JPS6144395Y2

JPS6144395Y2 -

Info

Publication number: JPS6144395Y2
Application number: JP4625182U
Authority: JP
Priority date: 1982-03-31
Filing date: 1982-03-31
Publication date: 1986-12-13
Also published as: JPS58148897U

Description

【考案の詳細な説明】この考案は、スラブエツジヒータ等に用いられ
る鉄心付平面加熱用コイルの改良に関するもので
ある。[Detailed Description of the Invention] This invention relates to an improvement of a flat heating coil with an iron core used in a slab edge heater or the like.

およそこの種のコイルは第１図に示すような配
置で使用され、また従来のコイルの構造は第２図
に示されているようなものであつた。まず第１図
において、１は巻線、２は凸状脚部３を有する鉄
心、４は前記巻線１に交流電流を印加する電源、
５は被加熱物、６は磁束である。次に第２図にお
いて、７は硅素鋼板、６は水冷銅板、９は絶縁ボ
ルト、１０はマイカ薄板であり、これら７〜１０
により鉄心２を構成している。 Generally, this type of coil is used in an arrangement as shown in FIG. 1, and the structure of a conventional coil is as shown in FIG. First, in FIG. 1, 1 is a winding, 2 is an iron core having a convex leg portion 3, 4 is a power source for applying alternating current to the winding 1,
5 is an object to be heated, and 6 is a magnetic flux. Next, in FIG. 2, 7 is a silicon steel plate, 6 is a water-cooled copper plate, 9 is an insulating bolt, and 10 is a mica thin plate.
constitutes the iron core 2.

次にその作用について説明する。以上のような
構成において、磁束６が硅素鋼板７を通過する
と、一枚一枚薄板ではあるが、エデイ損とヒステ
リシス損を発生し、発熱する。硅素鋼板７の積層
部の中央にあるマイカ薄板１０は、硅素鋼板７に
誘起される電圧によつてループ状に流れる電流を
遮断するために配置され、その両側の硅素鋼板７
は水冷銅板８によつて冷却されている。ところが
従来の鉄心では、図示のように前記マイカ薄板１
０は水冷銅板８によつて区画された硅素鋼板７の
積層部の中央に１枚ずつ挿入されているのみであ
つた。 Next, its effect will be explained. In the above configuration, when the magnetic flux 6 passes through the silicon steel plates 7, although each of the plates is thin, eddy loss and hysteresis loss occur, and heat is generated. The mica thin plate 10 in the center of the laminated portion of the silicon steel plate 7 is arranged to interrupt the current flowing in a loop due to the voltage induced in the silicon steel plate 7, and the silicon steel plate 7 on both sides
is cooled by a water-cooled copper plate 8. However, in the conventional iron core, as shown in the figure, the mica thin plate 1
No. 0 was only inserted one by one into the center of the laminated portion of the silicon steel plates 7 divided by the water-cooled copper plates 8.

しかるに第１図でもわかるように、磁束６の流
れは鉄心２の凸状脚部３の端部に集中する傾向が
あり、凸状脚部３の発熱は均等ではないため、端
部の硅素鋼板７の温度が異常に上昇し、最悪のケ
ースでは巻線の絶縁焼損や硅素鋼板の溶融という
事故にまで発展するおそれがあつた。 However, as can be seen in FIG. 1, the flow of magnetic flux 6 tends to concentrate at the ends of the convex legs 3 of the iron core 2, and since the heat generation of the convex legs 3 is not uniform, the silicon steel plate at the end 7's temperature rose abnormally, and in the worst case, there was a risk of an accident resulting in burnout of the winding insulation or melting of the silicon steel plate.

この考案は上記のような従来のものの欠点を除
去するためになされたもので、磁束集中のはげし
い両端部の硅素鋼板をマイカ薄板によつて多数ブ
ロツクに区画することにより、発熱の低減を図ろ
うとするものである。 This idea was made in order to eliminate the drawbacks of the conventional ones as described above, and it attempted to reduce heat generation by dividing the silicon steel plate at both ends, where magnetic flux concentration is severe, into multiple blocks with mica thin plates. It is something to do.

即ち第３図はこの考案の一実施例を示すもの
で、図において、７，８，９，１０は第２図と同
様であるが、両端部の水冷銅板８間の硅素鋼板７
の積層部には、約５mmピツチに0.1mm厚のマイカ
薄板１０が挿入されている。なお中央の積層部に
は従来と同様に１枚だけ0.1mm厚のマイカ薄板１
０が挿入されており、硅素鋼板７の積層厚さは水
冷銅板間の厚さで30mmである。 That is, FIG. 3 shows an embodiment of this invention. In the figure, 7, 8, 9, and 10 are the same as in FIG. 2, but the silicon steel plate 7 between the water-cooled copper plates 8 at both ends is
Mica thin plates 10 with a thickness of 0.1 mm are inserted into the laminated portion at a pitch of about 5 mm. In addition, in the central laminated part, there is only one mica thin plate 1 with a thickness of 0.1 mm, as in the past.
0 is inserted, and the laminated thickness of the silicon steel plates 7 is 30 mm between the water-cooled copper plates.

このように構成すると、両端部硅素鋼板７の冷
却効果は若干悪くなるが、絶縁板で区切られた表
面積内の磁束が減少し、誘起電圧が小さくなるた
め、ループ電流が阻止されて発熱が極端に小さく
なる。 With this configuration, the cooling effect of the silicon steel plates 7 at both ends is slightly deteriorated, but the magnetic flux within the surface area separated by the insulating plates is reduced and the induced voltage is reduced, so the loop current is blocked and heat generation becomes extreme. becomes smaller.

なお上記実施例では５mmピツチでマイカ薄板を
配置したが、磁束の集中の度合に応じてその配置
間隔はもつと小さくしてもよい。又、マイカ薄板
は、耐熱性有機絶縁板ペーパでもよいし、硅素鋼
板にセラミツクコーテイングした薄膜でもよい。 In the above embodiment, the mica thin plates were arranged at a pitch of 5 mm, but the arrangement interval may be made smaller depending on the degree of concentration of magnetic flux. Further, the mica thin plate may be a heat-resistant organic insulating paper, or a thin film formed by coating a silicon steel plate with ceramic.

本考案は以上のような簡単な構成変更によつ
て、鉄心２の温度を安全限界内におさえることが
でき、コイルの寿命をのばし、信頼性を高め得る
効果がある。 The present invention has the effect of suppressing the temperature of the iron core 2 within a safe limit by making the above-mentioned simple configuration changes, extending the life of the coil, and increasing reliability.

なお本考案は開放脚に巻線を周回させたコイル
から、すべての用途に用いられるコイルに適用で
きるものである。 The present invention can be applied to coils used for all purposes, including coils in which windings are wound around open legs.

【図面の簡単な説明】[Brief explanation of drawings]

第１図はコイルの使用状態を示す正面図イと側
面図ロ、第２図は従来のコイルを示すもので、第
１図の−線断面図、第３図は本考案の一実施
例を示すもので、第２図に対応する図である。図中、１は巻線、２は鉄心、３は凸状脚部、７
は硅素鋼板、８は水冷銅板、１０は絶縁薄板であ
る。尚図中、同一符号は同一または相当する部分
を示す。 Fig. 1 shows a front view A and a side view B showing how the coil is used, Fig. 2 shows a conventional coil, a sectional view taken along the - line in Fig. 1, and Fig. 3 shows an embodiment of the present invention. This is a diagram corresponding to FIG. 2. In the figure, 1 is a winding, 2 is an iron core, 3 is a convex leg, and 7
8 is a silicon steel plate, 8 is a water-cooled copper plate, and 10 is an insulating thin plate. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims

【実用新案登録請求の範囲】 (1) 凸状脚部を有する硅素鋼板を積層してなる鉄
心、この鉄心の凸状脚部の周囲に巻回され交番
電流を印加される巻線、前記鉄心の硅素鋼板積
層方向に挟み込まれた複数枚の水冷銅板、この
水冷銅板間の約半分の位置において硅素鋼板積
層中に挟み込まれた絶縁薄板を有し、かつこれ
らを絶縁ボルトで積層方向に締め付けるものに
おいて、積層厚方向の両端部の水冷銅板に挟ま
れた区画内の硅素鋼板積層部のみに、複数枚の
絶縁薄板を挟み込んでいることを特徴とする誘
導加熱用コイル。 (2) 絶縁薄板は、マイカ板からなる実用新案登録
請求範囲第１項記載の誘導加熱用コイル。 (3) 絶縁薄板は、耐熱性有機絶縁板ペーパからな
る実用新案登録請求範囲第１項記載の誘導加熱
用コイル。 (4) 絶縁薄板は、該当部の硅素鋼板１枚の片面に
セラミツクコーテイングされた薄膜からなる実
用新案登録請求範囲第１項記載の誘導加熱用コ
イル。[Claims for Utility Model Registration] (1) An iron core made of laminated silicon steel plates having convex legs, a winding wound around the convex legs of this iron core and to which an alternating current is applied, and the iron core. Multiple water-cooled copper plates sandwiched in the laminated direction of the silicon steel plates, and a thin insulating plate sandwiched between the laminated silicon steel plates at approximately half the positions between the water-cooled copper plates, and these are tightened in the laminated direction with insulating bolts. An induction heating coil characterized in that a plurality of insulating thin plates are sandwiched only in the silicon steel plate laminated portion in the section sandwiched between the water-cooled copper plates at both ends in the laminated thickness direction. (2) The induction heating coil according to claim 1 of the utility model registration, wherein the insulating thin plate is a mica plate. (3) The induction heating coil according to claim 1, wherein the thin insulating plate is made of heat-resistant organic insulating paper. (4) The induction heating coil according to claim 1 of the utility model registration, wherein the insulating thin plate is a thin film coated with ceramic on one side of a silicon steel plate in the relevant part.