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Патент USA US3058049

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Oct. 9, 1962
w. A. RAY
3,058,039
LAMINATED MAGNETIC vSTRUCTURE, AND PROCESS FOR MAKING SAME
Filed June 24. 1957
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INVENTOR.
BY JQMM 1%»
United States Patent Office
1
3,058,939
LAMINATED MAGNETEC STRUCTURE, AND
PROCESS FDR MAKING SAME
William A. Ray, North Hollywood, Caiih, assignor to
3,958,039
Patented Get. 9, 1962
2
FIG. 4 is a side view of the stacks illustrated in FIG.
3; and
FIG. 5 is a fragmentary pictorial view illustrating one
of the welded ridges of the stack of laminations.
General Controls (10., a corporation of California
The laminations 1 are shown in this instance as
E-shaped, having outer arms 2 and 3, a central arm 4
and a base member 5. The space between each of the
outer arms 2 and 3 and the center arm 4 is arranged
This invention relates to magnetic laminated structures.
Magnetic cores for electromagnets and relays, and 10 to accommodate a winding.
The stack of laminations 6 constitutes an armature
adapted to be operated by alternating current, are almost
Filed June 24-, 1957, Ser. No. 667,463
1 Claim. (Cl. ‘*17-198)
universally made up of laminations. In many of these
devices, there is a movable armature attracted by the core
for the electromagnet coil. It is essential that the con
tacting surfaces of the core and armature be as perfectly
plane as possible, so as to cause the contact between these
structure adapted to be attracted by the stack 1.
In the present instance, the outer edges 16 of the arms
3 and 4 are adapted to lie on a plane 9, and to contact
with the lower edge 17 of the stack 6. The upper edge
13 of central arm 4 is disposed slightly below these outer
edges so as to provide ‘a relatively small gap between arm
elements to be as close as possible, and thereby improve
4 and stack 6. Furthermore, each of the arms 2 and 3
the operation of the relay or magnet.
is provided with a slot 7 and 8 for accommodating a
Since usually the laminations are held together by fas
tening means, such as rivets passing through clearance 20 shading coil. The inside projections 19 of arms 2 and 3
are also shown cut back slightly below the plane 9.
holes in the laminations, it is not to be expected that the
The plane 9 is intended to be parallel to and cooperate
resultant surfaces formed by the edges of the laminations
with plane 10 corresponding to the cooperating face of
would all lie in the same plane. This is obvious because
the stack of laminations 6.
of the looseness of the ?t of the rivets in the clearance
holes. Accordingly, it is common to grind o? these edges 25 Each of the laminations comprising stack :1 is also pro
vided with one or more cars ill at a place remote from
to form a geometrically true plane surface.
the edges of the arms 2 and 3. The laminations 6 are
It is one of the objects of this invention to obviate these
also each provided with corresponding ears 12 on that
expensive operations, and yet to make it possible to pro
side of the laminations remote from plane 10.
duce substantially true plane surfaces intended to be
In preparing the stack of laminations, the upper edges
placed in contact with other elements of the magnetic
16 are placed against a geometrically perfect plane 9;
circuit.
and one of arms 2 or 3 of each lamination is placed along
In some instances, the core for the magnet coil is
a corresponding plane v13 perpendicular to plane 9. They
formed as an E, the ends of the arms being adapted to
are temporarily held in this position in any appropriate
attract an armature extending across the faces of these
arms. Often the center arm is purposely made shorter 35 manner. Then the ears Ill are welded together. This
welding can be effected by the heliarc or inert gas weld
than the outer ones, whereby a small air gap is formed
ing without the necessity of adding material. At the
between it and the armature. The amount of cutback is
fairly critical, and variations from the desired air gap
value result in unsatisfactory magnetic operation, usual
ly with a tendency to hum.
it is accordingly another object of this invention to
provide substantially accurately de?ned air gaps in cores
of this character.
completion of the welding operation, a continuous ridge
14 (FIGS. 3, 4 and 5) of welded metal is formed trans~
verse of the stack of laminations.
This Welding is ac
complished, of course, while the stack is held against the
surfaces 9 and 13.
At the completion of the welding operation, the stack
may be permanently joined as by the aid of fastening
In order to accomplish these results, the present in
15, such as rivets, passing through appropriate
vention contemplates a Welding operation to hold the 45 means
apertures 26 in the laminations.
laminations in accurate alignment before the rivets are
By placing the ears Jill and 12 at the outer edges of the
applied. Thus haphazard variations in the stacking of
laminations,
the welded parts are kept substantially en
the laminations prior to riveting are prevented.
tirely out of the ?ux path.
This invention possesses many other advantages, and
The armature laminations 6 are also joined together as
has other objects which may be made more clearly ap
by welding the cars 12 to form the ridges 21 (FIGS. 3
parent from a consideration of one embodiment of the
and 4). This is accomplished while the laminations 6
invention. For this purpose, there is shown a form in
are held against the geometrically ?at surfaces 10 and 18
the drawings accompanying and forming a part of the
which are mutually perpendicular.
present speci?cation. This form will now be described
the planes 9 and it) serve to align the edges of
in detail, illustrating the general principles of the inven 55 theThus,
laminations 1 and 6 to conform to a geometrically
tion; but it is to be understood that this detailed descrip
?at surface; and these laminations are permanently joined
tion is not to be taken in a limiting sense, since the scope
while in that position.
of this invention is best de?ned by the appended claim.
The critical requirement of substantially accurate ?at
Referring to the drawings:
ness
of the cooperating edges of the stacks of laminations
FIGURE 1 is an elevation showing two stacks of lami 60
is readily obtained by this process. Accordingly, annoy
nations which are designed to incorporate the core
ing humming or inefficiency in operations may be avoided
invention;
without the necessity of grinding the cooperating contact
'FIG. 2 is a side view thereof;
ing surfaces.
FIG. 3 is a view similar to FIG. 1, but illustrating the
The inventor claims:
stacks joined together by a welding operation;
In an electromagnetic relay structure: a ?rst stack of
3,058,039
3
identical laminations forming an electromagnet core, and
each having end edges falling in a ?rst common plane to
4
preventing separating movement of the second stack of
laminations.
de?ne a polar area; means forming a unitary weld ex
tending transversely of the ?rst stack of laminations at
a place remote from said polar area to con?ne the lami
nations against relative sliding movement, thereby caus
ing said end edges to remain in said ?rst common plane;
clamping means extending transversely through the ?rst
stack of laminations, preventing separating movement of
the ?rst stack of laminations; a second stack of identi 10
cal laminations forming an .electromagnet armature, and
each having edges falling in a second common plane to
de?ne an area for cooperation with said polar area; means
forming a unitary Weld extending transversely of the sec
ond stack of laminations at a place remote from its said 15
area to con?ne the laminations against relative sliding
movement, thereby causing the end edges to remain in
said second common plane; and clamping means extend
ing transversely through the second stack of laminations,
References Cited in the ?le of this patent
UNITED STATES PATENTS
577,480
1,696,615
2,207,572
2,330,824
Gutmann ____________ __ Feb. 23,
Trombetta ___________ __ Dec. 25,
Ayers ________________ __ July 9,
Gr-an?eld ______________ __ Oct. 5,
1897
1928
1940
1943
2,447,911
Mages et a1. _________ __ Aug. 24, 1948
2,488,961
2,538,036
Camilli ______________ __ Nov. 22, 1949
Ponstingl ____________ __ Jan. 16, 1951
2,762,988
Pornazal et a1 _________ __ Sept. 11, 1956
OTHER REFERENCES
Holland: Abstract of Application Serial No. 755,368,
published January 17, 1950, 630 0.6. 859.
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