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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...
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7528565 |
Signal processing device, signal processing method, signal processing program, recording medium storing the program, speed detector and servomechanism
A signal processing device processes a position information signal (A sinθ, A cosθ) output from a sensor in accordance with a driving position of a motor and detects a driving speed of the motor....
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7501782 |
Method and apparatus for controlling a magnetic bearing device
A method and a controller for controlling a magnetic bearing device, in which a rotor is suspended for rotation around a shaft, are disclosed. Sensor signals are transformed to yield tilt...
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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...
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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...
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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...
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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...
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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....
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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6870346 |
Method and apparatus for controlling acceleration and velocity of a stepper motor
A method and apparatus for controlling acceleration and velocity of a stepper motor in which a phase offset is selected depending on motor velocity. The optimal phase offset indicates the position...
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6839653 |
Method for correcting the determination of the rotational position of a commutated DC motor drive shaft
A method for determining the position of an element driven by the drive shaft of a commutated direct current (DC) motor includes counting current ripples detected in an armature current signal as...
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6822414 |
Motor controller
A motor controller capable of obtaining information on offsets, amplitudes and a phase difference of analog feedback signals from encoders without using special measuring device. The analog...
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6803740 |
Method and apparatus for determining phase current of switched reluctance electric machines
A method for determining phase current for each of a plurality of individual phase coils of a switched reluctance machine (SRM) is disclosed. In an exemplary embodiment, the method includes...
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6621242 |
Motor speed control circuit having a synchronous PWM signal
A motor speed control having synchronous PWM signals has a synchronous phase detecting unit and a PWM control unit. The synchronous phase detecting unit detects the phase variation of a Hall...
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6541930 |
Method for controlling an adjustment device that is driven in an electromotorical manner and used for window lifters for instance and a device for carrying out said method
The invention relates to a method for regulating an electric-motor-driven adjusting device, in particular for vehicles, having a safety circuit ( 5 ) for reversing or stopping a drive motor, and to...
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6501403 |
Calibrated encoder multiplier
A device for receiving first and second analog signals consisting of two sinusoidal signals shifted in phase from an encoder and outputting digital pulses corresponding to the approximate number of...
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6489740 |
Spindle motor control method of optical disk recording and reproducing apparatus
To provide a spindle motor control method adapted to an optical disk recording and reproducing apparatus capable of recording a signal onto a disk using a laser applied from an optical pick-up, a...
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6487458 |
Adaptive closed-loop servo control
A closed-loop control of a servo motor in which multiple closed-loop terms of a motor command are adaptively tuned and selectively activated to achieve both stable operation and improved...
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6479956 |
Brushless motor control device and equipment using the control device
The present invention supplies a position detection circuit, and a motor controller, that can not only obtain rotor position detection signals properly over the entire PWM control region, but also...
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6400107 |
Motor control device capable of driving a synchronous motor with high efficiency and high reliability
A control unit is arranged for a synchronous motor formed of a rotor provided with a magnet. The control unit includes a 180°-conduction drive unit for performing 180°-conduction drive of the...
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6369540 |
Bypass circuit for use in DC brush motor control
A circuit to bypass the Zener diodes in the flyback circuit of a DC brush motor actuator which uses a voltage sensitive device to detect when the power to the motor is de-activated to control a...
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6366047 |
Multi-track absolute encoder
A position encoder and a method for estimating absolute position using two or more diffractive grating tracks of differing periods to generate interference fringe patterns on a multi-track sensor....
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6359402 |
Method and system for determining movement of a motor in a vehicle power window system
A method and system for detecting a change in the position of an electric drive motor in a vehicle power window system includes a current sensor for sensing a current of the motor, and generating...
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6356523 |
Apparatus for reproducing information recorded on optical disc
An apparatus for reproducing information recorded on an optical disc which can favorably accomplish a time base correction for a read signal in a simple configuration. Also, the apparatus precisely...
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6326757 |
Rotational pulse generating circuit for commutator DC motors
A rotational pulse signal generating circuit for a commutator DC motor is made up of a filter device for eliminating noise from the motor, a cutoff frequency of the filter device being variable...
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6274995 |
Method and circuit arrangement for automatically parameterizing a quick-acting digital speed control loop
A filter module inserted into a speed control loop to shorten the rise time of the loop. The filter parameters of the filters provided in the filter module and the controller parameters are...
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6262546 |
Variable threshold motor commutation pulse detection circuit
An improved motor commutation pulse detection circuit for comparing a filtered motor current signal to a threshold value, where the circuit is responsive to the actual or expected amplitude of the...
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6249100 |
Drive circuit and method for an electric actuator with spring return
A spring return rotary actuator incorporating a DC brush commutated electric motor and a pulse width modulation drive circuit which reduces the voltage at which current is supplied to the motor...
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6242882 |
Motor control apparatus
The present invention addresses a problem as to how to provide a motor control apparatus which has a magnetic pole position inferring means capable of inferring the position of a magnetic pole of a...
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6194861 |
Circuit and method for sensorless brushless direct current (BLDC) motor
A circuit for driving a sensorless BLDC motor is disclosed which checks whether or not the motor is rotating and then terminates the start up interval (or forced drive interval) in order to obtain...
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6166507 |
Disk drive system
In a disk drive system, whether the rotation rate of a motor provided to drive a disk is within a rated rotation rate range or not is checked every time the motor makes one complete turn. When the...
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6163118 |
Method and apparatus for controlling a motor in a mass storage device
A method of detecting phase error between a phase current and a driving voltage includes generating a signal indicative of the phase current. The method includes identifying a time interval during...
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6133706 |
Printer subsystem motion-control sensor apparatus
In accordance with the described invention, a stepper motor that drives a printer's movable subsystem, e.g. a sled-mounted ink-jet service station, is replaced with a less expensive and quieter DC...
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6121736 |
Control apparatus for motor, and motor unit having the control apparatus
A motor control apparatus and a motor unit having such a motor control apparatus according to the present invention are constructed to detect a terminal voltage for switching elements of the same...
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6111333 |
Magnetic bearing, rotating machine mounting the same, and method for driving rotating machine
In a rotating machine with employment of a sensor-less DC brushless motor, a terminal voltage of a motor is corrected in a phase corrector by using a motor phase current signal. At this time, the...
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6100661 |
Time-discrete phase-locked loop
A time-discrete phase-locked loop includes a discrete time oscillator (DTO) which supplies a periodical oscillator signal (OS) representing oscillator values (OV) at corresponding clock instants...
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6037735 |
Slow-speed servomechanism
A slow-speed servomechanism includes a motor for driving a load; a direct drive transmission between the motor and the load; an incremental optical encoder connected to the load, the encoder having...
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5936368 |
Non-linear proportional/integral feedback controller
A simple modification to a proportional integral controller allows for non-linear control strategies while maintaining the simplicity of set up and tuning of the loop through modifying the...
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5920173 |
Feedback enhanced adaptively tuned vibration absorber
An apparatus has a mass suspended between two mounting plates by a separate springs to form a resonant structure that absorbs vibration in a structural member to which the mounting plates are...
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5914578 |
Method and systems for electrical drive control
An electrical drive control system includes a controlled drive, an auxiliary generator, a control unit, and a power unit. The rotors of the controlled drive and of the auxiliary generator are...
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5905350 |
Position measuring system and measuring process
A position measuring system to determine the absolute angle position of a rotor of a motor during startup. With this absolute angle position, correct commutation for startup of the motor is...
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