Digital motor feedback for a position actuator

Details Digital motor feedback for a position actuator Digital motor feedback for a position actuator

1986-09-25

1988-07-12

Garrett, Robert A.

Motors: expansible chamber type

With signal, indicator or inspection means

92 5R, 73 1D, 91361, F01B 2526, F01B 3112

Patent

active

047562293

ABSTRACT:
A linear actuator (42) includes a housing (44), and a linearly displaceable piston (46) having a shaft (48) with a gradated position scale (60) and a gradated direction scale (62) disposed by ion implantation on a casing (50) of the shaft, in axial alignment (49) with the shaft stroke. Proximity sensors (64, 66) mounted in the housing sense movement in the position of the scales to provide sensed shaft position signals (68) and sense shaft direction signals (70).

REFERENCES:
patent: 2914756 (1959-11-01), Heidenhain et al.
patent: 3281825 (1966-10-01), Corl et al.
patent: 4471304 (1984-09-01), Wolf

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