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Патент USA US2128094

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Aug. 23,1938.
Filed Nov. 24. 1937
Joseph F/ToI/a/Jk -
Patented Aug. 23, 1938
Joseph F. Kovalsky, Turtle Creek, Pa., assignor _ .
to Westinghouse Electric & Manufacturing‘
Company, East Pittsburgh, Pa., a corporation of
Application November 24, 1937, Serial No. 176,239
6 Claims. (Cl. 171-229)
My invention relates to vibrating regulators, upon a predetermined energization_of the core
l2, su?icient to oppose the pull of the spring IS,
such as are used for governing the excitation of
a dynamo-electric machine to maintain an elec
tric quantity, such as voltage, at a predetermined
value.‘ In such regulators, a vibrating relay is
the armature is moved to a circuit-interrupting
A secondary relay Il may be provided having
a core l8 and an armature i9 carrying a movable
a regulating resistor, or a portion thereof, to contact member 2i that is adapted to engage
a ?xed contact member ‘22 to close a circuit
vary the resistance in circuit with the field wind
ing of the generator alternately above and below ' through conductors 23 and 2| in shunt relation
10 the correct resistance value for maintaining the to the ?eld controlling resistor 5. A spring 25 10
caused to operate to intermittently short circuit
regulated quantity at the desired value. The ef
iective value of the resistor is determined by the
ratio between the intervals of time during which
the resistor is short circuited and the intervals
15 of time during which the short circuit is removed.
It is' desired to provide such regulators with
means for anticipating the corrective action
caused by a change in the ?eld excitation of the
generator prior to a completion of this action at
20. the terminals of the generator, in order to prevent
over-travel in the corrective in?uence. Such'cor
rective forces or anti-hunting means have in the
past been determined in small regulators by the
voltage drop across the ?eld resistor which varies
25 as the necessity of different ?eld current value
varies, as would be the case when the voltage or
load on the generator changes.
It is an object of my invention to provide a
generator voltage regulator having anti-hunting
30 means for in?uencing the primary relay control
is provided for biasing the armature l9‘ to a cir
cuit interrupting position, the armature being
moved to a circuit closing position by the mag
netizing in?uence of the core it upon engage
ment of the primary relay contact members H 15
and ii to complete a circuit from the source of
energy 26 through the secondary relay winding 21.
An energy storing device, illustrated as a con
denser 28, is connected between a junction point p
29 in the ?eld winding circuit and a junction 20
point 30 in the primary relay control circuit.
The junction point 29 lies between the ‘generator
?eld winding 4 and the ?eld controlling resistor
5, and the junction point 30 is between the pri
mary relay winding ‘I, and the control circuit 25
resistor I.
It will be appreciated that the energization of
the primary relay core by the winding 1 is a
measure of the voltage between the supply con
ductors 2 and 3. If the voltage between con 30
ductors 2 and 3 falls below the desired value, the
element to provide the same amount of anti
hunting over the entire load and voltage range pull of the spring it will be greater than the de
creased pull on the relaycore caused by ener
to be controlled.
Other objects and advantages of my invention gization‘thereof by the winding 1 and will e?fect
will appear from the following description of the engagement of the primary relay contact
members It and I5. This causes operation of
one preferred embodiment thereof, reference be
ing had to the accompanying drawing in which ' the secondary relay I‘! to its circuit-closing posi
tion to shunt the control resistor 5 from the ?eld
the single ?gure is a diagrammatic view illus
winding circuit and apply a voltage thereto cor
trating the same.
responding to the voltage between the supply con
Referring to the drawing, a direct-current gen
erator is illustrated having an armature winding ductors 2 and 3.
The increase in voltage applied to the gen
I, connected ‘to supply circuit conductors 2 and
3 and a ?eld winding 4 connected between these erator ?eld winding causes the voltage output
from the armature winding I to increase, thus
conductors in series with a ?eld controlling re
increasing the voltage between supply conductors
J sistor 5. Means for controlling the ?eld excita
tion is provided comprising a primary relay 8 2 and 3 and the energization of the primary re
having a winding 1, one terminal of which is lay winding 1, which upon a predetermined valuev
connected to the supply conductor 2 and the of generator voltage, will move the armature l3
other terminal of which is connected through a against the bias of the spring I‘ to separate the
control circuit resistor 8 to the supply conductor
contact members it and I5, thus causing the
3. The primary relay 6 also comprises a core , deenergizationof the secondary relay I‘! to in
terrupt the circuit through the relay contact
12 and an armature l3 carrying a movable con
tact member II that is adapted to engage a ?xed members 2| and 22' in shunt relation to the reg
contact member ii. The armature i3 is biased ulating resistor 5 to ‘reintroduce this resistor in
55 by a spring It to a contact‘engaging position and . series circuit relation with the generator ?eld 56
winding 4 to again decrease the energization
thereof. This intermittent vibratory action con
itinues in a well-known manner to alternately
shunt the control resistor 5 from the ?eld wind
ing circuit and reintroduce it into the ?eld wind
ing circuit for short intervals of time, the ratio of
time between the exclusion of the resistor 5 from
the ?eld winding circuit and the inclusion of the
resistor I in the circuit determining the effective
10 value of the resistor U in controlling the current
in the winding 4.
The description of the operation of the regu
lating system thus far made has neglected the
e?ect of the condenser 28 which is charged to a
15 degree depending upon the voltage impressed
across its terminals.
If the voltage across the
terminals of the condenser 28 is maintained con
stant for a short interval of time, until the charge
on the condenser 2| has adjusted itself to a value
20 corresponding to the terminal potential, no charg
ing or discharging current will ?ow. If we assume ‘
that the conductor 2 is the positive conductor
and the conductor 8, the negative conductor, and
contact members II and I! and the secondary
relay contact members 2i and 22 are brought into
engagement and separated from engagement at
earlier times in the regulating cycle upon a de
crease or increase, respectively, in the voltage of
the regulated generator on account of the stabiliz
ing or anti-hunting action of a charging current
?owing to the condenser 28 and a discharging
current flowing from the condenser 28, as above
described. This stabilizingior anti-hunting ac
tion is independent of the load on the regulated
generator and is the same for all conditions of
the circuit within the limits for which the regu
later is adjusted.
~ Many modi?cations in the arrangement of parts
will occur to those skilled in the art within the
spirit or my invention and I do not wish to be
limited otherwise than by the scope of the ap
pended claims.
I claim as my invention:
1. In a regulator system, a dynamo-electric
machine for supplying unidirectional current to
circuit supply conductors and‘ provided with a
?eld winding, a ?eld energizing circuit including
said ?eld winding and a ?eld controlling resistor
25 tacts in their illustrated or circuit-opening posi-, 1 connected in series between said supply conduc
tion, no'charging current is ?owing to or from
tors, a primary relay 'for intermittently short cir
the condenser 20, the generator voltage will de
crease in the manner above described until the ouiting said resistor tor controlling the eilective
primary relay 8 closes its contacts to cause the value thereof, a control circuit including the op
erating winding of said primary relay and a con 30
30 secondary relay l1 to connect the junction point trol circuit resistor, and anti-hunting means com
2| to the supply conductor 3 through secondary
prising a condenser connected from aJunction
relay contact members 2| and 22. Upon the clos
ing oi’ the secondary relay contact members the point between the ?eld winding and the regulat
potential between the junction points 28 and Il ing resistor and a junction point between the pri
changed by the voltage drop appearing across mary relay winding and the control circuit re
the resistor 8, thus causing charging current to
2. In a regulator system, a dynamo-electric
?ow from conductor 2 through the relay winding
‘I and the condenser 20 to the supply conductor I, machine for supplying unidirectional current to‘
which charging current starts to flow immediately supply circuit conductors and provided with a
?eld winding, a ?eld energizing circuit including
upon the engagement oi’ the secondary relay con
40 tact members 2i and 22 or before an appreciable said ?eld winding connected to one of said con
increase in the generator voltage has had time ductors and a ?eld regulating resistor between
to result from the increased potential applied to said ?eld winding and the other of said supply
the ?eld winding I due to the inherent time lag conductors, a regulating relay having a winding
for intermittently short circuiting said control
characteristics of the ?eld winding. This charg
45 ing current increases the energization of the resistor, a control circuit for connecting said
relay winding ‘I to a value sufficient to cause relay winding to the ?rst named of said icon
separation of the contact members I‘ and Ill ductors and including a control circuit resistor
between said relay winding and the other of said
prior to the time that this would occur if con
trolled by the voltage between supply conductors conductors, and a condenser connected between
2 and I alone, thus introducing a stabilizing or said ?eld winding and said relay winding.
3.'In a regulator system, a dynamo-electric
anti-hunting action into the regulator to limit the
for supplying unidirectional current and
amount of over-travel in the voltage between con
provided with a ?eld winding, a ?eld energizing
ductors 2 and 2.
The separation or the contact members II and circuit including said ?eld winding and a ?eld 55
it causes the separation of the secondary relay \ controlling resistor connected in series between
the terminals oi said thmamo-electric machine.
contact members 2i and 22, to reintroduce the regulating
means including a relay for e?ecting
resistor i in circuit with the ?eld winding l and,,
at the same time, to reestablish the potential the intermittent short circuiting of said ?eld con
resistor, a control circuit including the 00
,di?erence between Junction points 2! and 30 trolling
winding of said relay and a control circuit re
which are the terminals of the condenser 2!, to
their former value, thus causing the charge that sistor connected in series between the terminals
oi’ said dynamo-electric machine, and energy
has been established on the condenser 22 to dis
means connected between said'} ?eld wind
sipate itself by a current ?owing in the opposite storing
ing and said relay winding that is responsive to
direction, or ~from condenser 28 through the relay ' a change in the voltage supplied to said ?eld
winding 1 in a direction opposite to the ?ow or .winding Ior ei‘lecting a stabilizing current through
that for an instant represented by the relay con
the regulating component of current through that
winding between conductors 2 and 3. This causes
a decrease in the energization of the winding ‘I
iaster than it would ‘occur were it controlled
solely by the decreasing potential between con
ductors 2 and I resulting from the reintroduction
the relay winding.
'4. In a regulating system, a dynamo-electric
machine having a ?eld winding, an energizing 70
circuit for said ?eld winding, means for control
ling t‘ne energization'oi said ?eld winding com
prising a regulating relay having a winding con
. of the control resistor 5 in circuit with the ?eld ‘
between the terminals 0! said machine,
winding 4.
and anti-hunting means comprising an energy
storing element connected in a loop circuit in- ‘ ing a ‘stabilizing vcomponent of current to ?ow ’
eluding said field winding and said relay winding . through said relay winding upon a change in th
for introducing a component of current into said voltage applied to said ?eld winding. .c
relay winding upon a change in the voltage ap
6.v In a regulating ‘system; a dynamo~electric
plied to said field winding in a direction to stabi
machine having a field winding connected in cir
lize the relay winding current sooner than would cuit between the terminals thereof, said, circuit
a be effected by the corrective regulating action including a regulating resistor for adjusting the
voltage applied to the ?eld winding, 9. regulating
5. In a regulating system, a dynamo-electric relay for intermittently short circuiting said regu- .
lating resistor having an operating winding con
10 machine having a field winding connected‘ in cir
cult between the terminals thereof, said circuit nected‘ between the terminals of said machine,
including a regulating resistor for adjusting the a condenser, and means operative upon the short
voltage applied to the field winding, a regulating circuiting of said regulating resistor for connect
relay for controlling said regulating resistor and ing said condenser in series circuit with said
having a winding connected in a control circuit relay winding to effect the ?ow of charging cur
rent to the condenser through the winding.
between said machine terminals, and energy stor
ing means connected in a loop circuit for caus
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