To remove the restriction of attitude during application and moreover improve start and stop durability by locating a permanent magnet to the internal side of the rotor and stator in the radius direction, between both ends in the axial directions of a bearing supporting two or more radial directed loads in the axial direction.
An attracting permanent magnet 52, a permanent magnet 50 of a member to be attracted and drive magnets 54, 56 are arranged at the external side of a radial bearing 26 is the radial direction and moreover almost at the center between the upper and lower two radial bearings 26 in the axial direction. Therefore, even if attractive force is uneven due to uneven magnetization of magnets 50, 52 and the radial directed force is applied to a hub 46, this force is also loaded in the same direction on the radial dynamic pressure bearings 26 in both sides in the axial direction. As a result, a moment load is alleviated, and a large load is not easy to be applied on the radial dynamic pressure bearing 26, and friction due to contact between the rotating shaft 40 and the internal circumference surface of supporting member 20 can be reduced, when the motor is started or stopped.
OKANO HIDEO
SAKATANI IKUNORI
MAEDA ETSUO
KAMIMURA KAZUHIRO
