CN102385024A - Equipment and method for detecting ground point of machine winding - Google Patents
Equipment and method for detecting ground point of machine winding Download PDFInfo
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- CN102385024A CN102385024A CN201110306411XA CN201110306411A CN102385024A CN 102385024 A CN102385024 A CN 102385024A CN 201110306411X A CN201110306411X A CN 201110306411XA CN 201110306411 A CN201110306411 A CN 201110306411A CN 102385024 A CN102385024 A CN 102385024A
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Abstract
The invention discloses equipment and a method for detecting a ground point of a machine winding. The method comprises the steps of loading direct current or single-phase alternating current onto a machine winding, moving a magnetic field detecting device on the winding, judging whether a magnetic field displayed by the magnetic field detecting device is subjected to sudden change, and if so, ensuring that the point where the magnetic filed is located is a grounding point. The equipment comprises a power supply device and the magnetic field detecting device, wherein the power supply device is used for applying the direct current or the single-phase alternating current onto the machine winding; the magnetic field detecting device is capable of detecting a magnetic field generated by the current applied onto the machine winding; and when the magnetic field is subjected to sudden change, the detected location is the grounding point of the machine winding. In the invention, the grounding point of the machine winding can be found quickly and rapidly, thereby improving the production efficiency and reducing the maintenance cost; the equipment and the method can thoroughly overcome the defects of a method of observing sparks by puncturing the machine winding, and the defects of overlarge errors caused by adoption of special cable grounding point searching equipment and a double-arm bridge; in addition, in the invention, the machine winding is not punctured with withstanding voltage by adopting high voltage, so that the safety is good.
Description
Technical field
The present invention relates to the detection of motor windings earth point, in particular to a kind of motor windings earth point checkout equipment and detection method.
Background technology
For a long time, motor windings ground connection is the main electric fault of motor, but the motor windings earth point is searched very inconvenience, because winding generally all is embedded into rotor and stator core slot the inside, adopts common manual type to search.With regard to present lookup method; If stake resistance is bigger; The general direct current pressurization that adopts: in the darkroom, adopt high direct voltage to carry out withstand voltage to winding; Making when winding earth point punctures fully to detect has no-spark, in case not or do not detect spark then can't find earth point, and adopt the method often to damage motor windings.And if stake resistance is less; Then adopt double bridge to come measuring resistance perhaps to adopt more existing special uses to search the instrument of cable grounding point; But the very big error of uncertain always generation of stake resistance; So can't accurately find the position of earth point, bring very big trouble to machinery check and repair.
Summary of the invention
To the problems referred to above, the present invention proposes a kind of motor windings earth point checkout equipment and detection method.
Said motor windings earth point checkout equipment comprises: electric supply installation, and it applies direct current or single-phase alternating current on motor windings; Detector for magnetic field, it can detect the magnetic field of the electric current generation that applies on the said motor windings; Wherein, when the sudden change of said magnetic field, the position of being detected is the motor windings earth point.
Said motor windings earth point detection method comprises: motor windings is loaded direct current or single-phase alternating current; Detector for magnetic field is moved on winding; Confirm that detector for magnetic field demonstrates magnetic field and whether suddenlys change; If then this is an earth point.
The present invention has following advantage and characteristics:
Can intuitively find out the earth point of motor windings rapidly, enhance productivity, reduce the cost of overhaul; Power supply is adjustable, can thoroughly solve to puncture the defective that motor windings is observed the method for disruptive spark; Solved and adopted the private cable earth point to search equipment and the too big defective of double bridge error; Do not adopt high pressure that motor windings is carried out withstand voltage puncture, so security is good.
Description of drawings
Fig. 1 is the process flow diagram of first embodiment of motor windings earth point detection method of the present invention;
Fig. 2 is the process flow diagram of second embodiment of motor windings earth point detection method of the present invention;
Fig. 3 is the synoptic diagram of first embodiment of motor windings earth point checkout equipment of the present invention;
Fig. 4 is the synoptic diagram of second embodiment of motor windings earth point checkout equipment of the present invention;
Fig. 5 is the synoptic diagram of the 3rd embodiment of motor windings earth point checkout equipment of the present invention;
Fig. 6 is the synoptic diagram of the 4th embodiment of motor windings earth point checkout equipment of the present invention;
Fig. 7 is the synoptic diagram of the 5th embodiment of motor windings earth point checkout equipment of the present invention;
Fig. 8 is the synoptic diagram of the 6th embodiment of motor windings earth point checkout equipment of the present invention;
Fig. 9 has shown an example of the distribution of current when having a plurality of motor windings earth point.
Embodiment
According to an aspect of the present invention, a kind of motor windings earth point detection method is provided.
In the first embodiment, as shown in Figure 1, during detection motor windings is loaded direct current (S1), wherein positive pole links to each other with motor windings, and negative pole links to each other with electric machine iron core.Certainly, connected mode also can be conversely, and negative pole links to each other with motor windings, and positive pole links to each other with electric machine iron core.After the energising, the detector for magnetic field that can detect the magnetic field of direct current generation moves on winding, detects magnetic field (S2) along winding.Confirm whether the detected magnetic field of detector for magnetic field has sudden change (S3).If there is sudden change in magnetic field; The maximal value of for example when detector for magnetic field is placed on positive pole, measuring sports zero; Perhaps sport said maximal value from zero, this detector for magnetic field when measuring begins to move or begin to move from negative pole from positive pole, and then this is earth point (S4).The direct current that wherein motor is loaded for example can be battery-powered, as long as the size of the electric current that produces makes the magnetic field around the winding can be detected by detector for magnetic field.
Further, if show the magnetic field sudden change, but not vanishing or said maximal value, then explanation is an earth point here, but stake resistance is very big, and explanation also has other earth points.Particularly, Anywhere, as long as detector for magnetic field equates and can both proving of changes of magnetic field occur to be earth point basically here with the distance of motor windings.As shown in Figure 9, a, b, c, 4 of d are four grounded point, but stake resistance is different, causes electric current different, are example with 3A, 2A, 1A in the drawings.When detector for magnetic field moves from a point to the d point, when moving to a point, magnetic field sudden change, so a point ground connection (magnetic field a is not 0).Continue the shifting magnetic field pick-up unit, during to the b point, find that magnetic field has sudden change again; Then b also is an earth point, so continues, and then can find a total a, b, c, the four grounded point of d; And magnetic field a＞magnetic field b＞magnetic field c＞magnetic field d=0, because the d point has not had electric current to pass through.
Preferably, detector for magnetic field slowly moves on motor windings when detecting.
Preferably, if magnetic field sudden change need consider that also whether detector for magnetic field and winding are apart from increase.This is because the winding outside of present all motors all is surrounded by the insulation course of fixed thickness; And thickness of insulating layer all is to set according to the motor rated voltage; Only need detector for magnetic field be placed on the insulation course of winding during measurement and get final product, demonstrate different magnetic field if measuring distance is different, then possibly interference arranged the outer insulation course of motor windings; Need the thickness of detection insulation course whether even, whether crack etc. is arranged.
Preferably, can regulate galvanic size, make detector for magnetic field can detect the magnetic field that electric current produced at said negative or positive electrode place according to the accuracy of detection of detector for magnetic field.The magnetic field data that for example demonstrates when detector for magnetic field hour increases galvanic voltage or electric current.
In second embodiment, as shown in Figure 2, during detection motor windings is loaded single-phase alternating current (S21).Wherein positive pole links to each other with motor windings, and negative pole links to each other with electric machine iron core.Single-phase alternating current can be through obtaining with external power supply (for example alternator).The detector for magnetic field that can detect the magnetic field of single-phase flow electricity generation moves on winding, detects magnetic field (S22) along winding.Confirm whether the detected magnetic field of detector for magnetic field has sudden change (S23).If sudden change is arranged; The maximal value of for example when detector for magnetic field is placed on positive pole, measuring sports zero; Perhaps sport said maximal value from zero, this detector for magnetic field when measuring begins to move or begin to move from negative pole from positive pole, and then this is earth point (S24).The size of the electric current of the single-phase alternating current that wherein motor is loaded makes the magnetic field around the winding can be detected by detector for magnetic field and gets final product.
Further, if show the magnetic field sudden change, but not vanishing of magnetic field or said maximal value, then explanation is an earth point here, but stake resistance is very big, and explanation also has other earth points (S6).Described in its principle such as top first embodiment with reference to accompanying drawing 9, repeat no more at this.
On winding, slowly move when preferably, detector for magnetic field detects.
Preferably, if magnetic field sudden change need consider that also whether detector for magnetic field and winding are apart from increase, detail such as top first embodiment are similar, repeat no more at this.
Preferably, can regulate the size of single-phase alternating current, make detector for magnetic field can detect the magnetic field that electric current produces according to the accuracy of detection of detector for magnetic field.The magnetic field data that for example demonstrates when detector for magnetic field hour increases the voltage or the electric current of single-phase alternating current.
According to a second aspect of the invention, a kind of motor windings earth point checkout equipment is provided.
In first embodiment, as shown in Figure 3, earth point checkout equipment 1001 is a split-type structural, and it comprises electric supply installation 100 and detector for magnetic field 200.Wherein electric supply installation 100 can provide direct current, and detector for magnetic field 200 can detect the magnetic field that direct current produces, and these two devices all can for example adopt battery that they are supplied power.Said electric supply installation 100 comprises and its positive pole 9 and negative pole 10 that links to each other through lead.Said detector for magnetic field 200 comprises the magnetic field display unit 201 that is used to show detected magnetic field data.
During detection motor windings is loaded direct current, wherein anodal 9 link to each other with motor windings, and negative pole 10 links to each other with electric machine iron core, and certain, connected mode also can be conversely, and negative pole 10 links to each other with motor windings, and positive pole 9 links to each other with electric machine iron core.After the energising; Detector for magnetic field 200 is moved on winding; When demonstrating the magnetic field data sudden change on the magnetic field of detector for magnetic field 200 display unit 201, the maximal value of for example when detector for magnetic field is placed on positive pole, measuring sports zero, perhaps sports said maximal value from zero; This detector for magnetic field when measuring begins to move or begin to move from negative pole from positive pole, and then this point is the motor windings earth point.
If the sudden change of the magnetic field data on the magnetic field display unit 201, but be not vanishing or said maximal value, ground connection here then is described, but stake resistance is very big, and explanation also has other earth points.Particularly, Anywhere, as long as detector for magnetic field equates and can both proving of changes of magnetic field occur to be earth point basically here with the distance of motor windings.As shown in Figure 9, a, b, c, 4 of d are four grounded point, but stake resistance is different, causes electric current different.When detector for magnetic field moves from a point to the d point, when moving to a point, magnetic field sudden change, so a point ground connection (magnetic field a is not 0).Continue the shifting magnetic field pick-up unit, during to the b point, find that magnetic field has sudden change again; Then b also is an earth point, so continues, and then can find a total a, b, c, the four grounded point of d; And magnetic field a＞magnetic field b＞magnetic field c＞magnetic field d=0, because the d point has not had electric current to pass through.
On winding, slowly move when preferably, detector for magnetic field 200 detects.
Preferably, if the magnetic field data on the magnetic field display unit 201 sudden change need consider that also whether detector for magnetic field 200 and winding are apart from increase.This is because the winding outside of present all motors all is surrounded by the insulation course of fixed thickness; And thickness of insulating layer all is to set according to the motor rated voltage; Only need detector for magnetic field be placed on the insulation course of winding during measurement and get final product, demonstrate different magnetic field if measuring distance is different, then possibly interference arranged the outer insulation course of motor windings; Need the thickness of detection insulation course whether even, whether crack etc. is arranged.
Preferably, said electric supply installation 100 also comprises regulon 102.Can be according to the accuracy of detection of detector for magnetic field 200; Regulate the galvanic voltage of electric supply installation 100 output or the size of electric current through regulon 102, thus make anodal 9 or the maximum value of magnetic field that records of negative pole 10 places on detector for magnetic field, have suitable reading.The magnetic field data that for example demonstrates when detector for magnetic field hour increases the output voltage or the electric current of electric supply installation 100.More preferably, said electric supply installation 100 also comprises power supply display unit 101, shows the size of the current curtage of electric supply installation 100.
In a second embodiment, as shown in Figure 4, earth point checkout equipment 1002 is a split-type structural, and different with first embodiment is that electric supply installation 100 also comprises rectification unit 103 (rectification circuit).Rectification unit 103 with three-phase or two-phase alternating current convert into direct current offer anodal 9 with negative pole 10.
Three-phase or two-phase alternating current are loaded into motor around last after being converted into direct current through rectification unit 103 during detection, and wherein anodal 9 link to each other with motor windings, and negative pole 10 links to each other with electric machine iron core.The testing process of earth point checkout equipment 1002 is identical with the first embodiment principle recited above, repeats no more at this.
One of second embodiment of above-mentioned earth point checkout equipment is modified to, and said rectification unit 103 can be converted into single-phase alternating current with three-phase or two-phase alternating current, is loaded on the motor windings with negative pole 10 through anodal 9.Correspondingly, said detector for magnetic field 200 is the detector for magnetic field that can detect the magnetic field of single-phase alternating current generation.
In the 3rd embodiment, as shown in Figure 5, earth point checkout equipment 1003 is an integral structure.It comprises electric supply installation 300 and detector for magnetic field 400.Wherein electric supply installation 300 can provide direct current, and detector for magnetic field 400 can detect the magnetic field that direct current produces.Said electric supply installation 300 comprises and its positive pole 9 and negative pole 10 that links to each other through lead.Said detector for magnetic field 400 comprises the magnetic field display unit 401 and the probe that is positioned at outside the casing 12 that is used to show detected magnetic field data, and probe is connected to detector for magnetic field 400 through power lead and data line.
During detection motor windings is loaded direct current, wherein anodal 9 link to each other with motor windings, and negative pole 10 links to each other with electric machine iron core, and perhaps negative pole 10 links to each other with motor windings, and positive pole 9 links to each other with electric machine iron core.After the energising; With probe with winding that anodal 9 link to each other on mobile; When the magnetic field data that demonstrates on the magnetic field display unit 401 suddenlyd change, the maximal value of for example when detector for magnetic field is placed on positive pole, measuring sported zero, perhaps sported said maximal value from zero; This detector for magnetic field when measuring begins to move or begin to move from negative pole from positive pole, and then this is the motor windings earth point.If the sudden change of the magnetic field data on the magnetic field display unit 401, but be not vanishing or said maximal value, ground connection here then is described, but stake resistance is very big, and explains to also have other earth points, specifically of first embodiment in second aspect present invention.
Preferably, the probe of detector for magnetic field 400 slowly moves on winding when detecting.
Preferably, if the magnetic field data on the magnetic field display unit 401 sudden change need consider that also whether detector for magnetic field 400 and winding are apart from increase, its details is of first embodiment in second aspect.
Preferably, said electric supply installation 300 also comprises regulon 302.Can be according to the accuracy of detection of detector for magnetic field 400; Regulate the galvanic voltage swing of electric supply installation 300 output through regulon 302, thus make said anodal 9 or the magnetic field that produces of negative pole 10 places' electric currents suitable reading is arranged on detector for magnetic field.The magnetic field data that for example demonstrates when detector for magnetic field hour increases the output voltage of electric supply installation 300.More preferably, said electric supply installation 300 also comprises power supply display unit 301, shows the current size of current of electric supply installation 300.
In the 4th embodiment, as shown in Figure 6, earth point checkout equipment 1004 is an integral structure.What they were different with the 3rd embodiment is that electric supply installation 300 also comprises rectification unit 303.Rectification unit 303 with three-phase or two-phase alternating current convert into direct current offer anodal 9 with negative pole 10.
Three-phase or two-phase alternating current are loaded on the motor windings after being converted into direct current through rectification unit 303 during detection, and wherein anodal 9 link to each other with motor windings, and negative pole 10 links to each other with electric machine iron core.The testing process of earth point checkout equipment 1004 is identical with the second embodiment principle recited above, repeats no more at this.
One of the 4th embodiment of above-mentioned earth point checkout equipment is modified to, and said rectification unit 303 can be converted into single-phase alternating current with three-phase or two-phase alternating current, is loaded on the motor windings with negative pole 10 through anodal 9.Correspondingly, said detector for magnetic field 400 is the detector for magnetic field that can detect the magnetic field of single-phase alternating current generation.
In the 5th embodiment, as shown in Figure 7, earth point checkout equipment 1005 is an integral structure.Dc constant voltage source (for example battery) in the casing 12 is divided into two-way, and the output current power lead 11 of leading up to is input to positive pole 9 and negative pole 10.Positive pole 9 is connected respectively on motor windings and the electric machine iron core with negative pole 10, also can connect conversely.Output voltage adjusting knob 4 is used to regulate the voltage in the dc constant voltage source after the said conversion, and corresponding output voltage scale adjustment disk 3 is used to show the amplitude of accommodation.Output DC stream display screen 6 passes through the electric current of winding to iron core in the time of can showing test.Output DC stream display screen 6 can be digital display screen, graduation apparatus, LCDs etc.
Another road in dc constant voltage source supplies power to detector for magnetic field 8 through power lead 7 '.Thereby detector for magnetic field 8 slowly moves along winding and obtains the data in detected magnetic field, and detected magnetic field data turns back in the casing 12 through magnetic field data line 7, and is shown on the magnetic field display screen 5.Thereby can judge the size in the magnetic field that the electric current in the winding produces, further judge the size that whether electric current is arranged in the winding or roughly judge electric current.
Particularly; If magnetic field sudden change; The maximal value of for example measuring when the positive pole from the probe placement of detector for magnetic field sports zero; Perhaps sport said maximal value from zero, this probe of detector for magnetic field when measuring begins to move or begin to move from negative pole from positive pole, and then this is the motor windings earth point.
If the magnetic field data sudden change, but be not vanishing or said maximal value, get rid of detector for magnetic field and winding apart from increasing factor, ground connection here then is described, but stake resistance is very big, and explanation also has other earth points.So can judge several earth points in the motor windings simultaneously.As shown in Figure 9, a, b, c, 4 of d are four grounded point, but stake resistance is different, causes electric current different, if respectively measure magnetic field a, b, c, d, at 4, can find the magnetic field sudden change, and magnetic field a＞magnetic field b＞magnetic field c＞magnetic field d=0.Have any need to prove, not necessarily must begin to measure from high-pressure side during measurement, for example also be fine to a point measurement from the d point, only magnetic field progressively becomes big in the mobile probe process.
In the 6th embodiment, as shown in Figure 8, earth point checkout equipment 1006 is an integral structure.The three-phase or the two-phase alternating current source that are provided by the outside are input in the casing 12 of motor windings earth point checkout equipment 1006 through external power supply plug 2, external power supply wire 1.The alternating current of input is divided into two-way; Lead up to and change into the dc constant voltage source after the full-wave rectifying circuit (not shown) rectification of SCR rectification circuit for example; Be input to through output current power lead 11 anodal 9, with positive pole 9 and negative pole 10 be connected on the motor windings respectively and electric machine iron core on.Can regulate the voltage in the dc constant voltage source after the said conversion through output voltage adjusting knob 4.Output DC stream display screen 6 passes through the electric current of winding to iron core in the time of can showing test.Output DC stream display screen 6 can be digital display screen, graduation apparatus, LCDs etc.
Another road of the alternating current of input supplies power to detector for magnetic field 8 through power lead 7 '.Thereby detector for magnetic field 8 slowly moves along winding and obtains the data in detected magnetic field; Detected magnetic field data turns back in the casing 12 through magnetic field data line 7; And on magnetic field display screen 5, show; Thereby can judge and pass through the size that electric current produces magnetic field in the winding, further judge the size that whether electric current is arranged in the winding or roughly judge electric current.
Particularly; If magnetic field sudden change, the maximal value of for example measuring when the positive pole from the probe placement of detector for magnetic field sports zero, perhaps sports said maximal value from zero; This depends on that probe begins to move or begin to move from negative pole from positive pole, and then this point is the motor windings earth point.
If the magnetic field data sudden change, but be not vanishing or said maximal value, get rid of detector for magnetic field and winding apart from increasing factor, ground connection here then is described, but stake resistance is very big, and explanation also has other earth points.So can judge several earth points in the motor windings simultaneously.
One of the 6th embodiment of above-mentioned earth point checkout equipment is modified to, and earth point checkout equipment 1006 also comprises a rectification unit, and it can be converted into single-phase alternating current with three-phase or two-phase alternating current, is loaded on the motor windings with negative pole 10 through anodal 9.Correspondingly, the probe of detector for magnetic field 8 is the detector for magnetic field that can detect the magnetic field of single-phase alternating current generation.
In addition, the earth point checkout equipment among above-mentioned each embodiment can also have too high protection of output voltage and the excessive protective device of output current.
Claims (13)
1. a motor windings earth point checkout equipment is characterized in that, comprising:
Electric supply installation, it applies direct current or single-phase alternating current on motor windings;
Detector for magnetic field, it can detect the magnetic field of the electric current generation that applies on the said motor windings;
Wherein, when the sudden change of said magnetic field, the position of being detected is the motor windings earth point.
2. motor windings earth point checkout equipment according to claim 1 is characterized in that, when the electric supply installation output DC, said electric supply installation comprises:
Rectification unit, its alternating current with the external world converts direct current into and is applied on the motor windings.
3. motor windings earth point checkout equipment according to claim 2 is characterized in that said electric supply installation comprises:
Positive pole, it links to each other with motor windings or electric machine iron core;
Negative pole, it correspondingly links to each other with electric machine iron core or motor windings.
4. motor windings earth point checkout equipment according to claim 1 is characterized in that, when electric supply installation output single-phase alternating current, said electric supply installation comprises:
Rectification unit, its alternating current with the external world converts single-phase alternating current into and is applied on the motor windings.
5. motor windings earth point checkout equipment according to claim 4 is characterized in that said electric supply installation comprises:
Positive pole, it links to each other with motor windings;
Negative pole, it links to each other with electric machine iron core.
6. motor windings earth point checkout equipment according to claim 1 is characterized in that said detector for magnetic field comprises:
Probe, it closes on motor windings and places in testing process;
The magnetic field display unit, it shows the size in detected magnetic field.
7. motor windings earth point checkout equipment according to claim 1 is characterized in that said electric supply installation comprises:
The power supply display unit, it shows the output voltage or the output current of said electric supply installation;
Regulon, it regulates the output voltage or the output current of said electric supply installation.
8. motor windings earth point checkout equipment according to claim 7 is characterized in that said power supply display unit is graduation apparatus or LCDs.
9. motor windings earth point checkout equipment according to claim 7 is characterized in that said regulon comprises:
The voltage-regulation knob, it regulates the output voltage or the output current of said electric supply installation;
The voltage calibration adjustment disk is used to show the amplitude of accommodation of said voltage-regulation knob.
10. motor windings earth point checkout equipment according to claim 1 is characterized in that, when the electric supply installation output DC, said electric supply installation is the adjustable dc constant voltage of voltage source.
11. motor windings earth point checkout equipment according to claim 1 is characterized in that, said when sporting non-vanishing or detected maximum field value, the point that is then detected is the motor windings earth point, and also has other earth points.
12. a motor windings earth point detection method is characterized in that, comprising:
Motor windings is loaded direct current (S1);
The detector for magnetic field that can detect the magnetic field of direct current generation moves on winding, detects magnetic field (S2) along winding;
Confirm whether the detected magnetic field of detector for magnetic field has sudden change (S3);
If there is sudden change in magnetic field, then this is earth point (S4).
13. a motor windings earth point detection method is characterized in that, comprising:
Motor windings is loaded single-phase alternating current, wherein anodally link to each other, negative pole link to each other with electric machine iron core (S21) with motor windings;
The detector for magnetic field that can detect the magnetic field of single-phase flow electricity generation moves on winding, detects magnetic field (S22) along winding;
Confirm whether the detected magnetic field of detector for magnetic field has sudden change (S23);
If there is sudden change in magnetic field, then this is earth point (S24).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110306411XA CN102385024A (en) | 2011-10-11 | 2011-10-11 | Equipment and method for detecting ground point of machine winding |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110306411XA CN102385024A (en) | 2011-10-11 | 2011-10-11 | Equipment and method for detecting ground point of machine winding |
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| CN102385024A true CN102385024A (en) | 2012-03-21 |
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| CN201110306411XA Pending CN102385024A (en) | 2011-10-11 | 2011-10-11 | Equipment and method for detecting ground point of machine winding |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103728525A (en) * | 2012-10-11 | 2014-04-16 | 特克特朗尼克公司 | Automatic probe ground connection checking techniques |
| CN105974241A (en) * | 2016-06-24 | 2016-09-28 | 中国神华能源股份有限公司 | Method and equipment for detecting contact failure of major axis grounding carbon brush |
| CN107037315A (en) * | 2017-04-16 | 2017-08-11 | 赵洁 | A kind of large-scale workshop inspector uses machine winding detection means |
| CN113163241A (en) * | 2020-01-22 | 2021-07-23 | 海信视像科技股份有限公司 | Display device |
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| CN201269924Y (en) * | 2008-10-24 | 2009-07-08 | 西安西工大思强科技有限公司 | Composite magnetic flux magnetic field measurement instrument |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728525A (en) * | 2012-10-11 | 2014-04-16 | 特克特朗尼克公司 | Automatic probe ground connection checking techniques |
| CN103728525B (en) * | 2012-10-11 | 2018-06-22 | 特克特朗尼克公司 | Automatic probe grounding connection Examined effect |
| US10041975B2 (en) | 2012-10-11 | 2018-08-07 | Tektronix, Inc. | Automatic probe ground connection checking techniques |
| CN105974241A (en) * | 2016-06-24 | 2016-09-28 | 中国神华能源股份有限公司 | Method and equipment for detecting contact failure of major axis grounding carbon brush |
| CN107037315A (en) * | 2017-04-16 | 2017-08-11 | 赵洁 | A kind of large-scale workshop inspector uses machine winding detection means |
| CN107037315B (en) * | 2017-04-16 | 2019-09-20 | 赵浩 | A kind of large size workshop inspector machine winding detection device |
| CN113163241A (en) * | 2020-01-22 | 2021-07-23 | 海信视像科技股份有限公司 | Display device |
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Application publication date: 20120321 |