Method for controlling speed of pulse motor

Abstract

Abstract PURPOSE:To perform stable speed control by exciting an exciting phase at the stable point of the step next to the present position when the speed is slower than the reference speed, and by exciting the exciting phase at the stable point one step before the present position when the speed is faster. CONSTITUTION:A position signal is generated by a position detector PD and a position-signal generator PG at the stable point of a pulse motor M, and is input to a pulse-motor controller C together with the signals from a speed-signal generator VG and a speed-zero detector ZD. A reference-speed designating voltage is generated from the reference-speed designating signal of the controller C, compared with a speed signal VE in a comparator COM, and supplied to a driver circuit DU. If the speed is slower than the reference speed, the exciting phase is excited in the direction the torque is advanced. If the speed is faster than the reference speed, the exciting phase is excited in the direction the torque is delayed. Since the feedback is always applied, the stable braking can be accomplished without the influence of the vibration and the dispersion of the load values.

Inventors

• 👤 Hiroshi Koide

Bibliographic Details