Space Vector PWM With Common-Mode Voltage Reduction for Six-Phase Drive

Common-mode voltage (CMV) is one of the major reasons for electromagnetic interference. Its destructive effects on the machine windings, insulation is well known and it is one of the major sources of bearing failure in variable speed drives. Extensive analysis on CMV have been reported in previous literature in case of three-phase machine fed by voltage source inverter. Pulse width modulation has produced reduced CMV at the cost of increased current distortion and have been studied extensively during the last two decades or so. Specific advantage offered by multiphase machine, makes it suitable candidate for high power application. The common mode voltage issue is as prevalent as it is in case of its three-phase counterpart. This paper analyses the Common-mode voltage (CMV) produced by the two level six-phase voltage source inverter fed multi-phase machine and proposes a modified PWM technique for its reduction