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6388419 Motor control system  
A motor control system 16 for use within an electric vehicle 10 having an induction motor 12. Control system 16 utilizes a torque control module 18, a vector control module 20 and a space vector...
6384568 Induction motor driver  
According to an aspect of the present invention, an induction motor driver includes a DC power supply having a selectively variable voltage. The driver also includes an inverter coupled to the DC...
6384567 Controller and control method for motor/generator  
A motor/generator (20) is provided with plural groups of coils (6), and inverters (30) supplying a polyphase AC current converted from a DC current to each group of coils (6) in response to pulse...
6377018 Speed sensorless vector control apparatus  
A control apparatus for estimating the flux, the current, and the speed of an AC motor using the current and the voltage, and controlling the vector of an AC motor using the estimated speed, a...
6377015 Voice coil motor control apparatus for use in disk drives  
Disclosed herein is a system for applying a power-supply voltage to the voice coil control circuit provided in a disk drive and designed to drive the head actuator provided in the disk drive. The...
6377017 Control device for alternating current motor  
A control device for an alternating current motor includes: a target current generating unit which generates a current order value, based on a torque order, as a d-axis target current and a q-axis...
6373219 Motor control system and motor control method  
An object of the present invention is to provide a motor control system comprising an R/D converter which is capable of outputting a good phase signal without being affected by the switching noise...
6369543 Method for symmetrizing asymmetric faults  
The present invention concerns a method for symmetrizing asymmetric faults occurring within a pull chain comprising a synchronous or asynchronous motor controlled by a two-level or multi-level...
6369535 Method and apparatus for current shaping in electronically commutated motors  
A method and apparatus are disclosed for shaping current in an electronically commutated motor (ECM), the method comprising: acquiring a set of terminal voltage measurements; estimating an...
6366049 Motor starter and speed controller system  
A speed controller circuit for a motor including a ramp function generator having a first input connected to a source of a speed demand signal and a second input connected to a ramp step signal....
6362593 Apparatus and method for compensating dead time of motor  
Disclosed is a method of compensating a dead time of a motor driving device comprising a current command generating unit generating a current command according to a predetermined algorithm, and a...
6359406 Three-phase direction-current (DC) brushless motor with hall elements  
Disclosed is an improved three-phase direct-current (DC) brushless motor with Hall elements, in which two Hall elements instead of three Hall elements are placed upon the driving circuit of the DC...
6359413 Current control system for a switched reluctance motor  
A current control system for a switched reluctance motor that eliminates the effects of back EMF produced by such motor on the current control loop. The control system includes a current regulator...
6356043 Motor controller power switch arrangement  
A polyphase inverter employs multiple power semiconductor switches both for its operation and to distribute the current and heat loads for improved operation and cooling. The inherently high...
6356048 Method and device for controlling electric motors of the brushless direct-current type, particularly for moving the weft winding arm in weft feeders for weaving looms  
The method consists in determining the angular positions of the rotor, which are useful for switching the phase currents, by deducing them from the sampled reading of the phase voltages, and in...
6351095 Polyphase induction electrical rotating machine  
An electrical rotating machine comprises an inverter drive system wherein alternating current comprising more than three phases is produced from the inverter drive system. The machine further...
6335606 Control device and method for motor/generator  
A motor/generator has a stator provided with a plurality of coils (6), a first rotor (3) provided with a fixed number of magnetic poles, and a second rotor (4) provided with fewer magnetic poles...
6333617 Inductive load drive control for selectively extinguishing energy through switching devices or diodes  
In a motor drive control, four MOSFETs are connected in an H-bridge configuration, and four diodes are connected in parallel with the MOSFETs, respectively. A pair of MOSFETs at the high side are...
6316905 Means and device for determining the angular velocity of a rotor of polyphase machine operated by field orientation without a transmitter  
A method and a device are described for determining an angular velocity of the rotor of a polyphase machine operated by field orientation without a transmitter, wherein control signals, a stator...
6313602 Modified space vector pulse width modulation technique to reduce DC bus ripple effect in voltage source inverters  
A modified PWM space vector technique is described which includes a DC ripple voltage measurement scheme supplying feed-back to a DSP controller which then computes and generates the instantaneous...
6313603 Method of regulating a rotary machine, and power supply circuit for such a machine  
A method of regulating a rotary machine powered by a voltage inverter receiving, as input a control voltage delivered by a regulator servo-controlling the electromagnetic torque on a reference...
6313598 Power semiconductor module and motor drive system  
A power semiconductor module comprising a power semiconductor element included in a power circuit portion and mounted on a metal base, a first resin molded to the power semiconductor element, a...
6313593 Motor controller  
Provided to the motor controller is means which can alter a conversion ratio with which a current value detected by a current detector is converted into a unit (such as voltage) easily usable in...
6313600 Control method and apparatus for insufficient input voltage in an AC drive  
An electric drive apparatus and method for controlling AC motors wherein the motor output is a function of the AC input power to the electric drive. Means are provided for detecting the voltage...
6313599 Method for controlling an inverter  
A method for controlling an inverter which comprises the switching components to be controlled, the method comprising the steps of determining a current vector (iolo) for the inverter output;...
6300741 Speed controlling method for induction motor  
A system for controlling the speed of an induction motor by controlling an output voltage and an output frequency of a power inverter in accordance with a speed command includes a computing unit...
6301137 Three-phase current sensor and estimator  
In a three-phase DC-to-AC inverter including, for driving each leg of the load, a controlled power driver such a pulse-width modulated field-effect transistor (FET) or insulated gate bipolar...
6297574 Magnetic bearing apparatus  
A magnetic bearing apparatus for the journalling of a body (3), in particular of a rotor (3), comprises a stator (2) with a control winding (22) having at least three loops (22a, 22b, 22c) for the...
6291963 Drive circuit for motor/generator  
A polyphase alternating current is supplied from an inverter (22) to a plurality of coils (L1-L12) of a motor/generator (10, 11). A plurality of PWM signal generating circuits (26) respectively...
6291954 Method and circuit arrangement for monitoring the operating state of a load  
A invention relates to a method for monitoring the operating state of a load which is driven cyclically by a control signal, especially for an electric motor in a motor vehicle, the cyclic drive...
6288510 Drive controller for motor-driven high-speed rotating body and method for discriminating type of machine used therefor  
An objective of this invention is to provide a drive control device to control the drive applied to a high-speed rotor unit which would have no circuits in either its pump unit A or its power...
6278256 Electric vehicle control system for controlling a permanent magnet motor which drives the electric vehicle  
An electric vehicle control system for controlling an electric vehicle. The electric vehicle control system includes an inverter adapted to receive DC power from an overhead power line for...
6275000 Method of controlling an induction motor and apparatus for carrying out the same  
A method and an apparatus for controlling an induction motor which allow torque generated by an induction motor upon starting operation to be increased without need for employment of expensive...
6259226 Controller for AC motor  
There is provided a controlling device for an AC motor having a structure in which a current of a three phase brushless DC motor is detected and then converted to a rotor coordinate system, to...
6252367 Servo controller  
A servo controller capable of controlling motors to be driven in different control modes, such as a synchronous motor and an induction motor, irrespectively of the type of the motor, and also...
6246208 Method of feeding asynchronous motors with an inverter, in particular for battery-powered vehicles  
The present invention relates to a method of feeding asynchronous motors with an inverter, of the type comprising a driver of the inverter and feedback of the voltages at the terminals of the...
6246207 Method and apparatus for controlling an induction motor  
A method and apparatus for controlling a motor. The apparatus includes a voltage input; a half-bridge inverter connected the voltage input and to the motor to provide low speed excitation to the...
6242884 Dual stator winding induction machine drive  
A dual stator winding induction machine has two windings with input terminals which are supplied separately with drive power. The two stator windings have a different number of poles to...
6239575 Induction motor power/torque clamping for electric vehicle performance  
An induction motor control system (10) for electric vehicles having a DC power supply (12), an inverter (14), an induction motor (16), and a clamping unit (26). The clamping unit (26) applies a...
6236583 Inverter and motor  
A motor (4) comprises a stator which generates a rotating magnetic field according to the energization of plural groups (A, B) of coils, and a rotor rotated by the rotating magnetic field of the...
6232731 Multi-channel motor winding configuration and pulse width modulated controller  
A multi-channel motor winding configuration providing low harmonic distortion and a PWM inverting controller for this type of winding configuration are disclosed. The motor winding configuration...
6232730 Brushless motor driving circuit and a method of controlling the brushless motor driving circuit  
In a brushless motor driving circuit of the invention, in the starting operation, an applying voltage is low and also the induced voltage is low, so that output values from sample and hold...
6232742 Dc/ac inverter apparatus for three-phase and single-phase motors  
Electrical power apparatus is disclosed for selectively powering either a three-phase ac motor or a single-phase ac motor. A dc/ac inverter is configured to provide appropriately phased input...
6229278 Voltage and current limiting method and apparatus for a voltage/frequency drive  
A method and apparatus for maintaining both a DC bus voltage and a motor current within limit values wherein, when a voltage limit condition occurs, a voltage error (i.e. DC bus voltage limit...
6222335 Method of controlling a voltage-fed induction machine  
A control algorithm or method for use in controlling a voltage-fed induction machine. The control algorithm includes the following steps. The DC link voltage supplied to an inverter driving the...
6211635 Brushless motor driving system for driving outdoor fan of air conditioner  
This invention relates to a brushless motor driving system for driving an outdoor fan of an air conditioner. The driving system comprises a Hall probe for detecting a position of a rotor of a...
6208098 Variable frequency drive noise attenuation circuit  
A noise attenuation circuit is disclosed for use in a motor drive system. The motor drive system includes a pulse width modulated inverter providing three phase power output on three phase...
6198248 Method of controlling a rotary electrical machine, a servo-control system for implementing the method, and a rotary machine fitted with such a system  
A method of controlling the torque of a rotary machine powered by means of an inverter and servo-controlled by a system having sensors, an observer, and a computer which delivers controls to the...
6184647 Method of estimating initial pole position of permanent magnet brushless motor  
In order to estimate a magnetic pole position of a permanent magnet type brushless motor, the following steps are conducted. A given γ axis and a given δ axis in an advanced from the γ axis by an...
6184648 Motor control apparatus  
According to this invention, there is provided a motor control apparatus comprising a field weakening device for converting a velocity feedback signal obtained from the rotational speed of a motor...