JP5491210B2 - AC motor monitoring device - Google Patents

AC motor monitoring device Download PDF

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JP5491210B2
JP5491210B2 JP2010008284A JP2010008284A JP5491210B2 JP 5491210 B2 JP5491210 B2 JP 5491210B2 JP 2010008284 A JP2010008284 A JP 2010008284A JP 2010008284 A JP2010008284 A JP 2010008284A JP 5491210 B2 JP5491210 B2 JP 5491210B2
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detecting means
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JP2011147317A (en
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晴久 高村
康裕 安東
和人 川上
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Toshiba Mitsubishi Electric Industrial Systems Corp
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Description

本発明は、同期電動機例えばヒステリシスモータ、或いは非同期電動機例えば誘導電動機の運転状態を監視する交流電動機の監視装置に関する。   The present invention relates to a monitoring device for an AC motor that monitors the operating state of a synchronous motor such as a hysteresis motor or an asynchronous motor such as an induction motor.

従来、共通の交流電源にヒステリシスモータを複数台並列接続し、負荷を駆動するシステムにおいては、個々のヒステリシスモータの状態監視を行い、異常となったヒステリシスモータを切離して、運転を継続するようにしている。   Conventionally, in a system in which multiple hysteresis motors are connected in parallel to a common AC power supply and the load is driven, the status of each hysteresis motor is monitored, and the abnormal hysteresis motor is disconnected to continue operation. ing.

ヒステリシスモータの監視方法として所謂平均ベクトル差法が従来から使用されている。この方法は、各ヒステリシスモータの電流ベクトルを検出し、平均化した基準（平均電流ベクトル）と個々の電流ベクトルの差が予め設定された異常検出レベルを超過した場合にモータ異常と判断している（例えば特許文献１参照。）。またこの異常検出レベルは、各ヒステリシスモータの特性のバラツキにより、正常であるにも関わらず異常と判定されないように設定している。検出精度を向上するために、平均電流ベクトル差法では、監視グループ毎の基準ベクトルの補正を行なう（例えば特許文献２参照。）、或いは、監視する台数に応じて、異常検出するレベルを調整するようにしている（例えば特許文献３参照。）。   A so-called average vector difference method has been conventionally used as a method for monitoring a hysteresis motor. This method detects the current vector of each hysteresis motor, and determines that the motor is abnormal when the difference between the averaged reference (average current vector) and each current vector exceeds a preset abnormality detection level. (For example, refer to Patent Document 1). This abnormality detection level is set so that it is not determined to be abnormal although it is normal due to variations in the characteristics of each hysteresis motor. In order to improve the detection accuracy, the average current vector difference method corrects the reference vector for each monitoring group (see, for example, Patent Document 2), or adjusts the level of abnormality detection according to the number of monitored units. (For example, refer to Patent Document 3).

特開２０００−０９２８９４号公報（全体）JP 2000-092894 A (Overall) 特開２０００−０９２８９５号公報（全体）JP 2000-092895 A (Overall) 特開２０００−２５３６９５号公報（全体）JP 2000-253695 A (Overall)

ヒステリシスモータはモータ個々の特性のバラツキにより、電流値の変動が大きく、異常検出レベルを小さく設定できない。異常値検出レベルを小さく設定した場合、正常なヒステリシスモータが異常と判定される恐れがある。特許文献２乃至３で提案された平均電流ベクトル差法は、電流振幅のバラツキも考慮した監視方法を提案しているが、電流振幅のバラツキが大きい場合には限界があり、平均電流ベクトル差法の本質的な精度向上は困難であった。   Hysteresis motors have large current value fluctuations due to variations in individual motor characteristics, and the abnormality detection level cannot be set small. If the abnormal value detection level is set small, there is a possibility that a normal hysteresis motor is determined to be abnormal. The average current vector difference method proposed in Patent Documents 2 to 3 proposes a monitoring method that also takes into account variations in current amplitude, but there is a limit when the variation in current amplitude is large, and the average current vector difference method. It was difficult to improve the accuracy.

本発明は上記問題に鑑みて為されたもので、電流振幅の影響を受け難く、検出精度の高い交流電動機の監視装置を提供することを目的としている。   The present invention has been made in view of the above problems, and an object thereof is to provide a monitoring device for an AC motor that is not easily affected by current amplitude and has high detection accuracy.

前記目的を達成するために、本発明の第１の発明である交流電動機の監視装置は、共通の交流電源に対して並列接続された複数の交流電動機の異常を監視する交流電動機の監視装置であって、前記交流電源の電圧を検出する電圧検出手段と、前記各交流電動機の各々に流れる個別電流を検出する個別電流検出手段と、前記交流電動機全体に流れる全電流を検出する全電流検出手段と、前記電圧検出手段並びに前記個別電流検出手段及び前記全電流検出手段の出力から各々の個別の電力及び全体の電力を演算する電力演算手段と、前記電圧検出手段、前記個別電流検出手段及び前記全電流検出手段の出力からそれぞれの実効値を演算する実効値演算手段と、前記電力演算手段と前記実効値演算手段の出力から、前記全電流と前記個別電流の各々の位相差を演算する位相差演算手段とを備え、前記各々の位相差が前記交流電動機によって定められた異常判定レベルを超えたとき、前記交流電動機が異常であると判定することを特徴としている。   In order to achieve the above object, an AC motor monitoring apparatus according to a first aspect of the present invention is an AC motor monitoring apparatus that monitors an abnormality of a plurality of AC motors connected in parallel to a common AC power source. A voltage detection means for detecting the voltage of the AC power supply; an individual current detection means for detecting an individual current flowing through each of the AC motors; and a total current detection means for detecting a total current flowing through the entire AC motor. Power calculating means for calculating the individual power and the total power from the outputs of the voltage detecting means and the individual current detecting means and the total current detecting means; the voltage detecting means; the individual current detecting means; Effective value calculation means for calculating the respective effective values from the output of the total current detection means, and from the outputs of the power calculation means and the effective value calculation means, each of the total current and the individual current And a phase difference calculating means for calculating a phase difference, when the phase difference of the each exceeds an abnormality determination level defined by said alternating current motor, it is characterized in that the AC motor is determined to be abnormal.

また、本発明の第２の発明である交流電動機の監視装置は、共通の交流電源に対して並列接続された複数の交流電動機の異常を監視する交流電動機の監視装置であって、前記交流電源の電圧を検出する電圧検出手段と、前記各交流電動機の各々に流れる個別電流を検出する個別電流検出手段と、前記個別電流検出手段の出力の平均値を検出する平均電流検出手段と、前記電圧検出手段並びに前記個別電流検出手段及び前記平均電流検出手段の出力から各々の個別の電力及び全体の電力を演算する電力演算手段と、前記電圧検出手段、前記個別電流検出手段及び前記平均電流検出手段の出力からそれぞれの実効値を演算する実効値演算手段と、前記電力演算手段と前記実効値演算手段の出力から、前記平均電流と前記個別電流の各々の位相差を演算する位相差演算手段とを備え、前記各々の位相差が前記交流電動機によって定められた異常判定レベルを超えたとき、前記交流電動機が異常であると判定することを特徴としている。   The AC motor monitoring device according to the second aspect of the present invention is a monitoring device for an AC motor that monitors an abnormality of a plurality of AC motors connected in parallel to a common AC power source. Voltage detecting means for detecting the voltage of the AC motor, individual current detecting means for detecting the individual current flowing through each of the AC motors, average current detecting means for detecting an average value of the output of the individual current detecting means, and the voltage A power calculating means for calculating the individual power and the total power from the outputs of the detecting means and the individual current detecting means and the average current detecting means; the voltage detecting means; the individual current detecting means; and the average current detecting means. The effective value calculating means for calculating the respective effective values from the outputs of the output, the phase difference between the average current and the individual current from the outputs of the power calculating means and the effective value calculating means And a phase difference computation means for calculation, when the phase difference of the each exceeds an abnormality determination level defined by said alternating current motor, it is characterized in that the AC motor is determined to be abnormal.

更に、本発明の第３の発明である交流電動機の監視装置は、上記第２の発明において、監視対象の交流電動機を選択する交流電動機選択手段を更に備え、前記平均電流検出手段は、前記交流電動機選択手段によって選択された交流電動機を除く前記交流電動機の前記個別電流検出手段の出力の平均値を求めるようにしたことを特徴としている。 Furthermore, the monitoring apparatus for an AC motor according to the third aspect of the present invention further comprises AC motor selection means for selecting an AC motor to be monitored in the second invention, wherein the average current detection means is the AC current detection means. An average value of the outputs of the individual current detection means of the AC motor excluding the AC motor selected by the motor selection means is obtained.

本発明によれば、電流振幅の影響を受け難く、検出精度の高い交流電動機の監視装置を提供することが可能となる。   ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the monitoring apparatus of the alternating current motor which is hard to receive to the influence of an electric current amplitude and has high detection accuracy.

本発明の実施例１に係る交流電動機の監視装置の回路構成図。The circuit block diagram of the monitoring apparatus of the alternating current motor which concerns on Example 1 of this invention. 図１におけるＵ相の全電流、個別電流、線間電圧波形を示す図。The figure which shows the U-phase total current in FIG. 1, an individual current, and a voltage waveform between lines. 図１における電流ベクトルを示す図。The figure which shows the current vector in FIG. 本発明の実施例２に係る交流電動機の監視装置の回路構成図。The circuit block diagram of the monitoring apparatus of the alternating current motor which concerns on Example 2 of this invention. 本発明の実施例３に係る交流電動機の監視装置の回路構成図。The circuit block diagram of the monitoring apparatus of the alternating current motor which concerns on Example 3 of this invention. 本発明の実施例４に係る交流電動機の監視装置の回路構成図。The circuit block diagram of the monitoring apparatus of the alternating current motor which concerns on Example 4 of this invention. 本発明の実施例５に係る交流電動機の監視装置の回路構成図。The circuit block diagram of the monitoring apparatus of the alternating current motor which concerns on Example 5 of this invention. 本発明の実施例６に係る交流電動機の監視装置の回路構成図。The circuit block diagram of the monitoring apparatus of the alternating current motor which concerns on Example 6 of this invention.

以下、本発明に係る交流電動機の監視装置の実施例について図面を参照して説明する。以下の説明では、交流電動機としてヒステリシスモータを例に挙げて説明するが、これに限らず通常の同期電動機、或いは非同期電動機例えば誘導電動機であっても本発明の適用は可能である。   Embodiments of an AC motor monitoring device according to the present invention will be described below with reference to the drawings. In the following description, a hysteresis motor will be described as an example of an AC motor. However, the present invention is not limited thereto, and the present invention can be applied to a normal synchronous motor or an asynchronous motor such as an induction motor.

以下、本発明の実施例１に係る交流電動機の監視装置について図１乃至図３を参照して説明する。図１は本発明の実施例１に係る交流電動機の監視装置の回路構成図である。   Hereinafter, an AC motor monitoring apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a circuit configuration diagram of an AC motor monitoring apparatus according to Embodiment 1 of the present invention.

共通の交流電源であるインバータ装置１は、個別開閉器２（２１、２２、・・・、２ｎ）を介してヒステリシスモータ３（３１、３２、・・・、３ｎ）に交流電力を供給して並列駆動している。インバータ装置１の出力電流は、全電流検出器４によって検出され、監視回路７に与えられる。また、個別開閉器２（２１、２２、・・・、２ｎ）に流れる電流は、個別電流検出器５（５１、５２、・・・、５ｎ）によって夫々検出され、監視回路７に与えられる。インバータ装置１の出力電圧は、電圧検出器６によって検出され、監視回路７に与えられる。監視回路７は上記の各電気量からヒステリシスモータ３（３１、３２、・・・、３ｎ）の異常を判定し、必要に応じて異常と判定されたヒステリシスモータ３（３１、３２、・・・、３ｎ）に対応する個別開閉器２（２１、２２、・・・、２ｎ）を開放する。   The inverter device 1 which is a common AC power supply supplies AC power to the hysteresis motor 3 (31, 32,..., 3n) via the individual switches 2 (21, 22,..., 2n). They are driven in parallel. The output current of the inverter device 1 is detected by the total current detector 4 and given to the monitoring circuit 7. Further, the currents flowing through the individual switches 2 (21, 22,..., 2n) are respectively detected by the individual current detectors 5 (51, 52,..., 5n) and given to the monitoring circuit 7. The output voltage of the inverter device 1 is detected by the voltage detector 6 and given to the monitoring circuit 7. The monitoring circuit 7 determines the abnormality of the hysteresis motor 3 (31, 32,..., 3n) from each of the above-mentioned electric quantities, and the hysteresis motor 3 (31, 32,. 3n), the individual switch 2 (21, 22,..., 2n) is opened.

以下、監視回路７の内部構成について説明する。   Hereinafter, the internal configuration of the monitoring circuit 7 will be described.

個別電流検出器５（５１、５２、・・・、５ｎ）によって検出された個別電流は切替回路７１に与えられ、切替回路７１で選択されたヒステリシスモータ３ｋ（ｋ＝１、・・・、ｎ）の個別電流ｉｕｋが保持回路７２に与えられる。同様に全電流検出器４によって検出された全電流ｉｕａと電圧検出器６によって検出された線間電圧Ｖｕｖも保持回路７２に与えられる。保持回路７２はこれ等の電気量を保持し、図２に示すような波形をＡＤ変換回路７３に与える。   The individual current detected by the individual current detector 5 (51, 52,..., 5n) is given to the switching circuit 71, and the hysteresis motor 3k selected by the switching circuit 71 (k = 1,..., N). ) Is supplied to the holding circuit 72. Similarly, the total current iua detected by the total current detector 4 and the line voltage Vuv detected by the voltage detector 6 are also supplied to the holding circuit 72. The holding circuit 72 holds these amounts of electricity and gives the AD converter circuit 73 with a waveform as shown in FIG.

ＡＤ変換回路７３は、図２に示したようなサンプリング周期Ｔでこれ等の波形をデジタル値に変換し、例えば１周期分ｍ個のサンプリングデータを電力演算回路７４及び実効値演算回路７５に与える。電力演算回路７４においては全電力Ｐａ及び個々のヒステリシスモータ３ｋの個別電力Ｐｋを演算し位相差演算回路７６に与える。また、実効値演算回路７６においては線間電圧実効値Ｖｕａ、全電流実効値Ｉｕａ及び個別電流実効値Ｉｕｋを演算によって求め位相差演算回路７６に与える。   The AD conversion circuit 73 converts these waveforms into digital values at a sampling period T as shown in FIG. 2, and supplies m sampling data for one period to the power calculation circuit 74 and the effective value calculation circuit 75, for example. . In the power calculation circuit 74, the total power Pa and the individual power Pk of each hysteresis motor 3k are calculated and supplied to the phase difference calculation circuit 76. In the effective value calculation circuit 76, the line voltage effective value Vua, the total current effective value Iua, and the individual current effective value Iuk are obtained by calculation and supplied to the phase difference calculation circuit 76.

位相差演算回路７６においては、これ等与えられた電気量から後述するような演算を行なうことによって全電流ｉｕａと個別電流ｉｕｋの位相差Δθｋを求め、異常判定回路７７に与える。異常判定回路７７は、図３に示すように、位相差Δθｋが所定の異常判定レベルであるプラスマイナスθ１以内であれば正常と判断する。   In the phase difference calculation circuit 76, the phase difference Δθk between the total current iua and the individual current iuk is obtained by performing a calculation as will be described later from these supplied electric quantities, and provided to the abnormality determination circuit 77. As shown in FIG. 3, the abnormality determination circuit 77 determines that the phase difference Δθk is normal if it is within plus or minus θ1 that is a predetermined abnormality determination level.

以下、上述した演算の詳細について数式を用いて説明する。   Hereinafter, details of the above-described calculation will be described using mathematical expressions.

まず、電圧検出値Ｖｕｖ、全電流Ｉｕａと個別電流Ｉｕｋは、式（１）乃至（３）に示したように平衡した正弦波とする。ここで位相θｓは、θｓ＝ωｔ（ω＝２πｆ、ｆはインバータ装置１の出力周波数。）とする。   First, the voltage detection value Vuv, the total current Iua, and the individual current Iuk are assumed to be balanced sine waves as shown in the equations (1) to (3). Here, the phase θs is θs = ωt (ω = 2πf, f is the output frequency of the inverter device 1).

Ｖｕｖ ＝ Ａsinθs （１）
Ｉｕａ ＝ Ｂsin( θs + θa ) （２）
Ｉｕｋ ＝ Ｃsin( θs + θｋ ) （３）
ここで、Ａは電圧振幅、Ｂは全電流振幅、Ｃは個別電流振幅、θａは全電流Ｉｕａの位相θｓからの位相差であり、θｋは個々のヒステリシスモータ３ｋに流れる個別電流ｉｕｋの位相θｓからの位相差である。 Vuv = Asinθs (1)
Iua = Bsin (θs + θa) (2)
Iuk = Csin (θs + θk) (3)
Here, A is the voltage amplitude, B is the total current amplitude, C is the individual current amplitude, θa is the phase difference from the phase θs of the total current Iua, and θk is the phase θs of the individual current iuk flowing through each hysteresis motor 3k. The phase difference from

図２において、サンプリング時刻（回数）ｔｋ１、ｔｋ２、・・、ｔｋｉ、・・、ｔｋｍにおける上記諸量の検出値ｖｕｖ、ｉｕａ、ｉｕｋは、式（４）乃至（６）で表わすことができる。ここで、ｋはヒステリシスモータ番号、ｉはサンプリング回数である。   In FIG. 2, the detected values vuv, iua, iuk of the various quantities at the sampling times (number of times) tk1, tk2,..., Tki,..., Tkm can be expressed by equations (4) to (6). Here, k is a hysteresis motor number, and i is the number of samplings.

ｖｕｖ ＝ Ｖｕｖ(t= tki) ・・・（４）
ｉｕａ ＝ Ｉｕａ(t= tki) ・・・（５）
ｉｕｋ ＝ Ｉｕｋ(t= tki) ・・・（６）
次に、電力演算回路７４により、全電力Ｐａとヒステリシスモータの個別電力Ｐｋをそれぞれ（７）式及び（８）式によって演算する。ここでｍはサンプル数である。

Figure 0005491210
Figure 0005491210
 vuv = Vuv (t = tki) (4)
iua = Iua (t = tki) (5)
iuk = Iuk (t = tki) (6)
Next, the power calculation circuit 74 calculates the total power Pa and the individual power Pk of the hysteresis motor according to the equations (7) and (8), respectively. Here, m is the number of samples.
Figure 0005491210
Figure 0005491210

更に実効値演算回路７５により、電圧Ｖｕｖ、全電流Ｉｕａ、個別電流Ｉｕｋの実効値をそれぞれ（９）式、（１０）式及び（１１）式で算出する。

Figure 0005491210
Figure 0005491210
Figure 0005491210
 Further, the effective value calculation circuit 75 calculates the effective values of the voltage Vuv, the total current Iua, and the individual current Iuk using the equations (9), (10), and (11), respectively.
Figure 0005491210
Figure 0005491210
Figure 0005491210

位相差演算回路７６においては、全電力が（１２）式によって得られることから（１３）式によって位相差θaを求めることができる。

Figure 0005491210
Figure 0005491210
 In the phase difference calculation circuit 76, since the total power is obtained by the equation (12), the phase difference θa can be obtained by the equation (13).
Figure 0005491210
Figure 0005491210

同様に個々のヒステリシスモータに供給される電力Ｐｋと位相差θｋもそれぞれ（１４）式、（１５）)式から求めることができる。

Figure 0005491210
Figure 0005491210
 Similarly, the electric power Pk and the phase difference θk supplied to each hysteresis motor can be obtained from the equations (14) and (15)), respectively.
Figure 0005491210
Figure 0005491210

そして、異常判定回路７７において、全電流の位相差θaと個別電流の位相差θkの差Δθｋを（１６）式によって演算する。   Then, in the abnormality determination circuit 77, the difference Δθk between the total current phase difference θa and the individual current phase difference θk is calculated by the equation (16).

Δθｋ＝θa − θｋ ・・・（１６）
図３に示すように、主にヒステリシスモータの特性から決定される異常判定位相差レベルをΔθlとすると、以下の（１７）式が成立したとき、ｋ番目のヒステリシスモータ３ｋが異常であると判定する。 Δθk = θa−θk (16)
As shown in FIG. 3, when the abnormality determination phase difference level mainly determined from the characteristics of the hysteresis motor is Δθ1, it is determined that the k-th hysteresis motor 3k is abnormal when the following equation (17) is satisfied. To do.

｜Δθｋ｜ ＞ Δθl ・・・（１７）
尚、上記における電流検出は、単相の電流を検出した場合であるが、２相電流検出を行った場合には、以下の（１８）式から電力を算出し、（１９）式より位相差θaを求める。

Figure 0005491210
Figure 0005491210
 | Δθk |> Δθl (17)
The current detection in the above is a case where a single-phase current is detected. However, when two-phase current detection is performed, the power is calculated from the following equation (18), and the phase difference is calculated from the equation (19). Find θa.
Figure 0005491210
Figure 0005491210

但しここで、Ｖａ＝（Ｖｕｖｅ＋Ｖｗｖｅ）／２、Ｉａ＝（Ｉｕａｅ＋Ｉｗａｅ）／２である。 However, Va = (Vuve + Vwve) / 2 and Ia = (Iuae + Iway) / 2.

同様に３相電流検出を行った場合は、以下の（２０）、（２１）式より位相差θaを算出する。

Figure 0005491210
Figure 0005491210
 但しここで、Ｖａ＝（Ｖｕｖｅ＋Ｖｗｖｅ）／２、Ｉａ＝（Ｉｕａｅ＋Ｉｖａｅ＋Ｉｗｕａ）／３である。 Similarly, when three-phase current detection is performed, the phase difference θa is calculated from the following equations (20) and (21).
Figure 0005491210
Figure 0005491210
 However, here Va = (Vuve + Vwve) / 2 and Ia = (Iuae + Ivae + Iwua) / 3.

但しここで、Ｖａ＝（Ｖｕｖｅ＋Ｖｖｗｅ＋Ｖｗｕ）／３、Ｉａ＝（Ｉｕａｅ＋Ｉｗａｅ）／２である。 However, Va = (Vuve + Vvwe + Vwu) / 3 and Ia = (Iuae + Iway) / 2.

以上の（１８）式乃至（２１）式は全電力から全電流の位相差を演算する例であるが、個別電流の検出を２相または３相で行なった場合、各ヒステリシスモータの個別電力及び個別電流の位相差についても上記と同様に算出することが可能となることは明らかである。   The above formulas (18) to (21) are examples of calculating the phase difference of the total current from the total power. However, when the individual current is detected in two or three phases, the individual power of each hysteresis motor and It is obvious that the phase difference of the individual current can be calculated in the same manner as described above.

以上述べた実施例１によれば、電流位相によってヒステリシスモータ３の異常を検出するようにしているので、電流振幅値のバラツキの影響を少なくし、異常検出精度の高いヒステリシスモータの監視装置を提供することができる。   According to the first embodiment described above, the abnormality of the hysteresis motor 3 is detected based on the current phase, so that the influence of the variation in the current amplitude value is reduced, and a monitoring apparatus for the hysteresis motor with high abnormality detection accuracy is provided. can do.

図４は本発明の実施例２に係る交流電動機の監視装置の回路構成図である。   FIG. 4 is a circuit diagram of an AC motor monitoring apparatus according to Embodiment 2 of the present invention.

この実施例２の各部について、図１の本発明の実施例１に係る交流電動機の監視装置の回路構成図の各部と同一部分は同一符号で示し、その説明は省略する。この実施例２が実施例１と異なる点は、位相補正回路７８と設定補正回路７９を設け、異常判定回路７７の判定条件を補正する構成とした点である。 In the second embodiment, the same components as those in the circuit configuration diagram of the monitoring apparatus for an AC motor according to the first embodiment of the present invention shown in FIG. The second embodiment is different from the first embodiment in that a phase correction circuit 78 and a setting correction circuit 79 are provided to correct the determination condition of the abnormality determination circuit 77.

図３に示したように、個々のヒステリシスモータの電流、力率のバラツキがあった場合、正常動作時であっても位相差△θｋが発生する。従って、個々のヒステリシスモータの正常運転動作確認時等の位相差△θｋをΔθ0ｋとして保存しておき、位相補正回路７８の補正出力をΔθ0ｋとし、このΔθ0ｋを位相差△θｋから減算して本来判定すべき位相差△θｋとすることによって、個々のヒステリシスモータの特性バラツキを補正することができる。   As shown in FIG. 3, when there is variation in the current and power factor of each hysteresis motor, a phase difference Δθk occurs even during normal operation. Therefore, the phase difference Δθk when confirming the normal operation of each hysteresis motor is stored as Δθ0k, the correction output of the phase correction circuit 78 is set as Δθ0k, and this Δθ0k is subtracted from the phase difference Δθk to determine originally. By setting the phase difference to be set to Δθk, it is possible to correct the characteristic variation of each hysteresis motor.

設定補正回路７９では、異常判定の異常検出レベル設定の補正値△θlrefを算出する。基準となる全電流は異常ヒステリシスモータも含めているので、監視するヒステリシスモ一夕３の台数により、（１７）式の異常検出レベルΔθlは変化する。監視台数が少ない場合ほど、異常が発生したときの基準の変化は大きくなるので、例えば設定補正回路７９の出力△θlrefは規定値△θlを稼動台数Ｎで除算した値（２２）式とする。   The setting correction circuit 79 calculates a correction value Δθlref for abnormality detection level setting for abnormality determination. Since all the reference currents include the abnormal hysteresis motor, the abnormality detection level Δθl in the equation (17) changes depending on the number of hysteresis motors 3 to be monitored. The smaller the number of monitored units, the greater the change in the reference when an abnormality occurs. For example, the output Δθlref of the setting correction circuit 79 is expressed by the equation (22) obtained by dividing the specified value Δθl by the number N of operating units.

Δθlref＝ Δθl／Ｎ ・・・（２２）
以上によりこの実施例２におけるヒステリシスモータ３の異常判定式は、位相補正回路７８と設定補正回路７９の出力を反映することによって以下となる。 Δθlref = Δθl / N (22)
As described above, the abnormality determination formula of the hysteresis motor 3 in the second embodiment is as follows by reflecting the outputs of the phase correction circuit 78 and the setting correction circuit 79.

｜Δθｋ − Δθ0ｋ｜ ＞ Δθl − Δθlref ・・・（２３）
（２３）式による異常判定は、右辺で個々のヒステリシスモータ３の電流、力率や検出器のバラツキを補正し、左辺で台数変化に対応した異常判定レベルを補正しているので、ヒステリシスモータ異常判定レベルの精度を向上する。尚、位相補正回路７８及び設定補正回路７９は、いずれか一方のみを用いる構成としても良い。 | Δθk−Δθ0k |> Δθl−Δθlref (23)
In the abnormality determination by equation (23), the current, power factor and detector variations of the individual hysteresis motors 3 are corrected on the right side, and the abnormality determination level corresponding to the change in the number of units is corrected on the left side. Improve the accuracy of the judgment level. Note that only one of the phase correction circuit 78 and the setting correction circuit 79 may be used.

以上述べた実施例２によれば、ヒステリシスモータ３の特性、あるいは個別電流検出器５の個々のバラツキの補正、また監視するヒステリシスモータ３の台数による異常判定レベルの補正を行うので、更に検出精度の高い交流電動機の監視装置を提供できる。   According to the second embodiment described above, the characteristics of the hysteresis motor 3 or individual variations of the individual current detector 5 are corrected, and the abnormality determination level is corrected depending on the number of hysteresis motors 3 to be monitored. It is possible to provide a high-accuracy AC motor monitoring device.

図５は本発明の実施例３に係る交流電動機の監視装置の回路構成図である。   FIG. 5 is a circuit configuration diagram of an AC motor monitoring apparatus according to Embodiment 3 of the present invention.

この実施例３の各部について、図４の本発明の実施例２に係る交流電動機の監視装置の回路構成図の各部と同一部分は同一符号で示し、その説明は省略する。この実施例３が実施例２と異なる点は、全電流検出器４に代えて個別電流検出器５（５１、５２、・・・、５ｎ）の検出値の平均値を演算する平均回路７１０を設け、この平均回路７１０の出力を保持回路７２に与える構成とした点である。 The same parts as those in the circuit configuration diagram of the monitoring apparatus for an AC motor according to the second embodiment of the present invention shown in FIG. The third embodiment is different from the second embodiment in that an average circuit 710 that calculates the average value of the detection values of the individual current detectors 5 (51, 52,..., 5n) instead of the total current detector 4 is provided. The average circuit 710 is provided with the output to the holding circuit 72.

監視回路７は、平均回路７１０で求めた個別電流の平均値と個別電流検出値との電流位相差がヒステリシスモータ３ｋによって決められる異常判定レベルを超えた時、異常判定回路７７によってヒステリシスモータ３ｋを異常と判定する。従ってこの場合、ＡＤ変換回路７７の出力は全電流ｉｕａに代えて平均電流ｉｕａｖとなり、実効値演算回路の出力は全電流実効値Iｕａに代えて平均電流実効値Iｕａｖとなる。   When the current phase difference between the average value of the individual current obtained by the averaging circuit 710 and the individual current detection value exceeds the abnormality determination level determined by the hysteresis motor 3k, the monitoring circuit 7 causes the abnormality determination circuit 77 to set the hysteresis motor 3k. Judge as abnormal. Therefore, in this case, the output of the AD conversion circuit 77 becomes the average current iuav instead of the total current iua, and the output of the effective value calculation circuit becomes the average current effective value Iuav instead of the total current effective value Iua.

実施例１及び２では、２種類の電流検出器（全電流検出器４と個別電流検出器５）を使用するので、電流検出器の定格等の違いによる検出誤差が発生する恐れがあるが、この実施例３では、１種類の電流検出器５のみを使用するので、上記検出誤差を小さくすることが可能となる。   In Examples 1 and 2, since two types of current detectors (the total current detector 4 and the individual current detector 5) are used, there is a possibility that a detection error due to a difference in the rating of the current detector may occur. In the third embodiment, since only one type of current detector 5 is used, the detection error can be reduced.

図６は本発明の実施例４に係る交流電動機の監視装置の回路構成図である。この実施例４の各部について、図５の本発明の実施例３に係る交流電動機の監視装置の回路構成図の各部と同一部分は同一符号で示し、その説明は省略する。この実施例４が実施例３と異なる点は、ＨＭ選択回路７１１を設け、その出力を切替回路７１及び平均回路７１０に与える構成とした点である。   FIG. 6 is a circuit configuration diagram of an AC motor monitoring apparatus according to Embodiment 4 of the present invention. In the fourth embodiment, the same parts as those in the circuit configuration diagram of the monitoring apparatus for an AC motor according to the third embodiment of the present invention shown in FIG. The fourth embodiment is different from the third embodiment in that the HM selection circuit 711 is provided and its output is given to the switching circuit 71 and the average circuit 710.

ＨＭ選択回路７１１は、ｎ台のヒステリシスモータ３１、３２、・・・、３ｎのうち監視対象となるヒステリシスモータ３ｋを選択する。そして、切替回路７１がＨＭ選択回路７１１で選択されたヒステリシスモータ３ｋの電流を保持回路７２に与えているとき、平均回路７１０は、ヒステリシスモータ３ｋの電流を除く他の全ての個別電流の平均値を演算して保持回路７２に与える。   The HM selection circuit 711 selects the hysteresis motor 3k to be monitored among the n hysteresis motors 31, 32,..., 3n. When the switching circuit 71 gives the current of the hysteresis motor 3k selected by the HM selection circuit 711 to the holding circuit 72, the average circuit 710 calculates the average value of all the individual currents other than the current of the hysteresis motor 3k. Is given to the holding circuit 72.

このような構成によれば、実施例３が全てのヒステリシスモータ３の平均電流を基準としているのに対し、この実施例４は異常判定対象の１台のヒステリシスモータ３ｋ以外のヒステリシスモータの平均電流を基準として異常判定を行なうことになる。   According to such a configuration, the third embodiment uses the average current of all the hysteresis motors 3 as a reference, while the fourth embodiment uses the average current of hysteresis motors other than one hysteresis motor 3k to be determined for abnormality. An abnormality is determined based on the above.

従って、監視対象のヒステリシスモータ３ｋが異常だった場合、平均電流の位相がこの異常なヒステリシスモータ３ｋの影響を受けることがなくなるのでより検出精度が向上する。   Therefore, when the monitored hysteresis motor 3k is abnormal, the phase of the average current is not affected by the abnormal hysteresis motor 3k, so that the detection accuracy is further improved.

図７は本発明の実施例５に係る交流電動機の監視装置の回路構成図である。この実施例５の各部について、図４の本発明の実施例２に係る交流電動機の監視装置の回路構成図の各部と同一部分は同一符号で示し、その説明は省略する。この実施例５が実施例２と異なる点は、電圧検出器６に代えて位相基準回路７１２を設け、この出力を保持回路７２に与える構成とした点、ＡＤ変換回路の出力の電圧信号に代えて上記位相基準の正弦信号を同相Ｉ演算回路７４Ａに与える構成とした点である。 FIG. 7 is a circuit configuration diagram of an AC motor monitoring apparatus according to Embodiment 5 of the present invention. In the fifth embodiment, the same parts as those of the circuit configuration diagram of the monitoring apparatus for an AC motor according to the second embodiment of the present invention shown in FIG. The fifth embodiment is different from the second embodiment in that a phase reference circuit 712 is provided in place of the voltage detector 6 and this output is supplied to the holding circuit 72. Instead, the voltage signal is output from the AD converter circuit. The phase reference sine signal is supplied to the in-phase I arithmetic circuit 74A.

全電流から算出した電力Ｐａは、（７）式に示すように、電圧ｖｕｖと電流ｉｕａと積算した値となっている。電圧ｖｕｖは（１）式から、ｖｕｖ＝Ａｓｉｎθｓで表すことができる。正弦波の場合、実効値の√２倍が振幅となるので、振幅Ａ＝√２Ｖuveとなる。これを（１３）式に代入すると、実効値Ｖuveを消去することができ、全電流の位相θaは下記（２４）式で表わすことができる。同様に個別電流の位相θｋも（２５）式で表わすことができる。

Figure 0005491210
Figure 0005491210
 The electric power Pa calculated from the total current is a value obtained by integrating the voltage vuv and the current iua as shown in the equation (7). The voltage vuv can be expressed by vuv = Asinθs from the equation (1). In the case of a sine wave, the amplitude is √2 times the effective value, so the amplitude is A = √2 Vuve. By substituting this into the equation (13), the effective value Vuve can be eliminated, and the phase θa of the total current can be represented by the following equation (24). Similarly, the phase θk of the individual current can also be expressed by equation (25).
Figure 0005491210
Figure 0005491210

（２４）式及び（２５）式の分子はそれぞれ全電流及び個別電流の位相基準と同相となる成分（Ｉａ）及び（Ｉｋ）を示している。そしてこれ等は同相Ｉ演算回路７４Ａで演算されて位相差演算回路７６に与えられる。そして位相差演算回路７６によって（２４）式及び（２５）式が演算され、結果として位相差Δθｋ
を求めることが可能となる。 The numerators of the equations (24) and (25) indicate the components (Ia) and (Ik) that are in phase with the phase reference of the total current and the individual current, respectively. These are calculated by the in-phase I calculation circuit 74 A and given to the phase difference calculation circuit 76. Then, the phase difference calculation circuit 76 calculates the equations (24) and (25), and as a result, the phase difference Δθk.
Can be obtained.

以上より、電源周波数（インバータ装置１の出力電圧）と同じ位相基準θｓを位相基準回路７１２から出力することにより、電圧検出器８を省略することが可能となる。   As described above, by outputting the same phase reference θs as the power supply frequency (the output voltage of the inverter device 1) from the phase reference circuit 712, the voltage detector 8 can be omitted.

尚、同相Ｉ演算回路７４Ａ、実効値演算回路７５は必ずしも独立して設ける必要はなく、位相差演算回路７６にこれ等の機能を統合させるように構成しても良い。   The in-phase I calculation circuit 74A and the effective value calculation circuit 75 are not necessarily provided independently, and may be configured to integrate these functions into the phase difference calculation circuit 76.

図８は本発明の実施例６に係る交流電動機の監視装置の回路構成図である。この実施例６の各部について、図１の本発明の実施例１に係る交流電動機の監視装置の回路構成図の各部と同一部分は同一符号で示し、その説明は省略する。この実施例６が実施例１と異なる点は、ヒステリシスモータ３のうち組をなす複数のヒステリシスモータ３（３１と３２、３ｎ−１と３ｎなど）の合成電流を個別電流検出器で検出する構成とした点である。   FIG. 8 is a circuit configuration diagram of an AC motor monitoring apparatus according to Embodiment 6 of the present invention. Regarding the respective parts of the sixth embodiment, the same parts as those in the circuit configuration diagram of the monitoring apparatus for an AC motor according to the first embodiment of the present invention shown in FIG. The difference between the sixth embodiment and the first embodiment is that the combined current of a plurality of hysteresis motors 3 (31 and 32, 3n-1 and 3n, etc.) of the hysteresis motor 3 is detected by an individual current detector. This is the point.

図１の実施例１の場合は、個別電流検出器５で検出するヒステリシスモータは１台であるが、図８の実施例６の場合は、例えば２台のヒステリシスモータの監視を一括して行っている。電流位相差による異常検出は従来の絶対値による検出に比べて、精度を向上できるので、複数のヒステリシスモータの同相の電線を一括して、個別電流検出器５に貫通させることにより、複数台の一括検出が可能となる。この実施例による異常監視は、組を構成するヒステリシスモータの少なくとも何れか１台が異常となったことを検出する。図８では一括検出の台数を２台としているが、台数増加による検出精度の低下が問題とならない場合は、２台以上の検出も可能となる。   In the case of the first embodiment shown in FIG. 1, only one hysteresis motor is detected by the individual current detector 5. However, in the case of the sixth embodiment shown in FIG. 8, for example, two hysteresis motors are monitored all at once. ing. Anomaly detection based on the current phase difference can improve accuracy compared to the detection based on the conventional absolute value. By passing the same-phase wires of a plurality of hysteresis motors through the individual current detectors 5 at once, Batch detection is possible. The abnormality monitoring according to this embodiment detects that at least one of the hysteresis motors constituting the group has become abnormal. In FIG. 8, the number of batch detection is two, but if a decrease in detection accuracy due to the increase in the number does not matter, two or more detections are possible.

このように実施例６によれば、個別電流検出器５の数量を減らして組を構成する複数台のヒステリシスモータの異常監視を行なうことが可能となる。   As described above, according to the sixth embodiment, it is possible to monitor abnormality of a plurality of hysteresis motors constituting the set by reducing the number of the individual current detectors 5.

以上説明した実施例１乃至実施例６は、必要に応じてこれ等を組み合わせて実施しても良いことは明らかである。   It is obvious that the first to sixth embodiments described above may be implemented by combining them as necessary.

１ インバータ装置
２（２１、２２、・・・、２ｎ） 個別開閉器
３（３１、３２、・・・、３ｎ） ヒステリシスモータ
４ 全電流検出器
５（５１、５２、・・・、５ｎ） 個別電流検出器
６ 電圧検出器
７ 監視回路
７１ 切替回路
７２ 保持回路
７３ ＡＤ変換回路
７４ 電力演算回路
７４Ａ 同相Ｉ演算回路
７５ 実効値演算回路
７６ 位相差演算回路
７７ 異常判定回路
７８ 位相補正回路
７９ 設定補正回路
７１０ 平均値回路
７１１ ＨＭ選択回路
７１２ 位相基準回路 1 Inverter device 2 (21, 22, ..., 2n) Individual switch 3 (31, 32, ..., 3n) Hysteresis motor 4 Total current detector 5 (51, 52, ..., 5n) Individual Current detector 6 Voltage detector 7 Monitoring circuit 71 Switching circuit 72 Holding circuit 73 AD conversion circuit 74 Power calculation circuit 74A In-phase I calculation circuit 75 Effective value calculation circuit 76 Phase difference calculation circuit 77 Abnormality determination circuit 78 Phase correction circuit 79 Setting correction Circuit 710 Average value circuit 711 HM selection circuit 712 Phase reference circuit

Claims (6)

共通の交流電源に対して並列接続された複数の交流電動機の異常を監視する交流電動機の監視装置であって、
前記交流電源の電圧を検出する電圧検出手段と、
前記各交流電動機の各々に流れる個別電流を検出する個別電流検出手段と、
前記交流電動機全体に流れる全電流を検出する全電流検出手段と、
前記電圧検出手段並びに前記個別電流検出手段及び前記全電流検出手段の出力から各々の個別の電力及び全体の電力を演算する電力演算手段と、
前記電圧検出手段、前記個別電流検出手段及び前記全電流検出手段の出力からそれぞれの実効値を演算する実効値演算手段と、
前記電力演算手段と前記実効値演算手段の出力から、前記全電流と前記個別電流の各々の位相差を演算する位相差演算手段と
を備え、
前記各々の位相差が前記交流電動機によって定められた異常判定レベルを超えたとき、前記交流電動機が異常であると判定することを特徴とする交流電動機の監視装置。 An AC motor monitoring device that monitors an abnormality of a plurality of AC motors connected in parallel to a common AC power source,
Voltage detection means for detecting the voltage of the AC power supply;
Individual current detecting means for detecting individual current flowing through each of the AC motors;
A total current detecting means for detecting a total current flowing in the entire AC motor;
Power calculating means for calculating each individual power and the total power from the outputs of the voltage detecting means and the individual current detecting means and the total current detecting means;
An effective value calculating means for calculating an effective value from outputs of the voltage detecting means, the individual current detecting means and the total current detecting means;
Phase difference calculation means for calculating the phase difference of each of the total current and the individual current from the outputs of the power calculation means and the effective value calculation means,
The AC motor monitoring device, wherein when each of the phase differences exceeds an abnormality determination level determined by the AC motor, the AC motor is determined to be abnormal. 共通の交流電源に対して並列接続された複数の交流電動機の異常を監視する交流電動機の監視装置であって、
前記交流電源の電圧を検出する電圧検出手段と、
前記各交流電動機の各々に流れる個別電流を検出する個別電流検出手段と、
前記個別電流検出手段の出力の平均値を検出する平均電流検出手段と、
前記電圧検出手段並びに前記個別電流検出手段及び前記平均電流検出手段の出力から各々の個別の電力及び全体の電力を演算する電力演算手段と、
前記電圧検出手段、前記個別電流検出手段及び前記平均電流検出手段の出力からそれぞれの実効値を演算する実効値演算手段と、
前記電力演算手段と前記実効値演算手段の出力から、前記平均電流と前記個別電流の各々の位相差を演算する位相差演算手段と
を備え、
前記各々の位相差が前記交流電動機によって定められた異常判定レベルを超えたとき、前記交流電動機が異常であると判定することを特徴とする交流電動機の監視装置。 An AC motor monitoring device that monitors an abnormality of a plurality of AC motors connected in parallel to a common AC power source,
Voltage detection means for detecting the voltage of the AC power supply;
Individual current detecting means for detecting individual current flowing through each of the AC motors;
Average current detection means for detecting an average value of the output of the individual current detection means;
Power calculating means for calculating each individual power and the total power from the outputs of the voltage detecting means and the individual current detecting means and the average current detecting means;
An effective value calculating means for calculating an effective value from outputs of the voltage detecting means, the individual current detecting means and the average current detecting means;
Phase difference calculation means for calculating the phase difference between the average current and the individual current from the outputs of the power calculation means and the effective value calculation means,
The AC motor monitoring device, wherein when each of the phase differences exceeds an abnormality determination level determined by the AC motor, the AC motor is determined to be abnormal. 監視対象の交流電動機を選択する交流電動機選択手段を更に備え、
前記平均電流検出手段は、
前記交流電動機選択手段によって選択された交流電動機を除く前記交流電動機の前記個別電流検出手段の出力の平均値を求めるようにしたことを特徴とする請求項２に記戴の交流電動機の監視装置。 An AC motor selection means for selecting an AC motor to be monitored;
The average current detecting means includes
3. The AC motor monitoring apparatus according to claim 2, wherein an average value of the outputs of the individual current detecting means of the AC motor excluding the AC motor selected by the AC motor selecting means is obtained. 前記交流電動機及び前記個別電流検出手段の特性のばらつきにより発生する個別電流位相差を補正する補正手段を設け、前記個別電流の各々の位相差の補正を行なうようにしたことを特徴とする請求項１乃至請求項３のいずれか１項に記戴の交流電動機の監視装置。 The correction means for correcting an individual current phase difference generated due to variations in characteristics of the AC motor and the individual current detection means is provided to correct each phase difference of the individual current. The AC motor monitoring device according to any one of claims 1 to 3 . 前記交流電動機の運転台数に応じて前記異常判定レベルを補正する設定補正手段を有することを特徴とする請求項１乃至請求項４のいずれか１項に記戴の交流電動機の監視装置。 The ac motor setting correcting means monitoring device according to claim 1 or Ki戴of the AC motor to any one of claims 4, characterized in that it has a for correcting the abnormality determination level in accordance with the number of operating. 前記個別電流検出手段は、
前記交流電動機のうち、組をなす複数の交流電動機に流れる電流の和を検出するようにし、
前記各々の位相差が前記交流電動機の組によって定められた異常判定レベルを超えたとき、前記交流電動機の組に属するいずれかの交流電動機が異常であると判定することを特徴とする請求項１乃至請求項５のいずれか１項に記戴の交流電動機の監視装置。 The individual current detecting means includes
Among the AC motors, the sum of currents flowing through a plurality of AC motors forming a set is detected,
The one of the AC motors belonging to the set of AC motors is determined to be abnormal when each of the phase differences exceeds an abnormality determination level determined by the set of AC motors. The monitoring apparatus of the alternating current motor described in any one of thru | or 5 thru | or 5 .
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