Motor motion detection circuit

Details Motor motion detection circuit Motor motion detection circuit

1992-01-03

1993-06-01

Arnold, Bruce Y.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

318685, 318696, G02B 2608, G05B 1940

Patent

active

052165337

ABSTRACT:
A circuit for detecting the motion of an oscillating motor driving a mirror for causing a light beam to scan. The circuit is included in a laser scanner for illuminating and reading bar codes, and detects the presence of conditions which prevent the motor from moving, such as a broken wire in a winding. The motor has two windings which are driven by a logic device to cause the motor to oscillate between two extreme angular positions. Each winding has two legs. The voltage on at least one of the legs is monitored when the leg is not being driven by the logic device, to detect the presence of an electromotive force voltage produced by motion of the motor. The monitored voltage is conditioned and transmitted to the logic device. In one embodiment, the monitored voltage is sampled twice and the two samples compared to provide an indication whether the motor is moving.

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