| 摘要 |
PROBLEM TO BE SOLVED: To realize and provide a motor equipped with a single and conical dynamic pressure gas bearing where such problems of the motor equipped with the single conical dynamic pressure gas bearing as stability of rotating posture, the realization of easily-assembling structure from which lubricant fluid is hard to leak or the like are solved, making a thinner shape and lower current to be applicable, so that simple structure and cost reduction are possible. SOLUTION: This motor comprises a shaft having a tapered surface getting gradually thinner in diameter in an approximately conical-shaped manner, a sleeve having a concave portion opposed to the shaft, lubricant fluid within gap between the shaft and the sleeve, and a magnetic means having a magnet and a magnetic substance either within the shaft or on a bottom surface of the sleeve to generate magnetic attraction between a shaft end and the bottom surface of the sleeve. Further, the features of the motor are that dynamic pressure groove is provided on the shaft or on a conical-shaped and tapered surface of the sleeve and an axial component force of magnitude of a load generated by the above dynamic pressure groove in the case of rotation and the above magnetic attraction are made to be balanced to support a rotating portion. Thereby, there is realized the motor, equipped with the single and conical gas dynamic pressure bearing, where thinner shape, lower current and cost reduction are possible controlling NRRO. |
