| 摘要 |
PURPOSE:To make it possible to increase the outside diameter of a rotor yoke, to suppress the rise of the temperature of stator and also to reduce the production cost. CONSTITUTION:A cylindrical bearing 14 supports a through type rotating shaft 12. A stator coil 22 is arranged around the bearing 14. Outer shape of a rotor yoke 24 is formed to a cup shape, and the rotor yoke is attached to one end of the rotating shaft 12 so as to cover the stator coil 22. At the other end of the rotating shaft 12, a turn table 32 for placing a disc is attached. At each end portion of the rotating shaft 12, the rotor yoke 24 and the turn table 32 are so attached that they touch each end face of the bearing 14 thereby restricting the movement of the rotating shaft 12 in a thrust direction. |
