Space Vector Modulation for Six-Phase Open-End Winding PMSM Motor Drives with Common Mode Voltage Suppression

This paper proposes a space vector modulation algorithm for an asymmetrical six-phase open-end winding permanent magnet synchronous motor (OEWPMSM) supplied by two two-level six-phase voltage source inverters(VSIs) with common mode voltage suppression. The VSIs are fed from two equal and isolated DC voltages. A six-phase open-end winding PMSM model is developed based on the vector space decomposition (VSD) technique. The voltage concept, namely, common mode voltage (CMV) is investigated in the drive system. A space vector pulse width modulation (SVPWM) method is then proposed which is capable of not only suppressing the current harmonics in non-torque producing sub-spaces, but also eliminating the CMV. The performance of the proposed PWM technique is evaluated using total harmonic distortion of motor voltage and current, the current components in different subspaces and CMV using Matlab/Simulink software.