KR20030042857A - Method of Testing Fault of DC Motor and Device thereof - Google Patents
Method of Testing Fault of DC Motor and Device thereof Download PDFInfo
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- KR20030042857A KR20030042857A KR1020010073656A KR20010073656A KR20030042857A KR 20030042857 A KR20030042857 A KR 20030042857A KR 1020010073656 A KR1020010073656 A KR 1020010073656A KR 20010073656 A KR20010073656 A KR 20010073656A KR 20030042857 A KR20030042857 A KR 20030042857A
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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
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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Abstract
Description
본 발명은 직류모터의 고장검사방법 및 그 장치에 관한 것이다.The present invention relates to a failure inspection method and a device of a DC motor.
일반적으로 직류모터는 고정자계를 생성하는 계자부와 고정자계의 자속과 쇄교하도록 분산 배치된 적어도 2이상의 전기자코일을 갖고 있다. 전기자코일은 한쌍의 브러시, 다수의 정류자 및 전원선을 통해 모터구동전원에 연결된다. 정류자들은 고정자계와 상호 작용하여 회전력을 발생시키는 회전자계가 생성되도록 전기자코일을 브러시에 순차적으로 연결시킨다.Generally, a DC motor has at least two armature coils arranged in a distributed manner so as to bridge the magnetic field of the stator field and the magnetic field of the stator field. The armature coil is connected to the motor drive power supply via a pair of brushes, multiple commutators and power lines. The commutators sequentially connect the armature coil to the brush so that a rotor field is generated that interacts with the stator field to generate a rotational force.
이러한 구성을 갖는 직류모터들은 제품출하 전 또는 현장에서 사용하는 동안 고장여부가 수시로 검사된다. 직류모터의 고장으로는 정류자와 브러시사이의 접촉불량, 전기자코일과 정류자사이의 전기적 접촉을 유지하는 라이저(Riser) 또는 정류자의 누락, 전기자코일의 단선 등을 들 수 있다.DC motors with this configuration are often inspected for failure before shipment or during field use. Failure of the DC motor may include a faulty contact between the commutator and the brush, a riser or a commutator that maintains electrical contact between the armature coil and the commutator, and disconnection of the armature coil.
이러한 직류모터의 고장검사는 종래 제품검사자 또는 사용자의 육안을 통해 이루어지기 때문에 고장검사결과에 대한 신뢰성이 떨어지고 검사시간이 상대적으로 길어진다는 문제점이 있었다.Since the failure inspection of the DC motor is made through the naked eye of a conventional product inspector or user, there is a problem that the reliability of the failure inspection result is low and the inspection time is relatively long.
따라서, 본 발명의 목적은, 직류모터의 고장검사결과에 대한 신뢰성을 향상시킬 수 있을 뿐만 아니라 검사시간을 단축시킬 수 있는 직류모터의 고장검사방법 및 그 장치를 제공하는 것이다.Accordingly, an object of the present invention is to provide a method and apparatus for a failure inspection of a DC motor, which can not only improve the reliability of the failure inspection result of the DC motor but also reduce the inspection time.
도1은 본 발명의 실시예에 따른 직류모터의 고장검사장치의 기능별 블록도,1 is a functional block diagram of a failure inspection apparatus of a DC motor according to an embodiment of the present invention;
도2는 본 발명의 실시예에 따른 직류모터의 고장검사방법을 도시한 흐름도,2 is a flowchart illustrating a failure inspection method of a DC motor according to an embodiment of the present invention;
도3은 도2의 S30의 세부흐름도,3 is a detailed flowchart of S30 of FIG. 2;
도4는 도2의 S40의 세부흐름도이다.4 is a detailed flowchart of S40 of FIG.
* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
5 : 직류모터 7 : 모터전원공급장치5: DC motor 7: motor power supply
9 : 정류자정보입력장치 10 : 모터동작상태표시장치9: Commutator information input device 10: Motor operation status display device
11 : 전류검출부 21 : 중앙처리장치11: current detector 21: central processing unit
31 : 모터고장판단부 41 : 전류기본주파수결정부31: motor failure determination unit 41: current basic frequency determination unit
상기 목적은, 본 발명에 따라, 고정자계를 생성하는 계자부와 상기 고정자계의 자속과 쇄교하도록 분산 배치된 적어도 2이상의 전기자코일과 전원선을 통해 모터구동전원에 연결된 한 쌍의 브러시와 상기 브러시와 상기 전기자코일사이에 개재하여 상기 고정자계와 상호 작용하여 회전력을 발생시키는 회전자계를 생성하도록 상기 전기자코일을 상기 브러시에 순차적으로 연결하는 다수의 정류자를 갖는 직류모터의 고장검사방법에 있어서, 검사모터와 동일한 규격을 갖는 정상직류모터의 정격회전속도를 마련하는 단계와; 상기 검사모터의 전원선에 흐르는 모터전류를 검출하는 단계와; 상기 모터전류를 구성하는 모터조화함수전류성분의 기본주파수(F1)를 결정하는 단계와; 상기 모터조화함수전류성분의 기본주파수(F1)와 상기 정류자의 개수(C)를 수학식 F1÷C에 대입하여 기본주파수속도값을 산출하는 단계와; 상기 기본주파수속도값을 상기 정격회전속도와 비교하고, 상기 기본주파수속도값과 상기 정격회전속도와의 차가 상기 검사모터의 종류 및 소정의 검사오차범위에 따라 결정되는 기준속도차보다 큰 경우 상기 검사모터가 고장난 것으로 판단하는 단계를 포함하는 것을 특징으로 하는 직류모터의 고장검사방법에 의해 달성된다.The object is, according to the present invention, a pair of brushes and the brush connected to the motor drive power source via a power line and at least two armature coils and power lines distributed distributed so as to intersect with the magnetic field of the stator field and the magnetic field generating the stator field In the failure inspection method of the DC motor having a plurality of commutators sequentially connecting the armature coil to the brush to generate a rotating magnetic field to generate a rotating force by interacting with the stator field interposed between and the armature coil, Providing a rated rotational speed of a normal direct current motor having the same specification as the motor; Detecting a motor current flowing through a power line of the test motor; Determining a fundamental frequency (F1) of a motor harmonic function current component constituting the motor current; Calculating a fundamental frequency value by substituting a fundamental frequency (F1) and the number of commutators (C) of the motor harmonic function current component into an equation F1 ÷ C; The basic frequency speed value is compared with the rated rotation speed, and the inspection is performed when the difference between the fundamental frequency speed value and the rated rotation speed is larger than the reference speed difference determined according to the type of the inspection motor and a predetermined inspection error range. It is achieved by a failure inspection method of the DC motor, characterized in that it comprises the step of determining that the motor has failed.
여기서, 상기 전원선에 흐르는 모터전류 대신 상기 측정모터의 전원선에 분압저항을 직렬로 연결하고 상기 분압저항에 인가되는 모터전압을 검출함으로써 본 발명의 목적을 달성할 수 있다.Here, the object of the present invention can be achieved by connecting a voltage divider in series with the power line of the measurement motor instead of the motor current flowing through the power line and detecting the motor voltage applied to the voltage divider.
그리고 검사시간을 단축할 수 있도록, 상기 모터조화함수전류성분의 기본주파수(F1)를 결정하는 단계는, 상기 검사모터의 종류 및 상기 검사오차범위에 따라 결정되는 샘플링주파수로 상기 모터전류를 샘플링하는 단계와, 상기 모터조화함수전류성분의 기본주파수(F1)가 결정되도록 상기 샘플링된 모터전류를 고속푸리에변환하는 단계를 포함하도록 구성할 수 있다.In order to shorten the inspection time, the determining of the fundamental frequency F1 of the motor conditioning function current component may include sampling the motor current at a sampling frequency determined according to the type of the inspection motor and the inspection error range. And fast Fourier transforming the sampled motor current so that the fundamental frequency F1 of the motor harmonic function current component is determined.
한편, 상기 목적은 본 발명의 다른 분야에 따라 고정자계를 생성하는 계자부와 상기 고정자계의 자속과 쇄교하도록 분산 배치된 적어도 2이상의 전기자코일과 전원선을 통해 모터구동전원에 연결된 한 쌍의 브러시와 상기 브러시와 상기 전기자코일사이에 개재하여 상기 고정자계와 상호 작용하여 회전력을 발생시키는 회전자계를 생성하도록 상기 전기자코일을 상기 브러시에 순차적으로 연결하는 다수의 정류자를 갖는 직류모터의 고장검사장치에 있어서, 검사모터의 전원선에 흐르는 모터전류를 검출하는 모터전류검출부와; 상기 모터전류를 구성하는 모터조화함수전류성분의 기본주파수(F1)를 결정하는 전류기본주파수결정부와; 상기 모터조화함수전류성분의 기본주파수(F1)와 상기 정류자의 개수(C)를 수학식 F1÷C에 대입하여 기본주파수속도값을 산출하고, 상기 기본주파수속도값을 상기 검사모터와 동일한 규격을 갖는 정상직류모터의 정격회전속도와 비교하여 상기 기본주파수속도값과 상기 정격회전속도와의 차가 상기 검사모터의 종류 및 소정의 검사오차범위에 따라 결정되는 기준속도차보다 큰 경우 상기 검사모터가 고장난 것으로 판단하는 모터고장판단부를 포함하는 것을 특징으로 하는 직류모터의 고장검사장치에 의해 달성된다.On the other hand, the object of the present invention is a pair of brushes connected to the motor drive power source through a power line and at least two or more armature coils arranged to link with the magnetic flux of the stator field and the magnetic field generating stator field in accordance with another field of the present invention And a plurality of commutators sequentially connecting the armature coil to the brush to generate a rotating magnetic field interposed between the brush and the armature coil to generate a rotating force by interacting with the stator field. A motor current detector for detecting a motor current flowing through a power supply line of the inspection motor; A basic current frequency determining unit for determining a fundamental frequency (F1) of the motor harmonic function current component constituting the motor current; Substituting the basic frequency (F1) and the number (C) of the commutator of the motor harmonic function current component into the equation F1 ÷ C to calculate the basic frequency speed value, and the basic frequency speed value is the same standard as the test motor When the difference between the basic frequency speed value and the rated rotation speed is greater than the reference speed difference determined according to the type of the inspection motor and a predetermined inspection error range, compared to the rated rotation speed of the normal DC motor having the It is achieved by the failure inspection apparatus of the DC motor, characterized in that it comprises a motor failure judging judged to be.
여기서, 상기 전원선에 흐르는 모터전류 대신 상기 측정모터의 전원선에 분압저항을 직렬로 연결하고 상기 분압저항에 인가되는 모터전압을 검출함으로써 본 발명의 목적을 달성할 수 있다.Here, the object of the present invention can be achieved by connecting a voltage divider in series with the power line of the measurement motor instead of the motor current flowing through the power line and detecting the motor voltage applied to the voltage divider.
그리고 검사시간을 단축할 수 있도록, 상기 전류기본주파수결정부는, 상기 검사모터의 종류 및 상기 검사오차범위에 따라 결정되는 샘플링주파수로 상기 모터전류를 샘플링하는 모터전류샘플링부와, 상기 모터조화함수전류성분의 기본주파수(F1)가 결정되도록 상기 샘플링된 모터전류를 고속푸리에변환하는 전류푸리에변환부를 포함하도록 구성할 수 있다.The current basic frequency determining unit may include a motor current sampling unit that samples the motor current at a sampling frequency determined according to the type of the inspection motor and the inspection error range, and the motor conditioning function current. And a current Fourier transform unit for fast Fourier transforming the sampled motor current so that the fundamental frequency F1 of the component is determined.
이하에서, 첨부도면을 참조하여 본 발명을 상세히 설명하기로 한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
도1은 본 발명의 실시예에 따른 직류모터의 고장검사장치의 기능별 블록도이다.1 is a functional block diagram of a failure inspection apparatus of a DC motor according to an embodiment of the present invention.
본 발명의 실시예에 따른 직류모터의 고장검사장치는, 도1에 도시된 바와 같이, 검사모터(5)에 흐르는 모터전류를 전원선(6)으로부터 검출하는 모터전류검출부(11)와, 모터전류검출부(11)에서 검출한 모터전류에 기초하여 검사모터(5)의 동작상태를 판단하여 모터동작상태표시장치(10)에 표시하는 중앙처리장치(21)를 갖고 있다.The failure inspection apparatus of the DC motor according to the embodiment of the present invention, as shown in Figure 1, the motor current detection unit 11 for detecting the motor current flowing in the inspection motor 5 from the power supply line 6, and the motor The central processing unit 21 determines the operation state of the inspection motor 5 based on the motor current detected by the current detection unit 11 and displays it on the motor operation state display device 10.
중앙처리장치(21)는 모터전류검출부(11)에서 검출한 아날로그 모터전류를 구성하는 모터조화함수전류성분의 기본주파수를 결정하는 전류기본주파수결정부(41)와 전류기본주파수결정부(41)에서 결정된 모터조화함수전류성분의 기본주파수에 기초하여 검사모터(5)의 고장여부를 판단하는 모터고장판단부(31)를 갖고 있다.The central processing unit 21 includes a current basic frequency determining unit 41 and a current basic frequency determining unit 41 for determining the basic frequency of the motor conditioning function current component constituting the analog motor current detected by the motor current detecting unit 11. The motor failure determining unit 31 determines whether the inspection motor 5 has failed or not based on the fundamental frequency of the motor harmonization function current component determined in Figs.
전류기본주파수결정부(41)는 모터전류검출부(11)에서 검출한 모터전류를 소정주파수로 샘플링(Sampling)하는 모터전류샘플링부(43)와 샘플링된 모터전류에 대하여 고속푸리에변환(FFT : Fast Fourier Transform)을 시행하는 전류푸리에변환부(45)를 갖고 있다. 여기서 모터전류의 샘플링주파수는 측정모터(5)의 종류 및 측정오차범위에 따라 결정된다. 즉, 측정모터(5)의 정류자 개수가 많거나 측정오차범위가 작은 경우 샘플링주파수를 크게 설정한다. 그리고 모터고장판단부(31)는 검사모터(5)의 기본주파수속도값을 산출하는 기본주파수속도값산출부(35)와 기본주파수속도값을 검사모터(5)와 동일한 규격을 갖는 직류모터(이하 정상직류모터라 함)의 정격회전속도와 비교하는 기본주파수속도값비교부(33)를 갖고 있다. 여기서, 기본주파수속도값산출부(35)는 후술하는 메모리(8)에 저장된 F1÷C에 모터조화함수전류성분의 기본주파수(F1) 및 검사모터(5)의 정류자의 개수(C)를 대입하여 기본주파수속도값을 산출한다.The current basic frequency determining unit 41 performs fast Fourier transform (FFT: Fast) on the motor current sampling unit 43 and the sampled motor current, which sample the motor current detected by the motor current detecting unit 11 at a predetermined frequency. And a current Fourier transform section 45 for Fourier transform. Here, the sampling frequency of the motor current is determined according to the type of measurement motor 5 and the measurement error range. That is, when the number of commutators in the measurement motor 5 is large or the measurement error range is small, the sampling frequency is set large. And the motor failure determination unit 31 has a basic frequency speed value calculation unit 35 for calculating the basic frequency speed value of the inspection motor 5 and the basic frequency speed value DC motor having the same specifications as the inspection motor 5 ( The basic frequency speed value comparing part 33 is compared with the rated rotation speed of the normal direct current motor). Here, the basic frequency speed value calculation unit 35 substitutes the basic frequency F1 of the motor harmonic function current component and the number C of commutators of the inspection motor 5 into F1 ÷ C stored in the memory 8 to be described later. Calculate the basic frequency speed value by
기본주파수속도값(F1÷C)은 검사모터(5)가 양품인 경우에는 검사모터(5)의 초당 실제회전속도를 나타내나 검사모터(5)가 불량품인 경우에는 그렇지 아니하다. 이를 상세히 설명하면 다음과 같다.The basic frequency speed value (F1 ÷ C) represents the actual rotational speed of the inspection motor 5 per second when the inspection motor 5 is a good product, but not when the inspection motor 5 is a defective product. This will be described in detail as follows.
검사모터(5)가 양품인 경우 검사모터(5)가 회전함에 따라 복수의 정류자들이 순차적으로 브러시와 접촉되었다가 분리되는 것을 반복하고, 이 접촉 및 분리현상은 전원선(6)에 흐르는 모터전류의 변화로 나타난다. 즉, 브러시가 정류자들사이의 절연부재를 통과할 때 모터전류는 최소가 된다. 그리고 브러시와 정류자가 접촉되면 접촉면적이 점점 증가하여 접촉저항이 점점 작아지고, 모터전류는 증가한다. 브러시와 정류자사이의 접촉저항이 최소가 될 때 모터전류는 최대가 된다. 그리고 브러시와 정류자사이의 접촉저항이 최소가 된 후에는 다시 접촉저항이 증가하고, 모터전류는 감소한다. 브러시가 인접하는 다른 절연부재에 접촉할 때 모터전류는 최소가 된다. 이러한 모터전류의 파형변화는 직류모터가 1회전하는 동안 정류자의 개수만큼 일어난다. 따라서, 모터조화함수전류성분의 기본주파수는 검사모터(5)의 초당 회전속도에 정류자의 개수를 곱한 값이 된다. 역으로 검사모터(5)가 양품인 경우 모터조화함수전류성분의 기본주파수를 정류자의 개수로 나누면 검사모터(5)의 초당 실제회전속도를 구할 수 있다.When the inspection motor 5 is a good product, as the inspection motor 5 rotates, a plurality of commutators are sequentially contacted with the brush and then separated, and this contact and separation phenomenon is a motor current flowing through the power line 6. Appears as a change of. In other words, the motor current is minimal when the brush passes through the insulating member between the commutators. When the brush and the commutator come into contact with each other, the contact area gradually increases, the contact resistance decreases gradually, and the motor current increases. The motor current is maximum when the contact resistance between the brush and the commutator is minimum. After the contact resistance between the brush and the commutator becomes minimum, the contact resistance increases again and the motor current decreases. The motor current is minimal when the brush is in contact with another adjacent insulating member. The waveform change of the motor current occurs as many as the number of commutators during one revolution of the DC motor. Therefore, the fundamental frequency of the motor harmonic function current component is a value obtained by multiplying the rotational speed per second of the inspection motor 5 by the number of commutators. Conversely, when the inspection motor 5 is a good product, dividing the fundamental frequency of the motor harmonic function current component by the number of commutators can obtain the actual rotational speed per second of the inspection motor 5.
한편, 검사모터(5)가 정류자의 결함, 전기자코일의 결함 등을 갖고 있는 불량품인 경우 모터전류는 결함부분에 대응하는 부분에서 왜곡된다. 모터전류의 왜곡에 의해 모터전류의 주기는 검사모터(5)가 양품인 경우보다 커지고 기본주파수는 작아진다. 그러므로 검사모터(5)가 불량품인 경우 모터조화함수전류성분의 기본주파수를 정류자의 개수로 나누어도 검사모터(5)의 초당 실제회전속도를 구할 수 없다.On the other hand, when the inspection motor 5 is a defective product having a defect of a commutator, an armature coil, or the like, the motor current is distorted at a portion corresponding to the defective portion. Due to the distortion of the motor current, the period of the motor current is larger than that of the inspection motor 5 in good condition, and the fundamental frequency becomes smaller. Therefore, when the inspection motor 5 is defective, the actual rotational speed per second of the inspection motor 5 cannot be obtained even if the fundamental frequency of the motor harmonic function current component is divided by the number of commutators.
따라서, 검사모터(5)의 기본주파수속도값을 정상직류모터의 정격회전속도와 비교하여 검사모터(5)의 고장여부를 판단할 수 있다.Therefore, it is possible to determine whether the inspection motor 5 is broken by comparing the basic frequency speed value of the inspection motor 5 with the rated rotational speed of the normal DC motor.
한편, 중앙처리장치(21)에는 검사모터(5)의 정류자의 개수정보를 디지탈값으로 입력하기 위한 정류자정보입력장치(9)와 중앙처리장치(21)에서 결정된 검사모터(5)의 실제회전속도를 외부에 표시하기 위한 모터동작상태표시장치(10)와 중앙처리장치(21)에서 행하는 검사모터(5)의 회전속도산출에 필요한 정보를 저장하는 메모리(8)가 각각 연결되어 있다. 메모리(8)에는 F1÷C연산을 수행하는 프로그램, 정상직류모터의 정격회전속도정보 및 기준속도차정보가 저장되어 있다. 메모리(8)에 저장되는 기준속도차는 검사모터(5)의 종류 및 소정의 검사오차범위에 따라 결정되는 바, 검사모터(5)의 정격회전속도범위 또는 검사오차범위가 작을수록 작은 값을 가지도록 설정하는 것이 바람직하다. 한편, 검사모터(5)에는 전원선(6)을 통해 모터구동전압을 공급하는 모터전원공급장치(7)가 연결되어 있다.On the other hand, the central processing unit 21 actually rotates the inspection motor 5 determined by the commutator information input device 9 and the central processing unit 21 for inputting the digital information of the number of commutators of the inspection motor 5. The motor operation state display device 10 for displaying the speed to the outside and the memory 8 for storing information necessary for calculating the rotational speed of the inspection motor 5 performed by the central processing unit 21 are connected. The memory 8 stores a program for performing the F1 ÷ C operation, the rated rotational speed information and the reference speed difference information of the normal DC motor. The reference speed difference stored in the memory 8 is determined according to the type of inspection motor 5 and a predetermined inspection error range, and the smaller the rated rotation speed range or inspection error range of the inspection motor 5 is, the smaller the value is. It is preferable to set so that it is. On the other hand, a motor power supply 7 for supplying a motor driving voltage through the power line 6 is connected to the inspection motor 5.
이러한 구성을 갖는 본 발명의 실시예에 따른 직류모터의 고장검사장치를 사용하여 고장검사를 행하는 방법을 도 2내지 도4를 참조하여 설명하면 다음과 같다.Referring to FIGS. 2 to 4, a method of performing a failure inspection using a failure inspection apparatus for a DC motor having the above configuration will be described below.
도2는 본 발명의 실시예에 따른 직류모터의 고장검사방법을 도시한 흐름도이고, 도3은 도2의 S30의 세부흐름도이며, 도4는 도2의 S40의 세부흐름도이다.2 is a flowchart illustrating a failure inspection method of a DC motor according to an exemplary embodiment of the present invention, FIG. 3 is a detailed flowchart of S30 of FIG. 2, and FIG. 4 is a detailed flowchart of S40 of FIG. 2.
먼저 검사모터(5)에 전원선(6)을 통해 구동전압을 공급하고, 측정자는 정류자정보입력장치(9)를 통해 검사모터(5)의 정류자의 개수를 입력한다(S10).First, the driving voltage is supplied to the test motor 5 through the power line 6, and the measurer inputs the number of commutators of the test motor 5 through the commutator information input device 9 (S10).
다음에 전원선(6)을 흐르는 모터전류를 검출한다(S20).Next, the motor current flowing through the power supply line 6 is detected (S20).
다음에 모터전류를 구성하는 모터조화함수전류성분의 기본주파수를 구한다(S30). 이 기본주파수는 검출한 모터전류를 샘플링하고(S31), 샘플링된 모터전류에 고속푸리에변환을 시행하여 구할 수 있다(S33).Next, the fundamental frequency of the motor harmonic function current component constituting the motor current is obtained (S30). The fundamental frequency can be obtained by sampling the detected motor current (S31) and performing a fast Fourier transform on the sampled motor current (S33).
다음에 정상직류모터의 정격회전속도, 모터조화함수전류성분의 기본주파수(F1)와 정류자의 개수(C)에 기초하여 검사모터(5)의 고장여부를 판단한다(S40). 즉, 검사모터(5)의 모터조화함수전류성분의 기본주파수를 F1÷C에 대입하여 기본주파수속도값을 산출하고(S41), 산출한 기본주파수속도값을 정상직류모터의 정격회전속도와 비교하여 그 차가 메모리(8)에 저장된 기준속도차보다 큰 경우 검사모터가 고장난 것으로 판단한다(S43).Next, it is determined whether the inspection motor 5 is faulty based on the rated rotational speed of the normal DC motor, the fundamental frequency F1 of the motor conditioning function current component, and the number of commutators C (S40). That is, the basic frequency speed value is calculated by substituting the fundamental frequency of the motor coordination function current component of the inspection motor 5 into F1 ÷ C (S41), and comparing the calculated basic frequency speed value with the rated rotation speed of the normal DC motor. If the difference is greater than the reference speed difference stored in the memory 8, it is determined that the inspection motor has failed (S43).
마지막으로 검사모터(5)의 고장상태를 모터동작상태표시장치(10)를 통해 표시한다.Finally, the failure state of the inspection motor 5 is displayed through the motor operation state display device 10.
상술한 실시예에서는 고속푸리에변환에 의해 모터조화함수전류성분의 기본주파수를 결정하고 있으나, DFT(Discrete Fourier Transform) 등의 방법을 사용할 수 있음은 물론이다.In the above-described embodiment, the fundamental frequency of the motor coordination function current component is determined by the fast Fourier transform, but a method such as a Discrete Fourier Transform (DFT) may be used.
그리고 상술한 실시예에서는 정류자개수를 외부로부터 입력하도록 하고 있으나, 미리 검사모터(5)의 정류자개수를 메모리(8)에 저장하여 본 발명을 실시할 수있다.In the above-described embodiment, the number of commutators is inputted from the outside, but the present invention can be implemented by storing the number of commutators of the inspection motor 5 in the memory 8 in advance.
또한 상술한 실시예에서는 검사모터(5)의 초당 회전속도를 구하고 있으나 F1÷C를 적절히 변형함으로써 분당 회전속도, 시간당 회전속도를 구할 수 있음은 물론이다.In addition, in the above-described embodiment, the rotational speed per second of the inspection motor 5 is obtained, but the rotational speed per minute and the rotational speed per hour can be obtained by appropriately modifying F1 ÷ C.
한편, 상술한 실시예에서는 검사모터(5)의 전원선에 흐르는 모터전류를 검출하여 검사모터(5)의 실제회전속도를 구하고 있으나, 검사모터(5)의 전원선에 분압저항을 직렬로 연결하고 분압저항에 인가되는 모터전압을 검출하여 검사모터(5)의 고장여부를 검사할 수 있다.Meanwhile, in the above-described embodiment, the actual rotation speed of the test motor 5 is obtained by detecting the motor current flowing through the power line of the test motor 5, but the voltage divider is connected in series to the power line of the test motor 5. Then, by detecting the motor voltage applied to the voltage dividing resistor, it is possible to check whether the inspection motor 5 is broken.
따라서, 본 발명에 따르면, 직류모터의 고장검사를 함에 있어서, 고장검사결과에 대한 신뢰성을 향상시킬 수 있을 뿐만 아니라 검사시간을 단축시킬 수 있게 된다.Therefore, according to the present invention, in performing a failure inspection of the DC motor, the reliability of the failure inspection result can be improved and the inspection time can be shortened.
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