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Class Information
Number: 388/915
Name: Electricity: motor control systems > Specific control circuit element or device > Sawtooth or ramp waveform generator
Description: Art collection of systems which include a circuit element whose function is to generate a repetitious wave with linear rising, or falling, slope.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
7750585 Asymmetric control system for a sensorless and brushless electric motor Jul. 6, 2010
6810202 Apparatus for controlling rotational speed of motor Oct. 26, 2004
6703803 Fan motor driving circuit Mar. 9, 2004
6353705 Speed control circuit of a direct current motor Mar. 5, 2002
6072293 Steering control system for vehicle Jun. 6, 2000
5852632 Recovery of the propagation delay in a PWM circuit Dec. 22, 1998
5640073 Brushless dc motor unit and method of driving the unit Jun. 17, 1997
5554913 Blower system for vehicle air-conditioners Sep. 10, 1996
5375186 Device for speed stabilization of a motor employing phase comparison Dec. 20, 1994
5267344 Direct current power control circuit for use in conjunction with regulated input signal Nov. 30, 1993
5260634 Constant current driving system for a stepper motor in rotating disk Nov. 9, 1993
5261025 Method and apparatus for DC motor speed control Nov. 9, 1993
5179621 Direct current power control circuit Jan. 12, 1993
5046123 Error signal detection circuit in a servo control device Sep. 3, 1991
5040235 Battery powered motor speed control apparatus Aug. 13, 1991
5029229 Direct current power control circuit Jul. 2, 1991
4990002 Motor control circuit Feb. 5, 1991
4965848 Control circuit for a permanent magnet or constant excitation direct current motor, particularly for washing machines Oct. 23, 1990
4949393 Motor rotation speed controlling apparatus Aug. 14, 1990
4901366 Circuit arrangement for the timed control of semiconductor switches Feb. 13, 1990
4871952 Motor speed control apparatus Oct. 3, 1989
4845412 Speed control apparatus for motor Jul. 4, 1989
4843288 Phase locked motor control system for multiple disk drive units Jun. 27, 1989
4841165 D. C. power controller Jun. 20, 1989
4839570 Current limiting control circuit for d.c. motors Jun. 13, 1989
4831313 Two speed motor controller May. 16, 1989
4828395 Continuous flow type homogenizer May. 9, 1989
4827201 Digital servo system for motor driven apparatus May. 2, 1989
4823056 Pulse-width modulation drive circuit Apr. 18, 1989
4816723 Variable speed motor control method and apparatus Mar. 28, 1989
4804895 Charge balancing current sampler for a digital motor control Feb. 14, 1989
4804894 Motor rotation servo control apparatus Feb. 14, 1989
4780654 Control apparatus for drilling machine Oct. 25, 1988
4772805 Lamp illumination adjusting apparatus Sep. 20, 1988
4755892 Method of and apparatus for displacing a movable system driven by an electric motor along a given trajectory Jul. 5, 1988
4739230 Control device for controlling motor speed without hunting Apr. 19, 1988
4734630 Method and apparatus for phase comparison adapted to produce an error signal against an input signal having a relatively wide range of phase and frequency variation Mar. 29, 1988
4734629 Variable speed trigger switch Mar. 29, 1988
4733146 Energy recovery system for cyclic drives Mar. 22, 1988
4719395 Variable speed control switch for an electric tool including a DC motor Jan. 12, 1988
4710825 Disc recording system with speed control Dec. 1, 1987
4694234 Apparatus for compensating a quantization error Sep. 15, 1987
4684863 Semiconductor wafer boat loader control system Aug. 4, 1987
4684859 Chopper control system Aug. 4, 1987
4668900 Digital servo apparatus May. 26, 1987
4652799 Apparatus for driving a recording medium at a constant speed relative to a pickup device Mar. 24, 1987
4638225 Method and apparatus therefor in motor speed control Jan. 20, 1987
4635927 Low power treadmill Jan. 13, 1987
4631462 System for controlling the speed of an electric motor Dec. 23, 1986
4628314 Method and apparatus for detecting position and velocity of moving body Dec. 9, 1986

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