Isotropic Nd‐Fe‐B Thick‐Film Magnets for Micro‐Rotors Prepared by PLD Method

• Masaki Nakano

  Nagasaki University Japan

• Masaru Itakura

  Kyushu University Japan

• Takeshi Yanai

  Nagasaki University Japan

• Fumitoshi Yamashita

  Minebea Co., Ltd. Japan

• Hirotoshi Fukunaga

  Nagasaki University Japan

Abstract

The flexibility of magnetization of isotropic thick‐film magnets enabled us to enhance the torque of a millimeter‐size motor comprising a multipolar magnetized rotor compared to the torque of a miniaturized motor using an anisotropic Nd‐Fe‐B sintered magnet. In order to upgrade the torque of the small motor further, an increase in the remanence value of the isotropic films is indispensable. In this study, therefore, we prepared nano‐composite Nd‐Fe‐B thick films by a high‐speed PLD (pulsed laser deposition) method with a deposition rate of approximately 40 μm/h. Resultantly, the use of additive (Zr or Nb) was effective to enhance the coercivity value of Nd‐Fe‐B thick‐film magnets with Nd‐poor composition, however it was difficult to increase the remanence values. In order to apply the thick films to a micro‐rotor, investigation on several experiments related to mechanical property was also carried out.

Journal

• Electrical Engineering in Japan

  Electrical Engineering in Japan 187 (3), 1-6, 2014-02-11

  Wiley

Keywords

• Electrical and Electronic Engineering
• Energy Engineering and Power Technology

Details

• CRID: 1360567180047722624
• NII Article ID: 210000185239
• DOI: 10.1002/eej.22513
• ISSN: 15206416
• ISSN: 04247760
• Web Site: https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Feej.22513
• Web Site: https://onlinelibrary.wiley.com/doi/pdf/10.1002/eej.22513
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