US2454180A - Frame structure of dynamoelectric machines - Google Patents

Description

Nov. 16, 1948. F. J. JOHNS FRAME-STRUCTURES OF DYNAMOELECTRIC MACHINES Filed Aug. 28, 1947 INVENTOR Jljkk ATTORNEY Francis JJd/Ins.

Patented Nov. 16, 1948 UNITED STATES PATENT DFFICE FRAME STRUCTURE OF DYNAMOELECTRIC MACHINES Application August 28, 1947, Serial No. 771,015

20 Claims.

My invention relates to a novel structural assembly for the stator-members of large squirrelcage motors or other dynamo-electric machines, in which various advantages are combined.

An object of my invention is to provide a stator member construction in which an annular ventilating-space is economically provided, in which air-obstructions are minimized, weight is reduced, and strength is maintained.

With the foregoing and other objects in view, my invention consists in the machines, constructions, combinations, parts and methods of assembly and operation, as subsequently described and claimed, and illustrated in the accompanying drawing, wherein:

Figure 1 is a longitudinal sectional view or a EGO-horsepower, 4 pole, to cycle, polyphase squirrel-cage motor, embodying my invention bl] way of illustration, the section-plane being indicated at I-I in Fig. 2; and

Fig. 2 is a transverse sectional view of the machine, the plane being indicated by the line II-II in Fig. l. 4

My invention is particularly applicable, as shown, to a horizontal-shaft machine having double-end ventilation, that is, a machine in which the ventilating-air is drawn into the machine from both ends thereof, and is discharged laterally of the machine, as will be subsequently described.

The illustrated machine essentially has a stator-member 3 and a rotor-member B, the latter being mounted on a horizontal shaft o. The stator-member 3 comprises a stack of annular stator-punchings 6 having a substantially cylindrical outer periphery l, and having a bore 3 which defines an air gap surrounding the rotormember' l: Stator-windings 9 are carried by the stator-punchings 6, near the bore thereof.

In accordance with my invention, the outer periphery l of the stator-punchings 6 is engaged by a plurality of radially thick punching-holding frame-bars H, H and i3, as shown in Fig. 2. These frame-bars extend axially across the outer periphery of the stack of stator-punchings, and they also extend beyond both ends of the stack, as shown at M in Fig. l. The radial thickness of these punching-holding frame-bars ll, l2 and i3 is equal to the radial thickness of the annular ventilating-space H which is to be provided around the outer periphery of the stator-punchings, as will be subsequently described.

Since these radially thick punching-holding frame-bars ll, 12 and I3 close the annular ventilating-space l against any circumferential movement of air past any one of said bars, it is quite desirable that the number of these radially thick frame-bars should be limited to a small number, such as two or three, or possibly four. Since it is desirable that outlet-openings it shall be provided, along each side of the stator-frame, below the center-line ll of the stator-member, it is desirable that one of these radially-thick frame-bars, such as the bar ll, shall be placed at the top of the stator-punchings 6, where no circumferential air-flow is needed; and it is further essential that no other radially thick framebar shall be provided above a point which is below the level of the outlet-opening it which discharges air from the top portion of the machine, along each side of the machine. Thus, in the lilustrated construction, as shown in Fig. 2, the radially-thick frame-bars H and i2, which are not at the top of the machine, are disposed at points which are partway up on the underside of the stator-punchings i, that is, below the center-line ll of the stator punchings.

The disposition of one of the frame-bars it at the top center of the machine is advantageous in providing an anchorage for two lifting-rings i8, which are provided for the motor. This top frame-bar it is thus advantageously a solid bar of approximately square or rectangular shape. The other two radially-thick frame-bars H and it need not be solid, but may advantageously be Each end-bracket 2i has a bearing-member 22 for supporting the rotor-shaft 5, and has also one or more inlet-openings 23 for ventilating-air. On the inside, each end-bracket 2! is also provided with baiile-means 24, for cooperating with rotormember fan-means which are provided in the form of blower-blades 25 which are cast integrally with the squirrel-cage winding 26 of the rotor-member 4, these blower-blades 25 being provided at each end of the rotor-member.

Each of the annular frame-rings 20 has a substantially annular outer periphery 27 which is substantially flush with the outer surfaces of the thick frame-bars ll, l2 and I3. A sheet-like top enclosure-member 28 is provided, which extends over the top frame-bar II, and the top portions of the two frame-rings 20, for defining an upper annular ventilating-space l5U, between said top enclosure-member 28 and the periphery 1 of the stator-punchlngs 6. A sheet-like bottom enclosure-member ie is also provided, which ex= closure-members 28 and 29 respectively, as shown in Fig. 2, the air-flow being indicated by the arrows. In the illustrated iorm of embodiment of my invention, these two outlet-openings it and 30 are in the vicinity of the lowermost thick. frame-bars I2 and it, respectively, the outletopemngs it being above the bars 822 and iii, while the outlet-openings lit are below the same. The advantage of providing the upper outlet-=opening is below the center-line ll of the machine is that it can discharge its air downwardly so that the machine will be drip-proof.

Since the upper and lower enclosure-members 28 and 29 do not take any substantial part of the weight of the statcr member, they may be of relatively light plates, in a fabricated construction. Nevertheless, with respect to the rigidity of the complete stator-assembly, these top and bot tom enclosure- plates 23 and 29 contribute considerable rigidity to the entire assembly.

It is desirable that there shall be at least one radially thick, axially extending frame-bar ii, placed at the top of the machine, and in general, it is desirable that there shall be no other radially thick bars around the top half of the statorpunchings, or until a point is reached which is considerably below the center-line l7 as indicated by the positions of the bars 02 and ii} in Fig. 2, In generalit is desirable, from considerations of structural rigidity, to have one or more radially thick axially extending framebars, such as IE or ill, located somewhere along the lower portion of the stator-punohings, but preferably not at any point between the illustrated positions of the bars ii and i2 and the extreme bottom of the punchings, so us not to interfere with the radial air-movement at this lower part of the stator-frame, as shown by the arrows in Fig. 2.

In large machines, to which my invention is primarily (but not altogether) applicable, it is not enough to provide such a small number of axially disposed punching holding frame-bars as the bars H, l2 and to; because if this were the case, the punchings would tend to spread out axially, at points in between the radially thick frame-bars i2 and i3. ll therefore provide a plurality of radially thin, axially extending punching-retaining means, which are shown in the form of frame-bars Si, 32 and 3B which preferably have their ends secured to the two framerings 23. These thin punching -supporting frame-bars 3|, 32 and 33 are disposed at a suitable number of intermediate points around the circumference of the stator-punchings 6, between the thick frame-bars H, H and i3.

Preferably, all six frame-bars Ii, l2, l3, 3|, 32 and 33 are secured to the end-rings by welding 34, and to the punchings 6 by welding 35. Preferably also, as shown in Fig. 1, each end of the stack of stator-punchings 6 is engaged by an end plate or ring 36, which is welded at 31 to the respective frame-bars |2, |3, 3|, 32 and 33.

In the operation of my invention, the rotormounted fan or blower operates as a veniii tiiatiug means for causing ventilating-air to en ter through the inlet-openings 23 at the respective ends of the machine, and to flow radially outwardly past the end-portions of thestatozo= windings 9 at that end of the machine, and to flow thence radially outwardly past the end portions I4 of the frame-bars ll, l2, i3, 38, 32 and 33, where said. frame-bars extend between the end of the stack of stator-punchings 6 and the frame-ring 23 at that end of the machine. The ventilating-air thus enters the upper and lower annular ventilating-spaces |5U and |L, in which the air is free to spread out or flow both axially and circumferentially over the outer periphery l of the stator-punchings 6, cooling the same.

It is an important feature of my invention that the ventilating-air is discharged from the upper annular ventilating-space i6--U, as well as from the lower annular ventilating-space iE-L, at axially extending outlet-openings it and it, respectively, which are below the center line ill of the machine, so that the top half of the machine is completely closed, so as to render the machine drip-proof. To this end, it is necessary to provide a frame-construction in which there is no radially thick frame-bar between the top center of the machine, at the position occupied by the frame-bar ii, and a point cone siderably below the center-line ii, on each side of the machine, as at the positions occupied by the frame-bars l2 and i3; but this long arcuate space, between the bar ii and the bar or between the bar it and the bar i3, is too long to leave the stator punching-stack unrestricted or free to bulge out axially; and hence I provide intermediate thin frame-bars Bi and 38, at intermediate points within this space. The thinness of these bars provides for an ample air-flow space, or radial-displacement, between the flat tops of these thin bars 35 and and the top enclosure-plate 28, so that the circumferential flow of the ventilating-air is substan tially unrestricted, as said air flows out of the top part of the upper ventilating-space lb-U to the exhaust-openings 66 on either side of the machine.

At the extreme bottom edge of the statorpunchings 6, I provide a third thin frame-bar 32, but there is no substantial circumferential air-flow at this point, and hence, so far as ventilation is concerned, this bottom frame-bar 32 can have any radial thickness which may be dictated by considerations of strength and weight,

A second ventilating-path is also provided, which involves an air-flow from the inlet-opem ings 23 in the end-brackets 2|, into the inner portions of the rotor-member 4, where a rotorsplder 40 supports the rotor-core or stack of rotor-laminations 4|. The rotor-spider also provides a. plurality of central axial ducts or passageways through the rotor-members 4. The rotor-core 4| is provided with a plurality of radially extending ventilating-openings 42, which are in alignment with corresponding radial ventilating-openings 43 in the stator-core or punchings 6.

The rotation of the rotor-member 4 causes this member to act as a centrifugal fan, which draws in ventilating-air, from both ends of the machine, and causes it to flow radially outwardly through the radial ventilating-spaces 42 and 43 in the rotor and stator-members respectively, whence it discharges into the upper and lower annular ventilating-spaces |5U and lB-L, where the air is free to move or expand both axially and circumferentially, while it ventilates the outer periphery of the stator-punchings 6, on its way to the lateral outlet vents l6 and 30 respectively.

As is common in the art, a foot-assembly 50 is made separately, and secured to the cylindrical frame-assembly by suitable welding 5|.

My novel frame-construction thus provides a completely fabricated stator-assembly, all parts of which are made from standard steel sections, involving no burning or other expensive operations. The machine is drip and splash-proof, rugged, and light in weight. Experience has shown that the machine has unusually good ventilation, due to the fact that there are no obstructions in the necessary air-paths, thus causing the machine to run appreciably cooler than similar machines of the same rating.

While I have illustrated my invention in a single illustrative form of embodiment, I wish it to be understood that my invention is not limited to this single precise form, as many changes of substitution, omission and addition can be made by those skilled in the art, while still embodying one or more of the essential features of my invention. I desire, therefore, that the appended claims shall be given the broadest construction consistent with their language.

I claim as my invention:

1. A horizontal-shaft dynamo-electric machine having a stator-member and a rotor-member; said stator-member comprising a stack of annular stator-punchings having a substantially cylindrical outer periphery, and having a bore defining an air gap surrounding the rotor-member, stator-windings carried by the stator-punchings near the bore thereof, a plurality of radially thick punching-holding frame-bars extending axially across the outer periphery of said stack of statorpunchings and extending beyond both ends of the stack, only one of said thick frame-bars being in the region extending from the top to a point below the centerline of the stack of stator-punchings on either side thereof, and that one being at the top, an annular frame-ring secured to the ends of the plurality of thick frame-bars at each end of the machine, said frame-rings having a substantially annular outer periphery which is substantially flush with the outer surfaces of the thick frame-bars, an end-bracket secured to each frame-ring, each end-bracket having a bearingmember for supporting the rotor-member, and having one or more inlet-openings for ventilating-air, ventilating-means for causing ventilating-air to enter through said inlet-openings at the respective ends of the machine and to flow radially outwardly over the end-turns of the sta tor-windings and thence to flow radially outwardly past the end portions of the frame-bars where they extend between the end of the stack of stator-punchings and the frame-ring at that end of the machine, a sheet-like top enclosuremember extending over the top frame-bar and the top portions of the two frame-rings for defining an upper annular ventilating-space between said top enclosure-member and the periphery of the punchings, a sheet-like bottom enclosure-member extending over the bottom portions of the two frame-rings for defining a lower annular ventilating-space between said bottom enclosure-member and the periphery of the punchings, outlet-means for providing outlets, be-' bottom enclosure-members, along the sides of the machine, and a plurality of radially thin, axially extending, punching-retaining means, secured to the outer periphery of the stack of stator-punchings at intermediate points between the thick frame-bars, for preventing axial spreading of said stack while permitting annular airfiow in radial spaces between said thin punchingretaining means and the associated enclosuremember.

2. A horizontal-shaft dynamo-electric machine having a stator-member and a rotor-member; said stator-member comprising a stack of annular stator-punchings having a substantially cylindrical outer periphery, and having a bore defining an air gap surrounding the rotor-member, stator-windings carried by the stator-punchings near the bore thereof, three radially thick punchlug-holding frame-bars extending axially across the outer periphery of said stack of stator-punchings and extending beyond both ends of the stack, one of said thick frame-bars being at the top, and the other two being at the sides below the center-line of the stator-punchings, an annu lar frame-ring secured to the ends of the three thick frame-bars at 'each end of the machine, said frame-rings having a substantially annular outer periphery which is substantially flush with the outer surfaces of the thick frame bars, an end-bracket secured to each frame-ring, each end-bracket having a bearing-member for supporting the rotor-member, and having one or more inlet-openings for ventilating-air, ventilating-means for causing ventilating-air to enter through said inlet-openings at the respective ends of the machine and to flow radially outwardly over the end-turns of the stator-windings and thence to how radially outwardly past the end portions of the frame-bars where they extend between the end of the stack of stator-punchings and the frame-ring at that end of the machine, a sheet-like top enclosure-member extending over the top frame-bar and the top portions of the two frame-rings for defining an upper annular ventilating-space between said top enclosuremember and the periphery of the punchings, a sheet-like bottom enclosure-member extending over the bottom portions of the two frame-rings for defining a lower annular ventilating-space between said bottom enclosure-member and the periphery of the punchings, outlet-means for providing outlets, in the vicinity of the two lowermost thick frame-bars, respectively, for discharging air from the ends of the top and bottom enclosure-members, along the sides of the machine, below the centerline of the statorpunchings, and a plurality of radially thin, axially extending, punching-retaining means, secured to the outer periphery of the stack of stator-punchings at intermediate points between the thick frame-bars, for preventing axial spreading of said stack while permitting annular airflow in radial spaces between said thin punchingretaining means and the associated enclosuremember.

3. A horizontal-shaft dynamo-electric machine having a stator-member and a rotor-member; said stator-member comprising a stack of annular stator-punchings having a substantially cylindrical outer periphery, and having a bore defining an air gap surrounding the rotor-member, stator-windings carried by the stator-punchings near the bore thereof, a plurality of radially thick punching-holding frame-bars extending axially across the outer periphery of said stack of statordeco er 07 6 puhchings, only one oi sold thicir freme bers be log in. the region extending from the top to point below the ceuterline of the stock of stator punchiugs on either side thereof, and that one beiug at the top, on annular to the ends of the plurality of at each end oi the machine, so her/lug at substantially annular outer periphery which is substoutiolly flush with the outer sur faces of the thicl: frame-hers, end en -bracket secured to each frame-ring, each end-bracket having a bearing-member for supporting the rotormeruioer, and having one or more inlet-openings for ventilating-air, e sheetdike top ehclosure= member extending over the top Zreme bsr and the top portions of the two fi-eme rihgs for de finite" an upper ouhuler vezatiletiug spme be tween said top enclosure-member and the periphery oi the punchihgs, a sheetdike bottom enclosure-member extending over the bottom portions oi the two frame-rings for defining a lower euuuler veritilatingespsce between said bottom enclosure-member and the periphery of the punchings, outlet mee'os for providing outlets, below the center-line of the stetor purochihgs, for discharging sir from the ends of the top and bottom enclosure-members, along the sides of the mechiue, and a. plurality of radially thin, axially extending, puncifing-retaining means, secured to the outer periphery of the stack of stator-punchlugs at intermediate points between the thick frame-bars, for preventing axial spreading of said stack while permitting annular air-flow in radial spaces between said this punching-retaming means and the associated enclosure-memher; the stack of stator-punchings having one or more radial ventilating-openings therein, and said rotor-member having one or more corresponding radial ventilating-openings therein, and one or more central axial ducts therethrough, whereby ventilating-air flows radially outwardly through said radial ventilating-openings and then distributes itself axially and clrcumferentially in said annular ventilating-spaces on its way outto said outlet-means.

4. A horizontal-shaft dynamo-electric machine having a. stator-member and a rotor-member;

ing-holding frame-bars extending axially across the outer periphery of said stack of stator-punchlngs, one of said thick frame-bars, being at the top, and the other two being at the sides below the centerline of the stator-punchings, an annular frame ring secured to the ends of the three thick frame-bars at each end of the machine, said frame-rings having a substantially annular outer periphery which is substantially flush with the outer surfaces of the thick frame-bars, an end-bracket secured to each frame ring, each endbrackct having a bearing-member for supporting the rotor-member, and having one or more inlet-openings for ventilating-air, a sheet-like top enclosure-member extending over the top frame-bar and the top portions of the two framerings for defining an upper annular ventilatingspace between said top enclosure-member and the periphery of the punchings, a sheet-like bottom enclosure-member extending over the bottom portions of the two-frame-rings for defining a. lower annular ventilating-space between said bottom enclosme-member and the periphcry of the puuchihgs, outlet-means for: provid ing outlets, below the centeriine of the statorpuzichimgs, for discharging air from the ends of the top and bottom enclosure-=members, along the sides of the machine, and e plurality of re,- dielly thin, axially extending punching-retain ing means, secured to the outervperiphery oi the steel: of stotor-puuchihgs at intermediate points betweeu the thicl: frame-bars, for preventing ex= iol spreading of said steel: while permitting ennular air-flow "in radial spaces between said thin punching-retaining means and the associated enclosure-member; the stack oi ststor-punctungs having one or more redial ventilating-openings therein, and said rotor=member having one or more corresponding redial ventilating opehiugs therein, and one or more control axial ducts therethrough, whereby ventilating-air flows rs.- dially outwardly through said radial ventilatingopenings and then distributes itself axially end circumferentielly in said annular ventilatingspeces on its Way out to said outlet-means.

5. A horizontal-shaft dynamo-electric machine having a stator-member and s rotor-member; said rotor-member having ran-means for drawing in air, at both ends of the machine, for ventilating purposes; said stator-member comprising a. stack of annular stator-punchings having a, substantislly cylindrical outer periphery, and having a bore defining an air gap surrounding the rotormember, stator-windings carried by the statorpunchings near the bore thereof, g plurallty of radially thick punching-holding frame-bars extending axially across the outer periphery of said stack of stator-punchings and extending beyond both ends of the stack, only. one of said thick frame-bars being in the region extending from the top to a point below the centerline of the stack of st-etor-punchings on either side thereof, and that one being at the top, an annular frame-ring secured to the ends of the plurality of thick frame-burs et each end of themachine, said frame-rings having a. substantially annular outer P periphery which is substantially flush with the outer surfaces of the'thick frame-bars, an endbracket secured to each frame-ring, each endbracket having a bearing-member for supporting the rotor-member, and having one or more inletopenings for ventilating-air, and having bafllemeans carried by each end-bracket for causing at least some of the inlet-air to enter the rotor fanmeans at that end of the machine and to flow thence radially outwardly over the end-turns of i the stator-windings and thence to flow radially outwardly past the end portions of the framebars where they extend between the end of the stack of stator-punchings and the frame-ring at that end of the machine, a sheet-like top enclosure-member extending over the top frame-bar and the top portions of the two frame-rings for defining an upper annular ventilating-space between said top enclosure-member and the periphery of the punching's, a sheet-like bottom enclosure-member extending over the bottom portions of the two frame-rings for defining a, lower annular ventilating-space between said bottom enclosure-member and the periphery of the punchings, outlet-means for providing outlets, below the centerline of the stator-punchlngs, for discharging air from the ends of the top and bottom enclosure-members, along the sides of the machine, and a plurality of radially thin, axially extending, punching-retaining means, secured to the outer periphery of the stack of stator-punch- 9 ings at intermediate points between the thick frame-bars, for preventing axial spreading of said stack while permitting annular air-flow in radial spaces between said thin punching-retaining means and the associated enclosure-member.

6'. A horizontal-shaft dynamo-electric machine having-a stator-member and a rotor-member; said rotor-member having fan-means for drawing in air, at both ends of the machine, for ventilating purposes; said stator-member comprising a stack of annular stator-punchings having a substantially cylindrical outer periphery, and having a bore defining an air gap surrounding the rotormember, stator windings carried by the statorpunchings near the bore ther'eoi, three radially thick punching-holding frame-bars extending axially across the outer periphery of said stack of stator-punchings and extending beyond both ends of the stack, one of said thick frame-bars being at the top, and the other two being at the sides below the centerline of the stator-punchings, an annular frame-ring secured to the ends of the three thick frame-bars at each end of the machine, said frame-rings having a substantially annular outer periphery which is substantially fiush with the outer surfaces of the thick framebars, an end-bracket secured to each frame-ring, each end-bracket having a bearing-member for supporting the rotor-member, and having one or more inlet-openings for ventilating-air, and having bafile-means carried by each end-bracket for causing at least some of the inlet-air to enter the rotor fan-means at that end of the machine and to fiow thence radially outwardly over the endturns of the stator-windings and thence to flow radially outwardly past the end portions of the frame-bars where they extend between the end of the stack of stator-punchings and the frame-ring at that end of the machine, a sheet-like top enclosure-member extending over the top framebar and the top portions of the two frame-rings for defining an upper annular ventilating-space between said top enclosure-member and the periphery of the punchings, a sheet-like bottom enclosure-member extending over the bottom portions of the two frame-rings for defining a lower annular ventilating-space between said bottom enclosure-member and the periphery of the punchings, outlet-means for providing outlets, in

the vicinity of the two lowermost thick framebars, respectively, for discharging air from the ends of the top and bottom enclosure-members, along the sides of the machine, below the centerline of the stator-punchings, and a plurality of radially thin, axially extending, punching-retaining means, secured to the outer periphery of the stack of stator-punchings at intermediate points between the thick frame-bars, for preventing axial spreading of said stack while permitting annular air-flow in radial spaces between said thin punching-retaining means and the associated enclosure-member.

7. The invention as defined in claim 5, characterized by the stack of stator-punchings having one or more radial ventilating-openings therein, and said rotormember having one or more corresponding radial ventilating-openings therein, and one or more central axial ducts therethrough, whereby ventilating-air flows radially outwardly through said radial ventilatingopenings and then distributes itself axially and circumferentially in said annular ventilatingspaces on its way out to said outlet-means.

8. The invention as defined in claim 6, char- :terized by the stack of stator-punchings having one or more radial ventilating-openings therein, and said rotor-member having one or more corresponding radial ventilating-openings therein, and one or more central axial ducts therethrough, whereby ventilating-air fiows radially outwardly through said radial ventilatingtheir ends secured to said frame-rings.

12. The invention as defined in claim 4, characterized by said thin, axially extending, punchlug-retaining means being frame-bars having their ends secured to said frame-rings.

13. The invention as defined in claim 5, characterized by said thin,'axially extending, punching-retaining means beingframe-bars having their ends secured to said frame-rings.

14. The invention as defined in clairn'6, ic haracterized by said thin, axially extending. punch ing-retaining means being frame-bars having their ends secured to said frame-rings.

15. A horizontal-shaft dynamo-electric machine having a stator-member and a rotor-member; said stator-member comprising a stack of annular stator-punchings having a substantially cylindrical outer periphery, and having a bore defining an air gap surrounding the rotormember, stator-windings carried by the statorpunchings near the bore thereof, a plurality of radially thick punching-holding frame-bars extending axially across the outer periphery of said stack oi stator-punchings and extending beyond both ends of the stack, only one of said thick frame-bars being in the region extending from the top to a point below the centerline of the stack of stator-punchings on either side thereof, and that one being at the top, an annular frame-ring secured to the ends of the plurality of thick frame-bars at each end of the machine, said frame-rings having a substantially annular outer periphery which is substantially flush with the outer surfaces of the thick frame-bars, an end-bracket secured to each frame-ring, each end-bracket having a bearing-member for supporting the rotor-member, and having one or more inlet-openings for ventilating-air, ventilating-means for causing ventilating-air to enter through said inlet-openings at the respective ends of the machine and to flow radially outwardly over the end-turns of the stator-windings and thence to flow radially outwardly past the end portions of the frame-bars where they extend between the end of the stack of statorpunchings and the frame-ring at that end of the machine, a sheet-like top enclosure-member extending over the top frame-bar and the top portions of the two frame-rings for defining an upper annular ventilating-space between said top enclosure-member and-the periphery of the punchings, a sheet-like bottom enclosure-member extending over the bottom portions of the two frame-rings for defining a lower annular ventilating-space between said bottom encloii sure-member and the periphery oi the punchings, and outlet-means for providing outlets, be low the'centerline of the statorpunehings, for discharging air from the ends of the top and bottom enclosure-members, along the sides of the machine.

16. A horizontal-shaft dynamo-electric ma chine having a stator-member and a rotor-memher; said stator-. member comprising a steel; oi annular stator-punchings having a substantially cylindrical outer periphery, and having a bore defining an air gap surrounding the rotor-member, stator-windings carried by the statorpunchings near the bore thereof, three radially th i: punching-holding iraroe-bars extending axially across the outer periphery of said stack of stator-punchings and extending beyond both ends of the stack, one of said thick frame-bars being at the top, and the other two being at the sides below the centerline of the stator=punch= ings, an annular frame-ring secured to the ends of the three thick frame-bars at each end of the machine, said frame-rings having a substantially annular outer periphery which is substan= tially flush with the outer surfaces of the thi A: frame bars, an end-bracket secured to each frame-ring, each end-bracket having a bearingmember for supporting the rotor-member, and having one or more inlet-openings ior ventilating-air, ventilating-means for causing ventilating-air to enter through said inlet-openings at the respective ends of the machine and to flow radially outwardly over the end-turns of the stator-windings and thence to flow radially outwardly past the end portions of the frame-bars where they extend between the end of the stack of stator-punchings and the frame-ring at that end of the machine, a sheet-like top enclosuremember extending over the top frame-bar and the top portions of the two frame-rings for defining an upper annular ventilating-space between said top enclosure-member and the periphery of the punchings, a sheet-like bottom enclosure-member extending over the bottom portions of the two frame-rings for defining a lower annular ventilating-space between said bottom enclosure-member and the periphery of the punchings, and outlet-means for providing outlets, in the vicinity of the two lowermost thick frame-bars, respectively, for discharging air from the ends of the top and bottom enclosure-members, along the sides of the machine, below the centerline of the stator-punchings.

17. A horizontal-shaft dynamo-electric machine having a stator-member and a rotor-memher; said stator-member comprising a stack of annular stator-punchings having a. substantially cylindrical outer periphery, and having a bore defining an air gap surrounding the rotor-member, stator-windings carried by the stator-punchings near the bore thereof, a, plurality of radially thick punching-holding frame-bars extending axially across the outer periphery of said stack of stator-punchings, only one of said thick frame-bars being in the region extending from the top to a point below the centerline of the stack of stator-punchings on either side thereof, and that one being at the top, an annular framering secured to the ends of the plurality of thick frame-bars at each end of the machine, said frame-rings having a substantially annular outer periphery which is substantially flush with the outer surfaces of the thick frame-bars, an endbracket secured to each frame-ring, each endbracket having a bearing-member for supporting airlines i152 t the rotor-member, and having one or more inletopenlnas for ventilating-air, a sheet lihe top enclosure-member extending over the top framelcar and the top portions oi two frame-rings for defining an upper annular ventilating-space hetween said top enclosure member and the periphery of the punchines, a sheet-dike bottom enclosure=meznher extending over the bottom portions of the two for defining a lower annular ventiiat 1i;,-space between said bottom enclosure=mernher the periphery of the punehings, and outlet-nieans for providing outlets, below the centerline oi the stator-punchings, for discharging air tram the ends of the top and bottom enclosure-members, along the sides of the machine; the steel: of stator-punchings having one or more radial ventilatingopenings therein, and said rotor meniber having one or more corresponding radial ventilating openings therein, and one or more central axial ducts therethrough, whereby ventilating-air flows radially outwardly through said radial venmating-openings and then distributes itself axially and circumierentially in said annular ventilating-spaces on its way out to said outletmeans.

18.- A horizontal-shaft dynamo-electric machine having a statonmemher and a rotor-memher; said stator-member comprising a stack of annular stator-punchings having a substantially cylindrical outer periphery, and having a bore deflning'an air gap surrounding the rotor-memher, stator-windings carried by the stator-punchlngs near the bore thereof, threeradially thick punching-holding frame-bars extending axially across the outer periphery of said stack of stator punchings, one of said thick frame-bars being at the top. and the other two being at the sides below the centerline of the stator-punchings, an annular frame-ring secured to the ends of the three thick frame-bars at each end of the machine, said frame-rings having a substantially annular outer periphery which is substantially flush with the outer surfaces of the thick framebars, an end-bracket secured to each frame-ring, each end-bracket having a bearing-member for supporting the rotor-member, and having one or more inlet-openings for ventilating-air, a sheetlike top enclosure-member extending over the top frame-bar and the top portions of the two framerings for defining an upper annular ventilatingspace between said top enclosure-member and the periphery of the punchings, a sheet-like bottom enclosure-member extending over the bottom portions of the two frame-rings for defining a lower annular ventilating-space between said bottom enclosure-member and the periphery of the punchings, and outlet-means for providing outlets, below the centerline of the stator-punchings, for discharging air from the ends of the top and bottom enclosure-members, along the sides of the machine; the stack of stator-punchings having one or more radial ventilating-openings therein, and said rotor-member having one or more corresponding radial ventilating-openings therein, and one or more central axial ducts therethrough, whereby ventilating-air flows radially outwardly through said radial ventilatingopenings and then distributes itself axially and circumferentially in said annular ventilatingspaces on its way out to said outlet-means.

19. A horizontal-shaft dynamo-electric ma.- chine having a stator-member and a rotor-memher; said rotor-member having fan-means for drawing in air, at both ends of the machine, for ventilating purposes; said stator-member com- 13 prising a stack of annular stator-punchings having a substantially cylindrical outer periphery, and having a bore defining an air gap surrounding the rotor-member, stator-windings carried by the stator-punchings near the bore thereof, a plurality of radially thick punching-holding framebars extending axially across the outer periphery of said stack of stator-punchings and extending beyond both ends of the stack, only one of said thick frame-bars being in the region extending from the top to a point below the centerline of the stack of stator-punchings on either side thereof, and that one being at the top, an annular frame-ring secured to the ends of the plurality of thick frame-bars at each end of the machine, said frame-rings having a substantially annular outer periphery which is substantially fiush with the outer surfaces of the thick framebars, an end-bracket secured to each frame-ring, each end-bracket having a bearing-member for supporting the rotor-member, and having one or more inlet-openings for ventilating-air, and having baffle-means carried by each end-bracket for causing at least some of the inlet-air to enter the rotor fan-means at that end of the machine and to flow thence radially outwardly over the end-turns of the stator-windings and thence to flow radially outwardly past the end portions of the frame-bars where they extend between the end of the stack of stator-punchings and the frame-ring at that end of the machine, a sheetlike top enclosure-member extending over the top frame-bar and the top portions of the two frame-rings for defining an upper annular ventilating-space between said top enclosure-member and the periphery of the punchings, a sheet-like bottom enclosure-member extending over the bottom portions of the two frame-rings for defining a lower annular ventilating-space between said bottom enclosure-member andthe periphery of the punchings, and outlet-means for providing outlets, below the centerline of the stator-punchings, for discharging air from the ends of the top and bottom enclosure-members, along the sides of the machine. 7

20. A horizontal-shaft dynamo-electric machine having a stator-member and a rotor-memher; said rotor-member having fan-means for drawing in air, at both ends of the machine, for

the stator-punchings near the bore thereof, three a radially thick punching-holding frame-bars extending axially across the outer periphery of said stack of stator-punchings and extending beyond both ends of the stack, one of said thick framebars being at the top, and the other two being at the sides below the centerline of the statorpunchings, an annular frame-ring secured to the ends of the three thick frame-bars at each end of the machine, said frame-rings having a substantially annular outer periphery which is substantially flush with the outer surfaces of the thick frame-bars, an end-bracket secured to each frame ring, each end-bracket having a bearing-member for supporting the rotor-member, and having one or more inlet-openings for ventilating-air, and having baflle-means carried by each end-bracket for causing at least some of the inlet-air to enter the rotor fan-means at that end of the machine and to fiow thence radially outwardly over the end-turns of the statorwindings and thence to flow radially outwardly past the end portions of the frame-bars where they extend between the end of the stack of stator-punchings and the frame-ring at that end of the machine, a sheet-like top enclosure-member extending over the top frame-bar and the top portions of the two frame-rings for defining an upper annular ventilating-space between said top enclosure-member and the periphery of the punchings, a sheet-like bottom enclosure-member extending over the bottom portions of the two frame-rings for defining a lower annular ventilating-space between said bottom enclosuremember and the periphery of the punchings, and outlet-means for providing outlets, in the vicinity of the two lowermost thick frame-bars, respectively, for discharging airfrom the ends of the top and bottom enclosure-members, along the sides of the machine, below the centerline of the stator-punchings.

FRANCIS J. JOHNS.

No references cited.

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