New Eddy Current Magnetic Network Method for Eddy Current Loss Calculation of Flat Wire Windings in Electric Vehicle Motor

This article describes a new numerical calculation method for the eddy current loss of flat wire windings in the electric vehicle motor, namely eddy current magnetic network method (ECMNM). The method is based on the principle of regional magnetic field simulation (RMFS), coupled with magnetic network modeling technology and eddy current field equation. Compared to the finite element method (FEM) commonly used for analyzing windings eddy current loss, the main advantages of the ECMNM are its fast computation speed, high calculation accuracy, and the ability to parameterize the motor structural parameters, which is conducive to motor design. Compared with other previous analytical methods, the ECMNM can accurately consider the slot structure, windings arrangement, and dimensions. In particular, it can accurately consider the influence of the transient rotor rotating magnetic field and the magnetic saturation of the stator and rotor core on the eddy current loss of the stator windings under different operating conditions. The ECMNM has both versatility and high computational accuracy, while also effectively improving calculation speed. In this paper, different stator slot types and windings arrangements are adopted. The ECMNM is compared with the FEM under multiple operating conditions, and verified by experiments.