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Патент USA US3078402

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Feb. 19, 19-63
Filed Aug. 10, 1959
BYJ/m. é
Fetenterl Eels. 19, 196
tion following resumption of current ?ow to the pump
further objects of the invention together
with the features of novelty apwrtensnt thereto will ap
pear in he course of the following description.
In the sccornpsn‘ i'sg drawing the single FlGURE rep
resents a diagrammatic showing of a typical system em
bodying the invention.
Referring to the drawing, reference numerals 16, ill
This invention relates generally to controls for electric
motors and other electrical loads, and refers more par- 10 and 12 represent the power supply lines which are con
nected with a suitable source of alternating current (not
ticulerly to an automatic restarting arrange lent for con
shown). The supply lines are connected through switches
and 35, respectively, with the load lines l6, l7
trolling the operation of electrically driven irrigation
It is,
hes for some time been, a convent onol prac
The load lines lend to a thre phase electric
ly paw- 15 motor M which has driving connection with u. conven
tional pump P ?tted with the intake and discharge lines
cred porn 5 equipped v/l'
opcr 4d starters for
1‘? and
respectively. it will be understood that the
delivering water from a well or other s urce to a system
intake line 155 of the pump communicates with a suitable
of irrigation ditches or pipes. The ave.v ility of power
source of Water, such as a Well or the like (not shown)
through REA. facilities has facilitated and encouraged
feeds through the irriga
such systems. However, t. ere is at least one
' prob 20 and that the discharge line
tion system (also not shown).
1cm in such operations which, so for as I am. aware, hes
The switches 2.3, 14 and 15 form a part of the solenoid
not been satisfactorily solved.
operated starter for the rue-tor M, being under the control
The problem arises primarily from the fact that not
ol a solenoid 2i.
this connection it should be observed
infrequently there is a momentary interruption in the
power supply line to the pump. One of the principal 25 that the system is shown as in a condition prior to start
ing of the pump motor. The switches l3, l4 and 15 are
causes of this phenomena is lightning. The momentary
biased in conventional fashion toward the open position
power interruption has the onset of deenergizing the
illustrated, but will close upon encrgizetion of the sole
starter solenoid, thus breaking the line to load contacts
noid 2t.
forming a part thereof. in conventional systems the
Currcnt is supplied to a. solenoid 21 through a circuit
starter remains open thereafter, even though power is re
which includes supply line
conductor 22, main power
stored to the line, until the starter is manually reset.
switch 23, conductor 24-, moment'try push switch 25, con
As will be evident, unless an operator is directly at
o‘uctors Z7 and
solenoid El and conductor 29, the
hand the topping of the motor may not be detected for
tics in agricultural iri' ,tion to ‘utilize elect
latter of which connects with line 11. To prepare the
some time. This has two quite éiscoura 1g conse~
qucnces. The ?rst is that no water is pumped during the 35 starter for normal operation switch 23 is manually closed.
To start the motor, the momentary switch 125 is then
interval from shut-off to discovery. The second is that
"cpressed, which causes current to flow through solenoid
once pumping is interrupted for any enprecicblc period
211. Under the in?uence of the solenoid switches is, ill
it cannot be cilectively commenced ag
until the siphon
and £5 will close, thus closing the line circuit to the
tubes have been reset, which may tune as long as two
40 motor. The solenoid also acts upon a normally open
locking switch 361, which has the effect of locking the
It is one of the principal o‘oiects of my love
solenoid. into
energized circuit including conductor
provide a compact end fool-proof errand
(now closed}, conductors 3i. and the locl<~
matically restarting electrically powered
ing switch 3%, conductor
solenoid. El and conductor
nature describ
it is c. ‘suture of
'l‘hus the push switch
rnoy now
released with
out disrupting the supply of current to the motor.
controlled solely by elect
The circuitry as thus far described is conventional in its
general arrange-n cut and manner oi operation
It will be eviocnt that should any powc
take place in the supply lines, even of a momentary na
independent power sources su
In other words, succe
other than a change in the sup-
21 will be deco-em?‘ ed, thus permitting
Another object or‘ my invention is
s me their normal open
of restarting electrical equip-inert of he ~ - '
be closed without
which employs a 'iirnum of moi/ins p1
and which cons uently has long or,
.5; life.
Still another 0 feet 032 my invention ' to provide a
restarting system of the c
r described whercin the
restarting is controlled to
it is the purpose of my automatic starting ar
to eilcct closiuw of the solenoid switches with
the event the
ling the "'lesenceJolT an c-u eretor
time interval has elapsed following ’
power and breaking of the st ‘
nt in pun
n3 systems, as
tendency to reverse direction. {7
outcry nature.
provide a. steel
For the purposes o‘r my rnve
down transformer l which has a ll. 5J1. wincling
nectcd in Series between lines
and ll
power ijerrupti .
will rotate in the oppor'
should restarting he ii
includes line
solenoid switch
to rest, severe and end
1g equipnier‘
of my n
33, load line 17 or o. solenoid switch
s as the sole.
dent that at such
provided for prcsclccting
Z22, switch .4513
C cnductor
so’, c oriductor 27, winding
. ,
accommodate the resterter to varying
conductor Ell,
3-2, conductor
It will be evi
is energized,
or tne transformer.
former is con
nected with a r
is to provide a
A still further object of my inve'i
restartin" arrangement of
character descrii c which
is automatically restored to its normal operating condi
‘the coil
The contact
is biased toward the open posi
tion shown in solid. lines. Upon encrgizetion of coil 34
the contact assumes the position shown in broken lines,
thus closing a circuit from the rectifier through conduct-or
36, contact 35, conductor 3?’, a capacitor 38 and con
ductor 39. So long as current ?ows through the motor M
stopped, other than by power interruption, is by means
i the manual main power sw' ch 23.
From the foregoing it will be seen that this invention
is one Well adapted to attain all of the ends and objects
and thus through the winding of transformer T, contact C21 hereinabove set forth together with other advantages
35 Will remain in the broken ‘line position and the ca
pacitor will be charged by current supplied from the
which are obvious and which are inherent to the arrange
It will be understood that certain features and subcom
binations are of utility and may be employed without
It will be further observed that contact 35 is arranged
to open and close a circuit which includes the capacitor 10 eference to other features and subcornbinations. This is
contemplated by and is within the scope of the claims.
33, conductor 37, contact 35, conductor '42’), relay coil
Since many possible embodiments may be made of the
41 of the control relay and conductor 39 A variable
resistance 42 is connected across the capacitor and in
invention without departing from the scope thereof, it is
parallel therewith. The coil 41 of the control relay acts
to be understood that all matter herein set forth or shown
upon the normally open contact 43 which controls a by 15 in the accompanying drawings is to be interpreted as illus
trative and not in a limiting sense.
pass line 44 across the momentary manual push switch
25. For the purposes of this application I refer to the
Having thus described my invention, I claim:
circuit including by-pass line 44 and contact 43 as the
1. In an electrical system which includes a source of
alternating current connected through a magnetic starter
solenoid control circuit.
Assuming now that a momentary power interruption 20 to a load, the starter having a starter solenoid and
takes place, the following sequence of events occurs.
switches responsive thereto, an arrangement for automati
Starter solenoid 21 is deenergized, thus causing starter
cally reconnecting the starter solenoid with the source for
a predetermined interval and at a positively determined
switches 13, 14, 15 and 38 to open. Transformer T is
deenergized also and consequently ?ow of recti?ed cur
time delay following an interruption of the alternating
rent from the recti?er ceases. Thereupon the capacitor
current resulting in opening of said switches, said ar
commences to discharge through relay coil 34.
rangement comprising, in combination, a solenoid control
The relationship and characteristics of the operating
circuit including said starter solenoid and said source, a
control relay, said relay having a normally open contact
relay 34 and control relay 41 are important to an under
standing of the invention. The characteristics of relay
in said control circuit between said source and the starter
34 must be such that its contact 35 will return to the solid
solenoid, said contact operable upon closing of same to
line position at a time when the voltage impressed by the
electrically connect said starter solenoid with said alter
capacitor 38 is still high enough to cause the relay coil
nating current source, a capacitor, power conversion
means connected with said system through said starter
41 to close its contact 43. In other words, the relay con
tact 35 must be set to open at a high enough voltage that
and providing a second source of power at times when
the residual voltage in the capacitor, following opening
of the contact 35, will still be enough to bring about
said switches are closed, an operating relay connected
with said second source and energized by same and hav
closing of relay contact 43 by its coil 41.
ing a two-position operating contact, said operating relay
so constructed that the operating contact assumes a ?rc
The time interval between the start of decay in the
position until the voltage impressed on said operating
capacitor and the opening of relay contact 35 is con
trolled by means of the variable resistance 42. As will ll) relay drops below a preselected value, at which time said
be evident, the lower the resistance in resistance 42 the
more rapidly the voltage supplied by the capacitor will be
operating contact automatically shifts to its second posi
tion, circuit means governed by said operating contact
and constructed to connect said capacitor with said sec
To increase the time interval between start of
ond source when said operating contact is in said ?rst
decay and the opening of the contact 35 it is necessary
only to increase the resistance in the variable resistance. 45 position and with said control relay when said operating
contact is in said second position, said preselected voltage
In practice a range of time delay of from ?fteen seconds
value being high enough that the voltage from the capaci<
to three minutes has proved satisfactory. The setting
tor is su?'icient to energize said control relay to the extent
of a proper time delay will depend largely on the char
necessary to cause closing of its associated contact, and
acteristics of the pump, the load imposed thereon and the
length of time required for the motor to achieve a
known resistance means connected in parallel with the
quiescent condition.
capacitor whereby to obtain a positively controlled rate of
After the preset time interval has passed, as explained
above, contact 35 moves to the solid line position and the
discharge of the capacitor is directed to the control relay
coil 41 causing its contact 43 to close. if the power
interruption has been only momentary (less than the time
decay in said capacitor.
2. The arrangement as in claim 1 wherein said resist
ance means comprises a variable resistance operahle to
provide for varying the rate of decay of the capacitor
thus to change the time interval between failure of power
at the second source and the shifting of the operating con
delay for which the unit has been set) the closing of
tact from its ?rst to its second position.
contact 43 again energizes starter solenoid 21. This in
turn causes closing of the solenoid switches 13, 14, 15
References Cited in the ?le of this patent
and 30 with the result that power is again supplied from 60
the supply lines to the motor. The winding of trans
former T is at the same time energized, with the result
that contact 35 is returned to its capacitor charging posi
tion represented by the broken lines. Contact 43 will, of
course, open again and the entire system is reset for oper 65
ation as previously described.
The provision of the variable time delay makes it pos
sible, when a number of pumps are on the same supply
line, to stagger the restarting times for the individual
pumps, thus to prevent the application of too great a load
at one time on the line.
Once the motor is started the only way it can be
Anderson ____________ __ Nov. 3, 1936
Frese _______________ __ Jan. 19, 1937
Dyer ________________ __ Apr. 28,
Reagan ______________ __ Feb. 29,
Vrooman ____________ __ Sept. 20,
Myles _______________ __ Oct. 18,
Sheets ________________ __ Dec. 9,
The Electric Journal, vol. 34, No. 5, May 1937, “Ca
pacity-Stored Energy for Circuit-Breaker Tripping,” pages
193, 194.
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