US587764A - Wire for armature-windings - Google Patents

Description

(No Model.)

S. H. SHORT. WIRE ron ABMATURE WINDING.

Patented Aug. 10, 1897.

UNITED STATES PATENT OFFICE.

SIDNEY II. SHORT, OF CLEVELAND, OI-IIO.

WIRE FOR ARMATURE-WINDINGS.

SPECIFICATION forming part of Letters Patent No. 587,764, dated August 10, 1897.

Application filed March 19, 1896.

To all whom it mag concern.-

Be it known that I, SIDNEY H. SHORT, a citizenof the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have inventeda new and useful Impr'ovementin Wires for Armature-Windings, of which the following is a specification.

This invention relates to improvemenfs'in and in themanufacture of wires for armature-winding. i

The object of the invention is to provide a wire for use in armature-winding which will reduce eddy-currents in the armature wound thereby to a minimum and which will avoid the objection of crystallization and breakage. The invention consists substantially in the construction, arrangement, and method of operation hereinafter to be more fully described, as indicated in the accompanying drawings, and finally pointed out in the appended claims.

Referring to the accompanying drawings, Figure 1 illustrates a section of wire composed of several strands twisted into a single cable before being treated in accordance .with my invention. Fig. 3 illustrates the same after being drawn through a die and in accordance with my invention and showing an insulation applied thereto. Fig. 4 is an end view of the arrangement illustrated in Fig. 3. Fig. "5 is a view in perspective of a single cable composed of several strands twisted together, each strand being in turn composed of a number of individual strands or single wires twisted together before being treated in accordance with my invention. Fig. 6 is a similar view illustrating the cable after being treated in accordance with my invention.

In carrying out myinvention I first form a wire cable or rope A, Figs. 1 and 2, by twisting together in the usual mannera series of strands of wire of copper or other suitable material. This cable or rope is then highly compressed to an extent that causes the in dividual strands composing the cable to be crowded andpressed together and onto each other, so as to practically fill up with metal all the intervening spaces or interstices between the strands and cause plane surfaces tob'e in contact at every point. The conductor thus treated may be covered or coated Fig. 2 is an end view of the same.

Serial No. 533,953. "(1% model.)

with any suitable insulating-coverin g, and is then ready for use in winding the bobbins.

If desired,a number of cables may be twisted together in the same manner that the indi-' vidual wires are twisted together to form a single cable A, as indicated in Fig. 5, and this built-up cable is then highly compressed in the same manner as above described.

In practice it is found convenient tohighly compress the cable by drawing the me, after it is twisted, through a die, thereby reducing the size of the cable to approximately the'size of a solid wire and causing its individual strands to be crowded and crushed together so as to fill up with metal the interstices, as above described. In Fig. 6 there is shown; such a-cable after being. drawn through the die. So each cable may bedrawn through a round or flat-die toreduce it to the compressed state illustrated at B, Figs. 3 and 4, and then a series of such 'cables may be twisted together to form a single cable, and then this cable drawn through a suitable die to produce a convenient conductor, such as is indicated in Fig. 6, which is ready for use id winding armatures after being suitably coated and covered with insulation.

Haying set forth the construction and method of manufacture, I will nowdescribe the advantagesresulting from the invention. The conductor is quite flexible, because it is made up of a series of strands which may each slide upon the other to a certain extent, and, being highly compressed and the contacting-surfaces plane, a convenient way is produced by means of which each wire may slide independently of the other and with facility. This flexibilityis highly important, because it enables a conductor to be made .which is not quickly crystallized by' the jars or jolts to which it is subjected in-actual use. The conductor, notwithstanding its flexibility, has approximately the conducting-surface of a solid wire, because itis so highly compressed that the interstices between strands are filled with metal. Thus a flexible conductor is made which is cheap, durable, and eflicient. The strands of the cond uctor being twisted, so that the individual strands are first on one side of the slot in thearmature and then on the other, reduces the eddy-currents to a minimum, and the conducting-surface, as before stated, be-

ing nearly equal to a solid wire and yet having a cross-section of approximately the same diameter the conductor may be placed within the space usually allotted and without increasing the size of the slot, whereby the armature is kept at the regulation size.

Having now explained the object and nature of my invention and the advantages resulting therefrom, I will now claim the novel features thereof:

1. A conductor for use in winding armatures and similar appliances com prising a plu- Y rality of wires the adjacent contact-surfaces of which conform in cross-section to the interstices between such wires and thereby fill such interstices; substantially as and for the purpose set forth.

2. A conductor for use in winding armatures and the like composed of more than two wires twisted together and having plane surfaces in contact at every point; substantially as and for the purpose set forth.

3. A conductor for use in winding armatures and the like, composed of a plurality of strands twisted together, having plane surfaces in contact, and each strand composed of more than two wires twisted togetherand having plane surfaces in contact at every point; snbstantiallyas and for the purpose set forth.

In witness whereof I have hereunto set my hand this 16th day of March, 1896.

SIDNEY ll. SHORT.

Witnesses:

FRANK '1. Snows.

I-I. DARBY.

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