| 摘要 |
PURPOSE:To reduce vibration at the time of rotation regardless of the position of use of a motor by bearing a motor rotator on a supporting shaft via dynamic pressure radial bearing and also by bearing the collar part of the rotator on a mounting base via thrust bearing. CONSTITUTION:A rotor magnet group 8 or rotor magnetic material is provided on the outer peripheral face of the cylindrical member 6b of a motor rotator 6 and further a stator coil group 5 is pro-. vided on the inner peripheral face of the central hole of a cylindrical supporting shaft 2 in the manner of corresponding to the rotor magnet group 8 or rotor magnetic material. Also, the inner peripheral face of the motor rotator 6 and the outer peripheral face of the cylindrical supporting shift 2 are borne via radial bearing 4 and the collar part 6a of the motor rotator 6 is borne on the mounting base 1 via thrust bearing 3. Further, the radial bearing 4 and thrust bearing 3 are formed as dynamic pressure bearings, respectively. Because the radial bearing supports a part over the range including the center of gravity of the motor rotator in this manner, an apparatus can operate in a range, where it has a load-carrying capacity enough, so that a dynamic pressure can increase to reduce vibration in the radial direction. |
