CN1858612A - Detecting method and its detecting device for squirrel cage asynchronous motor rotor broken strip and thin strip - Google Patents
Detecting method and its detecting device for squirrel cage asynchronous motor rotor broken strip and thin strip Download PDFInfo
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- CN1858612A CN1858612A CN 200610051854 CN200610051854A CN1858612A CN 1858612 A CN1858612 A CN 1858612A CN 200610051854 CN200610051854 CN 200610051854 CN 200610051854 A CN200610051854 A CN 200610051854A CN 1858612 A CN1858612 A CN 1858612A
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- asynchronous motor
- motor rotor
- cage asynchronous
- rotor
- slice
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Abstract
This invention discloses a method for testing broken and thinned bars of a rotor of a cage asynchronous motor and a test device, which applies current signals on a die cast conductor of the rotor, detects the magnetic field strength of the circle surface of the rotor with a magnet-sensitive sensor and the signals of the sensor are amplified and filtered to get a distribution picture of the field strength of the circle surface of the rotor to decide if there are broken or thinned bars, or their number and positions of the rotor based on the distribution picture.
Description
Technical field
The present invention relates to motor detection method and device, relate in particular to a kind of squirrel-cage asynchronous motor rotor disconnected bar, slice detection method and pick-up unit.
Background technology
Squirrel-cage asynchronous motor rotor slice, disconnected bar are this type of motor recurrent problems in producing and using.Particularly in the production run of motor, because rotor slice, disconnected bar cause the product quality problem of motor, cause the very big wasting of resources and economic loss to production unit, also directly influence the product quality of downstream production firm.
The disconnected bar detection of squirrel-cage asynchronous motor rotor at present mainly is to realize by some characteristic tests to the motor complete machine, detects for the rotor slice and just is difficult to realization.So the rotor broken bar detection method has the following disadvantages at present: 1. can't before the motor assembling, whether disconnected bar and slice defective be arranged detection rotor; 2. can't determine the position of disconnected bar and slice defective; 3. detection sensitivity is low, and confidence level is poor; 4. detection method is complicated relatively, is difficult to adapt to produce in batches detect requirement.
Summary of the invention
The objective of the invention is at above-mentioned detection method and the existing deficiency of pick-up unit, provide a kind of at squirrel-cage asynchronous motor rotor disconnected bar, slice detection method and pick-up unit.
In order to reach the foregoing invention purpose, the technical solution used in the present invention is:
One. mouse cage asynchronous motor rotor broken bar, slice detection method:
1) on the die casting electric conductor of squirrel-cage asynchronous motor rotor, applies current signal;
2) survey squirrel-cage asynchronous motor rotor circumferential surface magnetic field intensity with magneto-dependent sensor, the magneto-dependent sensor signal obtains squirrel-cage asynchronous motor rotor circumferential surface magnetic field distribution figure through amplification, Filtering Processing;
3) judge that according to rotor circumference Surface field intensity distribution this asynchronous motor rotor has or not disconnected bar, slice and disconnected bar slice quantity and position.
Two. mouse cage asynchronous motor rotor broken bar, slice pick-up unit:
Comprise current signal source, magneto-dependent sensor, signal amplification circuit and filter circuit, detection signal real-time waveform display device; The current signal source is connected on the both ends of the surface die casting electric conductor of mouse cage asynchronous motor rotor, magneto-dependent sensor is at the circumferential surface near the mouse cage asynchronous motor rotor, detection signal along the circumferential direction connects detection signal real-time waveform display device through signal amplification circuit, filter circuit.
The present invention compares the beneficial effect that has with background technology: utilize the present invention to detect, highly sensitive, accurate positioning can be done quantitative test to each filler rod of motor rotor, and is easy to use.Can directly apply to the batch detection of motor automatic assembly line, adapt to produce in batches and detect requirement.
Description of drawings
Fig. 1 is a detection theory diagram of the present invention;
Fig. 2 is a detection basic circuit diagram of the present invention.
Fig. 3 is the actual detected display waveform drafting figure of pick-up unit of the present invention.
Embodiment
As shown in Figure 1, the present invention includes current signal source, magneto-dependent sensor, signal amplification circuit and filter circuit and real-time waveform display device; The current signal source is connected on the both ends of the surface die casting electric conductor of mouse cage asynchronous motor rotor, magneto-dependent sensor is near the circumferential surface of mouse cage asynchronous motor rotor, sensor along the circumferential direction detects magnetic field intensity signal through amplifying circuit, filter circuit, feeble signal is handled output, show directly that by display device the magnetic field intensity signal waveform is for interpretation.
As shown in Figure 2, provide ac current signal to be applied to mouse cage asynchronous motor motor rotor die-casting electric conductor biend by step-down transformer L1.
Select for use the HZ3503 Hall element along the circumferential direction to survey rotor circumference Surface field intensity.Three amplifying circuits that the electric signal of HZ3503 Hall element output is made up of resistance R 1, R2, R3, capacitor C 1, operational amplifier A 1 and resistance R 5, R6, R7, capacitor C 4, operational amplifier A 2 and resistance R 9, R10, R11, capacitor C 7, operational amplifier A 3 respectively are coupled into three grades of signal amplifiers through capacitor C 2, C5 and amplify, two filter filterings by resistance R 4, capacitor C 3 and resistance R 8, capacitor C 6 are formed output to oscillograph through capacitor C 8 and show motor rotor circumferential surface magnetic field intensity signal.Observe rotor circumference Surface field intensity distributions (as shown in Figure 3) by oscillograph, judge according to corresponding magnetic field, rotor filler rod position is strong and weak whether tested motor rotor has disconnected bar, slice defective.1,2,5,6,8,9,10 is normal filler rod among Fig. 3, and 3 and 7 is thin partially filler rod (slice), and 4 are fracture filler rod (disconnected bar).
The electric elements that the present invention adopts:
1. current signal source: adopt versatile signal generator and multiple signal sources such as power amplifier, controlled current direct current or AC power; This signal source belongs to all purpose instrument device, can market purchasing or self-control.
2. magneto-dependent sensor: adopt telefault or Hall element, as magnetic recording head, Hall element HZ3503 etc.
3. signal amplification, filtering circuit: be used for the amplification that signal is picked up in the magneto-dependent sensor inspection, can adopt market all purpose instrument amplifier on sale.Figure 2 shows that practical application circuit of the present invention.
4. real-time waveform goes out display device; Can use general purpose oscialloscope, the present invention adopts the V-1565 of Hitachi general purpose oscialloscope.
Claims (2)
1. a mouse cage asynchronous motor rotor broken bar, slice detection method is characterized in that:
1) on the die casting electric conductor of squirrel-cage asynchronous motor rotor, applies current signal;
2) survey squirrel-cage asynchronous motor rotor circumferential surface magnetic field intensity with magneto-dependent sensor, the magneto-dependent sensor signal obtains squirrel-cage asynchronous motor rotor circumferential surface magnetic field distribution figure through amplification, Filtering Processing;
3) judge that according to rotor circumference Surface field intensity distribution this asynchronous motor rotor has or not disconnected bar, slice and disconnected bar slice quantity and position.
2. a mouse cage asynchronous motor rotor broken bar, slice pick-up unit is characterized in that: comprise current signal source, magneto-dependent sensor, signal amplification circuit and filter circuit, detection signal real-time waveform display device; The current signal source is connected on the both ends of the surface die casting electric conductor of mouse cage asynchronous motor rotor, magneto-dependent sensor is at the circumferential surface near the mouse cage asynchronous motor rotor, detection signal along the circumferential direction connects detection signal real-time waveform display device through signal amplification circuit, filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610051854 CN1858612A (en) | 2006-06-08 | 2006-06-08 | Detecting method and its detecting device for squirrel cage asynchronous motor rotor broken strip and thin strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610051854 CN1858612A (en) | 2006-06-08 | 2006-06-08 | Detecting method and its detecting device for squirrel cage asynchronous motor rotor broken strip and thin strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1858612A true CN1858612A (en) | 2006-11-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610051854 Pending CN1858612A (en) | 2006-06-08 | 2006-06-08 | Detecting method and its detecting device for squirrel cage asynchronous motor rotor broken strip and thin strip |
Country Status (1)
| Country | Link |
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| CN (1) | CN1858612A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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) |
| CN102323549A (en) * | 2011-08-17 | 2012-01-18 | 北京航天控制仪器研究所 | A kind of motor automatic detection device |
| CN102608528A (en) * | 2011-12-01 | 2012-07-25 | 华南理工大学 | Defect detection method and device for motors |
| CN103018687A (en) * | 2012-11-23 | 2013-04-03 | 华北电力大学 | Method of measuring permanent magnet motor rotor field in real time |
| CN104714416A (en) * | 2013-12-11 | 2015-06-17 | 北车大连电力牵引研发中心有限公司 | Current source circuit and semi-physical simulation system |
| 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 |
-
2006
- 2006-06-08 CN CN 200610051854 patent/CN1858612A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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) |
| CN102323549A (en) * | 2011-08-17 | 2012-01-18 | 北京航天控制仪器研究所 | A kind of motor automatic detection device |
| CN102608528A (en) * | 2011-12-01 | 2012-07-25 | 华南理工大学 | Defect detection method and device for motors |
| CN103018687A (en) * | 2012-11-23 | 2013-04-03 | 华北电力大学 | Method of measuring permanent magnet motor rotor field in real time |
| CN104714416A (en) * | 2013-12-11 | 2015-06-17 | 北车大连电力牵引研发中心有限公司 | Current source circuit and semi-physical simulation system |
| 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 |
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