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Патент USA US3040290

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June 19, 1962
K. P. WIEDERKEHR
3‚040‚280
INTEGRAL. SHELL TYPE TRANSFORMER
Filed OGL 22, 1958
2 SheetS-She9‘t. 1
June 19, 1962
K. P. WIEDERKEHR
3,040,280
INTEGRAL SHELL TYPE TRANSFORMER
Filed Ost. 22, 1958
2 Shee’cs-Sheet 2
1.I.0
0
1
United States Patent O "1ce
3,040‚280
Patented June 19, 1962
1
2
3,040‚280
FIG. 3 is an isometric view of the coil and core sup
INTEGRAL SHELL TYPE TRANSFORMER
Karl P. Wiederkehr, Elm Grove, Wis., assignor t0 Allis
Chalmers Manufacturing Company, Milwaukee, Wis.
Filed Oct. 22, 1958, Sei‘. N0. 768,999
9 Claims. (C1. 336—92)
port of FIGS. 1 and 2;
FIG. 4 is an end view of a vertical yoke transformer
having the coil and core support of this invention;
FIG. 5 is a plan view of the transformer of FIG. 4;
and
FIG. 6 is an isometric view of one of the support as
This invention relates in general to stationary induction
sernblies shown in FIGS. 4 and 5.
apparatus. More speci?cally this invention relates to a
The three phase horizontal yoke transformer of FIGS.
polyphase transformer having a novel core and coil clamp
1 and 2 c0mprises a tank 10 having an upper section 12
10
ing 'structure.
and a lower section 14, three coil stacks 16, 17 and 18,
The core and coil clarnping struoture of a power trans
former requires particular considera-tion in order to mini
mize space and weight and to simplify the construction
of the transformer. The integral shell type transformer
design is in general very ef?cient in clarnping the core and
the coils because the core and coil clamping structure is
partly combined with the transforrner tank structure. In ‘
and a laminated core.
The core includes a tongue 20
that -is stacked in the windows 22 of the coil stacks, an
outer yoke section 23 that circumscribes the three coil
stacks, and two center yokes 28.
The yoke is partly
cruciform in cross section and is supplemented by a ?ller
29 of wood or other suitable material. The outer yoke
section 23 is stacked on a ?ange 30 mounted on the lower
a single phase integral shell type transformer the coil
section 14 of the tank. The ?ange is suitably reinforced
Stack is circumscribed by a rectangular magnetic yoke 20 as by »ribs 31 along the sides 32 of the tank and by an
that connects the ends of the tongue that is stacked in the
~ ~wi'ridow of the coil. The yoke is clamped between ?anges
mounted on two opposite sections of the tank and the
angle mernber 34 at each end 35 of the tank. Part of the
coil clamping structure associated With the lower sec-tion
14 of the tank includes a coil jacking platte 39 and a num
ber of bolts 40 mounted in stiffeners 41 at each end 35 of
the tank. The bolts 40 ?t into sockets 42 on the coil jack
coil stack is clamped between jacking plates at either
end of each tank. The jacking plates can be tightened
against the coil stacks with both tank sections in place
by means of jacking bolts that pass through the ends of
the tank. In a three phase integral transformer the three
coil stacks representing the three phases are aligned co
ing plate 39 to tighten the coil jacking plate against one
clarnping assernbly.
sui-table means such as ribs 63 in a rigid structure gen
of the outside coil stacks 16 or 18‚
’
Bach of the three coil stacks 16, 17 and 18 is made up
of disk windings 43 that are separated by insulating Wash
axially in the tank and the core includes an outer yoke 30 ers 44. The coil stacks may be individually encased With
section that circumscribes all the coil stacks and two
additional insulation which is not shown in the drawing.
Center yoke elements stacked at seither end of the .center
The transforrner described so far is typical of Well known
phase. In one of the known prior art three phase integral
integral shell -type transformers, and transformers vary
shell type transformers the two tank sections are each
ing in detail may also use the clamping assernblies of this
divided into compartments for the three coil stacks by 0 invention.
means of ?xed cross members that support the two center
As shown in FIG. 3, the novel coil and center yoke sup
yokes. The cross rnembers also anchor part of the coil
port includes an upper assernbly 49 and a lower assembly
jacking assemblies that are used in clamping each of the
50 that are positioned on opposite sides of the center yoke
coil stacks individually. To assemble the transformer,
28 between two adjacent coil stacks 16, 17 and 17, 18.
one tank section is positioned so that the yoke can be 40 The lower assembly 50 comprises two parallel coil Sup
stacked ?at 011 the yoke supporting ?anges, and the lower
port plates 52, 52a and a center yoke support plate 53.
segment of each coil stack is clamped in position in this
The coil support plates 52, 52a and the center yoke sup
section of the tank. Since the clamps for the upper seg
port plate 53 are rigidly connected by suitable means such
ments of the coil stacks are combined with the other tank
as ribs 54 and a ?oor plate 55. Although the assembly
section, temporary jacks and clamps are used to clamp
is illustrated as a channel, the plates 52, 52a and 53 may
the upper segments of the coil stacks while the core is
be ?at individual sections welded together. The coil sup
being stacked. A troublesome problem in constructing
port plat‘es 52, 52a may have a somewhat trapezoidal
such a transformer is that it is necessary to cut holes in
shape so as to conforrn to the shape of the segments of
the tank -to provide accessfor tightening the coil jacking
the coil stacks. Bach lower assembly 50 is mounted in
assemblies between phases.
the lower section 14 of the tank in any suitable way that
The polyphase transformer of this invention has a pair
permits the coil support plates 52, 52a to be adjusted in
of ?oating support assemblies positioned between adjacent
a 1ine parallel to the axis cf the coil stacks and maintains
coil stacks for supporting the center yoke and the coil
the center yoke support plate 53 at the proper level With
stacks. The assemblies are movable parallel to the axis
respect to the outer yoke supporting ?anges 30 to permit
of the coils and the three coil stacks can be clamped 55 stacking the core. As illustrated, adjustable bolts 57 each
by means of conventional coil jacking assemblies at the
having a lock nut 58 are attached to the ?oor plate 55
ends of the tank without cutting holes in the tank Wall.
and support the clamp lower section 50 on the ?oor Wall
Therefore, it is an object of this invention to provide
59 of the tank.
»
a new and improved transformer. '
Bach upper assembly 49 of the coil and center yoke sup
Another object of this invention is to provide a nevv 60 port comprises two parallel support plates 61, 61a and a
and improved transformer having a novel core and coil
center yoke support plate 62 that are cornbined With_
Another object of this invention is to provide a new
erally similar to the lower assembly 50 just described.
and improved transformer that is simpler to build.
In addition each upper assembly 49 includes ‘a locking
Other objects and advantages will be apparent when 65 plate 65 connected to each end of the assembly.
the following description is read in connection with the
T0 assemble the core and the coil stacks, the two lower
following drawings in Which:
'
clamp assemblies 50 -are placed in a lower section 14 of
the tank and the adjusting bolts 57 are adjusted to posi
tal yoke transformer having the core and coil support
tion the yoke support plate 53 at the proper level. Pre
of this invention;
»
70 erably the center yoke support plate 53 is ?ush with the
FIG. 2 is an end view partially in section of the trans
' outer yoke supporting ?ange 30. However, the adjust
former of FIG. l;
ment of the core stacking level can be made partly by the
FIG. 1 is a side view ;iartially in section of the horizon
3,040,2e0
3
4
spaoers 67 that are positioned between the supporting
surfaces 30 and 53 and the ?rst layer of the laminations
of the yoke. The three coil stacks 16, 17 and 18 are
placed in the tank lowver section 14 and the lower segrnent
side plate 84 or to any other suitable part of the assem
bly 77.
of each coil stack is clarnped by tightening the jacking
bolts 40 against the coil jacking plates 39 at ei-ther end cf
base. Two of the clamp assemblies 77 are placed in the
the tank. The two upper support assernblies 49 are placed
in approximately the ?nal position and combine with
The vertical yoke transformer is assembled on its side
and one of the tank sections 73, 73a acts as an assembly
lower assembled tank section 73 or 73a and the assem
blies are adjusted by means of the bolts 96 until the center
yoke support surfaces -8-2 are at the pnoper level with re
spect to the ?ange 74 or 74a for stacking the eore. The
any suitable temporary means to clamp the upper seg
ments of the coil stacks. 'I'he core is then constructed 10 lower assernbled segments cf the three coil stacks 16, 17
by stacking laminations in the coil Windows 22 and on
the supporting su.rfaces 30 and 53.
The upper se=ction 12 of the tank is provided With a
?ange 30a and With coil jacking plates 39 and coil jack
and 18 are clamped in position in the lower assembled
tank section by rneans of a clamping assembly at either
end 0f the tank As illustrated, the clamping assembly
comprises a coil jacking plate 39 and jacking bolts 40 and
ing bolts 40 and is generally sirnilar to the lower section 15 is generally similar to the coil jacking assembly of -the
14 of the tank. lIn addition the tank upper section 12 is
transformer in FIGS. ‘l and 2. The two upper assern
provided wit‚h means 68 f0r engaging the locking plate 65
bled clamp assemblies 77 and the two leg yoke end plates
of the upper assembly 49. As illustrated, the means 68
76 are clamped in position by any suitable temporary
comprises an L-shaped bar attached t0 the side 32a 0f
means. When the core has been stacked, each oppos
the tank upper section and reinforced by a rib 69. When 20 ing pair of clan1p assemblies 77 is co-rmected by an in
sulated holt 97 that passeS through the yoke end‘plate
the tank upper section 112 is positioned on the transformer,
the locking plate 65 of the clamp upper section inter
base 589 of each assembly and :through the two yoke end
loeks with the L-shaped bar 68 0f the upper tank section.
plates 76. Additional insulated bolts 98 _<;onnecting the
The L-shaped bar 68 is positioned an the tank Wall to hold
two yoke end plates 76 are spaced along the-upper leg 72
the center yoke support plate 62 of the upper support as
of the outer yoke secti0n. The adjusting bolts 96 ‚Qf the
sembly 49 at the proper level with respect to the yoke sup
upper clarnp assemblies 77 are adjusted so that the ?ar‘ige,
porting ?anges 30a of the upper section of the tank. Thus
74 0f >the upper assembled section of the tank and the
the center yoke support plate 62 and the outer yoke sup
yoke end plates 76 of the upper clamp -assernblies will be
porting ?anges 30a can be positioned to provide the de
held in alignment when the tank upper assemblied sec
sired the desired clamping force on the larninations by 30 tion is placed in p0sition. When the upper section of
adjusting the tank upper section vertically. The two
the tank has been placed in a position but before the clo—
tank sections 12, 14 are secured in any suitable way such
su-re plate 70 is welded in position, the holding down bolts
as by a closure plate 70 that is welded to the ?anges 30
94 of the upper assernbled section are tightened against
and 30a.
the holding down plate 9‘1. When the transformer is in
Although the means f0r n1ounting the upper assem 35 the upright position, the Opposed pairs of’ assemblies 77
bly 49 in the upper tank section 12 and for mounting
cooperate With the side Walls 93 of the tank to securely
the lower assembly 50 in the lower tank section 14 may,
clamp the laminations cf each center yoke.
ifsdesired, be modi?ed, the construction shown is particu
Although the invention has been illustrated in connec
larly advantageous. The lower assembly 50 is supported
tion with a speci?c transformer design, it will be apparent
through the tank ?oor wall 59 by the heavily reinforced
40 to those skilled in the art that variations can be made
tank base 71, and the upper assembly 49 is connected to
within the scope of the appended claims.‚
Having now particularly described and ascertained
the upper tank sec’cion 12 near the strongly braced outer
y0ke supporting ?anges 30a. Furthermore, the upper as
sembly does not obstruct the space in the upper part of
the tank that is used for electrical connections to the coil
stacks.
In FIGS. 4 and 5 the center yoke and coil support of
this invention is shown in connection With a vertical yoke
transformer. The vertical yoke transformer is in many
ways s_irnilar to the transforrner of FIGS. 1 and 2 and
equivalent components are indicated by the same num—
bersp. The tank extends above the uppermost leg 72 of
the outer yoke section 23 0f the core in order to provide
spacev in the tank for electrical oonnections to the coil
stacks 16, 17, 18. The ~‘ewo sections 73, 73a of the tank
have opposing ?anges 74, 74a for clamping part of the
the nature of my said invention and the manner in which
it is to be perf0rmed, I declare that what I clairn is:
1. In a »polyphase transformer having opposing tank
sections clamping a part of the transformer oore therebe
tween and encasing segments of coaxially aligned coil
stacks, a support for two adjacent coil stacks and the in
tervening center yoke, said support comprising a pair of
assemblies positidnable in said tank sections to support
said center yoke 0n opposite sides, each of said assem
blies comprising a pair of coil support plates rigidly spaced
apart a predetermined distance, and a Center yoke sup
port plate connected to said coil support plates, and means
located at the ends of said tank sections for axially clamp
1'ng together said segrnents and said assemblies.
unter yoke. <The upper leg 72 of the unter section 23 of
2. In combination with a polyphase transformer having
the yoke is clamped between two end plates 76 that co
opposing tank sections clamping a portion of a trans
operate with_ the core and coil clamp of this invention.
former core therebetween and encasing segments of two
’ The four clamping assemblies 77 have equivalent posi 00 adjacent coaxial coil stacks a support for said coil stacks
tions in the transformer and each of the assemblies is
and the intervening center yoke 0f said core, said support
similar. As shown in FIG. 6, each clamping assembly
comprising a pair of assernblies, each of said assernblies
77 eomprises two coil support plates 81, 81a and a cen
comprising a pair of rigidly spaced apart parallelcoil sup
ter yoke support plate 82. The coil support plates 81,
port plates, each said pair of coil support plates being
81a and the center yoke support plate 82 are combined
positioned With its broad surfaces parallel with and be
with suitable means such as a side plate >84 to form a rigid
structure. The lower end 85 of the assembly 77 res-ts on
the?oor Wall 87 of the tank. The upper end of each as
tween adjacent coil stack segrnents and movable in a line
parallel to the axis of said »stacks, a Center yoke support
plate positioned in said one section 011 one side of the in
sembly 77 is cut away- toreceive the end plate 76 0f the
tervening Center yoke ‘in a plane that is ?xed With respect
leg 72, and a yoke end plate base 89 is connected between 70 to said one tank section, and coil clamping means urging *
'the two coil supporting plates 81, 81a. A holding down
said assernblies against said coil stack segrnents for axially
plate 91 is mounted 0x1 the assembly 77 in any accessible
clamping said adjacent Segments in one of said tank sec
location near the tank side wall 93. A holding down holt
tions.
'
94 is positioned on .the tank wall 93 by means cf a
bracket 95. Adjusting bolts 96 are connected to the
3. In combinati0n with a polyphasci,ti*ansformer a coil
and center"yoke support comprising a pair of_ assemblies„
3,040,280
5
6
positioned in opposing sections of a transformer tank on
opposite sides of a center yoke, each of said assemblies
gaging said upper assernbly and maintaining said upper as
sembly in a yoke supporting plane with respect t0 the yoke
supporting ?anges of said upper section, and coil support
ing means located at the ends of said tank sections for
axially clarnping together said segments and said as—
sernblies.
7. In combination With a polyphase transforrner having
opposing tank sections clarnping a portion cf a vertically
p
cornprising a pair of parallel coil support plates rigidly
spaced apart a predeterrnined distance and positioned With
its broad surfaces parallel with and between segments cf
adjacent coil stacks of said transforrner, a center yoke sup
port plate mounted between said coil support plate,
means f0r maintaining said assernblies in a slidable coil
disposed outer yoke cf a transforrner core therebetween
and center yoke supporting position in said sections, and
coil clarnping rneans urging said assernblies against said 10 and encasing segments cf coaxially aligned coil stacks
clamped between the ends of said sections, a coil and
segments of adjacent coil stacks.
center yoke support comprising a pair of assernblies, each
4. In cornbination with a polyphase shell type trans
of said assemblies cornprising a pair of coil support plates
forrner having opposing ?anged tank sections clamping a
rigidly spaced apart the desired distance between said ad
portion of a transformer core therebetween, a coil and
center yoke support comprising a pair of assernblies posi 15 jacent coil stacks, a center yoke support plate mounted be
tween said coil support plates, rneans connected to said
tioned in said tank sections to divide said sections into
assembly and engageable with the side Walls of one of said
compartments for receiving segments of coil stacks of said
tank sections for clarnping said center yoke between oppo
transforrner, each of said assern‘olies comprising a pair ’
site Walls of the transforrner, and coil clarnping rneans
of parallel coil support plates rigidly spaced apart a pre
deterrnined dlstance, a center yoke support plate connected 20 located at the top and bottom of said tank Sections urg
ing said assernblies against said coil segments for axially
to said coil support plates in supporting contact with said
clarnping together said segrnents and said assernblies.
Center yoke, rneans connected to said assernblies and co
8. In cornbination with a poly-phase transformer hav
operating Witl1 the walls of said transforrner tank sections
ing opposing .tank sec-tions clam-ping a portion of a ver
for rnaintaining said assernblies in a slidable coil and
center yoke supporting position, and coil clamping rneans 25 «tically disposed outer yoke 0lf a transformer core there
between and encasing seg-ments 0f coaxially aligned coil
for urging said assemblies against said segments of coil
stacks clamped between the ende 0f said sections, a coil
stacks.
and center yol<e support comprising a pair of yoke end
5. In cornbination With a polyphase shell type trans
plates positioned on opposite sides of the upper leg 0f
former having opposing upper assembled and lower as
sernbled ?anged tank sections clamping a portion of a 30 said outer yoke; a pair of assemblies positioned on the
?oor Walls of said tank sections between said segrnents
horizontally stacked transformer core therebetween, a
coil and center yoke support comprising a pair of assern
of adjacent coil stacks for spacing apart said stacks, each
blies positioned in said tank sections to divide said sections
of said assemblies cornprising a palr of rigidly spaced
into compartrnents for receiving segrnents of coil stacks of
apart parallel coil support plates, a center yoke support
said transformer; each of said assemblies cornprising a 35 platt: connected to said coil support plates, adjusting bolts
pair of parallel coil support plates rigidly spaced apart a
cenneoted to said assemb-ly for rnaintaining a selected
predeterrnined distance, and a center yoke support plate;
clamping force between said center yoke and a wall of
bolts connected to one of said assernblies and engageable
the transformer tank opposite said yoke, rneans connected
with a Wall of the transformer tank for adjustably sup
t0 said assemb'lies for clarnping said end plates to said
porting said one assembly in said lower assembled tank
upper yoke leg, and coil clamping means located at the
section in a core supporting position with respect to the
top and bottom of said tank sections for axially clamping
?anges on said lower assernbled section, means connected
together said coil segrnents and said assemblies.
t0 the other of said assemblies for rnaintaining said other
9. In combination With a poly-phase transformer, a coil
assembly in a slidable coil and Center yoke position in
and center yoke -support comprising a pair of assemblies
said upper assembled section, and coil clamping meaas 45 positioned in opp=osing sections 015 a transformer tank
urging said assemblies against said segments of coil stacks
011 opposite sides of a center yoke, each of said assern
for axially clarnping the adjacent segrnents in one of said
tank sections.
6. In combination with a polyphase transforrner having
opposing upper and lower tank sections clamping the rec
tangular outer yoke portions of a transformer core there
blies comprising a pair 0\f parallel coil support plates
rigidly spaced apart a predeterrnined distance and posi—'
tioned With their broad surfaces parallel with and be
tween segments of adjacent coil stacks of said transform
er, a center yoke support plate mounted between said
coil support plates in supporting contact with said center
yoke, rneans engaging said assemblies and said tank for
rnaintaining said assemblies in a slidable coil and center
between and encasimg segments of coaxially aligned coil
stacks between the ends cf said tank sections, a coil and
center yoke support comprising upper and lower assem
blies, each of said assemblies comprising a pair of coil
support plates rigidly spaced apart the desired distance
between said adjacent coil stacks, and a center yoke sup
port plate connected to said coil support plates, adjusting
bolts connected to said lower assernbly for slidably mount
ing said lower _assembly on the ?oor Wall of said lower 60
tank section at a level corresponding to the level 0rf the
yoke supporting position in said sections, and coil damp
ing means m‘ging said assernblies against said segments‘
of adjacent coils for axially clamping said coils and said
assemblies.
References Cited in the ?le of this patent
UNITED STATES PATENTS
yoke supporting ?anges cf said lower section, said upper
assembly being positionable on the upper side'of said
2‚429‚604
Boucher et a1. _________ -- Oct. 28, 11947
center yoke between the upper segrnents of said stacks,
2‚466‚448
Lentz ___‚ ............. -- Apr. 5, 1949
2‚9\10‚663
Wilk ____. ............ -- Oct. 27, 1959
means connectable to said upper tank section for en
65
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