Power loss reduction of DC link capacitor for multi-phase Motor drive systems through shifted control

This paper shows a control strategy to improve energy consumption using a double three-phase Permanent Magnet Synchronous Motor. Focus is to significantly reduce the DC link power dissipation of the DC bus capacitor to exceed lifetime. In particular, shifted control technique is developed and implemented on a drive unit used in automotive industry to control the multi-phase fault-tolerant system. As a result, the DC link capacitor ripple current can be compensated by shifting the redundant three-phase systems towards each other. Conventional double three-phase PMSM is compared to the identical machine but with new control strategy. It is shown that the control strategy allows significant advantages without additional hardware and software measures.