Modeling and Prediction of Electromagnetic Interference for Brushed DC Motors

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.