Investigation on magnetic torque of multi-polarly micro rotor using shape-magnetic-anisotropy

F. Yamashita, S. Nishimura, N. Menjo, O. Kobayashi, M. Nakano, H. Fukunaga, K. Ishiyama

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


A double pole pair milli-size rotor with 1 mm in outer diameter and 0.3 mm in inner diameter was fabricated from an isotropic laminated film magnet with a non-magnetic material. Permeance coefficient distribution together with static magnetic field of the film were also estimated by using 3-D and 2-D finite element model, and the average permeance coefficient, B/μoH, could be estimated as 18.7. A torque of the isotropic film magnet with the remanence value of approximately 1 T was measured under the different field strength, and a relative torque and relative torque constant, dT/dH-gradient, of the above-mentioned magnet with the double pole pair increased by 172 % and 152 %, respectively, compared with those of an anisotropic bulk magnet with a single pole pair whose remanence value was approximately 1.3 T. It was found that use of isotropic laminated film magnet is effective in obtaining a micro multi-polarly magnetized rotor with highly dense torque.

Original languageEnglish
Article number5467532
Pages (from-to)2012-2015
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number6
Publication statusPublished - 2010 Jun


  • Isotropic film magnet
  • Laminated film magnet
  • MEMS motor
  • Micro DC brushless motor
  • Micro multi-polarly magnetized rotor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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