JPH0241511B2 - - Google Patents
Info
- Publication number
- JPH0241511B2 JPH0241511B2 JP59220124A JP22012484A JPH0241511B2 JP H0241511 B2 JPH0241511 B2 JP H0241511B2 JP 59220124 A JP59220124 A JP 59220124A JP 22012484 A JP22012484 A JP 22012484A JP H0241511 B2 JPH0241511 B2 JP H0241511B2
- Authority
- JP
- Japan
- Prior art keywords
- speed
- hoisting
- frequency
- setting device
- lower limit
- 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 - Lifetime
Links
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000000819 phase cycle Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
Landscapes
- Control Of Ac Motors In General (AREA)
- Control And Safety Of Cranes (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、巻上モータの可変速制御装置とし
てインバータユニツトを備えた可変速形電気ホイ
ストの改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a variable speed electric hoist equipped with an inverter unit as a variable speed control device for a hoisting motor.
従来この種の装置として、特開昭58−183594号
公報に示されたものがあつた。この装置は、速度
設定器でインバータユニツトの出力周波数を加減
するものであるため、巻上モータの速度を設定す
る際に、出力周波数を極端に低く設定すると、巻
上モータが篭形誘導電動機であり特に力行運動時
大幅なトルク低下を起すため、巻上運転を行うと
吊荷が落下する可能性があつた。
A conventional device of this type was disclosed in Japanese Patent Application Laid-open No. 183594/1983. This device uses a speed setting device to adjust the output frequency of the inverter unit, so if you set the output frequency extremely low when setting the speed of the hoisting motor, the hoisting motor will become a cage induction motor. In particular, there was a significant torque drop during power running, so there was a possibility that the suspended load would fall during hoisting operation.
また、巻上モータの回転速度が巻上運転時は力
行運転で同期速度よりすべり分だけ遅くなり、巻
下運転時は回生運転で同期速度よりすべり分だけ
早くなるので、同一の速度設定に対して巻上運転
時と巻下運転時とでかなりの差が生じ、特に低速
運転において大きな速度差が発生する。 In addition, during hoisting operation, the rotation speed of the hoisting motor is slower than the synchronous speed by the amount of slip during power running, and during lowering operation, it is faster than the synchronous speed by the amount of slip due to regenerative operation, so for the same speed setting. There is a considerable difference between the hoisting operation and the lowering operation, and a particularly large speed difference occurs during low speed operation.
上記のような従来の可変速形電気ホイストで
は、出力周波数を極端に低くすると吊荷が落下し
たり、また、巻上時と巻下時とにおいて低速運転
で大きな速度差が生じる欠点があつた。
Conventional variable speed electric hoists such as those mentioned above have the drawbacks that if the output frequency is extremely low, the suspended load may fall, and that there is a large speed difference between hoisting and lowering at low speeds. .
この発明は上記のような従来のものの欠点を除
去するためになされたもので、低速度において、
吊荷の落下を防止できる可変速形電気ホイストを
得ることを目的とする。また、他の目的は巻上運
転時と巻下運転時との速度の差の小さい可変速形
電気ホイストを得ることを目的としている。 This invention was made to eliminate the drawbacks of the conventional ones as described above, and at low speeds,
The purpose of this invention is to obtain a variable speed electric hoist that can prevent suspended loads from falling. Another object is to obtain a variable speed electric hoist with a small difference in speed between hoisting and lowering operations.
〔問題点を解決するための手段〕
この発明に係る可変速電気ホイストは速度設定
器と直列に抵抗器を挿入し、その抵抗器を巻上げ
用と巻下げ用で抵抗値を変え、巻上げ用は巻上げ
運転時落下しない周波数を発生させる値、巻下げ
用は巻上運転時と巻下げ運転時とで運転速度が同
じになる値としたものある。[Means for solving the problem] The variable speed electric hoist according to the present invention inserts a resistor in series with the speed setting device, and changes the resistance value of the resistor for hoisting and hoisting. There is a value that generates a frequency that does not fall during hoisting operation, and a value that makes the operating speed the same during hoisting and lowering operations for lowering.
この発明においては、最低周波数が下限周波数
設定回路で制限されることになり、電動機は、所
定のトルク特性以上となり、巻上運転において、
吊荷が落下することは防止される。
In this invention, the lowest frequency is limited by the lower limit frequency setting circuit, and the electric motor has a predetermined torque characteristic or more, and in hoisting operation,
This prevents the suspended load from falling.
そして、低速運転において、巻上げ時と巻き下
げ時との回転速度が略同様となる。 In low-speed operation, the rotation speeds during winding up and down winding are approximately the same.
以下、落下防止の原理について第１図によつて
説明する。第１図において、１はインバータユニ
ツトで三相交流電源が給電線Ｒ、Ｓ、Ｔより供給
される。２は巻上モータで、インバータユニツト
１から出力される三相交流の相順に周波数に応じ
た回転方向と速度で回転する。３はブレーキで、
無通電時は巻上モータ２が回転しないようロツク
し、通電時は巻上モータ２が自由に回転できるよ
うに解放する。PBuは巻上運転用常開２段押込押
釦スイツチで１段目まで押込むとPBu１が閉じ、
２段目まで押込むと更にPBuhが閉じる。PBdは
巻下運転用常開２段押込押釦スイツチで１段目ま
で押込むとPBd１が閉じ、２段目まで押込むと更
にPBdhが閉じる。なお、押釦スイツチPBuと
PBdは機械的インターロツクにより同時には押せ
ないよう構成されている。４は電磁リレーのコイ
ルで巻上モータ２が巻上方向に回転する相順でイ
ンバータユニツト１が三相交流を出力するよう指
示する常開接点４ａ１を開閉する。５は電磁リレ
ーのコイルで、巻上モータ２が巻下方向に回転す
る相順でインバータユニツト１が三相交流を出力
するよう指示する常開接点５ａ１を開閉する。６
は電磁リレーのコイルで、インバータ１が三相交
流を出力している間付勢され、常開接点６ａ１を
開閉している。７は電磁リレーのコイルで、ブレ
ーキ３に通電する常開接点７ａ１，７ａ２を開閉
している。８及び９は夫々高速設定器、低速設定
器であり、夫々可変抵抗器で構成されている。１
０は下限周波数設定器で固定抵抗器からなつてい
る。１１は電磁リレーのコイルで、押ボタンスイ
ツチPBuあるいはPBdを２段目まで押込むと付勢
され、常開接点１１ａ１，１１ａ２と常閉接点１
１ｂ１，１１ｂ２との開閉により低速設定器９か
ら高速設定器８への切り替えがなされる。
The principle of fall prevention will be explained below with reference to FIG. In FIG. 1, numeral 1 denotes an inverter unit to which three-phase AC power is supplied from feed lines R, S, and T. Reference numeral 2 denotes a hoisting motor, which rotates in the rotational direction and speed according to the frequency of the three-phase alternating current outputted from the inverter unit 1. 3 is the brake,
When the hoisting motor 2 is not energized, it is locked so that it does not rotate, and when it is energized, the hoisting motor 2 is released so that it can rotate freely. PBu is a normally open two-stage push button switch for hoisting operation, and when pushed to the first stage, PBu1 closes.
Pushing it all the way to the second step will further close the PBuh. PBd is a normally open two-stage push button switch for lowering operation, and when pushed to the first stage, PBd1 closes, and when pushed to the second stage, PBdh is further closed. In addition, the push button switch PBu
PBd is configured so that it cannot be pressed at the same time due to a mechanical interlock. Reference numeral 4 denotes a coil of an electromagnetic relay which opens and closes a normally open contact 4a1 which instructs the inverter unit 1 to output three-phase alternating current in the phase sequence in which the hoisting motor 2 rotates in the hoisting direction. Reference numeral 5 denotes a coil of an electromagnetic relay, which opens and closes a normally open contact 5a1 which instructs the inverter unit 1 to output three-phase alternating current in the phase sequence in which the hoisting motor 2 rotates in the downward direction. 6
is a coil of an electromagnetic relay, which is energized while the inverter 1 is outputting three-phase alternating current, and opens and closes the normally open contact 6a1. 7 is a coil of an electromagnetic relay, which opens and closes normally open contacts 7a1 and 7a2 that energize the brake 3. Reference numerals 8 and 9 are a high speed setting device and a low speed setting device, respectively, each of which is composed of a variable resistor. 1
0 is the lower limit frequency setter and consists of a fixed resistor. 11 is an electromagnetic relay coil, which is energized when the push button switch PBu or PBd is pushed to the second stage, normally open contacts 11a1, 11a2 and normally closed contact 1.
Switching from the low speed setting device 9 to the high speed setting device 8 is performed by opening and closing 1b1 and 11b2.
次に第１図の装置の動作について第１図〜第４
図で説明する。時間ｔ１において、押ボタンスイ
ツチPBuを１段目まで押すと常開接点４ａ１が閉
じ、インバータユニツト１が周波数を０Hzから低
速設定器９で設定している周波数f2Hzまで、あら
かじめ設定された傾斜で増やし始める。時間ｔ２
において周波数がｆ１に達するとインバータユニ
ツト１は巻上モータ２に出力を開始すると同時に
電磁リレーコイル６を付勢するため、常開接点６
ａ１が閉成し、電磁リレーコイル７が付勢されて
常開接点７ａ１，７ａ２が閉成され、ブレーキ３
は通電状態となり、巻上モータ２が開放され巻上
方向に回転し始め、増速してゆく。時間ｔ３にお
いて、周波数ｆ２に達すると、インバータユニツ
ト１は周波数の増加を停止するので、巻上モータ
２は低速での定速回転で運転される。時間ｔ４に
おいて押しボタンスイツチPBuを更に２段目まで
押すと、電磁リレーのコイル１１が付勢され、低
速設定器９が切離され、高速設定器８が接続され
る。すると、インバータユニツト１は再び周波数
を高速設定器８で設定している周波数ｆ３まであ
らかじめ設定された傾斜で増加を開始し、巻上モ
ータ２は再び増速してゆく。時間ｔ５において周
波数ｆ３に達すると、インバータユニツト１は周
波数の増加を停止するので、巻上モータ２は高速
での定速回転で運転される。時間ｔ６において押
ボタンPBuを２段目から１段目に戻すと、高速設
定器８から低速設定器９に切り替えるので、イン
バータユニツト１は周波数をあらかじめ設定され
た傾斜で減らし始める。時間ｔ７で周波数ｆ２に
達すると減少を停止するので、巻上モータ２は低
速での定速回転で、運転される。時間ｔ８におい
て押ボタンPBuを押すのをやめると、電磁リレー
のコイル４は消勢され、常開接点４ａ１が開く。
するとインバータユニツト１は周波数を０Hzにな
るまであらかじめ設定された傾斜で減らし始め
る。時間ｔ９において、周波数ｆ１に達すると、
インバータユニツト１は巻上モータ２への出力を
停止すると同時に、電磁リレーのコイル６を消勢
するので、常開接点６ａ１が開放され、コイル７
が消勢して常開接点７ａ１，７ａ２が開放され、
ブレーキ３は無通電状態となり、巻上モータ２は
ロツクされ停止する。押ボタンスイツチPBdを押
した場合は、電磁リレーのコイル５が閉成され、
巻上モータ２が巻下方向に回転するだけで他の動
作は上記した押ボタンスイツチPBuを押した場合
と同じである。 Next, regarding the operation of the device shown in Fig. 1, Figs.
This will be explained with a diagram. At time t1, when the pushbutton switch PBu is pushed to the first step, the normally open contact 4a1 closes, and the inverter unit 1 increases the frequency from 0Hz to the frequency f2Hz set by the low speed setting device 9 at a preset slope. start. time t2
When the frequency reaches f1 at
a1 is closed, the electromagnetic relay coil 7 is energized, the normally open contacts 7a1 and 7a2 are closed, and the brake 3
becomes energized, the hoisting motor 2 is opened and begins to rotate in the hoisting direction, increasing speed. At time t3, when the frequency f2 is reached, the inverter unit 1 stops increasing the frequency, so the hoisting motor 2 is operated at a constant rotation speed at a low speed. At time t4, when the push button switch PBu is further pushed to the second stage, the coil 11 of the electromagnetic relay is energized, the low speed setting device 9 is disconnected, and the high speed setting device 8 is connected. Then, the inverter unit 1 again starts increasing the frequency at a preset slope up to the frequency f3 set by the high-speed setting device 8, and the hoisting motor 2 starts increasing its speed again. When the frequency f3 is reached at time t5, the inverter unit 1 stops increasing the frequency, so the hoisting motor 2 is operated at a constant speed at high speed. When the pushbutton PBu is returned from the second stage to the first stage at time t6, the high speed setting device 8 is switched to the low speed setting device 9, so that the inverter unit 1 starts reducing the frequency at a preset slope. When the frequency f2 is reached at time t7, the decrease stops, so the hoisting motor 2 is operated at a constant rotation speed at a low speed. When the pushbutton PBu is stopped being pressed at time t8, the coil 4 of the electromagnetic relay is deenergized and the normally open contact 4a1 is opened.
The inverter unit 1 then begins to reduce the frequency at a preset slope until it reaches 0Hz. When the frequency f1 is reached at time t9,
The inverter unit 1 stops the output to the hoisting motor 2 and at the same time de-energizes the coil 6 of the electromagnetic relay, so the normally open contact 6a1 is opened and the coil 7
is deenergized and the normally open contacts 7a1 and 7a2 are opened,
The brake 3 becomes de-energized, and the hoisting motor 2 is locked and stopped. When pushbutton switch PBd is pressed, coil 5 of the electromagnetic relay is closed,
The hoisting motor 2 only rotates in the lowering direction, and the other operations are the same as when the above-mentioned push button switch PBu is pressed.
ここで、下限周波数設定器１０の作用について
述べる。Ａ部の電圧VAは、高速設定器８、低速
設定器９の全抵抗を共にR1とし下限周波数設定
器１０の抵抗をR2とすると、インバータユニツ
ト１の端子Ｂ（＋5V）と端子Ｃ（0V）から供給さ
れる電圧5Vを分圧した次式の値となる。 Here, the operation of the lower limit frequency setter 10 will be described. The voltage VA of part A is determined by the terminal B (+5V) and terminal C (0V) of the inverter unit 1, assuming that the total resistance of the high-speed setting device 8 and the low-speed setting device 9 is both R1, and the resistance of the lower limit frequency setting device 10 is R2. The value is calculated by dividing the voltage 5V supplied from the following equation.
VA＝5R2／（R1＋R2）Ｖ
インバータユニツト１の端子Ｄに与えられる周
波数設定電圧は、高速設定器８あるいは低速設定
器９で＋5VとVAの間を分圧した電圧であるので
必ずVA以上となる。つまり、周波数設定電圧Ｖ
と設定周波数ｆとの関係は第３図に示した通りで
あり、設定周波数は必ずfA以上となる。 VA=5R2/(R1+R2)V The frequency setting voltage applied to terminal D of inverter unit 1 is a voltage divided between +5V and VA by high-speed setting device 8 or low-speed setting device 9, so it is always higher than VA. . In other words, the frequency setting voltage V
The relationship between and the set frequency f is as shown in FIG. 3, and the set frequency is always equal to or higher than fA.
第４図は巻上運転時の巻上モータ２の各周波数
におけるトルクと速度の関係を示したものであ
る。インバータユニツト１が出力を開始する周波
数ｆ１においてはトルクが負荷線を下回つてお
り、この周波数ｆ１で定速回転に入ろうとすると
吊荷が落下する。周波数fAのトルクは負荷線を
上回つており両者の交差する点でつり合い、下限
速度SAで定速回転に入ることができる。 FIG. 4 shows the relationship between torque and speed at each frequency of the hoisting motor 2 during hoisting operation. At the frequency f1 at which the inverter unit 1 starts outputting, the torque is below the load line, and if the constant speed rotation is attempted at this frequency f1, the suspended load will fall. The torque at frequency fA exceeds the load line and is balanced at the point where the two intersect, allowing constant speed rotation to occur at the lower limit speed SA.
第５図に示したように周波数fA時のトルクが
必ず負荷線を上回るようにVAを設定すれば、高
速設定器８あるいは低速設定器９をいくら変化さ
せても設定周波数ｆ２，ｆ３は必ずfA以上であ
るので吊荷が落下することはない。 As shown in Fig. 5, if VA is set so that the torque at frequency fA always exceeds the load line, no matter how much the high speed setting device 8 or low speed setting device 9 is changed, the set frequencies f2 and f3 will always be fA. Because of the above, the suspended load will not fall.
以上が落下防止の原理であり、次にこの発明の
一実施例を図について説明する。第５図におい
て、１００は巻下運転用下限周波数設定器、５ａ
２は電磁リレーのコイル５の付勢によつて閉成す
る常開接点で、その閉成によつて下限周波数設定
器１００がインバータユニツト１の端子Ｃに接続
される。５ｂ２は常閉接点で、解放されることに
より下限周波数設定器１０が切離される。その他
の構成の説明は第１図の説明と同様につき省略す
る。 The above is the principle of fall prevention, and next, one embodiment of the present invention will be described with reference to the drawings. In FIG. 5, 100 is a lower limit frequency setter for lowering operation, 5a
Reference numeral 2 denotes a normally open contact which is closed by the energization of the coil 5 of the electromagnetic relay, and its closing connects the lower limit frequency setter 100 to the terminal C of the inverter unit 1. 5b2 is a normally closed contact, and when it is released, the lower limit frequency setter 10 is disconnected. The description of the other configurations is the same as that of FIG. 1 and will be omitted.
次にこの発明の動作について第５図と第６図で
説明する。まず、低速設定器９を最低速に設定
し、押ボタンPBuを１段目まで押し込み巻上低速
運動をすると、インバータユニツト１の端子Ｄに
与えられる電圧はVAとなり設定周波数はfAとな
る。巻上運転時の巻上モータ２の回転速度は力行
運転であるため同期速度SASよりもすべり分だ
け遅い速度SAとなる。設定周波数fAのままで、
押ボタンスイツチPBdを１段目まで押し込んで巻
下低速運転状態にすると、巻下運転時の巻上モー
タ２の回転速度は、回生運転であるため、同期速
度SAsよりもすべり分だけ早い速度SAdとなり、
巻上運転時の速度SAよりかなり早い速度で回転
することになる。そこで、巻下運転時には下限周
波数設定器１０よりも抵抗値の小さい巻下運転時
下限周波数設定器１００に切り替えてＡ点の電圧
をVAよりも低くして、設定周波数をfAよりも低
いfAdとする。こうすることにより、巻下運転で
も巻上運転と同じ速度で運転できる。なお、高速
設定器８を最高速に設定し、押ボタンPBuあるい
はPBdを２段目まで押し込んで高速運転をした時
には設定周波数は巻上運転、巻下運転共に60Hzと
なるので、上記した低速時のようにすべり分を補
正する効果がない。 Next, the operation of the present invention will be explained with reference to FIGS. 5 and 6. First, when the low speed setting device 9 is set to the lowest speed and the push button PBu is pushed to the first stage to perform low speed hoisting, the voltage applied to the terminal D of the inverter unit 1 becomes VA and the set frequency becomes fA. Since the rotational speed of the hoisting motor 2 during hoisting operation is a power running operation, the rotational speed of the hoisting motor 2 is a speed SA that is slower than the synchronous speed SAS by the amount of slip. Keeping the set frequency fA,
When the pushbutton switch PBd is pushed to the first step to enter the low-speed lowering operation state, the rotational speed of the hoisting motor 2 during lowering operation is a regenerative operation, so the rotation speed SAd is faster than the synchronous speed SAs by the amount of slip. Then,
It will rotate at a speed much faster than the speed SA during hoisting operation. Therefore, during the lower limit frequency setting device 100, the lower limit frequency setter 100, which has a lower resistance value than the lower limit frequency setter 10, is used during the lower limit frequency setting device 10 to lower the voltage at point A than VA, and set the set frequency to fAd, which is lower than fA. do. By doing this, the lowering operation can be performed at the same speed as the hoisting operation. Furthermore, when the high-speed setting device 8 is set to the highest speed and the pushbutton PBu or PBd is pushed to the second stage for high-speed operation, the set frequency will be 60Hz for both hoisting and lowering operations, so at the low speed mentioned above, It does not have the effect of compensating for the amount of slip.
つまり、すべり分による巻上運転と巻下運転と
の速度差は、補正しなかつた場合においては、低
速と高速であまり変わりがないので、すべり分に
よる速度差の影響は低速運転の場合に目立つこと
になる。従つて上記のように低速域で十分補正を
加えておけば、操作する際、速度差を感じること
はない。 In other words, the speed difference between hoisting operation and lowering operation due to slipping does not change much between low speed and high speed if no correction is made, so the effect of the speed difference due to slipping is more noticeable in low speed operation. It turns out. Therefore, if sufficient correction is made in the low speed range as described above, you will not feel any speed difference when operating the vehicle.
なお、上記実施例では下限周波数設定器１０お
よび巻下運転用下限周波数設定器１００は固定抵
抗器としたが可変抵抗器としても良く、この場合
巻上運転の最低周波数fAと巻下運転の最低周波
数fAdの最適値を得られるという効果がある。 In the above embodiment, the lower limit frequency setter 10 and the lower limit frequency setter 100 for hoisting operation are fixed resistors, but they may also be variable resistors. In this case, the lowest frequency fA for hoisting operation and the lowest frequency for lowering operation This has the effect that the optimum value of the frequency fAd can be obtained.
この発明は以上のように、下限周波数設定回路
を備えたので、高速設定器、低速設定器をどのよ
うに設定しても吊荷が落下することを防止できる
効果がある。また、下限速度設定回路を備え、し
かも、巻上、巻下の指示に対応して下限速度設定
を切り替えられるように構成したので、操作する
際、巻上運転と巻下運転の速度差を解消できるた
め、低速巻下げの停止精度を向上できるという効
果がある。
As described above, since the present invention includes the lower limit frequency setting circuit, it is possible to prevent the hanging load from falling no matter how the high speed setting device and the low speed setting device are set. In addition, it is equipped with a lower limit speed setting circuit and is configured so that the lower limit speed setting can be switched in response to instructions for hoisting and lowering, eliminating the speed difference between hoisting and lowering operations when operating. This has the effect of improving the stopping accuracy of low-speed lowering.
第１図はこの発明の一実施例の電気回路図、第
２図はこの発明の押ボタン操作とインバータユニ
ツト出力周波数との関係を表した特性図、第３図
はこの発明の一実施例の周波数設定電圧に対する
設定周波数の変化を表した特性図、第４図はこの
発明の巻上運転時における巻上モータの回転速度
とトルクの関係を表した特性図、第５図はこの発
明の他の実施例を示す電気回路図、第６図はこの
発明の巻上運転、巻下運転における巻上モータの
回転速度とトルクの関係を表した特性図である。
図において、１はインバータユニツト、２は巻上
モータ、３はブレーキ、４ないし７は電磁リレー
のコイル、８は高速設定器、９は低速設定器、１
０は下限周波数設定器、１００は巻下運転用下限
周波数設定器、１１は電磁リレーのコイルであ
る。なお、各図中同一符号は同一又は相当部分を
示す。
Fig. 1 is an electric circuit diagram of an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the relationship between the push button operation of the invention and the output frequency of the inverter unit, and Fig. 3 is an electrical circuit diagram of an embodiment of the invention. FIG. 4 is a characteristic diagram showing the change in the set frequency with respect to the frequency setting voltage. FIG. 4 is a characteristic diagram showing the relationship between the rotational speed and torque of the hoisting motor during hoisting operation according to the present invention. FIG. FIG. 6 is a characteristic diagram showing the relationship between the rotational speed and torque of the hoisting motor during hoisting and lowering operations of the present invention.
In the figure, 1 is an inverter unit, 2 is a hoisting motor, 3 is a brake, 4 to 7 are electromagnetic relay coils, 8 is a high speed setting device, 9 is a low speed setting device, 1
0 is a lower limit frequency setter, 100 is a lower limit frequency setter for lowering operation, and 11 is a coil of an electromagnetic relay. Note that the same reference numerals in each figure indicate the same or corresponding parts.
Claims (1)
ンバータユニツトで発生する周波数を制御するこ
とで巻上げモータの回転速度を制御して巻上げ運
転および巻下げ運転を行う可変速形電気ホイスト
において、 巻上げ運転時に速度設定器と直列に接続される
第１の抵抗器からなる第１の下限周波数設定器
と、 巻下げ運転時に速度設定器と直列に接続される
第２の抵抗器からなる第２の下限周波数設定器と
を備え、 第１の抵抗器の抵抗値は巻上げに要するトルク
よりも大きなトルクが得られる周波数を発生する
値とし、 第２の抵抗器の抵抗値は巻下げ速度と巻上げ速
度とが同じになるように設定されることを特徴と
する可変速形電気ホイスト。[Claims] 1. A variable speed type that controls the rotational speed of a hoisting motor to perform hoisting and lowering operations by adjusting a speed setting device consisting of a variable resistor and controlling the frequency generated by an inverter unit. In an electric hoist, a first lower limit frequency setter consisting of a first resistor is connected in series with the speed setter during hoisting operation, and a second resistor is connected in series with the speed setter during lowering operation. A second lower limit frequency setter consisting of A variable speed electric hoist characterized in that lowering speed and hoisting speed are set to be the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22012484A JPS61101397A (en) | 1984-10-18 | 1984-10-18 | Variable speed type electric hoist |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22012484A JPS61101397A (en) | 1984-10-18 | 1984-10-18 | Variable speed type electric hoist |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61101397A JPS61101397A (en) | 1986-05-20 |
| JPH0241511B2 true JPH0241511B2 (en) | 1990-09-18 |
Family
ID=16746285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22012484A Granted JPS61101397A (en) | 1984-10-18 | 1984-10-18 | Variable speed type electric hoist |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61101397A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH079891Y2 (en) * | 1988-05-20 | 1995-03-08 | 株式会社明電舎 | Hoist operating device |
| JPH0822718B2 (en) * | 1988-09-20 | 1996-03-06 | 日立機電工業株式会社 | Operating device for crane speed control |
| KR940001098B1 (en) * | 1988-12-28 | 1994-02-14 | 미쯔비시 덴끼 가부시기가이샤 | Variable speed electric hoist |
| US5139156A (en) * | 1988-12-28 | 1992-08-18 | Mitsubishi Denki K.K. | Variable speed electric hoist |
| JPH0466498A (en) * | 1990-07-06 | 1992-03-02 | Hitachi Kiden Kogyo Ltd | Method for controlling hoisting speed of crane |
| JP5204436B2 (en) * | 2007-07-27 | 2013-06-05 | 株式会社キトー | Hoisting machine operation control device and operation control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58170392A (en) * | 1982-03-29 | 1983-10-06 | Mitsubishi Electric Corp | Controller for elevator |
| JPS58197195A (en) * | 1982-05-14 | 1983-11-16 | 株式会社日立製作所 | Variable speed winch |
| JPS58207290A (en) * | 1982-05-26 | 1983-12-02 | 日立機電工業株式会社 | Controller for winding of mobile travelling body |
-
1984
- 1984-10-18 JP JP22012484A patent/JPS61101397A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58170392A (en) * | 1982-03-29 | 1983-10-06 | Mitsubishi Electric Corp | Controller for elevator |
| JPS58197195A (en) * | 1982-05-14 | 1983-11-16 | 株式会社日立製作所 | Variable speed winch |
| JPS58207290A (en) * | 1982-05-26 | 1983-12-02 | 日立機電工業株式会社 | Controller for winding of mobile travelling body |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61101397A (en) | 1986-05-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1520829A1 (en) | Controller of elevator | |
| JPH0241511B2 (en) | ||
| US4122919A (en) | Speed control apparatus for AC elevator | |
| JP2588659B2 (en) | Variable speed hoist | |
| JP2888670B2 (en) | Elevator regenerative power consumption method | |
| JP2000211829A (en) | Elevator control device | |
| US3078406A (en) | Multi-range hoist system | |
| US2774923A (en) | Electric control for alternatingcurrent motor | |
| JPS5844592B2 (en) | elevator elevator | |
| JPH05124793A (en) | Variable speed winding machine | |
| US1503245A (en) | Motor controller | |
| US2421431A (en) | Controller for induction motors | |
| US1400077A (en) | keith | |
| JP2646822B2 (en) | Inverter operation state switching method | |
| US1883886A (en) | Motor-control system | |
| JPH0597399A (en) | Variable speed hoisting machine | |
| SU1730021A1 (en) | Bucket crane winch control device | |
| US2528126A (en) | Variable voltage motor control system | |
| JPS6218984A (en) | Quick stopping device of induction motor | |
| SU1086532A1 (en) | Device for braking asynchronous motor | |
| US1756572A (en) | Motor-control system | |
| US1411040A (en) | Control system | |
| US1367137A (en) | Motor-control system | |
| KR820000864B1 (en) | Elevator speed control system | |
| JPH0458785A (en) | Carrier driver |