A Novel Multistructure Equivalent Magnetic Network Model for PMSM With Enhanced Magnetic Field Analysis and Saturation Compensation

This article establishes an ameliorated equivalent magnetic network (AEMN) model for the modeling and analysis of the permanent magnet synchronous motor used in compressors. A novel air-gap network model with multi-structure grids inlay (equilateral triangles and hexagons) is introduced to capture irregular flux paths. At the same time, for the magnetic flux leakage of the notch, an eight-pointed star-shaped center-radiation grid structure with a mixture of orthogonal and oblique was selected for modeling. To address magnetic saturation in the stator tooth crown, a compensation permeance (CP) method dynamically adjusts permeance, correcting nonlinear effects and improving field distribution accuracy. In addition, when considering rotor rotation, the dynamic switching of this model can be achieved merely by altering the permeance and magnet motive force (MMF) within the fixed magnetic circuit of the rotor region. Finally, a PMSM test platform was built to calculate the flux linkage, back EMF, air-gap flux density and torque, and compared with the finite element analysis, lumped parameter magnetic circuit model and experimental data, the accuracy and effectiveness of the AEMN model were verified.