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.