EP3018664A1 - Noyau magnétique pour un dispositif d'induction électrique - Google Patents

Noyau magnétique pour un dispositif d'induction électrique Download PDF

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Publication number
EP3018664A1
EP3018664A1 EP14192071.0A EP14192071A EP3018664A1 EP 3018664 A1 EP3018664 A1 EP 3018664A1 EP 14192071 A EP14192071 A EP 14192071A EP 3018664 A1 EP3018664 A1 EP 3018664A1
Authority
EP
European Patent Office
Prior art keywords
yoke
leg
laminated
core
magnetic core
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
EP14192071.0A
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German (de)
English (en)
Other versions
EP3018664B1 (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 Energy Global GmbH and Co KG
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Siemens AG
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Filing date
Publication date
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Priority to EP14192071.0A priority Critical patent/EP3018664B1/fr
Publication of EP3018664A1 publication Critical patent/EP3018664A1/fr
Application granted granted Critical
Publication of EP3018664B1 publication Critical patent/EP3018664B1/fr
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    • 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
    • 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
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together

Definitions

  • the invention relates to a magnetic core for an electrical induction device with the features according to the preamble of patent claim 1.
  • three-phase transformers are known in which the iron core consists of lying in a plane legs and upper and lower yoke bars that connect the legs. The legs are enclosed by windings which are insulated from each other and from ground. In order to easily control the radial winding forces occurring in the event of a short circuit, windings with circular coils are preferred for power transformers of the type described, which windings are placed on the legs of the transformer core.
  • the cross section of the limbs is usually carried out in a circular manner with a multi-stepped edge.
  • the staging of the leg is usually continued in the yoke to obtain the same cross section for each stage over the entire magnetic circuit and to ensure a trouble-free magnetic flux.
  • the object of the invention is to achieve a magnetic flux improved in the case of stepped magnetic cores compared with the prior art.
  • the invention provides that at least one of the legs of the magnetic core carries a winding and this leg carrying the winding is circular in cross-section with a stepped outer edge and the centers of the laminated cores of this leg lie on a straight line and at least one of these legs adjacent laminated yokes, the laminated cores are aligned such that the laminated core centers of outer laminated cores are offset from the laminated core center middle laminations in the direction of this leg to form a Jochquer songs resonance in which the geometric centroid is shifted relative to the laminated center of the middle laminated cores in the direction of this leg.
  • a significant advantage of the magnetic core according to the invention is the fact that it due to the inventively provided grading the laminated cores at the or the yokes or by the inventive departure from a circular Jochquerrough at the leg interface to a step by step reduced magnetic path (compared with conventional magnetic cores with a circular yoke cross-section) and consequently the required core sheet material can be reduced and reduced in weight.
  • the reduction of the core sheet material leads advantageously to a reduction in the Ummagnetmaschineswe. It is also possible to avoid steps in the area of the yoke edge facing the limb, so that the number of electrical peaks occurring (compared to conventional magnetic cores) can be reduced.
  • the laminated core centers of the outer laminated cores are offset in the direction of the leg such that the laminated core centers of outer laminated cores are closer to the leg than the laminated core centers of middle laminated cores.
  • the laminated cores of at least one of the yokes are aligned such that - viewed in cross-section and transverse to the stacking direction of the sheets - the centers of the laminated cores lie on a curvilinear curve which is axially symmetrical with respect to the center of the middle laminated core or the middle laminated cores.
  • the laminated cores form a straight yoke edge at the interface to the leg.
  • the laminated cores of the yoke and legs are in pairs opposite the front edge side.
  • the step height of the step corresponds in each case to twice the step height of the step, which have the end edge side opposite laminations of the leg.
  • the grading on the side facing away from the leg corresponds to twice the offset of the laminated core in the yoke or if the gradation in the region of the yoke corresponds to twice the grading in the region of the leg.
  • the yoke and leg plates preferably each have the same width for each stage.
  • the cross-sectional areas of yoke and leg are preferably the same size.
  • each laminated core of the yoke is preferably in each case just as large as the laminated core height of the front edge side opposite laminated core of the leg.
  • the laminated cores are preferably pressed together by means of a pressing device having at least two pressing units, of which at least a press unit, preferably the or a leg-near press unit, compresses all laminated cores of the yoke and of which at least one press unit, preferably the or a leg-distant press unit, compresses only a subset of the laminated core of the yoke.
  • a press unit preferably the or a leg-near press unit
  • at least one press unit preferably the or a leg-distant press unit
  • At least one of the press units of the yoke on clamping bands for transmitting the pressing force.
  • At least one of the press units has press studs which press on the yoke two outside pressing elements which are located on the outside of the yoke and face one another, for example in the form of press beams.
  • each of a portion of the yoke height pressing press units are provided with their own the press force longitudinally distributed in the yoke direction pressing bars.
  • the pressing beam opposite the leg are directly connected to the winding support or the winding tensioning device.
  • the press beams of the leg-distant yoke press unit are preferably spatially and non-positively separated from the winding support and winding tensioning device.
  • a pressing unit of at least one yoke is provided with longitudinally disposed of the yoke pressing beam and if these pressing bars are each made of a metallic material and are at least partially provided on the opposite side of the winding with an electrical shield forming round end surface.
  • the distance between the round end surface and the winding edge the winding is preferably equal to or smaller than the distance of the yoke edge to the winding.
  • At least one support element is provided for the axial strain of a winding located on the leg, which is at least partially bevelled in the yoke, and the offset of the centers of the outer laminated core of the yoke is designed such that the gradation the yoke follows the contour of the bevel of the support element.
  • the laminated cores of the yoke located under the winding are preferably shifted relative to the middle of the middle laminated core of the yoke, that the yoke edge forms a line on the side facing the leg and the winding support for supporting the winding is at least partially supported directly on this yoke edge.
  • the FIG. 1 shows a portion of a magnetic core 1 for an electric induction device.
  • the magnetic core 1 comprises an upper yoke 3, a lower yoke 4 and a leg 2 concealed by a winding 10 of the induction device, which is arranged between the upper yoke 3 and the lower yoke 4.
  • the winding 10 of the induction device is placed on the leg 2.
  • the upper yoke 3 is formed by laminated cores 31, which are pressed against each other by means of a pressing device 9.
  • the pressing device 9 comprises a lower pressing unit 91, which is arranged adjacent to the leg 2, as well as an upper Press unit 92, which is spatially separated from the leg 2 by the pressing unit 91.
  • the two press units 91 and 92 comprise in the embodiment according to FIG. 1 two press beams 93, which means by in the FIG. 1 Unillustrated billets are compressed.
  • the laminated cores 31 of the upper yoke 3 are in the magnetic core 1 according to FIG. 1 aligned in such a way that the laminated core centers on the outside of the laminated core are offset relative to the middle of the laminated core in the direction of the arm 2 in the direction of the arm 2, in which the geometrical center of gravity FP is displaced in the direction of the arm 2 relative to the center of the armature core M of the middle laminations.
  • a winding tensioning device 11 which comprises two supporting elements 110 and 111.
  • the two support elements 110 and 111 have in the direction of the leg center of the leg 2 and the middle of the yoke of the upper yoke 3 each have a sloping edge 112, at the course of the lower yoke edge 32 of the upper yoke 3 is adjusted.
  • the offset of the laminated cores 31 and the gradation of the laminated cores 31 as in FIG. 1 shown in Jochrand Scheme selected accordingly.
  • FIG. 1 moreover, shows the configuration of the lower yoke 4 in more detail. It can be seen that that lower yoke 4 is formed by laminated cores 41, which are pressed together by means of a pressing device 9.
  • the pressing device 9 comprises an upper pressing unit 91, which is arranged adjacent to the leg 2, and a pressing unit 92 arranged at a distance from the leg 2.
  • the two press units 91 and 92 each have opposing press bars 93, which are pressed together by means not shown pressing bolts.
  • the laminated cores 41 are aligned at the lower yoke 4 such that the laminated core centers of the outer laminated cores are offset from the middle of the laminated core middle laminations in the direction of the leg 2 to form a Jochquerroughs Solution, in which the geometric centroid FP relative to the center M of the middle laminated cores in the direction of Schenkels 2 is moved.
  • the offset of the laminated cores 41 is also chosen such that at the interface to the leg 2 a straight yoke edge 42 is formed on which a winding support 12, which carries the winding 10, rests.
  • the yoke edge of the lower yoke 4 facing the limb 2 is preferably rectilinear, whereas the lower yoke edge 32 of the upper yoke 3 is preferably non-linear with a view to adapting the yoke edge to the support elements 110 and 111.
  • an insulating arrangement 101 is preferably provided in each case.
  • FIG. 2 shows the cross section of the leg 2 of the magnetic core 1 according to FIG. 1 in cross section. It can be seen that the leg 2 is formed from a plurality of laminated cores 21. In cross section, the leg 2 is circular with a stepped outer edge. The centers of the laminated cores of the leg 2 lie on a straight line 22.
  • FIG. 3 shows in cross section a further embodiment of an upper yoke 3, which in the magnetic core 1 according to FIG. 1 can be used. It can be seen that the centers of the laminated cores 31 lie on a curvilinear curve 36, which is preferably axisymmetric with respect to the middle of the yoke of the upper yoke 3. In addition, the leaves FIG. 3 recognize that the centroid FP of the upper yoke 3 is shifted in the direction of the lower yoke edge 32 with respect to the laminated core center M of the middle laminations.
  • FIG. 4 again shows the lower yoke of the magnetic core 1 according to FIG. 1 in cross section. It can be seen that the laminated core centers of the laminated cores 41 of the lower yoke 4 lie on a curvilinear curve 46, which is preferably axially symmetrical with respect to the center of the middle laminated core of the lower yoke 4.
  • Figure 4 shows the offset of the centroid FP with respect to the laminated core center M of the middle laminated core of the lower yoke 4; It can be seen that the centroid FP in the direction of the to the winding support 12 (see. FIG. 1 ) adjacent Jochkante 42 is shifted.
  • FIG. 5 shows an embodiment of a three-legged magnetic core 1 for an electrical induction device, which has three windings 10 in addition to the magnetic core 1.
  • Each of the windings 10 is in each case placed on a leg 2 of the three-arm magnetic core 1.
  • the FIG. 5 moreover shows pressing bolt 94, which serve for pressing the laminated cores of the upper yoke 3 and the lower yoke 4.
  • the press studs 94 preferably form components of press units, such as those in the press units 91 and 92, respectively FIG. 1 of which at least one preferably does not cover the entire layer thickness of the respective yoke and of which at least one other preferably comprises the entire layer thickness of the respective yoke.
  • a segmentation of the respective yoke in a leg-proximal portion 3a and 4a and a leg distant portion 3b and 4b may be provided, as indicated by lines L in the FIG. 5 is indicated.
  • FIG. 6 shows the compression of the laminated cores at the upper yoke 3 of the magnetic core 1 according to FIG. 5 exemplary closer in detail.
  • a pressing device 9 which comprises a pressing unit 91 and a pressing unit 92.
  • the pressing unit 91 has two opposing pressing bars 93, pressing pins 94 and two pressing inserts 95.
  • the function of the Pressbeilageieri 95 is to ensure a uniform contact pressure on Blechunprocessn away.
  • the pressing unit 91 serves to compress all laminated cores of the yoke.
  • the pressing unit 92 also has two pressing bars 93, pressing pins 94 and two pressing inserts 95. In contrast to the pressing unit 91, the pressing unit 92 presses together only a subset of the laminated core of the yoke.
  • FIG. 7 shows the two pressing devices 91 and 92 according to FIG. 6 closer in detail in a three-dimensional representation obliquely from the side.
  • FIG. 8 shows a preferred, modified embodiment for the pressing unit 91, which is immediately adjacent to the winding 10.
  • the pressing bars 93 of the pressing unit 91 are each provided with an electrical shield 96 in the region of their lower beam edges opposite the winding 10.
  • the electrical shield preferably has a round end surface in cross section, whose distance from the winding edge of the Winding 10 is equal to or smaller than the distance of the lower Jochkante 32 of the yoke 3 of the winding 10.
  • the pressing beam 93 and the electrical shield 96 are preferably made of metallic material.
  • the yoke edge 32 facing the winding 10 is shielded by the electrical shield 96 integrated in the press unit 91.
  • the pressing unit 91 is preferably extended downwards so that a projection to the yoke edge 32 is formed, and it is preferably a rounding of the pressing unit 91 in the region of this overlap.
  • FIG. 9 shows an embodiment of a three-legged magnetic core 1 for an induction device, which is equipped with three windings 10. It can be seen that the three legs 2 of the magnetic core 1 are interconnected by means of an upper yoke 3 and a lower yoke 4.
  • clamping bands 200 for example in the form of bandages, provided which can be passed through holes or slots in the respective yoke.
  • segmentation of the respective yoke may be provided in a leg-proximal portion and a leg-distal portion such that each of the tension bands 200 braces either the leg-distal or thigh-proximal segment.
  • FIG. 5 With regard to the segmentation into a leg - distant or thigh - related segment, reference should be made to the explanations in connection with FIG. 5 referenced, which apply analogously here.
  • FIG. 10 shows in a cross section an embodiment for the bracing of the upper yoke 3 and the lower yoke 4, respectively FIG. 9 closer in detail.
  • the two press units 91 and 92 each have a clamping band 200, which serves to clamp the laminated cores of the respective yoke segment.
  • the two press units 91 and 92 preferably also press-insert elements 95, as already in connection with the FIGS. 6 and 7 have been explained.
  • the laminations of the yoke may be segmented into one or more legs remote and in one or more leg-proximal segments;
  • the leg near press unit 91 may compress the leg near segment of the yoke and the leg distal press unit 92, the leg distant segment of the yoke.
  • the yoke may be provided with holes through which the tension bands 200 are pulled.
  • the tension bands (200) of the leg-near press unit (91) and the tension bands of the leg-distant press unit (92) are arranged offset in the direction of the yoke axis.
  • the clamping bands of the leg-near pressing unit and the clamping bands of the leg-distant pressing unit can each use the same gap between the yoke segments.
  • the number of tension bands (200) of the leg-distant press unit (92) can be increased in relation to the number of tension bands of the leg-near press unit (91) in order to achieve a favorable distribution of the pressing forces on the yoke.
  • FIG. 11 shows the two pressing devices 91 and 92 with the tension bands 200 according to FIG. 10 in the upper yoke 3 in a three-dimensional representation closer in detail.
  • FIG. 12 shows an embodiment in which the laminated cores 31 of the yoke 3 at least partially not the same sheet metal width as the associated laminated core of the leg 2.
  • the design of the laminated cores of the leg takes place as in the aforementioned examples such that a circular shape approximated leg 2 is formed. This is enclosed by the winding 10.
  • the yoke 3 has a number of core stages reduced in relation to the leg.
  • Several laminated cores 31 of the yoke have a same sheet width.
  • the adaptation of the cross sections of leg and yoke takes place in the exemplary embodiment laminated core.
  • a reduction of the core height, as well as a simplification of the press units is possible.
  • the laminated cores form in this embodiment at the cutting edge to the leg a straight yoke edge 32nd
  • the pressing of the yoke is subdivided into several pressing regions, which are clamped by separate pressing units (91, 92).
  • the leg-facing pressing devices 91 of the yoke 3 are connected to each other by parallel to the leg axis extending tension members 98 for winding tension.
  • these tension elements 98 can be formed by tie rods located outside the winding, by tie rods lying on the leg within the winding or by plastic pull elements running within the core or the winding.
  • the fastening elements 99 for lifting the active part are each connected only to the pressing unit 91 of a portion of the yoke.
  • the leg-distant press units 92 preferably have no connection to the winding tensioning devices, the winding supports and the tensile elements 98 for winding tensioning and the fastening elements 99 for lifting the active part. The force effects of these functions must therefore not be taken into account in the dimensioning of the leg-distant pressing devices 92.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP14192071.0A 2014-11-06 2014-11-06 Noyau magnétique pour un dispositif d'induction électrique Active EP3018664B1 (fr)

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Application Number Priority Date Filing Date Title
EP14192071.0A EP3018664B1 (fr) 2014-11-06 2014-11-06 Noyau magnétique pour un dispositif d'induction électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14192071.0A EP3018664B1 (fr) 2014-11-06 2014-11-06 Noyau magnétique pour un dispositif d'induction électrique

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EP3018664A1 true EP3018664A1 (fr) 2016-05-11
EP3018664B1 EP3018664B1 (fr) 2020-06-17

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017223839A1 (de) * 2017-12-28 2019-07-04 Siemens Aktiengesellschaft Magnetkern mit Rückschlussschenkel
WO2020093589A1 (fr) * 2018-11-09 2020-05-14 王永法 Noyau stratifié de transformateur et son procédé de préparation

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB673210A (en) * 1950-02-13 1952-06-04 British Thomson Houston Co Ltd Laminated magnetic cores having improved cooling means
CH341896A (de) * 1955-12-30 1959-10-31 Oerlikon Maschf Geschachtelter Eisenkörper für Transformatoren
GB1094442A (en) * 1964-03-02 1967-12-13 English Electric Co Ltd Laminated magnetic cores for inductive apparatus
DE2324644A1 (de) * 1973-05-16 1974-12-05 Schorsch Gmbh Schichtkern mit wicklungspresskonstruktion und auf schenkeln des kerns angeordneten wicklungen fuer transformatoren oder drosselspulen
JPS5230911U (fr) * 1975-08-27 1977-03-04
US4140987A (en) * 1975-12-12 1979-02-20 Hitachi, Ltd. Core of a core-type transformer
WO2011133391A2 (fr) * 2010-04-22 2011-10-27 Abb Technology Ag Transformateur doté d'un noyau empilé

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB673210A (en) * 1950-02-13 1952-06-04 British Thomson Houston Co Ltd Laminated magnetic cores having improved cooling means
CH341896A (de) * 1955-12-30 1959-10-31 Oerlikon Maschf Geschachtelter Eisenkörper für Transformatoren
GB1094442A (en) * 1964-03-02 1967-12-13 English Electric Co Ltd Laminated magnetic cores for inductive apparatus
DE2324644A1 (de) * 1973-05-16 1974-12-05 Schorsch Gmbh Schichtkern mit wicklungspresskonstruktion und auf schenkeln des kerns angeordneten wicklungen fuer transformatoren oder drosselspulen
JPS5230911U (fr) * 1975-08-27 1977-03-04
US4140987A (en) * 1975-12-12 1979-02-20 Hitachi, Ltd. Core of a core-type transformer
WO2011133391A2 (fr) * 2010-04-22 2011-10-27 Abb Technology Ag Transformateur doté d'un noyau empilé

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017223839A1 (de) * 2017-12-28 2019-07-04 Siemens Aktiengesellschaft Magnetkern mit Rückschlussschenkel
WO2019129491A1 (fr) * 2017-12-28 2019-07-04 Siemens Aktiengesellschaft Noyau magnétique avec branche de retour
WO2020093589A1 (fr) * 2018-11-09 2020-05-14 王永法 Noyau stratifié de transformateur et son procédé de préparation

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