EPS无刷电机控制器结构设计与散热性能试验

为解决汽车电动助力转向系统大功率无刷电机控制器发热过大所致的功率MOSFET管损坏问题,结合固体结构热传导原理对控制器结构进行设计。运用有限体积法的控制器三维温度场模型,对该汽车电动助力转向系统(EPS)无刷控制器结构散热性能进行数值模拟,对控制器大电流、高温运行的情况下电路板温升进行试验测定,对比试验数据与数值计算结果,新型控制器结构设计合理,散热性能最好。数值模拟对新型EPS无刷控制器的批量生产具有重要实际意义。

Design and heat dissipation performance simulation of EPS brushless motor ECU structure

Based on heat conduction principle,the EPS（electric power steering）brushless motor ECU（electronic control units） structure was designed to eliminate the power Mosfet damage caused by overheating of EPS system’s brushless motor ECU. By using ECU 3D temperature field model of the finite volume method,the heat dissipation performance of the brushless motor ECU structure was simulated and analyzed. PCB temperature rise was measured under the condition of large current and high temperature. The comparison between test values and numerical simulation results show that the design of the new type ECU structure is reasonable and its heat dissipation performance is best. The numerical simulation has the important practical significance for mass production of new EPS brushless ECU.