| 摘要 |
PROBLEM TO BE SOLVED: To provide a shaft structure of a motor wherein noise of a motor which is caused by bearing sound from a shaft can be reduced by reducing the bearing sound. SOLUTION: A spherical surface whose radius is R is formed on a tip of the shaft 4 of a rotor, and the center of the spherical surface is shifted byΔt from the center of the shaft 4. An abutting position of the spherical surface to a thrust bearing 5 is shifted byΔt from the center of the shaft. When load in a thrust direction is applied to the shaft, rotation is to be generated at an abutting part of the thrust bearing 5, and side pressure is applied to a bearing 3, so that shaft shaking at the time of rotation is reduced.
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