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Патент USA US2132277

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Get. 4, 1938.
c, E_ STEWART
2,132,277
CONTROL SYSTEM
Filed Feb. 12', 1937
Inventor‘:
Clyde )2. StQWélT‘t,
Patented Oct. 4, 1938
2,132,277
UNITED STATES PATENT OFFICE
2,132,217
‘
cou'mor. srs'ram
Clyde E. Stewart, Upper Darby, Pa" assignor to
General Electric Company, a corporation of
New York
Application February 12, 1937, ‘Serial No. 125,404
6 Claims. (Cl. 175-320)
My invention relates to control systems and to insure that the relay 8 remains in its- normally
particularly to a. system for controlling a rapid
de-energized position.
'
ly operating device such as a rotary selector
Associated with each stationary contact 2 is a
switch so that it may be positively stopped in any circuit closing device ll which, when closed, con
5 of a plurality of its positions, and one object of
nects the associated contact 2 to the source of
my invention is to provide an improved control control current so that when the wiper engages
system for accomplishing this result.
the contact 2 a low resistance shunt circuit is
My invention will be better understood from completed around the parallel connected wind
the following description when taken in connec
ings ‘I and 9. This shunt circuit reduces the
tion with the accompanying drawing, the single voltage drop across the winding 9 oi’ the magnet 10
?gure of which diagrammatically illustrates a I so that it cannot pick up and consequently fur
rotary selector switch control system embodying ther movement of the wiper 3 is prevented as long
my invention, and its scope will be pointed out in as the circuit closing device It associated with
the appended claims.
the contact 2 with which the wiper 3 is in en
Referring to the accompanying drawing, I gagement remains closed. The closing of the
represents a rotary selector switch 0! any suit
shunt circuit around the winding 1 of the relay
able type, examples of which are well known in > 6 also increases the voltage impressed across the
the'art. As shown in the drawing, the switch winding 3 so that the resultant ampere turns
includes a bank of stationary contacts 2 and a produced by the two diiferential windings ‘I and
co-operating movable wiper 3 which is arranged 8 are increased to a su?lcient value to cause the 20
to be moved into engagement with successive relay .6 to open its contacts i2 and thereby dis
contacts by‘ a ratchet 4 that is operated in any connect the resistor II from across the control
suitable manner each time an associated oper
source. Since the resistance of the winding 8 is
ating magnet 5 is de-energized.
materially greater than the resistance of the
In accordance with my invention, I provide an resistor II, the control source has to supply only
improved operating control circuit for the mag
a small current to maintain the switch in any of
net 5, whereby when a starting circuit is com
its oil-normal positions.
pleted for the winding 9 of the magnet 5, the
The operation of the arrangement shown in
winding Sis intermittently energized to' move the drawing is as follows: It will be assumed that
30 the wiper 3 to a desired contact and when the
the switch I is in its normal position as shown, 30
wiper engages this desired contact,the circuit of and that it is desired to cause the wiper 3 to
the magnet 5 is controlled in such a manner as
to insure that the wiper 3 remains on‘ the desired
stationary contact. For accomplishing this re
sult, I provide a control relay 6 which has two
di?erential windings ‘I and I. The winding ‘I is
connected in parallel with the winding 3 of the
operating magnet 5 and the winding 3 is con
nected in series with the parallel connected ‘wind
40 ings ‘I and 9 by the normally closed contacts ll
of the operating magnet 5. 'Also a resistor II is
connected in parallel with the winding I 01' the
relay 6 by the normally closed contacts l2 oi' the
relay 6. A suitable start switch i3 is provided
which when closed supplies the operating poten
tial to the circuit of the magnet winding 9.
Since the operating magnet 5 requires a rela
tively large current to operate it, the resistance
of the energizing circuit of this magnet has to
be relatively low. This result is obtained by
making the resistance of the resistor ll relatively
low, The resistance of the windings ‘I. and 3 are
made relatively high so that during the stepping
operation of the operating magnet I only a small
current ?ows through these two diilerential
windings and these two windings are also de
signed so that the resultant ampere turns pro
duced by these small currents ?owing through
them during the stepping operation of the oper
00 ating magnet 6 are substantially zero in order
engage one of its oil-normal contacts 2. The
circuit closing device H associated with this de-'
sired o?-normal contact 2 is closed so as to con
nect the positive terminal of the control source
directly to this contact 2. Then the start switch
I3 is closed to complete a circuit from the posi
tive terminal of the control source through the
switch ii, the windings 9 and 1 in parallel, the
contacts iii of magnet 5, and then to the negative
terminal oi the control source through the wind
ing I of relay 6, and also through the contacts
l2, and resistor il in series. The current in this
circuit is su?icient to cause the magnet 5 to
operate and open its contacts iii. The currents
through the windings l and 8, however, are such
that the ampere turns of the two windings are
substantially equal and opposite and therefore
the relay ‘does not operate to open its contacts
l2. The opening oi’ the contacts l0 effects the
de-energization oi the magnet 5, which in re
turning to its de-energized position, operates the
ratchet 4 to move the wiper 3 from its normal
position to its ?rst oil-normal position. As soon
as the magnet 5 has reached its normal position 55
and has closed its contacts 10, the heretofore de
scribed clrcuit through the windings 9, ‘I, 8 and
resistor II is again completed. In this manner,
the magnet 5 is intermittently energized and de
energized until the wiper 3 engages the contact
2,132,277
2
2 which is connected directly to the positive
terminal of the control source by its associated
circuit closing device l4. When the wiper 3 en
‘ gages this contact 2, a low-resistance shunt cir
cuit is completed around the windings ‘I and 9 so
that substantially the full potential of the control
source is impressed across _ winding 8 of the
relay 6. Consequently, the magnet 5 is pre
vented from operating but the relay 6 operates to
10 open its contacts I! and disconnect the resistor H
- from across the control source.
The relay 6 may also be providedwith other
one of said relay'windings connected in parallel
with said magnet winding and the other of said
relay windings connected in series with said mag
net winding, contacts in said energizing circuit,
means responsive to the energization of said mag
net for opening said last mentioned contacts, and
means for closing a shunt circuit around said
parallel connected magnet and relay windings
‘when said wiper engages a predetermined contact.
4. In combination, a rotary switch having a. 10
movable wiper and a plurality of stationary con
tacts, a magnet, means including said magnet
for movingysaid wiper into successive engagement
contacts l6 which may be connected in any suit- . with said contacts, a winding for said magnet, a
able manner so as to effect the operationof an
i control relay having two differential windings of 15
15 other control device (not shown) which it is de
sired to operate when the switch I has stopped in
an off-normal position.
While I have, in accordance with the patent
statutes, shown and described my invention as
20' applied to a particular system and as embody
ing various devices diagrammatically indicated, :
changes and modi?cations willbe obvious to those
skilled in the art, and I therefore aim in the ap-'
pended claims to cover all such changes and mod
i?cations as fall within the true spirit and scope
of my invention.
-
>
What _I claim as new and desire to secure by
Letters Patent of the‘United States is:
1. In combination, a--rotary switch having a
30' movable wiper and a plurality of stationary con
' tacts, means including a magnet for moving said
wiper into successive engagement with said con
tacts, a winding for said‘magnet, a control relay
having two differential windings, means for com
35 pleting an" energizing circuit for said magnet
winding‘ with one of said relay windings con
nected in parallel with said magnet winding and
the other of said relay windings connected in se
> ries withsaid magnet winding, means responsive
'40.
to the energization of said magnet for opening
said energizing circuit, and means for closing a
shunt circuit around said parallel connected mag
net and relay windings when said wiper engages
a predetermined contact.
‘
2. In combination, a rotary switch having a
movable wiper and a plurality of stationary con
tacts, means including a magnet for moving said
wiper into successive engagement with said con
tacts, a winding for said magnet, a control relay
having two diiferential windings, means for com
pleting an energizingcircuit‘ for said magnet with
one of said relay windings connected in‘ parallel
with said magnet winding and the other of said
relay windings connected in series with said mag
net winding, contacts in said energizing circuit,
means responsive to the energization of said mag
net for opening said last mentioned contacts, a
parallel circuit around said other of said relay
windings including an impedance, contacts in said
parallel circuit controlled by said relay, and
means for closing a shunt circuit around said par
allel connected magnet and relay windings when
said wiper engages a predetermined contact.
" 3. In combination, a rotary switch having a
movable wiper and a plurality of stationary con
tacts, a magnet, a winding for said magnet, means
including said magnet for moving said wiper into
successive‘engagement with said contacts, a con
trol relay having two di?erential windings of rel
atively high impedances, means for completing an
70 energizing circuit for said magnet winding with
relatively high impedances, means for completing
an energizing circuit for. said magnet winding
with one of said relay windings connected in
parallel with said magnet winding and the other
of said relay windings connected in series with 20
said magnet winding, contacts in said energizing
circuit, means responsive to the energization of
said magnet for ‘opening said last mentioned con
tacts, a parallel circuit around said other of said
relay windings including a relatively low imped 25
ance device, contacts in said parallel circuit con
trolled by said relay, and means for closing a
shunt circuit around said parallel connected mag
net and relay windings when said wiper engages
30
a predetermined contact.
’
5. In combination, a rotary switch having a
movable wiper and a plurality of stationary con
tacts, means including a magnet having a rela
tively low resistance ' winding for moving said
wiper into successive engagement with said con
tacts, a control relay having two differential wind
ings of relatively high substantially equal resist
ances, a resistor having a relatively low resistance
value, means for completing an energizing cir
cuit forv said magnet winding with one of said 40
relay windings connected in parallel with said
magnet winding and the other of said relay wind
ings connected in series with said magnet winding
and said resistor connected in parallel with said
other of said relay windings, contacts in said en
ergizing circuit connected in series with said re
lay windings, means responsive to the energiza
45
tion of said magnet for opening said last men
tioned contacts, means for closing a shunt circuit
around said parallel connected magnet and relay 60
windings when said wiper engages a predeter
mined contact, contacts in series with said re
sistor in the parallel circuit around said other of
said relay windings, and means for opening said
last mentionedcontacts when a predetermined 55
unbalance occurs in the energizations of said re
lay windings.
'
6. In combination, a rotary switch‘ having a
movable wiper and a plurality of stationary con
tacts, means including a magnet for moving said 60
wiper into successive engagement ‘with said con
tacts, a winding for said magnet, means for com
pleting a circuit including said magnet winding,
means responsive to the energization of said mag
net for opening said circuit, means for complet 65
ing a shunt around said. magnet winding when
said wiper engages a predetermined contact, and
means controlled by said magnet for increasing
the resistance in said circuit after said shunt is
completed.
_
CLYDE E. STEWART.
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