Modeling and simulation of the conducted electromagnetic interference for permanent magnet direct current motors

A simulation model for evaluation of conducted electromagnetic interference(EMI) is developed based on analysis of the mechanism giving rise to conducted EMI.The simulation model includes high frequency effects associated with stray distributed parameters.The current commutation in armature coils is identified as the main cause of conducted EMI.Based on analysis of current commutation,the voltage of conducted EMI is calculated and an equivalent lumped parameter network is presented to replace the effects of the distributed parameters.The conducted EMI of a permanent magnet DC motor is simulated using OrCAD/PSpice package and the validity of the model was verified.