JP2001230134A - Outer core reactor and assembly method of outer core reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the assembly of an iron core for an outer core reactor to contrive reduction in the cost. SOLUTION: An iron core for an outer core reactor is provided with an iron core 1 consisting of E core laminated materials 10a to 10c and an I core laminated material 20 and three coils 2a to 2c which are respectively wound inside the laminated materials 10a to 10c. The most characteristic feature of the iron core is a point that the iron core 1 is formed into a structure that the laminated materials 10a to 10c are arranged in the order in such the direction to block the open side surfaces 15a to 15c of the laminated materials 10a to 10c and at the same time, the laminated materials 10a to 10c are assembled with the laminated material 20 in such a way that the open side surface 15a of the outermost E core laminated material 10a is blocked by the I core laminated material 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shell-type reactor having a structure in which a plurality of coils are wound in a line inside an iron core and a method of assembling the core for the reactor.

[0002]

2. Description of the Related Art FIG. 4 shows a schematic structure of a conventional three-phase shell-type reactor. An iron core made of an I-shaped core laminate is often used for the reactor. The I-type core laminate is formed by laminating I-type cores such as silicon steel sheets, and an iron core having a structure as shown in FIG. 1 is assembled by combining a plurality of types of I-type core laminates.

[0003]

However, in the case of the above-mentioned conventional example, since there are many points to combine the core laminates, the assembling work of the iron core is very troublesome, and it is difficult to reduce the cost in this respect. There is a disadvantage that. Therefore, instead of the three-phase core-type reactor, three single-phase core-type reactors are used as shown in FIG. 5 or three-phase core-type reactors are used as shown in FIG. Have been.

However, in the case of three single-phase shell-type reactors, there is a disadvantage that not only the overall size is increased but also the total weight is increased. On the other hand, in the case of the three-phase core iron type reactor, there is no return path of the magnetic flux generated by the zero-phase current such as the third harmonic, so that there is a disadvantage that the reactance is reduced. In short, even if such disadvantages are inherent, since the price is more important, the three-phase shell-type reactor is not used as a practical problem, and the single-phase shell-type reactor and the inner phase are not used. Iron-type reactors were used.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and an object of the present invention is to provide a method of assembling a shell-type reactor and an iron core for the reactor, which can reduce the cost. is there.

[0006]

A shell-type reactor according to the present invention comprises an iron core comprising a plurality of E-type core laminates and one I-type core laminate, and a core wound inside the E-type core laminate. And a plurality of coils, wherein the iron core is
The E-shaped core laminates are sequentially arranged in such a direction as to block the magnetic path open side end face thereof, and the magnetic path open side end face of the outermost E-type core laminate is closed with the I-type core laminate. And a structure in which the body and the I-shaped core laminate are combined.

In such a configuration, since the E-shaped core laminate is used as a constituent member of the iron core, the number of combinations of the core laminate is smaller in manufacturing the iron core than in the conventional example. Become.

In the method for assembling a core for a core-type reactor according to the present invention, a plurality of E-shaped core laminates are sequentially arranged in a direction so as to cover an end face on the magnetic path open side, and a magnetic material of the outermost E-shaped core laminate is formed. The road opening side end face is closed by an I-type core laminate, and thus the E-type core laminate and the I-type core laminate are combined to assemble an iron core for a shell-type reactor.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view for explaining the internal structure of a three-phase shell-type reactor, FIG. 2A is a perspective view of an E-type core laminate constituting an iron core of the reactor,
FIG. 3B is a perspective view of an I-type core laminate constituting the iron core, FIG. 3A is a front view of the reactor, and FIG. 3B is a side view thereof.

The shell-type reactor mentioned here is a three-phase AC reactor mainly used to absorb reactive power, and as shown in FIG.
a, an iron core 1 (corresponding to an outer iron-type reactor iron core) composed of a set of I-type core laminates 20, 10 b and 10 c;
3 wound inside each of the mold core laminates 10a to 10c
As shown in FIG. 3, a frame 3 for holding the coils 2a, 2b, and 2c and the positional relationship between the E-type core laminates 10a to 10c and the I-type core laminate 20 in the iron core 1 by using bolts 4. , 3, 3, and 3.

The E-shaped core laminate 10a is formed by laminating a plurality of E-shaped cores formed by punching a silicon steel plate or the like in an E-shape. As shown in FIG.
It is composed of three branches 12a, 13a and 14a. Bolts 4 at both ends of base portion 11a (see FIG. 3)
Holes 111a, 111a through which are passed are formed, respectively. The coil 2a is wound around the branch part 13a as shown in FIG.

The branch 1 on the outer surface of the E-shaped core laminate 10a
Since the end surfaces corresponding to the distal ends of 2a to 14a are open surfaces of the magnetic path through which the magnetic flux generated by the coil 2a passes,
Here, it is referred to as the magnetic path open side end face 15a. The same applies to the E-type core laminates 10b to 10c.

The I-type core laminate 20 is formed by laminating a plurality of I-type cores obtained by stamping a silicon steel plate or the like into an I-shape. 2 (B), and holes 21, 21 through which bolts 4 (see FIG. 3) are inserted at both ends.
Are respectively formed.

The most distinctive feature of the reactor of the present invention is the structure of the iron core 1. That is, as shown in FIG. 1, the iron core 1 arranges the E-shaped core laminates 10a to 10c sequentially in a direction so as to close the magnetic path open side end surfaces 15b and 15c, and also forms the magnetic core of the outermost E-shaped core laminate 10a. Road opening side end surface 15
a so that a is closed by the I-type core laminate 20.
It has a structure in which Oa to 10c and the I-type core laminate 20 are combined. Here, as shown in FIG. 3, the E-type core laminates 10c, 10b, 10a and the I-type core laminate 20 are stacked in this order from the bottom, and are vertically elongated.

The coil 2a is a copper wire or the like wound around the branch portion 13a of the E-shaped core laminate 10a. As shown in FIG. 3, the outer surface of the coil 2a is covered with an insulating film 21a such as a rare material, and connection terminals 22 attached to both ends of the coil 2a are provided.
a and 22a are outside the insulating film 21a. Coil 2
The same applies to b and 2c.

The frame 3 is a steel plate which is bent outward on both sides, and has holes (not shown) through which bolts 4 are passed.

A description will be given of a method of manufacturing the shell-type reactor configured as described above, and also a method of assembling the core for the shell-type reactor.

First, coils 2a to 2c are wound around branches 12a to 12c of E-shaped core laminates 10a to 10c, respectively. Then, the magnetic path open side end face 15 of the E-shaped core laminate 10c
The E-shaped core laminated body 10b is placed on c, the E-shaped core laminated body 10a is placed on the magnetic path open side end face 15b, and the I-shaped core laminated body 20 is placed on the magnetic path open side end face 15a. In short, E
The core laminations 10c, 10b, 10a are sequentially arranged in such a direction as to close the magnetic path opening side end faces 15c, 15b, and the magnetic path opening side end 15a of the outermost (uppermost) E-type core lamination 10a is I-shaped. It is closed with the core laminate 20, whereby E
The die core laminates 10a to 10c and the I-type core laminate 20 are combined.

The frame 40 is applied to both sides of both sides of the iron core 1, and the frame 4 is fixed by using a total of eight bolts 4.
Are attached to the iron core 1, the E-shaped core laminates 10a to 10a
The positional relationship between c and the I-shaped core laminate 20 is maintained, and the iron core 1 is finally assembled. The shell-type reactor of the present invention is manufactured through the above process.

In the case of the conventional three-phase shell-type reactor shown in FIG. 4, the assembly work of the iron core is very troublesome because of the large number of points to be combined with the I-type core laminated body. In assembling 1, the E-type core laminates 10 a to 10 c and the I-type core laminate 20 are combined and the number of combinations is small, so that the assembling work becomes very easy. In this respect, cost reduction can be achieved. In addition, as the number of points for combining the core laminates is reduced, there is an advantage that the overall magnetic resistance is reduced and the loss is reduced.

Compared with the three single-phase core-type reactors shown in FIG. 5, in the case of the present invention, since a three-phase magnetic circuit is constituted only by the iron core 1, even a small iron core is large. Reactance was obtained, resulting in a reduction in total weight and a reduction in overall dimensions. Specifically, as compared with the case where three single-phase shell-type reactors are stacked, the height is reduced by about 15%, and the weight can be reduced by about 15%.

Furthermore, since the coils 2a to 2c wound around the inside of the iron core 1 are arranged in a line, the magnetic fields of the respective phases obtained by the coils 2a to 2c are in the same direction. Therefore, the magnetic flux generated by the zero-phase current, such as the third harmonic, flowing through the coils 2a to 2c has a common magnetic path. Absent.

In addition, since most of the coils 2a to 2c are covered with the iron core 1, it can be arranged horizontally or vertically according to the situation of the installation location, which is very convenient. In addition, since most of the iron core 1 is exposed, the heat radiation efficiency is high, and the temperature does not easily rise even when a current such as a harmonic or a high frequency flows through the coils 2a to 2c.

As described above, in the case of the shell-type reactor of the present invention, it is possible to reduce the cost, reduce the size, and improve the performance, and the value as a product is higher than in the case of the conventional example.

The shell-type reactor of the present invention is not limited to the above-described embodiment, but can be applied to, for example, a multi-phase power reactor other than three-phase. Depending on the use of the circuit, the number of coils may be two. In addition, the present invention is not limited to the closed core type, and may be applied to a voided iron type. Further, the E-type core laminate and the I-type core laminate in the iron core may be fixed to each other by brazing or the like.

[0026]

As described above, according to the method for assembling the shell-type reactor and the core for the reactor according to the present invention, the E-type core laminate is used as a component of the iron core in addition to the I-type core laminate. From when assembling the iron core,
Compared with the case of the conventional example, the number of points for combining the core laminate is reduced. Along with this, the assembling work of the iron core becomes very simple, and it is possible to reduce the cost in this respect. In addition, there is an advantage that the total magnetic resistance is reduced and the loss is reduced because the number of combined core laminates is reduced.

[Brief description of the drawings]

FIG. 1 is a view for explaining an embodiment of the present invention, and is a schematic view for explaining an internal structure of a three-phase shell-type reactor.

FIG. 2 (A) is a perspective view of an E-type core laminate constituting the iron core of the reactor, and FIG. 2 (B) is a perspective view of an I-type core laminate constituting the same iron core.

3A is a front view of the reactor, and FIG. 3B is a side view thereof.

FIG. 4 is a diagram for explaining a conventional technique, and is a schematic diagram for explaining an internal structure of a three-phase shell-type reactor.

FIG. 5 is a diagram for explaining the prior art, and is a schematic diagram showing an example in which three single-phase core-type reactors are used instead of the three-phase core-type reactor.

FIG. 6 is a diagram for explaining a conventional technique, and is a schematic diagram for explaining an internal structure of a three-phase core iron reactor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron core 10a-10c E-type core laminated body 20 I-type core laminated body 2a-2c Coil

Claims (2)

[Claims] 1. An iron core comprising: a plurality of E-shaped core laminates and one I-shaped core laminate; and a plurality of coils wound inside the E-shaped core laminate, respectively. Is arranged so that the E-shaped core laminate is sequentially arranged in such a direction as to close the magnetic path open side end face, and the magnetic path open side end face of the outermost E-type core laminate is closed with the I-type core laminate. An outer iron-type reactor having a structure in which an E-type core laminate and the I-type core laminate are combined. 2. A plurality of E-shaped core laminates are sequentially arranged in such a direction as to close the magnetic path open side end faces, and the magnetic path open side end faces of the outermost E-type core laminate are closed by an I-type core laminate. A method of assembling a core for a shell-type reactor, wherein the core for the shell-type reactor is assembled by combining the E-type core stack and the I-type core stack in this manner.