Digital control circuit for polyphase motor - has microprocessor using rotor position to control connection of phase windings to DC source

摘要

The digital control circuit connects the motor's phase windings to a d.c source depending on the position of the rotor. Signals describing the rotor's angular position are also used to count the separate steps of the motor in an electronic memory. Counting is up or down depending on the direction of the rotor's rotation. Each phase has its own rotor-position detector which consists of an opto-electronic device. The control circuit is part of a microprocessor. The signals describing rotor position are code words with as many bits as there are position detectors.