Cogging Force Optimization of Double-Sided Tubular Linear Machine with Tooth-Cutting

Liang Guo, Qi Zhou, Michael Galea, Wenqi Lu

Research output: Journal PublicationArticlepeer-review

6 Citations (Scopus)


The double-sided tubular linear machine (DSTLM) has a more compact structure than general single-sided motors, resulting in a higher power density, typically at the cost of a higher cogging force. To reduce this aspect and make it more suitable for applications in wave energy conversion systems or elevator driver systems, a new tooth-cutting topology is proposed in this article. The Schwarz-Christoffel mapping method is used to model and analyze the magnetic field and cogging force of the DSTLM. Based on the analytical model and the relationships between the cutting dimensions and the force performances, optimization is carried out by using a differential evolution algorithm. The optimization and the experiment results show that the proposed tooth-cutting topology can effectively reduce the cogging force at the small cost of weakening average thrust.

Original languageEnglish
Pages (from-to)7161-7169
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Issue number7
Publication statusPublished - 4 Aug 2021


  • Analytical modeling
  • Double-sided
  • Optimization
  • Tooth-cutting
  • Tubular motor

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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