Abstract
It is important for home appliances to reduce their noise. Many motors are used in these appliances and their vibration sometimes cause noise. In this paper, we investigate the noise of the exhaust fan and reduce it. When the electromagnetic exciting force and the mechanical system vibrate sympathetically, vibration and noise level rise. In order to lower their level, we investigated the characteristic of the electromagnetic exciting force of the motor and vibrational mode of the mechanical system. As a result, we modified the shape of the fan slightly and achieved 10dB of noise reduction.
