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:
Apr. 01, 2003
Filed:
Dec. 29, 2000
Ender T. Eroglu, San Jose, CA (US);
Paolo Menegoli, San Jose, CA (US);
Whitney H. Li, San Jose, CA (US);
STMicroelectronics, Inc., Carrollton, TX (US);
Abstract
A method and system are disclosed for spinning the spindle motor of a disk drive from a stationary state to an operable state that is suitable for performing a memory access operation. The method and system include energizing the polyphase motor in a first predetermined commutation phase; detecting whether a zero crossing of a back electromotive force (bemf) signal corresponding to the first predetermined commutation phase occurs; sensing whether the polyphase motor advanced to a next successive commutation phase relative to the first predetermined commutation phase; and performing an acceleration procedure to accelerate the speed of the polyphase motor towards a desired speed based upon a detected zero crossing of the bemf signal and an affirmative determination that the polyphase motor advanced to a next successive commutation phase relative to the first predetermined commutation phase.