CN1099481A - Method and device for monitering rotor break-rod of cage asynchronous motor - Google Patents
Method and device for monitering rotor break-rod of cage asynchronous motor Download PDFInfo
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- CN1099481A CN1099481A CN 93116609 CN93116609A CN1099481A CN 1099481 A CN1099481 A CN 1099481A CN 93116609 CN93116609 CN 93116609 CN 93116609 A CN93116609 A CN 93116609A CN 1099481 A CN1099481 A CN 1099481A
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- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 238000001228 spectrum Methods 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 4
- 238000012806 monitoring device Methods 0.000 claims description 8
- 238000010183 spectrum analysis Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims 1
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Abstract
The method for monitoring broken bar in squirrel-cage asynchronous motor rotors features that the current signals in stator winding during starting is sampled and preprocessed and the processed signals are timely and spectrally analyzed by special software to obtain the frequency spectrum of the stator current, from which the characteristic component (1-2g)f1 in it, which varies with time, is indicated for judgement of broken rotor bar with high sensitivity.
Description
The present invention-mouse cage asynchronous motor rotor broken bar monitoring method and monitoring device thereof relate to motor monitoring field.
The mouse cage asynchronous motor rotor broken bar is a kind of most common failure of this type of motor, in case disconnected bar takes place, influence runs well.How to utilize the non-intruding mode to monitor, use what device to carry out non-intruding monitor, be the problem that this asynchronous motor use department is concerned about always.Up to now, carry out this class monitoring, mostly adopt split core type current transformer to measure the stator winding electric current, and, steady-state current is done spectrum analysis, according to having or not (1-2s) f in the frequency spectrum with FFT quick (fast Fourier transformation) after computing machine is sent in the A/D sampling
1(s is the slippage of motor in service to the component of frequency herein, f
1Be mains frequency) determine that rotor has or not disconnected bar, there is this component to represent that then cage rotor bar occurs resolving and do not have this component and then represent not have disconnected bar, be normal.
Comprise split core type current transformer, adapter, A/D(analog-digital converter with this method monitoring device that has adopted that adapts), the PC(microcomputer) form.
There are following weak point in above-mentioned existing monitoring method and device thereof: 1. require the motor must be with going up certain load, as resolute bar number less (as only 1,2), then require load bigger, and, electric current is being carried out require the fluctuation of load less in the sampling process.2. because asynchronous motor, particularly slippage is very little during the large-sized asynchronous motor operation, is everlasting about 0.01, so (1-2s) f
1Frequency and f
1Frequency is very approaching, and the influence that spectrum analysis is leaked owing to window function, (1-2s) f on the spectrogram
1The branch measure feature of the disconnected bar of frequency is too little, easily causes erroneous judgement.3. when there was disconnected bar on the double-cage rotor upper strata, it was very low to detect disconnected bar sensitivity from steady-state current.
The objective of the invention is to, weak point at above-mentioned existing monitoring method and device thereof, a kind of mouse cage asynchronous motor rotor broken bar monitoring method and monitoring device thereof are provided, the steady-state current spectrum analysis of comparing, bar monitoring sensitivity and the accuracy of breaking is improved, and do not receive non-loaded influence.
In order to realize the foregoing invention purpose, the mouse cage asynchronous motor rotor broken bar monitoring method that provides among the present invention comprises the following steps:
1. use current sensor that stator winding electric current in the tested asynchronous motor starting process is sent into wide thresholding data acquisition and preprocessor through split core type current transformer, current signal is given handling making it be transformed to digital signal to send into computing machine;
2. with special software the digital signal of this asynchronous motor stator electric current is carried out Time-frequency Spectrum Analysis by computing machine, obtain the three-dimensional time-frequency spectrum of stator current in the asynchronous motor starting process, in order to show mobile characteristic component (1-2s) f of variation in time in the stator current
1
3. according to having or not mobile characteristic component (1-2s) f on the three-dimensional time-frequency spectrum
1Judge that this asynchronous motor rotor has or not disconnected bar;
Enforcement for said method, the asynchronous motor rotor strip-broken monitoring device that provides among the present invention, comprise computing machine and output display part, pincerlike current sensor, it is characterized in that this device also is provided with to gather and give handles the wide codomain data acquisition of asynchronous motor starting electric current and pretreater and carries out the software of Time-frequency Spectrum Analysis to giving the signal of handling, above-mentioned wide codomain data acquisition and preprocessor comprise attenuator circuit, low-pass filter circuit successively, sampling hold circuit, high-precision A/D change-over circuit, interface circuit for data transmission.
Utilize mouse cage asynchronous motor rotor broken bar monitoring method provided by the invention and monitoring device thereof, because signal is taken from starting state, improve the sensitivity of resolving the bar diagnosis greatly, reliability, thereby can find the rotor bar breaking fault of this type of motor immediately, realize the precognition maintenance, avoided can only treating in the past that the rotor broken bar number increases after, it is unexpected that left alone without help machine influence the accident of whole production line operation, so also helps overcoming by disconnected bar scratch stator causing the bigger damage of motor.
Accompanying drawing and simple declaration thereof
Accompanying drawing 1 is the formation block diagram of mouse cage asynchronous motor rotor broken bar monitoring device
Fig. 2 is the circuit diagram of used wide codomain data acquisition and pretreater among the embodiment
Fig. 3 is the FB(flow block) of mouse cage asynchronous motor rotor broken bar monitoring method
Fig. 4 software logic block diagram
The stable state frequency spectrum of stator current when Fig. 5 (a) mouse cage asynchronous motor rotor does not have disconnected bar.The stable state frequency spectrum of stator current when (b) the mouse cage asynchronous motor rotor has disconnected bar.
When Fig. 6 (a) does not have disconnected bar for the mouse cage asynchronous motor rotor, the time-frequency spectrum of starting process stator current; (b) be rotor have disconnected bar (with Fig. 5 (b) be same motor) time-frequency spectrum of motor starting procedure.
Embodiment: in the present embodiment as the normal split core type current transformer of mouse cage asynchronous motor rotor broken bar monitoring method device gating as current sensor, by sensor, the current signal that obtains is sent into the second order active low-pass filter, end frequency its year is 60 hertz, current signal is carried out pre-service, by AD574(J) etc. constitute the collector of wide codomain, utilize software to carry out Time-frequency Spectrum Analysis by 286 portable PCs, that use is short time discrete Fourier transform (STFT) gained result such as accompanying drawing 6(a), (b).Shown in, in order to judge that cage rotor has or not disconnected bar, obvious difference is arranged on the time-frequency spectrum.
Claims (3)
1, a kind of mouse cage asynchronous motor rotor broken bar monitoring method is characterized in that this method is made of the following step:
1. use current sensor that stator winding electric current in the tested asynchronous motor starting process is sent into wide thresholding data acquisition and preprocessor through split core type current transformer, current signal is given handling making it be transformed to digital signal to send into computing machine;
2. with special software the digital signal of this asynchronous motor stator electric current is carried out Time-frequency Spectrum Analysis by computing machine, obtain the three-dimensional time-frequency spectrum of stator current in the asynchronous motor starting process, in order to show mobile characteristic component (1-2s) f of variation in time in the stator current
1
3. according to having or not mobile characteristic component (1-2s) f on the three-dimensional time-frequency spectrum
1Judge that this asynchronous motor rotor has or not disconnected bar;
2, a kind of mouse cage asynchronous motor rotor broken bar monitoring device comprises computing machine output display part and pincerlike current sensor, it is characterized in that this device also has the wide codomain data acquisition and the pretreater of collection and the moving starting current of pre-service asynchronous machine, and the software that above-mentioned pretreated starting current data is carried out Time-frequency Spectrum Analysis by the aforementioned calculation machine;
3, the mouse cage asynchronous motor rotor broken bar monitoring device of putting down in writing according to claim 1, it is characterized in that, said wide codomain data acquisition and pretreater comprise attenuator circuit successively, the low energy filtering circuit, sampling hold circuit, high-precision A/D change-over circuit (containing interface circuit for data transmission).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93116609A CN1039260C (en) | 1993-08-27 | 1993-08-27 | Method and device for monitering rotor break-rod of cage asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93116609A CN1039260C (en) | 1993-08-27 | 1993-08-27 | Method and device for monitering rotor break-rod of cage asynchronous motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1099481A true CN1099481A (en) | 1995-03-01 |
| CN1039260C CN1039260C (en) | 1998-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93116609A Expired - Fee Related CN1039260C (en) | 1993-08-27 | 1993-08-27 | Method and device for monitering rotor break-rod of cage asynchronous motor |
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| CN (1) | CN1039260C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0961130A1 (en) * | 1998-05-28 | 1999-12-01 | DaimlerChrysler AG | Method and apparatus for early detection of faulty rotors in asynchronous machines |
| CN102279343A (en) * | 2011-07-23 | 2011-12-14 | 华北电力大学（保定） | Online detection method of broken rotor bar fault of cage-type asynchronous motor based on ESPRIT-SAA |
| CN102279364A (en) * | 2011-07-23 | 2011-12-14 | 华北电力大学（保定） | Method for detecting broken bar fault of cage type asynchronous motor rotor based on multiple signal classification (MUSIC) and pattern search algorithm (PSA) |
| CN102495368A (en) * | 2011-12-16 | 2012-06-13 | 西南大学 | Non-invasive online detection method and system for rotor broken-bar fault of three-phase cage type asynchronous motor |
| CN102944842A (en) * | 2012-11-30 | 2013-02-27 | 华北电力大学（保定） | Detecting method for rotor broken bar fault of cage-type asynchronous motor |
| CN104101833A (en) * | 2013-04-08 | 2014-10-15 | 通用电气能源能量变换技术有限公司 | Broken rotor bar detection based on current signature analysis of an electric machine |
| CN104765003A (en) * | 2015-02-11 | 2015-07-08 | 湘潭大学 | Asynchronous motor rotor bar break fault diagnosis method for engineering machine internet of things |
| CN104777396A (en) * | 2015-03-12 | 2015-07-15 | 浙江大学 | Rotor fault diagnosis method giving comprehensive consideration to current and voltage of motor |
| CN106597277A (en) * | 2016-11-21 | 2017-04-26 | 河南理工大学 | Variable-frequency speed-regulation cage asynchronous motor rotor broken bar fault dynamic diagnosis method and device |
| CN110082676A (en) * | 2019-04-03 | 2019-08-02 | 中南大学 | A kind of squirrel-cage asynchronous motor rotor broken bar fault modeling method and fault injector |
| RU2724988C1 (en) * | 2019-07-09 | 2020-06-29 | федеральное государственное бюджетное образовательное учреждение высшего образования "Ивановский государственный энергетический университет имени В.И. Ленина" (ИГЭУ) | Method of detecting broken rods in short-circuited winding of asynchronous motor rotor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1339462A1 (en) * | 1985-07-10 | 1987-09-23 | В.А.Фокин и О.В.Фокин | Device for checking the windings |
| CN1056002C (en) * | 1994-03-08 | 2000-08-30 | 李大顺 | Detection apparatus for cast-aluminium rotor of electric machine |
-
1993
- 1993-08-27 CN CN93116609A patent/CN1039260C/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0961130A1 (en) * | 1998-05-28 | 1999-12-01 | DaimlerChrysler AG | Method and apparatus for early detection of faulty rotors in asynchronous machines |
| CN102279343B (en) * | 2011-07-23 | 2013-08-07 | 华北电力大学（保定） | Online detection method of broken rotor bar fault of cage-type asynchronous motor based on ESPRIT-SAA |
| CN102279343A (en) * | 2011-07-23 | 2011-12-14 | 华北电力大学（保定） | Online detection method of broken rotor bar fault of cage-type asynchronous motor based on ESPRIT-SAA |
| CN102279364A (en) * | 2011-07-23 | 2011-12-14 | 华北电力大学（保定） | Method for detecting broken bar fault of cage type asynchronous motor rotor based on multiple signal classification (MUSIC) and pattern search algorithm (PSA) |
| CN102495368A (en) * | 2011-12-16 | 2012-06-13 | 西南大学 | Non-invasive online detection method and system for rotor broken-bar fault of three-phase cage type asynchronous motor |
| CN102944842B (en) * | 2012-11-30 | 2015-11-18 | 华北电力大学（保定） | A kind of cage type asynchronous motor rotor strip-broken failure detecting method |
| CN102944842A (en) * | 2012-11-30 | 2013-02-27 | 华北电力大学（保定） | Detecting method for rotor broken bar fault of cage-type asynchronous motor |
| CN104101833A (en) * | 2013-04-08 | 2014-10-15 | 通用电气能源能量变换技术有限公司 | Broken rotor bar detection based on current signature analysis of an electric machine |
| CN104765003A (en) * | 2015-02-11 | 2015-07-08 | 湘潭大学 | Asynchronous motor rotor bar break fault diagnosis method for engineering machine internet of things |
| CN104777396A (en) * | 2015-03-12 | 2015-07-15 | 浙江大学 | Rotor fault diagnosis method giving comprehensive consideration to current and voltage of motor |
| CN104777396B (en) * | 2015-03-12 | 2017-05-17 | 浙江大学 | Rotor fault diagnosis method giving comprehensive consideration to current and voltage of motor |
| CN106597277A (en) * | 2016-11-21 | 2017-04-26 | 河南理工大学 | Variable-frequency speed-regulation cage asynchronous motor rotor broken bar fault dynamic diagnosis method and device |
| CN106597277B (en) * | 2016-11-21 | 2019-03-15 | 河南理工大学 | Frequency control Rotor Bars Breaking Fault in Squirrel-cage Asynchronous Motors dynamic diagnosis method and device |
| CN110082676A (en) * | 2019-04-03 | 2019-08-02 | 中南大学 | A kind of squirrel-cage asynchronous motor rotor broken bar fault modeling method and fault injector |
| RU2724988C1 (en) * | 2019-07-09 | 2020-06-29 | федеральное государственное бюджетное образовательное учреждение высшего образования "Ивановский государственный энергетический университет имени В.И. Ленина" (ИГЭУ) | Method of detecting broken rods in short-circuited winding of asynchronous motor rotor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1039260C (en) | 1998-07-22 |
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