3-D optimal design of laminated yoke of billet heater for rolling wire rod using ON/OFF method

Norio Takahashi, Shunsuke Nakazaki, Daisuke Miyagi, Naoki Uchida, Keiji Kawanaka, Hideyuki Namba

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The optimization method using the ON/OFF sensitivity analysis has an advantage that an epoch-making construction of magnetic circuit may be obtained. Therefore, it is attractive for designers of magnetic devices. We have already developed the ON/OFF method for the optimization of a static magnetic field problem, and the effectiveness is verified by applying it to the optimization of magnetic recording heads. In this paper, the ON/OFF sensitivity method is extended to the optimization of the eddy current problem using the adjoint variable. The newly developed ON/OFF method is applied to the determination of the optimal topology of the yoke of the billet heater for rolling wire rod. As a result, the optimal shape of yoke, which we could not imagine beforehand can be obtained. It is shown that the local heating of the yoke was reduced without decreasing the heating efficiency.

Original languageEnglish
Pages (from-to)115-123
Number of pages9
JournalArchives of Electrical Engineering
Issue number1
Publication statusPublished - 2012 Mar 1


  • ON/OFF method
  • billet heater
  • eddy current problem
  • step-by-step method

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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