Method of making a molded transformer enclosure

Details Method of making a molded transformer enclosure Method of making a molded transformer enclosure

1989-12-19

1991-10-15

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

26427215, 26427219, 336 96, H01F 706

Patent

active

050562142

ABSTRACT:
A method of making an insulating enclosure (114) for a low resistance welding transformer (110) comprises assembling primary (116) and secondary (118) coils and a steel core (120) into a conventional inductive subassembly (112) having primary (122) and secondary (124) coil leads; placing the subassembly (112) into a mold (140) having stubs (164) projecting inwardly of the mold (140) in predisposed positions; and filling the mold (140) with an epoxy resin to sealingly encapsulate the subassembly (112) and provide premolded apertures (136) through the resulting enclosure (114). The epoxy resin includes equal parts of a nonfoaming, thermal-set epoxy and an aluminum oxide filler.

REFERENCES:
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patent: 4225839 (1980-09-01), Martincic
patent: 4333900 (1982-06-01), Carey
patent: 4460883 (1984-07-01), Van Der Hoek et al.
patent: 4586016 (1986-04-01), Rilly et al.
patent: 4745677 (1988-05-01), Shichi
patent: 4763095 (1988-08-01), Bradt

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