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Class Information
Number: 388/928.1
Name: Electricity: motor control systems > Specific feedback condition or device > Counter or back emf (cemf)
Description: Art collection of systems in which an opposing voltage, i.e., counter electromotive force or CEMF, induced in an armature winding, by virtue of the armature"s motion within the magnetic field of a field winding is used as a feedback signal in controlling a motor.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7423396 |
Hall sensor alignment for BLDC motor |
Sep. 9, 2008 |
| 7372224 |
System and method for determining barrier motor parameters without using sensors |
May. 13, 2008 |
| 7268503 |
Vibration linear actuating device, method of driving the same device, and portable information apparatus using the same device |
Sep. 11, 2007 |
| 7242160 |
Starting method for Hall-less single-phase BLDCM |
Jul. 10, 2007 |
| 7230358 |
Electrical resonance circuits for high efficiency direct current motors |
Jun. 12, 2007 |
| 7166980 |
Methods and apparatus for monitoring a brushed permanent magnet motor using back-emf measurements |
Jan. 23, 2007 |
| 7141949 |
Low noise back EMF sensing brushless DC motor |
Nov. 28, 2006 |
| 6995530 |
System, method, and an article of manufacture for starting a brushless direct current motor |
Feb. 7, 2006 |
| 6956342 |
Driving circuit for a DC brushless fan motor |
Oct. 18, 2005 |
| 6901212 |
Digital adaptive sensorless commutational drive controller for a brushless DC motor |
May. 31, 2005 |
| 6885163 |
Method for starting a brushless d.c. motor |
Apr. 26, 2005 |
| 6876169 |
Method and controller for field weakening operation of AC machines |
Apr. 5, 2005 |
| 6870337 |
Methods and apparatus for maintaining synchronization of a polyphase motor during power interruptions |
Mar. 22, 2005 |
| 6859000 |
Device for position determination in sensorless motors |
Feb. 22, 2005 |
| 6859001 |
Torque ripple and noise reduction by avoiding mechanical resonance for a brushless DC machine |
Feb. 22, 2005 |
| 6850022 |
Method and system for determining electronic commutation in brushless DC machines irrespective of the placement of rotor position sensors |
Feb. 1, 2005 |
| 6836092 |
Methods and circuits for detecting operational information of DC Fans |
Dec. 28, 2004 |
| 6741049 |
Low voltage start up circuit for brushless DC motors |
May. 25, 2004 |
| 6724162 |
Motor-control device enabling the rotational speed of the motor's rotor to be measured |
Apr. 20, 2004 |
| 6721496 |
Electrical resonance circuits for high efficiency direct current motors |
Apr. 13, 2004 |
| 6717380 |
Method for shifting the instant of commutation for a sensorless and brushless direct-current motor as well as a system for implementing the method |
Apr. 6, 2004 |
| 6703805 |
System for measuring the position of an electric motor |
Mar. 9, 2004 |
| 6664749 |
Spindle motor initialization after a control processor reset condition in a disc drive |
Dec. 16, 2003 |
| 6633145 |
Circuit for improved back EMF detection |
Oct. 14, 2003 |
| 6608458 |
Electric motor, in particular wiper motor |
Aug. 19, 2003 |
| 6580236 |
Brushless motor drive circuit having low noise and high efficiency |
Jun. 17, 2003 |
| 6518719 |
Power tools with operating speed control circuit |
Feb. 11, 2003 |
| 6512346 |
Motor driving apparatus |
Jan. 28, 2003 |
| 6504328 |
Sensorless motor driver with BEMF mask extender |
Jan. 7, 2003 |
| 6433496 |
Semiconductor integrated circuit for motor control |
Aug. 13, 2002 |
| 6420847 |
Device for detection of current or voltage on a PWM driven winding with reduced jitter and related methods |
Jul. 16, 2002 |
| 6380703 |
Digital PLL filter and VCO for use in controlling a spindle motor of a mass data storage device |
Apr. 30, 2002 |
| 6377008 |
Motor driving device |
Apr. 23, 2002 |
| 6215261 |
Application specific integrated circuit for controlling power devices for commutating a motor based on the back emf of motor |
Apr. 10, 2001 |
| 6184645 |
Voltage mode drive for control circuit for an actuator using sampled back EMF control |
Feb. 6, 2001 |
| 6084377 |
Voltage vector overmodulation technique considering counter electromotive force of motor |
Jul. 4, 2000 |
| 6054825 |
Method and apparatus for high voltage generation |
Apr. 25, 2000 |
| 6040671 |
Constant velocity control for an actuator using sampled back EMF control |
Mar. 21, 2000 |
| 6034496 |
Motor speed control using fixed-duration torque bursts |
Mar. 7, 2000 |
| 5818179 |
Brushless motor drive circuit including a linear amplifier for sending an output signal based upon the detected back electromotive force voltage |
Oct. 6, 1998 |
| 5811946 |
System and method for velocity control of a D.C. Motor |
Sep. 22, 1998 |
| 5789895 |
BEMF crossing detection in PWM mode operation for sensorless motor control application |
Aug. 4, 1998 |
| 5786679 |
DC motor driven power steering system for a motor vehicle |
Jul. 28, 1998 |
| 5783920 |
Error signal control circuit for a phase-lock-loop sensorless motor controller |
Jul. 21, 1998 |
| 5761375 |
Brushless motor speed detection device |
Jun. 2, 1998 |
| 5689159 |
Surgical tool system with brushless, sensorless motor |
Nov. 18, 1997 |
| 5672948 |
Digital, Back EMF, single coil sampling, sensorless commutator system for a D.C. motor |
Sep. 30, 1997 |
| 5659231 |
Brake for DC brushless motor |
Aug. 19, 1997 |
| 5600219 |
Sensorless closed-loop actuator unlatch |
Feb. 4, 1997 |
| 5569994 |
Method and apparatus for sensorless control of permanent-magnet synchronous motors |
Oct. 29, 1996 |
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