日本応用磁気学会誌
Online ISSN : 1880-4004
Print ISSN : 0285-0192
ISSN-L : 0285-0192
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18 巻, 1 号
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論文
  • 鏡筒内蔵型ダイレク卜ドライブモータの磁界解析
    高野 博夫, 勢木 真一
    1994 年 18 巻 1 号 p. 46-51
    発行日: 1994/02/01
    公開日: 2013/01/11
    DOIhttps://doi.org/10.3379/jmsjmag.18.46
    ジャーナル オープンアクセス
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      The driving motor of a camcorder shifts a zoom lens in the direction of the optical axis by means of reduction gear trains. In a majority of camcorders the driving motor is outside the lens barrel. To realize more compact, lighter, and cheaper camcorders, however, it will be necessary to design a built-in direct-drive motor housed inside the lens barrel. A new motor satifying these tough requirements is proposed in this paper. In paticular, three types of rotor―a separate-screw rotor with a cylindrical magnet, a screwed magnet rotor, and a cascade-screw rotor with a brick-shaped magnet―are analyzed with respect to their magnetic fields and torques. To obtain a larger torque, air-gap magnetic flux densities linked to armature windings have to be made higher.
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