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:
Aug. 04, 2009
Filed:
Jan. 04, 2006
Martin Engesser, Donaueschingen, DE;
Stefan Schwamberger, Hermsdorf, DE;
Martin Engesser, Donaueschingen, DE;
Stefan Schwamberger, Hermsdorf, DE;
Minebea Co., Ltd., , JP;
Abstract
The invention relates to a spindle motor having a fluid dynamic bearing system and comprises a rotor having a cylindrical shaft, a first bearing disk disposed at one end of the shaft and a second bearing disk that is disposed on the shaft at a spacing to the first bearing disk in such a way that an annular disk-shaped space is formed between the two bearing disks. A stator is provided that has an annular disk-shaped component which is disposed in the annular disk-shaped space formed by the rotor, the respective opposing bearing surfaces of the stator and of the rotor being separated from one another by a bearing gap filled with a fluid medium. The bearing system comprises at least one radial bearing formed between the outside circumference of the shaft and the inside circumference of the annular disk-shaped component and two axial bearings formed by the two end faces of the annular disk-shaped component and the respective opposing end faces of the bearing disks, an electromagnetic drive unit being provided to drive the rotor.