US2233842A - Regulating transformer with contact-ring current collector - Google Patents

Regulating transformer with contact-ring current collector Download PDF

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Publication number
US2233842A
US2233842A US224803A US22480338A US2233842A US 2233842 A US2233842 A US 2233842A US 224803 A US224803 A US 224803A US 22480338 A US22480338 A US 22480338A US 2233842 A US2233842 A US 2233842A
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Prior art keywords
regulating
contact
winding
flux
ring
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Expired - Lifetime
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US224803A
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English (en)
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Leischner Georg
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Individual
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Individual
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    • 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
    • H01F29/06—Variable transformers or inductances not covered by group H01F21/00 with current collector gliding or rolling on or along winding

Definitions

  • the subject of the invention is a regulating transformer, that is, a regulating choking coil in which, with the aid of a deviation of the flux, the throwing in and out of winding elements or turn portions is made possible without any particular arrangement of the regulating winding.
  • the regulating winding is the same as the low tension winding of a normal transformer and formed as a single-layer cylindrical spiral winding, with a bare outside surface serving as contact surface.
  • the current-collecting from the regulating winding is not done with brushes or rollers, which, together with the winding are subjected to great rear, but is effected with the aid of a contactormember shaped to make contact with the regulating winding and free to be moved along the turns of said regulating winding.
  • Fig. 1 shows a longitudinal section of a regulating transformer
  • Fig. 2 a cross section of the same, but without collector
  • Fig. 3 and 4 show a plan and a section of a contact-ring current-collector
  • Fig. 5 and 6 show a regulating transformer comprising all parts shown in Fig. 1 to 4.
  • Fig. '7 shows a cross section of the same regulating transformer in one position, while Fig. 8 represents another position,
  • Fig. 9 and 10 show a regulating transformer with two magnetic return-flux yokes
  • Fig. 11 shows a regulating transformer with four magnetic return-flux yokes
  • Fig. 12 shows a regulating transformer with six magnetic return-flux yokes
  • Fig. 13 represents a combination of three regulating transformers to form a three-phase current-regulator
  • Fig. 14 shows an arrangement analogous to that of Fig. 1.3, but having the inner return-flux yokes diiferently arranged.
  • Fig. 15 shows a simplified arrangement of Fig. 14.
  • the illustrated iron body comprises a core I with the magnetic return-fiux yokes 2, which are connected in parallel with a View to diminishing the dissipation of energy when the secondary winding is only partially loaded.
  • the secondary winding is of flat copper strip wound on edge and provided with a tight intermediate insulating layer which is arranged spirally between the turns and projects beyond the outside face.
  • the regulating transformer thus arranged without current collector, resembles a normal power transformer.
  • the large circular bore 8 of the contact ring, Figs. 3 and 4 surrounds the regulating winding 4 and touches said winding at one place, while the square holes 9 of said ring encompass the magnetic return-flux yokes Z and communicate with the here by means of the slots 1 i.
  • the closed portion of the ring encompasses the fluxes of core and yoke opposed to each other, so that no e1ectro-motive force is induced in the same and also no equalising or short-circuit current can be generated.
  • the contact making of the contact-ring current-collector 5 with the regulating winding 4 at any portion of the same is effected by spindles 6, provided in the holes Hi and running with the eccentrically arranged trunnions l in bearings 8, being rotated in synchronism, whereby the ring 5 with the inside surface of the bore 8 rolled on and along the surface of the regulating windmg.
  • Fig. 8 the contact ring is in the opposite position.
  • the other slot II is now short-circuited and the flux of the return-flux yoke 2 is dislodged.
  • the return-flux yoke 2' in this position has to carry the whole flux.
  • the dotted line represents the path of theshort-circuit current which encompasses the return-flux yoke 2.
  • the regulating winding 4 is of round wire.
  • the primary winding 3 consists of 10 branch spools, which are in parallel to diminish the leakage.
  • the insulation between primary and secondary winding is formed as a cylindrical body, provided on its outside with a spiral groove destined to carry the regulating winding 4 of round wire.
  • One-half of this winding l projects from the insulating cylinder and serves as a contact surface.
  • the contact surface of the current collector ring 5 is concave and is adjusted to the convex surface of the regulating winding 4.
  • the current collector 5 is not circular on the outside, but is rectangular and adjusted to the profile of the transformer.
  • the spindles 6 with trunnions or eccentrics "i are arranged outside on both sides of the magnetic return-Jinx yokcs.
  • the spindles 5 are threaded, the pitch of which corresponds to that of the regulating winding 4.
  • the spindles 6 are connected by pinicns (which could also be chain or crank gears) in such a manner with each other, that, on a synchronous running of the same, a correct guiding of the contact ring along the regulating winding is ensured.
  • regulating transformers Figs. 1 to 10, described in the above, are formed with two magnetic return-flux yokes, whereby one throwing-in and cutting out of half-turns of the regulating Winding only is possible.
  • the throwing-in and regulating steps should be smaller than one-ha1f turn (fine-regulator), the number of the magnetic return-flux yolzes must be increased.
  • the regulating transformer according to Fig. 11 which comprises four magnetic return-flux yokes 2 and a contact ring 5 with four contact seg ments.
  • This contact ring is driven by the spindles or shafts 6 and is rolled along the surface of the contact Winding 4.
  • the primary winding 3 is located inside the regulating winding 4 and encompasses the cores I which carry the flux.
  • Each magnetic return-flux yoke carries the flux 4 /4.
  • Fig. 12 shows a regulating transformer with a. core I and six magnetic return-flux yokes 2 each of which carries I /6 of the main flux 1'
  • the primary winding 3 is arranged inside, while the regulating winding 4 is arranged outside.
  • the contact ring 5, driven by the shafts or spindles 6, is provided with six contact segments rolling along the smooth surface of the regulating winding during the regulating operation.
  • the fne-regulation may be improved at will.
  • a combination of three regulating transformers, forming a. three phase regulator, is represented in Fig. 13.
  • the cores I carry the primary winding 3 on the inside, while the secondary winding 4 is arranged on the outside.
  • Each core I has two magnetic return-flux yokes 2, 2' arranged on both sides of the same.
  • the contact rings of the three transformers are combined in one segment 5, which is driven by the spindles or shafts 6 journalled by means of the trunnions l and is moved along the regulating winding 4.
  • Each of the slots between the halves of the contact surfaces is staggered at 120 in the different transformers. Thereby the dislodging of the flux of the single transformers, that is, of the return- I'illX yok-es, is effected alternately with spacings of 60 angular movement of the contact segment.
  • Fig. 14 shows an arrangement analogous to that of Fig. 13 with the difference, that the return-flux yokes 2 on the inside are each united to form one return flux yoke, carrying the fluxes of two neighbouring phases.
  • the marking of parts in Fig. 14 is similar to that in Fig. 13.
  • Fig. 15 The arrangement represent-ed in Fig. 15 is simplified compared to that of Fig. 14.
  • Fig. la By the omisslon of the magnetic return-flux yokes 2 (Fig. la) the apparatus is changed into a five-legged transformer with three main cores I and two return fiux-yokes 2 arranged on the two sides.
  • the contact segment 5 (Figs. 13 to 15) forming a whole, may be formed with three single segments provided with flexible electrically conducting intermediate members and may carry resilient connections to transmit the adjusting forces, so that the segments of the single phase windings may be adapted individually to the occasional condition of the regulating winding.
  • the electric separation may be eifected in three partial segments with insulating pieces, also in such cases where an electric division of the single phases is necessary.
  • the leading away of the current from the contact segments is effected by means of flexible connections or slide rails.
  • spindles or shafts B may be used as conductors from the movable contact system to the stationary terminals.
  • oval or rectangular windings with contact segments fitted to the surface form of the same, maybe used instead of the circular Winding.
  • the regulating windings may also be made of aasacac aluminium with a thin coating of copper (Cupal).
  • the small webs 52 of the contact segments 5 may be fo med with an increased resistance or as resistance connectio is to damp the short-circuit current during the disconnection of the flux or to reduce it to harmlessness.
  • the current admission is effected preferably ,at the middle portion of the resistance connections, so that one-half of the current flows to each side; since all centres of these resistance connections carry the same potential, they may be connected to each other metallically thus forming one conneotion.
  • the surface of the regulating winding may also be provided with grooves or flutings into which the contact ring engages to ensure a safer contact-making and guiding.
  • the outer edge of the regulatin winding may be made flat and projecting and with lateral contact surfaces, which are in contact with flange-like edges of the contact ring to ensure a safe contact.
  • the surface of the regulating winding of the inside surface of the contact ring may be provided with projecting portions similar to pressure contacts which serve as good contact makers.
  • a regulating transformer according to the invention may be used with advantage as chokecoil to commute the load current in step transformers from one step to the other.
  • the apparatus is also especially adapted as an adjustable inductance for electric welding and for many other purposes.
  • the regulating transformers may also be constructed with several current collectors for each regulating winding.
  • several electrically separated windings may be arranged inside one another or, if consisting of several groups, one above the other, each of said groups being provided with one or more current collectors.
  • a regulating transformer comprising a magnetic circuit with a plurality of flux return path cores, primary and secondary windings interlinked with said cores, the secondary winding being a circular coil and serving as a regulating Winding, a contactor plate surrounding the regulating winding and having a circular opening of greater internal diameter than the external diameter of said regulating winding and making a one point electrical contact with said winding, said contactor plate having slots therein traversed by the said cores, the walls of each slot adjacent the internal circumference of the opening having a gap therein capable of being bridged by the external rim of said regulating winding, and means for shifting the point of contact between said contactor plate and said regulating winding in a circular path to bridge any of said slot gaps and for shifting said point of contact axially to bring any desired turn of said regulating winding into contact with said contactor plate.
  • a multi-phase transformer comprising three magnetic circuits each with a plurality of flux return path cores, primary and secondary windings for each magnetic circuit and each interlinked with said respective cores, each secondary winding being a circular coil and serving as a regulating winding, 2.
  • contactor plate surrounding the regulating windings and having three circular openings each of greater internal diameter than the external diameter of said regulating winding and making a one point electrical contact with said winding, said contactor plate having slots therein for each opening traversed by the said cores, the walls of each slot adjacent the internal circumference of the opening having a gap therein capable of being bridged by the external rim of said regulating winding, and means for shifting the three points of contact between the contactor plate and the regulating windings in circular paths to bridge any of said slot gaps and for shifting the points of contact axially to bring any desired turn of said regulating windings into contact with the contactor plate.
  • a regulating transformer according to claim 1 in which a plurality of cores are provided, and in which the contactor plate is provided with a pair of slots for each core.
  • a regulating transformer according to claim 1 in which ohmic resistances are provided in the contactor plate of which the resistances connect the parts of the plate lying on both sides of each opening.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Transformers For Measuring Instruments (AREA)
US224803A 1937-08-14 1938-08-13 Regulating transformer with contact-ring current collector Expired - Lifetime US2233842A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE206515X 1937-08-14
DE250937X 1937-09-25

Publications (1)

Publication Number Publication Date
US2233842A true US2233842A (en) 1941-03-04

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US224803A Expired - Lifetime US2233842A (en) 1937-08-14 1938-08-13 Regulating transformer with contact-ring current collector

Country Status (5)

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US (1) US2233842A (is")
CH (1) CH206515A (is")
FR (1) FR844847A (is")
GB (1) GB517987A (is")
NL (1) NL49101C (is")

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490274A (en) * 1946-12-06 1949-12-06 Moravian Electrical Engineerin Method of regulating shunt commutator motors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490274A (en) * 1946-12-06 1949-12-06 Moravian Electrical Engineerin Method of regulating shunt commutator motors

Also Published As

Publication number Publication date
CH206515A (de) 1939-08-15
NL49101C (is")
GB517987A (en) 1940-02-14
FR844847A (fr) 1939-08-02

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