Winding with cooling ducts

Claim 2

Electrical inductive apparatus, comprising: a tank, electrical winding means disposed in said tank, fluid-cooling means disposed in said tank, said electrical winding means including a plurality of axially spaced pancake-type coils, each having first and second major opposed outer surfaces, an opening which extends between its major surfaces, and inner and outer edges, means electrically connecting said plurality of pancake coiLs to provide at least one series path through said electrical winding means, insulating shielding means disposed about the inner and outer edges of at least certain of said pancake coils, insulating channel members having leg portions joined by a back portion, said insulating channel members being disposed about said insulated shielding means and the inner and outer edges of said pancake coils, insulating washer members disposed between said axially spaced pancake coils, and spacer means disposed between the insulating washer members and the major surfaces of adjacent pancake coils, to provide cooling ducts adjacent the major surfaces of said pancake coils, at least the leg portion of certain of said insulating channel members being stepped inwardly with spaced inward steps of a predetermined dimension, to provide inlet and outlet openings for the cooling ducts.

Claim 3

The electrical inductive apparatus of claim 1 wherein the edges of certain of the insulating washer members have a plurality of spaced inward steps therein, which are aligned with the spaced inward steps in the leg portions of the insulating channel members, to cooperatively provide inlet and outlet openings to the cooling ducts.

Claim 4

The electrical inductive apparatus of claim 1 wherein the insulated shielding means overhangs the edges of at least certain of the pancake coils by a predetermined first dimension, on each side thereof, providing a space between the leg portions of the insulating channel members and the adjacent major surfaces of their associated pancake coils, and including spacer members disposed in this space to provide support for the leg portions of the insulating channel members as well as cooling for the portion of the pancake coils disposed under the leg portions of the insulating channel members.

Claim 5

The electrical inductive apparatus of claim 1 wherein the insulated shielding means includes an electrically conductive portion having a cross-sectional configuration which is semielliptical.

Claim 6

The electrical inductive apparatus of claim 1 wherein the insulated shielding means includes an insulating core, an electrically conductive portion formed of a plurality of electrically conductive strands woven together about said core to provide a substantially smooth outer surface, and insulating means disposed about the electrically conductive portion to a predetermined build dimension.

Claim 7

The electrical inductive apparatus of claim 1 wherein the insulated shielding means is electrically connected to the adjacent turn of its associated pancake coil.

Claim 8

Electrical inductive apparatus, comprising: a tank, electrical winding means disposed in said tank, fluid-cooling means disposed in said tank, said electrical winding means including a plurality of axially spaced pancake-type coils, each having first and second major opposed outer surfaces, an opening which extends between the first and second major surfaces, and inner and outer edges, means electrically interconnecting said plurality of pancake coils, with start-start, finish-finish connections, insulating channel members having leg portions joined by a back portion, said insulating channel members being disposed about the inner and outer edges of said pancake coils, insulating washer members disposed between said axially spaced pancake coils, and contacting the adjacent insulating channel members adjacent the start-start and finish-finish connections, spacer means disposed between said insulating washer members and the major surfaces of adjacent pancake coils providing cooling ducts for said fluid-cooling means, the leg portions of certain of the insulating channel members being discontinuous, having a plurality of spaced, inward steps, the outer edges of the insulating washer member adjacent the inward steps on the leg portions of the insulating washer members also having a plurality of spaced inward steps, which are aligned with the inward steps on the insulating chaNnel member to provide entry and exit openings to the cooling ducts.

Claim 9

Electrical inductive apparatus, comprising: a tank, electrical winding means disposed in said tank, fluid-cooling means disposed in said tank, said electrical winding means including a plurality of axially spaced pancake-type coils, each having first and second major opposed outer surfaces, an opening which extends between the first and second major surfaces, and inner and outer edges, means electrically interconnecting said plurality of pancake coils, with start-start, finish-finish connections, insulating channel members having leg portions joined by a back portion, said insulating channel members being disposed about the inner and outer edges of said pancake coils, insulating washer members disposed between said axially spaced pancake coils, and contacting the adjacent insulating channel members adjacent the start-start and finish-finish connections, spacer means disposed between said insulating washer members and the major surfaces of adjacent pancake coils providing cooling ducts for said fluid-cooling means, the leg portions of certain of the insulating channel members being discontinuous, having a plurality of spaced, inward steps, the outer edges of the insulating washer member adjacent the inward steps on the leg portions of the insulating washer members also having a plurality of spaced inward steps, which are aligned with the inward steps on the insulating chaNnel member to provide entry and exit openings to the cooling ducts.

Claim 10

The electrical inductive apparatus of claim 7 including insulated shielding means disposed about the inner and outer edges of at least certain of the pancake coils, between the edges of the coils and the insulating channel members.

Claim 11

The electrical inductive apparatus of claim 8 wherein the insulated shielding means includes an electrically conductive portion formed of a plurality of electrically conductive strands woven together about an insulating core.

Claim 12

The electrical inductive apparatus of claim 8 wherein the insulated shielding means overhangs the edges of the pancake coils, providing a space between the leg portions of the insulating channel members and the adjacent major surfaces of its associated pancake coil, and including spacer means disposed in this space to provide support for the leg portions of the insulating channel members, and allow the fluid-cooling means access to the portion of the pancake coils disposed between the leg portions of the insulating channel members.