公开(公告)号：US5942824A

公开(公告)日：1999-08-24

申请号：US902333

申请日：1997-07-29

申请人： Kohei Shioya ,  Hiromu Ono ,  Hiromi Ito ,  Seiichiro Kato

发明人： Kohei Shioya ,  Hiromu Ono ,  Hiromi Ito ,  Seiichiro Kato

IPC分类号： G02B26/12 ,  H02K5/16 ,  H02K7/09 ,  H02K11/00 ,  H02K15/03 ,  H02K21/24

CPC分类号： H02K15/03 ,  G02B26/121 ,  H02K11/21 ,  H02K11/33 ,  H02K21/24 ,  H02K7/09 ,  H02K5/16

摘要： A motor comprising: a rotor which is supported via a rotating shaft in a radial direction of the rotating shaft, the rotating shaft being disposed around a fixed shaft provided on the side of a stator to form a dynamic-pressure bearing; a stator-side thrust magnet disposed in the stator so as to support the rotor with respect to the stator in a thrust direction of the rotating shaft; a rotor-side thrust magnet disposed in the rotor; and a rotating main body portion mounted to the rotating shaft of the rotor and formed integrally by a resin magnetic material, in which a main magnet portion, an FG magnet portion for generating a speed-of-rotation detecting pulse, and a rotor-side thrust magnet portion serving as said rotor-side thrust magnet are respectively polarized at predetermined positions in the rotating main body portion. As a result, the reliability of an optical deflector in which the motor is used improves and the number of parts and the number of assembling processes are both reduced due to a simple structure. Further, a balance correction operation of the rotor is eliminated so as to allow a simple manufacturing operation, and even when the rotor is rotated at high speed, a stable optical scanning operation can be effected.

摘要翻译： 一种电动机，包括：转子，其经由旋转轴沿所述旋转轴的径向被支撑，所述转轴围绕设置在定子侧的固定轴设置，以形成动压轴承; 定子侧推力磁铁，其设置在所述定子中，以在所述旋转轴的推力方向上相对于所述定子支撑所述转子; 设置在转子中的转子侧推力磁铁; 以及旋转主体部，其安装在转子的旋转轴上并由树脂磁性材料一体地形成，其中主磁体部分，用于产生转速检测脉冲的FG磁体部分和转子侧 用作所述转子侧推力磁铁的推力磁铁部分分别在旋转主体部分中的预定位置偏振。 结果，由于结构简单，使用电动机的光偏转器的可靠性得到改善，并且部件的数量和组装过程的数量均减少。 此外，除去转子的平衡校正操作以允许简单的制造操作，并且即使当转子高速旋转时，也可以进行稳定的光学扫描操作。