JPS6116634Y2

JPS6116634Y2 -

Info

Publication number: JPS6116634Y2
Application number: JP6216981U
Authority: JP
Priority date: 1981-04-28
Filing date: 1981-04-28
Publication date: 1986-05-22
Also published as: JPS57175394U

Description

【考案の詳細な説明】この考案は、少なくとも２相以上の多相交流電
源により作動するようにした誘導加熱用コイルの
改良に関する。DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in an induction heating coil that is operated by a multi-phase AC power source having at least two or more phases.

この種の誘導加熱用コイルとして、たとえば、
第１図に示すように、絶縁被覆した平角導体２
を、適宜回数で、巻回して筒状のコイル本体３を
形成する一方、該コイル本体３の適宜な２つの位
置に、中間タツプ４，４を設け、図示しない三相
交流電源から、上記中間タツプ４，４、および、
コイル本体３の両端を介して、各コイル導体部３
−Ｘ，３−Ｙ，３−Ｚに、誘導加熱用の三相交流
電流を供給し、このコイル本体３内に金属ビレツ
ト１を挿入して加熱するようにしたものが知られ
ている。 Examples of this type of induction heating coil include:
As shown in Figure 1, an insulated rectangular conductor 2
is wound an appropriate number of times to form a cylindrical coil body 3, while intermediate taps 4, 4 are provided at two appropriate positions on the coil body 3, and the intermediate taps 4, 4 are connected to the intermediate tap from a three-phase AC power source (not shown). Taps 4, 4, and
Each coil conductor portion 3 is connected via both ends of the coil body 3.
It is known that a three-phase alternating current for induction heating is supplied to -X, 3-Y, and 3-Z, and a metal billet 1 is inserted into the coil body 3 for heating.

しかしながら、上述の従来の誘導加熱コイルに
おいて、隣接するコイル導体部３−Ｘと３−Ｙと
の間の異相間コイル導体部３−XY、および、コ
イル導体部３−Ｙと３−Ｚとの間の異相間コイル
導体部３−YZには、それぞれ、三相交流の各相
の誘導加熱電流にもとづく互いに位相差120゜を
有する磁束φ_Xとφ_Y、および、φ_Yとφ_Zが、強く
影響を及ぼし合つている。このため、このコイル
の異相コイルと隣接する部分のコイル導体部３−
XY，３−YZにおける渦電流損は可成り大きなも
のとなつており、加熱効率が可成り低いという欠
点があつた。 However, in the conventional induction heating coil described above, the interphase coil conductor portion 3-XY between the adjacent coil conductor portions 3-X and 3-Y, and the interphase coil conductor portion 3-XY between the coil conductor portions 3-Y and 3-Z. In the interphase coil conductor section 3- _YZ , _magnetic _fluxes _φ They strongly influence each other. Therefore, the coil conductor portion 3- of this coil adjacent to the out-of-phase coil
The eddy current loss in XY and 3-YZ was quite large, and the heating efficiency was quite low.

この考案は、上記欠点を除去するためになされ
たもので、多相交流電源により作動するようにし
た誘導加熱用コイルの相間部に相当するコイル導
体部は、各別に電気絶縁被覆した複数本の導体を
束ねて形成するようにして、当該誘導加熱コイル
の銅損を増大することもなく、相間部に相当する
コイル導体部に発生する渦電流を有効に抑制する
ようにして、加熱効率の高い、かつ、簡単な構造
の誘導加熱用コイルを提供することを目的とす
る。 This invention has been made to eliminate the above-mentioned drawbacks, and has the object of providing an induction heating coil with high heating efficiency and a simple structure, in which the coil conductor portion corresponding to the interphase portion of an induction heating coil operated by a multi-phase AC power source is formed by bundling together a number of conductors, each of which is individually coated with electrical insulation, thereby effectively suppressing eddy currents generated in the coil conductor portion corresponding to the interphase portion without increasing the copper loss of the induction heating coil.

以下に、この考案の一実施例を添付図面ととも
に説明する。 An embodiment of this invention will be described below with reference to the accompanying drawings.

第２図において、誘導加熱用のコイル本体１０
は、たとえば、絶縁ワニス等の電気絶縁材１１で
被覆された、断面形状が正方形の平角導体１２
を、順次、適宜回数づつ、巻回して成るコイル導
体部１０−Ｘ，１０−Ｙ，１０−Ｚを有してい
る。そして、このコイル本体１０の２つの相間
部、即ち、Ｘ相およびＹ相用のコイル導体部１０
−Ｘおよび１０−Ｙ間のコイル導体部１０−
XY、並びに、Ｙ相およびＺ相用のコイル導体部
１０−Ｙおよび１０−Ｚ間のコイル導体部１０−
YZが、それぞれ、電気絶縁材１１で被覆した、
断面形状が矩形とされる２本の平角導体１３，１
３を束ねて、たとえば、４回、巻回することによ
り形成されている。なお、これ等のコイル導体部
１０−XY，１０−YZを形成する２本の平角導体
１３，１３の断面積の和は、この異相コイルと隣
接する部分以外の各相部のコイル導体部１０−
Ｘ，１０−Ｙ，１０−Ｚを形成する平角導体１２
の断面積とほぼ同等とされている。 In FIG. 2, a coil body 10 for induction heating is shown.
For example, a rectangular conductor 12 with a square cross-sectional shape is coated with an electrical insulating material 11 such as an insulating varnish.
The coil conductor portions 10-X, 10-Y, and 10-Z are formed by winding each of the following coils in sequence an appropriate number of times. The coil body 10 has two interphase parts, that is, coil conductor parts 10 for the X phase and Y phase.
Coil conductor section 10- between -X and 10-Y
Coil conductor portion 10- between XY, Y phase and Z phase coil conductor portion 10-Y and 10-Z
YZ were each coated with electrical insulation material 11,
Two rectangular conductors 13, 1 each having a rectangular cross-sectional shape
3 are bundled together and wound, for example, four times. Note that the sum of the cross-sectional areas of the two rectangular conductors 13, 13 forming these coil conductor parts 10-XY, 10-YZ is the sum of the cross-sectional areas of the coil conductor parts 10 of each phase part other than the part adjacent to this different phase coil. −
Rectangular conductor 12 forming X, 10-Y, 10-Z
It is said that the cross-sectional area of

さらに、上記コイル本体１０の２つの相間部に
相当するコイル導体部１０−XYと、１０−YZと
には、それぞれ、公知の方法で、中間タツプ１
４，１４が設けられている。 Further, coil conductor portions 10-XY and 10-YZ corresponding to the two interphase portions of the coil body 10 are each provided with an intermediate tap 1 by a known method.
4 and 14 are provided.

上記構成の誘導加熱用コイルにおいて、図示し
ない誘導加熱用の三相交流電源から、コイル本体
１０の中間タツプ１４，１４および該コイル本体
１０の両端（図示しない）を介して、三相交流電
圧が印加されると、コイル導体部１０−Ｘ，１０
−Ｙ，１０−Ｚには、誘導加熱用の電流が流れ
る。そして、このコイル本体１０内に設けられた
非鉄ビレツト１等が加熱されるようになつてい
る。 In the induction heating coil configured as described above, a three-phase AC voltage is applied from a three-phase AC power source for induction heating (not shown) through intermediate taps 14, 14 of the coil body 10 and both ends (not shown) of the coil body 10. When applied, the coil conductor portions 10-X, 10
A current for induction heating flows through -Y and 10-Z. The non-ferrous billet 1 and the like provided within this coil body 10 are heated.

上記コイル本体１０の異相コイルと隣接する部
分のコイル導体部１０−XY，１０−YZは、第１
図の従来形成のコイルにおけるように１本の導体
で形成されておらず、互いに電気絶縁された２本
の平角導体１３−１，１３−２を束ねて形成され
ている。 The coil conductor portions 10-XY and 10-YZ of the coil main body 10 adjacent to the out-of-phase coil are the first
Unlike the conventionally formed coil shown in the figure, the coil is not formed of a single conductor, but is formed by bundling two rectangular conductors 13-1 and 13-2 that are electrically insulated from each other.

このように、たとえば、コイル導体部１０−
XYにおいて、平角導体１３−１Ｘと１３−２Ｘ
とは、相互に絶縁されているので、Ｙ相のコイル
導体部１０−Ｙによつて生じる磁束φ_Yによつ
て、これ等の導体１３−１Ｘと１３−２Ｘに生じ
る渦電流は抑制される。ちなみに、渦電流損は、
導体の厚さをＤ、体積をＶとして、D²Vで表わさ
れるように、この実施例においては、Ｄが1/2と
なり、うず電流損は減少する。したがつて、この
コイル本体１０の渦電流損は、有効に抑制される
こととなる。 In this way, for example, the coil conductor portion 10-
In XY, flat conductors 13-1X and 13-2X
are insulated from each other, so the eddy current generated in these conductors 13-1X and 13-2X is suppressed by the magnetic flux φ _Y generated by the Y-phase coil conductor 10-Y. . By the way, eddy current loss is
As expressed by D ² V, where D is the thickness of the conductor and V is the volume, in this embodiment, D becomes 1/2, and the eddy current loss decreases. Therefore, eddy current loss in the coil body 10 is effectively suppressed.

また、上記コイル導体部１０−XY，１０−YZ
における誘導加熱用の電流が流通する断面積は、
上述の従来形式のものとほぼ同等とされている。
したがつて、このコイル本体１０の銅損は、従来
形式のものにおけるとほぼ同等である。 In addition, the above coil conductor portions 10-XY, 10-YZ
The cross-sectional area through which the current for induction heating flows is
It is said to be almost equivalent to the conventional type described above.
Therefore, the copper loss of this coil body 10 is approximately the same as that of the conventional type.

よつて、このコイル本体１０の加熱効率は、従
来形式のものよりも高いものとすることができ
る。 Therefore, the heating efficiency of this coil body 10 can be made higher than that of the conventional type.

なお、上述した異相コイルと隣接部分のコイル
導体部１０−XY，１０−YZは、２本の平角導体
１３，１３を、コイル本体１０の軸方向に沿つて
重合するようにして形成する代りに、第３図に示
すように、コイル本体１０′の径方向に対して、
２本の平角導体１３′，１３′を積み重ねて形成す
るようにしてもよい。 Note that the coil conductor portions 10-XY and 10-YZ adjacent to the above-mentioned out-of-phase coil are formed by forming two rectangular conductors 13 and 13 so as to overlap along the axial direction of the coil body 10. , as shown in FIG. 3, in the radial direction of the coil body 10',
It may also be formed by stacking two rectangular conductors 13', 13'.

また、上記異相コイルと隣接する部分のコイル
導体部は、絶縁被覆した２本の平角導体１３，１
３を束ねて形成するものに限らず、各別に絶縁被
覆した３本以上の複数本の導体もしくは導線を束
ねて巻回して形成し、かつ、これ等の導体、もし
くは導線の断面積の総和が、当該異相コイルと隣
接する部分以外の各相のコイル導体部を形成する
導体もしくは導線の断面積とほぼ同等となるよう
にして形成したものであつてもよい。このように
して、上述したと同様、渦電流損を有効に抑制し
た、効率の高い誘導加熱用コイルとすることがで
きる。 In addition, the coil conductor portion of the portion adjacent to the above-mentioned different phase coil is made of two rectangular conductors 13 and 1 covered with insulation.
Not limited to those formed by bundling 3, it is formed by bundling and winding three or more conductors or conductors each individually coated with insulation, and the total cross-sectional area of these conductors or conductors is , the cross-sectional area may be approximately equal to the cross-sectional area of the conductor or conducting wire forming the coil conductor portion of each phase other than the portion adjacent to the different-phase coil. In this way, as described above, it is possible to obtain a highly efficient induction heating coil in which eddy current loss is effectively suppressed.

以上に説明したことから明らかなように、この
考案によれば、多相交流電源を使用する誘導加熱
用コイルの異相コイルと隣接する部分のコイル導
体部を、電気絶縁材で被覆した複数本の絶縁被覆
導体を束ねて形成するようにしたから、これ等の
絶縁被覆導体間に作用する電磁相互作用を有効に
利用して、当該部分のコイル導体部に誘起される
渦電流を有効に抑制することができ、それだけ、
効率の高い誘導加熱用コイルとすることができ
る。 As is clear from the above explanation, according to this invention, the coil conductor portion of the portion adjacent to the different-phase coil of an induction heating coil using a multiphase AC power source is Since the insulated conductors are bundled and formed, the electromagnetic interaction that acts between these insulated conductors is effectively utilized to effectively suppress the eddy current induced in the coil conductor portion of the relevant part. That's all you can do,
A highly efficient induction heating coil can be obtained.

また、この考案に係る誘導加熱用コイルは、特
別に他の部材を要することなく、単に、異相コイ
ルと隣接する部分のコイル導体部を、複数本の絶
縁被覆線で形成すればよく、また、製作に要する
導体量は従来のものと同等でよく、簡単、かつ、
安価に製作できる利点もある。 Further, the induction heating coil according to this invention does not require any other special members, and the coil conductor portion of the portion adjacent to the out-of-phase coil may simply be formed of a plurality of insulated wires, and The amount of conductor required for production is the same as that of conventional ones, and it is simple and
It also has the advantage of being inexpensive to manufacture.

[Brief explanation of the drawing]

第１図は、従来の誘導加熱用コイルの構成を示
す図、第２図は、この考案の一実施例の誘導加熱
コイルの要部の縦断面図、第３図は、この考案の
もう１つの実施例の誘導加熱コイルの要部の縦断
面図である。３……従来の誘導加熱用コイル本体、１０，１
０′……この考案の誘導加熱用コイル本体、１０
−Ｘ，１０−Ｙ，１０−Ｚ……コイル導体部、１
０−XY，１０−YZ……相間部に相当するコイル
導体部、１１……電気絶縁材、１２……平角導
体、１３−１，１３−２，１３−１Ｘ，１３−２
Ｘ……平角導体、１３′−１，１３′−２……平角
導体。 Fig. 1 is a diagram showing the configuration of a conventional induction heating coil, Fig. 2 is a vertical sectional view of the main part of an induction heating coil according to an embodiment of this invention, and Fig. 3 is a diagram showing another embodiment of this invention. FIG. 3 is a vertical cross-sectional view of a main part of an induction heating coil according to one embodiment. 3... Conventional induction heating coil body, 10,1
0'...Induction heating coil body of this invention, 10
-X, 10-Y, 10-Z...Coil conductor part, 1
0-XY, 10-YZ... Coil conductor portion corresponding to the interphase part, 11... Electrical insulating material, 12... Rectangular conductor, 13-1, 13-2, 13-1X, 13-2
X...Flat conductor, 13'-1, 13'-2...Flat conductor.

Claims

[Scope of utility model registration request]

In an induction heating coil that is operated by a multiphase AC power source of at least two phases, the coil conductor portion of the induction heating coil adjacent to the different-phase coil is a bundle of multiple conductors each individually coated with electrical insulation. What is claimed is: 1. An induction heating coil characterized in that the conductors are formed in such a manner that the sum of the cross-sectional areas of these conductors is approximately equal to the cross-sectional area of the coil conductor portions of each phase.