Improved finite-control-set model predictive control algorithm for disc coreless permanent magnet synchronous motor based three-level NPC inverter

The disc coreless permanent magnet synchronous motor (DCPMSM) tend to have small inductance, and the current experiences stringent current ripple due to the IGBT's limited switching frequency. The MOSFET-based inverters can reduce the ripple by the high switching frequency, but it is not suitable to be applied in the high dc-link voltage (such as 510V) application because of its low voltage stress. A three-level neutral point clamped (NPC) inverter is proposed to drive DCPMSM in this paper. One improved finite-control-set model-predictive control (FCS-MPC) algorithm is proposed to reduce the calculation and the neutral-point voltage ripples. Comprehensive simulation and experimental results show that the proposed method can repress the current ripple by the small stator inductance, and get good neutral-point voltage balancing with low ripple.