CN111856268A - Motor and generator fault diagnosis system based on harmonic method - Google Patents
Motor and generator fault diagnosis system based on harmonic method Download PDFInfo
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- CN111856268A CN111856268A CN201910332143.5A CN201910332143A CN111856268A CN 111856268 A CN111856268 A CN 111856268A CN 201910332143 A CN201910332143 A CN 201910332143A CN 111856268 A CN111856268 A CN 111856268A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to the technical field of motors and generators, and discloses a motor and generator fault diagnosis system based on a harmonic method. According to the motor and generator fault diagnosis system based on the harmonic method, real-time data under the operation state of the motor and the generator are acquired by using non-contact current harmonics, the harmonics are integral multiples of basic frequencies and have regularity, the frequencies and noise are often mixed together under the general condition, the harmonics generally comprise fractional harmonics of fundamental waves, the frequency band is about 3 KHz-3.6 KHz, and the frequency is alternating current of a frequency band with the KHz grade from 10 KHz.
Description
Technical Field
The invention relates to the technical field of motors and generators, in particular to a motor and generator fault diagnosis system based on a harmonic method.
Background
In recent years, various industries have gradually introduced a great deal of various high-performance and high-efficiency motor and generator equipment, and then combined with a high-performance automation system to realize large-scale power transmission and production, which usually require continuous operation, if the motor and generator equipment fails and stops operating, the breakdown of the whole power transmission line and the production line stop are likely to occur, the production order is destroyed, the loss is inestimable, and even other fatal problems are likely to occur, on the other hand, measures for improving equipment investment and strengthening equipment maintenance are taken to ensure stable operation of the equipment, and the resulting maintenance cost and corresponding labor cost account for a small proportion of the production cost.
For example, chinese patent CN 102998574B relates to a fault detection system for a resolver of a driving engine for a vehicle, which uses sin and cos signals to calculate a fault detection signal, and detects a fault state of a signal line of the resolver caused by an open circuit or a short circuit, and compared with the conventional method, the system has a shorter time without a limit on the speed of the driving engine, but cannot perform long-term tracking and maintenance, and reduces the safety guarantee for the operation of the equipment of the motor and the generator, so a fault diagnosis system for the motor and the generator based on a harmonic method is provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a motor and generator fault diagnosis system based on a harmonic method, which has the advantages of long-term tracking and maintenance and the like, and solves the problem that the existing electrical detection system cannot track and maintain equipment for a long time, so that the safety guarantee for the running of the engine and generator equipment is reduced.
(II) technical scheme
In order to realize the purpose of long-term tracking and maintenance, the invention provides the following technical scheme: the motor and generator fault diagnosis system based on the harmonic method comprises a current detection part, wherein the output end of the current detection part is electrically connected with the input end of a switcher, the input end of the switcher is electrically connected with the output end of a magnetic field detection part, the input end of a selective amplification circuit is electrically connected with the output end of the switcher, the output end of the selective amplification circuit is electrically connected with the input end of an A/D converter, the output end of the A/D converter is electrically connected with the input end of an output circuit, the input ends of the output circuit and the A/D converter are electrically connected with the output end of a sequence control circuit, the input end of the sequence control circuit is electrically connected with the output end of a waveform selection circuit, the input end of the waveform selection circuit is electrically connected with the output end of an address generation counter, and the output end of the sequence control circuit is respectively, the output end of the output circuit is electrically connected with the input end of the central processing unit, the central processing unit is electrically connected with the program memory circuit in a bidirectional mode, the central processing unit is respectively electrically connected with the address generation counter and the waveform memory circuit in a bidirectional mode, the central processing unit is respectively electrically connected with the output port, the input port, the auxiliary memory circuit and the main memory computer in a bidirectional mode, the output end of the output port is electrically connected with the input end of the display device, and the input end of the input port is electrically connected with the output end of the operation device.
Preferably, the selective amplifier circuit is selectively amplified according to a signal level measured by the current detector or the magnetic field detector, and the a/D converter converts an analog signal output from the selective amplifier circuit into a digital signal.
Preferably, the output circuit transmits data at 20a to the arithmetic processing unit as a signal, the waveform memory circuit stores the contents thereof as arithmetic data under the control of the CPU21, and the auxiliary memory circuit stores operation data of the electric devices described later, such as a device constant number, a voltage coefficient, a high-order wave measure coefficient, and the like, and sets conditions of a rated value and an operation value of the electric devices, and the input of the set value is realized through the input port.
Preferably, the output port outputs the operation result of the CPU21 to the outside, and has a display device for driving the LCD, printer, etc. to operate by an output signal, the address generation counter uses 2 kinds of 8-bit up-down counters, and can generate a total address of 16 bits due to the high 8 bits and the low 8 bits, and the address generation counter has the functions of (i) inputting a measurement waveform, (ii) outputting the measurement waveform, and (iii) transmitting a program.
Preferably, the sequence control circuit repeats the operation steps of transferring the waveform data to the waveform memory circuit, restarting the address generation counter, and transferring the waveform data in the waveform memory circuit to the CPU21 after receiving the start instruction, and the waveform address selection circuit selects the waveform address area according to the operation of the address generation counter.
Another technical problem to be solved by the present invention is to provide a motor and generator fault diagnosis system based on a harmonic method, comprising the steps of:
1) selecting a diagnosis object through a switcher, connecting the power generation force and the power generator with the input port, and calling a corresponding measurement module in the central processing unit by using an operation device;
2) measuring the total harmonic distortion rate of the engine and the generator connected with the system in the step 1) through a waveform memory circuit and a central processing unit, setting the number of harmonic times of the total harmonic distortion rate to be measured to be 2 times to 40 times, and dividing the harmonic content rate of each number of times by the total harmonic distortion rate to obtain an index THk;
3) judging the index THk obtained in the step 2), calling CHk in a main memory circuit through an operation processing device, comparing the CHk with the THk, and storing the result, wherein the CHk is the judgment reference of K-th harmonic;
4) Calculating the result judged in the step 3) through a central processing unit, judging whether the result is in a degradation state or not, if the result is not in the degradation state, displaying the result to be normal, if the result belongs to the situation that the central processing unit calls a central processing unit to compare databases, generating a data comparison graph and storing the data comparison graph;
5) and 4) carrying out operation prediction analysis on the data generated in the step 4) compared with the graph, storing the result and displaying or printing the result through a display device.
(III) advantageous effects
Compared with the prior art, the invention provides a motor and generator fault diagnosis system based on a harmonic method, which has the following beneficial effects:
1. the motor and generator fault diagnosis system based on the harmonic method collects real-time data under the running state of the motor and the generator by using non-contact current harmonics, the harmonics refer to integral multiples of basic frequency and have regularity, the frequency and noise are often mixed together under general conditions, but the common harmonics include fractional harmonics of fundamental waves, the frequency is alternating current of a frequency band with the frequency grade of KHz from 10KHz and refers to continuously generated alternating current, the harmonics can be generated in a rotary machine such as the generator and the motor through space harmonics in principle, detection data does not need to be analyzed on site by professional personnel, a detection report can be directly sent out through a central processing device after detection is finished, early warning and generation of trend graphs of the health state of the engine and the generator can be realized in advance, and the technology can not influence the normal running of equipment, the abnormal states of corresponding parts of the engine and the generator are judged, the detection result directly reflects the running conditions of the engine and the generator, the degradation trend of the engine and the generator can be known by observing the trend graph, the abnormal or degradation problem is distinguished, the purpose of predicting the abnormal parts of the engine and the generator is achieved, early warning is carried out in advance, a maintenance plan is proposed, and the occurrence of emergency is prevented.
2. The motor and generator fault diagnosis system based on the harmonic method adopts the harmonic technology to diagnose the aging of the engine and the generator, utilizes a central processing unit to track and maintain equipment for a long time, collects and analyzes diagnosis data according to time series, generates a detection report, prolongs the equipment replacement period, reduces the point inspection and adjustment of the equipment, realizes the purpose of predicting abnormal parts of the engine and the generator, further pre-warns and proposes a maintenance plan in advance, can diagnose the motor and the generator in a live state in the whole detection process, can diagnose the initial insulation degradation of the windings of the motor and the generator in the live state, can detect the equipment in the running state, can better reflect the fault conditions of electromechanical equipment and a load part, can simultaneously detect the electrical part and the mechanical part by a fault harmonic detector, and realizes the integral control of the equipment, the detection data does not need to be analyzed on site by professional personnel, and a detection report can be directly sent out after the detection is finished, so that the detection is more convenient.
Drawings
FIG. 1 is a block diagram of a harmonic-based frequency converter and power capacitor fault diagnosis system proposed by the present invention;
FIG. 2 is a flow chart of the frequency converter and power capacitor fault diagnosis system based on the harmonic method according to the present invention;
FIG. 3 is a flow chart of the logic of the online fault diagnosis system based on the harmonic method.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a motor and generator fault diagnosis system based on a harmonic method includes a current detection part having an output terminal electrically connected to an input terminal of a switch, an input terminal electrically connected to an output terminal of a magnetic field detection part, and an input terminal of a selective amplification circuit electrically connected to an output terminal of the switch, wherein the selective amplification circuit corresponds to a signal level measured by the current detection part or the magnetic field detection part and selectively amplifies the signal level, an output terminal of the selective amplification circuit is electrically connected to an input terminal of an a/D converter, the a/D converter converts an analog signal output from the selective amplification circuit into a digital signal, an output terminal of the a/D converter is electrically connected to an input terminal of an output circuit, and the output circuit transmits data at 20a as a signal to an arithmetic processing unit, the input ends of the output circuit and the A/D converter are electrically connected with the output end of the sequence control circuit, the sequence control circuit repeats the following operation steps after receiving a start instruction, waveform data are transmitted to the waveform memory circuit, the address generation counter is restarted, and the waveform data in the waveform memory circuit are transmitted to the CPU21, in addition, the waveform address selection circuit selects a waveform address area according to the operation of the address generation counter, the input end of the sequence control circuit is electrically connected with the output end of the waveform selection circuit, the input end of the waveform selection circuit is electrically connected with the output end of the address generation counter, the address generation counter uses 2 types of 8-bit up-down counters, because the upper 8 bits are lower 8 bits, a total 16-bit address can be produced, the address generation counter has the functions of firstly inputting a measured waveform, secondly outputting a measured waveform and thirdly program transmitting, the output end of the sequence control circuit is respectively electrically connected with the input ends of an address generation counter and a waveform memory circuit, the content of the waveform memory circuit is stored as operation data through the control of a CPU21, the output end of the output circuit is electrically connected with the input end of a central processing unit, the central processing unit is bidirectionally electrically connected with a program memory circuit, the central processing unit is respectively electrically connected with the address generation counter and the waveform memory circuit in two directions, the central processing unit is respectively electrically connected with an output port, an input port, an auxiliary memory circuit and a main memory computer in two directions, real-time data under the operation state of the motor and the generator are collected by applying non-contact current harmonics, the harmonics refer to integral multiples of basic frequency and have regularity, the frequency and noise are always mixed together under normal conditions, but the harmonics include fractional harmonics of fundamental waves, the technology can judge the abnormal state of the corresponding parts of the engine and the generator under the condition of not influencing the normal operation of the equipment, the detection result directly reflects the operation state of the engine and the generator, the degradation trend of the engine and the generator can be known by observing the trend graph, the abnormal or degradation problem can be distinguished, the purpose of predicting the abnormal parts of the engine and the generator is realized, and then early warning and maintenance plan is early warned in advance, and the occurrence of sudden events is prevented, the auxiliary memory circuit stores the operation data of the electric equipment, such as the equipment fixed number, the voltage coefficient, the high-order wave measure coefficient and the like, and sets the rated value and the operation value of the electric equipment, at the moment, the input of the set value is realized through an input port, the output end of the output port is electrically connected with the input end of a display device, the input end of the input port is electrically connected with the output end of an operation device, the output port outputs the operation result of the CPU21 to the outside, and has a display device which drives the LCD, the printer and the like to work through an output signal, the aging of the engine and the generator is diagnosed by adopting the harmonic technology, the equipment is tracked and maintained for a long time by utilizing the central processing unit, the diagnosis data is collected and analyzed according to time series, a detection report is generated, the equipment replacement period, the purpose of predicting abnormal positions of the engine and the generator is achieved, early warning is further achieved, a maintenance plan is proposed, the whole detection process can be diagnosed in a charged mode under the working states of the motor and the generator, initial insulation degradation of windings of the motor and the generator can be diagnosed in the charged state, detection is conducted under the running state of equipment, the fault conditions of electromechanical equipment and a load part can be reflected better, a fault harmonic detector can detect an electrical part and a mechanical part simultaneously, integral control over the equipment is achieved, detection data do not need field analysis of professionals, a detection report can be directly sent out after detection is completed, and the detection is more convenient.
Referring to fig. 2, another technical problem to be solved by the present invention is to provide a fault diagnosis system for motors and generators based on the harmonic method, comprising the following steps:
1) selecting a diagnosis object through a switcher, connecting the power generation force and the power generator with the input port, and calling a corresponding measurement module in the central processing unit by using an operation device;
2) measuring the total harmonic distortion rate of the engine and the generator connected with the system in the step 1) through a waveform memory circuit and a central processing unit, setting the number of harmonic times of the total harmonic distortion rate to be measured to be 2 times to 40 times, and dividing the harmonic content rate of each number of times by the total harmonic distortion rate to obtain an index THk;
3) judging the index THk obtained in the step 2), calling CHk in a main memory circuit through an operation processing device, comparing the CHk with the THk, and storing the result, wherein the CHk is the judgment reference of K-th harmonic;
4) calculating the result judged in the step 3) through a central processing unit, judging whether the result is in a degradation state or not, if the result is not in the degradation state, displaying the result to be normal, if the result belongs to the situation that the central processing unit calls a central processing unit to compare databases, generating a data comparison graph and storing the data comparison graph;
5) and 4) carrying out operation prediction analysis on the data generated in the step 4) compared with the graph, storing the result and displaying or printing the result through a display device.
Referring to fig. 3, in the motor and generator fault diagnosis system based on the harmonic method, it is preferable that the current is measured by the current detection unit, and the clamp device is in a non-contact state, but it is also preferable that the magnetic flux amount is measured by the magnetic field detection unit using a search coil inductor, a hall sensor, a magnetoresistive sensor, or the like, and since the generated magnetic flux is proportional to the current measured by the current detection unit, it is convenient and economical to measure by the magnetic field detection unit instead of the magnetic flux of the measured current, the switching between the current detection unit and the magnetic field detection unit is realized by the switching S, the signal processing unit communicates with the arithmetic processing unit 20 by a data signal at 20a, and 24a is an input signal indicating condition setting data input to the arithmetic processing unit by the operation unit.
In summary, real-time data under the operation state of the motor and the generator is acquired by using non-contact current harmonics, the harmonics are integral multiples of basic frequencies and have regularity, generally, the frequencies and noise are often mixed together, but generally, the harmonics comprise fractional harmonics of fundamental waves, the frequency is alternating current of a frequency band with the KHz grade from 10KHz to about 3.6KHz, the frequency is alternating current which is continuously generated, the harmonics can be generated by spatial harmonics in a rotating machine such as the generator and the motor in principle, detection data does not need field analysis of professional personnel, a detection report can be directly output by a central processing device after detection is finished, early warning and trend graph generation on the health state of the engine and the generator can be realized in advance, and the technology judges the abnormal state of corresponding parts of the engine and the generator under the condition that normal operation of equipment is not influenced, the detection result directly reflects the running conditions of the engine and the generator, the degradation trend of the engine and the generator can be known by observing the trend graph, the abnormal or degradation problem can be distinguished, the purpose of predicting the abnormal parts of the engine and the generator is achieved, and then early warning and maintenance plan are provided in advance, and the occurrence of emergency events is prevented.
Moreover, the aging of the engine and the generator is diagnosed by adopting a harmonic technology, the equipment is tracked and maintained for a long time by using a central processing unit, diagnosis data is collected and analyzed according to time series, a detection report is generated, the replacement period of the equipment is prolonged, the point inspection and adjustment of the equipment are reduced, the purpose of predicting abnormal parts of the engine and the generator is realized, further, early warning and maintenance plan are given out, the whole detection process can be diagnosed in a charged state under the working state of the motor and the generator, the initial insulation degradation of the winding of the motor and the generator is diagnosed in the charged state, the fault condition of the electromechanical equipment and a load part can be better reflected by detecting in the running state of the equipment, a fault harmonic detector can simultaneously detect the electrical part and the mechanical part, the integral control of the equipment is realized, the detection data does not need the field analysis of professional, and the detection report can be directly, more convenient.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. Motor and generator fault diagnosis system based on harmonic method includes current detection portion, its characterized in that: the output end of the current detection part is electrically connected with the input end of the switcher, the input end of the switcher is electrically connected with the output end of the magnetic field detection part, the input end of the selective amplification circuit is electrically connected with the output end of the switcher, the output end of the selective amplification circuit is electrically connected with the input end of the A/D converter, the output end of the A/D converter is electrically connected with the input end of the output circuit, the input ends of the output circuit and the A/D converter are electrically connected with the output end of the sequence control circuit, the input end of the sequence control circuit is electrically connected with the output end of the waveform selection circuit, the input end of the waveform selection circuit is electrically connected with the output end of the address generation counter, the output end of the sequence control circuit is electrically connected with the input ends of the address generation counter and the waveform memory circuit respectively, the central processing unit is respectively and bidirectionally electrically connected with the address generation counter and the waveform memory circuit, the central processing unit is respectively and bidirectionally electrically connected with the output port, the input port, the auxiliary memory circuit and the main memory computer, the output end of the output port is electrically connected with the input end of the display device, and the input end of the input port is electrically connected with the output end of the operating device.
2. The harmonic-based motor and generator fault diagnosis system according to claim 1, characterized in that: the selective amplifier circuit is selectively amplified according to the signal level measured by the current detector or the magnetic field detector, and the a/D converter converts an analog signal output from the selective amplifier circuit into a digital signal.
3. The harmonic-based motor and generator fault diagnosis system according to claim 1, characterized in that: the output circuit transmits data at 20a to the arithmetic processing unit as a signal, the waveform memory circuit stores the contents thereof as arithmetic data under the control of the CPU21, and the auxiliary memory circuit stores operation data of the electric devices described later, such as a device constant number, a voltage coefficient, a high-order wave countermeasure coefficient, and the like, and sets conditions of a rated value and an operation value of the electric devices, and inputs of the set values are realized through the input port.
4. The harmonic-based motor and generator fault diagnosis system according to claim 1, characterized in that: the output port outputs the operation result of CPU21 to outside, and has display device for driving LCD and printer via output signal, the address generating counter uses 2 kinds of 8-bit up-down counters, and can generate 16-bit address due to 8 bits higher and 8 bits lower, and the address generating counter has the functions of inputting measured waveform, outputting measured waveform and transmitting program.
5. The harmonic-based motor and generator fault diagnosis system according to claim 1, characterized in that: after the sequence control circuit receives the start instruction, the following operation steps are repeated, the waveform data are transmitted to the waveform memory circuit, the address generation counter is restarted, and the waveform data in the waveform memory circuit are transmitted to the CPU21, and in addition, the waveform address selection circuit selects a waveform address area according to the operation of the address generation counter.
6. The harmonic-based motor and generator fault diagnosis system according to claim 1, characterized by comprising the steps of:
1) selecting a diagnosis object through a switcher, connecting the power generation force and the power generator with the input port, and calling a corresponding measurement module in the central processing unit by using an operation device;
2) measuring the total harmonic distortion rate of the engine and the generator connected with the system in the step 1) through a waveform memory circuit and a central processing unit, setting the number of harmonic times of the total harmonic distortion rate to be measured to be 2 times to 40 times, and dividing the harmonic content rate of each number of times by the total harmonic distortion rate to obtain an index THk;
3) judging the index THk obtained in the step 2), calling CHk in a main memory circuit through an operation processing device, comparing the CHk with the THk, and storing the result, wherein the CHk is the judgment reference of K-th harmonic;
4) Calculating the result judged in the step 3) through a central processing unit, judging whether the result is in a degradation state or not, if the result is not in the degradation state, displaying the result to be normal, if the result belongs to the situation that the central processing unit calls a central processing unit to compare databases, generating a data comparison graph and storing the data comparison graph;
5) and 4) carrying out operation prediction analysis on the data generated in the step 4) compared with the graph, storing the result and displaying or printing the result through a display device.
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| CN201910332143.5A CN111856268A (en) | 2019-04-24 | 2019-04-24 | Motor and generator fault diagnosis system based on harmonic method |
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| CN201910332143.5A CN111856268A (en) | 2019-04-24 | 2019-04-24 | Motor and generator fault diagnosis system based on harmonic method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030723A (en) * | 2021-03-15 | 2021-06-25 | 上海大学 | Alternating current asynchronous motor state monitoring system |
| CN114062923A (en) * | 2021-11-11 | 2022-02-18 | 中矿龙科能源科技(北京)股份有限公司 | Motor fault online advanced early warning system based on current magnetic signal and higher harmonic diagnosis technology |
| CN114236314A (en) * | 2021-12-17 | 2022-03-25 | 瀚云科技有限公司 | Fault detection method, device, equipment and storage medium |
-
2019
- 2019-04-24 CN CN201910332143.5A patent/CN111856268A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030723A (en) * | 2021-03-15 | 2021-06-25 | 上海大学 | Alternating current asynchronous motor state monitoring system |
| CN114062923A (en) * | 2021-11-11 | 2022-02-18 | 中矿龙科能源科技(北京)股份有限公司 | Motor fault online advanced early warning system based on current magnetic signal and higher harmonic diagnosis technology |
| CN114236314A (en) * | 2021-12-17 | 2022-03-25 | 瀚云科技有限公司 | Fault detection method, device, equipment and storage medium |
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Application publication date: 20201030 |