DIGITAL CONTROL METHOD FOR SYNCHRONOUS MOTOR

摘要

PURPOSE:To provide a digital control method for synchronous motor, to be employed in industrial robot or machine tool, in which resonance with mechanical system is suppressed. CONSTITUTION:A decision is made that a mechanism system is vibrating transiently or continuously if the difference between positive and negative maximum values of sine wave current flowing through a synchronous motor 1 exceeds a predetermined value when the natural vibration frequency band of the mechanism system matches with a speed feedback value, and then the gain to be employed in the operation of speed control loop is regulated. Consequently, the mechanism system connected with the synchronous motor can be controlled stably without causing transient or continuous vibration even when the natural vibration frequency band of the mechanism system connected with the synchronous motor matches with the speed feedback value.