Current control of permanent magnet synchronous machine with asymmetric phases

This paper presents a high performance current control method for permanent magnet synchronous machines having asymmetric three phase winding parameters, e.g., resistance asymmetric. The proposed method utilizes double synchronous reference frame in order to compensate the oscillation due to second order current harmonic. Positive and negative sequence voltage and current components have been investigated and controlled in their own reference frame simultaneously and independently. To verify the feasibility of the proposed method, both simulation and experimental results are provided, which show significant improvement in control performance compared with the conventional current control methods.