US1261126A - Dynamo-electric machine. - Google Patents

Description

R. E. HELLMUND.

DYNAMO ELECTRIC MACHINE,

APPLICATION man APR. l.' |915.

1 26 1, 1 26.. Patented Apr. 2, 1918.

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RUDOLF E. HELLIUNILOF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented Apr. 2, 1918.

Application led April 1, 1915. Serial No. 18,507.

To all whom 'it may concern:

Be it known that I, RUDOLF E. HELL- MUND, a subject of the Emperor of Germany, and a resident of Pittsbur h, in the county of Allegheny and State o Pennsylvania, have invented a new and useful Improvement in Dynamo-Electric Machines,

` of which the following is-a specification.

duct.

My invention relates to magnetizable core members for dynamo-electric machines and it has particular reference to machines provided with longitudinal ventilating ducts.

In Va copending application, Serial No. 15,800, fledMarch 20, 1915, by R. E. Hellmund and J. V. Dobson and assigned to the Westinghouse Electric & Manufacturing Company, is described a system of ventilation for dynamo-electric machines in which the cooling medium enters the machine at each end and is expelled from a central duct. In this construction, the magnetizable core members are built up in separate sections between end members and are secured together by suitable means.

The object of my invention is to provide means whereby a portion of the cooling medium ma be passed through the core members an expelled directly into the surrounding atmosphere without passing into the central d uct embodied in the above-de scribed machine.

By the use of my invention in connection with machines of this type, the central duct may be reduced in width, thereby limiting the amount of inactive copper brldging the ducts, as well as decreasing the copper losses. It will also be vpossible to obtain greater mechanical strength for the core structure, as a whole, for the reason that the number of Ventilating openings in the end plates is materially reduced. In the latter case, more metal is available in the end members to give the required rigidit to the structure than would be the case i all of the axial ventilatinglducts opened into the central Furthermore, my invention is particularl applicable to machines designed for rai way service wherein it is yessential to obtain eective ventilation without increasing the length of the machines. It is to be understood, however, that my invention may be readily applied to dynamo-electric machines of any type.

of the magnetizable core member of a dynamo-electric machine embodying my invention; Figs. 2, 3 and 4 are fragmentary views, respectively, of the several types of sheet-metal punchings employed in constructing the core member shown in Fig. 1.

Groups of sheet- metal punchings 1, 2 and 3 are assembled between suitable end members 4 to form separate half portions of a magnetizable core member. The half portions are spaced apart to form a central duct 5 and are secured together by any suitable means, such as lugs 6 carried by the end members 4 and bolts 7. The sheet-metal ` plates 1, 2 and 3 are annular in form and are provided, adjacent to their outer peripheries, with a plurality of regularly spaced rivet holes 8. The plates 1 are further provided with a plurality of openings 9, preferably circular in form and arranged in staggered relation to the openings 8, and the plates 2 are provided with a plurality of substantially U-shaped slots 10 opening into the outer peripheries of the plates and so arranged that the bottom portions of the slots 10 are adapted to register with the openings 9 in the lates l, when the plates 1 and 2 are assemb ed. The plates 1, 2 and 3 are provided with additional openings 11 which are regularly spaced with respect to each other. When the plates are assembled, the rivet holes 8 are in alinement and are adapted to receive suitable rivets 12 by means of which the plates are secured between the end members 4. The circular openings 9 are also in alinement and register with the bottom portions of the slots 10 to form a plurality of continuous longitudinal and radial ducts 13 by means of which a cooling medium may be forced from the outside of the machine through the openings 13n provided in the plate member 4 and expelled directly into the surrounding atmosphere. The additional openings 11 are also in alinement and form a plurality of longitudinal ducts 14 which open into the central ventilatin duct.5 by means of openings 15 provided 1n the end members 4.

From the foregoing, it is apparent that, although a large proportion of the cooling medium will be forced through the longitudinal ducts 14 and into the central duct 5 between the end members 4, the portion of the cooling medium which traverses the core member adjacent to its outer periphery will is qulte evident that the dimensions of the.

4 central duct may be reduced, and, if so desired, may be entirely dispensed with. In addition, the' end members will not be weakened by providing additional openings in order to furnish an outlet for the circular openings 9 in the plates 1.

While I. have shown my invention in a simple and preferred form, it is'not so limited but may be applied to dynamo-electric machines other than of the type illustrated and I desire that only such limitations shall be imposed thereon as come within the scope of the appended claims.

I claim as my invention:

1. An annular magnetizable core member for dynamo-electric machines provided with a plurality of longitudinal ducts extending therethrough and a plurality of continuous longitudinal and radial ducts extending partially through said member.

2. An annular magnetizable core member for dynamo-electric machines provided with a plurality of longitudinal ducts extending therethrough vand a plurality of substantially L-shaped ducts.

3. An annular magnetizable core member for dynamo-electric machines provided with a plurality of longitudinal ducts extending from end to end and a plurality of continuous longitudinal and radial ducts extending from one end to the outer periphery of said member.

4. An annular 'magnetizable core member for dynamo-electric machines comprising a plurality of plates and end members secured together, longitudinal ducts extending through said plates and end members and other ducts extending only through one of said end members and through a portion of said plates.

5. An annular magnetizable core member for dynamo-electric machines comprising a plurality of plates and end members secured together, longitudinal ducts extending through said plates and end members and other continuous longitudinal and radial ducts extending through one of said end members and through a portion of said plates.

6. An annular magnetizable core memberV for dynamoelectric machines comprising a plurality of plates and end members secured together, longitudinal ducts extending through said platesf and end members and other ducts extending through one of said plate members to the outer periphery of said core member.

7 An annular magnetizable core member for dynamo-electricmachines comprising a plurality of plates provided with longitudinal ducts, end members provided with openings registerin with only a portion of said longitudinal ucts, and radial ducts provided in said plates communicating with the remainder of said longitudinal ducts.

'8. An annular magnetizable core member for dynamo-electric machines comprising a plurality of plates provided with longitudinal ducts, an end member provided with openings registering with all of said longitudinal ducts, a second end member provided with openings registering with only a portion of said longitudinal ducts, and radial ducts provided in said plates and communicating with the remainder of said ducts.

In testimony whereof I have hereunto subscribed my name this 29th day of March,

RUDOLF E. HELLMUND.

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