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Патент USA US2404332

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July 16, 1946.
' 2,494,332 .
Filed Feb. 16, 1944
2 Sheets-Sheet l
In?) eniozb
5 . .E’, Kern er
July 16,1946-
s. E. WERNER '
Filed Feb’. 16, '1944
2 Sheets-Sheet 2
, 5.17,]1Zérner
Patented July 16, '1946
Sture Edvard Werner, Stockholm, Sweden, assign
or to Telefonaktiebolaget L. M. Ericsson, Stock
holm, Sweden, a company of Sweden
Application February 16, 1944, Serial No. 522,668
In Sweden January 13, 1943
7 Claims. (Cl. 172—36)
The invention relates to an electro-motor for
operating teletechnical apparatus, especially
62, 63 for each rotor and is provided with a, nose
indicating the direction. Both rotor shafts 5!,
such automatic telephone selectors, whose con
52 respectively are encircled each by its winding
tact arms have two directions of movement.
X5 or Y5 respectively, ?xed on a tube fastened
Hitherto, a motor combined with a special
on the yoke 53. These windings do thus not con
switching device has been employed for the op
tribute to the rotating movement of the shafts.
eration of such selectors. In order to avoid this
The core 6| is also provided with a winding S5.
kind of switching device, the structure of which
The operation of the motor will now be closer
is relatively complicated, the use of two separate
motors has been proposed. However, two motors 10 described, the movement of one of the rotors 56
being described ?rst. The three-parted arma
require a double equipment of stators and com
ture 56 is maintained in the initial position of
mutators and the object of the present invention
the constant magnetic ?ux as shown in the draw
is to produce a built-together motor with two ro
ings, the flux being produced by a permanent
tors so that said parts, entirely or partly, may be
rendered common to both directions of move 15 magnet 58. This ?ux passes from the magnet
over pole piece 59 through armature 56 and ar
ment. According to the invention this is
mature shaft 5| and through a part of the yoke
achieved chie?y by the motor being provided
53 back to the magnet. Assume that an impulse
with a stator with a constant magnetic ?ux pro
is sent through the winding X5 from the conduc
duced by a magnet, and with two rotors being
tor ‘H, a flux is produced through shaft 5! which,
disposed at di?erent points of the magnetic ?ux
in the embodiment as shown in the drawing has
so as to be operated individually when electrical
the opposite direction to the constant flux pro
impulses are sent through one of the two motor
duced by the magnet and forces this to take an
windings corresponding to these rotors.
other path. The ?ux of the motor winding X5
The invention will be explained more in detail
with reference to the accompanying drawings. 25 will now be closed over the one of the armature
Figs 1-4 show di?erent electrical switching dia
grams for a rotor according to invention, and Fig.
5 illustrates an example of the structure of the
motor with connections similar to those shown
in Fig. 3. In this ?gure only those parts of the
motor are shown as being of importance for a
better understanding of the invention.
The motor shown in Fig. 5 has two rotor shafts
5|, 52 of magnetically conducting material. The
shafts are interposed in a yoke 53 and in not
shown parts of the motor. Each shaft 5!, 52 is
provided in one of its end points with a cam disc
54 or 55 respectively of insulating material with
three teeth which, at the turning of the corre
sponding shaft, actuate a common self-inter
rupter A5 which is ?xed to now shown parts of
the motor frame. A circuit passing over this in
terrupter A5 is broken a brief moment every time
a tooth on any of the discs 54 or 55 actuate the
poles which is immediately adjoining the nose of
the pole piece 62 and over the iron core 6'! and
the yoke 53. The armature 56 then turns a ?rst
step 60°, one of its poles thereby being centered in
front of ‘the pole piece 62. As soon as the impulse
through winding X5 ceases, only the permanent
?ux from magnet 58 remains which then is closed
anew through the rotor shaft 5!. The armature
now turns a second step 60° in the same direction
as before until one of its poles arrives right in
(a) L1» front of the pole piece 59.
The armature now
has moved an entire angular step 120°. For each
subsequent impulse the turning of the armature
takes place in the same direction (clockwise) and
in the manner now described.
second rotor 51, which remains motionless
during the above described operation, will be
actuated in the same manner as the rotor 56.
when impulses are emitted over winding Y5 on
interrupter. A rotor consisting of a three-part
shaft 52. This armature is namely traversed—as
ed armature 56 or 51 respectively is ?xed on every
is the case with the armature 56-by a constant
magnetic flux originating in the permanent mag
net 58. However, the noses of the pole pieces 60
and. 63 are located so that the armature 51 will
shaft 5|, 52. The stator of the motor contains a
permanent magnet 58 common to the armatures
which magnet has a north pole N and a south
pole S. The magnet has a pole piece 59 and 60 60 rotate in opposite direction (counter-clockwise)
to the armature 56.
respectively for every rotor and these pole pieces
Ampli?cation of the magnetic e?icacy from
are provided as usual with noses to indicate the
direction of rotation. Moreover, the stator con
sists of a core Bl common to the rotors and ?xed
winding X5 and Y5 respectively is achieved if
winding S5 around the core 6| is energized si
in the yoke which core also carries a pole piece 66 multaneously with winding X5 and Y5 respec
tively, producing a magnetic flux co-operative
the selector contact arm 32. When this contact
arm during the motion of the selector encounters
a contact 33 connected to battery positive, a cir
cuit is closed through test relay R2 which im
with the flux from that winding. The winding
S5 is connected in series with each of the wind
ings X5 and Y5. Since the core BI is common to
the two rotors 56 and 51 and is located sym
metrically in relation to the shafts 5| and 52, a
mediately breaks its contact 35 and thereby also
the circuit over windings Y3 and S3 and over the
flux produced by the winding S5 will be closed
self-interrupter A3. The selector then. stops im
over the two armatures 56 and 51, even if only
mediately. Should thereafter the relay RI receive
one winding X5 or Y5 is energized. Hence, the
current it connects the winding X3 to the driving
winding S5 should be dimensioned so that the flux 10 circuit. As soon as the latter again is energized
passing over the rotor being inactive at the time
over not shown devices, the second rotor of the
does not actuate the rotor which has to remain
selector will be operated. This movement is
inactive during the movement of the other rotor.
Should battery positive in the embodiment ofv
the motor windings as shown in Fig. 5 be con- Y
nected to a conductor ‘H leading to winding X5,
stopped in a manner described in connection with
break of the circuit through winding Y3.
Fig. 4 shows a device for operation of an auto
matic selector with two directions of movement
both by impulses from a dial F and by impulses
over a self-interrupting contact A4. The relay
employed for connection of the various rotor
20 windings X4 and Y4 is in this example named R4.
If now positive is connected to the upper contact
spring in interrupter A4, the condition will be the
same as described in connection with Fig. 3. If
instead the dial F is set in rotation, impulses from
the position of relay R4 shown in the ?gure will be
sent through windings X4 and S4 and the cor
responding rotor will be set in rotation in analogy
with the number of impulses emitted over thedial.
As soon as the second rotor is to operate, the relay
, 30 R4 will be actuated in known manner.
and negative battery to the self-interrupter A5,
a circuit will be closed through winding X5, wind
ing S5 and over the self-interrupter A5.. As de
scribed above the armature 56 will now turn
clockwise. However, the cam disc 54 on shaft
51 is so disposed that, as soon as the shaft 5| has
turned almost 60°, it breaks the contact between
the two contact springs of the self-interrupter,
thus causing interruption in ‘the circuit over
windings X5 and S5. Thusthe rotor 55, being
in?uenced by the constant magnetic flux, will
turn a further 60°. At the termination of this
movement the cam disc 54 is turned out of gear
with the contact springs of the self-interrupter
which again close the circuit through windings
X5 and S5. With the aid of this self-interrupt
I claim:
ing arrangement the rotor 56 will be set in con
tinuous rotation as long as battery positive is kept
connected to conductor ‘H.
The rotor 51 is set in rotation in the same man
ner as battery positive is connected in to a con
ductor 12, this being associated with winding .Y 5.
The windings of the rotor may be disposed and
1. In an electro-magnetic motor for driving
teletechnic devices, two rotors, a motor winding
for each rotor operative when energized to effect
a step~wise movement of the related rotor, and
magnetic means common to both said rotors and
exerting a constant magnetic in?uence on said
rotors, said means being operative when either
winding is de-energized to effect a second step
connected to the self-interrupter in various man- 40
. wise movement of the related rotor.
ners. Examples hereof are given in Figs. 1-4, in
2. An electro-magnetic motor as claimed in
which the designations Xl-—X4, Yl-Y4 and
claim 1 wherein a rigid support is arranged about
SI-S4 indicate windings corresponding to wind
ings X5, Y5 and S5 respectively in Fig. 5.
Fig. 1 illustrates asimple embodiment without
winding encircling the core common to the rotors,
and Fig, 2 an embodiment, in which the winding
corresponding to winding S5, Fig. 5 has been di
vided into two parts windings X2 and Y2, respec
tively, whereby entirely divided circuits in?uenced
each motor supporting the related winding.
3. An electro-magnetic motor as claimed in
45 claim 1 wherein each winding acts on the related
rotor in opposition to said means.
4. Arrangement according to claim 1, wherein
the rotors are so disposed in relation to the con
stant magnetic flux from the magnetic means and
50 to the ?ux produced by the windings that the
by the two rotors are obtained.
varying flux produced at the operation of one
In Fig. 3 the windings X3, Y3 and S3 and self
rotor does not set the other rotor in operation.
interrupter A3 are connected in a manner similar
5. Arrangement according to claim 1, wherein
to corresponding parts in Fig. 5. The cam discs 54
the magnetic means common to the rotors has a
and 55 in Fig. 5 correspond to the details marked
pair of pole pieces for each rotor.
34 and 35 in Fig. 3. Fig. 3 shows likewise an ex 55
6. Arrangement according to claim 1, wherein
ample of a circuit arrangement for the motor
a stator core is provided with a winding which
when used as a driving device for a line-?nder
is connected in series with each one of the two
with two directions of movement. In the ?gure
RI is a relay which is operated when the move
'7. Electro-motor according to claim 1, wherein
ment of direction of the selector is to be altered,
the windings are connected in parallel to a self
in which case it operates its contact 3|. This
interrupting contact which is common to them
relay is operated by devices not shown 0n the
and which may be operated by any of the cam
drawing. Fig. 3 comprises also the test circuit for
discs which are mounted on the rotor shafts.
one of the directions of movement of the selector.
That circuit passes over test relay R2 and over
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