US277644A - Edwaed weston - Google Patents

Description

(No Model.)

E. WESTON.

DYNAMC ELECTRIC MACHINE.

E0. 277,644. Patented May 15,1883.

NIMH

UNITED STATES PATENT OFFICE.

EDWARD rWESTON, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OF NEW YORK, N. Y.

DYNAMO-ELECTRIC MACHINE.

SPECIFl-ICATIONforrning part of Letters Patent No. 277,644, dated May 15, 1883.

(No model.)

` To all 'whom it may concern Beit kno-wnthat I, EDWARD VWnsroiv, a subject of the Queen of Great Britain, and a resident of Newark, in the county of Essex and State of New Jersey, havek invented certain new and useful Improvements in Dynamo-Electric Machines, of which thefollowing' is a specification, reference being had to the drawings accompanying and 'forming a part My invention relates to dynamo or magneto electric machines, in which the armature consists of a cylindrical core wound in a direction parallel with its axis of rotation with conduct- I 5 ors of large size.

The main object of the invention is to economize space and lreduce the internal resistance .in large machines of this character, whereby they are rendered more practicable and ef- 2o cient, particularly for running incandescent lamps, depositing metals, or similar uses which require currents of great quantity. lWhen a cylindrical armature is wound with conductors of large size, great difficulty is experienced in bending them over the ends ofthe core, while alarge mass of inert conductor is formed at the ends, which adds greatly to the bulk of the armature and increases the resistance of the armature-circuit. Another difficulty in these 3o machines results from the fact that the out side portions, or those farthest from the axis of revolution, travel at a higher rate of speed than the inner portions. Differences of potential are therefore set up, that cause what may be termed au eddying ofthe currentsin the conductors. In a patent granted to me I have shown a means of avoiding the iirst-named ohjections by using separateend connectionssuch as plates or disks-to which the longitudinal conductors are secured.

My present invention consists in the combination, with a cylindrical core, of conductors formed of separate strands of wire or thin strips, which may be more readily bent than solid wires or bars, and which may be spread out over the ends of the core, so as to add but little to the total length of the armature.

The invention is an improvement over the separate connecting-pieces, in that the num erons joints which these require are dispensed 5o with and the winding in many ways facilitated.

' The invention will he described by reference to the annexed drawings, wherel Figure l shows in central longitudinal sec tion an armature wound in accordance with my invention. Fig. 2 is an end view ofthe armature, showing the disposition ofthe coils; Fig, a view ofan insulating plate or ring used between the layers of wire. Fig. 4 is a perspective ofa portion of the armature-core on 6o a reduced scale.

The core which I employ is composed of a number of independent sections or plates, A A,.with heavier end pieces, B B, strung on a l shaft, C, and bolted together. Washers or 6 5 rings D, of metal or non-magnetic material, are interposed between the sections ofthe core to facilitate the circulation of air. The surface ofthe cylinder formed in this manner is grooved or recessed, polar projections E bein gleft, be- 7o tween which the coils are wound.

For the conductors I use a number of strands of pliant wire, which may be insulated or not.

In either event the plan of winding is substantially similar. The core is entirely covered 75 with thick paper or similar material in thin sheets, (indicated by the letter F in Fig. 4.) Strips G, of paper or similar material, are then secured in the recesses, as shown in Figs. 2 and 4, to form insulating-partitions between the coils. The strands of wire forming a conductor or coil are then laid sin glyv or in a bundle of the desired dimension in the same manner that one wire is wound in the ordinary machines, except that at theIA ends of the core the strands are spread out on either or both sides of the shaft, as shown in Fig. 2, and held in this position until the next coil is wound.

. After winding a coil over the end of the core a sheet or plate, L, of pliant insulating mate 9o rial-such as muslin, felt, or the like-is laid over the wires, and to facilitate the spreading of the wires of the next group it is heavily coated with a plastic insulating substance,

such as shellac.

The specilic method of winding and connection is not material, any of the methods which I have illustrated in patents granted to me being suitable. I prefer, however, to Wind part of the coils in pairs and part singly, beginning alternately from opposite sides ofthe same en d of the core, so thaty there will be formed an even number of convolutions in a single layer. The coils, when Wound, are connected together and to the commutator by connecting the last end of one coil and the first end of the next succeeding coil to the same commutator-scgment. This is shown in Figs. l and 2, Where H K indicate two coils or convolutions. At the end ofthe core the strands composing each coil are spread out on each side ofthe shaft O upon a circular piece oft'elt or muslin, L. The coil H is shown in dotted lines, it being under the sheet L. Of the two coils shown in Fig. 1, a and b are the beginning and end of the one and c and l the beginning and cud ofthe other, respectively. The ends b and c are brought together and joined to the same commutator-segment, lll. The remaining coils are connected in a similar manner until a complete circle ot' connections is formed. The insulating material on the armature-core, together with the strips Gand sheets L, keeps the coils from contact with the metal core and with each other, so that they are effectually insulated, Whether they be covered with fibrous material or not. By the use ot' conductors composed of numerous strands it is apparent that the masses of inert conductor at the ends ofthe core are very greatly reduced, While the resistance ofthe armature-circuit may be made very low.

XVhat I claim is- 1. rlhe combination, with an armaturecore, ot a system ot' conductors composed ot' massed strands or strips ot' conducting material, substantially as described.

2. The combination, with a cylindrical armature-core, ot' a system of conductors Wound thereon, and composed ol" groups or bundles of fine Wire, each group being spread out at the ends ot the core, as and for the purpose set forth.

3. rlhe combination, with a cylindrical armature-core, of cond uetors composed ot'groups or bundles ot' line wire wound longitudinally around the core and spread out over the ends around the shaft, and sheets ot' insulating material interposed between the groups or bundles ot' wires at the ends, substantially as set forth.

In testimony whereot'I have hereunto set my hand this 3d day ot' January, 1883.

EDWARD WESTON.

Witnesses:

RAYMOND F. BARNES, W. FnIsBY.

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