CN201021934Y - Online detector for initial failure of asynchronous electromotor - Google Patents
Online detector for initial failure of asynchronous electromotor Download PDFInfo
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- CN201021934Y CN201021934Y CNU2007201008773U CN200720100877U CN201021934Y CN 201021934 Y CN201021934 Y CN 201021934Y CN U2007201008773 U CNU2007201008773 U CN U2007201008773U CN 200720100877 U CN200720100877 U CN 200720100877U CN 201021934 Y CN201021934 Y CN 201021934Y
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- asynchronous motor
- acquisition card
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Abstract
Disclosed is an on-line detecting device for the incipient failures of an asynchronous motor, which belongs to the technical field of detection and is used to solve the problem of detecting the incipient failures of the asynchronous motor. The technical scheme of the utility model is that the utility model comprises three current transformers, three voltage transformers, a signal acquisition card and a computer, wherein the three current transformers are respectively connected with the three phase wires of the stator winding of the asynchronous motor, the output ends of the current transformers are respectively connected with the pin 5, the pin 6 and the pin 7 of the analog signal input channel of the signal acquisition card, the three voltage transformers are respectively connected with the three phase wires of the stator winding of the asynchronous motor, the output ends of the voltage transformers are respectively connected with the pin 1, the pin 2 and the pin 3 of the analog signal input channel of the signal acquisition card, and the output interface of the signal acquisition card is connected with the USB interface of the computer. The utility model not only can realize high-accuracy and high-reliability on-line detection of various incipient failures of the asynchronous motor but also is simple in structure and quite convenient to operate.
Description
Technical field
The utility model relates to that a kind of online detection asynchronous motor is just sent out, the device of initial failure, belongs to the detection technique field.
Background technology
As machine power, asynchronous motor is widely used in commercial production and national defence field, and its safe operation is most important.Asynchronous motor On-line Fault Detection (the particularly online detection of incipient failure) is one of key measure that ensures the asynchronous motor safe operation.The asynchronous motor fault mainly comprises stator winding inter-turn short circuit, rotor broken bar and bearing fault, and probability of happening is about 15%, 10%, 40% respectively.Above-mentioned fault all is progressive development, and just a stage can in time detect the committed step that prevents that beyond doubt serious accident from further developing at it.But also be not specifically designed to the device that detects various asynchronous motor incipient failures at present, in the time of need detecting motor, generally need draw up a plan for temporarily, prepare used instrument or device, layout circuit, detect then, operate very loaded down with trivial details.If design a kind of pick-up unit, can just send out the stage at motor fault and can make things convenient for, realize reliably online detection, for rationally arranging and organizing maintenance, avoiding force outage, have crucial meaning undoubtedly.
Summary of the invention
The purpose of this utility model be to provide a kind of simple in structure, easy to operate, can high sensitivity, the online detection asynchronous motor in high reliability ground just sends out, the asynchronous motor incipient failure on-line detector of initial failure.
The alleged problem of the utility model realizes with following technical proposals:
A kind of asynchronous motor incipient failure on-line detector, by current transformer, voltage transformer (VT), data acquisition card 1 and computing machine 2 are formed, described current transformer is provided with three, be respectively the first current transformer CT1, the second current transformer CT2 and the 3rd current transformer CT3, they are connected to respectively on three phase lines of asynchronous motor stator winding, their output terminal connects the simulating signal input channel 5 (5 of data acquisition card 1 respectively, 17 ends), 6 (6,17 ends), 7 (7,17 ends), described voltage transformer (VT) is provided with three, it is respectively first voltage transformer pt 1, second voltage transformer pt 2 and tertiary voltage mutual inductor PT3, they are connected to respectively on three phase lines of asynchronous motor stator winding, their output terminal connects the simulating signal input channel 1 (1 of data acquisition card 1 respectively, 17 ends), 2 (2,17 ends), 3 (3,17 ends), the output interface of described data acquisition card 1 (being 4 pin terminal row JP) connects the USB interface of computing machine 2.
The utility model utilizes current transformer online acquisition motor stator currents momentary signal, utilize voltage transformer (VT) online acquisition motor stator voltage momentary signal, data acquisition card is sent to computing machine with stator current, voltage signal after collecting, computing machine carries out analytical calculation to signal, judge that whether motor exists fault, exports judged result at last.The utility model not only can high sensitivity, the online detection asynchronous motor in high reliability ground is variously just sent out, initial failure, and simple in structure, easy to operate, thereby can effectively ensure the safe operation of asynchronous motor.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is an electrical schematic diagram of the present utility model.
Each label is among the figure: 1, data acquisition card; 2, computing machine; 3, mouse; 4, voltage tester folder; 5, testing current pincers; CT1, CT2, CT3, current transformer; PT1, PT2, PT3, voltage transformer (VT).
Embodiment
Among Fig. 1, computing machine 2 adopts pocket computer, the optional DELL M1210 of model, and data acquisition card 1 adopts auspicious rich magnificent RBH8321 type capture card, data acquisition card 1 external 3 dolphin voltage testers folder and 3 testing current pincers, they are signal input parts of data acquisition card 1.The voltage tester folder is divided into Huang, green, red trichromatism, difference corresponding A, B, C three-phase, and the testing current pincers also are divided into Huang, green, red trichromatism, respectively corresponding A, B, C three-phase.
When motor is detected, for high-voltage motor, adopt 3 voltage testers to be clipped in voltage transformer (VT) (PT1, PT2, PT3) secondary side and measure threephase stator voltage momentary signal, adopt 3 testing current pincers to measure threephase stator electric current momentary signal at current transformer (CT1, CT2, CT3) secondary side.For low voltage motor, adopt 3 voltage tester folders directly to measure threephase stator voltage momentary signal at the connecting terminal of motor place, adopt 3 testing current pincers directly to measure threephase stator electric current momentary signal at the connecting terminal of motor place.Connect motor for Y, can only adopt 2 testing current pincers to measure two-phase stator current momentary signal, third phase stator current momentary signal calculates according to " threephase stator current instantaneous value sum perseverance is 0 " to be determined.
Threephase stator voltage, three-phase (or two-phase, Y connects) stator current momentary signal is submitted to data acquisition card 1 after the amplitude conditioning, data acquisition card 1 is connected in portable computer 2 by USB interface.Portable computer 2 control signal capture cards 1 are with appropriate frequency sampling stator voltage, stator current momentary signal, and are stored in hard disk.
When whether the detection motor exists stator winding inter-turn short circuit failure, computing machine 2 is according to threephase stator voltage, three-phase (or the two-phase of gathering, Y connects) the stator current momentary signal, calculate stator negative sequence voltage, stator negative-sequence current, stator positive sequence voltage, stator forward-order current.If do not set up normal motor sample reference paper as yet, then stator negative-sequence current detection threshold is set according to routine, judge whether to exist stator winding inter-turn short circuit failure.If set up normal motor sample reference paper, then adopt curve fitting technique to estimate the stator negative phase-sequence apparent impedance filter value that normal motor is embodied under this running status according to stator positive sequence voltage, stator forward-order current, and calculating stator negative-sequence current fault component, then from adjusting stator negative-sequence current fault component detection threshold, judge whether to exist stator winding inter-turn short circuit failure at last.
When whether the detection motor exists rotor bar breaking fault or bearing fault, one phase stator current signal of 2 pairs of collections of computing machine is done continuous refinement Fourier transform, determine the frequency of its fundametal compoment, amplitude and initial phase angle, form reference signal in view of the above, according to the frequency and the reference signal of fundametal compoment stator current signal is done auto adapted filtering then, offset its fundametal compoment, then signal is done continuous refinement Fourier transform, analyze stator current teeth groove harmonic component to estimate motor slip ratio, last frequency according to fundametal compoment, motor slip ratio, in the continuous refinement spectrogram of signal, inquire about fault characteristic information, judge whether to exist fault.The utility model can also be set up the sample reference paper to the different running statuses of normal motor, with further raising fault detect sensitivity and reliability.
Adopt the utility model to measure motor stator voltage, stator current signal and operation troubles trace routine, the utility model points out, guides the user to set up motor sample reference paper simply, easily automatically.In case set up motor sample reference paper, asynchronous motor incipient failure on-line detector can carry out fault detect sensitive more, reliably.
The utility model adopts stator negative phase-sequence apparent impedance filter value and stator IMPEDANCE ANGLE SEPARATION as the stator winding inter-turn short circuit failure feature, in conjunction with sample learning and detection threshold automatic-adjusting technique, can high sensitivity, the first stator winding inter-turn short circuit failure of the property sent out of the online detection asynchronous motor in high reliability ground.The utility model with continuous refinement Fourier transform, auto adapted filtering, rotor tooth slot harmonic revolutional slip estimate, the detection threshold automatic-adjusting technique organically combines, can high sensitivity, the online detection asynchronous motor in high reliability the ground just rotor bar breaking fault and the bearing fault of the property sent out.
Claims (1)
1. asynchronous motor incipient failure on-line detector, it is characterized in that, it is by current transformer, voltage transformer (VT), data acquisition card (1) and computing machine (2) are formed, described current transformer is provided with three, be respectively first current transformer (CT1), second current transformer (CT2) and the 3rd current transformer (CT3), they are connected to respectively on three phase lines of asynchronous motor stator winding, their output terminal connects simulating signal input channel 5 ends and 17 ends of data acquisition card (1) respectively, 6 ends and 17 ends, 7 ends and 17 ends, described voltage transformer (VT) is provided with three, be respectively first voltage transformer (VT) (PT1), second voltage transformer (VT) (PT2) and tertiary voltage mutual inductor (PT3), they are connected to respectively on three phase lines of asynchronous motor stator winding, their output terminal connects simulating signal input channel 1 end and 17 ends of data acquisition card (1) respectively, 2 ends and 17 ends, 3 ends and 17 ends, the output interface of described data acquisition card (1) connects the USB interface of computing machine (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201008773U CN201021934Y (en) | 2007-03-28 | 2007-03-28 | Online detector for initial failure of asynchronous electromotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201008773U CN201021934Y (en) | 2007-03-28 | 2007-03-28 | Online detector for initial failure of asynchronous electromotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201021934Y true CN201021934Y (en) | 2008-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201008773U Expired - Fee Related CN201021934Y (en) | 2007-03-28 | 2007-03-28 | Online detector for initial failure of asynchronous electromotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201021934Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102135600A (en) * | 2011-01-28 | 2011-07-27 | 中国人民解放军海军潜艇学院 | Fault detection device and method of asynchronous motor |
| CN102508158A (en) * | 2011-11-08 | 2012-06-20 | 华北电力大学（保定） | System for detecting incipient failure of asynchronous motor cluster |
| CN105891660A (en) * | 2016-06-17 | 2016-08-24 | 华北电力大学（保定） | Method for detecting turn-to-turn short circuit fault of stator winding of generator |
| CN113625117A (en) * | 2021-08-17 | 2021-11-09 | 河北工业大学 | Motor stator turn-to-turn short circuit fault diagnosis method, device and system |
-
2007
- 2007-03-28 CN CNU2007201008773U patent/CN201021934Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102135600A (en) * | 2011-01-28 | 2011-07-27 | 中国人民解放军海军潜艇学院 | Fault detection device and method of asynchronous motor |
| CN102508158A (en) * | 2011-11-08 | 2012-06-20 | 华北电力大学（保定） | System for detecting incipient failure of asynchronous motor cluster |
| CN105891660A (en) * | 2016-06-17 | 2016-08-24 | 华北电力大学（保定） | Method for detecting turn-to-turn short circuit fault of stator winding of generator |
| CN105891660B (en) * | 2016-06-17 | 2019-03-29 | 华北电力大学（保定） | A kind of detection method of generator unit stator winding interturn short-circuit failure |
| CN113625117A (en) * | 2021-08-17 | 2021-11-09 | 河北工业大学 | Motor stator turn-to-turn short circuit fault diagnosis method, device and system |
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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: 20080213 Termination date: 20120328 |