Method of manufacturing a strip wound coil to eliminate lead bul

Details Method of manufacturing a strip wound coil to eliminate lead bul Method of manufacturing a strip wound coil to eliminate lead bul

1993-03-17

1993-12-07

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29609, 336 6, 336192, H01F 4106

Patent

active

052673936

ABSTRACT:
A dry type transformer has an iron core, high voltage windings embedded in cast resin, and low voltage windings resin encapsulated. The low voltage winding is constructed with flexible sheet conductors. Insulating material includes a means to secure the windings in place during a vacuum and pressure resin impregnation process. A unique cylinder or mandril provides a flat surface for one of the low voltage external leads to rest on during the start of the coil winding process. Cooling duct sizes and locations in the windings are varied during winding. The result is a finished coil that maintains an essentially cylindrical shape.

REFERENCES:
patent: 4039990 (1977-08-01), Philp
patent: 4488134 (1984-12-01), Pfeiffer
patent: 4496926 (1985-01-01), Kubo et al.
patent: 4649640 (1987-03-01), Ito et al.
patent: 4663604 (1987-05-01), Van Schaick et al.
patent: 5036580 (1991-08-01), Fox et al.

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