Noise and Vibration Analysis of Compressor for Air-Conditioning Machine Equipped with a Concentrated Winding Motor with a Press-Fitted Segment Core

The compressor which has a concentrated winding motor with the press-fitted segment core was developed for the first time domestically. It was necessary to grasp the dynamic characteristics of the press-fitted segment core to establish the low noise design technique of the developed compressor. This paper proposes a method that matches a calculated natural frequency of (2, 2) mode to the measured natural frequency based on the theoretical formula of the natural frequency of the ring, and presumes the equivalent stiffness coefficient needed for the vibration analysis. Using the method, it was clarified that the equivalent stiffness coefficient of press-fitted segment core changed from 206GPa to 165GPa by shrink-fit. Afterwards, the noise analysis of the remodeled compressor was carried out by using the equivalent stiffness coefficient. The calculated results agree well with the measured results. Therefore, it was clarified that the noise characteristics of a compressor which has a concentrated winding motor with the press-fitted segment core could be predicted.