Investigation of electromagnetic noise in an induction cooktop by examining circular membrane vibration modes in terms of their harmonics

In this study, the mechanism of vibration and noise is analytically investigated in an induction cooktop (IC). By employing the method of an electric motor in estimating its vibration performance, it is found that air-gap force normal to the glass surface is a main source in an IC. Three different types of a cookware in terms of its material are compared as a part of load, and the pattern of their vibration is scrutinized by means of a membrane. It is noted that the mode of vibration in an IC is the circular shape of a membrane. Spatial and temporal harmonics in normal force are obtained through a three-dimensional Fast Fourier transform. This study is focused on spatial harmonic orders in a cylindrical coordinate to determine the dominant mode of vibration, and experimental verification has been performed to prove the feasibility of this proposal.