Document Type : Original Research Paper

Authors

• Alireza Shams ¹
• Esmaeel Rokrok ¹
• Behrooz Rezaeealam ¹
• Abbas-Ali Zamani ²

¹ Electrical Engineering Department, Lorestan University, Khorramabad, Iran.

² Department of Electrical Engineering, Technical and Vocational University (TVU), Tehran, Iran.

Abstract

Background and Objectives: Interior permanent magnet synchronous machines (IPMSMs) have gained increasing attention in electric vehicle applications due to their high power density, desirable efficiency, and capability of delivering maximum torque over a wide speed range. Despite these advantages, challenges such as torque ripple and suboptimal efficiency remain. This study aims to propose a design and multi-objective optimization approach for Stator-Optimized Delta-Type IPMSM (SO-DT-IPMSM) motor to enhance efficiency, reduce torque ripple, and improve average torque.
Methods: A multi-objective particle swarm optimization (MOPSO) was employed to determine the optimal set of stator parameters. In this study, an existing delta-type IPMSM rotor topology was adopted and all rotor parameters were kept fixed, while the optimization was exclusively performed on stator geometry. Electromagnetic modeling and performance evaluation of the proposed design were carried out using Ansys Electronics. Following the optimization process, a prototype motor was manufactured and assembled based on the optimized design parameters, and experimental tests were conducted to validate the simulation results.
Results: Simulation results revealed significant improvements in the SO-DT-IPMSM compared with the Nissan Leaf IPMSM motor (Initial IPMSM). The optimized design achieved a 21% increase in average torque, 40% reduction in torque ripple, and 5% improvement in overall efficiency. Experimental tests performed on the fabricated prototype confirmed the accuracy of the simulation findings and demonstrated strong agreement between analytical and experimental data.
Conclusion: The proposed design and optimization approach effectively enhanced torque, torque ripple, and efficiency in the IPMSM. Beyond the validated experimental performance, the results demonstrate that the presented methodology can serve as a practical solution for improving electric vehicle motor performance. Moreover, the introduced optimization framework has the potential to be extended to other motor topologies and applications.

Keywords

• Interior Permanent Magnet Synchronous Motor (IPMSM)
• Electric Vehicle (EV)
• Optimization of Motor Efficiency (OME)
• Torque Ripple Reduction
• Multi- Objective Particle Swarm Optimization (MOPSO)

Main Subjects

• Electrical Machines

Open Access

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Publisher

Shahid Rajaee Teacher Training University