JP2001016896A - Power converter - Google Patents
Power converterInfo
- Publication number
- JP2001016896A JP2001016896A JP11177677A JP17767799A JP2001016896A JP 2001016896 A JP2001016896 A JP 2001016896A JP 11177677 A JP11177677 A JP 11177677A JP 17767799 A JP17767799 A JP 17767799A JP 2001016896 A JP2001016896 A JP 2001016896A
- Authority
- JP
- Japan
- Prior art keywords
- ground
- induction motor
- inverter
- power converter
- bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電力変換装置に係わ
り、特に誘導電動機から負荷を介して大地へ至る漏れ電
流に起因する軸受けの電蝕に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power converter, and more particularly, to an electric corrosion of a bearing caused by a leakage current from an induction motor to the ground via a load.
【０００２】[0002]
【従来の技術】従来の電力変換装置は図５に示される。
図５はその一例を示す説明図で、１は電源、２はインバ
ータ、３は交流リアクトル又は同相コア、４は誘導電動
機、５は負荷（連結機械）、６から８はインピーダン
ス、９は軸受けである。図５において、誘導電動機４の
回転軸にはベアリングを介した軸受けによって負荷５に
連結されている。また、数十から数百ＫＨＺの高周波に
伴う漏れ電流は、矢印Ａ,Ｂに示すごとく、誘導電動機
４を介する系統と負荷５を介する系統がある。2. Description of the Related Art A conventional power converter is shown in FIG.
FIG. 5 is an explanatory view showing an example, wherein 1 is a power supply, 2 is an inverter, 3 is an AC reactor or in-phase core, 4 is an induction motor, 5 is a load (coupled machine), 6 to 8 are impedances, and 9 is a bearing. is there. In FIG. 5, the rotating shaft of the induction motor 4 is connected to a load 5 by a bearing via a bearing. Further, as indicated by arrows A and B, there are two types of leakage currents associated with high frequencies of several tens to several hundreds of KHZ, via the induction motor 4 and via the load 5.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、かよう
な構成では、インピーダンス７が大きいために矢印Ｂに
示す漏れ電流が大きくなり、これがために軸受け９に電
蝕が生じ、軸受けが破損することがあった。もちろんこ
の漏れ電流を減らすために、同相コア３が設けられてい
るが、完全にＢ系統に流れる漏れ電流を除去することが
出来ない現状である。本発明は上述した点に鑑みて創案
されたもので、その目的とするところは、Ｂ系統の漏れ
電流を電蝕が生じない電流まで減らすよう誘導電動機の
接地インピーダンスを小さくする電力変換装置を提供す
ることにある。However, in such a configuration, since the impedance 7 is large, the leakage current shown by the arrow B becomes large, which causes electric corrosion on the bearing 9 and damages the bearing. there were. Of course, in order to reduce the leakage current, the in-phase core 3 is provided, but it is impossible to completely eliminate the leakage current flowing through the B system. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a power converter that reduces the ground impedance of an induction motor so as to reduce the leakage current of the B system to a current that does not cause electrolytic corrosion. Is to do.
【０００４】[0004]
【課題を解決するための手段】つまり、その目的を達成
するための手段は、 １）請求項１において、インバータの出力信号を交流リ
アクトル又は同相コアの一次側に伝達し、二次側の出力
信号を誘導電動機に伝達することによって誘導電動機に
連結する負荷を駆動せしめる電力変換装置において、前
記インバータに大地と接続する接地線を設けると共に、
前記誘導電動機に大地と接続する接地線を設け、該誘導
電動機の接地線を前記交流リアクトル又は同相コアを介
して前記インバータの接地線に接続し、前記誘導電動機
の接地インピーダンスを小さくすることによって誘導電
動機の回転軸を支持する軸受けに流れる漏れ電流を小さ
くして軸受けの電蝕を軽減するよう構成したことを特徴
とする電力変換装置である。Means for achieving the object are as follows: 1) In claim 1, the output signal of the inverter is transmitted to the primary side of the AC reactor or the in-phase core, and the output of the secondary side is output. In a power converter for driving a load connected to the induction motor by transmitting a signal to the induction motor, the inverter is provided with a ground wire connected to the ground,
The induction motor is provided with a ground line connected to the ground, and the ground line of the induction motor is connected to the ground line of the inverter via the AC reactor or the in-phase core to reduce the ground impedance of the induction motor. A power converter characterized in that a leakage current flowing through a bearing supporting a rotating shaft of an electric motor is reduced to reduce electrolytic corrosion of the bearing.
【０００５】２）請求項２について、インバータの出力
信号を交流リアクトル又は同相コアの一次側に伝達し、
二次側の出力信号を誘導電動機に伝達することによって
誘導電動機に連結する負荷を駆動せしめる電力変換装置
において、前記インバータの入力側にノイズフィルタを
設けると共に大地と接続する接地線を設け、更に前記誘
導電動機に大地と接続する接地線を設け、該誘導電動機
の接地線を前記交流リアクトル又は同相コアを介して前
記ノイズフィルタの接地線に接続し、前記誘導電動機の
接地インピーダンスを小さくすることによって誘導電動
機の回転軸を支持する軸受けに流れる漏れ電流を小さく
して軸受けの電蝕を軽減するよう構成したことを特徴と
する電力変換装置である。[0005] 2) With regard to claim 2, transmitting the output signal of the inverter to the primary side of the AC reactor or the in-phase core,
In a power converter for transmitting a secondary-side output signal to an induction motor to drive a load connected to the induction motor, a noise filter is provided on the input side of the inverter, and a ground wire connected to the ground is provided. An induction motor is provided with a ground wire connected to the ground, and the ground wire of the induction motor is connected to the ground wire of the noise filter via the AC reactor or the in-phase core to reduce the ground impedance of the induction motor. A power converter characterized in that leakage current flowing through a bearing supporting a rotating shaft of an electric motor is reduced to reduce electrolytic corrosion of the bearing.
【０００６】３）請求項３において、前記ノイズフィル
タの代わりに、大地に接続する接地線を有するコンデン
サを設けた請求項２記載の電力変換装置である。ここ
で、前記交流リアクトル又は同相コアに巻回する巻線の
構成は、電源の３相に本発明の接地線を加えた４本を一
つに束ねて巻回したものである。また、請求項２記載の
コンデンサは３相に備えられている。以下、本発明の一
実施例を図面に基づいて詳述する。3) The power converter according to claim 2, wherein a capacitor having a ground line connected to the ground is provided in place of the noise filter. Here, the configuration of the winding wound around the AC reactor or the in-phase core is such that four windings obtained by adding the ground wire of the present invention to three phases of the power supply are bundled together and wound. The capacitor according to claim 2 is provided in three phases. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
【０００７】[0007]
【発明の実施の形態】図１は本発明の請求項１記載の一
実施例を示す説明図、図２は図１の同相コアの詳細図で
あり、図４と同符号のものは同じ構成を有す。図１にお
いて、図４と異なる点は、インバータ２に大地１０と接
続する接地線２１を設けたことと、誘導電動機４に接地
線４１を設け、この誘導電動機４の接地線４１を、図２
に示す同相コア３に巻回してインバータ２の接地線２１
に接続したことにある。このことによって、軸受け９を
流れていた漏れ電流は、同相コア３で小さくなり、更に
インバータ２の接地線２１を介して大地１０に放出され
る。FIG. 1 is an explanatory view showing an embodiment of the first aspect of the present invention. FIG. 2 is a detailed view of an in-phase core of FIG. Has. 1 differs from FIG. 4 in that a ground wire 21 for connecting to the ground 10 is provided in the inverter 2 and a ground wire 41 is provided in the induction motor 4, and the ground wire 41 of the induction motor 4 is
And wound on the in-phase core 3 shown in FIG.
Connected to. As a result, the leakage current flowing through the bearing 9 is reduced in the in-phase core 3 and further discharged to the ground 10 via the ground line 21 of the inverter 2.
【０００８】図３は本発明の請求項２記載の一実施例を
示す説明図であり、インバータ２の入力側にノイズフィ
ルタ１１を設けると共に大地１０と接続する接地線１１
１を設け、更に誘導電動機４に大地１０と接続する接地
線４１を設け、誘導電動機４の接地線４１を同相コア３
を介してノイズフィルタ１１の接地線１１１に接続し、
誘導電動機４の接地インピーダンスを小さくすることに
よって誘導電動機４の回転軸を支持する軸受け９に流れ
る漏れ電流を小さくして軸受け９の電蝕を軽減するよう
構成している。FIG. 3 is an explanatory view showing one embodiment of the second aspect of the present invention. A noise filter 11 is provided on the input side of the inverter 2 and a ground line 11 connected to the ground 10.
1 is further provided, and a ground wire 41 for connecting the ground 10 to the induction motor 4 is provided.
Is connected to the ground line 111 of the noise filter 11 through
By reducing the ground impedance of the induction motor 4, the leakage current flowing through the bearing 9 supporting the rotating shaft of the induction motor 4 is reduced to reduce the electric erosion of the bearing 9.
【０００９】図４は本発明の請求項３記載の説明図であ
り、ノイズフィルタ１１の代わりに、大地１０に接続す
る接地線１２１を有するコンデンサ１２を設けた構成で
ある。この場合も、請求項２の記載と同様にして漏れ電
流による軸受けの電蝕を軽減することが可能である。FIG. 4 is an explanatory view according to a third aspect of the present invention, in which a capacitor 12 having a ground line 121 connected to the ground 10 is provided in place of the noise filter 11. Also in this case, it is possible to reduce the electrolytic corrosion of the bearing due to the leakage current in the same manner as described in the second aspect.
【００１０】[0010]
【発明の効果】以上説明したように本発明によれば、高
周波による漏れ電流が同相コアを介して大地接地される
ので、誘導電動機に有する軸受けに漏れ電流が流れなく
なり、このために軸受けの電蝕がなくなり、実用上、極
めて有用性の高いものである。As described above, according to the present invention, since the leakage current due to the high frequency is grounded through the in-phase core, the leakage current does not flow through the bearing of the induction motor. It has no erosion and is extremely useful in practice.
【図１】本発明の請求項１記載の一実施例を示す説明図
である。FIG. 1 is an explanatory diagram showing one embodiment of the first aspect of the present invention.
【図２】図１の同相コアの詳細図である。FIG. 2 is a detailed view of the in-phase core of FIG. 1;
【図３】本発明の請求項２記載の一実施例を示す説明図
である。FIG. 3 is an explanatory view showing an embodiment according to claim 2 of the present invention.
【図４】本発明の請求項３記載の一実施例を示す説明図
である。FIG. 4 is an explanatory diagram showing an embodiment according to claim 3 of the present invention.
【図５】従来の一例を示す説明図である。FIG. 5 is an explanatory diagram showing an example of the related art.
１ 電源 ２ インバータ ３ 同相コア ４ 誘導電動機 ５ 負荷 ６，７，８ インピーダンス ９ 軸受け １０ 大地 １１ ノイズフィルタ １２ コンデンサ ２１，４１，１１１，１２１ 接地線 DESCRIPTION OF SYMBOLS 1 Power supply 2 Inverter 3 In-phase core 4 Induction motor 5 Load 6,7,8 Impedance 9 Bearing 10 Ground 11 Noise filter 12 Capacitor 21,41,111,121 Ground wire
Claims (3)
又は同相コアの一次側に伝達し、二次側の出力信号を誘
導電動機に伝達することによって誘導電動機に連結する
負荷を駆動せしめる電力変換装置において、前記インバ
ータに大地と接続する接地線を設けると共に、前記誘導
電動機に大地と接続する接地線を設け、該誘導電動機の
接地線を前記交流リアクトル又は同相コアを介して前記
インバータの接地線に接続し、前記誘導電動機の接地イ
ンピーダンスを小さくすることによって誘導電動機の回
転軸を支持する軸受けに流れる漏れ電流を小さくして軸
受けの電蝕を軽減するよう構成したことを特徴とする電
力変換装置。1. A power converter for transmitting an output signal of an inverter to a primary side of an AC reactor or an in-phase core and transmitting an output signal of a secondary side to the induction motor, thereby driving a load connected to the induction motor. The inverter is provided with a ground wire connected to the ground, and the induction motor is provided with a ground wire connected to the ground.The ground wire of the induction motor is connected to the ground wire of the inverter via the AC reactor or the in-phase core. A power converter, wherein the ground impedance of the induction motor is reduced to reduce leakage current flowing through a bearing supporting a rotating shaft of the induction motor, thereby reducing electrolytic corrosion of the bearing.
又は同相コアの一次側に伝達し、二次側の出力信号を誘
導電動機に伝達することによって誘導電動機に連結する
負荷を駆動せしめる電力変換装置において、前記インバ
ータの入力側にノイズフィルタを設けると共に大地と接
続する接地線を設け、更に前記誘導電動機に大地と接続
する接地線を設け、該誘導電動機の接地線を前記交流リ
アクトル又は同相コアを介して前記ノイズフィルタの接
地線に接続し、前記誘導電動機の接地インピーダンスを
小さくすることによって誘導電動機の回転軸を支持する
軸受けに流れる漏れ電流を小さくして軸受けの電蝕を軽
減するよう構成したことを特徴とする電力変換装置。2. A power converter for transmitting an output signal of an inverter to a primary side of an AC reactor or an in-phase core and transmitting an output signal of a secondary side to the induction motor, thereby driving a load connected to the induction motor. A noise filter is provided on the input side of the inverter and a ground wire connected to the ground is provided.Furthermore, a ground wire connected to the ground is provided to the induction motor, and the ground wire of the induction motor is connected to the ground through the AC reactor or the in-phase core. By connecting to the ground line of the noise filter and reducing the ground impedance of the induction motor, the leakage current flowing through the bearing supporting the rotating shaft of the induction motor is reduced to reduce the electrolytic corrosion of the bearing. Characteristic power converter.
接続する接地線を有するコンデンサを設けた請求項２記
載の電力変換装置。3. The power converter according to claim 2, wherein a capacitor having a ground line connected to the ground is provided instead of the noise filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11177677A JP2001016896A (en) | 1999-06-24 | 1999-06-24 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11177677A JP2001016896A (en) | 1999-06-24 | 1999-06-24 | Power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001016896A true JP2001016896A (en) | 2001-01-19 |
Family
ID=16035184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11177677A Pending JP2001016896A (en) | 1999-06-24 | 1999-06-24 | Power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001016896A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7446989B2 (en) | 2003-02-07 | 2008-11-04 | Ab Skf | Device for protection of the bearing of an electrical machine against damaging passage of current |
-
1999
- 1999-06-24 JP JP11177677A patent/JP2001016896A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7446989B2 (en) | 2003-02-07 | 2008-11-04 | Ab Skf | Device for protection of the bearing of an electrical machine against damaging passage of current |
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