WO2010143710A1

WO2010143710A1 - Frame-shaped iron core and method for assembling same

Info

Publication number: WO2010143710A1
Application number: PCT/JP2010/059925
Authority: WO
Inventors: 重紀岡田; 孝長谷川; 知司座馬; 重嘉酒井; 伸司樫村; 久伊藤; 信夫楢原
Original assignee: タカオカ化成工業株式会社; 株式会社関電工; 株式会社アット東京
Priority date: 2009-06-12
Filing date: 2010-06-11
Publication date: 2010-12-16
Also published as: JP2010287756A; JP5604059B2

Abstract

Provided is a frame-shaped iron core comprising a yoke (2), the two ends of which are connected by a leg (3). The yoke comprises a pair of magnetic bodies and the leg comprises a magnetic body. The yoke and the leg are each formed by layering a plurality of strip-shaped blocks (20, 30) staggered alternately in the length direction. The join areas thereof are tilted at an angle of 45°. A nonmagnetic sheet member (5) is provided connected to the seam areas where the blocks (20) of the yoke and the blocks (30) of the leg are joined.

Description

Frame-shaped iron core and method for assembling the same

The present invention relates to a frame type iron core and a method for assembling the same.

As is well known, a transformer is configured by attaching a coil constituting a conductive circuit to an iron core constituting a magnetic circuit. There are various types of structures of the iron core, and one of them is a type called a laminated iron core constructed by appropriately stacking blocks made of band-shaped silicon steel plates. Since the iron core forms a magnetic circuit by appropriately arranging strip-like blocks, a gap is generated at the joint between the ends of adjacent blocks. In such an iron core with a gap, there is a demand for reducing the magnetizing inrush current while reducing the residual magnetic flux, and the invention disclosed in Patent Document 1 has been proposed.

The invention disclosed in Patent Document 1 is configured by appropriately stacking rectangular blocks to form a planar rectangular stacked iron core. Each block has a configuration in which a non-magnetic insulator or metal body is provided on one surface or both surfaces of a rectangular silicon steel plate. And the structure which interposes a nonmagnetic insulator etc. between each layer of the block piled up and down by taking up the block is taken.

JP-A-7-94341

As described above, in the technique disclosed in Patent Document 1, since the nonmagnetic insulator or metal body is provided over one surface or both surfaces of each block, the occupation ratio of the magnetic material in the iron core is reduced, and desired characteristics are obtained. In order to obtain it, the new problem that an increase in size and weight cannot be avoided arises. Therefore, there is a problem that it is desired to reduce the magnetizing inrush current while reducing the size and weight.

In order to solve the above-described problems, a frame-shaped iron core according to the present invention is configured by (1) connecting at least both ends of a yoke portion made of a pair of magnetic bodies with legs made of a magnetic material, and The iron part and the leg part are laminated while alternately shifting a plurality of strip-like blocks in the longitudinal direction, and in the frame-shaped iron core whose joint part is inclined, the block for the yoke part and the leg part A nonmagnetic member was arranged in a continuous state at the seam where the blocks were joined.

As a result of experiments, it was confirmed that the residual magnetic flux density was reduced by adopting such a configuration. And since the nonmagnetic member is continuously arranged at the joint part, it is not arranged on the entire surface of the yoke part and the leg part other than the joint part, and the existence ratio of the magnetic substance in the yoke part and the leg part is increased. (The ratio of non-magnetic members present can be reduced), and miniaturization and weight reduction can be achieved.

(2) The non-magnetic member can be a sheet member. The material may be a desired resin film, or a sheet member made of insulating paper or other various materials can be used. Specifically, for example, a polymer film, a polymer fiber sheet, a surface coating sheet, a resin-impregnated sheet, insulating paper, a nonwoven fabric, a glass cloth sheet, and the like can be used. In order to bend appropriately, it is desirable to use a resin film having stretchability and strength. (3) The non-magnetic member may be configured by applying a non-magnetic paint. In this way, it is possible to easily dispose the nonmagnetic member even if the joint surface is uneven.

(4) The yoke block and / or the leg block may be formed by stacking a plurality of silicon steel plates. If it does in this way, a residual magnetic flux density will decrease, and the extent of the reduction will increase, so that there are many sheets.

(5) At least one block among the blocks formed by stacking the plurality of silicon steel plates may be set so that a silicon steel plate located on one or both surfaces is short and does not overlap the seam portion. In the embodiment, this short silicon steel plate is a silicon steel plate denoted by reference numeral 22, and is disposed only on one lower surface. This is preferable because the existence ratio of the magnetic body per unit volume (cross-sectional area) in the iron core is further improved.

(6) The assembly method of the present invention is configured by connecting at least both ends of a yoke portion made of a pair of magnetic bodies with legs made of a magnetic material, and each of the yoke portion and the legs is made up of a plurality of bands. It is a method of assembling a frame-shaped iron core in which the plate-shaped blocks are stacked while being alternately shifted in the longitudinal direction, and the joint portion thereof is inclined, and the yoke block or the leg block is stacked and stacked. The yoke part or the leg part is formed, and then the nonmagnetic sheet member is disposed opposite to the side surface of the formed yoke part or the leg part, and the leg member is pushed in by pushing the sheet member. The side surface of the block or the block for the yoke portion is inserted into the joint portion on the side surface of the yoke portion or the leg portion.

In the present invention, since the non-magnetic member is continuously arranged at the joint portion of the joint portion between the yoke portion and the leg portion, it is possible to suppress the decrease in the existence ratio of the magnetic body in the iron core, and to enter the magnetism while reducing the size and weight. The current can be lowered.

It is a top view which shows suitable one Embodiment of this invention. FIG. It is a figure which shows one Embodiment of the assembly method. It is a top view which shows another suitable one Embodiment of this invention. It is a graph which shows an experimental result.

FIG. 1 is a plan view showing an embodiment of an iron core according to the present invention, and FIG. 2 is a cross-sectional view of a joint portion. The iron core 1 according to the present embodiment is formed in a planar rectangular shape by joining both ends of a pair of yoke portions (also referred to as “yoke portions”) 2 arranged at the top and bottom with legs 3. And both the yoke part 2 and the leg part 3 are comprised using a directional silicon steel plate. The joint surface between the yoke portion 2 and the leg portion 3 is inclined by 45 degrees, and the joint surfaces are appropriately overlapped and joined to form a so-called frame-shaped iron core. In the present embodiment, the joint is inclined at 45 degrees, but the angle can be any angle (acute angle) such as 30 degrees or 60 degrees.

As shown in FIG. 2, the yoke part 2 is configured by laminating a plurality of band-like yoke part blocks 20. Similarly, the leg portion 3 is configured by laminating a plurality of leg plate blocks 30 in the form of strips. The yoke part block 20 and the leg part block 30 are each configured by stacking a plurality (n) of strip-shaped directional silicon steel plates. Each directional silicon steel plate has an isosceles trapezoidal plane shape in which both ends in the longitudinal direction are inclined 45 degrees in the rolling direction.

And each yoke part block 20 is shifted by a predetermined distance X alternately in the longitudinal direction when laminating. As a result, each yoke part block 20 has its one end alternately protruding sideways by a predetermined distance X. Similarly, the leg blocks 30 are also stacked while being shifted by a predetermined distance X alternately in the longitudinal direction. At this time, the adjacent yoke block 20 and leg block 30 are reversed in the direction of shifting, and the protruding tip of each block enters the other party's retracted space.

Here, in the present invention, a continuous insulating / nonmagnetic sheet member 5 is disposed between the joint portions (joining portions) of the yoke portion 2 and the leg portion 3. This sheet member can be made of a thin resin film or a material that can be easily deformed, such as insulating paper, or the like as appropriate. That is, the sheet member 5 is arranged in a continuous state at the butting portion where the

tip side surfaces

20a, 30a of each

block

20, 30 face each other and the overlapping portion where the top and

bottom surfaces

20b, 30b face each other. Thereby, at least the gap of the film thickness of the sheet member 5 is ensured on the joint surface between the adjacent yoke portion 2 and the leg portion 3. The magnetic flux flowing from the yoke part 2 to the leg part 3 and from the leg part 3 to the yoke part 2 moves through the nonmagnetic sheet member 5.

Further, as is apparent from the figure, the sheet member 5 is disposed only in the region of the joint portion that overlaps with the predetermined distance X, and in the portion where the yoke portion 2 and the leg portion 3 other than that are not overlapped, The magnetic body which consists of a directional silicon steel plate which respectively consists of the block 20 for yoke parts and the block 30 for legs exists. Therefore, as shown in Patent Document 1, the amount of the magnetic material per unit cross-sectional area in the iron core can be increased as compared with the case where the non-magnetic material is disposed on the entire surface of the block. As a result, the size and weight can be reduced.

Furthermore, in this embodiment, the yoke part block 20 and the leg part block 30 constitute the yoke part 2 and the leg part 3 by stacking 10 blocks. Therefore, the block at an appropriate position uses a directional silicon plate made of an isosceles trapezoid with a reference length of n-1 sheets, using the lowest directional silicon steel sheet whose length is a predetermined distance X or more. The steel plate 21 and the short directional silicon steel plate 22 are integrated by overlapping one end face. Thus, on the other end face side, the tip position of the directional silicon steel plate 22 having a short dimension is positioned on the near side by a predetermined distance X from the end portion of the yoke portion block 20. Therefore, when each

block

20 and 30 is piled up, the directionality silicon steel plate 22 with the short dimension takes the structure which does not exist in the overlap part in a junction part.

As a result, by disposing the sheet member 5 only in the region of the joint portion, the thickness (height) of the joint portion is bulky, and there is a space between the upper and lower blocks in the region other than the joint portion. By providing the short directional silicon steel plate 22, a part of the space can be filled, and the presence (occupation) ratio of the silicon steel plate can be further increased.
Although not shown, the same configuration may be adopted for the predetermined leg block 30 on the leg 3 side as well.

An iron core having such a configuration can be configured by the following procedure. First, silicon steel plates having a predetermined shape are prepared, and the

respective blocks

20 and 30 that are integrated by overlapping n pieces are prepared. Then, for example, the ten yoke portion blocks 20 are stacked while being alternately shifted in the longitudinal direction, and connected and integrated with bolts or the like to form the yoke portion 2 (FIG. 3A).

Insulating / non-magnetic sheet member 5 is arranged in the vicinity of both ends (actually, one each) of yoke portion 2 so as to cover (hide) the end face (FIG. 3B). Next, in order from the bottom, the tip of the leg block 30 that is disposed opposite to the sheet member 5 is inserted into the joint between the yoke blocks 20 (FIG. 3C). Along with this insertion work, the sheet member 5 is appropriately bent according to the end face shape of each of the

blocks

20 and 30 and is arranged in a continuous shape between the joint portion (connecting portion) of the yoke portion 2 and the leg portion 3. become. As described above, since the sheet member 5 is used as a non-magnetic material, the sheet member is arranged in a state where it is suspended in a position covering the end surfaces of the yoke part 2 and the leg part 3, and a predetermined block is pushed in order. Can be assembled.

In the above description, the yoke portion 2 is formed first, and the leg block 30 is appropriately attached thereto. However, the leg portion 3 may be manufactured first. . Of course, one of the yoke part 2 and the leg part 3 is not formed first, but the yoke part block 20 and the leg block 30 may be laminated and manufactured as appropriate.

Furthermore, in this embodiment, the sheet member 5 is used as the nonmagnetic material, but the present invention is not limited to this, and various nonmagnetic materials can be used. As an example, it can be realized by applying a non-magnetic paint to the joint. For example, as shown in FIG. 3A, when the yoke portion 2 is formed, a predetermined paint is applied to the tip end surface. Subsequently, an iron core can be manufactured by attaching the leg block 30 as appropriate. Since the coating material only needs to be applied to at least one side of the adjacent blocks to be joined, in the example shown in the figure, it is sufficient to apply the coating only to the leg 2 side. Of course, it is also possible to apply the paint to the tip of the leg block 30 and assemble it to the yoke part 2 without applying the paint to the yoke part 2 assembled in reverse.

FIG. 4 shows another embodiment. In this embodiment, the example applied to the frame type iron core for three phases is shown. That is, since it is for three phases, both ends of the central leg portion 4 are formed in an equilateral triangle shape at right angles, and a V notch 2a is formed at the center of one side of the yoke portion 2 joined thereto. Thereby, the junction part of the center leg part 4 and the yoke part 2 becomes V shape.

Also in the present embodiment, in the same manner as described above, not only the joint portion between the left and right leg portions 3 and the yoke portion 2 but also the joint portion (joint portion) between the central leg portion 4 and the yoke portion 2. A continuous insulating / non-magnetic sheet member 5 was disposed. A cross-sectional view at each joint is substantially the same as FIG. Also in this three-phase type, similarly to the above, a non-magnetic paint can be used instead of the sheet member.

Further, in each of the above embodiments and modifications, in the conventional frame-shaped iron core, each block often uses one silicon steel plate, but it remains by using n sheets as in this embodiment. It was confirmed that the magnetic flux density decreased and the effect of the decrease was increased as the number of the magnetic fluxes was increased.

FIG. 5 is a graph showing experimental results for demonstrating the effects of the present invention. FIG. 5A shows the characteristics of the magnetic flux density with respect to the excitation current by attaching a predetermined coil to a normal frame-shaped iron core (sheet member not inserted) as a comparative example. The number of silicon steel plates per block was N. The ratio of the residual magnetic flux density to the steady magnetic flux density is about 57%. FIG. 5B shows the magnetic flux density-excitation current characteristics of a frame-shaped iron core (sheet member not inserted) in which the number of silicon steel plates per block is increased (3N sheets). As the number of blocks per block is increased, the number of blocks to be stacked is reduced. Each of the frame-shaped iron cores is of the three-phase type shown in FIG.

As shown in the figure, the ratio of the residual magnetic flux density to the steady magnetic flux density is about 40%, which is reduced. FIG.5 (c) is a frame-shaped iron core of this embodiment, and while using what laminated | stacked 3N silicon steel plates per block shown in FIG.5 (b), a sheet | seat member is continuously connected to a junction part. The magnetic flux density-excitation current characteristics for the arranged ones are shown. As shown in the figure, the ratio of the residual magnetic flux density to the steady magnetic flux density when N sheets are reduced to about 20%, which is halved compared to the same iron core structure (3N sheets per block). I can confirm.

DESCRIPTION OF SYMBOLS 1 Iron core 2 Joint part 3 Leg part 4 Leg part 5 Sheet | seat member 20 Block 30 for a relay part Leg block

Claims

At least both ends of a yoke part made of a pair of magnetic materials are connected by leg parts made of a magnetic material, and each of the yoke part and the leg parts alternately has a plurality of strip-like blocks in the longitudinal direction. While laminating while shifting, in the frame-shaped iron core whose joint is inclined,
A frame-shaped iron core, characterized in that a nonmagnetic member is arranged in a state of being continuous with a joint portion that joins the yoke block and the leg block.
The frame type iron core according to claim 1, wherein the nonmagnetic member is a nonmagnetic sheet member.
The frame-shaped iron core according to claim 1, wherein the non-magnetic member is a non-magnetic paint applied thereto.
The frame-shaped iron core according to any one of claims 1 to 3, wherein the yoke portion block and / or the leg block are formed by stacking a plurality of silicon steel plates. .
At least one of the blocks configured by stacking the plurality of silicon steel plates is set so that a silicon steel plate located on one or both surfaces is short and does not overlap the seam portion. The frame-shaped iron core according to claim 4.
At least both ends of a yoke part made of a pair of magnetic materials are connected by leg parts made of a magnetic material, and each of the yoke part and the leg parts alternately has a plurality of strip-like blocks in the longitudinal direction. It is a method of assembling a frame-shaped iron core that is laminated while being staggered, and whose joint is inclined,
Stacking the block for the yoke part or the block for the leg part to form the yoke part or the leg part,
Next, a non-magnetic sheet member is arranged opposite to the side surface of the formed yoke part or the leg part,
A frame-shaped iron core, wherein a side surface of the leg block or the yoke portion block is inserted into a joint portion of the yoke portion or the side surface of the leg portion so as to push in the sheet member. Assembly method.