Position detectors provide motor-control logic - Embedded.com

Position detectors provide motor-control logic

In “Position detectors provide motor-control logic,” Steve Pomeroy and Russell Hedges of Elgar Corp describe a technique for use when a brush-type dc motor must drive a load back and forth between two endpoints on a lead screw.

In their approach, optical sensors determine end of travel, and an SPDT switch selects to which end to send the load. The sensors themselves supply all the necessary directional logic, and a triac powers the motor with the necessary polarity of half-wave pulses from the 13.5V-ac input.

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