关键词: 永磁同步电机, 冻结磁导率法, 磁钢漏磁, 端部漏感, 斜极漏感

Abstract: The accurate prediction of the external characteristics of high-speed permanent magnet synchronous motors is the core in the design of electric vehicle drive systems. The accuracy of leakage magnetic parameters is the key to limiting simulation accuracy,especially in high-speed weak magnetic regions where the sensitivity of inductance parameters increases sharply. Aiming at the limitations of the two-dimensional finite element method in calculating end leakage inductance, skewed leakage inductance,and permanent magnet leakage coefficient,a leakage decoupling theory based on the principle of frozen permeability and magnetic flux difference is proposed,and a hybrid analytical model combining two-dimensional and three-dimensional finite elements is constructed. By establishing a differentiated stator rotor combination model, precise separation of winding leakage inductance and permanent magnet leakage coefficient has been achieved. The experimental results show that the modified motor model has a simulation error of less than 2% in the external characteristics of the entire speed range, significantly improving the prediction accuracy of torque and power in the high-speed zone. This method combines the accuracy advantage of three-dimensional models with the computational efficiency of two-dimensional models, providing an effective tool for rapid iteration and precise design of motor schemes.

Key words: permanent magnet synchronous motor, frozen permeability method, magnetic flux leakage, end-winding leakage inductance, skew leakage inductance