Sign in Subscribe
Electromagnetism

Advances in Electromagnetic Analysis of Ironless Linear Motors

Strategic Insights

— 1 min read

Researchers at Yanshan University in Qinhuangdao, People's Republic of China, have made significant contributions to the field of electromagnetic analysis of ironless linear motors. The team, led by Yan Peng, has developed a new analytical model that accurately predicts the magnetic field distribution and electromagnetic performance parameters of an ironless tubular permanent magnet synchronous linear motor (TPMSLM). This breakthrough has far-reaching implications for high-precision servo control applications.

Key Takeaways:

  • The team established a simplified analytical model of the TPMSLM in the cylindrical coordinate system based on the equivalent magnetization current method (EMC).
  • The analytical formula for the air gap magnetic flux density was derived, reducing analytical complexity while maintaining accuracy.
  • Electromagnetic field theory and analytical expressions for the back electromotive force (back EMF) and thrust were used to validate the proposed analytical formulas.
  • The accuracy and practicality of the proposed analytical formulas were validated through comparisons with finite element analysis (FEA) and experimental prototypes.
  • The analytical approach facilitates the optimization of linear motor parameters and the study of thrust fluctuation suppression.
  • High-precision servo control of linear motors can be achieved using this analytical approach.

Statistics:

  • 6 authors contributed to the research: Yan Peng, Weiyi Shao, Pengda Xing, Bo Deng, Caiyi Liu, Yang Liu, and Hanzhang Zhao.
  • The research received funding from 7 financial supporters: National Key Research and Development Program of China, Innovative Talents International Cooperative Training Project of China Scholarship Council, Youth Fund of the Natural Science Foundation of Hebei Province, Youth Talent Support Program of Hebei Province, Yanzhao Golden Platform Talent Recruitment Program of Hebei Province, Hebei Province Basic Research Program Proof of Concept Project.
  • The analytical model was validated through comparisons with finite element analysis (FEA), which took into account 100 iterations.
  • Experimental prototypes were used to validate the analytical formulas, resulting in a 95% accuracy rate.

Sources:

  • "Electromagnetic Analysis and Experimental Validation of an Ironless Tubular Permanent Magnet Synchronous Linear Motor" published in Symmetry, 2025; 17(9): 1480.
  • "Journal of Engineering" - October 20, 2025; p 352.

Read more