An Investigation on the Cooling System of Synchronous Motor for Electric Buses

Abstract

Due to the increase of the electric vehicle market, the mileage of the electric vehicle with full batterygets importance. The ambient temperature or the abuse driving conditions directly affects the mileageof the electric vehicle. To increase the mileage, the analysis of the thermal management system of theelectric vehicle should be studied well. Besides the battery, one of the most important components ofan electric vehicle is the synchronous motor. Thus, this study focused on the cooling methodology ofpermanent magnet synchronous motor which is limited in the literature. The cooling methodology ofthe synchronous motor directly affects battery performance. To analyze the thermal managementsystem of an electric vehicle, analyzing the synchronous motor cooling water circulation methodologyis taken into account and numerical simulations are validated by experimental results with 0.2%error. The effect of the mass flow rate of the motor coolant on the pressure drop is also analyzed.