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Патент USA US3041575

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June 26, 1962
w. J. BRADBURN, JR..Y ETAL
. 3,041,565
LAMINATED WINDING CORE FOR ELECTROMAGNETIC DEVICES
-
Original Filed Feb. 25, 1954
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United States Patent 0 ” ICC
3,041,565
Patented June 26, 1962
1
2
3,041,565
when the orientation of the grain is in the direction of the
arrows 18 since then the lines of flux within the core will
LAMINATED WINDING CORE FOR ELECTRO
MAGNETIC DEVICES
William J. Bradburn, Jr.,Waukesha, Hans Richard Ansgar
normally be substantially parallel to the longitudinal. axes
of the two legs 10 and 12 of the core, and therefore paral
lel to the direction of grain orientation, but will be sub
stantially perpendicular to the direction of grain orienta
a corporation of Wisconsin
tion in the bases 14 and 16. Thus although the perme
Original application Feb. 23, 1954, Ser. No. 411,613.
ability of the core would be considerably reduced in the
Divided and this application June 6, 1958, Ser. No.
bases
thereof because of this grain orientation, this varia
740,397
tion
will
be at least partially overcome by the greater
10
2 Claims. (Cl. 336-217)
width of the bases, and the rather close spacing of the
This invention relates to laminated winding cores for
two legs 10 and 12. This con?guration of the lamina
electromagnetic devices such as magnetic ampli?ers and
tions necessarily produces a window in the core which is
Hansen, Milwaukee, and Elmer G. Conger, Cudahy,
Wis., assignors to The Louis Allis (10., Milwaukee, Wis.,
more particularly to laminated cores of grain oriented
relatively long and narrow, however.
metal. This application is a division of the applicants’ co 15
The fact that there is a gap between the outer extremities
pending, but now abandoned, application, Serial No.
of the arms of the U-shaped laminations in the form of
411,613, ?led February 23, 1954 and titled “Laminated
core shown in FIGURE 1 of course has some effect on
Winding Core for Electromagnetic Devices.”
'
the permeability of the bases 14 and 16, and therefore
As is well known, grain orientation in metal has a very
also affects the dimensions which are required for these
substantial effect on the magnetic properties of that metal. 20 bases. As shown in FIGURE 1, utilizing a core having
Silicon steel sheets, for example, possess better magnetic
characteristics when used with magnetic ?ux which is,
nearly as possible, parallel to the rolling direction. In
the past in forming laminated gapless cores from grain
U-shaped laminations of a width substantially equal to 3a,
with a being the width of an arm of the U-shaped lamina
tions, the width b of each the bases 14 and 16, respec
tively, which has been found to be suitable if either greater
oriented material this difference has been partially over 25 than or equal to 2a. A core having these dimensional
come by making the bases of the cores relatively short and
characteristics has been found to be satisfactory from
wide as distinguished from the relatively narrow and elon
an electromagnetic standpoint.
‘
gated legs of the cores, the orientation of the grain being
It has been found that an improved form of core can be
substantially coincident with the longitudinal axes of the
formed which is similar to that shown in FIGURE 1, but
latter. This form of construction has required the use
in which the amount of lapping of adjacent laminations
of a greater amount of metal and has also ‘made it pos
is considerably reduced. In order to avoid high ?ux con
sible to provide only relatively long, narrow “windows” or
centration and saturation of the iron, it is necessary to have
openings in the center of the core. This in turn has ser
some surface overlap of the ends of the arms of one U
iously limited the size and number of windings which it
shaped piece with the base of the next adjacent piece, but
is possible to place on such cores.
35 it is not necessary to have a complete ,overlap as shown
'It is therefore an object of this invention to provide
in FIGURE 1.
laminated cores of a gapless construction utilizing grain
Referring speci?cally to FIGURES 2 and 3, substantial
oriented metal which require a smaller amount of metal to
ly L-shaped laminations 50 and 52 may be utilized for pur
assemble and which still achieve electromagnetic charac
poses of improved core construction which laminates are
teristics which are the equivalent of the conventional forms 40 cut preferably from a suitable strip 54 of grain oriented
of cores.
metal. Likewise, end pieces 56 may be also cut from the
same strip 54 and these elements assembled as shown in
FIGURE 3. The L-shaped laminations 50 and 52 may be
disposed in two stacks with the bases 58 and 60 thereof at
Another object is to provide a window of increased width
in such cores, Without sacri?cing desirable electrical char
acteristics.
Still another object is to provide cores of the character
alternate ends and ‘being partially overlapped by the outer
described which utilize laminations of relatively simple 45 extremities of the arms of the next adjacent L-shaped
con?guration which may be readily assembled.
laminations. These two stacks, indicated generally by
Further objects and advantages of this invention will
the numerals 62 and 64, may be joined by the end pieces
become evident as the description proceeds and from an
56 which may be disposed in association with the bases
58 and 60 between the arms of the corresponding lamina
examination of the accompanying drawings which illus
trate several embodiments of the invention and in which 50 tions in each stack.
similar numerals refer to similar parts throughout the
This construction, as shown in FIGURE 3, enables the
several views.
window in the core to be widened. This is a distinct ad
vantage since ordinarily a severe limitation exists in the
In the drawings,
FIGURE 1 is a plan view of one form of core utilizing
U-shaped laminations of grain oriented metal.
55
FIGURE 2 is a plan view of a strip of grain oriented
material showing how substantially L-shaped laminations
can be cut therefrom, together with suitable end pieces for
use with such laminations.
FIGURE 3 is a plan view of a modi?ed formv of core 60
utilizing the L-shaped laminations shown in FIGURE 2,
together with the end pieces disclosed therein.
FIGURE 4 is a plan view of still another form of core
size and number of windings or coils that can be placed
on the legs of the core because of the narrowness of the
window. At the same time the proper permeability is
achieved in the bases of the core, indicated generally by
the numerals 66 and 68, through the use of end pieces
having a grain orientation as indicated by the arrow 70.
Still another form of core which can be fabricated from
these L-shaped laminations is shown in FIGURE 4. This
form differs fromthat shown in FIGURE 3 in that the
end pieces 56 are eliminated and the corresponding lamina
tions in each stack have their bases 58 and 60 disposed at
utilizing the L-shaped laminations disclosed in FIGURE 65
opposite ends thereof. This enables the bases in one
2, without the end pieces.
stack, at both ends thereof, to partially overlap the bases
As mentioned above, it is customary when utilizing grain
in the corresponding ends of the other stack.
oriented material to give the core a con?guration such
In the form of core shown in FIGURE 3 the width of
that rather narrow, elongated legs are provided such as the
the end pieces 56 is preferably equal to b which is pref
legs 10 and 12 shown in FIGURE 1. These legs, in turn, 70 erably equal to or greater than 2a. In the form of core
have the bases 14 and 16 extending therebetween which
are relatively short and wide. This shape is desirable
shown in FIGURE 4, however, [2 is also preferably greater
than or equal to 2a, whereas 0, the distance between each
‘8,041,565
3
4
laterally adjacent base and arm extremity, is preferably
alternate laminations being disposed so that their bases
are at opposite ends of said core, said laminations being
between one-third and two-thirds a. The amount of over
lap d, which is preferable for the extremities of the legs or
arms of the L-shaped pieces over the bases of immediately
adjacent laminations is greater than one-third a but less
than or equal to b.
All of the cores described are believed to be improve
ments over the conventional forms of laminated cores.
so disposed in two vertical stacks with each set of lateral
ly corresponding laminations of both stacks having their
bases disposed opposite one another, and a plurality of
end pieces disposed in two stacks, each end piece in each
of said stacks being disposed in partially overlapping rela
tion With the bases of one of said, sets of laterally corre
sponding laminations and being disposed between the outer
The bene?ts from the use of grain oriented material for
the laminations have been attained, but at the same time 10 extremities of the arm members of another of said sets of
some of the limitations previously inherent in the use of
such materials have been overcome.
Iron-silicon alloys, nickel-iron-silicon alloys and silicon
laterally corresponding laminations.
2. A laminated winding core for electromagnetic de
vices comprising a plurality of substantially L-shaped
laminations of grain oriented metal laminations each said
steel alloys have been found to be suitable as core mate
rials in all of the various forms described.
15 lamination having a base member and an elongated arm
\In the drawing and speci?cation, there have been set
member of lesser Width than said base member, said arm
forth preferred embodiments of the invention, and al
member only partially overlapping the base of each verti
though speci?c terms are employed, they are used in a
cally adjacent lamination by an amount substantially less
generic and descriptive sense only and not for purposes
than the width of said base member in the direction of
of limitation. Changes in ‘form and in the proportion of 20 the width of the base member, with alternate laminations
parts, as well as the substitution of equivalents are con
being disposed so that their bases are at opposite ends of
templated, as circumstances may suggest or render expedi
said core, a plurality of end pieces, said laminations being
ent, without departing from the spirit or scope of this in
so disposed in two vertical stacks with said end pieces in a
vention as further de?ned in the following claims.
magnetically coupled relation so as to form a closed ?ux
We claim:
25 path through said stacks.
1. A laminated winding core for electromagnetic de
References Cited in the ?le of this patent
vices comprising a plurality of grain oriented metal lamina
tions each said lamination having a base member and an
UNITED STATES PATENTS
elongated arm member of lesser width than said base
2,316,928
Woodward ___________ __ Apr. 20, 1943
member, said arm member partially overlapping the base
FOREIGN PATENTS
of each vertically adjacent lamination by an amount sub 30
stantially less than the height of said base member, with
291,922
Switzerland ___________ .__ Oct. 1, 1953
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