Control of Chaos in Permanent-Magnet Synchronous Motor Based on Equivalent-Input-Disturbance Approach

Abstract

This paper observes a kind of chaos caused by the amplitude of load vibration in permanent-magnet synchronous motors (PMSMs), and presents a method of suppressing the chaos and controlling speed of a PMSM. The equivalent-input-disturbance (EID) approach is applied to construct a disturbance estimator compensating for the influence of load vibration and nonlinearities. The design procedure is illustrated by a numerical example. Simulation results show that the EID-based control method not only suppresses the chaos caused by the amplitude of load vibration, but also suppresses the chaos caused by the frequency of load vibration.