INNER ROTOR TYPE SPINDLE MOTOR

PROBLEM TO BE SOLVED: To simplify assembly and miniaturize an inner rotor type spindle motor using an air fluid bearing. SOLUTION: In an inner rotor type spindle motor 100, a dynamic pressure groove is formed by an inner sleeve 17 that is provided at the outer-periphery of a shaft 2 being erected at...

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Bibliographic Details
Main Author KODAMA MITSUO
Format Patent
LanguageEnglish
Published 21.12.2001
Edition7
Subjects
BEARINGS
BLASTING
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
DYNAMO-ELECTRIC MACHINES
ELECTRICITY
ELEMENTS OR CRANKSHAFT MECHANISMS
ENGINEERING ELEMENTS AND UNITS
FLEXIBLE SHAFTS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
GENERATION
HEATING
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
LIGHTING
MECHANICAL ENGINEERING
PHYSICS
ROTARY BODIES OTHER THAN GEARING ELEMENTS
SHAFTS
THERMAL INSULATION IN GENERAL
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To simplify assembly and miniaturize an inner rotor type spindle motor using an air fluid bearing. SOLUTION: In an inner rotor type spindle motor 100, a dynamic pressure groove is formed by an inner sleeve 17 that is provided at the outer-periphery of a shaft 2 being erected at a motor base 1, an outer sleeve 16 that is provided at the outer-periphery part of the inner sleeve 17 with a specific internal, a hub 5 that is mounted to the outer-periphery part of the outer sleeve 16, a rotor yoke 13 that is mounted to the outer-periphery part of the outer sleeve 16, and the outer-periphery surface of the inner sleeve 17 and the inner-periphery surface of the outer sleeve 16 to compose a radial dynamic pressure bearing. Also, the dynamic pressure groove is formed between upper and lower thrust plates 15 and 14 opposing the upper and lower surfaces of the outer sleeve 16 to compose a thrust dynamic pressure bearing. In the spindle motor 100, the diameter of the inner-periphery of the hub 5 and that of the inner-periphery of the rotor yoke 13 are set to nearly the same diameter.
Bibliography:Application Number: JP20000165576