Spindle motor and magnetic fluid seal apparatus used therefor
AssigneeNippon Densan Corporation
InventorsYoshiaki Nakanishi, Kenjiro Okamoto
Life of this patent
Estimating the term…
Abstract
A spindle motor comprising a stationary member, a hub rotatably supported on the stationary member via a pair of bearing members, and a magnetic fluid seal disposed outwardly of at least one of the pair of bearing members. A passageway or conduit hole is provided to conduct between an annular space separated by the stationary member, the magnetic fluid seal means, the rotor and the other of the bearing member and the inside of the motor. Furthermore, a magnetic fluid holder in the magnetic fluid seal is provided.
Claims6
A spindle motor comprising a stationary member, a rotor rotatably supported on the stationary member via a pair of bearing members, and a magnetic fluid seal means disposed outwardly of at least one of the pair of bearing members, wherein a conduit hole is provided between an annular space bounded by the stationary member, the magnetic fluid seal means, the rotor and one of the bearing members and the inside of the motor, and the annular space and the inside of the motor are connected via the conduit hole.
Dependencies are inferred from the claim text.