SPLIT-PHASE INDUCTION-MOTOR OPERATION FROM PWM VOLTAGE-SOURCE INVERTER

The operation of split-phase induction motors from pulse width modulat ed (PWM) voltage source inverters is examined in this paper. Splitting the phase windings leads to reduced voltage ratings for the inverter switches. As compared with seven positions for the space phasor of vol tage in three-phase machines, 48 different locations bounded by a 12-s ided polygon are possible in the split-phase machine. Based on space p hasor modulation, a three-phase inverter can give a maximum peak funda mental of 0.577 V-DC. In comparison, the split-phase configuration can provide an equivalent three-phase maximum peak fundamental of 0.643 V -DC with a dc bus voltage of 0.5 V-DC/cos15.