JP2017184569A - Method for determining characteristic feature quantity of three-phase induction motor - Google Patents

Method for determining characteristic feature quantity of three-phase induction motor Download PDF

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JP2017184569A
JP2017184569A JP2016072437A JP2016072437A JP2017184569A JP 2017184569 A JP2017184569 A JP 2017184569A JP 2016072437 A JP2016072437 A JP 2016072437A JP 2016072437 A JP2016072437 A JP 2016072437A JP 2017184569 A JP2017184569 A JP 2017184569A
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frequency
induction motor
phase induction
sidebands
sideband
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JP6062588B1 (en
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信芳 劉
Xinfang Liu
信芳 劉
芳 馮
Fang Feng
芳 馮
孝博 中村
Takahiro Nakamura
孝博 中村
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Takada Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/12—Asynchronous induction motors for multi-phase current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage

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  • Engineering & Computer Science (AREA)
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  • Control Of Ac Motors In General (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
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Abstract

PROBLEM TO BE SOLVED: To provide a method for determining a characteristic feature quantity of a three-phase induction motor required for calculating a deterioration parameter used for diagnosis of a rotary mechanical system using a three-phase induction motor as a driving source.SOLUTION: The method of determining a characteristic feature quantity of a three-phase induction motor includes: a first step of performing frequency analysis of an operating current signal of a three-phase induction motor 12; a second step of detecting sidebands S, Sexisting in a frequency domain A on a low frequency side and the in a frequency domain B on a high frequency side with respect to a power frequency spectrum Sas a center from a frequency analysis; and a third step of making an absolute value of a difference between a peak position frequency of either sideband S, Sand the power supply frequency fto be the actual rotation frequency fof the three-phase induction motor 12. The actual rotation frequency fis taken as a first characteristic feature quantity.SELECTED DRAWING: Figure 1

Description

本発明は、三相誘導電動機を駆動源とする回転機械系の稼働時の状態を、三相誘導電動機の稼働時電流信号の解析から得られる劣化パラメータを用いて診断する際に、劣化パラメータの算出に必要な三相誘導電動機の固有特徴量を決定する方法に関する。 When diagnosing the operating state of a rotating machine system using a three-phase induction motor as a drive source using the deterioration parameter obtained from the analysis of the current signal during operation of the three-phase induction motor, The present invention relates to a method for determining a characteristic feature of a three-phase induction motor necessary for calculation.

従来、三相誘導電動機を駆動源とする回転機械系の状態診断は、回転機械系から発生する振動の時間領域と周波数（振動数）領域の双方でそれぞれ定義される劣化パラメータに注目することにより行なわれている。しかし、遠隔地に存在する回転機械系や、近づくことができない場所に設置された回転機械系の状態診断では、回転機械系の振動を直接計測することができない。そこで、三相誘導電動機の稼働時電流信号を周波数解析して得られる電流スペクトル（スペクトルパターン）から劣化パラメータを決定し、劣化パラメータの変化に注目することにより、回転機械系の状態診断を行っている（例えば、非特許文献１参照）。 Conventionally, state diagnosis of a rotary machine system using a three-phase induction motor as a drive source is based on focusing on deterioration parameters defined in both the time domain and frequency (frequency) domain of vibration generated from the rotary machine system. It is done. However, in the state diagnosis of a rotating machine system existing in a remote place or a rotating machine system installed in an inaccessible place, vibrations of the rotating machine system cannot be directly measured. Therefore, the deterioration parameter is determined from the current spectrum (spectrum pattern) obtained by frequency analysis of the operating current signal of the three-phase induction motor, and the state of the rotating machine system is diagnosed by paying attention to the change of the deterioration parameter. (For example, refer nonpatent literature 1).

豊田利夫、「電流徴候解析ＭＣＳＡによる電動機駆動回転機の診断技術」、高田技報、２０１０年、第２０巻、ｐ．３−６Toshio Toyoda, “Diagnosis technology for motor-driven rotating machines by current sign analysis MCSA”, Takada Technical Report, 2010, Vol. 20, p. 3-6

例えば、極数ｐの三相誘導電動機の稼働時電流信号の周波数解析から得られる電流スペクトルには、図４に示すように、電源周波数ｆｌｉｎｅ（商用電源の周波数）のスペクトルの両側（電源周波数ｆｌｉｎｅのスペクトルを中心として低周波数側と高周波数側）に、ポール通過周波数ｆｐｐに起因する側帯波が存在することが知られている。そこで、ポール通過周波数ｆｐｐに起因する側帯波の大きさ（電流パワー値、ピーク高さ、以下同じ）Ｉｐｏｌｅに対する電源周波数ｆｌｉｎｅのスペクトルの大きさＩｌｉｎｅの相対比Ｉｌｉｎｅ／Ｉｐｏｌｅを劣化パラメータとして、劣化パラメータの変化から三相誘導電動機の回転子バーに損傷が生じているか否かを判定している。 For example, the current spectrum obtained from the frequency analysis of the operating current signal of the three-phase induction motor having the number of poles p has both sides of the spectrum of the power supply frequency f line (commercial power supply frequency) as shown in FIG. It is known that sidebands caused by the pole passing frequency f pp exist on the low frequency side and the high frequency side centering on the f line spectrum. Therefore, the relative ratio I line / I pole of the spectrum size I line of the power source frequency f line with respect to the magnitude of the sideband wave (current power value, peak height, the same applies hereinafter) I pole caused by the pole passing frequency f pp As the deterioration parameter, it is determined whether or not the rotor bar of the three-phase induction motor is damaged from the change of the deterioration parameter.

ここで、ポール通過周波数ｆｐｐ、三相誘導電動機の回転子の実回転周波数ｆｒ（以後、実回転周波数ｆｒとは回転子の実回転周波数ｆｒをいう）、三相誘導電動機の同期回転周波数ｆｘ、及び三相誘導電動機の極数ｐの間にはｆｐｐ＝（ｆｘ−ｆｒ）ｐの関係が成立する。また、極数ｐは三相誘導電動機の仕様で決まり、同期回転周波数ｆｘは、電源周波数ｆｌｉｎｅ（商用電源の周波数）と極数ｐを用いて求めることができる。このため、三相誘導電動機の実回転周波数ｆｒを測定することができれば、電流スペクトル中のポール通過周波数ｆｐｐに起因する側帯波が特定でき、側帯波の正確な大きさが判明して正確な劣化パラメータを求めることができる。しかしながら、三相誘導電動機の実回転周波数ｆｒが不明の場合は、推定値（例えば、以前に測定した値や仕様書に記載の値）を用いることになって、正確な劣化パラメータを求めることができず、回転機械系の状態を正しく診断できないという問題が生じる。 Here, the pole pass frequency f pp, three-phase induction motor of the actual rotational frequency f r of the rotor (hereinafter, the actual rotational frequency f r refers to the actual rotational frequency f r of the rotor), the three-phase induction motor synchronization rotation frequency f x, and between the pole p of the three-phase induction motor f pp = (f x -f r ) relationship p is established. Further, determined by the specification of the number of poles p is three-phase induction motor, synchronous rotation frequency f x can be determined using the power frequency f line (commercial power frequency) and the number of poles p. Therefore, if it is possible to measure the actual rotational frequency f r of the three-phase induction motor, can isolate sidebands due to pole passing frequency f pp in current spectrum, precisely it has been found correct size sidebands Can be obtained. However, if the actual rotational frequency f r of the three-phase induction motor is unknown, estimates (e.g., a value according to the value and specifications previously measured) supposed to use, obtaining an accurate deterioration parameter This causes a problem that the state of the rotating machine system cannot be correctly diagnosed.

本発明はかかる事情に鑑みてなされたもので、三相誘導電動機を駆動源とする回転機械系の状態を、三相誘導電動機の稼働時電流信号の解析から得られる劣化パラメータを用いて診断する際に、劣化パラメータの算出に必要な三相誘導電動機の固有特徴量を決定する方法を提供することを目的とする。 The present invention has been made in view of such circumstances, and diagnoses the state of a rotary machine system using a three-phase induction motor as a drive source by using deterioration parameters obtained from analysis of current signals during operation of the three-phase induction motor. In this case, an object of the present invention is to provide a method for determining a characteristic feature amount of a three-phase induction motor necessary for calculating a deterioration parameter.

前記目的に沿う本発明に係る三相誘導電動機の固有特徴量を決定する方法は、三相誘導電動機を駆動源とする回転機械系の稼働時の状態を診断する際に必要な三相誘導電動機の固有特徴量を決定する方法であって、
前記三相誘導電動機の稼働時電流信号を計測し、該稼働時電流信号の周波数解析を行う第１工程と、
前記周波数解析から得られた電流スペクトルの中から、前記三相誘導電動機の電源周波数スペクトルの側帯波であって、電源周波数ｆｌｉｎｅと前記三相誘導電動機の同期回転周波数ｆＸとの差の値を下限周波数、該下限周波数に０．０１〜４Ｈｚの範囲で設定される周波数値を加えた値を上限周波数とする周波数領域Ａに存在する最大高さのピークを求めて側帯波ＳＡとし、前記電源周波数ｆｌｉｎｅに前記同期回転周波数ｆＸを加えた値を上限周波数、該上限周波数から０．０１〜４Ｈｚの範囲で設定される周波数値を引いた値を下限周波数とする周波数領域Ｂに存在する最大高さのピークを求めて側帯波ＳＢとする第２工程と、
前記側帯波ＳＡ、ＳＢのいずれか一方のピーク位置周波数と前記電源周波数ｆｌｉｎｅの差の絶対値を前記三相誘導電動機の実回転周波数ｆｒとする第３工程とを有し、
前記実回転周波数ｆｒを第１の固有特徴量とする。 The method for determining the characteristic feature amount of the three-phase induction motor according to the present invention that meets the above-described object is a three-phase induction motor that is necessary for diagnosing the operating state of a rotary machine system that uses a three-phase induction motor as a drive source. A method for determining a characteristic feature of
A first step of measuring an operating current signal of the three-phase induction motor and performing a frequency analysis of the operating current signal;
Of the current spectrum obtained from the frequency analysis, a sideband of the power frequency spectrum of the three-phase induction motor, and a value of a difference between the power frequency f line and the synchronous rotation frequency f X of the three-phase induction motor the lower limit frequency, seeking the peak of maximum height the value obtained by adding the frequency value set in the range of 0.01~4Hz the lower limit frequency present in the frequency area a to the upper limit frequency and sidebands S a, In frequency region B, the value obtained by adding the synchronous rotation frequency f X to the power supply frequency f line is the upper limit frequency, and the value obtained by subtracting the frequency value set in the range of 0.01 to 4 Hz from the upper limit frequency is the lower limit frequency. a second step of the sidebands S B seeking the peak of maximum height that is present,
The sideband S A, and a third step of the actual rotational frequency f r of the absolute value the three-phase induction motor of the difference either between one peak position frequency the power supply frequency f line of S B,
The actual rotation frequency fr is set as a first characteristic feature.

本発明に係る三相誘導電動機の固有特徴量を決定する方法においては、回転機械系の稼働時の状態を診断する際に測定する稼働時電流信号から三相誘導電動機の実回転周波数ｆｒを決定して三相誘導電動機の第１の固有特徴量とするので、決定された実回転周波数ｆｒは診断時の三相誘導電動機の回転状態を正確に反映している。このため、実回転周波数ｆｒを用いて回転機械系の稼働時の状態を判定する劣化パラメータを構成すると、劣化パラメータを用いて三相誘導電動機の状態を正確に評価することができ、回転機械系の状態診断の精度向上を図ることが可能になる。
そして、三相誘導電動機の実回転周波数ｆｒは、回転機械系の機械的構造と関連する側帯波の生成に関与するため、回転機械系の機械的構造を反映した劣化パラメータを正確に得ることが可能になる。 In the method of determining the specific characteristics of the three-phase induction motor according to the present invention, the actual rotational frequency f r of the three-phase induction motor from operating when the current signal to be measured when diagnosing the condition during operation of the rotating machine system since the decision to the three-phase first specific feature of the induction motor, the actual rotational frequency f r which is determined accurately reflect the state of rotation of the three-phase induction motor at the time of diagnosis. For this reason, if the deterioration parameter for determining the operating state of the rotating machine system is configured using the actual rotational frequency fr , the state of the three-phase induction motor can be accurately evaluated using the deterioration parameter, and the rotating machine It is possible to improve the accuracy of system status diagnosis.
The actual rotational frequency f r of the three-phase induction motor, in order to participate in the generation of sideband associated with the mechanical structure of the rotary mechanical system, to obtain a degradation parameter that reflects the mechanical structure of the rotary mechanical system accurately Is possible.

三相誘導電動機の稼働時電流信号の電流スペクトルに現れる電源周波数スペクトルと実回転周波数の側帯波の模式図である。It is a schematic diagram of the sideband of the power frequency spectrum and the actual rotational frequency that appear in the current spectrum of the current signal during operation of the three-phase induction motor. 本発明の一実施の形態に係る三相誘導電動機の固有特徴量を決定する方法で使用する装置の構成図である。It is a block diagram of the apparatus used with the method of determining the specific feature-value of the three-phase induction motor which concerns on one embodiment of this invention. 三相誘導電動機の稼働時電流信号の電流スペクトルに現れる電源周波数スペクトルと回転子バーすべり周波数の側帯波の模式図である。It is a schematic diagram of the sideband of the power supply frequency spectrum and the rotor bar slip frequency that appear in the current spectrum of the current signal during operation of the three-phase induction motor. 三相誘導電動機の稼働時電流信号の周波数解析から得られる電流スペクトルの模式図である。It is a schematic diagram of the current spectrum obtained from the frequency analysis of the current signal during operation of the three-phase induction motor.

続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態につき説明し、本発明の理解に供する。
本発明の一実施の形態に係る三相誘導電動機の固有特徴量を決定する方法は、三相誘導電動機を駆動源とする回転機械系の稼働時の状態を、三相誘導電動機の稼働時電流信号の解析から得られる劣化パラメータを用いて診断する際に、劣化パラメータの算出に必要な三相誘導電動機の固有特徴量を決定する方法である。以下、詳細に説明する。 Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
The method for determining the characteristic features of a three-phase induction motor according to an embodiment of the present invention is based on the operating state of a rotating machine system using a three-phase induction motor as a drive source. This is a method for determining the characteristic feature of the three-phase induction motor necessary for calculating the deterioration parameter when making a diagnosis using the deterioration parameter obtained from the signal analysis. Details will be described below.

三相誘導電動機の固有特徴量を決定する方法は、三相誘導電動機の稼働時電流信号を計測し、稼働時電流信号の周波数解析を行ない、得られた電流スペクトルの値を対数変換する第１工程と、図１に示すように、対数変換された電流スペクトルの中から、三相誘導電動機の電源周波数スペクトルＳＬの側帯波であって、電源周波数ｆｌｉｎｅと三相誘導電動機の同期回転周波数ｆＸとの差の値を下限周波数、下限周波数に０．０１〜４Ｈｚの範囲で設定される周波数値、例えば２Ｈｚを加えた値を上限周波数とする周波数領域Ａに存在する最大高さのピークを求めて側帯波ＳＡとし、電源周波数ｆｌｉｎｅに同期回転周波数ｆＸを加えた値を上限周波数、上限周波数から０．０１〜４Ｈｚの範囲で設定される周波数値、例えば２Ｈｚを引いた値を下限周波数とする周波数領域Ｂに存在する最大高さのピークを求めて側帯波ＳＢとする第２工程と、側帯波ＳＡ、ＳＢのいずれか一方、例えば、側帯波ＳＡ、ＳＢの中でピーク高さの高い方（電流パワー値の大きな方）のピーク位置周波数と電源周波数ｆｌｉｎｅの差の絶対値を三相誘導電動機の実回転周波数ｆｒとする第３工程とを有し、実回転周波数ｆｒを三相誘導電動機の第１の固有特徴量とする。 The method of determining the characteristic feature of the three-phase induction motor is a first method of measuring the current signal during operation of the three-phase induction motor, performing frequency analysis of the current signal during operation, and logarithmically converting the obtained current spectrum value. process and, as shown in FIG. 1, from the current spectrum to logarithmic transformation, a sideband wave of the power frequency spectrum S L of the three-phase induction motor, synchronous rotation frequency of the power supply frequency f line and the three-phase induction motor value the lower limit frequency of the difference between f X, the frequency value to be set in the range of 0.01~4Hz the lower limit frequency, for example, the maximum height of the peaks present in the frequency area a which the value obtained by adding 2Hz upper limit frequency was a sideband S a seeking, pull power frequency f line in synchronized rotation frequency f X values of the upper limit frequency plus the frequency value set in the range of 0.01~4Hz from the upper limit frequency, for example, a 2Hz A second step of the sidebands S B seeking the peak of maximum height values present in the frequency domain B to the lower limit frequency, sideband S A, either one of the S B, for example, side band S A the third step of the actual rotational frequency f r of the absolute value of the difference between the peak position frequency and supply frequency f line of higher peak height (the larger the current power value) three-phase induction motor in the S B And the actual rotational frequency fr is the first characteristic feature of the three-phase induction motor.

第１工程では、図２に示すように、回転機械系１０の電気盤１１内の三相誘導電動機１２の電動機配線１３の中の任意の１相の配線に対して、例えば、非接触のクランプ式電流センサ１４を用いてアナログ信号である稼働時電流信号を検出する。なお、電気盤１１と回転機械系１０が近接している場合は、三相誘導電動機１２に接続される電源ケーブル１５の中の任意の１相のケーブルに対して、非接触のクランプ式電流センサを用いて稼働時電流信号を検出することもできる。クランプ式電流センサ１４で検出した稼働時電流信号をＡ／Ｄ変換器１６に入力してデジタル信号に変換し、伝送路１７を介して高速フーリエ変換（周波数解析の一例）を行う周波数解析器１８に入力する。これによって、稼働時電流信号の電流スペクトルが得られる。 In the first step, as shown in FIG. 2, for example, a non-contact clamp is applied to any one-phase wiring in the motor wiring 13 of the three-phase induction motor 12 in the electric board 11 of the rotating machine system 10. An operating current signal, which is an analog signal, is detected using the current sensor 14. When the electric board 11 and the rotating machine system 10 are close to each other, a non-contact clamp type current sensor is connected to an arbitrary one-phase cable among the power cables 15 connected to the three-phase induction motor 12. It is also possible to detect the operating current signal using. The operating current signal detected by the clamp type current sensor 14 is input to the A / D converter 16 and converted into a digital signal, and the frequency analyzer 18 that performs fast Fourier transform (an example of frequency analysis) through the transmission path 17. To enter. As a result, a current spectrum of the operating current signal is obtained.

図２に示すように、第２工程は、周波数解析器１８から出力される稼働時電流信号の電流スペクトルのスペクトルデータ（周波数と電流パワー値（ピーク高さ）の関係を示すデータ）を第１のデータ処理手段１９に入力して、第１のデータ処理手段１９により行われる。
第２工程では、先ず、電流スペクトルの中から、三相誘導電動機１２の電源周波数スペクトルＳＬを求める。ここで、電源周波数ｆｌｉｎｅは、三相誘導電動機１２に電力を供給する商用電源周波数（東日本では５０Ｈｚ、西日本では６０Ｈｚ）となるので、電流スペクトルのスペクトルデータの中から、周波数の値が商用電源周波数に一致するスペクトルデータを求め、得られたスペクトルデータが有する電流パワー値を電源周波数スペクトルＳＬの電流パワー値とする（以上、処理１）。 As shown in FIG. 2, in the second step, the spectrum data (data indicating the relationship between the frequency and the current power value (peak height)) of the current spectrum of the operating current signal output from the frequency analyzer 18 is first. Is input to the data processing means 19 and is performed by the first data processing means 19.
In the second step, first, from the current spectrum, obtaining a power frequency spectrum S L of the three-phase induction motor 12. Here, since the power supply frequency f line is a commercial power supply frequency (50 Hz in eastern Japan, 60 Hz in western Japan) that supplies power to the three-phase induction motor 12, the frequency value is determined from the spectral data of the current spectrum. The spectrum data matching the frequency is obtained, and the current power value of the obtained spectrum data is set as the current power value of the power supply frequency spectrum S L (the processing 1).

次いで、三相誘導電動機１２の同期回転周波数ｆＸは、三相誘導電動機１２の極数がｐの場合、ｆＸ＝２ｆｌｉｎｅ／ｐと算出されるので、電流スペクトルの中で、電源周波数ｆｌｉｎｅと三相誘導電動機１２の同期回転周波数ｆＸとの差の値ｆｌｉｎｅ−ｆＸ、即ち、ｆｌｉｎｅ−２ｆｌｉｎｅ／ｐを下限周波数、下限周波数に２Ｈｚを加えた値、即ち、ｆｌｉｎｅ−２ｆｌｉｎｅ／ｐ＋２を上限周波数とする周波数領域Ａに存在するスペクトルデータの中から、電流パワー値が最大（最大高さのピーク、以下同じ）となるスペクトルデータを抽出する。そして、抽出したスペクトルデータの有する周波数と電流パワー値をそれぞれ側帯波ＳＡの周波数と電流パワー値とする（以上、処理２）。
また、電流スペクトルの中で、電源周波数ｆｌｉｎｅに同期回転周波数ｆＸを加えた値ｆｌｉｎｅ＋ｆＸ、即ち、ｆｌｉｎｅ＋２ｆｌｉｎｅ／ｐを上限周波数、上限周波数から２Ｈｚを引いた値、即ち、ｆｌｉｎｅ＋２ｆｌｉｎｅ／ｐ−２を下限周波数とする周波数領域Ｂに存在するスペクトルデータの中から、電流パワー値が最大となるスペクトルデータを抽出する。そして、抽出したスペクトルデータの有する周波数と電流パワー値をそれぞれ側帯波ＳＢの周波数と電流パワー値とする（以上、処理３）。
なお、第１のデータ処理手段１９は、例えば、パーソナルコンピュータに、処理１〜３を実行するプログラムを搭載させることにより構成できる。ここで、商用電源周波数、三相誘導電動機１２の極数ｐの値は予め第１のデータ処理手段１９に入力しておく。 Then, the synchronized rotation frequency f X of the three-phase induction motor 12, when the number of poles of the three-phase induction motor 12 is p, since it is calculated as f X = 2f line / p, in the current spectrum, the power supply frequency f The value f line −f X of the difference between the line and the synchronous rotation frequency f X of the three-phase induction motor 12, that is, f line −2f line / p is the lower limit frequency, and the value obtained by adding 2 Hz to the lower limit frequency, ie, f line Spectrum data having a maximum current power value (maximum height peak, the same applies hereinafter) is extracted from spectrum data existing in the frequency region A having −2f line / p + 2 as the upper limit frequency. Then, the extracted frequency and current power value possessed by the spectral data, respectively the frequency and the current power value of the sideband S A (above, processing 2).
Further, in the current spectrum, a value f line + f X obtained by adding the synchronous rotation frequency f X to the power supply frequency f line , that is, f line + 2f line / p is an upper limit frequency, and a value obtained by subtracting 2 Hz from the upper limit frequency, that is, Spectral data having the maximum current power value is extracted from the spectral data existing in the frequency region B having a lower limit frequency of f line + 2f line / p−2. Then, the extracted frequency and current power value possessed by the spectral data, respectively the frequency and the current power value of the sideband S B (or more, the process 3).
Note that the first data processing means 19 can be configured, for example, by mounting a program for executing the processes 1 to 3 on a personal computer. Here, the commercial power supply frequency and the value of the number of poles p of the three-phase induction motor 12 are input to the first data processing means 19 in advance.

図２に示すように、第３工程は、第１のデータ処理手段１９から出力される側帯波ＳＡのデータ（側帯波ＳＡの電流パワー値と電流パワー値に対応する周波数ｆＡ）と側帯波ＳＢのデータ（側帯波ＳＢの電流パワー値と電流パワー値に対応する周波数ｆＢ）を第２のデータ処理手段２０に入力して第２のデータ処理手段２０により行われる。
第３工程では、側帯波ＳＡの電流パワー値と側帯波ＳＢの電流パワー値を比較して、電流パワー値の大きな側帯波を特定し、特定した側帯波のピーク位置周波数ｆＳｍａｘを求める。そして、ピーク位置周波数ｆＳｍａｘと電源周波数ｆｌｉｎｅの差の絶対値｜ｆＳｍａｘ−ｆｌｉｎｅ｜を三相誘導電動機１２の実回転周波数ｆｒとする。例えば、側帯波ＳＡの電流パワー値が側帯波ＳＢの電流パワー値より大きな場合はｆｒ＝ｆｌｉｎｅ−ｆＡ、側帯波ＳＢの電流パワー値が側帯波ＳＡの電流パワー値より大きな場合はｆｒ＝ｆＢ−ｆｌｉｎｅとする。なお、求めた実回転周波数ｆｒは第２のデータ処理手段２０より出力される。（処理４）。
ここで、第２のデータ処理手段２０は、例えば、パーソナルコンピュータに、処理４を実行するプログラムを搭載させることにより構成できる。 As shown in FIG. 2, in the third step, the data of the sideband wave S A output from the first data processing means 19 (the current power value of the sideband wave S A and the frequency f A corresponding to the current power value) and performed by sidebands S B of the data the second data processing means 20 is input to the second data processing means 20 (sidebands S B of the current power value and current frequency f B corresponding to the power value).
In the third step, the current power value of the sideband wave S A and the current power value of the sideband wave S B are compared to identify a sideband wave having a large current power value, and the peak position frequency f Smax of the identified sideband wave is obtained. . Then, the absolute value of the difference between the peak position frequency f Smax and the power frequency f line | and the three-phase induction actual rotational frequency f r of the motor 12 | f Smax -f line. For example, when the current power value of the sideband wave S A is larger than the current power value of the sideband wave S B , f r = f line −f A , and the current power value of the side band wave S B is greater than the current power value of the side band wave S A. If it is large, it is assumed that f r = f B −f line . The obtained actual rotation frequency fr is output from the second data processing means 20. (Process 4).
Here, the 2nd data processing means 20 can be comprised by mounting the program which performs the process 4 on a personal computer, for example.

本実施の形態に係る三相誘導電動機の固有特徴量を決定する方法は、同期回転周波数ｆＸと実回転周波数ｆｒとの差をすべり周波数ｆｓとする第４工程と、電流スペクトルの中から、電源周波数スペクトルの側帯波であって、すべり周波数ｆｓと三相誘導電動機１２の極数ｐの積として定義されるポール通過周波数ｆｐｐに起因して低周波数側及び高周波数側にそれぞれ存在する側帯波ＳＰＡ（ピーク周波数位置ｆＰＡ）、側帯波ＳＰＢ（ピーク周波数位置ｆＰＢ）を求める第５工程と、側帯波ＳＰＡと側帯波ＳＡの間に存在する最大高さのピークを求めて側帯波ＳＬＡとし、側帯波ＳＰＢと側帯波ＳＢの間に存在する最大高さのピークを求めて側帯波ＳＬＢとする第６工程と、側帯波ＳＬＡ、ＳＬＢのいずれか一方、例えば、側帯波ＳＬＡ、ＳＬＢの中でピーク高さの高い方のピーク位置周波数と電源周波数ｆｌｉｎｅの差の絶対値を三相誘導電動機１２の回転子バーすべり周波数ｆｒｓとする第７工程と、回転子バーすべり周波数ｆｒｓをすべり周波数ｆｓで除して三相誘導電動機１２の回転子バー本数ｈとする第８工程とを更に有し、回転子バー本数ｈを三相誘導電動機１２の第２の固有特徴量とする。 Method for determining specific characteristics of the three-phase induction motor according to the present embodiment, a fourth step of the difference of the slip frequency f s of the synchronous rotary frequency f X and the actual rotational frequency f r, in the current spectrum from a side band of the power frequency spectrum, the slip frequency f s and the three-phase induction motor 12 respectively due to the pole pass frequencies f pp is defined as the product of the number of poles p in the low frequency side and high frequency side of the present sideband S PA (peak frequency position f PA), a fifth step of obtaining the sideband S PB (peak frequency position f PB), the maximum height that exists between the sidebands S PA and sidebands S a a sideband S LA seeking peak, and a sixth step of the sidebands S LB seeking the peak of maximum height that exists between the sidebands S PB and sideband S B, sideband S LA, S LB Either one, for example In the seventh step, the absolute value of the difference between the peak position frequency having the higher peak height in the sidebands S LA and S LB and the power supply frequency f line is set as the rotor bar slip frequency frs of the three-phase induction motor 12. And an eighth step of dividing the rotor bar slip frequency f rs by the slip frequency f s to obtain the number of rotor bars h of the three-phase induction motor 12, and the number of rotor bars h is set to the three-phase induction motor. Twelve second characteristic features are assumed.

図２に示すように、第４工程〜第８工程は、第１工程で得られる（周波数解析器１８から出力される）稼働時電流信号の電流スペクトルのスペクトルデータと、第２工程で得られる（第１のデータ処理手段１９から取得する）側帯波ＳＬＡ、ＳＬＢのデータ及び三相誘導電動機１２の同期回転周波数ｆＸと、第３工程で得られる（第２のデータ処理手段２０から取得する）実回転周波数ｆｒを第３のデータ処理手段２１に入力して第３のデータ処理手段２１により行われる。 As shown in FIG. 2, the fourth to eighth steps are obtained in the first step and obtained in the second step, and the spectrum data of the current spectrum of the operating current signal (output from the frequency analyzer 18). The data of the sidebands S LA and S LB (obtained from the first data processing means 19) and the synchronous rotation frequency f X of the three-phase induction motor 12 are obtained in the third step (from the second data processing means 20). The actual rotation frequency fr is acquired and input to the third data processing means 21, which is performed by the third data processing means 21.

第４工程では、第１、第２のデータ処理手段１９、２０からそれぞれ取得する同期回転周波数ｆＸと実回転周波数ｆｒから差ｆＸ−ｆｒを求めて、すべり周波数ｆｓとする（処理５）。
第５工程では、図３に示すように、すべり周波数ｆｓと三相誘導電動機１２の極数ｐの積として定義されるポール通過周波数ｆｐｐに起因して、即ち、三相誘導電動機１２の電源周波数ｆｌｉｎｅの電流スペクトルピークを中心とし、ポール通過周波数ｆｐｐ分だけ低周波数側及び高周波数側にそれぞれ離れた周波数位置に存在する側帯波ＳＰＡ（ピーク周波数位置ｆＰＡ）、側帯波ＳＰＢ（ピーク周波数位置ｆＰＢ）を求め、第６工程では、側帯波ＳＰＡと側帯波ＳＡの間に存在する最大高さのピークを求めて（即ち、側帯波ＳＰＡと側帯波ＳＡの間に存在するスペクトルデータの中から、電流パワー値が最大となるスペクトルデータを抽出して）、抽出したスペクトルデータの有する周波数と電流パワー値をそれぞれ側帯波ＳＬＡのピーク周波数ｆＬＡと電流パワー値とし、側帯波ＳＰＢと側帯波ＳＢの間に存在する最大高さのピークを求めて（即ち、側帯波ＳＰＢと側帯波ＳＢの間に存在するスペクトルデータの中から、電流パワー値が最大となるスペクトルデータを抽出して）、抽出したスペクトルデータの有する周波数と電流パワー値をそれぞれ側帯波ＳＬＢのピーク周波数ｆＬＢと電流パワー値とする（以上、処理６）。 In the fourth step, first, by obtaining a difference f X -f r from the synchronized rotation frequency f X and the actual rotational frequency f r to get from each of the second data processing means 19 and 20, the slip frequency f s ( Process 5).
In the fifth step, as shown in FIG. 3, due to the pole passing frequency f pp defined as the product of the slip frequency f s and the number of poles p of the three-phase induction motor 12, that is, Sideband wave S PA (peak frequency position f PA ) and sideband wave S present at frequency positions centered on the current spectrum peak of power supply frequency f line and separated by the pole passing frequency f pp on the low frequency side and the high frequency side, respectively. seeking PB (peak frequency position f PB), in the sixth step, seeking the peak of maximum height that exists between the sidebands S PA and sideband S a (i.e., sidebands S PA and sidebands S a The spectrum data having the maximum current power value is extracted from the spectrum data existing between the frequency and current power value of the extracted spectrum data. A peak frequency f LA and the current power value of the LA, seeking the peak of maximum height that exists between the sidebands S PB and sideband S B (i.e., exist between the sidebands S PB and sidebands S B from the spectral data, the current power value by extracting spectral data having the largest), and extracted frequency and current power value possessed by the spectral data and peak frequency f LB and the current power value of each sideband S LB (Processing 6).

第７工程では、側帯波ＳＬＡ、ＳＬＢのいずれか一方、例えば、側帯波ＳＬＡの電流パワー値と側帯波ＳＬＢの電流パワー値を比較して、電流パワー値の大きな側帯波を特定し、特定した側帯波のピーク位置周波数を求める。そして、求めたピーク位置周波数と電源周波数ｆｌｉｎｅの差の絶対値を三相誘導電動機１２の回転子バーすべり周波数ｆｒｓとする。例えば、側帯波ＳＬＡの電流パワー値が側帯波ＳＬＢの電流パワー値より大きな場合はｆｒｓ＝ｆｌｉｎｅ−ｆＬＡ、側帯波ＳＬＢの電流パワー値が側帯波ＳＬＡの電流パワー値より大きな場合はｆｒｓ＝ｆＬＢ−ｆｌｉｎｅとする（処理７）。第８工程では、第７工程で得られた回転子バーすべり周波数ｆｒｓを、第４工程で得られたすべり周波数ｆｓ（＝ｆＸ−ｆｒ）で除した値を求め、求めた値に最も近い整数値を三相誘導電動機１２の回転子バー本数ｈとする（処理８）。
ここで、第３のデータ処理手段２１は、例えば、パーソナルコンピュータに、処理５〜８を実行するプログラムを搭載させることにより構成できる。 In the seventh step, whereas one sideband S LA, the S LB, for example, by comparing the current power value of the current power value and sideband S LB sidebands S LA, specifying a large sideband current power value Then, the peak position frequency of the specified sideband is obtained. Then, the absolute value of the difference between the obtained peak position frequency and the power supply frequency f line is set as the rotor bar slip frequency frs of the three-phase induction motor 12. For example, when the current power value of the sideband wave S LA is larger than the current power value of the sideband wave S LB , f rs = f line −f LA , and the current power value of the side band wave S LB is larger than the current power value of the side band wave S LA. If it is larger, f rs = f LB −f line (process 7). In the eighth step, the value obtained by dividing the rotor bar slip frequency f rs obtained in the seventh step by the slip frequency f s (= f X −f r ) obtained in the fourth step is obtained. Is set to the number h of rotor bars of the three-phase induction motor 12 (process 8).
Here, the 3rd data processing means 21 can be comprised by mounting the program which performs the process 5-8 on a personal computer, for example.

以上説明したように、三相誘導電動機１２の稼働時電流信号の周波数解析を行って得られた電流スペクトルに対して、本発明の三相誘導電動機の固有特徴量を決定する方法を適用することにより、三相誘導電動機１２の実回転周波数ｆｒを決定して、三相誘導電動機１２の第１の固有特徴量とすることができる。その結果、実回転周波数ｆｒ、三相誘導電動機１２の同期回転周波数ｆＸ、及び三相誘導電動機１２の極数ｐを用いてポール通過周波数ｆｐｐ（＝（ｆＸ−ｆｒ）ｐ）を求めることができ、電流スペクトルの中からポール通過周波数ｆｐｐの側帯波を特定することができる。これにより、ポール通過周波数ｆｐｐの側帯波の正確な大きさ（電流パワー値）２０ｌｏｇＩｐｏｌｅ（ここで、Ｉｐｏｌｅは、三相誘導電動機１２の稼働時電流信号を高速フーリエ変換して得られるポール通過周波数ｆｐｐに起因する側帯波の電流パワー値）が分かり、例えば、ポール通過周波数ｆｐｐの側帯波の大きさ２０ｌｏｇＩｐｏｌｅと電源周波数ｆｌｉｎｅのスペクトルの大きさ２０ｌｏｇＩｌｉｎｅ（ここで、Ｉｌｉｎｅは、三相誘導電動機１２の稼働時電流信号を高速フーリエ変換して得られる電源周波数の電流スペクトルの電流パワー値）を用いて構成される２０ｌｏｇＩｌｉｎｅ−２０ｌｏｇＩｐｏｌｅ、即ち、２０ｌｏｇ（Ｉｌｉｎｅ／Ｉｐｏｌｅ）を劣化パラメータとすることで、劣化パラメータの変化から三相誘導電動機１２の回転子バーに損傷が生じているか否かを精度よく診断することができる。 As described above, the method for determining the characteristic features of the three-phase induction motor of the present invention is applied to the current spectrum obtained by performing frequency analysis of the current signal during operation of the three-phase induction motor 12. Accordingly, it is possible to determine the actual rotational frequency f r of the three-phase induction motor 12, the first specific feature of the three-phase induction motor 12. As a result, using the actual rotation frequency f r , the synchronous rotation frequency f X of the three-phase induction motor 12, and the number of poles p of the three-phase induction motor 12, the pole passing frequency f pp (= (f X −f r ) p). And the sideband of the pole passing frequency f pp can be identified from the current spectrum. Thereby, the exact magnitude (current power value) of the sideband of the pole passing frequency f pp is 20 log I pole (where I pole is a pole obtained by fast Fourier transforming the current signal during operation of the three-phase induction motor 12) The sideband current power value caused by the pass frequency f pp is known. For example, the sideband wave size 20 logI pole of the pole pass frequency f pp and the spectrum size 20 logI line (where I line is the power line frequency f line). is, 20logI line -20logI pole constructed using the operation time current signal of the three-phase induction motor 12 current power value of the current spectrum of the power supply frequency obtained by fast Fourier transform), i.e., 20log (I line / I pole )) is used as a deterioration parameter. Therefore, it can be accurately diagnosed whether or not the rotor bar of the three-phase induction motor 12 is damaged.

また、三相誘導電動機１２の稼働時電流信号の電流スペクトルに対して、本発明の三相誘導電動機の固有特徴量を決定する方法を適用することにより、三相誘導電動機１２の回転子バーの本数ｈを決定して、三相誘導電動機１２の第２の固有特徴量とすることができる。その結果、回転子バーの本数ｈ、実回転周波数ｆｒ、及び三相誘導電動機１２の同期回転周波数ｆＸを用いて、回転子バーすべり周波数ｆｒｓ（＝（ｆＸ−ｆｒ）ｈ）を求めることができ、電流スペクトルの中から、電源周波数スペクトルの側帯波であって、回転子バーすべり周波数ｆｒｓに起因する側帯波を特定することができる。これにより、回転子バーすべり周波数ｆｒｓに起因する側帯波の正確な大きさ２０ｌｏｇＩｒｓ（Ｉｒｓは、三相誘導電動機１２の稼働時電流信号を高速フーリエ変換して得られる回転子バーすべり周波数ｆｒｓに起因する側帯波の電流パワー値）が分かり、例えば、回転子バーすべり周波数ｆｒｓに起因する側帯波の大きさ２０ｌｏｇＩｒｓと電源周波数ｆｌｉｎｅのスペクトルの大きさＩｌｉｎｅを用いて構成される２０ｌｏｇＩｌｉｎｅ−２０ｌｏｇＩｒｓ、即ち、２０ｌｏｇ（Ｉｌｉｎｅ／Ｉｒｓ）を劣化パラメータとすることで、劣化パラメータの変化から三相誘導電動機１２の負荷トルクに変化が生じているか否かを精度よく診断することができる。 Further, by applying the method for determining the characteristic feature of the three-phase induction motor of the present invention to the current spectrum of the current signal of the three-phase induction motor 12 during operation, the rotor bar of the three-phase induction motor 12 The number h can be determined and used as the second characteristic feature of the three-phase induction motor 12. As a result, by using the number of rotor bars h, the actual rotational frequency f r, and a synchronized rotation frequency f X of the three-phase induction motor 12, rotor bars slip frequency f rs (= (f X -f r) h) From the current spectrum, the sideband wave of the power supply frequency spectrum, which is caused by the rotor bar slip frequency frs , can be identified. As a result, the exact magnitude of the sideband 20 logI rs (I rs is the rotor bar slip frequency obtained by fast Fourier transform of the operating current signal of the three-phase induction motor 12 due to the rotor bar slip frequency f rs. f current power value of sidebands caused by rs) found, for example, constructed using magnitude I line of the spectrum of size 20LogI rs and the power frequency f line sidebands due to rotor bar slip frequency f rs 20 log I line −20 log I rs , that is, 20 log (I line / I rs ) is used as a deterioration parameter, so that it is accurately determined whether or not the load torque of the three-phase induction motor 12 has changed due to the change in the deterioration parameter. Can be diagnosed.

以上、本発明を、実施の形態を参照して説明してきたが、本発明は何ら上記した実施の形態に記載した構成に限定されるものではなく、特許請求の範囲に記載されている事項の範囲内で考えられるその他の実施の形態や変形例も含むものである。
更に、本実施の形態とその他の実施の形態や変形例にそれぞれ含まれる構成要素を組合わせたものも、本発明に含まれる。
例えば、電流スペクトルの電源周波数スペクトルの電源周波数ｆｌｉｎｅを、三相誘導電動機に交流電力を供給する電源の基本周波数としたが、電源周波数スペクトルの電源周波数ｆｌｉｎｅを高調波周波数とすることもできる。これにより、回転機械系の機械的構造と関連する側帯波の周波数が電源の基本周波数を超える場合であっても、側帯波を検知することができ、回転機械系の機械的構造に関連する劣化パラメータを正確に評価することが可能になる。
なお、三相誘導電動機に交流電力を供給する電源がインバータ電源であっても本発明は適用できる。 As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
Further, the present invention also includes a combination of components included in the present embodiment and other embodiments and modifications.
For example, the power supply frequency f line of the power spectrum of the current spectrum is set to the fundamental frequency of the power supply that supplies AC power to the three-phase induction motor, but the power supply frequency f line of the power supply frequency spectrum can also be set to the harmonic frequency. . As a result, even if the frequency of the sideband wave related to the mechanical structure of the rotating machine system exceeds the fundamental frequency of the power supply, the sideband wave can be detected and the deterioration related to the mechanical structure of the rotating machine system. It becomes possible to accurately evaluate the parameters.
Note that the present invention can be applied even if the power source for supplying AC power to the three-phase induction motor is an inverter power source.

１０：回転機械系、１１：電気盤、１２：三相誘導電動機、１３：電動機配線、１４：クランプ式電流センサ、１５：電源ケーブル、１６：Ａ／Ｄ変換器、１７：伝送路、１８：周波数解析器、１９：第１のデータ処理手段、２０：第２のデータ処理手段、２１：第３のデータ処理手段 10: Rotating mechanical system, 11: Electric board, 12: Three-phase induction motor, 13: Motor wiring, 14: Clamp-type current sensor, 15: Power cable, 16: A / D converter, 17: Transmission path, 18: Frequency analyzer, 19: first data processing means, 20: second data processing means, 21: third data processing means

前記目的に沿う本発明に係る三相誘導電動機の固有特徴量を決定する方法は、三相誘導電動機を駆動源とする回転機械系の稼働時の状態を診断する際に必要な三相誘導電動機の固有特徴量を決定する方法であって、
前記三相誘導電動機の稼働時電流信号を計測し、該稼働時電流信号の周波数解析を行う第１工程と、
前記周波数解析から得られた電流スペクトルの中から、前記三相誘導電動機の電源周波数スペクトルの側帯波であって、電源周波数ｆｌｉｎｅと前記三相誘導電動機の同期回転周波数ｆＸとの差の値を下限周波数、該下限周波数に０．０１〜４Ｈｚの範囲で設定される周波数値を加えた値を上限周波数とする周波数領域Ａ内に存在する最大高さのピークを求めて側帯波ＳＡとし、前記電源周波数ｆｌｉｎｅに前記同期回転周波数ｆＸを加えた値を上限周波数、該上限周波数から０．０１〜４Ｈｚの範囲で設定される周波数値を引いた値を下限周波数とする周波数領域Ｂ内に存在する最大高さのピークを求めて側帯波ＳＢとする第２工程と、
前記側帯波ＳＡ、ＳＢのいずれか一方のピーク位置周波数と前記電源周波数ｆｌｉｎｅの差の絶対値を前記三相誘導電動機の実回転周波数ｆｒとする第３工程とを有し、
前記実回転周波数ｆｒを第１の固有特徴量とする。 The method for determining the characteristic feature amount of the three-phase induction motor according to the present invention that meets the above-described object is a three-phase induction motor that is necessary for diagnosing the operating state of a rotary machine system that uses a three-phase induction motor as a drive source. A method for determining a characteristic feature of
A first step of measuring an operating current signal of the three-phase induction motor and performing a frequency analysis of the operating current signal;
Of the current spectrum obtained from the frequency analysis, a sideband of the power frequency spectrum of the three-phase induction motor, and a value of a difference between the power frequency f line and the synchronous rotation frequency f X of the three-phase induction motor the lower limit frequency, seeking the peak of maximum height the value obtained by adding the frequency value set in the range of 0.01~4Hz the lower limit frequency present in the frequency area a to the upper limit frequency and sidebands S a A frequency region B having a value obtained by adding the synchronous rotation frequency f X to the power supply frequency f line as an upper limit frequency, and a value obtained by subtracting a frequency value set in a range of 0.01 to 4 Hz from the upper limit frequency as a lower limit frequency. a second step of the sidebands S B seeking the peak of maximum height that exists within,
The sideband S A, and a third step of the actual rotational frequency f r of the absolute value the three-phase induction motor of the difference either between one peak position frequency the power supply frequency f line of S B,
The actual rotation frequency fr is set as a first characteristic feature.

Claims (2)

三相誘導電動機を駆動源とする回転機械系の稼働時の状態を診断する際に必要な三相誘導電動機の固有特徴量を決定する方法であって、
前記三相誘導電動機の稼働時電流信号を計測し、該稼働時電流信号の周波数解析を行う第１工程と、
前記周波数解析から得られた電流スペクトルの中から、前記三相誘導電動機の電源周波数スペクトルの側帯波であって、電源周波数ｆｌｉｎｅと前記三相誘導電動機の同期回転周波数ｆＸとの差の値を下限周波数、該下限周波数に０．０１〜４Ｈｚの範囲で設定される周波数値を加えた値を上限周波数とする周波数領域Ａに存在する最大高さのピークを求めて側帯波ＳＡとし、前記電源周波数ｆｌｉｎｅに前記同期回転周波数ｆＸを加えた値を上限周波数、該上限周波数から０．０１〜４Ｈｚの範囲で設定される周波数値を引いた値を下限周波数とする周波数領域Ｂに存在する最大高さのピークを求めて側帯波ＳＢとする第２工程と、
前記側帯波ＳＡ、ＳＢのいずれか一方のピーク位置周波数と前記電源周波数ｆｌｉｎｅの差の絶対値を前記三相誘導電動機の実回転周波数ｆｒとする第３工程とを有し、
前記実回転周波数ｆｒを第１の固有特徴量とすることを特徴とする三相誘導電動機の固有特徴量を決定する方法。 A method for determining the characteristic features of a three-phase induction motor necessary for diagnosing the operating state of a rotating machine system using a three-phase induction motor as a drive source,
A first step of measuring an operating current signal of the three-phase induction motor and performing a frequency analysis of the operating current signal;
Of the current spectrum obtained from the frequency analysis, a sideband of the power frequency spectrum of the three-phase induction motor, and a value of a difference between the power frequency f line and the synchronous rotation frequency f X of the three-phase induction motor the lower limit frequency, seeking the peak of maximum height the value obtained by adding the frequency value set in the range of 0.01~4Hz the lower limit frequency present in the frequency area a to the upper limit frequency and sidebands S a, In frequency region B, the value obtained by adding the synchronous rotation frequency f X to the power supply frequency f line is the upper limit frequency, and the value obtained by subtracting the frequency value set in the range of 0.01 to 4 Hz from the upper limit frequency is the lower limit frequency. a second step of the sidebands S B seeking the peak of maximum height that is present,
The sideband S A, and a third step of the actual rotational frequency f r of the absolute value the three-phase induction motor of the difference either between one peak position frequency the power supply frequency f line of S B,
A method for determining a characteristic feature of a three-phase induction motor, wherein the actual rotational frequency fr is a first characteristic feature. 請求項1記載の三相誘導電動機の固有特徴量を決定する方法において、前記同期回転周波数ｆＸと前記実回転周波数ｆｒとの差をすべり周波数ｆｓとする第４工程と、
前記電流スペクトルの中から、前記電源周波数スペクトルの側帯波であって、前記すべり周波数ｆｓと前記三相誘導電動機の極数ｐの積として定義されるポール通過周波数ｆｐｐに起因して低周波数側及び高周波数側にそれぞれ存在する側帯波ＳＰＡ、ＳＰＢを求める第５工程と、
前記側帯波ＳＰＡと前記側帯波ＳＡの間に存在する最大高さのピークを求めて側帯波ＳＬＡとし、前記側帯波ＳＰＢと前記側帯波ＳＢの間に存在する最大高さのピークを求めて側帯波ＳＬＢとする第６工程と、
前記側帯波ＳＬＡ、ＳＬＢのいずれか一方のピーク位置周波数と前記電源周波数ｆｌｉｎｅの差の絶対値を前記三相誘導電動機の回転子バーすべり周波数ｆｒｓとする第７工程と、
前記回転子バーすべり周波数ｆｒｓを前記すべり周波数ｆｓで除して前記三相誘導電動機の回転子バー本数とする第８工程とを更に有し、
前記回転子バー本数を第２の固有特徴量とすることを特徴とする三相誘導電動機の固有特徴量を決定する方法。 A method of determining the specific characteristics of the three-phase induction motor according to claim 1, a fourth step of the difference of the slip frequency f s of the synchronous rotary frequency f X wherein the actual rotational frequency f r,
Of the current spectrum, a sideband of the power supply frequency spectrum, which is a low frequency due to a pole passing frequency f pp defined as a product of the slip frequency f s and the number of poles p of the three-phase induction motor A fifth step for obtaining sidebands S PA and S PB existing on the side and the high frequency side,
The sideband S seeking the peak of maximum height that exists between the PA and the sidebands S A and sidebands S LA, the maximum height that exists between the sidebands S PB said sidebands S B a sixth step of the sidebands S LB seeking peak,
A seventh step in which the absolute value of the difference between the peak position frequency of either one of the sidebands S LA and S LB and the power supply frequency f line is set as the rotor bar slip frequency f rs of the three-phase induction motor;
Further comprising an eighth step of the rotor bar slip frequency f rs by dividing the slip frequency f s and the rotor bar number of the three-phase induction motor,
A method for determining a characteristic feature of a three-phase induction motor, wherein the number of rotor bars is set as a second characteristic feature.
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