US2818545A - Saturable core reactor system - Google Patents

Saturable core reactor system Download PDF

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Publication number
US2818545A
US2818545A US310712A US31071252A US2818545A US 2818545 A US2818545 A US 2818545A US 310712 A US310712 A US 310712A US 31071252 A US31071252 A US 31071252A US 2818545 A US2818545 A US 2818545A
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US
United States
Prior art keywords
transductor
current
core
windings
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US310712A
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English (en)
Inventor
Lamm Uno
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ABB Norden Holding AB
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ASEA AB
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Filing date
Publication date
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Publication of US2818545A publication Critical patent/US2818545A/en
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00—Automatic controllers
    • G05B11/01—Automatic controllers electric
    • G05B11/012—Automatic controllers electric details of the transmission means
    • G05B11/016—Automatic controllers electric details of the transmission means using inductance means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F9/00—Magnetic amplifiers
    • H03F9/04—Magnetic amplifiers voltage-controlled, i.e. the load current flowing in only one direction through a main coil, e.g. Logan circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/45—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F2003/106—Magnetic circuits using combinations of different magnetic materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias

Definitions

  • the object of the present invention is to provide an improvement of'a transductor (i. e. a presaturated-reactor) to obtain a remaining alteration of a quantity controlled by a temporarily-acting controlcurrent.
  • a transductor i. e. a presaturated-reactor
  • Transductors' as well as electron-tubes belongto a type of control apparatus in which the-output quantity follows the variations of the input quantity andthu-s returns to some fixed value when the input quantity disappears.
  • transductors have previously been used in cases when it is desired to obtain an output quantity following an adjustable input quantity but remaining when the latter has disappeared, it has generally been necessary to make use of a device comprising mechanically controlled members such as for instance mechanically driven potentiomete'rs.
  • a device of the last mentioned gtype may for instance be'used to maintain a setting of the current in a lofadto alternate this current at certain moments only by aid of electrical impulses.
  • the described device may also be used to maintain a test value, for'instance the maximum value of a varying quantity, or to maintain a test value obtained at-a moment When'the quantity to be measureddisappears.
  • The'desired result according to the invention isobtained by using a'trans-ductor of which the outstanding feature is that the part of the transductor core which is-arr-a-nged to be traversed substantially only by a direct current flux is at least partly made of a material having appreciable hysteresis.
  • FIG. 1 schematically shows a suitable transductor core with windings according to the invention.
  • Fig. 2 shows a diagram of the load voltage as a function of the control current of a transductor having such a core.
  • Fig. 3 a diagram of connections is shown illustrating a form of the invention.
  • the single-phase transductor illustrated consists of a three-legged core 1 provided with alternating current windings 2 and 3 arranged on the outer legs.
  • a part 4 of the length of the central leg, which at such a core may be substantially free from alternating current flux by proper arrangements of the alternating current windings, is made of a material having a hysteresis loop of considerable width and of as rectangular a form as possible. This is attained if the said part 4 for instance consists of magnetic steel.
  • the central leg is provided with two direct current control windings 5 and 6, one of which may suitably be a winding for self-excitation of the transductor.
  • the whole length of the central leg is made of magnetic steel, and if desired it may be provided with further control windings.
  • the latter must not, however, be 'arranged 0n the central leg, the same result may be obtained by arranging them on the outer legs, and winding them in proper direction.
  • cont'rol curve ofthe transductor Thelform of the contr'ol curve: will the highly depending on the properties of: the iron in the partof lthe;transductor:'whichdsmot"subject to an alternating current ifiux; for finstance the' central leg of a transductor according .to Fig. -l.
  • the voltage will thus only besubject to an insignifi'cantdecrease, 'and this decrease may be-kept at a low value if the transductor'has been 'so dimensioned that 11 the remanent flux of the mag netic steel part in the legwhich is free fromaltern'ating current-flux can develop-am m. f. which isable' to' replace the control-ampereturns from the current is :when this disappears.
  • a connection: diagram :for: a transductor according "to the invention is'shown' in Fig.1 3
  • the two alternating cur rent windings 2 and 3 on the: core' :1-'Iarei in series with self-magnetization rectifiers 7, fi'con'nected inparallel in amalternatingcurrent circuit connected to terminals 9 ⁇ 10 and further compri'sing :a full wave: rectifier 'lltand a load 12.:-
  • tlr'a't th e transductor is provided 1 with a selfmagnetiiatio'n which is as complete as possible to maintain the stability. If this desire is fulfilled only a few numbers of ampereturns are necessary to maintain the output voltage. In order to attain this result, a direct current is drawn from the rectifier 11 which may traverse a winding 5 which is arranged on the central leg. It is understood, however, that even other ways are available to increase the degree of selfmagnetization, for instance by arranging winding parts on the legs provided with alternating current windings so that each part is traversed by the rectified portions of the current in the alternating current winding on the opposite outer leg.
  • a direct current supplied from the terminals 14 is arranged to traverse a control winding 13 on the central leg or alternatively on the outer leg.
  • This direct current serves as a premagnetization current like the current i; in Fig. 2.
  • the control current i may be applied to the transductor by aid of a winding 6.
  • this winding may be fed via an adjustable resistor which is suitably so connected that positive as Well as negative control current may be obtained.
  • time-delay means in the control circuit, for example a capacitor 15 and a resistor 16 and to arrange it so that different poles of the control current source 17 may be connected by means of one of two contacts 18 and 19.
  • the transductor and its auxiliary means By suitable dimensioning of the transductor and its auxiliary means according to Fig. 3 it will be possible to obtain a voltage across the load which is increased from an initially low value by closing the contact 18 which suitably should be designed with a pressure contact. The increase of voltage will then be made dependent on the time during which the button is pressed, and owing to the delay circuit it will be possible to magnetize the transductor in dependence of the time during which the button is pressed. When the button is released, the transductor will maintain an output voltage, i. e. a voltage across the load which is unchanged except for the previously mentioned relatively insignificant decrease. To diminish the output voltage the button 19 is pressed during a time which corresponds to the desired decrease of voltage.
  • the transductor or its auxiliary circuits may be provided with other delaying members by which the resetting will be slower, and by which the transductor may be controlled with a higher precision.
  • delaying members may consist of a capacitor or an inductance in the control circuit, self-magnetized circuit or output circuit arranged in any way known per se. They may also consist of thermic devices, for instances thermistors. In the latter cases, the controlling of the transductor may not only be performed by pressure buttons or such members but also in other ways.
  • a transductor of the described type may be controlled to give an output quantity which is dependent either on the duration or on the product of the duration and magnitude of a current or a voltage applied to the input side of the transductor.
  • a transductor device comprising a multilegged core structure having windings for alternating and direct currents, respectively, means for energizing said windings, a load in circuit with said alternating current windings, means whereby said last mentioned windings are arranged to give two interlinked magnetic circuits, said core having one common 'core leg free from alternating current flux, and said direct current windings being arranged to give a direct current flux in said common core leg, at least part of the length of said common core leg consisting of a magnetic material having an appreciably larger hysteresis than the rest of the core, and control means in circuit with at least one of said direct current windings, the control action of said last mentioned winding being operative on the ascending part of the hysteresis loop of the transductor curve.
  • a transductor device comprising a threelegged core structure, alternating current windings on the outer legs of the core, direct current windings on the central leg, at least part of the length of the central leg consisting of a magnetic material having an appreciably larger hysteresis than the rest of the core.
  • a transductor device comprising a threelegged core structure, alternating current wind,- ings on the outer legs of the core, direct current windings on the outer legs of the core, said direct current windings being so arranged and connected as to give rise to cooperating magnetic fields in the central leg of the core, at least part of the length of said central leg consisting of a magnetic material having an appreciably larger hysteresis than the rest of the core.
  • a transductor device comprising means for self-magnetization of the transductor.
  • a transductor device comprising a number of direct current windings, one of which being arranged to pre-magnetize the transductor to a certain basic point, and another of which being adapted to receive a temporarily acting control current of a certain polarity, and a capacitor-resistor combination serving as a time-delay device in circuit with said last-mentioned winding.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Hard Magnetic Materials (AREA)
  • Dc-Dc Converters (AREA)
  • Load-Engaging Elements For Cranes (AREA)
US310712A 1951-09-22 1952-09-20 Saturable core reactor system Expired - Lifetime US2818545A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE306767X 1951-09-22

Publications (1)

Publication Number Publication Date
US2818545A true US2818545A (en) 1957-12-31

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ID=20307535

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Application Number Title Priority Date Filing Date
US310712A Expired - Lifetime US2818545A (en) 1951-09-22 1952-09-20 Saturable core reactor system

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US (1) US2818545A (en(2012))
BE (1) BE514329A (en(2012))
CH (1) CH306767A (en(2012))
FR (1) FR1063532A (en(2012))
GB (1) GB705242A (en(2012))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932787A (en) * 1956-03-19 1960-04-12 Allis Chalmers Mfg Co Magnetic amplifier
US3700913A (en) * 1970-08-12 1972-10-24 Hughes Aircraft Co Trigger transformer for pulse forming network
US4205288A (en) * 1978-10-27 1980-05-27 Westinghouse Electric Corp. Transformer with parallel magnetic circuits of unequal mean lengths and loss characteristics

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1910381A (en) * 1929-12-26 1933-05-23 Union Switch & Signal Co Electrical translating apparatus
US1921703A (en) * 1931-11-13 1933-08-08 Gen Electric Variable reactance device
US2465451A (en) * 1946-08-27 1949-03-29 Asea Ab Saturable reactor regulator
US2470556A (en) * 1945-11-16 1949-05-17 Asea Ab Rectifier with a voltage regulating reactor saturable by direct current
US2552203A (en) * 1948-04-02 1951-05-08 Gen Electric Voltage doubler magnetic amplifier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1910381A (en) * 1929-12-26 1933-05-23 Union Switch & Signal Co Electrical translating apparatus
US1921703A (en) * 1931-11-13 1933-08-08 Gen Electric Variable reactance device
US2470556A (en) * 1945-11-16 1949-05-17 Asea Ab Rectifier with a voltage regulating reactor saturable by direct current
US2465451A (en) * 1946-08-27 1949-03-29 Asea Ab Saturable reactor regulator
US2552203A (en) * 1948-04-02 1951-05-08 Gen Electric Voltage doubler magnetic amplifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932787A (en) * 1956-03-19 1960-04-12 Allis Chalmers Mfg Co Magnetic amplifier
US3700913A (en) * 1970-08-12 1972-10-24 Hughes Aircraft Co Trigger transformer for pulse forming network
US4205288A (en) * 1978-10-27 1980-05-27 Westinghouse Electric Corp. Transformer with parallel magnetic circuits of unequal mean lengths and loss characteristics

Also Published As

Publication number Publication date
FR1063532A (fr) 1954-05-04
BE514329A (en(2012))
GB705242A (en) 1954-03-10
CH306767A (de) 1955-04-30

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