US540323A - And charles a - Google Patents

Description

(No Model.)

0. P. LOOMIS 8: G. A. PIERCE.

ELECTROMAGNETIC WINDING.

No. 540,323. Patented June 4, 1895.

WITNESSES: INV NTORS.

[ 4 J J /l ATTORNEYS.

UNITED STATES PATENT OFFICE.

OSBORN P. LOOMIS, OF BOUND BROOK, NEIV JERSEY, AND CHARLES A. PIERCE, OF LYNN, MASSACHUSETTS.

ELECTROMAGNETIC WINDING.

SPECIFICATION forming part of Letters Patent No. 540,323, dated June 4, 1895. Application filed March 9, 1895- Serial No. 541,115. (No model.)

To all whom it may concern:

Be it known that we, OSBORN P. Looms, residing at Bound Brook, Somerset county, and State of New Jersey, and CHARLES A. PIERCE, residing at Lynn, Essex county, and State of Massachusetts, citizens of the United States, have invented certain new and useful Improvements in Electromagnetic Windings, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

In the use of cylindrical wire for windings or coils of electro-magnets it is, of course, impossible to avoid wasting a certain amount of space by reason of the cross-sectional shape of the wire, and the larger the diameter of the wire the greater will be the interstitial spaces and accordingly the greater the waste of space. This is especially true in the case of windings of compound coils of dynamo electric machines, where it is necessary to have the cross-section of the conductor as great as possible in order to keep down resistance and thereby prevent excessive loss in energy in regulation. here coarse wire is used, it is very troublesome to wind and moreover causes a great deal of waste space, thereby necessitating a much larger coil, and in building dynamos it is quite often desirable to have this coil take up as little room as possible. For this reason it has been known that it would be a desirable thing to be able to wind copper strips on edge, but such a thing is a practical impossibility where the tape or strip is a continuous and integral piece. By our invention we provide ametallic tape that can be wound in turns or coils of any desired shape and'there is practically no Waste space whatever.

WVe have illustrated types of our invention in the accompanying drawings, wherein- Figure 1 is a perspective view of one of our rectangular-shaped windings, the turns of which are opened or spread out in order to show more clearly its construction. In this view the layer of insulating material or paper for insulating the juxtaposed turns of the windin g is omitted for the sake of clearness.

Fig. 2 is an edge view of the rectangular coil shown in Fig. l with the interposed layers of paper for insulating the turns of the winding, which are closed flatly upon each other in the manner in which it is used. Fig. 3 is a perspective View of one of our spiral windings or coils. Fig. am a diagrammatic view here inafter referred to.

Referring to the drawings, in which like numbers of reference indicate like parts throughout, 2 is a sectional metallic tape of copper for instance, composed of sets of metallic strips 3 and 4 secured flatly together with their fiat sides in intimate contact and with their en dsnon-coincident so that the end 5 of one stripmay project beyond and overhang the adjacent end 6, of its juxtaposed strip and each of the overhanging ends 5 of one set may form a smooth overlapping joint with the overhanging ends 5, of the contiguous set of strips, as clearly indicated in the drawings.

In Figs. 1 and 2, the winding shown is of a rectangular form in plan view, and the sets of strips are electrically connected with each other at right angles so that the end 6 of the strip of one set makes contact with the side edges of the overhanging end 5 of the nextset of strips, on a line indicated at '7, Fig. 1. As the total cross-section of the strips composing each set is substantially the same, the outer fiat faces of contiguous sets are in the same plane thereby forming a practically continuous and unbroken surface which presents no uneven seams or joints.

In Fig. 3 we have shown a spiral coil orhelix in which the strips 3 andt composing the sets of each section of the metallic tape, are semi-circular shaped pieces of metal, such as copper, placed flatly together with their ends non-coincident and forming a smooth lap joint-the ends of the respective strips of the connected sets coming together end to end upon lines indicated at S and 9, in said figure. If preferred, the winding maybe made in a form that is elliptical in plan instead of circular or rectangular as herewith shown, though the particular shape of the turns of the winding is a matter that may be varied to suit the particular conditions that may arise.

Between the turns of the windings is arranged a layer of suitable insulating, material 10, such, for instance, as paper, in order to completely insulate each turn from the other. When now the sectional tape is formed into the desired winding and the turns are properly insulated from each other the coil or winding is pressed together so as to bring the turns and the insulating layer 10, flatly against each other, as shown in Figs. 2 and 3, and it will be observed that under such conditions there is no waste space whatsoever. Thus the practical effect is that of a continuous metallic tape wound on edge.

The strips of each set forming a section are practically of the same length, that is to say, where a section is composed of two strips such as 3 and 4, each of said two strips is of practically the same length. However, this is a matter of preference, as each set maybe composed of a short and a long strip, the latter of which provides the overhanging ends, as shown in a diagrammatic view in Fig. 4.

While each of the strips is shown as of the same cross-sectional area it will be noted that this construction need not be adhered to in carrying out the invention, for one strip of a set may be thicker than its juxtaposed one, in which case precaution must be taken to have the thicker strip overlap the thinner one, in order to make the composite strip of practically uniform thickness at the joint as well as throughout the body thereof.

In practice we solder the strips together at the overlapping ends, but they may be united in any well known way which will serve to join the sections securely together and at the same time keep the juxtaposed strips in close contact. g

It will be noted that in our improved winding the joints are formed simply by overlapping the ends of the strips which do not have to be cut or in any way peculiarly formed for the purpose of such joints. By virtue of this simple construction the winding may be manufactured very cheaply.

When the coil or winding is made upin the manner described with its layer of insulating material interposed between the turns thereof, as shown in Figs. 2 and 3, it is wrapped in cloth in the usual manner in order to complete it and it is then ready to be placed on the dynamo magnet. This described winding makes one of veryv low resistance and it possesses great radiating properties so that it readily dissipates what little energy there may be produced in it.

The coil, or winding can be made of any capacitythat may be desired and its sections may be composed of any desired number of strips though we have shown the use of but two, each of which is one-half the cross-sectional area required.

We desire to be understood as not limiting ourselves to the specific constructions herewith shown, as the same may be modified without departing from the spirit of the invention.

Having thus-described our invention, what we claim, and desire to secure by Letters Patent, is-

1. A winding or coil for an electro-magnet comprising a sectional tape composed of sets of strips of metal, the strips of each set being placed flatly together with the ends of adjacent strips non-coincident and overhanging, said sets of strips being connected together at the overhanging ends and forming smooth lap-joints with each other, substantially as and for the purpose set forth.

2. A winding or coil for an electro-magnet comprising a tape composed of sets of strips of metal arranged end to end, the strips of each set being of practically uniform dimensions and placed flatly together with the ends non-coincident so that one end of the strip projects beyond the adjacent end of its juxtaposed strip and the projecting ends of the sets of strips form smooth lap-joints with each other, substantially as and for the purpose set forth.

comprising a sectional tape composed of sets of strips of metal,the strips of each set being placed flatly together, said sets of strips being connected together at Tthe overhanging ends and forming smooth lap-j oints with each other and wound on edge, substantially as and for the purpose set forth.

4. A winding or coil for an electro-magnet comprising a sectional tape composed of sets of strips of metal, such as 3 and 4, placed flatly together with their respective ends 5 and 6, non-coincident and joined together so as to form smooth overlapping joints,substantially as and for the purpose set forth.

In testimony whereof We have hereunto set our hands, this 7th day of March, 1895, in the presence of the two subscribing witnesses.

OSBORN P. LOOHIS. CHAS. A. PIERCE. Witnesses:

JOHN L. HALYBURTON, E. O. KNAPP.

3. A winding or coil for an electro-magnet a

Images