An Improved Model-Predictive Torque Control of Switched Reluctance Motor Based on Sector Adaptive Allocation Technology

In view of the disadvantages of negative torque and large torque ripple under different operating conditions in the traditional model-predictive torque control (MPTC), an improved MPTC of a switched reluctance motor based on a sector adaptive allocation technique is proposed in this article. First, considering the problem of negative torque under high speed and heavy load, a novel sector allocation principle is proposed to effectively limit the torque ripple and negative torque. The preselected voltage vector is redesigned, and its number is minimized, which effectively reduces the computation of MPTC. Second, the calculation method for the optimal angle is proposed to change the position and width of the sector, the width of the sector is calculated by the method of grasping the angle of the special position, and the position of the sector is determined by the calculation function of the turn-on and turn-off angles. By combining the optimum angle calculation method with sector allocation, the sector adaptive allocation technique is realized, which enables the proposed algorithm to adaptively adjust under various operating conditions. Finally, simulation and experimental results have verified that the proposed method can be applied to various operating conditions with lower torque ripple and higher torque–ampere ratios compared to some other improved MPTC methods.

I. Introduction

Switched reluctance motors (SRMs) have received high attention due to fault tolerance, reliable power topology, low cost, and wide speed range and have been widely applied in industries such as aerospace, household appliances, and transport electrification. However, the drawbacks such as large torque ripple and vibration compared to mainstream permanent magnet motors limit the application of SRMs in certain high-performance and demanding applications, such as electric vehicles, aeronautical generators, and so on. Therefore, it is crucial to develop a high-performance control method for torque ripple suppression [1], [2], [3], [4], [5].