Modified MPC Algorithm for NPC Inverter Fed Disc Coreless Permanent Magnet Synchronous Motor

The disc coreless permanent magnet synchronous motor (DCPMSM) has suffered some stringent current ripple for its small phase inductance. The metal-oxide-semiconductor field-effect transistor (MOSFET)-based inverters can reduce this ripple by the help of its high switching frequency. However, due to the low voltage stress, the MOSFET is not suitable to the high dc-link voltage applications. A three-level neutral point clamped inverter is proposed to drive DCPMSM in this paper. Moreover, a modified finite-control-set model-predictive control (FCS-MPC) algorithm is proposed to reduce the calculation and the neutral-point voltage ripples. Comprehensive simulation and experiments show that the proposed method can repress the current ripple and the neutral-point voltage ripple effectively.