A Study of Soft Magnetic Composite Suitable for High Efficiency of an Axial Gap Motor

Keisuke Nakamura, Masatsugu Takemoto, Koji Orikawa, Satoshi Ogasawara, Tatsuya Saito, Asako Watanabe, Tomoyuki Ueno

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

Abstract

An axial gap motor using neodymium bonded magnet, which our research group has proposed, achieved high torque density and high efficiency at high torque region in the previous paper. However, further improvement in efficiency is required in a wide operation range including not only high torque region but also low torque region. Hence, this paper discusses soft magnetic composite (SMC) suitable for high efficiency of the proposed axial gap motor. In the SMC, there is a trade-off relationship between low iron loss characteristic and high magnetic permeability. Therefore, at low torque region, the efficiency of the axial gap motor using the SMC was lower than that of the radial gap motor using the electromagnetic steel sheet. The proposed axial gap motor adopts a coreless rotor structure. Thus, it is possible to suppress the torque reduction, because the magnetic circuit of the proposed axial gap motor is hardly affected by the magnetic permeability of the stator core due to the large magnetic reluctance of the coreless rotor. For the proposed axial gap motor, HX3 of the newly material having lower iron loss characteristic than the electromagnetic steel sheet is developed, even though the magnetic permeability decreases. Consequently, improvement of efficiency and high torque are compatible by HX3. In this paper, we show the material properties of HX3 and the experimental results of a prototype machine of the proposed motor using HX3 of the newly material. From the experimental results, we report that the proposed motor can achieve improvement of efficiency around low torque region.

Original languageEnglish
Title of host publicationProceedings - 2018 23rd International Conference on Electrical Machines, ICEM 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages32-38
Number of pages7
ISBN (Electronic)9781538624777
DOIs
Publication statusPublished - Oct 24 2018
Externally publishedYes
Event23rd International Conference on Electrical Machines, ICEM 2018 - Alexandroupoli, Greece
Duration: Sep 3 2018Sep 6 2018

Publication series

NameProceedings - 2018 23rd International Conference on Electrical Machines, ICEM 2018

Conference

Conference23rd International Conference on Electrical Machines, ICEM 2018
CountryGreece
CityAlexandroupoli
Period9/3/189/6/18

Keywords

  • Axial gap motors
  • Coreless rotor structure
  • Low iron loss characteristic
  • Magnetic permeability
  • Neodymium bonded permanent magnet
  • Soft magnetic composite

ASJC Scopus subject areas

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

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