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7622886 |
Method for determination of the risk to disturbance-free operation of a frequency converter
The invention relates to a method for determining the chance of a disturbance-free operation of a frequency converter ( 2 ) connected to a feeding network ( 18 ). According to the invention, during...
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7612517 |
Stepping motor controller and gaming machine
A stepping motor controller includes: a pulse frequency adjustment circuit that receives a command pulse having a first frequency from an external controller that outputs the command pulse in...
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7595604 |
Motor control device
Let the rotating axis whose direction coincides with the direction of the current vector that achieves maximum torque control be called the qm-axis, and the rotating axis perpendicular to the...
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7588124 |
Speed control method of elevator-purpose inverter and speed control apparatus thereof
A speed control method of an elevator-purpose comprising previously calculating an elevating distance in such a case that the elevator passenger car is decelerated from a reference frequency up to...
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7586286 |
Method and apparatus for motor control
A system and method for controlling a permanent magnet motor are disclosed. Briefly described, one embodiment receives a torque command and a flux command; receives information corresponding to a...
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7583049 |
Sensorless control systems and methods for permanent magnet rotating machines
Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a...
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7583048 |
Controller for motor
A controller for a motor carries out field weakening control by using a simple construction to change the phase difference between two rotors, which are disposed around a rotating shaft, without...
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7576511 |
Motor control device and motor control method
The present invention employed a motor control device including: current sensors which detect currents in each phase of a three-phase motor; a coordinate conversion device which computes a d-axis...
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7576510 |
Control method for a synchronous motor, particularly for circulation pumps
The present invention relates to a control method for a synchronous electric motor with permanent-magnet rotor, particularly for fluid circulation pumps in conditioning systems and/or household...
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7576509 |
Drive control method, drive control device, belt apparatus, image forming apparatus, image reading apparatus, computer product
Driving of a pulse motor is controlled in such a manner that a rotating body driven by the pulse motor rotates at a uniform angular velocity. Angular displacement of the rotating body is detected,...
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7573227 |
Controller and control method of permanent magnet type rotary motor
A controller of a permanent magnet type rotary motor of the present invention includes: a current difference calculator decomposing a primary voltage difference which is a difference between a...
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7567055 |
Controller for brushless motor
A controller for a brushless motor determines difference between target currents and detected currents in a dq coordinate system and determines a target voltage applied to an armature winding based...
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7567054 |
Control circuit and method of controlling rotation frequency of spindle in optical disc drive for reducing frequency difference of output signals respectively corresponding to different disc rotation modes
A control circuit and a control method of controlling a rotation frequency of a spindle in an optical disc drive, the control circuit comprising: a spindle controller, electrically coupled to the...
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7560896 |
Vector control apparatus for permanent magnet motor
A vector control apparatus for a permanent magnet motor operated in the region of weak magnet field, wherein when the output voltages of the power converter saturate, the phase error command value...
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7560894 |
Method and system in connection with permanent magnet synchronous machines
A method and a system in connection with a speed and position sensorless permanent magnet synchronous machine equipped with an output filter and driven by an inverter, which method comprises the...
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7548039 |
Motor control unit
A motor control unit including a rotational position detector detecting a rotational position of a brushless DC motor; a current detector detecting a current of the brushless DC motor; a coordinate...
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7545116 |
Driver for induction motor and method of driving the same
An object of the present invention is to provide a driver for an induction motor which performs an operation at an acceleration suitable for the magnitude of a load and is excellent in efficiency,...
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7545115 |
Motor control and driver for electric boosting application
The invention proposes a system for driving a compressor, comprising an induction motor ( 2 ) for driving the compressor ( 3 ), said induction motor including a squirrel cage rotor, and a...
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7531982 |
Motor drive apparatus capable of accurately estimating demagnetization of permanent magnet motor
A map holding unit holds, in the form of a map, a voltage control amount of the q axis in a case where no demagnetization of a permanent magnet motor occurs. Based on a motor revolution number,...
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7528569 |
Inverter circuit free from power-source-voltage fluctuation
An inverter circuit includes a bridge circuit constituted of a plurality of pairs of a high-side switching element and a low-side switching element, a command signal processing section, a pulse...
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7511450 |
Frequency converter, motor, motor drive system and maintenance method for motor drive system
A frequency converter for outputting a power to drive a motor, having: an inverter unit for inverting a d.c. power to an a.c. power; a control unit for controlling the inverter unit; and a housing...
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7511449 |
Electric motor system implementing vector and slip control
A system is provided for controlling an electric machine. The system has a power source configured to supply electric energy to the electric machine. In addition, the system has an inverter...
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7511448 |
Motor control device
In a motor control device according to the invention, upon velocity control of a motor, a superimposed signal generating unit 9 outputs a superimposed signal idh of a repetitive waveform, such as...
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7511447 |
Motor drive apparatus
When a torque command value from an external ECU is within a predetermined variation width, a control unit generates a signal and outputs the signal to a voltage command calculation unit so that...
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7508160 |
Soft start system for motors utilizing variable frequency drive and autotransformer
A soft start system for starting large motors has a power supply suitable for passing power to the motor, a variable frequency drive connected to the power supply and an autotransformer connected...
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7508156 |
Electrical machine having a series chopper circuit
A controller and a motor assembly having a controller. The controller includes a first switch assembly in a series configuration with the motor, where the first switch assembly has a first...
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7504797 |
Motor control device
A motor control device includes an estimator for estimating a rotor position of a motor having a salient pole by using a value corresponding to a q-axis inductance of the motor as an operation...
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7502238 |
Rectifier for reducing current harmonics from unbalanced source
A rectifier includes a transformer, a rectifying bridge, a link capacitor, and at least a first resonance loop. The transformer is operable to receive three phase input signals having a source...
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7468595 |
System and method of controlling the start-up of an adjustable speed motor drive based sinusoidal output power conditioner
A motor drive for conditioning power to be delivered to a load includes a current feedback circuit that monitors current being fed to a transformer connected between the motor drive and the load....
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7466088 |
Signal control for motor position determination
A controller estimates a motor position. The controller includes a driver and an injector. The driver generates a fundamental control signal. The injector generates a position carrier voltage that...
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7463006 |
Motor and drive control device therefor
The invention provides a drive control device for the motor as well as an electric power steering apparatus using the motor and the drive control device. Respective phase current command values are...
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7459874 |
System and method for controlling electric drive systems
Methods, apparatus, and systems are provided for regulating the operation of a drive system within a battery voltage and power range. The apparatus includes a PI regulator producing a signal for...
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7456603 |
Phase detection circuit, resolver/digital converter using the circuit, and control system using the converter
A small-sized and low-cost phase detection circuit which has improved noise immunity. The phase detection circuit comprises a multiplier for multiplying an input signal by a reference signal and...
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7453231 |
Electric vehicle control device
An object of the present invention is to provide an electric vehicle control device which is capable of detecting even a state in which only one phase of one induction motor is disconnected in a...
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7449859 |
Reduction of subharmonic oscillation at high frequency operation of a power inverter
A control architecture for an electrical inverter includes a synchronous frame current regulator and a stationary frame current regulator. The stationary frame current regulator receives input...
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7443132 |
Motor control device and method
A motor control device for controlling rotation of a motor by controlling a driving voltage applied to the motor is provided. The device includes a driving voltage control unit configured to...
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7443131 |
Control device for electric power steering apparatus
A control device for electric power steering apparatus, in which when torque ripples at the time of the rotation of a motor is reduced by simple arithmetic, smooth and safe assist limitation is...
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7443127 |
Apparatus and method for motor control using table
In an apparatus of controlling a motor in a battery vehicle, a current command generation section has a table, and generates an exciting command current and a torque command current by referring to...
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7423401 |
AC rotary machine constant measuring apparatus for measuring constants of stationary AC rotary machine
In an apparatus measuring constants of an induction motor, an inverter converts an inputted voltage command signal into a single-phase AC power and feeds the single-phase AC power to the induction...
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7405534 |
Apparatus and method for controlling velocity of motor
An apparatus controlling a velocity of a motor having a rotor, includes a sensing velocity calculator sensing a rotation velocity of the motor, and calculating a sensing velocity on the basis of...
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7403700 |
Motor control device
A motor control device is used to control a motor to rotate. The motor control device includes a phase-wave signal sampling module, a first waveform modulating module, a second waveform modulating...
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7403404 |
Power inverter system and method of correcting supply voltage of the same
In a power inverter system, an inverter unit includes first to third single-phase inverters. In the power inverter system, a reference-frequency calculating unit calculates a reference frequency of...
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7400109 |
Inverter circuit and compressor
An inverter circuit includes a temperature measuring section for measuring a temperature of switching elements forming a powering section, a motor speed detector for detecting a speed of a motor, a...
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7391181 |
Loss minimized PWM for voltage source inverters taking into account inverter non-linearity
A dynamic pulse width modulation (PWM) selection device automatically switches between discontinuous PWM (DPWM) control methods. The PWM selection device comprises a PWM control module. The PWM...
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7348755 |
Time sliced DSP operation for very high frequency pulse width modulated controllers
Methods and apparatus are provided for frequency scaling the PWM signal output of a controller/driver for an electrical device such as a BLDC motor. The apparatus comprises a number of multiple...
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7342380 |
System and method for adjustable carrier waveform generator
A system and method for controlling an inverter of a motor control unit includes a controller having a user interface configured to allow user selection of a waveform increment value or a waveform...
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7342379 |
Sensorless control systems and methods for permanent magnet rotating machines
Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a...
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7330011 |
Motor driving apparatus
A motor driving apparatus includes an inverter circuit for converting an output of a rectifier circuit connected to a single-phase AC power supply into a driving voltage, and outputting the driving...
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7327118 |
Electric machine and method of operating the electric machine
A method of and apparatus for controlling an electric machine. The method can include using a controller to detect whether power is present at a first node of the controller, detect whether power...
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7327111 |
System and method for parallel control of variable frequency drives
A method for controlling at least two variable frequency drives connected in parallel. The method comprises, for each variable frequency drive, communicating a magnetizing current component value...
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