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Патент USA US3091754

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May 28, 1963
F. c. OWEN
3,091,744
TRANSFORMER WITH MAGNETIC LEAKAGE SHIELD
Filed March 16, 1962
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INVENTOR.
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Frea’en'ck C. Owe/7
BY
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May 28, 1963
F. c. OWEN
3,091,744
TRANSFORMER WITH MAGNETIC LEAKAGE SHIELD
Filed March 16, 1962
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INVENTOR.
Frederick C‘. Owen
BY
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ATTORNEY
May 28, 1963
F. c. OWEN
3,091,744
TRANSFORMER WITH MAGNETIC LEAKAGE SHIELD
Filed March 16, 1962
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INVENTOR.
Freder/ck C. Owe/7
BY
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ATTORIVE 6
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3,91,?44
Patented May 28, 1963
22
of the invention, particularly showing a modi?ed arrange
ment of adjustable shunt;
FIG. 10 is a fragmentary front elevational view similar
to FIG. 9, showing a modi?ed construction of the adjust
3,091,744
TRANSFGRMER WITH h/iAGNETHC
LEAKAGE SHIELD
Frederick C. Owen, 206 Fenton Place, Charlotte, N11.
Filed Mar. 16, 1962, Ser. No. 180,257
able shunt of FIG. 9; and
FIG. 11 is a diagrammatic view of the modi?ed struc
ture of the invention as shown in FIGS. 9 and 10 and
showing in electrical schematic one arrangement of trans
12 Claims. (Cl. 336--87)
My invention relates broadly to transformers and more
former windings; applicable to the teachings of the inven
particularly to high magnetic leakage-type transformers
having magnetic leakage shields.
10 tion.
Referring to the form of invention shown in FIGS.
1-8, and particularly to FIG. 8, wherein one arrangement
of transformer winding applicable to the teachings of the
invention has been shown in electrical schematic, the
laminated core of the transformer is generally designated
One of the objects of the invention is to provide shield
ing means for high magnetic leakage-type transformers to
enable the same to be encased within a metal container.
Another object of the invention is to provide a con
struction of high magnetic leakage-type transformer in
which the magnetic leakage is diminished and con?ned,
by the reference numeral 1. The laminated core struc
ture of conventional construction and consisting of a plu
thus enabling such transformers to be used in the vicinity
rality of stacked laminae of magnetic material, secured
together with insulated bolts 17 or the like, is generally
Another object of the invention is to provide a con 20 rectangular in shape having ‘end portions 2 and 3, and
a central portion 4 disposed intermediate the end portions
struction of high magnetic leakage-type transformer in
2 and 3‘ and spanning the side portions 5 and 6 which
which the magnetic leakage flux is conserved and utilized
respectively connect corresponding ends of the end por
for varying the transformer output current.
of other electrical equipment without adversely affecting
the same, a feat heretofore unattainable.
Still another object of the invention is to provide a
construction of transformer with a magnetic leakage shield,
in which the shield is provided with a transformer output
current control system.
tions.
'
The illustrated arrangement of transformer windings
on the various portions of the transformer core is basically
that shown and described in Patent 2,365,722, issued to
me on December 26, 1944, for Tarnsformer, although
A further object of the invention is to provide a con
struction of transformer with a magnetic leakage shield
having ?uxv diverting means for varying the transformer
output current from maximum to minimum and mini
mum to maximum with very little effort.
Still a further object of the invention is to provide a
construction of welding transformer having a magnetic
leakage shield with means for varying the welding trans
former output current to affect the welding arc voltage but
which will not affect the open circuit voltage.
FIG. 8 illustrates the transformer in a more simpli?ed
form. The transformer shown is an electric welding trans
former; however it is to be understood that the teachings
of the invention are applicable to a variety of different
transformers of the high magnetic leakage type, having a
variety of winding arrangements, and the arrangement
shown in FIG. 8 is only for purposes of illustrating one
such form of high magnetic leakage type transformer to
which the teachings of the invention are applicable.
Primary transformer winding 7 having its input leads
Other and further objects of the invention reside in
the construction of and manner of manipulating the shunt
connected to a conventional alternating current power
device extending intermediate the magnetic leakage shield 4-0 source, as indicated, of approximately 110 volts or other
desired rating, is wound on core end portion 3‘ while the
and core in both the preferred and modi?ed forms of the
invention as set forth more fully in the speci?cation here
main secondary windings 8 and 9 are respectively wound
on end portions 3 and 2. An auxiliary secondary Wind
inafter following by reference to the accompanying draw
ing indicated at in is ‘wound on central portion 4 of the
ings, in which:
FIG. 1 is a front elevational view of the transformer 45 core and is provided with a plurality of taps lit which
are adapted for selective electrical connection with the
and magnetic leakage shield of the invention;
movable tap or plug 12 connected to one end of main
FIG. 2 is a side elevation‘ view of the magnetic leakage
secondary winding a, while the other end of winding 9
shield and particularly showing the rack gear shunt adjust
ment mechanism;
is connected to the ‘WOI‘iC 13 in accordance with the usual
practice. The secondary transformer circuit is compelted
by connection of the other end of auxiliary secondary
winding it} with one end of main secondary winding S,
FIG. 3 is a top plan view of the structure of FIGS.
1 and‘ 2;
FIG. 4 is an enlarged sectional view taken substantially
along line 4-4., of FIG. 1, with parts broken away to
show the manner in which the magnetic shield is secured
together;
with the opposite end of winding 3 connected to the weld
ing electrode holder 14. The adjustable tap arrangement
55
of the auxiliary secondary winding provides convenience
in selection of the open circuit voltage, the amperage
output of the transformer and the welding arc voltage.
A condenser winding 15 having its extremities con
FIG. 4A is an enlarged cross sectional view taken sub
stantially along line 4A-4A of FIG. 1 and particularly
showing the construction of the optional second shunt;
nected across a bank of capacitors id is wound on core
FIG. 5 is an enlarged fragmentary cross sectional view
taken substantially along line 5-—5 of, FIG. 3, and par 60 end portion 2 either under or over main secondary wind
ing 9. In like manner main secondary winding 8 is wound
either over or under primary winding 7 but for purposes
of illustration the secondary windings 8 and §‘ have been
shown wound, over primary winding 7 and condenser
ticularly showing the adjustable shunt mechanism;
FIG. 6 is an enlarged, fragmentary’ top plan view similar
to FIG. 3‘ but showing a modified construction of shunt
adjustment mechanism;
FIG.'7 is a fragmentary cross sectional view taken
substantially along line 7—7' of‘FIG. 6;
FIG. 8' is a diagrammatic view of a, transformer and
shieldembodying the features of the invention and show
65
winding 15, respectively. The capacitors 116 function to
increase the power factor of the input current and act
to increase or decrease the frequency of the secondary
or welding current, depending upon the size and number
of capacitors employed since they are part- of an inde
ing one arrangement of transformer. windings applicable 70 pendent oscillating circuit. consisting of the capacitance
to. the invention;
and its exciting winding, and» enable the operator to main
,FIG. 9 is a front elevational' view of a modi?ed form
tain, the welding current are as constant as possible as set
3,091,744
3
4
forth in greater detail in the beforementioned Patent
tion to form a guide for the magnetic shunt, and are
2,365,722. Thus this transformer arrangement produces
disposed in guiding engagement with magnetic shunt in
an ideal are for vertical, overhead and flat horizontal
sulation sheet 29 as the shunt is moved in the apertures
welding of all types of metals.
The magnetic leakage shield, indicated generally at 18,
netic material, such as iron, and having substantially
relative to the guide plates. Support members 34 se
cured to guide plate 30 by welding, or other suitable
means, extend outwardly therefrom and provide guide
member 35 on their outward extremity for slidably en~
the same number of laminae as the transformer core 1,
gaging rack gear 36 securely connected to guide block
is supported in spaced relation about the perimeter of the
27 at one end of the magnetic shunt assembly. Gearing,
and comprised of a plurality of stacked laminae of mag
laminated transformer core by means of insulating blocks 10 indicated at 37, journaled for rotation on support mem
19. The magnetic leakage shield is thus generally rec
tangular in shape having the core of a high magnetic
leakage ?ux transformer supported interiorly thereof.
Angle iron frames 29 and 21 are disposed about the
bers 34 and selectively controlled by hand knob 38, or
other suitable means, is disposed in meshing engagement
relation as shown particularly in FIGS. 2, 3 and 4 and
are connected together by means of insulated bolts 22,
It is to be understood that the magnetic shunt could
just as easily be positioned at the bottom of the trans
former intermediate core side portion 6 and the mag
with rack gear 36 such that the shunt 25 is moved in
wardly or outwardly with relation to the guide plates
perimeter of the magnetic leakage shield in cooperating 15 3% and ‘31 upon turning of hand knob 38.
or the like, to securely clamp together the plurality of
laminae comprising the ‘magnetic leakage shield. As
netic shield.
At the bottom of the transformer a sec
shown, the arms of angle iron frames 20 and '21 engage 20 ondary or auxiliary shunt is provided as indicated at 39,
comprising a plurality of laminae of magnetic material
the face and edge portions of the magnetic shield laminae
securely clamped between end members 40 of insula
and are insulated therefrom by means of insulation mem
tion ‘material, thus being of substantially the same con
bers 23 and 24 which extend around the entire perimeter
struction as the previously described adjustable magnetic
of the magnetic shield intermediate the laminae and the
angle iron frames. Thus the insulation members 23 and 25 shunt 25. The auxiliary magnetic shunt 39 is clamped
in place beneath central portion 4 of the transformer
2e and insulation bolts 22 prevent any short circuit of the
core intermediate side portion 6 and the magnetic shield
magnetic ?ux paths within the magnetic leakage ?ux
18 ‘by means of shunt support plate members 41 clamped
shield structure.
in frictional engagement with angle iron frames 20 and
In the preferred form of the invention the top portion
of the magnetic shield is spaced a greater distance from 30 21 by means of insulation bolts 42 passing through said
support plates, shunt end members 40 and the auxiliary
the top portion 5 of the transformer core than the other
shunt laminae, as particularly shown in FIGS. 1 and 4A
portions of the magnetic shield from the corresponding
with the top portion of the auxiliary magnetic shunt dis
portions 2, 3 and 6 of the transformer core.
posed in abutting engagement with the bottom surface
A magnetic shunt or ?ux diverter, indicated generally
at 25, and consisting of a plurality of laminae 26 of mag 35 of core side portion 6 and an air gap between the mag
netic shield and the bottom surface of the auxiliary shunt.
netic material of substantially the same number as pro
If tolerances are very close it may be necessary to insert
vided in the magnetic shield structure and transformer
a sheet of insulation material between the auxiliary shunt
structure, securely clamped between guide blocks 27 of
and the magnetic shield.
insulation material by means of insulated bolts 28 or the
Although I have illustrated the auxiliary shunt 39 as
like, is positioned intermediate the magnetic shield 18 40
being ?xed in position, this shunt could also be selectively
and transformer core portion 5, as shown more particu
adjustable in a manner similar to the main magnetic
larly in FIGS. 1 and 5. The laminae 21’) of the flux di
shunt or ?ux diverter 25. It is also to be understood that
verter 25 are disposed in alignment with the laminae of
this shunt could be completely eliminated thus provid
the magnetic shield and transformer core with each lami
nae having substantially the same Width as central portion 45 ing the structure with only a single magnetic shunt. The
4 of the transformer core. The top portion of magnetic
shunt 25 is disposed in sliding engagement with the ad
jacent bottom portion of the magnetic shield 18 and a
sheet of insulation material 29 secured to the bottom of
the magnetic shunt is disposed in sliding engagement with
the top surface of side portion 5 of the transformer core.
Provision for the insulation sheet 29 intermediate the
magnetic shunt and the transformer core is necessary in
order to prevent short circuit of the magnetic ?ux paths
?xed magnetic shunt 39 is utilized for limiting the maxi
mum current output of the secondary Welding trans
former circuit and although the auxiliary shunt illus
trated has been shown to contain substantially the same
number of laminae as the magnetic shield and trans
former core, the number of laminae can be reduced to
vary the length of the auxiliary shunt to thus vary the
maximum transformer current output. The maximum
current output is increased as the number of laminae of
55
magnetic material are decreased in the auxiliary shunt
between the shield and the core.
assembly. If a sheet of insulation material is inserted
The magnetic shunt or ?ux diverter 25 is disposed
between the auxiliary shunt and the magnetic shield the
to be selectively positioned in a plane normal to the plane
thickness of insulation will also affect the magnetic shunt
of the laminae of the various members such that the
path and cause an effect on the transformer output cur
laminae 26 of the magnetic shunt may be disposed in
alignment with all of the corresponding laminae of the 60 rent.
Although the theory of operation is not completely
shield and transformer core, or may be selectively posi
known, it has been found that through experimentation
tioned to be disposed in alignment with only a selected
with the device of the invention, the welding arc current
number of the laminae of the shield and transformer
may be easily varied by the operator from minimum to
core, as shown more particularly in FIG. 5, thus reduc
maximum and from maximum to minimum by adjustment
ing the area of the magnetic shunt ?ux path intercon
of the main magnetic shunt or ?ux diverter 25. If an
necting the shield and core. The angle iron frames 20
auxiliary shunt 39 is utilized the maximum current is set
and 21 are appropriately notched to allow free move
by this shunt and the welding current can thus be varied
ment of the magnetic shunt toward and away ‘from the
from a minimum to this set maximum by the main shunt
shield and core. A pair of guide plates 30 and 31, hav
ing rectangular apertures therethrough, indicated gener 70 25. The highest welding output current in the trans
former secondary circuit is experienced when the mag
ally at 32, of a size somewhat larger than the cross sec
netic shunt 25 is positioned in its maximum outwardly
tional area of the magnetic shunt, are clamped together
adjusted position, as indicated in phantom in FIG. 2,
outwardly of angle iron frame members 20 and 21, re
where it forms no coupling ?ux path between the magnetic
spectively, by means of insulation bolts 33, such that
their corresponding apertures are disposed in registra 75 shield and the transformer core. Conversely, the mini
3,091,744
5
6
mum welding current is experienced when the magnetic
is substantially different. The laminated transformer core
1’, of generally rectangular shape, is comprised of end
portions 48 and ‘49, bottom portion 50 connecting cor
responding ends of said end portions, and top portions 51
shunt 25 is positioned at its. other extreme, so that it lies
completely between guide plates 30 and 31, as indicated
in full lines in FIGS, 2 and 3, to form the maximum ?ux
path intermediate magnetic shield 18 and transformer core
1. As stated, the theory of operation is not completely
and 52 respectively connected to the opposite ends of end
known but the laminated magnetic shield 18 apparaently
portions 48 and 49, and being separated by an air gap
indicated generally at 53 through which passes the adjust~
functions somewhat like a transformer core, providing a
able magnetic shunt 25’.
con?ning flux path for the magnetic leakage ?ux, and thus
The adjustable magnetic shunt or flux diverter com
conserves the magnetic leakage flux from the high mag 10 prises a plurality of elongated rectangular shaped laminae
netic leakage ?ux type transformer. The shield thus
54 of magnetic material of substantially the same num
reduces the flux leakage from the assembly, enabling the
ber and arranged in the same plane as the laminae of the
transformer and the shield to be placed within a metal
magnetic shield and transformer core, secured together
case without short circuiting the transformer. By insert
at their uppermost ends by means of a properly insulated
ing the magnetic shunt between, the shield and the trans
clamping member and insulated bolt assembly, indicated
former core the leakage flux is diverted back to the trans
generally at 55, with the lower ends of the laminae 54
former and provides control for the transformer output
terminating in the sheet of insulation material 56 secured
current. By selectively Varying the shunt, the transformer
thereto by means of adhesive or other suitable means.
input current, output or welding arc current, and the weld
The transformer auxiliary secondary winding 10 is dis
ing arc voltage are varied. However, the manipulation 20 posed in ?xed position relative to the transformer and the
magnetic shunt 25’ is disposed through an opening; 57
of the shunt has no effect whatsoever on the open circuit
voltage of the welding transformer, that is, the voltage
provided in the top surface of the magnetic shield 18 as
across the secondary before the electrode welding arc is
shown in FIG. 11, through the air gap 53 of transformer
struck Thus, by using the teachings of the invention with
core 1’ such that it is in sliding engagement with the
the transformer shown in FIG. 8, the open circuit voltage 25 terminating ends of the core top portions 51 and 52 and
can be maintained at a minimum for operator safety, and
extends downwardly through the ?xed auxiliary secondary
when the welding arc is, struck the arc current can be
transformer winding 10 with the insulation sheet 56 con
easily adjusted from maximum to minimum or converse
tacting ‘bottom portion 50 when the magnetic shunt is in
its lowermost position as indicated in full lines in FIGS.
ly by means of the adjustable magnetic shunt. Magnetic
leakage from transformers of the high magnetic leakage
?ux type causes heat losses and loss of secondary power,
30 9-11.
The opening 57 in the magnetic shield 18 is of
su?iciently larger size than the cross sectional area of‘ the
and these losses are diminished by use of the magnetic
magnetic shunt so that no contact whatever is made be
leakage shield arrangement of the invention.
tween the magnetic shunt 25' and magnetic ?ux leakage
A modi?ed construction for adjusting the magnetic
shield 18, to thus eliminate the possibility of short circuit
shunt or ?ux diverter 25 is shown in FIGS. 6 and 7, where 35 ing of the magnetic flux paths between the shield and
in lieu of a rack and pinion gear arrangement for selec»
core. Depending upon manufacturing tolerances it may
tively adjusting the shunt intermediate the magnetic shield
be necessary to provide an insulation gasket around the
edges of opening 57 .
and transformer core, a screw 43 is provided, journaled
for rotation within bracket 44 connected to guide block 27
A supporting tower arrangement, comprised of angle
of the magnetic shunt, and disposed in screw threaded 40 members 58 connected to the top surface of angle iron
engagement with guide member 45 supported at the ex
frames 20 and 21, by welding or other suitable means,
tremites of the support members 46 which in turn are
extends upwardly from the top surfaces thereof terminat
secured, in the same manner as support members 34 in
ing in a guide member 59 of electrical insulation material.
the main form of the invention, to the guide plate 30. A
The supporting tower ‘arrangement supports the adjusting
crank portion 47, or other suitable means such as a 45 mechanism for the magnetic shunt to enable it to be selec
handwheel or the‘ like, is connected to the outward end
of screw member 43, whereupon rotation of the crank 47
tively raised and lowered, with the lowermost position of
the shunt being shown in full lines in the various views
causes the adjustable shunt or magnetic ?ux diverter 25
and the partly raised position of the shunt being shown
to be selectively positioned in the desired manner inter
in phantom in FIG. 10. It is to be understood that in
mediate the magnetic shield and transformer core in the 50 the uppermost position the end of the shunt» 25’ is posi
same manner as explained in connection with the preferred
form of the invention.
tioned flush with the bottom edge of magnetic shield 18
so. there, is an air gap between the bottom of the shunt
Another modi?ed form of the invention is shown in
and the transformer core. In this ‘fully raised position,
FIGS. 9~1l wherein the construction of the magnetic
the secondary output current or welding arc is at its
shield 18 clamped within angle iron frame members 20 55 ‘maximum with the minimum welding current being pro
and '21 is the same as that indicated in the preferred
vided when the shunt is in its lowermost position.
embodiment of the invention with the shield spaced from
As with the preferred form of the invention, various
the perimeter of the transformer core 1' by insulation
means can be provided for raising and lowering the mag
blocks I9 in the manner previously described. It should
netic shunt or flux diverter 25', and in FIG. 9 I have shown
be noted that the insulation blocks are disposed to support 60 an arrangement of crank and screw 43’, 44' and 47',
the weight of the transformer core and other clamping
which operates in the same manner as the crank and screw
means may be provided for maintaining the core in posi
mechanism of FIGS. 6 and 7, and in FIG. 10 I have shown
tion Within the magnetic shield. In the preferred form of
an arrangement of rack and pinion gearing 36' and 37’,
the invention, as shown in FIG. 1, other clamping means
which operates in a manner similar to the gearing of FIG.
are not necessary as the guide plates 30 and 31 and the 65 5, for selectively raising and lowering the adjust-able shunt
shunt support plate members 41 serve as clamping means
to obtain the desired secondary output current for the
between the core and the shield to maintain the trans
former core within the shield.
In the modi?ed form of the invention shown in FIGS.
welding process.
ponents. However, the construction of the transformer
output current to vary in the same manner as experienced
It should be understood that an auxiliary shunt 39.
as described with the preferred form of the invention, can
9~l1, I have shown the adaptation of the modified con 70 also be used with this modi?ed structure if it is desired
struction to the same transformer winding arrangement
to limit the maximum output current to a certain value.
as shown in the preferred form of the invention with
Raising and lowering the shunt 25', of the form of the
like reference numerals indicating corresponding com
invention shown in FIGS. 9-11, cause the transformer
core‘ 1’ and adjustable magnetic shunt or ?ux diverter 25 75 with corresponding adjustments of the shunt 25 in the
3,091,744
8
7
preferred form of the invention, by diverting the trans—
former magnetic leakage ?ux back to the transformer
core, thus coupling the flux with the transformer windings,
and it therefore appears that the theories of 'operation
said flux diverter means is moved from a position interme
diate the transformer and shield means.
9. A transformer comprising a core formed with an
for both forms are substantially the same.
While I have described my invention in certain of its
intermediate leg to divide the core into sections, a primary
winding wound on one section of the core, a capacity
exciting winding wound on the other section of the core,
preferred embodiments, I realize that modi?cations may
both of said windings being excluded from said intermedi
ate leg to inductively isolate the two, a secondary winding
wound on both sections of the core to inductively couple
imposed by the scope of the appended claims.
10 both of the ?rst said windings when the secondary is
under load, magnetic leakage ?ux shield means supported
What I claim as new and desire to secure by Letters
in spaced relation about the perimeter of said core, and
Patent of the United States is as follows:
?ux diverter means connected for movement above the
1. A transformer comprising, a core member, induc
intermediate leg intermediate said core and said shield
tively related transformer windings wound on said core
member, magnetic leakage ?ux shield means disposed 15 means for selectively varying the secondary output cur
rent when the secondary is under load.
about the perimeter of said core member in spaced rela
10. A transformer as set forth in claim 9‘ and a second
tion, and separate means connected intermediate said
?ux diverter means beneath the intermediate leg and con
core member and said shield means for forming a mag
nected intermediate said core and said shield means.
netic ?ux path between said shield and said core mem
11. In combination with a transformer having a nor
ber and setting the transformer output current.
20
mally low power factor and including a primary and
2. A transformer as set forth in claim 1 in which a gap
secondary, a reactance of a character to materially im
is provided in the magnetic flux path intermediate said
prove the power factor, an energizing winding for the
separate means and said core member.
reactance inductively related to the secondary to auto
3. A transformer as set forth in claim 1 in which a
be made, and I desire that it ‘be understood that no limita
tions upon my invention are intended other than may be
gap is provided in the magnetic flux path intermediate 25 matically render the reactance effective only when the
secondary is under load, magnetic leakage ?ux shield
said separate means and said magnetic leakage ?ux shield
means disposed in spaced relation about the perimeter of
means.
4. In combination with a transformer having a primary
the transformer, and selectively adjustable means con
nected intermediate the transformer and said shield means
and secondary, magnetic leakage flux shield means sup
ported in spaced relation about the perimeter of the trans 30 for varying the output current when the secondary is
under load.
former to con?ne the magnetic leakage ?ux ?eld, and
flux diverter means connected intermediate the shield
means and transformer for selectively setting the trans—
former output current when the secondary is under load.
12. A transformer comprising a core formed with an
air gap on one side thereof to divide the core into sec
tions, a primary winding wound on one section of the
5. In combination with a transformer having an induc 35 core, a capacity exciting winding wound on the other
tively related primary and secondary, magnetic leakage
?ux shield means supported in spaced relation about the
perimeter of the transformer forming a con?ning ?ux path
for the transformer leakage ?ux, and ?ux diverter means
connected for movement intermediate the transformer 40
and shield means and being selectively positionable be
tween two extreme settings for varying the transformer
output current between a selected minimum and maxi
section of the core, a secondary winding wound on both
sections of the core to inductively couple both of the
?rst mentioned vwindings when the secondary is under
=load, magnetic leakage ?ux shield means supported in
spaced relation about the perimeter of said core and
formed with an aperture in registration with the core air
gap, and selectively adjustable ?ux diverter means ex
tending through the aperture of said shield means and
the core air gap and being connected for movement rela
mum when the secondary is under load.
6. The combination as set forth in claim 5 in which 45 tive thereto for selectively varying the secondary output
said ?ux diverter means is selectively positionable in a
current when the secondary is under load.
plane normal to the plane of the transformer and shield
References Cited in the ?le of this patent
means.
7. The combination as set forth in claim 5 in which said
UNITED STATES PATENTS
?ux diverter means is selectively positionable in the plane
of the transformer and shield means.
8. The combination as set forth in claim 5 in which
maximum transformer output current is approached when
2,311,128
2,555,911
2,671,196
Ranney ______________ __ Feb. 16, 1943
Anderson _____________ __ June 5, 1951
Owen ________________ __ Mar. 2, 1954
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