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. 08, 1993
Filed:
Dec. 19, 1990
James H Morehouse, Jamestown, CO (US);
James A Dunckley, Boulder, CO (US);
David M Furay, Boulder, CO (US);
Michael R Utenick, Englewood, CO (US);
Integral Peripherals, Inc., Boulder, CO (US);
Abstract
A spin motor assembly of a disk drive apparatus includes a stator having a plurality of wound coils associated therewith, and a rotor having a plurality of magnetic poles. Each winding structure of the stator is made up of two winding portions, with only one winding portion being used to drive the rotor relative to the stator upon drive current being applied to the winding structure, but with both winding portions being used to generate back electromotive force when drive current is cut off from the winding structure. This generated electromotive force is used to actuate an actuator motor to unload the read-write heads from the disk surface. As an alternative, each winding structure of the stator is made of a single winding, and the winding structures are used successively to drive the rotor relative to the stator, but with at least two winding portions generating back electromotive force when drive current is cut off.