| 摘要 |
PURPOSE:To obtain the titled motor with less number of component parts, capable of speed detection at high precision by providing a rotor, which is fixed on a capstan shaft having drive magnet on its under surface, and a speed detecting magnet on its upper surface. CONSTITUTION:The under surface of an upper plate 7 is fixed with a bearing 3, while a printed coil 1 being supported by the upper plate 7 is provided, and on the other hand, a thrust-pad 13 having thrust sheet 14 supporting the lower end of a capstan shaft and a drive coil 5 are fixed on the upper surface of a stator yoke 12. On the under surface of a rotor 2 which is fixed on the capstan shaft 4, a drive magnet 10 which constitutes a rotation drive part of the capstan shaft 4, is installed facing against the drive coil 5. On the upper surface of the rotor 2, a speed detecting magnet 11 is fixed facing against the printed coil 1. By this construction, the number of component parts is made less, enabling speed detection at a high precision. |
