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| Number | Title | Issue Date |
| 7443131 | Control device for electric power steering apparatus A control device for electric power steering apparatus, in which when torque ripples at the time of the rotation of a motor is reduced by simple arithmetic, smooth and safe assist limitation is performed without deteriorating steering feeling, is provided. For this ... | 10/28/2008 |
| 7388347 | Method and inverter for controlling a direct current motor A three-phase direct-current motor is controlled by cyclically repeating three first switching states. In each of the three first switching states, one of the three phases of the direct-current motor is periodically switched over between a first and a second input v... | 06/17/2008 |
| 7365508 | Motor, actuator and controller thereof A motor comprises: coil on/off switching devices for switching between an on-state wherein current is supplied to the coils, and a first off-state wherein the coil terminals are open-circuited or a second off-state wherein the coil terminals are short-circuited; and... | 04/29/2008 |
| 7295097 | Energy saving system for a unit requiring electricity An electrical energy saving device or a magnetic induction device is adapted to surround a power delivery line. The magnetic induction device applies a magnetic field region to the power delivery line to reduce amperage up to about 25%. The magnetic induction device... | 11/13/2007 |
| 7271565 | Apparatus for controlling speed of fan motor of air-conditioner An apparatus for controlling a speed of a fan motor (HIM (Hybrid Induction Motor)) of an air-conditioner extends a speed control range of a fan motor of an air-conditioner by controlling revolutions per minute (RPM) of the fan motor. In order to extend the speed con... | 09/18/2007 |
| 7272302 | PSC motor system for use in HVAC applications with field adjustment and fail-safe capabilities A field-adjustable motor control system includes a motor, an inverter coupled to provide energization to the motor, a controller coupled to the inverter, and a field adjustment circuit that provides field adjustment signals to the controller. The controller provides... | 09/18/2007 |
| 7176674 | Measurement of energy by means of a frequency converter A method and system for the measurement of energy in an alternating-current motor drive containing a frequency converter or an equivalent stepless rotational speed regulator provided with semiconductor switches. In this regulator, the power taken by the motor drive ... | 02/13/2007 |
| 7081728 | Apparatus for controlling heat generation and recovery in an induction motor An induction motor system comprising an induction motor, equipped with a heat recovery and water pumping apparatus and an apparatus for controlling the electrical efficiency and resulting heat generation of the induction motor. The motor is adapted to be coupled to ... | 07/25/2006 |
| 7071650 | Synchronous induction motor and electric hermetic compressor using the same A synchronous induction motor has a stator having a main winding and an auxiliary winding; a rotor having a yoke, a permanent magnet embedded in the yoke and a secondary conductor provided in the vicinity of periphery of the yoke; and a starter. The starter has a st... | 07/04/2006 |
| 7064517 | Motor driving apparatus for use in a dishwasher An apparatus for driving a motor of a dishwasher includes an AC power source, a rectification circuit for converting an AC power from the AC power source to a DC power, an inverter circuit for converting the DC power from the rectification circuit to an AC power, a ... | 06/20/2006 |
| 6940249 | Inverter device An inverter device capable of smoothly driving an alternating current synchronous motor of large capacity and high-speed rotation is provided. The inverter device includes a power rectification main circuit for converting alternating current power into direct curren... | 09/06/2005 |
| 6909263 | Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the p... | 06/21/2005 |
| 6909258 | Circuit device for driving an AC electric load A circuit device is provided for driving an AC electric load, of the type inserted between a terminal of an AC power supply line and a terminal of the electric load to be driven and including a generator of PWM signals to be transferred to the load. This circuit is ... | 06/21/2005 |
| 6879130 | Controller for induction motor A controller for a vector control of an induction motor, which is capable of easily determining a rotor resistance for use in calculation of a slip frequency. A temperature sensor is provided for detecting a temperature of a stator. Information on relation between t... | 04/12/2005 |
| 6777907 | Current ripple reduction by harmonic current regulation A method and apparatus for regulating a harmonic current component of an inverter fed motor drive system comprises measuring a phase current of the motor, substantially eliminating the fundamental component of the phase current, demodulating the phase current having... | 08/17/2004 |
| 6686719 | Electric golf car with low-speed regenerative braking A control system for an electric vehicle, such as a golf car, that includes a plurality of power MOSFETs. The vehicle includes a shunt wound motor including an armature coil and a field coil. One of the MOSFETs is connected in parallel across the armature... | 02/03/2004 |
| 6670782 | Stepping motor driver A stepping motor driver having current sensors that detect winding current values, an angle detection device that detects a rotational angle of a rotor, a first coordinate transformation device that transforms winding current values in a rotational coordi... | 12/30/2003 |
| 6552508 | Apparatus and method for optimally controlling flux in an AC motor A method and apparatus for controlling flux in an induction motor. During initial start of an induction motor drive the motor flux has to be charged up. The method provides time optimal flux forcing under limited inverter ampere capability. Command stator... | 04/22/2003 |
| 6509711 | Digital rotor flux observer A system (10) for controlling the torque of an induction motor (12) utilizes a flux observer (14). The flux observer (14) receives stator current inputs (16, 18) and a rotor speed estimate (80) and then outputs a rotor flux estimate (20) that provides inc... | 01/21/2003 |
| 6462506 | Electric golf car with low-speed regenerative braking A control system for an electric vehicle, such as a golf car, that includes a plurality of power MOSFETs. The vehicle includes a shunt wound motor including an armature coil and a field coil. One of the MOSFETs is connected in parallel across the armature... | 10/08/2002 |
| 6377017 | Control device for alternating current motor A control device for an alternating current motor includes: a target current generating unit which generates a current order value, based on a torque order, as a d-axis target current and a q-axis target current on dq coordinates; a current detection devi... | 04/23/2002 |
| 6346790 | Induction motor system with an induction motor and an electrically isolated voltage modulation motor controller An induction motor system operable in a wet environment comprises an induction motor and an apparatus for controlling the speed of the motor. The motor is adapted to be coupled to an AC source for supplying an AC signal. The motor includes a rotor having ... | 02/12/2002 |
| 6208098 | Variable frequency drive noise attenuation circuit A noise attenuation circuit is disclosed for use in a motor drive system. The motor drive system includes a pulse width modulated inverter providing three phase power output on three phase conductors for driving a motor. The noise attenuation circuit incl... | 03/27/2001 |
| 6069467 | Sensorless rotor tracking of induction machines with asymmetrical rotor resistance A drive system for providing ac drive power to an induction machine with asymmetrical rotor resistance and for sensorless rotor tracking of the induction machine includes: a signal injector for determining a stator command signal in a reference frame whic... | 05/30/2000 |
| 5909098 | Downhole pumping system with variable speed pulse-width modulated inverter coupled to electrical motor via non-gap transformer An improved downhole pumping system that employs a variable speed PWM inverter and a non-gap transformer to drive an induction motor over a range of different speeds, without saturating the transformer. The variable speed PWM inverter provides a rectangul... | 06/01/1999 |
| 5852349 | Driver circuit apparatus for driving a three-phase motor with a single magneto-sensitive device An integrated circuit for driving a three-phase motor in response to a single signal of the three-phase signals to be applied to stator coils of the motor. The circuit comprises a first amplifier for amplifying the single signal on the basis of a first in... | 12/22/1998 |
| 5847524 | Constant speed control for a motor A motor having a power switching circuit adapted to be connected between a power source and its winding for selectively energizing the winding to generate a magnetic field which causes a rotating assembly to rotate. A position sensing circuit provides a p... | 12/08/1998 |
| 5847534 | Control system for electric vehicle The control system is constructed so that an inverter output frequency command is increased/decreased based on a frequency-to-time rate-of-change command, and the frequency-to-time rate-of-change command is controlled with a current control system. Furthe... | 12/08/1998 |
| 5847535 | Active electronic damping for step motor Apparatus for electronically producing a torque dependent signal for a plural drive phase synchronous step motor, without the use of an accelerometer or other external feedback device, includes a circuit for detecting respective instantaneous terminal vol... | 12/08/1998 |
| 5844397 | Downhole pumping system with variable speed pulse width modulated inverter coupled to electrical motor via non-gap transformer An improved downhole pumping system that employs a variable speed PWM inverter and a non-gap transformer to drive an induction motor over a range of different speeds, without saturating the transformer. The variable speed PWM inverter provides a rectangul... | 12/01/1998 |
| 5838124 | Systems and methods for braking of actuator and brushless DC motor therein A brushless DC motor is controlled by determining a speed of the motor and a line voltage supplying drivers of the motor. Based upon these determined values and predetermined motor performance data, a maximum PWM on-time is determined for drive signals su... | 11/17/1998 |
| 5831405 | High precision fan control/alarm circuit A motor speed control circuit includes a temperature sensor providing a first voltage output which is proportional to the temperature and a control voltage generator having an internal voltage reference receiving the first output as an input. The control ... | 11/03/1998 |
| 5828199 | Variable speed controller for an induction motor A variable speed controller for an induction motor that estimates the primary angular frequency and the speed without causing any error in the drive region where the induced voltage is low. The primary angular frequency and speed estimating device include... | 10/27/1998 |
| 5821714 | Improvements in and relating to motors A commutation control strategy for eliminating torque ripple and noise from a brushless motor which has a plurality of motor phases connected in a bridge, each phase having a top switching device provided between a phase winding and a positive voltage sup... | 10/13/1998 |
| 5821725 | Electric current compensation circuit for brushless motors for reducing ripples in output torques during phase change An electric current compensation circuit for use with a multiple-phase burshless motor to reduce ripples in the output torque is disclosed. It contains a plurality of electric current compensation loops each for a respective phase winding and each of the ... | 10/13/1998 |
| 5818187 | Motor and control for windshield wiper system The invention concerns an improved system for windshield wipers in vehicles. An induction motor is used, in which speed is accurately controlled by controlling frequency of power supplied to the motor. The induction motor may be of the consequent-pole typ... | 10/06/1998 |
| 5818180 | Voice coil motor feedback control circuit A circuit for driving a voice coil motor used to position the heads of a disk drive is disclosed. The circuit consists of a an H-bridge circuit, a controller, and a feedback loop. The feedback loop prevents the BEMF from driving a voltage on the voice coi... | 10/06/1998 |
| 5801505 | Disk drive stiction release system A disk drive including firmware for overcoming stiction and breaking free the heads of a disk drive which may adhere to the disk surface when the disk is at rest. Upon start-up of the disk drive, if stiction at the head/disk interface occurs, the voltage ... | 09/01/1998 |
| 5786681 | Active phase coil inductance sensing A method and circuit are disclosed for commutating a conduction cycle of a motor phase of a switched reluctance motor having a rotor portion thereof. The circuit includes a first switching device and a second switching device connected in series with a ph... | 07/28/1998 |
| 5783924 | Drive system comprising a motor, control means for controlling the motor, apparatus comprising the drive system, and method of controlling the motor The drive system (210) comprises an electronically commutated motor (220) having three windings (225, 226 and 227). The motor (220) is energized by an energizing circuit (270). The energizing means (270) is controlled by three Hall elements (241, 242 and ... | 07/21/1998 |
