JP2022034362A - Detachment inspection method for segment coil and peeling inspection device used therefor - Google Patents

Abstract

To grasp the amount of peeling of a peeled portion at the end of each segment coil to be joined to prevent the occurrence of joining failure due to poor peeling before joining the segment coils of a motor stator.SOLUTION: A peeling inspection device 100 of a segment coil 54 includes mounting means 110 that rotatably mounts a motor stator 50 in which a segment coil is housed, and an inspection unit 120 located away from this mounting means. The inspection unit includes a length measuring probe 380 that can move in the axial direction of the motor stator, and a first conduction probe 412 and a second conduction probe 414 for conduction detection, which are located apart from the length measuring probe and can move in the axial direction of the motor stator. The first conduction probe is rotatable around the end of the segment coil.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method and an apparatus for inspecting a peeled state of an insulating coating of a segment coil in a motor stator in which a plurality of segment coils are housed in a stator core, and is particularly suitable for use in a mass-produced motor. The present invention relates to a peeling inspection method and a peeling inspection device.

In the manufacture of a motor consisting of a stator and a rotor, multiple rows in the stator core and a large number of segment coils in the circumferential direction are arranged in the stator core, and each segment coil is connected to an adjacent segment coil at one end to form a single phase. It constitutes a three-phase or multi-phase motor. The segment coils are housed in slots provided on the inner surface of the stator core or fixedly arranged at approximately equal intervals in the circumferential direction by other means.

After the segment coil is fixedly arranged in the stator core in the previous step, one end side of the segment coil is connected to another segment coil by laser welding or the like to form a coil constituting one phase of the stator. When laser welding is performed, the welded end of the segment coil must be stripped of the insulating coating applied to the entire segment coil, and laser processing (for example, Japanese Patent Application Laid-Open No. 2000-23428) or The insulating coating is peeled off by cutting work (for example, Japanese Patent Application Laid-Open No. 2012-257442).

By the way, if the length of the peeled portion, which is the end portion for welding the segment coil, is out of the predetermined dimension, there is a possibility that the insulating coating is melted by the welding heat and welded to the adjacent segment coil during welding. rice field. Further, this may change the posture of the segment coil in the stator core, which may cause a problem in the subsequent assembly work of the motor. Further, in some cases, adjacent segment coils may come into contact with each other, causing a short circuit, and as a result, there is a possibility that a predetermined motor performance cannot be obtained.
Therefore, in the past, defective products were extracted by visually inspecting the peeled state of the insulating coating at the welded end of the segment coil or by performing a continuity inspection or the like after finishing the manufacture of the stator.

Patent Document 1 discloses an apparatus for inspecting a stator with high accuracy at a place away from the stator core. In this publication, in an insulation-coated conductor inspection method for inspecting the electrical insulation characteristics of an insulation-coated conductor in a coil formed by winding an insulation-coated conductor, the coil is placed in a test container, the inside of the test container is depressurized, and the coil and the coil are used. After providing a gap between the two to face the electrodes, an AC voltage is applied between the electrodes and the coil. The frequency of occurrence of discharge generated between the coil and the electrode is measured, and if the frequency of occurrence is equal to or higher than the standard frequency of occurrence, it is judged as a non-defective product.

Further, in Patent Document 2, in order to improve the bonding strength between the segment coils of the rotating electricity, the peeling portion at the end of the segment coil is bonded to the peeling portion of the other segment coil, and the other segment coil is used. It is described that a cushioning recess is provided on the joint surface facing the peeled portion.

Further, Patent Document 3 discloses that the generation of film residue at the film peeling portion of the unit coil is suppressed, the occurrence of welding defects and the increase of electrical resistance are suppressed. Specifically, at least the insulating coating formed on the pair of facing side surfaces is cut off to form a pair of cut surfaces on a part of the conductor wire having a rectangular cross section forming a plurality of unit coils, and the pair of cut surfaces are cut. One is pressed to plastically deform the conductor portion, and the other of the cut surfaces is used as a flat surface continuous with the surface of the insulating film to form a pair of facing surfaces of the film peeling portion. Then, the other pair of facing surfaces is cut off to form another facing surface of the film peeling portion on a part of the conductor wire.

Japanese Unexamined Patent Publication No. 2010-8124 Japanese Unexamined Patent Publication No. 2019-118214 Japanese Unexamined Patent Publication No. 2019-22134

For example, in the case of a motor stator in which 24 coil joints are arranged in the circumferential direction and segment coils are arranged in 3 layers in the radial direction, there are a total of 72 coil joint points, and it is an inspector to visually monitor these joint points. Will impose a great deal of effort on. In particular, when the motor is a mass-produced product, the motor stator is continuously carried to the inspection place, so that it is required to shorten the inspection time as the inspection amount increases. Therefore, in the past, instead of visual inspection, defective products were extracted by conducting continuity and insulation inspections after the joining of all segment coils was completed. In the case of such an inspection method, even if joining defects continue to occur at the same position due to the inconvenience of the peeling device, there is a possibility that they cannot be dealt with until after a large number of defective products have been produced.

On the other hand, the method for inspecting an insulating coated body described in Patent Document 1 has an advantage that it becomes easy to detect an insulation defect not only at a joint but also at the entire coil. However, in this method, not only the device becomes large-scale, but also the peeling state specified only at the joint point cannot be detected, so that the quality of the peeling of the insulating film at the joint point itself cannot be detected. Detecting peeling defects at the joint point at an early stage and feeding the results back to the previous process to prevent segment coil posture defects caused by welding defects during laser welding improves motor manufacturing throughput. However, this point is not disclosed in Patent Document 1.

Patent Document 2 describes that after peeling off the insulating coating of the joint portion of the segment coil, a buffer recess is provided in the peeled portion and the end portion is laser welded to reduce the stress intensity factor of the joint portion. .. However, this publication also does not disclose that the amount of peeling of the insulating coating is made appropriate to prevent the occurrence of poor posture and short circuit of the segment coil due to welding defects during laser welding.

Further, in Patent Document 3, the portion corresponding to the end portion of the segment coil having a rectangular cross section is cut or deleted on both sides with a punch to remove the insulating coating and thinned, and the thinned portion is plastically deformed to one side to form the surface. It is described that the peeling portion is formed by setting the peeling portion to the surface position, the sides of the peeling portion are placed back to back, and then the end face is laser welded. In this publication, it is true that the segment coils are back-to-back without gaps, so it is considered that there is no risk of springback occurring after laser welding and the welded portion peeling off. However, even in this method, there is no disclosure about peeling defects that may occur when cutting with a punch.

The present invention has been made in view of the above-mentioned defects of the prior art, and an object of the present invention is to grasp the peeling amount of the peeled portion at the end of the segment coil before joining the segment coil of the motor stator, and to perform peeling failure. The purpose is to prevent the occurrence of joint defects in the next step due to the above. Another object of the present invention is to establish an inspection method suitable for mass production for the above object.

A feature of the present invention that achieves the above object is that in a method for inspecting a motor stator in which a segment coil is housed in a stator core, after the segment coil is wound around the stator core, a peeling portion that is a joint end portion between the segment coils is peeled off. The purpose is to detect whether or not the length is within a predetermined length range before joining.

In this feature, a step of first measuring the end position of each segment coil and a step of detecting the conduction state of the segment coil at the first position separated from the end position of the segment coil by a first predetermined distance. And, it is desirable to include a step of detecting the conduction state of the segment coil at a second position separated from the end position of the segment coil by a second predetermined distance, and for all the segment coils to be joined. If continuity is confirmed at the first position and insulation is confirmed at the second position, it is judged as a non-defective product and the manufacturing of the next process is proceeded, and other than that, it is judged as a defective product and fed back to the previous process. It is even more desirable to discontinue production.

Another feature of the present invention that achieves the above object is a segment including a mounting means for rotatably mounting a motor stator in which a segment coil is housed, and an inspection unit arranged apart from the mounting means. In the coil peeling inspection device, the inspection unit is arranged apart from the length measuring probe that can move in the axial direction of the motor stator and the length measuring probe, and detects continuity that can move in the axial direction of the motor stator. A first conduction probe for use and a second conduction probe are provided.

In this feature, when the continuity of the segment coil is detected, the first conduction probe for conduction detection is the end portion of the segment coil and can abut on the side surface portion, and the second conduction probe for conduction detection can be brought into contact with the side surface portion. It is desirable to dispose the first conduction probe and the second conduction probe so that the continuity probe can come into contact with the end face of the segment coil to be inspected.

Further, the length measuring probe is connected to a first actuator that drives the length measuring probe in the axial direction of the stator, and the first conduction probe and the second conduction probe are the first of these. The conduction probe, the second actuator for driving the second conduction probe in the axial direction of the stator, and the control means for controlling the drive amount of the second actuator are connected, and the control means is connected to the first. The conduction probe 1 is driven and controlled from the end face of the segment coil to the first position and the second position on the inner side in the axial direction by using the second actuator, and the first conduction probe is controlled by the segment. It is desirable to provide a rotating means that allows rotation around the end of the coil. Further, it is particularly desirable that the first position is the peeling portion detection position of the segment coil and the second position is the insulating portion detection position of the segment coil.

According to the present invention, before joining the segment coils constituting the motor stator, it is determined whether or not the peeling length of the peeling portion, which is the joining end of the segment coil, has a predetermined length. It is possible to prevent the occurrence of joint defects due to defects. In addition, since a detection means that can be automated is provided instead of manual operation such as visual inspection, an inspection method suitable for mass production can be established.

It is a schematic perspective view of the main part of the example of the peeling inspection apparatus of the segment coil which concerns on this invention. It is a figure of the inspection part included in the peeling inspection apparatus shown in FIG. 1, (a) is a front view, (b) is a side view. It is a perspective view for demonstrating the operation of the peeling inspection apparatus shown in FIG. .. 3 is a partially enlarged view, where FIG. 3A is a view showing a measurement state using a length measuring probe, FIG. 3B is a diagram showing an inspection state using a conduction probe, and FIG. 3C is a partial top view of a segment coil. .. It is a figure of one Example of the rotating part of the conduction probe which concerns on this invention, (a) is a perspective view, (b) is a front view, (c) is a side view. It is a flowchart explaining one embodiment of the peeling inspection method of the segment coil which concerns on this invention. It is a flowchart explaining another embodiment of the peeling inspection method of the segment coil which concerns on this invention.

Hereinafter, an embodiment of a peeling inspection method for a segment coil according to the present invention and a peeling inspection device used therefor will be described with reference to the drawings. FIG. 1 is a perspective view of a main part of the segment coil peeling inspection device 100 according to the present invention. The peeling inspection device 100 is used in a line processing or batch processing process, and is suitable for mass-produced products.

In a general-purpose motor, in order to form a motor stator 50, a segment coil 54 is wound in a slot formed in the stator core 52, and the ends of the wound segment coil 54 are joined by laser welding or the like to form one coil. To form. In order to perform laser welding, a part of the insulating coating originally formed on the segment coil 54 is peeled off to form a peeled portion 62 (see FIG. 4).

The segment coil peeling inspection device 100 inspects whether or not the welded portion of the segment coil 54 built in the stator core 52 is properly formed before welding. The peeling inspection device 100 is roughly divided into a mounting means 110 and an inspection unit 120. The mounting means 110 mounts the motor stator 50 to be inspected and assists the inspection unit 120 in positioning the position to be inspected of the segment coil. On the other hand, the inspection unit 120 includes a measuring tool and an inspection instrument for inspecting the peeling state of the peeling portion 62 formed at each end of a large number of segment coils 54 included in the motor stator 50.

A motor stator 50 having a segment coil 54 to be joined is conveyed to a stator fitting shaft (simulated rotor) 222 formed on the vertical axis by a robot or the like (not shown), and then fitted. The mounting means 110 includes a work peripheral direction positioning cylinder 230. The positioning block 232 attached to the tip of the cylinder 230 is inserted into the reference position 50a in the circumferential direction of the motor stator 50 to secure the absolute position of the segment coil 54 being inspected.

A toothed pulley 218 is attached to the lower end of the stator fitting shaft 222, and is toothed with the toothed pulley 214 attached to the shaft end of the stepping motor 212 that rotationally drives the stator fitting shaft 222. They are connected via a belt 216. The stepping motor 212 is used to rotate the motor stator 50 around the stator fitting shaft 222 by a constant angle.

The inspection unit 120 includes a length measuring probe 380, which is a characteristic configuration of the present invention, and a plurality of conduction probes 412 and 414. In order to position these two types of probes 380, 421, and 414, the inspection unit 120 has a linear motion mechanism in two orthogonal axes, that is, a linear motion mechanism 310 in the horizontal direction (Y direction) and a vertical direction (Z direction). The linear motion mechanism 330 is provided. The first Z-axis linear motion mechanism 330 is attached to the Y-axis linear motion mechanism 310 via the attachment device 320. The inspection unit 120 is provided with an inspection unit control means 450 that drives and controls these linear motion mechanisms 310 and 330. Further, a control device 460 such as a personal computer provided with a storage means 462 for storing the measurement and inspection results of the length measuring probe 380 and the conduction probe 412, 414 is provided, and the control means 400 is provided together with the inspection unit control means 450. To configure.

The details of the inspection unit 120 will be described with reference to FIG. Note that FIG. 2 omits the illustration of the inspection unit control means 450. FIG. 2A is a front view of the inspection unit 120, and FIG. 2B is a side view of the inspection unit 120. The Y-axis linear motion mechanism 310 included in the inspection unit 120 has a rail-shaped guide 314 and a slider 312, and a servomotor (not shown) of a ball screw (not shown) is rotationally driven so that the slider 312 guides the guide rail 314. 2 (a) Move left and right on. Similarly, the first Z-axis linear motion mechanism 330 has a rail-shaped guide 332 and a slider 334, and a servomotor (not shown) rotationally drives a ball screw (not shown) causes the slider 334 to guide the guide rail 332. 2 Move up and down on (a) or (b). Since general-purpose products are available for the Y-axis linear motion mechanism 310 and the first Z-axis linear motion mechanism 330, in order to connect them, the back surface of the first Z-axis linear motion mechanism 330 The mounting device 320 is arranged. By providing the mounting device 320, the first Z-axis linear motion mechanism 330 can move in the Y direction and the left-right direction on FIG. 2A together with the slider 312 of the Y-axis linear motion mechanism 310.

A base plate (mounting plate) 356 that extends over almost the entire width of the first Z-axis linear motion mechanism 330 is fixed to the upper surface of the first Z-axis linear motion mechanism 330. A guide rail 352 extending vertically over substantially the entire length of the base plate 356 is vertically arranged on the upper surface of the base plate 356 and on the right side of FIG. 2A, and the slider 354 engages with the guide rail 352. The guide rail 352 and the slider 354 form a second Z-axis linear motion mechanism 350.

A base plate (length measuring probe mounting plate) 372 having an L-shaped side view for mounting the movable side end of the cylinder 370, which is an actuator, is mounted on the upper surface of the slider 354. In order to fix the fixed side end of the cylinder 370, which is the starting point of the movable part, to the base plate 356, the cylinder holder 360 is in the vertical direction (Z direction) intermediate in the longitudinal direction of the base plate 356. It is attached to the part. The cylinder 370 is inserted into a hole (not shown) formed in the cylinder holder 360 to form a penetration fixing portion, and the penetration fixing portion is used as a fixed end portion of the second Z-axis linear motion mechanism 350. As the slider 354, that is, the base plate 372 moves up and down, it expands and contracts up and down (Z direction).

The movable side end of the cylinder 370 is fixed, and the length measuring probe 380 is spaced from the base plate 372 constituting the second Z-axis linear motion mechanism 350 in the width direction (Y direction) of the base plate 356. The axial middle part is fixed. Therefore, the length measuring probe 380 moves up and down (Z direction) with the vertical movement of the base plate 372 of the second Z-axis linear motion mechanism 350, that is, the expansion and contraction of the cylinder 370. In other words, by controlling the expansion and contraction of the cylinder 370, the length measuring probe 380 can be positioned in the vertical direction. A stopper mounting plate 357 is attached to the lower end surface of the base plate 356, and a stopper 358 is attached to the stopper mounting plate 357. The stopper 358 prevents the base plate 372 of the second Z-axis linear motion mechanism 350 from running away and provides a reference position.

The lower end of the base plate 356 constituting the first Z-axis linear motion mechanism 330, which is separated from the guide rail 352 in the width direction, that is, on the left side of FIG. 2A, has an L-shaped side view. The conduction probe holder 410 is attached. A rotating disk 420 having through holes formed at two points, a central portion and a position away from the central portion, is attached to the horizontal surface portion of the conduction probe holder 410. The first and second conduction probes 412 and 414 are inserted into the through holes formed in the rotating disk 420. The rotary disk 420 is rotationally driven by a drive device (not shown) at the command of the control device 460.

The movement of the inspection unit 120 when the continuity inspection of the peeled portion of the segment coil 54 is performed by using the inspection unit 120 configured in this way will be described with reference to FIGS. 3 and 4. FIG. 3A is a perspective view showing a state in which the end face position of the segment coil 54 to be joined is measured by using the length measuring probe 380 possessed by the inspection unit 120 prior to the continuity inspection, and FIG. 3B is a perspective view. It is a perspective view which shows the state which inspects the continuity of the segment coil 54 to be joined using the 1st and 2nd conduction probes 412 and 414. 4 (a) is a partially enlarged view of FIG. 3 (a), and FIG. 4 (b) is a partially enlarged view of FIG. 3 (b). FIG. 4 (c) is a top view of part A in FIG. 4 (b).

The plurality of segment coils 54 whose ends have been peeled off in the previous step are housed in the stator core 52, for example, 24 pieces (rows) in the circumferential direction and three layers in the radial direction with the peeled end 70 facing the upper surface. Will be done. Then, the motor stator 50 in which the segment coil 54 is housed is mounted on the mounting means 110 in this state. The inspection unit 120 controls the circumferential positioning cylinder 230 and the stepping motor 212 (see FIG. 1) of the Y-axis linear motion mechanism 310 and the mounting means 110 to position the segment coil 54 to be inspected first at the inspection position.

Here, as shown in FIG. 4C, the segment coils 54 and 54 to be joined are arranged so as to abut on the back surface side in the radial direction, and the pair of one segment coil 54 is adjacent to each other. The pair of matching segment coils 54 are arranged with a gap 66 from each other. The height in the axial direction (Z direction) is the same in the pair of the segment coils 54, but the height in the axial direction (Z direction) is not necessarily the same as the pair of the other segment coils 54 in terms of assembly accuracy. do not have. Therefore, in order to inspect whether or not the length of the peeled portion 62 of the segment coil 54 is within the normal length, the height of the upper end surface 58 of each segment coil 54 is measured in advance (step 1), and the height thereof is measured. It is inspected whether or not the peeling portion 62 is formed within a range of a predetermined distance from the measured height position (step 2). In this example, the reference height from the end face of the peeling portion 62 is 10 mm, and the permissible error is less than 1 mm. That is, since the length of the peeling portion 62 needs to be in the range of 10 to 11 mm, there is continuity at the position where the height of the peeling portion 62 is 10 mm from the end face 58, and there is no continuity at the position where the end face 58 is 11 mm. Make sure it is in an insulated state).

In order to execute step 1, as shown in FIG. 3A, a first Z-axis linear motion mechanism which is an actuator of the first and second conduction probes 412 and 414 is used by using the inspection unit control means 450. Position the 330 in the upper position. This prevents the first and second conduction probes 412 and 414 attached to the base plate 356 of the first Z-axis linear motion mechanism 330 via the conduction probe holder 410 from coming into contact with the motor stator 50. .. At the start of step 1, in order to prevent the length measuring probe 380 from colliding with or coming into contact with the motor stator, the base plate 372 of the second Z-axis linear motion mechanism 350 is moved to the position where the cylinder 370 is most retracted. It is rising.

In this state, the length measuring probe 380 is positioned above the pair of the segment coils 54 to be inspected by using the Y-axis linear motion mechanism 310 or the like. Then, the inspection unit control means 450 extends and controls the cylinder 370 to bring the contact portion 381 formed at the lower end of the cylinder 370 into contact with the upper end surface 58 of the segment coil 54 (see FIGS. 4A and 4B). ). The output (height) of the length measuring probe 380 when the length measuring probe 380 abuts on the segment coil 54 is stored in the storage means 462 (see FIG. 1).

Next, in order to execute step 2, the cylinder 370 is retracted to the shortest length, the base plate 372 of the second Z-axis linear motion mechanism 350 is positioned at an upper position, and the length measuring probe 380 is a motor stator. Evacuate from 50. At the same time, the Y-axis linear motion mechanism 310 and the like are controlled to position the second conduction probe 414 for the end face above the segment coil 54 to be inspected. Next, the inspection unit control means 450 drives the first Z-axis linear motion mechanism 330 based on the position of the end face 58 of the segment coil 54 measured by the length measuring probe 380 and stored in the storage means 462, and the second The contact portion 424 of the conduction probe 414 is brought into contact with the end surface 58 of the segment coil 54. The first conduction probe 412 for the side surface abuts on the side surface of the same segment coil 54 to which the contact portion 424 of the second conduction probe 414 abuts at a position 10 mm from the end face in advance. Is set. When the contact portions 422 and 424 of the first and second conduction probes 412 and 414 come into contact with the segment coil, the continuity inspection is executed using the first and second conduction probes 412 and 414 as electrodes (FIG. 3 (b). )reference). After the continuity inspection at the position of 10 mm in height is completed, the first Z-axis linear motion mechanism 330 is further moved downward by 1 mm. At this time, the second conduction probe 414 is relative to the conduction probe holder 410 against the spring 484 (see FIG. 5B) that is pressing the second conduction probe 414 downward. Move upward 1 mm. By the above operation, the first conduction probe 412 is positioned at a position 11 mm from the end face 58, and the second conduction probe 414 is positioned on the end face. Therefore, the first and second conduction probes 412 and 414 are used as electrodes for conduction. Perform the inspection. The result of the continuity test is stored in the storage means 462.

Since the segment coil 54 of this embodiment has a rectangular cross section, the inspection of the length of the peeled portion 62 is performed on three side surfaces 60a, 60b, 60c out of the four surfaces forming the side surface of the segment coil 54. The remaining one surface cannot be inspected because it forms a joint 56 facing the back surface of the paired segment coils 54, but it does not affect the continuity of the other segment coils 54 in pairs, so inspection is unnecessary. be. Step 2 is sequentially executed for the three side surfaces 60a, 60b, and 60c of the peeled portion. At that time, once the inspection of the one side surface 60a is completed, the first and second conduction probes 412 and 414 are once separated from the segment coil 54. The inspection unit control means 450 drives and controls the rotating disk 420, which is the rotating means, to move the position of the first conduction probe 412 from the side surface 60a to the side surface 60b. Then, the contact portions 422 and 424 of the first and second conduction probes 412 and 414 are brought into contact with the predetermined positions of the segment coil 54 to inspect the continuity. When the continuity inspection of the side surface 60b is completed, the first continuity probe 412 is moved to the side surface 60c.

After the continuity inspection of each of the three sides of the pair of segment coils 54 (the position of the end face conduction probe 414 is changed for each of the three inner sides in a total of six sides) is completed, the continuity inspection is performed on the other adjacent segment coils 54. Execute. When the other adjacent pair of segment coils 54 to be inspected next are adjacent to each other in the radial direction of the motor stator 50, the Y-axis linear motion mechanism 310 is controlled and driven, and the height is measured by the length measuring probe 380. The inspection is performed from step 1. When another pair of adjacent segment coils 54 to be inspected next are adjacent to each other in the circumferential direction of the motor stator 50, the stepping motor 212 of the mounting means 110 is driven and only the pitch of one segment coil is reached. The motor stator 50 is rotated in the circumferential direction.

Next, details of another embodiment of the rotating portion for rotating the conduction probes 412 and 414 to inspect the continuity of the three sides of the segment coil 54 will be described with reference to FIG. In the above embodiment, the rotating means 420 is rotated by a drive unit (not shown), but in this embodiment, the rotation control device 464 rotates the conduction probe 412 via a pair of rotating disks 470 and 472. .. 5 (a) is a perspective view of the rotating portion of the conduction probe 412 and 414, FIG. 5 (b) is a front view thereof, and FIG. 5 (c) is a side view thereof.

In order to hold the conduction probe 412 and 414, a conduction probe holder 410 having an L-shaped side view is attached to the base plate 356. A rotation control device 464 for rotationally driving the conduction probe 412 and 414 is attached to the lower surface of the conduction probe holder 410. The rotation control device 464 includes a drive motor (not shown), and an upper rotation disk 470 is attached to the shaft of the drive motor. Here, the upper rotary disk 470 is configured to be movable in the X-axis direction (direction perpendicular to both the vertical direction and the moving direction of the Y-axis linear motion mechanism 310) together with the drive motor.
The lower rotating disk 472 is arranged at an interval from the upper rotating disk 470 in the vertical direction. The upper rotating disk 470 and the lower rotating disk 472 are connected by a plurality of (three in the figure) columns 474. Therefore, when the upper rotating disk 470 rotates, the lower rotating disk 472 also rotates synchronously.

A through hole is formed in the center of the lower rotating disk 472, and the conduction probe 414 for the end face is fitted in the hole. A spring 484 is disposed in contact with the upper end of the conduction probe 414, and is held in the cap 482 together with a portion of the continuity probe 414 extending upward from the upper rotation disk 470. On the other hand, the conduction probe 412 for the side surface is fitted into a hole formed obliquely eccentrically with the lower rotating disk 472. What is each conduction probe 412, 414 when the respective conduction probes 412 and 414 are fitted in the holes where the conduction probe 421 for the side surface and the conduction probe 414 for the end surface are fitted formed in the lower rotating disk 472? In the free state, the difference in height between the conduction probe 412 and the tip of the conduction probe 414, more correctly, the contact portions 422 and 424 in the vertical direction is set to the limit height of the peeling portion. ing. In this example, the adhesive mounting position of the cap 482 is adjusted so as to be 10 mm.

Therefore, both conduction probes 412 and 414 are lowered to the height position measured by the length measuring probe by using the first Z-axis linear motion mechanism 330, and the continuity probe 414 for the end face abuts on the end face of the segment coil 54. At that time, the spring 484 maintains the initial state. When the inspection of the peeling portion 62 is completed and the first Z-axis linear motion mechanism 330 is further lowered to inspect the non-peeling portion or the insulating portion 64, the conduction probe 412 is moved to the insulating portion 64 together with the lower rotating disk 472. Although lowered, the spring 484 in the cap 482 contracts and the conduction probe 414 for the end face remains in contact with the end face of the segment coil 54. That is, the conduction probe 414 for the end face rises relatively with respect to the lower rotating disk 472. At the time of continuity inspection, the lead wire 478 connected to the cap 482 or the continuity probe 414 for the end face and the lead wire 476 connected to the continuity probe 412 for the side surface are energized from the rotation control device 464 or the control device 460 to make the continuity state. Can be inspected. The test result is stored in the storage means 462 (see FIG. 1).

The details of the peeling inspection method of the segment coil 54 using the peeling inspection apparatus 100 configured as described above will be described with reference to the flowcharts shown in FIGS. 6 and 7. FIG. 6 is a flowchart showing an embodiment of the peeling inspection method according to the present invention, and FIG. 7 is a flowchart showing a peeling inspection method according to another embodiment.

First, reference point (zero point) alignment of each probe 380, 421, 414 is performed. This is because the length measuring probe 380 and the conduction probe 412, 414 can move independently. Zero point alignment is performed using a standard such as a block gauge or by mounting the reference stator model on the mounting table 220 (step S502). As an example of zero point alignment, a block with a known step is prepared, the contact portion 381 of the length measuring probe 380 is brought into contact with the high step portion, and the contact portion of the first conduction probe 412 is brought into contact with the low step portion. The portion 422 is brought into contact with each other. At this time, the second Z-axis linear motion mechanism 350 is brought into contact with the stopper 358. The position of the length measuring probe 380 at this time is set as the zero point.

After the zero point alignment of each probe 380, 421, 414 is completed, the motor stator 50 to be inspected, which is carried to the inspection unit 120 in a batch system or an assembly line system, is placed by the mounting means 110 using a transfer robot or the like (not shown). (Step S504). Then, using a stepping motor 212, a Y-axis linear motion mechanism 310, or the like, the length measuring probe 380 is positioned so that the length measuring probe 380 is located directly above the measurement target segment coil 54 (step S510). At this time, in the first Z-axis linear motion mechanism 330, the inspection unit control means 450 drives and controls the ball screw so that the base plate 356 attached to the slider 334 is located at the upper position (near the upper limit within the movement range). .. The above is the preparatory stage for the peeling inspection (FIG. 6 (a)).

Next, the process proceeds to the actual peeling inspection process shown in FIG. 6 (b). When the inspection is started, in step S512, the cylinder 370 is extended and the length measuring probe 380 is brought into contact with the segment coil. At this time, as the cylinder 370 extends, in the second Z-axis linear motion mechanism 350, the slider 354 to which the base plate 372 to which the tip end portion of the cylinder 370 is fixed moves downward with the guide rail 352 as a guide. Then, the bottom surface of the base plate 372 abuts on the stopper 358 and stops. Since the length measuring probe 380 is also fixedly attached to the base plate 372, the length measuring probe 380 also moves downward with the extension of the cylinder 370. Then, when the base plate 372 comes into contact with the stopper 358, the length measuring probe 380 that has been in contact with the segment coil 54 immediately before the contact of the base plate 372 retracts, and the change in the position is referred to as the reference height (zero point). It is stored in the storage means 462 as a change from. With this, the measurement reference position of the segment coil 54 to be measured or inspected this time is obtained.

Since the height of the end face 58 of the segment coil 54 to be inspected was obtained, the length measuring probe 380 is raised so that the length measuring probe 380 does not interfere with the stator 50 or the like in the peeling inspection. Specifically, the cylinder 370 is retracted, and the base plate 372 is retracted upward from the motor stator 50 together with the slider 354 of the second Z-axis linear motion mechanism 350 (step S514).

Next, the stepping motor 212 and the Y-axis linear motion mechanism 310 are used to position the second conduction probe 414 directly above the end face 58 of the segment coil to be inspected. The positioned second conduction probe 414 is lowered to the measurement reference position measured by the length measuring probe 380, and the contact portion 381 of the length measuring probe 380 is brought into contact with the end surface 58 of the segment coil 54 (step S516). In the following processing, the lowering and ascending of the first and second conduction probes 412 and 414 are achieved by rotationally driving the ball screw provided in the first Z-axis linear motion mechanism 330 by the servomotor. Since the positioning accuracy of the first Z-axis linear motion mechanism 330 is several μm, it has sufficient accuracy to determine the peeling position. The inspection unit control means 450 that controls the second Z-axis linear motion mechanism 350 reads the height of the end face 58 of the segment coil 54 measured by the length measuring probe 380 from the storage means 462, and uses the measured value of the ball screw. The amount of rotation, that is, the amount of movement of the slider 334 is determined.

At the same time, the first continuity probe 412 is lowered to the position of the first continuity inspection height, for example, 10 mm from the end face 58. Then, the first conduction probe 412 is brought into contact with one side surface 60a of the segment coil (step S520). If the difference in height between the contact portion 422 of the first continuity probe 412 and the contact portion 424 of the second conduction probe 414 is set in advance to the first continuity inspection height, this process is performed. It is executed at the same time as S516.

When the two conduction probes 412 and 414 come into contact with the segment coil 54, they are energized using the lead wires 476 and 478 and inspected for continuity (step S522). At the first continuity inspection height, if the peeling process of the segment coil 54 is normal, the peeling portion 62 is formed, so that there is continuity in the normal state. If there is continuity, the process proceeds to step S526. If there is no continuity, it indicates that the peeling process was insufficient. Therefore, as a defective product (NG), the position in the circumferential direction of the segment coil 54 currently inspected with respect to the reference position 50a (see FIG. 1) of the motor stator 50 is stored in the storage means 462 together with the NG information. (Step S524), and the process proceeds to step S526.

Next, in step S526, the first conduction probe 412 is further lowered on the same side surface of the segment coil 54 and abuts on the segment coil 54 at a second continuity inspection height, for example, a height of 11 mm from the end face 58. Let me. At this time, the second conduction probe 414 is displaced upward by 1 mm with respect to the conduction probe holder 410 or the rotating disk 420 (470, 472) against the spring 484 shown in FIG. 5 (b). As a result, the second continuity inspection state is realized. Similar to step S522, the quality of the peeling process is inspected (step S528). However, this time, unlike step S522, the fact that there is continuity between the two conduction probes 412 and 414 means that the length of the peeling portion 62 is too long, which is a defect. At this second continuity inspection height, if it is non-conducting, the insulating portion 64 is maintained, so that it is a good product. Therefore, if there is no continuity, the process proceeds to step S532, but if there is continuity, the position and NG information of the defective segment coil 54 are stored in the storage means 462 as a defective product as in step S524 (step S530).

Now that the inspection of one side surface 60a of the segment coil 54 is completed, the inspection position is changed to the other side surface 60b of the same segment coil 54. Even if the rotating means 420 is rotated as it is, the rotation is blocked at the corners of the segment coil 54. Therefore, after raising the first conduction probe once, the rotation means to which the conduction probes 412 and 414 are attached. The 420 (472) is rotated to allow the first conduction probe 412 to abut on the other side surface (step S532).

As described above, since the three sides of one segment coil 54 are inspected, the same process is repeated three times (step S534). If the inspection of the same segment coil 54 is completed in step S534 and there is no other aspect to be inspected, the second conduction probe 414 is raised (step S536) to move to the inspection of the other segment coil 54. , Step S538.

When the inspection of all the segment coils 54 to be inspected in the same motor stator 50 is completed in step S538, the process proceeds to the completion process of the peeling inspection from step S550 (FIG. 6 (c)). If the segment coil 54 to be inspected still remains in step S538, the process proceeds to step S540. In step S540, it is determined whether or not the segment coils 54 to be inspected next are in the same row in the motor stator 50. Here, the same row refers to one row arranged from the inner diameter side to the outer diameter side at the same position in the circumferential direction of the motor stator. Since the motor stator illustrated in this embodiment includes 24 segments (rows) in the circumferential direction and 3 layers of segment coils 54 in the radial direction, a pair of 3 segment coils 54 (segment coils 54) in one row. It contains 6 pieces) (see FIG. 4 (c)).

If the movements of the conduction probes 412 and 414 are within the same row, the inspection unit control means 450 drives and controls the stepping motor included in the Y-axis linear motion mechanism 310, and the conduction probes 412 and 414 are controlled by one pair of the segment coils 54. Is moved from the inner diameter side to the outer diameter side, or vice versa (step S542). In step S540, if the movement of the conduction probes 412 and 414 is not in the same row but to the next row, the stepping motor 212 of the mounting means 110 is driven and controlled to rotate around the motor stator 50 by one segment. Rotate in the direction (step S544). Then, the above process is continued until the inspection of all the segment coils 54 in the same motor stator 50 is completed.

When the peeling inspection process is completed (step S550), the process proceeds to the post-processing of FIG. 6 (c). This post-treatment is a process of checking for the presence or absence of a defective product (NG product) by a peeling inspection of the motor stator 50. It is confirmed whether or not the defective (NG) information is stored in the storage means 462 included in the control device 460 (step S552). If even one defect (NG) is stored, an alarm is generated in step S554 to notify the operator. The operator will hear the alarm, investigate the peeling situation at the corresponding position, and repair or improve the peeling machine if the occurrence of the peeling defect is unique to the peeling machine. In addition, if it occurs sporadically for some reason, the peeled part will be corrected manually. That is, by providing such a post-treatment, it is possible to prevent the same peeling machine from continuously causing defects at an early stage.

FIG. 7 shows another embodiment of the peeling inspection method for the segment coil 54. In FIG. 7, the process to which the same step numbers as those in FIG. 6 are applied is the same as the process in FIG. 6, so the description thereof will be omitted. This embodiment differs from the embodiment shown in FIG. 6 in that the inspection is immediately interrupted when a defect (NG) is detected in the peeling inspection. This is to avoid having to inspect a large number of defective products by extracting defective products at an early stage even if the automatic work is stopped when the frequency of defective occurrence is extremely rare.

Specifically, in the process of step S522, which is an inspection at a conductive position, or step S528, which is an inspection at a non-conducting or insulated position, if a defect is detected, the automatic inspection is immediately stopped (step S610). , Notify the operator with an alarm (step S612). Upon hearing the alarm, the operator either removes the motor stator 50 in which the defect is detected from the inspection unit 120 and arranges a new motor stator 50 in the inspection unit, or stops the subsequent inspection. This avoids the continuous occurrence of defective products and minimizes the inspection work for defective products. This method is suitable for rewinding the segment coil from scratch on the stator core of the defective motor stator 50.

As described above, according to each embodiment of the present invention, it is possible to automatically and surely determine whether or not the peeled portion at the joint portion of the segment coil is appropriate, and the work efficiency is improved and the reliability is improved. do. In addition, it is not necessary to visually monitor the worker, and the burden on the worker is extremely reduced. Further, when a defect occurs due to the same peeling device, the cause of the peeling failure can be fed back to the peeling device at an early stage, the yield rate of motor stator manufacturing is improved, or the amount of work related to the defective product is reduced.

50 ... (motor) stator, 50a ... reference position, 52 ... stator core, 54 ... segment coil, 56 ... junction, 58 ... (top) end face, 60, 60a, 60b, 60c ... measurement side surface, 62 ... peeling part, 64 ... Insulated part (non-peeling part), 66 ... Gap (space), 70 ... (Segment coil) end, 100 ... Peeling inspection device, 110 ... Mounting means, 120 ... Inspection part, 212 ... Stepping motor, 214 ... ( (Toothed) pulley, 216 ... Toothed belt, 218 ... (Toothed) pulley, 220 ... Mounting table, 222 ... Stator fitting shaft (simulated rotor), 230 ... Cylinder, 232 ... Positioning block, 310 ... Y-axis linear motion Mechanism, 312 ... Slider, 314 ... Guide rail, 320 ... Mounting device, 330 ... First Z-axis linear motion mechanism, 332 ... Guide rail, 334 ... Slider, 350 ... Second Z-axis linear motion mechanism, 352 ... Guide Rail, 354 ... Slider, 356 ... Base plate (mounting plate), 357 ... (Stopper) mounting plate, 358 ... Stopper, 360 ... Cylinder holder, 370 ... Cylinder (actuator), 372 ... Base plate (length measuring probe mounting plate) ), 380 ... Length measuring probe, 381 ... Contact part, 400 ... Control means, 410 ... (Conduction) probe holder, 412 ... (First) conduction probe (for side surface), 414 ... (Second) conduction Probe (for end face), 420 ... Rotating means (rotating disk), 422 ... Contact part, 450 ... Inspection unit control means, 460 ... Control device, 462 ... Storage means, 464 ... Rotation control device, 470 ... (Top) Rotating disk, 472 ... (Bottom) Rotating disk, 474 ... Support, 476, 478 ... Lead wire, 482 ... Cap, 484 ... Spring

Claims (7)

In the method for inspecting a motor stator in which a segment coil is housed in a stator core, whether the peeling length of the peeling portion, which is a joint end between the segment coils, is within a predetermined length range after the segment coil is wound around the stator core. A peeling inspection method for segment coils that detects whether or not it is joined before joining. First, a step of measuring the end position of each segment coil, a step of detecting the conduction state of the segment coil at a first position separated from the end position of the segment coil by a first predetermined distance, and a step of detecting the conduction state of the segment coil, and the segment coil. The peeling inspection method for a segment coil according to claim 1, further comprising a step of detecting a conduction state of the segment coil at a second position separated from the end position of the segment coil by a second predetermined distance. If continuity is confirmed at the first position and non-conduction is confirmed at the second position for all the segment coils to be joined, it is judged as a non-defective product and the next process is manufactured. The peeling inspection method for a segment coil according to claim 2, wherein the product is determined to be defective and fed back to the previous process or the production is discontinued. In a segment coil peeling inspection device including a mounting means for rotatably mounting a motor stator in which a segment coil is housed and an inspection unit arranged apart from the mounting means.
The inspection unit includes a length measuring probe that can move in the axial direction of the motor stator, and a first conduction probe for detecting continuity that is arranged apart from the length measuring probe and can move in the axial direction of the motor stator. A segment coil peeling inspection device comprising a second conduction probe. At the time of continuity inspection of the segment coil, the first continuity probe for continuity inspection is an end portion of the segment coil and can abut on the side surface portion, and the second continuity probe for continuity inspection is The segment according to claim 4, wherein the first conduction probe and the second conduction probe are arranged so as to be able to abut on the end face of the segment coil to be inspected. Coil peeling inspection device. The length measuring probe is connected to a first actuator that drives the length measuring probe in the axial direction of the stator, and the first conduction probe and the second conduction probe are the first conduction probe. , And a second actuator that drives the second conduction probe in the axial direction of the stator and a control means that controls the drive amount of the second actuator, and the control means is connected to the first conduction. The probe is driven and controlled from the end face of the segment coil to the first position and the second position on the inner side in the axial direction by using the second actuator, and the first conduction probe is controlled by the end of the segment coil. The peeling inspection device for a segment coil according to claim 5, further comprising a rotating means that can rotate around the portion. The peeling inspection of the segment coil according to claim 6, wherein the first position is a peeling portion detection position of the segment coil, and the second position is an insulating portion detecting position of the segment coil. Device.

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