JP3189478U - Assembly structure of steel core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembled structure of a steel core with a strip-shaped iron core, which is related to a steel core for a static induction electric device such as a transformer or a reactor, and which incorporates the characteristics of a frame iron core. SOLUTION: The lower end edge portion of the upper yoke portion 1 and the upper end edge portion of the leg portions 3, 4, 5 are in contact with each other at a right angle without a gap, and the lower end edge portion of the leg portions 3, 4, 5 and the lower yoke portion 2 The upper edge of the sword is at right angles to each other without any gaps. The upper yoke portion 1 and the lower yoke portion 2 have different vertical lengths of the upper yoke portion 1 and the lower yoke portion 2 adjacent to each other in the thickness direction of the stack, and the upper yoke portion 1 and the lower yoke portion of each layer are different. In 2, the sum of the lengths in the vertical direction is the same. The upper yoke portion 1 and the lower yoke portion 2 are formed by selecting and combining three or more types of members having different lengths in the vertical direction. [Selection diagram] Fig. 1

Description

  The present invention relates to an iron core for a stationary induction electric appliance such as a transformer or a reactor, and relates to an assembly structure of the iron core that incorporates the characteristics of a frame iron core with an iron core formed in a strip shape.

As a structure of a stacked iron core such as a transformer, a strip shape, a frame shape (V notch shape), and the like are known.
In the case of a strip-shaped iron core, for example, as shown in FIG. 10, in the case of a three-phase tripod structure, one of the upper yoke portion 11 and the lower yoke portion 12 is equally divided into two and the central leg portion 15 is divided. The left and right leg portions 13 and 14 and the center leg portion 15 are set to the same length.
That is, in one combination shown in FIG. 10A, the upper portion of the central leg portion 15 is inserted between the divided upper yoke portions 11 ′ and 11 ′, and the lower portion is mounted on the upper center of the series of lower yokes 12. The left and right leg portions 13 and 14 are disposed so as to abut the lower surfaces of the upper yoke portions 11 ′ and 11 ′ whose upper ends are divided, and the lower portions are in contact with the left and right side surfaces of the lower yoke portion 12 from the outside. ing.
In the combination of 2 shown in FIG. 10 (b), the lower part of the central leg is inserted between the divided lower yoke parts 12 ′ and 12 ′, and the lower end of the upper yoke 11 with the upper end extending in series is abutted. The left and right leg portions 13 and 14 are placed on the upper surfaces in the left and right direction of the divided lower yokes 12 ′ and 12 ′, and the upper portions are arranged so as to come into contact with the left and right side surfaces of the upper yoke portion 11 from the outside. Is done.
The iron core of the combination 1 and the iron core of the combination 2 have the same outer peripheral shape and inner peripheral shape. By alternately and repeatedly stacking these, the strip-shaped cores are assembled in multiple layers.
However, in the above configuration, the joint surfaces where the mating surfaces of the yoke portions 11 (11 ′) and 12 (12 ′) and the leg portions 13 to 15 in each layer are perpendicular to each other have four vertical surfaces and horizontal surfaces. It is necessary to put all the surfaces of the yoke part and the leg part together at the same time and press it down with a constant force when assembling. However, if the force is applied from above and below, the left and right leg parts will shift to the outside. For example, it is difficult to assemble all the joint surfaces without gaps.
In addition, the stacked iron core for static induction electric appliances disclosed in Japanese Patent Application Laid-Open No. 2013-48138 includes at least two or more core legs that wind the windings, and upper and lower yokes that magnetically couple between the core legs. In the iron core for static induction electric appliances, each of the core legs is formed by laminating using a laminate unit in which a predetermined number of amorphous alloy ribbons are laminated, and at least the upper yoke of the upper and lower yokes is A structure in which silicon steel plates are laminated and the laminated joints between the iron core legs and the upper and lower yokes are alternately laminated is disclosed, but it is necessary to limit the material of the iron core legs and the yokes It lacks versatility.
Next, in the frame-shaped (V-notch-shaped) core shown in FIG. 11, a V-notch 26 is formed at the center of the upper and lower yoke portions 21, 22, and both upper and lower ends of the center leg portion 25 are fitted into the V-notch 26. The left and right ends of the upper and lower yokes 21 and 22 and the upper and lower ends of the left and right leg portions 23 and 24 form an inclined surface of approximately 45 degrees and are combined to form a right angle. Has been.
In each layer to be stacked, for example, three types of upper and lower yoke parts are prepared by shifting the positions of the holes so that the positions of mounting holes (not shown) drilled in the upper and lower yoke parts 21 and 22 are slightly different. The center leg portion 25 and the left and right leg portions 23 and 24 have the same shape, so that the positions of the mounting holes are slightly between the first layer, the second layer, and the third layer. It has a shifted configuration.
Thereby, since it is necessary to match all the inclined surfaces at the joint surfaces of the yoke portions 21 and 22 and the leg portions 23 to 25, it is complicated and troublesome to align the joint surfaces without any gaps. Yes.
Further, for example, in the frame-shaped iron core and the assembly method thereof disclosed in Japanese Patent Application Laid-Open No. 2010-287756, both ends of a yoke portion made of a pair of magnetic bodies are connected to each other by leg portions made of a magnetic body. Each leg part is a plurality of strip-like blocks stacked alternately while being shifted in the longitudinal direction, and the joint part is a frame-shaped iron core inclined by 45 degrees. The joint part block and leg part block are joined together. A configuration in which a nonmagnetic sheet member is arranged in a state of being continuous with a joint portion is disclosed. In this case, it is necessary to dispose a nonmagnetic sheet member at the joint portion.

JP 2013-48138 A JP 2010-287756 A

  This device was devised in view of the above circumstances, and its main problem is that the surface where the upper and lower yoke portions and the leg portions are joined is a joint in which the other is always perpendicular to one extending direction. In addition to being able to closely contact the surface without gaps, and stacking the upper and lower yokes of the strip shape in the direction of the thickness of the iron core, the product is designed to reduce leakage flux, reduce loss, reduce noise, and reduce vibration. It is to provide an assembly structure of an iron core.

In order to achieve the above object, the device of claim 1
At least a pair of left and right vertical legs with the same length in the vertical direction between the horizontally long rectangular upper yoke and the upper yoke with the same horizontal length as the rectangular lower yoke. In a strip-shaped core structure with
The lower end edge of the upper yoke part and the upper end edge of the leg part collide with no gap, and the lower end edge part of the leg part and the upper end edge of the lower yoke part collide with no gap,
The upper yoke portion and the lower yoke portion have different vertical lengths in the front and rear adjacent upper yoke portions and the lower yoke portion in the stacking thickness direction, and the upper yoke portion and the lower yoke portion in each layer have a vertical length. The sum of the same is the same,
The upper yoke portion and the lower yoke portion are formed by selecting and combining three or more types of yoke members having different longitudinal lengths.

The surfaces where the upper and lower yoke portions and the leg portions, which are made of a rectangle, are joined to each other are always joined at right angles to the extending direction of one of the yoke portions or the leg portions, so that they can be brought into close contact with each other without a gap. The magnetic resistance is reduced, local heating is not generated, and power loss can be reduced.
In addition, the upper and lower yoke portions have a one-piece structure extending in the horizontal direction, and the vertical width of each layer in the thickness direction is changed stepwise so that the joint between the yoke portion and the leg portion is shifted for each layer. Can be arranged, and a stacked structure (step wrap) is possible, and low noise and low loss are achieved by dispersing the disturbance of magnetic flux flow.
Furthermore, since the joint surface is a simple mating surface from one direction, it is easy to closely contact the gap between the joint surfaces, and workability during assembly can be improved.

The front view of the iron core of three different layers of the rectangular iron core of the three-phase tripod structure of Example 1 is shown, (a) is the first layer, (b) is the second layer, (c) is the third layer It is. It is a front view of three kinds of yoke parts and one kind of leg parts from which vertical length used as upper and lower yoke parts for forming 1-3 layers is different. It is sectional drawing of a steel core. It is a front view of five kinds of yoke parts and one kind of leg parts with different vertical lengths used as upper and lower yoke parts for forming five kinds of layers. The front view of the iron core of the three different layers of the strip-shaped iron core of the two-phase structure of Example 2 is shown, (a) is the first layer, (b) is the second layer, (c) is the three layers Eyes. It is a front view at the time of providing the attachment hole of 0-3 in a yoke part. It is a front view at the time of providing the attachment hole of 0-3 in a leg part. The front view of the iron core of the three different layers of the strip-shaped iron core with a gap is shown, (a) is the first layer, (b) is the second layer, and (c) is the third layer. It is sectional drawing of the product iron core of FIG. It is a front view which shows the conventional strip-shaped iron core, (a) is the 1st layer, (b) is the 2nd layer. It is a front view which shows the conventional frame-shaped iron core.

  The surface where the upper and lower yoke parts and the leg part are joined can be brought into close contact as a T-shaped joining surface that is always perpendicular to the extending direction, and the strip-shaped iron core is shifted in the thickness direction of the iron core. However, by laminating, the reduction of leakage magnetic flux, low loss, low noise and low vibration was realized.

In the strip-shaped core 10 having the three-phase tripod structure shown in FIGS. 1 to 3, two of the three types of yoke portions Y1 to Y3 shown in FIG. The leg member L has a combination of left and right leg portions 3 and 4 and a central leg portion 5.
That is, the three types of yoke portions Y1 to Y3 have three types of first to third yoke members Y1 to Y3, the horizontal length of which is the same as the horizontal length of the iron core, and the vertical length is divided into three stages. A large number of parts are prepared and formed by combining them.

That is, in the present embodiment, the vertical length a of the second yoke member Y2 is set to half the total of the vertical lengths (2a) of the upper and lower yoke portions 1 and 2.
The first yoke member Y1 is set to a length b shorter than the second yoke member Y2, and the first yoke member Y1 is determined from the total length (2a) of the upper and lower yoke portions 1 and 2. The length (2a-b) obtained by subtracting the vertical length (b) is set to the vertical length is defined as a third yoke member Y3.

At this time, the vertical length difference between the first to third yoke members is preferably set to the same or substantially the same length difference.
Then, two yoke parts having the same total vertical length are selected from the three types of yoke parts of the first to third yoke members Y1 to Y3, and the upper and lower yoke parts 1 and 2 are Y1 and Y3. , Y2 and Y2, and Y3 and Y1 are used in combination.

  Accordingly, in FIG. 1 (a), the upper yoke portion 1 is the first yoke member Y1, and the third yoke member Y3 is the lower yoke portion 2. In FIG. 1 (b), the upper yoke portion 1 and the lower yoke portion 2 are combined. 1C. In FIG. 1C, the upper yoke portion 1 is the third yoke member Y3, and the first yoke member Y1 is the lower yoke portion 2. ing.

Then, the three types of iron cores having different vertical lengths of the upper and lower yoke portions 1 and 2 are sequentially stacked in the thickness direction, and this is repeated to form the stacked iron core 10 (see FIG. 3).
In the illustrated example, the case where the upper yoke portion 1 is in the order of Y1, Y2, and Y3 and the lower yoke portion 2 is stacked stepwise in the order of Y3, Y2, and Y1 is illustrated. The longitudinal lengths of the upper yokes adjacent to each other and the lower yokes only need to be different from each other, and the order of combination is not limited to the illustrated example.

The first leg member L is a vertically oriented rectangle, and one type is prepared, and is interposed between the upper yoke portion 1 and the lower yoke portion 2 vertically.
That is, in the present embodiment, the left and right leg portions 3 and 4 and the center leg portion 5 are all inserted into a product core, and the first leg member L is used for both.

Since each of the first to third yoke portions Y1 to Y3 and the first leg member L is made of a rectangle, each side is horizontal or vertical. The joint surfaces S1 to S6 with the respective leg portions 3 to 5 are configured so as to always contact at right angles with no gap.
In the present embodiment, each layer of the core product 10 is assembled by sequentially and continuously manufacturing in the direction of the thickness of the core as one set of the three types of configurations with different positions of the joint surfaces as described above. It is done.
In the case shown in FIG. 3, two pieces of the same combined iron cores are used for each type, but one may be used, or three or more may be used as long as the effect is not impaired. .

As a result, as a result of manufacturing an inverter leakage transformer (capacitance 210 kVA, 260 kVA) adopting the above iron core structure and conducting an evaluation test with a conventional product, the expected characteristics were obtained, and the noise level at the commercial frequency -It was confirmed that there was a large difference in the excitation current value increase curve when the input voltage was increased compared to the conventional product.
In addition, we were able to confirm the superiority in noise value and excitation current value in the power supply from the inverter.
In particular, in the above-described embodiment, it was confirmed that when the commercial frequency power supply is used, the noise is as low as 52 dB when the rated input voltage is 630 V, and there is a noise value difference of about 10 dB or more compared to the conventional product.

  In this embodiment, three types of first to third yoke members Y1 to Y3 are used. However, the total length of the two yoke portions is the sum of the upper and lower yoke portions 1 and 2 of the iron core to be assembled (the iron core). 2 or more, more preferably, three or more types of yoke portions may be prepared.

FIG. 4 shows an example using five types of first to fifth yoke portions Y1 ′ to Y5 ′.
In this case, the vertical length A of the third yoke member Y3 ′ is used as a reference, and this double is the sum of the vertical lengths of the upper and lower yoke portions 1 and 2.
The vertical length of the first yoke member Y1 ′ is set to the shortest B, and the vertical length of the second yoke member Y2 ′ is set to an intermediate length C between the first yoke member Y1 ′ and the third yoke member Y3 ′. The vertical length of the fourth yoke portion Y4 ′ is set to 2A-C, and the length of the fifth yoke portion Y5 ′ is set to 2A-B.

As a result, the vertical lengths of the upper and lower yoke portions 1 and 2 are different from each other in five types (Y1 ′ and Y5 ′, Y2 ′ and Y4 ′, Y3 ′ and Y3 ′, Y4 ′ and Y2 ′, Y5 ′ and Y1 ′). ) Iron core (not shown).
As described above, when providing a yoke part having a length that is half the sum of the vertical lengths of the upper and lower yoke parts 1 and 2, one type of iron core is combined, so the number of parts is reduced, which is preferable. In this device, it is not necessary to use a yoke portion having a half length.
In that case, it is only necessary that the sum of the vertical lengths of the pair of yoke portions that are always parts matches the vertical length of the upper and lower yoke portions 1 and 2, and the number of types is not limited.

FIG. 5 shows a strip-shaped iron core 10 having a one-phase two-legged structure.
Also in this case, as in the first embodiment, three types of first to third yoke members Y1 to Y3 having three stages of vertical lengths (b, a, 2a-b) and one type of first leg member are used. The case where L is used as a component will be exemplified (see FIG. 2).
This stacked iron core 10 has a combined configuration in which two of the three types of yoke portions Y1 to Y3 are the upper and lower yoke portions 1 and 2, and one type of first leg member L is the left and right leg portions 3 and 4. Become.
That is, the configuration is the same as that of the first embodiment except that the central leg 5 is omitted.

Therefore, in FIG. 5A, the upper and lower yoke portions 1 and 2 are a combination of Y1 and Y3, in FIG. 5B, a combination of Y2 and Y2, and in FIG. 5C, a combination of Y3 and Y1.
Further, there are four joint surfaces, S1 to S4, which are in contact with each other at a right angle.
Further, the cross section of the iron core is the same as that shown in FIG.
Since other configurations are the same as those of the first embodiment, the description thereof is omitted.

In the said Example, although the case where the 1st-3rd yoke members Y1-Y3 used as components each did not have one kind of attachment hole, respectively, the attachment hole is provided in each of each 1st-3rd yoke member Y1-Y3. A plurality of types of yoke portions with different numbers of H may be prepared.
By setting each mounting hole H at a position separated by a certain length from the upper side or the lower side of the first to third yoke members, the mounting holes can be aligned in each yoke portion Y1 to Y3.

In FIG. 6, four types of three mounting holes H are shown in the third yoke member Y3: two, two, one, and none, but the number of mounting holes is not limited to the above example.
By preparing different types of mounting holes in this way, it can be used properly depending on the specification product.

The same applies to the first leg member L. As shown in FIG. 7, a plurality of types of first leg members L1 with different positions of the mounting holes H may be used.
In the illustrated example, by preparing four types of mounting holes H, those having three, two, one, and none, they can be selectively used depending on the specification product.
Since other configurations are the same as those in the above embodiment, the description thereof is omitted.

FIGS. 8-9 shows the case where the structure of the product core of Example 1 is replaced with the product core with a gap.
In this embodiment, a surface (gap) G for inserting a gap material is formed at an intermediate position between the leg portions 3 to 5.
Since the surface G into which the gap material is inserted needs to be aligned on the same continuous surface in the thickness direction of the stacked iron core, the pair of upper and lower leg portions sandwiching the surface G is composed of the upper and lower yoke portions 1 and 2. It is necessary to prepare three kinds according to.

That is, the second leg component piece L2 is set to a length obtained by dividing the length of the first leg member L excluding the gap surface G into two equal parts, and the first leg component piece L1 is the second leg component. The length of the third yoke member Y3 and the first yoke member Y1 is set longer than the length of the piece L2.
Further, the third leg component piece L3 is set shorter than the second leg component piece L2 by a difference in length in the vertical direction between the third yoke member Y3 and the first yoke member Y1.
Thus, each leg part 3-5 is comprised combining 1st leg member structural piece L1-3rd leg part structural piece L3 corresponding to the combination of the upper and lower yoke parts 1,2.

  Therefore, in the case of the three-phase tripod structure shown in FIG. 8, when the upper yoke portion 1 is the first yoke member Y1 and the third yoke member Y3 is the lower yoke portion 2 in FIG. , A combination of the upper first leg member constituting piece L1 and the lower third leg constituting piece L3, and a surface for inserting a gap material between the first leg member constituting piece L1 and the third leg constituting piece L3 (gap ) Is formed.

  In FIG. 8B, when the upper yoke portion 1 and the lower yoke portion 2 are the second yoke member Y2, each leg portion is a combination of a pair of upper and lower second leg portion constituting pieces L2, and the upper and lower second A surface (gap) G into which the gap material is inserted is formed between the two leg component pieces L2.

  In FIG. 8C, when the upper yoke portion 1 is the third yoke member Y3 and the first yoke member Y1 is the lower yoke portion 2, each of the leg portions 3 to 5 is the upper third leg portion constituting piece L3. And a first leg member constituting piece L1 in the lower tier, and a surface G for inserting a gap material is formed between the third leg member constituting piece L3 and the first leg member constituting piece L1.

In addition, in the case of a one-phase two-leg structure (not shown), the structure is the same as that described above except that the leg portion is not provided at the center of the yoke portion.
Similar to the embodiment of FIG. 6 and FIG. 7, if a kind in which a plurality of mounting holes are provided from 0 to the yoke part and / or the leg part (leg part constituting piece) is prepared, it can be appropriately adapted to the specification product. Can be used properly.
Also in this case, the number of mounting holes is not limited to the above-mentioned embodiment, and can be determined from 0 to a plurality.

This device can be used not only as a three-phase transformer and a single-phase transformer but also as a core for reactors.
In addition, it goes without saying that various design changes can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Upper yoke part 2 Lower yoke part 3,4 Left and right leg part 5 Center leg part 10 Stacked iron cores 11, 11 ', 21 Upper yoke part (conventional)
12, 12 ', 22 Lower yoke part (conventional)
13, 14, 23, 24 A pair of left and right legs (conventional)
15, 25 Center leg (conventional)
G side (gap)
H mounting hole L first leg member L1 first leg component piece L2 second leg component piece L3 third leg component piece Y1 first yoke member Y2 second yoke member Y3 third yoke member S1 to S6

Claims (5)

At least a pair of left and right vertical legs with the same length in the vertical direction between the horizontally long rectangular upper yoke and the upper yoke with the same horizontal length as the rectangular lower yoke. In a strip-shaped core structure with
The lower end edge of the upper yoke part and the upper end edge of the leg part collide with no gap, and the lower end edge part of the leg part and the upper end edge of the lower yoke part collide with no gap,
The upper yoke portion and the lower yoke portion have different vertical lengths in the front and rear adjacent upper yoke portions and the lower yoke portion in the stacking thickness direction, and the upper yoke portion and the lower yoke portion in each layer have a vertical length. The sum of the same is the same,
The stacked iron core structure is characterized in that the upper yoke portion and the lower yoke portion are formed by selecting and combining three or more types of yoke members having different longitudinal lengths.   A one-phase two-leg structure in which the iron core has a pair of left and right legs between the upper yoke part and the lower yoke part, or a three-phase tripod structure with legs in the left and right and center between the upper yoke part and the lower yoke part The product core structure according to claim 1, wherein   The upper yoke portion and the lower yoke portion are each an intermediate member having a length that is equally divided into two in a predetermined vertical direction, and one or more long members having a length different from the vertical length of the intermediate member; Selecting one or a plurality of short members obtained by subtracting the vertical length of the long member from the predetermined vertical length so that the sum of two members becomes the predetermined vertical length; The core structure according to claim 1 or 2, wherein the upper yoke portion or the lower yoke portion is combined with the other at the lower yoke portion or the upper yoke portion. The leg is composed of a leg component piece divided into two so that a gap is formed at an intermediate position,
The leg component pieces have a plurality of lengths corresponding to the longitudinal lengths of the upper yoke portion and the lower yoke portion so that the positions of the gaps of the iron cores of each layer are the same surface in the thickness direction of the stacking. The core structure according to any one of claims 1 to 3, wherein the leg component pieces are selected and combined.   A plurality of members having different mounting holes and different numbers are prepared for members used for the upper and lower yoke portions or leg portions, and a member having a predetermined mounting hole is selected according to a specification product. The stacked iron core structure according to any one of 1 to 4.

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