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:
Feb. 20, 2001
Filed:
Sep. 27, 1999
Ernst Zysset, Macolin, CH;
The Swatch Group Management Services AG, Biel, CH;
Abstract
In order to assure efficient cooling and a temperature balance between the stator and the rotor, an asynchronous electric motor is provided containing a closed cooling liquid circuit which passes successively into the stator (,) and into the shaft (,) of the rotor, over the entire length of the stator and the rotor. A pump (,) is incorporated in the rotor shaft. The liquid is injected into the pump by a stationary axial tube (,) and comes out again between the shaft and this tube. The pump includes a centrifugal pumping member (,) fixed to the bottom of the bore of the shaft, and longitudinal-blades (,) fixed to the shaft facing an external helicoid rib (,) of the injection tube. The liquid is cooled by the ambient air along the periphery of the stator.