A Damping Method of Rotor Natural Vibration in Three-Phase Hybrid Stepping Motors

Abstract

This paper proposes a damping method of rotor natural vibration in three-phase hybrid stepping motors, in which optimal commutation signals are calculated from the period of the natural vibration measured by detecting the motor voltages. Moreover, an acceleration and deceleration pattern is derived from a simple model of the rotor vibration, to suppress undesirable transient oscillation in acceleration. deceleration, and positioning operations. An experimental drive system has been implemented and tested to confirm the effectiveness and versatility of the proposed method. Some experimental results show that the experimental system can damp the rotor natural vibration even if the rotor inertia varies. Comparing with the conventional pattern, it is confirmed that the proposed pattern has great contribution to damp the undesirable transient oscillations.