Magnetic Field Prediction in Surface-Mounted PM Machines with Parallel Slot Based on a Nonlinear Subdomain and Magnetic Circuit Hybrid Model

This paper proposes a nonlinear subdomain and magnetic circuit hybrid model (SMCHM) for surface-mounted permanent magnet (SPM) machines with parallel slot. The nonlinearity effect of stator is solved by introducing equivalent current sheets in the slot. The coupling position of this hybrid model is on the stator bore, and the magnetic field distributions in slots are calculated by magnetic circuit of SMCHM instead of subdomain model to reduce the error caused by approximation from sectorial slot to parallel slot. The accuracy of SMCHM for electromagnetic performance prediction is validated by finite element (FE) method.