Absolute position detection within 1 revolution using 3-channel

Details Absolute position detection within 1 revolution using 3-channel Absolute position detection within 1 revolution using 3-channel

1998-05-08

1999-12-07

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, G01D 534

Patent

active

059987847

ABSTRACT:
The quasi-absolute encoder module determines absolute position within one mechanical rotation. The encoder module includes a three channel position encoder and detection circuitry that includes a read-only memory (ROM). There are three channels: A, B, and I. Channels A and B have four periods and channel B is offset from channel A by 90.degree. in phase. Channel I has a unique sequence. The address generated by sampling this unique sequence corresponds to an address in ROM. The address indicates the position of the rotating shaft on which the code wheel is attached.

REFERENCES:
patent: 4194184 (1980-03-01), Hartmann et al.
patent: 4628298 (1986-12-01), Hafle et al.

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