| 摘要 |
According to an embodiment of the present invention, a spindle motor comprises: shafts; sleeves having shaft grooves in the center to support the shafts to be rotated; bases having support portions of a tube shape which have hollow portions to insert and fix the sleeves; rotors having hubs, which are fixed into upper end portions of the shafts and extended outward, and skirt portions, stretched vertically downward on edges of the hubs; and stators having cores of a ring shape fixedly arranged in upper portions of the bases, and having coils wounded on the cores. The sleeve comprises: a first pipe shape portion which restricts the shaft groove; a second pipe shape portion having a concentric shaft with the diameter larger than that of the first pipe shape portion; and a connection portion which connects the first pipe shape portion and the second pipe shape portion. |
