Abstract
The flux-switching permanent-magnet (FSPM) motor has been viewed as a highly reliable machine with both armature windings and magnets on the stator. Owing to the high torque-production capability with low torque ripple, FSPM motors with a higher number of phases are potential candidates for traction applications in hybrid electric vehicles (HEVs). However, existing research has mostly focused on the principles and static performance of multiphase FSPM motors, and little attention has been paid to advanced control strategies. In this paper, the fully decoupled current control of a 36/34-pole nine-phase FSPM (NP-FSPM) motor is developed and the performance under different operating conditions is investigated. The aim of the design is to alleviate cross coupling effects and unwanted low-order stator harmonic currents, to guarantee fast transient response and small steady-state error. In addition, its fault-tolerance is further elaborated. These features are very important in automotive applications where low torque pulsation, high fault-tolerant capability and high dynamic performance are of major importance. Firstly, the research status of multiphase FSPM motors is briefly reviewed. Secondly, the mathematical model in the dq reference frames and control strategies are presented. Then, the control and performance of the NP-FSPM motor are evaluated by using MATLAB/Simulink. Finally, experiments on an NP-FSPM motor prototype are carried out to validate the study.
Highlights
Hybrid electric vehicles (HEVs) have attracted increasing attention owing to high demand for fuel-economy and environmentally friendly vehicles, which combine an internal combustion engine (ICE) and one or more electric motors [1,2,3]
By employing increased winding redundancy compared to three phases, the stator winding of the multiphase flux switching permanent magnet (FSPM) motor can keep on forming the circular rotating magnetic field when a fault occurs in one or even more phases [10]
The main current control technique presented for FSPM motors in the literature is hysteresis control [14,15], which provides a fast and simple solution for multiphase FSPM motor drives, but it uses variable switching frequency that results in unbalanced operation
Summary
Hybrid electric vehicles (HEVs) have attracted increasing attention owing to high demand for fuel-economy and environmentally friendly vehicles, which combine an internal combustion engine (ICE) and one or more electric motors [1,2,3]. In [12], design considerations for FSPM motors with five-phase 10/18-pole and 10/19-pole for high reliability applications were presented, showing that they inherently offer improved fault-tolerance and reduced PM material. The current research on multiphase FSPM motors has mainly focused on the structure, operating principles, and static torque performance. The main current control technique presented for FSPM motors in the literature is hysteresis control [14,15], which provides a fast and simple solution for multiphase FSPM motor drives, but it uses variable switching frequency that results in unbalanced operation. The controllability in post-fault operation is discussed Both simulation and experiments are conducted to verify the low torque pulsation, high fault-tolerant capability and high dynamic performance of the drive system
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