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7081734 |
Ride-through method and system for HVACandR chillers
A method of providing ride-through capability in a chiller/refrigeration system employs a variable speed drive with an active converter stage, a DC link stage and an inverter stage for providing...
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7078872 |
System and method for conditioning a signal
A method of conditioning a signal being communicated between a system to be controlled and a controller may include monitoring an actual output signal and conditioning the actual output signal. The...
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7075267 |
Space vector-based current controlled PWM inverter for motor drives
A motor driver has a plurality of output circuits each having an upper side switch and a lower side switch connected in series for supplying a current to a motor. The motor driver includes a...
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7075268 |
System and method for increasing output horsepower and efficiency in a motor
A system and method are provided to increase the horsepower of an induction motor. One technique for increasing the horsepower of a motor is to connect the motor to a variable speed drive that is...
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7075265 |
High phase order electrical rotating machine with distributed windings
A rotating induction machine, containing five or more different phases, having windings distributed according to a sinc function with a cutoff frequency allowing low-order spatial harmonics but...
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7071651 |
Position-of-magnetic-pole detecting device and method
A high-frequency voltage whose amplitude is small is applied as a d-phase command voltage, and an excitation phase is changed to a predetermined degree at predetermined intervals, whereby a motor...
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7064518 |
Driving circuit of an AC fan motor
A driving circuit of an AC fan motor has an AC to DC converter, a regulated voltage divider, a motor driving unit, two windings each having many coils and a harmonic wave suppression unit. The AC...
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7064504 |
Control apparatus for brushless DC motor
A control apparatus for a brushless DC motor that rotatably drives the brushless DC motor including a rotor having a permanent magnet, and a stator having stator windings of a plurality of phases...
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7045986 |
Position sensing method and apparatus for synchronous motor generator system
A position sensing apparatus ( 300 ) derives rotor position of a synchronous machine ( 200 ) from signals output from the machine ( 200 ). In one embodiment, the position sensing apparatus ( 300 )...
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7045988 |
Sensorless controller of AC motor and control method
A speed control apparatus having a high frequency generator for superposing a high frequency signal on an estimated magnetic flux axis. A high frequency component extractor extracts an error signal...
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7042193 |
Control apparatus for rotating machine
In a control apparatus for a rotating machine, an integration unit integrates a primary angular frequency based on an angular velocity command and computes phase, a power converting unit applies...
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7034478 |
Digital spindle control architecture
A three-phase spindle motor has three terminals each driven with pulse width modulated signals. Rotation of the motor is controlled by iteratively measuring an electrical period of the motor,...
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7034500 |
Electric drive assembly
An electric drive includes a rotatable shaft, a first drive member, and a second drive member, and is supplied with power from a controller. The controller is operable to supply a first power from...
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7030588 |
Control constant adjusting apparatus
A control constant adjusting apparatus in a control apparatus of a robot or a machine tool, etc. is disclosed. This control constant adjusting apparatus includes a speed control part ( 12 ), an...
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7026785 |
Motor controller
A system and method for controlling an electric motor is disclosed. The method comprises determining the operating load of the electric motor and then calculating the voltage to be applied to the...
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7026771 |
Motor control apparatus and electric appliance using the same
A microprocessor of the motor control apparatus acquires a zero-cross detection signal from a zero-cross detection section and a load current from a current detection section at a prescribed...
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7026786 |
Reduced part count feedforward motor control
A system for controlling a motor comprising: a voltage source; a motor in operable communication with an inverter, the motor responsive to a command signal from the inverter, the inverter is in...
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7023172 |
Motor controller
An electric motor control apparatus of this invention estimates changes in temperature of a semiconductor device to compute temperature change amplitude 108 based on an output current signal 105...
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7015673 |
Method and apparatus for reducing generated heat in three-phase motors driving air circulation fans in large industrial refrigerators and freezers
A method and apparatus is disclosed for reducing the heat generated by three-phase motors operating under load in cooled chambers such as industrial walk-in refrigerators and freezers. Specific...
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7009361 |
Process for measuring the speed of an induction motor from null applied frequency status
Sensorless control of an induction motor, such as for electric vehicles, in which the speed of an induction motor is determined without encoders or other shaft transducers. When the applied...
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7005825 |
Motor controller
In an electric motor control system according to the present invention, in restarting, after the effect of transient variation has been abated, a phase-reversal-timing detecting means 31 detects...
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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...
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6969968 |
Control device and controlling method of inverter
A carrier wave frequency generating unit 9 modulates a frequency f of a carrier wave in a triangular shape. Occurrence of drawbacks due to the frequency f of the carrier wave can thereby be...
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6969969 |
Circuit arrangement for the actuation of an electric-motor drive, in particular a pump drive, in a large domestic appliance
A large domestic appliance has main and auxiliary drives ( 17, 24 ) thereof supplied from the same dc voltage intermediate circuit ( 19 ) which is provided only once, by way of change-over switch...
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6967453 |
Method and apparatus for controlling fan motor
A method and an apparatus for controlling a fan motor which is arranged to arranged to cool an object to be cooled and to be controlled by an inverter whose output is connected to the fan motor....
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6946815 |
Switch for a variable-speed induction motor
A switch for a variable-speed induction motor includes conductive connecting pieces, a rotary member, and a driving unit. The connecting pieces are mounted in a housing, are adapted to be connected...
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6940253 |
Method in connection with sensorless induction motors
A method for the stabilization of full-order flux observers for speed-sensorless induction motors in the regenerative mode. The method comprises determining the current vector of the induction...
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6930459 |
Method for reducing the influence of a DC current component in the load current of an asynchronous motor
A method with which the load current and thus the load moment of an asynchronous motor that is controlled via a phase-controlled two-phase thyristor power controller, can be easily influenced so as...
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6914398 |
Rotary machine control
The present invention discloses devices and methods for improved starting and stopping of rotary motors. A rotary electrical machine ( 3 ) is supplied with a voltage from a voltage supply ( 10 )....
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6909258 |
Circuit device for driving an AC electric load
A circuit device is provided for driving an AC electric load, of the type inserted between a terminal of an AC power supply line and a terminal of the electric load to be driven and including a...
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6900614 |
Rotation speed search apparatus for increasing an output voltage of an inverter and method thereof
A rotation speed search apparatus for an induction motor includes: a voltage control unit for comparing a rated current of a motor and a current detected from the motor and generating an output...
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6879130 |
Controller for induction motor
A controller for a vector control of an induction motor, which is capable of easily determining a rotor resistance for use in calculation of a slip frequency. A temperature sensor is provided for...
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6864662 |
Electric power assist steering system and method of operation
An electric power steering assist system for an automotive vehicle comprises a brushless electric motor and a control module for regulating the motor based upon space vector modulation. In response...
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6841969 |
Flux observer in a sensorless controller for permanent magnet motors
A control system includes a field oriented controller that receives a torque command and that generates phase voltages for an electric machine. A first transformation module receives stator...
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6831431 |
Method for regulating the rotational speed of a motor and a motor for carrying out a method of this type
The invention concerns a method for regulating the rotation speed, of a motor with which a digital rotation speed controller is associated and which, during operation, furnishes an actual-value...
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6828752 |
Driving equipment and semiconductor equipment for alternating-current motor
The present invention enables modulated wave signals having extremely small waveform distortion to be generated using a relatively simple circuit, and thereby it is possible to hold down vibrations...
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6828744 |
Motor torque control apparatus and method
A motor torque control apparatus and method are disclosed. By adding the value of the compensation voltage which is obtained by proportionally integrating a difference value between the...
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6822418 |
Position estimation and demagnetization detection of a permanent magnet motor
A feedback response signal in a motor drive system in response to injection of a high frequency carrier signal provides information for determining motor position and demagnetization detection. The...
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6788024 |
Position-sensorless motor control method and apparatus
A provide a position-sensorless motor control apparatus comprises a salient-pole AC motor 2 , a PWM inverter 3 for applying voltage to the AC motor 2 , and a controller 1 for controlling the...
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6763622 |
Amplitude detection method and apparatus for high frequency impedance tracking sensorless algorithm
A control system for an electric motor including an inverter for providing power to the electric motor, a controller for controlling the inverter, a first motor speed control block in the...
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6753670 |
Universal energy regulating controller circuit
A power controller for applying power to an induction motor or similar AC load has a variable drive circuit for staring and switching a portion of the AC input line power. In one mode, the input...
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6735284 |
System for controlling motor and method for the same
The present invention relates to a system and a method for controlling a motor. A rotation/fixed coordinates converter converts a reference magnetic flux voltage and a reference torque voltage of a...
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6731095 |
Controller for multiplex winding motor
A controller for a multiplex winding motor. When a multiplex winding motor is driven and controlled by inverters and each winding includes a current control system, the controller compensates...
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6720748 |
Static commissioning method and apparatus to identify rated flux current
A method for use with an adjustable frequency controller to deliver current to an electromagnetic load including a stator and a rotor, the method for identifying a flux current estimate and...
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6717384 |
Frequency changer protection circuit for controlling the acceleration of an electric vehicle
A frequency regulator protection circuit for controlling acceleration of electric vehicle comprises a power unit, a display unit, a protection unit, a control unit, a sensor unit, a data processor...
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6713986 |
Controller for air conditioners and heat pumps
A speed controller for a single phase motor such as a permanent split capacitor motor allows the motor to be operated at a first speed, n 1 , and a lower speed, n 2 . High speed motor operation is...
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6700347 |
Speed varying device
This invention is to provide a variable speed apparatus capable of equalizing a moving distance at the time of deceleration from deceleration start to deceleration completion in the case that a...
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6696814 |
Microprocessor for controlling the speed and frequency of a motor shaft in a power tool
A control system for driving a power tool is provided comprising a power source, a motor adapted to drive a shaft, a power switching unit interconnecting the power source and the motor, and a...
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6693406 |
Method of controlling a motor and a power supply apparatus
The present invention relates to a method and an apparatus for controlling an electric motor by regulating at least the current I out , the voltage U out and the frequency f out to an input of...
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6690139 |
Method and apparatus to limit motor current at low frequencies
A method and apparatus for use with an induction machine system including a controller and d and q-axis current feedback loops, the controller receiving a frequency command signal and generating d...
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