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US 4,956,626 AGranted
Inductor transformer cooling apparatus
AssigneeSundstrand Corporation
InventorsRichard J. Hoppe, Mark W. Metzler
Life of this patent
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AssigneeSundstrand Corporation
InventorsRichard J. Hoppe, Mark W. Metzler
Estimating the term…
Plate fin heat exchangers (11,12 or 34,35,36) for transformers (10) and inductors (30) made of laminated iron cores (16 and 44) and insulated wire coils (13,14,15 or 45, 46, 47, 48) placed around the legs of the cores (16 and 44) is provided in the form of a plate fin between the coils of wire. The wire coils (13,14,15 or 45,46,47,48) and respective heat exchangers (11,12 or 34,35,36) are sandwiched together with the leg of the iron core (16 or 44) passing through the sandwich. The heat generated in the coils is in direct contact with the surface of the heat exchangers (11,12 or 34,35,36). A narrow air gap (28 or 49) is incorporated in each of the plate fin heat exchangers (11,12 or 34,35,36) at the core leg of each coil (13,14,15 or 45,46,47,48) to reduce the path eddy currents can travel and thereby reduce eddy current losses which reduce the power of the transformer (10) or inductor (30).
An electrical device in the form of a transformer or an inductor, comprising a permeable core having at least one leg about which is wrapped at least one coil layer through which electric current flows to generate heat, and at least one metal, plate-shaped, plate-fin heat exchanger with lanced offset fins having a configuration through which said core passes, a liquid coolant and inlet admitting said liquid coolant into a path therein and an outlet permitting said liquid coolant heated by the coil layer to exit therefrom, wherein the heat exchanger is in contact with the at least one coil layer for directly cooling the at least one coil layer and wherein said heat exchanger includes air gaps to reduce eddy current resistance losses.
Dependencies are inferred from the claim text.