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7336044 |
Direct current motor control circuit
A DC motor control circuit includes a pair of substantially identical unipolar control circuits. Each of the unipolar control circuits are connected between a respective current source and a...
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7301294 |
Motor speed control integrated circuit
A motor speed control integrated circuit which controls a rotational speed of a motor by controlling the amount of current flowing through a drive coil of the motor. The integrated circuit...
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7291996 |
Optical disc drive and brake control method thereof
An optical disc drive 1 includes a spindle motor 11 for rotating the optical disc 2 and a spindle driver for driving the spindle motor 11 equipped with a rotation number counter 232 for...
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7268441 |
Control device for motor generator
In the control device for motor generator in which an engine is started and power generation is performed while a vehicle is running, a field current limit value Ifm in electric driving to start...
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7265505 |
Control apparatus for selectively driving plural stator windings of synchronous motor
A control apparatus for a synchronous motor such as a switched reluctance motor, having a plurality of respectively separate stator windings, can operate the motor in either a normal mode or a...
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7245098 |
Brushless dc motor having a motor-locked protective circuit
A brushless dc motor includes a PWM drive IC member, a Hall IC member, a PWM converter circuit and a Rotational Detection (RD) signal line. The PWM drive IC member electrically connects with the...
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7208911 |
Method for controlling a cycle-skipping control system including computer readable code and controller for performing such method
A method, computer-readable code, and controller are provided for controlling a cycle-skipping control system having at least one cycle skipper connected to a multi-phase AC (alternating current)...
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7208907 |
System and method of restarting a switched reluctance motor after a rapid cycling of power
A system and method of restarting a switched reluctance motor after a cycling of power provided to the motor is provided that includes receiving at the motor a power-off signal followed by a...
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7208895 |
Control systems and methods for permanent magnet rotating machines
Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a...
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7205738 |
Method and apparatus for time-based dc motor commutation
A motor control circuit uses a stored commutation table to effect time-based commutation of a brushless dc motor. Each entry in the commutation table defines a motor winding commutation state, and...
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7184927 |
Adaptive position sensing method and apparatus for synchronous motor generator system
An adaptive, sensorless position sensing apparatus ( 250 ) derives rotor position of a synchronous machine ( 200 ). The apparatus ( 250 ) comprises a first rotor position deriving unit ( 300 ) for...
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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...
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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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7170243 |
Drive method for brushless motor and drive control apparatus therefor
A drive method for a brushless motor and a drive control apparatus therefor, in which control parameters are calculated by revolution number control means or motor current control means in...
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7158329 |
Disk drive employing active braking using inductive sense
A disk drive is disclosed comprising a disk, a head actuated over the disk, and a spindle motor for rotating the disk, the spindle motor comprising a plurality of windings. Disk control circuitry...
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7145303 |
Method for the commutation of a brushless direct current motor
The invention relates to a method for the commutation of a brushless direct current motor in which the position of the rotor in respect of the stator is determined directly or indirectly and an...
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7141950 |
Fan control utilizing bi-directional communication
A system and method for bi-directional communication between a system controller and a fan controller: The system operates in two modes and there are two communication paths between the system...
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7134290 |
Phase correction method and apparatus
In a transport refrigeration system which is susceptible to having its drive motors connected to a power source in reverse phase relationship to thereby operate the drive motors in reverse,...
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7122979 |
Method and apparatus for selective operation of a hybrid electric vehicle in various driving modes
A hybrid electric vehicle and method that stores an upper energy storage limit and a lower energy storage limit for an energy storage system for each of a plurality of predetermined driving modes,...
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7116067 |
Power converter controlling apparatus and method providing ride through capability during power interruption in a motor drive system
A method of controlling a power converter ( 20 ) of a motor drive system ( 10 )controls the power converter ( 20 ) during a first operating mode by applying a current control scheme, which sets...
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7095201 |
Method and apparatus for providing a user selectable start-up current in a disk drive
A method and apparatus for providing a user selectable start-up current in a disk drive are provided. A user may select a relatively high start-up current to provide a relatively fast start-up time...
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7042188 |
Servo motor with a built-in drive circuit
A servo motor with a built-in drive circuit is provided in which, when power is off, positional data including multiple-rotation counting values is stored in a nonvolatile memory to thereby...
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7012387 |
Circuit that eliminates the sneak path for dual-speed DC motors
A system for controlling a dual-speed motor includes a direct current (DC) power supply, a dual-speed DC motor, a first solid-state switch electrically coupled to the DC power supply and a...
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7005817 |
Energy conserving disc drive
A disc drive includes a disc mounted to a rotatable spindle, a motor coupled to the spindle, and motor control circuitry. The motor has a motoring mode in which it rotates the spindle and a braking...
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6979976 |
Driving apparatus for driving a brushless motor
A driving system for driving a brushless motor effects a rotation control of a rotor by sequentially switching application of a current to magnetic coils disposed in a stator in response to a...
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6975082 |
Variable speed drive with a synchronous electric motor
This invention relates to a variable speed drive with synchronous AC motor. In the disclosed embodiment, a variable speed drive operates in three modes: a first predetermined mode, in which a...
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6903523 |
Methods and apparatus for dynamically reconfiguring a pulse width modulation approach
An apparatus includes a driver circuit including electronic switches operable to deliver voltage and current to a polyphase motor; and a control circuit operable to provide driver control signals...
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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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6873125 |
Motor driving apparatus and motor using the same
A motor driving apparatus includes a pulse-width modulator and a PWM frequency switch for switching a carrier frequency of the modulator. The PWM frequency switch changes a carrier frequency in a...
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6791288 |
Appliance control methods and apparatus
An appliance includes a rotating position switch and a selector switch. The rotating position switch has a first position associated with a first appliance function and a second position associated...
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6777897 |
Motor control apparatus and motor control method
When a switch between sine wave voltage drive and rectangular wave voltage drive is effected based upon the motor rotation speed and a motor torque command value, an AC voltage forming an...
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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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6762574 |
Brushless motor, control method for brushless motor, light deflection device, and control method for light deflection device
The invention concerns a light deflection device, and a control method for the light deflection device, which are rich in expandability of drive control. The light deflection device includes a...
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6713977 |
Electronically commutated 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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6710558 |
Electronically commutable motor, in particular, for a liquid pump
An electronically commutatable motor, in particular for a fluid pump, includes excitation windings that may be connected to and disconnected from a DC supply voltage via semiconductor switches that...
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6696804 |
Electronically commutatable motor comprising an electronic control unit
An electronically commutatable motor is disclosed, whose field windings are controllable via electronic control unit using PWM control signals via semiconductor output stages, a setpoint being...
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6680997 |
System and method for enabling a high torque/high speed brushless DC motor
A high torque/high speed brushless DC motor system for controlling both the speed and torque of the motor including a rotor and a stator, the stator of the motor including a first, second and third...
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6680596 |
Electric motor having regenerative braking
An electric motor having a regenerative braking capability is described which has several embodiments, each of which utilize two pairs of brushes, each pair of which has individual brushes...
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6664749 |
Spindle motor initialization after a control processor reset condition in a disc drive
Method and apparatus for initializing a disc drive to bring a spindle motor to a final, operational velocity after a disc drive processor reset condition. The spindle motor is rotated using...
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6661190 |
Controller and associated drive assembly controlling a brushless direct current motor
A controller for controlling a BLDC motor controller includes a drive assembly, and a processing element. The processing element is in electrical communication with the drive assembly and the BLDC...
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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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6642683 |
Controller and associated drive assembly for power sharing, time sliced control of a brushless direct current motor
A controller for controlling a BLDC motor controller includes a drive assembly, and a processing element. The processing element is in electrical communication with the drive assembly and the BLDC...
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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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6633144 |
System and method for measuring parameters of a DC motor field
A system and method determine the parameters of a field of a DC motor. The method comprises obtaining parameters of the DC motor; and performing an iterative processing loop, the iterative...
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6628096 |
Linear sinusoidal waveform spindle driver and method for driving a polyphase, brushless DC motor using commutation currents with user controlled rise and fall times
A circuit and method for providing drive currents to a polyphase dc motor are presented. The circuit ( 40 ) includes a circuit for generating a user-defined waveform first. signal in synchronism...
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6624602 |
Motor driving apparatus
A pulse signal is output from a position detector or the like provided on an object to be driven by the motor as the object to be driven travels, and the commutation of the motor is controlled on...
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6605912 |
Method for controlling a permanent magnet motor
A three region control strategy for a permanent magnet motor is presented. In a first control region, the permanent magnet motor is operated at, a 120° conduction square wave mode at reduced phase...
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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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6586896 |
Method and apparatus for improved transition from pulse width modulation to linear control
A method and a circuit for switching a motor controller from pulse width modulation to linear control for a brush-less, sensor-less, poly-phase DC motor. The method includes steps of operating a...
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6577088 |
Closed loop spindle motor acceleration control in a disc drive
Method and apparatus for accelerating a disc drive spindle motor from rest to a final operational velocity. During a low gear mode, the spindle motor is accelerated from rest to a first velocity...
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