Method of making a transformer with an improved insulation syste

Details Method of making a transformer with an improved insulation syste Method of making a transformer with an improved insulation syste

1978-03-13

1979-12-25

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

264269, 264272, 336205, H01F 4112

Patent

active

041797965

ABSTRACT:
A potted transformer winding and a method of manufacturing the same are disclosed. The method of manufacture includes the steps of inserting a temporary core pin in a hollow bobbin, winding a first coil of wire on the bobbin, placing a bobbin sleeve over the bobbin, and winding a second coil of wire on the sleeve to form a transformer winding assembly. Other sleeves and coils can be provided if desired. The transformer winding assembly is located in the interior of a casing, the casing and winding are heated, the casing interior and winding are subjected to a vacuum, and a potting compound is introduced into the casing interior in continuation of the vacuum and heat. The potting compound then flows between the core pin and the bobbin to form an electrically insulative coating inside the bobbin hollow. After the casing, winding and potting compound have cooled, at least one hole is formed in the casing adjacent an end of the pin and the pin is removed from the bobbin casing. A leg of a transformer core member may then be inserted into the cylindrical space defined by the thus exposed potting compound layer.

REFERENCES:
patent: 2856639 (1958-10-01), Forrest et al.
patent: 3348302 (1967-10-01), Foerster
patent: 3559134 (1971-01-01), Daley

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