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Патент USA US2137721

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Nov. 22, 1938.
J. E. JQNEs
MOTOR CONTROL SYSTEM
Filed Jan. 14, 1958
2,137¿,721
Patented Novi 22, 12938
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UNITED s'rATl-:s -PATENT oFFicE
2,137,721
“
MOTOR CONTROL SYSTEM
Jesse E. Jones, Milwaukee, Wis., assignox' to Cut
-ler-Hammer, Inc., Milwaukee, Wis., acorpora
tlon of Delaware
Application January 14, 1938, Serial No. 184,964
4 Claims. (Cl. 172-179)
This invention relates to motor control systems, tionary contact 6 to connect the Operating wind
and more particularly to reversing controllers for ing 2a of reversing switch 2 across said supply
series motors having separate forward and reverse
series ?eld windings;
5
The invention has among its objects to provide
an ef?cient and reliable reversing controller for
motors of the aforesaid type having improved
dynamic braking control means associated therewith.
10
'
lines.
i
The reversing switches | and 2 are also each
prOVided With tWO Sets Of nOfmally closed con- 5
tacts c and d for controlling dynamic braking
connections forthe motor including an adjustable
resistance R, and reversing switch l is provided
_ with a set' of normally open contacts e for estab
A further object is to provide a controller for
lishing an energizing circuit for the Operating 10
motors of the aforesaid type having novel automatic means for setting up connections to provide
15 power connections for the motor and for dynamic
braking under the action of the forward ?eld
winding upon interruption of reverse power connections for the motor.
Another object is to provide a controller of the
20 aforesaid type having a single braking resistance
for regulating dynamic braking by either of the
?eld windlngs.
winding 3a of selector switch 3 through the
medium of contacts 2d of reversing switch 2.
Selector switch 3 is provided with a set of nor
mally open contacts 3b for. establishing connec
tions to provide for dynamic braking of the motor 1B
under the action of series ?eld RF and a set of
normally closed contacts 3c for, establishing con
nections to provide for dynamic braking of the
motor under the action of series ?eld FF. Selec
tor switch 3 is also provided with a set of normally 20
open contacts 3d for establishing a maintaining
circuit for its Operating winding 3a through the
Various other objects and advantages of the invention will hereinafter appear.
25
The accompanying drawing diagrammatically
medium of contacts 2d of reversing switch 2.
"
The function and operation of the aforede
scribed controller and also the circuit connections 25 .
for dynamic braking under the action of the reverse ?eld winding upon interruption of forward
illustrates a controller embodying the invention,
it being understood that various modi?cations
may bewmade in the embodiment illustrated without departing from the spirit and scope of the
30 appended claims.
therefor will now be niore fully described. Upon
movement of pilot switch 4 into engagement with
stationary contact 5 the Operating winding |a of
reverslng switch I is connected across lines L1_L2
' -and upon response of said reversing switch the 30
Referring to the drawing, the same illustrates a
direct current motor M to be supplied with cur-
contacts I” thereof connect armatura A and ?eld
winding FF in series across lines L1-L2 for opera
rent from a supply circuit 'indicated by lines
L1-'-L=, said motor being provided with ani'?arma-
tion of the motor in its forward direction. Upon
response of reversing switch l contacts Ic and Id
35 ture A, a forward series ?eld winding FF and a
reverse ?eld winding RF.
The control means for motor M includes a pair
of electromagnetic reversing switches I and _2, an
open to interrupt dynamic braking connections 33
for the motor and contacts Ib close to establish an
energizlng circuit for selector switch 3 extending
from line Ll by- conductor IO through the con
electromagnetic. selector switch 3 for selectively
40 setting up forward and reverse dynamic braking
connections for said motor, and a' pilot switch ö
tacts te, by conductor ll through the Operating
winding 3** of said selector switch, by conductor i2 40
through contacts 2d of reversing switch 2 and by
i for selectively controlling said reversing swltches.
Reversing switch I is provided with a set of nor-
mally open contacts ib for connecting armature
45 A, and forward field winding FF in series across
lines L1-L2 for forward operation of the motor
and reversing switch 2 is provided with a set of
normally open contacts 2b for'connecting armature A and reverse field winding, RF in series
conductor l3 to line L2. Selector switch 3 thus
responds'to close its contacts 3b and 3d and open
its contacts 3a
Operation of motor M in its forward direction is 45
stopped by moving pilot switch 4 out of engage
ment with its cooperating stationary contact 5 to
deenergize reverslng switch I. Reversing switch
t when deenergized drops out immediately, but
50 across lines L1-L7 for reverse operation “of the ' seiector switch 3 is maintained energized by a cir- 50
motor. ' Pilot switch i is movable in one direc- cuit extending from line L1 through conductor IO,
tion into engagement with a stationary contact 5
to connect the Operating winding I" of reversing
switch I across supply lines .LL-L2 and in an
gg; opposlte direction into engagement with a sta-`
through contacts 3a, through the Operating wind
ing 3a, by conductor _|2 through contacts 2'1 of
reversing switch 2 and by condu'ctor |3 to line L2.
a dynamic braking circuit is then' established to 55
2
'
2,18':',721
effect stopping of the motor, such circuit extend
ing from the left hand terminal of armature A
through reverse ?eld winding RF, through con
tacts 3b of selector switch 3, through contacts 2°
and i” of the reversing switches, through resist
ance R, through contacts id and 2d of the revers
ing switches, and by conductor l3 to the right
hand terminal of armatura A.
i?is herein'oefore set forth, selector switch 3 in
ing an armature and separate forward and re
verse series field windlngs, of means for selec
tively controlling power connections for the mo
tor to effect forward or reverse operation there
of, and dynamic braking control means for said
motor including switches associated with said
former means for connecting either of said field
windings in shunt with said armature upon in
terruption of power connections for said motor
responding is maintained in its attracted position
and a seleotor switch associated with said former 10
through the medium of its associated contacts
3d and the contacts 2d of reversing switch 2.
Zíowever, upon movement of pilot switch 6 into
engagement with its associated contact 6 the
lo Operating wlnding of reversing switch 2 is con
switches and controlled in accordance with the
direction of operation of said motor to provide
for connectionof said reverse ?eld winding in
shunt with' said motor 'armature upon interrup
tion of power connections for forward operation
of said motor and for connecting said forward
field winding in shunt with said armatura upon
interruption of power connections for reverse op
eration of said motor.
3. The combination with an electric motor hav 20
ing an armature and separate forward and re
nected across lines 'LI-L2 and said reversing
switch in responding opens its contacts 2d to in
terrup'; the maintaining Circuit for selector switch
8
closes its contacts '2b to connect armature
A and field winding RF in series across lines
L1_E..? for, operation of motor M in its reverse
direction. The motor continues to operate in its
reverse direction until the energizing Circuit for
reversing switch 2 is interrupted by movement
25 of pilot switch d out of engagement with. its as
sociated contact
Reversing switch 2 then drops
out and since selector switch 3 is now in normal
position the motor is stopped under the action
of a dynamic braking circuit extending from the
co co'- left hand terminal of armature A, through the
forward field windlng FF. through contacts 5°
of selector switch 3, through contacts 2G and l?
of the reversing switches, through resistance P1,
through contacts id and 2d of the reversing
switches, and by conductor il! to the right hand
terminal of armature A.
In connection wit'n the foregoing it should he
noted that a single switch sert'es to selectively
set up connections for dynamic brat-ring or" the
motor in opposite directions. also it should 'oe
noted that the oircuit arrangement provides ror
ii
the
dynam;
i
~si
'
verse series field windings, of means for selec
tively establishing power connections for effect
ing forward or reverse operation of said motor,
a single braking resistance and dynamic brak 25
ing control means for said motor including
switches associated with said former means for
connecting either of said ?eld wíndings in shunt
with said armature and in series with said re
sistance upon interruptlon of power connections 30
for said motor and a selector switch associated
with said former switches and controlled in ao
cordance with the dlrection of operation of said
motor to provide for connection of said reverse
field winding in shunt with said motor armatura 35
upon interruptlon of power connections for for
ward operation of said motor and for connection
of said forward?eid winding in shunt with said
armatura upon interruption of power connections
:for reverse operation of said motor.
'
12. The combination with an electric motor hav
rrnature and separate forward and re
ing anz*
verse
for s-lectivel?" co„
' power conne
motor to effect :forward or reverse
"
5, switches
with said reversing
swit es for oonnectin. either of' said field wind
shunt with said armature upon ir* . '
reverse serie¬ 'I
tíon
lectívely co
power connecti s for said motor, and
i'e switoiiing means for selective
said :field winoings to said iorzner
controž tlzereby, said sr .tching
~.
felno contr
`
nature up
for
by
.
_
,id reversing switches
7** connection of said r Verne field
of srid motor
for connection oi
'ard iieid wlnding in shunt with said
„,
:or W.
'o u o” 'nterruption of power conneo ions
atie-n ot
motor.
JEBÊSE
JOIHYE".
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