US876955A - Dynamo-electric machine. - Google Patents

Description

PATENTED JAN. 21, 1908. R. s. FEIGHT.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED 0013. 1905.

E INVENTOR ATiORNEY -UNITED STATES PATENT OFFICE.

RUSSELL S. FEICHT, OF PITTSBURG, PENNSYLVANIA, ASSIGNORTO. WESTINGETOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

DYNAMIC-ELECTRIC MACHINE.

' Specification of Letters Patent.

' Patented Jan. 21, 1008.

.Application'flled Octobea 3. 1905. Serial No. 281.187-

T 9 all whom it may concern.

Be it known that I, RUSSELL S. Fnrorrr, a

citizen of the United States, and a resident of and useful Improvement in Dynamo-Electric Machines, of which the following is a specirose to excessive values.

fication.

My invention relates to conducting end rings or similar parts, for dynamo-electric machines, and has special reference to such ring members as are adapted for use with the rotatable secondary 'members of induction motors.

The object of my invention is to provide suitable resistance Tin s for induction motors or similar machines tiat may be easily ap plied and that shall embody a'specially ventiated construction.

Squirrel-cage rotors or secondary members of induction motors are usually provided with .a plurality of conducting bars near their outer cylindrical surfaces which are connected at or near their extremities by suitable resistance conductors. In the prior art, the resistance conductors have assumed various forms, such as rings which were bolted or otherwise attached to the ends of the bars or wires which projected from the ends of the core slots, and it often occurred,

particularly in machines that were subjected to adverse conditions, such as relatively lar e slips or hi h speeds, involving considerab e secondaryosses or'the use of rings of small,

diameters, that the temperature of the rings In order to obviate this difiiculty, I have provided a ventilated end ring construction which may be used in connection with air-propellers to adequately ra'diate the heat generated and may comprise, in general, a plurality of conducting ring mem ers which are either separate units or are so interconnected by segmental webs that a large radiating surfaceis provided.

Obviously, my invention is not dependent upon a specific means for attaching the end conductors to the bars, but may embody any one of such suitable devices as may be known in the art. 1

My invention is illustrated in the accompanying drawings, in which Figure 1 is a sectional elevation of 8. or-

tion of the rotor of a dynamo-electric machine which is provided with end rings constructed in accordance with my invention.

Fig. 2 is an end elevation of a portion of the machine disclosed in Fig. 1, and Fig. 3 is a view similar to Fig. 1, of a modified form of end ring having air-propelling vanes.

Referring to the drawings, a cylindrical core portion 1 of a dynamo-electric machine is providedwith a plurality of conducting bars 2 near its outer cylindrical surface, and a p'airof similar end rings 3 to which the bars 2 are'bolted near their extremities. The end rings 3 comprise similar body portions which are divided into annular sections 5, 6 and 7 by circumferential grooves 8 and 9, the several sections being connected together by equally disposed segmental webs 10. The sections 7 of the rings 3 are rovided with annular projections 11 and extend inwardly and through which the rings are supy ported from the core b a plurality of equal disposed clamping bo ts 12% The clamping bolts 12 are rovided with'similar spacing collars 13, which are interposed between the projections 11 on the rings 7 and the end rings or plates 1 of the core 1 into which the bolts are tapped.

Referring particularly to Fig. 1, airropelling vanes 14 are bolted to the ends 0 the core frame or s ider 1 and serve to create a circulation 0 air through the' moves 8 and 9, since the core member to w iich they are attached rotates .at a relatively high speed in operation. The ring member comprising the portions 5, 6 and 7 ma be di-' end ring, in which three ring portions are independently su ported by the conducting bars to which tiey .are bolted. An air-propeller, comprising a set of vanes 15, extends or maynot be supported frominwardly from the cylindrical surface of the I ring and is attached thereto by bolts 16.

The air-propeller vanes are not. essential parts of my invention,'and it will be readily seen that many modifications in the structure and arrangement of parts may be made I without departing from the spirit of my invention, and I desire that such Variations shall be included within its scope.

I claim as my invention:

1. An end ring for dynamo-electric machines comprising a plurality of annular portions connected by segmental webs.

2. In a dynamo-electric machine, the combination with a cylindrical core member and a plurality of longitudinally-disposed conducting bars therefor, of a conducting end ring to which said bars are attached, said ring comprising a plurality of ortions connected by segmental webs, an portions having an annular flange that extends inwardly and is bolted to the core member.

3. In a dynamo-electric machine, the combination with a rotatable core member, a

plurality of conducting bars disposed in a plurality of longitudinal slots near the surone of said face thereof, and a lurality of end rings of conducting materiaf fastened to said conducting bars and separated by circumferential slots, of a set of air-propelling vanes attached to said rotatable member and locatedinside the inner walls of said ring.

4. In a dynamo-electric machine, a rotatable member comprising a plurality of conducting bars, end-connecting rings of conducting material separated by circumferential slots, and a set of air propelling vanes attached t0 said rotatable member inside the inner diameter of said rings.

In testimony whereof, I have hereunto subscribed my name this 30th day of September, 1905.

RUSSELL S. FEICHT.

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