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Class Information
Number: 388/910
Name: Electricity: motor control systems > Specific control circuit element or device > Operational/differential amplifier
Description: Art collection of systems which include a circuit element or subsystem comprised of an operational or differential amplifier.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8157536 Rotating speed adjustment circuit and related control system for a heat dissipation fan Apr. 17, 2012
7787526 Circuits and methods for a multi-differential embedded-clock channel Aug. 31, 2010
7746019 Servo control circuit Jun. 29, 2010
7477704 Digital signal detection for high speed signaling systems Jan. 13, 2009
6850023 Method of measuring motor speed Feb. 1, 2005
6806669 Motor overload coil control Oct. 19, 2004
6188187 Apparatus and method of regulating the speed of a DC brushless motor Feb. 13, 2001
6154001 Anti-glitch circuit for voice-coil-motor servo operation in disk drive systems Nov. 28, 2000
6011902 Motor control circuit Jan. 4, 2000
5892347 Tape drive with high performance gain amplifier using radio frequency dielectric heating Apr. 6, 1999
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
5640073 Brushless dc motor unit and method of driving the unit Jun. 17, 1997
5625264 System for controlling a brushless DC motor Apr. 29, 1997
5600219 Sensorless closed-loop actuator unlatch Feb. 4, 1997
5473725 Method and device for controlling the speed of the brushless DC motor provided for an electric vehicle Dec. 5, 1995
5414792 Electric throttle and motor control circuitry May. 9, 1995
5404418 Closed-loop feedback control system having an adaptive filter Apr. 4, 1995
5397967 Slew rate circuit for high side driver for a polyphase DC motor Mar. 14, 1995
5367600 Motor control for a treadmill having improved power supply and improved speed regulation under intermittent loading Nov. 22, 1994
5364026 Ventilation fan control Nov. 15, 1994
5351336 Motor control having improved speed regulation under intermittent loading Sep. 27, 1994
5317669 Direct current motor speed control apparatus May. 31, 1994
5299277 Flexible disk drive device Mar. 29, 1994
5267344 Direct current power control circuit for use in conjunction with regulated input signal Nov. 30, 1993
5230035 Motor speed controller Jul. 20, 1993
5201023 Variable speed latching motor control Apr. 6, 1993
5179621 Direct current power control circuit Jan. 12, 1993
5123081 Temperature control system for motors and power components of a material handling vehicle Jun. 16, 1992
5086492 Switching current regulator for motor control Feb. 4, 1992
5046123 Error signal detection circuit in a servo control device Sep. 3, 1991
5029229 Direct current power control circuit Jul. 2, 1991
5010582 Pickup driving device for disk player Apr. 23, 1991
5003628 Variable speed D.C. motor control Mar. 26, 1991
4901366 Circuit arrangement for the timed control of semiconductor switches Feb. 13, 1990
4862048 Speed control system Aug. 29, 1989
4859918 Method and apparatus for producing a speed control voltage for direct current motors in typewriters or similar office machines Aug. 22, 1989
4851743 DC motor speed controller having protection Jul. 25, 1989
4851744 Feedback circuitry for D.C. motor speed control Jul. 25, 1989
4845412 Speed control apparatus for motor Jul. 4, 1989
4842190 Control circuit for a forced-air heating system Jun. 27, 1989
4843288 Phase locked motor control system for multiple disk drive units Jun. 27, 1989
4839570 Current limiting control circuit for d.c. motors Jun. 13, 1989
4837486 DC motor speed stabilizing method and apparatus Jun. 6, 1989
4833375 Digital motor control system May. 23, 1989
4829218 Direct current adjusting device May. 9, 1989
4827202 Method of and circuitry for automatically adjusting the variable-gain amplification in a control loop May. 2, 1989
4823056 Pulse-width modulation drive circuit Apr. 18, 1989
4806832 Fan with temperature controlled rotation speed Feb. 21, 1989
4804895 Charge balancing current sampler for a digital motor control Feb. 14, 1989
4804894 Motor rotation servo control apparatus Feb. 14, 1989

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