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"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Application No. | Application Title | Issue Date |
| 20120126728 | INTEGRATED ELECTRIC MACHINE AND SILICON CARBIDE POWER CONVERTER ASSEMBLY AND METHOD OF MAKING SAME An electric drive system comprising an electric machine comprising a rotor and a stator, a power converter electrically coupled to the electric machine and configured to convert a DC link voltage to an AC output voltage to drive the electric machine, and a single coolin... | 05/24/2012 |
| 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 fu... | 05/24/2012 |
| 20120080259 | MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING APPARATUS An angular velocity estimate (ωe) used in motor control of an electric power steering is obtained as follows. In a first state period during which the motor substantially stops its rotation, a resistance calculation unit calculates a motor resistance value (Rc) on the ... | 04/05/2012 |
| 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 conf... | 07/07/2011 |
| 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-contro... | 05/26/2011 |
| 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 consis... | 03/03/2011 |
| 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... | 01/13/2011 |
| 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 corre... | 11/25/2010 |
| 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 circu... | 08/26/2010 |
| 20100117588 | MOTOR CONTROLLER SYSTEM AND METHOD FOR MAXIMIZING ENERGY SAVINGS A motor controller (4) and method for maximizing the energy savings in an AC induction motor (3) at every load wherein the motor is calibrated at two or more load points to establish a control line (6), which is then programmed into a non-volatile m... | 05/13/2010 |
| 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 ... | 04/08/2010 |
| 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 |
| 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-contro... | 02/04/2010 |
| 20100013427 | MOTOR CONTROLLER SYSTEM AND METHOD FOR MAXIMIZING ENERGY SAVINGS A motor controller (4) and method for maximizing the energy savings in an AC induction motor (3) at every load wherein the motor is calibrated at two or more load points to establish a control line (6), which is then programmed into a non-volatile m... | 01/21/2010 |
| 20090256519 | System, Method and Program Product For Cable Loss Compensation In An Electrical Submersible Pump System An electrical submersible pumping (ESP) system can include a pump located in a wellbore, a motor attached to the pump, a power source located at the surface, a cable electrically coupling the power source and the motor, and a current sensor. The ESP system can also incl... | 10/15/2009 |
| 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 (7) of at least one half cycle of a modulating sine wave (2) is determined; at least one turn-off point (8) of said at least one half cycl... | 08/13/2009 |
| 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 ... | 07/09/2009 |
| 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 t... | 06/11/2009 |
| 20080297099 | MOTOR CONTROLLER, WASHING MACHINE, AND MOTOR CONTROL METHOD A motor controller includes an output voltage modulator that outputs sinusoidally-modulated voltage for driving a motor; a modulation factor specifier allowing specification of a modulation factor greater than 1.0 for the output voltage; a current detector that detects ... | 12/04/2008 |
| 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... | 09/18/2008 |
| 20080174262 | Method of powering a single-phase electric motor and a power supply system for implementing such a method The present invention relates to a method of powering a single-phase asynchronous electric motor, comprising first and second windings, in which method one of the windings is powered by AC mains while the other winding is powered by an inverter that receives a rectified... | 07/24/2008 |
| 20080067971 | INDUCTION MOTOR CONTROLLER An induction motor controller that may include three phase paths leading from a power input to a power output, a solid-state switching device interposed between the power input and the power output on each of the three phase paths, a voltage sensor coupled to two of the... | 03/20/2008 |
| 20080061730 | FREQUENCY CONVERTER, MOTOR, MOTOR DRIVE SYSTEM AND MAINTENANCE METHOD FOR MOTOR DRIVE SYSTEM A frequency converter for outputting a power to drive a motor, having: an inverter unit for inverting a d.c. power to an a.c. power; a control unit for controlling the inverter unit; and a housing for supporting at least the inverter unit and control unit, wherein a ris... | 03/13/2008 |
| 20070278983 | Control of Electrical Machines An electrical machine, such as a switched reluctance motor, has a rotor and a controller arranged to energize at least one electrically energizable phase winding in dependence on the angular position of the rotor. The controller may employ a control law table derived by... | 12/06/2007 |
| 20070236168 | Motor Drive Circuit, Motor System, and Motor Drive Method A circuit suitable for formation as a small sized IC, able to decrease the number of externally attached parts and reduce the size, and stably rotating a motor. When rotating a rotor 101 by three-phase drive signals U, V, and W generated based on a CLK signal fro... | 10/11/2007 |
| 20070182361 | Power converter with active discharging for improved auto-restart capability A method of operating a power converter in response to an interruption in an input power being provided to the power converter, as well as a power converter capable of performing such method and including a rectifier and an inverter coupled at least indirectly with one ... | 08/09/2007 |
| 20070090785 | AUDIBLE NOISE REDUCTION FOR SINGLE CURRENT SHUNT PLATFORM A method and system for reducing audible motor noise in a system for reconstructing motor phase current from a DC bus current comprising current pulses on a DC bus in a PWM inverter motor drive system having a PWM cycle, and for controlling the motor, which forms a comm... | 04/26/2007 |
| 20070075675 | Control circuit of rotational speed of a fan A control circuit of rotational speed of a fan is provided, wherein by a switching of a switch unit, a PWM (Pulse Wide Modulation) unit can output a sampling pulse whose period is changing. A voltage is also changing following the period after taking a sample to an AC v... | 04/05/2007 |
| 20070063668 | A RIDE-THROUGH METHOD AND SYSTEM FOR HVAC&R CHILLERS A method of providing ride-through capability in a chiller/refrigeration system employs a variable speed drive with an active converter stage, a DC link stage and an inverter stage for providing variable frequency and voltage to power at least one motor. An induction mo... | 03/22/2007 |
| 20070024232 | Motor controller, washing machine, air conditioner and electric oil pump A motor controller capable of suppressing a large speed change generated at the time of changeover from a synchronous operation mode to a position feedback operation mode and implementing even acceleration characteristics regardless of the load torque by estimating a to... | 02/01/2007 |
| 20060284590 | Actuator for operating a roller blind and method of operating such an actuator The actuator (ACT) is intended to be linked to phase (AC-H) and neutral (AC-N) conductors. It comprises a motor (MOT) provided with windings (W1, W1), a capacitor (CM) disposed between two ends of the windings and the terminals of which form a first (P1... | 12/21/2006 |
| 20060273755 | Method for estimating the rotor time constant of an induction machine A method for estimating the rotor time constant (τr) of an induction machine when the stator resistance (Rs) and rotor resistance (Rr) of the induction machine are known. The method comprises the steps of feeding a DC current to the sta... | 12/07/2006 |
| 20060250107 | Variable speed drive for a chiller system A variable speed drive with a boost converter is provided for a chiller system driven by an induction motor. The boost converter can be a diode or thyristor rectifier followed by a boost DC/DC converter or a three-phase pulse width modulated boost converter. The boost c... | 11/09/2006 |
| 20060192522 | Modulation methods and apparatus for reducing common mode voltages Methods and apparatus for reducing the common mode voltage generated by eliminating zero-voltage vectors in a rectifier/inverter variable frequency drive (VFD) system includes comparing three phase voltages to each other to determine a maximum voltage in one phase, a mi... | 08/31/2006 |
| 20060119311 | Inverter system for driving induction motor An inverter system for driving an induction motor is disclosed. The inverter system for driving an induction motor comprises: a rectifying circuit for rectifying a three-phase AC voltage and outputting the same; a smoothing circuit for smoothing the rectified voltage an... | 06/08/2006 |
| 20050206341 | Motor current reconstruction via DC bus current measurement A technique for reconstructing phase currents based on measurements of a DC bus current. Non-observable regions of DC bus current samples to reconstruct phase currents are reduced in size by using two phase space vector modulation. The non-observable regions can be furt... | 09/22/2005 |
| 20050189904 | System and method for increasing output horsepower and efficiency in a motor A system and method are provided to increase the horsepower of an induction motor. One technique for increasing the horsepower of a motor is to connect the motor to a variable speed drive that is providing an output voltage and frequency greater than the standard line v... | 09/01/2005 |
| 20050162120 | Method for operation of a converter circuit for a washing machine or a washer/drier, converter circuit, and washing appliance or washer/drier A method is provided for operating a converter circuit, in particular a pulse-width modulated frequency converter circuit having a DC voltage intermediate circuit, which controls two or more winding sections of a polyphase dynamo-electrical machine, in particular a thre... | 07/28/2005 |
| 20050077864 | Control method and system for motor The invention relates to a control method and a control system for a motor. The control method comprising the steps of: (a) determining a motor parameter; (b) providing a d-axis reference current and a q-axis reference current; (c) detecting actual currents of the motor... | 04/14/2005 |
