In “Encoder and PC make complete motor-control system,” Steve Woodward of the University of North Carolina, Chapel Hill, NC describes how to build a a high-precision and high-power motion-control system.
It combines a simple ISA-bus-resident interface circuit; a garden-variety personal computer (PC); a high-resolution optical shaft encoder; and a PWM-controlled, 0.05-hp, brushed, permanent-magnet dc motor to make a high-precision and high-power motion-control system.
The system is designed to sequence through the precise rotation of an evacuated steel bell jar several feet in diameter, such as those used in molecular-beam spectroscopy
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