US1411619A - Electrical apparatus - Google Patents

Description

J. J. FRANK.

ELECTRICAL APPARATUS.

APPLICATION FILED oEc.10.1919.

1,41 1,61 9, Patented Apr. 4, 1922.

2 SHEETS-SHEET I.

Inventor: John JFrank byWM H i s Attorney.

J. J. FRANK.

'ELEGTRICAL APPARATUS. APPLICATION FILED 05010.1919.

1,411,619. Patented pr-4,1922.

2 SHEETS-SHEET 2.

Inventor": John JFrank,

Hi s Attorney.

TWUNITED STATES PATENT OFFICE.

JOHNJ. FRANK, OF IPI ITSFIELI), MASSACHUSETTS, ASSIGNOR TO GENERALELECTRIC COMPANY, A CORPORATIOIV OF NEW YORK.

nnnc'rnrcan insur s.

Specification of Letters Patent: Patented Apr. 4; 1922- Application filed DecemberjlO, i919. Serial 1v6(343,9e0.

, fication.

, .My invention relates to electrical apparatus, 1 and particularly to transformers, some r'eactances and the like." The object of my invention is to provide an improved ar- 3 rangementof windlngs alfordmg 1n combination better support, ventilation and magnetic balance than has been heretofore provided. v v l I; accomplishing my nvention I make use i J o'f'a'novel arrangementof supports for thelwindings and employ the novel manner ofmaking connections between parts of the windings asis hereinafter set forth more fully in detail.

For a more complete understanding. of the nature and objects of my invention ref erence should be had to the following detailed descriptiontaken in connection with the accompanying drawings in which:

Figure 1 shows in side elevation an arrangement of windings on a transformer embodying my invention. Fig. 2 is a perspective view showing a detail in the mode of connecting the windings according to my invention. Fig. 3 is a top plan view showing the arrangement for supporting the coils shown in Fig. 2. Figs. 4, 5 and 6 are views similar to Fig. 3l-showing modifications.

Referring now to the drawings, 10 represents a magnetic core whose central leg supports the winding 11, of the interleaved disccoil type.

The disc-c0ils 12 are wound on polygonal forms to give the contour shown, or they may be wound directly on the insulating cylinder 13 which surrounds the central leg of the core 10. When winding directly on the cylinder 13, the insulating devices, here shown as strips 14, which are equidistant-1y spaced about the cylindrical surface and are employed to support the coilsin proper assembly, are used in the first instance as winding forms.

It is observed that the coils 12 so assembled about the cylinder 13, bear upon and are supported tangentially between the strips 14 by the cylindrical surface. Ventilatingducts for admitting the circulation cool ng medium, as oil or air forinstance, are thus provided between the coils 12 and the cylinder 13 at each sideof strips 14.

In disc-coil ,windings designed to carry relatively large currents, it is desirable to construct the coilsso that the'turns'c'omprise a pluralitylof strands in parallel in order to'insure that'eac'h part of the turn shall carry its proper proportion of the current. Each turn in the coils 12 shown in Figs' 2 and 3 comprises four such strands indicatedrespectively at 15, '16, 17 and 18. In order, therefore, to balance the magnetic side thrust occasioned atthe point where the cross-over is brought out to 0 from one'coilto another, I have heredivided the strands into groups, groupsof twobeing shown in'Fig. 2, and bring out'such groups at 'a' plurality of symmetrically related points about the circumference ofthe coil. In Figs'fi2 andi 3 the groups are brought out at diametrically opposite points'20 and21 in the circumference of the coils. In this manner the magnetic thrusts at the crossovers on the outer circumference of the coils are balanced. The ordinary radial spacing strips for spacing the coils from each other or from insulating collars between the coils are shown at 19 in Fig. 3.

In Fig. 1 I have shown a coil of substantially similar form to that shown in Fig. 3, but instead of making the interior cross-over between coils at butone point as was indicated where the strands were shown at 15, 16, 17, 18, this inner cross-over, is likewise made in a magnetically balanced manner. Accordingly the four strands are here divided into groups at equally spaced points about the inner circumference or periphery as at 30 and 31.

In Fig. 5, I have shown a coil in which the turn in composed of six strands. This lends Similarly I have shown in Fig. 6 a coil'.

having a turn composed of eight strands, divided into four groups 50, 51, 52 and 53 which are brought out at four equidistantly spaced points in orderto balance the magnetic forces about them.

A trans-former, or like induction apparatus, when built in accordance with my invention is accordingly relieved of a great amount of side thrust upon the coils, due to the balanced arrangement for making crossovers. Mioreover the coils themselves have a very rugged support due to the tangential bearing of the turns on the inner insulating cylinder so that they are particularly able to stand side thrusts and yet have ample interior ventilating capacity. My invention is consequently specially adapted to withstand hard service where short-circuits and the like fre uently occur.

I aving now described what is at present the best means known to me for carrying out an embodiment of my invention, would have it understood that such means are merely illustrative and that I do not mean to. be limited thereby to the exact details shown nor in the choice of recognized equivalents except as defined in my claims hereunto appended.

\Vhat I claimas new and desire to secure c by Letters Patent of the United States, is

1. In an electrical apparatus, the combination with a Winding composed of stranded turns adapted to be connected in parallel, of an insulating supporting surface on which said winding bears tangentially at a plurality of points, said winding having its strands grouped and led oil at equidistantly spaced points to provide magnetically balanced cross-over connections.

2. In an electrical apparatus, a winding composed of stranded disc-coils having their strands parallel connected and grouped and led off. in equal numbers at equidistantly spaced points about the peripheries of said disc-coils to form magnetically balanced cross-over connections between coils.

8. In an electrical apparatus, the combination with a winding composed of disc-coils generally polygonal in form, of a supporting insulating cylinder, and spacing devices inserted between said coils and said cylinder at the vertices of the polygon in such Wise as to hold said coils in place and to permit the inner turn to bear tangentially upon said cylinder.

4;. In an electrical apparatus, the combination with a magnetic core, ofan insulatin cylinder surrounding a leg of the same, an stranded polygonal disccoil windings mounted about said cylinder and bearing tangentially thereupon, said windings having their strands connected in parallel, grouped and led off in equal numbers at a plurality of equidistantly spaced points about a periphery thereofto provide magnetically balanced cross-over connections.

In witness whereof, I have hereunto set my hand this 5th day of Dec., 1919.

JOHN J. FRANK.

Images