Experimental research on the oil cooling of the end winding of the motor

Li, Ye; Fan, Tie; Sun, Wei; Qi, Li; Xu, Wen

doi:10.1109/ecce.2016.7855097

Cited by 11 publications

(5 citation statements)

References 5 publications

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“…The calculation of the heat transfer for the oil emerging axially from the stator cooling channels can be found in Table 21. Some authors investigated the direct cooling of the axial stator yoke and windings head by flooding the corresponding motor region with an oil sleeve [139][140][141]. Another possible cooling arrangement is the direct cooling of the stator back iron by oil flushing (SOF) (m & n).…”

Section: F Direct Stator Liquid Coolingmentioning

confidence: 99%

Traction Motor Cooling Systems: A Literature Review and Comparative Study

Gronwald

Kern

2021

IEEE Trans. Transp. Electrific.

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More efficient cooling systems are an enabler for the increase in power-density in an electric traction motor. Contemplating to existing reviews, this paper presents a comprehensive collection of heat transfer mechanisms for the different heat removal techniques used in electric traction motors. In the first section, an overview of various cooling concepts in existing and future traction motors is presented and the cooling approaches are compared. The following literature review compiles geometry-based calculation formulas of the different mechanisms of cooling heat transfer applied in motor-technology. Furthermore general heat transfer phenomena appearing in electric traction motors are reviewed and compiled for easy access. Various specifically relevant aspects, including rotor shaft cooling, different spray cooling concepts, different air convection phenomena, bearing heat transfer and the stator-housing-contact, are examined in more detail. For validation of the review result, based on a well-known motor design a thermal analysis and comparison of the different cooling methods is carried out. Modeling is done with a lumped parameter thermal networks (LPTN). The paper concludes demonstrating the advantages and disadvantages of the different cooling concepts based on the collection of modeling data.

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Section: F Direct Stator Liquid Coolingmentioning

confidence: 99%

Traction Motor Cooling Systems: A Literature Review and Comparative Study

Gronwald

Kern

2021

IEEE Trans. Transp. Electrific.

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“…But, the speed of cooling oil is very high when it reaches the winding, which will impact the winding and lead to winding deformation. Ye et al 2 designed a glass fiber sleeve to isolate the motor stator and rotor. They also immersed the end winding into oil to strengthen cooling.…”

Section: Introductionmentioning

confidence: 99%

Design of an oil-cooling-system of new energy vehicle drive motor

Wan

Dong

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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A direct contact oil-cooling-system is designed for enhancing motor heat dissipation and integrating motor cooling system and gearbox cooling system. Considering the high viscous resistance of oil, a new S-shaped channel is proposed. The pressure loss along the S-shaped channel is only half of that of the axis-oriented channel with right turn angle and is 33% less than that of the axis-oriented channel with fillet. The structure parameters of the S-shaped channel and the layout of the oil spray nozzles are optimized by finite element method. The optimized turn number, channel width and nozzle number of are 16, 18 mm, and 19 respectively. The highest temperature of the motor is 92.6 °C and the highest temperature of the end winding is 1.5 °C higher than that of the stator core. Therefore, lower flow resistance and better temperature uniformity in the motor with the direct contact oil-cooling-system is realized.

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“…Therefore, the oil-cooling method with high cooling performance is necessary for cooling EV motors. Oil cooling is a method of cooling a motor by directly spraying oil onto a heat source inside the motor [15,16]. Huang et al [17] compared indirect and direct oil-cooling methods.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Behavior of Coolants, Particularly the Oil-Cooling Method, in Electric Vehicle Motors Using Hairpin Winding

Han

Kim

et al. 2021

Energies

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This paper analyzes the characteristics of oil behavior in the oil-cooling of motors with hairpin winding to understand how to maximize cooling performance. The oil cooling is performed by directly spraying oil onto the motor components. The results show that as the temperature of the oil increases, the viscosity decreases, and the oil film is formed more evenly; however, oil splashing also increases. Similarly, as the flow rate increases, oil splashing also increases, but the amount of oil forming the oil film increases. However, the oil film is not affected by the rotor’s rotation. In contrast, the immersed oil is found to be closely related to the rotor’s rotation. As the rotational speed increases, the immersion oil is mixed with the air, and oil churning occurs. The mixing phenomenon increases as the temperature and flow rate of the oil increases. The higher the oil level, the greater the oil churning. As the oil is mixed with air, the heat transfer coefficient decreases, which adversely affects the thermal management of the motor. As a result, when considering the oil film and the immersion oil, the optimal oil temperature, flow rate, and oil level are at 60 °C, 0.140 kg/s, and 85 mm, respectively. The results of this paper give important information about EV motor cooling and can contribute to the development of high-performance motors.

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Experimental research on the oil cooling of the end winding of the motor

Cited by 11 publications

References 5 publications

Traction Motor Cooling Systems: A Literature Review and Comparative Study

Traction Motor Cooling Systems: A Literature Review and Comparative Study

Design of an oil-cooling-system of new energy vehicle drive motor

Experimental Study on Behavior of Coolants, Particularly the Oil-Cooling Method, in Electric Vehicle Motors Using Hairpin Winding

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