CN116670503A - Defect detection device, defect detection method, defect detection system, and method for manufacturing rotating electrical machine - Google Patents
Defect detection device, defect detection method, defect detection system, and method for manufacturing rotating electrical machine Download PDFInfo
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- CN116670503A CN116670503A CN202180089571.5A CN202180089571A CN116670503A CN 116670503 A CN116670503 A CN 116670503A CN 202180089571 A CN202180089571 A CN 202180089571A CN 116670503 A CN116670503 A CN 116670503A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N27/92—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating breakdown voltage
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- 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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Abstract
In the conventional inspection apparatus, although the presence of a defect such as a pinhole that completely penetrates can be known, it is difficult to detect a defect to such an extent that the metal wire is not exposed. In order to solve the problem, the insulating film is provided with an electrode (8), wherein the electrode (8) is immersed with a conductive liquid (7), the conductive liquid (7) is in contact with the periphery of an insulator layer of the electromagnetic wire (2), and the defect of the insulating film is detected by measuring the discharge charge amount of partial discharge generated between the electromagnetic wire (2) and the conductive liquid (7).
Description
Technical Field
The present application relates to a defect detection device, a defect detection method, a defect detection system, and a method for manufacturing a rotating electrical machine.
Background
In general, an electrical insulation treatment is performed by coating the surface of an electromagnetic wire wound around a coil of a rotating electrical machine or a transformer with varnish. If defects such as scratches, bubbles, pinholes, etc. are present in the varnish layer, the defects may be electrically fragile portions, and may be the starting points of breakage when a voltage is applied.
In the prior art, as a method for detecting defects in an insulating film, there are the following methods: the soft pad impregnated with the conductive liquid is brought into contact with the insulating film, and the defect position is determined based on the change in on-resistance due to the pinhole. (for example, refer to patent document 1)
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 5-332981
Disclosure of Invention
Problems to be solved by the application
In such a pinhole inspection method and inspection apparatus, although the presence of a defect such as a pinhole that completely penetrates can be known, in the case where there is a flaw of the varnish layer to such an extent that the metal wire of the magnet wire is not exposed or a defect that does not penetrate due to air bubbles, there is a problem in that it is difficult to detect the defect from a change in on-resistance.
The present application has been made to solve the above-described problems, and an object of the present application is to provide a defect detection device, a defect detection method, a defect detection system, and a method for manufacturing a rotating electrical machine, which can detect a defect of an insulating film that is not penetrated in a nondestructive manner.
Means for solving the problems
The defect detection device disclosed by the application is characterized by comprising: an electrode which is impregnated with a conductive liquid and is formed so that the conductive liquid contacts the periphery of the insulator layer of the electromagnetic wire; and a partial discharge detection device connected in parallel with the electrode, the electrode applying an alternating voltage between the magnet wire and the conductive liquid, and detecting a defect of the insulating coating of the magnet wire by measuring a discharge charge amount of partial discharge generated between the magnet wire and the conductive liquid using the partial discharge detection device.
Effects of the application
According to the defect detection device disclosed by the application, the defect of the insulating coating film of the electromagnetic wire can be detected in a non-destructive mode.
Drawings
Fig. 1 is a conceptual diagram of the structure of a coil winding device provided with the defect detection device of embodiment 1.
Fig. 2 is a diagram showing the configuration of the defect detection apparatus according to embodiment 1.
Fig. 3 is a conceptual diagram of the structure of a magnet wire of the round wire type inspected by the defect detecting device of embodiment 1.
Fig. 4 is a conceptual diagram of the structure of a flat wire type magnet wire inspected by the defect detection apparatus of embodiment 1.
Fig. 5 is a diagram showing the relationship among a motor coil wound around an iron core, a wet electrode, and an encoder in defect detection according to embodiment 1.
Fig. 6 is a diagram illustrating a relationship of distances for calculating defect positions for defect detection according to embodiment 1.
Fig. 7 is a flowchart illustrating a measurement procedure of the defect detection apparatus according to embodiment 1.
Fig. 8 is a view showing a stator in which teeth of a motor coil are arranged in a circle as viewed from the axial direction.
Fig. 9 is a diagram showing the structure of another defect detecting device according to embodiment 1.
Fig. 10 is a conceptual diagram of the structure of the liquid supply mechanism of the conductive liquid tank according to embodiment 1.
Fig. 11 is a structural diagram of a wet electrode of the defect detection device according to embodiment 2.
Fig. 12 is a structural diagram of a wet electrode of the defect detection device of embodiment 3.
Fig. 13 is a conceptual diagram of the structure of the electromagnetic wire winding system according to embodiment 4.
Fig. 14 is a hardware configuration diagram of a control device of the defect detection device according to embodiment 1.
Detailed Description
Hereinafter, preferred embodiments of the defect detecting device according to the present application will be described with reference to the accompanying drawings. The same reference numerals are given to the same contents and corresponding parts, and detailed description thereof is omitted. In the following embodiments, the same reference numerals are given to the same components, and redundant description is omitted.
Embodiment 1.
Embodiment 1 will be described below with reference to the drawings. Fig. 1 shows a coil winding apparatus 100, and shows the arrangement of an electromagnetic wire insulation coating defect detection apparatus (hereinafter referred to as defect detection apparatus 200) and the positional relationship with other apparatuses.
The coil winding device 100 draws the magnet wire 2 as a material from the bobbin 1, and the bobbin 1 is placed with its axial direction perpendicular to the ground. The led magnet wire 2 passes through the tensioner 3 and is wound into a motor coil 5 through the nozzle 4.
The electromagnetic wire 2 in the section from the tensioner 3 to the motor coil 5 is held at a predetermined tension by the tensioner 3. The magnet wire 2 is electrically connected to the winding start end of the spool 1.
The defect detecting device 200 of the present embodiment is disposed in a region between the tensioner 3 and the nozzle 4, and is disposed at a position crossing the moving line of the magnet wire 2. The coil winding apparatus 100 is classified into a spindle winding method, a flyer winding method, a nozzle winding method, and the like according to winding methods, but the defect detection apparatus 200 of the present embodiment can be applied to any winding method.
Fig. 2 shows a configuration of a defect detection apparatus 200 according to embodiment 1. A conductive liquid tank 6 is provided, and a conductive liquid 7 is filled therein. Rectangular parallelepiped wet electrodes 8A and 8B made of a soft and hygroscopic felt material are provided on the upper portion of the conductive liquid tank 6, and the magnet wire 2 is disposed between the wet electrodes 8A and 8B. The wet electrodes 8A and 8B are held by the magnet wire 2 by a clamp 9, and the clamp 9 is fixed to the coil winding device 100 or the conductive liquid tank 6. That is, the rectangular parallelepiped wet electrodes 8A and 8B are in contact with each other with the magnet wire 2 interposed therebetween.
The lower portion of the wet electrode 8 is immersed in the conductive liquid 7. The wet electrode 8 is hygroscopic and is therefore wetted by the conductive liquid 7. Further, since the wet electrode 8 is soft, it is pressed against the magnet wire 2 by the clamp 9, thereby making contact with the entire circumference of the magnet wire 2 in the region of the electrode width D1. That is, in the region of the electrode width D1, the conductive liquid 7 is in contact with the entire circumference of the magnet wire 2. With this structure, the conductive liquid 7 can be efficiently brought into contact with the surface of the magnet wire 2.
The magnet wire 2 moves while ensuring a contact area with the wet electrode 8 by the winding operation of the coil winding device 100 to the motor coil 5.
The lower part of the metal electrode 10 connected to the power source V and the partial discharge detection device P is immersed in the conductive liquid 7, and a measurement voltage is applied to the conductive liquid 7. Since the wet electrode 8A and the wet electrode 8B are wetted with the conductive liquid 7, a voltage is applied to the entire circumference of the magnet wire 2 in the region of the electrode width D1 by connecting the power source V.
The partial discharge detection device P is connected in parallel with the voltage application circuit. When partial discharge is generated in the region of the electrode width D1, the partial discharge detection device P detects a change in voltage or current in the circuit caused by the discharge.
As a method of detecting the occurrence of partial discharge, there is a method of placing a sensor outside a voltage application circuit and capturing discharge light and electromagnetic waves accompanying the partial discharge, but this configuration can perform discharge detection with higher sensitivity by directly acquiring an electric signal in the circuit.
Fig. 3 is a cross-sectional view of the magnet wire 2 of the round wire type cut perpendicularly to the axial direction. The magnet wire 2 is constituted as follows: the conductor 21 is provided in the axial center portion, and the insulator layer 22 covers the entire surface of the conductor 21 with a predetermined film thickness.
Fig. 4 is a cross-sectional view of the magnet wire 2 of the flat angle wire type cut perpendicularly to the axial direction, and the basic structure is the same as that of the round wire type of fig. 3 except that the cross-sectional shape of the conductor 21 is square.
With such a structure, the electrical defect in the insulator layer 22 of the magnet wire 2 can be continuously detected in a nondestructive manner by the following measurement method.
[ measurement method ]
In the measurement, as described above, the power source V is connected, and an alternating voltage is applied to the outer peripheral surface of the magnet wire 2 in the region of the electrode width D1.
When there is a pinhole defect penetrating the insulator layer 22 in the measurement region of the electrode width D1, the conductive liquid 7 is in direct contact with the conductor 21 inside the insulator layer 22, and thus a current is detected when a voltage is applied, and an insulation defect can be detected in the region of the electrode width D1. Further, even when the electrically fragile portion which does not penetrate the insulator layer 22 passes through the measurement region of the electrode width D1, the defect can be detected from the change in the partial discharge waveform in the front and rear directions.
Further, when the winding operation is performed in the coil winding device 100, the magnet wire 2 inevitably passes through the electrode width D1 region of the defect detecting device 200, and therefore, the defect of the entire region of the magnet wire 2 can be inspected before it is wound as the motor coil 5 as a product. Thus, by applying the defect position specifying method described later, the defect position in the motor coil after winding can be grasped. Further, since the size of the defect can be detected from the detected discharge signal, a large defect portion can be removed before winding into the motor coil by determining the threshold value of the discharge signal in advance.
Next, a method of determining the defect position after being wound into the motor coil 5 will be described with reference to fig. 5. Fig. 5 is a diagram showing the relationship among the motor coil 5 wound around the core 11, the wet electrode 8, and the encoder E at the time of defect detection. Fig. 5 (a) shows a structure until the magnet wire 2 is wound into the motor coil 5 when the teeth of the core 11 are viewed in the protruding direction toward the core back. The distance T1 of the coil is a length along the circumferential direction of the motor, and the distance T2 of the coil is a length along the axial direction of the motor.
Electromagnetic wire 2 as motorThe coil 5 is wound around the teeth of the core 11. In addition, for easy understanding, fig. 5 (b) shows a perspective view of the motor coil 5 wound on the insulator 12 of the core 11. As shown in fig. 6, the distance L from the wet electrode 8 to the tip of the nozzle 4 is grasped in advance 1 Distance L from the front end of nozzle 4 to motor coil 5 2 The distance T1 in the short side direction and the distance T2 in the long side direction of the motor coil 5, and the elongation of the magnet wire 2 under winding tension.
An encoder E is provided between the wet electrode 8 and the nozzle 4 of the defect detecting device 200, and the distance (length) is measured based on the speed at which the magnet wire 2 passes through the encoder E. The signal from the partial discharge detector P and the signal from the encoder E are taken in the PC, and the winding distance until the defect is detected and the winding distance after the detection are recorded with the distance from the winding start of the motor coil 5 as the zero point. Then, based on the data of the winding distance from the encoder E, the known distance L 1 、L 2 The elongation of the magnet wire 2 following the winding tension, T1, T2, and what number of turns the defect is located on the motor coil 5 can be accurately determined by calculation.
Fig. 7 shows the flow of the measurement step. The measurement flow is performed by the control device PC, which controls the wet electrode 8, the partial discharge detection device P, and the encoder E in accordance with the measurement flow, and performs measurement.
Fig. 14 shows an example of hardware of the control device PC. The processor 1000 and the storage device 2000 are configured, but the storage device 2000 includes a volatile storage device such as a random access memory and a nonvolatile auxiliary storage device such as a flash memory, although not shown. In addition, an auxiliary storage device including a hard disk may be provided instead of the flash memory. The processor 1000 executes a program input from the storage device 2000 to execute a measurement flow described below. In this case, the program is input from the auxiliary storage device to the processor 1000 through the volatile storage device. The processor 1000 may output data such as the calculation result and the measurement value to the volatile memory device of the storage device 2000, or may store the data in the auxiliary storage device via the volatile memory device.
First, winding is started by the coil winding device 100, and counting of the distance of the encoder E is started (step S1). When no defect is detected until the winding is completed, the work is replaced to start the next winding (step S12). When a defect is detected (step S2), a distance E of the count at the time of detection is obtained 1 And stored in the control device PC (step S3). At the acquisition distance E 1 At the same time as starting for taking the distance E 2 Is performed (step S4). Total distance R of magnet wire 2 required for complete winding total And a distance E at which a defect is detected 1 The comparison is performed (step S5). In the comparison, the distance E is set in advance 1 From a known distance L at the beginning of winding 1 And distance L 2 Addition (see the distance relationships of fig. 6).
At a distance E 1 Distance of +L 1 Distance of +L 2 Less than the total distance R total When (step S5), the distance E is calculated 1 Distance of +L 1 Distance of +L 2 The defect position on the corresponding motor coil 5 is recorded in the control device PC (step S9). By a distance E at which defects will be detected 1 From the detection of the defect to the present 2 Adding to obtain the distance E from the winding start to the current 1 (step S11), continue distance E 1 Is a count of (a) of (b). At this time, the distance E 2 Reset (step S10).
When distance E 1 Distance of +L 1 Distance of +L 2 Equal to the total distance R total Or greater than the total distance R total In this case, it is estimated that the trace-back distance L is from the point where winding is completed 1 Distance of +L 2 A defect is generated at any position within the range up to the location of (3) to replace the workpiece (step S7), and the position of L is calculated 1 +L 2 -E 2 The corresponding defective position on the motor coil 5 (see the distance relationships of fig. 6) is recorded in the control device PC (step S8). After recording, the distance E obtained by counting 1 Distance E 2 Reset (step S9).
Since the distance count is reset every time the workpiece of the motor coil 5 is replaced, the deviation between the distance reading amount of the encoder E and the actual feeding amount of the magnet wire 2 does not increase with the progress of the production of the motor coil 5.
As an example, although the method of determining the defect position in the spindle winding method is shown, the defect position can be determined in the flyer winding method or the nozzle winding method.
By the above-described measurement flow, the position of the defect on the wound motor coil 5 can be accurately grasped. For example, if the motor is a single-tooth core motor, only defective teeth are eliminated in advance, so that the occurrence of defects in the subsequent steps can be suppressed, and reduction in the overall cost can be expected. In addition, even if a defective motor coil is generated, when the motor coil assembly stator is used, the motor coil assembly stator is disposed so that the defective motor coil is not adjacent to the defective motor coil, and therefore, the motor coil assembly stator can be used freely without causing any problem, and improvement in yield can be expected.
In addition, even when bubbles or cracks are present in the insulator layer 22, the defect can be detected. That is, when an ac voltage of a predetermined magnitude is applied, partial discharge is generated between the conductive liquid 7 wetting the wet electrode 8 and the magnet wire 2, and the electric charge is detected by the partial discharge detector P. The amount of discharge charge detected in the case where the insulator layer 22 has a defect such as a bubble or a crack is larger than in the case where the insulator layer has no defect. By using partial discharge in this way, even if the defect of the insulator layer 22 is not a through hole such as conduction, it can be detected.
If partial discharge occurs in the same portion for a long period of time, the insulator layer 22 may be degraded, but if the electrode width D1 is passed at the feed speed of a normal winding machine for a long period of time, the effect of degradation is hardly affected. That is, defects in the insulator layer 22 of the magnet wire 2 can be detected in a substantially nondestructive manner.
If the coil in which the defect position is determined by the defect detection device and the detection method according to the present embodiment is used, not only the quality can be improved but also the production cost can be expected to be reduced in the motor manufacturing.
For example, in the case of manufacturing a motor with a single-tooth core, by excluding only defective motor coils in advance, the cost of loss of the whole manufacturing can be suppressed as compared with the case where defects are found in the process after the whole stator is assembled. Even if there is a defect in the coil, the coil can be handled without being discarded as long as the position of the defect is specified by the detection device.
Fig. 8 is a view showing a stator in which teeth of a motor coil are arranged in a circle as viewed from the axial direction. In fig. 8, a rotor which is disposed opposite to the inner diameter side of the stator with a gap therebetween and is rotatable with respect to the stator is omitted. In the configuration shown on the left side of fig. 8, since the defect distance between the motor coils is short, there is a possibility that an electrical short circuit caused by discharge occurs at the time of energization. In contrast, if the teeth are replaced as shown on the right side of fig. 8 so that the positions of defects are not adjacent to each other, the stator can be used without discarding the teeth as compared with the prior art, and further improvement in yield can be expected.
Since the partial discharge is generated 2 times at most for 1 wavelength of the applied ac voltage, the frequency of generation of the partial discharge is 100 times every 1 second assuming that the frequency of the measurement voltage of the defect detecting device 200 is 50 Hz. That is, in order to inspect the defect of the whole area of the wound magnet wire 2 without omission, the distance advanced every 1 second as the winding speed must be set to 100 times or less (2 times or less of the frequency) of the area of the electrode width D1. When the electrode width D1 is 10mm, the winding speed needs to be 1000mm/sec or less. When the area of the electrode width D1 is further increased, the probability of detecting a defect increases, but at the same time, the portion where a defect exists is somewhere within the same range as the electrode width D1, and therefore, attention must be paid to a decrease in the position determination accuracy in the motor coil 5.
In fig. 5 and 6, the round wire type magnet wire is used as an example, but the wet electrode 8 is soft and thus can be applied to the flat angle type magnet wire shown in fig. 4. The wet electrode is exemplified by a felt material, but any material may be used as long as it is soft in the extent that it has water absorbability and can be closely adhered along the curved surface of the magnet wire used, for example, a sponge material such as a sponge may be used.
Examples of the conductive liquid 7 include volatile alcohols such as methanol and ethanol. The liquid other than alcohols may be used, but it is required to have high conductivity, low viscosity for penetrating into the pinhole or other defects of the magnet wire 2, and quick removal after passing through the measurement region of the electrode width D1.
The clamper 9 is used to press the wet electrode 8A and the wet electrode 8B against the magnet wire 2, but also has a function of suppressing evaporation of the conductive liquid 7 from the surfaces of the wet electrode 8A and the wet electrode 8B in the air. The material of the clamper 9 may be resin or metal, or a conductive metal material such as copper or iron may be used to exclude the metal electrode 10 as shown in fig. 9, and the power source V and the partial discharge detector P may be directly connected to the clamper 9, and a voltage may be applied to measure the same.
The conductive liquid tank 6 is made of an insulating material, and is made of a material insoluble in the conductive liquid 7. In the present embodiment, the case shape of a rectangular parallelepiped with an open upper surface has been described, but any of a cubic shape, a cylindrical shape, and a conical shape may be used as long as the conductive liquid 7 can be held. In order to suppress evaporation of the conductive liquid 7 from the liquid surface, the floating body may be floated, and a cover may be provided on the upper surface of the conductive liquid tank 6.
In the measurement of the magnet wire 2, the wet electrode 8 needs to be always wetted with the conductive liquid 7. When a voltage is applied to the wet electrode 8 via the metal electrode 10, both ends of the wet electrode 8 must always be positioned below the liquid surface of the conductive liquid 7. In order to maintain the liquid level, in addition to the floating body for suppressing evaporation, a liquid supply mechanism 300 for supplying the conductive liquid 7 to the conductive liquid tank 6 may be provided as shown in fig. 10.
In fig. 10, a liquid level switch 13 is provided in the conductive liquid tank 6. When the water level is lower than the predetermined lower limit water level, the valve 14 is opened, the conductive liquid 7 is supplied from the liquid supply tank 15 to the conductive liquid tank 6, and when the water level reaches the upper limit water level, the valve 14 is closed, and the supply of the conductive liquid 7 is stopped. Instead of an electrical level switch, a float level switch may also be used.
By bringing the wet electrode 8 into contact with the surface of the conductive liquid 7 supplied to the conductive liquid tank 6 and applying an ac voltage to the conductive liquid 7 or the wet electrode 8, the conductive liquid 7 can be stably and continuously supplied to the wet electrode 8, and the wet electrode 8 can be always wetted.
Embodiment 2.
The wet electrode 8 shown in fig. 2 is divided into two wet electrodes 8A and 8B and sandwiches the magnet wire 2, but may be shaped like the wet electrode 8C shown in fig. 11. Fig. 11 (a) shows a front view of the wet electrode 8C, and fig. 11 (b) shows a perspective view, but for ease of understanding, the clamp and the conductive liquid are removed.
The wet electrode 8C is formed by bending a long wet electrode having a rectangular parallelepiped shape with approximately twice the length of the wet electrode 8A or the wet electrode 8B shown in fig. 2 into a U shape at the upper part. Is formed to encase the magnet wire 2 at the curved portion. Thus, two portions extending from the bent portion of the U-shape are in contact as shown in fig. 11 (a). In addition, as long as the wet electrode 8C can be formed in the same shape, it is not necessary to form the electrode in a long shape of a rectangular parallelepiped.
According to the structure of the wet electrode 8C, a minute gap generated between the contact surface of the wet electrode 8A and the wet electrode 8B shown in fig. 2 and the upper and lower surfaces of the magnet wire 2 can be eliminated, and therefore, the conductive liquid 7 can be efficiently and more reliably brought into contact with the surface of the magnet wire 2.
Embodiment 3.
The wet electrode 8D shown in fig. 12 may be shaped. Fig. 12 (a) shows a front view of the wet electrode 8D, and fig. 12 (b) shows a perspective view, but for ease of understanding, the clamp and the conductive liquid are removed. The wet electrode 8D is formed by winding one long wet electrode having a length of about 2.5 to 3 times that of the wet electrode 8A or the wet electrode 8B shown in fig. 2 around the magnet wire 2 in a spiral shape, and immersing both ends thereof in the conductive liquid 7.
According to the structure of the wet electrode 8D, the minute gap generated between the contact surface of the wet electrode 8A and the wet electrode 8B shown in fig. 2 and the upper and lower surfaces of the magnet wire 2 can be eliminated over the entire circumference, and therefore, the conductive liquid 7 can be more reliably brought into contact with the surface of the magnet wire 2 than in embodiments 1 and 2.
In addition, regarding the winding method in which the wet electrode 8D is wound around the magnet wire 2, as long as the entire circumference of the magnet wire 2 is in contact with the wet electrode 8D, a gap may be present between adjacent wet electrodes as shown in fig. 12 (b). The number of windings may be two or more. However, as described in embodiment 1, when the number of windings is increased, the probability of detecting a defect increases, but the area of the electrode width D1 increases, and therefore, it is necessary to pay attention to a decrease in the accuracy of determining the position where a defect exists in the motor coil 5.
Embodiment 4.
The electromagnetic wire winding method of the present embodiment may be used not only in a motor coil winding form but also in a form wound around a bobbin as shown in fig. 13.
After passing through the defect detecting device 200, the magnet wire 2 is wound around the winding bobbin 17 via the traverse mechanism 16. The axial direction of the winding spool 17 is positioned perpendicular to the moving line of the magnet wire 2, and the spool is rotated by power transmission from the servo motor 18. Although the power transmission by the belt is shown in fig. 13, a chain or a gear may be used as the power transmission system as long as the mechanism rotates the shaft of the winding bobbin 17.
According to the present embodiment, the present application can be used not only for motor production but also for a purpose of grasping in advance, as a material receiving inspection, the frequency of occurrence of defects in an insulating film of the electromagnetic wire and the degree of distribution in a bobbin.
While various illustrative embodiments and examples have been described, the various features, aspects, and functions described in one or more embodiments are not limited to the application of the particular embodiments, and may be applied to the embodiments alone or in various combinations.
Accordingly, numerous modifications not illustrated can be envisaged within the scope of the technology disclosed in the present specification. For example, the case where at least one component is deformed, added or omitted, or the case where at least one component is extracted and combined with the components of the other embodiments is included.
Description of the reference numerals
1: a spool; 2: an electromagnetic wire; 3: a tensioner; 4: a nozzle; 5: a motor coil; 6: a conductive liquid tank; 7: a conductive liquid; 8. 8A, 8B, 8C, 8D: a wet electrode; 9: a clamp; 10: a metal electrode; 11: an iron core; 12: an insulator; 13: a liquid level switch; 14: a valve; 15: a liquid supply tank; 16: a traversing mechanism; 17: a winding spool; 18: a servo motor; 100: a coil winding device; 200: a defect detecting device; 300: a liquid supply mechanism; 1000: a processor; 2000: a storage device.
Claims (15)
1. A defect detecting device is characterized in that,
the defect detection device comprises: an electrode which is impregnated with a conductive liquid and is formed so that the conductive liquid contacts the periphery of the insulator layer of the electromagnetic wire; and a partial discharge detection device connected in parallel with the electrode, wherein the electrode applies an alternating voltage between the magnet wire and the conductive liquid, and the partial discharge detection device is used for measuring a discharge charge amount of partial discharge generated between the magnet wire and the conductive liquid, thereby detecting defects of an insulating coating of the magnet wire.
2. A defect detecting device is characterized in that,
the defect detection device comprises: an electrode which is impregnated with a conductive liquid and is formed so that the conductive liquid contacts the periphery of the insulator layer of the electromagnetic wire; and a partial discharge detection device connected in parallel with the electrode, wherein the defect detection device applies an alternating voltage between the magnet wire and the electrode, and detects a defect of the insulating film of the magnet wire by measuring a discharge charge amount of partial discharge generated between the magnet wire and the conductive liquid using the partial discharge detection device.
3. The defect detecting apparatus according to claim 1 or 2, wherein,
the electrode is formed such that the conductive liquid is in contact with the entire circumference of the insulator layer of the traveling magnet wire.
4. The defect detecting apparatus according to any one of claims 1 to 3, wherein,
the electrode is a wet electrode made of a soft and hygroscopic material.
5. The defect detecting apparatus of claim 4, wherein,
the electrode is in contact with the surface of the conductive liquid in the conductive liquid tank.
6. The defect detecting apparatus of claim 5, wherein,
the conductive liquid tank is provided with a liquid supply mechanism which is composed of a liquid level switch, a liquid supply tank for the conductive liquid and a valve.
7. The defect detecting apparatus according to any one of claims 1 to 6, wherein,
the electrodes are configured as two rectangular parallelepiped wet electrodes sandwiching the magnet wire.
8. The defect detecting apparatus according to any one of claims 1 to 6, wherein,
the electrode has a U-shape, and a bent portion for forming the U-shape is formed to be in contact with the periphery of the magnet wire.
9. The defect detecting apparatus according to any one of claims 1 to 6, wherein,
the electrode is spirally wound around the magnet wire.
10. The defect detecting apparatus according to any one of claims 1 to 8, wherein,
the defect detection device is provided with a clamp which clamps the electrode from the outer surface.
11. A defect detecting device, wherein,
the defect detection device comprises: a coil winding device which winds an electromagnetic wire into a motor coil; and the defect detecting device of any one of claims 1 to 10, which detects a defect of the magnet wire before winding the magnet wire into a motor coil in a coil winding device.
12. A defect detecting device, wherein,
the defect detection device comprises: a coil winding device which winds an electromagnetic wire into a motor coil; and the defect detecting device according to any one of claims 1 to 10, which is provided with a winding spool connected to a rotation power behind an electrode in the defect detecting device.
13. A defect detection system, characterized in that,
the defect detection system is provided with: a coil winding device which winds an electromagnetic wire into a motor coil; and the defect detection device according to any one of claims 1 to 10, wherein an encoder is disposed between an electrode in the defect detection device and the motor coil, the encoder detecting a speed of the magnet wire, and the defect detection system calculates a position of a defect of the magnet wire wound as the motor coil based on an output of the encoder and a defect detection signal output by the defect detection device.
14. A defect detection method is characterized in that,
a coil winding device for winding an electromagnetic wire into a motor coil, the defect detection device according to any one of claims 1 to 10, and an encoder for detecting a speed of the electromagnetic wire between an electrode in the defect detection device and the motor coil, wherein a position of a defect of the motor coil is calculated from a winding distance until the defect is detected and a winding distance after the defect is detected, with a distance from a winding start end of the motor coil as a zero point.
15. A method of manufacturing a rotary electric machine, wherein,
a rotary electric machine is manufactured using a motor coil that is defect-detected using a coil winding device that winds an electromagnetic wire into the motor coil and the defect detection device according to any one of claims 1 to 10.
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| JP2021-003909 | 2021-01-14 | ||
| JP2021003909 | 2021-01-14 | ||
| PCT/JP2021/047803 WO2022153821A1 (en) | 2021-01-14 | 2021-12-23 | Defect detection device, defect detection method, defect detection system, and method for manufacturing dynamo-electrical machine |
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| CN116660789B (en) * | 2023-06-25 | 2024-02-20 | 新疆天成鲁源电气工程有限公司 | Intelligent live detection device for cable |
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| JP2004347523A (en) * | 2003-05-23 | 2004-12-09 | Hitachi Ltd | Method for testing insulating property of coil |
| JP2006300532A (en) * | 2005-04-15 | 2006-11-02 | Toyota Motor Corp | Quality inspection method of coil and quality inspection device of coil |
| JP2009236887A (en) * | 2008-03-28 | 2009-10-15 | Furukawa Electric Co Ltd:The | Insulation fault detecting electrode structure and insulation fault detecting method |
| JP5949612B2 (en) * | 2013-03-21 | 2016-07-13 | 日立金属株式会社 | Insulation characteristic inspection device, insulation characteristic inspection method, and insulated wire manufacturing method |
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