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Study of Injection Method for Maximizing Oil-Cooling Performance of Electric Vehicle Motor with Hairpin Winding

Author

Listed:
  • Taewook Ha

    (School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Korea)

  • Dong Kyu Kim

    (School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Korea
    School of Computer Science and Engineering, Chung-Ang University, Seoul 06974, Korea)

Abstract

The oil injection method was studied to maximize the cooling performance of an electric vehicle motor with a hairpin winding. The cooling performance of the motor using the oil cooling method is proportional to the contact area of the oil and the coil. A numerical analysis was conducted to examine the effect of the spray nozzle type on the oil flow. The dripping nozzle forms the thickest oil film on the coil, making it the most effective for cooling of hairpin-type motors. Subsequently, an experimental study was conducted to optimize the nozzle diameter and number of nozzles. When the inlet diameter and number was 6.35 mm and 6, the oil film formation rate was 53%, yielding the most uniform oil film. Next, an experiment was performed to investigate the effects of the oil temperature and flow rate on the oil flow. The oil film formation rate was the highest (83%) when the oil temperature was 40 °C and the flow rate was 6 LPM.

Suggested Citation

  • Taewook Ha & Dong Kyu Kim, 2021. "Study of Injection Method for Maximizing Oil-Cooling Performance of Electric Vehicle Motor with Hairpin Winding," Energies, MDPI, vol. 14(3), pages 1-15, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:747-:d:490648
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    References listed on IDEAS

    as
    1. Zabdur Rehman & Kwanjae Seong, 2018. "Three-D Numerical Thermal Analysis of Electric Motor with Cooling Jacket," Energies, MDPI, vol. 11(1), pages 1-15, January.
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    Cited by:

    1. Gaurav Kumar Pandey & Siddharth Sriram Sikha & Abhineet Thakur & Sai Sravan Yarlagadda & Sai Santosh Thatikonda & Bibin Baiju suja & Arkadiusz Mystkowski & Egidijus Dragašius & Edison Gundabattini, 2023. "Thermal Mapping and Heat Transfer Analysis of an Induction Motor of an Electric Vehicle Using Nanofluids as a Cooling Medium," Sustainability, MDPI, vol. 15(10), pages 1-18, May.
    2. Lino Di Leonardo & Giuseppe Fabri & Andrea Credo & Marco Tursini & Marco Villani, 2022. "Impact of Wire Selection on the Performance of an Induction Motor for Automotive Applications," Energies, MDPI, vol. 15(11), pages 1-19, May.

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