JP3701382B2

JP3701382B2 - Capacitor and capacitor connection method

Info

Publication number: JP3701382B2
Application number: JP11661796A
Authority: JP
Inventors: 隆木田; 保昭竹中
Original assignee: Toshiba Mitsubishi Electric Industrial Systems Corp
Current assignee: Toshiba Mitsubishi Electric Industrial Systems Corp
Priority date: 1996-05-10
Filing date: 1996-05-10
Publication date: 2005-09-28
Anticipated expiration: 2016-05-10
Also published as: JPH09306778A

Description

【０００１】
【発明の属する技術分野】
この発明は電動機の速度制御用の商用周波の交流を直流に変換し、平滑化した後に周波数の異なる交流に再変換する周波数変換装置の特に大容量のものに使用される平滑用のコンデンサおよびその接続方法に関するものである。
【０００２】
【従来の技術】
例えば、周波数を変換してインダクションモータの速度制御を行う周波数変換装置の例を図５に示す。図５は商用周波電源から変圧器により電圧を変え、順変換部にて直流に変換し、この直流を平滑にするために平滑用コンデンサが接続されており、平滑化された直流電圧が逆変換部で所定の電圧、周波数の交流電圧に変換されてインダクションモータに供給され、速度制御が行われる。この発明は、例えば図５に示すような特に大容量の周波数変換装置の平滑用のコンデンサの接続方法である。
【０００３】
周波数変換装置の容量が大きくなると、平滑用のコンデンサは大容量のものが必要となる。この場合、単器では必要容量が賄えないので複数個を並列に接続して所要の容量を確保する方法がとられる。このような場合の従来の周波数変換装置の平滑用のコンデンサの２レベル電圧形の周波数変換装置の接続方法の例として図６、図７に示したものがある。図６はコンデンサを並列に接続する場合の結線図であり、図７は図６の構成の接続導体の配置状態を示す図である。図において、１は複数の並列接続されるコンデンサであり、それぞれ上面に２個の端子１ａ、１ｂが設けられている。２は複数のコンデンサ１のそれぞれの一方の端子１ａを並列接続し、下記接続端子４Ｐに接続する接続導体、３は複数のコンデンサ１の他方の端子１ｂを並列接続し、下記接続端子４が配置された一端部の反対側から折り返し部３ａで折り返して接続端子４Ｐに接続する折り返し接続導体である。４はコンデンサ１が１列に整列された一端部に配置された接続端子であり、４ＰはＰ極側（正極側）の接続端子、４ＮはＮ極側（負極側）の接続端子である。
【０００４】
周波数変換装置の順変換部はサイリスタによって商用周波電圧を整流し、波形を裁断して電圧を調整するものであり、サイリスタの電流裁断時間は非常に短く、急峻な裁断波となり高い周波数成分を含む電圧波形であり、コンデンサを並列接続した接続導体のインダクタンスによる電圧降下が大きく、各コンデンサの接続導体の長さが異なると電圧降下に差できる。各コンデンサに加わる電圧に差があると寿命に差ができる問題点があるので、各コンデンサを並列接続する接続導体は図６、図７に示すように一方の接続導体を折り返し接続し、各コンデンサに接続される接続導体の長さを同じにしてそれぞれのコンデンサに加わる電圧がほぼ同じになるようにしているものである。
【０００５】
図８、図９は３レベル電圧形の周波数変換装置に使用されるコンデンサの結線図及び結線状態図である。図において、５は２列に整列されたＰ極側のコンデンサ１のそれぞれの一方の列の端子１ａを並列接続し、下記接続端子１０が配置された反対側から折り返し部５ａで折り返して接続端子１０Ｐに接続する接続導体、６はＰ極側のコンデンサ１群の他方の端子１ｂを並列接続し接続端子１０ＣＰに接続する接続導体、７はＮ極側のコンデンサ１群のそれぞれの一方の端子１ａを並列接続し、下記接続端子１０が配置された反対側から折り返し部７ａで折り返して接続端子１０Ｎに接続する接続導体、８はＮ極側のコンデンサ１群の他方の端子１ｂを並列接続し接続端子１０ＣＮに接続する接続導体である。１０はコンデンサ１群がＰ極側用、負極側用の２列に整列された一端部に配置された接続端子であり、１０ＰはＰ極側（正極側）の接続端子、１０ＣＰはＰ極側の中性点側の接続端子、１０ＮはＮ極側（負極側）の接続端子、１０ＣＮはＮ極側の中性点側の接続端子である。
【０００６】
この中性点側に接続端子をもつ３レベル電圧形においては、回路構成としては２レベル電圧形と同じ構成を２組組み合わせた構成となっている。コンデンサ１群の並列接続する接続導体はそれぞれの組毎にいずれか一方を図６、図７と同様に、接続導体を折り返し接続導体とすることで各コンデンサに加わる電圧をほぼ同じにすることができる。
【０００７】
【発明が解決しようとする課題】
大容量の周波数変換装置の平滑用のコンデンサとして、必要な容量は大きく、その容量を確保するためには多数のコンデンサが並列接続されて構成される。大容量のコンデンサは、寸法が大きく接続導体も長くなり、接続導体回路のインダクタンスが大きくなる。また、大容量になればコンデンサに流れる電流も高周波成分を多く含む高い電圧となるので、接続導体部分に生じる電圧降下も大きくなり、端子、接続導体部分の絶縁が脅かされる問題点があった。
【０００８】
この発明は、上記問題点を解決するためになされたものであり、接続導体部分に発生する異常電圧を抑制して、絶縁が脅かされないコンデンサの接続方法を得ることを目的とする。
【０００９】
【課題を解決するための手段】
この発明の請求項１に係るコンデンサの接続方法は、上方から見て矩形の容器上面の矩形の短辺側側部寄りに第１の端子、中央部に第２の端子を配置した複数のコンデンサが上方から見て矩形容器の長辺側が対向する方向で第１の端子の配置方向の左側、右側の交互になるように一列に配置し、第１の端子を左側、右側ごとにそれぞれ並列接続し、それぞれ接続端子が配置された一端部の反対側から折り返して折り返し接続導体で接続端子にそれぞれ接続し、中央部に配置された各第２の端子は、両側部に配置された第１の端子に対応する端子をそれぞれ接続導体で接続端子にそれぞれ並列接続し、接続導体および折り返し接続導体は絶縁部材を間挿し、それぞれ列ごとに近接して配置したものである。
【００１０】
この発明の請求項２に係るコンデンサの接続方法は、上方から見て矩形の容器上面の矩形の短辺側側部寄りに第１の端子、中央部に第２の端子を配置した複数のコンデンサが上方から見て矩形容器の長辺側が対向する方向で第１の端子の配置方向の左側、右側の交互になるように一列に配置し、第１の端子を左側、右側ごとにそれぞれ並列接続し、それぞれ接続端子が配置された一端部の反対側から折り返して折り返し接続導体で接続端子にそれぞれ接続し、中央部に配置された各第２の端子は一本の接続導体で並列接続し、一端部に配置された接続端子に接続し、第１の端子を接続する折り返し接続導体は、中央部に配置された接続導体の両側にそれぞれ絶縁部材を間挿して、近接して配置したものである。
【００１１】
【発明の実施の形態】
実施の形態１．
図１、図２、図３に実施の形態１の構成を示す。この構成は、３レベル電圧形周波数変換装置に使用する平滑用のコンデンサを一列に配置して、接続導体のインダクタンスが小さくなるようにしたものである。図１はコンデンサと接続導体の関係を示す説明図である。図２は図１の構成を具体的に実製品に構成した例を示す平面図である。図３は図２の側面図である。図において、３１はコンデンサであり、容器が上方から見て矩形の容器上面の矩形の短辺側側部寄りに第１の端子３１ａを配置し、第２の端子３１ｂを容器の中央部に配置したものであり、この複数のコンデンサ３１が第１の端子が１台おきに配置方向の左側、右側の交互になるように１列に配置してコンデンサ群が構成されている。３４はコンデンサ３１が一列に配置された端部に設けられた接続端子、３５はコンデンサ群の第１の端子３１ａを並列接続する折り返し接続導体、３６はコンデンサ３１の容器の中央部に配置された第２の端子３１ｂの第１の端子３１ａに対応する端子を並列接続する接続導体、３３ａは折り返し接続導体３５の折り返し部と接続導体３６の間に間挿された絶縁部材、３３ｂは折り返し接続導体３５の折り返し部に間挿される絶縁部材である。
【００１２】
コンデンサ３１は側部に配置された第１の端子３１ａが配置方向の左側、右側の交互になるように１列に配置して、左側、右側のそれぞれの第１の端子をそれぞれ折り返し接続導体３５で並列接続し、一方をＰ極側の接続端子、他の一方をＮ極側の接続端子３４Ｎに接続し、中心側の端子はそれぞれの第１の端子に対応して接続導体３６により、それぞれで並列接続して、端部で共通にして接続端子３４Ｃに接続している。コンデンサ３１の第１の端子３１ａに対応して、左側、右側それぞれの側部ごとに、折り返し接続導体３５と接続導体３６の間に絶縁部材３３ａ、折り返し接続導体３５の折り返し部の間に絶縁部材３３ｂをそれぞれ間挿し、近接して配置している。この構成を実際のコンデンサで形成すると、図２の平面図、図３の側面図のようになる。
【００１３】
このように構成すると、配置方向の左側、右側それぞれの側部において、コンデンサ３１に流れ込む充電電流は、折り返し接続導体３５、接続導体３６に流れてそれぞれの接続導体３５、３６に流れる電流による磁界は互いに反対方向であるので相殺され周囲磁界はほとんど発生せず、接続導体としてのインダクタンスは非常に小さい値となる。したがって、高い周波数成分を多く含む電圧が印加されても接続導体部分の電圧降下による異常電圧はあまり大きくはならず、端子、接続導体の絶縁が脅かされる心配がなくなる。
【００１４】
この構成では、コンデンサ３１の端子を容器上面の側部に第１の端子３１ａと中心部に第２の端子３１ｂを配置したので、３レベル電圧形周波数変換装置の平滑用のコンデンサであっても１列に配置して構成でき、また、接続導体のインダクタンスを小さくする接続導体の配置はコンデンサの上面にＰ極側、Ｎ極側の双方が配置でき、接続端子３４も小さいスペースで配置できるものであり、据付スペースの形の自由度、据付スペースの縮小を可能にする効果も奏する。
【００１５】
実施の形態２．
実施の形態２の構成を図４に示す。この実施の形態２は、実施の形態１のコンデンサの中心部に配置された端子の並列接続をＰ極側、Ｎ極側を共通にしたものである。コンデンサ３１の端子の位置は実施の形態１と同じように、容器が上方から見て矩形の容器上面の矩形の短辺側側部寄りに第１の端子３１ａを配置し、第２の端子３１ｂを容器の中央部に配置したものを使用するものである。図において、４１は折り返し接続導体、４２は中心部端子を共通で並列接続する接続導体、４４はコンデンサの列の端部に配置した接続端子である。コンデンサ３１の第１の端子３１ａの接続は実施の形態１と同様に折り返し接続導体４１により、それぞれの側ごとに並列接続し、接続端子が配置された側の反対側から折り返して接続端子４４のそれぞれの端子４４Ｐ、４４Ｎに接続しており、コンデンサ容器中心部の第２の端子３１ｂは、第１の端子３１ａに対応する第２の端子３１ｂ共通にして１本の接続導体４２で接続し、接続端子４４Ｃに接続した構成である。４３ａは接続導体４２の側面と折り返し接続導体４１の間に間挿する絶縁部材、４３ｂは折り返し接続導体４１の折り返し部４１ａの部分に間挿する絶縁部材である。
【００１６】
折り返し接続導体４１および接続導体４２は、コンデンサ３１の容器上面の中心に配置された１本の接続導体４２の両側面に絶縁部材４３ａを間挿して折り返し接続導体４１を近接して配置しており、折り返し接続導体４１、および接続導体４２に流れるコンデンサの充電電流はそれぞれ反対方向であり、周囲に生じる磁界は相殺されるので、この構成においても周囲磁界はほとんど発生せず、接続導体のインダクタンスは非常に小さな値である。したがって、高い周波数成分を多く含む電圧が印加されても接続導体部分の電圧降下による異常電圧はあまり大きくはならず、端子、接続導体の絶縁が脅かされる心配がなくなる。
【００１７】
この構成では、折り返し接続導体４１および接続導体４２を近接して配置したので、接続導体のインダクタンスが非常に小さくなる効果に加えて、コンデンサ３１の容器上面の中心部に配置された端子３１ｂの接続導体の使用量が少なくなる効果もある。
【００１８】
【発明の効果】
この発明の請求項１に係るコンデンサの接続方法は、コンデンサは容器上面の矩形の短辺側寄りの第１の端子と中央部に第２の端子を配置し、複数のコンデンサの第１の端子の位置が左側、右側の交互になるように配置した配置方向の左側、右側それぞれで第１の各端子を並列接続し、それぞれ接続端子が配置された反対側から折り返して折り返し接続導体で接続端子にそれぞれ接続し、中央部に配置された各端子は両側部に配置された端子に対応する端子をそれぞれ接続導体でそれぞれ並列接続して接続端子に接続し、接続導体および折り返し接続導体は絶縁部材を間挿し、それぞれ列ごとに近接して配置したので、各コンデンサの端子電圧はほぼ等しくなり、３レベル電圧形の平滑用のコンデンサであっても１列に配置することができ、接続導体のインダクタンスは小さくなり、接続導体はコンデンサの上面に配置できるものであり、据付スペースの縮小を可能にし、配置の自由度も大きくなる。
【００１９】
この発明の請求項２に係るコンデンサの接続方法は、コンデンサは容器上面の矩形の短辺寄りに第１の端子、中央部に第２の端子を配置し、複数のコンデンサは第１の端子の位置が左側、右右側の交互になるように配置して、列の両側部ごとに各端子を接続導体で並列接続し、それぞれ接続端子が配置された反対側から折り返して折り返し接続導体で接続端子にそれぞれ接続し、中央部の第２の端子は１本の接続導体で並列接続し、容器の側部寄りに配置された折り返し接続導体は中央部に配置された接続導体に絶縁部材を間挿して、それぞれ近接して配置したので、各コンデンサの端子電圧はほぼ等しくなり、３レベル電圧形の平滑用のコンデンサであっても１列に配置することができ、接続導体のインダクタンスは小さくなり、接続導体はコンデンサの上面に配置でき、中央部の接続導体は１本であり材料費が節約できるとともに、据付スペースの縮小を可能にし、配置の自由度も大きくなる効果に加えて、コンデンサの容器上面の中心部に配置された端子の接続導体の使用量が少なくなる効果もある。
【図面の簡単な説明】
【図１】この発明による実施の形態１．のコンデンサの端子位置を一方に寄せた場合の接続方法の構成を示す説明図である。
【図２】図１の説明図の構成を実製品に適用した場合の構成を示す平面図である。
【図３】図２の側面図である。
【図４】この発明による実施の形態２のコンデンサの中央の接続導体を１本とした場合の接続方法の構成を示す説明図である。
【図５】周波数変換装置の構成例を示す配線図である。
【図６】従来の２レベル電圧形の平滑用のコンデンサの結線図である。
【図７】従来の２レベル電圧形の平滑用のコンデンサの接続方法の構成を示す説明図である。
【図８】従来の３レベル電圧形の平滑用のコンデンサの結線図である。
【図９】従来の３レベル電圧形の平滑用のコンデンサの接続方法の構成を示す説明図である。
【符号の説明】
３１コンデンサ、３３絶縁部材、３４接続端子、３５折り返し接続導体、
３６接続導体、４１折り返し接続導体、４２接続導体、４３絶縁部材、
４４接続端子。[0001]
BACKGROUND OF THE INVENTION
This invention converts a commercial frequency alternating current for controlling the speed of an electric motor into a direct current, smoothes it, and then reconverts it into an alternating current having a different frequency. It relates to a connection method.
[0002]
[Prior art]
For example, FIG. 5 shows an example of a frequency converter that converts the frequency to control the speed of the induction motor. In FIG. 5, the voltage is changed by a transformer from a commercial frequency power source, converted to DC by a forward conversion unit, a smoothing capacitor is connected to smooth the DC, and the smoothed DC voltage is inversely converted. Is converted into an AC voltage having a predetermined voltage and frequency and supplied to the induction motor to perform speed control. The present invention is, for example, a particular method of connecting a smoothing capacitor of the frequency converter of large capacity as shown in FIG.
[0003]
As the capacity of the frequency converter increases, a smoothing capacitor is required. In this case, since the required capacity cannot be covered by a single unit, a method of securing a required capacity by connecting a plurality of units in parallel is employed. 6 and 7 show examples of connection methods of the two-level voltage source frequency converter of the smoothing capacitor of the conventional frequency converter in such a case. Figure 6 is a connection diagram when connecting a capacitor in parallel, FIG. 7 is a diagram showing the arrangement of the connecting conductors of the configuration of FIG. In the figure, reference numeral 1 denotes a plurality of capacitors connected in parallel, and two terminals 1a and 1b are provided on the upper surface, respectively. 2 is a connection conductor for connecting one terminal 1a of each of the plurality of capacitors 1 in parallel and connected to the following connection terminal 4P, 3 is a connection for connecting the other terminal 1b of the plurality of capacitors 1 in parallel, and the following connection terminal 4 is arranged. This is a folded connection conductor that is folded back from the opposite side of the one end by the folded portion 3a and connected to the connection terminal 4P. Reference numeral 4 denotes a connection terminal arranged at one end where the capacitors 1 are arranged in a row, 4P denotes a connection terminal on the P pole side (positive side), and 4N denotes a connection terminal on the N pole side (negative electrode side).
[0004]
The forward converter of the frequency converter rectifies the commercial frequency voltage with a thyristor and cuts the waveform to adjust the voltage. The current cutting time of the thyristor is very short, resulting in a sharp cutting wave and high frequency components. The voltage waveform has a large voltage drop due to the inductance of the connection conductors in which the capacitors are connected in parallel. If the lengths of the connection conductors of the capacitors are different, the voltage drop can be different. The difference in the life of the voltage applied to each capacitor is a difference can have problems, connection conductors connected in parallel each capacitor 6, connected folded one connection conductor 7, each capacitor The lengths of the connecting conductors connected to each other are made the same so that the voltages applied to the respective capacitors are almost the same.
[0005]
8 and 9 are a connection diagram and a connection state diagram of capacitors used in the three-level voltage type frequency converter. In the figure, reference numeral 5 designates a terminal 1a in each column of the P pole side capacitors 1 arranged in two rows in parallel, and is folded back at the folded portion 5a from the opposite side where the following connection terminals 10 are arranged. 10 is a connection conductor connected to 10P, 6 is a connection conductor connecting the other terminal 1b of the capacitor group on the P-pole side in parallel and connecting to the connection terminal 10CP, and 7 is one terminal 1a of each capacitor group on the N-pole side. Are connected in parallel, connected from the opposite side where the following connection terminal 10 is disposed at the folded portion 7a and connected to the connection terminal 10N, and 8 is connected by connecting the other terminal 1b of the capacitor group 1 on the N pole side in parallel. A connection conductor connected to the terminal 10CN. Reference numeral 10 denotes a connection terminal arranged at one end of a group of capacitors arranged in two rows for the P pole side and the negative side, 10P is a connection terminal on the P pole side (positive side), and 10CP is the P pole side 10N is a connection terminal on the N pole side (negative electrode side), and 10CN is a connection terminal on the neutral point side of the N pole side.
[0006]
The three-level voltage type having a connection terminal on the neutral point side has a circuit configuration in which two sets of the same configuration as the two-level voltage type are combined. As shown in FIGS. 6 and 7 , one of the connection conductors connected in parallel of the group of capacitors can be made substantially the same voltage applied to each capacitor by turning the connection conductor back into the connection conductor as in FIGS. it can.
[0007]
[Problems to be solved by the invention]
As a smoothing capacitor for a large-capacity frequency converter, a large capacity is required, and a large number of capacitors are connected in parallel to secure the capacity. A large-capacity capacitor has a large size and a long connection conductor, resulting in an increase in inductance of the connection conductor circuit. Further, if the capacity is increased, the current flowing through the capacitor also becomes a high voltage containing a lot of high frequency components, so that the voltage drop generated in the connection conductor portion also increases, and there is a problem that the insulation of the terminal and the connection conductor portion is threatened.
[0008]
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a capacitor connection method in which an abnormal voltage generated in a connection conductor portion is suppressed and insulation is not threatened.
[0009]
[Means for Solving the Problems]
Connection of a capacitor according to claim 1 of the present invention, a rectangular shorter side on the side nearer the first rectangular container top as viewed from above the terminal, a plurality of the second terminal is disposed in a central portion left side of the arrangement direction of the first terminal in a direction long side of the rectangular container is opposed capacitor as viewed from above, it is arranged in a row so as to alternate the right side, the first terminal left, each right connected in parallel, respectively, by folding back the opposite end portion of each connecting terminal is disposed and connected to the connection terminal by the return connection conductor, the second terminal arranged in the center portion is arranged on both sides the terminal corresponding to the first terminal connected in parallel respectively to the connection terminals respectively connecting conductor, connecting conductors and fold connection conductor is obtained by arranged close to each inserted between the insulating member, respectively columns.
[0010]
Connection of a capacitor according to claim 2 of the present invention, a rectangular shorter side on the side nearer the first rectangular container top as viewed from above the terminal, a plurality of the second terminal is disposed in a central portion left side of the arrangement direction of the first terminal in a direction long side of the rectangular container is opposed capacitor as viewed from above, it is arranged in a row so as to alternate the right side, the first terminal left, each right Connected in parallel, folded from the opposite side of one end where each connection terminal is placed, connected to the connection terminal with a folded connection conductor, and each second terminal placed in the center is parallel with a single connection conductor The folded connection conductors that connect and connect to the connection terminals arranged at one end and connect the first terminal are arranged close to each other by interposing insulating members on both sides of the connection conductor arranged at the center part. It is a thing.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1, 2 and 3 show the configuration of the first embodiment. In this configuration, smoothing capacitors used in the three-level voltage source frequency converter are arranged in a row so that the inductance of the connection conductor is reduced. FIG. 1 is an explanatory diagram showing the relationship between a capacitor and a connection conductor. FIG. 2 is a plan view showing an example in which the configuration of FIG. 1 is specifically configured as an actual product. FIG. 3 is a side view of FIG. In the figure, 31 is a capacitor, the first terminal 31a is disposed near the rectangular short side of the upper surface of the container as viewed from above , and the second terminal 31b is disposed in the center of the container. are those were, the plurality of capacitors 31 are left side of the arrangement direction the first terminal every one, capacitor group arranged in a row so as to alternate the right side is configured. 34 is a connection terminal provided at the end where the capacitors 31 are arranged in a row, 35 is a folded connection conductor for connecting the first terminals 31a of the capacitor group in parallel, and 36 is arranged in the center of the container of the capacitor 31. the first parallel connection connecting conductor terminals corresponding to the terminals 31a, 33a are interposer is an insulating member between the connection and the folded portion of the folded connecting conductor 35 conductor 36 of the second terminal 31b, 33b is folded connecting conductor The insulating member is inserted into the 35 folded portion.
[0012]
Capacitor 31 is left side of the first terminal 31a is arranged direction located on the sides, and arranged in a row so as to alternate the right side, left side, respectively folded connecting each of the first terminal of the right The conductors 35 are connected in parallel, one is connected to the P pole side connection terminal, the other is connected to the N pole side connection terminal 34N, and the center side terminal is connected to the first terminal by the connection conductor 36. These are connected in parallel to each other, and are connected to the connection terminal 34C in common at the ends. Corresponding to the first terminal 31 a of the capacitor 31, an insulating member 33 a is provided between the folded connection conductor 35 and the connection conductor 36 and an insulating member is disposed between the folded portions of the folded connection conductor 35 for each of the left and right sides. 33b is inserted and arranged close to each other. When this structure is formed by an actual capacitor, a plan view of FIG. 2 and a side view of FIG. 3 are obtained.
[0013]
With this configuration, the charging current flowing into the capacitor 31 on the left and right sides in the arrangement direction flows into the folded connection conductor 35 and the connection conductor 36, and the magnetic field due to the current flowing through the connection conductors 35 and 36 is ambient magnetic field are canceled out because each other is in the opposite direction hardly occurs, the inductance of the connection conductor is extremely small value. Therefore, even when a voltage containing a large amount of high frequency components is applied, the abnormal voltage due to the voltage drop of the connecting conductor portion does not become so large, and there is no fear that the insulation of the terminal and the connecting conductor will be threatened.
[0014]
In this configuration, since the first terminal 31a and the second terminal 31b are arranged on the side of the upper surface of the container, the capacitor 31 has a smoothing capacitor for the three-level voltage source frequency converter. Can be configured in a single row, and the connection conductors that reduce the inductance of the connection conductors can be arranged on both the P pole side and the N pole side on the upper surface of the capacitor, and the connection terminals 34 can also be placed in a small space Thus, there are also the effects that the degree of freedom of the shape of the installation space and the reduction of the installation space can be achieved.
[0015]
Embodiment 2. FIG.
The configuration of the second embodiment is shown in FIG. In the second embodiment, the P pole side and the N pole side are commonly used for the parallel connection of the terminals arranged at the center of the capacitor of the first embodiment. The position of the terminal of the capacitor 31 is the same as in the first embodiment. The first terminal 31a is disposed near the rectangular short side of the upper surface of the rectangular container as viewed from above, and the second terminal 31b. Is used at the center of the container . In the figure, reference numeral 41 is a folded connection conductor, 42 is a connection conductor for connecting the central terminals in common, and 44 is a connection terminal arranged at the end of the capacitor row. The first terminal 31a of the capacitor 31 is connected in parallel on each side by the folded connection conductor 41 as in the first embodiment, and is folded back from the side opposite to the side where the connection terminal is arranged. Each of the terminals 44P and 44N is connected, and the second terminal 31b at the center of the capacitor container is connected by a single connection conductor 42 in common with the second terminal 31b corresponding to the first terminal 31a. The configuration is connected to the connection terminal 44C. 43 a is an insulating member that is inserted between the side surface of the connection conductor 42 and the folded connection conductor 41, and 43 b is an insulating member that is inserted into the folded portion 41 a of the folded connection conductor 41.
[0016]
The folded connection conductor 41 and the connection conductor 42 are arranged so that the folded connection conductor 41 is close to each other by interposing an insulating member 43a between both side surfaces of the single connection conductor 42 disposed at the center of the upper surface of the container of the capacitor 31. Since the charging currents of the capacitors flowing in the folded connection conductor 41 and the connection conductor 42 are in opposite directions and the magnetic fields generated in the surroundings cancel each other, even in this configuration, almost no ambient magnetic field is generated, and the inductance of the connection conductor is Very small value. Therefore, even when a voltage containing a large amount of high frequency components is applied, the abnormal voltage due to the voltage drop of the connecting conductor portion does not become so large, and there is no fear that the insulation of the terminal and the connecting conductor will be threatened.
[0017]
In this configuration, since the folded connection conductor 41 and the connection conductor 42 are arranged close to each other, in addition to the effect that the inductance of the connection conductor becomes very small, the connection of the terminal 31b arranged at the center of the container upper surface of the capacitor 31 is achieved. There is also an effect of reducing the amount of conductor used.
[0018]
【The invention's effect】
According to a first aspect of the present invention, there is provided a capacitor connecting method, wherein the capacitor has a first terminal near the rectangular short side of the upper surface of the container and a second terminal in the center , and the first terminals of the plurality of capacitors . position is the left side, right side of the made such an arrangement the arrangement direction of the left side alternately connected in parallel first terminals of each right, folding connecting conductor is folded back from the other side of connecting terminals are disposed respectively The terminals arranged in the center are connected in parallel to the terminals corresponding to the terminals arranged on both sides by connecting conductors, respectively, and connected to the connecting terminals. Since the insulating members are inserted and arranged close to each other, the terminal voltages of the capacitors are almost equal, and even a three-level voltage type smoothing capacitor can be arranged in one row, Inductance of connection conductor decreases, the connection conductors are those that can be placed on the upper surface of the capacitor, allowing a reduction in installation space, the greater flexibility of the arrangement.
[0019]
Connection of a capacitor according to claim 2 of the present invention, the capacitor first terminal, a second terminal to a central portion disposed in the short side near the rectangular container top, the plurality of capacitors of the first terminal position the left side, and arranged so as to alternate the right right, parallel connect each terminal connection conductors for each opposite sides of the column, connected by the return connection conductor is folded back from the other side of connecting terminals are disposed respectively Connected to each terminal, the second terminal in the center is connected in parallel with one connection conductor, and the folded connection conductor arranged near the side of the container has an insulating member interposed between the connection conductors arranged in the center Since the capacitors are arranged close to each other, the terminal voltages of the capacitors are almost equal, and even a three-level voltage type smoothing capacitor can be arranged in one row, and the inductance of the connecting conductor is reduced. , Connecting conductor It can be placed on the top surface of the capacitor, and there is only one connecting conductor in the center. This saves material costs, reduces the installation space, and increases the degree of freedom of placement. There is also an effect that the amount of connection conductors of the terminals arranged in the portion is reduced.
[Brief description of the drawings]
FIG. 1 shows a first embodiment of the present invention. It is explanatory drawing which shows the structure of the connection method when the terminal position of the capacitor | condenser is moved to one side.
FIG. 2 is a plan view showing a configuration when the configuration shown in FIG. 1 is applied to an actual product.
FIG. 3 is a side view of FIG. 2;
FIG. 4 is an explanatory diagram showing a configuration of a connection method when a single connection conductor is provided in the center of the capacitor according to the second embodiment of the present invention.
FIG. 5 is a wiring diagram showing a configuration example of a frequency conversion device.
FIG. 6 is a connection diagram of a conventional two-level voltage type smoothing capacitor.
FIG. 7 is an explanatory diagram showing a configuration of a conventional connecting method of a smoothing capacitor of a two-level voltage type.
FIG. 8 is a connection diagram of a conventional three-level voltage type smoothing capacitor.
FIG. 9 is an explanatory diagram showing a configuration of a conventional method of connecting a smoothing capacitor of a three-level voltage type.
[Explanation of symbols]
31 capacitor, 33 insulating member, 34 connection terminal, 35 folded connection conductor,
36 connection conductors, 41 folded connection conductors, 42 connection conductors, 43 insulating members,
44 Connection terminal.

Claims

First terminal to the short side side side of the rectangular container top rectangular when viewed from above, a plurality of capacitors second terminals are arranged at the center of the container top, the length of the rectangular container when viewed from above the in the direction of side faces the first arrangement direction left side of the terminal, the right side alternately arranged in a row so that the capacitor groups, multiple connections to one end of the arrangement direction of the capacitor group terminal The first terminal of the capacitor group is connected in parallel on the left side and the right side, and is folded back from the opposite side of the one end where the connection terminal of the capacitor group is disposed and connected to the connection terminal. The connection conductor includes a connection conductor that connects the second terminals corresponding to the first terminals alternately arranged on the left side and the right side in the arrangement direction on the left side and the right side, respectively. Connection Body and the connecting conductors are inserted between the insulating member between the opposite sides, a connection method of a capacitor, characterized in that the closely spaced.

First terminal to the short side side side of the rectangular container top rectangular when viewed from above, a plurality of capacitors second terminals are arranged at the center of the container top, the length of the rectangular container when viewed from above the in the direction of side faces the first arrangement direction left side of the terminal, the right side alternately arranged in a row so that the capacitor groups, multiple connections to one end of the arrangement direction of the capacitor group terminal The first terminal of the capacitor group is connected in parallel on the left side and the right side, and is folded back from the opposite side of the one end where the connection terminal of the capacitor group is disposed and connected to the connection terminal. The connection conductor is composed of a connection conductor connected in parallel to the second terminal disposed at the center of the upper surface of the container and connected to the connection terminal. The connection conductor is disposed on the upper surface of the center of the capacitor row and is folded back. Connecting conductor is Serial interdigitated with an insulating member between the opposite sides on either side of the arranged connecting conductor to the central portion, the connection method of the capacitor, characterized in that the closely spaced.