| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 318812000 | Voltage control | 31 |
| 20080224651 | METHOD AND SYSTEM FOR CONTROLLING PERMANENT MAGNET AC MACHINES - Methods and systems are provided for controlling permanent magnet machines under varying loads. The method comprises generating a d-axis voltage command and a q-axis voltage command, producing a modified d-axis current command based on the q-axis voltage command and a d-axis current command, converting the modified d-axis current command to a modified d-axis voltage command, and transmitting the modified d-axis voltage command and the q-axis voltage command to the PM machine. The d-axis voltage command is based on a d-axis current command. | 09-18-2008 |
| 20090146603 | MVDC power transmission system for sub-sea loads - A system for the transmission of a direct current (DC) at a medium voltage level includes a system DC link configured to carry power from a source to a load module. The load module includes a DC-to-DC voltage step-down converter, a DC-to-AC inverter coupled downstream to the DC-to-DC voltage step-down converter, and a system AC link for carrying power from the load module to a motor system on a load side of the system AC link. The system is effective for delivering power over distances that are greater than 30 kilometers, and for delivery of power from an on-shore to offshore and sub-sea load. | 06-11-2009 |
| 20090174360 | Method And Device For Reducing The Influence Of A DC Component In A Load Current Of An Asynchronous Three-Phase Motor - A method for reducing the influence of a DC component in a load current of an asynchronous three-phase motor, in which the voltages of two of the three phases are controlled by adjusting firing angles of semiconductor devices of the type turning-off at zero-crossing of the current therethrough comprises the steps carried out for each said controlled phase: detecting turn-off times of the semiconductor devices, calculating a value of a change of firing angle of the semiconductor devices needed for changing the length of the time period between two subsequent turn-off times for compensating for the influence of a DC component, and determining the firing angle of said semiconductor devices in dependence of the result of this calculation. | 07-09-2009 |
| 20090200981 | SYSTEM AND METHOD FOR PROVIDING CONSTANT LOADING IN AC POWER APPLICATIONS - A system and method for providing constant loading in AC power applications wherein at least one turn-on point ( | 08-13-2009 |
| 20100013427 | MOTOR CONTROLLER SYSTEM AND METHOD FOR MAXIMIZING ENERGY SAVINGS - A motor controller ( | 01-21-2010 |
| 20100026232 | Mitigation of Harmonic Currents and Conservation of Power in Non-Linear Load Systems - An AC power controller system applies three-phase AC operating power to an induction motor that drives a non-linear mechanical load. A primary low pass filter is connected in series between branch phase conductors and a power controller of the type that uses gate-controlled switching thyristors for controlling power to the motor. KVAR capacitors connected between the power controller and the induction motor phase windings form a secondary low pass filter across the controller output terminals. The primary and secondary low pass filters isolate the power controller and induction motor with respect to spurious noise and harmonics generated by local as well as remote sources, and also improve real power transfer efficiency from the power generating source to the induction motor by transforming the effective impedance of the power source and induction motor load. | 02-04-2010 |
| 20100052601 | VOLTAGE CONTROL AND POWER FACTOR CORRECTION IN AC INDUCTION MOTORS - A voltage control circuit is disclosed. A power factor corrector may utilize the control circuit to provide power factor correction for an AC induction motor. An AC induction motor system may combine the power factor correct with an AC induction motor. | 03-04-2010 |
| 20100085006 | CONTROL DEVICE FOR INDUCTION MOTOR - A control device includes a slip calculator that calculates a first slip frequency of an induction motor, a current detector that detects motor current that passes through the induction motor, an adder that calculates a primary frequency by adding a speed command and a second slip frequency that are given, a command voltage generation unit that generates first command voltage from the primary frequency, a voltage error observer unit that estimates a command voltage error from the first command voltage and the motor current, a slip correction unit that calculates a slip correction amount from the command voltage error, an adder that calculates the second slip frequency by adding the first slip frequency and the slip correction amount, and a voltage error correction unit that corrects the first command voltage using the command voltage error and outputs second command voltage. | 04-08-2010 |
| 20100117588 | MOTOR CONTROLLER SYSTEM AND METHOD FOR MAXIMIZING ENERGY SAVINGS - A motor controller ( | 05-13-2010 |
| 20100213886 | Energy-saving controller for three-phase induction motors - The present invention relates to an energy-saving system for three-phase induction motors and is based on the principle of variable voltage control at constant speed. It is composed of a microprocessor, exampling circuit, sensing circuit, acquiring circuit, firing circuit, and AC to AC converter. The system is to automatically adjust the voltage to the induction motor with the variation in the motor load, in order to obtain high operating power factor and efficiency. The system will result in considerable energy-savings when a three-phase induction motor runs under constant light-load or variable-load with low duty ratio. | 08-26-2010 |
| 20100295500 | TORQUE PRODUCTION IN AN ELECTRIC MOTOR IN RESPONSE TO CURRENT SENSOR ERROR - Methods and systems are provided for producing a commanded torque in an electric motor in a vehicle. A method comprises obtaining a torque command, obtaining a speed of the electric motor, and operating the inverter based at least in part on a voltage command that corresponds to minimal current through the electric motor for producing the commanded torque at the instantaneous speed of the electric motor. | 11-25-2010 |
| 20110006723 | MOTOR DRIVE CONTROL APPARATUS, VEHICLE WITH MOTOR DRIVE CONTROL APPARATUS, AND MOTOR DRIVE CONTROL METHOD - In the hybrid vehicle, a boost converter is controlled to make a post-boost voltage or a voltage on the side of an inverter become a target post-boost voltage corresponding to a target operation point of a motor in accordance with a target post-boost voltage setting map that divides an operation region of the motor into a non-boost region and a boost region when a operation point of the motor is included in the boost region. The target post-boost voltage setting map is prepared so that the non-boost region includes a region in which a loss produced by driving the motor when not boosting the post-boost voltages becomes smaller than the loss produced when boosting the post-boost voltage and the boost region includes a region in which the loss produced when boosting the post-boost voltage becomes smaller than the loss produced when not boosting the post-boost voltage. | 01-13-2011 |
| 20110050156 | Control system for a compressor actuated by an electric motor, an assembly composed of an electric induction motor, an electronic control and an arrangement for motor-compressors, and a method of controlling an electric motor - The present invention relates to a control system, a method and arrangement for motors and motor-compressors, designed for operation in a wide voltage range of the feed network. The control system, method and arrangement for motors and motor-compressors basically consist in associating an electronic control ( | 03-03-2011 |
| 20110121775 | Mitigation of Harmonic Currents and Conservation of Power in Non-Linear Load Systems - An AC power controller system applies three-phase AC operating power to an induction motor that drives a non-linear mechanical load. A primary low pass filter is connected in series between branch phase conductors and a power controller of the type that uses gate-controlled switching thyristors for controlling power to the motor. KVAR capacitors connected between the power controller and the induction motor phase windings form a secondary low pass filter across the controller output terminals. The primary and secondary low pass filters isolate the power controller and induction motor with respect to spurious noise and harmonics generated by local as well as remote sources, and also improve real power transfer efficiency from the power generating source to the induction motor by transforming the effective impedance of the power source and induction motor load. | 05-26-2011 |
| 20110163709 | INDUCTION MOTOR CONTROL SYSTEMS AND METHODS - A control system is provided for an inverter assembly associated with an induction motor. The system includes a current determination module configured to generate q- and d-axis current commands based on a torque command. The current determination module is further configured to generate the q-axis current command based on an observed flux linkage and a flux linkage command. The system further includes a motor current control module coupled to the current determination module and configured to generate q- and d-axis voltage commands based on the q- and d-axis current commands generated by the current determination module and a PWM modulator coupled to the motor current control module configured to generate duty cycle signals for operating the inverter assembly based on the q- and d-axis voltage commands generated by the motor current control module. | 07-07-2011 |
| 20120126741 | LOW-INDUCTANCE, HIGH-EFFICIENCY INDUCTION MACHINE AND METHOD OF MAKING SAME - An electric drive system includes an induction machine and a power converter electrically coupled to the induction machine to drive the induction machine. The power converter comprising a plurality of silicon carbide (SiC) switching devices. The electric drive system further includes a controller that is electrically coupled to the power converter and that is programmed to transmit switching signals to the plurality of SiC switching devices at a given switching frequency such that a peak-to-peak current ripple is less than approximately five percent. | 05-24-2012 |
| 20120194123 | FAN ROTATION SPEED CONTROL CIRCUIT - A fan rotation speed control circuit comprises an AC power source, a coil electrically connected with the AC power source, a sensing module having a first resistor and a sensing device in parallel connection with mentioned first resistor, a capacitor, a DIAC, and a TRIAC having a first terminal, a second terminal and a gate terminal, wherein mentioned coil electrically connected with the first resistor and the sensing device, mentioned capacitor electrically connected with the first resistor and the sensing device, mentioned DIAC electrically connected with the first resistor, the sensing device and the capacitor, mentioned first terminal electrically connected with the first resistor, the sensing device and the coil, mentioned second terminal electrically connected with the capacitor and the AC power source, and mentioned gate terminal electrically connected with the DIAC. | 08-02-2012 |
| 20130057195 | VARIABLE SPEED INDUCTION MOTOR WITH SINGLE EXTERNAL POWER SUPPLY AND CONTROL METHOD THEREOF - A single external power supply variable speed induction motor and a control method thereof are disclosed. An induction motor includes: a stator in which coils directly connected to a single-phase or 3-phase or more systematic power supply are wound; a rotor that is supported to be rotatable in the stator; a power conversion device that is attached to the rotor and controls a rotor current without connection of a separate external power supply; and a control circuit that is connected to the power conversion device and controls the power conversion device. | 03-07-2013 |
| 20130300339 | METHOD AND CONVEYOR SYSTEM - A conveyor system and a method for driving a conveyor are disclosed. In the method, electric power is supplied to the drive machinery of a conveyor depending on the power requirement with a supply device to be selected from at least two different adjustable supply devices, and the supply device supplying power to the drive machinery is changed on the basis of the power requirement of the conveyor. | 11-14-2013 |
| 20140203755 | METHODS AND SYSTEMS FOR CONTROLLING AN ELECTRIC MOTOR - An electric motor controller is configured to be coupled to an electric motor. The controller includes an inverter and a control unit coupled to the inverter. The inverter is configured to receive an input voltage and to provide a conditioned output voltage to the electric motor. The control unit is configured to control the electric motor to produce positive torque when direct current (DC) link voltage has a 100% voltage ripple. Methods for controlling an electric motor using the electric motor controller are also provided. | 07-24-2014 |
| 20140203756 | INVERTER SYSTEM AND COMMUNICATION METHOD - In an inverter system, a phase adjusting unit configured to adjust, according to reception timing of first data, a phase of second PWM carrier to match a phase of first PWM carrier. A master inverter further includes an amplitude adjusting unit configured to adjust, when second data is received by a communication unit, according to the received second data, amplitude of a first command voltage to balance an actual output current output from a master inverter to the motor and an actual output current output from each of one or more slave inverters to the motor. | 07-24-2014 |
| 20150028793 | MOTOR CONTROL APPARATUS - A motor control apparatus includes a secondary-magnetic-flux-command calculating unit including a minimum-current-secondary-magnetic-flux-command calculating unit that calculates a secondary magnetic flux command for minimizing a current root-mean-square value due to a torque current and an excitation current and a PWM-signal generating unit that generates a torque current command for outputting a desired torque command and an excitation current command for outputting the secondary magnetic flux command, performs vector control such that a q-axis current, which is a detection value of the torque current, and a d-axis current, which is a detection value of the excitation current, respectively coincide with the torque current command and the excitation current command, and generates control signals for turning on and off a switching element in an inverter. | 01-29-2015 |
| 20150333683 | MOTOR CONTROL APPARATUS AND MOTOR CONTROL METHOD - A motor control apparatus has an inverter that applies a voltage to an AC induction motor to be driven, a command value calculator that calculates a command value of an AC voltage outputted from the inverter based on a target motor torque of the AC induction motor, and an inverter controller that controls the inverter based on the command value of the AC voltage. The target motor torque of the AC induction motor includes a first target motor torque and a second target motor torque. A high speed response is required in the first target motor torque in order to at least suppress torsional vibration. The second target motor torque is a lower speed response than the first target motor torque. Delay processing is carried out for the second target motor torque. | 11-19-2015 |
| 20160099671 | Speed Control of Variable-Speed Multiple-Phase Motors - Exemplary embodiments or implementations are disclosed of methods, apparatus, and systems for operating motors in variable speed situations. In an exemplary implementation, a method of controlling a variable-speed motor includes defining a control duration as a predetermined number of cycles of a multiple-phase power supply. Each speed in a range of speeds is defined by a corresponding number of the cycles of the control duration. Power is provided to the motor from the power supply at a selected one of the speeds, by enabling input from the power supply for the number of the cycles of the control duration corresponding to the selected speed. | 04-07-2016 |
| 20160134219 | APPARATUS FOR CONTROLLING INVERTER - An inverter controller is provided. The controller according to an exemplary embodiment of the present disclosure generates a compensation voltage to compensate an inverter command voltage using motor torque current and motor information, and apply the compensation voltage to the command voltage. | 05-12-2016 |
| 318813000 | With transformer | 3 |
| 20090243535 | Multi-Input Relay Board - Fan relay boards are provided that include terminals configured to receive line power of approximately 115 volts, 208 volts, 230 volts, and 277 volts. The boards are configured to convert the line power to an approximately 24 volt output that is applied to a distribution circuit to select a high, medium, or low fan speed using relays. The boards may be coupled to a control device that designates the fan speed selected by the relays. The boards also may provide an approximately 24 volt power supply to external devices such as electric heaters, valves, and switches. | 10-01-2009 |
| 20090309536 | VARIABLE VOLTAGE SUPPLY SYSTEM - Apparatus for controlling the voltage supplied to a load, comprising: | 12-17-2009 |
| 20120043922 | Variable Freqency Drive with Dielectric Fluid-Immersed Transformer - A variable frequency drive system for controlling the frequency of a high-voltage power source supplied to a first electric motor includes a transformer section that includes a motorized loadbreak switch system, control power transformers, a controller programmed with control logic to ensure that the motorized loadbreak switch system opens contacts between the high-voltage power source and the variable frequency drive system once the power source is removed, and a tank containing a dielectric fluid, wherein the tank also contains, within the dielectric fluid, a manual isolation switch to supply or remove power to the transformer section, an impedance for use in soft-starting the variable frequency drive system, a primary winding, and a plurality of phase-shifted secondary windings. | 02-23-2012 |
| 318814000 | With impedance control | 1 |
| 20140111134 | Mitigation of Harmonic Currents and Conservation of Power in Non-Linear Load Systems - An AC power controller system applies three-phase AC operating power to an induction motor that drives a non-linear mechanical load. A primary low pass filter is connected in series between branch phase conductors and a power controller of the type that uses gate-controlled switching thyristors for controlling power to the motor. KVAR capacitors connected between the power controller and the induction motor phase windings form a secondary low pass filter across the controller output terminals. The primary and secondary low pass filters isolate the power controller and induction motor with respect to spurious noise and harmonics generated by local as well as remote sources, and also improve real power transfer efficiency from the power generating source to the induction motor by transforming the effective impedance of the power source and induction motor load. | 04-24-2014 |
| 318816000 | Single phase, split phase motors | 2 |
| 20140042955 | Safety System and Method for Pump and Motor - Embodiments of the invention provide a variable frequency drive system and a method of controlling a pump driven by a motor with the pump in fluid communication with a fluid system. The drive system and method can provide one or more of the following: a sleep mode, pipe break detection, a line fill mode, an automatic start mode, dry run protection, an electromagnetic interference filter compatible with a ground fault circuit interrupter, two-wire and three-wire and three-phase motor compatibility, a simple start-up process, automatic password protection, a pump out mode, digital input/output terminals, and removable input and output power terminal blocks. | 02-13-2014 |
| 318817000 | With capacitor | 1 |
| 20150077035 | METHOD FOR SETTING PARAMETERS OF ELECTRONICALLY-COMMUTATED MOTOR FOR USE AS PERMANENT-SPLIT CAPACITOR MOTOR - A method for setting parameters of an ECM motor, the method including: 1) energizing the motor and measuring the AC input voltage Vac; 2) allowing the motor to run according to recorded rotational direction data and rotational speed data when Vac>Vset1; 3) enabling the motor to enter a programming state of rotational direction data and rotational speed data when Vac| 03-19-2015 | |
