JP2019071250A

JP2019071250A - Rotor core heating device

Info

Publication number: JP2019071250A
Application number: JP2017197647A
Authority: JP
Inventors: 一路岡田; Kazumichi Okada
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2017-10-11
Filing date: 2017-10-11
Publication date: 2019-05-09

Abstract

【課題】ロータコアの加熱効率の低下を抑制することが可能な、ロータコア加熱装置を提供すること。【解決手段】本発明にかかるロータコア加熱装置１は、ロータコアＣの外周面側および内周面側を高周波誘導加熱するロータコア加熱装置１であって、外周面側に配設された加熱コイル１１の外側と、内周面側に配設された加熱コイル２１の内側のいずれか一方又は双方に、電磁鋼板からなる加熱補助部材を備え、加熱コイルと加熱補助部材とは、絶縁部材によって絶縁されている。【選択図】図１PROBLEM TO BE SOLVED: To provide a rotor core heating device capable of suppressing a decrease in heating efficiency of a rotor core. SOLUTION: The rotor core heating device 1 according to the present invention is a rotor core heating device 1 for high frequency induction heating of an outer peripheral surface side and an inner peripheral surface side of a rotor core C, and a heating coil 11 arranged on the outer peripheral surface side A heating auxiliary member made of an electromagnetic steel plate is provided on either one or both of the outer side and the inner side of the heating coil 21 arranged on the inner peripheral surface side, and the heating coil and the heating auxiliary member are insulated by an insulating member. There is. [Selection diagram] Fig. 1

Description

本発明は、ロータコア加熱装置に関するものである。 The present invention relates to a rotor core heating device.

モータの製造工程では、ロータコアへのシャフトの焼き嵌めやモータの組み立てのために、ロータコアを加熱する必要がある。ロータコアの加熱には、ロータコア加熱装置が用いられる。特許文献１には、ロータコアの外周面側と内周面側とに加熱コイルを設け、ロータコアを高周波誘導加熱する、ロータコア加熱装置が開示されている。 In the motor manufacturing process, it is necessary to heat the rotor core for shrink fitting of the shaft to the rotor core and assembly of the motor. A rotor core heating device is used to heat the rotor core. Patent Document 1 discloses a rotor core heating device in which heating coils are provided on the outer peripheral surface side and the inner peripheral surface side of a rotor core to perform high frequency induction heating of the rotor core.

特開２０１３−１０２６２２号公報JP, 2013-102622, A

背景技術で述べたように、ロータコアの加熱では、ロータコアの外周面側と内周面側との両方に加熱コイルを配置し、ロータコアを加熱する。この場合、高周波誘導加熱によって生じる磁力線（磁界）が、透磁率の低い空気を介してロータコアに到達する。磁力線が透磁率の低い空気を通過することによって、磁力線のロータコアへの到達が減り、ロータコアの加熱効率が低くなるという問題がある。 As described in the background art, in heating the rotor core, heating coils are disposed on both the outer peripheral surface side and the inner peripheral surface side of the rotor core to heat the rotor core. In this case, magnetic lines of force (magnetic field) generated by high frequency induction heating reach the rotor core via air with low permeability. There is a problem that the passage of the magnetic field lines through the air of low permeability reduces the reach of the magnetic field lines to the rotor core, and the heating efficiency of the rotor core becomes low.

本発明は、上記の問題を鑑みてなされたものであり、ロータコアの加熱効率の低下を抑制することが可能な、ロータコア加熱装置を提供するものである。 The present invention has been made in view of the above problems, and provides a rotor core heating device capable of suppressing a decrease in heating efficiency of the rotor core.

本発明にかかるロータコア加熱装置は、ロータコアの外周面側および内周面側を高周波誘導加熱するロータコア加熱装置であって、前記外周面側に配設された加熱コイルの外側と、前記内周面側に配設された加熱コイルの内側のいずれか一方又は双方に、電磁鋼板からなる加熱補助部材を備え、前記加熱コイルと前記加熱補助部材とは、絶縁部材によって絶縁されている。 The rotor core heating device according to the present invention is a rotor core heating device for performing high frequency induction heating on the outer peripheral surface side and the inner peripheral surface side of the rotor core, and the outer surface of the heating coil disposed on the outer peripheral surface side and the inner peripheral surface A heating assisting member made of a magnetic steel sheet is provided on one or both of the inner side of the heating coil disposed on the side, and the heating coil and the heating assisting member are insulated by an insulating member.

本発明にかかるロータコア加熱装置では、外周面側に配設された加熱コイルの外側と、内周面側に配設された加熱コイルの内側のいずれか一方又は双方に、電磁鋼板からなる加熱補助部材を備えている。電磁鋼板は透磁率が高いため、ロータコアを高周波加熱する際に磁力線を通しやすい。よって、ロータコアの加熱効率の低下を抑制することができる。 In the rotor core heating device according to the present invention, the heating aid made of electromagnetic steel sheet on either or both of the outside of the heating coil disposed on the outer peripheral surface side and the inside of the heating coil disposed on the inner peripheral surface side. It has a member. Since the magnetic steel sheet has a high permeability, it is easy to pass the magnetic lines when the rotor core is heated at a high frequency. Therefore, the reduction in the heating efficiency of the rotor core can be suppressed.

本発明により、ロータコアの加熱効率の低下を抑制することが可能な、ロータコア加熱装置を提供することができる。 According to the present invention, it is possible to provide a rotor core heating device capable of suppressing a decrease in heating efficiency of the rotor core.

実施の形態にかかるロータコア加熱装置の平面図およびロータコア加熱装置の内周面側の拡大平面図である。They are a top view of a rotor core heating device concerning an embodiment, and an enlarged plan view by the side of inner skin of a rotor core heating device. 実施の形態にかかるロータコア加熱装置の内周面側加熱コイルの正面拡大図である。It is a front enlarged view of the inner peripheral surface side heating coil of the rotor core heating apparatus concerning embodiment. 図１のＩＩＩ−ＩＩＩ線に沿う、実施の形態にかかるロータコア加熱装置の側面断面図である。It is side surface sectional drawing of the rotor core heating apparatus concerning embodiment which follows the III-III line of FIG. 実施例にかかるロータコア加熱装置を用いてロータコアを加熱した際の加熱効率を示すグラフである。It is a graph which shows the heating efficiency at the time of heating a rotor core using the rotor core heating apparatus concerning an Example.

以下、本発明の具体的な実施の形態について、図面を参照しながら詳細に説明する。ただし、本発明が以下の実施の形態に限定される訳ではない。また、説明を明確にするため、図面は適宜、簡略化されている。
なお、当然のことながら、図１〜図３に示した右手系ｘｙｚ座標は、構成要素の位置関係を説明するための便宜的なものである。通常、ｚ軸プラス向きが鉛直上向き、ｘｙ平面が水平面であり、図面間で共通である。 Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Also, in order to clarify the explanation, the drawings are simplified as appropriate.
As a matter of course, the right-handed xyz coordinates shown in FIG. 1 to FIG. 3 are convenient for describing the positional relationship of the components. Usually, the z-axis plus direction is vertically upward, and the xy plane is a horizontal plane, which is common to the drawings.

＜実施の形態＞
図１は、実施の形態にかかるロータコア加熱装置１の平面図およびロータコア加熱装置１の内周面側の拡大平面図である。図１に示すように、ロータコア加熱装置１は、外周面側加熱コイル１１、外周面側加熱補助部材１２、外周面側絶縁部材１３、外周面側加熱コイル保持部材１４を備える。さらに、図１の下部の拡大図に示すように、ロータコア加熱装置１は、内周面側加熱コイル２１、内周面側加熱補助部材２２、内周面側絶縁部材２３を備える。 Embodiment
FIG. 1 is a plan view of a rotor core heating device 1 according to the embodiment and an enlarged plan view of an inner peripheral surface side of the rotor core heating device 1. As shown in FIG. 1, the rotor core heating device 1 includes an outer peripheral surface side heating coil 11, an outer peripheral surface side heating assisting member 12, an outer peripheral surface side insulating member 13, and an outer peripheral surface heating coil holding member 14. Furthermore, as shown to the enlarged view of the lower part of FIG. 1, the rotor core heating apparatus 1 is provided with the inner peripheral surface side heating coil 21, the inner peripheral surface side heating auxiliary member 22, and the inner peripheral surface side insulation member 23.

本実施の形態のロータコア加熱装置１は、高周波誘導加熱によってロータコアを加熱する際に用いられる。例えば、ロータコアＣへのシャフトの焼き嵌めに用いられる。具体的には、ロータコアＣの外周面側および内周面側を高周波誘導加熱によって加熱し、特に内周面側の内径を広げてシャフトを嵌め込み、冷却し、ロータコアとシャフトとを接合する。図１は、ロータコア加熱装置１に、加熱対象物であるロータコアＣが配置された状態を示している。 The rotor core heating device 1 of the present embodiment is used when heating the rotor core by high frequency induction heating. For example, it is used for shrink fitting of the shaft to the rotor core C. Specifically, the outer peripheral surface side and the inner peripheral surface side of the rotor core C are heated by high frequency induction heating, in particular, the inner diameter on the inner peripheral surface side is expanded to fit the shaft and cooled, and the rotor core and the shaft are joined. FIG. 1 shows a state in which a rotor core C, which is an object to be heated, is disposed in the rotor core heating device 1.

外周面側加熱コイル１１は、円筒状のロータコアＣの外周面側を加熱する加熱コイルである。外周面側加熱コイル１１は螺旋形状であり、図１に示すように、ロータコアＣの軸方向（ｚ軸方向）の外周面を巻装するように配置される。また、外周面側加熱コイル１１は、外周面側加熱コイル保持部材１４を用いて保持されている。 The outer peripheral surface side heating coil 11 is a heating coil which heats the outer peripheral surface side of the cylindrical rotor core C. The outer peripheral surface side heating coil 11 has a helical shape, and as shown in FIG. 1, is disposed so as to wind the outer peripheral surface in the axial direction (z-axis direction) of the rotor core C. Further, the outer peripheral surface side heating coil 11 is held using the outer peripheral surface side heating coil holding member 14.

高周波誘導加熱では、加熱コイルに高周波電流が流れると、加熱コイルの周囲に発生した磁力線（磁界）が、ロータコアＣを通過する。磁力線が通過するロータコアＣでは、通過する磁力線とは逆方向の磁力線を発生しようとする誘導電流（渦電流）が生じる。磁力線が通過して生じる渦電流によって、ロータコアＣでは自己発熱が生じ、自己発熱によってロータコアＣは加熱される。 In high frequency induction heating, when a high frequency current flows through the heating coil, magnetic lines of force (magnetic field) generated around the heating coil pass through the rotor core C. In the rotor core C through which the magnetic field lines pass, an induced current (eddy current) is generated which tends to generate magnetic field lines in the opposite direction to the passing magnetic field lines. The eddy current generated by passing the magnetic field lines causes self-heating in the rotor core C, and the rotor core C is heated by the self-heating.

外周面側加熱補助部材１２は、外周面側加熱コイル１１を用いたロータコアＣの加熱を補助する部材である。図１に示すように、外周面側加熱補助部材１２は、外周面側加熱コイル１１の外側に配設されている。図１に示すように、外周面側加熱補助部材１２は薄板状であり、ロータコアＣの径方向に複数枚積層されている。また、外周面側加熱補助部材１２は、外周面側加熱コイル保持部材１４によって、ロータコアＣの周方向に分断され、かつ、そのロータコアＣの軸方向の一端面から他端面に亘って、その分断部分は延在している。 The outer peripheral surface side heating assisting member 12 is a member for assisting the heating of the rotor core C using the outer peripheral surface side heating coil 11. As shown in FIG. 1, the outer peripheral surface side heating assisting member 12 is disposed outside the outer peripheral surface side heating coil 11. As shown in FIG. 1, the outer peripheral surface side heating assisting member 12 has a thin plate shape, and a plurality of sheets are laminated in the radial direction of the rotor core C. Further, the outer peripheral surface side heating assisting member 12 is divided in the circumferential direction of the rotor core C by the outer peripheral surface side heating coil holding member 14 and divided from one end surface to the other end surface of the rotor core C in the axial direction The part is extended.

一般に、加熱コイル周辺に置かれた部品は、その体積が大きいほど渦電流が流れやすく、渦電流の自己発熱によって加熱されやすい。しかし、外周面側加熱補助部材１２をこのように、薄板状かつ複数枚積層された構造とすることによって、外周面側加熱補助部材１２自体に渦電流が発生することを抑制でき、外周面側加熱補助部材１２が意図せずに加熱されてしまうことを抑制できる。なお、薄板の厚みと積層数は、電力量に応じて適宜変更可能である。 In general, a component placed around a heating coil tends to flow eddy current as its volume is larger and to be heated by self-heating of the eddy current. However, by forming the outer peripheral surface side heating auxiliary member 12 in a thin plate shape and laminating a plurality of sheets in this manner, generation of an eddy current in the outer peripheral surface side heating auxiliary member 12 itself can be suppressed. It can suppress that the heating assistance member 12 is heated unintentionally. In addition, the thickness of the thin plate and the number of layers can be appropriately changed according to the amount of power.

さらに、外周面側加熱補助部材１２が薄板状かつ複数枚積層され、さらにロータコアＣの周方向に分断され、かつ、そのロータコアＣの軸方向の一端面から他端面に亘って、その分断部分は延在している構造とすることにより、隣り合う外周面側加熱コイル保持部材１４の間に配設でき、外周面側加熱コイル１１に近づけることができる。すなわち、磁力線が透磁率の低い空気を介することを極力減らすことができる。なお、図１では、外周面側加熱コイル保持部材１４は８個設けてあるため、外周面側加熱補助部材１２も８個に分断しているが、この数は、外周面側加熱コイル保持部材１４の数によるものであれば、適宜変更可能である。 Further, the outer peripheral surface side heating assisting member 12 is laminated in a thin plate shape and plural sheets are further divided and further divided in the circumferential direction of the rotor core C, and the divided portion extends from one end face to the other end face in the axial direction By making it the structure which has extended, it can arrange | position between the adjacent outer peripheral surface side heating coil holding members 14, and can closely approach to the outer peripheral surface side heating coil 11. As shown in FIG. That is, it is possible to reduce as much as possible the magnetic force lines through the air of low permeability. In addition, in FIG. 1, since eight outer peripheral surface side heating coil holding members 14 are provided, although the outer peripheral surface side heating auxiliary member 12 is also divided into eight, this number is an outer peripheral surface side heating coil holding member If it is based on the number of 14, it can change suitably.

外周面側加熱補助部材１２は、空気よりも透磁率の高い部材を用いることが好ましく、例えば、高周波用電磁鋼板（電磁鋼板）や、ポリアイアン（株式会社トーキン製品名）等であるが、これに限定されない。ここで、透磁率とは、高周波誘導加熱によって生じる磁力線（磁界）が加熱対象を通過する際の、磁力線の通りやすさのことである。本実施の形態では、外周面側加熱補助部材１２として、透磁率が高い電磁鋼板からなる部材を用いている。 The outer peripheral surface side heating auxiliary member 12 is preferably a member having a magnetic permeability higher than that of air, for example, a high frequency electromagnetic steel sheet (electromagnetic steel sheet), a polyiron (product name of Tokin Corporation), etc. It is not limited to. Here, the magnetic permeability is the ease of passage of magnetic lines of force (magnetic field) generated by high frequency induction heating when passing through the object to be heated. In the present embodiment, a member made of an electromagnetic steel plate having a high magnetic permeability is used as the outer peripheral surface side heating assisting member 12.

図１に示すように、外周面側絶縁部材１３は、外周面側加熱補助部材１２の最内径側、換言すると、外周面側加熱補助部材１２の、外周面側加熱コイル１１に最も近い面に配設する。外周面側絶縁部材１３を設けることにより、外周面側加熱コイル１１と、外周面側加熱補助部材１２との間の短絡を防ぐことができる。外周面側加熱補助部材１２の、外周面側加熱コイル１１に最も近い面に設けた外周面側絶縁部材１３は、外周面側加熱コイル１１の高周波振動によって絶縁破損しない耐久性を備えた部材である。 As shown in FIG. 1, the outer peripheral surface side insulating member 13 is the innermost diameter side of the outer peripheral surface side heating auxiliary member 12, in other words, the surface of the outer peripheral surface side heating auxiliary member 12 closest to the outer peripheral surface heating coil 11. Arrange. By providing the outer peripheral surface side insulating member 13, a short circuit between the outer peripheral surface side heating coil 11 and the outer peripheral surface side heating assisting member 12 can be prevented. The outer peripheral surface side insulating member 13 provided on the surface closest to the outer peripheral surface side heating coil 11 of the outer peripheral surface side heating auxiliary member 12 is a member having a durability that does not cause insulation damage due to high frequency vibration of the outer peripheral surface side heating coil 11 is there.

本実施の形態では、外周面側絶縁部材１３として絶縁紙、ベークライト材、ＰＥＥＫ材、セラミック材などを用いることが好ましく、例えば、絶縁紙であるノーメックス紙（登録商標）を用いることができる。ただし、外周面側加熱コイル１１と、外周面側加熱補助部材１２との間の短絡を防ぎ、耐久性のある絶縁部材であれば、これに限定されない。 In the present embodiment, an insulating paper, a bakelite material, a PEEK material, a ceramic material or the like is preferably used as the outer peripheral surface side insulating member 13, and for example, Nomex paper (registered trademark) which is an insulating paper can be used. However, a short-circuit between the outer peripheral surface side heating coil 11 and the outer peripheral surface side heating assisting member 12 can be prevented and the insulating member is not limited to this as long as it is a durable insulating member.

図１の下部に示すのは、ロータコア加熱装置１の内周面側の拡大平面図である。
内周面側加熱コイル２１は、円筒状のロータコアＣの内周面側を加熱する加熱コイルである。内周面側加熱コイル２１の、加熱コイル２１ａと戻りコイル２１ｂとは、連結されている構造である。内周面側加熱コイル２１の構造の詳細は、後に図２を用いて説明する。 The lower part of FIG. 1 is an enlarged plan view of the inner peripheral surface side of the rotor core heating device 1.
The inner peripheral surface side heating coil 21 is a heating coil which heats the inner peripheral surface side of the cylindrical rotor core C. The heating coil 21a and the return coil 21b of the inner peripheral surface side heating coil 21 are connected. Details of the structure of the inner circumferential surface side heating coil 21 will be described later with reference to FIG.

内周面側加熱補助部材２２は、内周面側加熱コイル２１を用いたロータコアＣの加熱を補助するための部材である。図１の拡大図に示すように、内周面側加熱補助部材２２は、内周面側加熱コイル２１の加熱コイル２１ａと戻りコイル２１ｂとの間に配設されている。 The inner peripheral surface side heating assisting member 22 is a member for assisting the heating of the rotor core C using the inner peripheral surface heating coil 21. As shown in the enlarged view of FIG. 1, the inner peripheral surface side heating assisting member 22 is disposed between the heating coil 21 a and the return coil 21 b of the inner peripheral surface heating coil 21.

図１の拡大図に示すように、内周面側加熱補助部材２２は、内周面側加熱コイル２１の戻りコイル２１ｂを巻回している。外周面側加熱補助部材１２と同様に、内周面側加熱補助部材２２を薄い構造、より具体的には薄く巻回した構造とすることによって、内周面側加熱補助部材２２自体に渦電流が発生することを抑制できる。さらに、このような構造により、内周面側加熱コイル２１と内周面側加熱補助部材２２とが直接接触することを防ぐことができる。なお、内周面側加熱補助部材２２の巻回の回数は、内周面側加熱コイル２１と接触しない程度であれば、適宜変更可能である。 As shown in the enlarged view of FIG. 1, the inner peripheral surface side heating auxiliary member 22 winds a return coil 21 b of the inner peripheral surface side heating coil 21. Similar to the outer peripheral surface side heating auxiliary member 12, the eddy current is generated in the inner peripheral surface side heating auxiliary member 22 by making the inner peripheral surface side heating auxiliary member 22 have a thin structure, more specifically, a thinly wound structure. Can be suppressed. Further, with such a structure, it is possible to prevent the inner peripheral surface side heating coil 21 and the inner peripheral surface side heating assisting member 22 from being in direct contact with each other. The number of windings of the inner peripheral surface side heating auxiliary member 22 can be appropriately changed as long as it does not come in contact with the inner peripheral surface side heating coil 21.

内周面側加熱補助部材２２は、外周面側加熱補助部材１２と同様、空気より透磁率の高い部材を用いることが好ましく、例えば、電磁鋼板や、ポリアイアン等であるが、これに限定されない。換言すると、内周面側加熱補助部材２２は、透磁率が高く、加熱効率が上がる部材であればよい。本実施の形態では、外周面側加熱補助部材１２と同様、内周面側加熱補助部材２２についても、透磁率が高い電磁鋼板からなる部材を用いている。 It is preferable to use a member having a higher magnetic permeability than air as the inner peripheral surface side heating auxiliary member 22 like the outer peripheral surface side heating auxiliary member 12. For example, a magnetic steel plate, a polyiron, etc. are not limited to this. . In other words, the inner circumferential surface side heating assisting member 22 may be a member having high permeability and high heating efficiency. In the present embodiment, similarly to the outer peripheral surface side heating auxiliary member 12, as the inner peripheral surface heating auxiliary member 22, a member made of an electromagnetic steel plate having a high magnetic permeability is used.

内周面側絶縁部材２３は、絶縁部材２３ａと、絶縁部材２３ｂとからなる。絶縁部材２３ａは、内周面側加熱コイル２１の加熱コイル２１ａと内周面側加熱補助部材２２との間に配設し、さらに、絶縁部材２３ｂは、内周面側加熱補助部材２２と、内周面側加熱コイル２１の戻りコイル２１ｂとの間に配設する。換言すると、絶縁部材２３ａは、内周面側加熱補助部材２２を巻装するように配設し、絶縁部材２３ｂは、内周面側加熱コイル２１の戻りコイル２１ｂを巻装するように配設する。 The inner circumferential surface side insulating member 23 is composed of an insulating member 23a and an insulating member 23b. The insulating member 23a is disposed between the heating coil 21a of the inner peripheral surface side heating coil 21 and the inner peripheral surface side heating auxiliary member 22, and the insulating member 23b is the inner peripheral surface side heating auxiliary member 22; It is disposed between the inner circumferential surface side heating coil 21 and the return coil 21 b. In other words, the insulating member 23a is disposed to wind the inner peripheral surface side heating auxiliary member 22, and the insulating member 23b is disposed to wind the return coil 21b of the inner peripheral surface heating coil 21. Do.

外周面側と同様、上記のように内周面側絶縁部材２３を設けることにより、内周面側加熱コイル２１と、内周面側加熱補助部材２２との間の短絡を防ぐことができる。本実施の形態では、内周面側絶縁部材２３としては、絶縁紙、ベークライト材、ＰＥＥＫ材、セラミック材などを用いることが好ましく、例えば、絶縁紙であるノーメックス紙（登録商標）を用いることができる。ただし、内周面側加熱コイル２１と、内周面側加熱補助部材２２との間の短絡を防ぎ、耐久性のある絶縁部材であれば、これに限定されない。 By providing the inner peripheral surface side insulating member 23 as described above, as in the case of the outer peripheral surface side, a short circuit between the inner peripheral surface side heating coil 21 and the inner peripheral surface side heating assisting member 22 can be prevented. In the present embodiment, it is preferable to use an insulating paper, a bakelite material, a PEEK material, a ceramic material or the like as the inner peripheral surface side insulating member 23, and for example, Nomex paper (registered trademark) which is an insulating paper is used. it can. However, a short-circuit between the inner peripheral surface side heating coil 21 and the inner peripheral surface side heating assisting member 22 can be prevented and the insulating member is not limited to this as long as it is a durable insulating member.

図２は、実施の形態にかかるロータコア加熱装置１の内周面側加熱コイル２１の正面拡大図である。なお、図２では、内周面側加熱コイル２１の説明のため、内周面側加熱補助部材２２と内周面側絶縁部材２３とは省略して示している。図２に示すように、内周面側加熱コイル２１は、螺旋状の加熱コイル２１ａと、加熱コイル２１ａの中央部を軸方向に貫通する戻りコイル２１ｂと、を備える。加熱コイル２１ａと戻りコイル２１ｂとは電気的に接続されており、高周波電流を通す。 FIG. 2 is an enlarged front view of the inner peripheral surface side heating coil 21 of the rotor core heating device 1 according to the embodiment. In FIG. 2, the inner peripheral surface side heating auxiliary member 22 and the inner peripheral surface side insulating member 23 are omitted for the purpose of describing the inner peripheral surface side heating coil 21. As shown in FIG. 2, the inner peripheral surface side heating coil 21 includes a helical heating coil 21 a and a return coil 21 b axially penetrating the central portion of the heating coil 21 a. The heating coil 21a and the return coil 21b are electrically connected to each other to pass a high frequency current.

図３は、図１のＩＩＩ−ＩＩＩ線に沿う、実施の形態にかかるロータコア加熱装置１の側面断面図である。
図３に示すように、外周面側加熱コイル１１の外側、すなわち外周面側加熱コイル１１の周囲に発生した磁力線（黒矢印）の通り道に、外周面側加熱補助部材１２を配設する。外周面側加熱補助部材１２は、本実施の形態では、透磁率が高い電磁鋼板からなる。よって、一般に透磁率が低い空気に比べ、外周面側加熱補助部材１２は磁力線（磁界）を通しやすい。 FIG. 3 is a side cross-sectional view of the rotor core heating device 1 according to the embodiment, taken along the line III-III of FIG.
As shown in FIG. 3, the outer peripheral surface side heating auxiliary member 12 is disposed on the outer side of the outer peripheral surface side heating coil 11, that is, along the path of magnetic lines of force (black arrows) generated around the outer peripheral surface side heating coil 11. In the present embodiment, the outer peripheral surface side heating assisting member 12 is made of an electromagnetic steel plate having a high magnetic permeability. Therefore, the outer peripheral surface side heating assisting member 12 can easily pass the magnetic lines of force (magnetic field) compared to air generally having a low permeability.

図３に示すように、外周面側と同様に、内周面側加熱コイル２１の内側、すなわち内周面側加熱コイル２１の周囲に発生した磁力線（黒矢印）の通り道に、内周面側加熱補助部材２２を配設する。外周面側と同様、内周面側加熱補助部材２２も、本実施の形態では、透磁率が高い電磁鋼板からなる。よって、一般に透磁率が低い空気に比べ、外周面側加熱補助部材１２は磁力線（磁界）を通しやすい。 As shown in FIG. 3, as in the outer peripheral surface side, the inner peripheral surface side is located on the inner side of the inner peripheral surface side heating coil 21, that is, on the path of magnetic lines of force (black arrows) generated around the inner peripheral surface heating coil 21. The heating assisting member 22 is disposed. Similar to the outer peripheral surface side, the inner peripheral surface side heating auxiliary member 22 is also made of an electromagnetic steel plate having a high magnetic permeability in the present embodiment. Therefore, the outer peripheral surface side heating assisting member 12 can easily pass the magnetic lines of force (magnetic field) compared to air generally having a low permeability.

従来のようなロータコアの加熱では、ロータコアの内周面側と外周面側との両方に加熱コイルを配置し加熱する。しかしながら、高周波誘導加熱によって生じる磁界が、透磁率の低い空気を介してロータコアに到達するため、加熱効率が低いという問題があった。 In the conventional heating of the rotor core, heating coils are disposed and heated on both the inner peripheral surface side and the outer peripheral surface side of the rotor core. However, there is a problem that the heating efficiency is low because the magnetic field generated by the high frequency induction heating reaches the rotor core through the air with low permeability.

本実施の形態にかかるロータコア加熱装置１は、ロータコアＣの外周面側および内周面側を高周波誘導加熱するロータコア加熱装置１であって、外周面側に配設された加熱コイル１１の外側と、内周面側に配設された加熱コイル２１の内側のいずれか一方又は双方に、電磁鋼板からなる加熱補助部材を備え、加熱コイルと加熱補助部材とは、絶縁部材によって絶縁されている。このような構成により、加熱補助部材は一般に透磁率が低い空気に比べ、磁力線（磁界）を通しやすく、磁力線が空気を通過することによって生じていたロータコアの加熱効率の低下を抑制することができる。すなわち、より低い電力を用いて効率的にロータコアへ磁力線（磁界）を作用させることができ、加熱時間を短縮することができる。さらに、加熱時間を短縮できることから、加熱ステーション（加熱工程数）の削減や、コストの低減も可能である。 The rotor core heating device 1 according to the present embodiment is a rotor core heating device 1 that performs high frequency induction heating on the outer peripheral surface side and the inner peripheral surface side of the rotor core C, and the outer side of the heating coil 11 disposed on the outer peripheral surface A heating assisting member made of an electromagnetic steel sheet is provided on one or both of the inner sides of the heating coil 21 disposed on the inner peripheral surface side, and the heating coil and the heating assisting member are insulated by the insulating member. With such a configuration, the heating assisting member can easily pass the magnetic lines of force (magnetic field) compared to air having a low magnetic permeability, and can suppress the decrease in heating efficiency of the rotor core caused by the passage of the magnetic lines of air. . That is, magnetic lines of force (magnetic field) can be efficiently applied to the rotor core using lower power, and the heating time can be shortened. Furthermore, since the heating time can be shortened, the number of heating stations (the number of heating steps) can be reduced and the cost can be reduced.

次に、本発明の実施例について説明する。
以下、実施例に基づき本発明を具体的に説明するが、本発明はこれらの実施例のみに限定されるものではない。 Next, examples of the present invention will be described.
EXAMPLES Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited to these examples.

図４は、実施例にかかるロータコア加熱装置を用いてロータコアを加熱した際の加熱効率を示すグラフである。シャフトをロータコアＣに焼き嵌めをする際に、ロータコアＣの内側を加熱によって拡張する必要がある。図４に示すグラフは、ロータコアＣの内側の拡張量を確保するために必要な電力を電力計によって測定し、その加熱効率を示したものである。 FIG. 4 is a graph showing the heating efficiency when the rotor core is heated using the rotor core heating device according to the example. When shrink-fitting the shaft to the rotor core C, the inside of the rotor core C needs to be expanded by heating. The graph shown in FIG. 4 measures the power required to secure the amount of expansion inside the rotor core C with a power meter, and shows the heating efficiency.

図４のグラフのｘ軸に示す「従来」とは、加熱補助部材を設けずに加熱を行った場合である。本実施例では、加熱補助部材を設けない「従来」の場合と、透磁率が高い「ポリアイアン」及び「電磁鋼板」を加熱補助部材として配設した場合との、それぞれについて、加熱効率の測定を行った。ここで、加熱効率１００％とは、使用した電力が途中で失われることなく、すべて内径の拡張のための加熱に使われた場合である。図４のグラフに示すように、従来の場合は加熱効率は５３％程度であった。それに対し、ポリアイアンを用いた場合は、加熱効率は７５％程度に上昇し、電磁鋼板を用いた場合は、加熱効率は８６％程度に上昇した。 The “conventional” shown on the x-axis of the graph of FIG. 4 is the case where heating is performed without providing the heating auxiliary member. In this embodiment, the heating efficiency is measured for the case of "conventional" not provided with the heating assisting member and for the case where the "polyiron" and "magnetic steel sheet" having high magnetic permeability are disposed as the heating assisting member. Did. Here, 100% of heating efficiency is a case where all the used electric power is used for heating for expansion of an internal diameter, without being lost on the way. As shown in the graph of FIG. 4, the heating efficiency was about 53% in the conventional case. On the other hand, when polyiron was used, the heating efficiency rose to about 75%, and when the magnetic steel sheet was used, the heating efficiency rose to about 86%.

以上の結果が示すように、透磁率の高い加熱補助部材を、ロータコア加熱装置１の外周面側加熱コイル１１の外側、内周面側加熱コイル２１の内側にそれぞれ設けることにより、従来のように、高周波誘導加熱によって生じる磁界が、透磁率の低い空気を介してロータコアＣに到達する場合よりも、多くの磁界がロータコアＣに到達しているといえる。すなわち、加熱補助部材としてポリアイアンを用いた場合は、ロータコアＣにおいて渦電流が多く発生し、加熱効率を上昇させることができた。さらに、加熱補助部材として電磁鋼板を用いた場合は、ポリアイアンを用いた場合と比べ、より加熱の効率を上昇させることができた。 As the above results show, by providing the heating assisting member having high permeability to the outer side of the outer peripheral surface side heating coil 11 of the rotor core heating device 1 and the inner side of the inner peripheral surface side heating coil 21 as in the conventional case. It can be said that more magnetic field reaches the rotor core C than in the case where the magnetic field generated by the high frequency induction heating reaches the rotor core C via the low permeability air. That is, when a polyiron was used as the heating auxiliary member, a large amount of eddy current was generated in the rotor core C, and the heating efficiency could be increased. Furthermore, when a magnetic steel sheet was used as a heating assistance member, the efficiency of heating was able to be raised more compared with the case where a polyiron is used.

以上、本発明を上記実施の形態に即して説明したが、本発明は上記実施の形態の構成にのみ限定されるものではなく、本願特許請求の範囲の請求項の発明の範囲内で当業者であればなし得る各種変形、修正、組み合わせを含むことは勿論である。 As mentioned above, although the present invention was explained according to the above-mentioned embodiment, the present invention is not limited only to the composition of the above-mentioned embodiment, It is within the range of the invention of the claim of the present claim. Of course, it includes various modifications, modifications, and combinations that can be made by a vendor.

１ロータコア加熱装置
１１外周面側加熱コイル
１２外周面側加熱補助部材
１３外周面側絶縁部材
１４外周面側加熱コイル保持部材
２１内周面側加熱コイル
２１ａ加熱コイル
２１ｂ戻りコイル
２２内周面側加熱補助部材
２３内周面側絶縁部材
２３ａ、２３ｂ絶縁部材
Ｃロータコア DESCRIPTION OF SYMBOLS 1 rotor core heating device 11 outer peripheral surface side heating coil 12 outer peripheral surface side heating auxiliary member 13 outer peripheral surface side insulating member 14 outer peripheral surface side heating coil holding member 21 inner peripheral surface heating coil 21a heating coil 21b return coil 22 inner peripheral surface heating Auxiliary member 23 Inner circumferential surface side insulating members 23a and 23b Insulating member C Rotor core

Claims

A rotor core heating apparatus for performing high frequency induction heating on an outer peripheral surface side and an inner peripheral surface side of a rotor core, comprising:
A heating assisting member made of an electromagnetic steel sheet is provided on either or both of the outer side of the heating coil disposed on the outer peripheral surface side and the inner side of the heating coil disposed on the inner peripheral surface side,
The heating coil and the heating assisting member are insulated by an insulating member,
Rotor core heating device.