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Патент USA US3060367

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'
Oct. 23, 1962
3’060,357
H. LOHEST
FILAMENT WINDING APPARATUS
Filed July 26I 1956
2 sheets._sheet 1
HANS LOHEsT
7
BY.-_.
W,WW
‘MvQQ/r
'
ATT'YS
Oct. 23, 1962
H. LOHEST
3,060,357
FILAMENT WINDING APPARATUS
Filed July 26, 1956
FIGS
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2 Sheets-Sheet 2
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FIG-6
HA NS LOH EST
BYL.
ATT'YS
Unite
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3,060,357
rates
Patented Oct. 23, 1962
2
1
?rst difference being preferably of the order of ninety
3,060,357
FILAMENT WliNDING APPATUS
Hans Lohest, Remscheid-Lennep, Germany, assignor to
Banner Maschinenfahrik Aktiengeselischaft, Wupper
degrees.
_
Another important object is to control the delivery of
tal-Uherharmen, Germany
electrical energy through a principal transformer _by
connecting the primary winding thereof with a ?uctuating
Filed .luly 26, 1956, Ser. No. 6%,331
Qlaims priority, application Germany July 30, 1955
power source and by interconnecting the secondary wind
ing of the transformer with that of a control transformer,
8 Claims. (Cl. 318-6)
the primary winding of which control transformer is
energized from a power source, the phase of which is
The present invention relates, in general, to the wind
ing and reeling of ?exible material, and has more partic 10 relatively displaced with respect to the energizing source
of the principal transformer; a further object being to
ular reference to the winding of thread and like ?la
control the delivery of energy in the primary winding of
mentary material upon spools, bobbins and similar ?la
the control transformer by means of an electronic switch
ment receivers, the invention pertaining speci?cally to the
ing device; a further object being to control the switching
provision of improved winding mechanism having means
for regulating the rate of turning movement of the wind 15 device in accordance with tension conditions prevailing
in a ?lament as the same is windingly applied upon a
ing reel in such fashion that, despite changes in the diam
eter of material as wound on the spool, the winding speed
of the spool at all times corresponds with the rate of
delivery of ?lamentary material thereto, wherey said ?la
spool or bobbin.
Since substantially all of the electrical energy required
for actuating the spool driving motor is supplied through
mentary material is ‘wound upon the spool under sub 20 the principal transformer operating at its adjusted basic
potential, the energy necessarily supplied through the con
stantially constant tension.
trol transformer is relatively small. The amount of en
In winding devices of the character mentioned, it is
ergy required to be delivered through the adjusting trans~
conventional to provide a control device which reacts to
former is relatively small, since only sufficient energy 1s
the changing size of the spool as ?lamentary material is
wound thereon, or which reacts to the tension under 25 needed to adjust motor speed above and below a nor~
which ?lamentary material is applied to the spool, and
to employ the control device as a means for regulating
the winding speed of the spool.
Such devices do not
mal operating spseed intermediate the maximum and
minimum speeds at which the motor is required to
operate.
Another important object of the present invention is
react instantly, but have an inherent lag which can not be
tolerated at high winding speeds which are now increas 30 to employ thyratron valves and appropriate valve actuat
ing system for switching purposes. In this connection a
ingly demanded in modern winding apparatus. Con
ventional speed regulating devices commonly apply un
desirable tension upon the thread and thereby tend to
cause thread breakage, especially where thin, light-weight
?laments are involved.
Arrangements wherein the control devices are caused
to react to the tension of the material being wound rather
than to the winding diameter of the spool have the ad
vantage of greater precision and also provide for ad
pair of thyratrons connected in relatively parallel and
reversed relation may be employed, whereby as a result
of the inertia of the driving motor, a practically constant
35 regulation is achieved.
It is, however, also possible, by
a special cooperating of the thread tension sensing pick
up with a variable inductance or a variable condenser to
control the thyratron valves in a manner to accomplish
alteration of the potential delivered through the con
justing the device to possible variations of tension in the
material being wound. On the other hand, tension varia
tions are often so weak, especially with thin ?laments,
trol transformer in exact accordance ‘with the changes
shortcomings and disadvantages.
trons.
in tension in the ?lament. In the arrangement embody
ing thyrtarons in parallel and reversed relation, the con
trol system may operate to permit thyratron ignition at
that the variations in ?lament tension have to be trans
mitted to the control device in ampli?ed form, thereby 45 ever constant instantaneous values of the ?uctuating po
tential of the power source, whereby motor regulation
requiring electrical translation equipment for amplifying‘
may be accomplished by way of the control transformer
purposes. Control mechanisms of the sort heretofore
during alternating periods of ignition and non-ignition
known, which operate to switch on and off the spool
of the thyratrons. Where a variable inductance or
driving motor, can not be used in high speed winding
operations because of the violent disruptive sparking 50 capacitance is employed in the control system, the mo
ment of ignition of the thyratrons may be delayed in re
which develops at the make and break contacts of the
sponse to the operation of the tension sensing device so
associated switches.
that the thyratrons operate to admit energy from the
An important object of the present invention is to pro
power main in fashion to accomplish regulation of the
vide improved control means for regulating the speed of
a ?lament winding spool while avoiding the above noted 55 motor in response to the delayed ignition of the thyra
The foregoing and numerous other objects, advan
tages and inherent functions of the invention will be
winding mechanism of the character mentioned by means
come apparent as the same is more fully understood
of a driving motor energized at variable voltage, the
potential of which ?uctuates above and below the ad 60 from the following description which, taken in connec
tion with the accompanying drawings, discloses a pre
justable base potential of a principal power supply trans
ferred embodiment of the invention.
former through which operating energy is supplied to the
Referring to the drawings:
.
driving motor; a further object being to provide means
FIG. 1 is a perspective view of ?lament winding ap~
for increasing or decreasing the basic potential of energy
supplied to the motor in accordance with variations in 65 paratus embodying the present invention;
FIG. 2 is a diagrammatic view of a portion of the
the tension of a ?lament being wound upon a spool driven
by the motor.
apparatus shown in FIG. 1;
FIG. 3 is an electrical wiring diagram of a motor con
Another important object is to utilize a control trans
trol system embodying the invention;
former for controlling the potential of electrical energy
supplied through a principal transformer; a further object 70 FIGS. 4, 5 and 6 are wiring diagrams of electrical
being to interconnect the transformers with a relative
connections showing modi?ed control systems embody
phase difference, the one with respect to the other, the
ing the invention; and
Another important object is to provide for controlling
3,060,357
3
FIG. 7 shows a modi?cation of the diagram illustrated
in FIG. 5.
To illustrate the invention, the drawings show wind
ing apparatus comprising ‘a winding spindle 11 adapted
to support and drivingly turn a Winding receiver R, such
as a tube, mandrel, spool, reel or bobbin, thereon. Con
ventional bearing means of any suitable or preferred
character may be employed for supporting the shaft for
line L, the primary winding 24 being connected with the
power supply line through switching means C controlled
by the sensing device S. In multiple arrangements, in
which a plurality of coil winding machines are disposed
in side-by-side or adjacent relationship, the principal trans
former 21 can be interconnected with the driving motors
of each machine in order to supply them with power at the
same basic potential.
turning movement, ‘as on a support frame or base 12.
The switching means C operates under the control of
The base may also support an electrical motor 13 driv 10 the sensing device S in order to control the supply of
ingly connected with the spindle 11 and operable to turn
energy to the motor energizing system 18 through the
the receiver R at desired speed for winding a ?lament of
auxiliary or control transformer 22 in order to adjust the
the receiver. In accordance with the present invention,
electrical energy in the supply circuit 18 at all times to
?lamentary material, such as a thread, may be delivered
that required to obtain the desired winding speed of the
from a supply source, such as a storage reel (not shown),
motor 13. in accordance with the present invention, the
or directly from a spinning machine, through a thread
switching means C functions to accomplish both the
guide G for winding upon the receiver R as the same is
choking of the basic potential down to a minimum op
turned on ‘and by the spindle 1,1 driven by the motor 12.
erating value, as well as increasing potential in the motor
The guide G may be of ‘any suitable or preferred char
energizing circuit up to maximum desired value. It will
acter actuated by a conventional transfer device T driven 20 be seen from the foregoing that the principal transformer
by a motor M in order to cause the thread guide G to
may be set to deliver power at a predetermined basic po
travel back and forth longitudinally of the receiver R at
desired speed. The spindle and receiver driving motors
are preferably caused to operate in synchronism; ‘and, of
tential in the supply circuit 18 while the control trans—
former 22 may function to regulate the intensity, or dura
tion, or number of successive power impulses required to
course, the guide actuating device T, if desired, might
be drivingly connected directly with the receiver driv~
ing motor 13. By using a separate motor M, however,
be added or subtracted in order at all times to drive the
motor 12 at desired speed; and it will be obvious that the
the receiver driving motor 13 is not burdened with a
guide driving load, and hence is entirely available for
the task of driving the winding receiver. As a conse
quence, it can be of a relatively low power rating, and
hence more sensitive to regulation in accordance with the
teachings of the present invention.
The ?lament is preferably delivered upon the winding
foregoing is accomplished by virtue of the fact that energy
supplied through the control transformer 22 is displaced
as to phase with respect to that supplied through the
principal transformer 21.
As shown more particularly in FIG. 4 of the drawings,
the control system C may comprise a pair of thyratron
valves 25 interconnected in relatively reversed, parallel
relationship in series with the primary winding 24 of the
receiver at as nearly constant a rate of delivery speed
transformer 22 between the conductors X and Y of a
as possible, the ?lament being delivered to the receiver
past a sensing device S which may conveniently comprise
three-phase power supply line L, the primary winding of
the principal transformer 21 being connected between
an axially movable stem 14‘ carrying a grooved ?lament
the line conductor W and the grounded or neutral conduc
tor Z. The control grids and cathodes of the thyratron
engaging head 15 and a spring 16 arranged to yieldingly
urge the stem 14 in a direction to press the head 15 4,0 valves 25 may be connected with suitable sources of uni~
laterally ‘against the ?lament as it passes to the receiver.
directional electrical energy for the purpose of actuating
The thrust of the spring may be adjusted to correspond
the valves, and a switch 26 may be provided for inter
with the ?lament tension under which it is desired to ac
connecting the control grids of the valves in order to
complish the winding operation.
As the diameter of
render the same electrically conductive, such switch being
the wound ?lamentary material increases on the re
controllably connected with the stem 14- so that said
ceiver R during a winding operation, it will be seen that
the direction of the thread changes as it passes from the
head of the sensing device S toward the receiver, the de
?ection angle A progressively increasing toward a maxi
mum value, as clearly shown in FIG. 2 of the drawings. 50
switch is normally urged toward closed position by action
of the spring 16 and will become open when tension in
the ?lament P exceeds a selected value. So long as the
switch 26 remains open the control transformer 22 will
remain inactive, functioning merely as a choke in the
circuit 18. Accordingly, reduced electric potential is Sup
plied to the motor 13, which, consequently, operates with
sensing device progressively increases as the receiver be
considerable slippage until ?lament tension is relaxed,
comes ?lled; and, even when the thread is under relatively
thereby allowing the spring 16 to close the switch 26.
slight tension, its force component upon the sensing de
vice is su?icient to activate the same.
55 Upon activation of the thyratrons, power delivered
through the control transformer is applied to modify or
The driving motor 13 may conveniently comprise an
modulate that supplied in the circuit 18 through the prin
alternating current, short-circuit rotor-type motor with
eipal transformer 21 in order to regulate the speed of the
increased rotor resistance, or a Ferrari slip-bushing motor
may be employed. In accordance with the teachings of
motor 13 in desired fashion. Accordingly, when the
the present invention, the motor 13‘ is electrically con 60 spring 16 causes the switch 26 to close, thereby igniting
As a consequence, the pressure of the thread upon the
nected in a power supply system 17 including means
adapted to supply electrical power in the motor energizing
circuit 18 at a value which ‘lies between the maximum and
minimum power requirements of the motor, and means
operable to increase and ‘decrease the power delivered
to the motor in accordance with the action of the sensing
device under the in?uence of variant tension conditions
in the ?lament as it is delivered for winding upon the
receiver R. To these ends, the circuit 18‘ may include
the secondary windings 19 and 26! of transformers 21 and 70
22, said secondary windings being interconnected in
series relationship with the power receiving windings of
the motor 13. The transformers 21 and 22, respectively,
the thyratrons, the motor runs faster than when the
switch is open. The sensitivity of the system is so good,
even at high delivery speeds, that variation in thread ten
sion is very limited. Because of the character of the
control transformer, a relatively high potential can be
employed in its primary circuit, whereby the current de
livered through the thyratron valves may be of relatively
low value so that the regulating impulse ampli?er may
have a low power rating.
It will be seen that the control system comprises auxili
ary transformer means H, which may be energized from
any suitable or convenient source, the primary winding
of said auxiliary transformer means being not shown.
If desired, the transformer means may comprise a pair
embody primary windings 23 and 24 energized from unlike
phases of a multiphase alternating current power supply 75 of separate transformers, or a single transformer having
3,060,357
6
5
of which is connected with a center tab on the winding
separate secondary windings 27 and 27 ' may be employed.
The transformer means H may also be employed, by
41, the positive side of the resistor 43 being connected
with the cathodes of the auxiliary thyratrons through
means of secondary windings (not shown), for heating
the cathodes of the thyratrons 25. The ?uctuating en
ergy produced in the windings 27 and 27’ may be de
livered through recti?ers R and R’ and stabilized by
the condensers C—1 and C—1’ as uni-directional elec
an adjustable resistor 44. The cathodes of the thyratrons
‘39 and 40 may also be electrically interconnected with
the line conductor X.
trical energy, which may be applied through voltage de
termining resistors R—1, R-2, R-3, R-4, and R-l’, R-2',
R-3’ and R—4', to the grids of the thyratrons 25. Con
40 may be altered as the result of the adjustment of the
condenser 26C under the in?uence of the sensing device S.
This can be accomplished by means of an electron valve
415, the anode of which may be connected to the positive
side of a suitable source 46 of unidirectional power. The
The potential upon the grids of the thyratrons 39 and
densers C—2 and C—2’ serve for the storage of the po
tential delivered on the grids of the thyratrons, said con
densers C—2 and C—2’ being provided mainly to sup
press any waviness that may be present in the negative
cathode of the tube may be connected, preferably through
an adjustable resistance 47, and thence through the re
uni-directional potential applied upon the grids of the 15 sistor 44 to the negative side of the power source 46.
The valve 45 may be controlled by interconnecting a
thyratrons, which are thus normally extinguished and in
bridge 48 comprising four condensers between the oath
non-conductive condition when the switch 26 is open.
ode and control grid of the valve 45. The condenser
Upon closure of the switch 26 the resistors R~2, R-3,
bridge 48 may be energized from a suitable source 49' of
and R-2' and R-3' form voltage dividers, the grids of
both thyratrons being connected through the grid re 20 high frequency energy in order to keep the capacitance
and thereby the size of the bridge condensers as small as
sistances R-4 and R-4' at the center of such voltage
possible. One of the condensers of the bridge may com
divider. If it be assumed that the phase potential be
prise the condenser 26C which is connected with the
positive with respect to the conductor Y of the three
sensing device S. Another of the condensers may be
phase supply cable L, then current will flow from phase
conductor X through the primary winding 24 of the 25 made adjustable.
When the bridge is adjusted to a desired setting, any
transformer 22, thence through the resistors R—2 and
unbalance thereof by action of the sensing device S on
R-3, the closed switch 26, and thence through the re
sistors R-2' and R-J3' to phase conductor Y of the cable,
the condenser 26C will control the valve 45 to corre
because the grids of the thyratrons thus become elec
spondingly change the potential applied across the resistor
trically positive, thereby igniting the thyratron V-2, in
30 44. The resistance 43 should be so large that the super
imposed auxiliary alternating potentials from the phase
so far as and so long as the cable conductor X is posi
tive with respect to the conductor Y.
brige extinguish the auxiliary thyratrons 39 and 40 when
During the negative half wave of energy in the con
ever the sensing device is activated. In response to the
ductors X and Y, thyratron V-1 ignites in the same man
operation of the sensing device, the effect of the auxiliary
ner because its anode is then positive with respect to its 35 grid potential supplied across the resistor 43 is suppressed
cathode. During the negative half wave current flows
as the result of the application of an opposing potential
from the phase conductor Y through the resistors R-2’
across the resistor 44 by action of the valve 45 under the
and R-3’, through the switch 26, and thence through the
control of the condenser 26C. The sum of the potentials
resistors R-2 and R-3 to the primary winding of the
applied at the resistors 43 and 44 shifts the ignition level
transformer 22, and thence back to phase conductor X. 40 of the thyratrons 39 and 4t}, and hence shifts the ignition
During the interval while the grids of the thyratrons are
level of the main thyratron valves 25. As a consequence,
positive for the initiation of the ignition, the negative
greater or lesser energy is supplied through the primary
grid potential at condensers C—1 and C—1' is rendered
winding of the control transformer 22.
ineffective by the high ohmic resistance of the resistors
vInstead of the electron tube 45 in conjunction with a
R-4 and R-4’. Upon the opening of the switch 26, how 45 condenser bridge, the potential applied across the resistor
ever, such negative grid potential immediately becomes
44 may be supplied under the control of a photoelectric
effective for the extinguishment of the thyratrons.
cell or a photosensitive semi-conductor element connected
across the resistor 44 in series with the power source 46.
As shown in FIG. 5, the system C may be arranged to
control operation of the thyratron valves 25 by means of
a variable condenser 26C which may be drivingly con
50
The photoelectric cell or photosensitive semi-conductor
unit, as shown in FIG. 7, may be employed in conjunction
nected with the sensing device S. In such case, the
with a small projection lamp as a light source, which
thyratrons 25 may be interconnected between a pair of
may be shielded as by means of a shutter drivingly con
line conductors, such as the conductors X and Y of the
nected with the sensing device S in order to adjust the
power supply line L, the primary winding 24 of the con
energy supplied from the power source 46 across the re
trol transformer being interconnected in series between 55 sistor 44. Numerous other known devices of conven
one of the line conductors and the thyratrons. The two
tional character may, of course, be employed for con
thyratron valves are alternately ignited by means of ?uc
trolling the electrical energy applied across the resistor 44
tuating potential applied in the grid circuits of the valves,
in response to ?lament tension changes detected by the
such potential being provided by the secondary windings
sensing device S.
31 and 32 of impulse transformers 33 and 34. The phase 60
As shown in FIG. '6 of the drawings, the thyratron
position of the alternating potential supplied to the grids
valves ‘25 may be interconnected between a pair of line
of the thyratron valves may be displaced, say ninety
conductors, such as the conductors X and Y of the power
degrees with respect to the potential applied on the
supply line L, the primary ‘winding 24 of the control
anodes of the valves, as by means of a phase displacing
bridge interconnected with the primary windings '35 and 65 transformer being connected in series between one of
the line conductors and the thyratrons. The two thyratron
36 of the impulse transformers, said bridge comprising a
transformer 37 having a winding 38 connected on one
valves are ignited alternately under the control of a vari
trically connected through a resistance condenser net
work 42 with the control grids of the valves 39 and 40.
ings '51 and 52 of a transformer 53 having a primary
able reactance 26R which may be drivingly connected
side with the primary windings 35 and 36, the opposite
with the sensing device S. The valves 25 are thus ignited
side of the winding ‘38 being connected with the wind
ings 35 and 36 through auxiliary thyratrons 39 and 40‘. 70 by ?uctuating potential applied in the grid circuits of the
valves, such potentials being provided by secondary wind
Another winding 41_ of the transformer 37 may be elec
winding 54. The phase position of the fluctuating po
tential thus applied to the grids of the valves 25 may be
and 40 is applied across a resistor 43, the negative side 75 displaced with respect to the potential applied on the
A grid biasing potential for the auxiliary thyratrons 39
3,060,357
7
anodes of the valves, as by means of a phase displacing
bridge interconnected with the primary winding of the
transformer 53, said bridge comprising a choke coil 55,
the opposite sides of which are connected respectively with
the line conductors X and Y.
8
reactive to tension variations in the ?lament being ap
plied on the receiver, whereby to control ?lament wind
ing speed in accordance with prevailing tension condi
tions in the ?lament.
adjustable resistor 56 with one side of the transformer
3. A speed regulating system as set forth in claim 1
wherein the selectively operable means for controlling the
auxiliary transformer means comprises an electronic
primary 54, the other side of said primary being connected
switching system interconnected with the primary winding
One end of the coil 55 may be connected through an
with the coil 55 at a medial tap. The opposite end of
of said auxiliary transformer means.
the coil ‘55 may be connected with one side of the adjust 10
4. A speed regulating system as set forth in claim 1
able reactance 26R, the opposite side of said reactance
wherein the selectively operable means for controlling the
being connected with the interconnected ends of the trans
auxiliary transformer means comprises an electronic
former primary 54 and the resistor 56. The phase angle
of ignition of the valves 25 may be adjusted by means of
switching system interconnected with the primary winding
of said auxiliary transformer means, said electronic
the reactance coil within a range of nearly one hundred 15 switching system embodying a pair of thyratron valves in
eighty degrees. Furthermore, the regulation of the ?uctu
ating current ?owing in the system is possible from a maxi
relatively reversed, parallel relationship, and a switcl
operable selectively to disable said thyratron valves and
mum value substantially all the way to a zero value.
to condition the same for operation.
The above described switching arrangements may, of
5. A speed regulating system as set forth in claim 1
course, be employed with direct current motors by intro 20 wherein the selectively operable means for controlling the
ducing suitable converter means in the motor energizing
auxiliary transformer means comprises an electronic
circuit 18.
switching system interconnected with the primary wind
Since the energy requirements of the motor 13 are
ing of said auxiliary transformer means, said electronic
largely met by power delivered through the principal
switching system embodying a pair of thyratron valves
transformer 21 operating at substantially constant poten 25 in relatively reversed, parallel relationship, and a variable
tial, the Work load through the control transformer 22 is
inductance interconnected with said thyratron valves for
relatively small. The range of regulation may be so ar
controlling the operation thereof.
ranged that the energy required at any time to reach either
maximum and minimum rated capacity of the motor is of
'6. A speed regulating system as set forth in claim 1
wherein the selectively operable means for controlling
about the same magnitude. Energy required to adjust 30 the auxiliary transformer means comprises an electronic
motor speed that must be provided by the regulating sys
switching system interconnected with the primary winding
tem is thus considerably smaller than is the case with
of said auxiliary transformer means, said electronic
conventional regulating mechanisms in which the basic
switching system embodying a pair of thyratron valves
potential corresponds either with the maximum or with
in relatively reversed, parallel relationship, and a variable
minimum motor operating potential.
An important advantage of the present invention thus
capacitance interconnected with said thyratron valves
for controlling the operation thereof.
resides in the fact that the regulating devices may be made
7. A speed regulating system for an induction motor
smaller and much more sensitive. Since only weak im
comprising a circuit for delivering energizing power to
pulses are available from the ?lament for controlling the
the motor, main power supply means connected in said
regulation of the motor, every reduction in size of the 40 circuit for delivering therein essential electrical motor
regulating mechanism is of importance in the interest of
driving energy ?uctuating at selected frequency, and aux
long life and economic operation of the mechanism. Fur
i‘liary power supply means connected in said circuit, in
thermore, the driving motor may be made to operate at
series with said main power supply means, for applying
relatively higher than usual e?lciency because a greater
in said circuit supplemental motor driving energy ?uctuat
e?‘iciency is derived by supplying motor operating power
ing at like frequency and displaced substantially 90° as
through the principal transformer without very much en
to phase with respect to said essential motor driving en
ergy, to thereby apply on the motor resultant motor
driving energy that is out of phase with respect to said
essential motor driving energy.
8. A speed regulating system for an induction motor
comprising a circuit for delivering energizing power to
the motor, a principal transformer connected in said cir
ergy being expended upon control through the phase
shifted control transformer.
'It is thought that the invention and its numerous at
tendant advantages will be fully understood from the fore~
going description, and it is obvious that numerous changes
may be made in the form, construction and arrangement
of the several parts without departing from the spirit or
cuit for delivering therein essential electrical motor driv
scope of the invention, or sacri?cing any of its attendant . ing energy ?uctuating at selected frequency, and auxiliary
advantages, the forms herein disclosed being preferred em 55 transformer means connected in said circuit, in series with
bodiments for the purpose of illustrating the invention.
said principal transformer, for applying in said circuit
supplemental motor driving energy ?uctuating at like fre
The invention is hereby claimed as follows:
quency and displaced substantially 90° as to phase with
1. A speed regulating system for an electric motor
respect to said essential motor driving energy, to thereby
comprising a circuit for delivering energizing power to the
motor, a principal transformer connected in said circuit 60 apply on the motor resultant motor driving energy that
is out of phase with respect to said essential motor driv~
for applying therein essential electrical motor driving
ing energy.
energy ?uctuating at selected frequency, auxiliary trans
former means connected in said circuit for applying there
References Cited in the file of this patent
in, in addition to said essential motor driving energy
supplied through the principal transformer, supplemental 65
UNITED STATES PATENTS
motor driving energy of ?uctuating character and selected
728,970
Peck ________________ _._ May 26, 1903
frequency, and selectively operable means connected with
said auxiliary transformer means to control the same to
operate selectively as a choke in said circuit and as a
70
source of supplemental energy.
2. A speed regulating system as set forth in claim 1
wherein the regulated motor is drivingly connected with
a ?lament winding receiver, and said selectively oper
able means is controllingly connected with sensing means 75
1,828,583
Weiske et a1 ___________ __ Oct. 20, 1931
2,271,051
2,296,959‘
Treckmann et al ________ __ I an. 27, 1942
Swanson _____________ __ Sept. 29, 1942
2,554,956
2,571,023
2,571,454
Reeves _______________ __ May 29, 1951
Ertner _________________ __ Oct. 9, 1951
Jones et al. ____________ __ ‘Oct. 16, 1951
2,597,136
2,725,508
Synder _______________ __ May 20, 1952
Bailey et al ___________ _.. Nov. 29, 1955
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