Analysis shows rotor design impacts efficiency, cogging torque, and torque ripple in IPM-BLDC motors, indicating that optimization improves stability.
This study investigates the influence of rotor design on the performance of interior permanent magnet brushless DC (IPM-BLDC) motors used in axial fan applications, which span from industrial cooling systems to automotive technologies. Two alternative rotor topologies with a 12/8 slot–pole configuration were analyzed using finite element analysis (FEA). The evaluation focused on key performance metrics, including torque ripple, cogging torque, and efficiency. The optimized flux-barrier rotor demonstrated a 55.36% reduction in cogging torque, a 1.23% improvement in efficiency, and a 2.23% decrease in torque ripple relative to the baseline design. Based on these results, the superior rotor geometry was prototyped, and the numerical findings were experimentally validated through performance testing. The outcomes confirm that rotor flux-barrier optimization enhances the overall efficiency and operational stability of IPM-BLDC motors in axial fan applications.
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Demirsoy et al. (2025) studied this question.
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