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. 17, 1996
Filed:
Sep. 15, 1994
Hans Zimmermann, Monchaltorf, CH;
ABB Management AG, Baden, CH;
Abstract
In order to cool a rotating electrical machine having an open cooling circuit, mechanically filtered environmental air is normally passed through the cooling ducts in the stator and rotor and the machine air gap (22) by means of fans (15) which are arranged on both ends of the rotor shaft. If the air which is taken from the environment is contaminated with hazardous materials, it is proposed to supply the prefiltered air directly to the stator and the machine air gap and to subject only the cooling air which is to be supplied to the rotor to refiltering in an activated charcoal filter (30). In this case, the mechanically filtered cooling air which is to be supplied to the stator and possibly the machine air gap is passed through the fans, while the refiltered cooling air which is to be supplied to the rotor is passed into the rotor on a separate route. The cooling air for the rotor is in this case preferably conveyed by the rotor's own ventilation. In this way, the investment costs for the subsequent filters are reduced while only a fraction of the required quantity of air still needs to be refiltered.