Abstract
Mitsubishi Electric Corporation developed a compressor equipped with a concentrated winding motor that adopted a press-fitted segment core 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 a calculated natural frequency of (2, 2) mode was matched to the measured natural frequency based on the theoretical formula of the natural frequency of the ring to presume the equivalent stiffness coefficient needed for the vibration analysis. Afterwards, the noise analysis of the structure-changing model 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 equipped with a concentrated winding motor that adopted the press-fitted segment core could be predicted.
