Design and Simulation of a Model Predictive Control System for a Novel Dual-Rotor Flux-Switching Permanent Magnet Motor

A model predictive current control (MPCC) system for a novel dual-rotor flux-switching permanent magnet motor (DRFSPMM) is proposed in this paper. According to the characteristics of the current phase angle difference between the inner and outer windings by 90°, the flux linkage is oriented by using two rotor position electrical angles. Thus the mathematical model equations in the dual-three-phase coordinate system are transformed to the dual-dq coordinate system. By discretizing the equations in the dual-dq coordinate system, the predicted current values are obtained to design the cost function. Besides, in the design of the control system, the torque distribution module is used to distribute the torque current to the inner and outer motors flexibly to achieve three different operation modes: outer motor priority, inner motor priority, and mixed operation mode. The effectiveness of the control system is validated by the simulation results.

I. Introduction

In recent years, owing to the advantages of high power factor, high efficiency, and high power density, permanent magnet synchronous motors have been widely used in various industrial applications, such as electric vehicles, wind power generation, aerospace, etc. With the development of motor technology, more and more novel high-performance permanent magnet motors come out, one of which is the dual-rotor flux-switching permanent magnet motor (DRFSPMM) [1], [2]. The DRFSPMM exhibits many advantages such as high torque density, high efficiency, simple and reliable rotor structure, high sinusoidal electromotive force and low torque ripple, making it suitable for application such as wind power generations and electric vehicles. However, when the motor is running, the phase angle of the currents in the dual-three-phase winding is strictly required, which makes it difficult to control. In order to solve this problem, a suitable motor control scheme needs to be designed to achieve high-performance control of the motor.