JP4651238B2

JP4651238B2 - High frequency induction heating coil device

Info

Publication number: JP4651238B2
Application number: JP2001253719A
Authority: JP
Inventors: 力宮崎; 利明西尾
Original assignee: 株式会社ミヤデン
Priority date: 2001-08-24
Filing date: 2001-08-24
Publication date: 2011-03-16
Anticipated expiration: 2021-08-24
Also published as: JP2003064414A

Description

【０００１】
【産業上の利用分野】
本発明は、全体形状が略柱状を呈するワークを高周波で誘導加熱する際等に使用される高周波誘導加熱用コイル装置に関する。
【０００２】
【従来の技術】
従来、例えばモータコアの製造は、所定形状の多数枚の珪素鋼板を、中間部と両端部にステンレス板を介在させ、軸心に設けた孔に軸を貫通させつつ、各珪素鋼板を例えば接着固定することにより一体化された積層鉄芯を形成することで行っている。そして、この積層鉄芯の形成時の加熱方法として、高周波誘導加熱が使用されており、そのコイル装置は、例えば外周面が絶縁処理された銅パイプを同一方向に複数回巻回することによって形成されている。
【０００３】
【発明が解決しようとする課題】
しかしながら、このコイル装置にあっては、銅パイプを同一方向に所定回数巻回することによって形成されているため、積層鉄芯に誘起される磁束の向きが該鉄芯の一端側から他端側に向けて一定方向となり、両端部と中間部に例えば補強用に設けられたステンレス板部分の加熱温度が他の部分より高くなり易い。
【０００４】
その結果、積層鉄芯の軸方向における各珪素鋼板の加熱温度が不均一となって、珪素鋼板の固着強度等にバラツキが発生し、該鉄芯に高精度な回転特性が得られ難いという問題点を有している。この傾向は、積層鉄芯の長さが長くなり中間に介在されるステンレス板（補強板）が多くなるにつれ顕著になり易く、その改善が望まれているのが実状である。
【０００５】
本発明は、このような事情に鑑みてなされたもので、その目的は、巻き方向、巻数及び配置等を効果的に設定することにより、略柱状ワークの軸方向に沿った加熱温度の均一化を図って高品質のワークが容易に得られる高周波誘導加熱用コイル装置を提供することにある。
【０００６】
【課題を解決するための手段】
かかる目的を達成すべく、本発明のうち請求項１記載の発明は、全体形状が略柱状を呈するワークを高周波の誘導加熱によって加熱する高周波誘導加熱用コイル装置であって、該コイル装置は、導体を所定方向に向けて複数回巻回した第１コイル部と、該第１コイル部に直列的に巻回されると共に第１コイル部の軸方向に沿った所定位置でその巻き方向が前記所定方向と逆方向に巻回された第２コイル部と、を備え、前記第２コイル部は、前記第１コイル部より巻数が少なく設定されて第１コイル部の内側に嵌挿配置されていることを特徴とする。
【０００７】
また、請求項２記載の発明は、前記第２コイル部の巻数が前記第１コイル部の巻数に対して１０分の１以下に設定されると共に、前記第１コイル部の一端側と前記第２コイル部の他端側が、絶縁板を介して圧接された一対の銅板に接続されていることを特徴とする。また、請求項３記載の発明は、前記ワークが補強板を有する積層鉄心で構成され、前記補強板に対応して前記第２コイル部が第１コイル部の内側に嵌挿配置されていることを特徴とする。
【０００８】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて詳細に説明する。
図１〜図４は、本発明に係わる高周波誘導加熱用コイル装置の一実施例を示している。図において、コイル装置１は、外周面が絶縁処理された銅パイプを巻回することにより形成されたコイル部２と、このコイル部２を例えば図示しないトランジスタインバータの出力端子に着脱可能に固定保持する固定部３とを有している。
【０００９】
前記コイル部２は、所定方向（例えば右巻き方向）に所定回数ｎ１（例えばｎ１＝３４回）巻回された円形の第１コイル部４と、この第１コイル部４に直列的に巻回され第１コイル部４の軸方向の略中間位置に該コイル部４とは逆方向（例えば左巻き方向）に所定回数ｎ２（例えばｎ２＝１回）巻回された円形の第２コイル部５とで構成されている。なお、第２コイル部５の巻数ｎ２は、第１コイル部４の巻数ｎ１の例えば１０分の１以下に設定され、第２コイル部５は第１コイル部４の内側に嵌挿配置されている。
【００１０】
そして、このコイル部２の両端部、すなわち第１コイル部４の一端側と第２コイル部５の他端側は、絶縁板９を介して圧接された一対の銅板６表面の角パイプ７にそれぞれ接続され、この各角パイプ７の先端にはホースコネクター８がそれぞれ固定されている。また、銅板６は、平面視コ字状に形成されて先端側の折曲面６ａと平面部６ｂに前記角パイプ７が固定され、後端側の折曲面６ｃが前記トランジスタインバータへの固定面を形成している。なお、角パイプ７に固定されたホースコネクター８には、トランジスタインバータに例えば一体化された冷却装置が接続され、冷却水が角パイプ７とコイル部２に循環供給されるように構成されている。
【００１１】
このコイル装置１よれば、銅板６の折曲面６ｃをトランジスタインバータの出力端子にボルト等でそれぞれ固定し、冷却装置とホースコネクター８とを可撓性のホースで接続する。そして、コイル部２の円形内にワークとしての積層鉄芯を図示しない支持装置で嵌挿支持させ、トランジスタインバータを作動させると、高周波電流が銅板６を介してコイル部２の第１コイル部４と第２コイル部５に供給される。また、この高周波電流の供給と略同時にホース、角パイプ７を介してコイル部２の銅パイプ内に冷却水が循環供給され、コイル部２の発熱が抑えられる。
【００１２】
コイル部２に高周波電流が供給されると、第１コイル部４と第２コイル部５からそれぞれ所定方向の磁束が発生し、この磁束は、第１コイル部４と第２コイル部５の巻き方向が逆向きに設定されていることから、その軸方向の略中間部分において、互いに逆方向の磁束が交差し、該部分に発生する第１コイル部４による磁束が第２コイル部５の磁束で一部打ち消される状態となる。
【００１３】
これにより、ワークの長手方向の略中間位置に配置された補強板部分に誘起される渦電流が他の部分に対して少なくなり、ワークの長手方向全域における誘導加熱状態、すなわち加熱温度が均一化される。この加熱温度の均一化で、積層鉄芯の多数枚の珪素鋼板が均一に接着固定され、この積層鉄芯を例えばモータの回転子として使用することにより、安定した回転が得られることになる。なお、実験によれば、コイル装置１の使用で、積層鉄芯の長手方向における温度差を数度（例えば３℃）以内に設定できることが確認されている。
【００１４】
つまり、積層鉄芯の補強や極の分割のために設けられるステンレス板部分における磁束を一部打ち消して該部分に誘起される渦電流を小さくすることで、他の部分との渦電流の平均化を図り、積層鉄芯の長手方向全域の加熱温度を均一化して、各珪素鋼板間の固着状態等を安定させることができる。また、巻数の少ない第２コイル部５が第１コイル部４の内側に位置することで、第２コイル部５を第１コイル部４で保護できて、コイル装置１の形状の安定化と使い勝手の向上が図れる。
【００１５】
なお、以上の説明においては、コイル部２を円形に形成したが、ワークの形状によっては方形状に形成することもできるし、コイル部２の形態として馬蹄形状に形成することもできる。また、上記実施例の第１コイル部４と第２コイル部５の巻数ｎ１、ｎ２も一例であって適宜に増減することができるし、本発明はワークとして積層鉄芯に限らず、他の適宜の略柱状を呈するワークに適用することができる。
【００１６】
【発明の効果】
以上詳述したように、請求項１ないし３記載の発明によれば、所定方向に複数回巻回された第１コイル部と、この第１コイル部の巻き方向が逆の第２コイル部とを備えるため、第２コイル部で第１コイル部の磁束を弱めることができ、例えばワークの中間部に設けられた補強板部分の加熱温度を下げて、ワークの軸方向全域における温度を均一化して、高品質のワークを得ることができる。
【００１７】
また、巻数が少ない第２コイル部が第１コイル部の内側に位置するため、第２コイル部を第１コイル部で保護できて、コイル装置の耐久性向上が図れると共に、使い勝手の向上を図ることができる。
【図面の簡単な説明】
【図１】本発明に係わる高周波誘導加熱用コイル装置の一実施例を示す側面図
【図２】同その平面図
【図３】同図２の右側面図
【図４】同図１のＡ−Ａ線断面図
【符号の説明】
１コイル装置
２コイル部
３固定部
４第１コイル部
５第２コイル部
６銅板
７角パイプ[0001]
[Industrial application fields]
The present invention relates to a coil device for high frequency induction heating that is used when a workpiece having an overall columnar shape that is substantially columnar is induction heated at a high frequency.
[0002]
[Prior art]
Conventionally, for example, a motor core is manufactured by bonding a number of silicon steel plates of a predetermined shape, with stainless steel plates interposed in the middle and both ends, and by adhering and fixing each silicon steel plate, for example, through a hole in the shaft center. This is done by forming an integrated laminated iron core. And as a heating method at the time of formation of this laminated iron core, high frequency induction heating is used, and the coil device is formed by, for example, winding a copper pipe whose outer peripheral surface is insulated multiple times in the same direction. Has been.
[0003]
[Problems to be solved by the invention]
However, since this coil device is formed by winding a copper pipe a predetermined number of times in the same direction, the direction of the magnetic flux induced in the laminated iron core is changed from one end side to the other end side of the iron core. For example, the heating temperature of the stainless steel plate portions provided for reinforcement at both end portions and the intermediate portion is likely to be higher than the other portions.
[0004]
As a result, the heating temperature of each silicon steel plate in the axial direction of the laminated iron core becomes non-uniform, and the fixing strength of the silicon steel plate varies, making it difficult to obtain high-precision rotational characteristics for the iron core. Has a point. This tendency tends to become more prominent as the length of the laminated iron core increases and the number of intermediate stainless steel plates (reinforcement plates) increases, and the actual situation is that improvement is desired.
[0005]
The present invention has been made in view of such circumstances, and its purpose is to equalize the heating temperature along the axial direction of the substantially columnar workpiece by effectively setting the winding direction , the number of windings , the arrangement, and the like . It is intended to provide a high frequency induction heating coil device that can easily obtain a high-quality work.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 of the present invention is a high frequency induction heating coil device that heats a work having an overall columnar shape by a high frequency induction heating, the coil device comprising: A first coil portion wound a conductor several times in a predetermined direction, and wound in series at the predetermined position along the axial direction of the first coil portion while being wound in series in the first coil portion. A second coil portion wound in a direction opposite to the predetermined direction, and the second coil portion is set to have a smaller number of turns than the first coil portion , and is fitted and arranged inside the first coil portion. and said that you are.
[0007]
According to a second aspect of the present invention, the number of turns of the second coil part is set to 1/10 or less of the number of turns of the first coil part, and one end side of the first coil part and the first coil part The other end side of two coil parts is connected to a pair of copper plates press-contacted via the insulating plate. According to a third aspect of the present invention, the work is composed of a laminated iron core having a reinforcing plate, and the second coil portion is inserted and arranged inside the first coil portion corresponding to the reinforcing plate. It is characterized by.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 4 show an embodiment of a coil device for high frequency induction heating according to the present invention. In the figure, a coil device 1 has a coil part 2 formed by winding a copper pipe whose outer peripheral surface is insulated, and this coil part 2 is detachably fixed to an output terminal of a transistor inverter (not shown), for example. And a fixing portion 3 to be used.
[0009]
The coil portion 2 is wound in series in a circular first coil portion 4 wound n1 (for example, n1 = 34 times) a predetermined number of times in a predetermined direction (for example, right-handed direction), and the first coil portion 4. A circular second coil portion 5 wound at a substantially intermediate position in the axial direction of the first coil portion 4 by a predetermined number of times n2 (for example, n2 = 1) in a direction opposite to the coil portion 4 (for example, left-handed direction); It consists of The number of turns n2 of the second coil part 5 is set to, for example, one tenth or less of the number of turns n1 of the first coil part 4, and the second coil part 5 is inserted and arranged inside the first coil part 4. Yes.
[0010]
Then, both end portions of the coil portion 2, that is, one end side of the first coil portion 4 and the other end side of the second coil portion 5 are connected to the square pipe 7 on the surface of the pair of copper plates 6 that are press-contacted via the insulating plate 9. Each hose connector 8 is fixed to the tip of each square pipe 7. Further, the copper plate 6 is formed in a U shape in plan view, and the square pipe 7 is fixed to the bent surface 6a and the flat portion 6b on the front end side, and the bent surface 6c on the rear end side serves as a fixed surface to the transistor inverter. Forming. The hose connector 8 fixed to the square pipe 7 is connected to a transistor inverter, for example, an integrated cooling device so that cooling water is circulated and supplied to the square pipe 7 and the coil unit 2. .
[0011]
According to this coil device 1, the folding surface 6c of the copper plate 6 is fixed to the output terminal of the transistor inverter with a bolt or the like, and the cooling device and the hose connector 8 are connected with a flexible hose. When a laminated iron core as a work is inserted into and supported by a support device (not shown) in the circle of the coil part 2 and the transistor inverter is operated, a high-frequency current is passed through the copper plate 6 to the first coil part 4 of the coil part 2. And supplied to the second coil unit 5. Further, cooling water is circulated and supplied into the copper pipe of the coil part 2 through the hose and the square pipe 7 almost simultaneously with the supply of the high-frequency current, and the heat generation of the coil part 2 is suppressed.
[0012]
When a high frequency current is supplied to the coil unit 2, a magnetic flux in a predetermined direction is generated from each of the first coil unit 4 and the second coil unit 5, and this magnetic flux is wound around the first coil unit 4 and the second coil unit 5. Since the direction is set in the opposite direction, the magnetic fluxes in the opposite directions cross each other at a substantially intermediate portion in the axial direction, and the magnetic flux generated by the first coil portion 4 in the portion is the magnetic flux of the second coil portion 5. It will be in a state where it is partially canceled by.
[0013]
As a result, the eddy current induced in the reinforcing plate portion arranged at a substantially intermediate position in the longitudinal direction of the workpiece is reduced relative to other portions, and the induction heating state in the entire longitudinal direction of the workpiece, that is, the heating temperature is made uniform. Is done. By uniforming the heating temperature, a large number of silicon steel plates having a laminated iron core are uniformly bonded and fixed. By using this laminated iron core as a rotor of a motor, for example, stable rotation can be obtained. In addition, according to experiment, it has been confirmed that the temperature difference in the longitudinal direction of the laminated iron core can be set within several degrees (for example, 3 ° C.) by using the coil device 1.
[0014]
In other words, eddy currents with other parts are averaged by canceling part of the magnetic flux in the stainless steel plate part provided to reinforce the laminated iron core and splitting the poles to reduce the eddy current induced in the part. Thus, the heating temperature in the entire longitudinal direction of the laminated iron core can be made uniform, and the fixing state between the silicon steel sheets can be stabilized. Further, since the second coil portion 5 having a small number of turns is positioned inside the first coil portion 4, the second coil portion 5 can be protected by the first coil portion 4, and the shape and stability of the coil device 1 can be stabilized. Can be improved.
[0015]
In addition, in the above description, although the coil part 2 was formed circularly, depending on the shape of a workpiece | work, it can also be formed in a square shape and can also be formed in a horseshoe shape as a form of the coil part 2. FIG. Further, the number of turns n1 and n2 of the first coil portion 4 and the second coil portion 5 in the above embodiment is also an example, and can be appropriately increased or decreased. The present invention is not limited to the laminated iron core, It can be applied to a workpiece having an appropriate substantially columnar shape.
[0016]
【The invention's effect】
As described above in detail, according to the first to third aspects of the invention, the first coil portion wound a plurality of times in a predetermined direction, and the second coil portion in which the winding direction of the first coil portion is reversed, Therefore, the magnetic flux of the first coil part can be weakened by the second coil part. For example, the heating temperature of the reinforcing plate part provided in the intermediate part of the work is lowered, and the temperature in the entire axial direction of the work is made uniform. High quality work can be obtained.
[0017]
In addition, since the second coil portion having a small number of turns is positioned inside the first coil portion, the second coil portion can be protected by the first coil portion, and the durability of the coil device can be improved and the usability can be improved. be able to.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a high frequency induction heating coil device according to the present invention. FIG. 2 is a plan view thereof. FIG. 3 is a right side view of FIG. -A line cross section [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coil apparatus 2 Coil part 3 Fixed part 4 1st coil part 5 2nd coil part 6 Copper plate 7 Square pipe

Claims

A coil device for high-frequency induction heating that heats a workpiece whose overall shape is substantially columnar by high-frequency induction heating,
The coil device includes a first coil portion in which a conductor is wound a plurality of times in a predetermined direction, and is wound in series around the first coil portion and at a predetermined position along the axial direction of the first coil portion. A second coil part wound in a direction opposite to the predetermined direction, and the second coil part is set to have a smaller number of turns than the first coil part and is located inside the first coil part. A coil device for high-frequency induction heating, wherein the coil device is inserted and arranged .

The number of turns of the second coil part is set to 1/10 or less of the number of turns of the first coil part, and one end side of the first coil part and the other end side of the second coil part are insulated plates. The high frequency induction heating coil device according to claim 1, wherein the coil device is connected to a pair of copper plates that are press-contacted via each other .

The said work is comprised with the laminated iron core which has a reinforcement board, and the said 2nd coil part is inserted and arrange | positioned inside the 1st coil part corresponding to the said reinforcement board, The Claim 1 or 2 characterized by the above-mentioned. Coil equipment for high frequency induction heating.