US2413897A

US2413897A - Transformer

Info

Publication number: US2413897A
Application number: US443101A
Authority: US
Inventors: John M Wilson
Original assignee: Honeywell Inc
Current assignee: Honeywell Inc
Priority date: 1942-05-15
Filing date: 1942-05-15
Publication date: 1947-01-07
Anticipated expiration: 1964-01-07

Description

Jan. 7, 1947. J. M. WILSON TRANSFORMER Filed May 15, 1942 3 Sheets-Sheet 1 INVENTOR.

John M. Wilson Y zz wzwb ATTORNEY Jan. 7, 1947. J. M. WILSON 2,413,897

' TRANSFORMER Filed May 15, 1942 3 Sheets-Sheet 2 Jan. 7, 1947. w o 2,413,897

TRANSFORMER Filed May 15, 1942 S Sheets-Sheet 3 INVENTOK John M. Wilson ATTORNEY o a transformer of Patented Jan. 7, 1947 John M. Wilson,

Minneapolis,

Minneapolis, Minn., Minneapolis-Honeywell Regulator Minn., a corporation of assignor to Company, Delaware Application May 15, 1942, Serial No. 443,101 14 Claims. (Cl. 175-361) This invention relates to transformers but more particularly to improvements therein providing increased economies in the construction of parts, facilitating the easeof assembly of the parts, and generally providing greater utility in transformers not heretofore known in the art.

A broad object of this invention is to provide extremely simple construction of which various parts may readily be interchanged or altered whereby the same transformer may be utilized for a'multiplicity of transformer purposes.

An important object of this invention is to provide a-simple core and winding assembly, an expeditious method of assembling the same, and a novel clamping meansfor holding the parts in assembled relation.

Another objectof this invention is to provide a novel anchor plate for the winding lead wires whereby the electrical connections between the lead wires and the winding are relieved of stresses andstrains exerted upon the lead wires.

A further object is to provide a housing for the core and winding assembly of this invention having means formed therein for retaining the assembly in a predetermined position in the housing, and having parts which may be simply altered and/or readily interchanged whereby the transformer may be utilized for various transformer mountings and circuit connections.

A still further object of this invention is to provide a combination transformer and outlet box in which the casing of the transformer is formed in such a manner as to provide an outlet box at each end of the transformer.

Still other objects are those inherent in or implied from the novel construction, combination, and arrangement of parts not specifically recited herein above which will become manifest upon reading the following specification, reference being had to the attached drawings in which Figure 1 is a face view of one of the core laminations used in the transformer of this invention,

Figure 2 is a perspective view of the core, winding, and clamping means of the transformer illustrating the assembled,

Figure 3 is a cross-sectional view of the transformer shown in Figure 5, being viewed along the lines 3-3 of Fig. 5,

Figure 4 is another cross-sectional view of the transformer shown in Figure 5, being, viewed along the lines 4-4 of Figure 5,

Figure 5 is an elevational view of one assemmanner in which the same are .alternate combined cover Figure '7 is a right side elevational view of the transformer shown in Figure 6,

' Figure 8 is an elevational view of a third assembled form which the transformer might take, again portions of the casing being broken away to illustrate the construction and assembly,

Figure 9 is a right side elevational view transformer shown in Figure 8,

Figure '10 is a reduced combined cover and mounting plate which may of the and mounting plate which may be used on the transformer of this invention,

Figure 12 is a face the. transformer through 9, 13 and 14,e v

Figure 13 is an elevational view of a fourth alternate assembled form which the transformer of this invention might take, portions of the casing being broken away to better disclose the particular construction and assembly,

Figure 14 is a right side elevational view of the transformer shown in Figure 13,

Figure 15 is an elevational view of a combined transformer and outlet box which embodies several of the features of this invention, portions of the casing being broken away to illustrate the construction,

Figure 16 is a left side elevational view of the transformer shown in Figure 15.

Referring first toFigures 3, 4 and 5, the numeral l9 generally designates a transformer which comprises a core and winding assembly generally indicated by thenumeral 20 and a housing therefor, generally designated by the numeral 2i.

The core and winding assembly comprises a primary and

secondary winding

22 and 23 respecview of a development of easing shown in Figures 3 tively, carried by a winding leg 24 of a laminated window type core. The stacked laminations of the leg 24 are pressed into the stacked laminations of the yoke portion 25 of the core, the laminations being held in stacked relation and in pressed relation with respect to each other by a U-shaped clamp, generally designated by the numeral 26.

' spectively,

' straddle the leg 24 24 and 25. As'will hereinafter be pointed out,

the leg portions 36'and 3| are bent over at a time when the laminations are held under pressure. Consequently; the tendency of the laminations to separate provides a frictional means for maintaining the clamp 26 in place on the core.

In Figure 1, a core lamination is shown in. which the leg portion 24 is formed integrally with the yoke portion 25. As a matter of fact, the yoke and leg la out of the same sheet lamination, the two being separated along the

dotted lines

32 and 33. Apertures 34 and-35 are also punched out of the sheet lamination at the

lines

32 and 33 for purposes of providing alignment of the lamination portions in the assembly of the core. It will be noted that the bight portion generally similar to 25 having apertures with the

apertures

34 and 35 of the laminations. The leg portions 30 and 3| areprov-ided with indentations 38 and 39 'whichalso coincide with the

apertures

34 and 35 for a purpose hereinafter to appear. V

In making a core and winding assembly 20, a plurality of

core laminations

24 and 25 are first blanked out. The laminations comprising the yoke 25 are then stacked in the clamp 26 which is preformed to the angular configuration as shown in Figure 2, the leg portions 36 and 3| being bent slightly inwardly. Withthe

apertures

34, 35 of the core laminations in alignment with the the laminations of the yoke v apertures 36, 31 of the clamp, the clamp and .yoke laminations are assembled on a jig 40,

guide pins 4| and 42 carried thereon, occupying the

apertures

34, 35 and 36, 31. The leg laminations 24 are next stacked and the

windings

23, 22 mounted thereon in any convenient manner. The windings and core leg assembly is then mounted on the guide pins 4|, 42 and brought into engagement with the yoke 25. A suitable pressure applying means (not shown) is then applied to the leg 24- forcing the laminationsthereof into engagement with the laminations of theyoke 25. The arrangement of the pressure applying means is such that when the leg 24 and yoke 25 are completely engaged, pressure is applied to the laminations or both core portions, and while the pressure is being applied, the le portions 3|] and 3| of the clamp 26 are bent over by any suitable means until the clamp takes the form as seen in Figure 5. The

indentation

38 and 39 permit the leg portions 36 and 3| to clear the guide pins and 42. The assembly 26 is then conveniently removed'from the jig 46 by simply sliding the assembly oif of the guide pins 4| and 42.

The

ends

43, 44 of the

windings

22, 23 reare brought out to terminal boards 45 and 46 which may be identical, and may be formed of any suitable insulating material. Each board 45, 46 is'inserted between one end of the windings and the yoke 25, each being bifurcated to with the-

bifurcations

41 and 48 fitting snugly between the leg 24 and the yoke 25 as clearly seen in Figure 4. The ends of the windings are wound with one or more turns about projections 49 on the boards 45, 46 and soldered to suitable lead wires 50 and for the

windings

22 and 23 respectively. The lead wires 50 and 5| are securely anchored to the boards 53 and a cover 54 therefor.

ation portions are blanked.

21 of the clamp 26 is shaped 36 and 31 which coincide tions' between the windings and lead wires of such stresses and strains.

The housing 2| comprises a box-shaped casing Referring to Figure 12, it will be seen that the casing 53 is formed of 'a single cross-shaped sheet of metal, the center portion55-of which corresponds to the top of the casing and the

arms

56, 51, 58 and 59 of which comprise the sides of the casing, the sides being bent down about the dotted lines 69, 6|, 62 and 63 to form the box shape thereof.

The assembly 20 is retained in the casin 53 in a definite position therein by depressions 65 formed in the

sides

56 and 51 which engage the sidesof the core yoke 25 as best seen in Figures 3 and 4. Itis to be noted that the casing 53 is formed in such a manner that the

sides

55, 56 and 51 engage the core. Consequently, the assembly20 can only by sliding the same between the depressions 65. It is to be further noted that the clamp 26 is somewhat narrower than the width of the yoke 25 to permit the depressions 65 to engage the yoke. It is obvious that if the depressions were extended adjacent the clamp 26, it would be impossible to remove the casing because of the noncontinuity of the clamp on one side of the core. It is further obvious that if the assembly 2| were rotated through in the plane of the depressions 65, as seen in Figure 3, the depressions 65 would extend adjacent the relatively rounded edges 66 of the clamp 26 and thereby necessitate the use of much in the cover 54. The cover 54 is further provided with a number of apertures 19, by means of which the transformers may be mounted to an outlet box. A further aperture 1| is provided through which the lead wires 5| may be drawn so that the primary winding 22 may be connected into the line circuits brought into the outlet box. It is to be noted that the sides of the casing 53 are substantially the same height as the assembly 20. Consequently, when the cover 54 is secured to the casing 53 the assembly 20 is secured against any movement in the housing 2|.

A plate 13 is disposed adjacent the side 59 of the casing 53 and has an internally threaded nipple 14 staked thereto through which the secondary lead wires 5| are drawn for connections to external circuits, The side 59 is provided with an indentation 15 to accommodate the nipple 14. The plate 13 is retained against the side 59 by depressions 16 similar to the depressions 65 which are also formed in the casing sides 56 and-51. Thus, by this arrangement the secondary winding 23 may be connected to a circuit brought through standard conduit since the nipple 14 can be connected to the conduit. A screw 11 is used to metallicallyconnectthe plate .13 to .thecasin'g side 59 to satisfy underwriters requirements with be removed from the casing assembly 2|) from the respect to providing a continuous ground for the sembly 20 and plate 13 are retained in the casing 53, that the connections to the windings may conveniently be made while the plate 13 and assembly 20 are removed from the casing, thus facilitating the ease of attachment of the plate '88 to the conduit.

In Figures 6, 7, 8, 9, 13 and 14 transformers are shown which are generally similar to the transformer IQ of Figure 5. Accordingly, wherever possible, similar reference characters will be used to indicate similar Darts.

Referring to Figures 6 and 7, the numeral it; generally designates a transformer which is the same as transformer l9 except that a panel l9, formed of any suitable insulation material, has been substituted for the plate 13 and the ends 98 .of the secondary winding 23 are connected to terminals 80 provided on the panel 19. The terminal board 46 is omitted and inserted in place thereof is a wedge 8| to assure a frictional fit of the primary terminal board 45 between the windings and the core as before. When desirable, a fuse 82 may be inserted in series with the secondary winding as clearly seen in Figures 6 and '7.

In Figures 8 and 9 a transformer 83 is shown which differs from the transformer i9 in that an externally threaded nipple M is staked to the casing side 58 which may be provided with an aperture as indicated by the dotted lines 85 in Figure 12. The transformer 89 may be mounted on an outlet box by mounting an outlet box cover plate 89, generally similar to the outlet box cover plate 52 of Figure 5, on the nipple 89, the same being secured thereto by a nut 87. The cover plate 89 is prevented from rotating relative to the casing 53 by a tongue and slot arrangement between the

sides

56 and 51 of the casing 53 and the cover plate 86, the

sides

56 and 51 having tongues 88 which enter slots in the cover plate 86 similar to the slots 89 of cover plate 52. a

It may be desirable to mount the transformer 83 on a wall or other suitable support rather than on an outlet box. For this purpose, the transformer 83 is'provided with a mounting bracket 89 which has slots 99 similar to the slots 89 of the cover plate 54 by means of which it is secured to the casing 53 as in the case of the cover plate 59'. The bracket 89 is also provided with additional apertures 9| by means of which the transformer may conveniently be mounted on a wall or other support. When the mounting bracket 89 is used, both windings of the transformer 83 are connected into circuits which are brought through conduit. Accordingly, it is obvious that since the necessary connections between the conduit and the transformer may be made when the assembly 2| and the plate 73 are removed from the casing 53, such connections are greatly facilitated by such removal.

. In Figures 13 and 14 a transformer 92 is shown which combines the features of the transformers 18 and 83. Transformer 92 may be used with or without the outlet box cover plate 88, the primary lead wires 59 either being connected to circuits in the outlet box or to circuits carried through conduit connected with the nipple 84. The transformer 92 is further provided with the panel 79 respective circuits whenv the casing 95,

of transformer 18. In the transformer 92 however, the fuse 82 has been eliminated to illustrate the construction when a fuse is not used.

' In Figures and 16 a combined outlet box and transformer 93 is shown in which the core and winding assembly is used and similarly retained in a housing therefore as in the case of the foregoing transformers. The housing comprises a casing 94 which is formed of a single sheet of metal folded to provide three sides of 96 and 91 and a cover 98 for the casing which is shaped and fastened similarly to the mounting bracket 89 described in connection with

transformers

83 and 92, conventional tongue and slot means generally indicated at 99 being used. The sides 96 and 9'! carry depressions Hi9 which determine the position of the assembly 29 in the casing 94 as in the case of the foregoing transformers.

The remaining casing sides for enclosing the assembly 28 comprise plates I 9| which are disposed in the housing midway between the assembly and the ends of the casing and cover 98. The spaces between the ends of the plates l0! and the ends of the housing comprise outlet box compartments. The plates I [ll are retained in a definite position in the housing by depressions I02 formed in the casin sides 96 and 91 and arranged on each side of the plates in! as clearly seen in Figures 15and 16;, Apertures I03 are provided in' the plates llli through which the lead wires 50 and 5| of the primary and

secondary windings

22 and 29, respectively, are drawn for connection with their respective circuits which may be drawn into the outlet box compartments through anyone of a number of apertures I94 formed upon removal of the provided in the casing sides 95, 96 and 91. The casing side 95 and the cover 98 are provided with bent portions I06 and I9! respectively, to which cover plates 18 for the outlet boxes may be secured, suitable attaching screws I89 beingused for this purpose.

From the foregoing, it is now apparent that I have provided transformers which are extremely simple in construction and well adaptable for a multiplicity of transformer mountings and circuit connections. The wide utility of these transformers is made possible, largely, by virtue of the novel means for retaining the core and windin assembly in the housing therefor, since by this arrangement, other sides of the housing are available to accommodate various circuit connections and to accommodate various interchangeability of parts to make such circuit connection variations possible. It has also been seen how the construction of the casing has made alternative mountings for the transformers possible.

While I have disclosed several preferred embodiments of my invention, it is to be understood that the disclosures were for purposes of illustrationonly and not to be considered in a limof stacked laminations and a winding surrounding the same and holding said laminations together, said yokes and winding leg being so knock-out plugs I05 shaped that the winding leg may be pressed into said yokes for holding said parts together, and clamping means comprising a substantially U- shaped member including bent over portions pressing laminations of saidyokes together and holding the same in pressed relation whereby chored to said device thereby relieving said electrical connections of stresses and strains exerted upon said lead wire.

3. In combination, an electrical device havin a winding, 9, combined terminal and anchor board secured to said device, a lead wire for connection to an end of said winding, means for electrically connecting said lead wire to the end of said winding on said board, and a plurality of apertures formed in said board for receiving said lead wire in a series of half turns whereby said lead wire is anchored to said device thereby relieving said electrical connections of stresses and strains exerted uponsaid lead wire.

4. A transformer comprising a laminated core including a plurality of interfitting sections, a winding on one of said sections, clamping means comprising a substantially U-shaped member for holding said sections in assembled relation, a casing for said-core and winding, said casing being formed of sheet stock in such a manner that three sides thereof engage said core, and means comprising extrusions formed in two of said three sides for engaging and retaining said core insaidvcasing in a predetermined position therein, and said clamping means being formed in such a manner as-to permit an insertion of said core into said casing between' said retaining means. I

5. Aitransformer comprising a. care including a plurality of interfitting sections, a'winding on one of said sections, clamping means for holding said sections in assembled relation, lead wires connected to said winding, an anchor plate for said lead wires inserted between said winding and core, said clamping means being formed in such a manner as to permit said anchor plate to be inserted between said winding and core, a housing for enclosing said core and winding, means formed in said housing engageable with said core for retaining the same in the housing in a predetermined position therein, said clamping means being formed in such a manner as to permit an insertion of said core into said. housing between said retaining means, and aperture means provided in said housing through which said lead wires may be drawn.

6, A transformer comprising a winding and said member being for the winding, and standard coupling for connection "to standard conduit, secured to I said member through which said lead wires may as to accommodate said electrical conductor means. I

l. A transformer comprising a winding and core assembly. a housing for the assembly, means formed in the housing for retaining the assembly in the housing in a predetermined position therein, a member removably associated with the housing and disposed adjacent a first side thereof, means formed. in a second and third side for retaining said member adjacent said first side, v insertable into said housingfbetween said first side and the retaining means formed in said second and third sides, lead wires means be drawn, said first side being formed in such a manner as to accommodate said coupling means.

8. A transformer comprising a core and winding assembly, a panel, terminals on the panel for connections with the winding, a

. assembly and panel, said panel being disposed -,iormed in such a manner as of said windings, one

core assembly, a. housing for the assembly, means formed in the housing for retaining the assembly in the housing in a predetermined position therein, a member removably associated with the housing and disposed adjacent. a first side thereof, means formed in a second and third side for retaining said member adjacent said first side,

electrical conductor means for connecting thewinding'to an external circuit, and said first side and said member being formed in such a manner adjacent one side of the housing, means formed in second and third sides of the housing for retaining the assembly and panel therein, said assembly and panel being insertable into andremovable from the housing by sliding'the same between said retaining means whereby the winding may be secured tothe terminals and the assembly and'panel inserted "into thehousing as a unit, and said first side being formed in such a manner whereby external made with said terminals when thetransformer is in an assembled condition.

9. A transformer comprising-a plurality of windings, a core for said windings, a housing for enclosing said windings and core, means for retainingsaidwindings and core-in 'said housing, electrical conductor means for connecting said windings with external circuits, said housing comprising a first pair of sides each of which is formed in such a manner as to accommodate the conductor means for one of said windings, one.

of said first pair of-sides being an outlet box cover and having an aperture the conductor means for one of said windings may be drawn, v comprising a member associated, with said housing, and means formed in a second pair of sides for engaging said member and retaining the same in said housing in a predetermined manner whereby said member may be inserted or removed from said housing by sliding the same between said formed means and said housing;

10. A transformer comprising a plurality -of windings, a core for said windings, a housing for enclosing said windings and core, 'means for retaining said windings and core in said housin electrical conductor means for connecting'said windings with external circuits, said housing comprising wflrst pair of sides each of whichis to accommodate the conductor means for one of said first pair of sides having a standard threaded nipple secured thereto, through which the conductor means of one of said windings may be drawn, an outlet box cover secured to the nipple by means of which the transformer may be mounted on a standard outlet box, said housing comprising a third side which serves as a mounting bracket by means of which the transformer may be mounted on a suitable support, said housing comprising fourth and fifth sides in engagement with-said outlet box cover and said third side, and means carried by said fourth and housing tor the connections may be a therein through which i the other of said-first pair of sides taining said windings and core in ;;nipple secured thereto through boxes," the other or said first prising a member removably consisting of spaced member including bent over 'ingflthe. leg and its d ss in operable relaoutlet box cover and said housing.

11. A transformer comprising a plurality oi windings. a core for said windings. a housing for enclosingsaid windings and core, means for resaid housing. electrical conductor means for connecting said with external circuits, said housing comprising a first pair of sides each of which is formed-in such a manner as to accommodate the conductor means for one 01' said windings, one of said first pair of sides having a standard threaded which the con.-

ductormeans' or one of said windings may be drawn and bymeans of which the transformer maybe secured to standard conduit and outlet pair of sides comassociated with said housingrsaid member having'a standard nipple secured thereto through which the conductor means for another of said windings may be drawn and by means of which the transformer may be connected to standard conduit, and means formed in said housing for retaining said membet in a predetermined position therein;

12. In combination, including a casing, a transformer spaced in the. casing, the transiormer integrally connected yokes comprising a plurality oi laminations and an interiltting leg portion comprising a plurality of laminations' having windings for holding the laminations together. and a U-shaped clamping portions for holdtion to said Yokes.

' the ends 01 the other 86 13. In combination, including a "casing, a transformer spaced in the casing, the transformer consisting of spaced integrally connected yokes comprising a plurality of laminations, aperture means in each of the yokes, an interfitting leg portion comprising a plurality of laminations having windings for holding the laminations together, aperture means in at least two sides of the leg portion, a member having bent over portions with aperturestherein for holding the leg and its win'dings in operable relation to said yokes, and when the, clamping member is in holding relation to said transformer the apertures of the clamping member are aligned with the apertures in the yokes and the legportions of the transi'ormer.

14. A transformer comprising windings and a core assembly, clamping means for holding the winding and core assembly in assembled relation, electrical conductor means connected with one of the windings, means for anchoring the conductor means associated with the one winding; a housing for the assembly, one side of the housing having outlet means for the conductor means, a member removably associated with the housing, means on second and third sides of the housing for retaining the windings and core assembly in a predetermined positio'nin said housing, means on the said second and third sides of the housing for positioning the removable member adjacent a fourth side of the ciated with the removable member so that conductor means may be electrically connected with of said windings.

JOHN M. WILSON.

U-shaped clamping housing. and means asso-e