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US 2010/0148608 A1Published application
Spindle motor
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsNam Seok KIM, Pyo KIM, Sang Ok CHOI
Life of this patent
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Abstract
The spindle motor includes a rotating shaft, a rotor cover which is secured to the rotating shaft and rotates the rotating shaft, a bearing for rotatably supporting the rotating shaft, a holder for holding the bearing, and a holding magnet which is directly mounted to an inner wall of the rotor cover. In this case, the holding magnet is positioned above the bearing to prevent oil from being discharged from the bearing to the outside.
Claims5
A spindle motor, comprising:
- a rotating shaft;
- a rotor cover secured to the rotating shaft by a flange, and rotating the rotating shaft;
- a bearing rotatably supporting the rotating shaft;
- a holder to hold the bearing;
- a stator forming an electric field, coupled to the outer circumferential surface of the holder;
- a holding magnet having a rectangular cross section positioned above the bearing, the holding magnet being directly mounted to an inner wall of the rotor cover adjacent to the flange and including neodymium;
- and
- a coating layer coated on the upper surface of the stator except under the holding magnet, wherein,
- the holding magnet is positioned above the bearing and has an inner diameter larger than an inner diameter of the bearing and smaller than an outer diameter of the bearing so that its magnetic force directly affects the bearing, and is positioned above the stator and has an outer diameter larger than an inner diameter of the stator and smaller than an inner diameter of the coating layer so that its magnetic force directly affects the stator.
6 more elements
Dependencies are inferred from the claim text.