Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1994-10-03
1996-03-26
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 9807, 360 9904, G11B 1702, G11B 5016
Patent
active
055026052
ABSTRACT:
Disclosed are a spindle motor for rotating a disk and a magnetic disk apparatus using this motor. This spindle motor comprises: a spindle shaft secured to a housing for the disk apparatus; a spindle hub including a flange having its bottom surface to which an inner peripheral surface of said disk is fixed and rotatably attached to the spindle shaft; a ring-like permanent magnet fitted to the spindle hub; a plurality of stators attached in concentric positions in face-to-face relationship with the ring-like permanent magnet; and a plurality of armature coils wound on each of the stators. With this construction, an internal space of the spindle hub can be enlarged, and, therefore, a diameter of the permanent magnet can be increased. Besides, the number of windings of the armature coil can be also increased. This leads to an increment in torque constant, and the motor of lower dissipation power is attainable.
REFERENCES:
patent: 4905110 (1990-02-01), Krum et al.
patent: 5216557 (1993-06-01), Elsaesser et al.
patent: 5291357 (1994-03-01), Uda
Fujitsu Limited
Wolff John H.
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