JP2593270B2 - Power measurement type load detector - Google Patents
Power measurement type load detectorInfo
- Publication number
- JP2593270B2 JP2593270B2 JP4107737A JP10773792A JP2593270B2 JP 2593270 B2 JP2593270 B2 JP 2593270B2 JP 4107737 A JP4107737 A JP 4107737A JP 10773792 A JP10773792 A JP 10773792A JP 2593270 B2 JP2593270 B2 JP 2593270B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- reference voltage
- load
- power
- power supply
- 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 - Fee Related
Links
Landscapes
- Control And Safety Of Cranes (AREA)
- Control Of Ac Motors In General (AREA)
- Stopping Of Electric Motors (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は吊荷を揚げ下げする電動
チェーンブロック、ホイスト、クレーン等を駆動する巻
上電動機の負荷検出装置に関し、特に、巻上電動機の入
力電力を測定し、電源電圧変動に対応した入力電力に基
づき、過負荷設定検出電力を超えた時は巻上電動機の上
昇停止指令を発生し、さらに軽負荷設定検出電力を基準
として軽負荷か否かを検出し巻上電動機の高速／低速の
切換を行う負荷検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load detecting device for a hoisting motor for driving an electric chain block, hoist, crane, etc. for lifting and lowering a suspended load, and more particularly, to measuring the input power of the hoisting motor to determine a power supply voltage. Based on the input power corresponding to the fluctuation, when the overload set detection power is exceeded, a command to raise and stop the hoisting motor is issued. The present invention relates to a load detecting device for switching between high speed and low speed.
【０００２】[0002]
【従来の技術】電気ホイスト等において、巻上電動機の
入力電力を測定し吊荷荷重の過負荷を検出する方法は既
に知られている。この方法は巻上電動機の入力電力から
吊荷荷重を読み取り、過負荷吊り上げ時に上昇指令を停
止する方法である。一方、巻上電動機に吊荷荷重をかけ
ないときは、先端のフックやチェーン等の荷重が巻上電
動機への軽負荷としてかかってくるが、従来このような
軽負荷のときは、操作員が手元の低速／高速釦を操作す
ることによりチェーンの移動速度を高速にしていた。即
ち、例えばチェーンに弛みがある時は高速にして弛みを
無くし、吊荷へのフックの移動を速める時にも高速に
し、さらにフックが吊荷に接近した時は低速にするよう
な操作を、手元の低速／高速釦を切り換えることにより
行っていた。2. Description of the Related Art In an electric hoist or the like, a method of measuring an input power of a hoist motor and detecting an overload of a suspended load is already known. This method is a method of reading a load from the input electric power of a hoisting motor and stopping a rising command when an overload is lifted. On the other hand, when no load is applied to the hoisting motor, the load of the hook or chain at the tip is applied as a light load to the hoisting motor. By operating the low speed / high speed button at hand, the moving speed of the chain was increased. That is, for example, when the chain is loose, the speed is increased to eliminate the slack, the speed of moving the hook to the suspended load is increased, and the speed is reduced when the hook approaches the suspended load. By switching the low speed / high speed button.
【０００３】図９は従来の負荷検出装置における過負荷
検出の概念を説明するグラフである。縦軸は電動機の入
力電力、横軸は電動機に供給される電源電圧、曲線ａは
定格荷重時に用いる曲線であり、曲線ｂは過負荷検出設
定荷重時に用いる曲線である。図９において、負荷検出
装置は所定値に設定された過負荷検出設定電力に基づ
き、電源電圧の変化を無視して、この過負荷設定電力を
超えた場合に上昇指令を停止している。FIG. 9 is a graph illustrating the concept of overload detection in a conventional load detection device. The vertical axis is the input power of the motor, the horizontal axis is the power supply voltage supplied to the motor, the curve a is the curve used at the rated load, and the curve b is the curve used at the overload detection set load. In FIG. 9, the load detection device ignores the change in the power supply voltage based on the overload detection set power set to a predetermined value, and stops the rising command when the overload set power is exceeded.
【０００４】[0004]
【発明が解決しようとする課題】即ち、図９において、
過負荷検出設定電力を例えばＷ１に設定したとする。こ
の場合、負荷検出装置が作動して上昇指令の停止を行う
のは曲線ｂとの交点から電源電圧がＶ１のときのみであ
る。また、電源電圧がＶ２まで上昇したとすると、負荷
検出装置は、Ｗ１と曲線ａと電圧Ｖ２との交点、即ち、
定格荷重で作動して上昇指令を停止してしまい、逆に電
源電圧がＶ３まで下降すると、この電圧では設定電力Ｗ
１と曲線Ｂとの間に余裕があるので、曲線ｂの設定荷重
よりも大きな荷重でなければ作動しないという不都合が
ある。That is, in FIG. 9,
It is assumed that the overload detection set power is set to, for example, W1. In this case, the load detection device operates to stop the rising command only when the power supply voltage is V1 from the intersection with the curve b. Further, assuming that the power supply voltage has risen to V2, the load detection device determines the intersection of W1, the curve a, and the voltage V2, that is,
If the power supply voltage drops to V3 when the power supply voltage drops to V3, the set power W
Since there is a margin between 1 and the curve B, there is a disadvantage that the operation is not performed unless the load is larger than the set load of the curve b.
【０００５】図１０は直線近似を説明するグラフであ
る。上述のような不都合に対処するために、本図に示す
ように、過負荷検出設定電力を電源電圧に対して直線的
に近似した方法が考えられる。即ち、図示のように、曲
線ａ及びｂを考慮した直線を設け、この直線に沿って過
負荷検出設定電力を変化させている。例えば、電源電圧
Ｖ４では設定電力はＷ４であり、電源電圧Ｖ５では設定
電力はＷ５である。この方法による利点は負荷検出装置
を簡素化できるので低コスト化が図れることである。FIG. 10 is a graph for explaining linear approximation. In order to cope with the above-described inconvenience, a method in which the overload detection set power is linearly approximated to the power supply voltage as shown in FIG. That is, as shown in the drawing, a straight line considering the curves a and b is provided, and the overload detection set power is changed along the straight line. For example, at the power supply voltage V4, the set power is W4, and at the power supply voltage V5, the set power is W5. The advantage of this method is that the load detection device can be simplified, and the cost can be reduced.
【０００６】しかし、この方法では以下のような問題が
ある。即ち、電源電圧Ｖ１’では、一点鎖線の直線と曲
線ｂとの差から明らかなように、曲線ｂに示す過負荷設
定荷重よりも大幅に大きな設定荷重でなければ負荷検出
装置が作動しないという不都合がある。また、電源電圧
Ｖ２’では、直線と曲線ａとの差が小さいので、曲線ａ
に示す定格荷重付近で負荷検出装置が作動してしまうと
いう不都合がある。このように、上述の直線で近似する
方法では電源電圧の変動に対する過負荷検出の精度上の
問題がある。However, this method has the following problems. That is, at the power supply voltage V1 ', as is apparent from the difference between the dashed line and the curve b, the load detection device does not operate unless the set load is much larger than the overload set load shown by the curve b. There is. Further, at the power supply voltage V2 ', since the difference between the straight line and the curve a is small, the curve a
However, there is an inconvenience that the load detection device operates near the rated load shown in FIG. As described above, the above-described method of approximating with a straight line has a problem in the accuracy of overload detection with respect to the fluctuation of the power supply voltage.
【０００７】従って、このような不都合をなくして正確
に過負荷検出設定荷重にて負荷検出装置を作動させるに
は、理想的には電源電圧Ｖ１の時は設定電力Ｗ１で、電
源電圧Ｖ２の時は設定電力Ｗ２で、電源電圧Ｖ３の時は
設定電力Ｗ３で、電源電圧の変動に追従して自動的に過
負荷検出設定電力を変化させてやる必要がある。しか
し、この理想的な方法では負荷検出装置の精度は確保で
きても、そのための装置が大規模となり低コスト化が図
れないという問題がある。Therefore, in order to eliminate the inconvenience and operate the load detecting device accurately with the set load for overload detection, ideally, the power supply voltage V1 is the set power W1 and the power supply voltage V2 is the set power W1. Is the set power W2, and when the power supply voltage is V3, it is necessary to automatically change the overload detection set power in accordance with the fluctuation of the power supply voltage. However, in this ideal method, even if the accuracy of the load detection device can be ensured, there is a problem that the device for that purpose becomes large-scale and cost reduction cannot be achieved.
【０００８】そこで、本発明の目的は、電源電圧の変動
に対する過負荷検出の精度上に問題がなく、かつ低コス
ト化を図り、さらに軽負荷か否かを検出して高速／低速
の切り換えを行うことができる負荷検出装置を提供する
ことにある。[0008] Therefore, an object of the present invention is to provide a high-speed / low-speed switch by detecting whether or not the load is light, without causing a problem in the accuracy of the overload detection with respect to the fluctuation of the power supply voltage, reducing the cost. An object of the present invention is to provide a load detection device that can perform the load detection.
【０００９】[0009]
【課題を解決するための手段】本発明は、巻上電動機Ｍ
の入力電力Ｗを測定して負荷を検出する電力測定式負荷
検出装置において、該入力電力を測定し該入力電力に比
例した換算電圧ＶO を送出する電力変換手段１と、該巻
上電動機に供給する電源電圧の変動を検出し、該変動を
所定レベルに補正する電圧変動補正手段２と、該補正さ
れた電圧変動を入力し、該電源電圧の変動に対応した過
負荷検出設定曲線に直線近似した少なくとも２本の直線
を設定する各素子Ｒ1 ，Ｒ2 の値を決定し、該電圧の変
動に対応して変化する電流値を過負荷検出基準電圧Ｖfs
として発生する第１の基準電圧発生手段３と、該換算電
圧ＶO と該過負荷検出基準電圧Ｖfsとを比較し、該換算
電圧が該過負荷検出基準電圧Ｖfsを超えているとき、該
巻上電動機の上昇停止指令ＶS を発生する第１の比較手
段４と、該補正された電圧変動を入力し、該電源電圧の
変動に対応した軽負荷検出設定曲線に直線近似した少な
くとも２本の直線を設定する各素子Ｒ4 ，Ｒ5 の値を決
定し、該電圧の変動に対応して変化する電流値を軽負荷
検出基準電圧Ｖfcとして発生する第２の基準電圧発生手
段５と、該換算電圧ＶO と該軽負荷検出基準電圧Ｖfcと
を比較し、該換算電圧が該軽負荷検出基準電圧Ｖfcを超
えているときは低速に、逆のときは高速にするように、
該巻上電動機の高速／低速切換を行う速度切換指令Ｖc
を発生する第２の比較手段６とを備えることを特徴とす
る。SUMMARY OF THE INVENTION The present invention provides a hoisting motor M
A power conversion means 1 for measuring the input power and sending out a reduced voltage V O proportional to the input power; and a power conversion means 1 for measuring the input power and detecting a load. Voltage fluctuation correction means 2 for detecting fluctuations in the power supply voltage to be supplied and correcting the fluctuations to a predetermined level; and inputting the corrected voltage fluctuations, and forming a straight line on an overload detection setting curve corresponding to the fluctuations in the power supply voltage. The values of the elements R 1 and R 2 that set at least two approximated straight lines are determined, and the current value that changes in response to the voltage change is determined by the overload detection reference voltage V fs
Is compared with the converted voltage V O and the overload detection reference voltage V fs , and when the converted voltage exceeds the overload detection reference voltage V fs , a first comparison means 4 for generating a rising stop command V S on the motor the winding, at least entered a voltage change which is the correction, and the linear approximation to the light load detection setting curve corresponding to the variation of the power source voltage 2 The second reference voltage generator 5 determines the values of the elements R 4 and R 5 that set the straight line, and generates a current value that changes in response to the fluctuation of the voltage as the light load detection reference voltage Vfc. If, by comparing the said conversion voltage V O and the said light-load detection reference voltage V fc, the low speed when the converted voltage exceeds the said light load detection reference voltage V fc, so that the high speed when the inverse To
Speed for high-speed / low speed switching the winding on the motor switching command V c
And second comparing means 6 for generating
【００１０】[0010]
【作用】図１は本発明の基本的概念を説明するグラフで
ある。本発明では、過負荷を検出するときは、過負荷検
出の設定荷重曲線ｂに極めて近似した傾斜の異なる２本
の直線Ｉ及びIIを設け、この２本の直線に従って過負荷
検出設定電力を電源電圧の変動に応じて変化させる。こ
こで、２本の直線の交点は定格電圧Ｖ０との交点であ
る。即ち、直線Ｉは定格電圧よりも高い電源電圧側の曲
線ｂにほぼ近似させ、直線IIは定格電圧よりも低い電源
電圧の曲線ｂに近似させる。２本の直線の交点を定格電
圧にしたのは、定格電圧を中心にして高い方の変動と低
い方の変動を同じ範囲にするためである。FIG. 1 is a graph illustrating the basic concept of the present invention. According to the present invention, when detecting an overload, two straight lines I and II having different slopes that are very similar to the set load curve b for overload detection are provided, and the overload detection set power is supplied according to the two straight lines. It changes according to the fluctuation of the voltage. Here, the intersection of the two straight lines is the intersection with the rated voltage V0. That is, the straight line I approximates the curve b on the power supply voltage side higher than the rated voltage, and the straight line II approximates the curve b on the power supply voltage lower than the rated voltage. The reason why the intersection of the two straight lines is set to the rated voltage is to make the higher fluctuation and the lower fluctuation around the rated voltage the same range.
【００１１】一方、軽負荷を検出するときは、軽負荷検
出の設定荷重曲線ｂ’に極めて近似した傾斜の異なる２
本の直線Ｉ’及びII’を設け、この２本の直線に従って
軽負荷検出設定電力を電源電圧の変動に応じて変化させ
る。ここで、上述と同様に、２本の直線の交点は定格電
圧Ｖ０との交点である。即ち、直線Ｉ’は定格電圧より
も高い電源電圧側の曲線ｂ’にほぼ近似させ、直線II’
は定格電圧よりも低い電源電圧の曲線ｂ’に近似させ
る。２本の直線の交点を定格電圧にしたのは、定格電圧
を中心にして高い方の変動と低い方の変動を同じ範囲に
するためである。On the other hand, when a light load is detected, a light load having a different slope very similar to the set load curve b 'for light load detection is used.
Two straight lines I ′ and II ′ are provided, and the light load detection set power is changed according to the fluctuation of the power supply voltage according to the two straight lines. Here, as described above, the intersection of the two straight lines is the intersection with the rated voltage V0. That is, the straight line I ′ is approximated to the curve b ′ on the power supply voltage side higher than the rated voltage, and the straight line II ′
Is approximated to a curve b 'of the power supply voltage lower than the rated voltage. The reason why the intersection of the two straight lines is set to the rated voltage is to make the higher fluctuation and the lower fluctuation around the rated voltage the same range.
【００１２】図示のように、２種類の２本の直線（Ｉ−
II 及びＩ’−II' ）で近似すると、後述するように負
荷検出装置の簡素化が図れ、従って低コスト化が図れる
とともに、一方の２本の直線Ｉ，IIは曲線ｂに極めて近
似してるので、過負荷検出において高い精度を達成する
ことができ、また、他方の２本の直線Ｉ’，II’は曲線
ｂ’に極めて近似してるので、軽負荷か否かを検出して
速やかに高速／低速の切り換えを行うことができる。As shown, two types of two straight lines (I-
II and I'-II '), the load detecting device can be simplified and the cost can be reduced as described later, and one of the two straight lines I and II is very close to the curve b. Therefore, high accuracy can be achieved in overload detection, and since the other two straight lines I ′ and II ′ are very similar to the curve b ′, it is possible to detect whether the load is light or not and quickly High-speed / low-speed switching can be performed.
【００１３】なお、２本の直線Ｉ，IIに限定されるもの
ではなく、曲線ｂに近似した４本の直線にすることもで
きる。しかし、４本の方がより曲線ｂに近づくので高い
精度となることは明白であるが、逆に装置のコストアッ
プとなることも考慮しなければならない。同様に、２本
の直線Ｉ' ，II' に限定されるものではなく、曲線ｂ'
に近似した４本の直線にすることもできる。しかし、同
様に理由で逆に装置のコストアップとなることも考慮し
なければならない。Note that the present invention is not limited to the two straight lines I and II, but may be four straight lines approximating the curve b. However, it is obvious that the four lines are closer to the curve b and therefore the accuracy is high, but it is also necessary to consider that the cost of the apparatus increases. Similarly, it is not limited to the two straight lines I 'and II',
Can be made into four straight lines approximating. However, it is also necessary to consider that the cost of the apparatus is increased for the same reason.
【００１４】図２は図１の２本の直線Ｉ，IIを具体的に
したグラフである。横軸は電源電圧を示し、実際の使用
において、電源電圧は定格２００Ｖであり、１６０〜２
４０Ｖの範囲、即ち、±２０％の電源電圧変動があると
する。また、左側の縦軸は巻上電動機の入力電力を示
し、右側の縦軸は左側の入力電力の電圧換算を示し、実
際の使用において、７００〜１６００Ｗの範囲とする。
曲線ｂは過負荷検出設定荷重を示し、予め測定して求め
ておく。２本の直線Ｉ及びIIは曲線ｂに近似して設けら
れる。直線Ｉと直線IIの交点は定格電圧２００Ｖの点で
ある。これは、定格２００Ｖが中心電圧だからである。FIG. 2 is a graph specifically illustrating the two straight lines I and II in FIG. The horizontal axis indicates the power supply voltage. In actual use, the power supply voltage is rated at 200 V,
It is assumed that there is a power supply voltage fluctuation in a range of 40 V, that is, ± 20%. The vertical axis on the left side indicates the input power of the hoist motor, and the vertical axis on the right side indicates the voltage conversion of the input power on the left side. The range is 700 to 1600 W in actual use.
A curve b indicates a set load for overload detection, which is measured and obtained in advance. Two straight lines I and II are provided to approximate the curve b. The intersection of the straight line I and the straight line II is a point at a rated voltage of 200V. This is because the rated voltage of 200 V is the center voltage.
【００１５】過負荷検出設定電力は電源電圧の変動に従
い、この２本の直線に従って変化する。例えば、電源電
圧１８０Ｖでは過負荷検出設定電力は約９００Ｗであ
り、定格２００Ｖでは設定電力は９７０Ｗである。図示
のように、直線ＩもIIも曲線ｂに非常に近似しているの
で過負荷検出設定電力を高い精度で検出することができ
る。The set power for overload detection changes according to the fluctuation of the power supply voltage, and changes along these two straight lines. For example, at a power supply voltage of 180 V, the set power for overload detection is about 900 W, and at a rated voltage of 200 V, the set power is 970 W. As shown in the figure, since the straight lines I and II are very similar to the curve b, the overload detection set power can be detected with high accuracy.
【００１６】図３は図１の２本の直線Ｉ’，II’を具体
的にしたグラフである。横軸及び縦軸ともに図２と同様
なので説明を省略する。曲線ｂ’は軽負荷検出設定荷重
を示し、予め測定して求めておく。２本の直線Ｉ’及び
II’は曲線ｂ’に近似して設けられる。前述と同様に直
線Ｉ’と直線II’の交点は定格電圧２００Ｖの点であ
る。軽負荷検出設定電力は電源電圧の変動に従い、この
２本の直線に従って変化する。例えば、電源電圧１８０
Ｖでは軽負荷検出設定電力は約３６０Ｗであり、定格２
００Ｖでは設定電力は３７５Ｗである。図示のように、
直線Ｉ’もII’も曲線ｂ’に非常に近似しているので軽
負荷検出設定電力を高い精度で検出し高速／低速の切り
換えを行うことができる。FIG. 3 is a graph specifically illustrating the two straight lines I 'and II' of FIG. Both the horizontal axis and the vertical axis are the same as in FIG. A curve b 'indicates a light load detection set load, which is measured and obtained in advance. Two straight lines I 'and
II ′ is provided to approximate the curve b ′. As described above, the intersection of the straight line I ′ and the straight line II ′ is a point at the rated voltage of 200V. The light load detection set power changes according to the fluctuation of the power supply voltage, and changes along these two straight lines. For example, a power supply voltage of 180
In V, the light load detection set power is about 360 W
At 00V, the set power is 375W. As shown,
Since both the straight lines I ′ and II ′ are very similar to the curve b ′, it is possible to detect the light load detection set power with high accuracy and switch between high speed and low speed.
【００１７】[0017]
【実施例】図４は本発明の負荷検出装置の基本構成図で
ある。１は電力検出回路、２は電圧変動用補正回路、３
は第１の基準電圧発生回路、４は第１の比較回路、５は
第２の基準電圧発生回路、６は第２の比較回路である。
また、Ｖfsは過負荷検出基準電圧、Ｖfcは軽負荷検出基
準電圧、ＶS は上昇停止指令、Ｖc は速度切換指令であ
る。FIG. 4 is a diagram showing the basic configuration of a load detecting device according to the present invention. 1 is a power detection circuit, 2 is a voltage fluctuation correction circuit, 3
Is a first reference voltage generation circuit, 4 is a first comparison circuit, 5 is a second reference voltage generation circuit, and 6 is a second comparison circuit.
Also, V fs overload detection reference voltage, V fc light load detection reference voltage, V S is raised stop command, the V c is the speed switching instruction.
【００１８】電力検出回路１は電動機の駆動時の電力を
検出する電力検出器であり、巻上電動機の１相に直列の
電流計を挿入し、２相間に電圧計を挿入して巻上電動機
にかかる電流と電圧を検出し、交流であるから電圧と電
流と力率の積の形で電力を算出する。さらに、本発明で
は電力に比例した電圧を取り出し、この電圧を比較対象
としている。電力検出器１において電力に比例した電圧
Ｖ0 を取り出すために、まず、図示しない一定抵抗に上
記の１相の電流を流し、電流の変化を一旦電圧の変化に
換算し、さらに周知の掛け算器により電圧と電圧の積の
形で取り出している。The power detection circuit 1 is a power detector for detecting the electric power when the motor is driven. A series ammeter is inserted into one phase of the hoisting motor, and a voltmeter is inserted between the two phases. , And the power is calculated in the form of a product of the voltage, the current, and the power factor because the current is an alternating current. Further, in the present invention, a voltage proportional to the power is taken out, and this voltage is used as a comparison object. In order to extract a voltage V 0 proportional to the electric power in the electric power detector 1, first, the above-described one-phase current is caused to flow through a not-shown constant resistor, and the current change is temporarily converted into a voltage change. Is obtained in the form of a product of voltage and voltage.
【００１９】電圧変動用補正回路２は電動機に供給され
る電源電圧を取り出し、電源電圧変動の１６０〜２４０
Ｖの範囲を、例えば、−１０〜＋１０Ｖの扱い易い電圧
に補正する回路である。具体的には周知の降圧トランス
を使用する。第１の基準電圧発生回路３は、過負荷検出
基準電圧Ｖfsとして、図２に示す直線Ｉ及びIIに従って
各電源電圧に対応した入力電力の電圧値（図２の右側の
縦軸）を出力する。The voltage fluctuation correction circuit 2 extracts the power supply voltage supplied to the motor, and calculates the power supply voltage fluctuation of 160 to 240.
This is a circuit for correcting the range of V to a voltage that is easy to handle, for example, -10 to + 10V. Specifically, a known step-down transformer is used. The first reference voltage generation circuit 3 outputs a voltage value of the input power (vertical axis on the right side in FIG. 2) corresponding to each power supply voltage according to the straight lines I and II shown in FIG. 2 as the overload detection reference voltage Vfs . I do.
【００２０】第１の比較回路４は電力検出回路１からの
出力される実使用の入力電力の電圧換算値Ｖ0 と、第１
の基準電圧発生回路３からの過負荷検出基準電圧Ｖfsを
比較し、電圧換算値が過負荷検出基準電圧を超えていれ
ば、この比較結果は上昇指令を停止する信号ＶS として
後述するリレー駆動に使用される。第２の基準電圧発生
回路５は、軽負荷検出基準電圧Ｖfcとして、図３に示す
直線Ｉ’及びII’に従って各電源電圧に対応した入力電
力の電圧値（図３の右側の縦軸）を出力する。The first comparison circuit 4 calculates a voltage conversion value V 0 of the actually used input power output from the power detection circuit 1,
Relay compares the overload detection reference voltage V fs from the reference voltage generating circuit 3, if the voltage conversion value exceeds the overload detection reference voltage, the comparison result is described below as a signal V S to stop the increase command Used for driving. The second reference voltage generating circuit 5 sets the voltage value of the input power corresponding to each power supply voltage according to the straight lines I ′ and II ′ shown in FIG. 3 (the vertical axis on the right side in FIG. 3) as the light load detection reference voltage Vfc . Is output.
【００２１】第２の比較回路６は電力検出回路１からの
出力される実使用の入力電力の電圧換算値Ｖ0 と、第２
の基準電圧発生回路５からの軽負荷検出基準電圧Ｖfcを
比較し、電圧換算値が軽負荷検出基準電圧を超えていれ
ば低速にし、逆のときは高速にする速度切換指令Ｖc を
後述するリレーに送出する。図５は図４構成の一実施例
回路図である。アンプＯＰ１は電圧変動用補正回路２に
含まれ、降圧した電圧の安定化を図るためのもので、入
力側のリップル電圧による雑音電圧や周囲温度の変化に
対して出来るだけ電圧を安定化させる機能を有する。従
って、アンプＯＰ１の出力はＢ点において、電源電圧の
変動に追従して正確に前述の−１０〜＋１０Ｖで変動す
るようになっている。The second comparison circuit 6 calculates a voltage conversion value V 0 of the actually used input power output from the power detection circuit 1,
Of comparing the light load detection reference voltage V fc of the reference voltage generating circuit 5, the low speed if the voltage conversion value exceeds the light load detection reference voltage, below the speed switching instruction V c to fast when the reverse And send it to the relay. FIG. 5 is a circuit diagram of one embodiment of the configuration of FIG. The amplifier OP1 is included in the voltage fluctuation correction circuit 2 and is used for stabilizing the stepped-down voltage, and a function of stabilizing the voltage as much as possible with respect to a noise voltage due to a ripple voltage on the input side and a change in ambient temperature. Having. Therefore, at the point B, the output of the amplifier OP1 fluctuates exactly in the above-mentioned -10 to +10 V following the fluctuation of the power supply voltage.
【００２２】アンプＯＰ２は第１の基準電圧発生回路３
に含まれ、過負荷検出基準電圧Ｖfsを得るためのもので
あり、その出力電流ｉs の変化を抵抗Ｒ３により電圧の
変化にして過負荷検出基準電圧Ｖfsとして出力する。入
力側の抵抗Ｒ１及びＲ２は図２に示す２本の直線Ｉ及び
IIの傾斜を決定するための抵抗である。従って、予め測
定することにより曲線ｂを得て、この曲線ｂに基づき直
線Ｉ及びIIを決定し、この直線の傾斜に従って抵抗Ｒ１
及びＲ２を一意に決定する。The amplifier OP2 includes a first reference voltage generation circuit 3
Included in, is for obtaining an overload detection reference voltage V fs, outputs in the change in the voltage change of the output current i s by resistor R3 as an overload detection reference voltage V fs. The input-side resistors R1 and R2 are two straight lines I and R2 shown in FIG.
This is the resistance to determine the slope of II. Therefore, a curve b is obtained by pre-measurement, and the straight lines I and II are determined based on the curve b.
And R2 are uniquely determined.
【００２３】一方、アンプＯＰ３は第２の基準電圧発生
回路３に含まれ、軽負荷検出基準電圧Ｖfcを得るための
ものであり、その出力電流ｉc の変化を抵抗Ｒ６により
電圧の変化にして軽負荷検出基準電圧Ｖfcとして出力す
る。上述と同様に、入力側の抵抗Ｒ４及びＲ５は図３に
示す２本の直線Ｉ’及びII’の傾斜を決定するための抵
抗である。従って、予め測定することにより曲線ｂ’を
得て、この曲線ｂ’に基づき直線Ｉ’及びII’を決定
し、この直線の傾斜に従って抵抗Ｒ４及びＲ５を一意に
決定する。On the other hand, the amplifier OP3 is included in the second reference voltage generating circuit 3 and is for obtaining the light load detection reference voltage Vfc. The change in the output current ic is changed by the resistor R6 into a voltage change. And outputs it as a light load detection reference voltage Vfc . As described above, the input-side resistors R4 and R5 are resistors for determining the slope of the two straight lines I 'and II' shown in FIG. Therefore, the curve b 'is obtained by performing the measurement in advance, the straight lines I' and II 'are determined based on the curve b', and the resistors R4 and R5 are uniquely determined according to the slope of the straight line.
【００２４】このような構成において、アンプＯＰ２の
一方の入力側のＡ点は常に０Ｖに保持されている。この
０Ｖは定格電圧２００Ｖを変動の中心として０Ｖに設定
したことによる。この場合、Ｂ点の電圧がＡ点の電圧
よりも高ければ、Ｂ点からＡ点に抵抗Ｒ１，ダイオード
Ｄ及び抵抗Ｒ２を経て電流が流れ、Ｂ点の電圧がＡ点
より低ければダイオードＤにより抵抗Ｒ１はオープン状
態となり、Ａ点からＢ点に抵抗Ｒ２のみを経て電流が流
れる。従って、アンプＯＰ２の出力電流ｉs は上記及
びに従ってリニアに変化するので、抵抗Ｒ３によりリ
ニアに変化する過負荷検出基準電圧Ｖfsを得ることがで
きる。なお、上記の場合は直線Ｉに相当し、上記の
場合は直線IIに相当することは明らかである。また、抵
抗Ｒ３は過負荷検出基準電圧Ｖfsのレベルを微調整する
ために可変抵抗になっている。In such a configuration, the point A on one input side of the amplifier OP2 is always kept at 0V. This 0V is based on the fact that the rated voltage 200V is set to 0V with the center of fluctuation. In this case, if the voltage at the point B is higher than the voltage at the point A, a current flows from the point B to the point A via the resistor R1, the diode D and the resistor R2. The resistor R1 is in an open state, and a current flows from the point A to the point B via only the resistor R2. Therefore, the output current i s of the amplifier OP2 is because changes linearly in accordance with the above and, by the resistor R3 can be obtained overload detection reference voltage V fs changes linearly. It is clear that the above case corresponds to the straight line I and the above case corresponds to the straight line II. Further, the resistor R3 is a variable resistor for finely adjusting the level of the overload detection reference voltage Vfs .
【００２５】アンプＯＰ３についても上述と全く同様の
考え方である。即ち、アンプＯＰ３の一方の入力側の
Ａ’点は常に０Ｖに保持されている。上述の及びの
ように電流が流れ、アンプＯＰ３の出力電流ｉc は上記
及びに従ってリニアに変化するので、抵抗Ｒ６によ
りリニアに変化する軽負荷検出基準電圧Ｖfcを得ること
ができる。The concept of the amplifier OP3 is exactly the same as described above. That is, the point A ′ on one input side of the amplifier OP3 is always kept at 0V. Since the current flows as described above and the output current ic of the amplifier OP3 changes linearly according to the above, the light load detection reference voltage Vfc that linearly changes can be obtained by the resistor R6.
【００２６】図６は本発明の負荷検出装置の接続図
（Ａ）と、詳細図（Ｂ）である。負荷検出装置は３相誘
導電動機Ｍの例えば、Ｔ相に直列に電流計Ａを挿入し、
Ｓ−Ｔ相間に電圧計Ｖを挿入して電流及び電圧を検出し
て前述の動作を行う。Ｍ１は上昇用リレーコイル、Ｍ２
は下降用リレーコイル、Ｍ３は高速用リレーコイル、Ｍ
４は低速用リレーコイルである。また、Ｓ１は上昇用ス
イッチ、Ｓ２は下降用スイッチ、Ｍ１ａはリレーＭ１の
ａ接点、Ｍ２ａはリレーＭ２のａ接点、Ｍ３ｂはリレー
Ｍ３のｂ接点、Ｍ４ｂはリレーＭ４のｂ接点、である。FIG. 6 is a connection diagram (A) and a detailed diagram (B) of the load detection device of the present invention. The load detector inserts an ammeter A in series with, for example, the T phase of the three-phase induction motor M,
The voltmeter V is inserted between the ST phases to detect the current and the voltage, and the above-described operation is performed. M1 is an ascending relay coil, M2
Is a descending relay coil, M3 is a high-speed relay coil, M
Reference numeral 4 denotes a low-speed relay coil. S1 is an ascending switch, S2 is a descending switch, M1a is an a contact of the relay M1, M2a is an a contact of the relay M2, M3b is a b contact of the relay M3, and M4b is a b contact of the relay M4.
【００２７】負荷検出装置は（Ｂ）に示すように、過負
荷時上昇停止用リレーＯＬ及び速度切換用リレーＨＬを
備え、過負荷時上昇停止用リレーＯＬの接点ＯＬｂは図
４に示す第１の比較回路４からの上昇停止指令Ｖｓによ
り遮断されるようになっている。リレーＯＬが遮断され
れば上昇用リレーＭ１が遮断され上昇が停止する。一
方、速度切換用リレーＨＬの接点ＨＬａ，ＨＬｂは図４
に示す第２の比較回路６からの速度切換指令Ｖc により
高速か低速の一方に切り換わるように連動になってい
る。As shown in FIG. 4B, the load detecting device includes an overload-time rise stop relay OL and a speed switching relay HL. The contact OLb of the overload-time rise stop relay OL is the first contact shown in FIG. Is shut off by the rising stop command Vs from the comparison circuit 4. If the relay OL is shut off, the ascending relay M1 is shut off and the ascent stops. On the other hand, the contacts HLa and HLb of the speed switching relay HL are shown in FIG.
It has become interlocked to switch to one of the fast or slow the speed switching instruction V c from the second comparator circuit 6 shown in.
【００２８】図７は本発明の過負荷検出装置の他の実施
例構成図で、マイクロコンピュータを使用した場合のブ
ロック図であり、図８は図７構成のテーブルの一例であ
る。まず、電力検出器により実使用の電力に比例した電
圧ＶをＡ／Ｄ変換してデジタル値を得る。また、電源電
圧を使用し易い所定電圧に降圧しＡ／Ｄ変換してデジタ
ル値を得る。テーブルＴには、図８に示すように、予め
図２に示す直線Ｉ及びIIの関係と、図３に示す直線Ｉ’
及びII' の関係に基づき、電源電圧と入力電力の電圧換
算値との関係をデジタル化して格納しておく。そして、
デジタル値による電源電圧変動が入力されると、テーブ
ルＴを参照して該当する電圧換算値のデジタル値を読出
し、この読出しデータを過負荷検出基準電圧及び軽負荷
検出基準電圧として第１及び第２の比較手段に入力す
る。第１及び第２の比較手段では電力検出回路１からの
電圧のデジタル値とテーブルからのデジタル値を比較
し、比較結果に基づき、上昇停止指令若しくは速度切換
指令を後段の各リレーに送出する。FIG. 7 is a block diagram of another embodiment of the overload detecting device according to the present invention, which is a block diagram when a microcomputer is used, and FIG. 8 is an example of a table having the structure of FIG. First, a digital value is obtained by A / D converting a voltage V proportional to the power actually used by a power detector. Further, the power supply voltage is reduced to a predetermined voltage which is easy to use, and A / D converted to obtain a digital value. As shown in FIG. 8, the table T has a relationship between the straight lines I and II shown in FIG. 2 and the straight line I ′ shown in FIG.
And the relationship between the power supply voltage and the converted voltage value of the input power is digitized and stored based on the relationship between II and II ′. And
When the power supply voltage fluctuation due to the digital value is input, the digital value of the corresponding voltage conversion value is read out with reference to the table T, and this read data is used as the first and second overload detection reference voltages and the light load detection reference voltage. To the comparison means. The first and second comparing means compares the digital value of the voltage from the power detection circuit 1 with the digital value from the table, and sends an ascending stop command or a speed switching command to each relay at the subsequent stage based on the comparison result.
【００２９】[0029]
【発明の効果】以上説明したように、本発明の負荷検出
装置によれば、電源電圧の変動に対する過負荷検出を高
い精度で行うことができ、かつ低コスト化を図ることが
でき、さらに軽負荷時における速度切換を自動的に行う
ことができる。As described above, according to the load detecting device of the present invention, overload detection for power supply voltage fluctuation can be performed with high accuracy, cost can be reduced, and the load can be further reduced. Speed switching under load can be performed automatically.
【図１】本発明の基本的概念を説明するグラフである。FIG. 1 is a graph illustrating a basic concept of the present invention.
【図２】図１の直線Ｉ，IIを具体的にしたグラフであ
る。FIG. 2 is a graph specifically illustrating straight lines I and II in FIG.
【図３】図１の直線Ｉ’，II’を具体的にしたグラフで
ある。FIG. 3 is a graph specifically illustrating the straight lines I ′ and II ′ of FIG. 1;
【図４】本発明の負荷検出装置の基本構成図である。FIG. 4 is a basic configuration diagram of a load detection device according to the present invention.
【図５】図４構成の一実施例回路図である。FIG. 5 is a circuit diagram of one embodiment of the configuration of FIG. 4;
【図６】本発明の負荷検出装置の接続図及び詳細図であ
る。FIG. 6 is a connection diagram and a detailed diagram of the load detection device of the present invention.
【図７】本発明の負荷検出装置の他の実施例構成図であ
る。FIG. 7 is a configuration diagram of another embodiment of the load detection device of the present invention.
【図８】図７構成のテーブルの一例8 is an example of a table having the configuration shown in FIG. 7;
【図９】従来の過負荷検出装置における過負荷検出の概
念を説明するグラフである。FIG. 9 is a graph illustrating the concept of overload detection in a conventional overload detection device.
【図１０】直線近似を説明するグラフである。FIG. 10 is a graph illustrating linear approximation.
１…電力検出回路 ２…電圧変動用補正回路 ３…第１の基準電圧発生回路 ４…第１の比較回路 ５…第２の基準電圧発生回路 ６…第２の比較回路 Ｖfs…過負荷検出基準電圧 Ｖfc…軽負荷検出基準電圧 ＶS …上昇停止指令 Ｖc …速度切換指令DESCRIPTION OF SYMBOLS 1 ... Power detection circuit 2 ... Voltage fluctuation correction circuit 3 ... 1st reference voltage generation circuit 4 ... 1st comparison circuit 5 ... 2nd reference voltage generation circuit 6 ... 2nd comparison circuit Vfs ... Overload detection reference voltage V fc ... light load detection reference voltage V S ... raised stop command V c ... speed changing command
フロントページの続き (56)参考文献 特開 昭58−207297（ＪＰ，Ａ) 特開 平１−278225（ＪＰ，Ａ) 実開 昭51−74966（ＪＰ，Ｕ) 実開 昭60−72488（ＪＰ，Ｕ) 実開 昭62−26849（ＪＰ，Ｕ)Continuation of the front page (56) References JP-A-58-207297 (JP, A) JP-A-1-278225 (JP, A) JP-A-51-74966 (JP, U) JP-A-60-72488 (JP, A) , U) Japanese Utility Model Showa 62-26849 (JP, U)
Claims (9)
定して負荷を検出する電力測定式負荷検出装置におい
て、 該入力電力を測定し該入力電力に比例した換算電圧（Ｖ
O ）を送出する電力変換手段（１）と、 該巻上電動機に供給する電源電圧の変動を検出し、該変
動を所定レベルに補正する電圧変動補正手段（２）と、 該補正された電圧変動を入力し、該電源電圧の変動に対
応した過負荷検出設定曲線に直線近似した少なくとも２
本の直線を設定する各素子（Ｒ1 ，Ｒ2 ）の値を決定
し、該電圧の変動に対応して変化する電流値を過負荷検
出基準電圧（Ｖfs) として発生する第１の基準電圧発生
手段（３）と、 該換算電圧（ＶO ）と該過負荷検出基準電圧（Ｖfs) と
を比較し、該換算電圧が該過負荷検出基準電圧（Ｖfs)
を超えているとき、該巻上電動機の上昇停止指令
（ＶS ）を発生する第１の比較手段（４）と、 を具備することを特徴とする電力測定式負荷検出装置。1. A power measuring type load detecting device for detecting a load by measuring an input power (W) of a hoisting motor (M), wherein the input power is measured and a converted voltage (V) proportional to the input power is measured.
O ), a voltage change correcting means (2) for detecting a change in the power supply voltage supplied to the hoist motor and correcting the change to a predetermined level, Input a fluctuation, and at least two linear approximations to an overload detection setting curve corresponding to the fluctuation of the power supply voltage.
A value of each element (R 1 , R 2 ) for setting this straight line is determined, and a first reference value for generating a current value that changes in response to the fluctuation of the voltage as an overload detection reference voltage (V fs ) Voltage generating means (3), comparing the converted voltage (V O ) with the overload detection reference voltage (V fs ), and comparing the converted voltage with the overload detection reference voltage (V fs );
And a first comparing means (4) for generating a lifting stop command (V S ) for the hoisting motor when the value exceeds the following.
定して負荷を検出する電力測定式負荷検出装置におい
て、 該入力電力を測定し該入力電力に比例した換算電圧（Ｖ
O ）を送出する電力変換手段（１）と、 該巻上電動機に供給する電源電圧の変動を検出し、該変
動を所定レベルに補正する電圧変動補正手段（２）と、 該補正された電圧変動を入力し、該電源電圧の変動に対
応した軽負荷検出設定曲線に直線近似した少なくとも２
本の直線を設定する各素子（Ｒ4 ，Ｒ5 ）の値を決定
し、該電圧の変動に対応して変化する電流値を速度切換
基準電圧（Ｖfc)として発生する第２の基準電圧発生手
段（５）と、 該換算電圧（ＶO ）と該速度切換基準電圧（Ｖfc) とを
比較し、該換算電圧が該速度切換基準電圧（Ｖfc) を超
えているときは低速に、逆のときは高速にするように、
該巻上電動機の高速／低速切換を行う速度切換指令（Ｖ
c ）を発生する第２の比較手段（６）と、 を具備することを特徴とする電力測定式負荷検出装置。2. A power-measuring load detecting device for measuring a load by measuring an input power (W) of a hoisting motor (M), wherein the converted voltage (V) is measured in proportion to the input power.
O ), a voltage change correcting means (2) for detecting a change in the power supply voltage supplied to the hoist motor and correcting the change to a predetermined level, At least 2 which is linearly approximated to a light load detection setting curve corresponding to the power supply voltage fluctuation.
The value of each element (R 4 , R 5 ) that sets this straight line is determined, and a second reference voltage that generates a current value that changes in response to the voltage change as a speed switching reference voltage (V fc ) and generating means (5), compares the said conversion voltage (V O) and the velocity switching reference voltage (V fc), to a low speed when the converted voltage exceeds the said speed switching reference voltage (V fc) And vice versa,
A speed switching command (V) for performing high speed / low speed switching of the hoisting motor.
c ) a second comparing means (6) for generating the power measuring load detecting device.
定して負荷を検出する電力測定式負荷検出装置におい
て、 該入力電力を測定し該入力電力に比例した換算電圧（Ｖ
O ）を送出する電力変換手段（１）と、 該巻上電動機に供給する電源電圧の変動を検出し、該変
動を所定レベルに補正する電圧変動補正手段（２）と、 該補正された電圧変動を入力し、該電源電圧の変動に対
応した過負荷検出設定曲線に直線近似した少なくとも２
本の直線を設定する各素子（Ｒ1 ，Ｒ2 ）の値を決定
し、該電圧の変動に対応して変化する電流値を過負荷検
出基準電圧（Ｖfs) として発生する第１の基準電圧発生
手段（３）と、 該換算電圧（ＶO ）と該過負荷検出基準電圧（Ｖfs) と
を比較し、該換算電圧が該過負荷検出基準電圧（Ｖfs)
を超えているとき、該巻上電動機の上昇停止指令
（ＶS ）を発生する第１の比較手段（４）と、 該補正された電圧変動を入力し、該電源電圧の変動に対
応した軽負荷検出設定曲線に直線近似した少なくとも２
本の直線を設定する各素子（Ｒ4 ，Ｒ5 ）の値を決定
し、該電圧の変動に対応して変化する電流値を速度切換
基準電圧（Ｖfc)として発生する第２の基準電圧発生手
段（５）と、 該換算電圧（ＶO ）と該速度切換基準電圧（Ｖfc) とを
比較し、該換算電圧が該速度切換基準電圧（Ｖfc) を超
えているときは低速に、逆のときは高速にするように、
該巻上電動機の高速／低速切換を行う速度切換指令（Ｖ
c ）を発生する第２の比較手段（６）と、 を具備することを特徴とする電力測定式負荷検出装置。3. A power-measuring load detecting device for measuring a load by measuring an input power (W) of a hoisting motor (M), wherein the converted power (V) is measured in proportion to the input power by measuring the input power.
O ), a voltage change correcting means (2) for detecting a change in the power supply voltage supplied to the hoist motor and correcting the change to a predetermined level, Input a fluctuation, and at least two linear approximations to an overload detection setting curve corresponding to the fluctuation of the power supply voltage.
A value of each element (R 1 , R 2 ) for setting this straight line is determined, and a first reference value for generating a current value that changes in response to the fluctuation of the voltage as an overload detection reference voltage (V fs ) Voltage generating means (3), comparing the converted voltage (V O ) with the overload detection reference voltage (V fs ), and comparing the converted voltage with the overload detection reference voltage (V fs );
The first comparison means (4) for generating a lifting stop command (V S ) for the hoisting motor, and inputting the corrected voltage fluctuation, and outputting a light voltage corresponding to the fluctuation of the power supply voltage. At least 2 which is linearly approximated to the load detection setting curve
The value of each element (R 4 , R 5 ) that sets this straight line is determined, and a second reference voltage that generates a current value that changes in response to the voltage change as a speed switching reference voltage (V fc ) and generating means (5), compares the said conversion voltage (V O) and the velocity switching reference voltage (V fc), to a low speed when the converted voltage exceeds the said speed switching reference voltage (V fc) And vice versa,
A speed switching command (V) for performing high speed / low speed switching of the hoisting motor.
c ) a second comparing means (6) for generating the power measuring load detecting device.
（ＯＰ２）を備え、その一方の入力側の電圧を、該電源
電圧の定格電圧を基準とする一定電圧に設定し、該一定
電圧を中心として変動する補正電源電圧に対応して各素
子（Ｒ1 ，Ｒ 2 ）に流れる電流の変化に基づき、該オペ
アンプの出力電流（ｉs ）が変化し、出力側の抵抗（Ｒ
3 ）に流れる該出力電流から該過負荷検出基準電圧（Ｖ
fs) を得るようにした請求項１又は３に記載の負荷検出
装置。4. The operational amplifier according to claim 1, wherein said first reference voltage generating means is an operational amplifier.
(OP2), and the voltage on one input side is supplied to the power supply
Set to a constant voltage based on the rated voltage of the voltage, and
Each element corresponds to the corrected power supply voltage that fluctuates around the voltage.
Child (R1, R Two) Based on the change in the current flowing through
The output current of the amplifier (is) Changes, and the resistance (R
Three) From the output current flowing to the overload detection reference voltage (V
fsThe load detection according to claim 1 or 3, wherein
apparatus.
（ＯＰ３）を備え、その一方の入力側の電圧を、該電源
電圧の定格電圧を基準とする一定電圧に設定し、該一定
電圧を中心として変動する補正電源電圧に対応して各素
子（Ｒ4 ，Ｒ 5 ）に流れる電流の変化に基づき、該オペ
アンプの出力電流（ｉc ）が変化し、出力側の抵抗（Ｒ
6 ）に流れる該出力電流から該軽負荷検出基準電圧（Ｖ
fc) を得るようにした請求項２又は３に記載の負荷検出
装置。5. The operational amplifier according to claim 2, wherein said second reference voltage generating means is an operational amplifier.
(OP3), and the voltage on one input side is supplied to the power supply
Set to a constant voltage based on the rated voltage of the voltage, and
Each element corresponds to the corrected power supply voltage that fluctuates around the voltage.
Child (RFour, R Five) Based on the change in the current flowing through
The output current of the amplifier (ic) Changes, and the resistance (R
6) From the output current flowing through the light load detection reference voltage (V
fcThe load detection according to claim 2 or 3, wherein
apparatus.
定して負荷を検出する電力測定式負荷検出装置におい
て、 該負荷検出装置は、 該入力電力を測定し該入力電力に比例した換算電圧（Ｖ
O ）をデジタル値として送出する電力変換手段（１）
と、 該巻上電動機に供給する電源電圧の変動を検出し、該変
動を所定レベルに補正しデジタル値として送出する電圧
変動補正手段（２）と、 該換算電圧及び電源電圧変動に基づき、過負荷検出時に
は上昇停止指令を発生し、軽負荷検出時には速度切換指
令を発生するマイクロコンピュータを備え、 該マイクロコンピュータは、さらに、 電源電圧の変動に対応した過負荷検出設定曲線に直線近
似した少なくとも２本の直線から設定された過負荷検出
基準電圧を格納し、さらに電源電圧の変動に対応した軽
負荷検出設定曲線に直線近似した少なくとも２本の直線
から設定された軽負荷検出基準電圧を格納するテーブル
（Ｔ）と、 補正変動電圧のデジタル値から該テーブルを参照して該
過負荷検出基準電圧のデジタル値を読出し、該換算電圧
のデジタル値と該過負荷検出基準電圧のデジタル値とを
比較し、該換算電圧が過負荷検出基準電圧を超えている
とき、該巻上電動機の上昇停止指令（ＶS ）を発生する
第１の比較手段と、 を具備することを特徴とする電力測定式負荷検出装置。6. A power-measuring load detecting device for detecting a load by measuring an input power (W) of a hoisting motor (M), wherein the load detecting device measures the input power and is proportional to the input power. Converted voltage (V
Power conversion means (1) for transmitting O ) as a digital value
Voltage fluctuation correction means (2) for detecting a change in the power supply voltage supplied to the hoisting motor, correcting the change to a predetermined level, and transmitting the digital value as a digital value; A microcomputer for generating an ascending / stopping command when a load is detected and a speed switching command when a light load is detected, the microcomputer further comprising at least two lines which are linearly approximated to an overload detection setting curve corresponding to a change in power supply voltage; An overload detection reference voltage set from the two straight lines is stored, and a light load detection reference voltage set from at least two straight lines that are linearly approximated to a light load detection setting curve corresponding to the fluctuation of the power supply voltage is stored. A digital value of the overload detection reference voltage is read out by referring to the table from the table (T) and the digital value of the correction fluctuation voltage, Comparing the digital value of the digital value and該過load detection reference voltage, when said conversion voltage exceeds the overload detection reference voltage, raised stop command the winding on the motor (V S) the first for generating a A power measurement type load detection device, comprising: comparison means.
定して負荷を検出する電力測定式負荷検出装置におい
て、 該負荷検出装置は、 該入力電力を測定し該入力電力に比例した換算電圧（Ｖ
O ）をデジタル値として送出する電力変換手段（１）
と、 該巻上電動機に供給する電源電圧の変動を検出し、該変
動を所定レベルに補正しデジタル値として送出する電圧
変動補正手段（２）と、 該換算電圧及び電源電圧変動に基づき、過負荷検出時に
は上昇停止指令を発生し、軽負荷検出時には速度切換指
令を発生するマイクロコンピュータを備え、 該マイクロコンピュータは、さらに、 電源電圧の変動に対応した過負荷検出設定曲線に直線近
似した少なくとも２本の直線から設定された過負荷検出
基準電圧を格納し、さらに電源電圧の変動に対応した軽
負荷検出設定曲線に直線近似した少なくとも２本の直線
から設定された軽負荷検出基準電圧を格納するテーブル
（Ｔ）と、 補正変動電圧のデジタル値から該テーブルを参照して該
軽負荷検出基準電圧のデジタル値を読出し、該換算電圧
が該軽負荷検出基準電圧を超えているときは低速に、逆
のときは高速にするように、該巻上電動機の速度切換指
令（Ｖc ）を発生する第２の比較手段と、 を具備することを特徴とする電力測定式負荷検出装置。7. A power measuring type load detecting device for detecting a load by measuring an input power (W) of a hoisting motor (M), wherein the load detecting device measures the input power and is proportional to the input power. Converted voltage (V
Power conversion means (1) for transmitting O ) as a digital value
Voltage fluctuation correction means (2) for detecting a change in the power supply voltage supplied to the hoisting motor, correcting the change to a predetermined level, and transmitting the digital value as a digital value; A microcomputer for generating an ascending / stopping command when a load is detected and a speed switching command when a light load is detected, the microcomputer further comprising at least two lines which are linearly approximated to an overload detection setting curve corresponding to a change in power supply voltage; An overload detection reference voltage set from the two straight lines is stored, and a light load detection reference voltage set from at least two straight lines that are linearly approximated to a light load detection setting curve corresponding to the fluctuation of the power supply voltage is stored. The digital value of the light load detection reference voltage is read out by referring to the table from the table (T) and the digital value of the correction fluctuation voltage, and the converted voltage is Low speed when it exceeds the light load detection reference voltage, so that when the reverse is fast, it comprises a second comparator means for generating the speed switching instruction take-on the electric motor (V c), the A power measurement type load detection device characterized by the above-mentioned.
定して負荷を検出する電力測定式負荷検出装置におい
て、 該負荷検出装置は、 該入力電力を測定し該入力電力に比例した換算電圧（Ｖ
O ）をデジタル値として送出する電力変換手段（１）
と、 該巻上電動機に供給する電源電圧の変動を検出し、該変
動を所定レベルに補正しデジタル値として送出する電圧
変動補正手段（２）と、 該換算電圧及び電源電圧変動に基づき、過負荷検出時に
は上昇停止指令を発生し、軽負荷検出時には速度切換指
令を発生するマイクロコンピュータを備え、 該マイクロコンピュータは、さらに、 電源電圧の変動に対応した過負荷検出設定曲線に直線近
似した少なくとも２本の直線から設定された過負荷検出
基準電圧を格納し、さらに電源電圧の変動に対応した軽
負荷検出設定曲線に直線近似した少なくとも２本の直線
から設定された軽負荷検出基準電圧を格納するテーブル
（Ｔ）と、 補正変動電圧のデジタル値から該テーブルを参照して該
過負荷検出基準電圧のデジタル値を読出し、該換算電圧
のデジタル値と該過負荷検出基準電圧のデジタル値とを
比較し、該換算電圧が過負荷検出基準電圧を超えている
とき、該巻上電動機の上昇停止指令（ＶS ）を発生する
第１の比較手段と、 補正変動電圧のデジタル値から該テーブルを参照して該
軽負荷検出基準電圧のデジタル値を読出し、該換算電圧
が該軽負荷検出基準電圧を超えているときは低速に、逆
のときは高速にするように、該巻上電動機の速度切換指
令（Ｖc ）を発生する第２の比較手段と、 を具備することを特徴とする電力測定式負荷検出装置。8. A power-measuring load detection device for detecting a load by measuring an input power (W) of a hoisting motor (M), wherein the load detection device measures the input power and is proportional to the input power. Converted voltage (V
Power conversion means (1) for transmitting O ) as a digital value
Voltage fluctuation correction means (2) for detecting a change in the power supply voltage supplied to the hoisting motor, correcting the change to a predetermined level, and transmitting the digital value as a digital value; A microcomputer for generating an ascending / stopping command when a load is detected and a speed switching command when a light load is detected, the microcomputer further comprising at least two lines which are linearly approximated to an overload detection setting curve corresponding to a change in power supply voltage; An overload detection reference voltage set from the two straight lines is stored, and a light load detection reference voltage set from at least two straight lines that are linearly approximated to a light load detection setting curve corresponding to the fluctuation of the power supply voltage is stored. A digital value of the overload detection reference voltage is read out by referring to the table from the table (T) and the digital value of the correction fluctuation voltage, Comparing the digital value of the digital value and該過load detection reference voltage, when said conversion voltage exceeds the overload detection reference voltage, raised stop command the winding on the motor (V S) the first for generating a Comparing means for reading the digital value of the light load detection reference voltage with reference to the table from the digital value of the correction fluctuation voltage, and when the converted voltage exceeds the light load detection reference voltage, at a low speed, and vice versa. And a second comparing means for generating a speed switching command (V c ) for the hoist motor so as to increase the speed at times.
より行う請求項２、３、７又は８に記載の負荷検出装
置。9. The load detecting device according to claim 2, wherein the speed switching is performed by converting the number of poles of the hoisting motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4107737A JP2593270B2 (en) | 1992-04-27 | 1992-04-27 | Power measurement type load detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4107737A JP2593270B2 (en) | 1992-04-27 | 1992-04-27 | Power measurement type load detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05301697A JPH05301697A (en) | 1993-11-16 |
| JP2593270B2 true JP2593270B2 (en) | 1997-03-26 |
Family
ID=14466680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4107737A Expired - Fee Related JP2593270B2 (en) | 1992-04-27 | 1992-04-27 | Power measurement type load detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2593270B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020101033A1 (en) * | 2018-11-16 | 2020-05-22 | 株式会社キトー | Method for assessing overload of wound electric motor, and method for manufacturing winder |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2706561C (en) | 2007-11-26 | 2016-07-19 | Safeworks, Llc | Power sensor |
| CN101691189A (en) * | 2009-10-13 | 2010-04-07 | 天津天安起重电器有限公司 | Method for detecting overload crane by detecting power |
| CN108007639B (en) * | 2016-10-31 | 2020-07-17 | 上海广茂达光艺科技股份有限公司 | Pressure data processing method and system |
-
1992
- 1992-04-27 JP JP4107737A patent/JP2593270B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020101033A1 (en) * | 2018-11-16 | 2020-05-22 | 株式会社キトー | Method for assessing overload of wound electric motor, and method for manufacturing winder |
| JPWO2020101033A1 (en) * | 2018-11-16 | 2021-10-14 | 株式会社キトー | Hoisting motor overload determination method and hoisting machine manufacturing method |
| JP7253307B2 (en) | 2018-11-16 | 2023-04-06 | 株式会社キトー | Overload determination method for hoisting motor and method for manufacturing hoisting machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05301697A (en) | 1993-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201072858Y (en) | Induction motor control system and induction motor system | |
| CN1992499B (en) | Apparatus and method for detecting phase currents of inverter | |
| US7898210B2 (en) | To obtain the three-phase current via adjusting width of pulses with single DC-link current sensor | |
| US6556458B2 (en) | Inverter device with improved current detector | |
| JPH09304489A (en) | Method for measuring motor constant of induction motor | |
| EP2444817A2 (en) | Current detection circuit for a power semiconductor device | |
| US5450268A (en) | Method and apparatus for RMS current approximation | |
| JPH0819263A (en) | Output current detector of pwm inverter | |
| JP2593270B2 (en) | Power measurement type load detector | |
| KR0134984B1 (en) | Motor control apparatus | |
| CN103078520A (en) | Frequency converter device and over-current protection method thereof | |
| CN212301845U (en) | Charging pile error calibrating device | |
| Matsuo et al. | Field oriented control of induction machines employing rotor end ring current detection | |
| JPH05184157A (en) | Output voltage error correcting unit for invert | |
| CN101170282A (en) | Inverter current detecotr | |
| KR870000560B1 (en) | Travelling speed control of elevator | |
| JPH0219718B2 (en) | ||
| CN108809198A (en) | For the method for pressure inverter in control and it include the middle system for pressing inverter | |
| JPS583571A (en) | Current detecting circuit | |
| KR0182195B1 (en) | Inverter output voltage measuring method | |
| JPH0357717B2 (en) | ||
| JPH07264869A (en) | Inverter and current change detecting device for inverter | |
| KR19990070100A (en) | Inverter current control device | |
| JPH0568957B2 (en) | ||
| JP2000102289A (en) | Voltage controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081219 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091219 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101219 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111219 Year of fee payment: 15 |
|
| LAPS | Cancellation because of no payment of annual fees |