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Machine Design

Hollow-Shaft Encoders

A modular hollow-shaft encoder offers extremely easy installation


and is designed to provide two channels of incremental shaft position at 500 lines/rev in quadrature with an index pulse. This RS-422 output differential line driver device uses a single LED emitter/receiver for high reliability, as well as a sturdy glasscode disk mounted on an aluminum hub. The emitter/receiver assembly mounts to the motor using two screws. The low-profile design only adds 0.45 in. to the shaft length. Overall case diameter is 35 mm. Other sizes and resolution configurations are available.

Servo Magnetics Inc.,
6660 Variel Ave., Canoga Park, CA 91303,
(800) 457-3786,

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