Characterizations of PM Synchronous Motor With an Integrated Common-Mode Voltage Filter

The high-frequency common-mode voltage generated by switching of semiconductor devices may cause premature failure of the insulation system and metallic bearings in the motor drive systems, the false trigger of the relay devices, and electromagnetic interference. In this article, an integrated filter is proposed to reduce the common-mode voltage in the permanent magnet synchronous motor. In this filter, partial motor windings, which serve as inductance, are integrated with the passive components. Compared to the system with a conventional passive filter, the omitted filtering inductor of this integrated common-mode voltage filter reduces the weight and volume of the whole motor drive system. The peak-to-peak value and the high-order harmonic components of common-mode voltage can be reduced to up to 10% and 2% of those in motor without the integrated filter, respectively. Additionally, the root mean square value of the common-mode voltage has been reduced by 27%. The benefits of the integrated filter in suppressing common-mode voltage have been validated in both simulation results and experimental data.