| 摘要 |
PROBLEM TO BE SOLVED: To provide a spindle motor having magnetic bearings in which permanent magnets are provided between its rotary shaft and hub and the rotary shaft can rotate without friction by the repulsive force between the same polarity poles and the attractive force between the different polarity poles. SOLUTION: Shaft part permanent magnets 4a and 4b having different polarities are attached to the upper part and lower part of a rotary shaft 3. Further, housing part permanent magnets 5a and 5b having different polarities are attached to the upper part and lower part of the inner circumferential surface of the inner cylindrical part 11 of a housing assembly 1. The rotary shaft 3 can rotate without contact as it remains lifted by the repulsive force and attractive force between the permanent magnets 4a-4b and 5a-5b. |
