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<p>Due to the irregular air-gap length and asymmetric secondary overhang in single-sided linear induction motors (SLIMs) used for rail transit, the dimensions of the secondary play a crucial role in determining the electromagnetic and force characteristics of the motor. Therefore, this paper investigates the effects of secondary width and displacement distance on key performance characteristics, including magnetic flux distribution, induced eddy currents, and electromagnetic forces, using an analytical approach. First, an analysis model used for analyzing the electromagnetism problem and a 2-D polygonal boundary model of Schwarz-Christoffel method used for obtaining the transversal force are established. Second, it defines several coefficients to quantitatively analyze variations in the distortion and average amplitude of the magnetic flux and induced eddy current under different secondary dimensions. Third, the three-dimensional forces and secondary parameters are derived based on the computed electromagnetic field quantities. Finally, the experimental measurement is implemented on a test rig for the prototype motor, and it verifies the accuracy of the analysis method proposed in this paper.</p>

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Three-dimensional Forces in Linear Induction Motors with Different Sizes of Asymmetric Composite Secondary

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Dihui Zeng,
  • Qiongxuan Ge,
  • Ke Wang

摘要

Due to the irregular air-gap length and asymmetric secondary overhang in single-sided linear induction motors (SLIMs) used for rail transit, the dimensions of the secondary play a crucial role in determining the electromagnetic and force characteristics of the motor. Therefore, this paper investigates the effects of secondary width and displacement distance on key performance characteristics, including magnetic flux distribution, induced eddy currents, and electromagnetic forces, using an analytical approach. First, an analysis model used for analyzing the electromagnetism problem and a 2-D polygonal boundary model of Schwarz-Christoffel method used for obtaining the transversal force are established. Second, it defines several coefficients to quantitatively analyze variations in the distortion and average amplitude of the magnetic flux and induced eddy current under different secondary dimensions. Third, the three-dimensional forces and secondary parameters are derived based on the computed electromagnetic field quantities. Finally, the experimental measurement is implemented on a test rig for the prototype motor, and it verifies the accuracy of the analysis method proposed in this paper.