A Study on the Electrical Magnetic Excitation Force and Noise Characteristics in Motor of Interior Permanent magnetic Type

영구자석 매입형 BLDC 모터의 전자기적 가진력 및 소음특성에 관한 연구

The frequencies of principal noise in interior permanent motor originate form two sources. One is torque ripple that is composed of cogging torque, magnetic torque ripple and reluctance torque ripple. The other is induced by natural frequencies. In this paper, the torque ripple and its influence on noise was examined by theoretical analysis. Understanding relation of dynamic characteristics and noise, natural frequencies and mode shapes were obtained by experimentation and operational deflection shape was observed. Finally, the method of predicting frequencies of principal noise was proposed.