US1327795A - System of control - Google Patents

System of control Download PDF

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US1327795A
US1327795A US175594A US17559417A US1327795A US 1327795 A US1327795 A US 1327795A US 175594 A US175594 A US 175594A US 17559417 A US17559417 A US 17559417A US 1327795 A US1327795 A US 1327795A
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circuit
conductor
main
slipping
excitation
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US175594A
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Charles C Whittaker
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CBS Corp
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Westinghouse Electric and Manufacturing Co
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/10Indicating wheel slip ; Correction of wheel slip
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00Type of vehicles
    • B60L2200/26Rail vehicles

Definitions

  • My invention relates to systems of control and especially to the automatic regu ⁇ lation thereof under conditions of slipping or skdding of the associated vehicle wheels in regenerative control systems for locomotives and the like.
  • lt is the object of my present invention to provide a relatively simple and effective means for precluding the possibility of an immediate recurrence of slipping or skidding conditions in the dynamo-electric machines of a locomotive or the like, whereby such abnormal conditions are remedied immediately upon their recurrence, and certain machine conditions are so changed that immediate recurrence of slipping or skidding is obviated.
  • FIG. 1 is a diagrammatic view of the main circuits of a control system embodying my present invention
  • Fig. 2 is a diagrammatic view of certain auxiliaryr circuits for governing the operation of the main machines that are shown in F ig. 1
  • Fig. 3 is a diagrammatic view of an electric locomotive unit embodying a plurality of dynamo-electric machines to which my invention may be applied.l
  • the structure shown comprises a locomotive cab 1 which. is suitably supported upon a plurality of articulated trucks 2 and 3 of suitable design and which respectively embody a. plurality of sets of driving wheels 4f and 5 that are adapted to run upon track rails 6, in accordance with the usual practice.
  • a plurality of dynamo-electric machines M1 and M2 are provided and may be associated with the wheels of the various trucks in any suitable manner, as by driving mechanisms 7 and 8 of a familiar type.
  • the system shown comprises supply-circuit conductors Trolley and Ground; the dynamo-electric machines M1 and M2, which are respectively provided with commutator-type armatures A1 and A2 and field windings F1 and F2 of the series type; a plurality of balancing resistors R1 and R2 that are associated with the respective machine windings in a manner to be set forth; an auxiliary exciting source for the main field windings, preferably comprising a motor-generator set 10; a variable resistor l1 that is connected in the main-lield-winding circuits and is adapted to be regulated by a controller 12 having an automatic actuating mechanism 13; a limit switch 14 for governing the operation of the mechanism 13, in accordance with circuit conditions; and a plurality of voltage-relay devices 15 and 16' that are connected across the respective main armatures A1 and A2 for an automatic governing purpose to be described.
  • the motor-generator set 10 is shown as comprising a driving or motor armature 2O that is mechanically associated, in any suitable manner, as by a shaft 2l, with a generator or exciting armature 22.
  • a main or exciting field winding .23 and a compensating )'ield winding 24 are provided for the driving armature 20, and similar field windings and 26 are associated with the generating armature 22.
  • the controller 12 comprises a movable contact segment 29 that is preferably mounted upon a drum 30 and is of suitable configuration for successively engaging a plurality of stationary control iingers 31 that are connected to various points of the fieldwinding-circuit resistor 11, whereby the active circuit value thereof may be varied.
  • the actuating mechanism 13 is of a fay .miliar electricallyfcontrolled, pneumatically operated type and comprises a pinion 32 mally closed valve 39 is likewise provided4 with an inlet pipe or passage l2, and any suitable source ci fluid pressure (not shown) may be connected to the pipes l-l and 42.
  • the actuating coils Gn and Gil are concurrently denergized, whereby fluidpressure conditions in the apparatus revertto the original unbalanced state, and the dcsired backward movement is eleeted.
  • the main circuits are established from the trolley through conductor 50 to junction-point 51, where the circuit divides, one branch including conductor 52, main armature A1, conductor 53 and balancing resistor R1 to a second junction-point 55, and the other branch traversing conductor 5G, main armature A2, conductor 57 and the balancing resistor R2 to the junction-point 55, whence a common circuit is completed neer/,795
  • the exciting circuit for the main field windings is established from the positive terminal of the auxiliary generating armature 22 through conductors 61, 62 and 58 to the junction-point 55, where the circuit divides, one branch traversing ⁇ the balancing resistor R1, main ield winding lll and conductor 63 to a junction-point 64e, and the other branch including the balancing resister R2 and main lield winding F2 to the junction-point 64, whence a. common circuit is continued through the variable auxiliary resistor 11, conductor 66 and compensating field winding 26 to the negative te 1minal oi the generating armature 22.
  • a further circuit is established from the trolley, through conductor 67, compensating field winding 2l, armature 20 and exciting eld 'winding 23 for the auxiliary driving motor, conductor 68, exciting field winding 25 for the auxiliary generating armature 22 and thence through conductor 62 to ground.
  • both oiC these currents traverse either one of the balancing resistors lll and R2 in the same direction.
  • the corresponding voltage drop across the resistor Bl immediately and inherently reduces the portion of the auxiliary generating-armature voltage that is available for delivery to the main field winding F1, or, in other words, the excitation is varied oppositely to the regenerated current traversing the main armature A1.
  • the excitation or" the main field windings may be increased by gradually shortcircuiting the variable resistor 11, and this result is accomplished automatically by the auxiliary system that is shown in Fig. 2,
  • a master controller MC having a plurality of operative positions a and Z) for primarily governing the system operation and an auxiliary source of energy, suoli as a battery B.
  • a circuit is established from the positive terminal of the battery B through conductor 69, control fingers and 71, which are bridged by contact segment 72 of the master controller, conductor 73, cooperating stationary and movable contact members 74 and 75 of the voltage relays 15 and 16, respectively, in their upper or high-voltage positions, conductors 76 and 77, the actuating coil On and conductor 7 9 to the negative terminal of the battery B.
  • the forward actuation of the controller 12 to gradually short-circuit the resistor 11 is automatically governed, in accordance with regenerated current conditions, by the limit switch 14, in conformity to a familiar practice, under normal operating conditions.
  • the lifting of the limit switch interrupts the circuit of the off coil and thus arrests the movement of the controller 12, as
  • 1 provide a control system, wherein slipping or skidding conditions of a dynamo-electric machine are immediately remedied, and no further alternate slipping and rail-gripping7 can possibly obtain until a considerable time interval has elapsed and speed conditions of the vehicle have materially. decreased.
  • this result may be accomplished by closing the switching device 45 (Fig. 2), whereby a circuit is completed from the conductor 7 8 through conductor 83, switching device 45 and conductor 84 to the conductor 77, or, in other words, the cooperating contact members 74 and. 75 of the voltage relay devices 16 and 15, respectively, are short-circuited and rendered ineffective.
  • el. ln a system of regenerative vehicle control, the combination with a plurality of momentum-driven dynamo-electric machines for operating the vehicle along track rails, of means for separately exciting said machines, means for regulating such excitation, and means dependent upon the slipping of any machine for actuating said regulating means to modify the machine excitation, whereby said slipping is remedied by causing the corresponding machine to grip the rails and successive slipping and railgripping is obviated.
  • a system of control the combination with a plurality of dynamo-electric machines severally having armatures and field windings, of means for separately exciting said field windings, a controller for regulating such excitation, an electrically-governed apparatus for operating said controller in either direction, and means dependent upon the slipping of any machine for energizing said electrically governed apparatus to modify the field excitation, whereby said slipping is remedied and immediate recurrence thereof is prevented.
  • l0. ln a system of control, the combination with a plurality of dynamo-electric machines severally having armatures and field windings, of means for separately exciting said field windings, a controller for regulating such excitation, an apparatus'having a plurality of actuating coils for operating said controller in either direction, and a plurality of relay devices connected across the respective armatures and severally provided with contact members that are connected in series-circuit relation with one of said coils only when the voltage dierence of each machine from normal is less than a predetermined value.
  • a system of control the combination with. a plurality of dynamo-electric machines severally having armatures and field windings, of means for separately exciting said field windings, a controller for regulating such excitation, an apparatus having a plurality of actuating coils for operating said controller in either direction, and a plurality of relay devices connected across the respective armatures and severally provided with contact members that are connected in series-circuit relation with one of said coils only when the voltage difference of each machine from normal is less than a predetermined valuc, and another relay device governed by the main-m achine current for opening and closing the circuit of the other coil.

Description

Unire spares rarnnr lernten.
,CHARLES C. WHITTFLKER, 0F "il/"ILKNSBURG, PENNSYLVANIA, ASSIGNOR TO WEST- INGHOUSE ELECTRIC t TfIANUFAGTRNG COId-PANY, A CORPDRATIC'N 0F PENN- SYLVANIA.
SYSTEM OF CONTRL.
Application iled June 19, 1917.
To all whom t may concern.'
Bc it known that l, CHARLES C, `WHIT- 'rAnnn, a citizen of the United States, and a resident of llilkinsburg, in thecounty of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Systems of Control, of which the following is a specilication.
My invention relates to systems of control and especially to the automatic regu` lation thereof under conditions of slipping or skdding of the associated vehicle wheels in regenerative control systems for locomotives and the like.
ln the prior art, various schemes have been proposed to eliminate slipping or skidding of dynamo-electric machines during periods of vehicle propulsion or retardation, such action, in general, being dependent upon the difference in voltage of the armatures of 'a normally operating and a slipping or skidding machine. However, so far as l am aware. no system has been devised for absolutely preventing an immediate recurrence ofsuch abnormal conditions after they have once been remedied, and, consequently, it has been possible in such prior art systems for vsuccessive slipping and rail-gripping to occur until such time as the vehicle speed has become materially reduced.v I
lt is the object of my present invention to provide a relatively simple and effective means for precluding the possibility of an immediate recurrence of slipping or skidding conditions in the dynamo-electric machines of a locomotive or the like, whereby such abnormal conditions are remedied immediately upon their recurrence, and certain machine conditions are so changed that immediate recurrence of slipping or skidding is obviated.
My invention is illustrated in the accompanying drawings, wherein Figure 1 is a diagrammatic view of the main circuits of a control system embodying my present invention; Fig. 2 is a diagrammatic view of certain auxiliaryr circuits for governing the operation of the main machines that are shown in F ig. 1; and Fig. 3 is a diagrammatic view of an electric locomotive unit embodying a plurality of dynamo-electric machines to which my invention may be applied.l
Referring first to Fig. 3 of the drawings,
Speccation of Letters Patent.
Patented Jan. 13, 1920.
serial No. 175,594.
the structure shown comprises a locomotive cab 1 which. is suitably supported upon a plurality of articulated trucks 2 and 3 of suitable design and which respectively embody a. plurality of sets of driving wheels 4f and 5 that are adapted to run upon track rails 6, in accordance with the usual practice. A plurality of dynamo-electric machines M1 and M2 are provided and may be associated with the wheels of the various trucks in any suitable manner, as by driving mechanisms 7 and 8 of a familiar type.
Referring now to F ig. 1, the system shown comprises supply-circuit conductors Trolley and Ground; the dynamo-electric machines M1 and M2, which are respectively provided with commutator-type armatures A1 and A2 and field windings F1 and F2 of the series type; a plurality of balancing resistors R1 and R2 that are associated with the respective machine windings in a manner to be set forth; an auxiliary exciting source for the main field windings, preferably comprising a motor-generator set 10; a variable resistor l1 that is connected in the main-lield-winding circuits and is adapted to be regulated by a controller 12 having an automatic actuating mechanism 13; a limit switch 14 for governing the operation of the mechanism 13, in accordance with circuit conditions; and a plurality of voltage-relay devices 15 and 16' that are connected across the respective main armatures A1 and A2 for an automatic governing purpose to be described.
The motor-generator set 10 is shown as comprising a driving or motor armature 2O that is mechanically associated, in any suitable manner, as by a shaft 2l, with a generator or exciting armature 22. A main or exciting field winding .23 and a compensating )'ield winding 24 are provided for the driving armature 20, and similar field windings and 26 are associated with the generating armature 22.
The controller 12 comprises a movable contact segment 29 that is preferably mounted upon a drum 30 and is of suitable configuration for successively engaging a plurality of stationary control iingers 31 that are connected to various points of the fieldwinding-circuit resistor 11, whereby the active circuit value thereof may be varied.
The actuating mechanism 13 is of a fay .miliar electricallyfcontrolled, pneumatically operated type and comprises a pinion 32 mally closed valve 39 is likewise provided4 with an inlet pipe or passage l2, and any suitable source ci fluid pressure (not shown) may be connected to the pipes l-l and 42.
The operation of the electrically-governed apparatus 13, without regard to the circuit connections effected thereby, ma f be `set Jr'orth as follows: Upon concurrent energizetion of the actuating coils 0n and Off, the initial unbalanced Huid-pressure conditions, whereby the n'iechanisin is biased to the illustrated position, are reversed, that is, luid pressure is admitted to the cylinder' 37 and is released trom the other cylinder 3S to effect a movement oi' the pistons 35 and 36 toward the right. To arrest such movement, at any time, it is merely necessary to deenergize the Dit coil, whereupon balanced high-pressure-iuid conditions immediately obtain in the apparatus, and a positive and reliable stoppage thereof is secured.
To produce a return movement of the controller, the actuating coils Gn and Gil are concurrently denergized, whereby fluidpressure conditions in the apparatus revertto the original unbalanced state, and the dcsired backward movement is eleeted.
Inasmuch as the particular circuit arrangements or inaugurating accelerating or regenerative operation or the illustrated system are immaterial to my present invention, which is capable of a wide variety of applications, l have not deemed it necessary to illustrate or describe such arrangements but have eliminated, in so far as possible, main-circuit switches and the like which, it is understood, will be normally employed during the operation of the system.
Assuming, therefore, that the system is operating under regenerative conditions, for example, the main circuits are established from the trolley through conductor 50 to junction-point 51, where the circuit divides, one branch including conductor 52, main armature A1, conductor 53 and balancing resistor R1 to a second junction-point 55, and the other branch traversing conductor 5G, main armature A2, conductor 57 and the balancing resistor R2 to the junction-point 55, whence a common circuit is completed neer/,795
'through conductor 58, the actuating coil for the limit switch i4. and conductor 59 to the negative supply-circuit conductor Ground.
The exciting circuit for the main field windings is established from the positive terminal of the auxiliary generating armature 22 through conductors 61, 62 and 58 to the junction-point 55, where the circuit divides, one branch traversing` the balancing resistor R1, main ield winding lll and conductor 63 to a junction-point 64e, and the other branch including the balancing resister R2 and main lield winding F2 to the junction-point 64, whence a. common circuit is continued through the variable auxiliary resistor 11, conductor 66 and compensating field winding 26 to the negative te 1minal oi the generating armature 22.
A further circuit is established from the trolley, through conductor 67, compensating field winding 2l, armature 20 and exciting eld 'winding 23 for the auxiliary driving motor, conductor 68, exciting field winding 25 for the auxiliary generating armature 22 and thence through conductor 62 to ground.
The illustrated maincircuit connections are not of my present invention, but are fully set forth and claimed in a co-pending` application of Rudolf E. Hellmund, Serial No. 44,443. filed August 9, 1915, and assigned to the Westinghouse Electric t lilianulfacturing Company. Consequently, only a brief description or' the operation thereorn will. be necessary to afford a thorough comprehension of the present invention.
As indicated by the solid arrows, representing main armature or regenerated current, and the dotted arrows, denoting exciting or main-field-winding current, both oiC these currents traverse either one of the balancing resistors lll and R2 in the same direction. Hence, upon an incipient increase of 'regenerated current in the main armature Al, for example, the corresponding voltage drop across the resistor Bl immediately and inherently reduces the portion of the auxiliary generating-armature voltage that is available for delivery to the main field winding F1, or, in other words, the excitation is varied oppositely to the regenerated current traversing the main armature A1. rlhe converse action occurs 'whenever an incipient decrease ot current obtains in the main armature. ln this way, a substantially constant regenerated current is maintained in the main arnfiature, irrespective of supply-circuit-voltage fluctuations and the like.
To compensate tor the gradual decrease oi? vehicle speed during the retardation period, the excitation or" the main field windings may be increased by gradually shortcircuiting the variable resistor 11, and this result is accomplished automatically by the auxiliary system that is shown in Fig. 2,
comprising the actuatingcoils On and Off for the controller-regulating mechanism 13, the auxiliary contact members of the relay devices 14, 15 and 16, an auxiliary switching device 45 for short-circuiting the .ontact members of the voltage relays 15 and 16 under predetermined conditions, a master controller MC having a plurality of operative positions a and Z) for primarily governing the system operation and an auxiliary source of energy, suoli as a battery B.
Upon actuation of the master controller to its initial operative position a, a circuit is established from the positive terminal of the battery B through conductor 69, control fingers and 71, which are bridged by contact segment 72 of the master controller, conductor 73, cooperating stationary and movable contact members 74 and 75 of the voltage relays 15 and 16, respectively, in their upper or high-voltage positions, conductors 76 and 77, the actuating coil On and conductor 7 9 to the negative terminal of the battery B.
If the master controller is moved to its position b, afurther circuit is completed from the contact segment 72 through control finger 80, conductor 81, cooperating stationary and movable contact members S2 of the limit switch 14, in its low-current position, and the actuating coil Off to the junction-point 78 and the negative conductor 79.
The forward actuation of the controller 12 to gradually short-circuit the resistor 11 is automatically governed, in accordance with regenerated current conditions, by the limit switch 14, in conformity to a familiar practice, under normal operating conditions. The lifting of the limit switch interrupts the circuit of the off coil and thus arrests the movement of the controller 12, as
previously explained.
However, in case either of the main armatures A1 and A2 and the sets of vehicle wheels 4 and 5 that are respectively associated therewith should slip or skid, the voltage of that armature is materially reduced, as is well understood, whereby the corresponding voltage relay 15 or 16 will drop to its open-circuit posit-ion to denergizo the on actuating coil. At the same time, the regenerated current will be sufficiently high to lift the limit switch 14 to interrupt the energizing circuit for the actuating coil Off. Consequently, since both actuating coils for the mechanism 13 are concurrently denergized, a backward movement of the controller 12, to reinsert a greater amount of the variable resistor 11 in the main-field-winding circuit and thereby weaken the main-machine excitation, takes place until voltage and speed conditions of the two main armatures are again equalized, whereupon normal operation of the system, as previously described, will be resumed and,
furthermore, `no immediate recurrence of such slipping or skidding conditions will obtain, by reason of the weakened mainfield-winding excitation. In this way, 1 provide a control system, wherein slipping or skidding conditions of a dynamo-electric machine are immediately remedied, and no further alternate slipping and rail-gripping7 can possibly obtain until a considerable time interval has elapsed and speed conditions of the vehicle have materially. decreased.
In lieu of varying the resistor 11 tol compensate for the gradual decrease of vehicle speed, other well-known methods, such as changing the active circuit value of the resistors R1 and R2, or of resistors that are connected in shunt to the exciting field winding 23, may be utilized.
If it is desired to exclude the voltage relays 15 and 16 from active circuit regulation during the accelerating period, this result may be accomplished by closing the switching device 45 (Fig. 2), whereby a circuit is completed from the conductor 7 8 through conductor 83, switching device 45 and conductor 84 to the conductor 77, or, in other words, the cooperating contact members 74 and. 75 of the voltage relay devices 16 and 15, respectively, are short-circuited and rendered ineffective.
1 do not wish to be restricted to the specific' circuit connections or arrangement of parts herein set forth, as various modifications thereof may be effected without departing from the spirit and scope of my invention. I desire, therefore, that only such limitations shall be imposed as are indicated in the appended claims.
T. claim as my invention:
1. 1n a system of control, the combination with av plurality of dynamo-electric masingle means for simultaneously regulating the operation thereof, means dependent upon a material departure in the speed of either machine from normal for actuating said single regulatir means to weaken the machine excitation, ufhereby further speed departures under the existing opera-ting conditions are prevented.
2. In a system of control, the combination with a `plin'fality of dynamo-electric machines associated with a common load, of single means for siinultaneously regulating the operation thereof, and means dependent upon the slipping of any machine for actuating said single regulating means to modify the mach ine excitation, whereby said slipping7 is remedied and further slipping under the existing general machine conditions is obviated.
3. In a .system of vehicle control, the combination with a plurality of dynamo-electric machines for operating the vehicle along `chinos associated with a common load, of
track rails, of single means for simultaneously regulating the operation of said machines, and means dependent upon the slipping of any machine for actuating said single regulating means to weaken the machine excitation, wherebysaid slipping is remedied by causing the corresponding machine to grip the rails and successive slipping and rail-gripping is obviated.
el. ln a system of regenerative vehicle control, the combination with a plurality of momentum-driven dynamo-electric machines for operating the vehicle along track rails, of means for separately exciting said machines, means for regulating such excitation, and means dependent upon the slipping of any machine for actuating said regulating means to modify the machine excitation, whereby said slipping is remedied by causing the corresponding machine to grip the rails and successive slipping and railgripping is obviated.
5. In a system of control, the combination with a plurality of dynamo-electric machines severally having armatures and field windings, of single means for simultaneously varying the excitation of said field windings, and means dependent upon a material departure in the speed of either machine from normal for actuating said single varying means to weaken the field excitation, whereby the machine speeds are equalized and immediate recurrence of said speed departure is prevented.
6. ln a system of control, the combination with a plurality of dynamo-electric machines severally having armatures and eld windings, of single means for simultaneously varying the excitation of said field windings, and means dependent upon the slipping of any machine for actuating said single varying means to modify the field excitation, whereby said sli]f ping7 is remedied and immediate recurrence thereof is obviated.
7. ln a system of control, the combination with a plurality of dynamo-electric machines severally having armatures and field windings, of means for separately exciting said field windings, a controller for regulating such excitation, means for operating said controller in either direction, and means dependent upon a material Voltage difference of either machine from normal for actuating said operating means to weaken the field excitation, whereby said voltage difference is eliminated and immediate recurrence thereof is prevented.
8. ln a system of control, the combination with a plurality of dynamo-electric machines severally having armatures and field windings, of means for separately exciting said field windings, a controller for regulating such excitation, an electrically-governed apparatus for operating said controller in either direction, and means dependent upon the slipping of any machine for energizing said electrically governed apparatus to modify the field excitation, whereby said slipping is remedied and immediate recurrence thereof is prevented.
9. In a system of control, the combination with a plurality of dynamo-electric machines severally having armatures and field windings, of means for separately exciting said field windings, a controller for regulating such excitation, an apparatus having a plurality of actuating coils for operating said controller in either direction, and a plurality of relay devices energized from the respective armatures and severally provided with contact members that are connected in circuit with one of said coils under predetermined conditions.
l0. ln a system of control, the combination with a plurality of dynamo-electric machines severally having armatures and field windings, of means for separately exciting said field windings, a controller for regulating such excitation, an apparatus'having a plurality of actuating coils for operating said controller in either direction, and a plurality of relay devices connected across the respective armatures and severally provided with contact members that are connected in series-circuit relation with one of said coils only when the voltage dierence of each machine from normal is less than a predetermined value.
l1. In a system of control, the combination with. a plurality of dynamo-electric machines severally having armatures and field windings, of means for separately exciting said field windings, a controller for regulating such excitation, an apparatus having a plurality of actuating coils for operating said controller in either direction, and a plurality of relay devices connected across the respective armatures and severally provided with contact members that are connected in series-circuit relation with one of said coils only when the voltage difference of each machine from normal is less than a predetermined valuc, and another relay device governed by the main-m achine current for opening and closing the circuit of the other coil.
In testimony whereof l have hereunto subscribed my name this 31st day of May,
CHARLES C. VVHTTAKER.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028597A (en) * 1974-07-12 1977-06-07 The Raymond Corporation Motor control systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028597A (en) * 1974-07-12 1977-06-07 The Raymond Corporation Motor control systems

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