Development of a four-axis actively controlled consequent-pole-type bearingless motor

Yoshihiro Asano, Akira Mizuguchi, Miya Amada, Junichi Asama, Akira Chiba, Masahide Ooshima, Masatsugu Takemoto, Tadashi Fukao, Osamu Ichikawa, David G. Dorrell

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


In this paper, a design-optimization method for a consequent-pole bearingless motor with a rather large air-gap length is presented. A rotor iron and permanent-magnet structure is proposed which enhances the suspension-force capability during startup. Magnetic saturation in the rotor-iron pole area is solved, and the stator iron is designed so that magnetic saturation is avoided. The design optimization is based on finite-element-method analysis. It is shown that startup is achieved from the touch-down condition in the experiments.

Original languageEnglish
Pages (from-to)1378-1386
Number of pages9
JournalIEEE Transactions on Industry Applications
Issue number4
Publication statusPublished - 2009
Externally publishedYes


  • Bearingless motor
  • Consequent-pole-type rotor
  • Magnetic bearing
  • Permanent-magnet (PM) motor

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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