CN1473273A - Method and apparatus of nondestructive insulation test for small electric machine - Google Patents
Method and apparatus of nondestructive insulation test for small electric machine Download PDFInfo
- Publication number
- CN1473273A CN1473273A CNA018184715A CN01818471A CN1473273A CN 1473273 A CN1473273 A CN 1473273A CN A018184715 A CNA018184715 A CN A018184715A CN 01818471 A CN01818471 A CN 01818471A CN 1473273 A CN1473273 A CN 1473273A
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- CN
- China
- Prior art keywords
- coil
- electrical equipment
- corona discharge
- voltage
- miniature electrical
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- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
A nondestructive insulation test method for a small electric machine having a coil, comprising a step for bringing about a depressurized atmosphere in a container (2) containing the small electric machine (1) and applying a high frequency voltage to the coil of the small electric machine (1), and a step for detecting for generation of corona discharge from the small electric machine, wherein a decision is made whether the small electric machine is acceptable or not by a corona pulse increasing upon application of a high frequency voltage of 600-1100V between a winding coil and a laminate core.
Description
Technical field
The present invention relates to detect with very high sensitivity the test method and the device of the defective of the winding portion of miniature motor etc. and the state of insulation between the laminated core at nondestructive condition.
Background technology
Usually, in the use of miniature motor etc., insulation between winding and the laminated core is damaged, influence the main cause in life-span, be the electromagnet lead and the insulant (film of winding, resin) in winding process or in the motor assembling operation, because the strike of certain machinery or clamping apparatus etc., mechanical pressure or friction etc. and the crackle that produces, scar or pin hole etc., cause the electromagnet lead to contact or approaching unusually with laminated core, because electric in using, temperature, mechanical or chemical reason, produce insulation breakdown (so-called ground short circuit), abnormal currents such as short circuit current flow cause to such an extent that winding is heated and burns out.
In the past, checked the method for this state of insulation, AC voltage withstand test, insulation resistance test, partial discharge experiment with measuring, surge voltage (surge) test, decompression impulse voltage test, pinhole test and visual inspection etc. were arranged.Below these methods are illustrated.
In AC voltage withstand test and insulation resistance test, the electromagnet coil of conductive wire is injured quite big, and if directly do not contact with laminated core or approaching, then can not detect, and only is as object with ground short circuit.
The partial discharge experiment with measuring is the measure portion discharge, when the electromagnet lead contacts with laminated core, can test with high sensitivity.This is owing to the dielectric film across the electromagnet lead, judges whether partial discharge takes place between coil and laminated core, and the phenomenon that therefore normal electromagnet lead leaves laminated core a little is impossible detected.In addition, the partial discharge under reduced atmosphere is surveyed in the electric test, and also just the voltage of partial discharge generation beginning changes, and its detectability does not change.
Impulse voltage test is except effective for magnetic test coil scar contact laminated core, and the layer short circuit that produces because of the adjacent coil scar between coil and the coil is also effective for detecting, but is limited to the detection of coil scar.
The decompression impulse voltage test has high detectability for detecting the layer short circuit and the coil scar that produce because of the adjacent windings scar between coil and the coil, but contacts with laminated core or approaching phenomenon then can not detect for normal electromagnet lead.
Pinhole test is to add in the phenolphthalin solution and test be completely infused in saline solution by trial target, though can the magnetic test coil scar, this test is destructive test, can not check all over products.
Visual inspection is carried out in winding process and in the motor assembling operation, but only is surface inspection, and the position that can not see is a lot, and in addition, the problem of visual inspection maximum is to produce mistake, can not wish that it has satisfied effect.
As mentioned above, the test method of existing inspection state of insulation, approaching unusually for electromagnet lead that forms the insulation breakdown reason and laminated core, the phenomenon that will cause insulation breakdown in service in the near future, the requirement of in batch production process, all checking with high sensitivity, be unappeasable, exist following (a) and reach (b) described problem.
(a) be difficult to detect normal electromagnet lead and laminated core automatically unusually near the bad phenomenon under the state of (in the 1mm), in order to detect aforementioned disadvantages by electric approach, must produce electric discharge phenomena at rejected region, but then need high voltage (more than the 3000V) with civil power, so then whole miniature electrical equipment (particularly passing insulating paper) produces corona discharge, and information will be submerged.
(b) owing to apply high voltage, become destructive test, can not check all over products.
That is to say, existing test method is that detection level is relatively more serious (when the electromagnet lead has the coil scar, or the phenomenon that directly contacts of electromagnet lead and laminated core) state can not detect the unusual approaching state of normal electromagnet lead and laminated core.
The present invention makes in order to solve above-mentioned existing problem, purpose is to provide can utilize nondestructive inspection (NDI), to normal winding coil and laminated core unusually near the defect part under the state of (in the 1mm), Insulation Test method and the device in batch production process, all over products checked.
Summary of the invention
In order to address the above problem, the present invention, promptly in the harmless Insulation Test method of miniature electrical equipment with coil, comprise such step, be about to put into the container internal pressure decompression of miniature electrical equipment and the coil of miniature electrical equipment is applied the step of HF voltage and detects the step whether described miniature electrical equipment produces corona discharge; The corona pulse that described method utilization increases when applying the HF voltage of 600～1100V between winding coil and laminated core is judged quality.
Like this, can utilize nondestructive inspection (NDI) that normal winding coil and laminated core are carried out the inspection of all over products near the defect part of the state of (in the 1mm) unusually in batch production process.
The present invention is the harmless Insulation Test method with miniature electrical equipment of coil, it is characterized in that, comprise the 2nd step that the miniature electrical equipment that will have coil puts into the 1st step of container, described container is reduced pressure, described coil applied the 3rd step of HF voltage and judges whether described miniature electrical equipment produces the 4th step of corona discharge that it has can make bad position produce the effect of corona discharge with low-voltage.
Again, harmless Insulation Test device with miniature electrical equipment of coil of the present invention, it is characterized in that, by the container of accommodating described miniature electrical equipment, make the reliever that forms reduced atmosphere in the described container, described coil is applied the high frequency electric source of HF voltage and detects the high-frequency corona discharge measuring device that whether produces corona discharge from described miniature electrical equipment constitute, have at defective position and can make it produce the effect of corona discharge with low-voltage.
Description of drawings
Figure 1 shows that harmless Insulation Test device of the present invention.
Figure 2 shows that circuit of the present invention constitutes.
Fig. 3 represents to adopt the corona discharge of the tested motor (certified products) of one embodiment of the invention that beginning voltage takes place.
Fig. 4 represents to adopt the corona discharge of the defective phenomenon happening part of tested motor of one embodiment of the invention that beginning voltage takes place.
Figure 5 shows that the corona pulse generation frequency of one embodiment of the invention.
Specific embodiment
Utilize the description of drawings embodiments of the invention below.
Fig. 1 represents an embodiment of harmless Insulation Test method of the present invention.In Fig. 1,1 is tested motor (miniature electrical equipment), and 2 is decompression cabinet (container), and 3 is high-frequency corona discharge measuring device, and 4 is vacuum meter, and 5 is valve, and 6 is vacuum pump, and 7 is sleeve pipe, and 8 is terminals.
In atmospheric pressure, tested motor 1 is put into decompression cabinet 2, and tested motor 1 is connected to terminals 8, by sleeve pipe, is connected with the lead-in wire of motor winding coil again.
Reliever is made of vacuum pump 6, valve 5 and vacuum meter 4, and the decompression degree in the decompression cabinet 2 utilizes vacuum meter 4 to monitor, utilizes vacuum pump to be decompressed to the decompression degree of regulation by valve 5 simultaneously.The decompression degree of decompression cabinet 2 is according to testing preferably 65～200Torr, as long as carry out reduced pressure management according to the kind of testee (tested motor 1).
Usually when noting the decompression corona discharge, according to the Paschen theorem, sensitivity during 1～5Torr is the highest, but it is too active at this zone corona discharge, therefore insignificant noise corona discharge amount is too much, flowed or blow over and cover completely as the 1 electromagnet lead of the tested motor winding of wanting originally to detect and the corona discharge information that defective phenomenon produced of distance below 1mm of laminated core, signal to noise ratio (S/N ratio) is obviously reduced.
The HF voltage that high frequency electric source in high-frequency corona discharge measuring device 3 produces utilizes high-tension cable to draw, and is added in by lead-in wire on the coil of motor 1, if slowly raise added voltage, then produces corona discharge between motor winding and laminate core.
The corona discharge that produces in the winding (electromagnet lead) of miniature electrical equipment is broadly divided into two kinds, (1) be the discharge that produces by the insulant (film, resin etc.) that exists between electromagnet lead and the laminated core, (2) are the discharges that produces by air insulation between electromagnet lead and laminated core.
Phenomenon (1) is compared with phenomenon (2), and the specific inductive capacity of insulant is big, and it is low that beginning voltage takes place corona discharge, takes place more for a long time, and when applying high voltage, it is defective to be difficult to judge that phenomenon (2) produces.But, phenomenon (2) since electric, mechanical, temperature or chemistry at the probability height that causes in the future problem to take place, so must judge, detecting in advance.
For the problems referred to above, as long as use high frequency electric source (1～40kHz).This be because, the impedance (Z) with miniature electrical equipment of coil is (1/ ω C), and supply frequency (ω) is increased, then impedance reduces, the quantity of electric charge that flows through in the winding increases, and just can make bad position produce corona discharge with low-voltage.
Also have, reach the determination methods of the corona discharge of (2) as aforementioned (1), the corona pulse frequency that can utilize experiment to obtain (2) increases to about 1.5MHz, utilization realizes the method that be combined to form bandpass filter of low-pass filter (500kHz) with Hi-pass filter (2MHz) to judge and detects.
Figure 3 shows that the relation of beginning voltage and vacuum tightness takes place the corona discharge that produces from whole tested motor, the 1 electromagnet lead that Figure 4 shows that tested motor winding and the distance of laminated core begin the relation of voltage and vacuum tightness less than the corona discharge generation at the defective position of 0.3mm.
As this Fig. 3 and shown in Figure 4, must distinguish from the insignificant corona discharge of whole tested motor (the particularly corona discharge that produces by the slot for winding insulating paper) generation and the significant corona discharge that defective position produces.
With Fig. 2 this method is described below.To put between the winding and stator of tested motor 51 with the voltage that high frequency electric source 50 (can utilize transformer to boost to the high frequency electric source of MAX 3000V (O-P) at the sine wave signal that 1～50kHz changes frequency) produces.The corona discharge that utilizes at this moment tested motor to produce is with high fdrequency component and power supply stack.In this discharge pulse, also utilize testing circuit 52 to detect the corona pulse of the frequency of low-frequency band.In detected corona pulse, for the distance of 1 electromagnet lead distinguishing nonsensical corona discharge frequency and tested motor winding and laminated core corona discharge frequency, also utilize the bandpass filter 52 that forms by low-pass filter (500kHz) and Hi-pass filter (2.5MHz) to be distinguished less than the defective position of 1mm.
Therefore corona pulse utilizes AMP (amplifier) 54 that signal is amplified owing to be the low-down signal of level.In addition, because the corona pulse that produces for the negative voltage that is applied by high frequency electric source 50 also is that effectively pulse also is a negative pulse, therefore, all become positive pulse by absolute value circuit 55.
Then, corona pulse is counted with impulse meter 56 number of pulses, calculate discharge capacity with integrating circuit 57, in addition, detect the peak level of corona pulse with peak detctor 58, if defective position is arranged, it is defective then to utilize decision circuitry 59 to be judged as, by detecting like this.
Figure 5 shows that the result who utilizes said method the certified products of tested motor and tested motor with defective phenomenon to be compared measurement.
The tested motor of certified products produces the phenomenon that pulse increases from about 1050V, and by comparison, the tested motor with defective phenomenon increases from the 750V pulse.For tested motor,, just can judge certified products and unacceptable product by testing with 900V with this relation.
The possibility of utilizing on the industry
As mentioned above, adopt claim 1 and invention claimed in claim 2, can provide for normally Winding coil and laminated core be in unusually near the defect part utilization of (in the 1mm) state is harmless and check The Insulation Test method that can all check in batch production process can access described favourable effect Really.
Claims (3)
1. the harmless Insulation Test method of a miniature electrical equipment is characterized in that, comprises
The miniature electrical equipment that will have coil put into the 1st step of container,
With the 2nd step that reduces pressure in the described container,
To described coil apply HF voltage the 3rd step and
Judge whether described miniature electrical equipment produces the 4th step of corona discharge.
2. the harmless Insulation Test method of miniature electrical equipment as claimed in claim 1 is characterized in that,
At the 2nd step 65～2500Torr that reduces pressure in container, apply the HF voltage of 1～40kHz in the 2nd step.
3. harmless Insulation Test device, it is harmless Insulation Test device with miniature electrical equipment of coil, it is characterized in that, by the container that holds described miniature electrical equipment, make the reliever that forms reduced atmosphere in the described container, described coil is applied the high frequency electric source of HF voltage and judges that the high-frequency corona discharge measuring device whether described miniature electrical equipment is producing corona discharge constitutes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000343286A JP2002148300A (en) | 2000-11-10 | 2000-11-10 | Method and device for nondestructive insulation testing of small-sized electric machine |
| JP343286/2000 | 2000-11-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1473273A true CN1473273A (en) | 2004-02-04 |
| CN1216296C CN1216296C (en) | 2005-08-24 |
Family
ID=18817681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN018184715A Expired - Fee Related CN1216296C (en) | 2000-11-10 | 2001-11-08 | Method and apparatus of nondestructive insulation test for small electric machine |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2002148300A (en) |
| KR (2) | KR100705121B1 (en) |
| CN (1) | CN1216296C (en) |
| WO (1) | WO2002039128A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101910853A (en) * | 2008-06-25 | 2010-12-08 | 爱信艾达株式会社 | Insulation coated conductor testing method and apparatus |
| CN105182202A (en) * | 2015-09-29 | 2015-12-23 | 北京环境特性研究所 | Mini corona discharge detection device |
| CN106405342A (en) * | 2015-07-31 | 2017-02-15 | 斯凯孚公司 | Partial discharge detection relay matrix for multiple lead analysis |
| CN106526375A (en) * | 2016-10-28 | 2017-03-22 | 桂林理工大学 | Electrical insulation film pulse voltage accelerated aging experiment electromagnetic acting force generating device |
| CN110514999A (en) * | 2019-09-04 | 2019-11-29 | 青岛艾普智能仪器有限公司 | A kind of motor stator coil single-point damage testing method |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4749416B2 (en) * | 2005-03-02 | 2011-08-17 | トヨタ自動車株式会社 | Insulation inspection equipment |
| JP5267339B2 (en) * | 2009-06-04 | 2013-08-21 | アイシン・エィ・ダブリュ株式会社 | Coil nondestructive inspection method and apparatus |
| CN104698349B (en) * | 2015-01-16 | 2017-04-12 | 广东电网有限责任公司电力科学研究院 | Paper oil insulation partial discharge test device |
| KR102010062B1 (en) | 2017-12-15 | 2019-08-12 | 주식회사 포스코 | Coherence testing apparatus |
| JP6807492B1 (en) | 2020-03-27 | 2021-01-06 | 株式会社寺岡製作所 | Heat peeling adhesive tape |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5535657B2 (en) * | 1974-06-03 | 1980-09-16 | ||
| JPH07128392A (en) * | 1993-10-26 | 1995-05-19 | Mitsubishi Cable Ind Ltd | Nondestructive insulation tester |
| JP3261935B2 (en) * | 1995-08-02 | 2002-03-04 | 松下電器産業株式会社 | Non-destructive insulation test method and apparatus for small electric machine |
-
2000
- 2000-11-10 JP JP2000343286A patent/JP2002148300A/en not_active Withdrawn
-
2001
- 2001-11-08 CN CN018184715A patent/CN1216296C/en not_active Expired - Fee Related
- 2001-11-08 KR KR1020037006293A patent/KR100705121B1/en not_active IP Right Cessation
- 2001-11-08 KR KR1020057015106A patent/KR20050087887A/en not_active Application Discontinuation
- 2001-11-08 WO PCT/JP2001/009785 patent/WO2002039128A1/en not_active Application Discontinuation
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101910853A (en) * | 2008-06-25 | 2010-12-08 | 爱信艾达株式会社 | Insulation coated conductor testing method and apparatus |
| CN101910853B (en) * | 2008-06-25 | 2013-09-04 | 爱信艾达株式会社 | Insulation coated conductor testing method and apparatus |
| CN106405342A (en) * | 2015-07-31 | 2017-02-15 | 斯凯孚公司 | Partial discharge detection relay matrix for multiple lead analysis |
| CN105182202A (en) * | 2015-09-29 | 2015-12-23 | 北京环境特性研究所 | Mini corona discharge detection device |
| CN105182202B (en) * | 2015-09-29 | 2017-11-03 | 北京环境特性研究所 | One kind miniaturization corona discharge detection device |
| CN106526375A (en) * | 2016-10-28 | 2017-03-22 | 桂林理工大学 | Electrical insulation film pulse voltage accelerated aging experiment electromagnetic acting force generating device |
| CN106526375B (en) * | 2016-10-28 | 2023-04-07 | 桂林理工大学 | Electromagnetic acting force generating device for electrical insulation film pulse voltage accelerated aging experiment |
| CN110514999A (en) * | 2019-09-04 | 2019-11-29 | 青岛艾普智能仪器有限公司 | A kind of motor stator coil single-point damage testing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002148300A (en) | 2002-05-22 |
| KR20050087887A (en) | 2005-08-31 |
| CN1216296C (en) | 2005-08-24 |
| KR20040008114A (en) | 2004-01-28 |
| WO2002039128A1 (en) | 2002-05-16 |
| KR100705121B1 (en) | 2007-04-10 |
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| SE01 | Entry into force of request for substantive examination | ||
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Granted publication date: 20050824 Termination date: 20121108 |