High-frequency Modeling of a BLDC Motor for Radiated Emission Prediction

This paper presents a high-frequency modeling for a stator winding of a BLDC motor as a means of predicting the relative RE noise feature through simulation. Noting that the high-frequency signal flow in a three-phase electric motor can be expressed through a T-network modeling and the radiation feature can be estimated by antenna impedances, we carry out full-wave EM simulations on the stator winding. The proposed high-frequency modeling technique is used to predict the change in radiated electric field according to the motor housing structures. It is verified by the manufactured prototype and measurement that the relative change in RE value can be predicted.