Torque capability enhancement of dual three-phase PMSM drive with fifth and seventh current harmonics injection

This paper proposes a method for enhancing torque capability of a dual 3-phase permanent magnet synchronous machine (PMSM) drive system by injecting the fifth and seventh current harmonics without any hardware reconfiguration. In this approach, compared with the third current harmonic injection which is commonly used to enhance torque capability, the two isolated neutral points of the dual 3-phase machine do not need to be connected to the middle point of dc-link capacitors or an additional power switching bridge. Further, no additional current sensors to regulate the current harmonics are needed. For a prototype dual 3-phase PMSM the average torque was increased approximately by 9% at the cost of 0.56% increase in the 12th harmonic torque ripple. The effectiveness of the torque capability enhancement is confirmed by experiments.

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