关键词: 单边直线感应电机, 磁动势三维模型, 三维连续线电流密度, 气隙磁场

Abstract: To address the issues of discontinuous primary winding current density, inaccurate phase and low accuracy in air-gap magnetic field analysis of linear induction motor ( LIM) , a three-dimensional ( 3 D) model of the primary winding magnetomotive force ( MMF ) for a single-sided LIM was established using the primary extension model . A continuous current density model with accurate phase angle, accounting for the half-filled slots at the ends of the primary windings was derived. Based on Maxwell’ s equations, the vector potential equation in the air-gap region of the single-sided LIM was solved, yielding a 3 D analytical solution for the air-gap magnetic field. The influence of the end effect on motor thrust was analyzed using the air-gap magnetic field results. A comparison between the 3 D analytical results and finite element 3 D simulation results showed a high degree of consistency, validating the accuracy of the continuous current density model. This demonstrates that the 3 D MMF-based magnetic field analysis method can effectively improve the accuracy of air-gap magnetic field solutions and the precision of electromagnetic thrust calculations in single-sided LIMs.

Key words: single-sided linear induction motor ( SLIM ), three-dimensional model of magnetomotive force, threedimensional continuous line current density, air-gap magnetic field