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:
Sep. 02, 2008
Filed:
Oct. 28, 2005
András Lelkes, Stuttgart, DE;
Markus Gummich, Pfaffenweiler, DE;
András Lelkes, Stuttgart, DE;
Markus Gummich, Pfaffenweiler, DE;
Minebea Co., Ltd., Nagano-ken, JP;
Abstract
The invention relates to a brushless DC motor having an at least two-pole permanent magnet rotor and an at least two-pole stator whose poles carry an at least single-strand stator winding which can be energized with a current according to the rotor position by means of an electronic commutation device, there being a substantially uniform cylindrical air gap between the rotor and the stator. The rotor is characterized in that at least one stator pole, or a specially provided auxiliary pole having an auxiliary winding, is provided which is energized with a current to start up the motor. In accordance with a preferred embodiment of the invention, the auxiliary winding can additionally be used as a sensor winding to determine the position of the rotor.