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. 09, 2002
Filed:
Jan. 07, 1999
Mark Lee Miller, Oviedo, FL (US);
Siemens Westinghouse Power Corporation, Orlando, FL (US);
Abstract
An insulating material ( ) for an electrical generator rotor and method of forming the same. An insulating substrate ( ) is formed from a single layer of woven glass fabric ( ) having a necessary thickness and coated with a thermosetting resin ( ). A first side of the substrate ( ) is adhered to a first layer of copper winding material ( ) of an electrical generator. A second side of the substrate ( ) is covered with a layer of contacting material ( ), such as plastic film, paper, treated felt or coated glass fabric, to cover the rough as-formed surface of the substrate ( ) resulting from the coating of the necessarily thick layer of fabric ( ). The contacting material ( ) provides a desired coefficient of friction to form a slip surface permitting relative movement between the first layer of copper winding material ( ) and a second layer of copper winding material ( ) disposed over the insulating material ( ). The addition of a separate contacting layer eliminates the prior art step of laminating three relatively thin layers of prepreg composite material to achieve a desired thickness and surface finish. Sanding to maintain adequate thickness control is also eliminated, thereby significantly reducing the cost of the insulating material ( ) when compared to prior art insulation.