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:
Jun. 18, 1996
Filed:
Jun. 03, 1994
Gary M Peter, Boise, ID (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A low profile memory disk assembly includes a disk spindle motor, which is mounted in a housing, such as a thin, flat memory cassette housing. A hub of the disk spindle motor rotor mounts at least one disk. The hub also has a peripheral surface which mounts a permanent magnet ring. The housing has a recess bounded by thicker housing regions. The recess has a flat base. A salient pole stator for the motor is mounted to the flat base of the recess in a semicircular recess portion of the recess adjacent to the thicker housing sections to be stiffened or reinforced thereby. The motor rotor is journaled to the base within and concentric to the salient pole stator. The peripheral surface of the permanent magnetic ring defines radial gaps with the tips of the radially disposed salient poles of the salient pole stator. Radially magnetized, alternately poled, equally circumferentially spaced, permanent magnet poles in the permanent magnet ring, different in number from the number of salient poles of the salient pole stator, produce permanent magnet fields which interact with the electromagnetic fields of the salient poles to produce rotation of the motor rotor.