Abstract
The objective of this study is to examine the vibration and noise characteristics of a four-pole induction motor regarding the number of rotor slots. There are thirty six stator slots in the reference model, and its results are theoretically verified in case of a twenty-four-slot stator. Radial force density is obtained from two magnetic flux densities in the radial and tangential direction, and vibration performance is comparatively evaluated in terms of a rotor slot number by dividing radial force density into its temporal and spatial components through Fast Fourier Transform (FFT). Noise as the definition of sound pressure level is estimated in the units of decibels, and the noise of each motor is correlated with its vibration acceleration regarding temporal and/or spatial harmonic orders. In conclusion, the combination of stator and rotor slot numbers is critical since the 2nd orders lead to the deterioration of vibration and/or noise. As a result, the existence of the 2nd orders has to be carefully checked in advance by using several equations before the determination of physical dimensions in an induction motor in detail. In this paper, those equations have been given, and the comparison of vibration and noise in terms of a slot combination has been detailed in the step-by-step manner.
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