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Патент USA US2117875

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May 17› 1938.
w. F. EAMES
2,117,875
CONTROL SYSTEI
Filed Dec. 24, 1935
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May 17, 1938.
w. F. EAMES
&117,875
CONTROL SYSTEM
Filed Dec. 24, 1935
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P?tented May 17, 1938 I
UNITED STATES PATENT OFFICE
%117375
CONTROL SYSTEM
William F. Eames, Pittsburgl?, Pa., assi?nor to
Westingho??se Electric Elevator Company, Chi
cago, lll., a corporatio?? of Illl??ois
Application December 24, 1935, Serial No. 56,007
15 Claims. (Cl. 172-239)
The speed of the motor is varied as set forth
My invention relates generally to electrical
control systems and it has particular relation to by changing the fiux present in the ?eld struc
a system which may be employed for controlling ture of the generator. This change is effected by
the functioning of a generator ?eld or Ward - altering the ?ow of current through one of the
field windings of the generator by means oi' a O
5 Leonard control system as applied to elevators.
controller. Ordinarily, the controller will be pro
. In a generator field or ward-Leonard control
system for operating elevator cars, a motor is vided with several steps by means of which
provided which is operatlvely connected to move changes in speed may be effected. At each step
a car in the hatchway. The armature of the of the controller there is a predetermined speed
at which the motor should run. Any departures
10 motor is connected in loop circuit to the arma
ture oi' the generator. The field structure of the from the. various speeds corresponding to the
different points of the controller may cause the
motor is energiz?d from a separate source of ex
citation which, in many instances, may be a elevator car to operate improperiy, particularly
constant source of energization. In order to vary when the deceleration period is considered pre
15 the speed at which the motor operates and to paratory to stopping the elevator car at a ?oor.
The object of my invention, generally stated,
reverse its direction of rotation, the fiux in the
field structure of the generator is varied and is is to provide a control system for a direct-cur
rent generator used in a ward-Leonard or gen
reversed.
As the current increases in the loop circuit erator ?eld control system which shall be simple
and efficient in operation and which may be
20 connecting the armatures of motor and genera
readily and economically manufactured and in
tor, there is a corresponding increase in the volt
.
age drop due to the resistance of the circuit. stalled.
The principal object of my invention is to pro
In order to compensate for this resistance drop,
a series field winding has been provided in the vide for maintaining the voltage of a direct,
current generator at the different predetermined
25 past on the field structure of the generator. The values corresponding to different settings of the
generator ?ux is then modi?ed as a function of
generator ?eld controller.
the loop circuit current, and, as a result, a com
An important object of my invention is to pro-`
pounding action to a certain degree takes place
so that the voltage at the motor terminals may vide for maintaining a predetermined relation
be more nearly constant than would otherwise be between the output current and voltage of a
direct-current generator and the setting of the
the case.
V
When a series ?eld winding is employed, it is generator ?eld controller.
A further object of my invention is to provide
adjusted to take care of' average or normal con
ditions in the loop circuit. In the event that a for automatically compensating for changes in
the voltage of a generator above and below a pre
~ condition occurs which tends to upset these nor
determined desired value by applying a correc
mal conditions, then the corrective effect intro
duced by the series field winding is not such as tive action in the field structure of the generator
to a?ord the required corrective action. The as a function of the actual generator voltage and
changes in the conditions from the normal cr current and the current fiowing through the
control ?eld winding of the generator.
40
40 average conditions are caused by change in re
Still another object of my invention is to pro
sistance of the conductors forming the loop cir
vide for maintaining the voltage applied to the
cuit due to a temperature rise therein. Fur
armature of a motor by the generator in a gen
. ther departures from the average or normal con
ditions are caused by changes in brush drop at erator field or ward-Leonard control system at
45 the commutator of either the motor or generator different predetermined values corresponding to
different settings of the generator ?eld controller
or both. The wear on one or both of the com
regardless of variable characteristics of the sys
mutators of the machines also introduces an
other variable factor. As the commutators wear, tem which would otherwise affect the voltage
they may introduce differences in the resistance applied to the motor, thereby maintaining dif
ferent predetermined speeds of the motor corre
50 of the conductors forming the loop circuit due to
sponding to different controller settings.
high mica between the bars of the commuta
Other objects of my invention will in part be
tor. In addition, certain variations are also
obvious and in part appear hereinafter.
caused by changes in resistance of the field wind
My invention accordingly is disciosed in the
tags of the generator and motor due to increase
embodiment hereof shown in the accompanying u
u in temperature.
2
%1173875
drawings and comprises the features of con'st?'uc
tion, combination of elements and arrang?ment.
of parts which will be exempli?ed in the con
struction hereinafter set forth, and the scope of
the application of which will be indicated in the
appended claims.
. For a more complete understanding of the na
ture and scope of my invention, reference may
be had to the following detailed description taken
10 in connection with the accompanying drawings,
in which:
Figure 1 illustrates diagrammatically the ar
rangement of an elevator car in a hatchway;
Fig. 2 is a view, in side elevation, of a con
15 troi relay used in practicing my invention;
Figs. 3 and 4 illustrate respectively, the ar
rangement of the armature and ?eld windings
of the generator and the regulator generator used
in practicing my invention;
20
Fig. 5 illustrates diagrammatically the circuit
connections which may be empioyed; and
Fig. 5A illustrates the relationship between
certain of the various Operating windings and
contact members of the relays and switches illus
25 trated in Fig. 5.
According to my invention, I have provided
means for controlling the operation of the gen
erator of a generator ?eld or ward-Leonard con
trol system, the motor of which is operatively
30 connected to move an eievator car in a hatchway.
The generator is provided with three ?eld wind
ings,-a control ?eld winding, a compounding
?eld winding, and a correcting ?eld winding. The
control ?eld winding is arranged to be connected
through a generator ?eld controller to a control
source. By varying the flow of current through
the control ?eld winding with the ?eld controller,
the voltage generated in the generator armature
is varied and accordingly the voltage applied to
40 the motor armature is varied. The current ?ow
ing through the compounding ?eld winding is ob
tained from a regulator generator, the ?eld wind
ing of which is connected in series circuit rela
tion with the loop circuit connecting the arma
45 tures of the motor and generator. Thus, the
current ?owing through the compounding ?eld
winding is a function of the loop circuit current.
The correcting ?eld winding is divided into two
sections so that they may be connected to either
50 increase or decrease the combined e?ects of the
members are operated to so connect the correcting
?eld-winding that it will oppose the,action of
the control and compounding ?eld windings with
the result that the voitage generated by the gen
erator will be decreased. The control relay is
preferably of a sensitive type so that it may
readily alternate between these two positions and 10
thus maintain a predetermined relationship be
tween the voltage applied to the loop circuit by
the generator and the setting of the generator
?eld controlier.
Referring now particularly to Fig. 1 oi' the
drawings, the reference character III designates
generally an elevator car which may be support
ed in a hatchway or shaft by means of a cable
I I which is passed over a sheave !2 and baianced
by suitable counterweights !3. The elevator car
?o is provided with a slowdown inductor switch
E and a landing inductor switch F. The slow
down inductor switch E is provided with normally
closed contact members El and Ez, while the
landing inductor switch F is provided with nor
mally closed contact members FI and F2. When
the Operating winding of the slowdown inductor
switch E is energized, no action takes place until
the contact members El or EZ come into proxim
ity respectively with the inductor plates UE or DE 30
depending upon the direction of travel of the
eievator car. Assuming that the eievator car ill
is traveling upwardly and that the Operating
winding of the slowdown inductor switch E is
energized, the contact members El will be opened
as soon as they are moved into proximity with
the inductor plate UE.. A resulting control func
tion then takes place which will be set forth in
detail hereinafter. The contact members FI and
F2 of the landing inductor switch F are also 40
opened when they come into proximity respec
tively with the inductor plates UF or DF. It
will be understood that each ?oor is provided with
a set of inductor plates so that the elevator car
may be decelerated and stopped at each ?oor.
It will also be observed that _the eievator car is
provided with a master switch MS having three
positions, the extreme outer positions correspond
ing to up and down movement of the car and a
of the generator. The control relay is further
central position to a position to stop the car.
In order to operate the eievator car ?o in the' 50
hatchway, a ward-Leonard control system is
provided which comprises a motor M that is
arranged to be mechanically coupled, as illus
trated, to the sheave ?z. As shown in Fig. 5 55
of. the drawings, the motor M comprises an arma
ture Ma and a motor field winding Mf, the latter
being arranged to be separately excited from
normally energized conductors Li and L2. A
brake B is provided having a brake releasing
winding Bw for releasing it on energization of
the motor M.
The motor M is arranged to be energized by
means of a generator G having, as shown in Figs.
3 and 5, an armature Ga, a compounding ?eld
winding Gj I, a control ?eld winding GIZ, and a
provided with contact members which are ar
correcting ?eld winding Gl3. The armature Ga
control and compounding ?eld wlndings.
In order to maintain the voltage of the gen
erator at a predeterm?'ned value regardless of
variations in Operating characteristics, a control
55
If the e?'ect of the relay voltage winding pre
dominates over the combined ??ects of the relay
current and control winding, then the contact
relay is provided having three main Operating
windings. One of these windings, a current wind
ing, is connected in series circuit relation with the
compounding ?eld winding and thus is responsive
to the current ?owing in the loop circuit. The
60 relay is provided with another ?eld winding, a
control winding, which is connected in series cir
cuit relation with the control ?eld winding. The
control relay is provided with a th?'rd winding,
a voltage winding, which is connected across the
65 loop circuit and thus is responsive to the voltage
ranged to selectively connect the corrective ?eld
winding to a source of control current. When
70 the combined effects of the current and control
windings predominate over the effect of the volt
age winding, the contact members are operated
to so connect the correcting field winding that
a ?ux is generated which is additive to the effect
75 of the control and compounding ?eld windings.
of the generator G is arranged to be mounted on
a shaft H which may be driven by any suitable
motive means, such as an induction motor, (not 70
shown) , that may be connected to an alternating
current source of supply.
i
In order to energize the compounding ?eld
winding Gfl, a regulator-generator R is provided
having an armature Ra which may be mounted
&117375
on the shaft II. as is shown in Fig. i of the
drawings. The reguiator-generator R is pro
vided with a series ?eld winding Ra which is con
nected in series circuit relation with the loop
circuit connecting the armatures oi' the motor M
and the generator G. The arrangement and
connections of the armature Ra and the series
field windlng Rs of. the regulator R. are shown
in Flgs. 4 and 5 ot the drawings. It will be
'10 understood that the current nowing through the
compounding ?eld winding G/l will be a iunction
of the current ?owing in the loop circuit since
the regulator-generator R is excited by the series
?eld winding Rs.
In response to the operation oi' the master
switch MS, up or down reversing switches U or D
are operated depending upon the direction of
movement oi' the master switch. On operation
ot either the up or the down switch, an auxiliary
~20 switch x is operated to prepare a circuit for
energizing the Operating windings oi' the inductor
switches E and F'. The auxiliary switch is also
e?ective to complete certain control circuits
which will be described hereinatter.
25
g As soon as the up or down switch U or D is
operated, a potentiometer P is connected between
the conductors LI and L2. The current ?owing
through the potentiometer P is in one direction
when the up reversing switch U is energized and
30 it ?ows in a reverse direction when the down
reversing switch D is energized.
.
In order to accelerate the motor M, the cur
rent ?owing through the control ?eld winding
Gi! is increased by increasing the voltage applied
thereto from the potentiometer P. This voltage
is graduaily increased by the successive closure
oi' contact members C! through C? which are
arranged to be successively closed and opened by
means of a control motor shown generally at CM.
40 As shown. the control motor CM is provided with
an armature CMa and a separately excited ?eld
winding CM! connected between the conductors
LI and L2. The direction of rotation of the
control motor CM is controlled by means of a
45 speed relay V which is energized on operation of
either the up or down reversing switch U or D.
In order to stop operation oi' the control motor
CM after it has reached its limit of travel, con
tact members co and CID are provided. The
contact members CIII are arranged to remain in
the closed positions, as illustrated in Fig. 5 oi' the
drawings, until the control motor has reached
its limit of travel after being initially energized.
at which time contact members CC are clowd and
full excitation is applied to the control field
winding G?. At this time, contact members
CII are opened to terminate further motion of
the control motor CM in this direction.
3
_
_winding Gj! is provided with two sections a
and b. The correcting ?eld winding is arranged
to be oppositely connected to the conductors LI
and L! by means oi' a control relay CR, the con
stru'ction oi' which is illustrated in Fig. 2 of the
drawings, and the circuit connections 'oi' which
are shown in Fig. 5 oi' the drawings. As shown
in the drawings, the control relay CR compriaes a
!rame !I tormed by two opposed E-shaped mag
netic circuits !I and 22. An arm 23 is mounted 10
on the !rame 20 and is pivoted at ZI. It carries
a contact member Cm which is arranged to en
gage the left~hand contact member CI or the
right-hand contact member Cr. The arm !l is
provided with moving coils C' and C", which may 16
be connected in series circuit relation and be
tween the conductors LI and L! when either the
up or the down reversing switch U or D is ener
gized. It will be observed that the !rame !I has
mounted therein a relay current winding CRI and
a relay control winding CRI, while the !rame 22
has mounted therein a relay voltage winding
CR3.
v
It will be recalled that the compounding field
winding G/I is connected in series circuit rela
tion with the armature Ra of the regulator-gen
erator R and that the ?eld winding Rs' of the
regulator-generator R is connected in series cir
cuit relation with the loop circuit. As illustrated
in Fig. 5 of the drawings, the relay current 30
winding CRI is connected in series circuit rela
tion with the compounding field winding G/I
so that the current ?owing through: this relay
winding is a function of the current ?owing
in the loop circuit connecting the armature of 36
the motor M and the generator G. The relay
control winding CR2 is connected in series cir
cuit relation with the control ?eld winding Gj!
of the generator G. The ?ux generated there
by is, therefore, a function oi' the current fiowing
through the control ?eld winding G/2, and thus
for every di?erent setting of the potentiometer
P, a different value of current ?ows through the
relay control winding CR2.
The relay voltage
winding CR3 is connected through a resistor rë
45
across the loop circuit connecting the motor M
and the generator G. The ?ux generated by
this winding is then a function of the voltage
generated in the armature Ga or the voltage
which is applied to the armature of the motor Ma.
It will be understood that the combined ei' 50
fects of the relay windings CRI and CRZ oppose
the e?ect of the relay winding CR3. The con
tact member Cm assumes a. position then, either
in engagement with the contact members CI or
the contact members Cr or between them de
pending upon the relative energizations of the
At the . relay windings CRI, CRZ and CR3.
time that the control motor CM was initially
The
contact members 09 are arranged to remain in
the closed position until the control motor CM
has been restored to the initial position, at which
time they are opened. since the details of con
05 struction ot the control motor CM and the con
60 energized, contact members ca were closed.
tact members CI through Cl? operated thereby
form no part ot this inventlon, a detailed descrip
tion thereof will not be set torth herein. For a
detailed description of the control motor CM and
the functioning of the contact members CI
through CIII operated thereby. reference may
be had to the Kenneth M. White Patent No.
2,089,510, issued February 2, 1937, and assigned
to the assignee oi' this application.
It will be observed that the correcting ?eld
75
The contact members Cl and Cr have been
illustrated as being connected to opposite ends 60
of the correcting field winding Gf3 or to the
ends of the parts a and b, respectively. The
center point of the correcting ?eld winding Gj3
is shown as being connected to one of the con
trol conductors LI or L2 depending upon the di
rection in which the elevator car is being op
erated. While this circuit arrangement has been
illustrated for reversing the effect of the cor
recting field winding Gj3 in the generator G
by the control relay CR, it will be understood
that circuits may be provided whereby the en
tire correcting ?eld winding would be reversed
rather than portions of it.
Since such a circuit
modi?cation is well known to those skilled in
the art, it has not been illustrated herein.
4
In operation, it will be assumed that the op
Therefore, he operates the master
tor G of such value and direction as to maintain
the voltage which is applied to the armature Ma
of the motor M at different values, each of which
switch MS to the up position. As a result, a
circuit is completed for energizing the Operating
winding of the up reversing switch U. This cir
cuit may be traced as follows:
corresponds to a different setting of the control
ler. In the event that the pull exerted by the
relay voltage winding CR3 exceeds the pull exert
ed by the combined effects of the current and
erator wishes to operate the elevator car ?n
upwardly.
Ll, MS, MSU, FI, U, X, gate Contacts, door
lnterlocks, L2. At contact members US, a hold
10 ing circuit is completed for the Operating wind
ing of the up reversing switch U. The brake
winding Bw is also energized, through a circuit
which may be traced as follows:
control windings CRI and CRI, which results
from the voltage across the loop circuit being
higher than the predetermined value correspond 10
ing to the particular setting of the controller,
then contact members Cm will engage contact
members Cr to connect the part b of the correct
ing ?eld-,winding GIS across the conductors Ll
At contact members XI, in response 'to opera
tion of the auxiliary relay X, a circuit is com
pleted for energizing the compounding ?eld
winding Gfl as soon as current fiows through
the series field winding Rs of the regulator
20 generator R. The value of the current fiowing
15
through the compound ?eld winding Gfl may
be varied by means of ,the rheostat ri, as will
be readily understood.
Since the up reversing switch U was operated,
25 the potentlometer P is connected between the
conductors Ll and L2, through the following
circuit:
Ll, UI, P, U3, Li.
The control ?eld winding Gj! is then connected
and L2.
.
As shown by the arrows in Fig. 3 of the draw
ings, the ?ux generated by the part b oi the cor
recting ?eld winding Gf3 opposes the flux gen
erated by the compounding and control ?eld
windings G] I and Gli. The voltage generated by 20
the armature Ga is therefore decreased. On be
ing decreased to the proper value, the pull exert
ed by the relay voltage winding CR3 no longer ex
ceeds that exerted by the current and control
windings CRI and CEZ, and the contact member 25
Cm moves out of engagement with the contact
members Cr.
In like manner, if the voltage across the loop
circuit is lower than the value which corresponds
30 across the upper section of the potentiometer P
to the particular setting oi the controller, then 30
the pull exerted by the current and control wind
ings CRI and CRZ of the control relay CR is sui
?cient to overcome the pull exerted by the volt
is energized. ` A relatively low value of excitation
85 will be applied to the ?eld structure of the gen
age winding CR3 and contact member Cm en
gages the contact member CZ. The part a. of the
through winding CR2 by contact members Ci,
it being recalled that contact members X! are
closed at this time since the auxiliary relay X
40
erator G by the control ?eld winding Gj! and
current will ?ow through the loop _circuit to en
ergize the motor M. Since the brake B has been
correcting ?eld winding Gf3 is then energized to
released, the car ?o will move upwardly.
A further result of the energization of the up
windings Gfl and GfZ.
reversing switch U is to energize the Operating
winding of the speed switch V. The energizing
circuit for the latter winding may be traced as
Iollows:
45
Ll, U4, El, V, 1.2.
The armature CMa of the control motor is
now energized, through the following circuit:
Ll, VI, CMa„ V4, CIU, L2, and the contact mem
bers C! through Cl are successively closed and
50 opened, contact members C? being opened and
.contact members C8 being closed. As succes
sive sections of the potentiometer P are cut out,
the current ?owing through the control field
winding Gj! is increased, so that the voltage
which is generated by the armature Ga of the
generator G is increased. Due to the increased
voltage applied to the armature Ma of the motor
M, the speed of the car in the up direction is
increased. When the motor CM reaches the end
60 of its travel, contact members Cl? are opened
and no further movement thereof takes place.
For each contact member CI through CO of
the controller there is a de?nite speed at which
the motor M should operate. Any departure
!rom _this speed may introduce undesirable oper
generate a ?ux in the same direction as that gen
erated by the compounding 'and control ?eld
It will be understood that the contact member 40
Cm will be causedto vibrate rapidly by the en
gagement of the contact member Cl and the con
tact member Cr under normal-Operating condi
tions in order to provide the desired regulating
effect. It will be observed that the voltage which 45
is applied to the armature Ma of the motor M
will then be unaiIected by variable Operating con
ditions in the generator G or in other controls
as long as the variations from the normal or aver
age conditions are within the limits for which the 50
control relay CR is adapted to operate.
In order to stop the elevator car ?o at a ?oor,
the operator centers the master switch MS, there
by completing an energizing circuit for the oper
ating winding of the slowdown inductor switch E. 55
This energizing circuit may be traced as follows:
Ll, MS, STOP, E, X4, Ll.
As soon as contact members El come into prox
imity with the up inductor plate UE correspond
ing to the ?oor at which it is desired to stop. they 60
will be opened and the previously traced circuit
for energizing the Operating winding of the speed
switch V will be opened. A circuit will then be
completed for again energizing the armature
CMa of the controller motor CM, this time in the 65
ating characteristics which may cause the eleva
tor to function in an unsatisfactory manner. It
opposite direction, through the following circuit:
is, therei'ore, desirable for each of these contact
members, or stated diiferently, for each setting
of
the controller, that the speed of the motor M
70
be maintained at corresponding values. This
action is obtained through the use of the control
› Contact members Cs are then opened, contact
relay CR.
The control relay CR functions to apply a cor
75 rective action in the field structure of the genera
Ll, V3, CMa, VZ, CS, L2. `
members C'I through CZ are closed and opened
successively, and contact members CI are closed 70
to decrease the current flowing through the con
trol field winding G?Z. For each position of the
controller, after various sections of the potenti
ometer P are connected in series circuit relation
with the control field winding Gfz, the control
&117.876
relíy OR will ,function to maintain the voltage
across the loop circuit at correspondingly dif
actual excitation ot said generator is below the
hyna! value determined by said voltage-deter
ierent values. .In this manner, the speed of the s mining excitation means for energizing said ?rst'
elevator car Il will be uniformiy decreased so
that the elevator car may be stopped at the de
sired floor with a minimum of delay and also with
a minimum of discomi'ort to passengers carried
thereby.
A further result oi the deenergization of the
speed switch V is to complete a circult for ener
gizing the Operating winding of the stoppin? in
ductor switch F inparallel circuit relation with
the Operating winding of the _siowdown inductor
switch E.
As contact members FI come into
proximity with the inductor plate UI". they are
opened. and the previousiy traced holding circuit
for the Operating winding !or the up reversing
switch U is opened. As a result. the previously
traced energizing circuit for the Operating wind
ing Bw of the brake B is opened and the brake B
is applied. The potentiometer P is disconnected
from the conductors Ll and Ll, and since the
voltage is no longer applied to the armature Ma
oi the motor M, and further since the brake has
25 been applied, the elevator car ll comes to rest
at the desired iioor.
since certain changes may be made in the fore
going construction and di?erent embodiments of
the invention may be made without departing
from the scopo thereof, it is intended that all
matter shown in the accompanying drawings or
set forth in the foregoing description shall be
interpreted as illustrative and not in a limiting
ense.
` I claim as my invention:
1. In a control system for a dired; current
generator, voltage-determining excitation means
including means for varying a Component of
excitation of said generator independently of the
40 Operating condition of the generator and includ
ing compounding means responsive to the arma
ture current of said generator for varying a com
ponent of excitation as a function of load, addi
tional excitation means for said generator in
cluding correcting ?eld winding means on said
generator electrically independent of said volt
-age-determining excitation means, and relay
means effective during changing conditions when
the actual excitation of said generator is differ
ent from the ?nal value determlned by said
voltage-determining excitation means for ener
gizing said correcting ?eld winding means to
accelerate response of said generator, said relay
means being effective to substantially deenergize
55 said correcting ?eld winding means when the
actual excitation of said generator corresponds
to the ?nal value determined by said voltage
determining excitation means.
-2. In a control system for a direct current
60 generator, voltage-determining excitation means
including means for varying a component of
excitation of said generator independently of the
correcting field winding, said control means be
ing effective when the actual excitation of said
generator is above the ?nal value determined
„byl said voitage-determining excitation means for
energizing said second correcting field winding.
3. In a control system for a direct current
generator, voltage-determining excitation means
including means i'or varying acomponent oi
_excitation of said generator independently of
the Operating condition of the generator and
including compounding means responsive to the
armature current of said generator for varying 15
a component of excitation as a function of load,
additional excitation means for said generator
including a first correcting field winding on said
generator for raising the excitation thereo'f and
a second correcting field winding on said gen
erator for lowering the excitation thereof, said
first and second correcting field windings being
electrically independent of said voltage-deter
mining excitation means.- and. control relay
means effective during changing conditions when
the actual excitation of said generator is below
the final value determined by said voltage
determ?ning excitation means for energizing said
first correcting ?eld winding, said control relay
means being effective when the actual excitation
of said generator is above the ?nal value deter
mined by said voltage-deter?nining excitation
means for energizing said second correcting field
winding.
4. In a control system for a direct current
generator, voltage-determining excitation means
including means for varying a component of
excitation of said generator independently of the
operating condition of the generator and includ
ing compounding means responsive to the ai' (0
mature current of said generator for varying
a component of excitation as a function of load.
additional excitation means for said generator
including a ?rst correcting ?eld winding on said
generator for raising the excitation thereof and 45
a second correcting ?eld winding on said gen
erator for lowering the excitation thereof, said
first and second correcting field windings being
electrically independent of said voltage-deter
mining excitation means, and control relay
means responsive to the Operating condition of 50.
said first mentioned means, the armature cur
rent of said generator and the terminal voltage
thereof for controlling said first correcting field
winding and said second correcting ?eld wind 55
ing, said control relay means being e?ective dur
ing changing conditions when the actual excita
tion of said generator is below the ?nal value
determined by said voltage-determining excita
tion means for energizing said ?rst correcting 60
?eld winding, said control relay means being
eifective when the actual excitation of said gen
Operating condition of the generator and includ
erator is above the ?nal value determined by
ing compounding means responsive to the ar
said voltage-determining excitation means for
65 mature current of said generator for varying
a component of excitation as a function of load,
energizing said second correcting ?eld winding. 65
additional excitation means for said generator
including a ?rst correcting ?eld winding on said
generator, in combination, a control field wind
ing in said generator, a controller for changing
the flow of current through said control ?eld
winding, a compounding field winding in said 70
generator for raising the excitation thereof and
70 a second correcting ?eld winding on said gen
erator for lowering the excitation thereof, said
first and second correcting ?eld windings being
electrically independent of said voltage-deter
mining excitation means, and control means ef
fective during changing conditions when the
5. In a control system for a direct current
generator disposed to be responsive to the output
current of the generator, a two part correcting
?eld winding in said generator, said parts being
disposed to oppositely a?'ect the voltage, and
means' for varying the e?ect of said correcting
76
6
2,117,875
field winding, said last mentioned means being
responsive to a function of the' generator voitage
responsive to the currents ?owing through said
control and compounding field windings and to
and to a function of the current in said com
the voltage across the 'circuit interconnecting said
devices for varying the effect of said correcting
?eld winding.
pounding ?eld winding.
6, In a control system for a direct current gen
erator, in combination, a direct current motor
armature connected in loop circuit with the arm
ature of said generator; a control ?eld winding
for said generator; a controller for changing the
10 current ?ow through said control ?eld winding,
to thereby change the speed of said motor; a com
pounding ?eld winding connected in said loop
circuit disposed to be responsive to the current
?owing through the armature of said generator,
16 to modify the voltage of said generator; a cor
recting ?eld winding for said generator operabie
to vary the voitage of said generator; and means
responsive to the combined e?ect of the currents
in said control ?eld, said compounding ?eld and
control ?eld winding in said generator, circuit 10
means for connecting said control ?eld winding
to a current source, a compounding ?eld wind
ing in said generator disposed to be responsive
to the current ?owing in said loop circuit. a
two part correcting ?eld winding in said gen 15
erator, said parts being disposed to oppositely af
fect the generator voitage, and control relay
means disposed to' be responsive to the currents
?owing through said control and compounding
varying the eifect of said correcting ?eld wind
?eld windings and to the voltage across said 20
loop circuit for varying the eifect of said cor
ing.
recting ?eld winding.
20 to the voltage across said motor armature for
7. In a generator field control system, in com
bination, a direct current motor, a direct current
generator, the armatures of said motor and gen
erator being connected in loop circuit relation, a
control ?eld winding in said generator, circuit
means for connecting said control ?eld winding
to a current source, a compounding ?eld wind
ing in said generator disposed to be responsive to
the current ?owing in'said loop circuit, a two part
correcting ?eld winding in said generator, said
parts being disposed to oppositeiy a?ect the gen
erator voltage, and means for varying the effect
of said correcting ?eld winding as a function of
the voltage across said loop circuit and of the
current in said compounding field.
8. In a control system for a direct current
generator, in combination, a controi?eld winding
in said generator, a controller for changing the
?ow of current through said control ?eld wind
ing, a compounding ?eld winding in said genera
tor disposed to be responsive to the current ?ow
ing through the armature of said generator, a
45 correcting ?eld winding in said generator, and
control relay means disposed to be responsive to
the currents ?owing through said control and
compounding ?eld windings and to the generator
voitage for varying the e?ect of said correcting
50 ?eld winding.
9. In a control system for a direct current
generator, in combination, a control field winding
in said generator, a controller for changing the
?ow of current through said control ?eld wind
55 ing, a compounding ?eld winding in said genera
to?- disposed to be responsive to the output cur
rent of the generator, a two part correcting ?eld
winding in said generator, said parts being dis
posed to oppositely a?fect the generator voitage,
60 and control relay means disposed to be responsive
to the currents ?owing through said control and
compounding ?eld windings and to the generator
voltage for varying the effect of said correcting
?eld winding.
05
11. In a generator ?eld control system, in com
bination, a direct current motor, a direct current
generator, the armatures of said motor and gen
erator being connected in loop circuit relation, a
10. In a generator ?eld controi system, in com
bination, a ?rst dynamo-electric device opera
tively connected to a load, a second dynamo-eiec
tric device electricaliy connected to said ?rst de
vice, a control ?eld winding in said second device,
70 a controller i'or changing the ?ow of current
through said control ?eld winding, a compound
ing field winding in said second device disposed to
be responsive to the current fiowing between
said devices, a correcting ?eld winding in said
'i second device, control relay means disposed to be
12. In a control system for a ,direct current
generator, in combination, a control ?eld wind
ing in said generator, a controller for changing 25
the ?ow of current through said control ?eld
winding, a compounding ?eld winding in said
generator disposed to be responsive to the cur
rent ?owing through the armature of said gen
erator, a correcting field winding in said genera 30
tor, a control relay having contact members
disposed to variably connect said correcting ?eld
winding to a current source, a control winding
on said relay connected in series circuit relation
with said control ?eld winding, a current wind 35
ing on said relay connected in series circuit re
Iation with said compounding ?eld winding, and
a voltage winding on said relay connected to be
responsive to the generator voltage.
13. In a control system for a direct current 40
generator, in combination, a control ?eld wind
ing in said generator, a controller for changing
the ?ow of current through said control ?eld
winding, a compounding ?eld winding in said
generator disposed to be responsive to the output 45
current of the generator, a two part correcting
?eld winding in said generator, said parts being
disposed to oppositely affect the voltage gen
erated by said generator, a control relay having
contact members disposed to oppositeiy connect
said correcting ?eld winding to a current source,
a control winding on said relay connected in
series circuit relation with said control ?eld
winding, a current winding on said relay con
nected in series circuit relation with said com
pounding ?eld winding, and a voltage winding
on said relay connected to be responsive to the
generator voltage.
14. In a generator ?eld control system, in
combination, a ?rst dynamo-electric device oper 60
atively connected to a load, a second dynamo
electric device electrically connected to said ?rst
device, a control ?eld winding in said second de
vice, a controller for changing the ?ow of cur
rent through said control ?eld winding, a com“ 65
pounding ?eld winding in said second device dis
posed to be responsive to the current ?owing
between said devices, a correcting ?eld winding
in said second device, a control relay having
contact members disposed to variably connect
said correcting ?eld winding to a current source,
a control winding on said relay connected in se
ries circuit relation with said control ?eld wind
ing, a current winding on said relay connected
in series circuit relation with said compounding
7
„17,875
?eld winding, and a voltage wind?ng on said
reiay connected across. the clrcuit interconnect
ing said devices.
15. In a generator ?eld control system, in com
bination, a direct current motor, a direct current
generator, the armatures ofusaid motor and gen
erator being connected in loop circuit reiation,
_a control ?eld wind?ng in said generator, circuit
means for connecting said control ?eld winding
10 to a current source, a compounding ?eld winding
in said generator disposed to be responsive to
the current ?owing in said loop circuit, e. two
part correcting ?eld winding in said generator,
said parts being disposed to oppositely a?ect the
15 generator voltage, a control relay having con
tact members disposed to oppositely connect said
correcting ?eld winding to a current source, a
control winding on said relsy connected in series
circuit relation with said control field winding,
a current winding on said relay connected in
series circuit relation with said compounding
?eld winding, and a. voltage wind?ng on said re
iay connected across said loop.circuit, said volt
age winding being disposed to operate said con
tact members in such manner as to energize one
part o! said correcting ?eld winding to decrease
the e?ect of said control and compounding ?eld 10
windings and said control and current windings
being disposed to operate said contact members
in such manner as to energize the other part oi'
said correcting ?eld winding to increase the ef
íect of said control and compounding ?eld wind- 16
inss.
WILLIAM I". EADEES.
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