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 sub-spaces and CMV using Matlab/Simulink software.