Common Mode Current Estimation for Filter Design for Non-Ideal Back EMF of a PMSM

This paper describes different modeling steps to estimate Common Mode (CM) currents with a Permanent Magnet Synchronous Machine (PMSM) as load, dependent on the cable constellation and cable length. Which is load with a non-ideal load inducing a non-Ideal Back Electromagnetic Force (EMF). The effects of these 3 different parameters on the CM current have been simulated. It can be observed that the cable length and constellation have an impact on the emissions of the CM current. If a symmetrical Back EMF is applied, it does not contribute to CM emissions, which should be considered in the design of the Electromagnetic Interference (EMI) filter.