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7638959 |
Method of operating a brushless motor wherein open loop and closed loop controllers utilize different commutation methods
A motor control is provided with both open loop and closed loop controllers. The open loop and closed loop controllers provide commutation signals back to gate drives for an inverter, wherein the...
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7619385 |
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...
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7595603 |
Method and device for regulating a pump
Electronic motor regulation for a pump with a multi-phase permanent-magnet synchronous motor (PMSM). The system is enabled to detect and estimate a rotor phase position and rotary speed. Foam or...
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7560893 |
Dual mode stepper motor
A method and structure receives a desired rotational speed and/or step frequency for an electric motor. If the desired rotational speed is above a predetermined limit, the method performs...
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7554280 |
Monitoring device of rotor position of an electric motor and corresponding method
A monitoring device for an electric motor has in input a signal representing zero crossings of the back-electromotive force of the motor and comprises a monitor that detects the signal in first...
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7526693 |
Initial decision-point circuit operation mode
A circuit that includes a controller and at least one control I/O pin. When the controller is placed into an initial state, the controller initializes the circuit into an initial operation mode....
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7514887 |
Electrical machine and method of controlling the same
An electrical machine having a stator and a rotor. The stator includes a core and a plurality of windings disposed on the core in a multiple-phase arrangement. The rotor is disposed adjacent to the...
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7479747 |
Storage device and motor control device
In a storage device, a BEMF control is not performed on a motor and the motor is stopped if the motor is in a BEMF-control possible state. Once the motor has completely stopped, a start-up control...
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7477032 |
Compressor and a driving method thereof
A compressor having a sensorless motor and a driving method thereof. The compressor includes a sensorless motor having a rotation shaft connected to a rotator, a piston for performing a compression...
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7466093 |
Motor drive unit and electric apparatus having a motor
A motor drive unit capable of detecting the position of a stationary rotor of any type of sensorless motor, determining a proper startup logic for the rotor, and starting up the motor in a stable...
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7411365 |
Drive control device of motor and a method of start-up
A drive control device of motor capable of starting up even a motor of such a type that the polarity of induced voltage does not switch every 180° of electrical angle or the polarity, positive or...
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7334854 |
Sensorless start-up method for driving a brushless DC motor
At first, a plurality of detection modes are applied in sequence to a brushless DC motor, such that with respect to each of the detection modes a composite magnetic field generated by a motor...
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7321210 |
Sensorless brushless direct current motor drive using pulse width modulation speed control at motor frequency
Disclosed is a variable speed brushless direct current (BLDC) motor drive circuit. The circuit includes a plurality of high-side and low-side controlled switches coupled in a three-phase bridge...
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7245097 |
Motor control system and vacuum pump equipped with the motor control system
A motor control system has a rotary member, a motor for imparting a torque to the rotary member, a motor driving circuit for supplying power to the motor, and a drive control circuit for...
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7245096 |
Method and apparatus for controlling the speed of a DC motor
A method and apparatus for controlling the speed of a DC electric motor receives a periodic commutation signal having a fixed duration on cycle and an off cycle. The commutation signal then is...
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7242160 |
Starting method for Hall-less single-phase BLDCM
The methods for starting a Hall-less single-phase BLDCM having an asymmetrical air gap are proposed. The provided methods are employed to input a specific amount of current impulse and stop the...
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7230400 |
Electronically commutated motor
In an electronically commutated motor (M), rotor position signals are generated by means of a galvanomagnetic rotor position sensor ( 40 ). A timer (CNT_HL) brings about an advanced commutation...
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7230397 |
Sensorless motor driving device
In a sensorless motor driving device for driving a motor by controlling the energization of the coils of individual phases of the motor according to the result of detecting the position of the...
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7218072 |
Motor driving device, motor to be driven by the same device, and apparatus using the same motor
A motor driving device includes a motor having three-phase driving coils, a power feeder for powering the coils, and a power feeding controller for controlling a power feeding method. The...
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7215091 |
Method for controlling a DC printer motor with a motor driver
A method of the invention is for controlling a DC printer motor with a motor driver during a potential stall of the DC printer motor. One step of the method includes detecting the start of the...
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7205733 |
Self-startup circuit for DC fan
A self-startup circuit for a DC fan includes a voltage sampling device receiving a first control signal, a comparator, and a self-startup device. The comparator includes two input terminals and an...
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7202623 |
Startup procedure for sensorless brushless DC motor
A method for starting-up a motor having multiple stator windings and a rotor contains first providing current to two of the windings to excite a predefined phase and allowing one of the windings...
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7193804 |
Method and apparatus for controlling head velocity in a disk drive during ramp load/unload
A disk drive controls head velocity during ramp load/unload by measuring voltages across a VCM and a sense resistor in series with the VCM, calculating a back EMF voltage using the VCM and sense...
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7190131 |
Device and method for starting brushless direct current motor
A Brushless Direct Current (BLDC) motor starting method and device are provided. With the method and/or device, startup noise and vibration and startup failure rate can be reduced using a constant...
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7141952 |
Determination of start commutation in synchronous servo-drives
Method for the determination of start commutation in synchronous servo-drives by means of two coupled control loops, a current control circuit and an angle control circuit. The angle control...
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7122980 |
Motor driving apparatus and motor driving method
A motor driving apparatus includes a comparator, a threshold controller, a position determining unit, a phase-switching controller, and a current output unit. While the rotor is stopped, the...
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7116070 |
System and method for sensor less magnetic field control of a motor
A system and method for sensor less control of a stepper motor is described. The system and method includes estimation of the position of a rotor of the motor by way of sensing circuitry on the...
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7109673 |
Apparatus and method of controlling motor in manner resistant to additive noise during start up of motor
An apparatus for controlling a rotational motion of a motor is disclosed which includes: a signal generator generating a rotational state signal indicative of a rotational state of the motor; and a...
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7084598 |
Driver of electric compressor
A compressor driver for a compressor is provided, wherein at the start of the compressor, a phase of the current flowing in the motor is controlled to be ahead of an induction voltage, then the...
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7075261 |
Method and apparatus for controlling a fan
A method and apparatus for controlling a fan is disclosed. In one embodiment, a method for controlling a fan includes applying power to the fan at startup. The fan may be supplied a predetermined...
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7023158 |
Motor control apparatus
A motor control apparatus capable of easily and reliably determining the completion of starting of a synchronous motor and not requiring an arithmetic unit having high processing ability for the...
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6984951 |
Drive assembly for a covering of an architectural opening
An electrically-operated architectural covering that can be powered by a low current or voltage source includes a motor, an accumulator connected to the motor, a power source, and an electrical...
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6946808 |
Motor drive control circuit and motor drive apparatus
Conventional position-sensorless motor drive control circuits start a motor by a method that has the disadvantage that the motor is not always started in the forward direction or by a method that...
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6940242 |
Motor control system for dynamically changing motor energization current waveform profiles
A control system is provided for a multiphase motor having a plurality of stator phase components, each stator phase component comprising a phase winding formed on a core element, and a rotor. A...
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6922029 |
DC motor driver
In a DC motor driven by sinewave power-on driving and having hall elements shift-mounted relative to a stator for detecting the position of a rotor, a reduction in starting torque is eliminated by...
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6894450 |
Circuit configuration for permanent magnet synchronous motor control
Circuits and methods for use with an integrated circuit chip having internal back EMF estimation to control a permanent magnet synchronous motor includes an AC current feedback circuit, a scaling...
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6885163 |
Method for starting a brushless d.c. motor
A process to start a brushless direct current motor with a multiphase stator winding is disclosed, in which, during rotor standstill, a plurality of current impulses is intruded on the stator...
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6838842 |
Method for operating a brushless direct current motor
A brushless, synchronous direct current motor is operated by supplying a direct current voltage as an input voltage for commutating the motor phase windings. The speed of the synchronous motor is...
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6774592 |
Method and system for controlling a permanent magnet machine
Method and system for controlling a permanent magnet machine are provided. The method provides a sensor assembly for sensing rotor sector position relative to a plurality of angular sectors. The...
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6741047 |
Dual current-limiting circuit for DC brushless motor
A dual current-limiting circuit for a dc brushless motor includes an over-current detective circuit, an operation detective circuit, and a current-limiting circuit. The over-current detective...
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6741046 |
Method for starting a sensor- and brushless d.c. motor
A method is for starting a sensorless and brushless direct current motor, the stator windings of which are supplied with power from a multiphase converter circuit. For starting the motor, it is...
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6741049 |
Low voltage start up circuit for brushless DC motors
A local oscillator and logic circuit pulses the open winding of a brushless DC motor at start up and the back EMF is used to generate a voltage to boost the voltage available to the control circuit...
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6690129 |
Electronically commutable motor
An electronically commutatable motor, whose excitation windings are controllable via semiconductor output stages by an electronic control unit with the aid of PWM control signals, a setpoint value...
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6653805 |
Method and apparatus for spinning a multiphase motor for a disk drive system from an inactive state
A method and apparatus are disclosed for controlling the operation of a multiphase motor, and particular to spinning the motor from an inactive state to an operable state. The method and apparatus...
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6639371 |
Method and system for controlling start of a permanent magnet machine
Method and system for controlling a permanent magnet machine are provided. The method provides a sensor assembly for sensing rotor sector position relative to a plurality of angular sectors. The...
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6597135 |
Combination of resistor and PWM electronic device to control speed of a permanent magnet DC motor
A motor speed control system 10 includes a permanent magnet direct current electric motor 12. A first switch 14 is operatively associated with the motor. A resistive element 16 is provided...
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6538404 |
Motor apparatus
A motor apparatus, such as a DC brushless motor, is provided for the obtaining a position detection signal by detecting the intersection of the divided voltage of a bus voltage and three phases of...
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6538403 |
Brushless DC motor sensor control system and method
A system and method for controlling a brushless DC motor ( 58 ) is provided. The motor ( 58 ) includes a rotor ( 72 ) and a stator ( 96 ) having at least three phases. The rotor ( 72 ) is...
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6534936 |
Disk drive employing method of spinning up spindle motor including detecting BEMF polarity change for selecting initial commutation state
A disk drive is connectable to a power supply voltage and includes a spindle motor, a spindle motor driver, a spindle motor controller, and a detector. The spindle motor has windings and a...
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6459220 |
Spindle-motor control method, spindle-motor control device, spindle-motor drive circuit and disk device
This invention relates to a control method, control device, and drive circuit for controlling the rpm of a spindle motor in order to reduce the rise time of the spindle motor. There is a discharge...
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