Common-Mode Voltage-Reduction Method of 7-Phase BLDC Motor Control System

Yung-Deug Son, Dong-Youn Kim, Hyeong-Jin Kim and Jang-Mok Kim ()
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Yung-Deug Son: Department of Mechanical Facility Control Engineering, Korea University of Technology and Education, Cheonan 31253, Republic of Korea
Dong-Youn Kim: Department of Research and Development, Hyowon Powertech Company, Busan 46241, Republic of Korea
Hyeong-Jin Kim: Air Mobility Electric-Motor & Drive Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Republic of Korea
Jang-Mok Kim: Department of Electrical and Electronics Engineering, Pusan National University, Busan 46241, Republic of Korea

Energies, 2023, vol. 16, issue 5, 1-20

Abstract: This paper describes a method for reducing the common-mode voltage in a seven-phase brushless DC motor (BLDC) drive. The conventional interleaved method used in the three-phase inverter system is extended and applied. The proposed phase-phase interleaved method is studied to apply the six-phase excitation method for controlling the seven-phase BLDC. The six-phase switching functions related with modulation index (MI) and interleaved angle are obtained, and the average of the common-mode voltage is derived mathematically. The proposed control method reduces the common-mode voltage generation by applying the optimal interleaved angle according to MI. The proposed method is verified by experimental results.

Keywords: BLDC motor; common-mode voltage; conducted EMI; interleaving PWM; seven-phase motor; switching frequency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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