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Патент USA US2411563

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NOV- 25, 1946-
Filed Nov. 6, 1945
-' 75/62.
Patented Nov. 26, 1946
Stanley Herbert Towner and Percy Arthur Childs,
London,‘ England, assignors, by mesne assign
ments, to International Standard Electric il‘or
radiation, New York,
N. ‘X., a ' corporation of
Application November 6, 1943, Serial No. 509,216
In Great Britain December 23, 1942
8 Claims. (Cl. 175-338)
The present invention relates to electromag
netic relays and is particularly concerned with
the improvement of the magnetic circuit‘of vi
brating relays.
The relays with which the invention is con
cerned are of the kind in which the armature is
carried by an elastic reed adapted to execute
free vibrations at some de?nite frequency, or to
be driven by alternating current which is ap
plied to an operating winding and which may
have the same frequency as that natural to the
reed. The reed hay control contacts which are
periodically operated thereby.
The invention is directed to the improvement
of the magnetic circuit of the relay whereby the
operating winding is enabled to exercise a better
control over the reed.
According to the invention, there is provided a
magnetic circuit for an electromagnetic relay
having an armature carried by a vibratable reed,
comprising a core adapted to carry an operating
winding or win-clings, a yoke magnetically con“
nected to the core, and two pole-pieces, one being
bifurcated, with two substantially parallel limbs,
the other pole-piece and the armature being ar~=
ranged between the said parallel limbs, the core,
yolse and pole-pieces being composed of magnetic
Two elm bodiments oi the invention will be de
‘i reference to Figs. 1 and 2 of the ac—\
company 1g drawing.
Fig. 1 shows a preferred embodiment. rl‘he
magnetic circuit of the relay comprises a core l
on which any suitable operating winding (not
shown) in the be
of a U with
twoa down-turned
normal path of the magnetic
pole-pieces and the reluctance o
decreased as the armature approaches the pole
piece All. If a suitable winding “ mounted on the
core l and is energised with rest current, the
armature will be attracted towards the pole
piece E: and will ultimately rest thereon. When
the energising current is cut oil, the reed will
be released and will execute free vibration at its
natural period. The reed may be adapted to
control any desired assembly of contacts (not
The eii?ciency of electromagnets having a rela
tively large armature movement is :nproved by
the use of a bifurcated pole-piece such as 2, and
the improvement is greatest when the air-gap
between "i and fl is large, that is, just before the
armature begins to move when the operating
winding is energised. The pole~piece
,1 preferably be arranged so that it will hold the
armature and reed in the fully deflected position
when the winding is continuously energised.
This pole-piece assists in the initial attraction
of the armature, but has the maximum effect
when the air gap is small.’
The arrangement of Fig. 1 permits
ture to be moved along the
oi the reed wlth~
out appreciably affecting the e?iciency of the
magnetic circuit. This feature is valuable, since
30 it allows the vibrating system to be tuned with“
out impairing the operation of the relay.
Fig. 2 shows a fragmentary sketch of a slightly
different arrangement of the armature and pole
pieces according to the invention, which is
exactly the same in principle. The'back ends
of the core and yoke 5 may be as shown in Fig.
limbs 3A and 3B between which is placed the
other pole-*plece 5, which is constituted by the
1, and are not shown in Fig. 2.
away from the pole~pieoe ll. All the details l, 2,
Figs. 2
l is that the bifurcated pole-piece
is carried by the yoke instead of by the core.
As in the case of Fig. l, the air-=gaps between
the pole=piece ill and the blocks all and. 1328
should preferably be large cor Jared with the
The core l is provided with a plain pole-piece
it which corresponds in function with the pole
end of makes
a portion
of reduced
with the
of the
end yoke
or" the
ac piece ii of Fig. 1. A bifurcated pole-piece is pro
core 3.
vided for the yoke 5 by means or" the blocks lSA
The ‘vibrating reed
is assembled below the
and H33 of magnetic material fixed thereto and
yolre 5 by means not shown and carries the arma
embracing the" pole~piece l1.
the armature
ture l’ which is also placed between the limbs 3A
7 carried by the rec ‘
arranged below.‘ It will
and 3B of one pole»picce 2 and is normally spaced
be evident that the principal di?ererice- between
and ‘i’ should be made of soft iron or other suit
able magnetic material.
The air spacing between the pole-piece £1 and
the limbs
of the pole-piece should
preferably be large compared with the spacing
armature air~gaps.
between the armature l’ and these limbs, as in»
In always
either have
case, the
the same
polarity, so
dicated in Fig. l, in order that the magnetic flux
may not be unduly shunted away from the arma
that they constitute a single divided pole piece
ture. This armature will then lie mainly in the 55 and not separate pole~pieces
operating winding, a yoke magnetically coupled
to the opposite ends of said core construction and
It will be evident that the blocks lbs and I33
could, if' desired, be formed integrally with the
yoke 5. and in Fig. l, the limbs 3A and 33 could
be separate pieces.
What is claimed is:
forming a magnetic path for the 1 iagnetic ~?ux of
variable ?ux is produced,means forming a mag
said core construction, said yoke having two pole
piece structures one of which is bifurcated with
two parallel limbs having opposing faces and the
other of which is positioned adjacent said limbs,
netic circuit comprising, a substantially rigid core
assembly having a‘ double gap at which the flux
and a vibratable armature formed by a movable
pole piece carried by a vibrator reed with the mov
divides into two substantially parallel paths, said
able pole piece positioned at'the edge of the zone
between said limbs and mounted to vibrate par
allel to the opposing faces of said limbs to and
from said other pole-piece structure.
4. A device as described in claim 3 wherein, said
15 birfucated pole-piece structure is formed by a
1. In an electromagnetic device in which a
double gap being formed by a ?xed central pole
piece positioned between two rigidly connected
spaced pole pieces with the gaps being formed on
the opposite'sides of the‘ central pole piece, and
a vibrating armature formed by an iron piece
positioned with one face substantially parallel to
single member attached to one end of said core
one face of said central pole piece and with two
construction, and wherein said other pole-piece
opposite edge faces parallel to and spaced from
structure is an integral portion of an L-shaped
the respective faces of said spaced pole pieces,
yoke portion attached to the other end of said core
said iron piece being mounted to vibrate in the 20 construction.
planes of said edge faces transversely of the adja
5. A device as described in claim 3 wherein,
cent face of said central pole piece and parallel
said movable pole piece is adjustably attached to
to the adjacent faces of said spaced pole pieces.
said vibrator reed whereby the natural frequency
2. In an electromagnetic device, means forming
of vibration of said vibratable armature may be
a magnetic circuit having an air gap therein com 25
prising, a rigid core assembly having a double gap
6. A device as described in claim 3 wherein, Y
at which the flux divides into two parallel paths,
said vibratable armature has an elongated vibrat
said double gap being formed by a central core
able reed attached at one end to said yoke and
portion positioned between a pair of parallel side
carries said movable pole pieceadjacent its other
core portions with each of the side core portions 30 end, and wherein the natural frequency of vibra
having a pole face parallel to and adjacent a pole
tion of said vibratable armature may be changed.
face of the central core portion whereby the two
7. A device as described in claim 3 wherein,
parallel paths are'respectively from the above
said bifurcated pole-piece structure is formed by
mentioned pole faces of the central core portion
a pair of separate pole‘ pieces attached to a yoke
to the respective pole faces of the side core por 35 frame member and wherein said other pole-piece
tions, and a vibratable armature positioned ad
structure is formed by a single member attached
jacent said central core portion and adapted to
to one end of said core construction.
vibrate toward and away from said central core
8. A device as described in claim 3, wherein
portion, said vibratable armature having edge por
said vibrator reed is elongated and is attached
tions which are positioned adjacent said side core 40 to said core at one end and carries said movable
portions during the time that the armature is
pole piece adjacent its other end with the vibrator
nearest said central core portion whereby a part
reed extending substantially parallel to one face
of the magnetic ?ux in each of said parallel paths
of said other pole-piece structure and substan
is diverted through said edge portions of ‘said
tially parallel to said limbs, and wherein said
3. In an electromagnetic relay,,the combina
tion of, a core construction adapted to carry an
45 core construction and yoke are formed of iron.
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