JPH0448154Y2 - - Google Patents
Info
- Publication number
- JPH0448154Y2 JPH0448154Y2 JP2087886U JP2087886U JPH0448154Y2 JP H0448154 Y2 JPH0448154 Y2 JP H0448154Y2 JP 2087886 U JP2087886 U JP 2087886U JP 2087886 U JP2087886 U JP 2087886U JP H0448154 Y2 JPH0448154 Y2 JP H0448154Y2
- Authority
- JP
- Japan
- Prior art keywords
- induction motor
- switch
- liquid resistor
- switches
- resistance value
- 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.)
- Expired
Links
- 230000006698 induction Effects 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 20
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Motor And Converter Starters (AREA)
Description
【考案の詳細な説明】
〔考案の技術分野〕
本考案は大きな起動トルクを必要とする重負荷
を駆動する巻線形の誘導電動機の２次抵抗制御装
置に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a secondary resistance control device for a wound induction motor that drives a heavy load that requires a large starting torque.
従来、巻線形誘導電動機により起動される大き
な起動トルクを必要とする重負荷においては、そ
の起動トルクを得る為に液体抵抗器の抵抗値を大
きくする必要がある為に電解液の濃度を薄くして
いた。しかしながら、液体抵抗器の電極の形状及
び電極間距離は、ほぼ一定化されており、２次短
絡時に液体抵抗器の残留抵抗値が大きくなるの
で、２次短絡運転に移行する前に液体抵抗器を切
り離し、液体抵抗器の残留抵抗値より小さい抵抗
値の抵抗器を液体抵抗器に並列に挿入し、並列に
挿入された抵抗器で運転してから２次短絡運転に
移行するので非常に不経済となつている。
Conventionally, in heavy loads that require a large starting torque started by a wound induction motor, it is necessary to increase the resistance value of a liquid resistor in order to obtain that starting torque, so the electrolyte concentration is reduced. was. However, the shape of the electrodes and the distance between the electrodes of a liquid resistor are almost constant, and the residual resistance value of the liquid resistor increases in the event of a secondary short circuit. This is extremely inconvenient because it involves disconnecting the resistor, inserting a resistor with a resistance smaller than the residual resistance of the liquid resistor in parallel with the liquid resistor, and then operating with the resistor inserted in parallel before shifting to secondary short-circuit operation. It has become an economy.
本考案は上記のような問題を解決するために成
されたもので、その目的は大きな起動トルクを必
要とする重負荷を起動する巻線形の誘導電動機に
使用する液体抵抗器の抵抗値が起動時に大きくと
れ、２次短絡時には小さい残留抵抗値で２次短絡
運転に移行できることが可能な誘導電動機の２次
抵抗制御装置を提供することにある。
This invention was developed to solve the above-mentioned problems, and its purpose is to reduce the resistance value of the liquid resistor used in wound-type induction motors that start heavy loads that require a large starting torque. It is an object of the present invention to provide a secondary resistance control device for an induction motor, which is capable of increasing the residual resistance value at times and shifting to secondary short circuit operation with a small residual resistance value when a secondary short circuit occurs.
本考案は大きな起動トルクを必要とする重負荷
を駆動する巻線形誘導電動機を、その２次側に設
けられた液体抵抗器により起動するものにおい
て、誘導電動機と液体抵抗器との間に設けられか
つ負荷の起動途中に閉する第１の開閉器と、この
第１の開閉器と並列に設けられかつ負荷の起動当
初に閉する２組の開閉器と、これら２組の開閉器
相互間に直列に設けられた降圧用の変圧器とを備
えた誘導電動機の２次抵抗制御装置である。
The present invention starts a wound type induction motor that drives a heavy load that requires a large starting torque using a liquid resistor installed on the secondary side of the motor. and a first switch that closes during the start of the load, two sets of switches that are installed in parallel with this first switch and close at the beginning of the start of the load, and a switch between these two sets of switches. This is a secondary resistance control device for an induction motor including a step-down transformer provided in series.
以下、本考案の一実施例を説明する。第１図
は、本考案による誘導電動機の２次抵抗制御装置
の構成図を示したものである。第１図において、
１は巻線形の誘導電動機であり、その２次側には
液体抵抗器２を接続して起動が可能にしている。
また、３は誘導電動機１と液体抵抗器２との間に
設けられ、かつ誘導電動機１の起動途中に閉路す
る開閉器、４，５は開閉器３と並列に設けられ、
かつ誘導電動機１の起動当初に閉路する２組の開
閉器、６は開閉器４，５の間に直列に設けられ、
かつ誘導電動機１の２次電圧を降圧するための変
圧器、７は２次短絡運転用の開閉器である。
An embodiment of the present invention will be described below. FIG. 1 shows a configuration diagram of a secondary resistance control device for an induction motor according to the present invention. In Figure 1,
1 is a wound type induction motor, and a liquid resistor 2 is connected to the secondary side of the motor to enable starting.
Further, 3 is a switch that is provided between the induction motor 1 and the liquid resistor 2 and closes during startup of the induction motor 1; 4 and 5 are provided in parallel with the switch 3;
In addition, two sets of switches 6, which are closed at the beginning of starting the induction motor 1, are provided in series between the switches 4 and 5,
A transformer is used to step down the secondary voltage of the induction motor 1, and 7 is a switch for secondary short-circuit operation.
次に、かかる如く構成した誘導電動機の２次抵
抗制御装置において、誘導電動機１を起動する時
に、開閉器３を開路すると共に開閉器４，５を閉
路することにより、変圧器６にて誘導電動機１の
２次電圧を降圧して液体抵抗器２によつて起動を
開始する。ここで、例えば誘導電動機１の２次電
圧を降圧する変圧器６にて1/√3倍の大きさに電
圧を降圧すれば流れる電流は√３倍となり液体抵
抗器２の抵抗値は1/3倍でよいことになる。しか
しながら、電動機の等価回路より、誘導電動機１
の１次側から見た２次抵抗r2′は
r2′・（N1／N2）2r2
で与えられるので、２次電圧を変圧器６にて1/√
３倍に降圧することは誘導電動機１の１次側有効
巻数N1が√３N1になつたと同等となるため、１
次側から見た２次抵抗は
（√３N1／N2）2r2
になつたことになる。従つて誘導電動機１の１次
側から見た液体抵抗器２の抵抗値が３倍になつた
のと同等となる。即ち液体抵抗器２は、大きな起
動トルクを出すに必要な抵抗値の1/3倍の抵抗値
で大きな起動トルクを誘導電動機１に発生させる
ことができる。次に起動を開始し、負荷の回転数
が上つていくと、一般的に負荷トルクは急激に下
がるので、ここで、開閉器３を閉路すると共に開
閉器４，５を開路することにより、液体抵抗器２
で通常起動を行なつて加速し、最小抵抗値、即ち
残留抵抗値になつた時、開閉路７を閉路して２次
短絡運転に移行する。尚、第２図は本考案の装置
による抵抗値−速度特性を示したもので２１は開
閉路４，５を閉路したときの特性曲線、２２は開
閉器３を閉路したときの特性曲線、２３は液体抵
抗器の残留抵抗値、２４は２次短絡点、２５は定
格すべり値である。 Next, in the secondary resistance control device for an induction motor configured as described above, when starting the induction motor 1, by opening the switch 3 and closing the switches 4 and 5, the transformer 6 is connected to the induction motor. The secondary voltage of 1 is stepped down and starting is started by the liquid resistor 2. For example, if the secondary voltage of the induction motor 1 is stepped down to 1/√3 times by the transformer 6, the current flowing will be √3 times, and the resistance value of the liquid resistor 2 will be 1/√3 times the voltage. It would be good to triple it. However, from the equivalent circuit of the motor, the induction motor 1
The secondary resistance r 2 ′ seen from the primary side of
Stepping down the voltage by three times is equivalent to increasing the effective number of turns N 1 on the primary side of the induction motor 1 to √3N 1 , so 1
The secondary resistance seen from the next side is (√3N 1 /N 2 ) 2 r 2 . Therefore, this is equivalent to triple the resistance value of the liquid resistor 2 when viewed from the primary side of the induction motor 1. That is, the liquid resistor 2 can cause the induction motor 1 to generate a large starting torque with a resistance value that is 1/3 times the resistance value required to generate a large starting torque. Next, when starting starts and the load rotation speed increases, the load torque generally decreases rapidly, so by closing the switch 3 and opening the switches 4 and 5, the liquid Resistor 2
It performs normal startup and accelerates, and when the minimum resistance value, that is, the residual resistance value is reached, the opening/closing path 7 is closed and the operation shifts to secondary short circuit operation. In addition, FIG. 2 shows the resistance value-speed characteristics of the device of the present invention, where 21 is the characteristic curve when the switching circuits 4 and 5 are closed, 22 is the characteristic curve when the switch 3 is closed, and 23 is the characteristic curve when the switch 3 is closed. is the residual resistance value of the liquid resistor, 24 is the secondary short circuit point, and 25 is the rated slip value.
以上説明したように、本考案によれば、大きな
起動トルクを必要とする重負荷を駆動する誘導電
動機とその液体抵抗器との間に起動途中に閉路す
る第１の開閉器を設け、この第１の開閉器と並列
に起動当初に閉路する２組の開閉器を設け、かつ
これら２組の開閉器の間に直列に降圧用の変圧器
を設けたので、通常起動の定格の液体抵抗器で移
動当初、大きな起動トルクを発生でき、しかも２
次短絡運転に平滑に移行できる誘導電動機の２次
抵抗制御装置を提供できる。
As explained above, according to the present invention, a first switch that closes during startup is provided between an induction motor that drives a heavy load that requires a large starting torque and its liquid resistor. Two sets of switches that close at the beginning of startup are installed in parallel with switch 1, and a step-down transformer is installed in series between these two sets of switches, so a liquid resistor rated for normal startup is used. At the beginning of movement, a large starting torque can be generated, and 2
It is possible to provide a secondary resistance control device for an induction motor that can smoothly transition to secondary short-circuit operation.
第１図は本考案の一実施例を示す２次抵抗制御
装置の回路構成図、第２図は第１図の抵抗値−速
度特性を示す説明図である。
１……誘導電動機、２……液体抵抗器、３，
４，５，７……開閉器、６……変圧器。
FIG. 1 is a circuit configuration diagram of a secondary resistance control device showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the resistance value-speed characteristic of FIG. 1. 1...Induction motor, 2...Liquid resistor, 3,
4, 5, 7... Switch, 6... Transformer.
Claims (1)
設けられた液体抵抗器により起動する誘導電動機
の２次抵抗制御装置において、前記誘導電動機と
液体抵抗器との間に設けられかつ前記負荷の起動
途中に閉路する第１の開閉器と、この第１の開閉
器と並列に設けられかつ前記負荷の起動当初に閉
路する２組の開閉器と、これら２組の開閉器の間
に直列に設けられた降圧用の変圧器とを備えて成
ることを特徴とする誘導電動機の２次抵抗制御装
置。 A secondary resistance control device for an induction motor that starts a load requiring a large starting torque with a liquid resistor provided on the secondary side, wherein the device is provided between the induction motor and the liquid resistor and starts the load. A first switch that closes in the middle, two sets of switches that are provided in parallel with this first switch and that close at the beginning of the start of the load, and a switch that is provided in series between these two sets of switches. 1. A secondary resistance control device for an induction motor, comprising a step-down transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2087886U JPH0448154Y2 (en) | 1986-02-18 | 1986-02-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2087886U JPH0448154Y2 (en) | 1986-02-18 | 1986-02-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62135596U JPS62135596U (en) | 1987-08-26 |
| JPH0448154Y2 true JPH0448154Y2 (en) | 1992-11-12 |
Family
ID=30816796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2087886U Expired JPH0448154Y2 (en) | 1986-02-18 | 1986-02-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0448154Y2 (en) |
-
1986
- 1986-02-18 JP JP2087886U patent/JPH0448154Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62135596U (en) | 1987-08-26 |
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