Performance of a Direct-Liquid-Cooled Motor in an Electric Bus Under Different Load Cycles

IEEE Access

Eero Scherman¹  Juha Pyrhonen²  Ilya Petrov²  Pia Lindh²  Paula Immonen²  Markku Niemela²  Joel Anttila³  Marko Paakkinen³ 

[1] Department of Mechanical Engineering, Saimaa University of Applied Science, Lappeenranta, Finland;School of Energy Systems, LUT University, Lappeenranta, Finland;VTT Technical Research Centre of Finland, Espoo, Finland;

关键词: Electric machines;    permanent magnet motors;    rotating machines;    traction motors;    direct liquid cooling;   

DOI  :  10.1109/ACCESS.2019.2925711

来源: DOAJ

【 摘 要 】

In this paper, a direct liquid cooling method is proposed for a radial-flux permanent-magnet motor. To demonstrate the feasibility of the cooling method, a test motor with a rated output of 205 kW was designed, constructed, and tested in an actual vehicle application, an electric city bus. The energy consumption tests were conducted by applying a heavy-duty chassis dynamometer capable of simulating the inertia, weight, and road loads that the buses are subjected to in the normal on-road operation. The electricity consumption on the real bus route of the Espoo line 11 in Finland was 0.61 kWh/km. The test results of the cooling solution show that the motor is capable of meeting the most challenging requirements of the load cycle even with a full payload. The highest winding temperature rise in the test driving cycles was only 26 °C, which proves the effectiveness of direct-liquid-cooled coils in a vehicle motor.

【 授权许可】

Unknown