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| Number | Title | Issue Date |
| 8164288 | Motor control device and generator control device To estimate a fluctuation component of the torque generated at the motor accurately, a motor control device (3) which controls a motor with a stator having armature winding and a rotor having a permanent magnet is provided to include a torque fluctuation comp... | 04/24/2012 |
| 7622887 | Power electronics equipments Power electronics equipment includes air-cored insulating transformers inserted between a control circuit grounded to a vehicle body and an upper arm biased at a high voltage, and air-cored insulating transformers between the control circuit grounded to the vehicle ... | 11/24/2009 |
| 7403700 | Motor control device A motor control device is used to control a motor to rotate. The motor control device includes a phase-wave signal sampling module, a first waveform modulating module, a second waveform modulating module and a control signal integrating module. The phase-wave signal... | 07/22/2008 |
| 7308192 | Motor drive control with a single current sensor using space vector technique A drive system for a three phase brushless AC motor that is operative to optimize a transistor switching pattern to improve power output while allowing current measurement in all of the phases using a single sensor. This is achieved by defining a voltage demand vect... | 12/11/2007 |
| 7304451 | Motor control apparatus and method for generating modulation wave instruction of PWM inverter of the same motor control apparatus A motor control apparatus capable of expanding a voltage output and a modulating wave signal generating method for a PWM inverter apparatus of the motor control apparatus, which is controlled by a pulse width modulating signal obtained by comparing a modulating wave... | 12/04/2007 |
| 7271564 | Method, apparatus, and system for drive control, power conversion, and start-up control in an SRM or PMBDCM drive system A power converter for a switched reluctance motor or a permanent magnet brushless direct current (dc) motor may include first and second partial circuits for forming multiple conduction circuits in cooperation with first and second phase windings of the motor. The c... | 09/18/2007 |
| 7262579 | Inverted electric motor and method for using such to propel a vehicle An alternating current, multiphase, squirrel cage induction electric motor in a unique inverted design, including a method of applying the motor with controls, operator interface, batteries, and peripheral devices to propel a non-polluting electric vehicle. ... | 08/28/2007 |
| 7250740 | Method and apparatus for generating pulse-width modulated waveform In a method of generating pulse-width modulated waveform, the cycle of a carrier wave for the waveform is determined together with a first dead time value and a second dead time value both of which are set in a plurality of up-down counters, respectively. Using the ... | 07/31/2007 |
| 7197410 | Predicting loss of frequency lock between a motor control circuit and a motor Method arid apparatus for accelerating a multi-phase motor having a rotatable rotor are disclosed. The method incorporates use of a motor control circuit to predict a subsequent loss of frequency lock between the motor control circuit and a motor while the motor con... | 03/27/2007 |
| 7193388 | Offset PWM signals for multiphase motor A multi phase motor includes a switching array for interconnecting a power source to each phase. A current sensor senses current supplied from the power source via the switching array to the winding and a controller generates offset PWM signals for controlling the s... | 03/20/2007 |
| 7177106 | Disk storage apparatus A disk storage apparatus including a position detection section for producing position error information corresponding to the current position of a head from servo information which has been previously recorded on a disk and is detected by the head, a position contr... | 02/13/2007 |
| 7161325 | Lead-angle control method and device for operating permanent magnet synchronous motor in flux weakening regions A lead-angle control device according to the present invention includes: a space voltage vector controller calculating effective vector application times necessary for obtaining output voltage vectors of an inverter from stationary-coordinate-system instruction volt... | 01/09/2007 |
| 7148652 | Method and apparatus for determining and handling brake failures in open loop variable frequency drive motors A controller for a variable frequency drive monitors electrical power from a variable frequency drive motor while a brake is maintaining a load driven or moved by the motor without requiring additional feedback components of a closed loop configuration. If excess el... | 12/12/2006 |
| 7148651 | Apparatus and method for controlling AC motor and module therefor A method and apparatus for controlling a permanent magnet synchronous motor by accurately detecting 3-phase motor currents from a DC input current in a full voltage range are provided. In the motor control apparatus for detecting the 3-phase motor currents on the ba... | 12/12/2006 |
| 7142132 | Methods and systems for multi-state switching using at least one ternary input and at least one discrete input Systems, methods and devices are described for placing a controlled device into a desired operating state in response to the position of a multi-position actuator. Two or more switch contacts provide input signals representative of the position of the actuator. Cont... | 11/28/2006 |
| 7126305 | Apparatus for correcting current value of three-phase electric motor and correcting method An apparatus corrects a current value of a three-phase electric motor including a current detector that detects current of each of three phases including a first phase, a second phase, and a third phase. The apparatus includes a current-value correcting unit. When c... | 10/24/2006 |
| 7126306 | Motor control unit Windings of each phase in a three-phase AC motor are independent of one another. A motor control unit gives, to windings of each phase (U, V and W-phase), currents (IU, IV, IW) obtained by adding, to a fundamental sine wave current, a current having a frequency whic... | 10/24/2006 |
| 7112940 | 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... | 09/26/2006 |
| 7084604 | Speed sensorless control of an induction machine using a PWM inverter with output LC filter A method of controlling of an induction machine using an inverter is disclosed with output LC filter. The method includes determining an inverter output current vector (iA), determining an inverter output voltage vector (uA), and ... | 08/01/2006 |
| 7075268 | 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 li... | 07/11/2006 |
| 7064514 | Motor drive system for AC motors A motor drive system without any portion for directly detecting the rotor position, rotation speed and motor phase currents, capable of realizing a high-performance variable speed drive even at high carrier frequencies. When detecting a current from a DC power suppl... | 06/20/2006 |
| 7045988 | Sensorless controller of AC motor and control method A speed control apparatus having a high frequency generator for superposing a high frequency signal on an estimated magnetic flux axis. A high frequency component extractor extracts an error signal of a magnetic flux position from a voltage or current detection sign... | 05/16/2006 |
| 7042194 | Controller for a wound-rotor induction motor A controller for a wound-rotor induction motor includes a first voltage-type converter connected to a secondary winding of the motor, a capacitor for smoothing DC output thereof, a second voltage-type converter to supply an AC power supply with regenerated secondary... | 05/09/2006 |
| 7034501 | Adjusting gate pulse time intervals for reflected wave mitigation Methods and apparatus for controlling switching in a DC-to-AC inverter to prevent overvoltages applied to an AC motor by determining the switching order of the phase voltage signals, providing gating signals at switching intervals by modulating a carrier wave with t... | 04/25/2006 |
| 7034478 | Digital spindle control architecture A three-phase spindle motor has three terminals each driven with pulse width modulated signals. Rotation of the motor is controlled by iteratively measuring an electrical period of the motor, determining a rotational position of the motor, and synchronizing the sinu... | 04/25/2006 |
| 7026786 | Reduced part count feedforward motor control A system for controlling a motor comprising: a voltage source; a motor in operable communication with an inverter, the motor responsive to a command signal from the inverter, the inverter is in operable communication with the voltage source and a controller. The inv... | 04/11/2006 |
| 7023168 | Field weakening motor control system and method A control system for an electric machine includes a flux weakening module, which includes a voltage magnitude calculator that receives d-axis and q-axis command voltages and that generates a voltage magnitude. An error circuit compares the voltage magnitude to a ref... | 04/04/2006 |
| 7023172 | Motor controller An electric motor control apparatus of this invention estimates changes in temperature of a semiconductor device to compute temperature change amplitude 108 based on an output current signal 105 computed from a current flowing through the semiconductor... | 04/04/2006 |
| 7023173 | Apparatus for driving brushless motor and method of controlling the motor An apparatus for driving a brushless motor and method of controlling the motor, which actively changes an output time of a phase commutation signal depending on variation of a load and stably operating the motor in an overloaded state and improving an operational ef... | 04/04/2006 |
| 7015671 | Circuit for operating an electric motor A circuit configuration for operating an electric motor is described, the circuit configuration containing a timer. As a function of a first differential signal between a setpoint signal and an actual value signal, a regulator supplies a first switch signal for feed... | 03/21/2006 |
| 6969963 | PWM controlled motor drive The motor driver having a plurality of output circuits each having two switching elements connected in series includes: a phase switch circuit for putting a switching element on one side of one output circuit among the plurality of output circuits in the ON state du... | 11/29/2005 |
| 6952088 | PSC motor system for use in HVAC applications with improved start-up A motor control system for use in heating, ventilation and air conditioning applications including a blower and a motor coupled to drive the blower, an inverter coupled to provide energization to the motor, a relay capable of coupling the motor to the output of the ... | 10/04/2005 |
| 6945352 | Force-based power steering system Apparatus and method is presented for enabling a power steering system comprising an accumulator, a reservoir, and an electronically controlled closed-center control valve assembly for selectively fluidly coupling the accumulator and reservoir to a double-acting pow... | 09/20/2005 |
| 6933843 | Data storage module for a security system An independent back memory module is disclosed that is permanently installed at a security gate installation. The memory module has a nonvolatile memory and it is positioned within the system so that it automatically has a communication link with any gate controller... | 08/23/2005 |
| 6927988 | Method and apparatus for measuring fault diagnostics on insulated gate bipolar transistor converter circuits A method for diagnosing faults using a load. In the method IGBTs are controlled such that certain currents are expected. If the currents are not as expected, a fault may be diagnosed. ... | 08/09/2005 |
| 6925412 | Method for adjusting a sensor device for determining the rotational position of an electronically-commutated motor rotor The invention relates to a method for adjusting a sensor device for determining the rotational position of an electronically-commutated motor with rotor and stator, where the sensor device is fitted in a specific position relative to the rotor, the increments genera... | 08/02/2005 |
| 6922028 | Controller for permanent magnet motor Disclosed is a control device of a permanent magnet electric motor which makes it possible to synchronously control the permanent magnet electric motor even when the magnetic pole logarithm of the permanent magnet electric motor is not an integral multiple of the nu... | 07/26/2005 |
| 6914399 | Active deadtime control for improved torque ripple performance in electric machines A method for implementing active deadtime control of an inverter associated with an electric motor is disclosed. In an exemplary embodiment, the method includes receiving a command voltage signal indicative of a desired load to be driven by the motor. Based upon the... | 07/05/2005 |
| 6861815 | Motor control drive circuit Embodiments of present invention may provide a motor control drive circuit for driving a motor by receiving signals from a digital signal control device. The motor control drive circuit includes a switching unit receiving signals that have undergone pulse width modu... | 03/01/2005 |
| 6819070 | Method and apparatus for controlling reflected voltage using a motor controller A method and apparatus to be used with a motor controller generating firing pulses to control an inverter, the inverter providing exciting voltage to a motor corresponding to the firing pulses, the voltage having a maximum intended amplitude, the method for substant... | 11/16/2004 |
