Characteristic Analysis and Comparison of IPMSM for HEV According to Pole and Slot Combination

Interior permanent magnet synchronous motor (IPMSM) is usually applied to traction motor in the hybrid electric vehicle (HEV). All motors including IPMSM have different parameters and characteristics with various combinations of the number of poles and slots. The proper combination can improve characteristics of traction system ultimately. This paper deals with analysis of the characteristics of IPMSM for mild type HEV according to the combinations of number of poles and slots. The specific models with 16-pole/18-slot, 16-pole/24-slot and 12-pole/18-slot combinations are introduced. And the advantages and disadvantages of these three models are compared. The characteristics of each model are computed in d-q axis equivalent circuit analysis and finite element analysis. After then, the proper combination of the number of poles and slots for HEV traction motor is presented after comparing these three models.