JPH10135681A - Variable speed driving device - Google Patents
Variable speed driving deviceInfo
- Publication number
- JPH10135681A JPH10135681A JP8286300A JP28630096A JPH10135681A JP H10135681 A JPH10135681 A JP H10135681A JP 8286300 A JP8286300 A JP 8286300A JP 28630096 A JP28630096 A JP 28630096A JP H10135681 A JPH10135681 A JP H10135681A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- variable speed
- coaxial cable
- power converter
- frame
- 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.)
- Granted
Links
Landscapes
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、電力変換器に用
いられる自己消弧形デバイスのスイッチング動作に伴っ
て、該電力変換器の主回路導体とフレーム（接地端子）
との間に発生するコモンモードノイズが外部機器に悪影
響を与えるのを抑制することに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main circuit conductor and a frame (ground terminal) of a power converter in accordance with a switching operation of a self-extinguishing device used in the power converter.
The present invention relates to suppressing common mode noise generated between the external device and the external device from adversely affecting external devices.
【０００２】[0002]
【従来の技術】例えば、電力変換器としてのＰＷＭイン
バータを構成する順変換回路や逆変換回路に用いられる
自己消弧形デバイス（ＩＧＢＴ，ＭＯＳＦＥＴなど）の
スイッチング動作はパルス幅変調（ＰＷＭ）されたゲー
ト信号に基づいて行われ、このスイッチング動作により
コモンモードノイズがこの電力変換器の主回路導体とフ
レーム（接地端子）との間に発生することが知られてい
る。前記電力変換器と該電力変換器から給電される交流
電動機とからなる可変速駆動装置においては、上記コモ
ンモードノイズが外部機器に与える悪影響を抑制するべ
く、種々の方策が取られている。2. Description of the Related Art For example, the switching operation of a self-extinguishing device (IGBT, MOSFET, etc.) used in a forward conversion circuit or an inverse conversion circuit constituting a PWM inverter as a power converter is subjected to pulse width modulation (PWM). It is performed based on a gate signal, and it is known that the switching operation generates common mode noise between a main circuit conductor of the power converter and a frame (ground terminal). In a variable speed drive device including the power converter and an AC motor supplied with power from the power converter, various measures are taken to suppress the adverse effect of the common mode noise on external devices.
【０００３】図４は、この種の可変速駆動装置の従来例
を示す回路構成図であり、１は商用電源、２は図示しな
い負荷機器を駆動する可変速駆動装置を示し、可変速駆
動装置２は商用電源１の交流電力を直流電力に変換し、
この直流電力を所望の電圧，周波数の交流電力に変換す
るＰＷＭインバータ３と、コモンモードチョーク４と、
交流電動機５と、３本の接続ケーブル６とから構成され
ている。また、ＰＷＭインバータ３のフレーム及び交流
電動機５のフレームそれぞれは、感電等の防止対策など
から、接地線７，８により大地（アース）に接続されて
いる。FIG. 4 is a circuit diagram showing a conventional example of this type of variable speed driving device, wherein 1 is a commercial power supply, 2 is a variable speed driving device for driving a load device (not shown), 2 converts the AC power of the commercial power supply 1 into DC power,
A PWM inverter 3 for converting this DC power into AC power of a desired voltage and frequency, a common mode choke 4,
It comprises an AC motor 5 and three connection cables 6. Further, the frame of the PWM inverter 3 and the frame of the AC motor 5 are connected to the ground (earth) by grounding wires 7 and 8 for preventing electric shock and the like.
【０００４】図４において、ＰＷＭインバータ３の逆変
換回路３ａのスイッチング動作に伴って、逆変換回路３
ａの主回路導体とＰＷＭインバータ３のフレーム（接地
端子）との間にコンモードノイズが発生し、このコモン
モードノイズが逆変換回路３ａの主回路導体→ＰＷＭイ
ンバータ３の出力端子→コモンモードチョーク４→接続
ケーブル６→交流電動機５の入力端子→交流電動機５の
巻線とフレーム間との浮遊容量（ＣM ）→交流電動機５
のフレーム（接地端子）→接地線８→大地→接地線７→
ＰＷＭインバータ３のフレーム（接地端子）→逆変換回
路３ａの主回路導体とフレーム間との浮遊容量（ＣI ）
→逆変換回路３ａの主回路導体の経路でコモンモード電
流が流れる。[0004] In FIG. 4, the switching operation of the inverse conversion circuit 3 a of the PWM inverter 3 causes the inverse conversion circuit 3
a common mode noise is generated between the main circuit conductor of the inverter a and the frame (ground terminal) of the PWM inverter 3, and the common mode noise is generated by the main circuit conductor of the inverse conversion circuit 3 a → the output terminal of the PWM inverter 3 → the common mode choke. 4 → Connection cable 6 → Input terminal of AC motor 5 → Stray capacitance (C M ) between winding of AC motor 5 and frame → AC motor 5
Frame (ground terminal) → ground wire 8 → ground → ground wire 7 →
Frame (ground terminal) of the PWM inverter 3 → stray capacitance (C I ) between the main circuit conductor of the inverter circuit 3a and the frame
→ A common mode current flows through the path of the main circuit conductor of the inverse conversion circuit 3a.
【０００５】前記経路において、コモンモードチョーク
４は前記コモンモード電流を抑制する作用をし、該電流
により発生する磁束が外部機器に与える悪影響および該
電流が大地に流れることにより外部機器に与える悪影響
を防止している。In the above-mentioned path, the common mode choke 4 acts to suppress the common mode current, and to prevent the magnetic flux generated by the current from affecting the external equipment and the adverse effect of the current flowing to the ground from affecting the external equipment. Preventing.
【０００６】[0006]
【発明が解決しようとする課題】上記従来の可変速駆動
装置２においては、上述のコモンモード電流の抑制のた
めにコモンモードチョーク４を備えているが、このコモ
ンモードチョーク４がこの種の可変速駆動装置の小型
化，低価格化を妨げていた。この発明の目的は、上記問
題点を解決する可変速駆動装置を提供することにある。The above-mentioned conventional variable speed driving device 2 has a common mode choke 4 for suppressing the above-mentioned common mode current. This hindered downsizing and cost reduction of the variable speed drive. An object of the present invention is to provide a variable speed driving device that solves the above problems.
【０００７】[0007]
【課題を解決するための手段】この第１の発明は、自己
消弧形デバイスなどで構成される電力変換器と、該電力
変換器から所望の交流電力が供給されて、負荷機器を可
変速駆動する交流電動機とからなる可変速駆動装置にお
いて、前記電力変換器と交流電動機との間の接続線に同
軸ケーブルを使用する。According to a first aspect of the present invention, a power converter including a self-extinguishing device and the like, and a desired AC power supplied from the power converter to control a load device at a variable speed. In a variable-speed drive device including an AC motor to be driven, a coaxial cable is used for a connection line between the power converter and the AC motor.
【０００８】また第２の発明は前記第１の発明におい
て、前記同軸ケーブルを複数本備え、該それぞれの同軸
ケーブルの芯線は前記電力変換器の出力端子それぞれと
前記交流電動機の入力端子それぞれとの間を接続し、該
それぞれの同軸ケーブルの外部導体は前記電力変換器の
フレーム（接地端子）と前記交流電動機のフレーム（接
地端子）との間を接続する。According to a second aspect, in the first aspect, a plurality of the coaxial cables are provided, and a core wire of each of the coaxial cables is connected to an output terminal of the power converter and an input terminal of the AC motor. The outer conductor of each coaxial cable connects between the frame (ground terminal) of the power converter and the frame (ground terminal) of the AC motor.
【０００９】さらに第３の発明は前記第１の発明におい
て、前記同軸ケーブルは多芯の同軸ケーブルとし、該多
芯の同軸ケーブルのそれぞれの芯線は前記電力変換器の
出力端子それぞれと前記交流電動機の入力端子それぞれ
との間を接続し、該多芯の同軸ケーブルの外部導体は前
記電力変換器のフレーム（接地端子）と交流電動機のフ
レーム（接地端子）との間を接続する。In a third aspect based on the first aspect, the coaxial cable is a multi-core coaxial cable, and each core of the multi-core coaxial cable is connected to each of the output terminals of the power converter and the AC motor. And the outer conductor of the multi-core coaxial cable connects between the frame (ground terminal) of the power converter and the frame (ground terminal) of the AC motor.
【００１０】この発明によれば、前記電力変換器と交流
電動機との間の接続線に同軸ケーブルを使用することに
より、可変速駆動装置が備えていたコモンモードチョー
クを従来例に比べてより小形化または不要にすることが
できる。According to the present invention, by using a coaxial cable for the connection line between the power converter and the AC motor, the common mode choke provided in the variable speed driving device can be made smaller than the conventional example. Or unnecessary.
【００１１】[0011]
【発明の実施の形態】図１はこの発明の第１の実施例を
示す可変速駆動装置の回路構成図であり、図４に示した
従来の可変速駆動装置２と同一機能を有するものには同
一符号を付して、その説明を省略する。すなわち図１に
おいて、可変速駆動装置１０はＰＷＭインバータ３と、
交流電動機５と、３本の単芯の同軸ケーブル１１とから
構成され、それぞれの同軸ケーブル１１の芯線はＰＷＭ
インバータ３の出力端子それぞれと、交流電動機５の入
力端子それぞれとの間を接続し、それぞれの同軸ケーブ
ル１１の外部導体は、ＰＷＭインバータ３のフレーム
（接地端子）と交流電動機５のフレーム（接地端子）と
の間を接続している。FIG. 1 is a circuit diagram of a variable speed driving device according to a first embodiment of the present invention, which has the same function as the conventional variable speed driving device 2 shown in FIG. Are denoted by the same reference numerals, and description thereof is omitted. That is, in FIG. 1, the variable speed driving device 10 includes the PWM inverter 3 and
It comprises an AC motor 5 and three single-core coaxial cables 11, and the core of each coaxial cable 11 is PWM.
The output terminals of the inverter 3 are connected to the input terminals of the AC motor 5, respectively, and the outer conductors of the coaxial cables 11 are connected to the frame (ground terminal) of the PWM inverter 3 and the frame (ground terminal) of the AC motor 5, respectively. ).
【００１２】ここで同軸ケーブルの作用について、図２
に示す該ケーブルの等価回路を参照しつつ、以下に説明
をする。図２において、角周波数ωの電圧源ＶL により
同軸ケーブルの芯線に電流ＩLが流れる。この電流ＩL
は自己インダクタンスをＬL ，抵抗分をＲL とすると、
式（１）で表される。FIG. 2 shows the operation of the coaxial cable.
This will be described below with reference to an equivalent circuit of the cable shown in FIG. 2, current I L flows through the core wire of the coaxial cable by the voltage source V L of the angular frequency omega. This current I L
Is L L and the resistance is R L ,
It is represented by equation (1).
【００１３】[0013]
【数１】 ＩL ＝ＶL ／（ｊωＬL ＋ＲL ） …（１） また、同軸ケーブルの外部導体に誘起される電圧ＶS は
相互インダクタンスをＭとすると、式（２）で表され
る。I L = V L / (jωL L + R L ) (1) Further, the voltage V S induced in the outer conductor of the coaxial cable is expressed by the following equation (2), where M is the mutual inductance. .
【００１４】[0014]
【数２】 ＶS ＝ｊωＭ・ＩL …（２） 同軸構造であるため、Ｍ＝ＬL の関係が成り立つので、
同軸ケーブルの芯線に印加された電圧ＶL と外部導体に
誘起される電圧ＶS との関係は、式（３）となる。V S = jωM · I L (2) Because of the coaxial structure, the relationship of M = L L holds.
Relationship between the voltage V S induced voltage V L and the outer conductor is applied to the core wire of the coaxial cable, the formula (3).
【００１５】[0015]
【数３】 ＶS ／ＶL ＝ｊω／（ｊω＋ＲL ／ＬL ） …（３） 式（３）において、角周波数ωが十分に高い周波数の場
合（ω＞ＲL ／ＬL ）には、芯線に流れる電流ＩL と同
じ成分の電流を流す電圧ＶS が外部導体に誘起される。In [number 3] V S / V L = jω / (jω + R L / L L) ... (3) (3), if the angular frequency ω is sufficiently high frequency (ω> R L / L L ) is , the voltage V S to flow a current having the same component as the current I L flowing through the core is induced to the outer conductor.
【００１６】すなわち図１において、ＰＷＭインバータ
３から交流電動機５に給電する接続線を３本の同軸ケー
ブル１１とし、その外部導体の両端をそれぞれＰＷＭイ
ンバータ３のフレーム（接地端子）と交流電動機５のフ
レーム（接地端子）とに接続することにより、交流電動
機５の浮遊容量（ＣM ）を介して流れる前述のコモンモ
ード電流は、接地線７，８を介して流れるのではなく、
それぞれの同軸ケーブル１１の外部導体を介して流れる
こととなる。That is, in FIG. 1, three coaxial cables 11 are used as connection lines for supplying power from the PWM inverter 3 to the AC motor 5, and both ends of the outer conductor are connected to the frame (ground terminal) of the PWM inverter 3 and the AC motor 5. By connecting to the frame (ground terminal), the above-described common mode current flowing through the stray capacitance (C M ) of the AC motor 5 does not flow through the ground lines 7 and 8, but
It flows through the outer conductor of each coaxial cable 11.
【００１７】その結果、それぞれの前記コモンモード電
流により発生する磁束は互いに打ち消され、対応するそ
れぞれの該電流が大地に流れることによる外部機器への
悪影響を除去することができる。なお、図１に示したこ
の発明の第１の実施例において、それぞれの同軸ケーブ
ルの芯線と対応するそれぞれの外部導体の接続方法を入
れ換えても、目的とする作用は同じである。As a result, the magnetic fluxes generated by the respective common mode currents cancel each other out, and it is possible to eliminate the adverse effect on the external equipment due to the respective corresponding currents flowing to the ground. In the first embodiment of the present invention shown in FIG. 1, the intended operation is the same even if the method of connecting the outer conductor corresponding to the core wire of each coaxial cable is exchanged.
【００１８】図３はこの発明の第２の実施例を示す可変
速駆動装置の回路構成図であり、図４に示した従来の可
変速駆動装置２と同一機能を有するものには同一符号を
付して、その説明を省略する。すなわち図３において、
可変速駆動装置２０はＰＷＭインバータ３と、交流電動
機５と、３芯の同軸ケーブル２１とから構成され、同軸
ケーブル２１の芯線それぞれはＰＷＭインバータ３の出
力端子それぞれと、交流電動機５の入力端子それぞれと
の間を接続し、同軸ケーブル２１の外部導体は、ＰＷＭ
インバータ３のフレーム（接地端子）と交流電動機５の
フレーム（接地端子）との間を接続している。FIG. 3 is a circuit diagram of a variable-speed drive device according to a second embodiment of the present invention. The description is omitted. That is, in FIG.
The variable speed drive device 20 includes a PWM inverter 3, an AC motor 5, and a three-core coaxial cable 21. Each core wire of the coaxial cable 21 has an output terminal of the PWM inverter 3 and an input terminal of the AC motor 5. And the outer conductor of the coaxial cable 21 is PWM
The frame (ground terminal) of the inverter 3 and the frame (ground terminal) of the AC motor 5 are connected.
【００１９】図３に示した可変速駆動装置２０では、Ｐ
ＷＭインバータ３のそれぞれの出力端子から同軸ケーブ
ル２１の芯線に流れる前述のコモンモード電流の総和と
同じ周波数成分で逆方向の電流が、ＰＷＭインバータ３
のフレーム（接地端子）と交流電動機５のフレーム（接
地端子）との間に接続された同軸ケーブル２１の外部導
体に流れ、その作用は図２での説明と等価である。In the variable speed drive device 20 shown in FIG.
A current in the opposite direction with the same frequency component as the sum of the aforementioned common mode currents flowing from the respective output terminals of the WM inverter 3 to the core wire of the coaxial cable 21 is generated by the PWM inverter 3.
Flows through the outer conductor of the coaxial cable 21 connected between the frame (ground terminal) of the AC motor 5 and the frame (ground terminal) of the AC motor 5, and its operation is equivalent to that described in FIG.
【００２０】さらに、図１，図３に示したこの発明の実
施例において、図４に示したコモンモードチョーク４を
挿入し、コモンモードチョーク４と交流電動機５の間の
接続ケーブルを同軸ケーブル１１または同軸ケーブル２
１としても、目的とする作用は同じである。なお、図
１，図３に示したこの発明の実施例においては、３相の
ＰＷＭインバータの例で説明をしたが、単相のＰＷＭイ
ンバータでもよい。Further, in the embodiment of the present invention shown in FIGS. 1 and 3, the common mode choke 4 shown in FIG. 4 is inserted, and the connection cable between the common mode choke 4 and the AC motor 5 is changed to a coaxial cable 11. Or coaxial cable 2
Even if 1, the intended operation is the same. Although the embodiment of the present invention shown in FIGS. 1 and 3 has been described with reference to the example of the three-phase PWM inverter, a single-phase PWM inverter may be used.
【００２１】[0021]
【発明の効果】この発明によれば、前記電力変換器と交
流電動機との間の接続線に同軸ケーブルを使用すること
により、前述の如く可変速駆動装置が備えていたコモン
モードチョークを小形化または不要とすることができ、
この種の可変速駆動装置の小型化，低価格化が図れる。According to the present invention, by using a coaxial cable for the connection line between the power converter and the AC motor, the common mode choke provided in the variable speed drive as described above can be reduced in size. Or can be unnecessary
This type of variable speed drive can be reduced in size and cost.
【図１】この発明の第１の実施例を示す可変速駆動装置
の回路構成図FIG. 1 is a circuit configuration diagram of a variable-speed driving device according to a first embodiment of the present invention.
【図２】図１の動作説明図FIG. 2 is an operation explanatory diagram of FIG. 1;
【図３】この発明の第２の実施例を示す可変速駆動装置
の回路構成図FIG. 3 is a circuit configuration diagram of a variable speed drive device showing a second embodiment of the present invention.
【図４】従来例を示す可変速駆動装置の回路構成図FIG. 4 is a circuit configuration diagram of a variable speed drive device showing a conventional example.
１ 商用電源 ２ 可変速駆動装置 ３ ＰＷＭインバータ ３ａ 逆変換回路 ４ コモンモードチョーク ５ 交流電動機 ６ 接続ケーブル ７ 接地線 ８ 接地線 １０ 可変速駆動装置 １１ 同軸ケーブル ２０ 可変速駆動装置 ２１ 同軸ケーブル DESCRIPTION OF SYMBOLS 1 Commercial power supply 2 Variable speed drive 3 PWM inverter 3a Inverting circuit 4 Common mode choke 5 AC motor 6 Connection cable 7 Ground wire 8 Ground wire 10 Variable speed drive 11 Coaxial cable 20 Variable speed drive 21 Coaxial cable
Claims (3)
変換器と、該電力変換器から所望の交流電力が供給され
て、負荷機器を可変速駆動する交流電動機とからなる可
変速駆動装置において、 前記電力変換器と交流電動機との間の接続線に同軸ケー
ブルを使用することを特徴とする可変速駆動装置。1. A variable speed drive device comprising: a power converter constituted by a self-extinguishing device or the like; and an AC motor supplied with a desired AC power from the power converter to drive a load device at a variable speed. The variable speed drive device according to claim 1, wherein a coaxial cable is used for a connection line between the power converter and the AC motor.
て、 前記同軸ケーブルを複数本備え、 前記それぞれの同軸ケーブルの芯線は、前記電力変換器
の出力端子それぞれと前記交流電動機の入力端子それぞ
れとの間を接続し、 前記それぞれの同軸ケーブルの外部導体は、前記電力変
換器のフレーム（接地端子）と前記交流電動機のフレー
ム（接地端子）との間を接続することを特徴とする可変
速駆動装置。2. The variable speed drive device according to claim 1, wherein a plurality of said coaxial cables are provided, and a core wire of each of said coaxial cables has an output terminal of said power converter and an input terminal of said AC motor, respectively. And an outer conductor of each of the coaxial cables connects between a frame (ground terminal) of the power converter and a frame (ground terminal) of the AC motor. Drive.
て、 前記同軸ケーブルは多芯の同軸ケーブルとし、 前記多芯の同軸ケーブルのそれぞれの芯線は、前記電力
変換器の出力端子それぞれと前記交流電動機の入力端子
それぞれとの間を接続し、 前記多芯の同軸ケーブルの外部導体は、前記電力変換器
のフレーム（接地端子）と交流電動機のフレーム（接地
端子）との間を接続することを特徴とする可変速駆動装
置。3. The variable speed drive device according to claim 1, wherein the coaxial cable is a multi-core coaxial cable, and each core wire of the multi-core coaxial cable is connected to each of the output terminals of the power converter. Connecting between the input terminals of the AC motor; and connecting the outer conductor of the multi-core coaxial cable between the frame (ground terminal) of the power converter and the frame (ground terminal) of the AC motor. A variable speed drive device characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28630096A JP3702556B2 (en) | 1996-10-29 | 1996-10-29 | Variable speed drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28630096A JP3702556B2 (en) | 1996-10-29 | 1996-10-29 | Variable speed drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10135681A true JPH10135681A (en) | 1998-05-22 |
| JP3702556B2 JP3702556B2 (en) | 2005-10-05 |
Family
ID=17702601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28630096A Expired - Fee Related JP3702556B2 (en) | 1996-10-29 | 1996-10-29 | Variable speed drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3702556B2 (en) |
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| JP2003102180A (en) * | 2001-09-21 | 2003-04-04 | Hitachi Ltd | Module-type inverter for train |
| US7173395B2 (en) | 2003-02-12 | 2007-02-06 | Fanuc Ltd | Inverter unit grounding method and inverter unit |
| CN100440722C (en) * | 2004-11-12 | 2008-12-03 | 三菱电机株式会社 | Inverter system, AC ratory machine and electric inverter |
| JP2009027089A (en) * | 2007-07-23 | 2009-02-05 | Toyota Motor Corp | Shield structure |
| US7554780B2 (en) | 2004-11-12 | 2009-06-30 | Mitsubishi Denki Kabushiki Kaisha | Inverter system, AC rotating machine and electric power converter |
| EP2084810A2 (en) * | 2006-11-21 | 2009-08-05 | Azure Dynamics, Inc. | Rfi/emi filter for variable frequency motor drive system |
| JP2010087261A (en) * | 2008-09-30 | 2010-04-15 | Toyota Motor Corp | Motor drive unit for vehicle |
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| JP2020096853A (en) * | 2012-11-15 | 2020-06-25 | インテュイティブ サージカル オペレーションズ， インコーポレイテッド | Endoscopic system with low capacitance and/or electromagnetic shielding, and related method |
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| JP2003102180A (en) * | 2001-09-21 | 2003-04-04 | Hitachi Ltd | Module-type inverter for train |
| US7173395B2 (en) | 2003-02-12 | 2007-02-06 | Fanuc Ltd | Inverter unit grounding method and inverter unit |
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| JP2009027089A (en) * | 2007-07-23 | 2009-02-05 | Toyota Motor Corp | Shield structure |
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| JP2014140285A (en) * | 2012-12-18 | 2014-07-31 | Tosoh Corp | Stepping motor Drive unit |
| JP2014225965A (en) * | 2013-05-16 | 2014-12-04 | 三菱電機株式会社 | Power conversion device |
| JP5850356B1 (en) * | 2015-07-09 | 2016-02-03 | 株式会社オートネットワーク技術研究所 | Conductive path with noise filter |
| JP2017022516A (en) * | 2015-07-09 | 2017-01-26 | 株式会社オートネットワーク技術研究所 | Conducting path with noise filter |
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| US11502726B2 (en) | 2019-07-03 | 2022-11-15 | Alpha Technologies Services, Inc. | Coaxial cable power signal distribution systems and methods |
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| JP3702556B2 (en) | 2005-10-05 |
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