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:
Jul. 19, 2005
Filed:
Apr. 05, 2002
Viktor Soitu, Lappeenranta, FI;
Jaakko Sailakivi, Tampere, FI;
Pekka Laakkonen, Helsinki, FI;
Voith Paper Patent GmbH, Heidenheim, DE;
Abstract
An electric asynchronous motor for driving a shaft, a roll shell or a similar machine element includes an annular rotor and an annular stator, each having an end face at each of their respective ends. The rotor is connected to a motor shaft by way of spokes. A motor cooling system includes an internal cooling air circuit wherein an air stream flows between the rotor and the motor shaft as well as through an annular heat exchanger for transferring heat from the rotor and/or the stator to a cooling liquid. The annular heat exchanger is positioned within the motor's housing in the area of an end face of the rotor. The cooling air stream also passes over blower vanes and at least one annular series of air circulation channels in the annular body of the stator and/or of the rotor with air streams flowing from the one end face to the other end face of the stator and/or of the rotor, so that the cooling air circuit forms an internal toroidal air stream.