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. 22, 2014
Filed:
Feb. 25, 2011
Francisco Rojo Lulic, St. Georgen, DE;
Francisco Rojo Lulic, St. Georgen, DE;
EBM-Papst St. Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
An electronically commutated external-rotor motor has an internal stator (), having a stator lamination stack () and a winding arrangement () associated therewith. the latter, as well as a central opening () of the stator lamination stack (), in which opening a bearing tube () is arranged. The motor further has a permanent-magnet external rotor () separated from the stator lamination stack () by a magnetically effective air gap (), which rotor has a shaft () that is journalled in the bearing tube (). First and second rolling bearings () are arranged at a distance from one another in the bearing tube (). The first rolling bearing (), adjacent the rotor hub, is a floating bearing, while the second rolling bearing (), near the shaft end () remote from the hub (), is braced with one side against a shoulder () provided in the bearing tube (). A compression spring () urges the two bearings toward one another, so that they serve as both an axial bearing and a radial bearing for the motor, thereby providing improved durability and longer service life.