Modeling and Analysis of the Flux-Weakening Range of Interior Permanent Magnet Synchronous Machines with Segmented Permanent Magnets

To improve the flux-weakening characteristics, Interior Permanent Magnet Synchronous Machines with Segmented Permanent Magnets (Segmented IPMSM) are investigated in this paper. At first, an improved magnetic circuit analysis model is deduced to explain the flux-weakening mechanism of Segmented IPMSM. Then, four different rotor topologies are obtained through designing the number of segmented permanent magnets and the shape and placement of the segmented permanent magnets in rotor. The detailed comparisons of characteristics such as d-axis inductance and flux-weakening speed-expansion are presented by Finite Element Method. The results illustrate flux-weakening capability is improved by magnet segmentation with iron bridges.