Electrical winding

Feb. 14, 1950

G. H. PHELPS

2,497,516

ELECTRICAL WINDING

Filed April 22, 1944

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/^ATTORNEY

Patented Feb. 14, 1950

2,497,516

UNITED STATES PATENT OFFICE

2,497,516

ELECTRICAL WINDING

George H. Phelps, Floral Park, N. Y., assignor to Metropolitan Engineering Company, Brooklyn, N. Y., a corporation of New York

Application April 22,1944, Serial No. 532,295

Claims. (Cl

The invention herein disclosed relates to an electrically conductive winding that is particularly suitable for carrying very heavy currents.

In certain instances, electrical windings are required to carry very heavy currents. It is es- 5 sential that the heat generated be dissipated rapidly to avoid injury to the winding. An example of such a winding is the primary of a transformer for a welder of the kind in which the weld is effected by the electric resistance IQ method. In such machines, the metal pieces to be welded are heated by the passage of a very heavy electric current through the pieces. This heavy electric current is supplied from a transformer, and unless some provision be made for dissipat- ¹⁵ing the heat generated in the winding of the transformer, the transformer has a relatively short life.

By this invention there is provided an electrically conductive winding in which the heat is 20 extracted by a cooling fluid flowing through the winding. In accordance with the invention, the coil comprises a wound conductor which essentially includes three parts or elements. Two of the elements are electrically conductive solid 25 copper elements of like cross section. Each of these elements has a substantially semi-cylindrical groove or depression therein running longitudinally thereof. The third element consists of a tube, preferably a metallic, copper tube situated 30 between the solid electrically conductive elements in heat transfer relation therewith. The tube is adapted for carrying a cooling fluid and suitable connections are provided for delivering the fluid at one end of the tube and discharging the fluid 35 from the other end of the tube.

A winding embodying this invention is illustrated in the accompanying drawing as an example of one specific embodiment and it is described in detail below from which description a id clearer understanding of the invention may be had.

The drawings include:

Fig. 1 which is an isometric view of a winding embodying the invention; and 45

Pig. 2 which is a fragmentary, transverse section of the same taken on the line 2—2 of Fig. 1.

The winding illustrated in the drawing consists of two coils I and 2, one within the other with an air space therebetween. At one end, the 50 coils are electrically connected together by a connector 3. At the other end of the winding, the end 4 of the inner coil is connected to a line terminal 5, and the end 8 of the coil 2 is connected to a line terminal 7. 55

175—356)

Each coil comprises a pair of conductors. The outer coil includes the conductors 8 and 9, and the inner coil consists of the conductors 10 and I ί. The several conductors are identical in construction and the two coils, except for the size, are likewise identical in construction. The conductoi- 8 includes two copper elements 12 and 13 which are of like cross sections. These elements are preferably rolled to shape. The element 12 is rectangular in cross section and has a substantially semi-cylindrical groove or depression !4 in one face thereof running longitudinally thereof from end to end. The element 13 is likewise rectangular in cross-section and has a substantially semi-cylindrical depression 15 in one face thereof, the face opposite to the one of the element 13 having the depression 14 therein. Between the elements and within the depressions !4 and 15, there is a copper tube 16. This tube extends through the entire conductor and beyond the ends thereof.

As illustrated in the drawings, the depressions 14 and 15 in the conductors 12 and (3 are, in cross-section, arcs of circles. The radius of these depressions is the same as the radius of the outside diameter of the tube 1'6. However, the depressions are, in cross-section, less than a semi-circle so that when the assembly is drawn together the adjacent faces of the elements 12 and 13 do not meet and an intimate surface contact is effected between' the. elements and the tube which provides a good heat transfer relation. On being bent, in winding the coil, this intimate contact is maintained as even with the deformation of the tube in bending the conductor as at 17, the adjacent faces of the elements 12 and (3 just about come together at the bend.

Between the conductors 8 and 9 which make up the coil 2, there is placed a fiat fibre strip 18. With this strip between the conductors, insulation 19 is wound, tightly, about the conductors. The insulation serves to insulate the conductors and to secure the elements of the conductors together as well as securing the two conductors together. So constructed, the two conductors 8 and 9 constitute the coil 2, and the conductors 10 and (I which are identical in construction, constitute the coil I.

The tube 16 of the conductor 8 has an e,nd section 20 extending beyond one end of the conductor. A like end section 22, of the tube 23 of the conductor 9 extends from the corresponding end of the conductor 9. These end sections of the tubes are connected to a manifold 24. Like end sections 25 and 26 of the tubes in the conductors

3,497,516 ί 0 and ! I respectively are also connected to the manifold 24. The manifold is supplied with water through an inlet connection 27 which is connected with a water supply through a rubber tube.

At the opposite end of the winding 2, end sections 28 and 29 of the tubes 16 and 23 respectively extend beyond the conductors 8 and 9 and beyond the line terminal 7. These end sectibns are connected to a discharge manifold 30 to which there is also connected a water outlet tube 31 that is preferably connected to a drain by a rubber tube. Like end sections 31 and 32 of the tubes within the conductors 10 and 11 extend beyond the conductors and the line terminal 5. These end sections are connected to a discharge manifold 33. This manifold is separated from the manifold 30 and it has a separate water outlet tube 35 that is connected to the drain through a rubber tube.

From the foregoing description of the embodiment of the invention disclosed in the drawing, it will be seen that by this invention there is provided a winding and coil that is suitable for carying heavy currents; that is cooled by a fluid flowing therethrough in intimate heat transfer relation with the conductor; that is constructed such that it is readily assembled; sturdy, reliable in function, and suitable for long service.

It will be obvious that various changes may be made by those skilled in the art in the details of the embodiment of the invention illustrated in the drawings and described in detail above within the principle and scope of the invention as expressed in the appended claims.