Investigation of a high speed and high power density bearingless motor with neodymium bonded magnet

Yu Fu, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Citations (Scopus)

Abstract

Bearingless motors (BelMs), which can realize magnetic levitation rotation with no mechanical contact, have been proposed and developed. In general, in high speed and high output BelMs, distributed winding structure is adopted in order to suppress iron loss, and neodymium sintered permanent magnet (Nd sintered PM) is employed to achieve a high power density. However, output power fall is caused due to long coil end of the distributed winding structure because a shaft length is limited by primary bending mode under high speed rotation. Furthermore, eddy current loss easily occurs in the Nd sintered PM because of its high conductivity. It is difficult to achieve continuous high-speed and high-output operation due to the temperature raising in a rotor. Therefore, in this paper, a high speed and high power density BelM using concentrated winding stator and neodymium bonded permanent magnet (Nd bonded PM) is proposed in order to suppress output power reduction caused by the coil end and eddy current loss generated in PM. In addition, this paper indicates analysis results of various BelM models using distributed winding structure, concentrated winding structure, Nd sintered PM, and Nd bonded PM, respectively. Comparison of these results is discussed in detail and effectiveness of the proposed structure is clarified.

Original languageEnglish
Title of host publication2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509042814
DOIs
Publication statusPublished - Aug 3 2017
Externally publishedYes
Event2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017 - Miami, United States
Duration: May 21 2017May 24 2017

Publication series

Name2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017

Conference

Conference2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017
Country/TerritoryUnited States
CityMiami
Period5/21/175/24/17

Keywords

  • Bearingless motor
  • High power density
  • High speed
  • Magnetic levitation
  • Magnetic suspension
  • Neodymium bonded permanent magnet
  • Neodymium sintered permanent magnet

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Mechanical Engineering

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