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Патент USA US2405053

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July 39, 1946.
E_ J_ PQSSELT
'2,405,053
CONTROLLER FOR ELECTRIC MOTOR DRIVEN TRAVELING MACHINES
Filed March 18, 1944
Tor?!
Patented July 30, 1946
2,405,053
UNITED STATES PATENT OFFICE
2,405,053
CONTROLLER FOR ELECTRIC IVIOTOR
DRIVEN TRAVELING MACHINES
Edward J. Posselt, Fox Point, Wis., assignor to
Cutler-Hammer, Inc., Milwaukee, Wis., a cor
poration of Delaware
Application March 18, 1944, Serial No. 527,058 ~
4 Claims.
1
This invention relates to controllers for elec
tric motor driven traveling machines using trol
leys.
(Cl. 172-179)
'
2
The windings 4 and 4a of switches F and B,
respectively, are controlled by relays PR and RR,
respectively. The relay FR has normally disen
The invention while not limited thereto is par
ticularly advantageous for controllers for coal and
ore bridges having alternating current control,
the invention having among its objects reduction
to a minimum of the trolley wires from the pilot
device to the control panel, this in the case of
coal and ore bridges and other traveling mech
anisms being frequently highly important.
gaged contacts 0 connected between the winding
4 and line L1 and said relay has a winding d
which when energized engages said contacts. The
relay RR has similar contacts 01 and a wind
ing ($1, the contacts c1 being included in circuit
between winding 4a and line L1.
The switches and relays thus far described com
prise elements of the stationary control panel for
the traveling mechanism, the relays PR. and RR
being under the control of pilot contacts to be
Another object of the invention is to provide
a control system having the aforementioned ad
vantageous characteristic and also that of en
carried by the traveling mechanism. The pilot
abling use in conjunction with the electrical over 15 contacts may comprise contacts of a control drum
load devices auxiliary control windings, as for
D and are so illustrated, although it is to be
holding them in tripped position, Without any
understood that they may assume any desired
complication of connections.
form. While in practice the drum D would or
Other objects and advantages will hereinafter
dinarily comprise contacts in addition to the con
appear.
tacts required to control relays FR and RR. only
The accompanying drawing illustrates diagram
the latter contactsyare shown in the drawing.
matically in simpli?ed form one embodiment of
the invention which will now be described, it
These contacts comprise normally disengaged con
tacts 5 and ‘6 which are engaged when the drum
being understood that the embodiment illustrated
is moved in reversing direction as to the position
is susceptible of various modi?cations without
departing from the scope of the appended claims.
Referring to the drawing, the same shows an
alternating current motor M of suitable type sup
X and similar contacts 1 and 8 which are engaged
when the drum is moved in forward direction as
to position X1. X and X1 may be considered as
cams to engage their respective sets of contacts.
plied from alternating current lines L1, L2 and
L3 through selectively operable reversing switches
moved to 01f position. The contacts 5 and 1 re
F and R.
The reversing connections are of con
ventional form, the switches F and R each being
of the triple pole electromagnetic type. Also as
is quite customary the motor has associated there
with overload devices IOL, ZQL having tripped
windings a and a1, respectively, included in se
ries with the motor upon connection thereof to
the line through either of the reversing switches.
The switch F has three pairs of stationary con
tacts and three bridging contacts I, 2 and 3, nor
many disengaged from their respective stationary
contacts, and being operable jointly by an elec
tromagnetic winding 4 to engage their respec
tive stationary contacts. The switch R has simi~
lar sets of contacts including bridging contacts
18, 2a and 3a and a similar operating winding 12a.
releasing them to disengage when the drum is
spectively have trolley connections T and T1 to
lines L3 and L1, respectively. Contacts 6 and 8
are interconnected and have a trolley connection
T2 to a conductor 9 which interconnects opposed
recti?ers l0 and H.
The recti?ers IE3 and H are respectively con
nected to the windings cl and d1 and through said
windings to lines L3 and L1, respectively. How
ever, even though the windings cZ and d1 have
permanent connections with lines L3 and L1 re
spectively, current ?ow therethrough in series is
blocked by the opposed rectifiers l0 and II.
As shown the connection between conductor 9
and the pilot contacts includes windings e and e1
for the overload relays l?L and 20L, respectively,
the purpose of which windings will be later set
The windings 4 and 4a are adapted to be con
forth.
nected selectively across lines L1 and L3 by relays
As will now be apparent, although windings
to be described. and the energizing connections
d and d1 have a common connection to the pilot
of said windings have included therein in series 50 contacts, the pilot contacts and the recti?ers Ill
normally engaged contacts b and b1 of the afore_
and I ! nevertheless jointly a?ord selective ener
mentioned overload switches [5L and 29L, re
gization of the normally deenergized relays FR
spectively. The contacts b and b1 are adapted
and DR. Thus when pilot contacts 1 and 8 are
to be disengaged by response of the overload wind
engaged current will flow only through the wind
ings a and a1 aforementioned.
ing cl, winding d1 and recti?er I I being short
2,405,053
3
circuited. The energizing circuit for winding (1
comprises its connection to line L3 and its con
nection to line L1 through recti?er Ill and con
tacts 8 and ‘I of the drum, the latter connection
extending from winding (2 to and through wind
ings e and e1 in series to trolley connection 'I‘2
and thence to and through contacts 8 and ‘I and
trolley connection T1 to line L1. On the other
hand, when contacts 5 and 6 are engaged only
winding all will be energized, the winding :1 and
recti?er In being short-circuited. The energizing
circuit of winding (11 comprises its connection to
4
said supply circuit and with said common supply
lead of said windings, and recti?ers in circuit with
said windings to render their energization de
pendent upon selective setting of said pilot con~
tacts.
2. In a controller for a motor driven traveling
machine, in combination, an alternating current
circuit, a reversing controller for the machine to
be mounted in a ?xed position and comprising
electr-oresponsive windings to be energized selec
tively for drive reversals, said windings being con
nected between different lines of said circuit and
a common supply lead, pilot contacts to travel
line L1 and its connection to line L3 through rec
with the traveling machine and having trolley
ti?er i i and drum contacts 6 and 5, the latter
connection extending from winding d1 to and 15 connections with said different supply lines re
spectively, an additional trolley connection be
through windings e and e1 to trolley connection
tween said pilot contacts and said common sup
T2 and thence to and through contacts 6 and 5
to trolley connection T, which as explained is
connected to line L3. Hence as will be apparent,
selective control of relays FR and RR is obtained
with a minimum number of trolley connections,
whereas the trolley connections T and T1 are
available for use in various other circuits com
monly desired in the control of coal and ore bridges
and other traveling mechanisms. Such being the
case, selective control for the windings d and d1
to afford reversals of the motor at will may be
said to involve only the addition of the single
trolley connection T2.
Considering now windings e and c1, the same
may be employed to hold their respective over
load switches against resetting after tripping
thereof by the windings in series with the motor.
ply lead of said windings, and recti?ers respec
tively in series with said windings and being op
positely disposed to block an effective current
?ow through said windings in series but enabling
energization of said windings selectively by said
pilot contacts.
3. In a controller for a motor driven traveling
machine, in combination, an alternating current
supply circuit, a reversing controller for the mo
tor to be mounted in ?xed position, said controller
comprising electroresponsive windings to be ener
gized selectively for motor reversals and compris
ing a motor protective device having operating
means and a holding winding, all of said windings
having certain common connections, pilot con
tacts to travel with the traveling machine and
having trolley connections with said supply cir
parent that if either overload switch is tripped it 35 cuit and with said common connections of said
windings, and recti?ers respectively in circuit
will be held in tripped position pending return of
with said ?rst mentioned windings to necessitate
the drum D to off position to interrupt the con
energization thereof selectively and to enable
nection of conductor 9 with line L3. When such
control of all of said windings by said pilot con
disconnection occurs both windings e and e1 are
deenergized to permit resetting of the overload 40 tacts through a single trolley connection with‘
selectivity of control of ‘the ?rst mentioned wind
switch or switches preparatory to further oper
ings.
ation of the motor. Such control of the overload
4. In a controller for a motor driven traveling
switches is often highly desirable, and as will be
machine, in combination, an alternating current
apparent it is obtainable in the system shown
supply circuit, a reversing controller for the mo
without any complications or need of additional
tor to be mounted in ?xed position, said controller
contacts.
,
comprising electroresponsive windings to be ener
On the other hand, it will be apparent that
gized selectively for motor reversals and compris
the system disclosed is in nowise dependent upon
ing a motor protective device having operating
the presence of the coils e and e1 and that if such
means
and a holding winding, pilot contacts to
coils are not desired a direct connection from the 50
travel with the traveling machine and having
trolley T2 to conductor 9 may be made which will
trolley connections with said supply circuit, a
afford the same selective control of the forward
trolley connection common to said pilot contacts,
and reverse relays as that aforedescribed.
said ?rst mentioned windings and said holding
What I claim as new and desire to secure by
winding, and recti?ers respectively in series with
Letters Patent is:
55 said ?rst mentioned windings to necessitate en
1. In a controller for a motor driven traveling
ergization thereof selectively and to enable their
machine, in combination, a supply circuit, a re
energization selectively by said pilot contacts
versing controller for the machine to be mounted
through said common trolley connection, said
in ?xed position and comprising electroresponsive
holding winding being traversed by and respon
windings to be energized selectively for drive re 60 sive to the current thus supplied to either of said
versals according to line connection of a single
?rst mentioned windings.
supply lead common to said windings, pilot con
tacts to travel with the traveling machine and
EDWARD J . POSSELT.
With windings e and e1 so utilized it will be ap
having trolley connections with di?erent lines of
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