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US 5,540,969 AGranted
Insulating tape and method of producing it
AssigneeAsea Brown Boveri AG
InventorRoland Schuler
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AssigneeAsea Brown Boveri AG
InventorRoland Schuler
Estimating the term…
To improve the thermal conductivity of the main insulation of an electrical machine, an insulating tape is proposed which is composed of one or more glass-fabric layers (6) and mica layers (5). Only essentially the interspaces of the glass fabric (6) which is made up of glass threads (7) are filled with a resin (8) which is provided with a filler containing microscopically small particles (9) having a thermal conductivity which is greater than that of the resin. To protect the glass threads (7) of the fabric, its threads (7) are provided with a protective coating (10) of resin or lacquer, said protective coating (10) essentially only surrounding the threads of the glass fabric (6), but otherwise not completely filling the interspaces of the fabric. A main insulation made up of such an insulating tape fulfils all the requirements with regard to mechanical and thermal stability and electrical strength.
An insulating tape which is composed of one or more fabric layers and mica layers and in which the interspaces of the fabric, which is made up of threads, are essentially filled with a resin which is provided with a filler containing microscopically small particles having a thermal conductivity which is greater than that of the resin, wherein the threads of the fabric are provided with a protective coating of resin or lacquer, said protective coating essentially only surrounding the threads of the fabric, but otherwise not completely filling the interspaces of the fabric, and wherein the proportion of mica compared with the filler, expressed in % by weight, is greater than or at least equal to 1.
Dependencies are inferred from the claim text.