Research of position sensorless control for PMSM based on sliding mode observer and phase-locked loop

Abstract

In this paper, a sliding mode observer is presented for achieving the speed and position sensorless control based on estimating the rotor position of permanent magnet synchronous machines (PMSM). According to the PMSM mathematical model and the sliding mode observer (SMO) control theory, the SMO model is given. The stability condition of SMO is studied to make sure that the observer is stable in converging to the sliding mode plane. Compared to conventional sliding mode observer, the proposed observer based on sliding mode observer and phase-locked loop can effectively reduce the influence of the sliding mode chattering and improve the precision of the rotor position estimation. This paper analyses the structure and performance of the proposed SMO strategy with Simulink-based simulation. The simulation results show that the novel sliding mode observer is more effective than the conventional method.