JPS6194308A - Laminated iron core - Google Patents

Abstract

PURPOSE:To obtain a laminated iron core which has smaller magnetic reluctance at a junction by joining in mutually reverse direction laminated blocks wherein plural amorphous magnetic alloy plates are laid sliding to the longer direction one by one and the angle of the end slope is set at a specific value. CONSTITUTION:The yoke 11 and the leg 12 of a laminated iron core are joined perpendicularly and the laminated iron core for a transformer, etc. is made. In this construction, the yoke 11, e.g., has two laminated blocks 13 laid one upon another and the leg 12 has also two laminated blocks 14 laid one upon another. These blocks 13 and 14 are made laminating plural amorphous magnetic alloy plates 15, both the end surfaces 13a and 14a are shifted to the longer direction and the slope angle theta at the end is made to satisfy tantheta=0.05-0.25. Simultaneously, the end surfaces 13a and 14a are joined to make reverse slopes face to face, the gap between these end surfaces is made smaller and the magnetic reluctance against passing magnetic flux is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a laminated iron core formed by laminating amorphous magnetic alloy thin plates.

[Technical background of the invention and its problems]

A laminated iron core, which is generally used in transformers and the like, is a complete combination of a silicon iron part and a leg part made of laminated magnetic plates, and conventionally silicon steel plates have been used as the magnetic plates. In order to obtain good magnetic properties in a laminated core, it is necessary to create a structure with low magnetic resistance at the joints that join each end face of the silicate iron part and the leg part. When is a plane extending in the stacking direction, a gap is created between the end faces over the entire stacking direction, increasing magnetic resistance. For this reason, a stepped stacked structure (step 2 seal) has conventionally been adopted as a structure of the joint portion with the lowest magnetic resistance.

FIG. 6 shows the structure of this joint. The silicon steel part 1 and the leg part 2 are formed by laminating a plurality of silicon steel plates 3.4 with their positions sequentially shifted in the longitudinal direction one by one. Then, the end portions of the silicon steel plate 3 and the end portions of the silicon steel plate 4 are stacked in a stepped manner and butted against each other to join each end surface of the silicon iron portion 1 and the leg portion 2. In the structure of this joint, a large part of the magnetic flux φ out of the magnetic flux components flowing between the opposing silicon steel plates 3 and 40 flows through the adjacent silicon steel plates 3 and 4f on both sides.
Since the magnetic flux φ flowing through the air gap 5'fr formed between the end surfaces of the silicon steel plates 3 and 4 is small, the magnetic resistance is small.

Incidentally, an amorphous magnetic alloy thin plate with excellent magnetic properties has recently been developed, and attempts have been made to manufacture a laminated iron core using this material. This amorphous magnetic alloy thin plate is manufactured by ultra-quenching a molten magnetic alloy and is extremely thin, and has excellent low loss characteristics. However, when manufacturing a laminated iron core by laminating amorphous magnetic alloy thin plates, these thin plates are very thin, so if they were laminated one by one like silicon steel plates, it would take a lot of man-hours to make it practical. In order to prevent this from occurring, several tens of thin strips 1 are laminated and fixed to form a laminated block, and a plurality of these laminated blocks are superposed to form the iron core.

In order to obtain good magnetic properties even in a laminated core made of amorphous magnetic alloy ribbons, the structure of the joint between the silicon part and the leg part is changed to a stepped overlap joint as shown in Fig. 7. It is possible to do so. That is, the flat iron part l and the leg part 2 are made of a plurality of, for example, ten amorphous magnetic alloy ribbons 61! - It is formed by stacking a plurality of sets of laminated blocks 7.8 which are stacked and fixed and are sequentially shifted in the longitudinal direction. Then, the end surfaces of the silicate iron part 1 and the leg part 2 are joined to each other by stacking the end parts of each laminated block 7.8 in a stepped manner and butting them against each other.

However, this joint configuration has the following problems. Since the laminated block is made by laminating a large number of amorphous magnetic alloy thin plates, it is difficult for magnetic flux to flow in the lamination direction. Therefore, out of the magnetic flux flowing between the laminated blocks 7.8, the magnetic flux on both sides of the laminated blocks 7.8! The amount of magnetic flux φ flowing through the R-layer block 7 or 8 as a side path decreases, and the amount of magnetic flux φl flowing between the end faces of the laminated blocks 7 and 8 increases. Since a gap 9 inevitably exists between the end faces of the laminated block 7.8, the existence of this gap 9 causes the magnetic flux φ,
Magnetic resistance to increases. Therefore, even if a stepped overlap joint is adopted for the structure of the joint between the silicate iron part and the leg in a laminated core made of amorphous magnetic alloy thin plates, the magnetic resistance of the joint cannot be reduced, and the magnetic properties of the entire core cannot be reduced. Therefore, there has been a demand for the development of a new joint structure that can reduce the magnetic resistance of the joint.

Therefore, a plurality of amorphous magnetic alloy thin sheets are stacked one after another in a state shifted in the longitudinal direction to form a laminated block having an inclined end face, and these laminated blocks are placed in the iron core silica part and the iron core leg part, respectively. A laminated core has been proposed in which the end faces of each laminated block are joined in opposite directions.

The laminated core of this configuration is intended to increase the closeness between the sea surfaces of the laminated blocks by tightening the core, almost eliminating air gaps, and reducing the magnetic resistance between the end faces of the laminated blocks. However, since the end faces of the laminated blocks are microscopically stepped, the end faces of each laminated block may not be properly joined due to the influence of force when tightening, resulting in variations in characteristics. There were many.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and is an amorphous magnetic alloy thin plate having excellent magnetic properties with low magnetic resistance at the joint between the silicate iron part and the leg part even when subjected to stress such as clamping force. The purpose is to provide a laminated core consisting of:

[Summary of the invention]

In the laminated core of the present invention, a plurality of amorphous magnetic alloy thin plates are laminated in a state in which they are shifted in the longitudinal direction to form a laminated block having an inclined end face, and this laminated block is connected to the core, the iron part and the core legs. The inclination angle θ of the end faces of the laminated blocks is set to a value of −=0.05 to 0.25 when the end faces of the laminated blocks are placed in each section and joined with the end faces of the laminated blocks facing oppositely to each other. be.

[Embodiments of the invention]

The embodiment shown in the drawings of the present invention will be described below.

FIG. 1 and FIG. 2 are a plan view and a sectional view showing an embodiment of a joint between a steel part and a leg part in a laminated iron core of the present invention. In the figure, reference numeral 11 indicates a silicate iron portion of the laminated iron core, and numeral 12 indicates a leg portion that joins this silica portion 11 at right angles. Yes, Tetsubu I
For example, I is constructed by stacking two sets of laminated blocks IJ, 13t, and the leg portion 12 is constructed by stacking two sets of fλ layered blocks 1414. These laminated blocks 13 and 14 are made of K, for example, 50 amorphous magnetic alloy thin plates 1st-laminated, as shown in FIGS. 3 and 4.
One amorphous magnetic alloy thin plate z5 has a length of a steel part 11 and a leg part 12, and is formed by cutting both edges at an angle of 45''.Amorphous magnetic alloy Thin A15 is 1
The sheets are stacked one after another with the sheets shifted in the longitudinal direction.

For this reason, both longitudinal end surfaces 13a, 13a and 14B, 14a of each laminated plotter 13.14 are formed as inclined surfaces inclined at a predetermined angle with respect to the ribbon lamination direction. That is, the laminated blocks 13 and 14 have a side surface shape of a parallelogram.

Note that each laminated block 13, 14 is fixed by bonding both longitudinal ends of each laminated amorphous magnetic alloy thin plate 15 with an adhesive. In this case, the inclination angle θ of the end faces 13a and 14H of the laminated blocks 13.14 is set to a value such that the tangent value, ie, 10, falls within the range of 0.05 to 0.25. And two sets of laminated blocks 1j, 13t-both end faces 13a.

The flat iron part 11 is constructed by aligning the directions of the blocks 13a and stacking them, and the two sets of laminated blocks l4, 14'Ik end face J4a
, 74a are aligned and stacked to form the leg portion 12,
In addition, the end face 13a of each laminated block 13.13 at the joint where the stub iron part 11 and the leg part 12 intersect at right angles and join together.
, 13B and the end faces 14a, 14 of the laminated block 14.14
a and are butted and joined. In this case, the end faces 13a of the stacked blocks 13 and the end faces J4a of the stacked blocks 14 located in the same stacked stage are joined by butting each other from above and below with their respective inclinations reversed. For this reason,
The joining line between y8m13a and the end surface 14B is inclined with respect to the direction of the thin layer. In this case, the end surface 13a and the end surface 14a are joined at an inclination angle θ. .

Also, the laminated block 13.13 which is the silicate part II, the laminated block 14.14 which is the leg part 12, and the silicate part 1
The laminated block 13 is joined at the joint between 1 and the leg 12.
．． 13 and each end of the laminated block 14.14 are secured by clamp plates and tightening bolts (not shown) from both sides in the lamination direction of the thin plates. In this case, the end faces 13a, Ism of the laminated blocks 13.13 and the end faces 14a of the laminated blocks 14, 14 that are joined to each other at the joint portion
, 14a are tightened from both sides in the stacking direction, and are pressed by force and brought into close contact with each other to join. That is, the end faces 13a of the laminated blocks 13, 13.

13a and the end faces 14a of the am blocks 14,14.

14a are inclined in the stacking direction, so when pressed against each other with a slight force in the stacking direction, the end faces 13a,
The gap created between 14B can be made very small.

Therefore, the end face isa of the laminated block 13.13.

13a and the end face 14a of the laminated block 14.14.

The end face 13a at the butt portion with the end face 14a.

The magnetic resistance to the magnetic flux φ1 passing between 13a, 14a, and 14a becomes very small.

Here, the reason why the inclination angle θ of the end face of the laminated blocks 13, 14 is converted into a tangent value and set to be in the range of 10=0.05 to 0.25 will be explained. The present inventor assembled several types of laminated cores using six laminated blocks each having six different inclination angles θ of the end face, and measured the iron loss of each of these laminated cores. The number of amorphous magnetic alloy thin plates that make up each laminated block is 330xt! cIθ, for example −
In the case of θ; 0.15, 50 T-thin plates were laminated to form a set of laminated blocks. Figure 5 shows the building factor expressed as the ratio of the core loss value measured for each laminated core to the cumulative material properties of the amorphous magnetic alloy thin plate, and the magnitude of the end face inclination angle θ of the laminated block. FIG. According to this diagram, the value of 10 is 0.05 to 0.
25, it can be seen that the core loss of the laminated core is the smallest and exhibits good magnetic properties. This means that if the end face inclination angle θ of the laminated blocks exceeds -θ; 0.25, the end of the amorphous magnetic alloy thin plate in one of the laminated blocks will be affected by the tightening force. This seems to be because a relatively large gap is created at the joint part, which is offset from the end of the amorphous magnetic alloy thin plate in the other laminated block to be joined.

In addition, if the end face inclination angle θ is less than 10 = 0.05, it is unlikely that the ends of the corresponding amorphous magnetic alloy thin plates will be misaligned, but the tightening force is This seems to be because it acts to deform the edge of the magnetic alloy thin plate, causing magnetostriction in the amorphous magnetic alloy thin plate, which is highly sensitive to stress.

On the other hand, the end face inclination angle θ of the laminated block is 10=0.
When the size is set in the range of 0.05 to 0.25, the tightening force is appropriately distributed at the joints between the end faces of the stacked blocks, causing misalignment between the ends of the amorphous magnetic alloy thin plates. This is because it is less likely to be moved or deformed.

Hence the laminated blocks! 3.14 end face 13a.

By setting the inclination angle θ of 14a to a size in the range of 10=0.05 to 0.25, the laminated block 13.14
The magnetic resistance at the joint between the end surfaces 13B and 142 can be greatly reduced.

In addition, if only the both ends of the laminated blocks 13 and 14 are fixed with adhesive as in the example, the laminated blocks 13.1
Since the both ends of 4 are the parts where the full amount of tightening force is easy, the deformation of the amorphous magnetic alloy thin plate 15 during tightening can be further reduced, and the other parts of the amorphous magnetic alloy thin plate 15 are bonded with adhesive. As a result, stress is less likely to be applied, and deterioration of magnetic properties can be suppressed.

[Effects of the Invention] As explained above, according to the present invention, at the joint between the silicate iron part and the leg part where the laminated block formed by laminating amorphous magnetic alloy thin plates is arranged, the end faces of the laminated block are f:
By joining them in an inclined state at an inclination angle within a certain range, it is possible to obtain a laminated core with improved magnetic properties by reducing the magnetic resistance at this joint.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention,
Figure 1 is a plan view showing the joint between the silicate iron part and the leg part of the laminated iron core, Figure 2 is a cross-sectional view along the line 1 - - 1, and Figures 3 and 4 are the laminated blocks. Fig. 5 is a diagram showing the relationship between the building factor and the end face inclination angle of the laminated block in a laminated core, and Figs. 6 and 7 show the silicate iron part and legs in a conventional laminated core. FIG. 11... Silica iron part, 12... Leg part, 13.14...
・Laminated block, 13a, 14m...end surface, 15...
・Amorphous magnetic alloy thin plate, θ...end face inclination angle. Applicant's representative Patent attorney Takehiko Suzue Figure 2 Figure 3 Figure 5 janθ

Claims (1)

[Claims] A plurality of amorphous magnetic alloy thin plates are laminated in a state in which they are shifted in the longitudinal direction, and the inclination angle θ of the inclined end face is tan.
Laminated blocks having a size of θ = 0.05 to 0.25 are placed on the iron core portion and the iron core leg portion, respectively, and the end faces of the laminated blocks are joined in opposite directions to each other. Laminated core.