CN202305759U - Motor fault monitoring device capable of resisting interference - Google Patents
Motor fault monitoring device capable of resisting interference Download PDFInfo
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- CN202305759U CN202305759U CN2011203480229U CN201120348022U CN202305759U CN 202305759 U CN202305759 U CN 202305759U CN 2011203480229 U CN2011203480229 U CN 2011203480229U CN 201120348022 U CN201120348022 U CN 201120348022U CN 202305759 U CN202305759 U CN 202305759U
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- current transformer
- fault monitoring
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Abstract
A motor fault monitoring device capable of resisting interference belongs to the technical field of checkout equipment, and is used for removing and reducing interference on a motor during fault monitoring. The technical scheme is that the motor fault monitoring device comprises a current transformer, a measuring circuit, an analog to digital (A/D) change-over circuit, a computer and a display communication circuit. The current transformer is installed on a stator winding on an induction motor, the current transformer is composed of a first winding, a secondary winding, an iron core and a shielding layer, the secondary winding, the shielding layer and the first winding are wound on the iron core in sequence sequentially, the first winding is connected with a stator of the induction motor in series, the secondary winding is shielded by the shielding layer and connected with the ground, and the secondary winding is connected with the measuring circuit. Through shielding between the first winding and the secondary winding of the mutual inductor, the interference can effectively reduced, measurement accuracy of stator current signals is improved, under the condition that a transducer supplies power, correct rate of fault diagnosis reaches 98%, the circuit structure is simple, work is reliable, debugging is convenient and the motor fault monitoring device is easy to produce.
Description
Technical field
The utility model relates to and a kind of motor fault is carried out device for monitoring, belongs to the checkout equipment technical field.
Background technology
Owing to receive influence of various factors such as site environment, operating condition and workmanship, can cause faults such as stator winding short circuit, rotor bearing damage, the fracture of cage bar during the induction motor operation, wherein rotor fault occupies sizable ratio.The conventional method of diagnosing of motor fault has multiple; Fairly simple method is to utilize people's sense organ through the height of equipment operation sound, the size of temperature, the power of vibration, the signs such as the depth of color are found fault and position thereof; Be to measure the trouble spot with the fault detect test unit more accurately, commonly used have Insulation Test system, charging temps meter, earth test system, ultrasonic wave detecting system and a new pattern creepage reometer etc.
In the said method; Though sense organ diagnosis small investment wants fault to acquire a certain degree, thereby poor reliability; And use instrument current signal monitoring, vibration signal monitoring, insulation diagnosis and temperature detection etc. to be arranged to the monitoring means of induction motor fault, concrete grammar is following:
1) amperometry: thus through signal analysis methods such as spectrum analyses the waveform of load current is detected reason and the degree of diagnosing out the motor device fault;
2) insulation diagnosis method: utilize various electrical test systems and diagnostic techniques whether to exist defective to make judgement, and the insulation residual life is made prediction to insulation system, the serviceability of equipment;
3) temperature detection method: adopt all temps measuring method that the temperature rise at each position of motor device is kept watch on.The temperature rise of motor is relevant with the various faults phenomenon of motor;
4) the audio clinic method of shaking: through the sound detection of shaking, and signal carried out analyzing and processing to motor device, reason and the position of diagnosing out motor to produce fault, especially effective especially to damage diagnosis mechanically.
In said method, can make non-intrusion type because of current monitoring method and obtain using the most widely.Under the power frequency supply electric power thus supplied; Based on the motor stator currents signal; Utilize signal analysis technologies such as fast Fourier transform (FFT) method, wavelet analysis method, adaptive method, can effectively carry out rotor bar breaking fault feature extraction and on-line monitoring, this respect has many achievements in research.Yet for the monitoring of induction motor fault current under the inverter supply situation, research also seldom.
In recent years; Variable-frequency control technique with its high efficiency, performance is good and be widely used in each control fields such as industrial and agricultural production and science and techniques of defence; Frequency converter is as the application of power supply system; Improved the operation speed adjusting performance of cage induction motor; But the AC motor that adopts the PWM frequency converter to drive also can produce some negative effects, comprises that the increase of the superpotential of winding and the inhomogeneous stator winding insulation accident that causes that turn-to-turn voltage distributes, the increase of shaft current cause that the common shake of the damage of bearing, harmonic wave moment cage rotor causes the increase of the disconnected bar of cage rotor and the increase of interference etc.In addition, frequency converter can be to producing very strong electromagnetic noise interference in when operation around it, seriously influences thereby bring for the measurement of signal.Therefore, how eliminating and reduce the disturbing effect that inverter supply produces is the important measures that improve motor fault monitoring accuracy.
The utility model content
The utility model technical matters to be solved is to measure complicacy and the singularity shown to inverter supply induction motor stator current signal, provide a kind of can eliminate electromagnetic interference signal, the precision that improves the induction motor fault diagnosis and accuracy effectively can jamproof motor fault monitoring device.
The technical scheme that solves the problems of the technologies described above is:
A kind of can jamproof motor fault monitoring device, it comprises current transformer, metering circuit, A/D change-over circuit, computing machine, display communication circuit, current transformer, metering circuit, A/D change-over circuit; Computing machine, the display communication circuit is electrically connected, and its improvements are; Current transformer is installed on the stator winding of induction motor; Current transformer is made up of winding, Secondary Winding, iron core and a screen layer, and Secondary Winding, screen layer, order is on iron core successively for a winding, and one time winding is connected with the induction electric machine stator; Secondary Winding is by screen layer shielding and ground connection, and Secondary Winding is connected with metering circuit.
Above-mentioned can jamproof motor fault monitoring device, the sample resistance of said metering circuit is connected in the Secondary Winding.
The usefulness of the utility model is:
Induction motor speed-adjusting and control system for inverter supply; The electromagnetic interference (EMI) that is produced by frequency converter mainly shows measurement mutual inductor capacitance coupling effect; The utility model passes through the shielding between mutual inductor first and second winding; Can reduce interference effectively, improve the measuring accuracy of stator current signal, this method is very effective through the engineering experiment testing authentication.Under the inverter supply situation, utilize the induction motor stator current signal to carry out the online detection and the diagnosis of fault simultaneously, the fault diagnosis accuracy has reached 98%.Sort circuit is simple in structure, reliable operation, and debugging is convenient, is easy to realize.
Description of drawings
Fig. 1 is the theory diagram of the utility model;
Fig. 2 is that the current transformer of the utility model connects synoptic diagram.
Mark is following among the figure: three-phase alternating-current supply 1, frequency converter 2, induction motor 3, current transformer 4, metering circuit 5, A/D change-over circuit 6, computing machine 7, display 8, operation keyboard 9, data storage 10,11, windings 12 unshakable in one's determination, Secondary Winding 13, screen layer 14, winding connection end L1, winding connection end L2, Secondary Winding terminals K1, Secondary Winding terminals K2, sample resistance R.
Embodiment
Show among Fig. 1 that main circuit is made up of frequency converter 2 and induction motor 3, three-phase alternating-current supply 1 power supply.Pick-up unit comprises current transformer 4, metering circuit 5, A/D change-over circuit 6, computing machine 7, display 8, operation keyboard 9, data storage 10, and they are electrically connected.Stator current is required voltage signal through Secondary Winding 13 outputs of current transformer 4 through metering circuit 5, and presses certain SF by data collecting card, inputs to the on-line monitoring that computing machine 7 carries out real-time analysis, processing and the fault of data.
Fig. 2 shows that current transformer 4 is made up of 11, windings 12, Secondary Winding 13, screen layers 14 unshakable in one's determination.Secondary Winding 13, screen layer 14, order is on unshakable in one's determination 11 successively for a winding 12, and one time winding 12 connect with induction motor 3 stators, and Secondary Winding 13 shields also ground connection by screen layer 14, and Secondary Winding 13 is connected with metering circuit 5.
Usually, the induced voltage that capacitive coupling causes is proportional to interfering frequency, input resistance and coupling capacitance, disturbs in order to suppress capacitive coupling, and effective method is to reduce coupling capacitance.Secondary Winding 13 bondings of the current transformer 4 among the figure can reduce interference effectively, improve the measuring accuracy of stator current signal.
Fig. 2 shows that the terminals of a winding 12 of current transformer 4 are a winding connection end L1, a winding connection end L2, and the terminals of Secondary Winding 13 are Secondary Winding terminals K1, Secondary Winding terminals K2.A winding connection end L1, a winding connection end L2 connect with induction motor 3 stators, and the terminals of Secondary Winding 13 are that Secondary Winding terminals K1, Secondary Winding terminals K2 connect metering circuit 5, and the current ratio of current transformer 4 is 15/5.Through the sample resistance R in the metering circuit induction motor 3 stator current signals are measured the resistance of flowing through and become voltage signal, output terminal connects the A/D change-over circuit.
Claims (2)
- One kind can jamproof motor fault monitoring device; It comprises current transformer (4), metering circuit (5), A/D change-over circuit (6), computing machine (7), display communication circuit (8); Current transformer (4), metering circuit (5), A/D change-over circuit (6), computing machine (7), display communication circuit (8) are electrically connected; It is characterized in that: current transformer (4) is installed on the stator winding of induction motor (3); Current transformer (4) is made up of a winding (12), Secondary Winding (13), (11) unshakable in one's determination and screen layer (14); Secondary Winding (13), screen layer (14), a winding (12) are successively in proper order on (11) unshakable in one's determination; A winding (12) is connected with induction motor (3) stator, and Secondary Winding (13) is by screen layer (14) shielding and ground connection, and Secondary Winding (13) is connected with metering circuit (5).
- 2. according to claim 1 can jamproof motor fault monitoring device, it is characterized in that: the sample resistance R of said metering circuit (5) is connected in the Secondary Winding (13) of current transformer (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203480229U CN202305759U (en) | 2011-09-16 | 2011-09-16 | Motor fault monitoring device capable of resisting interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203480229U CN202305759U (en) | 2011-09-16 | 2011-09-16 | Motor fault monitoring device capable of resisting interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202305759U true CN202305759U (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203480229U Expired - Fee Related CN202305759U (en) | 2011-09-16 | 2011-09-16 | Motor fault monitoring device capable of resisting interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202305759U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108960339A (en) * | 2018-07-20 | 2018-12-07 | 吉林大学珠海学院 | A kind of electric car induction conductivity method for diagnosing faults based on width study |
-
2011
- 2011-09-16 CN CN2011203480229U patent/CN202305759U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108960339A (en) * | 2018-07-20 | 2018-12-07 | 吉林大学珠海学院 | A kind of electric car induction conductivity method for diagnosing faults based on width study |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20130916 |