CN1166934C - Detection method of loosening slot wedge of rotating motor - Google Patents
Detection method of loosening slot wedge of rotating motor Download PDFInfo
- Publication number
- CN1166934C CN1166934C CNB021394806A CN02139480A CN1166934C CN 1166934 C CN1166934 C CN 1166934C CN B021394806 A CNB021394806 A CN B021394806A CN 02139480 A CN02139480 A CN 02139480A CN 1166934 C CN1166934 C CN 1166934C
- Authority
- CN
- China
- Prior art keywords
- slot wedge
- loosening
- slot
- rotating machine
- electric rotating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Manufacture Of Motors, Generators (AREA)
Abstract
The present invention discloses a detection method capable of detecting the looseness of a slot wedge of a large-size rotary motor, which comprises the following steps that a slot wedge of a large-size rotary motor beaten by impact force generated by an impact source is adopted; sound waves radiated under the action of the impact force of the slot wedge are received by an acoustic sensor, and the generated sound waves are sampled; signals which are collected are kept, are digitized, and then carry out data treatment; sound signals which are obtained carry out spectral analysis so that a main frequency value of the sound signals is obtained, and compared with a set threshold value, a looseness state of the slot wedge is judged. The present invention can quickly detect the looseness of the slot wedge of a large-size rotary motor, greatly saves time and manpower consumed during manual detection, and can provide rich data for the state maintenance of a large motor; the system adopts the design of an all-Chinese menu, all kinds of hardware are adjusted and controlled by the software, and the operation is convenient and visual; thereby, an operator who has no experience can also detect the looseness of the slot wedge of a large-size rotary motor in situ.
Description
One, affiliated technical field
The invention belongs to technical field of motors, relate to the Non-Destructive Testing of motor, particularly a kind of electric rotating machine slot wedge loosening detection method with corrugated plate fixed sturcture.
Two, background technology
Motor is normally in service, and particularly when suddenly-applied short circuit, the effect of transverse magnetic field makes slot bar bear sizable electromagnetic force in the electric current of stator bar and the groove.When stator bar took place to become flexible in groove, this electromagnetic force can make stator bar that electric and magnetic oscillation takes place in groove, to the insulation generation mechanical wear of line rod.Simultaneously, because contacting built on the sand between line rod surface and the groove can cause the aggravation of groove discharge, long-term corrosion line rod surface insulation.These all can quicken the deterioration of bar insulation, even accidents caused at the motor run duration, cause disorderly closedown.For this reason, stator bar embeds after the stator slot, must utilize slot wedge, filler strip etc. that it is fastening.All there has been significant improvement in various countries manufacturing plant on the slot part fixed form since the seventies in 20th century, but the phenomenon of slot wedge loosening takes place often.Therefore, the detection of slot wedge loosening has very important value to the normal operation of big motor.
For the fixed structure for slot part that uses corrugated plate, traditional slot wedge loosening detection method is artificial detection method.This method is measured the crest of corrugated plate under the slot wedge and the difference in height between the trough by the measured hole of accomplishing fluently in advance on the slot wedge, also is the aeration level that the deformation quantity of corrugated plate is estimated slot wedge.Consider the restriction of the requirement of mechanical strength and the human resources of slot wedge, big motor internal has only the part slot wedge to have measured hole, that is to say that the manual detection method of slot wedge loosening can only be carried out at porose slot wedge, rather than the big all slot wedges of motor internal.Therefore, the manual detection method can't be carried out whole detection to the state of slot wedge loosening in the big motor, and testing result influenced by human factor bigger, testing process also wastes time and energy.
Three, summary of the invention
Defective or deficiency at above-mentioned detection method existence, when the applicant detects the problem of high-rating generator major insulation ageing state in research, aging diagnostic method of the electrical machine insulation based on wavelet transformation and device thereof that the applied acoustics technology detects the major insulation ageing state of high-rating generator have been invented, and applied for Chinese patent, number of patent application: 02139425.3, September 13 2002 applying date; Purpose of the present invention is exactly to utilize the invention thought of above-mentioned patent, a kind of detection method that adopts acoustic technique to detect the large-scale electric rotating machine slot wedge loosening with corrugated plate fixed sturcture is proposed, and according to above-mentioned detection method, develop a cover digitizing slot wedge loosening detection system, this system promptly carries out the detection of slot wedge loosening at the fixed structure for slot part that uses corrugated plate.
Detection of the present invention has the detection method of the large-scale electric rotating machine slot wedge loosening of corrugated plate fixed sturcture, comprises following each step: 1) produce the stator slot wedge that impulsive force is knocked large-scale electric rotating machine by impulse source; 2) the employing sonic transducer receives the sound wave of slot wedge radiation under impact force action, and the sound wave that produces is sampled; 3) signal that collects is kept, carry out data processing after the digitizing again; The acoustical signal that obtains is carried out spectrum analysis, ask for the predominant frequency value of acoustical signal,, judge the loosening state of slot wedge with the threshold that configures.
Described spectrum analysis is that the employing fast Fourier transform (FFT) carries out spectrum analysis to acoustical signal, asks for amplitude maximum frequency value corresponding in the frequency spectrum, is the predominant frequency f of acoustical signal
M
Threshold values is that the type of the electric rotating machine that detects is as required in advance set, and comprises loosening slot wedge threshold values A
LWith fastening slot wedge threshold values A
T, when predominant frequency value by the detected acoustical signal of a certain slot wedge:
f
M〉=A
LThe time, this slot wedge can be judged to be loosening slot wedge;
f
M≤ A
T, the time, this slot wedge can be judged to be fastening slot wedge;
A
L＜f
M＜A
T, the time, this slot wedge is in loosening and fastening intermediateness, and decidable is for observing slot wedge, and should give certain attention to this slot wedge this moment.
Because detection system of the present invention adopts system controlled by computer ram hammer, the dynamics basically identical that knocks at every turn; Adopt the sonic transducer received signal, received signal is imported computing machine through after the pre-service, carries out data processing by testing software, so whole test process is all irrelevant with testing staff's state.Sonic transducer is installed in the Air Coupling chamber, and this coupling cavity noise to external world has shield effectiveness, has avoided the influence of site environment to the native system testing result.In addition, this detection system can detect all slot wedges in the whole big motor, and not only be confined to have the slot wedge of measured hole, all testing results all are presented on the LCD screen in real time, and directly say testing result by a speech chip, for the slot wedge loosening state of large-scale electric rotating machine provides comprehensively and information intuitively.Generally speaking, this detection system has been avoided many shortcomings of manual detection method, provided the data recording that to inquire about repeatedly, so that follow the tracks of the rule of each slot wedge loosening at any time, for the normal operation and the fault diagnosis of motor provide abundant more and comprehensive data greatly.System is portable, and operation interface is simple, and demonstration, storage, processing, analytic function are strong, can be conveniently used in on-the-spot the detection.
After slot wedge applied certain impulsive force, slot wedge produced vibration, outwards radiative acoustic wave.According to the vibration characteristics of plate as can be seen, the frequency of this sound wave and the boundary condition of slot wedge are closely related.After slot wedge was loosening in groove, corrugated plate did not have any deformation substantially, and slot wedge produces after being subjected to impulsive force and vibrates the sound wave that also radiation has certain frequency, and the acting force that this moment, corrugated plate was applied on the slot wedge can be ignored; When stator slot wedge is fixed tight slightly, also be that corrugated plate under the slot wedge is when a certain amount of deformation takes place, slot wedge is subjected to resilient force vertically upward, and its vibrative boundary condition under impact force action changes, and the frequency of sound wave of radiation also changes when causing slot wedge vibration; Along with slot wedge is further fastening, the deformation quantity of corrugated plate continues to strengthen under the slot wedge, and corrugated plate also strengthens the elastic force that the slot wedge bottom applies, thereby the frequency of sound wave of slot wedge vibration radiation under impact force action further changes.
Four, description of drawings
Fig. 1 is the structural drawing of electric rotating machine slot wedge loosening detection system of the present invention;
Fig. 2 is the composition of electric rotating machine slot wedge loosening detection system of the present invention; 1-impulse source 2-sound detection instrument wherein;
Fig. 3 is the impulse source structural representation;
Fig. 4 is a Control Software process flow diagram of the present invention;
Fig. 5 is that the software master interface of electric rotating machine slot wedge loosening detection system of the present invention also is the demonstration graph of one embodiment of the present of invention.
Five, embodiment
The present invention is described in further detail according to embodiment that technique scheme is finished below in conjunction with accompanying drawing and inventor.
According to the electric rotating machine slot wedge loosening detection system with corrugated plate fixed sturcture that said method is designed, this system architecture as shown in Figure 1.
The electric rotating machine slot wedge loosening detection system of development comprises impulse source, signal deteching circuit, and data processing and display unit and the numerical control plate that links to each other with each several part and control corresponding software are formed.Impulse source is by dc coil, and cavity impacts bead harmony sensor and forms; The acoustical signal testing circuit is made of pulse amplifier, sampling pulse source, sampling hold circuit and wave filter; Data processing and display unit comprise microcomputer, keyboard, D/A, A/D interface board and display.
Below the composition of this detection system is done an explanation.
Fig. 2 is the composition of this detection system.
This detection system is made up of impulse source harmony detector.
The electromagnetic force that impulse source produces when utilizing the dc coil energising is knocked rotary electric machine slot wedge surface.Sonic transducer receives the acoustical signal of slot wedge radiation under impact force action in the mode of Air Coupling, and the impulse source structural representation is the explanation to each several part in this structure as shown in Figure 3 below:
The 1st, dc coil can produce electromagnetic attraction after the energising, makes that impacting bead 3 knocks the slot wedge surface.Because it is adjustable to flow through the electric current of dc coil, the electromagnetic attraction that is produced changes with the change of this electric current, thereby impacts the impulsive force that is produced when bead knocks the slot wedge surface and also can regulate.
The 2nd, cavity is used to shield ambient noise.
The 3rd, impact bead, be used to knock the slot wedge surface, the height of this bead before knocking be vertical adjusting up and down.
The 4th, sonic transducer is used to receive the sound wave of slot wedge radiation, and the height of this sonic transducer is vertical adjusting up and down also.
The sound detection instrument has comprised signal deteching circuit, data processing and display unit and numerical control plate that links to each other with each several part and control corresponding software.This detector has been realized the control in impact source, the collection and the analog to digital conversion of acoustical signal, and the acoustical signal that collects is carried out data processing and analysis, and testing result directly is shown on the screen.
The flow process of this Control Software as shown in Figure 4.When carrying out the loosening detection of motor slot wedge, Control Software is at first carried out the initialization of hardware and software, then the data of gathering is carried out frequency domain, time domain and wavelet analysis respectively, and wherein fast Fourier transform (FFT) is adopted in frequency-domain analysis; The short-time energy analysis is adopted in time-domain analysis; Wavelet analysis adopts discrete dyadic wavelet transform, and the result is shown.When needs continue to detect, repeat said process.
Electric rotating machine slot wedge loosening detection system of the present invention can realize the detection to large-scale electric rotating machine slot wedge loosening fast, spent time and manpower when having saved manual detection greatly, and provide more rich data for the state maintenance of big motor.This system adopts full menu in Chinese design, and all hardware is regulated by software control, and is easy and simple to handle directly perceived, can make unfamiliar operating personnel also can on-the-spot carry out the detection of large-scale electric rotating machine slot wedge loosening.This system has following characteristics:
(1) intellectuality, whole detection system is easy and simple to handle, and operating personnel only need to detect instruction from the PC input, and total system can be finished detection, and is shown on the LCD screen during with fructufy, directly says testing result by a speech chip simultaneously.
(2) data can be preserved for a long time, and all previous testing result all can be deposited, and can call at any time and check, analyze to make things convenient for the technician.
(3) portable, consider the needs of rig-site utilization, native system is in light weight, is easy to carry about with one.
(4) testing result is accurate, and system all need calibrate before application at the scene, to reach the accuracy of testing result.In addition, this system begins to finish by computer control to result's output from detection, and its testing result is objective, and is with a high credibility.
(5) anti-interference, consider the interference of on-site noise, system has designed the structure that suppresses noise in signal reception place, and this system can realize software filtering and hardware filtering, both combine promptly, and effectively filtering is on-the-spot to be disturbed, and guarantees the stability and the accuracy of detection system.
Embodiment:
Fig. 5 is that electric rotating machine slot wedge loosening detection system of the present invention records stator slot wedge degree of tightness situation synoptic diagram at a machine of tafelberg Yaomeng power plant (300MW/18kV) B phase 15 grooves.One has 30 blocks of slot wedges in this motor slot, is numbered 1～No. 30.That the waveform viewing area of Fig. 5 shows is the acoustical signal figure of a certain fastening slot wedge.In the slot wedge degree of tightness integral status graphics display area in the drawings, slot wedge during the shown state of detection system shows is numbered 14,16 slot wedge, represent that this two places slot wedge becomes flexible, slot wedge during state shows is numbered slot wedge 1～No. 11, No. 16,18～No. 27, No. 29, No. 30, represent that these slot wedges are fastening, and the slot wedge in the state demonstration is numbered slot wedge 12,13,15,17, No. 28, represent that then these slot wedges are in loosening and fastening intermediateness, should give certain attention to these slot wedges this moment.According to the slot wedge degree of tightness integral status figure that computing machine provides, the technician can number make right judgement to the fastening again slot wedge of needs in conjunction with on-the-spot ruuning situation.
Claims (2)
1. a detection has the detection method of the large-scale electric rotating machine slot wedge loosening of corrugated plate fixed sturcture, comprises following each step:
1) adopts the stator slot wedge that knocks large-scale electric rotating machine by impulse source generation impulsive force;
2) the employing sonic transducer receives the sound wave of slot wedge radiation under impact force action, and the sound wave that produces is sampled;
3) signal that collects is kept, carry out data processing after the digitizing again; The acoustical signal that obtains is carried out spectrum analysis, ask for the predominant frequency value of acoustical signal,, judge the loosening state of slot wedge with the threshold that configures.
2. detection according to claim 1 has the detection method of the large-scale electric rotating machine slot wedge loosening of corrugated plate fixed sturcture, it is characterized in that, described spectrum analysis is, adopt fast fourier transform that acoustical signal is carried out spectrum analysis, ask for amplitude maximum frequency value corresponding in the frequency spectrum, be the predominant frequency f of acoustical signal
M
Threshold values is that the type of the electric rotating machine that detects is as required in advance set, and comprises loosening slot wedge threshold values A
LWith fastening slot wedge threshold values A
T, when predominant frequency value by the detected acoustical signal of a certain slot wedge:
f
M〉=A
LThe time, this slot wedge can be judged to be loosening slot wedge;
f
M≤ A
T, the time, this slot wedge can be judged to be fastening slot wedge;
A
L＜f
M＜A
T, the time, this slot wedge is in loosening and fastening intermediateness, and decidable should be noted this slot wedge for observing slot wedge this moment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021394806A CN1166934C (en) | 2002-10-22 | 2002-10-22 | Detection method of loosening slot wedge of rotating motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021394806A CN1166934C (en) | 2002-10-22 | 2002-10-22 | Detection method of loosening slot wedge of rotating motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1403793A CN1403793A (en) | 2003-03-19 |
| CN1166934C true CN1166934C (en) | 2004-09-15 |
Family
ID=4750103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021394806A Expired - Fee Related CN1166934C (en) | 2002-10-22 | 2002-10-22 | Detection method of loosening slot wedge of rotating motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1166934C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103154757B (en) | 2010-10-07 | 2016-01-20 | Abb研究有限公司 | The detection of the stator slot wedge lacked in motor |
| CN104020001A (en) * | 2014-05-26 | 2014-09-03 | 中国水电建设集团甘肃能源投资有限公司 | Method for detecting loosening of a generator stator slot wedge through Leeb hardness tester |
| CN104819738B (en) * | 2015-04-21 | 2017-06-16 | 嘉兴海格力思电子科技有限公司 | The method that sensor construction loosens detection |
| CN105387835A (en) * | 2015-11-04 | 2016-03-09 | 上海电气电站设备有限公司 | Power generator stator groove wedge caulking degree intelligent measurement method |
| JP6250241B1 (en) * | 2016-04-08 | 2017-12-20 | 三菱電機株式会社 | Rotating electric machine wedge impact device and rotating electric machine wedge inspection system |
| US11353377B2 (en) * | 2017-01-23 | 2022-06-07 | Mitsubishi Electric Corporation | Wedge looseness inspection device of rotary electric machine |
| CN107246937B (en) * | 2017-07-31 | 2020-05-05 | 上海联影医疗科技有限公司 | CT (computed tomography) rack unbalance fault diagnosis method and CT equipment |
| CN107421730A (en) * | 2017-08-30 | 2017-12-01 | 中广核核电运营有限公司 | Intelligent robot and its method for testing slot wedge elasticity |
| CN107543677B (en) * | 2017-10-20 | 2019-03-12 | 广州大冷王测控设备有限公司 | It is a kind of for carrying out the impact test case of shaking test |
| CN109374041A (en) * | 2018-11-29 | 2019-02-22 | 三集团有限公司北京分公司 | Generator magnetic slot-seal detection system and method |
| CN111122135B (en) * | 2019-12-05 | 2021-05-28 | 西安交通大学 | Method for evaluating looseness degree of flange bolt connection structure |
-
2002
- 2002-10-22 CN CNB021394806A patent/CN1166934C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1403793A (en) | 2003-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100523765C (en) | Vibrating detection method for detecting looseness of large-scale generator rotor slot wedge and apparatus therefor | |
| CN1166934C (en) | Detection method of loosening slot wedge of rotating motor | |
| US8219361B2 (en) | Vibration analysis | |
| CN201945429U (en) | Device for analyzing vibration characteristic of wind turbine blade | |
| US11327054B2 (en) | System for determining excitation frequency of vibratory stress relief and method therefor | |
| US20060000281A1 (en) | Method and apparatus for assessing or predicting characteristics of wood or other wooden materials | |
| CN104050147B (en) | Time-domain signal is converted into into the method and system of frequency-region signal | |
| CN1865886A (en) | Spectral analysis peak-determination method for vibration aging | |
| CN105547619A (en) | Method and system for testing high-order modal frequency and high-order modal damping of thin wall member | |
| CN1808113A (en) | Method for detecting inner defect of roller using ultrasonic wave | |
| CN104314801A (en) | Test system of propulsive water-jet pump based on echoic environment and test method thereof | |
| CN1402015A (en) | Method and device for diagnosis of insulation ageing of electric machine based on small wave conversion | |
| CN1204410C (en) | Ultrasonic reflection detecting device and mehtod for diagnosis of insulation state of stator for large electric generator | |
| CN107764896B (en) | Testing device and method for testing soil wave velocity of centrifugal machine model by piezoelectric element array | |
| CN106596025A (en) | Highway tunnel hanging fan base stability detection method and system based on impulse response | |
| CN217845392U (en) | Shock wave acoustic field measurement system | |
| CN102346171A (en) | Flaw detecting system and method | |
| CN114924157A (en) | Parallel reactor state monitoring method and system based on 5G transmission | |
| RU56620U1 (en) | DEVICE FOR FORECASTING RESIDUAL RESOURCE AND PHYSICAL AND MECHANICAL PARAMETERS OF MATERIALS UNDER NON-DESTRUCTIVE CONTROL | |
| CN115288950A (en) | Wind power fan monitoring method, device and system and computer readable storage medium | |
| CN101691632B (en) | Method for rapidly judging peak | |
| JP2010249637A (en) | Method for detecting state of fluid and state detecting device | |
| CN201438134U (en) | Vibration aging system capable of judging peak rapidly | |
| CN1854705A (en) | Method and device for inspecting refrigeration system fault of air conditioner by ripple conversion | |
| CN114113951B (en) | Ultrasonic stress detection system and method for insulation defect of high-voltage switch cabinet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |