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Патент USA US3074047

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I Jan. 15, 1963
v
a. M. STEIN
3,074,037
ELECTRICAL INDUCTIVE APPARATUS
Filed Sept. 4, 1958
3 Sheets-Sheet 1
I36 86
~
WITNESSES
@ZM
INVENTOR
Gerhard M. Stein
ATTORNEY
Jan. 15, 1963
e. M. STEIN
3,074,037
ELECTRICAL INDUCTIVE APPARATUS
Filed Sept. 4, 1958
s Sheets-Sheet 2
Jan. 15, 1963
e. M. STEIN
3,074,037
ELECTRICAL INDUCTIVE APPARATUS
‘Filed Sept. 4, 1958
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United StatesPatent O
11
1
3,074,937
Patented Jan. 15, 1963
2
3,074,037
Gerhard M. Stein, Sharon, Pa., assignor to Westinghouse
ELECTRKCAL INDUCTIVE APPARATUS
Electric Corporation, East Pittsburgh, Pa, a corpora
tion of Pennsylvania
Filed Sept. 4, 1958, Ser. No. 759,054
12 tCiaims. (Cl. 336—199)
the crossover members connecting the winding sections
of one of the windings shown in FIG. 1;
FIGS. 6 and 7 are diagrammatic views in section illus
trating the individual crossover members shown in FIG. 5;
FIG. 8 is a fragmentary view in elevation illustrating
how the ?nish leads are connected to one of the wind
ings shown in FIG. 1;
FIGS. 9 and 10 are diagrammatic views in section illus
This invention relates to electrical inductive apparatus,
trating the ?nish leads shown in FIG. 8;
such as transformers and, more particularly, to winding 10
FIG. 11 is a diagrammatic top plan view illustrating
arrangements in such apparatus.
how the conducting material is wound in one of the wind
In certain types of electrical inductive apparatus, such
ings shown in FIG. 1;
as transformers, spiral windings or coils are sometimes
FIG. 12 is a simpli?ed outline drawing in elevation of
provided which include a plurality of turns of a layer of
the complete core and coil assembly shown in FIG. 1;
conducting sheet or strip material wound together with a
FIGS. 13 and 14 are partial schematic diagrams of‘
layer of insulation. Such a winding includes one turn
some of the winding sections shown in FIG. 12;
per layer with the turn-to-turn insulation also providing the
FIG. 15 is a fragmentary view in elevation illustrating
layer-to-layer insulation. The conducting material in
how the starting leads would be connected to a winding in
cluded in a winding of this type may comprise one or more
copper conductors disposed side by side or on top of each
other. A conventional winding of this type includes a
single section in which the leads are brazed to the two
a second embodiment of this invention;
FIG. 16 is a diagrammatic view in section illustrating
the starting leads shown in FIG. 14;
FIG. 17 is a fragmentary view in elevation illustrating
ends of the conducting material included in the winding.
how the ?nish leads are connected to a winding in the sec
Single section spiral windings or coils are limited, how
ond embodiment of the invention;
ever, usually to relatively large current ratings, since for 25
FIGS. 18 and 19 are diagrammatic views in section
smaller current ratings the conducting material becomes
illustrating the ?nish leads shown in FIG. 17;
too thin and the windings mechanically weak. In addi
FIGS. 20 and 21 are diagrammatic views illustrating
tion, single section spiral windings of the type described
how the conducting material is Wound in different winding
are not always suitable for interleaved construction in
sections of a winding in the second embodiment of the
windings which are employed for three-wire operation. 30 invention; and
It is, therefore, desirable to provide spiral windings or
FIG. 22 is a partial schematic diagram illustrating how
coils of the type described having two or more winding
sections and suitable for use in lower current applications
several winding sections are connected in the second
embodiment of the invention.
Referring now to the drawing and FIGS. 1 and 12 in
and for interleaved construction required for three-wire
operation. It is also desirable to provide a suitable in 35 particular, there is illustrated a transformer core and coil
sulating and cooling arrangement which is uniquely
assembly 100 illustrating a ?rst embodiment of the inven
adapted for a spiral winding having a plurality of wind
tion. In general, the transformer core and coil assembly
ing sections of the type disclosed preferably disposed on
100 comprises a magnetic core 40 having a ?rst winding
different winding leg portions of a common magnetic core.
It is an object of this invention to provide a new and
improved electrical inductive apparatus, such as a trans
former.
leg member 42 on which a ?rst winding 50 and a second
winding 30 are disposed and a second winding leg member
44 on which a ?rst winding 60 and a second winding 80
'
are disposed as shown in outline in FIG. 12. The wind'ng
60 is identical to the winding 50 and the winding 80 is
improved winding and insulating arrangement for a trans
identical to the winding 30. The windings 30 and 80 may
former which includes a windfng having a plurality of 45 be of any conventional construction and disposed in in
spirally wound turns of conducting sheet or strip mate
ductive relationship around the associated ?rst windings
rial.
50 and 60, respectively, on the ?rst and second winding
A more speci?c object of this invention is to provide a
leg members 42 and 44, respectively, of the magnetic core
new construction for a core and coil assembly in an elec
40. Since the ?rst windings 50 and 60 are identical, only
trical inductive apparatus, such as a transformer, com 50 the ?rst Winding 50 will be described in detail. It is to
prising a plurality of windings disposed on a magnetic
be understood that the teachings of this invention can
core, at least one of said windings including a plurality
be embodied in a winding disposed on a magnetic core
of spirally wound turns of conducting strip or sheet mate
having one or more winding leg portions.
Another object of this invention is to provide a new and
rial in which the magnetic coupling between said wind
Referring again to FIGS. 1 and 12, the ?rst winding 50
ings is improved.
55 is disposed on the ?rst winding leg member 42, which
Other objects of the invention will, in part, be obvious
and will, in part, appear hereinafter.
.
may be of the cruciform type since the ?rst winding 50
and the second wind-Eng 30 are preferab‘y D-shaped in
cross section. In particu‘ar, the ?rst winding 59 com- ‘
For a fuller understanding of the nature and objects
prises a ?rst winding section 50A and a second winding
of the invention, reference should be had to the follow
ing detailed description taken in connection with the ac 60 section 50B, each including the outer portions SOAO and
companying drawings, in which:
50BO respectively and the inner portions SllAI and 5031
respectively and each having a plurality of turns of con
FIGURE 1 is a partial top plan view in section’of a
ducting sheet material sp‘rally wound in the same direc
transformer core and coil assembly illustrating the teach
ings of this invention;
, tion toge‘her with a layer of insulation around the wind
FIG. 2 is a fragmentary view in elevation illustrating 65 ing leg member 42 of the magnetic core 40.
Referring to FIGS. 1, 5 and 12, the inner portion
how the starting leads are connected to one of the wind
StlAI of the ?rst winding section 50A of the winding
ings of the core and coil assembly shown in FIG. 1;
50 inc'udes a plurality of turns of the conducting sheet
FIGS. 3 and 4 are diagrammatic views in section illus
or s‘rip material 54 which is spirally wound together with
trating how the starting leads are connected to the wind
70 a layer of insulation 66 around a supporting member 52
ing sections of one of the windings shown in FIG. 1;
which maybe formed from a suitable insulating material
FIG. 5 is a fragmentary view in elevation illustrating
and disposed between the ?rst winding 50 and the wind
3,074,037
3
4
.
50B of the winding 50 and the second winding 30, the
inner portion of each of the winding sections 50A and
50B is connected in series with the outer portion of the
associated winding section of the winding 50. The lat
ing leg member 42 of the magnetic core 40. The outer
portion SllAO of the ?rst winding section 5 3A similarly
inzludes a plurality of turns of the conducting sheet
material 154 spirally wound together with a layer of
insulation 166 around the inner portion 50AI. Similarly,
the second winding section 50B includes an inner portion
ter arrangement also provides an interleaved construc
tion which is required or desirable for three wire opera
tion of the ?rst windings 50 and 60 which are disposed on
50BI and an outer portion 50BO each including a plural
ity of spirally wound turns of the conducting sheet mate
rials 64 and 164 respectively and the layers of insula
the ?rst and second winding leg members 42 and 44 re~
sections 50A and 503, respectively, is illustrated. The
second winding section 50B. Similarly, there is illus
trated the crossover member 110, which is preferably
spectively of the magnetic core 40, as shown in FIG. 12.
Referring to FIGS. 5, 6 and 7, there is illustrated the
tion 66 and 166, respectively.
.
6
10
crossover member 120, which is preferably Z-shaped, for
Referring to FIGS. 2, 3 and 4, the'manner in which
electrically connecting the inner portion StlAI of the ?rst
the starting leads 32 and 34 are connected to the inner
winding section 50A to the outer portion 50BO of the
portions 50AI and StlBI of the ?rst and second winding
starting lead 32 is secured or brazedl tothe inner end of
Z-shaped, for electrically connecting the outer end of the
inner porlion 50BI of the second winding section 598 to
the inner endvof the outer portion 50AO of the ?rst wind
ing section 50A. As already described generally, the
the conducting sheet material 54 of the inner portion
. SllAI of the ?rst winding section 50A. The insulation 36
which may be in the form of insulating tape or anspecnial
formed insulating tub: is provided aroundthe lead 32.
The starting lead 34 is secur d or brazed to the inner end 20 outer port'ons 50AO and 50BO of the ?rst and second
winding sections 50A and 50B respectively each com
of the conducting sheet material 64 from which the in
ner portion 50BI of the second winding section 50 is,
wound. A plu'tality of insulating collar members 46, 76
and 96 are provided to insulate the turns of each of the
inner portions 50AI and 5031 of the w'nrling sections 25
50A and SEE from each other and to insulate the turns of
the respective inner portions 50AI and SDBI from each
other. The insulating collar memb'rs 46 and 96 are pro
vided at the upper edge of the conducting ma‘erial 54
and at the lower edge of the conducting material 64, re
spestive‘y, to provide additional creep insu'ation. The
insulating ?ler member 44 is provided to subs‘antially
equalize the space cccupIed by the starting'leads 32 and
34. The insulating collar members 46, 76 and, 96 may be
formed from an in ulatiag strip material, such as press
board, and se:ured to the layer of insulation 66 as shown
in FIGS. 3 and 4 by a suitable method such as bonding or
gluing with a binder.
prise a plurality of turns of the conducting sheet or strip
materials 154 and 164, respectively, which are spirally
Wound together with a layer of insulation 166. The in
s‘ulating collar members 146, 176 and 196 are included in
similar fashion in the outer portions SOAO and SGBO of
the ?rst and seccnd winding sections 50A vand 50B re
spectively to the insulating collar members 46, 76 and 96
of the inner portions 50AI and StlBI and for the same
purpose. The crossover member 120 is secured or brazed
to the outer end of the conducting sheet material 54 and
to the in ter end of the conducting sheet material 164.
On the other hand. the crossover member 110 is secured
or brazed to the outer end of the conducting sheet mate
; rial 64 and to the inner end of the conducting sheet
material 154. It is to be noted that the crossover mem
bers 110 and 120 are disposed at a point which is approxie
mately at the midpoint of the winding of the turns of the
,
?rst and second winding sections SBA and 50B. It is also
, Referring to FIGS. 1, 3 and 4, the foll'w'ng turn of
the conducting sheet mste'ials 54 and 64 is ilustrated 40 to be noted that the crossover conducting members 110
and 120 are electrically insulated from each other by
additional layers of insulating material 33, 35 and 37
whirh are separate from the layers of insulation 66' and
vided between the adjacent turns ofthe winding sections
166 wh‘ch are spirally wound together with the conduct
50A and 5GB. Referri lg to FIG. 1. a plurality of duct
forming members 32 may be provided or disposed in 45 ingsheet materials 54, 64, 154 and 164 as shown inv
adjacent to the starting leads 32 and 34, respective'y. A
duct forming member or spacing member 82 may be pro
spaced’ relationship to provide cooling ducts betwe n the .
FIGS. 5, 6 and 7.
,
.
-
\
Referring to FIG. 6, the connections of the crossover
turns of the winding seztfons 50A and 50B of the ?rst
member 110 are shown'in detail with the‘ crossover mem-'
winding 50. The duct forming members 82 are prefer
her 120 omitted from the diagrammatic view, which is
ably common to both of the winding sections 50A and
50B. The duct forming members 82 may be secured or 50 in section- The lower end of the crossover member 110
is secured or brazed to the outer end of the conducting
bonded to the other side of the layer of insulation 66, as
sheet or strip material 64 from which the turns of the
shown in FIGS. 3 and 4.
>7
,
inner portion of the second winding section 50B are
Referring to FIG. 3, the starting lead 32 and its asso
formed. The upper end of the crossover member'lltl is
ciated insulating member 36 may be disposed directly
secured or brazed .to the inner end of the conducting sheet
againstthe supporting member‘ or tube 52. The starting
material 154 from which the turns of the outer portion
lead 32 is then brazed or secured to the inner end of the
50AO of the ?rst winding section 50A are formed.’ The
conducting sheet material 54 of' the‘ inner portion 50AI
of the ?rst winding section 50A. ‘The in‘ula‘t'ing ?ller
member 44 is disposed between the‘ supporting member
next adjacent turn of the outer portions 5tiAO and 5030 ,
is also shown in section in FIG. 6. The additional insu
52 and the conducting sheet material 64 from‘ which the 60 lating layer 37 is shown between the outer end of the .
" inner portion‘StlBI of the second winding, section 56B is 7 conducting sheet material 64 and the adjacent turn of the
same conducting material 64. The additional insulat
wound. Referring to FIG. 4, the starting lead 34 and its
inglayer 35 is disposed between the crossover members‘
associated insulating member 38 are disposed adjacent, to
119 and 12.0. The additional insulating layer 33 is shown
the starting lead 32 directly in contact with the support;
ing member 52. The starting‘ lead 34 is. secured or brazed 65 disposed between the layer of insulation 166 and the cross
over member 110. The adjacent turns of the conducting‘
to the inner end .of thecon'duc‘ting sheetematerial 64. It
sheet materials 154 and 164 and the associated ‘insulating
is to be noted that the conducting sheet materials 54 and
collar members 146 and176 and 196 are also shown in
64 from which the‘ turns of the inner portions SDAI and
section in FIG. 6.
.
.
50131 of the ?rst and second‘ winding sectii'ns 50A and
Referring to FIG. 7, the connections of the crossover
50B, respectively, are formed are both spirally wound in
the same direction around the ‘supporting member or‘ tube
52, preferably simultaneously in the same, winding
operation.
'
e
n
T’,
In‘ order to substantially equalize the‘ magnetic coupling
between the ?rst and~ second winding': sections 50A- and
member 120 is shown in greater detail, . In similar fash
ion, the crossover member 110 is omitted frornthe dia
grammatic view in section shown in FIG. 7. The upper
end of the crossover member 126 is‘ secured or brazed to
the outer end of the’ conducting sheet material 54' from
3,074,037
5
6
which the turns of the inner portion SOAI of the ?rst wind
ing section 58A are formed. The lower end of the cross
The lower end of the inner portion 50131 of the second
winding section 50B is connected to the terminal 98
over member 120 is secured or brazed to the inner end of
through the starting lead 34.
the conducting sheet material 164 from which the turns of
the outer portion 50130 of the second winding section 58B
are formed or wound.
The adjacent turns of the inner
and outer portions of the ?rst and second winding sec
tions 50A and 50B are also shown in section in FIG. 7
For a series, two wire connection of the winding 50,
the external terminals 78 and 88 are connected together
with a conductor (not shown) and the terminals 68 and
98 are connected to a source of alternating current (not
shown) for a particular voltage rating. For a parallel
in similar manner to FIG. 6. The additional layers of in- ' connection of the winding 50, the terminals 68 and 78
sulation 33, 35 and 37 for insulating crossover members 10 are connected together by a conductor (not shown) and
110 and 120 from each other and from the adjacent turns
the terminals 88 and 98 are connected together by a sepa
of the ?rst and second winding sections 58A and 50B
are also shown in FIG. 7. It is to be noted that the
turns of the inner and outer portions of each of the ?rst and
second winding sections 50A and 50B, respectively, are
wound in the same direction.
Referring now to FIGS. 8, 9 and 10, the manner in
which the ?nish leads are connected to the outer ends of
the outer portions SOAO and 50BO of the ?rst and second
rate conductor (not shown). Each of the pairs of termi
nals 68 and 88 and 78 and 98 respectively would then be
connected to a source of alternating current (not shown)
having an associated voltage rating which is half as large
as the voltage rating associated with the series connection.
For series, three Wire operation, the terminals 78 and 88
are connected together by a conductor (not shown) and
the terminals 68 and 98 along with the pair of terminals
winding sections 50A and 508, respectively, is illustrated. 20 78 and 88 are connected to a three-wire source of alter
The ?nish lead 84 is secured or brazed to the outer end
nating current (not shown).
of the conducting strip material 154 and the ?nish lead
Referring to FIG. 14, the operation of the ?rst wind
86 is secured or brazed to the outer end of the conducting
ing 58 and the ?rst winding 60 disposed on the winding
strip material 164. The ?nish lead 84 is provided with
leg members 42 and 44, respectively, can more readily
suitable insulation 138 in the form of an insulating tape 25 be appreciated by considering an equivalent schematic
or specially formed insulating tube and the ?nish lead
diagram for one of several possible connections of the
86 is provided with insulation 136 which is in a suitable
said windings. Considering the ?rst winding 58, the ?rst
form, such as an insulating tape or a specially formed
winding section 50A comprises the outer portion SOAO
insulating tube. The insulating ?ller member 144 is pro
and the inner portion 50AI. The second winding sec
vided to substantially equalize the space occupied by the 30 tion 50B comprises an outer portion 50‘BO and an inner
?nish leads 84 and 86.
portion 50BI. The outer portion 50AO of the ?rst wind
Referring to FIG. 9, the arrangement of the ?nish lead
ing section 50A is connected in series circuit relation
86 is shown in greater detail. The end of the layer of
with the inner portion SOBI of the second winding sec.
insulation 166 is disposed under the outer ends of the con
tion 50B. In like manner, the inner portion SOAI of
ducting sheet materials 154 and 164, and the outline 58
the ?rst winding section 50A is connected in series circuit
indicates the layer of insulation between the windings
5t) and 38 which is shown in FIG. 1 to be preferably
D-shaped in cross section.
Referring to FIG. 10, the arrangement of the ?nish
lead 84 is also shown in greater detail in section. The
layer of insulation 58 between the windings 5'0 and 30
is also shown in outline. It is to be understood that the
starting leads 32 and 34, shown in FIG. 2, and the ?nish
leads 84 and 86 may be brought out at different ends of
the winding 58 in a particular application.
Referring to FlG. ll, there is illustrated in diagram
matic form the direction of winding of the turns of the
conducting sheet materials 54 and 154 which make up the
inner portions and outer portions S?AI and 50AO of the
?rst winding section 50A. The same direction of wind
ing is used for the ?rst and second winding sections 56A
and 5813 respectively. The starting leads 32 and 34 are
indicated as being disposed at the inside of the winding
59 and the ?nish leads 84 and 86 are indicated gen
erally as being disposed at the outside of the winding
58.
Referring to FIG. 13, the operation of the winding
58 disposed on a magnetic core having a single winding
leg portion is illustrated by an equivalent schematic dia
relation with the outer portion 50130 of the second wind
ing section 50B by the crossover member 129. The
upper end of the outer portion SGAO of the ?rst winding
section 50A is connected to the upper end of the inner
portion 60AI of the ?rst winding section 68A through
the ?nish lead 84 and the conductor 185. The upper
end of the inner portion 50AI of the ?rst winding sec
tion 50A is connected to the terminal 168 through the
starting lead 32. The lower end of the outer portion
50BO of the second winding section 58B is connected to
the lower end of the inner portion 60‘BI of the second
winding section 60B of the winding 60 through the ?nish
lead 86 and the conductor 187. The lower end of the
inner portion SO‘BI of the second winding section 50B is
connected to the terminal 178 through the starting lead
34. The ?rst winding 60 disposed on the winding leg
member 44 includes the ?rst and second winding sections
‘60A and 60B similarly to the winding 50 and is con
nected similarly to the terminals 188 and 198 and to
the Winding 50 in similar fashion as shown in FIG. 14.
For a series, two wire connection of the windings 5t’)
and 60, the external terminals 178 and 198 are con
nected together with a conductor (not shown) and the
terminals 168 and 188 are connected to a source of
gram. The ?rst winding section 58A comprises the outer 60 alternating current (not shown) for a particular voltage
portion SOAO and the inner portion 58AI. The second
rating. For a parallel connection of the windings 5i]
Winding section 50B comprises the outer portion 58130
and '60, the terminals 168 and 178 are connected to
and the inner portion 5881. The outer portion 58AO of
gether by a conductor (not shown)v and the terminals
the ?rst winding section 58A is connected in series circuit
188 and 198 are connected together by a separate con
relation with the inner portion Sit-B1 of the second wind 65 ductor (not shown). Each of the pairs of terminals
ing section 58B. Similarly, the inner portion StlAl of the
168 and 178 and 188 and 198 respectively would then
?rst winding section 58A is connected in series with the
be connected to one side of a source of ‘alternating our
outer portion SGBOv or": the second winding section 58B.
rent (not shown) having an associated voltage rating
The upper end of the outer portion 58AO of the ?rst
which is half as great as the voltage rating associated
winding section 58A is connected to the terminal 78 by
with the series connection. For series, three-wire opera
the ?nish lead 84. The upper end of the inner portion
tion, the terminals 178 and 198 are connected together
SGAI of the ?rst winding 58A is connected to the terminal
by a conductor (not shown), and the terminals 168 and
88 through the starting lead 32. The lower end of the
188 along with the pair of terminals 178 and 198 would
outer portion SttBO of the second winding section 58B
then be connected to a three-wire source of alternating
is connected to the terminal 68 through the ?nish lead 86. 75 current (not shown).
3,074,087
In summary, a winding including a plurality of wind
ing sections as disclosed with suitable crossover mem
bers connecting the different portions of the winding
sections substantially equalizes the coupling between such
a winding and a second winding disposed on a common
and the adjacent turn of the layer of insulation 265 which
is spirally wound together with the turns of the conduct
ing sheet material 254 to form the ?rst winding section
250A. As shown in FIG. 16, the ?rst winding section
250A also includes ?rst and second insulating collar
members 246 and 275 which are disposed on each side
of the conducting sheet material 254 and which may be
secured or bonded to one side of the associated layer
of insulation 265 for the same purpose as the insulating
crease the efficiency of a transformer core and coil as 10 collar members 276 and 296. The insulating collar
members 246 and 296‘ also provide additional creep in
sembly incorporating the teachings of the invention.
sulation between the adjacent turns of the ?rst and sec
When one of the windings of a transformer core and
magnetic core and provide an interleaved construction
which permits the application of an unbalanced three
wire load and reduces the circulating currents in a wind
ing as disclosed and the associated losses to thereby in
coil assembly, such as the winding 50, includes the cross
ond winding sections 250A and 25013, respectively. The
over connections and members as disclosed, it is not
inner ends of the ?rst and second winding sections 253A
necessary to provide interleaving in the associated sec
and 25013 are, therefore, electrically connected together
by the generally L-shaped member 219 which is formed
ond winding 30 in order to insure substantially equal
magnetic coupling between the different winding sections
from a conducting material. As already noted, the ?rst
and second winding sections ZStBA and 2568 are wound
in opposite directions about the supporting member 2232.
Referring to FIGS. 15 through 22, there is illustrated
Referring to FIGS. l7, l8 and 19, the manner in
a-second embodiment of the invention which is par 20
of the winding Strand the winding 30.
7
ticularly applicable for smaller current ratings required
'W ich the ?nish leads are secured or connected to the
in a transformer winding. ‘In general, the second em
bodiment of the invention'is similar to the?rst embodi
?rst and second winding sections ZStlA and 25613 is illus
ment of the invention shown-in FIGS. 1 through 14 and
previously describedaexcept that a windingot the second
outer end of the conducting sheet material 251i from
type does not include the crossover members and con
nections which were included in the winding of the first
type disclosed. ‘In other words, theswinding "of the
second type does not include an interleaved construc
tion such as included in a winding of the ?rst type.
In particular, a winding 25d. of the second type in
cludes a ?rst winding section 250A as shown diagram»
matically in FIG. 20 anda second or lower windingsec
tion 25GB as shown in FIG. 21. The winding sections
250A and 25GB each include-a plurality of turns of the
trated.
The ?nish lead 232 is secured or brazed to the
which the turns of the ?rst winding section ZS?A are
wound. The ?nish lead 232 is provided with a suitable
insulation sale, which may be in the form of an insulating
tape or a specially formed insulating tube. The ?nish
lead 234 is secured or brazed to the outer end of the
conducting sheet material 264 from which the turns of
the second winding section 2568 are wound and is sin1i<
larly provided with a suitable insulation 233. An insulat
ing ?ller member 267 is provided below the ?nish lead
232 in order to substantially equalize the space occupied
by the ?nish leads 232 and 234, respectively.
Referring to FIG. 18, the detailed arrangement f the
conducting ‘sheet materials 254‘ ‘and 264, respectively,
?nish lead 232 is illustrated. The'insulation between the
whichare spirally wound in‘opposite, directions around
winding 25%)‘ and a second winding, (not shown) is indi»
a portion of a magnetic. core (not shown) which is
cated in outline by 258 which would form the winding
similar to the magnetic core’ 40‘ shown in FIG. 12.
The ?rst and second winding sections 250A. and 25GB All) to-winding insulation in a complete transformer core and
are spirally wound in. opposite directions around a
would
coil assembly.
be disposed
7 Thein winding-to-winding
similar fashion to the
insulation
winding»to~
supporting member or insulating tube 252 wh'ch would
winding
insulation
53
shown
in
FIG.
1.
The
arrange
be disposed between the winding 25d and a magnetic
ment of the '?nishlead 234- is shown in detail in FIG. 19.
core (not shown). The manner in which the winding
The winding-to-winding insulation which would also sur- '
of the winding sections 250A and 25% is started is
round the ?nish lead 234 and its associated insulatiMr
shown in-detail in FIGS. Y15 and 16. One of the winding
member 233 15 slrmlarly indicated at 258. The insulating
sections 250A and 25ilB is wound ?rst on the supporting
?llenmember 267 may be formed from a suitable in
member 252 in a predetermined direction. For ex~
a
ample, the second winding section 250B comprises a
o
.
.
1
sulatlng material, such as pressboard.
‘if’:
'
It is to be understood that duct forming members or
plurality of turns of a conducting sheet ‘or strip material 50
spacing members (not shown) may be included in a
264 and a layer of insulation 266 which are spirally
wound together around the supporting member 252.
The ?rst step in the winding of the second winding sec
tion 250B is to secure or braze 2. preferably L-shaped
member 210 to the inner end of the conducting‘sheet
material 264. The insulating collar members 275 and
296 are provided on each side of the conducting sheet
material, 64 and may be secured or bonded to the layer
‘ of insulation 266 to‘provide additional insulation be
tween the turns of the second winding section 25GB
and’ between the turns of the ?rst and second winding .
wrndmgZSO mcorporting the teachings of this inven
tion. Such duct forming members would be disposed in
similar fashion to the duct forming members 82 shown
in FIG. 1 between adjacent turns of the winding 25% to
provide cooling ducts for more efficient cooling of the
winding 25d.‘ Such duct forming members, as well as
the duct forming memberstlZ shown in HS. 1, may be
formed from a suitable insulating7 material, such as Wood
rods.
Referring to FIG, 22, an equivalent partial schematic
; diagram is shown for the winding 250‘ and an identical
sections ZStlAand 250B respectively.
winding 2% which would be each disposedon wind
The next step in winding the second Winding section’
mgleg member of a magnetic core (not shown) similarly
2503 is’ to place'an insulating ?ller member 255 be
tweenrthe L-shaped member210 and, the adjacent turn 65 to thewmdmgs 5i} and 6% shown in PEG. vl2. The
L-shaped member 219 connecting the ?rst and second
of the layer of insulation 266 as shown in FIG. 16. A
plurality of turns of the conducting sheet material 264‘
and the ‘associated layer of insulation 266 are, then,
spirally wound around the supporting member 252" in
‘a ?rst predetermined direction. The .?r‘st winding sec 70
tion 250A is then started by securing or brazing the
inner end of the conducting sheet material 254 to the
winding sections 25tlA; and 25193 of the winding 25% in: V
series is’conveniently located at the inner end of each
of said winding sections. Therefore, in order to .in
.sure the proper polarity of the induced voltages in the
‘?rst and second: winding'sections 256A and 2563, re
spectively, the ?rst and second winding'sections 25%)5
upper endof the L-shaped member 21%) as shown in
and 259B vmust be wound in opposite directions since .
‘FIG. .15. ,An-insulating ?ller member 253 :is, then;
the currentvflow in the winding section 25ilA would other
.wise' be opposite to that in the winding sectionlitiillli with
placed between the preferably L=shaped member. 2130 .
9
respect to the inner and outer ends of each of said wind
ing sections.
10
tion may be wound simultaneously with the associated
conducting sheet material from which the turns of the
various winding sections are formed. Further, the lead
The outer end of the ?rst winding section 250A is con
nected through the ?nish lead 232 to the terminal 312.
connections to the different Winding sections of a wind
The outer end of the second winding section 250B as
ing as disclosed are conveniently made to external termi
illustrated is connected to the terminal 310 through the
nals associated with a transformer core and coil as
?nish lead 234. The winding 260 is connected in similar
sembly.
manner to the terminals 320‘ and 322. For parallel oper
Since numerous changes may be made in the above
ation of the windings 250 and 260, the terminals 312 and
described apparatus and different embodiments of the
320 would be connected to the terminal 302 and the 10 invention may be made without departing from the spirit
terminals 310 and 322 would be connected to the termi
thereof, it is intended that all the matter contained in
nal 300 as shown in FIG. 22. The terminals 309 and
the foregoing description or shown in the accompany
302 would then be connected to a source of alternating
ing drawings shall be interpreted as illustrative and not
current (not shown). For series operation of the wind
in a limiting sense.
ings 250 and 260, said windings would be reconnected so 15
I claim as my invention:
that instead the terminals 310 and 320 would be con
1. An electrical inductive apparatus comprising a mag
nected together and terminals 312 and 322 would, then,
netic core, a ?rst winding including ?rst and second wind
be connected to a source of alternating current (not
ing sections disposed about a portion of said magnetic
shown) having an associated voltage rating which is
core and displaced from one another along the portion of
twice as great as for the parallel connection of the
said core, said ?rst and second winding sections each com
windings 250 and 269. It is it be noted that the wind
prising inner and outer portions each including a plurality
ing 250 as disclosed would be employed with an asso
of turns of conducting sheet material spirally wound
ciated adjacent winding disposed in similar fashion to the
around a portion of said core, the turns of said ?rst and
winding 30 shown in FIG. 1 with an interleaved construc
second winding sections being both wound in the same
tion provided in the associated winding if required.
direction, a second winding disposed in inductive rela
In summary, a winding of the second type as disclosed
tion with said ?rst winding about a portion of said core,
in FIGS. 15 through 22 does not include a crossover ar
rangement as disclosed for winding of the ?rst type but
instead provides a winding having a plurality of winding
sections each including a plurality of turns of conducting
sheet material and a layer of insulation spirally wound
together about a portion of a magnetic core (not shown)
and with the inner ends of each of the winding sections
connected together by a generally L-shaped conducting
a ?rst crossover member formed from conducting sheet
material and disposed to electrically connect the inner
portion of said ?rst winding section in series circuit rela
tion with the outer portion of said second winding sec
tion and a second cross-over member formed from con
ducting sheet material and disposed to electrically con
nect the outer portion of said ?rst winding section in
series circuit relation with the inner portion of said sec
member. An important difference between a winding of 35 ond winding section to substantially equalize the magnetic
the second type and a winding of the ?rst type as previ
coupling between each winding section of said ?rst wind~
ously disclosed is that the ?rst and second Winding sec
ing and said second Winding.
tions of the winding 250 must be wound in opposite direc~
2. An electrical inductive apparatus comprising a mag
tions because of the connection between the inner ends
netic core, a ?rst winding including ?rst and second wind
of each of the ?rst and second winding sections ZSGA and
ing sections disposed about a portion of said magnetic
250B of the winding 250.
core and displaced from one another along the portion of
It is to be understood that a winding arrangement of
said core, said ?rst and second winding sections each
the type disclosed may be provided with the start and
comprising inner and outer portions each including a plu
?nish leads disposed on either the same side of the re
rality of turns of conducting sheet material spirally
spective winding sections or on opposite sides of the re
spective winding sections. It is obvious that the shape
of the windings may be other than the generally D-shaped
cross-section disclosed. For example, the shape or" the
coil may be substantially rectangular, oval or circular
wound around a portion of said core, the turns of said
?rst and second Winding sections being both wound in
the same direction, a second Winding disposed in induc
tive relation with said ?rst winding about a portion of
. said core, -a ?rst generally Z-shaped member formed from
while still incorporating the teachings of this invention.
conducting sheet material and disposed to electrically
The connections between several windings of the type 50 connect the inner portion of said ?rst winding section in
disclosed which are disposed on di?erent winding leg
members of a common magnetic core may also be varied
from those shown in the accompanying drawings in a
series circuit relation with the outer portion of said sec
ond winding section and a second generally Z-shaped
member formed from conducting sheet material and dis
posed to connect the outer portion of said ?rst winding
may be embodied in one or more windings disposed on 55 section to the inner portion of said second winding sec~
particular application and the teachings of the invention
one or more leg portions of a common magnetic core.
It is important to note that the teachings of this in
vention may be incorporated in single phase windings
disposed on one or more leg portions of a magnetic core
tion to substantially equalize the magnetic coupling be
tween each Winding section of said ?rst winding and said
second winding.
3. A transformer comprising a magnetic core, a ?rst
or in three phase windings disposed on three or more leg 60 winding including ?rst and second winding sections dis
portions of an associated magnetic core.
posed end to end on a portion of said core, said ?rst and
. The apparatus embodying the teachings of this inven
second winding sections each comprising outer and inner
tion has several advantages. For example, a compact
winding of the type disclosed including a plurality of
winding sections each having inner and outer portions
portions each having a plurality of turns of conducting
which are interconnected by crossover members pro
vides an interleaved construction required in certain ap
and second winding sections being both wound in the
same direction, a second winding inductively disposed
plications and substantially equalizes the magnetic cou
pling between the winding sections of a ?rst winding
sheet material and an insulation layer spirally wound to
gether about a portion of said core, the turns of said ?rst
adjacent to said ?rst winding on said core portion, ?rst
and second generally Z-shaped members each formed
as disclosed and a second winding disposed in inductive 70 from conducting sheet material and disposed to elec
relation therewith to reduce circulating currents and the
trically connect the inner portion of one winding section
associated losses. In addition, a winding of the type
in series circuit relation with the outer portion of the
disclosed lends itself to convenient assembly since the
duct forming members and the insulating collar mem
bers associated with the spirally wound layer of insula~
outer portion of the other winding section to substan
tially equalize the magnetic coupling between said ?rst
and second windings.
'
scraps’?
12
ll
trically disposed adjacent to said ?rst windingon said
4. A transformer comprising a magnetic core, a ?rst
winding including ?rst and second winding sections dis
portion of saidv core, and ?rst and second generally 2
shaped members each formed from conducting sheet
material and disposed to electrically connect the inner
posed around a portion of said core and displaced from
one another along the portion of said core, a support
portion of one winding section in series circuit relation
with the outer portion of the other winding section to
rnember disposed between said ?rst winding and said
core, said ?rst and second Winding sections each corn
prising outer ‘and inner portions each having a plurality
substantially equalize the magnetic coupling between the
of turns of conducting sheet material and a layer of in
diiferent winding sections of said ?rst Winding and ‘said
second winding.
sulation spirally wound together, a plurality of insulating
collar members secured to one side of said layer of insula
tion to provide insulation between the conducting ma
terial of said winding sections and creep insulation at the
8. A transformer comprising a magnetic core, a ?rst
winding including ?rst and second winding sections dis
posed on a portion of said core and displaced from one
edges of said turns of said winding sections, the turns of
another along the portion of said core, said ?rst and sec
said ?rst and second winding sections being both wound
ond winding sections each comprising outer and inner
in the same direction, a second'winding inductively dis 15 portions each having a plurality of turns of conducting
posed around said winding, and ?rst and second cross
strip material and a layer of insulation spirally wound
over members each formed from conducting sheet ma,
together about said core, a plurality of insulating collar
terial and disposed to electrically connect the inner por~
members secured to one side of said layer of, insulation
tion of one winding section in series circuit relation with
at least at the edges thereof to additionallylinsulate the
the outer portion of the other Winding section to substan 20 turns of said winding sections from each other, a plurality
tially equalize magnetic coupling between said ?rst an
of duct-forming members secured to the other side of said
second windings.
"
layer of insulation to provide cooling ducts in said ?rst
5. A transformer comprising a magnetic core, a ?rst
winding, the turns of said ?rst and second Winding sec
winding including ?rst and second winding sections dis
tions being both Wound in the same direction, a second
posed end to end around a portion of said core, a hol
25
low cylindrical supporting member formed from elec
trically insulating material disposed between said ?rst
Winding and said core, said ?rst and second winding sec
tions each comp-rising outer and inner portions each hav
ing a plurality of turns of conducting sheet material
and a layer of insulation spirally wound together, a plu
rality of insulating collar members secured to one side of
said layer of insulation to provide insulation between the
conducting material of said winding sections and creep
insulation at the edges of said turns of said Winding sec
' ing.
9. A transformer comprising a magnetic core, a ?rst
winding including ?rst and second winding sections dis
posed end to end on a portion of said core, said ?rst
tions, the turns of said ?rst and second winding sections
and second winding sections each comprising outer and
being both wound in the same direction, a second wind
ing inductively disposed around both Winding sections of
said ?rst winding, and ?rst and second generally Z-shaped
members each formed from conducting sheet material and
disposed to electrically connect the, inner portion of one
winding section in series circuit relation with the outer
portion of the other winding section to substantially
equalize the magnetic coupling between said ?rst and
second windings.
inner portions each having a plurality of turns of conduct
ing strip material and a layer of insulation spirally wound
together about said core, a plurality of insulating collar
40 members secured to one side of said layer of insulation
to additionally insulate the turns of said Winding sections
from each other, a plurality of duct-forming members
secured to the other side of said layer of insulation to
provide cooling ducts in said ?rst winding, the turns of
said ?rst and second winding sections being both Wound
in the'same direction, a second winding inductively dis
posed concentrically about both winding sections of said
?rst winding, and ?rst and second generally Z-shaped
crossover members each formed from conducting sheet
material and disposed to electrically connect the inner
l
6. A transformer comprising a magnetic core, a ?rst
windinglincluding ?rst and secondpwinding sections dis
posed on a portion of said core and displaced from one
another along the portion of said core, said ?rst and sec
ond winding sections each, comprising outer and inner
portions each having a plurality of turns of conducting
sheet material and a layer of insulation spirally wound
together about said core, a plurality of duct~forrning
‘members secured to one side of said layer of insulation
to provide cooling ducts in said ?rst winding, the turns
portion of one winding section in series circuit relation
with the outer portion of the other winding section to
1 provide an. interleaved construction, in said ?rst winding.
10. A transformer comprising a magnetic core, a ?rst
Winding including ?rst and second Winding sections each
of said ?rst and second winding sections being both ‘
having an inner opening disposed end to end with the
wound in the same direction, a second winding concen
trically disposed adjacent to said ?rst winding, and ?rst
'inner openings substantially aligned with respect to each
other on a portion oflsaid core, said ?rst and second wind
and second crossover members each formed from con
ducting sheet material and disposed to electrically con
nect the inner portion of one winding‘ section in series
circuit relation with the outer portion of the ‘other wind
ing section to substantially equalize the magnetic cou
pling between said ?rst and second windings.
_
7. A transformer comprising a magnetic core, a ?rst
winding including ?rst and second winding sections dis
posed end to end on a portion of said core, said?rst and
second winding sections each comprising outer and inner
portions each having a plurality of turns of conducting
Winding inductively disposed concentrically about both
winding sections of said ?rst Winding, and ?rst and sec
ond crossover members each formed from conducting
sheet material and disposed to electrically connect the
inner portion of one winding section in series circuit rela
tion with the outer portion of the other Winding section
to provide an interleaved construction in said ?rst wind
a)
;ing sections each comprising outer and inner portions
each having a plurality of turns of conducting sheet r'nate- ,
rial and an insulation layer spirally would together about
a portionlof said core, the turns of'said ?rst and second
winding sections being both Wound inlthe same direction,
a second Winding inductively disposed concentrically with
respect to both of the winding sections of said ?rst wind
ing on said core portion, ?rst and second generally Z
shaped members each formed from conducting sheet mate
‘rial and disposed to electrically connect the inner portion
~ sheet material and a layer of ‘sheet insulation spirally
of one winding section in series circuit relation the outer
wound together about said core, a plurality of duct-form
ing members secured to one side of said layer of insula
; tion to provide cooling ducts in said ?rst winding, the’
‘portion of the other, Winding section to substantially
' equalize the magnetic coupling’ between said ?rst and
turns of said ?rst and second winding sections‘ being‘ both
Wound in vthe same direction, a second winding concen
second windings‘;
l
'»
11. An electrical inductive apparatus comprising a’
75' magnetic core, a-?rst winding including ?rst and second
3,074,037
13
14
winding sections disposed in end to end relation with
respect to each other about a portion of said magnetic
core, said ?rst and second winding sections each com
prising inner and outer portions each including a plurality
of turns of conducting sheet material spirally wound
of said core with the inner openings in substantial registry,
said ?rst and second winding sections each comprising
outer and inner portions each having a plurality of turns
of conducting sheet material and a layer of insulation
spirally wound together about said core, a plurality of
around a portion of said core, the turns of said ?rst and
duct-forming members secured to one side of said layer
second Winding sections being both wound in the same
of insulation to provide cooling ducts in said ?rst Winding,
direction, a second winding disposed concentrically with
a second winding concentrically disposed adjacent to said
respect to and in inductive relation with both of the wind
?rst Winding on said portion of said core, and ?rst and
ing sections of said ?rst Winding about a portion of said 10 second generally Z-shaped members each formed from
core, a ?rst generally Z-shaped member formed from
conducting sheet material and disposed to electrically
conducting sheet material and disposed to electrically
connect the inner portion of one winding section in series
connect the inner portion of said ?rst winding section in
circuit relation with the outer portion of the other wind
series circuit relation with the outer portion of said sec
ing section to substantially equalize the magnetic coupling
ond winding ‘section and a second generally Z-shaped 15 between said ?rst and second windings.
member formed from conducting sheet material and dis—
References Cited in the ?le of this patent
posed to connect electrically the outer portion of said
?rst winding section in series circuit relation with the
UNITED STATES PATENTS
inner portion of said second Winding section to substan
tially equalize the magnetic coupling between each wind 20
ing section of said ?rst winding and said second winding.
12. A transformer comprising a magnetic core, a ?rst
Winding including ?rst and ‘second winding sections each
having a generally D-shaped inner opening disposed in
spaced relation with respect to each other on a portion 25
217,466
Le Conte _____________ __ July 15, 1879
1,200,233
Preston ________________ __ Cvct. 3, 1916
1,872,247
2,441,804
Cole et al ____________ __ Aug. 16, 1932
Farry _______________ __ May 18, 1948
2,710,947
Gaston ______________ __ June 14, 1955
2,863,130
Gray et al. ____________ __ Dec. 2, 1958
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