Modulating Functions of Space Vector PWM for Three-Leg VSI-Fed Unbalanced Two-Phase Induction Motors

Modulating functions or space-vector-equivalent references of a carrier-based unbalanced two-phase output space vector pulsewidth modulation (SVPWM) strategy applied to a three-leg voltage source inverter are proposed in this letter. These functions are derived from a conventional balanced two-phase SVPWM method. The proposed SVPWM method is implemented using a DS1104 dSPACE controller board. With the proposed method, the appropriate voltages for both windings of an asymmetrical-parameter-type two-phase induction motor can be achieved for improving the motor performance. Experimental and calculated results confirm the validity of the proposed method.