Precision stop control for motors

Electricity: motive power systems – Positional servo systems – Adaptive or optimizing systems including 'bang-bang' servos

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Details

318592, 318594, 318603, G05B 1300, H02P 500

Patent

active

06013996&

ABSTRACT:
An improved stop control system and method are provided for a motor having a drive mechanism in which the motor is coupled to a motor controller that controls the speed and position of the drive mechanism using a first signal indicative of a commanded position of the drive mechanism, a second signal indicative of the actual speed of the drive mechanism and a third signal indicative of the actual position of the drive mechanism. The improved system/method uses a first circuit that receives the first and third signal and generates an error signal indicative of a difference therebetween. A second circuit receives the error signal and compares same with a threshold position error. The result of this comparison is used to selectively supply the second signal (i.e., speed) to the motor controller at least whenever the error signal is less than the threshold position error so that the motor controller can use the second signal in conjunction with the third signal to stop the motor.

REFERENCES:
patent: 3619757 (1971-11-01), Loerger
patent: 4063140 (1977-12-01), Kammerer et al.
patent: 4162438 (1979-07-01), Osder
patent: 4227137 (1980-10-01), Hartman
patent: 5090002 (1992-02-01), Chow et al.
patent: 5194788 (1993-03-01), Hashimoto
patent: 5318796 (1994-06-01), Torpey et al.
patent: 5404254 (1995-04-01), Kisaka
patent: 5444345 (1995-08-01), Jinnai
David E. Howard and Justino Montenegro, Antiovershoot Position Control for Motors Run at Full Speed, NASA Tech Briefs, Feb. 1988, vol. 22 #2, p. 4b Motion Control Tech Briefs.

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