关键词: 永磁同步电机, 边界条件, 等效电流, 饱和效应, 磁导网络

Abstract: High-power density surface-mounted permanent magnet synchronous motor ( SPMSM ) has been widely applied in aerospace drives, and magnetic saturation is a critical issue for this type of motor. Affected by the operating characteristics of aerospace motors, traditional analytical methods fail to accurately analyze the magnetic field distribution under overload conditions. To simplify the model, existing studies usually ignore the tooth-shoe structure, whereas the permeability at the tooth shoe varies dynamically with saturation effect, which distorts the air-gap magnetic circuit accordingly. To realize precise magnetic field prediction, this paper adopts equivalent current to consider the saturation effect,proposes improved boundary conditions suitable for saturation characteristics, and constructs a novel permeance network combined with actual magnetic circuit features, followed by iterative solution. Finite element analysis and experiments validate the effectiveness of the proposed method,which is applicable to the electromagnetic analysis of highpower-density SPMSM.

Key words: permanent magnet synchronous motor, boundary condition, equivalent current, saturation effect, permeance network