article · Mathematics
Switched reluctance motors offer structural advantages for electric vehicles without relying on expensive rare-earth permanent magnets, but they are often hindered by high torque ripple and complex control demands. A newly formulated direct instantaneous torque control strategy addresses these challenges through a simple online torque estimator and a torque error compensator. In this approach, turn-on angles are defined analytically to support wide speed operation and maximise torque per ampere, while turn-off angles are optimised to reduce torque ripples and enhance motor efficiency. Performance comparisons with alternative methods, including average torque control and indirect instantaneous torque control using torque sharing functions, demonstrate that the proposed technique achieves the lowest torque ripples, the highest torque-to-current ratio, and the best efficiency across low and medium speeds. The findings also provide a basis for combining control methods across different speed ranges.
Rising electric vehicle production is driving up the cost of rare-earth permanent magnets. Switched reluctance motors offer a durable, magnet-free alternative, but uneven torque delivery has limited their adoption. By refining control algorithms to reduce torque ripples and increase energy efficiency, this research helps make magnet-free motor designs more practical and competitive for mainstream transportation applications.
The method is designed for electric vehicle powertrains and motor drive systems. Potential adopters include automotive manufacturers and motor drive developers seeking alternatives to permanent magnet drives. Based on the abstract, the research is at an applied stage focusing on control algorithm design and comparative performance analysis, meaning integration and real-world hardware validation on vehicle platforms would be required prior to commercial deployment.
AI-generated from the published abstract. Always read the original work before citing.
Due to the expected increase in the electric vehicles (EVs) sales and hence the increase of the price of rare-earth permanent magnets, the switched reluctance motors (SRMs) are gaining increasing research interest currently and in the future. The SRMs offer numerous advantages regarding their structure and converter topologies. However, they suffer from the high torque ripple and complex control algorithms. This paper presents an improved direct instantaneous torque control (DITC) strategy of SRMs for EVs. The improved DITC can fulfill the vehicle requirements. It involves a simple online torque estimator and a torque error compensator. The turn-on angle is defined analytically to achieve wide speed operation and maximum torque per ampere (MTPA) production. Moreover, the turn-off angles are optimized for minimum torque ripples and the highest efficiency. In addition, this paper provides a detailed comparison between the proposed DITC and the most applicable torque control techniques of SRMs for EVs, including indirect instantaneous torque control (IITC), using torque sharing function (TSF) strategy and average torque control (ATC). The results show the superior performance of the proposed DITC because it has the lowest torque ripples, the highest torque tor current ratio, and the best efficiency over the low and medium speed ranges. Moreover, the comparison shows the advantages of each control technique over the range of speed control. It provides a very clear overview to develop a universal control technique of SRM for EVs by merging two or more control techniques.
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DOI: 10.3390/math9040302
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