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Experimental Investigation of Heat Pipe Inclination Angle Effect on Temperature Nonuniformity in Electrical Machines

Author

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  • Xiaochen Zhang

    (Advanced Electric Drive Centre, Yongjiang Laboratory, Ningbo 315202, China
    Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China)

  • Han Zhao

    (Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China)

  • Jing Li

    (Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China)

  • Fengyu Zhang

    (Power Electronics, Machines and Control Group, University of Nottingham, Nottingham NG7 2RD, UK)

  • Yue Zhang

    (Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China)

  • Hongyu Yan

    (Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China)

  • Zhihao Niu

    (Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China)

  • David Gerada

    (Power Electronics, Machines and Control Group, University of Nottingham, Nottingham NG7 2RD, UK)

  • He Zhang

    (Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China)

Abstract

Heat pipes (HPs) are gaining increasing popularity in the propulsion motors of transportation electrification due to their remarkable thermal properties. However, the inclination angle affects the HP thermal performance and, thus, results in temperature nonuniformity, which may generate unbalanced thermal stress on the motor. Such an issue has received less attention to date and requires corresponding solutions. This article performs an experimental investigation on motor temperature nonuniformity with HPs and further proposes an improved structure to address this problem. A specimen based on a stator-winding assembly with HPs is prepared and a dedicated experimental platform is established. Then, the temperature distribution across the specimen is studied, followed by an evaluation of the effects of current density and wind velocity. To compensate for the degradation of HP thermal performance, an improved structure with enlarged fins is proposed, and the equilibrium point is determined by fitting and comparing the obtained temperature data. Finally, the proposed structure is verified by the comparison between the original and improved specimens. The experimental results show that the non-uniform temperature distribution is significantly improved, with the temperature range and standard deviation reduced by 42% and 44.3%, respectively.

Suggested Citation

  • Xiaochen Zhang & Han Zhao & Jing Li & Fengyu Zhang & Yue Zhang & Hongyu Yan & Zhihao Niu & David Gerada & He Zhang, 2022. "Experimental Investigation of Heat Pipe Inclination Angle Effect on Temperature Nonuniformity in Electrical Machines," Energies, MDPI, vol. 16(1), pages 1-14, December.
    • Handle: RePEc:gam:jeners:v:16:y:2022:i:1:p:350-:d:1018002
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    References listed on IDEAS

    as
    1. Zhang, Shiwei & Chen, Jieling & Sun, Yalong & Li, Jie & Zeng, Jian & Yuan, Wei & Tang, Yong, 2019. "Experimental study on the thermal performance of a novel ultra-thin aluminum flat heat pipe," Renewable Energy, Elsevier, vol. 135(C), pages 1133-1143.
    2. Wei Le & Mingyao Lin & Keman Lin & Kai Liu & Lun Jia & Anchen Yang & Shuai Wang, 2021. "A Novel Stator Cooling Structure for Yokeless and Segmented Armature Axial Flux Machine with Heat Pipe," Energies, MDPI, vol. 14(18), pages 1-15, September.
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