Novel pulse pattern for PWM double inverters with single shunt current detection to reduce torque ripple of Permanent Magnet Synchronous Motor (PMSM) is proposed. In the proposed pulse pattern, voltage vectors of double inverters at the timing of current detection are adjacent to each other and are changed based on the position of PMSM.
In this paper, the current error and the torque error due to single shunt current detection based on voltage equation of double three-phase wound PMSM are analyzed. Next, the pulse pattern to reduce the torque error is derived. Experimental results demonstrate that the proposed pulse pattern can reduce harmonics of torque waveforms.
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