Electrical actuator with means for preventing dither at a...

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

G - Physics

05

D

G05D 3/10 (2006.01) H02P 7/00 (2006.01) H01H 7/00 (2006.01)

Patent

CA 2063869

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 planing 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.

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