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7609016 Systems and methods for driving a motor  
A control system includes a controller configured to provide a drive signal, and a switching device configured to generate an output control signal as a function of the drive signal in an on-state...
7589489 Method and arrangement for controlling the electricity supply of an electronically commutated motor  
A control circuit ( 150 ) for controlling the current supplied to a winding strand ( 102 ) in an electric motor ( 143 ). The control circuit comprises at least one semiconductor switch ( 106 ) and...
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...
7439696 Rotating electric machine and manufacturing method thereof  
A control device of a rotating electric machine to which an inverter is integrally assembled is downsized, and manufacturing costs are reduced. An inverter for controlling outputs from the rotating...
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...
7327545 Electric generation control device of electric generator for vehicle  
An electric generation control device detects the occurrence of a failure such as a short circuit failure and an open failure in one of a pair of power transistors, which form a H bridge circuit...
7202626 Variable speed drive for a chiller system with a switched reluctance motor  
A variable speed drive with a boost converter is provided for a chiller system driven by a switched reluctance motor. The boost converter can be a diode or thyristor rectifier followed by a boost...
7193378 Wye switch inverter for electric and hybrid vehicles  
A circuit for controlling a multi-phase machine having a stator with stator windings includes a controller, primary commutation switch pairs, a neutral terminal, and commutation control switches....
7154237 Unified power control method of double-ended inverter drive systems for hybrid vehicles  
A method of providing a unified power control of a motor including providing a first inverter system, a second inverter system, and a motor coupled therebetween; coupling the first inverter system...
7138773 Multiple inverters for motors  
A non-highway vehicle including an engine, a DC power source driven by the engine and providing DC power via a DC bus, a traction motor, a circuit for connection to the DC bus for providing power...
7126301 Motor driver  
A motor driver drives a motor composed of a rotor and plural-phase windings that generate a magnetic field for rotating the rotor, including: a plurality of transistors that operate as switches for...
7057371 Inverter for electric and hybrid powered vehicles and associated system and method  
A hybrid/electric vehicle including a battery system connected to a DC charger, an inverter coupled to the battery system, and an electric AC motor coupled to the inverter. The motor has first,...
7053569 Inverter control method and its device  
An inverter controlling method is applied in a system comprising a single-phase rectification circuitry and three-phase inverter. The method determines a capacitance of a capacitor connected...
7049770 Current control circuit and motor drive circuit that can accurately and easily control a drive current  
A current control circuit includes a control current generation circuit that generates a control current in accordance with an external current control signal. A plurality of drive current...
7005813 Booster circuit for a pre-drive circuit of a brushless direct current single-phase motor  
A booster circuit for a pre-drive circuit of a brushless direct current single-phase motor. When a series pair of power FETs of the drive circuit turn on, one boost control switching element of the...
6998801 Motor drive device and motor drive integrated circuit device  
A motor drive device which controls a spindle output predriver unit and power MOSFETs of an output stage associated with it to form a PWM signal in such a manner that a detection current formed by...
6969963 PWM controlled motor drive  
The motor driver having a plurality of output circuits each having two switching elements connected in series includes: a phase switch circuit for putting a switching element on one side of one...
6906481 Power sharing high frequency motor drive modular system  
Methods and apparatus are provided for frequency and power scaling a drive assembly for a brushless direct current (BLDC) motor. The apparatus comprises multiple groups of half-bridge switching...
6639372 Motor and disk drive apparatus  
A motor comprising: Q-phase windings; voltage supplying unit; power supplying unit having Q first power transistors and Q second power transistors for supplying a power to said Q-phase windings;...
6362583 Control unit for a brushless motor and read/write device including such a control unit  
A control unit ( 1 ) according to the invention for controlling a brushless motor ( 5 ) includes position detection means ( 10 ) for generating a signal (S 1 ) which is indicative of the position...
6091216 Motor-driving circuit  
When a brushless motor is rotated at low speeds (the answer of a step S12 is YES), the brushless motor is driven by exciting a first phase coil, a second phase coil and a third phase coil by a sine...
6043618 Motor driving apparatus having back-gate-floating MOSFET for avoiding reverse current  
In an apparatus for driving a motor including first and second terminals, a back-gate-floating MOSFET has a drain connected to the first terminal. A bridge circuit is connected between the source...
6023137 Use of traction inverter for supplying power for non-traction applications  
A method and apparatus for cranking of an internal combustion engine in an AC electric traction motor propelled vehicle using inverters normally coupled to supply power to each of a plurality of AC...
6002226 Brushless DC motor control method and apparatus for reduced commutation noise  
A brushless DC motor modifies motor commutation events to reduce noise by providing overlapping activation of the switch being deactivated with the switch being newly activated so that three...
5977739 Stepping motor provided with a drive control integrated circuit having a prestored operating pattern  
A drive control integrated circuit for controlling a motor, such as a stepping motor, a servo motor, or the like, which is operated by pulse signals, comprising: a memory circuit which stores...
5977734 Circuit and method for determining optimal phase combination for startup of a polyphase DC motor  
A circuit for determining an initial winding combination for motor startup of a polyphase dc motor having a transistor driver circuit comprising a plurality of high side winding drivers and low...
5955851 Brushless dc motor PWM scheme for quiet commutation  
The present invention is a brushless dc motor driver system for quiet commutation of current from one load winding to another load winding. The system comprises a first circuit, a second circuit...
5945801 Drive circuit for switched reluctance motor  
In a drive circuit for a switched reluctance motor, a DC power supply is provided, a plurality of main circuit switching devices cause branched currents from a current derived from the DC power...
5942866 PWM control circuit for a DC brushless fan  
PWM control circuit for a DC brushless fan, including a rectifying circuit which rectifies a voltage signal representative of the rotating speed of the fan, a comparator which compares the...
5940576 Electronic control unit for a vacuum pump  
The invention is concerned with an electronic control unit (1) for the electric motor of a vacuum pump (100) comprising a suction port (119), an exhaust port (120) and pumping stages formed by...
5939807 Cap mounted drive for a brushless DC motor  
A brushless DC motor and drive package is disclosed, including modular subassemblies which are integrated into a single unit. The drive includes power electronic circuitry and related control...
5939854 Circuit for driving a switched reluctance motor  
A switch reluctance motor drive circuit includes first drive circuits (50) for driving a plurality of high switching elements (23, 24, 25), in response to an input signal (H in ) for driving a gate...
5936370 Electromagnectic rotating machine  
An electromagnetic rotating machine driven by an electromagnetic action between a stator and a rotor has drive windings fitted to the stator for generating a rotating magnetic field for rotatably...
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...
5936374 Repulsion motor  
A brushless repulsion motor in which the rotor carries electronic switch circuits for selectively shorting the rotor windings at appropriate times in its rotational cycle. A non-contact reference...
5936364 Drive control apparatus for brushless motor  
A pulse width of a drive pulse of a brushless motor is modulated in correspondence to a setting signal for setting the rotation rate. Switching control for the current supplied to exciting coils is...
5936378 Motor controller  
A motor controller comprising drive unit for supplying power to the stator windings of a motor based on a current command, a stator current detection unit for detecting the stator current flowing...
5932987 Variable step rate precision pumping apparatus  
A method and apparatus for controlling a low volume, low rate precision dispensing pump for photochemicals and the like comprises generating constant current signals having magnitudes related by...
5929590 Method and apparatus for implementing sensorless control of a switched reluctance machine  
A doubly-fed switched reluctance machine in which at least two sets of phase winding are energized to produce desired output torque is disclosed. Also disclosed are dual and single power converters...
5929591 Air conditioner  
For achieving an air conditioner being applicable to various a-c source voltages in common and operative with high power factor by suppressing generation of high harmonics, an a-c source voltage...
5886487 DC motor driver having output FETS that conduct to rectify output overvoltage and undervoltage transients  
A motor-winding driver circuit includes a high-side double-diffused metal-oxide-semiconductor (DMOS) field-effect transistor (FET) connected between a direct-current (DC) power supply node and a...
5866998 Circuit for improving back emf detection in pulse width modulation mode  
A power-switched driver circuit for a disc drive that provides accurate back emf detection in PWM mode. In one embodiment, a power transistor is coupled between the low side drivers and ground....
5867001 Trim circuitry and method for accuracy in current sensing  
A motor driver circuit (12) for providing drive signals to stator coils of a polyphase dc motor (10) includes a plurality of current paths, each connected between a supply voltage and a reference...
5859511 Motor with input-controlled high side driver  
A circuit for operating a polyphase DC motor, such as the type having a plurality of "Y" connected stator coils, has circuitry for charging the coils at a rate which will reduce EMI and other...
5825146 Motor drive device  
A motor drive device including a substrate, a control unit packaged over the substrate for generating a pulse width modulation signal; insulation means packaged over the substrate, a gate drive...
5793170 Motor drive circuit  
In a motor drive circuit, the collector-emitter paths of two npn-type transistors are connected in series between a power line and ground, and the junction between the two transistors is connected...
5717298 Brushless DC motor start circuit that suppresses field excitation during alternate polyphase commutation states when starting  
During start-up a telegraph-start circuit for a DC motor withholds exciting current from the stator field coils during alternative ones of the polyphase commutation signals used when the motor is...
5705902 Halbach array DC motor/generator  
A new configuration of DC motor/generator is based on a Halbach array of permanent magnets. This motor does not use ferrous materials so that the only losses are winding losses and losses due to...
5625265 Compact, high efficiency electronic motor controller with isolated gate drive for power transistors  
A motor controller operable at a PWM (pulse width modulated) repetition rate above 6,000 Hz. A special saturable transformer with an interwinding capacitance of less than 5 picofarads is used to...
5619113 Reluctance-type motor  
An object of the present invention is to obtain a reluctance-type motor which generates small vibration, rotates at a high speed, generates a large output torque, and provides a flattened torque...
Matches 1 - 50 out of 92 1 2 >