A Deeply-Buried Permanent Magnet Bearingless Motor with 2-pole Motor Windings and 4-pole Suspension Windings

Masatsugu Takemoto, Michio Uyama, Akira Chiba, Hirofumi Akagi, Tadashi Fukao

Research output: Contribution to journalConference articlepeer-review

31 Citations (Scopus)


Various permanent magnet bearingless motors, which can control rotor radial positions with magnetic force actively, have been proposed and developed. These bearingless motors are characterized by integration of permanent magnet motors and magnetic bearings. However, these bearingless motors cannot generate suspension force effectively, because suspension flux necessary for generating the suspension force passes through permanent magnets which have large magnetic reluctance. Accordingly, this paper proposes a novel deeply-buried permanent magnet bearingless motor with 2-pole motor windings and 4-pole suspension windings. In the proposed motor, the suspension flux does not pass through the permanent magnets. Thus, the proposed motor is shown to generate suspension force effectively. In addition, a control method of the proposed motor and its drive system are theoretically analyzed, and it is shown experimentally that the proposed drive system is effective in realizing stable operation of magnetic suspension.

Original languageEnglish
Pages (from-to)1413-1420
Number of pages8
JournalConference Record - IAS Annual Meeting (IEEE Industry Applications Society)
Publication statusPublished - 2003
Externally publishedYes
Event2003 IEEE Industry Applications Conference; 38th IAS Annual Meeting: Crossroads To Innovation - Salt Lake City, UT, United States
Duration: Oct 12 2003Oct 16 2003


  • Bearingless motors
  • Magnetic bearings
  • Magnetic suspension
  • Permanent magnet motors

ASJC Scopus subject areas

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


Dive into the research topics of 'A Deeply-Buried Permanent Magnet Bearingless Motor with 2-pole Motor Windings and 4-pole Suspension Windings'. Together they form a unique fingerprint.

Cite this