CN1178234C

CN1178234C - Transformer core

Info

Publication number: CN1178234C
Application number: CNB998106119A
Authority: CN
Inventors: ��ء��ո�¡; 伦纳特·赫格隆
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-09-02
Filing date: 1999-09-02
Publication date: 2004-12-01
Anticipated expiration: 2019-09-02
Also published as: ZA200101707B; EE04406B1; PL346275A1; CA2342331A1; EP1110227B1; EE200100137A; NO20011043L; JP2002524866A; HK1039827A1; AP2001002081A0; AU757893B2; CZ297230B6; NO20011043D0; EA004162B1; YU17101A; KR100613751B1; CA2342331C; AP1302A; HU225832B1; IL141670A

Abstract

A transformer core comprises at least one leg and at least one yoke part, wherein the cross section of the leg or the legs is regularly multi-edged with more than four edges. The core is made up of rings rolled from strips of constant width, whereby good electrical properties are achieved. The transformer is also easy to manufacture and avoids waste of material.

Description

Transformer core

Technical field

The present invention relates to transformer core, especially comprise the three-phase and the single-phase iron core of regular polygon pillar.

Background technology

The three-phase transformer iron core is made by the transformation sheet usually, and they cut into EI shape to small transformers, and they cut into the rectangular sheet that the edge-to-edge is provided with to big transformer.Its shortcoming is that magnetic field must be delivered on the sheet from sheet through the limit, and must can not always advance along magnetic orientation through the path of unnecessary length in magnetic field.

The designer of transformer core is devoted to obtain to have substantially and is the pillar of circular cross section, because final like this transformer is the most effective.But, balance between must and produce needing in efficient, can only produce what have non-circular pillar so is not optimum transformer core.

Unshakable in one's determination being difficult to of the silver of three-phase transformer processed.Efficient unshakable in one's determination can be by cutting into variable width with silver and the winding ring increases, to the given circular cross section of single-phase transformer and to the given semi-circular cross-section of three-phase transformer.This method has produced a large amount of wastes and the winding step is very consuming time.

US 4,557, and 039 (Manderson) disclosed the method that a kind of use has the electrical sheet silver processing transformer core of linear gradient.By selecting suitable gradient, the hexagon of a pillar unshakable in one's determination or the cross section of more approaching circle generate.But the slanted bar sheet is difficult to processing and very consuming time, and its design incompatibility large-scale production.

The three-phase transformer iron core 10 of the prior art of Manderson has been shown in Fig. 1 a-1c.Iron core has △ shape, and as seen, wherein three pillars are interconnected by yoke portion in the stereogram from Fig. 1.In Fig. 1 a, show a cutaway view unshakable in one's determination before assembling.Iron core comprises three identical

annular sections

12,13 and 14, and its basic configuration is shown in Figure 1.Each annular section is filled into two half height with pillar of hexagonal cross-section, constitutes three pillars of a three-phase transformer like this.Annular section at first is wound in three

identical rings

12,13 and 14 by the silver of constant width, has lozenge shape cross-section, comprises two 60 ° angle and two 120 ° angle.These rings 12a-14a constitutes basic ring.The orientation of silver is also shown in Fig. 1 a and the 1b.

There are an outer shroud 12b with equilateral triangle cross section, 13b, 14b in the basic ring outside in each annular section.Outer shroud is entwined by having the band that constant width reduces.

When three annular section 12-14 combine, see Figure 16, they form three hexagon pillars, are wound with Transformer Winding on it.

A shortcoming of this scheme is that each size of transformer needs the silver cutting of himself.And outer shroud 12b-14b makes and can produce waste by having silver that width reduces, but also makes the transformer according to Manderson be difficult to processing.

Also described transformer core in following file, they are: SE 163797, and US 2,458,112, and US 2,498,747, and US 2,400, and 184 and US 2,544,871.But the iron core in the above-described file can not overcome the problems referred to above.

Summary of the invention

An object of the present invention is to provide a kind of transformer core, wherein energy loss is reduced to minimum.

Another object of the present invention provides a kind of transformer core, and it can easily process and avoid waste of material.

Also purpose of the present invention provides a kind of method of processing transformer, and it can adapt to large-scale production well.

The understanding that the present invention is based on is, one has one or more transformer cores that have more than the regular polygon pillar on four limits and can be entwined by the silver of the material with constant width.

According to the present invention, a kind of transformer core is provided, comprise two or three pillars and the yoke portion that links to each other with described pillar, the cross section of wherein said pillar is to have the regular polygon that surpasses more than four limits, it is characterized in that, described iron core is made by the ring that the silver rolling from constant width forms, and each described ring constitutes the part of two described pillars

Other preferred embodiment limits in the dependent claims.

Description of drawings

With exemplary approach the present invention is described with reference to the accompanying drawings, wherein:

Fig. 1 is a stereogram of the three-phase transformer iron core of the prior art made by the ring that has rhombus and triangular cross section;

Fig. 1 a and 1b are respectively before assembling and the cutaway view of the iron core shown in Fig. 1 afterwards;

Fig. 2 is a stereogram of the present invention's one three-phase transformer iron core, and iron core has the pillar with hexagon cross section;

Fig. 2 a and 2b are respectively before assembling and the cutaway view of the iron core shown in Fig. 2 afterwards;

Fig. 3 a and 3b be the three-phase transformer iron core of a variation have a hexagon cross section column sections respectively before assembling and cutaway view afterwards;

Fig. 4 is a stereogram that has the three-phase transformer iron core of octagon pillar;

Fig. 4 a is a cutaway view of the iron core shown in Fig. 4;

Fig. 5 is the cutaway view that has a transformer of decagon pillar;

Fig. 6 is the cutaway view that has a transformer pillar of twelve edge;

Fig. 7-9 illustrates the setting that is used for influencing a three-phase transformer leakage inductance and harmonic wave;

Figure 10 is the cutaway view that the yoke that has a given shape partly is used to improve a three-phase transformer iron core of magnetic flux;

Figure 11 illustrates a three-phase transformer iron core of the pillar that has arrangement;

Figure 12-14 illustrates single-phase transformer iron core of the present invention;

Figure 15-17 illustrates the further improvement of transformer core shape of cross section.

Embodiment

The preferred embodiment of the present invention's one three-phase transformer iron core is described below.

In conjunction with prior art Fig. 1 is described, and following no longer explanation.

Three-phase transformer iron core 20 of the present invention shown in Fig. 2.Its basic configuration is similar to the transformer core of the prior art shown in Fig. 1, has a △ shape substantially, but design in a completely different way.

Iron core is made by three

annular sections

22,23,24, and annular section comprises several rings.Two width broad or narrower are arranged like this, and wherein narrow ring is by making for half silver of wide ring width.And they have lower or higher two height, half that the wherein low height that encircles is the epipodium height.Except as otherwise noted, use these qualifications in this manual in the whole text.Silver is preferably made by transformer plate.

Each annular section 22-24 comprises a wide and high basic ring 22a-24a respectively, and this is with similar described in Fig. 1.Like this, these rings form four sides in pairs in the hexagon pillar.Remaining rhomboid constitutes in a different manner in the pillar, sees Fig. 2 a and 2b.

In innermost first pillar 25, additional lozenge shape cross-section is made of two rhomboids.First represents and belongs to annular section 24 with 24b, it is a wide low ring.Represent and belong to annular section 22 with 22b for second, it is a narrow epipodium.

In second pillar 26 on the right, additional rhomboid cross section is made of a rhomboid and two rhomboids in Fig. 2.Rhomboid is filled by the narrow epipodium 22b that belongs to annular section 22.Rhomboid is filled by two that belong to annular section 23 narrow

low ring

23b, 23c.

In the 3rd pillar 27 on Fig. 2 left side, additional rhomboid cross section also is made of a rhomboid and two rhomboids.Rhomboid is filled by the wide low ring 24b that belongs to annular section 24.Rhomboid is filled by two that belong to annular section 23 narrow low ring 23b, 23c.Annular section 23 comprises that the reason of two low narrow rings rather than a bigger ring is, bigger ring can not be both as narrow and high and for example required like that wide and low in right pillar 26 required in the left pillar 27.So just use two narrow low rings.

Last or the lower yoke of all connecting struts 25-27 all has different shapes, but all adds that by a basic ring with big rhomboid cross section ring or two rings with less rhomboid cross section with rhomboid cross section constitute.All like this yokes all have identical total cross-sectional area.

Certainly fill according to some basic principles in the rhomboid space in the basic ring outside.Below with reference to Fig. 3 a and 3b one second embodiment is described.Be typically expressed as 30 iron core and have essentially identical shape with above-mentioned first embodiment.But iron core comprises three identical annular section 32-34 in this embodiment, describes below rightmost one 32.Annular section 32-34 is similar with the part 23 that combines Fig. 2 description.In first pillar 35, annular section 32 comprises two narrow

low ring

32b, 32c, wherein encircles 32c and is centered around the ring 32b outside.In second pillar 36, two of annular section 32

ring

32b, 32c side offside each other are provided with, and see Fig. 3 a.

All the other two

parts

33,34 are identical with first 32.All three annular section 32-34 like this, depend on that usually the production of output iron core can be simplified, because can be made by identical mould.

At Fig. 2 a, 2b or 3a, among the embodiment shown in the 3b, all rings have the lozenge shape cross-section that has two 60 ° of angles and two hexagonal angles

Can also process 60 ° in wide low ring and rotation post portion, force yoke part respective curved.Yoke partly needs more space and bending to be not easy to realize like this.Also can process narrow epipodium and rotation and crooked as mentioned above, but this is relatively more difficult.Can also comprise that those have the other variation of less fractionation.

Describe one below with reference to Fig. 4 and 4a and be typically expressed as 40 the iron core that has the octagon pillar.In an octagonal cross-section, for example referring to back prop 45, side rotates 45 °, and this represents that they have relative to each other 135 ° relative angle.Each three rhomboid that have a 45 then forms in the inside of pillar unshakable in one's determination.In these rhomboid outsides, two squares are by the ring filling that has square cross section.At last, the remainder of the octagonal cross-section of a rhomboid filling pillar.

From these six sub-cross sections, three sub-cross sections constitute the cross section of a forming ring of ownership second column sections 46.Remaining sub-cross section constitutes the cross section of the forming ring in ownership the 3rd column sections 47.Also have a forming ring to connect the second and the

3rd column sections

46,47.

These three forming rings all comprise two rings that have same struts portion.One first ring 42a, 43a, 44a has a rhomboid cross section and crooked 15 ° of yoke part.One second ring 42b, 43b, 44b is outside first ring and be square, and follows first form of encircling 42a-44a.

Use is with reference to Fig. 2 and the 3 described a kind of schemes that have the embodiment of hexagon pillar, and two outer rhomboids constitute a cross section that has crooked 15 ° yoke outer shroud partly.Perhaps, encircle but crooked 60 ° in two interior rhomboids constitute one.Next ring must provide rhomboid one outside and provide one in also 30 ° of bendings of rhomboid in other pillars in a pillar.Its preferably a kind of forming ring because be difficult to 60 ° on a crooked ring, and can not be avoided not only having an outer rhomboid but also have rhombic ring in.

In part 42, the 3rd ring 42c has a rhomboid cross section and be placed on back prop 45 outermost but be positioned at right pillar 46 in column sections in column sections.These rhomboids of column sections can by pillar 46 right sides to the right and backward the outer silver of column sections 45 left side shift(ing) rings obtain.In addition, pillar rotates 30 ° and the correspondingly bending of yoke portion asymmetricly.Encircle such side face, it is positioned at the outside of other rings.Final result displays in Fig. 4.

Below with reference to Fig. 5 a decagon pillar 50 is described.Forming ring comprises all four rings that have same struts portion.The first ring 50a, the second ring 50b and the 3rd ring 50c that have lozenge shape cross-section in its column sections are connected on the decagon cross section.They have the angle of 36 °, 72 ° and 108 ° and crooked 24 ° of its yoke part like this.One has a Fourth Ring 50d who has the rhomboid cross section at 36 ° of angles and mainly is positioned on the first ring 50a.Its column sections is outwards rotated 24 °, makes crooked 48 ° of its yoke.The Fourth Ring also makes the yoke part bending of the 3rd ring 50c bigger so that the space to be provided.When it was positioned at for the 3rd ring 50c when outside, a five rings 50e has a lozenge shape cross-section that has 144 ° of angles in its column sections, but when it was positioned at outside the 50d of Fourth Ring, five rings 50e had a lozenge shape cross-section that has 72 ° of angles.Only crooked 12 ° of yokes.Arrow among the figure represents that cross section 50e belongs to different forming rings.And a passage 51 is suitable for cooling off pillar.In the embodiment of a variation, passage is filled with a ring.When this is an advantage when magnetic field being produced make the ring co-operation between it.The space can for example be manipulated so the top of ring 50c and obtain the new lozenge shape cross-section that has 72 ° of angles, and

passage

52a and 52b can be formed.The other part of the right ring 50c can be pushed to ring 50e, and it forms

space

53a and 53b.

Can provide and have more polygon three-phase transformer iron core.Fig. 6 illustrates a dodecagonal iron core 60.Forming ring is made of four ring 60a-d, and they have the lozenge shape cross-section that has 30 °, 60 °, 90 ° and hexagonal angle, and these rings are connected on the dodecagon cross section and turn over 15 °.Two

rings

60e, 60f are arranged in these rings, have the lozenge shape cross-section that has 30 ° and 60 ° angles respectively and outwards turn over 15 °.A space that is used to encircle 60g is connected the 5th and the

6th ring

60e, 60f, and ring 60g has one and has the lozenge shape cross-section at 30 ° of angles and outwards turn over 45 °.Other column sections is that a rectangle in the 6th ring 60f outside also outwards turns over 15 °.A space that is used to encircle 60h is arranged at ring on the 60d, ring 60h has a lozenge shape cross-section that has 150 ° of angles, and other column sections is one and is connected to that ring 60d goes up and at the rectangle in the ring 60f outside.So just filled entire cross section.By providing bigger bending to come to separate yoke portion for other yoke portions provide the space.

Can obtain even better transformer core characteristic some transformer application occasions, see Fig. 7.Can easily increase leakage inductance by an other iron core 29 of making by silver between primary and secondary winding.Silver combines at top and bottom.Silver can stretch around whole elementary winding, or concentrates on a place, makes secondary winding off-centre.

The nonlinear magnetism characteristic of iron produces harmonic wave in magnetic field, electric current and voltage.

An other pillar that is placed on center unshakable in one's determination under good symmetry and undistorted three-phase state can not obtained any magnetic field.Composition such as third harmonic common in phase voltage are influenced by a centre strut.

And a combination of silver can be arranged between a winding and a centre strut.

In one embodiment, the triangle magnetic pole 80 that centre strut is made by three silvers constitutes, and wherein highly is three times of width, and they form a square cross section in the position each other thereon, see Fig. 8.Be preferably triangle and a scheme customized comprises the magnetic pole that has a lozenge shape cross-section, wherein combine and form a bag for three, Fig. 9 towards each other, is seen in the silver limit in a wave form.These bags are put together with little spacing and are formed one and have the pillar that is approximately triangular cross section.The outwardly-bent arrival yoke in the end of magnetic pole.For bending need leave spacing body between magnetic pole.Spacing body does not influence magnetic characteristic, because from each bag 91a-c; 92a-c; The magnetic pole of 93a-c is to each yoke bending.And these silvers are parallel to spacing body at least on a side.

If when between centre strut and yoke, air gap being arranged one to be wound in the bar of spirality or solenoid by silver particularly useful.Helix can be wideer to be reduced to the air gap of yoke in the end.

It is very good and be shown among Figure 10 similarly to constitute flexibility unshakable in one's determination.In conjunction with the described iron core of Fig. 4, the major part of magnetic flux can be passed to another forming ring from a forming ring in pillar shown in the figure, and wherein they contact with each other.This can make bigger magnetic flux rotate in the yoke triangle.

According to the present invention, can provide one to have the three-phase transformer iron core of arranging pillar.This has the following advantages, i.e. transformer unshakable in one's determination narrow than △ shape.This transformer is very desirable for for example being placed on the railway carriage.

Figure 11 a illustrates a cutaway view that has the transformer of octagon pillar.All pillars comprise four rhomboid and two squares of having 45.Be illustrated in the ring between the adjacent struts in the drawings, and the ring of those between the pillar is blocked almost completely outside.

In order to make this transformer core, column sections must bending and also yoke portion can transmit crooked and each other.Several schemes are arranged here, a kind of shown in the figure.The column sections of ring is outwardly-bent and yoke portion curves inwardly, and is perhaps opposite.The shape of yoke portion is limited by limited plastic deformation possibility, but yoke portion can have Any shape.Principle shown in Figure 11 can obtain very curved shape and very straight yoke portion.

Ring can also be placed on it each other circular bend is provided, to save material.

Yoke between left side pillar 115 and the centre strut 116 is made of a ring 112a, a ring 112b and a ring 112c, ring 112a has a lozenge shape cross-section in column sections, ring 112b has square cross section, all crooked 22.5 ° on two rings, and ring 112c turns over 67.5 ° in column sections.Ring 112a and 112b are installed to octahedra going up near the yoke side, and ring 112c is installed in the opposite side.

Yoke between centre strut 116 and the right pillar 117 is only to be placed in the centre strut in the 114a-c of the position of remainder.116 one-tenth mirror images of the cross section of left and right pillar 115,117 and centre strut, the ring symmetry in centre strut like this.Interior ring 114a, 114b position in right pillar 117 is nearest.But the ring 114c that has square cross section in column sections arrives square position nearest in the right pillar.The ring 113a that its reason is to have between the pillar outside a square cross section is positioned on the external position in the already present yoke portion, to arrive left pillar.

The rotation of yoke can not obtain.In the embodiment of a variation, use a discount that slowly tilts.Ring 114c of short yoke illustrates to having for this.Discount begins and finishes at the other end at yoke one end, in Figure 11 lower yoke is marked by 118a and upper magnet yoke is marked by 118b.And yoke can be divided into several narrow rings.

If given polygon cross section, a single-phase transformer also can be more effective.Figure 12 illustrates a transformer with octagonal cross-section, and transformer is by constituting with the ring that has identical cross-section in three-phase transformer, but has along the winding outside loop of advancing in path recently.Ring can be changed but still have an octagonal cross-section.Obtain minimizing slightly on the left side of ring that can be by forming ring around the rightmost side in the drawings to transformer plate quantity.Its cross section must change becomes a rhombus near rectangle.

An iron core that has two pillars can be by being made by three-phase design only to form a pillar again from a pillar is crooked together.In its column sections, have an octagonal cross-section at the iron core shown in Figure 13.Three column sections are rotated 45 ° and crooked 90 °.Ring and two rings outside this ring that have rectangular cross section can not be out of shape.Three rings that the iron core that has a hexagon pillar only need be made by the silver with same widths.

If wherein the octagon limit of meeting, three rhomboid limits is positioned at penetralia unshakable in one's determination, except rotating 67.5 ° in the rhomboid of centre, remaining rotation has only 22.5 °.Replace this rhombic step basic the same with a ring with rhombic step, but more feasible and be shown among Figure 14.Can further be improved by making silver become circle, increased entire cross section like this.

The section in a polygon pillar outside can be by a thin rhombus ring filling that is made of a silver, and its width is about half and highly is the overall height of whole section, and is wound to its whole width.Form the both sides of a flat side along the discount of rhombic centre among Figure 15 in band, a triangle is provided, its side contacts with unshakable in one's determination.Discount has about 2/3 width and 8/9 height, and discount forms a trapezoidal cross-section as shown in Figure 16 on the limit of inner most silver.This cross section also can be circle.

By the silver of constant width, column sections can have the shape of cross section of a comparison near a circle, sees Figure 17,17a and 17b.Below with reference to the example of Figure 17 a right pillar 172 among Figure 17, a cross section of described pillar shown in it are described.At penetralia, the width of ring 173 is 80% of a whole width, and highly is 9% of its width.There are three rings to form a circumscribed circle, see Figure 17 a.

Four in these six sections are filled with magnetic material, and the silver in the outside unshakable in one's determination of this composition can be filled other section.

A ring 174 can be arranged on hexagonal outside.

At another embodiment shown in Figure 17 b, wherein encircle 174 and replaced by the silver of the broad in all the other rings.

Some advantages of transformer core of the present invention have below been mentioned.Other advantage is: low or no-load loss, and in light weight, volume is little, and it is little to leak electricity, because the symmetry of the phase of three-phase transformer can reduce resonance, easy maintenance etc.

The preferred embodiment of transformer core of the present invention has more than been described.Those skilled in the art can change in the scope of claims.

Claims

(modification)

1. transformer core, comprise two or three pillars and the yoke portion that links to each other with described pillar, the cross section of wherein said pillar is to have the regular polygon that surpasses four limits, it is characterized in that, described iron core is made by the ring that the silver rolling from constant width forms, and each described ring constitutes the part of two described pillars.
2. transformer core according to claim 1 is characterized in that described pillar has hexagonal cross-section.
3. transformer core according to claim 2 is characterized in that, comprises nine rings.
4. transformer core according to claim 3, it is characterized in that, ring and six silvers by second width of comprising three silvers by first width to be wound to first height and making are wound to second ring of highly making, wherein second width is equivalent to half of first width, and second highly be equivalent to first the height half.
5. transformer core according to claim 4 is characterized in that, comprises

First (32), second the (33) and the 3rd (34) annular section, wherein each annular section comprises:

One first ring (34a), it is wound to first height by the silver with first width and makes for 32a, 33a, and the cross section of described ring is the rhombus that has two 60 ° of angles,

One second ring (32b, 33b, 34b), it is equivalent to half a silver of second width of first width substantially and is wound to second height that is equivalent to first mid-height substantially and makes by having, and described second ring has lozenge shape cross-section and is positioned at described first ring (32a, the 33a, 34a)

One the 3rd ring (32c, 33c, 34c), it is wound to second height by a silver with second width and makes, and described the 3rd ring has lozenge shape cross-section, and is positioned to: in a position, described the 3rd ring is positioned at described first ring, and (32a, 33a 34a) go up contiguous described second ring; And in another position, described the 3rd ring is positioned on described second ring,

Described first, second assembled one of formation thus with the 3rd annular section and had three three-phase transformer iron cores that have the pillar of hexagonal cross-section.
6. transformer core according to claim 2 is characterized in that, comprises seven rings.
7. transformer core according to claim 6 is characterized in that, comprising:

First (22a), second (23a) and the 3rd (24a) ring, it is wound to first height by the silver with first width and makes, the cross section of described ring is the rhombus that has two 60 ° of angles, and described first, second forms the yoke part and form a triangle together with the 3rd ring

A Fourth Ring (24b), it is wound to second height that equals first mid-height substantially by a silver with described first width and makes, and described Fourth Ring has oblique rectangular cross section and is positioned on described the 3rd ring (24a),

A five rings (22b), it equals half a silver of second width of first width substantially and is wound to described first height and makes by having, and described five rings has oblique rectangular cross section and is positioned on described first ring (22a),

One the 6th ring (23b), it is wound to described second height by a silver with second width and makes, described the 6th ring has lozenge shape cross-section, and is positioned at described second ring (23a) bottom in a position and is positioned at the top of described second ring (23a) in the another location, and

One the 7th ring (23c), it is wound to described second height by a silver with second width and makes, described the 7th ring has lozenge shape cross-section, and upward being positioned at described second ring (23a) in the another location goes up contiguous described the 6th ring (23b) to be positioned at described the 6th ring (23b) in a position

Thereby can form one and have three three-phase transformer iron cores with pillar of hexagonal cross-section.
8. transformer core according to claim 1 is characterized in that described column sections has octagonal cross-section.
9. transformer core according to claim 8 is characterized in that, comprise first, second and the 3rd moulding ring, each moulding ring comprise three rings that all have two column sections and two yoke portions (42a, 42b, 42c), wherein

First ring (42a) has the lozenge shape cross-section that has 45 in its column sections, and yoke portion is towards 15 ° of angles of central bend of described transformer core,

Second the ring (42b) its column sections have square cross section and be positioned at described first the ring on, and

The 3rd ring (42c) has lozenge shape cross-section in its column sections, one first column sections mainly is positioned on described first ring (42a), described first column sections has at the lozenge shape cross-section that towards the angle point place at described transformer core center one interior angle is 45 °, and one second column sections is positioned on described second ring (42b), it is 135 ° lozenge shape cross-section that described second column sections has at the interior angle towards the angle point place at described transformer core center

Described first, second is assembled into one with the 3rd moulding ring and has three three-phase transformer iron cores that have the pillar of octagonal cross-section.
10. transformer core according to claim 1 is characterized in that, described pillar has a cross section that has ten limits.
11. transformer core according to claim 10 is characterized in that, comprises first, second and the 3rd moulding ring, each moulding ring comprises five rings (50a-e) that all have two column sections and two yoke portions, wherein

First ring (50a) has the lozenge shape cross-section at 36 ° angle in its column sections,

Second ring (50b) has the lozenge shape cross-section at 72 ° angle in its column sections,

The 3rd ring (50c) has the lozenge shape cross-section at 108 ° angle in its column sections,

Fourth Ring (50d) has lozenge shape cross-section in its column sections, and described lozenge shape cross-section has 36 ° angle, and described Fourth Ring mainly is positioned on described first ring (50a), and its yoke is outwards rotated 48 ° angle, and

Five rings (50e) has the lozenge shape cross-section at 144 ° angle in its column sections when it is positioned on the 3rd ring (50c), and be positioned at the lozenge shape cross-section that the outside, Fourth Ring (50d) time has 72 ° angle when it, and a passage (51) is suitable for cooling off described pillar in five rings (50e) outside

Described first, second is assembled into one with the 3rd moulding ring and has three three-phase transformer iron cores that have the pillar of decagon cross section.
12. transformer core according to claim 1 is characterized in that, all rings have the lozenge shape cross-section that has two 60 ° of angles and two hexagonal angles.
13. transformer core according to claim 1 is characterized in that, comprises an other iron core (70), is made up of silver, top and bottom at iron core between winding gather together.
14. transformer core according to claim 1, it is characterized in that, the thin ring filling that section between described pillar cross section and the circumscribed circle is made of a silver, described thin ring have described section width half width and the whole height of described section height, and be wound to the whole width of described section.