Design of Multi-layer IPMSM using Ferrite PM Considering Mechanical and Electrical Characteristics

This paper proposes the design method of the multi-layer IPMSM using ferrite PM considering mechanical and electrical characteristics. The various design methods of the multi-layer IPMSM have been presented, but the irreversible demagnetization is not considered during the design of the motor. In this paper, the multi-layer IPMSM is designed considering the irreversible demagnetization during the design. Because the occurrence of the local irreversible demagnetization can be confirmed by finite element analysis (FEA), the design of the motor proceeds using the FEA. The PM shape, the ratio of the PM thickness and core thickness, the number of PM layers, the pole-angle, the number of bridges, and the thickness of bridges are determined considering the mechanical and electrical characteristics. Improved design to expand the satisfactory area of the target power and reduce the irreversible demagnetization is performed.