Abstract
Calculating noise with a high degree of accuracy is necessary for estimating the radiated noise induced by the electromagnetic force from a motor. The accuracy of the calculation can be improved by modeling the motor in detail, but that increases the number of degrees of freedom in the model and has limitations due to increased CPU time. We analyzed models that give accurate of electro-magnetic noise in the range of the frequency band where the noise occurs. We compared the calculations based on stator core models with and without teeth ; the number of degrees of freedom in the model without teeth was less than that in the one with teeth. We found that the calculation based on the model without teeth was as accurate as the one based on the model with teeth. Moreover, we confirmed that, of the radial and circumferential electro-magnetic forces, the radial electro-magnetic force was the dominant source of electromagnetic noise.
