Investigation of Operational Characteristics and Efficiency Enhancement of an Ultrahigh-Speed Bearingless Motor at 100 000 r/min

Yu Fu, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This article introduces the operational characteristics of an ultra-high-speed bearingless motor with 2-pole concentrated motor windings and 4-pole concentrated suspension windings. Experiments with a prototype machine indicate that iron loss is the largest component of losses in the proposed bearingless motor. Therefore, in order to reduce the iron loss, comparison of the experimental results and the 3D-FEM results is discussed. As a result, because it is turned out that iron loss of the switching frequency component accounts for a large proportion in total iron loss, a method of enhancing efficiency of the proposed bearingless motor by means of high switching frequency using SiC-MOSFET is examined. The experimental results with the examined method show that the prototype machine can attain the high efficiency of 94.3% at rated operation of 1.70 kW and 100,000 r/min in spite of including suspension input power for magnetic levitation. In addition, operational characteristics comparison of the bearingless motor at switching frequency of 40 kHz, 80 kHz and 120 kHz is discussed in detail.

Original languageEnglish
Article number9064934
Pages (from-to)3571-3583
Number of pages13
JournalIEEE Transactions on Industry Applications
Volume56
Issue number4
DOIs
Publication statusPublished - Jul 1 2020
Externally publishedYes

Keywords

  • Bearingless motor
  • SiC-MOSFET
  • magnetic levitation
  • magnetic suspension
  • ultrahigh-speed

ASJC Scopus subject areas

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

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