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. 04, 2006
Filed:
Jul. 18, 2003
Benno Doemen, St. Georgen, DE;
Benno Doemen, St. Georgen, DE;
ebm-papst St. Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
A motor, suitable for driving a fan, features a plain bearing () that contains ferromagnetic material and serves for radial support of a rotor shaft () made of ferromagnetic material. The shaft () is arranged rotatably and axially displaceably in that plain bearing (), and has a free end (). Provided at the free end is a thrust bearing which has a dome-shaped end () provided at that free end (), and a contact member (), coacting with the latter dome, the contact member being made at least partially of ferromagnetic material. Also provided is at least one permanent magnet () in order to form a magnetic circuit () from a first magnet pole () via the plain bearing (), the free shaft end () and its dome-shaped end (), and the contact member () to the other magnet pole (), and thereby to bring about a defined magnetic attractive force between the dome-shaped end () and the contact member (). The magnetic force minimizes rattling of the shaft (), even in vibration-prone environments.