Abstract: The AC motor has the advantages of simple structure, high reliability and low cost, and is widely used in the range hood products. However, due to the inherent properties of the AC motor, many range hood products equipped with the AC motor appear 100 Hz and 200 Hz motor resonance “buzz”, which will seriously affect the customer experience and reduce product quality. Through the combination of dichotomy and spectrum analysis, rapid qualitative and quantitative analysis of the abnormal sound, through the combination of motor shock pad matching and sheet metal structure optimization, effectively eliminate the kitchen hood motor sound.

Key words: AC motor, Spectrum analysis, Shock pad matching, Sheet metal structure optimization