A Polymer-Based Air Gap Length Prediction Method with Current Injection and Fuzzy Logic Observer

Yu Zou, K. W.Eric Cheng, Chow Norbert Cheung, J. F. Pan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


In this paper, an approach combining current pulses injection and fuzzy logic observer to measure the air gap length of linear machines is proposed. A polymer enclosed by a coil is produced and selected as the test object. The characteristics and production process for the polymer is introduced and its magnetic feature has been studied. Injecting current pulses is used to calculate the self-inductance of the coil fixed on the cores that is directly influenced by the air gap length from the polymer. By using a fuzzy logic observer, the air gap length can be estimated precisely according to the variations of the self-inductance. Experimental results show the effectiveness of the proposed measurement method and the results prove that the proposed method is suitable for the air gap measurement for linear machines.
Original languageEnglish
Article number7932533
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - 1 Nov 2017


  • Air gap length
  • current pulse injection
  • fuzzy logic observer
  • polymer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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