Rotating high-resolution shaft encoder utilizing capacitive sens

Details Rotating high-resolution shaft encoder utilizing capacitive sens Rotating high-resolution shaft encoder utilizing capacitive sens

1987-06-18

1989-09-05

Shoop, Jr., William M.

Coded data generation or conversion

Digital pattern reading type converter

With directional discrimination

318254, 341 15, 341 16, 310 905, 310266, H03M 148

Patent

active

048643009

ABSTRACT:
A high-resolution shaft encoder and a related encoding method for accurately measuring angular position and velocity of rotating shafts. The high-resolution shaft encoder includes an annular-shaped actuator ring that rotates at high speed, a shaft centered within the actuator ring, and an encoder housing. The shaft encoder generates measurements of shaft position .theta..sub.p and velocity .omega..sub.p, with respect to the encoder housing, from measurements of three time intervals t.sub.p, t.sub.r and .DELTA.t. These time interval measurements are computed from the output of a sensor element positioned on the shaft and a sensor element positioned on the encoder housing, both of which respond to an input actuation element positioned on the rotating actuator ring.

REFERENCES:
patent: 2901170 (1959-08-01), Poole
patent: 4463276 (1984-07-01), Nakamura
patent: 4686404 (1987-08-01), Nakazeki et al.
patent: 4720698 (1988-01-01), Brooke et al.

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