Smooth Switching Control of Sliding Mode and Passive Control for Permanent Magnet Synchronous Motor

Abstract

In the permanent magnet synchronous motor(PMSM) speed drive system, it is difficult to meet the requirement of good dynamic and static characteristics only by signal controller or engergy controller. In order to resolve this problem, this paper proposes a smooth switching control strategy based on signal and energy control principle. The signal controller adopts the sliding mode control method to speed up the dynamic response of the motor. The signal controller was designed based on sliding mode to improve the dynamic response performance of the motor. The energy controller was designed by using the Euler-Lagrange(EL) model of passive control method to improve the steady state characteristics of the motor. At last, the smooth switching function was used to combine the above methods together. In addition, considering the load torque is usually unknown, the load torque observer is introduced. Simulation was implemented by using MATLAB/Simulink, the simulation results show that the switching control strategy has satisfactory dynamic and steady state control performance.