Capacitor with embossed foil electrode
First Claim
1. An electrical capacitor grade aluminum foil comprising a soft annealed aluminum foil strip having a plurality of individual curvilinear surfaced dimple-like projections and depressions from the plane of the foil, said projections and depressions being coterminous with the length and breadth of the useful foil surface in an electrical capacitor, said dimples being formed and spaced apart in a manner whereby there is a smooth essentially continuously curving foil surface leading from one dimple to an adjacent projection so that a point on the base of one dimple projection and a point on the adjacent base of a dimple depression are essentially coincident.
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Accused Products
Abstract
An improved power capacitor dielectric system utilizes the combination of electrode foils having a raised dimple pattern on their surfaces, and only polypropylene film as the dielectric, the polypropylene film having a texture pattern on one surface.
36 Citations
10 Claims
- 1. An electrical capacitor grade aluminum foil comprising a soft annealed aluminum foil strip having a plurality of individual curvilinear surfaced dimple-like projections and depressions from the plane of the foil, said projections and depressions being coterminous with the length and breadth of the useful foil surface in an electrical capacitor, said dimples being formed and spaced apart in a manner whereby there is a smooth essentially continuously curving foil surface leading from one dimple to an adjacent projection so that a point on the base of one dimple projection and a point on the adjacent base of a dimple depression are essentially coincident.
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9. In an electrical capacitor including a casing with electrical terminals thereon and one or more capacitor rolls in said casing and connected to the terminals and a dielectric fluid in the casing and impregnating the roll, the combination of
(a) said roll comprising a pair of spaced full dimple pattern metallic electrode foil strips and a dielectric therebetween consisting solely of a synthetic resin material and comprising at least one synthetic resin strip, (b) said electrode foil strips having raised closely spaced uniform dimples coterminously on the surfaces thereof to provide a compressible thickness electrode, (c) said dimples providing a foil thickness of between 2 and 10 times the original thickness before winding in said roll, (d) said dimples being formed and spaced apart in a manner whereby there is a smooth essentially continuously curving foil surface leading from one dimple to an adjacent dimple so that a point on the base of one dimple and a point on the base of an adjacent dimple are essentially coincident.
Specification