Research of Sliding Mode Variable Structure Control of PMSM Based on Composite Reaching Law

Abstract

Based on permanent magnet synchronous motor as control object, from permanent magnet motor mathematical model based on composite variable rate reaching law sliding mode variable structure control technology. This control technique can shorten motor response time to rapidly reach a steady state, and this kind of compound gear sliding mode variable structure control of sliding mode surface can eliminate near the problem, at a distance from sliding surface of distal origin, system approach speed with close to sliding mode surface distance changes into sliding area, later, in a fixed scope, system reaching origin in steady state, simulation and experimental results have proved that this variable rate reaching law sliding mode control based on composite well solve chattering problem, and makes system quickly into steady state, parameter variations and load disturbances and has good robustness, permanent magnet synchronous motor can obtain very good position tracking effect.