Research on Vibration and Acoustic Noise Emission of Nanocrystalline Inductors Based on Multi-physics Coupling Analysis

Inductors are the most widely used components in power converters, and their vibration and acoustic noise are problems that cannot be ignored for the system's stable operation. To figure out the vibration and noise performance of nanocrystalline inductors, the coupled finite element model of the electromagnetic-mechanical field is established and the effects of Maxwell force and magnetostriction on magnetic core deformation are compared. The vibration and noise of cut and uncut nanocrystalline inductors are tested under different excitation conditions. The results show that the vibration and noise of the cut core under square wave excitation are stronger. The vibration spectrum of both cut and uncut cores is mainly distributed on the even times of the excitation frequency. The research in this paper can provide a basis for optimizing the vibration and noise of inductors.