Portal de Periódicos da CAPES

Thermal management characteristics of electric vehicle driving motor with oil spray cooling based on spray locations and oil types

2024; Elsevier BV; Volume: 248; Linguagem: Inglês

10.1016/j.applthermaleng.2024.123234

1873-5606

Kunal Sandip Garud, Moo‐Yeon Lee,

Heat Transfer and Optimization

The thermal management of electric motors as an integral core part of electric vehicles needs to be addressed with the next generation cooling strategy to achieve the high-power density and thus to reach the standards of IC engine vehicles. In the present work, thermal management characteristics are investigated for electric driving motor with various oil spray cooling configurations. A novel multi-nozzles based oil spray cooling is proposed to improve the thermal management of commercial electric driving motor. A coupled numerical analysis is conducted to simulate the thermal management characteristics including electromagnetic losses, temperatures of electric driving motor components, torque, power output and efficiency. The experiments are conducted to validate the thermal management characteristics within maximum error of 5.62 % for electric driving motor with proposed oil spray cooling. The multi-nozzles based oil spray cooling is considered with different nozzle locations (outer spray cooling, front and rear spray cooling, combined spray cooling), different cooling oil types (ATF oil, shell oil, Novec oil), different oil flow rates (6 LPM, 10 LPM, 15 LPM) and different oil inlet temperatures (20 °C, 40 °C, 60 °C) to evaluate various thermal management characteristics. The thermal management characteristics of electric driving motor are superior for combined spray cooling with ATF oil compared to water jacket cooling and other ATF oil based spray cooling configurations. And thermal management characteristics are further improved for combined spray cooling by replacing ATF oil with shell oil and Novec oil. The combined spray cooling with Novec oil is suggested as the best cooling configuration that shows windings temperature of 128.9 °C and torque of 255.59 N.m. The superior values of thermal management characteristics with lowest windings temperature of 113.7 °C, maximum torque of 266.72 N.m, and maximum efficiency of 96.84 % are achieved for the best cooling configuration at higher oil flow rate and lower oil inlet temperature.