A Newly Designed VSC-Based Current Regulator for Sensorless Control of PMSM Considering VSI Nonlinearity

A novel d-axis variable-structure control (VSC) current regulator is proposed for realizing fast and accurate sensorless in the surface-mounted permanent magnet synchronous motor (SPMSM) this article. In regulator, sigmoid function employed as a switching law to reduce chattering effect increase degrees of freedom tuning regulator. The performance under VSC testified by using model reference adaptive system (MRAS) sliding-mode (SMC) method. MRAS observer, speed resistance designed so that resistance, speed, position can be estimated simultaneously, which eliminate influence variations theoretically. back electromotive force observer estimate PMSM estimation cover relative low-speed range because pure integration not employed. Furthermore, dead-time compensation voltages (DTCV) strategy online disturbance voltage feed-forward manner, improve PMSM. Experimental results obtained from an SPMSM drive validate superiority