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Class Information
Number: 388/921
Name: Electricity: motor control systems > Specific control circuit element or device > Timer or time delay means
Description: Art collection of systems which include a circuit element or subsystem whose function is to measure time intervals or to determine start or stop times for electrical signals.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7421301 |
Speed-variable maximum delay clamping when using variable-delay random PWM switching |
Sep. 2, 2008 |
| 7183731 |
Pulse generating method and pulse generator, and motor control system using the same |
Feb. 27, 2007 |
| 6995531 |
Direct current motor drive circuit and fan motor including the same |
Feb. 7, 2006 |
| 6922037 |
Rotating induction apparatus |
Jul. 26, 2005 |
| 6804562 |
Method and apparatus for overload-free driving of an actuator |
Oct. 12, 2004 |
| 6369560 |
Handleable working device, in particular pressing device |
Apr. 9, 2002 |
| 6323611 |
Circuit for operating an electric motor |
Nov. 27, 2001 |
| 6191546 |
Proportional integral cooling device controller for electronic device |
Feb. 20, 2001 |
| 6046562 |
Security system for automatic door |
Apr. 4, 2000 |
| 5825141 |
Motor control apparatus |
Oct. 20, 1998 |
| 5731675 |
Adjustable motor control circuit for power windows |
Mar. 24, 1998 |
| 5657417 |
Control for battery powered tool |
Aug. 12, 1997 |
| 5640073 |
Brushless dc motor unit and method of driving the unit |
Jun. 17, 1997 |
| 5610594 |
Frequency monitoring device |
Mar. 11, 1997 |
| 5471122 |
DC-motor bridge driver with end-of-braking detector |
Nov. 28, 1995 |
| 5469148 |
Frequency monitoring device |
Nov. 21, 1995 |
| 5445017 |
Motor start examining device and method |
Aug. 29, 1995 |
| 5345159 |
Method of controlling printer |
Sep. 6, 1994 |
| 5115172 |
Phase locked loop speed control circuit for controlling speeds and relative positions of objects |
May. 19, 1992 |
| 5111124 |
Continuous deadbeat control system with feedback control |
May. 5, 1992 |
| 4952080 |
Automatic assist for swing-door operator |
Aug. 28, 1990 |
| 4933985 |
Rotation drive device |
Jun. 12, 1990 |
| 4910789 |
Apparatus for controlling the adjustment rate of a lens assembly |
Mar. 20, 1990 |
| 4901366 |
Circuit arrangement for the timed control of semiconductor switches |
Feb. 13, 1990 |
| 4879754 |
Speed controller |
Nov. 7, 1989 |
| 4851744 |
Feedback circuitry for D.C. motor speed control |
Jul. 25, 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 |
| 4833379 |
Motor control fail-safe circuit |
May. 23, 1989 |
| 4831313 |
Two speed motor controller |
May. 16, 1989 |
| 4829230 |
Motor control circuit for accurate speed control with capacitor leakage compensation |
May. 9, 1989 |
| 4804894 |
Motor rotation servo control apparatus |
Feb. 14, 1989 |
| 4804895 |
Charge balancing current sampler for a digital motor control |
Feb. 14, 1989 |
| 4803410 |
Variable duty ratio speed controller for DC motors |
Feb. 7, 1989 |
| 4803568 |
Motor control apparatus effecting phase control on rotating body |
Feb. 7, 1989 |
| 4780654 |
Control apparatus for drilling machine |
Oct. 25, 1988 |
| 4774444 |
Speed control circuit for an electric motor |
Sep. 27, 1988 |
| 4772805 |
Lamp illumination adjusting apparatus |
Sep. 20, 1988 |
| 4769582 |
Low vibration pulse drive device for an electric motor |
Sep. 6, 1988 |
| 4755729 |
Method of controlling a control system with improved robustness to disturbances |
Jul. 5, 1988 |
| 4752723 |
Chopper control system |
Jun. 21, 1988 |
| 4748389 |
Motor speed control apparatus |
May. 31, 1988 |
| 4739230 |
Control device for controlling motor speed without hunting |
Apr. 19, 1988 |
| 4736143 |
Torque control apparatus for rotary machine |
Apr. 5, 1988 |
| 4734629 |
Variable speed trigger switch |
Mar. 29, 1988 |
| 4698567 |
Ribbon deck motor control |
Oct. 6, 1987 |
| 4695779 |
Motor protection system and process |
Sep. 22, 1987 |
| 4695781 |
Digital time interval measuring apparatus |
Sep. 22, 1987 |
| 4693197 |
Sewing machine apparatus with improved shaft speed measuring and indicating means |
Sep. 15, 1987 |
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