Software Based Analysis of Electromagnetic Noise Reduction of a High-Speed BLDC Motor Drive

Due to leakage current injection to the system ground and high frequency components in DC link resulted from High-speed BLDC motors performance, there are interference with the other equipment performance. Hence it is necessary to overcome electromagnetic interference. In this paper, high-frequency model of BLDC motor is extracted using finite element analysis in the MAXWELL software based on some new solutions. The parameters of high frequency simple model of power switch are valuated using the switch datasheet. A method that uses the filtering method and snubber circuits is proposed to reduce the generated noise. We calculate the frequency spectrum of the DC link current and the leakage current from motor to ground network. The proposed method is effectively capable to reduce the amplitude of the leakage current and weaken considerably the high frequency components of DC link current.