE AND A CIRCUIT FOR THE CONTROL - A circuit for controlling a thyristor (V | 02-18-2010 |
20100019597 | ROTOR FOR A PERMANENT-MAGNET ELECTRICAL MACHINE - The object of the invention is a rotor for an electrical machine excited by permanent magnets, said rotor comprising a substantially cylindrical magnetic body of the rotor fitted onto the shaft of the electrical machine and a set of permanent magnets used to create a first and a second pole alternately in the circumferential direction, excited in opposite directions. The permanent magnets are fitted into openings arranged within the rotor. The rotor comprises a body part with several segments extending to the outer circumference in the circumferential direction and an outward tapered section remaining between the segments in the radial direction of the rotor. Permanent-magnet pieces are arranged between each section and segment. | 01-28-2010 |
20100001608 | ROTOR FOR ELECTRIC MACHINE - Electric machine rotor comprising: an inner rotor element and an outer rotor element positioned more outwards in the radial direction than the inner rotor element, the inner rotor element and the outer rotor element being made of a material of high permeance, and an air gap of low permeance between the inner rotor element and the outer rotor element. The outer rotor element forms a shape-mating pair with the inner rotor element, the inner rotor element and the outer rotor element being shaped in such a way that radial detachment of the outer rotor element from the inner rotor element is prevented. | 01-07-2010 |
20090295588 | METHOD AND APPARATUS FOR VERIFYING A LEAK IN CONNECTION WITH A FLOW INHIBITOR - The present invention relates to a method for verifying a leak situation in a liquid transfer system where liquid is transferred with a frequency-converter-controlled pump from a lower pressure to a higher pressure and where liquid is prevented from being transferred from a higher pressure to a lower pressure with one or more check valves positioned in a pipe system. The method is characterized by comprising the steps of comprising the steps of generating for the frequency converter motion information on the motion of the pump between the motion operations, and indicating a leak situation of the check valve if the direction of operation of the pump is, in the motion information, opposite to the direction of operation during the use of the pump. Further, the invention relates to a system and a control unit of a frequency converter for implementing the method. | 12-03-2009 |
20090267545 | METHOD AND ARRANGEMENT IN CONNECTION WITH A BRAKE CHOPPER - A method of controlling a brake chopper and a control arrangement, the brake chopper being connected between the positive and the negative rails of an intermediate voltage circuit feeding an inverter bridge, wherein current measurement means are arranged between a DC voltage source and the brake chopper and adapted to measure DC current flowing in the intermediate voltage circuit, which method comprises steps of forming with the inverter bridge an output voltage to a load connected to the output of the inverter bridge, determining a time instant when the DC current of the intermediate circuit is sampled, and preventing the use of the brake chopper at the determined time instant. | 10-29-2009 |
20090261668 | COOLING ELEMENT FOR AN ELECTRICAL MACHINE - In an electrical machine cooling element according to the invention, the electrical machine ( | 10-22-2009 |
20090231891 | REACTOR ARRANGEMENT FOR ALTERNATING ELECTRICAL CURRENT - A reactor arrangement for alternating electrical current includes different coils ( | 09-17-2009 |
20090231074 | REACTOR ARRANGEMENT - A reactor arrangement for alternating electrical currents includes, for each alternating electrical current, different coils ( | 09-17-2009 |
20090190281 | LOAD CONTROL APPARATUS - A load control apparatus adapted to indirectly detect an overcurrent, i.e. a current magnitude exceeding a predetermined limit value, occurring in an electric conductor element ( | 07-30-2009 |
20090177295 | METHOD AND APPARATUS FOR TRANSFERRING SIGNAL DATA - The invention relates to a method and device for transferring signal data from a sender to one or more receivers. The invention includes receiving a quantity as a function of time, arranging the quantity into a first polynomial to obtain values for polynomial coefficients of a first continuous signal, and transferring the values of the polynomial coefficients of the first continuous signal via a first data transfer link to one or more receivers. | 07-09-2009 |
20090165473 | AIR DEHUMIDIFIER FOR FREQUENCY CONVERTER ARRANGEMENT - The invention relates to an air dehumidifier for a frequency converter arrangement ( | 07-02-2009 |
20090160453 | METHOD AND APPARATUS FOR DETECTING GROUND FAULT - Method and apparatus for detecting a ground fault, the apparatus comprising means arranged to monitor a sum current of output phases of a frequency converter, means arranged to detect a ground fault, if the sum current exceeds a predetermined threshold value, and means for performing the initial setting of the threshold value, the means being arranged to determine the value of the sum current when the frequency converter starts up and to set the threshold value so that it is greater than the predetermined value of the sum current. | 06-25-2009 |
20090146521 | PERMANENT MAGNET MODULE AND AN ELECTRICAL MACHINE ROTOR INCLUDING THE MODULE - The object of the invention is a permanent magnet module comprising at least two permanent magnets with the first magnetic pole on the first plane surface and the second magnetic pole on the second plane surface, and a cover at least partially enveloping the permanent magnets. According to the invention the cover of the module is magnetically conductive and comprises a top surface, substantially covering the first plane surface of the permanent magnet, and a bottom surface, substantially covering the second plane surface of the permanent magnet. The cover is at least partially open at the side surfaces of the permanent magnet. Another object of the invention is a rotor for an electrical machine, the rotor having permanent magnets fitted into a corresponding module. | 06-11-2009 |
20090146520 | PERMANENT MAGNET UNIT FOR AN ELECTRICAL MACHINE, A METHOD OF INSTALLING PERMANENT MAGNET UNITS AND A ROTOR OF AN ELECTRICAL MACHINE - In a permanent magnet unit according to the invention, designed for an electrical machine comprising a stator and rotor, at least one permanent magnet ( | 06-11-2009 |
20090138669 | Frequency Converter - The present invention relates to a frequency converter ( | 05-28-2009 |
20090134714 | COMPENSATION OF HARMONICS OF ELECTRICAL NETWORK - A system and a method for compensating harmonic components or a reactive power of an electrical network. The system comprises a measurement unit ( | 05-28-2009 |
20090116405 | Redundant Automation Data Communications Network - The object of the invention is an automation data communications network ( | 05-07-2009 |
20090103570 | Time Synchronization in Serial Communications - A real-time clock ( | 04-23-2009 |
20090096408 | FREQUENCY CONVERTER - The present invention relates to a frequency converter comprising electric power supply devices for supplying electric power to an electric motor ( | 04-16-2009 |
20090094080 | METHOD AND A SYSTEM FOR IMPROVING THE OPERABILITY OF A PRODUCTION PLANT - A method for improving the operability of a production plant is invented. The production plant has at least one production process comprising at least one equipment, a system for obtaining equipment condition measuring data and a system for obtaining maintenance work data. The equipment condition measuring data and the maintenance work data is continuously acquired and stored to equipment reliability calculation system, and equipment reliability is calculated based on the equipment condition measuring data and the maintenance work data. | 04-09-2009 |
20090066453 | CHOKE OF ELECTRIC DEVICE - The present invention relates to a choke ( | 03-12-2009 |
20090059625 | SINGLE-PHASE TO THREE-PHASE CONVERTER - Single-phase to three-phase converter comprising a rectifier stage, a DC link and an inverter stage, wherein the rectifier comprises a filter choke, one controllable switch for power factor correction, rectifying diodes arranged in a diode bridge configuration having input terminals and output terminals, the controllable switch being connected to the output terminals of the diode bridge, an upper blocking diode arranged between the positive output terminal of the diode bridge and the positive input of the DC link and a lower blocking diode arranged between the negative output terminal of the diode bridge and the negative input of the DC link, the DC link comprises a capacitor bank connected between the DC link, which capacitor bank has a center point. The inverter stage comprises three phase outputs, two of which are formed with a series connections of controllable switches arranged between the DC link for switching either positive voltage or negative voltage of the DC link to the phase outputs, and one phase output is formed of the voltage of the center point of the capacitor bank, and in that the center point of the capacitor bank is configured to be optionally connected to the neutral line of the single-phase AC input by using a connection switch element providing thereby doubled voltage to the DC link. | 03-05-2009 |
20090052217 | METHOD AND APPARATUS FOR STABILIZING VOLTAGE OF INTERMEDIATE CIRCUT OF FREQUENCY CONVERTER - A method and an apparatus for damping voltage oscillation of a voltage intermediate circuit of a frequency converter, the frequency converter comprising a half controlled rectifier bridge coupled to a supply network. The method comprises determining magnitude (U | 02-26-2009 |
20090039987 | Switching Device Module - A switching device module comprising a frame ( | 02-12-2009 |
20090022391 | Method and Product for Detecting Abnormalities - A new method for processing image data in order to detect abnormalities in a web is provided. The web is monitored by at least one camera, whereby an image comprising of plurality of pixels is generated. The data of the image is stored in a memory. Image data is filtered by a processor by creating a filtered image data by weighting the image data and at least one of earlier image data and earlier filtered image data; and combining the weighted image data and at least one of the weighted earlier image data and the weighted earlier filtered image data; and controlling filtering by at least one nonlinear algorithm; and thresholding the created filtered image data. | 01-22-2009 |
20090000767 | COOLING ELEMENT - The present invention relates to a cooling element ( | 01-01-2009 |
20080316777 | Method for thermal protection of frequency converter and a frequency converter - A method for thermal protection of a frequency converter and a frequency converter that comprises means for controlling the output current of the frequency converter. The method comprises the steps of determining beforehand two or more data points which define a thermal current limit for a semiconductor component of the frequency converter at specific temperatures at two or more switching frequencies, determining beforehand two or more data points which define a thermal current limit for the semiconductor component at specific temperatures at a zero converter output frequency, measuring the temperature of the semiconductor component, determining the switching frequency of the frequency converter, determining the output frequency of the frequency converter, determining the highest allowable thermal current as a function of measured temperature, determined switching frequency and determined output frequency on the basis of the defined data points, and limiting the output current of the frequency converter to the determined highest allowable thermal current. | 12-25-2008 |