US2150382A - Regulating transformer - Google Patents

Regulating transformer Download PDF

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Publication number
US2150382A
US2150382A US147771A US14777137A US2150382A US 2150382 A US2150382 A US 2150382A US 147771 A US147771 A US 147771A US 14777137 A US14777137 A US 14777137A US 2150382 A US2150382 A US 2150382A
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Prior art keywords
transformer
regulating
winding
case
contact
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Expired - Lifetime
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US147771A
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English (en)
Inventor
Leischner Georg
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Julius Pintsch AG
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Julius Pintsch AG
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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 invention relates to a regulating transformer for the practically stepless regulation of potential with a set of brushes rotatable about the core of the transformer or with a rotatable winding.
  • the subject-matter or the invention is a regulating transformer by means of which there can be obtained an increase of the regulated potential that is approximately continuous or as finely graduated as desired without its being necessary to provide special potential dividers.
  • the iron core of this transformer is divided, and the regulating winding is applied to the core and, if required, provided with tappings led through between the limbs, for the time being traversed by a part of the exciting flux, so
  • the potential is varied by an amount which corresponds to only a fraction of the entire exciting flux and which may be made as small as desired and, consequently, only a fraction of the complete turn potential.
  • the transformer is constructed as a shell-type transformer the shell of which is divided into several separate return paths.
  • the tappings of the regulating winding surrounding the main limb are then advantageously led outwards between these return paths and there formed as a spiral contact path which extends parallel to the regulating winding and along which then slides thebrush, which is preferably rotatable about the transformer.
  • the transformer is given an extremely compact and closed form, which is particularly advantageous also as regards leakage losses.
  • the several regulating turns with tappings are constructed in the form of annular and slit metal sheets.
  • Each metal sheet is connected at the slit with the succeeding metal sheet in such a manner that there results a helical turn arranged around the main core.
  • Figure 1 is a, vertical section through one form of construction embodying my invention
  • Figure 1b is a horizontal section through the construction shown in Figure 1
  • Figures 2, 3 and 4 are elevations, partly in section, and Figures 21), 3b and 4b horizontal sections, respectively, showing three 5 other embodiments of the invention
  • Figure 5 is a diagrammatic illustration of a three-phase transformer system constructed in accordance with the invention.
  • i denotes the core of the regulating transformer, which is in this case surrounded by twelve return paths 3.
  • the laminated core I has the form of a hollow cylinder and is composed of separate (twelve) segments ( Figure 1b).
  • the connection with the return paths, which are 'likewise laminated in the direction of the radius, is efiected by means of yoke plates 2, which may if required also be laminated.
  • the yoke plates serve at the same time for-holding together the entire iron core and are pressed together by means of a spindle 8.
  • the bolts 6 and the spacing pieces I serve for supporting and holding the several annular sheets, which extend collectively helically around the core. Between the several turns there is a comparatively large interspace through which the 40 air can pass so that a good cooling of the transformer is ensured.
  • the widenings of the several tappings 4 located outside the core system produce a practically uninterrupted contact path which extends around the shell-type transformer spirally and along which travels the brush 9, which is preferably formed as a roller.
  • the primary windin 5 is, in the case of the constructional form according to Figure 1, divided into separate coils connected in parallelism (Fig ure 1a) in order to avoid too great leakage with the winding only partly switched in. This'arrangement is specially advantageous in the case of transformers with comparatively long cores.
  • the coils are advantageously arranged in such a manner that there is always a primary coil in the immediate neighbourhood of a switching turn ponent transformers the primary windings of which are all connected together in parallel and are consequently mutually independent; of the condition of loading of the secondary circuit.
  • the division of the primary cylindrical winding into separate disc coils is advantageous not only for the purpose of reducing the leakage to a, minimum but also when it is a question of fixing the leakage to any desired value in accordance with the given conditions. This is essential particularly for welding transformers and also for variable choking coils.
  • vantages attach to connecting all the coil ends of the primary winding to one terminal board or to a suitable switch for the purpose of connecting the coils of the primary winding according to requirements alternatively in groups, in series or in parallel.
  • the transformer constructed according to the invention is exceedingly safe as regards shortcircuiting, and individual tappings can be shortcircuited without difficulty during the regulating operation.
  • each contact 4 corresponds to the twelfth part of the turn potential.
  • this current is itself very small; because it can be produced only by a twelfth part of the turn potential, and it is moreover further reduced owing to the fact that the flux' produced by it compensates the exciting hut in the surrounding component limb and deflects it into the other component limbs.
  • the flux deflection owing to suitaround the transformer again a symmetrical loading of the component cores.
  • the transformer constructed according to the invention presents great advantage when flux defiection is rendered possible inasmuch as special load switches need not be provided in this case, and on the contrary, the current-collecting brush can regulate the load circuit directly.
  • the regulating operation itself takes place, in s the case of the constructional example here represented, by rotating the entire transformer on the base-plate M, for example, by means of a force applied to the axle i3.
  • the rotary mo- 8 tion is transmitted to the roller brush 9, which thereupon, moving axially, rolls on the tappings of the secondary winding 4.
  • the transformer may be fixed as a whole and the brush, for example, lows-likesupport and former cores and thus shifted axially.
  • a guiding device forthe brush there may serve the correspondingly formed regulating winding or its taDpings.
  • FIG. 3 A similar construction, likewise in auto-transformer connection, is shown in Figure 3.
  • the turn potential is in this case divided into eight steps, and the core I has eight return paths 8.
  • the core itself is composed of sheet-metal bunbeing fastened to a galdles stepped in relation to one another, and has essentially the form of a cross.
  • the several return paths are arranged circularly about the core and have respective yokes 2, with-which they are extended over the core I ( Figure 3). sheets of the return paths I have rectangular projections forming the yokes 2.
  • the transformer is constructed as two-winding transformers, there may be arranged around the core a special primary winding in a manner similar to that of Figure 1.
  • the annular metal sheets I put together to form a spiral are here, as is shown 'in Figure 3a, placed substantially edgewise.
  • the tappings 4' and may be'also a larger or smaller annular edge of the sheets, extend substantially horizontally and at right angles to the parts of the sheets that are placed edgewise.
  • This arrangement has the .advantage that the distribution of the winding within the transformer is facilitated and that, moreover, the ac tion of the skin effect can be suppressed in a favourable manner.
  • the load current will be able to deflect the exciting flux in each case at most out of one of the return paths 3, so that an injurious rise of the load-dependent potential drop atthe ends of the regulating winding does not occur.
  • Both the position and also the number of the turns of the equalizing windings is a suitable means for enabling the magnitude of the flux deflection to be adjusted.
  • the equalizing windings on the yokes 2 will impede the flux shifting less than when the windings are arranged on the return paths 3.
  • the laminated core I is formed as .a hollow cylinder and the metal sheets are advantageously put together in involute form ( Figure 4b).
  • the regulating winding "4 is arranged around the core.
  • the primary winding 5 is again divided into disc coils which are connected in parallel and of which each is located between the metal sheets 4 ( Figure 4a).
  • equalizing windings maybe arranged on the return paths or on their yokes, and indeed all the coils of this winding are then adconnected yoke plates vantageously connected in parallel so that a deflection of the exciting flux from one return path to the other is practically altogether impossible.
  • the guiding of the roller brush 9 is effected by means of two arms I6, which are mounted on the central axle l3 of the transformer and are insulated in relation thereto.
  • one of the arms may in some cases be omitted. It may be advantageous to use two current-collecting brushes and to shift them in opposite directions from the middle of the regulating winding.
  • transformers in which the primary winding is formed as a cylindrical winding (of coils not connected in parallel) there then results the advantage that the leakage of the transformer is considerably reduced.
  • a regulating transformer having an iron core with a main limb and several magnetic return paths connected with the main limb and arranged in spaced relation around the main limb, a regulating winding surrounding the main limb and a current-collecting brush, the regulating winding being provided with tappings, the tappings extending between the return paths to the periphcry of the transformer and there forming a helical contact-path which extends parallel to the turns of the regulating winding, and means mounting said brush in contact with said helical contact-path and permitting relative movement between the same.
  • a regulating transformer having an iron core with a main limb and several magnetic return paths connected with the main limb and circularly disposed in spaced relation around the main limb, a regulating winding surrounding the main limb and having tappings which extend between the returnpaths to the periphery of the transformer and form a helical contact path extending parallel to the turns of the regulating winding, a current collector, and means mounting said current collector for sliding movement along said contact path, the current collector being constantly in contact with said contact path so thatduring its movement, before leaving one contact of the contact path, it has already reached the succeeding contact.
  • a regulating transformer having an iron path.
  • a regulating transformer according to claim 5 in which round a return-path, the current-collecting brush being so dimensioned that during its movement, before leaving one segment, it has already reached the next.
  • a regulating transformer comprising an iron core with a main limb and several magnetic return paths arranged inspaced having a main relation around the main limb, an exciting winding, winding, and a current collector,
  • a regulating the exciting tact path which extends parallel to the turns of the regulating winding, and means mounting said current collector for movement in contact with said spiral contact path.
  • a regulating transformer comprising an iron core with a main" limb and several magnetic return paths circularly disposed in spaced relation spiral contact-path which extends parallel to the turns of the regulating winding, and means mounting said current-collector for movement in contact with said spiral contact path.
  • a regulating transformer having an iron core, composed main limb and several magnetic return paths circularly disposed in spaced relation around the main limb, the main limb being formed tubularly form a helical contact path which extends parallel to the turns of the regulating winding and along which may slide a current-collector.
  • a three-phase regulating transformer comprising three single-phase transformers, each single-phase transformer comprising an iron core limb and several magnetic return paths arranged in spaced relation around the said three single-phase transformers for rotation about their respective axes, three current-collecta spiral conof laminated sheets, including a arouses 5 ins brushes in the form of contact rollers each of which is located between two of the singlephase transformers and in contact with the said contact paths of these two transformers simultaneously, and means mounting the contact rollers for movement in the axial direction at the windings, the contact rollers forming together the star point of the three-phase transformer.
  • a regulating transformer as recited in claim CERTIFICATE OF CORRECTION 16.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
US147771A 1936-06-11 1937-06-11 Regulating transformer Expired - Lifetime US2150382A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE497041X 1936-06-11

Publications (1)

Publication Number Publication Date
US2150382A true US2150382A (en) 1939-03-14

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Application Number Title Priority Date Filing Date
US147771A Expired - Lifetime US2150382A (en) 1936-06-11 1937-06-11 Regulating transformer

Country Status (5)

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US (1) US2150382A (fr)
BE (1) BE422031A (fr)
FR (1) FR822945A (fr)
GB (1) GB497041A (fr)
NL (1) NL47353C (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2452490A (en) * 1943-06-22 1948-10-26 Hartford Nat Bank & Trust Co Continuously variable inductance
US2463105A (en) * 1943-08-24 1949-03-01 Henniker Reginald Charles Variable inductor
US2579308A (en) * 1948-11-04 1951-12-18 Gen Electric Transformer
CN115691988A (zh) * 2022-12-27 2023-02-03 深圳桐源芯动力科技有限公司 一种可调节式的电感器组件及其屏蔽结构

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2452490A (en) * 1943-06-22 1948-10-26 Hartford Nat Bank & Trust Co Continuously variable inductance
US2463105A (en) * 1943-08-24 1949-03-01 Henniker Reginald Charles Variable inductor
US2579308A (en) * 1948-11-04 1951-12-18 Gen Electric Transformer
CN115691988A (zh) * 2022-12-27 2023-02-03 深圳桐源芯动力科技有限公司 一种可调节式的电感器组件及其屏蔽结构
CN115691988B (zh) * 2022-12-27 2023-03-28 深圳桐源芯动力科技有限公司 一种可调节式的电感器组件及其屏蔽结构

Also Published As

Publication number Publication date
GB497041A (en) 1938-12-12
BE422031A (fr)
FR822945A (fr) 1938-01-11
NL47353C (fr)

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