WO2001065572A2 - Noyau de transformateur - Google Patents

Noyau de transformateur Download PDF

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Publication number
WO2001065572A2
WO2001065572A2 PCT/SE2001/000454 SE0100454W WO0165572A2 WO 2001065572 A2 WO2001065572 A2 WO 2001065572A2 SE 0100454 W SE0100454 W SE 0100454W WO 0165572 A2 WO0165572 A2 WO 0165572A2
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WO
WIPO (PCT)
Prior art keywords
core
leg
cross
ring
transformer
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Application number
PCT/SE2001/000454
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English (en)
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WO2001065572A3 (fr
Inventor
Lennart Höglund
Original Assignee
Hoeglund Lennart
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26655007&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2001065572(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from US09/623,285 external-priority patent/US6683524B1/en
Priority claimed from SE0000710A external-priority patent/SE517941C2/sv
Application filed by Hoeglund Lennart filed Critical Hoeglund Lennart
Priority to AT01914262T priority Critical patent/ATE465501T1/de
Priority to EP01914262.9A priority patent/EP1277217B2/fr
Priority to DE60141897T priority patent/DE60141897D1/de
Priority to AU2001239609A priority patent/AU2001239609A1/en
Publication of WO2001065572A2 publication Critical patent/WO2001065572A2/fr
Publication of WO2001065572A3 publication Critical patent/WO2001065572A3/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
    • H01F27/24—Magnetic cores
    • H01F27/25—Magnetic cores made from strips or ribbons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers

Definitions

  • the present invention relates generally to transformer cores and especially to three-phase cores comprising multi-edged legs.
  • the invention also relates to single-phase shell cores having many rings, frame cores having two frames and two yokes, inductors, and components for the foregoing and transformers.
  • Three-phase transformer cores are usually made of transformer plates cut to E I shape for small transformers and to rectangular plates, which are laid edge to edge, in larger transformers. They have the draw- back that the magnetic field has to pass via edges from plate to plate and that the magnetic field must go an unnecessarily long way and not always along a magnetic orientation.
  • Strip cores for three-phase transformers have hitherto been difficult to manufacture.
  • the efficiency of the core can be increased by cutting strips to variable width and winding rings, which are given a circular cross-section for single-phase transformers and semi- circular cross-section for three-phase transformers. This method results in a great deal of waste and the winding process is time consuming.
  • US 4,557,039 discloses a method of manu- facturing transformer cores using electrical steel strips having approximately a linear taper. By selecting a suitable taper, a hexagonal or higher order approximation of a circular cross section for the legs of the cores is produced. However, the tapered strips are difficult and time-consuming to produce and the design is not well adapted to large-scale production.
  • a prior art three-phase transformer core according to Manderson, generally designated 10.
  • the core has a general cage-shape, as is seen in the isometric view of fig. 1, with three legs interconnected by yoke parts.
  • fig. la a cross-sectional view of the core is shown before final assembly.
  • the core comprises tree identical ring- shaped parts or frames 12, 13, and 14, the general shape of which appears from fig. 1.
  • Each frame fills up one half of two legs with hexagonal cross-sections, see fig. la, thus totalling the three legs of a three- phase transformer.
  • the frames are initially wound from constant width strips to three identical rings 12a, 13a, 14a with rhombic cross-sections comprising two angles of 60° and two angles of 120°. These rings 12a- 14a constitute the basic rings. The orientation of the strips also appears from figs, la and lb.
  • each frame there is an outer ring 12b, 13b, 14b of a regular triangular cross-section.
  • the outer rings are wound from strips with constantly decreasing width.
  • Transformer cores are also described in the following documents: SE 163797, US 2,458,112, US 2,498,747, US 2,400,184 and US 2,544,871. However, the above men- tioned problems are not overcome by the cores described in these documents.
  • An object is to provide a transformer core, which is easy to manufacture and avoids material waste.
  • Another object of the present invention is to provide a transformer core wherein the energy losses are minimised.
  • Another object is to provide a method of manufacturing a transformer that is well adapted for large-scale production.
  • the invention is based on the realisation that a transformer core with one or more multi-edged legs with more than four edges can be assembled from rings of strips with constant width.
  • a transformer core as defined in claim 1.
  • the invention provides a transformer core with good magnetic properties that is easy to manufacture.
  • fig. 1 is an isometric view of a prior art three-phase transformer core made of rings with rhombic and triangular cross-sections;
  • figs, la and lb are transverse cross-sections of the core shown in fig. 1 before and after assembly, respectively;
  • fig. 2 is an isometric view of a three-phase transformer core according to the invention with legs with hexagonal cross-sections; figs. 2a and 2b are transverse cross-sections of the core shown in fig. 2 before and after assembly, respectively;
  • fig. 3 is an isometric view of an alternative embodi- ment of a three-phase transformer core according to the invention with legs with hexagonal cross-sections;
  • figs. 3a and 3b are transverse cross-sections of the core shown in fig. 3 before and after assembly, respectively;
  • Fig. 3c is an isometric view of one of the frames of the transformer core shown in Fig. 3;
  • Fig. 3d is an exploded view of the frame shown in Fig. 3c;
  • Fig. 3e is a cut away isometric view of the frame shown in Fig. 3c;
  • Fig. 3f is a cross-sectional view of the frame shown in Fig. 3c;
  • Fig. 4 is an isometric view of a three-phase transformer core with octagonal legs
  • Fig. 4a is a transverse cross-section of the core shown in fig. 4;
  • Fig. 5 is a cross-section of a transformer leg with ten edges
  • Fig. 6 is a cross-section of a transformer leg with twelve edges;
  • Figs. 7-9 show an arrangement for influencing the leakage inductance and the harmonics in a three-phase transformer;
  • Fig. 10 is a transverse cross-section of a three-phase transformer core with specially shaped yoke parts for improving the magnetic flux;
  • Fig. 11 and 11a show a three-phase transformer core with lined up legs
  • Figs. 12-14 show single-phase transformer cores according to the invention
  • Figs. 15-17 show further improvements of the shape of the transformer core cross-section
  • Figs. 18-21 show alternative embodiments of a three- phase core with alternatively shaped legs and yokes
  • Fig. 22 is a top view of an alternative embodiment of the invention showing a three-phase transformer core with rings added to increase the flux in the legs and help in cooling the core;
  • Fig. 23 is a plan view of another transformer core according to the invention.
  • Fig. 23a is cross-sectional view of the core shown in Fig. 23, also including in exploded form the respective frames, and in a second exploded view showing each of the combined legs;
  • Fig. 24 is a single-phase transformer core with ten sides in cross-section according to the invention
  • Fig. 25 is a single-phase transformer core derived from the core in Fig. 24 with ten sides in cross- section according to the invention constructed for improved cooling;
  • Fig. 26 is an inductor core according to another embodiment of the invention, shown in isometric form
  • Fig. 27 is an alternative leg for the inductor core shown in Fig. 26;
  • Figs. 28a-28w are cross-sectional views of various transformer or inductor legs according to the invention.
  • Fig. 29 is a schematic view of a transformer or inductor according to the invention.
  • Fig. 1 has already been discussed in connection with prior art and will not be explained further.
  • a three-phase transformer core according to the invention In its general shape it is similar to the prior art transformer core shown in fig. 1 with a general cage-shape but that is designed in an entirely different way.
  • the core is made up of three ring-shaped parts or frames 22, 23, 24 comprising several rings. These come in two widths, broad or narrow wherein the narrow rings are made up of strips of half the width of the broad rings. Also, they come in two thicknesses, thin or thick wherein the thin rings have half the thickness of the thick rings. Unless otherwise stated, these definitions will be used throughout this description.
  • the strips are preferably made of transformer plate.
  • Each of the frames 22-24 comprises a broad thick basic ring 22a-24a, respectively, similar to those described with reference to fig. 1.
  • these rings form in pairs four of the sides in the hexagonal legs.
  • the remaining rhombs in the legs are built in different ways, see figs. 2a and 2b.
  • the additional rhombic cross-section is composed of two rhomboids.
  • the first one, designated 24b and belonging to frame 24, is a broad thin ring.
  • the second one, designated 22b and belonging to frame 22, is a narrow thick ring.
  • the addi- tional rhombic cross-section is composed of one rhomboid and two rhombs.
  • the rhomboid is filled by the narrow thick ring 22b belonging to the frame 22.
  • the rhombs are filled by two narrow thin rings 23b, 23c belonging to the frame 23.
  • the additional rhombic cross-section is also composed of one rhomboid and two rhombs.
  • the rhomboid is filled by the broad thin ring 24b belonging to the frame 24.
  • the rhombs are filled by two narrow thin rings 23b, 23c belonging to the frame 23.
  • the reason that the frame 23 comprises two thin narrow rings instead of one larger ring is that this larger ring can not be both narrow and thick, as required in the left leg 27, and broad and thin, as required in the right leg 26. Thus, instead two narrow thin rings are used.
  • All upper or lower yokes connecting the legs 25-27 have different shapes but all are built from one basic ring with a large rhombic cross-section plus one ring with a rhomboidal cross-section or two rings with a small rhombic cross-section. This gives all yokes the same total cross-section area.
  • FIG. 3 a three-phase transformer core 30 is shown.
  • Core 30 has frames 32, 33, 34.
  • Each frame has vertically extending portions that run between opposite ends of a pair of opposed yokes.
  • the legs of each frame cooperate with legs of adjacent frames to form legs 35, 36 and 37 of transformer core 30. Since each frame is identical to the other frames, only frame 32 will be discussed.
  • Frame 32 has a broad, thick ring 32a, a narrow thin ring, 32b which goes over ring 32a, and a narrow thin ring 32c which goes partly over ring 32b and partly over 32a.
  • Ring 32 is shown alone in Fig. 3c.
  • Fig. 3c is a view of frame 32a from inside core 30. It can be seen in Fig. 3c that broad, thick ring 32a is lying in one plane, that ring 32b has an edge lying on the forward edge of ring 32a as viewed on the right portion of Fig. 3c, but is located so that the left edge of ring 32b is sitting near the rear edge of ring 32a.
  • Ring 32c has its left hand surface flush against the right hand surface of ring 32b, and then is arranged so that it crosses over ring 32b and that its bottom strip is aligned with the top strip of ring 32b.
  • Frame 32 is shown in exploded form in Fig. 3d. It can again be seen that broad thick ring 32a is a wound ring, with its layers being displaced so that its innermost strip in the profile extends forwardly, out of the plane of the paper. Narrow thin ring 32c has its layers displaced inwardly, towards the plane of the paper, that is, opposite to the direction of the offset of ring 32a, as noted above. Ring 32b is narrow and thin, and the direction of the offset of its layers is the same as that of ring 32c.
  • Fig. 3e shows a portion of frame 32 in cross-section. Ring 32a is at the innermost part of frame 32, ring 32b is close to the forward edge of ring 32a when viewed in the right hand corner of Fig.
  • thin ring 32c is rearward of ring 32b as shown in Fig. 3e, but is wound around and sits on ring 32b as can be seen in the left hand portion of frame 32.
  • FIG. 3f is a top cross sectional view of frame 32 in Fig. 3c. It shows broad thick ring 32a, narrow thin ring 32b, and narrow thin ring 32c. The offsetting or splaying of the rings 32a, b and c is clear from this view. Rings 32b and 32c are higher in the foreground and lower in the background.
  • the dimension "w” shows the width of ring 32a, and the width of rings 32b and 32c are "w/2".
  • the thickness of ring 32a is shown as "t” and the thickness of each of rings 32b and 32c are "t/2".
  • a further possibility is to make broad thin rings and turn the leg parts 60°, forcing a corresponding bending of the yoke parts.
  • the yoke parts then require more space and the bending is not so easy to effect.
  • Making narrow thick rings and turning and bending as mentioned is also possible, but difficult. Additional variants, including those with smaller divisions, are also possible.
  • a core with octagonal legs, generally designated 40, will now be described with reference to figs. 4 and 4a.
  • the sides turn 45°, which means that they have a relative angle of 135° to each other.
  • Three rhombs, each with an angle of 45°, thus get space in the inner- most edges of the legs of the core. Outside of these rhombs, two squares are filled by rings with quadratic cross-sections. Finally, a rhomb fills the rest of the octagonal cross-section of the leg.
  • the three profiled rings all contain two rings with equal leg parts.
  • a first ring 42a, 43a, 44a has a rhombic cross-section and the yoke parts bent 15°.
  • a second ring 42b, 43b, 44b outside of the first ring is quadratic and follows the form of the first ring 42a- 44a.
  • two outer rhombs compose the cross-section of an outer ring with the yoke parts bent 15°.
  • two inner rhombs compose an inner ring but bent 60°.
  • the next ring must now give an outer rhomb in one leg and an inner rhomb in the other leg and be bent 30°.
  • One type of profiled ring is to be preferred because it is difficult to bend a ring 60° and one can not avoid a ring with both an outer rhomb and an inner rhomb.
  • the third ring 42c has a rhombic cross- section in the leg parts and is placed outermost in the back leg 45 but inside the right leg 46. These rhombs of the leg parts are obtained by displacing the outer strips of the ring to the right at the right leg 46 and to the left at the back leg 45. Furthermore, the legs are turned asymmetrically 30° and the yoke parts are bent accordingly. The ring is given such a circumference that it will lie outside of the other rings. The final result appears in fig. 4.
  • a 10-sided leg, generally designated 50, will now be described with reference to fig. 5.
  • the profiled rings contain all four rings with equal leg parts.
  • a first ring 50a, a second ring 50b and a third ring 50c with rhombic cross-sections in their leg parts are attached to the 10-sided cross-section. Thus they have the angles 36, 72, and 108° and their yoke parts bent 24°.
  • a fourth ring 50d having a rhomboid cross-section with the angle 36° lies mainly upon the first ring 50a. Its leg parts are turned outwards 24°, causing a 48° bending of its yokes .
  • the fourth ring also causes the yoke parts of the third ring 50c to make a larger bow to give space.
  • a fifth ring 50e has a rhombic cross- section in its leg parts with the angle 144° when it lies outside of the third ring 50c, but the ring has a rhombic cross-section with the angle 72° when it lies outside of the fourth ring 50d.
  • the yokes are bent only 12°.
  • the arrows i the figure indicate that the cross-sections 50e belong to different profiled rings.
  • the channel is filled with a ring. This is an advantage when the rings co-operate by letting the magnetic field go between them.
  • the space can e.g.
  • Fig. 6 shows a 12-sided core, generally designated 60.
  • the profiled rings are composed of four rings 60a-d with rhombic cross- sections with the angles 30, 60, 90, and 120°, which are attached to the 12-sided cross-section and are turned 15°. Inside of these rings there are two rings 60e, 60f with rhombic cross-sections with the angles 30 and 60°, respectively, and turned outward 15°. Attached to the fifth and sixth rings 60e, 60f there is space for a ring 60g with a rhombic cross-section with the angle 30° turned outward 45°. Its other leg part is a rectangle outside of the sixth ring 60f and turned outward 15°.
  • the good properties of these transformer cores can be made even better for some transformer application, see fig. 7.
  • the leakage inductance can easily be increased by an additional core 29 of strips between the primary and secondary windings of the transformer. The strips are brought together at the top and bottom. The strips can be spread around the entire primary winding or be concentrated to one place, making the secondary winding eccentric.
  • the centre leg is made of three rectangular poles 80 from strips given a thickness three times the width, laid on each other to a quadratic cross-section, see fig. 8.
  • This is preferably triangular and a custom-made solution contains poles with a rhombic cross-section, of which three are put together to form a packet with the strip edges toward each other in a wave form, see fig. 9.
  • Three packets are put together with small distances to form a leg with a cross-section approximating a triangle.
  • the ends of the poles are bent outward to reach the yokes.
  • spacers between the poles are necessary.
  • the spacers do not influence the magnetic properties because one pole from each packet 91a-c; 92a-c; 93a-c is bent to each yoke.
  • the strips are, at least on one side, parallel to the spacers .
  • a rod, wound of strips in spiral form or as coils, is useful, especially if there are to be air gaps between the centre leg and the yokes .
  • the spiral can be made wider at the ends to reduce the air gaps to the yokes.
  • the flexibility of building cores like this is good and s shown m fig. 10.
  • the figure shows the core de- scribed in connection with fig. 4.
  • a major part of the magnetic flux can pass from one profiled ring to another in the legs where they are touching each other. This enables the rotation of larger fluxes in the yoke triangle.
  • Fig. 11a shows the transverse cross-section of a transformer with octagonal legs. All legs comprise four rhombs with an angle of 45° and two squares. Rings running between adjacent legs are shown in the figure while those running between the outer legs are almost entirely hidden.
  • the leg parts In order to make transformer cores of this kind, the leg parts must be bendable and that the yoke parts can be bent and pass each other. There are several solutions, of which one is shown in the figure.
  • the leg parts of the rings are bent outward and the yoke part inward or vice versa.
  • the shape of the yoke parts is limited by the limited possibilities of plastic defor- mations but otherwise the yoke parts can have any shape.
  • the principle shown in fig. 11 is to have sharp bends and straight yoke parts.
  • the rings can also be placed on each other giving rounded bends in order to save material.
  • 116 are built up of a ring 112a with a rhombic cross- section in the leg part, a ring 112b with a square cross-section and both bent 22.5° and a rhombic ring 112c turned 67.5° in the leg parts.
  • the rings 112a and 112b fit into the octahedrons close to the yoke side while the ring 112c fits into the opposing side.
  • 117 can only be placed in the centre leg in the re- maining positions: 114a-c.
  • the cross-sections of the left and right legs 115, 117 are mirror images to the centre leg 116 so that the rings running in the centre leg are symmetric.
  • the inner rings 114a, 114b have their closest positions in the right leg 117.
  • the ring 114c with a square cross-section in the leg parts runs to the closest square-shaped position in the right leg. The reason behind that is that the ring 113a with a square cross-section between the outer legs is in an outer position on the yoke parts already present in order to reach the left leg.
  • a heavily sloping fold is used instead. This is shown for the ring 114c having the shortest yoke. The fold starts at one end of the yoke and ends at the other end, marked by 118a for the lower yoke and 118b for the upper yoke in fig. 11. Also, the yokes can be subdivided into several narrow rings .
  • Fig. 12 shows a transformer with an octagonal cross-section composed of rings with the same cross-sections as in the three-phase transformers but with the return loops going the closest way outside of the windings.
  • the rings can be transposed and yet given an octagonal cross-section.
  • a small reduction of the amount of plate can e.g. be obtained by looping up to the left of the ring looping rightmost in the figure. There must its cross-section be changed to a rhombic form close to rectangular form.
  • a core with two legs can be made from the three-phase designs by bending the rings from one leg together to form only one more leg.
  • a core is shown in fig. 13 with an octagonal cross-section in its legs. The turn- ing of three leg-parts is 45° and the bending is 90°.
  • a ring with a rectangular cross-section and the two rings outside of that ring are not deformed.
  • Cores with hexagonal legs need only three rings made of strips with the same width.
  • the single phase transformers described herein also can have a cross-sectional shape deviating from a perfect regular polygon, like the three-phase cores described below with reference to figures 18-21.
  • the segments outside of a polygonal leg can be filled by a thin rhombic ring of a strip with about half the width and the full thickness of the segment and wound to its total width. Folds in the strips along the middle of the rhomb as in fig. 15 make two sides to one flat side giving a triangle, the sides of which are in contact with the core. With about 2/3 width and 8/9 thickness, a fold at the edge of the innermost strip makes a trapezoid cross-section as in fig. 16. The cross-section can also be rounded.
  • the leg parts can be given a cross-section shape closer to the shape of a circle, see fig. 17, 17a and 17b.
  • the right leg 172 in fig. 17 will be described as an example with reference to fig. 17a, wherein a transverse cross-section of that leg is shown.
  • rings 173 of e.g. 80% of full width and to a thickness of 9% of its width.
  • rings 173 e.g. 80% of full width and to a thickness of 9% of its width.
  • a ring 174 can be placed on the outer sides of the hexagons .
  • FIG. 17b Another embodiment is shown in fig. 17b, wherein the ring 174 has been replaced by broader strips in the other rings .
  • the transformer cores described above have all in common that the legs are perfectly regular, i.e., the corners thereof can be inscribed in a circle.
  • the invention also provides cores with legs that devi- ate slightly from the above described regular shapes.
  • FIG. 18 and 19 there are shown three-phase transformer cores with legs having corners that can be inscribed in two circles with different radiuses. Thus, every other corner protrudes from an inner cir- cle.
  • the outer corners can be inscribed in an outer circle. This is shown in figure 19, wherein the left lower leg is shown with two different circles touching the corners thereof.
  • x and y are two-dimensional co-ordinates and r is the radius of the circle.
  • the core can be shaped like the one 190 shown in figure 19.
  • This core is made up of three rings 194a-c to the left in the figure, three lower rings 193a-c and five rings 192a-e to the right in the figure.
  • the rings shown in figure 19 are described in the tables 1-3 below. TABLE 1
  • the magnetic field can now pass between rhomb and square and square and rhomb, respectively.
  • legs with twelve edges and angles of 60° and 12° are used.
  • the comparison value will be between 96,9% and 108,9%.
  • FIGS. 20a and 20b Yet another embodiments are shown in figures 20a and 20b.
  • the legs shown in figures 20a and 20b are essentially elliptical octagons, i.e., the cross-section can be inscribed in an ellipse.
  • the cross-section of each leg is a polygon essentially in- scribed in an ellipse with the major axis radially out from the centre line of the core.
  • the cross-section of each leg is a polygon essentially inscribed in an ellipse with the minor axis radially out from the centre line of the core.
  • the magnetic field can to a large extent pass from one yoke to another in the legs .
  • each leg can be described as being essentially positioned on an imaginary generalised circle defined by orthogonal coordinates x and y according to the following formula:
  • a and b are positive numbers and n is a posi- tive number ⁇ 2.
  • FIG 21a is a cross-sectional view
  • 21b is an end view showing a yoke part of a transformer core 210.
  • Three rings 212a, 213a and 214a are given a rhombic cross-section with an inner angle of 60°. They can then be assembled to triangular yokes and legs with five of the edges of hexagons.
  • FIG. 22 is a combination of the embodiments shown in Figs. 17 and 21 a, b. It shows how a three-phase transformer core which has had rings added can also help cooling the transformer. When putting rings on the legs to make its legs more rounded, one can also let strips transfer heat to the air by connecting these rings at the top and/or bottom of the transformer to a radiator/cooler of strips as shown in Fig. 22.
  • the core 220 can be provided with windings with segment strips using the principle of Fig. 17 using strips for filling the segments, but also filling the adjacent segments.
  • the ends of a pair of segment strips 221 and 222 are when necessary bent upwards for cooling and also bent downwards at the bottom.
  • a strip of ferromagnetic material is closely wound to a cooling ring 223 at the top of the core.
  • the ends of the segment strips 221 and 222 are spliced and connected to the strips 224, 225 in the cooling ring 223. Now both magnetic flux and heat are transferred.
  • the transformer is placed within a container 227. Sometimes the transformer is so hot that the con- tainer must be protected from the heat.
  • the inventive cores are very silent, they can be connected by means of a heat transferring material 226 to the container 227 or part of it. This is of interest because the resistance increases with tem- perature and the power losses increase as well. The transfer of noise from the core will be reduced by bends on the material, e.g. aluminum plate.
  • a set of wires or foils 228 from the windings can with advantage be attached to a cooling device 229, e.g. a body cooled by water circulating within it via pipes 229a.
  • FIG. 23 Another three-phase transformer core is shown in Fig. 23, and identified by the numeral 230.
  • Transformer core 230 is shown as a top view in Fig. 23 wherein tree yokes are visible.
  • a cross-section of core 230 is shown in Fig. 23a, which also shows the core, and the frames, in exploded form.
  • Core 230 has three frames 232, 233 and 234. It can be seen that frames 232-234 are different from each other, but this may be better for large transformers for reducing the strain on the core.
  • Frames 232-234 together form legs 235, 236 and 237. Considering the view shown in the centre portion of Fig.
  • Frame 233 is composed of a narrow thick ring 233a, another narrow thick ring 233b, a narrow thin ring 233c and another narrow thin ring 233d.
  • this leg includes a broad, thick ring 234a and a narrow, thick ring 234b.
  • Transformer core 230 is composed of a set of rings, all of which are made from transformer plate of one width for each ring, combined in such a manner as to provide the desired legs with a hexagon cross-section in each leg.
  • the construction of core 230 is different from other cores described earlier having hexagon cross-sections, but they all can be made using conven- tional manufacturing techniques with transformer plate of one width, namely broad or narrow.
  • a three-phase core with its legs in a row is relatively easy to assemble with octagonal legs, so one would not strive to make hexagonal legs.
  • Single-frame cores can advantageously be made with decagonal legs. There are many decagons with inscribed rhombs. One of the decagons has the advantage that all but one of the rings for filling the rhombs have their axes in the three directions deviating with a minimum angle of 36°.
  • a shell core 240 is shown in Fig. 24. It has rings providing in the cross section of shell core 240 rhombs 241a-j.
  • a frame core 250 is obtained and shown in Fig. 25. Rings can be wound with the distance between the turns so that air can pass through it.
  • the rhombs within the leg innermost is a rhomb with an angle of 72°.
  • the rhombs are in layers with the number of rhombs from innermost 4,3,2,1. They are marked from left to right 251c, 251b, 251a, 251j. In second row they are 251d, 251f, 251i. In third row they are 251e and 251h. Last is a rhomb marked 251g. In the first layer, the rhombs have all sides with the angle 72°.
  • the rhombs In the second layer, the rhombs have all sides with the angle 108°. In the third layer the rhombs have all sides with the angle 36°. In the fourth layer the rhomb has all sides with the angle 144°.
  • the rings need not have their frames or leg parts turned or yoke parts bent and were shown in Fig. 25.
  • the surface of the strips with the air will be very large.
  • inductor core according to the invention is shown. It can be seen that this inductor core has a construction very similar to the transformer core 20 shown in Fig. 2. However, the inductor, identified by the numeral 260, has a pair of air gaps extending through each leg.
  • inductor 260 includes three legs 265, 266 and 267, each having as a cross-section a hexagon as that shown in transformer core 20 in Fig. 2. Each leg has a pair of air gaps identified as 265a, 265b for leg 265, air spaces 266a and 266b for leg 266, and air gaps 267a and 267b for leg 267.
  • the hexagonal legs 265-267 could be replaced with cylindrical legs 270 shown in Fig. 27.
  • Each leg 270 is divided into two parts 271a, 271b having an air space 272 between them. Air spaces separate the opposite ends of leg 270 from the yokes of inductor 260.
  • Figs. 28a-28w The concept of the present invention can be used to provide legs of various cross sections, such as to fit into conductor coils having round or elliptical shapes, where the cross section approaches such shapes.
  • Fig. 28a is a quadrate 601.
  • Fig. 28b depicts a hexagon with three rhombs.
  • Fig. 28c shows an octagon with six rhombs.
  • Fig. 28d illustrates a decagon having ten rhombs.
  • Fig. 28q Another possibility is shown in Fig. 28q, where there is a decagon with ten rhombs, having no new rhombs created but are rather redistributed.
  • Figs. 28r through 28u are other examples of decagons.
  • Figs. 28h and 28i show the octagon in Fig. 28c from two different corners.
  • Figs. 28j and 28k show the octagon of fig. 28c from different sides.
  • Fig. 281 depicts the octagon of fig. 28c from a different direction.
  • Figs. 28m through 28n show that it is possible to alter rhomboids to rhombs in hexagons .
  • Fig. 28v illustrates that it is possible to inscribe rhombs in an ellipse.
  • a contour which can be divided into two curves, one with a 180° rotation with respect to the other curve, can have rhombs inscribed within it. Polygons with less number of sides will appear inside the original polygon. They can be mirrored or rotated 180° and make it possible to redistribute the rhombs. A rotated hexagon is marked with a circle in Fig. 28w.
  • matched irregular contours can circumscribe any form of collection of rhombs.
  • a three-phase transformer or inductor 290 according to the invention is shown in Fig. 29. It includes a three-phase transformer or inductor core 292 as discussed earlier. Transformer or inductor 290 includes a winding assembly 294 and operates in the conventional manner, but having improved operating capabilities due to the core.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

Un noyau de transformateur comporte au moins une branche et au moins une bobine de déviation. Chaque branche présente une section à bords multiples, c'est-à-dire à plus de quatre bords à angles intermédiaires. Le noyau est constitué de bagues enroulées formées à partir de bandes de largeur constante et les angles des branches sont positionnés sur un cercle généralisé imaginaire différent d'un cercle parfait. Un noyau d'inductance, un transformateur et une inductance sont également décrits.
PCT/SE2001/000454 2000-03-02 2001-03-02 Noyau de transformateur WO2001065572A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT01914262T ATE465501T1 (de) 2000-03-02 2001-03-02 Transformatorkern
EP01914262.9A EP1277217B2 (fr) 2000-03-02 2001-03-02 Noyau de transformateur
DE60141897T DE60141897D1 (de) 2000-03-02 2001-03-02 Transformatorkern
AU2001239609A AU2001239609A1 (en) 2000-03-02 2001-03-02 Transformer core

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US09/623,285 US6683524B1 (en) 1998-09-02 1999-09-02 Transformer core
SE0000710A SE517941C2 (sv) 2000-03-02 2000-03-02 Trefastransformatorkärna
SE0000710-4 2000-03-02
US09/623,285 2000-09-02

Publications (2)

Publication Number Publication Date
WO2001065572A2 true WO2001065572A2 (fr) 2001-09-07
WO2001065572A3 WO2001065572A3 (fr) 2002-01-17

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EP (1) EP1277217B2 (fr)
AT (1) ATE465501T1 (fr)
AU (1) AU2001239609A1 (fr)
DE (1) DE60141897D1 (fr)
WO (1) WO2001065572A2 (fr)

Cited By (6)

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EP2367181A1 (fr) * 2010-03-20 2011-09-21 ABB Technology AG Transformateur de type sec à haute performance et triphasées avec bobines isolées d'époxy et son procédé de fabrication
KR20110134316A (ko) * 2010-06-08 2011-12-14 에이비비 테크놀로지 아게 비결정질 금속으로 만들어진 삼각형 변압기 코어의 제조 방법
US20120267952A1 (en) * 2010-11-15 2012-10-25 Bloom Energy Corporation DC Micro-Grid
WO2013015701A1 (fr) * 2011-07-22 2013-01-31 Pejcic Ivan Noyau magnétique en delta
US20130219700A1 (en) * 2009-02-05 2013-08-29 Hexaformer Ab Amorphous Metal Continuous Flux Path Transformer and Method of Manufacture
US11158449B2 (en) 2015-03-12 2021-10-26 Guglielmo MONTAGNANI Method and device for manufacturing transformers with a core made of amorphous material, and transformer thus produced

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Publication number Priority date Publication date Assignee Title
DE102014103526A1 (de) 2014-03-14 2015-09-17 Maschinenfabrik Reinhausen Gmbh Laststufenschalter, Stufentransformator zur Spannungsregelung und Verfahren zur Durchführung einer Umschaltung im Stufentransformator

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UA54619C2 (uk) † 1998-09-02 2003-03-17 Леннарт Хеглунд Осердя трансформатора

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US2333464A (en) * 1940-11-29 1943-11-02 Gen Electric Stepped outline wound core
US2544871A (en) * 1947-04-24 1951-03-13 Mcgraw Electric Co Three-phase transformer

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See also references of EP1277217A2 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130219700A1 (en) * 2009-02-05 2013-08-29 Hexaformer Ab Amorphous Metal Continuous Flux Path Transformer and Method of Manufacture
EP2367181A1 (fr) * 2010-03-20 2011-09-21 ABB Technology AG Transformateur de type sec à haute performance et triphasées avec bobines isolées d'époxy et son procédé de fabrication
WO2011116850A1 (fr) * 2010-03-20 2011-09-29 Abb Technology Ag Transformateur sec triphasé à haute performance doté de bobines isolées à l'époxyde et son procédé de fabrication
CN102792398A (zh) * 2010-03-20 2012-11-21 Abb技术有限公司 具有环氧绝缘线圈的三相高性能干式变压器及其制造方法
KR20110134316A (ko) * 2010-06-08 2011-12-14 에이비비 테크놀로지 아게 비결정질 금속으로 만들어진 삼각형 변압기 코어의 제조 방법
KR101867947B1 (ko) * 2010-06-08 2018-07-19 에이비비 슈바이쯔 아게 비결정질 금속으로 만들어진 삼각형 변압기 코어의 제조 방법
US20120267952A1 (en) * 2010-11-15 2012-10-25 Bloom Energy Corporation DC Micro-Grid
US8970176B2 (en) * 2010-11-15 2015-03-03 Bloom Energy Corporation DC micro-grid
US20150130277A1 (en) * 2010-11-15 2015-05-14 Bloom Energy Corporation Dc micro-grid
WO2013015701A1 (fr) * 2011-07-22 2013-01-31 Pejcic Ivan Noyau magnétique en delta
US11158449B2 (en) 2015-03-12 2021-10-26 Guglielmo MONTAGNANI Method and device for manufacturing transformers with a core made of amorphous material, and transformer thus produced

Also Published As

Publication number Publication date
WO2001065572A3 (fr) 2002-01-17
AU2001239609A1 (en) 2001-09-12
ATE465501T1 (de) 2010-05-15
EP1277217B1 (fr) 2010-04-21
DE60141897D1 (de) 2010-06-02
EP1277217B2 (fr) 2013-06-05
EP1277217A2 (fr) 2003-01-22

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