Spindle motor with the stator core supported by a resin member
AssigneeNippon Densan Corporation
InventorsYuji Morioka, Masanobu Chuta, Kuniyasu Iwazaki, Kihachiro Ohta
Life of this patent
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Abstract
A spindle motor having a housing, a hub member rotatable relative to the housing, a bearing disposed between the housing and the hub member, a rotor magnet mounted on the hub member, and a stator disposed in a facing relationship with the rotor magnet. The hub member includes a supporting wall portion, which cooperates with the stator to constitute an air seal structure. A magnetic fluid seal is provided at a position outward of the bearing, and includes a conductive plate for grounding static electricity. The bearing is comprised of a radial ball bearing, which includes certain improvement.
Claims5
A spindle motor having a housing, a hub member rotatable relative to said housing, a bearing means disposed between said housing and said hub member, a rotor magnet mounted on said hub member, and a stator mounted on said housing in such a manner as to face said rotor magnet, wherein:
- said housing has an axial portion and a stator-fixing portion, said hub member has a hub body on which a recording member is to be set, and a supporting wall portion axially extending from an inner peripheral position of said hub body thereof, said hub member being rotatably supported by said axial portion through said bearing means;
- said stator has a stator core disposed in an annular space defined by said hub body and said supporting wall portion, said stator core being fixed to said stator-fixing portion through a supporting member formed by a synthetic resin;
- said stator core has a positioning notch formed in a lower end portion thereof, said notch being covered with part of said synthetic resin;
- the outer peripheral surface of said supporting wall portion and the inner peripheral surface of said stator core extends while facing each other over a sufficient axial length thereof with a slight radial gap defined therebetween;
- and
- said supporting wall portion and said stator core cooperate with each other to function as an air seal structure.
Dependencies are inferred from the claim text.