Matches 101 - 150 out of 216 < 1 2 3 4 5 >


Match Document Document Title
8159164 Variable-delay-time control system for a motor  
A variable-delay-time control system for a motor is provided. The system includes a control unit, a driving unit, and a motor. The control unit is used to output at least one control signal...
8138699 Power control system for vehicle disk motor  
A brushless D.C. disk motor has one or more disk rotor assemblies and pairs of stator assemblies for each rotor assembly. Each disk rotor assembly has a disk and a plurality of permanent magnets...
8115434 High-speed self-cascaded electric machine  
An electric machine is disclosed comprising a first energy source, a second energy source, and a stator which comprises a first set of windings and a second set of windings. The electric machine...
8080955 Driving method and related driving device for a motor  
A driving method for a motor includes sensing variation of magnetic pole of a rotator of the motor, to generate a magnetic pole sensing signal, determining dead zone of the motor according to the...
8076877 System and method for controlling power balance in an electrical/mechanical system  
An electrically commutated actuator and control system has a stator and a shaft that is movable with respect to the stator. A plurality of magnets movable with the shaft provide a first magnetic...
8076895 Method and device for generating signals for controlling multi-phased rotating electric motor  
A method wherein the signals (SW1, Sw2, Sw3) controlling the power supply (10) of the phase windings (4) of the motor consist of signals (So1, So2, So3) that are out-of-phase by a phase angle (f)...
8049446 Motor control device and magnetic pole position estimation precision confirming method  
A motor control device includes a dq-axis current control unit for generating a dq-axis voltage reference based on a dq-axis current reference and a dq-axis current signal, an initial magnetic...
8049363 Motor drive circuit  
A motor drive circuit comprises positive and negative input terminals for connection of the motor circuit to a DC supply, a DC link filter connected between the input terminals: an electric motor...
8044619 Prevention of concurrent PWM or PSM commutations of power signals driving a voice coil motor (VCM) to reduce S/N ratio degradation of low level signal lines of a R/W head  
A method of preventing concurrent or quasi-concurrent commutations of a pair of phase shift modulation (PSM) drive signals of an output bridge stage driving an electrical load includes...
8040090 Brushless motor controller and brushless motor  
A brushless motor controller that controls a brushless motor by determining an energizing timing of a three-phase stator coil based on the rotational position and speed of a rotor. The controller...
8035330 Apparatus and method for driving synchronous motor  
The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the...
8030865 Brushless DC motor and image pickup apparatus  
A brushless DC motor configured to drive a driven member includes a rotor having a magnet, a stator having a coil configured to provide a rotational force to the magnet, a position detector...
8022646 Method and apparatus for spindle motor control  
Information indicative of the placement of spindle motor components may be obtained and used to provide a correction to one or more BEMF-derived attributes used to control the spindle speed. In...
8008878 System for seamless estimation of speed and/or position, including standstill of a permanent magnet rotor of an electric motor  
Procedure for determining the electrical drive speed (ωef) and/or position (φe) in a permanent magnet rotor of a brushless electrical linear or rotary motor from a measurement of a multi-phase...
8004220 Motor drive voltage-boost control  
A drive system for a motor having a rotor and a phase winding (a, b, c) comprises; a drive circuit including switch means associated with the winding a, b, c for varying the current passing...
7982420 Energization timing determination circuit and determination method for energization timing of motor  
An energization timing determination circuit corrects a shift contained in a position signal outputted from a position detecting means and supplies energization timing appropriate to drive a...
7977899 Motor controlling device, motor drive system, method of motor control, semiconductor device and electronic device  
A motor control device is disclosed which is arranged so as to perform a PWM control for a permanent magnet motor including a rotor having a permanent magnet and a stator with a multiphase...
7952309 Rotating electrical machine control device  
A rotating electrical machine control device includes an inverter; a resolver; a unit; a three-phase/two-phase modulation switching unit; and a motor control unit that switches to a two-phase...
7944162 Motor control device  
A motor control device includes a sensing circuit, a phase-shifting circuit, a comparing circuit and a control circuit. The sensing circuit senses the motor to generate a sensing signal. The...
7944159 Rotor orientation detection in brushless DC motors  
In order to determine the orientation of the rotor of a brushless DC motor 100, a sequence of current pulses may be applied to the stator phases U, V, W by the respective drivers HS0, LS0, HS1,...
7911166 Polyphase rotating machine equipped with an improved control device  
A machine comprising a rotor, a stator (12), a control bridge (10) with controlled switches, and a control device (20, 30) supplying control signals (C) to the control bridge (10), wherein the...
7906924 Wide dynamic range motor control system and method  
Methods and systems are provided for controlling a discretely commutated, multi-phase DC electric motor or actuator is used. The methods and systems may be used for motor or actuator applications...
7893638 Apparatus and method for driving rotary machine  
A motor driving apparatus has a loss-of-synchronism monitoring circuit that monitors the rotation of a rotary machine such as a brushless DC motor to detect a sign of transition to a state of loss...
7859209 Control device for synchronous motor  
A control technology for a synchronous motor for suppressing rotational pulsation caused by variation in individuals without making a control algorithm complex is provided. In a motor drive system...
7830106 Controller for motor  
A controller for a motor that can set an induced voltage constant of a motor of a double rotor type according to an operational state of the motor and expand the controllable range of the motor....
7801434 Focus controller and optical apparatus using the same  
A focus controller configured to control focus of an optical element includes a focus state detector configured to detect a focus state based on a contrast value of an image formed by the optical...
7800323 Method and device for estimating the speed of an electric motor  
The invention relates to a device and a method for estimating the rotational speed ω of an electric motor when freewheeling, the method being carried out in a variable speed drive for controlling...
7777436 Sensorless drive for unipolar three phase brushless DC motors  
A system for controlling a trapezoidally (square wave) driven DC motor includes a unipolar commutation circuit coupled between a DC power supply and a brushless DC motor. The motor has three...
7759884 Method and arrangement for commutating an electronically commutated motor  
An electronically commutated motor has a permanent-magnet rotor (124) having: at least two rotor poles (183, 186, 188, 189); at least one phase (126); a power stage (122); and a rotor position...
7750585 Asymmetric control system for a sensorless and brushless electric motor  
A particularly high level of performance in a sensorless, electronically commutated multiphase electric motor can be achieved, wherein for one full cycle at least, one motor phase is controlled in...
7741797 Method for managing transitions in a three-phase BLDC motor and corresponding device  
A method is provided for managing at least one transition in a three-phase BLDC motor describing a cycle including six successive states, wherein the motor obtains first, second and third...
7705550 Noise suppression for hall sensor arrangements  
A method and apparatus is provided for processing signals from a Hall-effect device arrangement coupled to a monolithic brushless DC motor where the motor is driven by a PWM circuit providing PWM...
7679303 Evaluation device and method for rotary drive, corrective manipulated variable setting device and method, control device and method, and program  
An evaluation device for a rotary drive that evaluates periodic velocity fluctuation of the rotary drive is provided. The evaluation device includes a rotational velocity fluctuation detector, a...
7646159 Electrically commutated motor and method for controlling said motor  
An electrically commutated motor comprises a plurality of stator phases and a rotor. Further, sensors for detecting the control deviation of the rotor in relation to the stator phases are...
7633251 Single-sensor based commutation of multi-phase motor  
System, method, and apparatus for commutating and controlling a multi-phase motor using one output rotor sensor and circuitry that measures time between rotor pole-to-pole transitions is...
7626348 Linear motor door actuator  
The present invention relates to an alternating current electrical motor having a first element with magnets of alternating polarities, and a second element with electrical conductor coils, the...
7589483 Motor control  
A washing machine and a method of operating same is disclosed. A electronically commutated motor for using in a washing machine is also disclosed. The washing machine has an agitator operated by...
7580617 Electric fan device and method of driving electric fan device  
An electric fan device includes a motor which drives an electric fan for a vehicle, a control switch which controls a motor current supplied to the motor, and a control unit which controls an...
7567047 Electric motor control strategies for using a low resolution position sensor  
An electric motor control strategy includes using a low resolution position sensor that provides a square wave output signal. The position sensor information is converted into sinusoidal...
7564207 Peak hold circuit, motor drive control circuit having the peak hold circuit and motor apparatus having the motor drive control circuit  
A peak hold circuit is provided that operates stably even if a peak voltage to be held of a motor-drive-current detection voltage is minute. The peak hold circuit includes: a level shift circuit...
7538505 Noise suppresion suppression for hall sensor arrangements  
A method and apparatus is provided for processing signals from a Hall effect device arrangement coupled to a monolithic brushless DC motor where the motor is driven by a PWM circuit providing PWM...
7525268 Control device for an electric motor and related method  
A control device controls an electric motor that includes a winding and generates a back electromotive force. The device comprises a first circuit suitable for setting time periods each centered...
7521885 Activation of an electric motor with continuous adjustment of the commutation angle  
In a method for improving commutation of the at least one phase (Pi) of an electric motor (1), the commutation angle (alpha) of the one or more phases (Pi) is continuously varied in accordance...
7486037 Control method of sensorless brushless direct current motor  
Disclosed herein is a control method of a sensorless brushless direct current (BLDC) motor, and more particularly, a drive control method of a concentrated winding BLDC motor which prevents...
7436139 Phase advance angle optimization for brushless motor control  
A control system for a multiphase permanent magnet motor having a controller for producing a control signal to energize each phase winding. The controller includes a current value calculator for...
7436145 Method and apparatus for controlling brushless DC motors in implantable medical devices  
Methods and apparatus for controlling a polyphase motor in implantable medical device applications are provided. In one embodiment, the polyphase motor is a brushless DC motor. The back emf of a...
7432677 Closed-loop rotational control of a brushless dc motor  
Method and apparatus for controlling a brushless dc motor, such as the type used in a data storage device to rotate data storage media. A sequence of drive pulses is applied to rotate the motor....
7429841 Method and apparatus for movable element position detection in an electrically commutated machine  
A method and circuit for detecting the position of the movable element of an electrically commutated machine. The method and apparatus allow detection of the back electromagnetic force (BEMF)...
7402969 Method for producing voltage waveforms in a PWM motor controller of a PM DC brushless motor  
A method produces PWM voltage waveforms in a PWM motor controller of a three phase PM DC brushless motor, wherein the motor controller has first, second and third half H-bridge transistor pairs to...
7400105 Motor drive device and image-forming device including the same  
A motor drive device having a motor drive unit, a controller, and a rotational detector. The motor drive unit drives a brushless DC motor, the brushless DC motor has a rotor. The controller...

Matches 101 - 150 out of 216 < 1 2 3 4 5 >