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6680599 |
System for limitation of the output current from a speed controller
This invention relates to a system for limitation of the output current from a speed controller for three-phase asynchronous electric motors, comprising a PWM type converter in which the electronic...
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6674258 |
Motor driver and motor drive method
A motor driver having output circuits each including upper and lower side switching elements connected in series. The motor driver includes: a current detection resistance connected in series with...
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6670786 |
Apparatus for controlling an induction motor
If a speed instruction value is less than a predetermined value, the output current of a power-conversion unit is controlled to be larger than a current value in an ordinary no-load operation, or a...
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6667597 |
Method of extending the operating speed range of a rotor flux based MRAS speed observer in a three phase AC induction motor
A method of AC induction motor speed control employing a rotor flux based MRAS (Model Reference Adaptive System) speed observer. Rotor flux-based MRAS speed observers develop two independent rotor...
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6661194 |
Real-time estimation of induction machine parameters using sinusoidal voltage signals
A method and strategy for providing real-time estimates of the machine parameters of an induction machine, including rotor resistance, rotor inductance, stator resistance, stator inductance and...
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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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6642689 |
Control apparatus for power converter
Filter capacitor voltage “Ecf 1 ” is detected and then after d-axis voltage correction value “dvd”, q-axis voltage correction value “dvq”, q-axis current correction value “diq”, and...
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6639378 |
Current chopping in switched reluctance drive systems
A switched reluctance drive is supplied from a power source and has a DC link capacitor. The phases of the machine are controlled by a current chopping controller which, during phase conduction...
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6636012 |
Stator and rotor resistance identifier using high frequency injection
A method and apparatus for generating stator and rotor resistance estimate, the method including the steps of providing high frequency injection voltage signals to a three phase motor, rotating...
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6633149 |
Method for digital control of a universal motor, in particular for electrical household appliances
The invention concerns a method for digital control of a universal motor, in particular for electrical household appliance, comprising steps which consist on: measuring said engine ( 21 ) rotation...
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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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6611124 |
Control apparatus of induction motor
An induction motor control apparatus includes a first constant correction unit for correcting primary resistance based on quantity obtained by multiplying quantity of a voltage command from a...
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6605920 |
Method and apparatus for large motor control
Apparatus and method for providing digital signal processing method for controlling the speed and phase of a motor involves inputting a reference signal having a frequency and relative phase...
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6597144 |
Method and apparatus for power loss detection and saving of operation settings in an appliance
A method and apparatus for monitoring voltage input to an appliance, such as a dryer, sensing when power input to the appliance is lost. In addition, a controller in the appliance pulses relay...
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6590361 |
Method and system for controlling an induction machine
Method and system for controlling an induction machine are provided. The method allows to sense rotor position of the induction machine using a relatively low-resolution rotor position sensor...
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6570778 |
Adjustable speed drive for single-phase induction motors
An adjustable speed drive for single-phase induction motors has a low-cost structure including a rectifier and a two-switch inverter. During full-speed operation, power is supplied directly from...
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6559616 |
Rotational pulse generating circuit for motors
A motor rotational pulse generating circuit for a motor is provided which generates a correct pulse signal even at an initial turning-on stage of the motor, by adjusting a filter cutoff frequency...
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6556941 |
Separation of periodic and non-periodic signal components
A process for obtaining the periodic component in a data vector of data taken of a sensed property of an element driven by one or more rotary components over several rotations. The procedure...
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6552509 |
Method and a device for sensorless estimating the relative angular position between the stator and rotor of a three-phase synchronous motor
A method for sensorless estimation of the relative position between the stator and the rotor of a three-phase synchronous motor during operation. The method comprises the steps of low-pass...
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6552510 |
Method for frequency converter
A method for a frequency converter, when the frequency converter controls a motor and operates torque-controlled partly or entirely in a field weakening region. The method comprises the steps of...
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6525501 |
Method and apparatus for accelerating communication between controllable devices
The present invention is a method and apparatus for data communication between controllable devices, and more particularly, between a first programmable device ( 21 ) and at least one second...
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6515447 |
Fan motor with variable frequency/constant speed control
A fan motor with variable frequency/constant speed control comprises a frequency comparator, a differential integrating circuit, and a differential amplifier. The frequency comparator calculates a...
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6507166 |
CONTROL DEVICE FOR A WIDE SPEED RANGE INDUCTION MACHINE, CARRYING OUT A CONTROL BASED UPON A FLUX ESTIMATION PERFORMED BY MEANS OF A LUENBERGER STATE OBSERVER, AND METHOD FOR POSITIONING THE EIGENVALUES OF SAID STATE OBSERVER
The control device carries out a control of the induction machine based upon a flux estimation performed by means of a Luenberger state observer, the estimation error of which can be defined by...
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6501244 |
Method and apparatus for controlling a high-speed AC permanent magnet synchronous motor coupled to an industrial turbo engine
A method and apparatus for controlling a permanent magnet synchronous motor ( 8 ) coupled to a turbo engine such that transient current and steady state current are minimized. The method comprises...
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6501243 |
Synchronous motor-control apparatus and vehicle using the control apparatus
A digital calculation apparatus 4 including a position-detection means 14 for detecting the magnetic pole position, based on the detected current difference values of the synchronous motor 1 ...
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6476577 |
Motor control circuit
A motor control circuit 10 which controls the speed of a motor 12 by the use of pseudo-randomly generated signals 52.
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6472843 |
System specific fluid flow control with induction motor drive
An apparatus and method for controlling a motor/blower system to provide a constant fluid flow by iteratively loading revised stator frequency values and stator voltage values to a variable...
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6469469 |
Variable output induction motor drive system
A variable output induction motor drive system for use with a polyphase variable output alternating current motor including a rotor and stator to drive an operating load such as an automotive...
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6459230 |
Method and system for measuring a parameter of motor operation
A method of reconnecting a motor to a motor drive comprises controlling a current which flows through the motor using a current regulator. The current regulator produces a voltage command output...
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6456030 |
Synchronous motor control device, electric motor vehicle control device and method of controlling synchronous motor
A synchronous motor control system includes a synchronous motor 1 , an inverter 3 and a controller 4 wherein a current differential detecting unit 13 detects a variation of a motor current...
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6448738 |
Method of controlling an electric motor having a number of phase windings
A motor control strategy for use in combination with an electric motor ( 1 ) having a number of phase windings ( 201, 202, 203 ) is disclosed, the motor ( 1 ) being adapted to produce an output...
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6442979 |
Washing machine motor control device and method
A method and device for driving a clothes washing machine motor at a predetermined speed is presented. The washing machine motor, which may be an AC induction motor, is powered by a DC to AC...
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6437535 |
Starting system and method for a microturbine power generation unit
A power electrical system is disclosed for a microturbine power generator. The invention permits the microturbine to be started using an external DC power source. The DC voltage is converted to a...
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6429612 |
Fast stopping method for induction motors operating from variable frequency drives
A control for an induction motor operated by a variable frequency drive (VFD) includes a control unit adapted to control the VFD in a normal mode or a stopping mode. The normal mode comprises...
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6426605 |
Multi-phase induction motor drive system and method
A multiphase induction motor system is disclosed. The system comprises a motor having at least five phases and comprising a stator and a rotor. For each phase, the motor receives a command current...
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6417644 |
Apparatus and method to generate braking torque in an AC drive
A device and control method to produce braking torque counter to motor rotation. A converter supplies multiple frequency AC power to the motor. A first frequency is supplied at the normal operating...
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6414463 |
Method for measuring the speed of an induction machine
In order to measure the rotation speed of an induction machine whose stator is connected via a controllable AC controller to a single-phase or polyphase AC power supply system, the stator is...
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6411059 |
Device for control of an electric compressor for an air-conditioning circuit
A device for control of an electric motor-driven compressor of an air-conditioning circuit has a control circuit and an inverter for applying a variable frequency to the electric motor for motor...
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6411051 |
Apparatus for monitoring the adhesion of an electric rail vehicle set
This monitoring apparatus for monitoring the adhesion of a motive power unit of an electric rail vehicle set comprises a power control stage for controlling the power supplied to the motor of the...
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6407531 |
Method and system for controlling a synchronous machine over full operating range
System and method for controlling a synchronous machine are provided. The method allows for calculating a stator voltage index. The method further allows for relating the magnitude of the stator...
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6396238 |
Rotational speed control circuit for motor
A rotational speed control circuit for a motor capable of restraining generation of switching noise and vibration during low-speed rotation of the motor. The circuit includes capacitors which are...
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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...
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6388409 |
Electronically commutatable motor
An electronically commutatable motor is described, the stator field windings of which can be connected to a commutation frequency having a DC supply voltage to generate a rotating field for the...
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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 flux...
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6377019 |
Peak torque per ampere method for induction motor vector control
An induction motor control system ( 10 ) for electric vehicles having a DC power supply ( 14 ), an inverter ( 16 ), an induction motor ( 12 ), a motor controller ( 26 ) and a vehicle-level...
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6359410 |
Apparatus and method for motor current protection through a motor controller
The present invention provides a new limiting signal circuit configuration for the connection of a pulse-width modulation motor controller integrated circuit. This new circuit allows for increased...
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6353302 |
Speed computation function for induction motor/blower systems control algorithm
An apparatus and method for controlling an induction motor having a variable frequency drive in a blower system so that the blower system provides a specific fluid flow. A start-up program causes...
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6353303 |
Control algorithm for induction motor/blower system
An apparatus and method for controlling an induction motor having a variable frequency drive in a blower system so that the blower system provides a specific fluid flow. A start-up program causes...
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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...
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6348775 |
Drive wave form synchronization for induction motors
A polyphase induction motor is operated by an inverter drive system comprising a logic level controller. A number, preferably twelve or more, of independently driven phases causes harmonic fields,...
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