A Space Vector-based Hybrid PWM Scheme to Minimize Peak-to-Peak Torque Ripple in Split-phase Induction Motor

A space vector (SV) based hybrid pulse width modulation (PWM) scheme for split phase induction motor with minimum torque ripple is proposed in this paper. The proposed PWM scheme utilizes four active voltage vectors along with zero vectors to realize the required reference voltage vector in the fundamental plane. However, in contrast to the conventional SVPWM scheme for split phase induction motor drive, the proposed scheme uses a special sequence of application of large vectors, which substantially reduces the torque ripple for a given switching frequency. The selection of voltage vector sequences in the proposed PWM scheme is based on extensive theoretical analysis using the concept of instantaneous error voltage vectors. The switching sequence which generates the minimum peak-peak torque ripple at any operating point is selected. Though this has been investigated in three-phase drives, it has not been explored in the case of split-phase induction motor drives. This is mainly attributed to the complexity of split-phase drive in terms of larger number of voltage vectors and multiple space vector planes. The validity and effectiveness of the proposed scheme are verified both theoretically as well as using extensive simulation carried out in Matlab/ Simulink platform.