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Патент USA US3020425

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Feb. 6, 1962
l. K. DORTORT
3,020,415
CURRENT BALANCING REACTORS
Filed April 25. 1959
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3,026,415
United States Patent Ü 'ice
Patented Feb. 6, 1962
2
1
3,020,415
»
nected diode `conductors wherein the magnetic circuit
for various adjacent diode conductors have air gapsv
'
CURRENT EALANCING REACTORS
therein.
Isadore K. Dortort, Philadelphia, Pa., assigner to I-T-E
` Circuit Breaker Company, Philadelphia, Pa., :l corpora#
` tion of Pennsylvania
,
~
s
r[bese and other objects of my invention will become
apparent from the following description when taken in
'
conjunction with the drawings in which:y ~
Filed Apr. 23, 1959, Ser. No. 808,501
12 Claims. (Cl. 307-«--58)
FIGURE 'l shows a rectiiier circuitl having >a
of parallel connected diodes.
My invention relates to balancing reactors for parallel
connected diodes, and is a continuation in part applica
tion of my copending application Serial No. 732,868,
filed May 5, i958, ynow Patent No. 2,945,961, entitled
plurality
FIGURE 2 shows the manner in which the diodes of
FIGURE l can be coupled by coupling reactors toy force
an equal current distribution between the diodes where
the coupling chain is open.
“Current Balancing Reactors for Diodes,” and assigned
» FIGURE 3 isssirnilar to FIGURE 2 where the chain
to the assignee of the present invention.
The above noted copending application Serial No. 15
732,868 describes a system for balancing the current be
of coupling reactors is closed.
tween a plurality of parallel connected diodes by cou
pling each pair of adjacent diodes with a common reactor
'
`
,
FlGURE 4 shows ano-ther manner in which the chain
of FIGURE 2 can be closed.
>
-
FIGURE 5 shows one of several laminations of a
iirst portion of a lamination Astack ywhich performs the
function of the individual reactors of FIGURE 3 where
parallel connected rectiiiers to be coupled, it was found 20 the lamination contains air gaps in accordance with my
that the use of individual coupling reactors leads to an
novel invention, and is interspersed among other lamina
core.
Since there may be as many as twenty or more
extremely complex and expensive system. Therefore,
tions of identical design except without air gap.
the above application shows how a plurality of individual
coupling reactors can be replaced by a single stack of
FIGURE 6 shows the lamination of a second portion
of `a lamination stack, interspersed with similar lamina
flat stamped magnetic laminations having apertures in 25 tions having no air gaps, the first and second'portions
registry with each of the diodeconductors to be coupled
forming the complete stack.f
where a ñrst portion of the laminations of the stack cou
FIGURE 7 illustrates a topview of the laminations
ple a given diode conductor with a first adjacent diode
of FIGURES 5 and 6 in superposition. »
and a second portion of the laminations couple the same
FIGUREv 8k is a schematic perspective view of the
diode with ay second adjacent diode.y kIn this manner, 30 manner in which «the lamination stack cooperates with
each pair of adjacent diodes of a parallel connected
the diode conductors, yas shown in FIGURE 7.
group will be coupled by ya magnetic path inthe same
FIGURE 9` shows the manner'in which the lamina
manner as if individual coupling reactors were used.
tion stack of FIGURE 8 caribe supported fronrthe
Furthermore, by appropriately designing the laminations,
an open or >`closed chain ofcoupling reactors can be
formed. Furthermore, the lamination may have two
parallel rows of apertures so that the length of the lamina
tion is reduced. lf required, the stack can be supported
rectirler bus structure, and is a cross-sectional view of
35
FIGURE 1G taken `across lines 9-~9.
`
Fl'GURE l0 shows a cross-sectional view of FIGUREy
f 9 taken across the ’lines 10.-10.
` FIGURE ll illustrates a lamination for a secondein-
`
bodiment of my novel invention yfor sixteen parallel
I have found that the characteristics of the reactor ofV 40 connected diodes.
‘
,
the above noted application can be improved and the
Referring now to FIGURE l, a single phase half-wave
current difference between adjacent diodes decreased by
rectifier is shown ktherein to merely illustrate how a
putting small air gaps in the laminations to prevent local
plurality yof rdiodes are connected in parallel to achieve
saturation of the lamination iron, and to reduce the resid
a particular current rating of a system. Thus, A.C.
ual magnetization. That is to say, the iron path ot' the 45 source 2l) is connected to a DC. load 22 through eight
from the main current carrying bus work.
lamination which joins `adjacent diodes is provided with
parallel connected diodes 24, 26, 20, 3d, 32, 34, 36 and
a cut or non-magnetic insert to increase the reluctance of
3S.
the path.
'
~
~
f'
`
‘
>As is fully described ink my copending` application,
. .lt is obvious that the effective length of air gap must
Serial No. 628,324, ñled December 14, 1956„ now .Pat
be kept very small, since- a large air gap would require 50 ent No.V 2,994,028, entitled “Current Balancing Reac
a large increase incrossësection and weight of core. One
tors for Rectifier Elements,” the forward current con
way to obtain small air gaps is by very careful stacking _ ducted by cachotl the diodes will ‘be different in ac
and grinding of the butt joint. This is an expensive op-~
cordance? with the forward conduction „characteristic
eration. A much easier and lessv expensive way `is to
of eachdiode. Therefore, as seen in FIGUREk 2, the
provide an ordinary air gap in only a percentage of the
conductors v40, 42, 44, 46, 48, 50, 52 and '54 asso
lalninations, uniformly distributed throughout a stack
ciatedV with diodes 24, 26, 28, A30, 32, 34, 36 and 38
of laminations without air gaps.
`
"
s respectively are interconnected by coupling reactors kwhich
For still smaller effective gap requirements, it has been
force equal current distribution between the diodes. More
found suilrcient in some cases to depend only on the in-`
specifically, each adjacent pair of diode conductors are
creased reluctance provided by the cross-grain ilow of 60 magnetically connected by coupling reactors 56, S8, 60,
flux in part of a magneticfloop in oriented steel.V
`
`
62, 64, 66 and 63. Where conductors 40 and 42 are linked
Where the apertures lie in two parallel lines,’the lines
' Ãby reactor 56, conductors 42 and 44 are linked by reactor
58, conductors 44 and 46 are linked‘by reactors 60~and
may be separated by a substantial air gap so that only
the consecutively adjacentfdiode conductors of the chain
so on. The conductors of each >pair are arranged to con
operate on one another land the diode conductors of one 65 ductrcurrent‘in opposite directions through their respec
tive reactor, as indicated-«by the convention of a dot, in
line do not affect the diode conductors of the other line.
Accordingly, the primary object of vmy invention >is
dicating current llow out of the plane of the drawing and
to provide a novel current balancing reactor for parallel ' '
a cross indicating current flow into the plane of the draw
connected` diodes,
ing.` Since the operation of the coupling reactors of the
s
,
Another object ol? my inventionis to provide a curf 70 drawings is_ the subject matter of above noted applica
tion Serial No. 628,324, reference is made theretofor op- _
rent balancing reactor formed of a laminated stack of
ironhavingjapertures therein for receiving parallel kcon
erational' details.
3,020,415
FIGURE 2 shows .the so»called open chain type of
coupling for forcing equalcurrent distribution between
the diodes 24-38 associated with conductors y40-5‘4 re
spectively. However, the chain maybe closed, as shown
in FIGURE 3, by a further coupling reactor 702 which
couples conductors 54 and 40.
If there are an odd number of parallel connected
diodes rather than the even number of FIGURES l, 2
and 3, the chain may be closed as in FIGURE 4 by
4
a certain percentage .of the laminations are provided with
air gaps, and these are uniformly distributed throughout
the stack so that each gap is tlanlred by an uncut lamina
tion. Thus the magnetizing current is not greatly in
creased, but the residual magnetization is considerably re
duced. By proper choice of proportion of cut and un
cut laminations it is, therefore, possible to reduce the net
unbalance between a given pair of coupled diodes.
It is to be noted that the cut stacks will be clamped
providing auxiliaryreactors 72 and 74 for conductors 40 10 by any desired type of clamping means, The clamping
and 52 respectively where each of auxiliary reactors 72
means has not been shown herein as it is not important
in the understanding of the present invention.
and 74 have air gaps 76 and 7S respectively and Wind
ings 80 and 32 respectively. The chain isclosed by con
The manner in which the laminations may be support
necting» the windings 80 and 82 together with the start
ed from the bus members is shown in FIGURES 9 and
10 for the case of the closed chain system of FIGURES
of one, indicated by the dot, connected to the ñnish of
the other. It is to be noted that an open chain of an
even number of diode conductorsv can be closed in the
manner of FIGURE 4'where the starts of windings 80
and 82 are >connected together. Clearly, many other
. 5, 6ar1d 7.
Referring now to FIGURES 9 and l0, the rectifier
assembly is supported from a frame member 132 of in
sulating material. The frame 13‘2 supports a ñrst and
types of `closing a loop of even .or odd numbers of diodes 20 second bus 134 and 136 which are bolted to frame 132
as by bolts 138 and 140 for bus 136 of FIGURE 9 and
are available, the methods shown hereinrbeing for pur
are positioned on nut plates 142, 144, 146 and 148. Buses
poses of illustration.
134.- and 136 contain cooling conduits 13‘5a-135b and
FIGURES 5 through 8'il1ustrate the manner in which
137a-137b respectively and support conductive diode
the coupling reactors can be formed by a stack of
laminations. For illustrative purposes, the closed chain 25 receiving blocks such yas blocks 150 through 156 for bus
136 and four similar blocks such as block 1581 for
of FIGURE 3 Ais illustrated.
bus 134.
The laminationstack of FIGURES is yshown as com
Each of the diode receiving blocks'as shown for block
prised of a tirstportion 9i? and a~second portion 92. The '
158 of FIGURE 9 -have tapped openings such-as opening
laminations of the ñrst portion 90 are illustrated vin FIG
URE 5 and comprise stamped laminations having open 30 160 for receiving theiry respective diode member, and
is bolted to its Vnut plates by bolts‘similar to bolts 162
ings 94, 96, 98 and ltltl'which receive-diode conductor
pairs 4th-42, 44-46, 48-543, and 52-54 respectively.
The laminations of the-second portion -92 are illustrated
in FIGURE 6 land comprise stamped laminations having
openings-102,104, 106 and 10S»which receive diode‘con
ductor pairs~42-,44, 46-478, 50-52 and 54-40 respec
tively.
and 164.
`
The output bus is comprised of first and second elon
gated angle shaped members 166 and 168 which are
positioned on andelectrically connected by conductive
bus 169 (FIGURE 9) and bolted to the frame 132 by
bolts 171 and 173.
The current balancing reactor laminations are sup
ported from the buses 166 and 16S by the diode con
That is, the 40 ductors as will be shown hereinafter and are com
The Alamination portions 90 and 92, when assembled -in
the manner of FIGURES 7 and- 8 will clearly provide
magnetic coupling, as shown in FIGURE 3.
conductors are surrounded by magnetic material in the
prised of a ñrst portion 176 corresponding to the lamina
tions of FIGURE 5, and a second portion 172 corre
sponding to the laminations of FIGURE 6. The lamina
tions `are preferably vinsulated from the buses in any de
also magnetically coupled to its other adjacent conductor 45 sired manner, and are clamped together in any desired
manner.
54 through~the lamination of FIGURE‘6.v In a similar
Since the pairs of adjacent conductors to be mag
manner, each pair-_offadjacent diode conductors are linked
netically coupled must pass through the laminations in
to one another `through armagnetic circuit.
opposite` directions, all of the diode conductors in which
In order to prevent local saturation of the lamination
iron, and to increase the accuracy in equalizing the cur 50 current is to pass from right to left, or diodes 26, 30, 34
and 38 (see FIGURE 8) are connected to bus 136, while
rent in adjacent’conductors, I have placed air gaps, or
the other diodes 24, 23, 312 and 36 are connected to bus
slots, in the laminations. Thus,-in the lamination of FIG
URE 5, a -ñrstf and preferably large `air gap >206 is cut , 134. Therefore, each of diodes 24, 28, 32 and 36, as
specifically shown for diode 36 in FIGURE l0, is conacross the full lamination. Ina »likemannen a cooperat
ing air gap 292 is cut in- the lamination of FIGURE 6. 55 nected through a respective current limiting fuse (fuse
176 -for diode 36) andrthen to diode conductor `52 which
The air gaps 290 and 202 will‘ prevent the undesired
is insulated-from bus 168 and the laminations 170 and
linking of oppositely positioned conductors lsuch as 42
same manner as if~individualreactors were used.
Thus,
conductor 42 is magnetically coupled to adjacent con
ductor 40through the lamination vof-FIGURE 5 and is
and 50.v A'smaller'air-gap'is placedy in the desired cou
pling paths to prevent saturation» and `reduced residual
172 by insulating sleeve 178 and insulating spacer 180,
and the diode conductor-then is electrically connected to
magnetization. Thus, in FIGURE 5, a-single cut» 206 60 bus 166. In a similar manner, the remaining diodes 26,
30, 34 and 36 of bus 136 are electrically connected to
is made through openings 94 and> 96 of -somefof the
bus
168, passing through andy being insulated from the
laminations, while a similar cut 208 is made through
bus 166 and cores 170 and 172 by insulating structure
openings 98 and 100 ofthe same laminations.v These
such as insulating sleeves 18.2, 184 and 186 respectively.
cuts will _insert partial air gaps -in the coupling circuits
In a similar manner, diode 26 being typical of diodes
of the lamination. Thus, conductors 40 and 42 will be 65
26, 30, 34 and 3-8 is electrically connected through fuse
linked by a magnetic path _including the _air gap caused by
188 to bus bar 168 after passing through the cores 170
cut 206 on either side of opening 94. In a like manner,
and 172. Note that conductor 42 of diode 26 is elec
each of conductor pairs ‘l0-_42, 48-56 and 52-54 'will
trically insulated from bus166 and laminations 17() and
have air gaps in their magnetic circuit.
Similar ycuts 210 and212 are placed in some of the
172 by insulating sleeve 190 and insulating spacer 192.
laminations of FIGURE 6. Thus, the magnetic circuit
From the foregoing, it is apparent that the lamination
coupling conductors 40 and 54 willl include a partial air
structure is supported from bus bars 166 and 168 by
gap formed `by portions of cut 210 and _212.
conductors 40, 42, 44, 46, 46, 50, 52 and 54 which
As previously described,- a cut -through _all the lamina
pass through thelamination structure> and are fastened
tions will produce too large an air gap. Therefore, only 75 to the buses. Accordingly, the structure is made ex
3,020,415
Ld
5
tremely compact, accessible for maintenance, and is eco
of said diode conductors terminating on a common bus
conductor means; the magnetic circuit for each of said
A further embodiment of my invention is shown in
diode conductors extending through a common aperture
FIGURE 1l. In the embodiment of FIGURE ll, 16
including a relatively small air gap; said relatively small
parallel diode conductors 22d-_26th respectively can be (TK air gap being formed by air gaps in a percentage ofy the
accommodated With current running in alternate directions
laminations forming said tirst and second portion of said
nomical.
`
'
as indicated. rl`he single lamination of FlGURE 1l
has apertures 262 through 276 which receive pairs of
stack of magnetic laminations. '
`
j
4. A current balancing reactor means for a plurality
conductors as shown. As was the case for the lamina
of parallel connected diodes; said current balancing re
tions of FIGURE 8, large air gap 27€; yseparates the two 10 actor means comprising a stack of magnetic laminations;
lines of apertures while end airgaps 28€) and 282y viso
each of said diodes having diode conductors extendingl ~
late the end apertures 263 and Z76from» the body of
therefrom; each of said diode conductors being posi
the lamination. kThe other section of the stack is similar
tioned ’adjacent a first and second diode conductorvof
in coníiguration to FÍGURE 5, but receives 16 diode con
saiddiode conductors; each of said diode conductors and
ductors.
v
'
The magnetic circuits of the conductors then have an
air gap inserted therein by cuts 234, 28S and 29d.
kAlthough I have described preferred embodiments of
my novel invention, many variations and modifications4
15 its said first adjacent conductor extending through a re
spectivc aperture in a ñrst portionof said stack of mag
netic laminations; each of said diode conductors and its
said second adjacent diode conductor extending through
arespe'ctive aperture in a second portion of said stack
will now be obvious to Athose skilled in the art, and l 20 oimagnetic laminations; each of said adjacent diode
prefer therefore to be limited not by the specific dis
conductors carrying current in an opposite direction; each
closure herein but only by the appended claims.L `
of said diode conductors terminating on a common bus
I claim:
`
l. A current balancing reactor means for a kplurality
conductor means; the magnetic circuit for each of said
diode kconductors extending through a common aperture
of parallel connected diodes; said current balancing re 25 including a'relatively small air gap; said relatively small
air gap being formed by air gaps in a percentagejof the
each of said diodes having diode conductors extending
laminations forming said first and second portion of said
therefrom; each of said diode conductors being positioned
stack Vof magnetic laminations; said air gaps including
adjacent a ñrst and second diode conductor Vof said diode
a slot connecting the said aperturesin said percentage of
conductors; each of said diode conductorsand its said 30 laminations.
Íirst adjacent conductor extending through a respective
-. 5. A current balancing reactor means for a plurality
aperture in a first portion of said stack of magnetic lami
of parallel connected diodes; said current balancing re
nations; each of said diode conductors and its said second
actor means comprising a stack 'of magnetic laminations;
adjacent diode conductor extending through a respective
each of said diodes having diode conductors extending
aperture in a second portion or” said stack ofgmagnetic 35 therefrom; each of said diode conductors being posi
laminations; each of said adjacent diode conductors carry
tioned adjacent a first and second diode conductor of
ing current in an opposite direction; each of said diode
said diode conductors; each of said diodeconductors and
conductors terminating on a common` bus conductor
itssaid first adjacent conductor extending through a re
means; said apertures of said ñrst and'second portions
spective aperture in a tirstportion of said stack of mag
of said stack of magnetic laminations being surrounded 40 netic laminations; each of said diode conductors and its
actor means comprising a stack of magnetic laminations;
by a magnetic circuit having a region of increased re
luctance to reduce saturation and theresidual magnetiza
tion of the magnetic material.
v
ì
l
~
2. yA current balancing reactor means for a plurality
said second adjacent diode conductor extending through
a respective aperture in a second portion of said stack
of magnetic laminations; each of said adjacent diode con
ductors carrying current in an opposite direction; each
of parallel connected diodes; said current balancing re 45 of said diode conductors terminating on a common bus
actor means comprising a stack of magnetic laminations;
conductor means; said bus conductor means being com
each of said` diodes having diode conductors extending
prised of a` first and second portion positioned adjacent
therefrom; each of said diode conductors being positioned
la firstand second face of said stack of magnetic lami
adjacent a first and second diode conductor of said diode
conductors; cachot saiddiode conductors and its said
„iirst adjacent conductor extending through a respective
aperture in a first portion of said stack of magnetic lami
nations; each of said diode conductors and its said second
adjacent diode conductor extending through a respective
aperture in a, secondy portion of saidr stack of magnetic
laminatiOnS; each of said adjacent diode-conductors carry
ing current in an opposite direction; each of' said diode
Yconductors terminating on a common bus conductor
means; the magnetic circuit for each of said diode con
nations; alternately positioned diode conductors passing
50 current through said stack in a ñrst direction terminating
at said ñrst bus portion; the other of said diode con
ductorspassing'current through said stack in a direction
opposite vsaid first direction terminating at said second
bus portion; theïma-gnetic circuit foreach of said diode
conductors extending through a common aperture includ
ing a relatively small air gap.
;
6. A current balancing reactor means for a plurality
of parallel connected diodes; said currentbalancing reac
ductors extending through a common aperture including 60 tor means comprising a stack of magnetic laminations;
each of said >diodes having diode conductors extending
a relatively small air gap.
f
»,
'
l
therefrom; each of said diode conductors being positioned
3. A current balancing reactor means for a plurality
¿adjacent a’iirst `and secondy diode conductor of said diode
of parallel connected diodes; said current balancing re
-conductors;
each of said diode conductor and its said first
actor means comprising a stack of magnetic laminations;
adjacent conductor extending through a respective aper
each of said diodes having diode conductors extending
-ture in a first portion of said stack of magnetic lamina
therefrom; cachot said diode conductors being posi
tions; each of said diode conductors and its said second
tioned yadjacente first and second diode conductorfof
adjacent diode conductor `extending through a respective
said diode conductors; each of said diode conductors and
aperture in a second portion of said stack of magnetic
its said first adjacent conductor extending through a re
laminations; each of said adjacent diode conductors carry- `
spective aperture in a tirst portion of said stack of mag 70 ing current in an opposite direction; each of said diode
netic laminations; each of said diode conductors and its
conductors' terminating on a common bus conductor
said second adjacent diode conductor extending through
means; said bus conductor means being comprised of a
a respective aperture in a second portion of said stack
ñrst and second portion positioned adjacent a first and
of magnetic laminations; each of said adjacent diode con
second face of said stack of magnetic laminations; alter
ductors carrying current in an opposite direction; each 75 nately positioned diode conductors passing current
3,020,415
through said stack in a first direction terminating at said
first bus portion; the other of said diode conductors pass
ing current through said stack in a direction opposite
said first direction terminating at said second bus por
tion; the magnetic circuit for each of said diode con
ductors extending through a common aperture including
a relatively small air gap; said relatively small air gap
being formed by air gaps in a percentage of the lamina
tions forming said first and second portion of said stack
of magnetic laminations; said air gaps including a slot
connecting the said apertures in said percentage of lamina
tions.
7. A current balancing reactor means for a plurality
of parallel connected diodes; said'curreut balancing reac
means comprising a stack or" magnetic laminations; each`
of said diodes having diode conductors extending there
from; each of said diode conductors being positioned ad
jacent a first and second diode conductor of said diode
conductors; said stack of magnetic laminations being com
prised of a first and second portion; each of said first and
second portions of said stack of magnetic laminations
including a first and second row of apertures; each of said
diode conductors and its said first adjacent diode con
ductor extending through a respective aperture of said first
portion of said stack of laminations; each of said diode
conductors and its said second adjacent diode conductor
extending through a respective aperture of said second
portion of said stack of magnetic laminations; each of
tor means comprising a stack of magnetic laminations; 15 said adjacent diode conductors carrying current in an op
posite direction; each of said diode conductors being mag
each of said diodes having diode conductors extending
therefrom; each of said diode conductors being posi
tioned adjacent a first and second diode conductor of said
diode conductors; said stack of magnetic laminations be
ing comprised of a first and second portion; each of said
netically coupled through said stack of magnetic lami
nations; said laminations being grain oriented in the direc
tion of said rows of apertures.
l0. A current balancing reactor means for a plurality
of parallel connected diodes; said current balancing re
first’and second portions of said stack of magnetic lami
actor means comprising a stack of magnetic laminations;
nations including a first and second row of apertures;
each of said diodes having diode conductors extending
each of said diode conductors and its said first adjacent
therefrom; each of said diode conductors being positioned
diode conductor extending through a respective aperture
of said first portion of said stack of laminations; each of 25 adjacent a first and second diode conductor of said diode
conductors; said stack of magnetic laminations being
said-diode conductors and its said second adjacent diode
comprised of a first and second portion; each of said first
conductor~` extending through a respective aperture of
and second portions of said stack of magnetic lamina
said second’portion of said stack> of magnetic laminations;
tions including a first and second row of apertures; each
in an opposite direction; each of said diode conductors 30 of said diode conductors and its said first adjacent diode
conductor extending through a respective aperture of said
being magnetically coupled through said stack of mag
first portion of said stack of laminations; each of said
netic laminations; the magnetic circuit for each of said
diode conductors and its said second adjacent diode con
diode conductors extending through a common aperture
ductor extending through a respective aperture of said
including a relatively small air gap; said relatively small
each of said adjacent diode conductors carrying current
air gap being formed by air gaps in a percentage of the 35 second portion of said stack of magnetic laminations; each
of said adjacent diode conductors carrying current in an
laminations forming saidfirst and second portion of said
opposite direction; each of said diode conductors being
stack of magnetic laminations.
magnetically coupled through said stack of magnetic
8. A current balancing reactor means for a plurality
laminations; said laminations being grain oriented in the
of'parallel connected diodes; said current balancing re
actormeans comprising a stack of magnetic laminations; 40 direction of said rows of apertures; the magnetic circuit
for each of said diode conductors extending through a
each of said diodes having diode conductors extending
common aperture including a relatively small air gap; said
therefrom; each of said diode conductors being positioned
adjacent a first and second diode conductor of said diode
conductors; said stack of magnetic laminations being
comprised'of a first and second portion; each of-said first
and second portions of said stack of magnetic laminations
including a first and second row of apertures; each of Said
diode conductors and its said first adjacent diode con
relatively small air gap being formed by air gaps in a
percentage of the laminations forming said first and sec~
ond portion of said stack of magnetic laminations.
l1. A first and second lamination for -a current balanc
ing reactor for balancing the current between parallel
connected conductors; each of said first and second l-ami
nation containing a first and second aperture therein; each
said
said 50 of said first apertures receiving a first conductor of said
parallel connected conductors; each of said second aper
con
tures receiving a second conductor of said parallel con
said
nected conductors; said first aperture of said second lami
second portion of said stack of magnetic laminations; each
nation and said second aperture of said first lamination
of said adjacent diode conductors carrying current in an
opposite direction; each of said diode conductors being 55 receiving a third conductor of said parallel connected
conductors; said first and second apertures of each of said
magnetically coupled through said stack of magnetic lami
first and second laminations being spaced from one an
nations; the magnetic cir-cuit for each of said diode con
other; said first and second apertures of said first lami
ductors extending through a common aperture including
nation being joined by an air gap.
a relatively small air gap; said relatively small air gap
12. The device as set forth in claim 11 wherein said
being formed by air gaps in a percentage of the lami 60
second. lamination is continuous.
nations forming said first and second portion of said stack
of magnetic laminations; said air gaps including a slot
References Cited in the file of this patent
connecting the said apertures in said percentage of lami
UNITED STATES PATENTS
nations.
ductor extending through a respective aperture of
first portion of said stack of laminations; each of
diode conductors andits said second adjacent diode
ductor extending through a respective aperture of
9. A current balancing reactor means for a plurality of 65
parallel connected diodes; said current balancing reactor
400,515
2,011,335
Thomson _____________ __ Apr. 2, 1889
Friedman ____________ __ Aug. 13, 1935
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