KR101133234B1 - Resolution increase method of device defect signal by synthesizing of electric motor 3 phase current signal - Google Patents

Resolution increase method of device defect signal by synthesizing of electric motor 3 phase current signal Download PDF

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KR101133234B1
KR101133234B1 KR1020100005896A KR20100005896A KR101133234B1 KR 101133234 B1 KR101133234 B1 KR 101133234B1 KR 1020100005896 A KR1020100005896 A KR 1020100005896A KR 20100005896 A KR20100005896 A KR 20100005896A KR 101133234 B1 KR101133234 B1 KR 101133234B1
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motor
phase current
current signal
synthesizing
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KR20110086263A (en
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유무상
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한전케이피에스 주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground

Abstract

본 발명은 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법에 관한 것으로, 전동기의 전원 케이블(3상)에 전류 센서인 클램프 훅 메타를 설치하는 센서설치단계(S1단계)와; 설치한 센서로 3상 전류신호를 각각 측정하는 3상 전류신호 측정단계(S2단계)와; 상기 3상 전류신호 측정단계(S2단계)에서 측정된 신호를 신호합성기로 합성하는 신호합성단계(S3단계) 및; 상기 신호합성단계(S3단계)에서 얻어지는 합성신호의 주파수를 통상의 주파수 분석기로 분석하여 주파수의 이상 유무에 따라 전동기의 상태를 감시하고 전동기의 결함을 진단하는 신호분석단계(S4단계)로 이루어져 전류신호(3상)를 합성하여 전원 주파수 성분(60Hz)을 제거함으로써 필터(filter) 등의 복잡한 회로 및 계산 과정을 거치지 않고도 결함주파수에 대한 신호만 받을 수 있고, 60Hz 근방의 주파수 분석정밀도가 높아지며, 60Hz 성분이 제거된 결함성분의 신호만 받기 때문에 신호 정밀도를 높일 수 있으며, 기존의 개별적인 한 상(one phase)의 신호보다는 결함신호의 정밀도(Signal to Noise ratio)가 향상되어 분석시 잡음신호 레벨(noise level)에 대한 영향을 적게 받을 뿐만 아니라 60Hz의 신호가 제거되기 때문에 60Hz 동기속도의 전동기에서도 결함 주파수의 분석을 용이하게 할 수 있는 각별한 장점이 있는 유용한 발명이다.The present invention relates to a method of increasing the resolution of a device fault signal by synthesizing a three-phase current signal of the motor, comprising: a sensor installation step (S1 step) of installing a clamp hook meta which is a current sensor on a power cable (three phase) of the motor; A three-phase current signal measuring step of measuring three-phase current signals with the installed sensor (step S2); A signal synthesis step (S3 step) of synthesizing the signal measured in the three-phase current signal measurement step (S2 step) with a signal synthesizer; The signal analysis step (S4 step) of analyzing the frequency of the synthesized signal obtained in the signal synthesis step (S3 step) by using a conventional frequency analyzer to monitor the state of the motor according to the presence or absence of the frequency and diagnose the defect of the motor (S4 step) By synthesizing signals (three phases) and removing power frequency components (60Hz), only signals for defective frequencies can be received without complicated circuits and calculation processes such as filters, and frequency analysis accuracy near 60Hz is improved. Signal accuracy can be improved by receiving only the signal of the defect component with 60Hz component removed, and the signal to noise ratio is improved compared to the existing one-phase signal. Not only are they less affected by noise levels, but the 60 Hz signal is eliminated, so even at 60 Hz synchronous motors, The particular advantage of being able to facilitate a useful invention in the.

Description

전동기 ３상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법{Resolution increase method of device defect signal by synthesizing of electric motor 3 phase current signal}Resolution increase method of device defect signal by synthesizing of electric motor 3 phase current signal}

본 발명은 기기결함 신호의 해상도 증가방법에 관한 것으로서, 더욱 상세하게는 전동기에 인입되는 3상 전류의 신호를 이용하여 진동 주파수 분석기법으로 전동기에 발생하는 다양한 결함 신호의 해상도를 증가시키는 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법에 관한 것이다.The present invention relates to a method of increasing the resolution of a device fault signal, and more particularly to a three-phase motor that increases the resolution of various defect signals generated in a motor by a vibration frequency analyzer method using a signal of a three-phase current introduced into the motor. The present invention relates to a method for increasing the resolution of a device fault signal by synthesizing a current signal.

일반적으로 전동기에 인입되는 3상 전류의 신호를 이용하여 진동 주파수 분석기법과 마찬가지로 전동기의 전류신호를 이용한 주파수 분석기법으로 전동기에 발생하는 다양한 결함 신호의 존재 유무를 진단한다(도 1은 종래 주파수 분석기법으로 분석한 전류신호의 주파수를 나타내고 있다).In general, a frequency analyzer method using a current signal of a motor is used to diagnose the presence of various defect signals generated in the motor using a three-phase current signal introduced into the motor (Fig. 1 shows a conventional frequency analyzer method). Shows the frequency of the current signal analyzed by

이러한 전동기에서의 결함진단은 로터 바 결함뿐만 아니라, 베어링 결함 등의 기계적인 결함 진단 역시 가능하다. 따라서 전동기에서의 전류신호만 가지고도 다양한 결함 검출 및 감시가 가능해지고, 이러한 결합주파수에서의 진단 감시를 통하여 효율적인 전동기(또는 연결 기기) 감시프로그램을 운영할 수 있다.The defect diagnosis in the motor is possible to diagnose not only the rotor bar defects, but also mechanical defects such as bearing defects. Therefore, various defects can be detected and monitored only by the current signal from the motor, and an efficient motor (or connected device) monitoring program can be operated through the diagnostic monitoring at the coupling frequency.

전동기 전류 값의 크기 및 주파수 분석기법을 사용하여 전동기의 전기적/ 기계적 결함 분석을 하고 있다. 그러나, 계통(전원) 주파수(한국의 경우, 60Hz)가 존재하여, 60Hz와 인접한 주파수의 경우 주파수 분석을 위해서는 측정시 주파수 해상도를 높여야 한다. 이러한 주파수 분석 해상도를 높이기 위해서는 보다 긴 측정시간이 요구된다.The electric and mechanical defects of the motor are analyzed using the magnitude and frequency analyzer method of the motor current value. However, there is a grid frequency (60 Hz in Korea), and for frequencies analysis at frequencies close to 60 Hz, the frequency resolution must be increased during measurement. Longer measurement times are required to increase the resolution of these frequencies.

측정되는 전류신호는 전동기의 전류신호를 분석한 전류신호/시간 파형도인 도 4a와 전동기의 전류신호를 분석한 전류신호/시간 파형도인 도 4b로부터 알 수 있는 바와 같이 진폭 피크는 8A를 나타내고, 60Hz 주파수 성분 뿐만 아니라 하모닉(Harmonic) 성분이 관찰되는 60Hz 신호 값이 대부분이고 분석대상인 결함신호의 크기가 상대적으로 적기 때문에 분석 결과에서 결함신호가 잡음신호 레벨(noise level)과의 분별력이 적어 분석 정밀도가 떨어진다. 이러한 분석결과의 정밀도를 향상시키기 위하여 종래부터 도 2에 나타낸 인벨롭(envelope) 검출법, 전류신호의 전원주파수(60Hz) 제거방법, 60 Hz 주파수 복조(demodulation) 방법, 도 3에 나타낸 측정신호에서의 60Hz 역상신호 발생 및 이를 이용한 기존 신호의 합성방법 등이 활용되었다.The measured current signal has an amplitude peak of 8A, as can be seen from FIG. 4A which is a current signal / time waveform diagram analyzing the current signal of the motor and FIG. 4B which is a current signal / time waveform diagram analyzing the current signal of the motor. In the analysis result, the defect signal is less distinguished from the noise signal level because most of the 60Hz signal values where the harmonic component is observed, as well as the 60Hz frequency component and the magnitude of the defect signal to be analyzed are relatively small. The precision is poor. In order to improve the accuracy of the analysis result, the envelope detection method shown in Fig. 2, the power frequency (60 Hz) removal method of the current signal, the 60 Hz frequency demodulation method, and the measurement signal shown in Fig. The generation of 60Hz reverse phase signal and the synthesis method of the existing signal using the same are used.

그러나, 추가적인 필터(filter)등의 회로/ 프로그램적인 기법이 사용되어도 60Hz 신호만 정확히 제거하기가 불가능하다는 결점이 있었다.However, there is a drawback that it is impossible to accurately remove only 60Hz signal even if additional circuit / programmable techniques such as filter are used.

또한, 신호의 입력단계에서부터 큰 신호를 받기 때문에 신호의 최대 최소 비율(dynamic range)이 크게 되어 AD(Analog to digital) 변환시 적은 크기의 결함신호에 대한 정밀도가 적어지는 문제점이 있었다.In addition, since a large signal is received from the input stage of the signal, the maximum minimum dynamic range of the signal is increased, thereby reducing the precision of a small defect signal during analog to digital (AD) conversion.

본 발명은 상기한 실정을 감안하여 종래 기기결함 신호의 해상도 증가방법에서 야기되는 여러 가지 결점 및 문제점들을 해결하고자 발명한 것으로서, 그 목적은 전류신호(3상)를 합성하여 전원 주파수 성분(60Hz)을 제거함으로써 필터(filte r) 등의 복잡한 회로 및 계산 과정을 거치지 않고도 결함주파수에 대한 신호만 받을 수 있는 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법을 제공함에 있다.SUMMARY OF THE INVENTION In view of the above situation, the present invention has been invented to solve various defects and problems caused by the conventional method for increasing the resolution of a device fault signal. The object of the present invention is to synthesize a current signal (three phase) and supply a power frequency component (60 Hz). The present invention provides a method of increasing the resolution of a device fault signal by synthesizing a three-phase current signal of a motor capable of receiving only a signal for a defect frequency without a complicated circuit such as a filter and a calculation process.

본 발명의 다른 목적은 60Hz 근방의 주파수 분석정밀도가 높아지며, 60Hz 성분이 제거된 결함성분의 신호만 받기 때문에 신호 정밀도를 높일 수 있는 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법을 제공하는 데 있다.Another object of the present invention is to increase the frequency analysis accuracy near 60Hz, and because it receives only the signal of the defect component from which 60Hz component is removed, it is possible to increase the resolution of the device defect signal by synthesizing the three-phase current signal of the motor which can improve the signal accuracy. To provide.

본 발명의 또 다른 목적은 기존의 개별적인 한 상(one phase)의 신호보다는 결함신호의 정밀도(Signal to Noise ratio)가 향상되어 분석시 잡음신호 레벨(noi se level)에 대한 영향을 적게 받는 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법을 제공하는 데 있다.Another object of the present invention is to improve the signal to noise ratio (signal to noise ratio) than the conventional one-phase signal of the conventional motor 3 less affected by the noise signal (noi se level) analysis The present invention provides a method for increasing the resolution of a device fault signal by synthesizing a phase current signal.

본 발명의 또 다른 목적은 60Hz의 신호가 제거되기 때문에 60Hz 동기속도의 전동기(실제 구동되는 회전수는 동기속도보다 10rpm 이상 낮은 운전속도를 가짐) 에서도 결함 주파수의 분석을 용이하게 할 수 있는 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법을 제공하는 데 있다.Another object of the present invention is to remove the signal of 60Hz, because the motor of 60Hz synchronous speed (actual drive speed has a driving speed of more than 10rpm lower than the synchronous speed) motor that can facilitate the analysis of the fault frequency 3 The present invention provides a method for increasing the resolution of a device fault signal by synthesizing a phase current signal.

상기한 목적을 달성하기 위한 본 발명 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법은 전동기에 가해지는 전원 케이블(3상)에 전류를 측정하는 센서인 클램프 훅 메타(clamp hook meter)를 설치하는 센서설치단계(S1단계)와; 상기 S1단계에서 설치한 센서로 3상 전류신호를 각각 측정하는 3상 전류신호 측정단계(S2단계)와; 상기 3상 전류신호 측정단계(S2단계)에서 측정된 신호를 신호합성기로 합성하는 신호합성단계(S3단계) 및; 상기 신호합성단계(S3단계)에서 얻어지는 합성신호의 주파수를 통상의 주파수 분석기로 분석하여 주파수의 이상 유무에 따라 전동기의 상태를 감시하고 전동기의 결함을 진단하는 신호분석단계(S4단계)로 이루어진 것을 특징으로 한다.In order to achieve the above object, a method of increasing a resolution of a device fault signal by synthesizing a three-phase current signal of a motor of the present invention includes a clamp hook meter which is a sensor for measuring a current in a power cable (three phase) applied to a motor. Sensor installation step (step S1) to install; A three-phase current signal measuring step (S2 step) of measuring three-phase current signals with the sensor installed in step S1; A signal synthesis step (S3 step) of synthesizing the signal measured in the three-phase current signal measurement step (S2 step) with a signal synthesizer; It consists of a signal analysis step (S4 step) to analyze the frequency of the synthesized signal obtained in the signal synthesis step (S3 step) by using a conventional frequency analyzer to monitor the state of the motor according to the presence or absence of frequency and to diagnose the defect of the motor It features.

본 발명은 전류신호(3상)를 합성하여 전원 주파수 성분(60Hz)을 제거함으로써 필터(filter) 등의 복잡한 회로 및 계산 과정을 거치지 않고도 결함주파수에 대한 신호만 받을 수 있고, 60Hz 근방의 주파수 분석정밀도가 높아지며, 60Hz 성분이 제거된 결함성분의 신호만 받기 때문에 신호 정밀도를 높일 수 있으며, 기존의 개별적인 한 상(one phase)의 신호보다는 결함신호의 정밀도(Signal to Noise ratio)가 향상되어 분석시 잡음신호 레벨(noise level)에 대한 영향을 적게 받을 뿐만 아니라 60Hz의 신호가 제거되기 때문에 60Hz 동기속도의 전동기에서도 결함 주파수의 분석을 용이하게 할 수 있는 각별한 장점이 있다.The present invention synthesizes a current signal (three phases) and removes a power frequency component (60 Hz) so that only a signal for a defective frequency can be received without a complicated circuit such as a filter and a calculation process, and frequency analysis near 60 Hz is performed. The accuracy is higher, and the signal accuracy can be improved because only the signal of the defect component with 60Hz component is removed can be improved, and the signal to noise ratio is improved when analyzing the signal rather than the existing one-phase signal. Not only are they less affected by noise levels, but 60Hz signals are eliminated, which makes it easier to analyze fault frequencies even at 60Hz synchronous speed motors.

도 1은 종래 전동기의 전류신호를 분석한 전류신호의 주파수를 나타낸 도면,
도 2는 종래 인벨롭(envelope) 검출법으로 전류신호로부터 인벨롭(envelope) 신호를 추출하는 개요도,
도 3은 종래 전류신호를 분석하기 위해 구성한 역상신호 합성과 저역통과필터를 구비한 복조기의 회로도,
도 4a는 종래 전동기의 전류신호를 분석한 전류신호/시간 파형도,
도 4b는 종래 전동기의 전류신호를 분석한 전류신호/주파수 파형도,
도 5는 본 발명 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법을 실행하는 순서도,
도 6은 본 발명에 따른 3상 신호합성을 통한 60Hz의 전원신호의 제거에 대한 개념도,
도 7a는 본 발명의 방법으로 전동기의 전류신호를 분석한 전류신호/시간 파형도,
도 7b는 본 발명의 방법으로 전동기의 전류신호를 분석한 전류신호/주파수 파형도,
도 8a는 본 발명의 방법으로 전동기의 전원케이블(3상이 합성된)의 전류신호를 분석한 전류신호/시간 파형도,
도 8b는 본 발명의 방법으로 전동기의 전원케이블(3상이 합성된)의 전류신호를 분석한 전류신호/주파수 파형도 이다.1 is a view showing the frequency of the current signal analyzed the current signal of the conventional motor,
2 is a schematic diagram of extracting an envelope signal from a current signal by a conventional envelope detection method;
3 is a circuit diagram of a demodulator including a reverse phase signal synthesis and a low pass filter configured to analyze a conventional current signal;
Figure 4a is a current signal / time waveform diagram analyzing the current signal of the conventional motor,
Figure 4b is a current signal / frequency waveform diagram of analyzing the current signal of the conventional motor,
5 is a flowchart of a method of increasing the resolution of a device fault signal by synthesizing a three-phase current signal of the present invention;
6 is a conceptual diagram for removing a power signal of 60 Hz through three-phase signal synthesis according to the present invention;
7A is a current signal / time waveform diagram of analyzing a current signal of a motor by the method of the present invention;
Figure 7b is a current signal / frequency waveform diagram of analyzing the current signal of the motor by the method of the present invention,
8A is a current signal / time waveform diagram of analyzing a current signal of a power cable (synthesized three phases) of a motor by the method of the present invention;
Fig. 8B is a current signal / frequency waveform diagram analyzing a current signal of a power cable (synthesized three phases) of the motor by the method of the present invention.

이하, 첨부 도면을 참조하여 본 발명 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법의 바람직한 실시 예를 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the method for increasing the resolution of the device fault signal by synthesizing the three-phase current signal of the present invention.

도 5는 본 발명 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법을 실행하는 순서도, 도 6은 본 발명에 따른 3상 신호합성을 통한 60Hz의 전원신호의 제거에 대한 개념도, 도 7a는 본 발명의 방법으로 전동기의 전류신호를 분석한 전류신호/시간 파형도, 도 7b는 본 발명의 방법으로 전동기의 전류신호를 분석한 전류신호/주파수 파형도, 도 8a는 본 발명의 방법으로 전동기의 전원케이블(3상이 합성된)의 전류신호를 분석한 전류신호/시간 파형도, 도 8b는 본 발명의 방법으로 전동기의 전원케이블(3상이 합성된)의 전류신호를 분석한 전류신호/주파수 파형도로서, 본 발명 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법은 전동기에 가해지는 전원 케이블(3상)에 전류를 측정하는 센서인 클램프 훅 메타(clamp hook meter)를 설치하는 센서설치단계(S1단계)와; 상기 S1단계에서 설치한 센서로 3상 전류신호를 각각 측정하는 3상 전류신호 측정단계(S2단계)와; 상기 3상 전류신호 측정단계(S2단계)에서 측정된 신호를 신호합성기로 합성하는 신호합성단계(S3단계) 및; 상기 신호합성단계(S3단계)에서 얻어지는 합성신호의 주파수를 통상의 주파수 분석기로 분석하여 주파수의 이상 유무에 따라 전동기의 상태를 감시하고 전동기의 결함을 진단하는 신호분석단계(S4단계)로 이루어진다.FIG. 5 is a flowchart illustrating a method of increasing a resolution of a device fault signal by synthesizing a three-phase current signal of the present invention. FIG. 6 is a conceptual diagram of removing a power signal of 60 Hz through three-phase signal synthesis according to the present invention. 7a is a current signal / time waveform diagram analyzing the current signal of the motor by the method of the present invention, Figure 7b is a current signal / frequency waveform diagram analyzing the current signal of the motor by the method of the present invention, Figure 8a is a method of the present invention FIG. 8B is a current signal / time waveform diagram of analyzing a current signal of a power cable (synthesized three phases) of the motor. FIG. 8B is a current signal analyzing a current signal of a power cable (synthesized three phases) of the motor by the method of the present invention. As a frequency waveform diagram, a method of increasing the resolution of a device fault signal by synthesizing a three-phase current signal of a motor of the present invention is a clamp hook meter which is a sensor for measuring a current in a power cable (three phase) applied to a motor. Sensor mounting step of installation (step S1), and; A three-phase current signal measuring step (S2 step) of measuring three-phase current signals with the sensor installed in step S1; A signal synthesis step (S3 step) of synthesizing the signal measured in the three-phase current signal measurement step (S2 step) with a signal synthesizer; A signal analysis step (step S4) is performed by analyzing the frequency of the synthesized signal obtained in the signal synthesis step (step S3) by monitoring the state of the motor and diagnosing a defect of the motor according to the presence or absence of frequency.

상기 센서설치단계(S1단계)에서의 센서의 설치는 전동기의 단자함 또는 모터 제어반(MCC) 내 2차 전류측 케이블에 설치한다.Installation of the sensor in the sensor installation step (step S1) is installed in the secondary current side cable in the terminal box of the motor or the motor control panel (MCC).

상기 3상 전류신호 측정단계(S2단계)에서 측정값에 차이가 있으면, 게인을 조절한다.If there is a difference in the measured value in the three-phase current signal measurement step (step S2), the gain is adjusted.

그리고, 상기 신호분석단계(S4단계)에서는 전류신호(3상)를 신호합성기로 합성함으로써 순수하게 전동기에 인입되는 전기적인 60Hz 신호 외의 전기/기계적인 신호만을 검출하여 통상의 주파수 분석기로 분석하여 주파수의 이상 유무에 따라 전동기의 상태를 감시하고 전동기의 결함을 진단한다.In the signal analysis step (S4), the current signal (three phase) is synthesized by a signal synthesizer to detect only an electrical / mechanical signal other than the electrical 60 Hz signal that is purely introduced into the motor, and then analyze the frequency with a conventional frequency analyzer. The condition of the motor is monitored and the fault of the motor is diagnosed according to the abnormality.

여기서 상기 센서설치단계 (S1단계)에서부터 신호합성단계(S3단계)까지의 과정을 전동기 전원 3상을 한 번에 측정하는 과정을 통해서도 기기결함 신호의 해상도를 증가시킬 수 있다.Here, the resolution of the device fault signal may also be increased by measuring the three phases of the motor power at once from the sensor installation step (S1 step) to the signal synthesis step (S3 step).

다음에는 상기한 바와 같이 이루어지는 본 발명 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법의 작용을 실시 예로 상세하게 설명한다.Next, the operation of the method for increasing the resolution of the device fault signal by synthesizing the three-phase current signal of the present invention made as described above will be described in detail by way of example.

먼저 센서설치단계(S1단계)에서 센서로서 클램프 훅 메타(clamp hook meter)를 전동기의 단자함 또는 모터 제어반(MCC) 내 2차 전류측 케이블에 설치한다.First, in the sensor installation step (step S1), a clamp hook meter as a sensor is installed in the terminal box of the motor or the secondary current side cable in the motor control panel (MCC).

이어서 상기 S1단계에서 설치한 센서로 3상 전류신호를 각각 측정하고(S2단계), 측정된 신호를 신호합성기로 합성하였다(S3단계). 신호의 합성결과 도 6에 도시한 바와 같이 각 상의 전류신호에서 동일한 시점에 피크(peak) 신호가 발생하여 엑셀에서 시험결과 잔류신호는 1% 크기의 신호 파형에 1%의 피크(peak) 신호가 검출되었다.Subsequently, the three-phase current signals were measured with the sensor installed in step S1 (step S2), and the measured signals were synthesized by the signal synthesizer (step S3). Synthesis result of signal As shown in FIG. 6, peak signal is generated at the same time point in current signal of each phase. In Excel, the residual signal shows 1% peak signal in 1% signal waveform. Detected.

이와 같이 하여 3상 신호의 합성으로 60Hz의 전원신호를 제거한 전류신호/시간 파형도는 도 7a와 같고, 전류신호/주파수 파형도는 도 7b와 같았다.Thus, the current signal / time waveform diagram in which the 60 Hz power signal was removed by the synthesis of the three-phase signal was as shown in FIG. 7A, and the current signal / frequency waveform diagram was shown in FIG. 7B.

상기 센서를 전원케이블에 설치하여 측정한 3상 합성신호의 전류신호/시간 파형도는 도 8a로 나타나고, 전류신호/주파수 파형도는 도 8b로 나타나 60Hz의 성분이 제거되며, 신호의 레벨은 1mA로 1/8000로 감소된다. 또한 이때 주파수 분석시에도 60Hz가 제거된 것을 확인할 수 있으며, 이때의 노이즈 레벨은 거의 10uA에 근접함을 알 수 있었다.The current signal / time waveform diagram of the three-phase synthesized signal measured by installing the sensor on a power cable is shown in FIG. 8A, and the current signal / frequency waveform diagram is shown in FIG. 8B to remove 60 Hz components, and the signal level is 1 mA. Is reduced to 1/8000. In addition, it was confirmed that 60Hz was removed even at the time of frequency analysis, and the noise level was found to be close to 10uA.

따라서 상기 신호합성단계(S3단계)에서 얻어지는 합성신호의 주파수를 분석하여 주파수의 이상 유무에 따라 전동기의 상태를 감시하고 전동기의 결함을 진단할 수 있다(S4단계).Therefore, by analyzing the frequency of the synthesized signal obtained in the signal synthesis step (S3 step), it is possible to monitor the state of the motor according to the presence or absence of the frequency and to diagnose the defect of the motor (step S4).

여기서 측정된 3상 신호의 합성으로 분석하고자 하는 신호의 레벨이 현저히 낮아지므로, 계측기 입력신호의 게인(Gain)을 증가시키면, 분석의 해상도를 높일 수 있다.Since the level of the signal to be analyzed is significantly lowered by synthesizing the measured three-phase signal, increasing the gain of the instrument input signal may increase the resolution of the analysis.

지금까지 본 발명을 바람직한 실시예로서 설명하였으나, 본 발명은 이에 한정되지 않고 발명의 요지를 이탈하지 않는 범위 내에서 다양하게 변형하여 실시할 수 있음은 물론이다.
While the present invention has been described as a preferred embodiment, the present invention is not limited thereto, and various modifications can be made without departing from the gist of the invention.

Claims (5)

전동기에 가해지는 전원 케이블(3상)에 전류를 측정하는 센서인 클램프 훅 메타(clamp hook meter)를 설치하는 센서설치단계(S1단계)와; 상기 S1단계에서 설치한 센서로 3상 전류신호를 각각 측정하는 3상 전류신호 측정단계(S2단계)와; 상기 3상 전류신호 측정단계(S2단계)에서 측정된 신호를 신호합성기로 합성하는 신호합성단계(S3단계) 및; 상기 신호합성단계(S3단계)에서 얻어지는 합성신호의 주파수를 통상의 주파수 분석기로 분석하여 주파수의 이상 유무에 따라 전동기의 상태를 감시하고 전동기의 결함을 진단하는 신호분석단계(S4단계)로 이루어진 것을 특징으로 하는 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법.A sensor installation step (step S1) for installing a clamp hook meter, which is a sensor for measuring current, on a power cable (three phases) applied to the motor; A three-phase current signal measuring step (S2 step) of measuring three-phase current signals with the sensor installed in step S1; A signal synthesis step (S3 step) of synthesizing the signal measured in the three-phase current signal measurement step (S2 step) with a signal synthesizer; It consists of a signal analysis step (S4 step) to analyze the frequency of the synthesized signal obtained in the signal synthesis step (S3 step) by using a conventional frequency analyzer to monitor the state of the motor according to the presence or absence of frequency and to diagnose the defect of the motor A method of increasing the resolution of a device fault signal by synthesizing a three-phase current signal of a motor. 제 1항에 있어서, 상기 센서설치단계(S1단계)에서의 센서의 설치는 전동기의 단자함 또는 모터 제어반(MCC) 내 2차 전류측 케이블에 설치하는 것을 특징으로 하는 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법.The method of claim 1, wherein the installation of the sensor in the sensor installation step (step S1) is a combination of the three-phase current signal of the motor, characterized in that installed in the terminal box of the motor or the secondary current side cable in the motor control panel (MCC). How to increase resolution of device fault signal through 제 1항에 있어서, 상기 3상 전류신호 측정단계(S2단계)에서 측정값에 차이가 있으면, 게인을 조절하는 것을 특징으로 하는 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법.The method of claim 1, wherein the gain is adjusted when there is a difference in the measured value in the three-phase current signal measurement step (S2 step). 제 1항에 있어서, 상기 신호분석단계(S4단계)에서는 전류신호(3상)를 신호합성기로 합성함으로써 순수하게 전동기에 인입되는 전기적인 60Hz 신호 외의 전기/기계적인 신호만을 검출하여 통상의 주파수 분석기로 분석하여 전동기의 상태를 감시하고 전동기의 결함을 진단하는 것을 특징으로 하는 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법.2. The conventional frequency analyzer of claim 1, wherein in the signal analysis step (step S4), the current signal (three phases) is synthesized by a signal synthesizer to detect only an electric / mechanical signal other than an electric 60 Hz signal that is purely introduced into the motor. Method for increasing the resolution of the device fault signal by synthesizing the three-phase current signal of the motor, characterized in that for monitoring the state of the motor by diagnosing the fault. 제 1항에 있어서, 상기 센서설치단계(S1단계)에서부터 신호합성단계(S3단계)까지의 과정이 전동기 전원 3상을 한 번에 측정하는 과정으로 이루어진 것을 특징으로 하는 전동기 3상 전류신호의 합성을 통한 기기결함 신호의 해상도 증가방법.The method of claim 1, wherein the process from the sensor installation step (S1 step) to the signal synthesis step (S3 step) comprises a step of measuring a three-phase electric motor power at a time. How to increase resolution of device fault signal through
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020016182A (en) * 2000-08-24 2002-03-04 권영한 Apparatus and method for diagnosing error of phase control rectifier
JP2006184160A (en) 2004-12-28 2006-07-13 Nissan Motor Co Ltd Current detection apparatus for three-phase a.c. motor with failure detection function
KR100812303B1 (en) 2006-09-29 2008-03-13 부산대학교 산학협력단 Apparatus and method for monitoring motor faults using a wavelet transformation
KR100925148B1 (en) 2007-11-28 2009-11-05 고려대학교 산학협력단 Apparatus and method for diagnosing three phase AC motor, and a medium having computer readable program for executing the method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020016182A (en) * 2000-08-24 2002-03-04 권영한 Apparatus and method for diagnosing error of phase control rectifier
JP2006184160A (en) 2004-12-28 2006-07-13 Nissan Motor Co Ltd Current detection apparatus for three-phase a.c. motor with failure detection function
KR100812303B1 (en) 2006-09-29 2008-03-13 부산대학교 산학협력단 Apparatus and method for monitoring motor faults using a wavelet transformation
KR100925148B1 (en) 2007-11-28 2009-11-05 고려대학교 산학협력단 Apparatus and method for diagnosing three phase AC motor, and a medium having computer readable program for executing the method

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