Automatic balancing spindle motor
Disclosed is a spindle motor comprising: an integral turntable including: a table on which a rotating body to be installed, and an inner side wall and an outer side wall formed to be recessed upwards at a portion therebetween on a lower surface of the table so that a predetermined hollow is formed, a surface of thereof being formed slant; a ball cover for covering a ball inserted into the hollow and the hollow; a rotation shaft an upper portion of which is inserted into a center of the integral turntable; a bearing supporting a lower portion of the rotation shaft; a coil formed on an outside of the rotation shaft; and a magnet formed on an outside of the coil.
1. A spindle motor, comprising:
a bearing housing having a bearing inserted therein;
a shaft rotatably supported by the bearing;
a stator disposed around the bearing housing;
a rotor facing the stator, the rotor being configured to rotate with the shaft; and
a turntable coupled to a portion of the shaft exposed from the bearing housing, the turntable including:
a table having an upper surface and a lower surface, wherein a disk is mountable on the upper surface of the table;
a first inner side wall, a first upper wall, and a first outer side wall forming a first annular hollow portion at a lower surface of the table; and
a second upper wall and a second side wall including a second inner side wall and a second outer side wall forming a second annular hollow portion at a lower surface of the table, wherein the second annular hollow portion is closer to the shaft than the first annular hollow portion;
a ball inserted into the first annular hollow portion; and
a ball cover covering an opening of the first annular hollow portion at the lower surface of the table,
wherein the first outer side wall widens as it travels downward toward the lower surface of the table.
2. The spindle motor according to claim 1 , wherein the first annular hollow portion is deeper than the second annular hollow portion.
3. The spindle motor according to claim 1 , wherein a height of the portion of the table between the first annular hollow portion and the second annular hollow portion is higher than a height of the lowermost surface of the table.
4. The spindle motor according to claim 1 , wherein the stator comprises a stator core having coil wound therein, and wherein the rotor comprises a rotor yoke having a magnet installed therein.
5. The spindle motor according to claim 1 , wherein a portion of the ball cover is inserted to the second annular hollow portion and contacted with the side wall of the second hollow portion.
6. The spindle motor according to claim 1 , wherein the turntable includes a third annular hollow portion at a lower surface of the table, and
wherein the third annular hollow portion is closer to the shaft than the second annular hollow portion.