Abstract
In view of the narrow installation space of high power density and high torque in-wheel motor, the heat existed the in-wheel motor is balanced by cooling water channel to ensure the heat dissipation of the high power density in-wheel motor. In this paper, Ansoft Maxwell software is used to establish the two-dimensional loss simulation model of in-wheel motor, and the winding loss, stator core loss, rotor core loss and permanent magnet eddy current loss of in-wheel motor are calculated respectively. The temperature field calculation model of in-wheel motor is established. The heat exchange coefficient of motor is calculated, and the equivalent treatment of windings is carried out. The spiral channel is selected to cool the motor. The CFD software is used to simulate and analyze the cooling fluid in the channel. The heat dissipation coefficient curve is calculated. Finally, the calculated results of in-wheel motor loss and heat dissipation coefficient curve are imported into the transient temperature field for simulation, and the temperature field distributions before cooling and after cooling are obtained. The results show that the temperature drop of winding is 32%, the temperature drop of stator core is 30%, the temperature drop of permanent magnet is 26%, and the temperature drop of rotor is 25%. The spiral channel structure adopted in this paper is reasonable and feasible, which provides a certain theoretical reference value for the research and development of in-wheel motor heat dissipation system.
Highlights
Facing the severe challenge of global energy crisis and environmental change, electric vehicle has become a hot spot [1] of automobile industry development in many countries in the world in recent years
As the core component of electric vehicle, the performance of in-wheel is very important and directly affects the comprehensive performance of electric vehicle driven by in-wheel motor
Electric vehicles driven by in-wheel motors usually use high-power permanent magnet motors, which are installed in enclosed narrow space
Summary
Facing the severe challenge of global energy crisis and environmental change, electric vehicle has become a hot spot [1] of automobile industry development in many countries in the world in recent years. It is very necessary to calculate the heat loss, analyze the temperature field of in-wheel motor, and conduct cooling analysis. Q. Chen et al.: Analysis of Temperature Field and Water Cooling of Outer Rotor In-Wheel Motor for Electric Vehicle. According to the structure of outer rotor in-wheel motor, the model of inwheel motor with oil cooling mode was established, and the temperature field of each component of in-wheel motor under different cooling modes was calculated and obtained. Q. Chen et al.: Analysis of Temperature Field and Water Cooling of Outer Rotor In-Wheel Motor for Electric Vehicle TABLE 2.
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