Methods for the Viscous Loss Calculation and Thermal Analysis of Oil-Filled Motors: A Review

Jian Zhang, Yinxun Shao, Yinxin Long, Xiangning He, Kangwen Wu, Lingfeng Cai, Jianwei Wu () and Youtong Fang
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Jian Zhang: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Yinxun Shao: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Yinxin Long: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Xiangning He: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Kangwen Wu: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Lingfeng Cai: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Jianwei Wu: School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
Youtong Fang: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Energies, 2024, vol. 17, issue 18, 1-21

Abstract: Oil-filled motors (OFMs) are widely used in deep-sea exploration and oil well extraction. During motor operation, the rotor stirs the oil in the air gap, causing viscous loss. Viscous loss affects the temperature distribution inside the motor. Accurately calculating the viscous loss and temperature rise in OFMs can provide a basis for optimizing the motor’s structural design. Motor structural parameters, including the rotor’s outer diameter, air gap, and slot opening, have a significant impact on viscous loss. The working conditions of OFMs, such as rotor speed and environmental temperature, also affect viscous loss. The viscosity of hydraulic oil is highly influenced by temperature, and changes in viscosity can lead to changes in viscous loss. These changes in viscous loss, in turn, alter the temperature distribution. Therefore, the coupling relationship between viscous loss and temperature must be considered. Additionally, when Taylor vortices occur in the fluid, the surface roughness of the rotor also has a significant influence on viscous loss. Currently, both domestic and international research on viscous loss and thermal analysis struggle to simultaneously consider the coupling of viscous loss and the temperature field, rotor surface roughness, and the effect of motor structure. This paper summarizes the methods used in recent years for studying viscous loss and thermal analysis, and puts forward some suggestions for future research on the coupling of the OFM temperature field and viscous loss.

Keywords: oil-filled motors; viscous loss; computational fluid dynamics (CFD) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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