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

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

doi:10.1109/ecce.2016.7855097

Cited by 9 publications

(4 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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“…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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“…In the case of a very heavy vehicle, the acceleration time may be long, and therefore, the most efficient stator winding cooling is required as detected in [4][5][6]. Some vehicles benefit from a liquid spray applied in the air gap [7] or to the end windings [8].…”

Section: Introductionmentioning

confidence: 99%

Direct Liquid Cooling Method Verified With a Permanent-Magnet Traction Motor in a Bus

Lindh

Petrov

Pyrhonen

et al. 2019

IEEE Trans. on Ind. Applicat.

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Direct liquid cooling (DLC) of electrical machine windings is a clearly effectual cooling method for high-torque and high-power-density applications needed, especially, in heavy vehicles. Usually, in electric vehicles, the stator copper winding losses are the most dominating losses during the accelerating or decelerating (recuperation) modes, and therefore, traditional windings may heat up significantly during high-torque periods. Removing the heat directly from the winding in which most of the heat is generated, allows the most straightforward and effective way of cooling. This paper investigates the feasibility of the direct liquid cooling in a radial-flux permanent-magnet traction motor. This case provides experimental information of the behavior of the direct liquid cooling of the windings. The prototype motor equipped with directly liquid-cooled windings is installed in an electric bus so that typical bus load cycles can be tested.

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

Cited by 9 publications

References 5 publications

Traction Motor Cooling Systems: A Literature Review and Comparative Study

Traction Motor Cooling Systems: A Literature Review and Comparative Study

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

Direct Liquid Cooling Method Verified With a Permanent-Magnet Traction Motor in a Bus

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