Absolute magnetic encoder

Details Absolute magnetic encoder Absolute magnetic encoder

2006-04-04

2006-04-04

Ledynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S260000

Reexamination Certificate

active

07023203

ABSTRACT:
The encoder rotor of an absolute magnetic encoder mounted on a servomotor shaft has a first drum of a bipolar magnet, and a second drum with a Q-bit multipolar magnetic pole track and a reference track. A signal processor generates absolute signals on the basis of detected signals, which differ in phase by 90° and in which a single rotation represents a single period, from X-phase and Y-phase magnetic sensors disposed facing the first drum, and on the basis of A- and B-phase signals, which differ in phase by 90°, and a reference signal obtained from A-, B-, and Z-phase magnetic sensors disposed facing the second drum. Even if the number of bits Q of the multipolar magnetic pole track is increased in order to enhance the resolution, the number of magnetic pole tracks does not need to be increased, and higher resolution can therefore be obtained without increasing the axial length.

REFERENCES:
patent: 4262526 (1981-04-01), Makita et al.
patent: 4677377 (1987-06-01), Takahashi et al.
patent: 4694688 (1987-09-01), Takahashi et al.
patent: 4774464 (1988-09-01), Kubota et al.

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