The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 26, 1996
Filed:
Oct. 03, 1994
Kenichi Myokan, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
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.