An alternative structure of the PMSM drive vector control

This paper considers a new system structure, which does not require current sensors for control and is optimized for medium- and small-power drives with strict requirements on precision. The main difference between traditional vector control and the proposed structure is a direct axis current compensator (DACC). DACC simplifies the control algorithms and cheapens the control hardware, in particular, making phase current sensors unneeded. Experimental results showing similarity of the traditional and proposed structures are presented. In conclusion, advantages and drawbacks of the proposed method are comprehensively analyzed.