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Class Information
Number: 318/807
Name: Electricity: motive power systems > Induction motor systems > Primary circuit control > Frequency control
Description: Subject matter wherein the circuit connected to the primary member of the motor includes means to regulate the frequency of the current or voltage supplied to the primary member.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7423401 |
AC rotary machine constant measuring apparatus for measuring constants of stationary AC rotary machine |
Sep. 9, 2008 |
| 7405534 |
Apparatus and method for controlling velocity of motor |
Jul. 29, 2008 |
| 7403404 |
Power inverter system and method of correcting supply voltage of the same |
Jul. 22, 2008 |
| 7403700 |
Motor control device |
Jul. 22, 2008 |
| 7400109 |
Inverter circuit and compressor |
Jul. 15, 2008 |
| 7391181 |
Loss minimized PWM for voltage source inverters taking into account inverter non-linearity |
Jun. 24, 2008 |
| 7348755 |
Time sliced DSP operation for very high frequency pulse width modulated controllers |
Mar. 25, 2008 |
| 7342379 |
Sensorless control systems and methods for permanent magnet rotating machines |
Mar. 11, 2008 |
| 7342380 |
System and method for adjustable carrier waveform generator |
Mar. 11, 2008 |
| 7339346 |
Motor and drive control device therefor |
Mar. 4, 2008 |
| 7330011 |
Motor driving apparatus |
Feb. 12, 2008 |
| 7327111 |
System and method for parallel control of variable frequency drives |
Feb. 5, 2008 |
| 7327118 |
Electric machine and method of operating the electric machine |
Feb. 5, 2008 |
| 7323845 |
Apparatus for controlling operation of compressor and method therefore |
Jan. 29, 2008 |
| 7317296 |
Electric motor |
Jan. 8, 2008 |
| 7307401 |
Method and apparatus for PWM control of voltage source inverter |
Dec. 11, 2007 |
| 7307400 |
Inverter operation with over-modulation |
Dec. 11, 2007 |
| 7304451 |
Motor control apparatus and method for generating modulation wave instruction of PWM inverter of the same motor control apparatus |
Dec. 4, 2007 |
| 7282886 |
Method and system for controlling permanent magnet motor drive systems |
Oct. 16, 2007 |
| 7282877 |
DC brush motor rotation amount detection method and apparatus |
Oct. 16, 2007 |
| 7271566 |
Method and system for managing the voltage on the DC bus of a speed controller for an AC motor |
Sep. 18, 2007 |
| 7271565 |
Apparatus for controlling speed of fan motor of air-conditioner |
Sep. 18, 2007 |
| 7268516 |
Circuit for use with switched reluctance machines |
Sep. 11, 2007 |
| 7265506 |
Noise improved linear DC motor control systems and methods |
Sep. 4, 2007 |
| 7265511 |
Motor control device |
Sep. 4, 2007 |
| 7262577 |
Method for estimating the sum of stator and rotor resistances |
Aug. 28, 2007 |
| 7240761 |
Electric power steering apparatus |
Jul. 10, 2007 |
| 7230394 |
Apparatus and method for controlling motor in washing machine |
Jun. 12, 2007 |
| 7227331 |
Safety interlock and protection circuit for permanent magnet motor drive |
Jun. 5, 2007 |
| 7224141 |
Position controller of motor |
May. 29, 2007 |
| 7221121 |
Frequency converter for different mains voltages |
May. 22, 2007 |
| 7221122 |
Inverter control device |
May. 22, 2007 |
| 7211984 |
Start-up and restart of interior permanent magnet machines |
May. 1, 2007 |
| 7211985 |
Training device |
May. 1, 2007 |
| 7197410 |
Predicting loss of frequency lock between a motor control circuit and a motor |
Mar. 27, 2007 |
| 7193388 |
Offset PWM signals for multiphase motor |
Mar. 20, 2007 |
| 7190143 |
Pulse width modulation (PWM) rectifier with variable switching frequency |
Mar. 13, 2007 |
| 7187155 |
Leakage inductance saturation compensation for a slip control technique of a motor drive |
Mar. 6, 2007 |
| 7180263 |
Synchronous motor control method and device |
Feb. 20, 2007 |
| 7176652 |
Motor control apparatus |
Feb. 13, 2007 |
| 7176653 |
Electric motor drive |
Feb. 13, 2007 |
| 7170283 |
Device for detecting a position of a magnetic pole |
Jan. 30, 2007 |
| 7154244 |
Steering apparatus |
Dec. 26, 2006 |
| 7151354 |
Magnetic noise reduction method for AC rotary electric machine, and motor control apparatus and AC rotary electric machine apparatus using the same |
Dec. 19, 2006 |
| 7148651 |
Apparatus and method for controlling AC motor and module therefor |
Dec. 12, 2006 |
| 7148650 |
Maximum power point motor control |
Dec. 12, 2006 |
| 7148652 |
Method and apparatus for determining and handling brake failures in open loop variable frequency drive motors |
Dec. 12, 2006 |
| 7145310 |
Method and system for controlling permanent magnet synchronous motor |
Dec. 5, 2006 |
| 7141948 |
Electromotive power steering system |
Nov. 28, 2006 |
| 7135834 |
Modified field oriented control |
Nov. 14, 2006 |
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