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:
Nov. 14, 1995
Filed:
Aug. 15, 1994
Larry Hutsell, Longmont, CO (US);
Maxtor Corporation, San Jose, CA (US);
Abstract
A method for starting spin-up of a spindle motor in a hard disk drive. When power is initially applied to the spindle motor, the spindle motor is set to a first commutation state. The spindle motor is maintained in this first commutation state for a pre-determined period of time to allow the spindle motor to reach a known null point. Thereupon, the spindle motor is advanced to a second commutation state. The spindle motor is then maintained at this second commutation state for another pre-determined period of time. Finally, the spindle motor is advanced two successive commutation states to a peak torque curve. Once the spindle motor has started spinning, the commutation process is controlled according to the sensed back EMF voltage being generated in the off-phase.