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| Number | Title | Issue Date |
| 7550941 | Linear-compressor control system, a method of controlling a linear compressor, a linear compressor and cooling system The present invention relates to a system of controlling a piston in a linear compressor, a method of controlling a piston in a linear compressor, as well as a linear compressor, particularly applicable to cooling systems that may include, for instance, refrigerator... | 06/23/2009 |
| 7397212 | DC motor phase estimation with phase-locked loop A DC motor phase estimation algorithm that estimates a speed-related harmonic frequency of a DC motor current under dynamic load conditions having known geometry parameters. The algorithm estimates the phase and magnitude of a complex coefficient in a complex single... | 07/08/2008 |
| 7391174 | Brushless DC motor control apparatus and control method thereof The invention relates to a brushless DC motor control apparatus controlling the number of revolutions of a brushless DC motor having a rotor with n poles (where n is a natural number) that rotates due to a supply current with m phases (where m is a natural number) s... | 06/24/2008 |
| 7382295 | Control unit for electric power steering apparatus Since an abnormality is judged by executing a square calculating process with respect to sin θ and cos θ for detecting an abnormality in an angular resolver, a processing time is elongated, and a burden to a CPU is great. Since the invention prepares a map which c... | 06/03/2008 |
| 7355436 | Method for error detection in a drive mechanism A method for error detection in a drive mechanism, having a multiphase electric motor and a converter connected upstream thereof, wherein the converter controls voltages of individual phases of the electric motor, and individual phase currents in the individual phas... | 04/08/2008 |
| 7352145 | Voltage-sensitive oscillator frequency for rotor position detection scheme A system and method is provided for improved monitoring and controlling of mechanically commutated DC motors. The system and method include DC motors, pulse-count driver circuitry for driving the motors, motor position sensing circuitry, and motor control circuitry.... | 04/01/2008 |
| 7345443 | Motor control apparatus It is an object of the invention to provide a motor control apparatus capable of ensuring a control function even for a large inertia moment ratio. In a motor control apparatus including a position detecting portion (1B) of a motor (18) for driv... | 03/18/2008 |
| 7317294 | Pulse generator and method thereof A pulse generator and method thereof. The pulse generator may include a first switching unit receiving a plurality of receiving a plurality of time interval indicators and a first selection signal. The first switching unit may select one of the plurality of time int... | 01/08/2008 |
| 7317293 | Displacement control system for a vehicle axle Provided is a motor control circuit in which the circuit structure is not complicated, which has a favorable response to the phase difference signal, and in which the signal variation caused by heat is small. This rotation control circuit of a motor includes: a PWM ... | 01/08/2008 |
| 7312594 | Control system for synchronous machine A control system for a synchronous machine including a converter for converting DC voltage to AC voltage or AC voltage to DC voltage. The synchronous machine is driven by the converter. The control system further includes a magnetic pole position presuming device fo... | 12/25/2007 |
| 7274161 | Motor driving apparatus A Motor driving apparatus adjusts activation start timing of high-side activation control signals UU, VU, WU and the low-side activation control signals UL, VL, and WL with a state determination signal SJ in an activation controller 40, in the period from sta... | 09/25/2007 |
| 7259705 | Tracking supply AC regeneration system and method A circuit for implementing tracking supply alternating current (“AC”) regeneration is described. In one embodiment, the circuit comprises a line synchronization device for converting an incoming AC signal to a square wave, wherein the square wave is precisely in... | 08/21/2007 |
| 7245106 | Controller of pulse width modulation signal-driven device, and method of reducing noise of the device A controller of a pulse width modulation signal-driven device, includes: an instruction input of operating the pulse width modulation signal-driven device; a control section generating a control clock which operates the pulse width modulation signal-driven device; a... | 07/17/2007 |
| 7239098 | Digital adaptive sensorless commutational drive controller for a brushless DC motor Various embodiments of an electrical motor, a brushless DC motor controller, and applications thereof. In one embodiment, a fluid-moving device is provided with a brushless DC motor and a motor controller. The controller may include a set of comparators and a clocke... | 07/03/2007 |
| 7190144 | System and method for adjusting a PID controller in a limited rotation motor system An adjustment system is disclosed for adjusting a proportional, integral, derivative controller in a limited rotation motor system. The adjustment system includes a first transform unit, a second transform unit, a model identification unit, and a PID adjustment unit... | 03/13/2007 |
| 7187142 | Motor drive with velocity noise filter A drive unit for controlling a motor includes a position feedback device and a velocity noise filter. The position feedback device is operable to generate a position signal relating to a position of the motor. The velocity noise filter is coupled to the position fee... | 03/06/2007 |
| 7187152 | AC servo drive without current sensor An AC servo drive without current sensor includes a PI (proportional integration) controller, at least two first-order controllers (polar point and zero point), a decoupling compensator, a coordinate converter, a pulse width modulator, a counter and a speed estimato... | 03/06/2007 |
| 7180255 | Controlling the release of a brush motor which has applied a load A method for controlling the release of a brush motor which has applied a load includes several steps. One step includes applying a release current to the brush motor to rotate the brush motor in a direction toward releasing the applied load of the brush motor. Anot... | 02/20/2007 |
| 7180257 | Method of brake pulse rejection in commutation pulse detection circuits A system and method is provided for improved monitoring and controlling of mechanically commutated DC motors. The system and method include DC motors, pulse-count driver circuitry for driving the motors, motor position sensing circuitry, and motor control circuitry.... | 02/20/2007 |
| 7171718 | Direct drive windshield wiper assembly A windshield wiper assembly including at least one motor having an output shaft and a windshield wiper operatively connected to the output shaft. The motor includes a stator adapted to provide an electromagnetic flux and a rotor assembly supported for rotation about... | 02/06/2007 |
| 7170249 | Electrical phase compensation in BEMF spindle motor control A method and apparatus for compensating for the asymmetrical phases of a spindle motor in a disc drive are provided. With the apparatus and method, compensation values are learned by sampling speed data during a period of operation of the disc drive where the speed ... | 01/30/2007 |
| 7148647 | Numerical control device An analog amplifier performs control of a motor at the speed in proportion to a speed instruction (analog voltage) outputted from a numerical control device. The speed instruction (analog value) is converted into a digital value by an A/D converter and is then sent ... | 12/12/2006 |
| 7145309 | Open loop motor parking method and system Provided herewith is an improved scheme for parking a load such as an indicator pointer and calibrating its position in a system for controlling the position of the load. The system also has a stopper for physically impeding the load when it is to be parked. In one ... | 12/05/2006 |
| 7122982 | DC motor rotation information detecting device A rotation information detection device detects rotation information of a DC motor based on a surge component waveform superimposed on a voltage waveform between the terminals of the DC motor or a current waveform of the DC motor, a circuit is provided which supplie... | 10/17/2006 |
| 7123175 | Angle detection apparatus computing phase differences between first and second phase angles A resolver use angle detection IC subjected to a phase lock operation so as to follow not an angle θ(t) for detection, but a phase angle ωot±θ(t) having an offset of a frequency ωot in the phase lock units. For this reason, when the excitation frequency ωot is... | 10/17/2006 |
| 7109670 | Motor drive with velocity-second compensation An apparatus for use with a signal generator and a motor controller includes a velocity compensator, an adjustor, and a velocity regulator. The signal generator provides a reference velocity signal, and the motor controller receives an output signal and uses the out... | 09/19/2006 |
| 7102317 | Method and apparatus to process an analog encoder signal A method and apparatus to process an analog encoder signal. The apparatus includes an analog encoder pattern generating unit, an analog encoder pattern storage unit, a digital/analog converting unit, a comparing unit, a recent state latch unit, a present state deter... | 09/05/2006 |
| 7084603 | Motor control device A motor control device that can reduce electrical noise is provided. A motor control device includes an inverter, a current controller, a high frequency wave superpositioner, and a high frequency wave setter. An inverter applies a current to the motor. A current con... | 08/01/2006 |
| 7079964 | Method for determining the frequency of the current ripple in the armature current of a commutated DC motor A method for determining the frequency of current ripples contained in the armature current signal of a commutated direct current (DC) motor includes determining frequency spectral results of the current signal and of a motor electric operating parameter. The freque... | 07/18/2006 |
| 7057995 | Digital data reproducing apparatus An apparatus has a plurality of rotary heads for reproducing digital data from a recording medium, and delays a reference signal phase-locked with the rotary heads on the basis of the detection output of predetermined reference data in the reproduced digital data, t... | 06/06/2006 |
| 7053511 | Magnetic bearing control device with counter for timed maintenance A DSP (Digital Signal Processor) (15) controls at least a magnetic bearing (23), and compares the accumulated actual work time of a managed component counted by a counter (14) with a preset maintenance time. The DSP (15) outputs a signal ... | 05/30/2006 |
| 7049778 | Inverter control apparatus and inverter control method An interrupt signal is generated at each of rising timings of PWM signals which are produced on the basis of phase-shifted triangular wave carrier signals for phases, and voltage command values for the phases. At timings of the interrupt signals, A/D conversion of m... | 05/23/2006 |
| 7030582 | Digital adaptive sensorless commutational drive controller for a brushless DC motor Devices and methods for controlling brushless, sensorless DC motors are disclosed. In one embodiment, an electrical motor is provided with a rotor, a stator, and a semiconductor on insulator (SOI) application-specific integrated circuit (ASIC). The ASIC is configure... | 04/18/2006 |
| 7023153 | Motor control device It is an object of the invention to regulate a control gain without requiring a host controller. In the invention, a command pattern generating section (14) generates a basic operation pattern for operating a motor based on various parameters such as a... | 04/04/2006 |
| 7012399 | Position detector correction method and electrically-powered steering apparatus This invention provides an electrically-powered steering apparatus capable of assisting a steering torque appropriately using a resolver. A reference signal is applied to a resolver arithmetic processing I/F circuit 34 and a resolver arithmetic processing I/F... | 03/14/2006 |
| 7005822 | Torque ripple reduction for a voltage mode motor controller A system and method for reducing torque ripple in a motor controller includes a step (60) of measuring an output voltage at each phase of the motor controller. A next step (61) includes determining a voltage mismatch between the phases. A next step ( | 02/28/2006 |
| 7000848 | Circuit configuration for fan regulation A fan regulation circuit configuration includes an input receiving an input voltage (proportional to fan current and forms a first comparison voltage), a low-pass filter (filters input voltage and a filter output voltage is tapped off as second comparison voltage), ... | 02/21/2006 |
| 7002311 | Motor speed sensor advancement emulation and compensation A microcontroller emulates advancement of a speed sensor for a motor, rather than having a physical movement of the speed sensor. The microcontroller calculates an advancement time based on the motor's efficiency. The microcontroller measures a motor speed utilizing... | 02/21/2006 |
| 6995537 | Closed-loop control system to mitigate PWM switching noise One aspect of the present invention provides a motor control system that includes a linear control system operative, in a linear mode, to provide a plurality of control signals for driving an associated motor based on an error signal. The system also includes contro... | 02/07/2006 |
| 6972534 | Delay compensation for stable current regulation when using variable-delay random PWM switching A control system for an electric machine having a rotor position sensor that generates a rotor position signal, a velocity module that generates an electric angular velocity value based on the rotor position signal, a random pulse width modulation module that genera... | 12/06/2005 |
