EP2975618A1 - Noyau pour un dispositif d'induction électrique - Google Patents

Noyau pour un dispositif d'induction électrique Download PDF

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Publication number
EP2975618A1
EP2975618A1 EP14177246.7A EP14177246A EP2975618A1 EP 2975618 A1 EP2975618 A1 EP 2975618A1 EP 14177246 A EP14177246 A EP 14177246A EP 2975618 A1 EP2975618 A1 EP 2975618A1
Authority
EP
European Patent Office
Prior art keywords
core
laminated cores
laminated
partial
cores
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.)
Granted
Application number
EP14177246.7A
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German (de)
English (en)
Other versions
EP2975618B1 (fr
Inventor
Jörg FINDEISEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP14177246.7A priority Critical patent/EP2975618B1/fr
Priority to PCT/EP2015/065002 priority patent/WO2016008727A1/fr
Priority to US15/326,886 priority patent/US9941043B2/en
Publication of EP2975618A1 publication Critical patent/EP2975618A1/fr
Application granted granted Critical
Publication of EP2975618B1 publication Critical patent/EP2975618B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/02—Cores, Yokes, or armatures made from sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H01F27/2455—Magnetic cores made from sheets, e.g. grain-oriented using bent laminations

Definitions

  • the invention relates to a core of an electrical induction device, preferably a transformer or a throttle.
  • the state of the art is laminated from sheets (also called magnetic sheets or core sheets) layered cores, these are also called stack cores. Such cores can be performed by cutting different width sheets, graded for each individual laminated core. Furthermore, cores (also called band cores) are known in which the sheet is wound coil-shaped largely uninterrupted.
  • the material used for the sheets mainly grain-oriented, cold-rolled sheet is used, which has a magnetic preferred direction in the rolling direction. Due to the layering of the core from these grain-oriented sheets, the heat resulting from the no-load losses is dissipated to and across the layer plane at different extents from the surface. This is expressed in a usually by the factor 6 ... 7 different thermal conductivity.
  • cooling ducts are used parallel to the layer plane in transformer construction, since they can be easily formed by inserting strips or spacers (for example, ceramic disks).
  • a disadvantage of this cooling channel formation is that the arrangement of the cooling channels can not exploit the favorable heat conduction parallel to the layer direction of the sheets.
  • amorphous core materials are used in distribution transformers.
  • the state of the art with regard to the use of amorphous core material is disclosed, for example, in the European published patent application EP 2 474 985 and Japanese Patent Publication JP 2010 289 858 described.
  • the invention has for its object to provide a core for an electrical induction device, which ensures better heat dissipation than previous cores.
  • the invention provides that at least one of the laminated cores is segmented and at least two partial laminated cores, which are two sheet packages each with their sheet metal end faces, which are transversely, in particular perpendicular to the layer plane of the laminated sheets, face each other, the sheet metal end faces of the two partial laminated cores a distance have to each other through which a gap extending perpendicular to the layer plane between the two partial laminated cores is formed and the gap forms a cooling channel or at least a portion of a cooling channel whose channel longitudinal direction extends transversely, in particular perpendicular, to the layer plane of the laminated sheets.
  • An essential advantage of the core according to the invention is that the good thermal longitudinal conductivity is achieved by the described arrangement of the cooling channels or transversely to the layer plane of the sheets the sheets is used for cooling the core. As a result, it is advantageously possible to achieve a reduction in the space requirement required for cooling and an increase in the filling factor for the core limb.
  • a further significant advantage of the core according to the invention is the fact that the described formation of the core of partial laminated cores is suitable both for cores layered from individual sheets and for cores wound from magnetic tapes.
  • the width of the laminated cores is different to form steps between stacked laminated cores.
  • the cross section of the core is adapted at least in sections to a circular cross section.
  • the number of different sheet widths in the partial laminated cores is preferably at most one third of the number of stages. Particularly preferably, the number of different sheet widths in the partial laminated cores is a maximum of three.
  • the sheet widths in the partial laminated cores are preferably identical.
  • At least two stacked laminated cores have an identical number of equally wide partial laminated cores but are nevertheless of different widths, wherein at least two partial corrugated iron packages are separated from one another by the or one of the cooling channels in the case of the broader laminated core.
  • the core viewed from the inside to the outside alternately has a laminated core of the first type and a laminated core of the second type, wherein in a laminated core of the first kind, at least two partial laminated cores, preferably all partial corrugated iron layers, are separated from each other by a gap or cooling channel, and wherein at least two partial laminated cores, preferably all partial laminated cores, lie without gaps on each other in a laminated core of the second type.
  • At least two stacked laminated cores of the first and second type have the same number of equally wide partial laminated cores.
  • the sheets are formed by a thin-walled strip material, preferably an amorphous strip material, and the laminated cores are each wound from this strip material.
  • At least one cooling channel is preferably additionally present whose channel longitudinal direction extends parallel to the layer plane of the laminated sheets.
  • a further preferred embodiment provides that the laminated cores are bent in sections, wherein the bending radii of at least two stacked laminated cores are selected such that in the bending region between these laminated cores, a cavity, preferably in the form of an arcuate gap, is formed, wherein the cavity with a the cooling channels or all the cooling channels communicates and allows feeding of a coolant through the cavity into the one or more cooling channels.
  • the width of the widest partial laminated core is preferably an integer multiple of the narrowest partial laminated core.
  • Tension bands are preferably used for the mechanical stabilization. Accordingly, it is provided in a further preferred embodiment of the core, that the wound partial laminated cores are stabilized and fixed by means of clamping bands, wherein the clamping bands are arranged on the laminated cores, that they each in their position to the clamping band of adjacent partial laminated core are offset and are designed such that forms a cooling channel in the space between the partial laminated cores.
  • clamping bands are arranged on the laminated cores, that they each in their position to the clamping band of adjacent partial laminated core are offset and are designed such that forms a cooling channel in the space between the partial laminated cores.
  • straps made of metallic non-magnetic material are preferably used.
  • windings with circular coils which are placed on the limbs of the core are preferred for transformers and chokes.
  • the cross-section of the limb is preferably stepped several times.
  • a further advantageous embodiment of the core provides for the formation of core stages from the laminated cores and thus an approximation to the circular shape of the winding when using core sheets only one or less sheet widths. At the same time the formation of effective and space-saving cooling channels is made possible.
  • the preferred core configurations are also suitable for cores of electrical induction devices which operate in the high-frequency range, since the above-mentioned advantages due to the frequency dependency of the magnetic reversal losses in these preferably come into effect and the application even with relatively small benefits offers economic benefits.
  • the bending radii of the wound partial laminated core of a composite core are each selected such that in each case a gap is formed for the circulation of a cooling fluid in the arc between leg and yoke.
  • the lower sheet for receiving the cooling fluid which flows transversely to the winding direction, is distributed within the arc on the cooling channels between the partial laminated cores to then ascend by the heating and exit at the upper arc between leg and yoke again.
  • the FIG. 1 shows an embodiment of a core 1 for an electromagnetic induction device, not shown.
  • the core 1 consists of a plurality of laminated cores 2, which are each formed by laminated sheets 11 of magnetizable material, wherein the laminated cores are parallel to the layer plane of the laminated sheets 11 to each other.
  • the laminated cores 2 is segmented and has a plurality of partial laminated cores 3.
  • the partial laminated cores 3 are at least partially arranged such that at the joint between the sheet metal end faces 3a of the partial laminated cores a gap results, which is dimensioned such that the flow of a coolant allows and a cooling channel 4 is formed.
  • the total width of the individual laminated cores 2 is determined in each case.
  • the height of the laminated cores 2 is adjusted by the number of layered sheets 11.
  • a stepped core is formed.
  • all core lamination packages 2 are formed from core sheet metal stiffeners or partial lamination stacks 3 of the same width.
  • the partial laminated cores 3 are each arranged alternately with or without a gap, that is, with or without cooling channels between the partial laminated cores 3. This results in a different overall width of the laminations 2 forming the steps of the core 1.
  • Every second laminated core has cooling channels 4, so that the number of stages doubles again, without the need for additional sheet metal widths. In this way it is possible to achieve a substantial approximation of a core leg to a circular shape. Consequently The use of round windings with high filling factor of the core is possible without the use of a variety of different sheet widths.
  • FIG. 2 shows a top view of the sectional view of a layer of magnetic laminated leg 6 of another embodiment of a core 1.
  • the leg 6 and connected thereto yoke 7 are stacked in the embodiment of individual sheets.
  • the individual sheets form in the transition region between the legs and yoke joints, which are offset in layers against each other and form a tapping.
  • the illustrated arrangement of the cooling channels 4 along the cut edges of the sheets 11 not only a good thermal conductivity of the sheets 11 is used transversely to the layer plane, but it can continue to use targeted cooling channels in the thermally highly stressed areas of the core.
  • Cooling channels in the already well cooled edge layers of the core 1 can be omitted, and a further increase in the filling factor of the core 1 is possible.
  • the FIG. 3 shows a third embodiment in which a five-stage core 1 using two different widths for the sheets 11.1 and 11.2 of the partial laminated cores 3 is executed. As a result, it is possible to form a finely graded core of high number of stages with only two different sheet widths of the core material.
  • the width of the largest partial laminated core 3 forms a multiple of the smallest width of a partial laminated core. Due to the aforementioned formation of multiples of the width of the partial laminated cores 3, the formation of connections between the cooling channels 4 of the successive laminated cores is simplified.
  • the embodiment according to FIG. 3 are provided by this design all stages with cooling channels 4, which are connected to each other such that a cooling medium can flow transversely to the laminar layer direction of the sheets 11.1 and 11.2.
  • the FIG. 4 shows a fourth embodiment;
  • the laminated sheets 11 of the laminated cores 2 are formed by means of a wound strip material.
  • This embodiment lends itself, for example, to sheets with preferred magnetic direction, since the sheet is obtained in strip form and can be wound without interruption.
  • the individual turns of the ribbon core are separated so staggered that in each case only one point of application lies in the magnetic circuit.
  • This wound core design is particularly suitable for the use of strips of amorphous core material or strips of nanocrystalline metals.
  • the layering of the winding layers is in the FIG. 4 shown in the sectional view of the leg 6. You can see that here only strip material of a width is used.
  • the strip material is continuous, each comprising two legs 6 and the yokes 7, wound.
  • the composition of the middle laminated cores from a plurality of partial laminated cores 3 creates a stepped core, which is adapted to the circular shape 8.
  • the laminated cores which form the central core stage, each provided with transverse to the layer plane cooling channels 4.
  • FIG. 4 shows a three-dimensional sectional view of the three-limb core wound from strip material.
  • the strip material is wound circumferentially to form the cooling channels 4 designed as described above, each in partial laminated cores 3, which respectively form corresponding legs 6 and yoke sections 7.
  • the cooling channels 4 of the core legs 6 are continued in the yokes 7 of the core.
  • FIG. 6 shows the full view of an embodiment of the active part of a three-phase transformer, which is provided with a cooling channels 43 provided with core 1. On the legs 6 windings 9 of the three-phase transformer are arranged in the embodiment.
  • the partial laminated core of the core 1 are formed in the embodiment of amorphous strip material.
  • FIG. 7 shows a sectional view of the in FIG. 6 shown embodiment in more detail.
  • the bending radii 17 of the mutually stacked laminated core 3 of a composite core 1 are each selected such that in the arc between leg 6 and yoke 7 each arcuate gap 23 and thus a cooling channel 43 is formed for the circulation of a cooling fluid.
  • FIG. 8 shows a section through the leg 6 of a further embodiment of a core 1, in which the partial laminated cores 3 of the metal sheets 2 are produced by means of a wound strip material.
  • the seven-stage core shown in the example uses only plates 11 of a single bandwidth to form the steps.
  • the lower yoke 7 of the core 1 is seen in full view.
  • the strip material is continuous, each comprising two legs 6 and the yokes 7, wound.
  • FIG. 9 shows the core 1 according to FIG. 8 in a three-dimensional view obliquely from the side.
  • FIG. 10 shows a sectional view through the axis of the central limb of another embodiment of a three-limb core parallel to the plane of the core band. Between the partial laminated cores 3 of the leg 6 vertical cooling channels 4 are arranged.
  • the winding radii 17 of the partial laminated core 3 of the core 1 are each chosen such that in the arc between leg 6 and yoke 7 each have a curved gap 23 is formed to form a cooling channel 43 for the circulation of the coolant.
  • This arcuate gap 23 is connected to the cooling channels 4 between the partial laminated cores 3.
  • the lower sheet for receiving the coolant which flows transversely to the winding direction, is distributed within the arc on the cooling channels 43 between the bands to then ascend by the heating and exit at the upper arc between leg 6 and yoke 7 again.
  • FIG. 11 shows a partial view of the leg-yoke transition of in FIG. 10 described embodiment in more detail.
  • FIG. 12 shows the front view of an embodiment with wound ribbon core of amorphous material, in which the laminations 2 are radially spaced from each other by means of inserts 48 such that a cooling channel 42 for supplying the cooling channels (not visible) is formed between the mutually parallel partial laminated cores.
  • FIG. 13 shows an embodiment of the center leg 6 of a three-phase transformer, each with a plurality of the center leg 6 with a neighboring leg magnetically coupling partial laminated cores. It can be seen in the region of the associated with the yoke 7 leg 6 radial cooling channels 42 between the partial laminated cores.
  • the mechanical Stabilizing clamping bands 52 are used, which include the partial laminated cores at the periphery. These can be arranged both transversely and longitudinally to the winding direction. In the embodiment according to FIG. 13 the arrangement is longitudinal, ie parallel to the winding direction.
  • the clamping bands 52 are preferably positioned in the transverse direction on the partial laminated cores in such a way that they are offset in their position relative to the clamping band of the adjacent partial laminated core and the space between the partial laminated cores forms a cooling channel.
  • FIG. 14 shows a three-dimensional view of the three-limb core according to FIG. 13 .
  • FIGS. 15 and 16 show an embodiment of a five-limb core.
  • the core is preferably formed from wound partial laminated cores of a strip material.
  • the three inner legs are provided for mounting windings, while the outer serve as a return leg.
  • the cores are made of wound segments of preferably amorphous strip material.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP14177246.7A 2014-07-16 2014-07-16 Noyau pour un dispositif d'induction électrique Active EP2975618B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP14177246.7A EP2975618B1 (fr) 2014-07-16 2014-07-16 Noyau pour un dispositif d'induction électrique
PCT/EP2015/065002 WO2016008727A1 (fr) 2014-07-16 2015-07-01 Noyau pour un appareil d'induction électrique
US15/326,886 US9941043B2 (en) 2014-07-16 2015-07-01 Core for an electrical induction device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14177246.7A EP2975618B1 (fr) 2014-07-16 2014-07-16 Noyau pour un dispositif d'induction électrique

Publications (2)

Publication Number Publication Date
EP2975618A1 true EP2975618A1 (fr) 2016-01-20
EP2975618B1 EP2975618B1 (fr) 2019-05-29

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EP14177246.7A Active EP2975618B1 (fr) 2014-07-16 2014-07-16 Noyau pour un dispositif d'induction électrique

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US (1) US9941043B2 (fr)
EP (1) EP2975618B1 (fr)
WO (1) WO2016008727A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3373311A1 (fr) * 2017-02-17 2018-09-12 Vysoké Ucení Technické V Brne Squelette pour noyau magnétique et procédé pour le fabriquer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020068346A (ja) * 2018-10-26 2020-04-30 三菱重工サーマルシステムズ株式会社 リアクタ及び室外機

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR573664A (fr) * 1923-02-22 1924-06-27 Alsacienne Constr Meca Procédé pour le refroidissement du circuit magnétique des appareils électriques et notamment des transformateurs
GB830688A (en) * 1955-04-13 1960-03-16 Gen Electric Improvements in laminated magnetic cores
US2991437A (en) * 1955-09-20 1961-07-04 Elin Ag Fur Elek Sche Ind Magnetic core
DE3505120C1 (de) 1985-02-14 1986-10-09 Hans O. Habermann Transformatoren -Elektroapparate, 7898 Lauchringen Transformator
EP2474985A1 (fr) 2010-12-27 2012-07-11 Hitachi Industrial Equipment Systems Co., Ltd. Transformateur amorphe
EP2704161A1 (fr) * 2012-08-31 2014-03-05 GE Energy Power Conversion Technology Ltd Noyau magnétique pour composant magnétique avec enroulement, contenant des support de refroidissement améliorés

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3157850A (en) * 1959-04-29 1964-11-17 Moloney Electric Company Magnetic cores
US3183461A (en) * 1962-02-05 1965-05-11 Westinghouse Electric Corp Magnetic core structure with cooling passages therein
US3967226A (en) * 1975-06-10 1976-06-29 Westinghouse Electric Corporation Electrical inductive apparatus having magnetic shielding cores and a gapped main core structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR573664A (fr) * 1923-02-22 1924-06-27 Alsacienne Constr Meca Procédé pour le refroidissement du circuit magnétique des appareils électriques et notamment des transformateurs
GB830688A (en) * 1955-04-13 1960-03-16 Gen Electric Improvements in laminated magnetic cores
US2991437A (en) * 1955-09-20 1961-07-04 Elin Ag Fur Elek Sche Ind Magnetic core
DE3505120C1 (de) 1985-02-14 1986-10-09 Hans O. Habermann Transformatoren -Elektroapparate, 7898 Lauchringen Transformator
EP2474985A1 (fr) 2010-12-27 2012-07-11 Hitachi Industrial Equipment Systems Co., Ltd. Transformateur amorphe
EP2704161A1 (fr) * 2012-08-31 2014-03-05 GE Energy Power Conversion Technology Ltd Noyau magnétique pour composant magnétique avec enroulement, contenant des support de refroidissement améliorés

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3373311A1 (fr) * 2017-02-17 2018-09-12 Vysoké Ucení Technické V Brne Squelette pour noyau magnétique et procédé pour le fabriquer

Also Published As

Publication number Publication date
WO2016008727A1 (fr) 2016-01-21
EP2975618B1 (fr) 2019-05-29
US9941043B2 (en) 2018-04-10
US20170213631A1 (en) 2017-07-27

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