Dial wound capacitor and method of making same

Details Dial wound capacitor and method of making same Dial wound capacitor and method of making same

1979-06-25

1981-04-21

Goldberg, E. A.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

29 2542, 361304, 361308, 361323, 361330, H01G 438

Patent

active

042636388

ABSTRACT:
A dual wound capacitor is provided in which two capacitors with a common electrode are provided or two separate capacitors are provided in a single winding operation. First and second metallized dielectric films are wound through a predetermined number of turns to a position preceding a gap in at least one of the metallized sides of the film. The gap is formed by removing or omitting metal from an intermediate portion on the dielectric film either before the capacitor is wound or during the winding process. The gap so formed may be as narrow as an eighth of an inch and, under any circumstance, is substantially less than the length of one winding of the capacitor. An insulated sheet having a length sufficient to encircle the gap is inserted and wound between first and second metallized dielectric films and extends outwardly from one side of the capacitor to form an overlapping circular barrier which separates the metallized portions on each side of the gap. The winding is then completed and the extreme outwardly extending, overlapping edges of the barrier are fused to enclose the gap. Ends of the capacitor are then metal coated and electrical connections are provided to both sides of the barrier and to the other end of the capacitor. The barrier prevents the bridging of the gap when the capacitor is coated. As an alternative, using a wider barrier and spraying at an angle can also be used to prevent the shorting of the gap.
To make two separate capacitors in a single winding, gaps are provided in both metallized films and the insulating sheet encircles both gaps and extends outwardly on both ends of the capacitor which are then coated and electrical connections are made to both sides of the barrier on each end of the capacitor.

REFERENCES:
patent: 1633576 (1927-06-01), Franks
patent: 2735970 (1956-02-01), Peck
patent: 3434024 (1969-03-01), Vialina
patent: 3921041 (1975-11-01), Stockman
patent: 4028595 (1977-06-01), Stockman

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