JP2007121003A - Motor insulation inspection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor insulation inspection apparatus capable of accurately inspecting the insulation between coils and cases prior to being formed into motor assemblies. <P>SOLUTION: The motor insulation inspection apparatus 100 is provided with coil cover electrodes 41 and 42 having a recession part of a shape in simulation of the outside shape of a coil end of a coil 1. The recession part is opposed to the coil end. Either the coil cover electrode 41 or the coil cover electrode 42 is connected to a current sensor 6. A coil end of a body to be inspected 10 is covered with the coil cover electrodes 41 and 42 at insulation inspection, and an electric power supply part 5 applies an inspection voltage to the coil 1. An insulation inspection part 7 detects insulation defects between the coil and the coil cover electrodes on the basis of signals from a current detection sensor 6 when the inspection voltage is applied. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motor insulation inspection apparatus that inspects insulation of a motor coil. More specifically, the present invention relates to a motor insulation inspection device that inspects insulation between a coil and a case before a stator, a rotor, and a case are assembled to form a motor assembly.

  In recent years, hybrid vehicles, electric vehicles, etc. have attracted attention from the viewpoint of low pollution. Conventionally, since vehicle drive motors mounted on these vehicles require high-precision performance characteristics, various performance inspections have been performed on the components of the motors. In particular, the enamel portion on the surface is easily damaged by the impact of the machine or jig, mechanical pressure, friction, etc. during the coil mounting process and the molding process. Therefore, an inspection for detecting a defective insulation of the coil is performed.

  The vehicle drive motor is mounted on the vehicle as a motor assembly in which a stator, a rotor, and a case for housing them are assembled. In recent years, there has been a demand for a compact motor assembly, and parts constituting the motor are accommodated in the case with almost no gap. In this motor assembly, the space between the coil end of the coil wound around the stator and the case becomes narrower as the whole is made more compact. Therefore, the smaller the motor assembly, the shorter the distance between the coil and the case, and the insulation between the coil and the case becomes a problem.

  The coil-case insulation test cannot be performed directly before assembly of the case. Therefore, after assembling as a motor assembly, the motor assembly is inspected for insulation and the defective motor in which the insulation failure has occurred is removed.

  Conventionally, as an insulation test between a coil and a case, an inspection is performed by using the correlation between an insulation distance and a discharge start voltage and replacing the discharge start voltage with a distance. This inspection is performed by the following procedure, for example. First, as shown in FIG. 14, a gauge 90 having a concave portion 91 formed in accordance with the shape of the coil end is prepared. Then, as shown in FIG. 15, the evaluator matches the gauge 90 with the coil end 11 of the motor, and visually confirms whether the coil end 11 has a correct shape (dimension). That is, if the shape is defective, as shown in FIG. 16, the gauge 90 and the coil end 11 are in contact with each other, and further, the gauge 90 is caught by the coil end 11 and is not disposed at the correct position. In the inspection using this gauge, it is determined whether or not the call-case is insulated depending on whether or not the shape of the coil end is good.

  Moreover, as an inspection apparatus for inspecting the insulation of the coil, for example, there is a coil insulation inspection apparatus disclosed in Patent Document 1. In this inspection device, a probe pin having a shape that conforms to the outer shape of the coil end is prepared, and it is possible to detect an insulation failure of the coil and to identify an abnormal portion.

JP 2005-121442 A

  However, the conventional coil-case insulation test described above has the following problems. That is, since the motor assembly is stored in a limited place in the vehicle, the shape of the case is complicated. In addition, since the coil end is formed of a soft member, it is difficult to manage the final shape in the manufacturing process. For these reasons, the shape of the coil end is not uniform in the circumferential direction of the stator. Furthermore, the coil end of the motor includes not only the coil but also insulating paper and lacing yarn. Therefore, the insulation quality cannot be accurately measured with only one gauge.

  For this reason, in the insulation inspection using the gauge 90 shown in FIG. 14, 6 to 8 types of gauges are prepared, and the inspector selects an appropriate gauge according to the circumferential position of the coil end. However, it takes time to switch gauges, and skill of the inspector is required to select an appropriate gauge. Moreover, since the inspection is performed manually, it cannot be denied that the inspection results vary.

  Even the coil insulation inspection apparatus of Patent Document 1 cannot cope with a coil end having a complicated shape with only one probe pin, and cannot accurately measure insulation quality. Moreover, the coil insulation test | inspection apparatus of patent document 1 extracts the pinhole of a coil, and does not test | inspect the insulation between coils and cases.

  After the motor assembly, the coil end of the coil wound around the stator is fixed with a varnish or the like and further integrated with the case. Therefore, after the motor assembly, even if an insulation failure is detected, the defective motor cannot be repaired.

  The present invention has been made to solve the above-described problems of the prior art. That is, an object of the present invention is to provide a motor insulation inspection device capable of accurately inspecting insulation between a coil and a case before making a motor assembly.

  A motor insulation inspection apparatus designed to solve this problem is a motor insulation inspection apparatus that inspects insulation of a coil of a subject using a stator around which a coil is wound. A power supply unit for applying a predetermined voltage, a recess imitating the outer shape of the coil end of the subject, a coil cover electrode disposed opposite to the coil end of the subject, and a current flowing through the coil cover electrode And an insulation failure detection unit that determines insulation of the coil of the subject based on the detected current.

  In the motor insulation inspection apparatus of the present invention, the coil of the subject and the power supply unit are electrically connected. Further, a coil cover electrode having a recess imitating the outer shape of the coil end of the subject is provided, and the recess of the coil cover electrode and the coil end of the subject are arranged to face each other. That is, the coil end of the subject is covered in a non-contact manner by the coil cover electrode.

  The insulation failure detection unit detects the discharge current flowing between the coil cover electrode and the coil end when the inspection voltage is applied by the power supply unit. The insulation failure detection unit determines whether the shape of the coil end is good or not based on whether a current of a predetermined value or more is detected. If the shape of the coil end is good, the distance between the coil end and the case is secured, and it can be determined that the insulation between the coil and the case is good. That is, the insulation between the coil and the case can be determined by inspecting the insulation between the coil and the coil cover electrode.

  The motor insulation inspection apparatus of the present invention covers the entire coil end with a coil cover electrode that follows the shape of the coil end. That is, since the entire circumferential direction of the coil end can be inspected by one coil cover electrode, there is no need to replace the inspection jig. As a result, inspection with an incorrect inspection jig is not performed. Therefore, an accurate inspection can be performed as compared with the conventional inspection.

  Further, the motor insulation inspection apparatus of the present invention uses a single stator around which a coil is wound as a subject. That is, the motor before the stator and the rotor are accommodated in the case is the subject. Therefore, it is possible to repair the motor in which the insulation failure is detected.

  Moreover, the coil cover electrode of the motor insulation inspection apparatus of the present invention has a structure divided into a plurality of blocks in the circumferential direction, the blocks are insulated from each other, and the insulation failure detection unit is a block of the coil cover electrode. It is better to detect the current every time. By dividing the coil cover electrode into a plurality of blocks in this manner, the discharge current can be detected for each of the divided blocks. Therefore, it is possible to specify the region where the discharge current is generated in the circumferential region of the coil end, and to obtain a more detailed inspection result.

  Further, the coil cover electrode of the motor insulation inspection apparatus of the present invention has a rotor electrode simulating the shape of a rotor inserted into the stator of the subject, and the coil cover electrode is located in a region radially inward of the recess. It is better to provide a convex portion, the end portion of the convex portion and the end portion of the rotor electrode are integrated with an insulator interposed therebetween, and the insulation failure detection unit detects the current flowing through the rotor electrode.

  Since the rotor electrode is integrated with the convex portion arranged inside the concave portion of the coil cover electrode, the rotor electrode can be arranged opposite to the inside of the coil end in accordance with the positioning of the coil cover electrode and the coil end. it can. In this state, the insulation between the rotor electrode and the coil end can be inspected by applying an inspection voltage to the coil of the subject. Since this rotor electrode simulates a rotor, the insulation inspection between the rotor electrode and the coil end corresponds to the insulation inspection between the rotor and the coil. Therefore, the insulation inspection between the coil and the rotor can be performed before the motor assembly.

  Further, in the motor insulation inspection apparatus, it is better to electrically connect the stator of the subject and the rotor electrode when detecting the current flowing through the coil cover electrode. This suppresses the occurrence of discharge between the stator and the rotor electrode during the insulation test between the coil and the coil cover electrode (between the coil and the case). Therefore, a more accurate insulation inspection can be performed.

  According to the present invention, the insulation between the coil and the case is determined by inspecting the insulation between the coil end and the coil cover electrode using the motor in a state before the motor assembly as the subject. Therefore, a motor insulation inspection device capable of accurately inspecting insulation between the coil and the case before the motor assembly is realized.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the accompanying drawings. In the present embodiment, the present invention is applied to a motor insulation inspection device for a vehicle driving motor mounted on a hybrid vehicle, an electric vehicle or the like.

  First, the configuration of the vehicle drive motor will be briefly described. As shown in FIG. 1, the vehicle drive motor includes a stator 2 that forms a rotating magnetic field and a rotor 3 that rotates inside the stator 2. In the motor for driving a vehicle, a coil 1 is wound around a stator 2, and a coil end of the coil 1 is formed into a predetermined shape.

  As shown in FIG. 2, the stator 2 has a stator core 22 formed by laminating an annular plate-like magnetic steel plate 21. A plurality of slots 23 into which the coils 1 are inserted are formed in the inner periphery of each magnetic steel plate 21. The stator 2 is formed by inserting coils of U, V, and W phases into the slots 23 of the stator core 22.

  On the other hand, as shown in FIG. 3, the rotor 3 includes a rotor shaft 31, a rotor core 32 in which permanent magnets are arranged at predetermined intervals on the outer periphery of the rotor shaft 31, and magnetic steel plates are laminated. An end plate 33 made of aluminum is disposed at both ends in the axial direction, and a bearing 35 is disposed at both ends of the rotor shaft 31. Insulation between the coil end and the end plate 33 is a problem mainly between the coil and the rotor.

  Further, the rotor 3 shown in FIG. 3 is arranged inside the stator 2 shown in FIG. 2 and further casinged by the case 4, thereby forming a motor assembly 40 as shown in FIG. In the motor assembly 40, the stator 2, the rotor 3, and the case 4 are electrically connected.

  Next, the motor insulation inspection device will be described. In the inspection of the present embodiment, the specimen 10 is a stator before the motor assembly and after the coil is wound and the coil end is formed into a predetermined shape.

[First embodiment]
As shown in FIG. 5, the motor insulation inspection apparatus 100 according to the first embodiment includes a pair of power supply units 5 that control power supply to the coil 1 of the subject 10 and a pair of the subject 10 that are opposed to each other with the subject 10 interposed therebetween. The coil cover electrodes 41 and 42, a current detection sensor 6 for detecting a discharge current, a signal from the current detection sensor 6 and an insulation inspection unit 7 for determining the presence or absence of insulation failure, and a chamber for housing the subject 10 8.

  The coil cover electrodes 41 and 42 are arranged so as to cover the coil end of the coil 1 of the subject 10 at the time of an insulation test, and are provided so as to be movable in the vertical direction. Further, as shown in FIG. 6, the coil cover electrodes 41 and 42 are formed with a concave portion that follows the shape of the coil end. Specifically, the coil cover electrode 41 is formed with a recess 411 that follows the shape of the coil end on the side from which the lead wire is drawn (hereinafter referred to as “lead side”). Is formed with a recess 421 following the shape of the coil end on the side from which the lead wire is not drawn (hereinafter referred to as “anti-lead side”).

  Then, when the coil cover electrodes 41 and 42 move toward the coil end and reach the stator 2, the coil ends are covered with the coil cover electrodes 41 and 42 as shown in FIG. Note that these recesses do not completely coincide with the outer shape of the coil end, and are slightly wider than the coil end. That is, when a coil end having a normal shape is covered, an appropriate distance is secured so that no discharge is generated with respect to the coil end. Therefore, the coil cover electrodes 41 and 42 cover the coil end of the subject 10 in a non-contact manner.

  Further, an insulating plate 412 is bonded to the surface layer of the coil cover electrode 41 as shown in FIG. An insulating plate 422 is also bonded to the surface layer of the coil cover electrode 42. Therefore, when the coil end is covered (see FIG. 7), the coil cover electrodes 41 and 42 are in contact with the stator 2 via the insulating plates 412 and 422, and the stator 2 and the coil cover electrodes 41 and 42 are insulated. Is done.

  In addition, since the coil end on the lead side and the coil end on the opposite lead side are not necessarily symmetrical, the concave portion 411 of the coil cover electrode 41 and the concave portion 421 of the coil cover electrode 42 are not necessarily symmetrical. Further, the shape of the coil end is not uniform in the circumferential direction of the stator. That is, the shape of the coil end is a shape that matches the installation space in the vehicle, and the cross section differs for each region in the circumferential direction (for example, for each slot of the stator 2). For example, as shown in FIG. 8, the shape of the coil end 11 on the lead side is distinguished into three areas in the circumferential direction. In such a case, the shape of the coil end 11 differs between the AA cross section (FIG. 9) and the BB cross section (FIG. 10) of the stator 2 in FIG. Accordingly, the concave portion 411 of the coil cover electrode 41 is also formed in accordance with the coil end 11, so that the shape thereof differs in the circumferential direction.

  In the motor insulation inspection apparatus 100, as shown in FIG. 5, a current sensor 6 for detecting a discharge current is electrically connected to one of the coil cover electrodes 41 and. The signal output from the current detection sensor 6 is sent to the insulation inspection unit 7. After the inspection with one coil cover electrode is completed, the current detection sensor 6 is connected to the other coil cover electrode and the same inspection is performed.

  The power supply unit 5 is electrically connected to the coil 1 of the subject 10. A predetermined inspection voltage (for example, 2 kV, 60 Hz sine wave) is applied to the coil 1 by the power supply unit 5. The inspector can select any one of the U-phase, V-phase, and W-phase by using a switching box or the like, and an inspection voltage is applied to the selected coil.

  The insulation inspection unit 7 determines whether or not a discharge current is detected by the current detection sensor 6 based on a signal obtained from the current detection sensor 6 by applying an inspection voltage to the coil 1. That is, an insulation failure between the coil and the coil cover electrode is detected. At this time, if it is normal, the current detection sensor 6 does not detect a current exceeding the threshold value. That is, no discharge current is detected. On the other hand, if the insulation is defective, the current detection sensor 6 detects a current equal to or greater than the threshold value. Thereby, the quality of the insulation between a coil-coil cover electrode can be judged. The inspection result is output to output means such as a monitor or a printer attached to the insulation inspection unit 7. The inspector can know the test result through a monitor, for example.

  Specifically, the concave portions of the coil cover electrodes 41 and 42 have a shape imitating the shape of the coil end. From this, when an insulation failure occurs between the coil and the coil cover electrode, it can be determined that the shape of the coil end is defective. If the shape of the coil end is defective, the safety distance between the coil end and the case cannot be secured. Therefore, insulation failure occurs between the coil and case when the motor assembly is used. Therefore, the insulation between the coil and the case can be determined by inspecting the insulation between the coil and the coil cover electrode.

  As described above in detail, in the motor insulation inspection apparatus 100 according to the first embodiment, the coil cover electrodes 41 and 42 having the concave portions simulating the outer shape of the coil end are provided. The concave portion 411 of the coil cover electrode 41 is disposed opposite to the coil end on the lead side, and the concave portion 421 of the coil cover electrode 42 is disposed opposite to the coil end on the opposite lead side. In addition, the coil 1 is connected to the electrode supply unit 5, one of the coil cover electrodes 41 and 42 is connected to the current detection sensor 6, and an inspection voltage is applied to the coil 1 to flow between the coil and the coil cover electrode. The discharge current is detected.

  And the insulation test | inspection part 7 judges whether the electric current beyond a predetermined value was detected. Since the concave portions of the coil cover electrodes 41 and 42 simulate the shape of the coil end, the quality of the coil end can be determined by this current determination. Furthermore, the insulation between the coil and the case can be determined based on the shape of the coil end.

  Further, in the motor insulation inspection apparatus 100, since the entire circumferential direction of the coil end can be inspected by the pair of coil cover electrodes, the inspection jig is not replaced. As a result, inspection with an incorrect inspection jig is not performed. Therefore, an accurate inspection can be performed as compared with the conventional inspection.

  In addition, the motor insulation inspection apparatus 100 uses the motor before the motor assembly as the subject. That is, a single stator 2 around which the coil 1 is wound is used as a subject. For this reason, even when a poor insulation between the coil and the case is detected, the motor can be repaired. Therefore, a motor insulation inspection device that detects an insulation failure of the coil before the motor assembly and identifies a portion where the insulation failure occurs is realized.

[Second form]
As shown in FIG. 11, the motor insulation inspection apparatus according to the second embodiment has coil cover electrodes 43 and 44 divided into a plurality of blocks. Specifically, the coil cover electrode 43 is divided into five blocks 431, 432, 433, 434, and 435, and each block is insulated from each other by an insulating layer 430. Each block is provided with a terminal for electrical connection with the current detection sensor 6. The coil cover electrode 44 is also divided into a plurality of blocks, and each block is insulated from each other by an insulating layer 440. Other configurations are the same as those in the first embodiment.

  In the motor insulation inspection apparatus of this embodiment, the current detection sensor 6 is connected to each divided block, and the discharge current is detected for each block. That is, while switching the connection between the block of the coil cover electrodes 43 and 44 and the current detection sensor 6, an inspection voltage is applied each time to check the presence or absence of a discharge current. As a result, the insulation between the coil and the case can be inspected for each block. Therefore, it is possible to detect in more detail the location where the insulation failure has occurred in the circumferential direction of the coil end.

[Third embodiment]
As shown in FIG. 12, the motor insulation inspection apparatus according to the third embodiment has a coil cover electrode 46 having a recess 461 simulating the outer shape of the coil end, and is surrounded by the recess 461 of the coil cover electrode 46. In addition, a rotor electrode 45 simulating a rotor end plate (see the end plate 33 in FIG. 3) is provided at the center. Since the rotor electrode 45 is connected to the coil cover electrode 46 via the insulating plate 463, the rotor electrode 45 and the coil cover electrode 46 are insulated.

  The coil cover electrode 46 is thicker at the inner portion of the recess 461 where the rotor electrode 45 is located than at the outer portion of the recess 461. That is, the central portion of the coil cover electrode 46 forms a convex portion 462. The rotor electrode 45 is integrated with the convex portion 462 of the coil cover electrode 46 and protrudes from the central portion of the coil cover electrode 46. Therefore, when the coil cover electrode 46 is in contact with the stator 2, that is, when the coil cover electrode 46 covers the coil end, the rotor electrode 45 moves to a position surrounded by the stator 2 as shown in FIG. The coil cover electrode located on the opposite lead side has the same configuration. Other configurations are the same as those in the first embodiment.

  In the motor insulation inspection apparatus of this embodiment, first, the rotor electrode 45 and the current detection sensor 6 are electrically connected. Next, as shown in FIG. 12, the coil cover electrode 46 is moved to a position where the rotor electrode 45 is surrounded by the coil end of the coil 1. That is, the rotor electrode 45 is moved to a position where the end plate is disposed when the rotor is actually inserted into the stator. Thereby, the space between the coil and the rotor (end plate) can be simulated. In this state, an inspection voltage is applied to the coil 1 by the power supply unit 5. Thereby, an insulation failure between the coil end and the rotor electrode 45 can be detected. That is, the insulation failure between the coil and the rotor can be detected.

  During the insulation inspection between the coil and the rotor, the recess 461 of the coil cover electrode 46 is separated from the coil end of the coil 1. That is, since the rotor electrode 45 is located at the tip of the convex portion 462 of the coil cover electrode 46, when the rotor electrode 45 is opposed to the coil end, the coil cover electrode 46 is not opposed to the coil end. For this reason, no discharge occurs between the coil and the coil cover electrode during the insulation inspection between the coil and the rotor. Therefore, the insulation between the coil and the rotor can be accurately inspected.

  Next, the coil cover electrode 46 and the current detection sensor 6 are electrically connected. Next, as shown in FIG. 13, the coil cover electrode 46 is moved until it reaches the stator 2. As a result, the rotor electrode 45 moves to the inside of the stator 2 and the recess 461 of the coil cover electrode 46 faces the coil end.

  Further, the stator 2 and the rotor electrode 45 are electrically connected, and in this state, an inspection voltage is applied to the coil 1 by the power supply unit 5. Normally, when an inspection voltage is applied to the coil 1, the potential of the stator 2 is also induced and increased under the influence of the inspection voltage. Therefore, if the insulation inspection is continued without electrically connecting the stator 2 and the rotor electrode 45, a discharge is generated between the stator 2 and the rotor electrode 45, and the coil 1 and the coil cover electrode 46 are not connected. Insulation cannot be accurately inspected. Therefore, during the insulation inspection between the coil and the case, the stator 2 and the rotor electrode 45 are electrically connected, and the stator 2 and the rotor electrode 45 are set to the same potential, thereby suppressing the discharge between the stator and the rotor electrode. . As a result, the coil-case insulation can be inspected more accurately.

  As described above in detail, in the motor insulation inspection apparatus of the third embodiment, the coil cover electrode 46 is provided with the convex portion 462, and the rotor electrode 45 imitating the end plate of the rotor is attached to the tip portion of the convex portion 462. I am going to do that. The insulation between the coil and the rotor can be inspected by moving the rotor electrode 45 to a position where the end plate of the rotor is disposed. Further, by moving the coil cover electrode 46 to the stator 2 side and causing the concave portion 461 of the coil cover electrode 46 and the coil end to face each other, the insulation between the coil and the case can be inspected. Therefore, before the motor assembly, the insulation between the coil and the case and the insulation between the coil and the rotor can be inspected.

  In addition, at the time of the insulation inspection between the coil and the case, the stator 2 and the rotor electrode 45 are electrically connected. As a result, the stator 2 and the rotor electrode 45 have the same potential, and the discharge between the stator and the rotor electrode can be suppressed. Therefore, the insulation between the coil and the case can be inspected more accurately.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, in this embodiment, since there is one current detection sensor, it is necessary to switch the connection with the current detection sensor for each coil cover electrode (or for each block), but a plurality of current detection sensors are provided. In the case where a plurality of coil cover electrodes (or blocks thereof) are present, an insulation failure can be detected by applying a single inspection voltage.

  In this embodiment, the vehicle drive motor is inspected, but the present invention is not limited to this. That is, you may apply this invention to the test | inspection of the motor for household appliances.

It is a figure which shows schematic structure of the vehicle drive motor. It is a figure which shows schematic structure of a stator. It is a figure which shows schematic structure of a rotor. It is a figure which shows schematic structure of a motor assembly. It is the schematic which shows schematic structure of the motor insulation test | inspection apparatus concerning a 1st form. It is the schematic (at the time of electrode separation) which shows the external appearance structure of a coil cover electrode. It is the schematic (at the time of an insulation test) which shows the external appearance structure of a coil cover electrode. It is the schematic which shows the state which looked at the coil end from the up-down direction of the stator. It is an AA cross section of Drawing 8, and is a figure showing the state where the coil cover electrode is arranged. It is a BB section of Drawing 8, and is a figure showing the state where the coil cover electrode has been arranged. It is the schematic which shows the coil cover electrode of the motor insulation test | inspection apparatus concerning a 2nd form. It is the schematic (at the time of the insulation test between coil-rotors) which shows the coil cover electrode of the motor insulation test apparatus concerning a 3rd form. It is the schematic (at the time of the insulation test between coil-coil cover electrodes) which shows the coil cover electrode of the motor insulation test apparatus concerning a 3rd form. It is a figure which shows the outline | summary of the gauge concerning the conventional insulation test | inspection method. It is a figure which shows the combination of the gauge concerning the conventional insulation test | inspection method, and a coil end. It is a figure which shows the outline | summary of the shape defect concerning the conventional insulation test | inspection method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil 2 Stator 3 Rotor 4 Case 40 Motor assembly 41 Coil cover electrode 411 Recessed part 412 Insulating plate 42 Coil cover electrode 421 Recessed part 422 Insulating plate 45 Rotor electrode 46 Coil cover electrode 461 Recessed part 462 Convex part 5 Power supply part 6 Current detection sensor (insulation) Defect detection unit)
7 Insulation inspection section (insulation defect detection section)
10 Subject 100 Motor insulation inspection device

Claims (4)

In a motor insulation inspection apparatus that uses a stator around which a coil is wound as an object and inspects the insulation of the coil of the object.
A power supply unit for applying a predetermined voltage to the coil of the subject;
A coil cover electrode provided with a recess imitating the outer shape of the coil end of the subject, the recess facing the coil end of the subject;
A motor insulation inspection apparatus comprising: an insulation failure detection unit that detects a current flowing through the coil cover electrode and determines insulation of a coil of a subject based on the detected current. In the motor insulation inspection apparatus according to claim 1,
The coil cover electrode has a structure divided into a plurality of blocks in the circumferential direction, and each block is insulated from each other,
The motor insulation inspection apparatus, wherein the insulation failure detection unit detects a current for each block of the coil cover electrode. In the motor insulation inspection apparatus according to claim 1 or 2,
A rotor electrode simulating the shape of a rotor inserted into the stator of the subject;
The coil cover electrode has a convex portion in a radially inner region from the concave portion, and an end portion of the convex portion and an end portion of the rotor electrode are integrated with an insulator interposed therebetween,
The motor insulation inspection device, wherein the insulation failure detection unit detects a current flowing through the rotor electrode. In the motor insulation inspection apparatus according to claim 3,
A motor insulation inspection apparatus characterized in that, when detecting a current flowing through the coil cover electrode, the stator of the subject and the rotor electrode are electrically connected.

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