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Патент USA US2405457

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Aug. 6, 1946.
‘A. T. ‘SINKS
2,405,457
COIL WINDING FOR ELECTRIC APPARATUS AND METHOD OF MAKING SAME
Filed 0c'b..25, 1943
Inventor-z
Allen "IT Sinks,
H15 1 Attorfney.
Patented Aug. 6, 1946
2,405,457
UNITED STATES PATENT OFFICE.
2,405,457
COIL WINDING FOR ELECTRIC APPARATUS
AND METHOD OF MAKING SAME
Allen T. Sinks, Beach Blu?, Mass, assignor to
General Electric Company, a corporation of
New York
Application October 23, 1943, Serial No. 507,419
8 Claims. (0]. 175-35s)
1
2
the top of which is mounted the terminals of the
transformer. Inside the winding space and be
tween the spaced wall members there is provid
high voltage instrument current transformer
the porcelain walls inside the pot type porcelain
manner.
of the pot type insulator employed in the con
My invention relates to a coil winding for an
struction of Fig. 1; Fig. 3 illustrates my improved
electrical induction apparatus and to a method
method of winding the high voltage winding of
of forming the coil winding.
the transformer illustrated in Fig. 1; and Fig. 4
Heretofore it has been customary to form some
types of electrical induction apparatus such as 5 is an exploded perspective view of a portion of
the high voltage Winding employed in the con
instrument current transformers with a tunnel
struction of Fig. 1.
type porcelain body which includes a tubular
Referring more particularly to Fig. 1 of the
shaped inner wall and a spaced outer wall form
drawing, I have illustrated an electrical induction
ing a winding space. The outer Wall usually ex
tends into a relatively long tubular member on 10 apparatus which has particular application as a
which includes a pot type insulator II) having a
cavity II, at the bottom of which there is pro
vided a tubular shaped wall I2 and a spaced bot
ed a few turns of wire to form the primary wind
ing of the transformer. Through the tunnel on 15 tom wall I3 providing a winding space Ill. The
tubular shaped wall I2 is hollow so as to provide
the outside of the porcelain is placed the core
an opening or tunnel I5 through which extends
winding leg and the low voltage secondary wind
a winding leg I6 of a core in the conventional
ing. It will be understood that the space between
The core is formed in two halves with
is relatively narrow and some difliculty has been 20 an outer yoke portion I‘! which connects with
experienced in the past in winding the conduc
tor around the inner porcelain body to provide
the high voltage winding. This has usually been
accomplished by taking an insulated conductor
half of the winding leg I 6. The other half of
the winding leg I6, it will be understood, con
as to produce the high voltage winding. How
ever, such prior methods have been susceptible of
the pot type insulator through a metallic ?ange
member I9 which is in turn attached to the in
cracking or injuring the relatively hard surface
sulator in any suitable manner such as by ce
nects with a yoke similar to I‘! and on the oppo
site side of the transformer. A base member I8
and working it around the inner body a su?icient 25 of suitable metallic material is provided which
surrounds the core members and which supports
number of times to form a plurality of turns so
menting, as is indicated at 20. The top of the
cavity I I is closed through a cover member 21
ally rather tedious and expensive.
which is attached to the top of the insulator
It is therefore an object of my invention to
through a collar 22 which is in turn supported by
provide an improved high Voltage primary wind
a shoulder 23 of the insulator and is cemented,
ing for a pot type current transformer of the
35 as is illustrated by the numeral 24. A pair of
above mentioned type.
terminals 25 and 26 are provided on the cover
A further object of my invention is to provide
which in turn connect to the high voltage pri
an electric induction apparatus with an improved
mary winding, the construction of which will be
coil winding which is simple in construction and
described below. Low voltage terminals 21 are
e?icient in operation.
provided which are supported by the base I8
A still further object of my invention is to pro
which are connected to a low voltage winding
vide an improved method for facilitating the
28 through a conductor 29. The low voltage
forming of a high voltage Winding around a tu
winding 28 surrounds the winding leg and is in
bular body in the cavity of a pot type insulated
side the tunnel I5.
transformer.
In order to provide an improved high voltage
Further objects and advantages of my inven 45
winding arrangement, I provide a spool member
tion will become apparent from the following de
30 which is split and which is formed of two semi
scription referring to the accompanying drawing,
cylindrical portions 3I and 32, as will be seen in
and the features of novelty which characterize
detail in the exploded View of Fig. 4. These mem
my invention will be pointed out with particu
larity in the claims annexed to and forming a 50 bers may be made of any suitable material and
of the porcelain and such prior methods are usu
part of this speci?cation.
In the drawing Fig. l is a side elevation in par
tial section illustrating a pot type instrument
transformer which is provided with an embodi
ment of my invention; Fig. 2 is a perspective view
are formed of conducting material such as cop
per for the reasons which will be apparent as the
following description proceeds. The semi-cylin
drical members 3| and 32 are placed around the
' tubular inner wall I2, as is illustrated in Figs. 1
2,d05,457
e)
4
and 3, with the abutting surfaces 33 slightly
spaced and the surfaces as abutting. Suitable
dowel pins
which extend into holes 36 may be
provided fOr properly positioning the semi-cylin
drical members. In order that the spool will not
of the rod 50 extends. The top- suriace of the
tubular member 53 may be supported in any suit
able manner, such as through a base 66 which in
turn supports the rotatable wheels 65 which in
turn cause the chains 46 to rotate.
My improved method of forming the high volt
provide a short-circuited turn around the Wind
age winding around the tubular wall 12 at the
ing legs, the split spool is provided with a' longi
bottom of the cavity of a pot type insulator, there
tudinal or axial discontinuity in the form of an
fore, includes the steps of surrounding the tubu
insulating member 37 which is placed between
the adjacent surfaces at 33.
10 lar wall with the split spool with the conductor
In order to provide a convenient arrangement
for winding a conductor around the spool to pro
attached. The chain is then assembled for rotat
ing the spool. A suitable amount of thrust is
thereby provided through the thrust member 59 so
that when the spool is rotated it will move rela
vide the high voltage winding, each of the semi
cylindrical portions 3! and 32 forming the spool
is provided with spaced ?anges 38 and 39 which 15 tively freely around the outer surface of the wall
i2. After a suitable number of turns have been
have gear teeth [it formed about the outer pe
placed on the spool, the conductor may be cut
riphery thereof. Any suitable conducting mate
and an end 55 attached to a conductor 55 which
rial may be provided for the high voltage wind
ing and in the construction illustrated it will be I in turn connects to the terminal 25 or the con
seen that the high voltage conductor is in the 20 duotor M may continue up to and be attached
to the terminal 25.
form of a relatively wide and thin copper strip
In order to provide the high voltage winding
4| which is wound off a suitable spool of the ma
with another terminal, the terminal 26 is con
terial 42. An end of the copper conductor 4| is at
nected to the inner end of the high voltage wind»
tached to the spool in any suitable manner, such
as by welding, as is indicated by the numeral 43. 25 ing through the spool. This may be accomplished
in any suitable manner such as by providing a
This connection may be made between the con~
conductor lead 56' which has an inner end brazed.
duotor and the member 3! before the semi-cylin
to the spool. It will be seen, particularly in Fig.
drical members are inserted in the porcelain.
4, that both the semi-cylindrical members have
wound on the split spool, the semi-cylindrical 30 on each of the ?anges relatively flat portions 57
and, in order to facilitate the connection, a strap
members will be held together by the conductor.
member 53 may be provided which bridges across
As the spool is wound up, interturn insulation
the ?at portions 57!. The strap 53 has depending
may be provided between the turns of the con~
legs 59 of suilicient length, which. is slightly
duotor by a suitable sheet of insulating material
114 which is wound off a spool 45.
35 longer than the thickness of the high voltage
winding, so the outer convolutions will not touch
In order to rotate the spool around the inner
the strap member 58 or are across during opera
wall !2, I provide chain members 46 which mesh
tion. Taped holes are provided in the flat por
with the sprockets or teeth Iii! on the peripheral
tions 51, and suitable screws 50 attach the strap
flanges of the spool. It will be understood that a
pair of continuous chains may be employed which 40 member to the axially spaced ?anges of the semi
cylindrical portions 3!. This strap member pro—
mesh with each of the sprockets lit, only one of
vides a convenient place for attaching an end 5!
which, however, is shown in Fig. 3. It is also
of the conductor 55, as is illustrated in Fig. 1.
to be understood that chains cooperate with suit
It will be understood that the screws may be at
able tooth wheels 55 which may be rotated by a
Also, as soon as one turn of the conductor is
suitable source of power (not shown) so as to
rotate the spool. Thus by rotating the spool the
tached to the flat portions 51 by inserting a screw
driver in the opening H of the porcelain when
the spool is in position with the flat portions 51
copper conductor 4! with its insulation 44 will be
facing upwardly. After the strap is assembled.
wound around the tubular portions of the semi
the spool may be rotated a quarter of a turn so
cylindrical members 3! and 32, thus providing a
continuous coil of concentric convolutions. It is 50 that the leads are attached to the winding sub
stantially symmetrically. In. order to hold the
to be understood that the spool is su?iciently large
high voltage winding snugly in the porcelain
so as to be able to rotate around the outer surface
after assembly of the winding, a suitable ?lling
of the wall l2 and, to indicate this, there is shown
compound may be put in the cavity H, as indi
a slight clearance between the wall l2 and spool
39.
55 cated by the line 62.
Although I have shown and described particu
In order to minimize binding between the inner
lar embodiments of my invention, I do not desire
surface of the spool and the outer surface of the
to be limited to the particular embodiments de
wall 92, I provide a thrust member 59 which in
scribed, and I intend in the appended claims to
cludes a rod having a pair of rollers 59 and 52
which roll on the outer surface of the spool and 60 cover all modi?cations which do not depart from
the spirit and scope of my invention.
on the convolutions of the conductor as the con—
What I claim as new and desire to secure by
duotor is wound around the spool. Thus as the
Letters Patent of the United States is:
chain is rotated to produce a torque which in turn
1. An electrical induction apparatus including
rotates the spool, the spool will tend to be forced
a pot type solid body of insulating material hav
upwardly against the bottom surface of the wall
integral inner tubular shaped wall and
E2. Such rubbing, however, might tends to crack
an integral outer wall spaced from said inner
or injure the porcelain and in order to prevent
wall providing a winding space between. said
this, the thrust member 563 with the rollers is
walls, a split spool of conducting material loosely
provided which pushes downwardly with a force
which may be made substantially equal to the 70 surrounding said inner wall, a conductor wound
around said spool with the inner end attached
upward force of the chain, thus allowing the spool
to said spool, a pair of terminals, and means for
to rotate relatively freely around the outer sur
connecting one of said terminals to said spool
face of the wall member Hi. This force is ac
complished through a spring member 52' which
and the other of the terminals to the outer turn
is inside a tubular member 53 into which an end 75 of said wound conductor.
2,405,457
5
2. An electrical induction apparatus including
a solid ‘body of insulating material having a tu
bular inner wall and a spaced outer Wall provid
ing a winding space, a spool of conducting mate
rial surrounding said inner wall, a conductor
wound around said spool to form a winding,
means for connecting the inner end of said con
6
to form a winding, said spool having axially
spaced ?anges, means including gear teeth
formed about they outer periphery of said ?anges
for rotating said spool around said tubular Wall
for forming said winding, and means for attach
ing the inner end of said conductor to said spool.
6. An electrical induction apparatus including
a body of insulating material having a tubular
ductor to said spool to form one terminal portion
inner wall and a spaced outer wall providing a
for said winding, and means for connecting a
conductor to the outer turn of said winding to 10 winding space, a pair of semi-cylindrical mem
bers of conducting material loosely surrounding
form another terminal.
said inner wall to form a winding spool, a con
3. An electrical induction apparatus including
ductor Wound around said spool to form a wind
a solid body of insulating material having a tubu
ing, said spool having axially spaced ?anges,
lar inner wall and a spaced outer wall providing
a winding space, a split spool of conducting ma 15 means including gear teeth formed about the
outer periphery of said ?anges for rotating said
terial loosely surrounding said inner wall, a con
‘spool around said tubular Wall for forming said
ductor wound around said spool to form a wind
winding, and means for attaching one end of
ing, said split spool having an axially extending
said conductor to said spool, a conducting bar
discontinuity so that it will not form a short
circuited turn, one end of said conductor being 20 bridging said ?anges of said spool, a terminal,
and means for connecting said terminal to said
attached to said spool so that said spool forms
bar.
.
one terminal portion for the winding.
7. A winding for an electrical induction appa
4. An electrical induction apparatus including
ratus including a spool of conducting material,
a body of insulating material having a tubular
inner wall and a spaced outer wall providing a 25 a conductor wound around said spool in layers
with the inner end connected to said spool, means
winding space, a, pair of semi-cylindrical mem
including said spool for providing one terminal
bers of conducting material loosely surrounding
connection for said winding, said spool having
said inner wall to form a winding spool, means
spaced ?anges with gear integral teeth on the
for insulating adjacent surfaces of said members,
outer periphery thereof to provide means through
a conductor wound around said spool to form a
which said spool may be rotated to wind on said
winding, said spool having axially spaced ?anges,
conductor.
means including gear teeth formed about the
8. A method of forming a coil winding around
outer periphery of said ?anges for rotating said
a tubular wall at the bottom of the pot type in
spool around said tubular wall for forming said
winding.
5. An electrical induction apparatus including
a body of insulating material having a tubular
inner wall and a spaced outer wall providing
sulated transformer including the steps of plac
ing two semi-cylindrical metallic members in the
cavity around the tubular wall to form a wind
ing spool, placing a chain in the cavity around
the spool for rotating the spool, rotating the
a winding space, a pair of semi-cylindrical mem
bers of conducting material loosely surrounding 40 spool, and placing a thrust member in the cavity
and against the spool to prevent the spool from
said inner wall to form a winding spool, means
binding on the wall during rotation of the spool.
for insulating adjacent surfaces of said members,
a conductor wound around said spool in layers
ALLEN T. SINKS.
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