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Class Information
Number: 318/810
Name: Electricity: motive power systems > Induction motor systems > Primary circuit control > Frequency control > With voltage pulse time control
Description: Subject matter wherein the voltage waveforms applied to the primary member of the motor is a pulse waveform having alternating positive and negative polarity portions, and the means to regulate the frequency of the voltage includes means to regulate the time at which the pulses are started and ended.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7403700 |
Motor control device |
Jul. 22, 2008 |
| 7308192 |
Motor drive control with a single current sensor using space vector technique |
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 |
| 7262579 |
Inverted electric motor and method for using such to propel a vehicle |
Aug. 28, 2007 |
| 7250740 |
Method and apparatus for generating pulse-width modulated waveform |
Jul. 31, 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 |
| 7161325 |
Lead-angle control method and device for operating permanent magnet synchronous motor in flux weakening regions |
Jan. 9, 2007 |
| 7148652 |
Method and apparatus for determining and handling brake failures in open loop variable frequency drive motors |
Dec. 12, 2006 |
| 7126305 |
Apparatus for correcting current value of three-phase electric motor and correcting method |
Oct. 24, 2006 |
| 7112940 |
Frequency converter, motor, motor drive system and maintenance method for motor drive system |
Sep. 26, 2006 |
| 7084604 |
Speed sensorless control of an induction machine using a PWM inverter with output LC filter |
Aug. 1, 2006 |
| 7064514 |
Motor drive system for AC motors |
Jun. 20, 2006 |
| 7045988 |
Sensorless controller of AC motor and control method |
May. 16, 2006 |
| 7042194 |
Controller for a wound-rotor induction motor |
May. 9, 2006 |
| 7034478 |
Digital spindle control architecture |
Apr. 25, 2006 |
| 7034501 |
Adjusting gate pulse time intervals for reflected wave mitigation |
Apr. 25, 2006 |
| 7026786 |
Reduced part count feedforward motor control |
Apr. 11, 2006 |
| 7023173 |
Apparatus for driving brushless motor and method of controlling the motor |
Apr. 4, 2006 |
| 7023172 |
Motor controller |
Apr. 4, 2006 |
| 7023168 |
Field weakening motor control system and method |
Apr. 4, 2006 |
| 6969963 |
PWM controlled motor drive |
Nov. 29, 2005 |
| 6952088 |
PSC motor system for use in HVAC applications with improved start-up |
Oct. 4, 2005 |
| 6933843 |
Data storage module for a security system |
Aug. 23, 2005 |
| 6914399 |
Active deadtime control for improved torque ripple performance in electric machines |
Jul. 5, 2005 |
| 6861815 |
Motor control drive circuit |
Mar. 1, 2005 |
| 6819070 |
Method and apparatus for controlling reflected voltage using a motor controller |
Nov. 16, 2004 |
| 6801013 |
PSC motor system for use in HVAC applications |
Oct. 5, 2004 |
| 6735537 |
Procedure for measuring the current in each phase of a three-phase device via single current sensor |
May. 11, 2004 |
| 6731095 |
Controller for multiplex winding motor |
May. 4, 2004 |
| 6710568 |
Motor drive device |
Mar. 23, 2004 |
| 6693406 |
Method of controlling a motor and a power supply apparatus |
Feb. 17, 2004 |
| 6680599 |
System for limitation of the output current from a speed controller |
Jan. 20, 2004 |
| 6678180 |
Power semiconductor module |
Jan. 13, 2004 |
| 6674258 |
Motor driver and motor drive method |
Jan. 6, 2004 |
| 6636012 |
Stator and rotor resistance identifier using high frequency injection |
Oct. 21, 2003 |
| 6611126 |
Injection molding machine capable of reducing power consumption |
Aug. 26, 2003 |
| 6605918 |
System and method for compensating the reading of noncontinuous AC sinusoidal currents |
Aug. 12, 2003 |
| 6597144 |
Method and apparatus for power loss detection and saving of operation settings in an appliance |
Jul. 22, 2003 |
| 6590361 |
Method and system for controlling an induction machine |
Jul. 8, 2003 |
| 6570361 |
Rotating induction apparatus |
May. 27, 2003 |
| 6552508 |
Apparatus and method for optimally controlling flux in an AC motor |
Apr. 22, 2003 |
| 6472843 |
System specific fluid flow control with induction motor drive |
Oct. 29, 2002 |
| 6469469 |
Variable output induction motor drive system |
Oct. 22, 2002 |
| 6459230 |
Method and system for measuring a parameter of motor operation |
Oct. 1, 2002 |
| 6437535 |
Starting system and method for a microturbine power generation unit |
Aug. 20, 2002 |
| 6414463 |
Method for measuring the speed of an induction machine |
Jul. 2, 2002 |
| 6384565 |
Method and apparatus for deriving characteristics of a utility signal in an AC machine drive system |
May. 7, 2002 |
| 6348775 |
Drive wave form synchronization for induction motors |
Feb. 19, 2002 |
| 6275000 |
Method of controlling an induction motor and apparatus for carrying out the same |
Aug. 14, 2001 |
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