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This paper presents a design approach to an interior permanent magnetic synchronous motor (IPMSM) for the compressor of a hybrid electric vehicle operated in a 42-V battery system. The approach is to estimate the range of inductance and back-EMF to satisfy the required efficiency of IPMSM. Then, the preliminary geometry satisfying the region is decided by PM type, current density, fill factor, and so on. Last, the detailed design with optimization is performed to consider magnetic saturation and reduce cogging torque and torque ripple. At this time, the simulation results are obtained by finite element analysis and in consideration of operating temperature. In the end, the validity of the design process presented in this paper is verified by test.
Date of Publication: June 2008