Model Predictive Thrust Force Control for Modular Permanent Magnet Synchronous Linear Motor Based on Multi-branch Inverter Topology

This paper presents the model predictive thrust force control (MPTFC) based on the multi-branch inverter for the modular permanent magnet synchronous linear motor (PMSLM). It focuses on the thrust force coordinated control of the modular PMSLM drive system for industry assembly line applications. The topology of the drive system and operating principle is investigated, and a discrete-time model of the modular PMSLM is established. Considering the multiple operating mode, the different multi-mode cost functions are designed by adopting optimal active voltage vector dwell time. The multiple weight coefficients are analyzed and chosen to optimize the operating demand of the drive system. The results indicate that the proposed MPTFC method reduces the thrust force ripple significantly, and the drive system has high efficiency and better steady performance compared to the conventional drive system.