JPH0652205B2 - Load fluctuation detection method and device - Google Patents
Load fluctuation detection method and deviceInfo
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- JPH0652205B2 JPH0652205B2 JP61083141A JP8314186A JPH0652205B2 JP H0652205 B2 JPH0652205 B2 JP H0652205B2 JP 61083141 A JP61083141 A JP 61083141A JP 8314186 A JP8314186 A JP 8314186A JP H0652205 B2 JPH0652205 B2 JP H0652205B2
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、故障予知手段に関する。特に、無人化運転が
行われ交流電気機器で駆動される機械設備の予防保守手
段に関する。ここで、交流電気機器とは、交流電動機お
よびソレノイドなどをいう。The present invention relates to failure prediction means. In particular, it relates to preventive maintenance means for mechanical equipment that is operated by unmanned operation and is driven by AC electric equipment. Here, the AC electric equipment refers to an AC electric motor, a solenoid, and the like.
交流電気機器で駆動される機械の異常を検出する方法と
して、 振動検出器を用いる方法、 音検出器を用いる方法、 回転各所の温度を計測する方法、 ひずみ検出器を用いる方法（電気学会誌99巻３号16
頁〜18頁）、 などがあり、また、工作機械の切削工具の異常検出に
は、 アコースティック・エミッションを用いる方法（日
本自動制御協会第29回システムと制御研究発表講演会Ｂ
18、ＡＥによる工具折損検出）などがある。Vibration detectors, sound detectors, temperature measurement at various rotating locations, strain detectors (methods of the Institute of Electrical Engineers of Japan 99 Volume 3 Number 16
Page 18), etc., and a method using acoustic emission for detecting abnormalities in cutting tools of machine tools (The 29th Japan Automatic Control Association System and Control Research Presentation Lecture B)
18, tool breakage detection by AE).
このような従来例方法で検出手段を実現すると、 検出器が高価である、 検出器を被測定部位の近傍に設置する必要がある
が、設置場所の環境によっては設置が不可能な場合があ
る、 検出器からの大量の信号の処理に先立って信号の蓄
積が必要な場合があり、検出の即時性を得るために高価
な高速演算装置を必要とすることがある、 などの欠点がある。If the detection means is realized by such a conventional method, the detector is expensive.It is necessary to install the detector in the vicinity of the measurement site, but it may not be possible depending on the environment of the installation location. However, there are drawbacks such as the fact that signal accumulation may be necessary before processing a large amount of signals from the detector, and an expensive high-speed arithmetic device may be required to obtain immediacy of detection.
本発明は、このような欠点を除去するもので、安価な手
段で測定が可能であり、また、検出器が被測定部位近傍
の環境に影響されない異常検出方法および装置を提供す
ることを目的とする。An object of the present invention is to eliminate such drawbacks and to provide an anomaly detection method and apparatus which can be measured by an inexpensive means and in which the detector is not affected by the environment in the vicinity of the measurement site. To do.
本発明は、機械装置を駆動する交流電気機器の電気入力
値を測定し、この測定値に基づいてこの機械装置の負荷
変動を検出する方法において、 上記機械装置の基準使用状態時の上記測定値から外乱要
因に基づく周期的波形を抽出し、上記機械装置の負荷使
用時の上記測定値から上記外乱要因に基づく周期的波形
部分を除去することを特徴とする。The present invention is a method for measuring an electric input value of an AC electric device for driving a mechanical device and detecting a load fluctuation of the mechanical device based on the measured value, wherein the measured value in a standard use state of the mechanical device. The periodic waveform based on the disturbance factor is extracted from the above, and the periodic waveform portion based on the disturbance factor is removed from the measured value when the load of the mechanical device is used.
機械装置を駆動する交流電気機器の電気入力値を測定
し、この測定値に基づいてこの機械装置の負荷変動を検
出する方法において、上記機械装置の基準使用状態時の
上記測定値から外乱要因に基づく周期的波形を抽出し、
上記機械装置の負荷使用時の上記測定値のサンプル値を
所定期間にわたり記憶し、この記憶されたサンプル値に
演算処理を行い、上記基準使用時の外乱要因に基づく周
期的波形を上記負荷使用時の上記測定値のサンプル値か
らほぼ消去する統計処理演算を実行することを特徴とす
る。In a method of measuring an electric input value of an AC electric device that drives a mechanical device, and detecting a load fluctuation of the mechanical device based on the measured value, a disturbance factor from the measured value in the standard use state of the mechanical device Extract a periodic waveform based on
A sample value of the measured value when the load of the mechanical device is used is stored for a predetermined period, arithmetic processing is performed on the stored sample value, and a periodic waveform based on a disturbance factor when the reference is used is used when the load is used. It is characterized in that the statistical processing operation is executed so as to almost eliminate from the sampled value of the above measurement value.
機械装置を駆動する交流電気機器の電気入力値を測定す
る測定手段と、この測定手段の出力に基づいてこの機械
装置の負荷変動を検出する検出手段とを備えた負荷変動
の検出装置において、上記測定回路は、上記交流電気機
器への印加電圧にかかわる第一検出値を生成する第一検
出手段と、上記交流電気機器の供給電流にかかわる第二
検出値を生成する第二検出手段と、インピーダンスの調
整により、上記第一検出値と上記第二検出値のそれぞれ
の振幅および位相の差異を調整する回路素子と、上記第
一検出値と上記第二検出値との差の信号を生成する回路
手段と、この回路手段の出力を統計処理する演算手段と
を備えたことを特徴とする。A load fluctuation detecting device comprising: a measuring unit that measures an electric input value of an alternating-current electric device that drives a mechanical device; and a detecting unit that detects a load fluctuation of the mechanical device based on an output of the measuring unit. The measurement circuit, a first detection means for generating a first detection value related to the voltage applied to the AC electric equipment, a second detection means for generating a second detection value related to the supply current of the AC electric equipment, impedance Circuit element for adjusting the difference between the amplitude and the phase of each of the first detection value and the second detection value, and a circuit for generating a signal of the difference between the first detection value and the second detection value. Means and a calculation means for statistically processing the output of the circuit means.
電気入力が単相交流であり、第一検出手段には、その出
力回路に可変容量を含むことが好ましい。It is preferable that the electric input is a single-phase alternating current and the output circuit of the first detection means includes a variable capacitance.
また、電気入力が三相交流であり、第二検出手段には、
その入力回路の中性点に可変抵抗器が接続されることが
好ましい。Further, the electric input is a three-phase alternating current, and the second detection means,
A variable resistor is preferably connected to the neutral point of the input circuit.
また、演算手段はマイクロプロセッサを含むことが好ま
しい。Moreover, it is preferable that the arithmetic means includes a microprocessor.
第９図は本発明の原理を説明する交流電気機器の等価回
路である。図でこの交流電気機器の負荷の変動は、この
軸負荷に相応の値を有する抵抗Ｒおよびインダクタンス
Ｌの変動に等価であり、印加される端子電圧の電圧値を
ｅとし、また負荷電流の電流値ｉとすれば、 で示される。FIG. 9 is an equivalent circuit of an AC electric device for explaining the principle of the present invention. In the figure, the variation of the load of this AC electric device is equivalent to the variation of the resistance R and the inductance L having values corresponding to this axial load, the voltage value of the applied terminal voltage is e, and the current of the load current is If the value i is Indicated by.
上式で示すように負荷電流ｉは負荷の変動によりその振
幅および位相が変化する。As shown in the above equation, the load current i changes in amplitude and phase due to load fluctuation.
この負荷電流の波形観測結果の一例として、ボール盤の
軸を駆動する電動機に供給される電流波形を第10図およ
び第11図に示す。第10図は無負荷時の波形を示し、第11
図は微少負荷時の波形を示すが、信号波形の相違は僅か
であり、雑音などの影響で相異の検出は困難である。As an example of the result of waveform observation of this load current, the current waveform supplied to the electric motor driving the shaft of the drilling machine is shown in FIGS. 10 and 11. Fig. 10 shows the waveform when there is no load.
The figure shows the waveform when the load is very small, but the difference in the signal waveform is slight, and it is difficult to detect the difference due to the influence of noise and the like.
本発明は、基準時を無負荷時または正常負荷時のいずれ
かに設定し、この基準時の負荷電流波形と負荷変動時の
電流波形との振幅差および位相差の両者を含んだ信号を
検出することにより、負荷の変動を感度よく検出しよう
とするものである。The present invention sets the reference time to either no load or normal load, and detects a signal including both an amplitude difference and a phase difference between the load current waveform at the reference time and the current waveform at the time of load fluctuation. By doing so, the load fluctuation is detected with high sensitivity.
さらに本発明では、負荷の正常時でも負荷の内部または
負荷にかかわる外部の構造物の存在でリップル状の波形
を外乱として含む場合があり、負荷変動にかかわる信号
以外の外乱信号を統計的処理を施して除去するものであ
る。Further, in the present invention, even when the load is normal, the ripple-shaped waveform may be included as a disturbance due to the presence of an internal structure related to the load or an external structure related to the load, and a disturbance signal other than the signal related to the load fluctuation is statistically processed. It is applied and removed.
以下、本発明実施例装置を図面に基づいて説明する。 An apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
第１図はこの実施例装置の構成を示すブロック構成図で
ある。第２図および第３図は第１図に示す検出回路の構
成を示す回路接続図である。FIG. 1 is a block diagram showing the configuration of the apparatus of this embodiment. 2 and 3 are circuit connection diagrams showing the configuration of the detection circuit shown in FIG.
まず、第１図に基づいて実施例装置の構成を説明する。
この実施例装置は、電源１および被検出器であるボール
盤の軸を駆動する電動機２に接続された検出回路３と、
検出回路３のアナログ信号をディジタル信号に変換する
アナログ・ディジタル変換器４と、このアナログ・ディ
ジタル変換器４の出力に接続された演算回路５と、この
演算回路５の出力に接続された出力プリンタ６および判
定回路７とを備える。ここで、第２図は電源が単相交流
である検出回路の構成を示し、第３図は電源が三相交流
である検出回路の構成を示す。この回路は、電源１の相
間電圧にかかわる電圧が一次巻線に印加される電圧変成
器ＰＴと、電動機２への供給電流が一次巻線を通過する
変流器ＣＴと、電圧変成器ＰＴで変成された信号にかか
わる第一信号Ｅ1、変流器ＣＴで変成された信号にかか
わる第二信号Ｅ2との差信号Ｅを出力する検出信号端子
ｄ1およびａ2と、基準時に観測される第一信号の波形お
よび第二信号の波形がその振幅および位相で可及的に一
致するように設定する可変抵抗器ＶＲ、ＶＲ1、および
ＶＲ2と可変コンデンサＣとを含む。ここで、可変抵抗
器ＶＲおよび可変コンデンサＣは位相調整に用いられ、
可変抵抗器ＶＲ1およびＶＲ2は振幅調整に用いられる。First, the configuration of the embodiment apparatus will be described with reference to FIG.
The apparatus of this embodiment includes a detection circuit 3 connected to a power source 1 and an electric motor 2 that drives a shaft of a drilling machine, which is a device to be detected.
An analog / digital converter 4 for converting an analog signal of the detection circuit 3 into a digital signal, an arithmetic circuit 5 connected to the output of the analog / digital converter 4, and an output printer connected to the output of the arithmetic circuit 5. 6 and the determination circuit 7. Here, FIG. 2 shows the configuration of the detection circuit in which the power source is a single-phase alternating current, and FIG. 3 shows the configuration of the detection circuit in which the power source is a three-phase alternating current. This circuit includes a voltage transformer PT in which a voltage related to the interphase voltage of the power source 1 is applied to the primary winding, a current transformer CT in which a current supplied to the electric motor 2 passes through the primary winding, and a voltage transformer PT. The detection signal terminals d 1 and a 2 which output a difference signal E between the first signal E 1 related to the transformed signal and the second signal E 2 related to the transformed signal in the current transformer CT, and the detection signal terminals d 1 and a 2 which are observed at the reference time. The variable resistors VR, VR 1 and VR 2 and the variable capacitor C are set so that the waveform of the first signal and the waveform of the second signal are matched in amplitude and phase as much as possible. Here, the variable resistor VR and the variable capacitor C are used for phase adjustment,
Variable resistors VR 1 and VR 2 are used for amplitude adjustment.
次に、この実施例装置の動作について説明する。Next, the operation of the apparatus of this embodiment will be described.
ここで一例として、被検出現象はボール盤のドリルの刃
先の摩耗状態である。通常、この摩耗の進行に伴ってボ
ール盤の駆動軸動力は増加し、これが駆動電動機の負荷
電流の増加を招来する。Here, as an example, the phenomenon to be detected is the worn state of the cutting edge of the drill of the drilling machine. Usually, the drive shaft power of the drilling machine increases with the progress of this wear, which causes an increase in the load current of the drive motor.
さて、この実施例では、無負荷時を基準時とし、このと
きに検出信号端子ｄ1およびｄ2を通過する検出信号Ｅの
波形を第４図に示し、正常な刃先のドリルで穿孔加工し
たときの検出信号を第５図に示し、また、使用回数が増
加し切削能力が劣化した刃先のドリルで加工したときの
検出信号を第６図に示す。Now, in this embodiment, with no load as the reference time, the waveform of the detection signal E passing through the detection signal terminals d 1 and d 2 at this time is shown in FIG. FIG. 5 shows the detection signal at this time, and FIG. 6 shows the detection signal at the time of machining with a drill having a cutting edge whose number of times of use has increased and cutting ability has deteriorated.
ここで、基準時には本来検出信号端子ｄ1およびｄ2に検
出信号が現れないように検出回路３の回路素子の値が設
定されるが、第４図に示すようにリップル状の波形が残
存する。これは、ボール盤軸を駆動するＶベルトなどに
関与している外乱要因によるものである。この種の外乱
要因の検出結果に対する影響の除去は演算回路５で行わ
れる。Here, the values of the circuit elements of the detection circuit 3 are set so that the detection signals do not originally appear at the detection signal terminals d 1 and d 2 at the time of reference, but a ripple-like waveform remains as shown in FIG. . This is due to disturbance factors related to the V-belt and the like that drive the drilling machine shaft. The arithmetic circuit 5 removes the influence of this type of disturbance factor on the detection result.
ここで、まず、演算回路５で行う外乱要因の除去の演算
処理のために、基準状態でのリップル状の波形の周期を
求めておく。Here, first, the period of the ripple-like waveform in the reference state is obtained for the calculation process of removing the disturbance factor performed by the calculation circuit 5.
本実施例の場合、第４図によりそのリップルの周期は0.
1sec程度であり、その周期は基準状態でシンクロスコー
プやスペクトルアナライザ等で観測すれば容易に求める
ことができる。In the case of this embodiment, the ripple cycle is 0 according to FIG.
It is about 1 second, and the period can be easily obtained by observing with a synchroscope or spectrum analyzer in the standard state.
次にこのリップルの周期がわかったところで、負荷のあ
る実使用時のリップルの除去処理が行われる。Next, when the period of this ripple is known, the ripple removal process during actual use with a load is performed.
Ａ／Ｄ変換された波形から、各周期の極値（例えば最大
値）をサンプリングする。この極値は演算回路によって
増加から減少に転じた時点をその周期の極値とすれば、
その時点（減少の直前）の値をサンプリングすればよ
い。An extreme value (for example, maximum value) of each cycle is sampled from the A / D converted waveform. If this extreme value is the extreme value of the cycle when the time point when it changes from increasing to decreasing by the arithmetic circuit,
The value at that point (immediately before the decrease) may be sampled.
そして、サンプリングしたデータがリップル周期内に何
個あるかを求めてＬを求め、以下の式により基準状態時
のリップルを除去する。Then, L is obtained by finding how many sampled data are in the ripple cycle, and the ripple in the reference state is removed by the following formula.
この式を用いることで、基準状態時に現れているリップ
ルを除くことができ、観測したいＥの変動、すなわち負
荷変動を観測できる。 By using this formula, the ripple appearing in the reference state can be removed, and the fluctuation of E desired to be observed, that is, the load fluctuation can be observed.
ここで、具体的に説明する。穿孔作業中に検出される検
出信号の波形を拡大表示した第７図で、検出信号の一周
期の極値（例えば、最大値）をサンプルし、この時点を
基点としてｋ番目のサンプル値をＸ(k)とし、また基準
時に出現するリップルの周期内に存在する極値の平均個
数をＬとし、ｍおよびｎを検出の目的に応じて「１」な
いし「５×Ｌ」の範囲に選ばれる定数とすると、「ｋ」
番目の時点で表現される負荷変化に対応する値（以下、
サメイション値という。）Ｘs(k)はこの演算回路で上式
に基づいて演算され、この演算により外乱要因による雑
音は軽減される。Here, a specific description will be given. FIG. 7 is an enlarged view of the waveform of the detection signal detected during the drilling work. In FIG. 7, the extreme value (for example, the maximum value) of one cycle of the detection signal is sampled, and the k-th sample value is taken as the starting point from this point to be X (k) and the average number of extreme values existing within the period of the ripple appearing at the time of reference is L, and m and n are selected from the range of "1" to "5 × L" according to the purpose of detection. If it is a constant, "k"
The value corresponding to the load change expressed at the second time point (hereinafter,
It is called the summation value. ) X s (k) is calculated by this calculation circuit based on the above equation, and noise due to disturbance factors is reduced by this calculation.
この実施例では、Ｌ＝６、ｍ＝３、ｎ＝10として前記式
を展開すると、絶対値演算の中は、サンプリング点ｋ，
ｋ−１……ｋ−９の各々に対して周期Ｌ（この場合は
６）毎にサンプリング値の過去３周期分の平均を求めて
減算している。これは周期Ｌ毎に必ず現れる信号がある
場合にそれを除去するための演算を行っていることで、
これにより、リップルＸ(k)への影響が除去され、かつ
ｋからｋ−９までの点の加算を行うことでサンプル値の
10個分のデータの平均を行って、その周期以下の信号の
影響を除去していることを示す。In this embodiment, when the above formula is expanded with L = 6, m = 3, and n = 10, sampling points k,
For each of the k-1 ... k-9, the average of the past three cycles of the sampling value is obtained and subtracted for each cycle L (6 in this case). This is because when there is a signal that always appears in every cycle L, the calculation is performed to remove it.
As a result, the effect on the ripple X (k) is removed, and the addition of points from k to k-9
It is shown that the data of 10 pieces is averaged to remove the influence of signals below the period.
ここで、正常刃先による切削時の検出信号および摩耗刃
先による切削時の検出信号のそれぞれのサメイション値
を出力プリンタで重ね打ちした結果を第８図に示す。図
に示すように、摩耗刃先による切削時の値（丸印で示す
値）と正常刃先による切削時の値 とは顕著に異なる。判定回路７には閾値が設定され、閾
値を超過するサメイション値があるときに異常発生と判
定される。Here, FIG. 8 shows a result obtained by repeatedly striking the summation values of the detection signal at the time of cutting by the normal blade edge and the detection signal at the time of cutting by the worn edge by the output printer. As shown in the figure, the value when cutting with a worn cutting edge (value indicated by a circle) and the value when cutting with a normal cutting edge Is significantly different from. A threshold is set in the determination circuit 7, and when there is a summation value exceeding the threshold, it is determined that an abnormality has occurred.
本発明で電圧変成器ＰＴに印加される電圧は商用電源で
その電圧値はほぼ安定しているが、多少の変動は電動機
の供給電流の変動を招き、したがって第一信号と第二信
号との差信号Ｅに対する電源電圧の変動による影響は極
めて僅少である。In the present invention, the voltage applied to the voltage transformer PT is a commercial power supply, and the voltage value thereof is substantially stable, but some fluctuation causes fluctuations in the electric current supplied to the electric motor, so that the first signal and the second signal The influence of the fluctuation of the power supply voltage on the difference signal E is extremely small.
重合反応の進行状況は粘度変化として捕えることができ
る。この粘度変化により微少な負荷変動が交流電気機器
に生ずる。本発明はこの粘度変化検出に応用できる。ま
た、自動車工場などの塗装プロセスで気流調節に肝要な
吸引ファンの制御にも本発明を応用することができる。The progress of the polymerization reaction can be grasped as a change in viscosity. Due to this change in viscosity, a slight load change occurs in the AC electric equipment. The present invention can be applied to this viscosity change detection. The present invention can also be applied to control of a suction fan, which is essential for air flow control in a painting process such as an automobile factory.
本発明は、以上説明したように、検出点を被測定機器か
ら隔離した位置に選べるので、検出器を標準環境の設置
に耐える簡単な構造とすることができ、また測定器自体
が簡単な構成であるので、安価なハードウェアで確実な
故障検出が行える効果がある。As described above, according to the present invention, since the detection point can be selected at a position isolated from the device under test, the detector can have a simple structure that can be installed in a standard environment, and the measurement device itself has a simple configuration. Therefore, there is an effect that reliable failure detection can be performed with inexpensive hardware.
特に、ロボットなどを用いて無人化運転が行われる機械
工場で、予備保守手段として利用してその効果は顕著で
ある。In particular, in a machine factory where unmanned operation is performed using a robot or the like, the effect is remarkable when used as a preliminary maintenance means.
第１図は本発明実施例装置の構成を示すブロック構成
図。 第２図は第１図の検出回路（単相電源用）の構成を示す
回路接続図。 第３図は第１図の検出回路（三相電源用）の構成を示す
回路接続図。 第４図は基準時の検出信号の波形図。 第５図は標準使用時の検出信号の波形図。 第６図は標準外状態での検出信号の波形図。 第７図は検出信号の波形図。 第８図は検出信号のサメイション値。 第９図は動作原理図。 第10図は無負荷時の供給電流の波形図。 第11図は負荷時の供給電流の波形図。 １……電源、２……電動機、３……検出回路、４……ア
ナログ・ディジタル変換器（Ａ／Ｄ変換器）、５……演
算回路、６……出力プリンタ、７……判定回路。FIG. 1 is a block diagram showing the configuration of an apparatus according to the present invention. FIG. 2 is a circuit connection diagram showing the configuration of the detection circuit (for single-phase power supply) of FIG. FIG. 3 is a circuit connection diagram showing the configuration of the detection circuit (for three-phase power supply) of FIG. FIG. 4 is a waveform diagram of the detection signal at the reference time. FIG. 5 is a waveform diagram of the detection signal during standard use. FIG. 6 is a waveform diagram of a detection signal in a nonstandard state. FIG. 7 is a waveform diagram of the detection signal. Figure 8 shows the summation value of the detection signal. FIG. 9 is an operation principle diagram. Figure 10 is a waveform diagram of the supply current with no load. Fig. 11 is a waveform diagram of the supply current under load. 1 ... Power supply, 2 ... Electric motor, 3 ... Detection circuit, 4 ... Analog / digital converter (A / D converter), 5 ... Arithmetic circuit, 6 ... Output printer, 7 ... Judgment circuit.
Claims (6)
力値を測定し、この測定値に基づいてこの機械装置の負
荷変動を検出する方法において、 上記機械装置の基準使用状態時の上記測定値から外乱要
因に基づく周期的波形を抽出し、 上記機械装置の負荷使用時の上記測定値から上記外乱要
因に基づく周期的波形部分を除去する ことを特徴とする負荷変動の検出方法。1. A method of measuring an electric input value of an AC electric device for driving a mechanical device and detecting a load change of the mechanical device based on the measured value, wherein the measurement is performed in a standard use state of the mechanical device. A method for detecting a load fluctuation, comprising extracting a periodic waveform based on a disturbance factor from the value and removing a periodic waveform portion based on the disturbance factor from the measured value when the load of the mechanical device is used.
力値を測定し、この測定値に基づいてこの機械装置の負
荷変動を検出する方法において、 上記機械装置の基準使用状態時の上記測定値から外乱要
因に基づく周期的波形を抽出し、 上記機械装置の負荷使用時の上記測定値のサンプル値を
所定期間にわたり記憶し、 この記憶されたサンプル値に演算処理を行い、 上記基準使用時の外乱要因に基づく周期的波形を上記負
荷使用時の上記測定値のサンプル値からほぼ消失する統
計処理演算を実行する ことを特徴とする負荷変動の検出方法。2. A method for measuring an electric input value of an AC electric device for driving a mechanical device and detecting a load change of the mechanical device based on the measured value, wherein the measurement is performed in a standard use state of the mechanical device. A periodic waveform based on a disturbance factor is extracted from the value, the sample value of the measured value when the load of the mechanical device is used is stored for a predetermined period, and the stored sample value is subjected to arithmetic processing, and when the reference is used. A method for detecting load fluctuations, which comprises performing a statistical processing operation that substantially eliminates the periodic waveform based on the disturbance factor from the sample value of the measured value when the load is used.
力値を測定する測定手段と、この測定手段の出力に基づ
いてこの機械装置の負荷変動を検出する検出手段とを備
えた負荷変動の検出装置において、 上記測定回路は、 上記交流電気機器への印加電圧にかかわる第一検出値を
生成する第一検出手段と、 上記交流電気機器の供給電流にかかわる第二検出値を生
成する第二検出手段と、 インピーダンスの調整により、上記第一検出値と上記第
二検出値のそれぞれの振幅および位相の差異を調整する
回路素子と、 上記第一検出値と上記第二検出値との差の信号を生成す
る回路手段と、 この回路手段の出力を統計処理する演算手段とを備えた
ことを特徴とする負荷変動の検出装置。3. A load variation measuring device comprising: a measuring unit for measuring an electric input value of an AC electric device for driving a mechanical unit; and a detecting unit for detecting a load variation of the mechanical unit based on an output of the measuring unit. In the detection device, the measurement circuit generates a first detection value related to a voltage applied to the AC electric device, and a second detection value related to a supply current of the AC electric device. Detection means, a circuit element that adjusts the difference in the amplitude and phase of the first detection value and the second detection value by adjusting the impedance, of the difference between the first detection value and the second detection value A load fluctuation detecting device comprising: circuit means for generating a signal; and arithmetic means for statistically processing the output of the circuit means.
には、その出力回路に可変容量を含む特許請求の範囲第
(3)項に記載の負荷変動の検出装置。4. The electric input is a single-phase alternating current, and the first detecting means includes a variable capacitance in its output circuit.
The load fluctuation detection device according to the item (3).
には、その入力回路の中性点に可変抵抗器が接続される
特許請求の範囲第(3)項に記載の負荷変動の検出装置。5. The load fluctuation according to claim 3, wherein the electric input is a three-phase alternating current, and a variable resistor is connected to the neutral point of the input circuit of the second detecting means. Detection device.
請求の範囲第(3)項に記載の負荷変動の検出装置。6. The load fluctuation detection device according to claim 3, wherein the calculation means includes a microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61083141A JPH0652205B2 (en) | 1986-04-09 | 1986-04-09 | Load fluctuation detection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61083141A JPH0652205B2 (en) | 1986-04-09 | 1986-04-09 | Load fluctuation detection method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62254025A JPS62254025A (en) | 1987-11-05 |
| JPH0652205B2 true JPH0652205B2 (en) | 1994-07-06 |
Family
ID=13793929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61083141A Expired - Lifetime JPH0652205B2 (en) | 1986-04-09 | 1986-04-09 | Load fluctuation detection method and device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0652205B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2021049568A1 (en) * | 2019-09-13 | 2021-11-04 | 三菱電機エンジニアリング株式会社 | Vibration detection device, vibration detection method and abnormality judgment system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6040233Y2 (en) * | 1982-09-02 | 1985-12-03 | 三洋電機株式会社 | Clothes dryer bearing device |
-
1986
- 1986-04-09 JP JP61083141A patent/JPH0652205B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2021049568A1 (en) * | 2019-09-13 | 2021-11-04 | 三菱電機エンジニアリング株式会社 | Vibration detection device, vibration detection method and abnormality judgment system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62254025A (en) | 1987-11-05 |
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