Performance improvement by making holes of Interior permanent magnet synchronous motor

This paper discusses a study on interior permanent magnet synchronous motor(IPMSM) which has high power density. The focus is placed on applications where the centrifugal forces due to high-speed operation are the major mechanically limiting design factor. In order to improve efficiency performance of IPMSM, this paper presents a study by making hole around barrier. The suitable hole disperses rib stress that is concentrated by the centrifugal force. And the use of hole can be reduced rib thickness of IPM rotor and it can help reduction of the PM[Permanent Magnet] leakage flux. And saliency ratio can be also increased. For this study, structure analysis of rotor is performed by finite element method (FEM). And electromagnetic parameters of the improved IPMSM are calculated by using the equivalent circuit method (ECM) and finite element method (FEM). And characteristic analysis is performed and we confirm that efficiency is improved. This example presents that it is possible to significantly improve the rotor's structural integrity and motor efficiency using the techniques described in this paper.