PM Synchronous Motor with an Integrated Common-Mode Voltage Filter Considering Parasitic Capacitance Distribution

The common-mode voltage (CMV) arises from the simultaneous imbalance in the three-phase voltage output of the inverter. It is coupled with parasitic capacitance within the machine structure, which is related to the physical structure of the machine. This phenomenon induces leakage current and bearing current, potentially leading to motor system damage. Therefore, this paper proposes five different topologies of a motor with an integrated filter using partial motor windings to mitigate CMV, leakage current, and bearing current. Furthermore, considering the physical distribution of parasitic capacitance for minimizing CMV-related harms, an optimal topology with an integrated filter has been determined.