VOICE COIL MOTOR

• Main Author: KAWAMOTO RYUJI
• Format: Patent
• Language: English; Japanese
• Published: 08.04.2022
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

To provide a voice coil motor in which displacement can be detected while upsizing of the outer shape and an increase of the cost are suppressed.SOLUTION: A VCM (1) includes a case (6), a permanent magnet (7), a yoke-core (8), a bobbin (2), and a coil part (3). The coil part (3) includes a drive primary coil (11) that serves as a drive coil interlinking a magnetic flux of the permanent magnet (7) and also serves as a primary coil of a displacement sensor (9) which is formed of a differential transformer, and two secondary coils (12A, 12B) of the displacement sensor (9). The yoke-core (8) is disposed in the center space in the coil part (3), and serves as a core of the displacement sensor (9).SELECTED DRAWING: Figure 1 【課題】外形形状の肥大化およびコスト上昇を抑制しつつ、変位検出が可能なボイスコイルモータを提供する。【解決手段】ＶＣＭ（１）は、ケース（６）と永久磁石（７）とヨーク兼鉄芯（８）ボビン（２）とコイル部（３）とを備える。コイル部（３）は、永久磁石（７）による磁束と鎖交する、駆動コイルであると共に差動トランスよりなる変位センサ（９）の１次コイルを兼ねる駆動兼１次コイル（１１）と、変位センサ（９）の２つの２次コイル（１２Ａ，１２Ｂ）と、を含み、ヨーク兼鉄芯（８）は、コイル部（３）の中央の空間に配設され、変位センサ（９）の鉄芯を兼ねている。【選択図】図１