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. 13, 1990
Filed:
Oct. 04, 1988
LaVerne F Knappe, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A magnetic disk drive spindle motor start routine is provided that supersedes the spindle motor primary motor control when a stuck condition, wherein one of more transducer heads are adhered to the disk surface, is found to exist at start. The motor is provided current pulses at the resonant frequency of the worst case stuck system with the sequence limited to a number of pulses that will not cause the torque amplification to exceed a value that would damage the head/suspension assemblies. In another embodiment, the stuck system is provided with a motion sensor to sense positive and negative motion during oscillation of the stuck system and provide current to the motor when motion is positive to effect torque amplification.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile