Estimation of Oil Spray Cooling Heat Transfer Coefficients on Hairpin Windings With Reduced-Parameter Models

Liu, Chuan; Gerada, David; Xu, Zeyuan; Chong, Yew Chuan; Michon, Melanie; Goss, James; Li, Jing; Gerada, Chris; Zhang, He

doi:10.1109/tte.2020.3031373

Cited by 34 publications

(7 citation statements)

References 25 publications

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“…This LPTN had been validated through experimental investigations and can be used as a good reference for electrical machine researchers to investigate the thermal performance of such windings. The estimation of heat transfer coefficient of oil spray cooling system was investigated in [45], which was based on reduced-parameter models that can be easily used by other electrical machines.…”

Section: Direct Oil Coolingmentioning

confidence: 99%

Advances in Thermal Management Technologies of Electrical Machines

Wang

Wu²,

Niu

et al. 2022

Energies

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Given the fact that the operation of electrical machines generates various loss components that finally become heat, developing advanced thermal management technologies is essential to control temperature increases and to guarantee safe operations. Meanwhile, the armature winding can stand larger currents when the machines are equipped with advanced cooling systems, which directly improves torque/power densities. This paper aims to provide a systematic review of the latest developments of advanced thermal management technologies of electrical machines. According to different heat dissipation mechanisms, the cooling systems studied in this paper are categorized into five major types: enclosed housing cooling, enhanced conductive cooling, embedded heat pipe cooling, direct oil cooling, and enhanced rotor cooling. The advantages and disadvantages of these cooling systems are researched and compared comprehensively. This study contributes to the revelation of insights on the thermal management of electrical machines and offers good guidance for the thermal management of electrical machines.

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Section: Direct Oil Coolingmentioning

confidence: 99%

Advances in Thermal Management Technologies of Electrical Machines

Wang

Wu²,

Niu

et al. 2022

Energies

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“…Liu et al in [11], [33] provided the latest and comprehensive study about oil spray cooling systems. They implemented this cooling system on the motor with a hairpin winding configuration.…”

Section: Ac Copper Lossesmentioning

confidence: 99%

Additive Manufacturing of Prototype Axial Flux Switched Reluctance Electrical Machine

Tiismus

Kallaste

Vaimann

et al. 2021

2021 28th International Workshop on Electric Drives: Improving Reliability of Electric Drives (IWED)

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This paper presents a survey about implementing hairpin winding with an oil spray cooling system on the new generation of electrical vehicle (EV) motors as an option to produce high power density, high efficiency, costeffectiveness, lightweight, reliable EV motors. It provides the advantages and drawbacks of this rectangular winding compared to random winding and considers the hairpin winding production aspects. According to the high AC losses of this configuration, the paper considers two conventional approaches for calculating these losses with their advantages and drawback. Then it proposes the novel hybrid FEA method for calculating the AC copper losses to overcome the weaknesses of analytical and numerical methods. Finally, it provides a holistic view related to the oil spray cooling of the electrical machine and points the future work associated with this cooling method

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“…The mass force is ignored, and there is no pressure difference in the axial direction. (3) The fluid flow at the end of the cylinder is assumed to be a steady flow, the velocity does not change with θ, and the mass force is ignored. (2) The fluid motion in the air gap is considered as circular steady lamin axial and radial velocities are approximately 0.…”

Section: An Improved Analytical Derivationmentioning

confidence: 99%

“…An in-wheel motor is the development trend of electric vehicles, towards the trend of high power, large torque, and small volume [1][2][3]. However, the serious heating problem caused by the increase of power density is bound to bring the risk of temperature rise of the motor beyond the safe operation range.…”

Section: Introductionmentioning

confidence: 99%

Oil Friction Loss Evaluation of Oil-Immersed Cooling In-Wheel Motor Based on Improved Analytical Method and VOF Model

Yin

Xiang

2021

WEVJ

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Oil-immersed cooling provides an effective cooling scheme for high-power hub motors with compact structure and serious heating problems. However, with this cooling method, some oil friction loss will be generated, making the output torque and efficiency of the motor lower, which limits its application in the motor. It is essential to get an exact calculation of the oil friction loss so that it can be reduced in the future research. Firstly, a new method was proposed to improve the accuracy of oil friction loss calculated by an existing analytical method (Kori’s method), while the influence laws of oil-soaked depth and rotation speed on it were explored. Secondly, a three-dimensional transient Computational Fluid Dynamic (CFD) model based on Volume of Fluid (VOF) was established, considering the actual complex structure and the disorderly mixing of oil and air inside the motor. Finally, the oil friction loss calculated with an improved analytical method and a VOF model was verified by a testing. It was indicated that the VOF model was more precise but more time-consuming. The proposed method has the second highest accuracy but takes less time.

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Estimation of Oil Spray Cooling Heat Transfer Coefficients on Hairpin Windings With Reduced-Parameter Models

Cited by 34 publications

References 25 publications

Advances in Thermal Management Technologies of Electrical Machines

Advances in Thermal Management Technologies of Electrical Machines

Additive Manufacturing of Prototype Axial Flux Switched Reluctance Electrical Machine

Oil Friction Loss Evaluation of Oil-Immersed Cooling In-Wheel Motor Based on Improved Analytical Method and VOF Model

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