Simple nonlinear magnetic analysis for permanent magnet motors

This paper presents a simple nonlinear magnetic analysis for surface-mounted permanent magnet synchronous motor (SPMSM) as an assistant design tool of FEA. The equivalent magnetic circuit of the motor used in the proposed analysis is composed of the saturable permenance tips in the stator teeth for considering the local magnetic saturation. As a result, the proposed analysis is capable of calculating the flux distribution and the torque characteristics in the presence of magnetic saturation. The effectiveness of the proposed analysis is verified by comparing with 3D-FEA in terms of the analytical accuracy. The computation time is greatly reduced as short as 8 seconds while the 3D-FEA requires as much as 32 minutes for the same evaluation.