直流有刷电机电磁干扰建模及预测

Modeling and Prediction of Electromagnetic Interference for Brushed DC Motors

摘要:

直流有刷电机作为汽车摇窗中的一个重要的零部件，其产生的电磁干扰容易与其他车载电器产生电磁耦合，给汽车的安全驾驶造成一定的隐患。针对直流有刷电机电磁干扰的建模和预测问题，通过深入研究直流有刷电机换向过程和电机传导干扰系统模型以及电机绕组等效电路模型，建立电源和线路阻抗稳定网络（line impedance stabilization networks， LISN）的等效电路模型，对电机的传导干扰强度进行模型仿真预测，结果较为准确；基于电机辐射干扰测试流程，利用CST软件建立电机辐射干扰的三维模型，将三维模型与二维模型进行联合仿真，利用电流钳测试得到频域上的激励源以及CST仿真得到辐射干扰系统的传递函数，对电机的辐射干扰强度进行模型仿真预测，结果较为准确。

Abstract:

As a relatively important component in the body design， the DC brush motor can easily generate electromagnetic interference with other on-board electrical appliances， causing certain hidden dangers to the safe driving of the car. Aiming at the modeling and prediction of the electromagnetic interference of the brushed DC motor， through in-depth research on the commutation process of the brushed DC motor， the motor conduction interference system model and the equivalent circuit model of the motor winding， the power supply and LISN （Line Impedance Stabilization Networks） are established. The effective circuit model is used to simulate and predict the conducted interference intensity of the motor， and the results are more accurate； based on the test process of the motor radiated interference， the CST software is used to establish a 3D model of the radiated interference of the motor， and the 3D model and the 2D model are co-simulated， using the current The excitation source in the frequency domain is obtained from the clamp test， and the transfer function of the radiation interference system is obtained by the CST simulation， and the model simulation prediction of the radiation interference intensity of the motor is carried out， and the results are relatively accurate.