Innovative Design of the Cooling Topologies for Electric Vehicle Motors

2019 The 5th International Conference on Electrical Engineering, Control and Robotics

无线电电子学;计算机科学

Zi-Chao, Zhang^1^2 ; Qiang, Song^1 ; Ahmed, Bilal^1

School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China^1

College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China^2

关键词: Air cooling system;    Development results;    Forced air cooling;    Higher energy density;    Liquid cooling systems;    Natural air cooling;    Performance requirements;    Permanent magnets (pm);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/533/1/012021/pdf
DOI  :  10.1088/1757-899X/533/1/012021

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

According to the different cooling medium, the electric motor cooling styles can be divided into liquid cooling and air cooling; the former involves water cooling and oil cooling while the latter comprises natural air cooling and forced air cooling. Whereas, the air cooling system is difficult to meet various performance requirements for the modern Electric Vehicle (EV). Therefore, approximately all EV motors are liquid cooled at present. Moreover with the trend of EV motors to Permanent Magnet (PM) and to high speed, for instance, the maximum working rotated speed from 10,000rpm to 20,000 rpm, the packaging of the motor is minimized at same power while efficiency drops, lifetime shorten and even cause demagnetization due to thermal effects without optimum design. Consequently, the improvement of the liquid cooling system is essential to enhance the efficiency of the EV motor in the future for higher power density. In this perspective, the innovative cooling topologies of electric machines based on the development results of the parts such as lubricating oil and motive seal of electric vehicles are presented in this paper. It solves some problems brought about by predecessors in view of the high efficiency and reliability of the motor with higher energy density.