1. June 2015 19:10 by Christian in
EV components responsible for electromagnetic emissions are the electric motor, the power converter, the power supply, and the lines/cables connecting them. The high speed switching device part of the power converter is the main source of EMI. The impedance of the electric motor that varies as a function of frequency is also an important factor in EMI analysis. Another EMI contributor is the behavior within the high frequency range of the traction battery providing power to the converter. The high-voltage bus (e.g. 900 V) connecting the power converter with the motor and the power supply must be kept very short to limit the emission of noise. The high-voltage system must be insulated and does not use the car body as return conductor like the low-voltage supply system does. The crosstalk between the different lines and the EMI radiated from the high-voltage cables into EV must be addressed.