Technique for partially strengthening electrical steel sheet of IPM motor using cavitation peening

O. Takakuwa, M. Nishikawa, H. Soyama

Research output: Contribution to journalArticle

Abstract

Cavitation peening (CP), which utilises the impact caused by cavitation bubbles collapsing, can improve the fatigue strength of metallic materials as well as the yield stress and tensile strength. The rotor cores in interior permanent magnet motors use electrical steel sheet. In order to increase the permissible rotating speed of the motor and achieve high efficiency, the mechanical strength of the stress concentration area in the steel sheet where the magnet is pressed needs to be enhanced. In the present paper, to improve the yield stress and tensile strength, the steel sheet was peened by CP. The peening effect on these mechanical properties was evaluated by tensile and indentation tests. The experimental results from the tensile tests revealed that CP can increase the yield stress by 22% compared to that before CP. In addition, the yield stress and tensile strength increased along with the CP processing time.

Original languageEnglish
Pages (from-to)1422-1426
Number of pages5
JournalEnergy Materials: Materials Science and Engineering for Energy Systems
Volume6
Issue number1
Publication statusPublished - 2012 Dec 1

Keywords

  • Cavitation peening
  • Electrical steel
  • IPM motor
  • Indentation
  • Mechanical property
  • Yield stress

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology

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