Current control of permanent magnet synchronous machine with asymmetric phases

This presentation describes a high-performance current control method for permanent-magnet synchronous machines having asymmetric three-phase winding parameters, e.g. asymmetric resistance. The proposed method utilizes a double synchronous reference frame in order to compensate for the oscillation due to second-order current harmonics. 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.