JP6801394B2 - Rotor core heating device - Google Patents

Rotor core heating device Download PDF

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JP6801394B2
JP6801394B2 JP2016228202A JP2016228202A JP6801394B2 JP 6801394 B2 JP6801394 B2 JP 6801394B2 JP 2016228202 A JP2016228202 A JP 2016228202A JP 2016228202 A JP2016228202 A JP 2016228202A JP 6801394 B2 JP6801394 B2 JP 6801394B2
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rotor core
temperature
coil
outer peripheral
inner peripheral
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JP2018085256A (en
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芳賀　正宜
正宜 芳賀
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は、ロータコアの加熱装置に関する。 The present invention relates to a rotor core heating device.

特許文献１には、ロータコアの内周側に配置された内周側コイルと、ロータコアの外周側に配置された外周側コイルとに交流電流を供給することによって、ロータコアに誘導電流を発生させ、ロータコアを加熱する技術が記載されている。 In Patent Document 1, an induced current is generated in the rotor core by supplying an alternating current to the inner peripheral coil arranged on the inner peripheral side of the rotor core and the outer peripheral coil arranged on the outer peripheral side of the rotor core. Techniques for heating the rotor core are described.

特開２０１５−０８４３１２号公報Japanese Unexamined Patent Publication No. 2015-084312

通常、特許文献１に記載の内周側コイルと外周側コイルは、直列に接続されている。そして、内周側コイル及び外周側コイルには、当該電源から同じタイミングで交流電流が供給される。一方、ロータコアの内径側は、ロータコアの外径側よりも温度上昇率が低い。そのため、内周側コイルと外周側コイルとに同時に交流電流が供給されると、ロータコアの内径側の昇温と外径側の昇温とがアンバランス（不均衡）になってしまう。そこで、従来では、ロータコアの外径側が目標温度を超えて制限温度に到達した後、ロータコアの内径側が目標温度に到達するように、電流を断続的に供給する制御を行う。そのため、電流を遮断している時間によって、ロータコアの内径側の温度が目標温度に到達する時間（昇温時間）が増加してしまうという問題がある。 Usually, the inner peripheral side coil and the outer peripheral side coil described in Patent Document 1 are connected in series. Then, an alternating current is supplied from the power source to the inner peripheral coil and the outer coil at the same timing. On the other hand, the temperature rise rate on the inner diameter side of the rotor core is lower than that on the outer diameter side of the rotor core. Therefore, if an alternating current is supplied to the inner peripheral coil and the outer coil at the same time, the temperature rise on the inner diameter side and the temperature rise on the outer diameter side of the rotor core become unbalanced. Therefore, conventionally, after the outer diameter side of the rotor core exceeds the target temperature and reaches the limit temperature, the current is intermittently supplied so that the inner diameter side of the rotor core reaches the target temperature. Therefore, there is a problem that the time for the temperature on the inner diameter side of the rotor core to reach the target temperature (heating time) increases depending on the time during which the current is cut off.

本発明は、このような問題を解決するためになされたものであり、昇温時間をより短縮することができるロータコアの加熱装置を提供することを目的とするものである。 The present invention has been made to solve such a problem, and an object of the present invention is to provide a rotor core heating device capable of further shortening the heating time.

本発明に係るロータコアの加熱装置は、中空円柱状に形成されるロータコアの内周側に配置される内周側コイルと、前記ロータコアの外周側に配置される外周側コイルと、に電流を供給することにより、前記ロータコアを加熱するロータコアの加熱装置である。また、ロータコアの加熱装置は、前記ロータコアの内周面の温度と前記ロータコアの外周面の温度とを監視する温度監視手段と、前記温度監視手段によって監視された前記内周面の温度と前記外周面の温度とに基づいて、前記内周側コイルへの電流供給と前記外周側コイルへの電流供給とを切り替える切替手段と、を備える。 The rotor core heating device according to the present invention supplies an electric current to an inner peripheral coil arranged on the inner peripheral side of the rotor core formed in a hollow columnar shape and an outer peripheral coil arranged on the outer peripheral side of the rotor core. This is a rotor core heating device that heats the rotor core. Further, the rotor core heating device includes a temperature monitoring means for monitoring the temperature of the inner peripheral surface of the rotor core and the temperature of the outer peripheral surface of the rotor core, and the temperature of the inner peripheral surface and the outer peripheral surface monitored by the temperature monitoring means. A switching means for switching between the current supply to the inner peripheral coil and the current supply to the outer peripheral coil based on the surface temperature is provided.

本発明に係るロータコアの加熱装置によれば、ロータコアの内周面の温度と外周面の温度とに基づいて、内周側コイルへの電流供給と外周側コイルへの電流供給とが切り替えられる。そのため、ロータコアの内径側の昇温と外径側の昇温とがアンバランス（不均衡）になってしまうのを防ぐように、内周側コイルへの電流供給と外周側コイルへの電流供給とを切り替えることができる。これにより、昇温時間をより短縮することができるロータコアの加熱装置を提供することができる。 According to the rotor core heating device according to the present invention, the current supply to the inner peripheral side coil and the current supply to the outer peripheral side coil can be switched based on the temperature of the inner peripheral surface and the temperature of the outer peripheral surface of the rotor core. Therefore, the current is supplied to the inner peripheral coil and the current is supplied to the outer peripheral coil so as to prevent the temperature rise on the inner diameter side and the temperature rise on the outer diameter side of the rotor core from becoming unbalanced. And can be switched. This makes it possible to provide a rotor core heating device capable of further shortening the heating time.

本発明の実施の形態１に係るロータコアの加熱装置を簡略的に示す側方から見た断面図である。It is sectional drawing which saw from the side simply showing the heating apparatus of the rotor core which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係るロータコアの加熱装置における内周側コイル及び外周側コイルに電流を供給する電気回路を簡略的に示す図である。It is a figure which shows simply the electric circuit which supplies the electric current to the inner peripheral side coil and the outer peripheral side coil in the heating apparatus of the rotor core which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る内周側コイル及び外周側コイルへの電流供給のタイミングチャートと、ロータコアの内径側の温度及び外径側の温度の時間変化を示すグラフである。It is a timing chart of the current supply to the inner peripheral side coil and the outer peripheral side coil which concerns on Embodiment 1 of this invention, and is a graph which shows the time change of the temperature of the inner diameter side and the temperature of the outer diameter side of a rotor core. 従来のロータコアの加熱装置における内周側コイル及び外周側コイルに電流を供給する電気回路を簡略的に示す図である。It is a figure which shows simply showing the electric circuit which supplies the electric current to the inner peripheral side coil and the outer peripheral side coil in the heating device of the conventional rotor core. 従来の内周側コイル及び外周側コイルへの電流供給のタイミングチャートと、ロータコアの内径側の温度及び外径側の温度の時間変化を示すグラフである。It is the timing chart of the current supply to the conventional inner circumference side coil and the outer circumference side coil, and the graph which shows the time change of the temperature of the inner diameter side and the temperature of the outer diameter side of a rotor core.

実施の形態１
以下、図面を参照して本発明の実施の形態について説明する。図１は、本発明の実施の形態１に係るロータコア２００の加熱装置１００を簡略的に示す側方から見た断面図である。なお、図１において、内周側コイル１及び外周側コイル２の断面を示すハッチングは省略されている。また、図２は、実施の形態１に係るロータコア２００の加熱装置１００における内周側コイル１及び外周側コイル２に電流を供給する電気回路を簡略的に示す図である。 Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of the heating device 100 of the rotor core 200 according to the first embodiment of the present invention, which is simply shown. Note that in FIG. 1, hatching showing a cross section of the inner peripheral coil 1 and the outer peripheral coil 2 is omitted. Further, FIG. 2 is a diagram simply showing an electric circuit for supplying an electric current to the inner peripheral side coil 1 and the outer peripheral side coil 2 in the heating device 100 of the rotor core 200 according to the first embodiment.

実施の形態１に係るロータコア２００の加熱装置１００は、内周側コイル１、外周側コイル２、高周波電源３、切替手段としての切替スイッチ４、温度監視手段５等を備える。
また、ロータコア２００は、中空円柱状に形成されている。換言すれば、ロータコア２００は、円柱の略中央に貫通孔２０１が形成された形状を有する。ロータコア２００は、例えば、複数の鋼板が積層されて構成されている。
そして、ロータコア２００の加熱装置１００は、例えば、ロータコア２００に挿嵌されるシャフト（図示省略）を焼き嵌めするために、ロータコア２００を加熱する。 The heating device 100 of the rotor core 200 according to the first embodiment includes an inner peripheral coil 1, an outer peripheral coil 2, a high frequency power supply 3, a changeover switch 4 as a changeover means, a temperature monitoring means 5, and the like.
Further, the rotor core 200 is formed in a hollow columnar shape. In other words, the rotor core 200 has a shape in which a through hole 201 is formed substantially in the center of the cylinder. The rotor core 200 is configured by, for example, laminating a plurality of steel plates.
Then, the heating device 100 of the rotor core 200 heats the rotor core 200, for example, in order to shrink-fit a shaft (not shown) to be inserted into the rotor core 200.

内周側コイル１は、ロータコア２００の軸を螺旋軸とする螺旋状に形成され、ロータコア２００の内周側に配置される。つまり、内周側コイル１は、ロータコア２００の貫通孔２０１内に配置される。また、内周側コイル１の螺旋の直径は、貫通孔２０１の直径より小さい。 The inner peripheral side coil 1 is formed in a spiral shape with the axis of the rotor core 200 as a spiral axis, and is arranged on the inner peripheral side of the rotor core 200. That is, the inner peripheral side coil 1 is arranged in the through hole 201 of the rotor core 200. Further, the diameter of the spiral of the inner peripheral coil 1 is smaller than the diameter of the through hole 201.

外周側コイル２は、ロータコア２００の軸を螺旋軸とする螺旋状に形成され、ロータコア２００の外周側に配置される。つまり、外周側コイル２の螺旋の内側にロータコア２００が配置される。また、外周側コイル２の螺旋の直径は、ロータコア２００の外径より大きい。 The outer peripheral coil 2 is formed in a spiral shape with the axis of the rotor core 200 as a spiral axis, and is arranged on the outer peripheral side of the rotor core 200. That is, the rotor core 200 is arranged inside the spiral of the outer peripheral coil 2. Further, the diameter of the spiral of the outer peripheral coil 2 is larger than the outer diameter of the rotor core 200.

高周波電源３は、内周側コイル１と外周側コイル２とに交流電流を供給する。また、高周波電源３と、内周側コイル１とは、切替スイッチ４を介して接続されている。また、高周波電源３と、外周側コイル２とは、切替スイッチ４を介して接続されている。換言すれば、高周波電源３は、内周側コイル１と外周側コイル２のうち、切替スイッチ４によって接続された方に、交流電流を供給する。 The high-frequency power supply 3 supplies an alternating current to the inner peripheral coil 1 and the outer peripheral coil 2. Further, the high frequency power supply 3 and the inner peripheral side coil 1 are connected via a changeover switch 4. Further, the high frequency power supply 3 and the outer peripheral coil 2 are connected via a changeover switch 4. In other words, the high-frequency power supply 3 supplies an alternating current to the inner peripheral side coil 1 and the outer peripheral side coil 2 connected by the changeover switch 4.

切替スイッチ４は、内周側コイル１と外周側コイル２とを切り替えて、高周波電源３と接続する。これにより、切替スイッチ４は、高周波電源３からの内周側コイル１への電流供給と、高周波電源３からの外周側コイル２への電流供給とを切り替える。
また、切替スイッチ４は、後述する温度監視手段５から入力される制御信号に従って、内周側コイル１と外周側コイル２とを切り替えて、高周波電源３と接続する。具体的には、切替スイッチ４は、温度監視手段５によって監視されたロータコア２００の内周面の温度と外周面の温度とに基づいて、高周波電源３からの内周側コイル１への電流供給と、高周波電源３からの外周側コイル２への電流供給とを切り替える。 The changeover switch 4 switches between the inner peripheral side coil 1 and the outer peripheral side coil 2 and connects to the high frequency power supply 3. As a result, the changeover switch 4 switches between the current supply from the high frequency power supply 3 to the inner peripheral coil 1 and the current supply from the high frequency power supply 3 to the outer peripheral coil 2.
Further, the changeover switch 4 switches between the inner peripheral side coil 1 and the outer peripheral side coil 2 according to a control signal input from the temperature monitoring means 5 described later, and connects to the high frequency power supply 3. Specifically, the changeover switch 4 supplies a current from the high-frequency power supply 3 to the inner peripheral coil 1 based on the temperature of the inner peripheral surface and the temperature of the outer peripheral surface of the rotor core 200 monitored by the temperature monitoring means 5. And the current supply from the high frequency power supply 3 to the outer coil 2 is switched.

温度監視手段５は、ロータコア２００の内周面及び外周面に設けられた接触式温度計、非接触式温度計等であり、ロータコア２００の内周面の温度と外周面の温度とを監視する。また、温度監視手段５は、ロータコア２００の内周面の温度と外周面の温度とに基づいて、切替スイッチ４に、内周側コイル１と外周側コイル２との何れかを高周波電源３と接続するための制御信号を入力する。 The temperature monitoring means 5 is a contact type thermometer, a non-contact type thermometer, or the like provided on the inner peripheral surface and the outer peripheral surface of the rotor core 200, and monitors the temperature of the inner peripheral surface and the temperature of the outer peripheral surface of the rotor core 200. .. Further, the temperature monitoring means 5 sets one of the inner peripheral coil 1 and the outer peripheral coil 2 to the high frequency power supply 3 on the changeover switch 4 based on the temperature of the inner peripheral surface and the temperature of the outer peripheral surface of the rotor core 200. Input the control signal for connection.

具体的には、温度監視手段５は、例えば、監視した内周面の温度の時間変化から内径側の昇温速度を推定し、監視した外周面の温度の時間変化から外径側の昇温速度を推定し、推定した内径側の昇温速度及び外径側の昇温速度に基づいて、内周側コイル１と外周側コイル２とに電流を供給する時間のＤｕｔｙ比を決定し、当該Ｄｕｔｙ比に基づいて、切替スイッチ４に、内周側コイル１と外周側コイル２とを切り替えて、高周波電源３と接続するための制御信号を入力する。 Specifically, the temperature monitoring means 5 estimates, for example, the rate of temperature rise on the inner diameter side from the time change of the temperature of the monitored inner peripheral surface, and raises the temperature of the outer diameter side from the time change of the temperature of the monitored outer peripheral surface. The speed is estimated, and based on the estimated temperature rise rate on the inner diameter side and the temperature rise rate on the outer diameter side, the duty ratio of the time for supplying the current to the inner peripheral side coil 1 and the outer peripheral side coil 2 is determined. Based on the Duty ratio, the changeover switch 4 is switched between the inner peripheral side coil 1 and the outer peripheral side coil 2 and inputs a control signal for connecting to the high frequency power supply 3.

また、温度監視手段５は、ロータコア２００の内径側の昇温と外径側の昇温とがアンバランス（不均衡）になってしまうのを防ぐように、当該Ｄｕｔｙ比を決定する。例えば、温度監視手段５は、ロータコア２００の内周面の温度と外周面の温度とが、それぞれの目標温度にほぼ同時に到達するように、推定した内径側の昇温速度及び外径側の昇温速度に基づいて、Ｄｕｔｙ比を決定する。これにより、昇温時間をより短縮することができるロータコア２００の加熱装置１００を提供することができる。 Further, the temperature monitoring means 5 determines the duty ratio so as to prevent the temperature rise on the inner diameter side and the temperature rise on the outer diameter side of the rotor core 200 from becoming unbalanced. For example, in the temperature monitoring means 5, the temperature rise rate on the inner diameter side and the rise on the outer diameter side are estimated so that the temperature of the inner peripheral surface and the temperature of the outer peripheral surface of the rotor core 200 reach their respective target temperatures almost at the same time. The duty ratio is determined based on the temperature rate. Thereby, it is possible to provide the heating device 100 of the rotor core 200 which can further shorten the heating time.

例えば、温度監視手段５は、図３のタイミングチャートに示すように、内周側コイル１に電流を供給する時間と外周側コイル２に電流を供給する時間のＤｕｔｙ比が約７対３となるように、切替スイッチ４に、内周側コイル１と外周側コイル２とを切り替えて、高周波電源３と接続するための制御信号を入力する。これにより、図３の下の２つのグラフに示すように、ロータコア２００の内周面の温度と外周面の温度とが、それぞれの目標温度にほぼ同時に到達する。 For example, in the temperature monitoring means 5, as shown in the timing chart of FIG. 3, the duty ratio of the time for supplying the current to the inner peripheral coil 1 and the time for supplying the current to the outer peripheral coil 2 is about 7: 3. As described above, a control signal for switching between the inner peripheral coil 1 and the outer peripheral coil 2 and connecting to the high frequency power supply 3 is input to the changeover switch 4. As a result, as shown in the two graphs at the bottom of FIG. 3, the temperature of the inner peripheral surface and the temperature of the outer peripheral surface of the rotor core 200 reach their respective target temperatures almost at the same time.

図４に、従来のロータコアの加熱装置における内周側コイル６及び外周側コイル７に電流を供給する電気回路を簡略的に示す。従来のロータコアの加熱装置では、内周側コイル６と外周側コイル７とが直列に接続されており、同じタイミングで、高周波電源８から交流電流が供給される。 FIG. 4 briefly shows an electric circuit that supplies an electric current to the inner peripheral coil 6 and the outer peripheral coil 7 in a conventional rotor core heating device. In the conventional rotor core heating device, the inner peripheral side coil 6 and the outer peripheral side coil 7 are connected in series, and an alternating current is supplied from the high frequency power supply 8 at the same timing.

従来のロータコアの加熱装置では、内周側コイル６と外周側コイル７とに、高周波電源８から交流電流が同時に供給されるため、図５の下の２つのグラフに示すように、ロータコア２００の内径側の温度より外径側の温度が早く目標温度に到達する。これは、外周側コイル７の内側に磁束が集中しやすく、内周側コイル６の外側には磁束が集中しにくいため、ロータコア２００の外径側よりも内径側の方が昇温しにくいためである。そこで、従来では、ロータコア２００の外径側の温度が目標温度を超えて制限温度に到達した後、図５のタイミングチャートに示すように、電流を断続的に供給し、外径側の温度が制限温度よりも高くに上がりすぎないようにしながら、内径側の温度を徐々に昇温させていた。そのため、ロータコア２００の昇温に時間がかかってしまうという問題が生じていた。 In the conventional rotor core heating device, alternating current is simultaneously supplied from the high frequency power supply 8 to the inner peripheral side coil 6 and the outer peripheral side coil 7, and therefore, as shown in the two graphs at the bottom of FIG. 5, the rotor core 200 The temperature on the outer diameter side reaches the target temperature earlier than the temperature on the inner diameter side. This is because the magnetic flux tends to concentrate on the inside of the outer peripheral coil 7, and the magnetic flux does not easily concentrate on the outer side of the inner coil 6, so that the temperature rises more on the inner diameter side than on the outer diameter side of the rotor core 200. Is. Therefore, conventionally, after the temperature on the outer diameter side of the rotor core 200 exceeds the target temperature and reaches the limit temperature, a current is intermittently supplied as shown in the timing chart of FIG. 5, and the temperature on the outer diameter side is raised. The temperature on the inner diameter side was gradually raised while preventing the temperature from rising too high above the limit temperature. Therefore, there is a problem that it takes time to raise the temperature of the rotor core 200.

一方、本実施の形態１に係るロータコア２００の加熱装置１００では、ロータコア２００の内周面の温度と外周面の温度とに基づいて、内周側コイル１への電流供給と外周側コイル２への電流供給とが切り替えられる。そのため、ロータコア２００の内径側の昇温と外径側の昇温とがアンバランス（不均衡）になってしまうのを防ぐように、内周側コイル１への電流供給と外周側コイル２への電流供給とを切り替えることができる。これにより、昇温時間をより短縮することができるロータコア２００の加熱装置１００を提供することができる。 On the other hand, in the heating device 100 of the rotor core 200 according to the first embodiment, the current is supplied to the inner peripheral coil 1 and the outer peripheral coil 2 is supplied based on the temperature of the inner peripheral surface and the temperature of the outer peripheral surface of the rotor core 200. The current supply is switched. Therefore, in order to prevent the temperature rise on the inner diameter side and the temperature rise on the outer diameter side of the rotor core 200 from becoming unbalanced, the current is supplied to the inner peripheral side coil 1 and the outer diameter side coil 2 is supplied. It is possible to switch between the current supply and the current supply. Thereby, it is possible to provide the heating device 100 of the rotor core 200 which can further shorten the heating time.

また、ロータコア２００の外周面の温度が目標温度を超えて制限温度までに昇温されずに済む。 Further, the temperature of the outer peripheral surface of the rotor core 200 does not exceed the target temperature and does not rise to the limit temperature.

なお、本発明は上記実施の形態に限られたものではなく、趣旨を逸脱しない範囲で適宜変更することが可能である。 The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit.

１、６ 内周側コイル
２、７ 外周側コイル
３、８ 高周波電源
４ 切替スイッチ（切替手段）
５ 温度監視手段
１００ 加熱装置
２００ ロータコア
２０１ 貫通孔 1, 6 Inner circumference side coil 2, 7 Outer circumference side coil 3, 8 High frequency power supply 4 Changeover switch (switching means)
5 Temperature monitoring means 100 Heating device 200 Rotor core 201 Through hole

Claims (1)

中空円柱状に形成されるロータコアの内周側に配置される内周側コイルと、前記ロータコアの外周側に配置される外周側コイルと、に電流を供給することにより、前記ロータコアを加熱するロータコアの加熱装置であって、
前記ロータコアの内周面の温度と前記ロータコアの外周面の温度とを監視する温度監視手段と、
前記外周側コイルと前記内周側コイルとを切り替えて高周波電源に接続する切り替えスイッチと、
を備え、
前記切り替えスイッチは、前記温度監視手段によって監視された前記内周面の温度と前記外周面の温度とに基づいて、前記高周波電源からの前記内周側コイルへの電流供給と前記外周側コイルへの電流供給とを切り替え、
前記温度監視手段は、監視した前記内周面の温度の時間変化から内径側の昇温速度を推定し、監視した外周面の温度の時間変化から外径側の昇温速度を推定し、推定した前記内径側の昇温速度及び前記外径側の昇温速度に基づいて、前記内周側コイルと前記外周側コイルとに電流を供給する時間のＤｕｔｙ比を決定し、前記Ｄｕｔｙ比に基づいて、前記切り替えスイッチは、前記内周側コイルへの電流供給と前記外周側コイルへの電流供給とを切り替える、ロータコアの加熱装置。 A rotor core that heats the rotor core by supplying an electric current to an inner peripheral coil arranged on the inner peripheral side of the rotor core formed in a hollow columnar shape and an outer peripheral coil arranged on the outer peripheral side of the rotor core. It is a heating device of
A temperature monitoring means for monitoring the temperature of the inner peripheral surface of the rotor core and the temperature of the outer peripheral surface of the rotor core, and
A changeover switch that switches between the outer peripheral coil and the inner coil and connects to a high-frequency power supply.
With
The changeover switch supplies current from the high-frequency power supply to the inner peripheral coil and to the outer peripheral coil based on the temperature of the inner peripheral surface and the temperature of the outer peripheral surface monitored by the temperature monitoring means. switch between the current supply of,
The temperature monitoring means estimates the temperature rise rate on the inner diameter side from the time change of the monitored inner peripheral surface temperature, and estimates and estimates the temperature rise rate on the outer diameter side from the time change of the monitored outer peripheral surface temperature. Based on the temperature rise rate on the inner diameter side and the temperature rise rate on the outer diameter side, the duty ratio of the time for supplying the current to the inner peripheral side coil and the outer peripheral side coil is determined, and based on the duty ratio. The changeover switch is a rotor core heating device that switches between supplying a current to the inner peripheral coil and supplying a current to the outer peripheral coil .
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