US1227314A - Transformer. - Google Patents

Description

E. G. REED.

TRANSFORMER.

APPLICATION FILED NOV. 5, 1913.

1,227,314. Patented May 22, 1917.

WITNESSES: INVENTOR 5 aw g4m ATTORNEY UNITED STATES PATENT OFFICE.

; EMERSON G. REED, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR T WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A. CORPORATION OF PENNSYLVANIA.

TRANSFORMER.

' To all whom it may concern Be it known that I, EMERsoN G. Reno, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Transformers, of which the following is a spec1fic at1on.

My invention relates to stationary nductive apparatus, and it has for its ob]ect to provide an improved transformer structure which will insure adequate cooling for the transformer coils, and, at the same time,

will require a minimum amount of activecomprised a plurality of magnetizable circuits preferably made of laminated iron,

each of which embraced the oil duct or ducts surrounding the inner coils. Asa result, a large quantity of active material was employed in the core structure whlch was not essential for either magnetic or electrical reasons and which added materially to the weight and the cost of the transformer.

In my transformer, I propose to provlde oil 'ducts between the several coils which will be so positioned that the magnetic ,circuits employing the greater quantity of active material, such as iron, will not. embrace the aforementioned, ducts. With my type of construction, adequate cooling of the transformer coils is assured, while a material saving in the amount of laminated iron is effected. In order to disclose my invention more fully, reference may be had to the following description and the accompanying drawing in which Figure 1 is a sectional plan view, and Fig. 2 is a view, in e1evat1on, of an assembled transformer core and winding which embodies a form of my invention.

Referring to the drawings, the structure illustrated comprises a plurality of core Specification of Letters Patent.

members 1, 2, 3 and ,4 whichembrace coils 5 and 6. The core members 1 and 3 are alike as are also the core members 2 and 4. Each of the members 1 and 3 is provided with an inside portion 7 the cross sectional area of which is materially less than those of the outer side and ends. Side portions 8 are expanded by meansof interleaved laminations in order to increase the cross sectional areas of the magnetic circuits exte riorly of the coils 5 and 6. The two inner side portions? of the core members 1 and 3 abut against each other, and two corresponding side portions 9 of the core members 2 and 4 abut against the sides of the first mentioned portions,.- substantially as shown in Fig. 1. By thus grouping the core portions 7 and 9,'a maximum amount of iron may be embraced by a minimum mean length of turn in the coils 5 and 6, thereby reducing the cost of the transformer.

The coil 6 is surrounded by the coil 5 which fits closely thereto along the sides embraced by the core members 1 and 3. Interposed between the adjacent surfaces of the sides of the coils embraced by the core members 4 and 2, are oil ducts 10."

Inasmuch as the core members 1 and 3 which contain the greater portion of the active magnetizable material, preferablylaminated iron, do not embrace any air ducts, a material saving in the total amount of iron is effected. At the same time, adequate cooling facilities for the coils 5 and 6 are provided by the air ducts 10 which are embraced by the core members 2 and 4.

The quantity of active material comprised in the core members 2 and 4 is much smaller than that comprised in the core members 1 and3, and, therefore, the material wasted by providing the ducts 10 is negligible, as compared with the old form of construction, as previously explained, although the width of the said ducts may be substantially increased. I have found that very satisfactory operating results may be ob- Patented May 22, 1917.

Application filed November 5, 1913. Serial No. 799,274.

members, the relatively narrow members embracing the said coils and ducts, and the relatively wide members embracing the coils only.

2. In a shell-type transformer, the combination with a nest of substantially rectangular coils provided with ventilating ducts extending along the shorter sides only thereof, of a core comprising relatively narrowand relatively Wide members, the relatively narrow members embracing the said ducts and the shorter sides of the coils, and the relatively wide members embracing the longer sides only of the coils.

3. In ashell-type transformer, the combination with a plurality of nested coils having spaced ventilating ducts positioned intermediate thereof, of a core comprising a plurality of unlike members, the. larger ones of which embrace unspaced portions only of the said coils.

4. In a shell-type transformer, the combination with a plurality of substantially rectangularcoils which are nested and provided with spaced ventilating ducts intermediate two opposite sides thereof, of a core comprising a plurality of relatively narrow and relatively wide members, the relatively narrow members embracing the coils and ventilating ducts, and the relatively wide members embracing only the coils.

5. In a shell-type transformer, the. combination with a nest of substantially rectangular coils provided with ventilating ducts extending along the shorter sides only thereof, of a corecomprising unlike members some of which embrace the shorter sides of said coils and ducts, and others of which embrace the longer sides of said coils only.

, 6'. In a cruciform-type transformer, the combination with a nest of coils which are in intimate contact with one another on EMERSON G. REED.

Witnesses:

J. B. GIBBs,

B. B. HINES.

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