Class / Patent application number | Description | Number of patent applications / Date published |
318379000 | Locally closed armature circuit | 68 |
20090045762 | MOTOR DRIVE CIRCUIT, METHOD, AND COOLING DEVICE USING THE SAME - A drive signal generation circuit generates drive signals that control ON and OFF states of transistors of a H-bridge circuit, in accordance with a target value of torque. A driver circuit alternatively turns ON and OFF high side transistors, and low side transistors of the H-bridge circuit, based on the drive signals outputted from the drive signal generation circuit. The driver circuit immediately turns OFF the high side transistors, when an instruction is issued to stop a motor, and after a predetermined delay time τd has elapsed, turns OFF the low side transistors. | 02-19-2009 |
20090167218 | METHOD AND APPARATUS FOR BRAKING A MOTOR - The invention relates to a method and an arrangement for braking a synchronous motor ( | 07-02-2009 |
20090315491 | ELECTRIC MOTOR - An electric motor has a DC link circuit ( | 12-24-2009 |
20100066279 | Method and Apparatus of Fan Motor Brake - An electronic system for controlling a fan motor includes a microcontroller and a drive circuit. The microcontroller draws power from a first voltage source and generates control signals for sending drive current to stator coils of a fan motor via the drive circuit. The electronic system further includes a second voltage source to provide the microcontroller with an amount of energy sufficient to operate for a short period of time when the voltage of the first voltage source drops below a predetermined level. The microcontroller is configured to detect when the voltage level of the first voltage source drops below a given level and generates control signals for the drive circuit to discharge energy in the stator coils of the fan motor to quickly stop operation of the fan motor within a short period of time. | 03-18-2010 |
20100194315 | POWER TOOLS - One aspect according to the present invention includes a power tool including a control device that can output a brake operation signal to a DC motor to apply a short-circuit brake thereto in response to turning off an operation switch. The brake operation signal is stopped depending on the rotational speed of the motor when the operation switch is turned off during the rotation of the DC motor. | 08-05-2010 |
20110068721 | Drive device - A driving device for a hatch in a vehicle, with a housing tube connected to a base part or to a movable structural component part, a protective tube connected to the movable structural component part or to the base part, a spindle drive having a threaded spindle and a spindle nut arranged on the threaded spindle by which the housing tube and the protective tube are movable axially relative to one another. A rotary drive drives the spindle drive in rotation includes at least one electric motor. The driving device has a safety circuit that causes a braking effect on the rotary drive when the rotary drive is deactivated and when extraneous forces are introduced into the driving device from the outside. | 03-24-2011 |
20110181213 | FAN SYSTEM AND BRAKE CONTROL CIRCUIT THEREOF - A fan system including a motor with a coil, a storage unit, a driver, and a buffer circuit is provided. The coil module has a first connection terminal and a second connection terminal. The storage unit electrically couples with a voltage source, stores electrical energy when the voltage source is available, and releases the stored electrical energy to carry out a brake operation when the voltage source is unavailable. The driver electrically couples with the first and second connection terminals of the coil module to control a direction of an inductor current passing through the coil module. The buffer circuit electrically couples with the coil module. In the brake operation, the buffer circuit operates to form a transient potential between the first and second connection terminals of the coil module and to consume electrical energy of the inductor current, for gradually stopping the motor in a buffering time period. | 07-28-2011 |
20120013278 | RESISTORLESS DYNAMIC MOTOR BRAKING SYSTEM AND METHOD - Systems and methods are provided for regenerative motor braking. The regenerative braking systems and methods allow the braking torque of a multi-phase motor to be controlled while keeping currents to acceptable levels and without supplying electrical energy back to the voltage source. The regenerative braking systems and methods dissipate energy in the motor windings instead of sending this energy to the voltage source by intelligently switching the low-side switches in the inverter between the ON and OFF states at the commutation frequency while maintaining the high-side switches in the inverter in the OFF state. | 01-19-2012 |
20120019177 | Power Tool Having An Electric Brake - The invention relates to a method for decelerating a drive movement of a power tool and to a power tool suitable for carrying out the method, having a drive driven by a motor, an energy supply device for the provision of electrical energy, a controller having a motor controller for activating the motor and an operating-state recognition module which is to detect at least one operating-state variable and, as a function of this, to output a brake signal, the controller being designed to initiate, as a function of the brake signal, a braking procedure in which brake cycles are provided which have a first time segment, in which the motor is short-circuited, and a second time segment in which current is fed to the motor opposite to its original direction of rotation. | 01-26-2012 |
20120319627 | Braking Device for a Universal Motor - An electrodynamic braking device for a universal motor includes a field winding configured to be fed from a grid during a braking operation, and an armature that is configured to be directly short-circuited. A braking process is performed by means of control electronics. Good braking is achieved with relatively low brush wear. Such an electrodynamic braking device can be used effectively for a power tool. | 12-20-2012 |
20120326638 | METHOD FOR CONTROLLING AN INVERTER FOR DRIVING A SWING MOTOR - The present disclosure relates to a method of controlling an inverter for driving a swing motor, and particularly, maximally generates braking torque of the swing motor upon generation of failure of the inverter by switching on/off a lower-phase switch or an upper-phase switch of the inverter in order to prevent an upper swing body from freely rotating which is generated when a semiconductor switch of the inverter is switched off upon the generation of over-current and over-voltage of the inverter that drives the swing motor, thereby being capable of protecting the inverter, rapidly stopping the upper swing body, and preventing the risk of accidents. | 12-27-2012 |
20130154525 | ASSEMBLY COMPRISING A MOVABLE AND BRAKABLE/DAMPABLE PART AND A METHOD FOR BRAKING A MOVABLE PART - An assembly comprising a movable element being movable in relation to a base, a first electric motor for moving the element in relation to the base, the motor having one or more first windings each having at least two inputs, a first braking element being adapted to determine whether power and/or signals are provided to the first motor and being adapted to alter between at least two modes wherein, in a first of the modes, no power/signals is/are provided to the first motor and a first galvanic connection is provided between the inputs of at least one of the first windings and a first element having a predetermined resistance and wherein in a second of the modes, power/signals is/are provided to the first motor and the first galvanic connection is disconnected. | 06-20-2013 |
20130200825 | MOTOR CONTROL DEVICE AND CONTROL METHOD OF THE SAME - To provide a motor control device which can apply an electric brake to a motor when power supply is stopped, and achieve a miniaturization and a cost reduction. A first switch | 08-08-2013 |
20130241450 | SWITCHING DEVICE AND METHOD FOR TERMINATING A BRAKING PROCESS OF A THREE-PHASE AC MOTOR - A switching device and method are disclosed for terminating a braking process of a three-phase AC motor. The braking process of the AC motor is performed by way of a first and second thyristor. During the braking process of the AC motor, in a first step the first thyristor is actuated in such a way that a braking current is fed to the AC motor, and therefore a torque which brakes the AC motor is produced. In a second step the second thyristor is actuated in such a way that, when the first thyristor is quenched, the braking current is taken on by the second thyristor and the braking torque is maintained. The two steps are repeated during the braking process; wherein the second step is suppressed during the braking process after a last actuation of the first thyristor. | 09-19-2013 |
20130271046 | ELECTRONIC EMERGENCY-STOP BRAKING CIRCUIT FOR ROBOTIC ARMS - Representative embodiments of a system for braking a cyclically rotating motor upon a power failure include (i) charge-storage circuitry for storing charge and converting the stored charge to an output voltage upon power failure; (ii) one or more passive electrical elements for conducting current induced by motor rotations; and (iii) voltage-actuated circuitry connected to the passive electrical element and the charge-storage circuitry for braking the motor during each half-cycle of motor rotation. The circuitry is inactive until actuated by the charge-storage circuitry upon power failure. | 10-17-2013 |
20140111124 | SYSTEMS AND METHODS FOR BRAKING AN ELECTRIC MOTOR - A motor controller for an electric motor having a stator and a rotor. The motor controller includes a power input for receiving AC power from a power source; a control input for receiving a control signal from a control; and circuitry for switching power from the power source to the electric motor in response to the control signal. The circuitry is operable to: apply a braking waveform to the stator while the rotor is rotating; monitor a reactive power of the stator; detect an increase in the reactive power of the stator to determine the rotor has substantially stopped rotating; and remove the braking waveform from the stator in response to detecting the increase in the reactive power. | 04-24-2014 |
20140239859 | MOTOR DRIVE FOR ON-LOAD TAP CHANGER - The invention relates to a motor drive for an on-load tap changer with an electrical DC motor and a braking device for denned braking of this motor. According to the invention, the braking device has a first diode (D | 08-28-2014 |
20140368133 | ELECTRIC WORKING MACHINE - An electric working machine including: a motor; a driving unit configured to be driven by the motor; a trigger switch configured to allow rotation of the motor; a power supply unit configured to supply electric power to the motor; and a control unit configured to control rotation of the motor, characterized in that: the electric working machine further comprises a switching element configured to perform short-circuiting between terminals of the motor to apply electronic braking, wherein the control unit is configured to perform adjustment of the braking by controlling the switching element when stopping the motor. | 12-18-2014 |
20150108928 | SYSTEMS AND METHODS FOR BRAKING AN ELECTRIC MOTOR - A motor controller for an electric motor having a stator and a rotor. The motor controller includes a power input for receiving AC power from a power source; a control input for receiving a control signal from a control; and circuitry for switching power from the power source to the electric motor in response to the control signal. The circuitry is operable to: apply a braking waveform to the stator while the rotor is rotating; monitor a reactive power of the stator; detect an increase in the reactive power of the stator to determine the rotor has substantially stopped rotating; and remove the braking waveform from the stator in response to detecting the increase in the reactive power. | 04-23-2015 |
20150137717 | BRAKING APPARATUS FOR ELECTRIC POWER TOOL - One aspect of an embodiment of the present disclosure is a braking apparatus for an electric power tool that includes a switching circuit with six switching elements and a brake control unit. The brake control unit switches any one selected switching element of three switching elements forming one selected switch group of a high-side switch group and a low-side switch group to an off state from an on state at a timing at which braking current flows through a diode connected in parallel to the selected switching element upon turn-off of the selected switching element. | 05-21-2015 |
20150311830 | Control Circuit and Electrical Device - The control circuit includes: a first power supply, including a high-level output and a low-level output; a first circuit, including two inputs, a driver module and at least two braking switch units, the two inputs being respectively connected to the high-level output and the low-level output of the first power supply, and the driver module being in series connected to the at least two braking switch units, where the driver module includes two outputs which are the outputs of the control circuit; and braking circuits, which correspond to the braking switch units in a one to one manner, and are used to the control switching states of the braking switch units. | 10-29-2015 |
20160149521 | POWER-OFF BRAKE CIRCUIT FOR DC FAN - The present invention relates to a power-off brake circuit for a DC fan, which comprises a control unit, a motor driver unit, a switch unit, a power-off protection unit, and a brake unit and a brake unit. The control unit is coupled to the motor driver unit, the switch unit, the power-off protection unit. The brake unit is coupled to the motor driver unit and the power-off protection unit. By means of the circuit design of the present invention, the independent brake loop is used to achieve the effects of power-off brake and of the accurate control of rotating speed is improved. | 05-26-2016 |
20160204720 | CONTROL DEVICE | 07-14-2016 |
20160380559 | MOTOR SYSTEM AND FAN MODULE USING THE SAME - A motor system includes a stator magnetic pole, a driving unit and a stop control unit. The stator magnetic pole is adapted to couple with a rotor for the rotor to rotate relative to the stator magnetic pole. The stator magnetic pole has first and second ends. The driving unit is electrically connected with the stator magnetic pole and drives the rotor to rotate by changing the polarity of the stator magnetic pole. The stop control unit is electrically connected to the stator magnetic pole and the driving unit. If the rotor rotates when the motor system is not electrically powered, the stator magnetic pole generates electricity that changes the path of the electric current flowing through the stop control unit, and the stator magnetic pole outputs an electric current from the first end to the second end or from the second end to the first end thereof. In addition, a fan module is also disclosed to solve the problem. | 12-29-2016 |
318380000 | Closed through impedance or the like | 40 |
20080265813 | DYNAMIC BRAKING LOAD ANALYZER - A dynamic braking load analyzer that determines the proper resistance value for a dynamic braking load resistor to be used in combination with a variable frequency drive or servo-drive to accommodate the power dissipated from an induction motor when it is being reduced in speed. The analyzer includes a resistor bank having a plurality of resistors electrically coupled in parallel. Switches are provided between the resistors, and a resistor selector switch determines which resistors are switched into the resistor bank circuit. A heat sensing resistor in the resistor bank measures the heat generated by the resistors and provides a signal that is read by a heat meter. The combination of the temperature measurement and the resistance of the resistors in the circuit gives the proper braking resistance value for the deceleration of the induction motor. | 10-30-2008 |
20080290825 | POWER ARCHITECTURE AND BRAKING CIRCUITS FOR DC MOTOR-PROPELLED VEHICLE - A dynamic braking circuit that can be operated with stability over both high and low speed regimes. This circuit has the advantage of using fewer components than previous circuits. In addition, when in braking mode, the armature and field currents tend to oppose each other across the main braking switch hence reducing electromechanical stresses when in high current regime. According to a second embodiment, a dynamic braking circuit implements a “soft” extended braking function with the capability of providing a smoother braking action at high braking effort at little extra cost resulting from the replacement of a contactor by a reverser. The main advantages of this preferred embodiment are that the current generated by the armatures during braking can be controlled independently from the excitation of the field windings at low speeds and that it enables simultaneous self supply, regeneration and dynamic braking. | 11-27-2008 |
20090058333 | ELEVATING MACHINE CONTROL APPARATUS - An elevating machine control apparatus controls an inverter ( | 03-05-2009 |
20090102404 | Control Circuit For An Electromotor With Electronic Brake Switch - The invention relates to a control circuit for controlling a DC voltage power supply, whereby the control circuit comprises a switching element connected in series to the motor and a bypass switch connected in parallel to the electromotor for braking the electromotor by means of bypassing, with the bypass switch being formed by a semiconductor and the control circuit comprising a control circuit for controlling the bypass switch and a detector connected to the control circuit for detecting the status of the switching element. Semiconductors are less sensitive to vibrations and dirt. They are furthermore so small that they can easily be mounted on the same carrier as the other components of the control circuit. The control circuit is preferably arranged for gradually increasing the conductivity of the bypass switch once the switching element is open. Mechanical shocks when the tool is switched off are prevented by means of the partial conductivity of the semiconductor switch. | 04-23-2009 |
20090200969 | REGENERATIVE BRAKING APPARATUS - In a regenerative braking apparatus that is connected to a power supply apparatus that supplies electric power to a load, and consumes regenerative power regenerated from a load side together with other regenerative braking apparatuses that are connected to the power supply apparatus, an operation-level changing unit calculates, as occasion demands, according to energization time of a consuming unit, a lower limit of an operation level for judging whether an energizing unit should be actuated and changing and outputting the calculated lower limit of the operation level, a comparing unit compares the lower limit of the operation level output from the operation-level changing unit and a monitor output of a monitoring unit, and the energizing unit operates when the monitor output exceeds the lower limit of the operation level by a driving unit. | 08-13-2009 |
20090218966 | ELECTRIC DRIVE SYSTEM FOR VEHICLE, ELECTRIC CONTROL SYSTEM FOR VEHICLE, ELECTRIC DRIVE METHOD FOR VEHICLE - In an electric drive system for a vehicle, an alternator is driven by an engine to generate electric power which is used to drive a motor to generate a driving force. During a retardation of the vehicle, the motor is operated as an alternator to convert kinetic energy to electric energy which is used to retard the vehicle. A retard resistor is provided for absorbing electric energy generated during the retardation state. The retard resistor is cooled down by an AC blower. | 09-03-2009 |
20090267544 | MOTOR CONTROL CIRCUIT AND OPERATION METHOD THEREOF - A motor control circuit for controlling a motor includes a brake circuit and a control circuit. The brake circuit is for making the motor enter a braking state. The control circuit is for detecting a residual energy of the motor in the braking state. When the residual energy conforms to a predetermined criterion, the control circuit makes the motor exit the braking state. | 10-29-2009 |
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 |
20090295315 | DYNAMIC BRAKING CIRCUIT FOR A HYBRID LOCOMOTIVE - Methods of dynamic braking include two embodiments with braking circuits for vehicles such as, for example, locomotives which are operable down to very low speeds. These circuits can provide a braking force even at zero locomotive speed. | 12-03-2009 |
20090309523 | Motor driving device, and control method of motor driving device - A motor driving device includes a first power supply terminal, a second power supply terminal, a drive unit that is coupled to the first power supply terminal, the second power supply terminal, and a motor winding, a control unit that controls the drive unit, and a resistive element that is coupled between the drive unit and the first power supply terminal. The control unit makes the motor winding and the resistive element form a loop circuit when a voltage between the first power supply terminal and the second power supply terminal exceeds a predetermined value. | 12-17-2009 |
20100066280 | Electric drive retarding system and method - A retarding system for an electric drive machine ( | 03-18-2010 |
20100066281 | TRACTION DRIVE OF A RAIL VEHICLE FOR DRIVING AND GENERATIVE BRAKING - The invention relates to a traction drive for the driving and generative braking of a rail vehicle or a combination of rail vehicles, a permanent-field synchronous motor and a traction current converter being respectively associated with at least two axles of the rail vehicle or combination of rail vehicles. The traction current converter includes at least one pulse current converter on the engine side, and the clamps of the permanent-field synchronous motor are connected to a change-over switch such that the permanent-field synchronous motor can be connected to a load circuit containing at least one load element, in order to drive the pulse current converter or for generative braking. According to the invention, the load circuits connected to the permanent-field synchronous motors for generative braking are designed such that the brake characteristic lines of the permanent-field synchronous motors differ in terms of characteristic features such as the position of the maximum of the brake torque according to the rotational speed. | 03-18-2010 |
20100066282 | TRACTION DRIVE OF A RAIL VEHICLE FOR DRIVING AND GENERATIVE BRAKING WITH LOAD CORRECTION - The invention relates to a traction drive for the driving and generative braking of a rail vehicle or a combination of rail vehicles, at least one permanent-field synchronous motor and a traction current converter being associated with at least one axle of the rail vehicle or combination of rail vehicles. The traction current converter includes at least one pulse current converter on the engine side, and the clamps of the permanent-field synchronous motor are connected to a change-over switch such that the permanent-field synchronous motor can be connected to a load circuit forming a load, to drive the pulse current converter or for generative braking. According to the invention, the load circuit connected to the permanent-field synchronous motor for generative braking is designed and/or controlled in such a way that the characteristic values of the load circuit can be modified according to the loading of the rail vehicle or combination of rail vehicles. | 03-18-2010 |
20100102763 | HYBRID WORKING MACHINE - In a hybrid excavator, a generator motor and a hydraulic pump are driven by using an engine as a power source. A battery is charged with power generated by the generator motor. A rotation motor is driven by the generator motor and the battery. The voltage of a DC bus is detected by a voltage sensor, and whether the battery is unusable is determined by a breakdown detector. When the battery becomes unusable, emergency evacuation control is performed so that the power consumption of the rotation motor will be suppressed to be less than or equal to the power generation of the generator motor while maintaining the DC bus voltage greater than or equal to the normal operation voltage of the system. | 04-29-2010 |
20100188029 | BRAKING SYSTEM FOR THE UNDERCARRIAGE OF AN AIRCRAFT - A braking system for an aircraft provided with undercarriage, wherein an axial-flux reversible electric machine is set between the wheel and the frame of the undercarriage; current-dissipating resistors are provided, which can be connected to the windings of the axial-flux reversible electric machine during rotation of said wheel for dissipating by the Joule effect the induced currents generated by the axial-flux electric machine, which behaves as current generator, and producing a braking effect that slows down the movement of the wheel, thus exerting a braking action. | 07-29-2010 |
20100320944 | Braking Circuit for a Door Actuator with a Generatively Operable Electrical Motor - A braking circuit is adapted to supply generatively produced energy of the motor as load resistance to a bipolar transistor. The braking circuit has a voltage regulator, which controls a voltage, applied to the base terminal of the bipolar transistor to achieve an associated controlled voltage based on a reference voltage. A first power supply connector of the electrical motor, in the generator mode of operation of the electrical motor, is coupled to a collector terminal of the bipolar transistor and to the voltage input of a voltage regulator. A second power supply connector of the electrical motor is coupled to an emitter terminal of the bipolar transistor and is coupled to a reference input of the voltage regulator via a resistive branch including at least one electrical resistor. | 12-23-2010 |
20110057588 | DYNAMIC BRAKING FOR CURRENT SOURCE CONVERTER BASED DRIVE - Current source converter (CSC) based motor drives and control techniques are presented in which DC link current is regulated to a level set by the output inverter during dynamic braking operation by pulse width modulation of a braking resistance connection signal to maintain control of motor torque and speed while mitigating or preventing line side regenerative currents. | 03-10-2011 |
20110156621 | RAIL VEHICLE WHICH HAS A PERMANENT-MAGNET SYNCHRONOUS MOTOR AS TRACTION MOTOR - A rail vehicle has a permanent-magnet synchronous motor as its traction motor. A switching apparatus is arranged between a converter and the traction motor, connects the traction motor to the converter in the driving mode and connects the traction motor to at least one braking resistance during generator operation of the traction motor. The switching apparatus can be operated pneumatically and is for this purpose connected to a main air control line of a compressed-air braking system. In the driving mode, when the pressure in the main air control line is greater than a threshold value, the traction motor is connected to the converter. For braking, when the pressure in the main air control line is less than the threshold value, the traction motor is connected to the at least one braking resistance. | 06-30-2011 |
20110254475 | ELECTRIC BRAKE SYSTEM WITH MAGNETIC LOSS - An electric brake system for an electromechanical machine connected to output terminals of an inverter, input terminals of which are supplied by a DC voltage source. The system includes an electrical circuit connected between the input terminals of the inverter and including, connected in series: a mechanism dissipating electrical energy returned by the electromechanical machine to the input terminals of the inverter during a braking phase of the electromechanical machine, including an inductor wound around a magnetic circuit; and a switching mechanism to close the electrical circuit during a braking phase of the electromechanical machine and to open the electrical circuit in absence of a braking phase of the electromechanical machine. | 10-20-2011 |
20110260661 | Brake Resistor Control - An electric drive system comprises a generator, a traction motor, a brake resistor, a bus, and a control unit. The generator, the traction motor, and the brake resistor are coupled electrically to the bus. The control unit is configured to determine a pulse-width-modulation duty cycle for the brake resistor (“brake duty”) and control operation of the brake resistor according to the brake duty, wherein the brake duty can be a value intermediate of constant OFF and constant ON. A method of operating the electric drive system is also disclosed. | 10-27-2011 |
20120062155 | Retarding Grid Cooling System and Control - A cooling system ( | 03-15-2012 |
20120119685 | POWER TRANSDUCER - The performance of a power transducer is improved while efficiently using a power semiconductor also by managing the permissible duty factor of the power semiconductor in the regenerative braking circuit provided in the power transducer. The user is allowed to set, through an operation panel provided on the power transducer, the resistance value of the regenerative braking resistor for thermally consuming the rotational energy generated during motor deceleration. The power transducer performs the steps of: calculating the current which flows in the regenerative braking circuit from the resistance value setting; obtaining the generation loss of the power semiconductor in the regenerative braking circuit with the calculated current value; and determining the permissible duty factor of the power semiconductor from the obtained generation loss. | 05-17-2012 |
20120286707 | Method and Apparatus for Controlling Dynamic Braking on Locomotives - A system and method are provided for controlling a locomotive such that the braking effort is maintained at its optimal maximum level throughout the extended range. The method comprises detecting a first reduction in speed of the locomotive; energizing at least one solid state device connected across one or more grid resistors for a first predetermined amount of time to divert current away from the one or more grid resistors for the first predetermined amount of time; and de-energizing the solid state device after the first predetermined amount of time. The solid state device may be an Isolated Gate Bipolar Transistor (IGBT) and a plurality of solid state devices are energized, each solid state device being connected across a corresponding resistor grid. | 11-15-2012 |
20130162182 | CONTROLLING RETARDING TORQUE IN AN ELECTRIC DRIVE SYSTEM - The disclosure describes, in one aspect, a system for a machine having an electric drive configuration. The system includes an electric motor associated with at least one wheel and adapted to provide retarding torque to the wheel, and a controller configured to determine a power measurement of a retarding grid and control the retarding torque to the at least one wheel during retarding as a function of the power measurement. | 06-27-2013 |
20130285583 | DRIVE WITH CONNECTABLE LOAD ELEMENT - A drive with an electric machine which can be operated as a motor for generating a positive drive force and as a generator for generating a negative drive force (braking force), a rechargeable battery, which supplies power to the electric machine in the motor operating mode and can be recharged by the electric machine in generator operating mode, and devices including a load resistor for limiting the charging of the rechargeable battery. The limiting devices also have devices for generating a flow which dissipates heat upstream of the load resistor. | 10-31-2013 |
20130342136 | POWER TRANSDUCER - The performance of a power transducer is improved while efficiently using a power semiconductor also by managing the permissible duty factor of the power semiconductor in the regenerative braking circuit provided in the power transducer. The user is allowed to set, through an operation panel provided on the power transducer, the resistance value of the regenerative braking resistor for thermally consuming the rotational energy generated during motor deceleration. The power transducer performs the steps of: calculating the current which flows in the regenerative braking circuit from the resistance value setting; obtaining the generation loss of the power semiconductor in the regenerative braking circuit with the calculated current value; and determining the permissible duty factor of the power semiconductor from the obtained generation loss. | 12-26-2013 |
20140097772 | ELECTRIC MOTOR BRAKING USING THERMOELECTRIC COOLING - An electric motor controller includes controller electronics configured to control an electric motor. The electric motor controller also includes a thermoelectric cooler in thermal communication with the controller electronics. The thermoelectric cooler is configured to receive a braking current associated with braking of the electric motor and provide cooling to the controller electronics. | 04-10-2014 |
20140111125 | Traction Motor Retarding Flux Reference - A traction motor system calculates motor flux by generating a real time effective resistance of a resistance grid calculated from motor torque and measured voltage on a DC link. Calculating effective resistance avoids solely relying on DC link voltage, which can be influenced by conditions such as wheel slip and drop out of one or more resistance grids. The effective resistance calculation is based on nominal motor values using known power levels and conditions. From these nominal values and the effective resistance, various scaling factors based on actual motor power can be generated and used to adjust a nominal flux reference to more accurately reflect actual motor flux. The scaling factors include power and torque scaling factors and a resistance scaling factor that is active during conditions such as wheel slip. | 04-24-2014 |
20140125260 | VEHICLE AND METHOD FOR CONTROLLING VEHICLE - A vehicle includes an engine, an EHC (electrical heated catalyst), a first MG (motor generator) generating a counter electromotive force at the time of vehicle collision, a battery, a PCU (power control unit) having a converter and an inverter performing power conversion between the battery and the first MG, and an ECU. The PCU is connected to the battery through an SMR (system main relay). The EHC is connected between the converter and the inverter through EHC relay. The ECU determines whether or not vehicle collision has occurred. When the vehicle collision has occurred, the ECU opens the SMR to electrically separate the battery and the PCU and closes the EHC relay to electrically connect the EHC and the first MG, so that the counter electromotive force generated in the first MG at the time of vehicle collision is consumed at the EHC. | 05-08-2014 |
20140184113 | BRAKING AND AUXILIARY POWER CONVERTER - An integrated power converter includes first and second auxiliary switch modules, and one or more braking switch modules. The first auxiliary switch module is mounted at a first location of a laminated bus bar, and connects a first auxiliary lead with a first power layer and a second power layer of the bus bar. The second auxiliary switch module is mounted at a second location of the bus bar, and connects a second auxiliary lead with the first and second power layers. The braking switch modules are mounted at additional locations of the bus bar, adjacent to the first and second locations. Each braking switch module connects a braking lead with one of the power layers of the bus bar, and with a dual diode module or with the other power layer of the bus bar. | 07-03-2014 |
20140203741 | HEATING ELEMENT UNIT, CONTROL PANEL, ROBOT SYSTEM, AND HEAT RADIATION METHOD IN HEATING ELEMENT UNIT - A heating element unit according to an embodiment includes a heating element, a heat transfer base in which the heating element is provided, and a casing in which the heat transfer base is arranged. The heat transfer base includes a mounting wall on which the heating element is mounted in a close contact state, and side walls that perpendicularly extend in a same direction from both ends in a short direction of the mounting wall and are mounted on an inner surface of the casing in a contact state. | 07-24-2014 |
20140252998 | DRIVE SYSTEM WITH A DIRECT CURRENT MOTOR BRAKE - One embodiment of a drive system may include a motor shaft coupled to a gear set in connection between an input shaft and an output shaft. The system may also have a direct current motor selectively holding the motor shaft in a fixed position for engaging the input and output shafts to one another in response to a sudden power loss from a main power supply. The system may further include an auxiliary power supply enabling the direct current motor to provide a resistive torque. | 09-11-2014 |
20140252999 | CONTINUOUSLY VARIABLE DYNAMIC BRAKE FOR A LOCOMOTIVE - This disclosure is directed to a traction motor drive system. The traction motor drive system may include a field winding subsystem comprising a field winding associated with a traction motor. The traction motor drive system may also include an armature subsystem arranged in parallel with the field winding subsystem. The armature subsystem may include an armature having first and second armature terminals and a grid resistor selectively electrically coupled in series with the armature. The armature subsystem may also include an armature chopper arranged in parallel with the grid resistor and electrically coupled in series with the armature. The armature chopper may be configured, when the grid resistor is electrically coupled to the armature, to conditionally conduct current to the armature. | 09-11-2014 |
20140300298 | POWER STAGE PRECHARGING AND DYNAMIC BRAKING APPARATUS FOR MULTILEVEL INVERTER - Precharging and dynamic braking circuits are presented for multilevel inverter power stages of a power converter with a shared resistor connected to charge a DC bus capacitor with current from the rectifier circuit in a first operating mode and connected in parallel with the capacitor to dissipate power in a dynamic braking mode. | 10-09-2014 |
20140368134 | ELECTRIC VEHICLE DRIVE SYSTEM - An electric vehicle drive system includes an electric-vehicle power conversion device, and an earth ground switch that is a triple-pole single-throw switch having a switching contact unit. The electric-vehicle power conversion device includes a smoothing circuit unit that includes a filter capacitor that receives and stores therein power supplied from an overhead wire, an inverter that converts a DC voltage of the smoothing circuit unit into an AC voltage to drive an electric motor, and a brake chopper circuit that consumes excess power, which cannot be returned toward the overhead wire. A brake resistance in the brake chopper circuit is connected to the switching contact unit. When the switching contact unit is closed, the brake resistance is electrically connected between the positive electrode and the negative electrode of the filter capacitor. | 12-18-2014 |
20150042248 | BLOWER SYSTEM AND METHOD - A system includes a grid coupled to an electrical bus; an electrical power modulation device coupled to the electrical bus that can output modified electrical power received from the electrical bus: a blower motor coupled to the electrical power modulation device that can receive the modified electrical power output and can provide a stream of air to affect a temperature of the grid, and a controller. A speed of the blower motor may be based at least in part on an amount of the modified electrical power. The controller can receive an operating parameter, and is responsive to that parameter by causing the electrical power modulation device to vary the amount of the modified electrical power. A blower motor speed may be controlled based at least in part on the operating parameter. | 02-12-2015 |
20150130375 | METHOD AND APPARATUS FOR AN EMERGENCY LOWERING KIT - A method and apparatus are disclosed for lowering a load on a direct current hoist motor during an electrical power interruption, the method including but not limited to determining in a crane processor that the electrical power interruption has occurred; and providing a brake assist current to shunt field on the direct current hoist motor to produce a counter torque in the hoist motor. | 05-14-2015 |
20160089983 | Braking Grid Cooling System - A braking grid cooling system may include a fan having a hub supporting a rotor and at least partially enclosing a stator, and a plurality of fan blades connected to and projecting radially from the hub; and a dynamic braking grid receiving the fan in a nested relation such that a combined height of the grid and the fan is less than a sum of a height of the grid and a height of the fan. | 03-31-2016 |
20160173011 | MOTOR DRIVER HAVING INTEGRATED BRAKING CHOPPER | 06-16-2016 |
20170232847 | ELECTRIC VEHICLE CONTROLLER | 08-17-2017 |
318381000 | With field or secondary circuit control | 4 |
20090212724 | Method for Braking an AC Motor - A system for braking a motor. The system includes at least one resistor and a contactor connected to the at least one resistor and a motor. The system further includes a variable frequency drive electrically connected to the motor, wherein the variable frequency drive comprises a controller operably connected to the contactor, wherein at least a portion of the contactor closes connecting the at least one resistor to the motor in response to a command from the controller. The variable frequency drive is configured such that motor flux levels may be maintained at a relatively high level as motor torque current is reduced, resulting in a consistently high motor flux level as the motor speed decreases. | 08-27-2009 |
20100244753 | METHOD AND ELECTRIC MACHINE FOR BRAKING A THERMAL ENGINE OF A VEHICLE DURING THE STOP PHASE THEREOF - A method for braking the thermal engine of an automobile using a multiple-phase rotary electric machine ( | 09-30-2010 |
20110316456 | ELECTRODYNAMIC BRAKING DEVICE FOR A UNIVERSAL MOTOR - The invention relates to an electrodynamic braking device and to a method for braking a universal motor having a field winding and an armature. The universal motor can be switched from a motor mode to a braking mode. In the motor mode, the armature and the field winding are supplied with an alternating current of a power grid. In the braking mode, the armature is short-circuited and the field winding continues to be supplied with an alternating current from the power grid. In a first phase of the braking mode, the field winding can be supplied with an alternating current having the frequency of the power grid. In a further phase of the braking mode, the field winding is supplied by the power grid with an alternating current having a frequency that is reduced with respect to the frequency of the power grid. | 12-29-2011 |
20120091932 | ELECTRODYNAMIC BRAKING DEVICE FOR A UNIVERSAL MOTOR - An electrodynamic braking device for a universal motor is proposed, wherein during a braking operation a field winding is supplied from a network, and an armature is directly short-circuited, and a braking operation is carried out using a program of a controller of a control electronics system, whereby good braking is achieved with relatively low brush wear. Such an electrodynamic braking device is advantageously applied in a power tool equipped with a dangerous tool. | 04-19-2012 |