Electrical actuator with means for preventing dither at a limit

Details Electrical actuator with means for preventing dither at a limit Electrical actuator with means for preventing dither at a limit

1991-04-01

1992-01-14

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Anti-hunting

318286, 307134, G05B 501

Patent

active

050814052

ABSTRACT:
The tendency of a motor-driven actuator driving against a dynamic (non-frictional) load to return upon reaching the limit switch sufficiently to again close the limit switch and create a persistent oscillation at the limit position can be prevented by placing a positive temperature coefficient thermistor across the limit switch involved. Such loads typically arise in actuators having spring-driven return capability, and can also arise when positioning air dampers and other loads where the actuator force is opposed by a spring or gravity.

REFERENCES:
patent: 4087728 (1978-05-01), Porter
patent: 4131831 (1978-12-01), Bochenek et al.
patent: 4438472 (1984-03-01), Woodworth
patent: 4583146 (1986-04-01), Howell
patent: 4833376 (1989-05-01), Shimura
patent: 4888537 (1989-12-01), Appel et al.
patent: 4972129 (1990-11-01), Kawai et al.
Bulletin T-787 of the Keystone Carbon Company, St. Marys, PA 15857--PTC Thermistor, pp. 38 and 39.

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