Permanent-Magnet Synchronous Motor (PMSM) is widely used in the electric vehicle (EV) industry. Due to the instability and the cost of the position sensor, massive studies have been done to achieve the control without position sensor on PMSM. This paper analyzes the switching process from I/F strategy to Sliding Mode Observer (SMO) strategy in details, and also introduces the framework of I/F strategy with model predictive controller (MPC) as well as SMO used in the model. Furthermore, a new optimization algorithm called Angle Weighting Switching Strategy (AWSS) is proposed to smooth the transition process so as to mitigate the current-jitter and reduce speed fluctuation. Moreover, simulation between conventional switching method and the proposed method has been done to validate the effectiveness and robustness of the proposed control algorithm.

MPC, PMSM, I/F, SMO, switching method, AWSS