JPS61180407A - Wound core - Google Patents

Abstract

PURPOSE:To reduce the magnetic resistance at the junction part of the titled wound core by a method wherein both end faces of the laminated body of an amorphous magnetic alloy thin strip are butt-jointed by forming said end faces into the reverse-directioned surfaces inclined in the circumferential direction of an iron core, and their angle is set in the range of tantheta=0.05-0.20. CONSTITUTION:A wound core is formed by concentrically assembling amorphous magnetic alloy thin strip laminated bodies 11, 12 and 13. The laminated bodies 11-13 are formed by laminating a rectangular ring-shaped amorphous magnetic alloy thin strips 14 having different circumferential lengths cut by one turn according to each turn of the wound core, and the amorphous magnetic alloy thin strips 14 are assembled in such a manner that the cut position is shifted in microscopical length in the circumferential direction of the core. At this point, when the angle to be held between the junction part of the end face 11a of the laminated body and the amorphous magnetic alloy thin strip 14 is set at theta, the size of said angle theta is established in the range of tantheta=0.05-0.20.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a wound core made of an amorphous magnetic alloy ribbon.

[Technical background of the invention and its problems]

A one-turn cut type wound core is used as an iron core for transformers, reactors, etc. This wound core is made by winding a magnetic metal strip (previously a silicon steel strip) cut at each turn with a predetermined number of turns so that the cut positions are shifted stepwise in the circumferential direction. . In addition, this wound core has a stepped stacked structure in which the magnetic metal strips are joined at different positions in a stepped manner for each turn, so the magnetic resistance is lower than that of C-force and T-shaped wound cores. It is widely used because of its excellent magnetic properties.

Incidentally, an amorphous magnetic alloy ribbon with excellent magnetic properties has recently been developed, and attempts have been made to manufacture a one-turn cut type wound core using this material. This amorphous magnetic alloy ribbon is extremely thin and manufactured by ultra-quenching a molten magnetic alloy, and has excellent low-loss characteristics.

Therefore, even when manufacturing a one-piece wound core made by winding amorphous magnetic alloy ribbons, the joints of the wound amorphous magnetic alloy ribbons can be made in the same way as in conventional wound cores. It is conceivable that the structure may be a stepped stacked structure as shown in FIG. That is, a plurality of sets of laminates 2 made up of a plurality of turns of amorphous magnetic alloy ribbons 1 are wound with shifts in the circumferential direction of the winding core, and the ends of each laminate 2 are overlapped in a stepwise manner and butted. Especially to join.

However, this joint configuration has the following problems. Since the laminate is made by laminating a large number of amorphous magnetic alloy ribbons, it is difficult for magnetic flux to flow in the lamination direction. Therefore, among the magnetic fluxes flowing between the stacked bodies 2, it becomes difficult for the magnetic flux to flow through the stacked bodies 2 on both sides of the stacked bodies 2 as a bypass path. Therefore, the amount of magnetic flux flowing between the end faces of the laminate 2 increases.

However, since a gap 3 inevitably exists between the end faces of the laminate 2, the presence of this gap 3 increases the magnetic resistance to the magnetic flux. Therefore, even if stepped lap joints are adopted for the joint structure of the laminated bodies in wound cores made of amorphous magnetic alloy ribbons, the magnetic resistance of the joints cannot be reduced and the magnetic properties of the entire core cannot be improved. do not have.

[Purpose of the invention]

The present invention solves the above-mentioned problems, and aims to provide a one-turn cut-shaped wound core made of an amorphous magnetic alloy ribbon and having excellent magnetic properties.

[Summary of the invention]

The wound iron core of the present invention is produced by laminating a large number of amorphous magnetic alloy ribbons cut every turn to form an annular shape in a concentric manner with cutting positions shifted in the circumferential direction of the core. Both end surfaces of a laminated body of thin ribbons are joined by abutting against each other as inclined surfaces in opposite directions inclined with respect to the circumferential direction of the core, and the magnitude of the angle θ of the joint portion of both end surfaces of the laminated body is set to 10=0. 05~0.
The magnetic resistance of the amorphous magnetic alloy ribbon laminate is set within a range of 20 to reduce the magnetic resistance of the end surface joint portion of the amorphous magnetic alloy ribbon laminate.

[Embodiments of the invention]

Embodiments of the present invention illustrated in the drawings will be described below.

FIG. 1 shows a rectangular one-turn cut wound core according to an embodiment of the present invention.

This wound core consists of a plurality of sets, for example, three sets of rectangular annular amorphous magnetic alloy ribbon laminates (hereinafter referred to as laminates) rx,
1z and xs are concentrically combined, and each of the laminated bodies 11 to 13 constitutes a plurality of sets of divided layers in which the wound core is divided in the thickness direction. Each of the laminated bodies 11 to 13 is composed of a large number of rectangular ring-shaped amorphous magnetic alloy ribbons 14, for example, 160 pieces, each having a different ridge length, cut in each turn according to each turn of the one-turn iron core. The amorphous magnetic alloy ribbons 14 are laminated in a ferrous shape, and the amorphous magnetic alloy ribbons 14 are assembled so that their cutting positions are shifted by minute lengths in the circumferential direction of the iron core. Therefore, as shown in FIG. 2, end faces 11h, 11b, 12m+12b, and 13m are formed by the cut ends of each amorphous magnetic alloy ribbon 14 in the laminated bodies 11 to 13Vc.

13b are sloped surfaces in opposite directions that are inclined with respect to the circumferential direction of the iron core so that the end portions of the ribbon are aligned by being shifted by minute lengths. In this case, the end face 11 for each laminate 11 to 13 is
*, 11b+12g+12b*13m, 13b are butt-joined to each other in an inclined state with respect to the core circumferential direction. Here, the end faces 11mrllbh1 of the laminates 11 to 13
2&r12b Letting θ be the angle between the joint of #13m and 13b and the amorphous magnetic alloy ribbon 14, set the size of this angle θ to be in the range of 10=0.05 to 0.20. do. FIG. 3 is a diagram showing changes in the iron loss deterioration rate of the wound core when the angle θ between the end surface joints of the laminates 11 to 13 and the amorphous magnetic alloy ribbon 14 is changed. . In this diagram, the horizontal axis indicates 10, and the vertical axis indicates the iron loss deterioration rate, that is, the ratio between the iron loss value of the wound core and the iron loss value of the amorphous magnetic alloy ribbon. According to this diagram, −・θ
It can be seen that when is in the range of 0.05 to 0.20, the increase rate of iron loss of the wound core relative to the iron loss of the amorphous magnetic alloy ribbon is 20% or less. Generally, the increase rate of the core loss of the wound core relative to the core loss of the core material is preferably 20% or less in practical terms. Therefore, the magnitude of the angle θ represented by the end surface joints of the laminates 11 to 13 is set to be in the range of m#=0.05 to 0.20.

Each of the laminates 11 to 13 has an end face 1 bar 11b.

The joints of 1t*, 12b, 13*, and 13b are combined so as to be located, for example, on one silicate part of the wound core, and the core frame 15 is arranged and held on the inner peripheral side of the laminate 11.

In addition, each of the laminated bodies 11-
13 end face 11 al 1 l b.

The joints of 12*, 12b, 13h, and 13b are tightened by a tool (not shown) by applying force from both sides in the stacking direction of the amorphous magnetic alloy ribbon 14 (inner and outer peripheral sides of the wound core). Tighten firmly. For this reason, the end faces 11 &#1 l b + 12 a + 1 j of each laminate 11 to 13
b+13*, 13b are pressed (tightened by force from both sides in the stacking direction) and abutted against each other in a close state to be joined. In other words, the gap created at the joint of each end face becomes very small.

Note that 16 in the figure is a coil attached to the wound core.

Therefore, in the wound core configured in this way, each laminate 11
~13 end faces 11&#111b, 12&#12b, 13h
, 13b, the magnetic resistance to the magnetic flux passing between the end faces is very small, and the magnetic properties of the end face joint are improved. Furthermore, the angle θ between the end surface joints of each of the laminates 11 to 13 and the amorphous magnetic alloy ribbon 14 is expressed as −〇=0.0.
Since it is set in the range of 5 to 0.20, the magnetic properties at the end surface joint can be made much smaller.

〔Effect of the invention〕

As explained above, according to the wound core of the present invention, the magnetic resistance at the end surface joint of the laminate formed by winding and laminating amorphous magnetic alloy thin strips is reduced, the flow of magnetic flux is improved, and the magnetic properties are improved. It is possible to obtain a wound core with improved properties.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the wound core of the present invention, and FIG.
The figure is an explanatory diagram showing an enlarged view of the end surface joint of the amorphous magnetic alloy ribbon laminate of the wound core, and Figure 3 shows the angle θ10 of the end surface joint of the amorphous magnetic alloy ribbon laminate. A diagram showing the relationship between the iron loss deterioration rate of the wound core and FIG. 4 is an explanatory view showing the end surface joint of the amorphous magnetic alloy ribbon laminate in the conventional wound core. 11.12.13...Amorphous magnetic alloy ribbon, 11a. 11b, 12*, 12b, 13m, 13b... end face,
14...Amorphous magnetic alloy ribbon. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] A large number of annular amorphous magnetic alloy ribbons cut every turn are laminated concentrically with the cutting positions shifted in the circumferential direction of the core, and both ends of the laminated body of these amorphous magnetic alloy ribbons are The surfaces are butted and joined as opposite inclined surfaces inclined with respect to the circumferential direction of the iron core, and the size of the angle θ between the joint portion of both end surfaces of the laminate and the amorphous magnetic alloy ribbon is, tan
A wound core characterized in that θ is set in a range of 0.05 to 0.20.