Examination for the higher efficiency in a ferrite permanent magnet 10 kW in-wheel axial-gap motor with coreless rotor structure

Kodai Sone, Masatsugu Takemoto, Satoshi Ogasawara, Kenichi Takezaki, Wataru Hino

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

12 Citations (Scopus)

Abstract

Powerful rare earth permanent magnets (PMs) are generally utilized in in-wheel PM synchronous motors for electric city commuters. However, the use of rare earth PMs has become undesirable due to high prices. An in-wheel PM synchronous motor that does not employ rare earth PMs therefore needs to be developed. We have previously proposed an in-wheel axial-gap motor that can generate high torque density and has features such as a coreless rotor structure with ferrite PMs and a reduction gearbox inside the stator. Through further research, we confirmed that suppression of eddy current loss arising in the rotor is important for attaining higher efficiency in high output motors. Accordingly, here we introduce an improved rotor with slits which can suppress eddy current loss. The results of experiments on a new prototype show that the improved rotor is effective in producing high efficiency and can satisfy the properties demanded of the in-wheel motors for electric city commuters.

Original languageEnglish
Title of host publication2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages5885-5892
Number of pages8
ISBN (Electronic)9781479956982
DOIs
Publication statusPublished - Nov 11 2014
Externally publishedYes

Publication series

Name2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

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