3-Phase Pseudo-Random Carrier Modulation Technique for the Acoustic Noise Reduction of the 3-Phase Multi-Level Inverter Based Motor

3상 멀티 레벨 인버터 구동 유도 전동기의 소음저감을 위한 3상 준 랜덤 캐리어 변조기법

This paper describes a simple pseudo-random carrier modulation technique for the acoustic noise reduction of the three phase multi-level inverter based motor drives. The proposed method generates a new pseudo-random carrier by randomly synthesizing a carrier with fixed frequency and a carrier with opposition phase. To confirm the validity of the proposed method, a 130v three-phase multi-level inverter was Implemented and tested. The experimental results show that the output line voltage and acoustic noise harmonics spectra of an inverter have broadening effect of harmonics, as only simple synthesis of fixed frequency carries.