Control circuit for step by step motor - gives large range of couple variation and or compensated for wide range of load variation

摘要

The control circuit is used for regulating the movement of a step by step motor having several active windings which are all connected so as to be sequentially exited by selectively actuated switching means. The system includes a series of voltage controlled oscillator circuits which are connected so as to activate the switching means at given time intervals. Also, it has means which function is response to the counter electromotive force which is produced by the active windings. The latter means are connected so as to vary the frequency of the oscillators in response to the variations of the counter electromotive force.