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Comparative Study of Power Loss and Thermal Performance in Five-Phase FSCWPM Machine With/Without Third Harmonic Current Injection

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Abstract

Five-phase fractional slot concentrated winding permanent magnet (FSCWPM) machine with equal/unequal stator teeth can improve the torque density by added third harmonic current injection (Sin + 3rd). However, the injection of the third harmonic current will change the stator, rotor, and PM losses, and thus the thermal distribution. Therefore, it is necessary to conduct a comparative study on the losses and the thermal performances of the five-phase FSCWPM machine with the sine current supply and Sin + 3rd current supply. In this paper, the structures of the five-phase FSCWPM machines with equal/unequal stator teeth are illustrated, and their losses characteristic at different rotating speeds including copper loss, PM loss, and iron-core loss are comparatively analyzed under the same output torque constraint. Then, their thermal distributions are investigated based on the coupling of electromagnetic-thermal calculation of the 3D finite element (FE) method. The results demonstrate that the five-phase FSCWPM machines energized with the Sin + 3rd current have a better thermal performance at a low rotating speed, especially the five-phase FSCWPM machine with unequal stator teeth. Furthermore, the thermal experiment concerning a five-phase FSCWPM machine with unequal stator teeth is conducted to verify the validity of the related analysis.

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Authors and Affiliations

  1. North China University of Water Resources and Electric Power, Zhengzhou, China

    Haijun Chen & Tengteng Guo

  2. Changzhou Fuxing Electromechanical Co., Ltd, Changzhou, China

    Lufeng Zhang

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  1. Haijun Chen
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  2. Tengteng Guo
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  3. Lufeng Zhang
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Correspondence to Lufeng Zhang.

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Chen, H., Guo, T. & Zhang, L. Comparative Study of Power Loss and Thermal Performance in Five-Phase FSCWPM Machine With/Without Third Harmonic Current Injection. J. Electr. Eng. Technol. 16, 2099–2108 (2021). https://doi.org/10.1007/s42835-021-00745-1

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  • DOI: https://doi.org/10.1007/s42835-021-00745-1

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