Temperature Profiles Field Of Auto Starter Based On FEM

With gradually exhaustion of petroleum and progressive depravation of environmental quality, the start-stop system has been gradually considered and applied as a practical technology to reduce vehicle emission, while the system also performs extremely well during the bad traffic. Motor of automotive starter, as an important component in starter, is one of the key parts of start-stop system. The increasing frequency of use requires more higher demand of this system and it’s parts. Especially the thermal load is a sensitive factor of system durability.This article builds on a DC motor, and analyzes the magnetic field of the motor by two-dimensional FEM method. After the value and distribution of starter iron loss obtained, two-dimensional temperature gradient was provided in the remainder of this article. Firstly, electromagnetic field calculated by commercial software Maxwell under the rated condition, and obtained the relationship of current with loss of DC motor. Secondly, the loss of DC motor has input in two-dimensional FEM model as heats, while temperature field being analyzed by a joint simulation method of Maxwell and Fluent. In order to reduce computational complexity, the three-dimensional motor structure simplified as two-dimensional FEM model. The complex working condition is severely affecting the temperature distribution when analyzed under cycle operating condition, so steady working condition as a stricter condition has been applied in the analysis. All the temperature field provided by Fluent. The highest temperature is 121℃ at the field winding, the minimum temperature is 52℃ in frame surface. Comparison of repressed products and simulation results show that the simulation is correct. The most sensitive part among starter motor is field winding. It proves the simulation conclusion of starter’s temperature field distribution. Finaly, Some suggestions on manufacturing process and motor designing has been put forward.