KR20240007007A - System of quality inspection for hairpin motor - Google Patents

Abstract

An axial imaging device provided above or below the rotation axis of the stator to photograph the upper or lower surface of the stator; A lateral imaging device provided on the side of the stator to photograph the side of the stator; And for each process of manufacturing the stator, images are captured through an axial imaging device and a lateral imaging device. The alignment of the hairpin in the plane perpendicular to the rotation axis is inspected through the images from the axial imaging device, and the images from the lateral imaging device are inspected. A hairpin motor quality inspection system including an inspection controller that inspects the height of the hairpin in the height direction is introduced.

Description

Hairpin motor quality inspection system {SYSTEM OF QUALITY INSPECTION FOR HAIRPIN MOTOR}

The present invention relates to a hairpin motor quality inspection system that is equipped with a photographing device in the process of manufacturing a hairpin motor to photograph hairpins inserted into the stator for each process and inspects the hairpins inserted into the stator based on the captured images. .

Generally, a drive motor is applied to hybrid or electric vehicles, and by increasing the efficiency of the drive motor, hybrid vehicles can improve fuel efficiency (mileage per liter), and electric vehicles can improve mileage (mileage per charge). It becomes possible.

Such a conventional driving motor for a vehicle consists of a stator and a rotor, the stator is provided with a slot, and a number of hairpins interposed with insulating paper are inserted into the slot.

These hairpins are generally formed in a U shape, and after the hairpin is inserted into the slot of the stator, the hairpin legs are widened to provide a predetermined distance between the legs. The hairpin legs are then twisted, and after twisting, welding for electricity is performed for each pair of adjacent hairpin legs. As the hairpin inserted into the stator goes through several processes, it is necessary to measure or confirm the quality of the hairpin for each process. However, in most current processes, there is a problem in checking the quality of hairpins only with the naked eye.

However, before welding of the hairpin leg is performed, the quality of the hairpin inserted into the stator is checked, and a separately provided quality confirmation device is used at this time. The quality check device confirms quality by forming a plurality of holes corresponding to the hairpin leg and inserting the hairpin leg into the plurality of holes. If the hairpin inserted into the stator is not properly inserted into the quality check device after widening and twisting, it is detected as a defective hairpin. This is a method of checking the quality of the hairpin through physical contact, which may cause damage to the hairpin and reduce the performance of the hairpin motor.

In addition, when welding twisted hairpin legs, the quality of the hairpin is checked through a 3D vision program, but this also has the problem of low reliability of data.

The matters described as background technology above are only for the purpose of improving understanding of the background of the present invention, and should not be taken as recognition that they correspond to prior art already known to those skilled in the art.

KR 10-2322361 B1

The present invention was proposed to solve this problem. In the process of manufacturing a hairpin motor, it is equipped with an axial imaging device and a lateral imaging device to photograph the hairpin inserted into the stator for each process, and based on the photographed images, The purpose is to provide a hairpin motor quality inspection system that checks hairpins inserted into the stator.

The hairpin motor quality inspection system according to the present invention for achieving the above object includes an axial imaging device provided above or below the rotation axis of the stator to photograph the upper or lower surface of the stator; A lateral imaging device provided on the side of the stator to photograph the side of the stator; And for each process of manufacturing the stator, images are captured through an axial imaging device and a lateral imaging device. The alignment of the hairpin in the plane perpendicular to the rotation axis is inspected through the images from the axial imaging device, and the images from the lateral imaging device are inspected. It includes an inspection controller that inspects the height of the hairpin in the height direction.

The axial imaging device and the lateral imaging device are inserted into the stator and can photograph the leg side of the hairpin exposed to the outside.

When shooting a stator using an axial imaging device and a lateral imaging device, if the stator is fixed, the axial imaging device and the lateral imaging device rotate around the rotation axis to capture images, and if the stator rotates based on the rotation axis, the axial imaging device and the lateral imaging device take photos. The device can be fixed and take pictures.

A motor that performs rotation of the stator or rotation of the axial imaging device and the lateral imaging device; and a motor controller that calculates a rotation angle according to the stator and controls the motor to rotate for each calculated rotation angle. The rotation angle may be calculated according to the number of slots formed in the stator.

The axial imaging device includes a first axial imaging device that performs zero point correction; and a second axial imaging device that operates in the same manner as the first axial imaging device and photographs the alignment of the hairpins of the stator when zero point correction through the first axial imaging device is completed.

The first axial imaging device photographs the stator while performing zero point correction, and the inspection controller calculates data from the images captured through the first axial imaging device and sets inspection standards for hairpin alignment based on the calculated data. You can.

The inspection controller predicts the midpoint of the stator on a plane perpendicular to the rotation axis through the image captured by the first axial imaging device, and based on the predicted midpoint of the stator, the inner diameter of the stator and the distance from the midpoint of the stator to the end of each slot The distance can be calculated from data.

The inspection controller can inspect the alignment gap of the hairpin legs through the image of the axial imaging device during the inserting, widening, twisting, or cutting process of the hairpin.

The inspection controller can inspect the vertical alignment interval or the left and right alignment interval between the plurality of hairpin legs located in the slot through the image of the axial imaging device during the inserting, widening, twisting, or cutting process of the hairpin.

The inspection controller can inspect the size, location, and distance between welds through images from an axial imaging device during the hairpin welding process.

The inspection controller can inspect the twisting angle of the hairpin leg, the height of the cutting part and decoating part, or the height of the welding part through the image of the lateral imaging device during the twisting or cutting or welding process of the hairpin.

After the insulation paper is inserted into the stator, the inspection controller can inspect the thickness and shape of the insulation paper located in the slot in the plane perpendicular to the rotation axis through the image of the axial imaging device.

After the insulation paper is inserted into the stator, the inspection controller can inspect the height of the insulation paper exposed to the outside in the height direction through the image of the lateral imaging device.

According to the hairpin motor quality inspection system of the present invention, the hairpin inserted into the stator is photographed using an axial imaging device and a lateral imaging device, and the alignment and height of the hairpin are checked in a non-contact manner based on the photographed image. It is effective in preventing quality deterioration due to physical contact during quality inspection.

In addition, by checking the alignment and height of the hairpin in each production process of the hairpin motor, defects in each process can be identified and responded to in advance, which has the effect of improving the productivity of the hairpin motor.

1 to 2 are diagrams showing the configuration of a hairpin motor quality inspection system according to an embodiment of the present invention.
Figure 3 is a plan view of the upper or lower surface of a stator into which a hairpin is inserted, taken using an axial imaging device according to an embodiment of the present invention.
4 to 9 are inspection images of images captured through an axial imaging device for each process according to an embodiment of the present invention.
10 and 11 are inspection images of images captured through a lateral imaging device for each process according to an embodiment of the present invention.
12 to 13 are inspection images of images captured through an axial imaging device and a lateral imaging device when inserting insulation paper according to an embodiment of the present invention.

In describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed descriptions will be omitted. In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present invention are not limited. , should be understood to include equivalents or substitutes.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, terms such as “comprise” or “have” are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted.

1 to 2 are diagrams showing the configuration of a hairpin motor quality inspection system according to an embodiment of the present invention, and Figure 3 is an upper surface of a stator into which a hairpin is inserted, photographed through an axial imaging device according to an embodiment of the present invention. Or, it is a top view of the lower surface, and Figures 4 to 9 are inspection images of images taken through an axial imaging device for each process according to an embodiment of the present invention, and Figures 10 to 11 are according to an embodiment of the present invention. These are inspection images of images captured through a lateral imaging device for each process, and Figures 12 and 13 are inspection images of images captured through an axial imaging device and a lateral imaging device when inserting insulating paper according to an embodiment of the present invention.

1 to 2 are diagrams showing the configuration of a hairpin motor quality inspection system according to an embodiment of the present invention. The hairpin motor quality inspection system according to the present invention includes an axial imaging device 300 provided above or below the rotation axis of the stator 200 to photograph the upper or lower surface of the stator 200; A lateral imaging device 400 provided on the side of the stator 200 to photograph the side of the stator 200; And for each process of manufacturing the stator 200, images are captured through the axial imaging device 300 and the lateral imaging device 400, and images are captured on a plane perpendicular to the rotation axis through the images of the axial imaging device 300. It includes an inspection controller 500 that inspects the alignment of the hairpin 100 and inspects the height of the hairpin 100 in the height direction through the image of the lateral imaging device 400.

Before explaining the present invention, the controller includes a communication device that communicates with other controllers or sensors to control the function in charge, a memory that stores operating system or logic commands and input/output information, and judgment necessary to control the function in charge. It may include one or more processors that perform calculations, decisions, etc. In addition, the unit or control unit included in the name of the motor controller (MCU: Motor Control Unit, 700) is only a widely used term for naming a control device (controller) that controls a specific function. It does not mean a generic function unit.

When quality inspection is performed in the existing hairpin motor manufacturing process, there is no system in place to visually check each process or measure separate quality. However, in the case of the widening and twisting processes of the hairpin 100 inserted into the stator 200, inspection was performed using separate inspection equipment. However, the provided inspection equipment inspected the quality by physically contacting the hairpin 100 inserted into the stator 200 after the widening and twisting processes were completed. There is a problem that the quality of the hairpin 100 may be deteriorated in the process of inspecting the quality of the hairpin 100 when the inspection equipment physically contacts the hairpin 100. Accordingly, the present invention seeks to construct a system that performs quality inspection for each process of the hairpin motor in a way that does not cause physical contact.

Specifically, the present invention is provided with a photographing device capable of photographing the stator 200 and the hairpin 100 inserted into the stator 200. Based on the position of the stator 200, the imaging device is divided into an axial imaging device 300 and a lateral imaging device 400 according to the provided position and role. The axial imaging device 300 is provided above or below the rotation axis of the stator 200 to photograph the upper or lower surface of the stator 200. And the lateral imaging device 400 is provided on a plane perpendicular to the rotation axis of the stator 200 to photograph the side of the stator 200. Referring to FIG. 1, the stator 200 and the axial imaging device 300 are provided on the same rotation axis, and the axial imaging device 300 is provided below the stator 200 to photograph the lower surface of the stator 200. . However, the positions of the stator 200 and the axial imaging device 300 shown in FIG. 1 are only one embodiment, and the positions of the stator 200 and the axial imaging device 300 may be different from each other.

Additionally, the axial imaging device 300 and the lateral imaging device 400 provided on the system are inserted into the stator 200 and photograph the leg side of the hairpin 100 exposed to the outside. That is, the axial imaging device 300 and the lateral imaging device 400 are positioned to photograph the leg side of the hairpin 100. The hairpin 100 has a head and legs, and after the hairpin 100 is inserted into the stator 200, a process is performed on the leg side of the hairpin 100. Therefore, in order to inspect the quality of each hairpin motor manufacturing process, it is necessary to photograph the leg side of the hairpin 100. In addition, the axial imaging device 300 and the lateral imaging device 400 photograph the leg side of the hairpin 100 according to the direction (upper or lower) in which the leg side of the hairpin 100 is exposed from the stator 200. The positions of the axial imaging device 300 and the lateral imaging device 400 may vary.

Meanwhile, a plurality of hairpins 100 are inserted into the stator 200 in a circular manner. Accordingly, the axial imaging device 300 and the lateral imaging device 400 need to photograph the leg side of all hairpins 100 inserted into the stator 200. Therefore, when photographing the stator 200 through the axial imaging device 300 and the lateral imaging device 400, if the stator 200 is fixed, the axial imaging device 300 and the lateral imaging device 400 rotate based on the rotation axis. and film. However, when the stator 200 rotates about the rotation axis, the axial imaging device 300 and the lateral imaging device 400 are fixed and take pictures. In one embodiment, the axial imaging device 300 and the lateral imaging device 400 are formed as a camera, and as they are formed as a camera, the size of the area observed during one photographing is determined. In order to perform quality inspection by photographing the leg side of the hairpin 100 inserted into the stator 200, precise photographing is required, and therefore the stator 200, the axial imaging device 300, and the lateral imaging device 400 It needs to be located close by. However, as the axial imaging device 300 and the lateral imaging device 400 are formed with cameras, the distance becomes closer, and the size of the area observed during one photographing is limited, making it difficult to photograph the leg side of all hairpins 100. There is. Therefore, in order to photograph the leg side of all hairpins 100 inserted into the stator 200, the stator 200 or the axial imaging device 300 and the lateral imaging device 400 need to rotate.

In the present invention, as an example, the stator 200 is fixed, and the axial imaging device 300 and the lateral imaging device 400 rotate to photograph the stator 200. Referring to FIG. 2, it can be seen that the axial imaging device 300 and the lateral imaging device 400 rotate based on the rotation axis of the stator 200. The axial imaging device 300 and the lateral imaging device 400 are positioned to face the leg side of the hairpin 100 inserted into the stator 200, and the axial imaging device 300 and the lateral imaging device 400 rotate. By performing photography through , it is possible to photograph and quality check all hairpins 100 inserted into the stator 200.

In order to perform imaging through rotation in this way, the hairpin motor quality inspection system of the present invention includes a motor 600 that performs rotation of the stator 200 or rotation of the axial imaging device 300 and the lateral imaging device 400; and a motor controller 700 that calculates a rotation angle according to the stator 200 and controls the motor 600 to rotate for each calculated rotation angle. At this time, the rotation angle is calculated according to the number of slots 210 formed in the stator 200. When the stator 200 rotates or the axial imaging device 300 and the lateral imaging device 400 rotate, they need to be connected to the motor 600 so that they can rotate respectively.

In the present invention, the stator 200 is fixed and the axial imaging device 300 and the lateral imaging device 400 rotate, so that the axial imaging device 300 and the lateral imaging device 400 are connected to the motor 600. . At this time, a plurality of motors 600 may be provided to separately rotate the axial imaging device 300 and the lateral imaging device 400. For example, the motor 600 may be composed of a first motor and a second motor, the first motor may be connected to the axial imaging device 300, and the second motor may be connected to the lateral imaging device 400. . The first motor can allow the axial imaging device 300 to take pictures while rotating clockwise about the rotation axis. The second motor can allow the lateral imaging device 400 to take pictures while rotating counterclockwise about the rotation axis. That is, the axial imaging device 300 and the lateral imaging device 400 can be configured to rotate together in the same direction by providing a single motor 600, and the axial imaging device 300 can be configured to rotate together in the same direction by providing a plurality of motors 600. (300) and the lateral imaging device (400) can be configured to rotate in different directions.

And the motor controller 700 connected to the motor 600 controls the rotation of the motor 600. The axial imaging device 300 and the lateral imaging device 400 rotate by the motor 600. At this time, the motor 600 needs to be rotated so that the axial imaging device 300 and the lateral imaging device 400 can photograph all the hairpins 100 inserted into the stator 200 one by one. Therefore, the motor controller 700 is provided so that the rotation of the motor 600 can be controlled by a trigger signal from the motor controller 700. Also, it is necessary to control the rotation angle when the motor 600 rotates so that all hairpins 100 inserted into the stator 200 can be photographed one by one through the motor controller 700.

Figure 3 is a plan view of the upper or lower surface of a stator into which a hairpin is inserted, taken using an axial imaging device according to an embodiment of the present invention. Referring to FIG. 3, a slot 210 is formed in the stator 200, and the hairpin 100 is inserted into the slot 210 of the stator 200. The axial imaging device 300 and the lateral imaging device 400 rotate and must sequentially photograph all hairpins 100 based on the hairpins 100 inserted into the randomly selected slots 210 during imaging. Therefore, the motor 600 needs to be rotated so that the axial imaging device 300 and the lateral imaging device 400 can capture images in each slot 210 formed in the stator 200. Accordingly, when the number of slots 210 of the stator 200 is input, the motor controller 700 sets the rotation angle ( ) needs to be calculated. And the motor controller 700 calculates the rotation angle ( ) By controlling the rotation of the motor 600 according to the axial imaging device 300 and the lateral imaging device 400, all hairpins 100 of the stator 200 can be photographed.

And referring to Figures 1 and 2, it can be seen that a plurality of axial imaging devices 300 are formed. The axial imaging device 300 includes a first axial imaging device 310 that performs zero point correction; and a second axial direction that operates in the same manner as the first axial imaging device 310 and photographs the alignment of the hairpin 100 of the stator 200 when zero point correction through the first axial imaging device 310 is completed. It may be composed of a photographing device 320. In the present invention, in one embodiment, since the axial imaging device 300 is formed as a camera, it is necessary to set the zero point before photographing. Accordingly, the axial imaging device 300 needs to include a first axial imaging device 310 that performs zero point correction.

And the axial imaging device 300 has the same behavior as the first axial imaging device 310 and includes a second axial imaging device 320 that photographs the hairpin 100 of the stator 200. Even if the axial imaging device 300 is composed of a first axial imaging device 310 and a second axial imaging device 320 and each role is divided, the first axial imaging device 310 and the second axial imaging device 320 Device 320 must be provided at the same location. Since the first axial imaging device 310 and the second axial imaging device 320 are provided at the same location, zero point correction is performed through the first axial imaging device 310, and the zero point correction is completed in the second axial direction. The imaging device 320 can photograph the alignment of the hairpins 100 of the stator 200. As the axial imaging device 300 is divided into a first axial imaging device 310 and a second axial imaging device 320, the motor 600 is also divided into a first axial imaging device 310 and a second axial imaging device. Each can be connected to the device 320 to perform rotation. In addition, referring to FIG. 2, in order to perform zero point correction of the first axial imaging device 310, the first axial imaging device 310 and the second axial imaging device 320 move up and down along the rotation axis. You can. Accordingly, the motor 600 connected to the first axial imaging device 310 and the second axial imaging device 320 can rotate not only based on the rotation axis but also move up and down along the rotation axis. In addition, the lateral imaging device 400 can also move up and down horizontally on the rotation axis, and the motor 600 connected to the lateral imaging device 400 can rotate so that the lateral imaging device 400 moves up and down.

In order to ensure the same behavior of the first axial imaging device 310 and the second axial imaging device 320, the system of the present invention, as an embodiment, may include an index 800. By attaching the first axial imaging device 310 and the second axial imaging device 320 to the upper or lower surface of the index 800, they can perform the same operation. Additionally, when the index 800 is provided, the motor 600 does not directly rotate the axial imaging device 300, but allows the index 800 to rotate.

Meanwhile, the hairpin motor quality inspection system of the present invention performs quality inspection based on the image of the hairpin 100 inserted into the stator 200 captured through the axial imaging device 300 and the lateral imaging device 400. An inspection controller (500) is provided. When the axial imaging device 300 photographs the upper or lower surface of the stator 200, the inspection controller 500 aligns the hairpin 100 on a plane perpendicular to the rotation axis through the image of the axial imaging device 300. inspect. In addition, as the lateral imaging device 400 photographs the side of the stator 200, the inspection controller 500 inspects the height of the hairpin 100 in the height direction through the image of the lateral imaging device 400.

However, before inspecting the hairpin 100 through the inspection controller 500, it is necessary to formulate an inspection standard that serves as a standard for quality inspection. The inspection controller 500 can form an inspection standard through the first axial imaging device 310 that performs the aforementioned zero point correction. That is, the first axial imaging device 310 photographs the stator 200 while performing zero point correction, and the inspection controller 500 calculates data from the image captured through the first axial imaging device 310. , Set inspection standards for hairpin (100) alignment based on the calculated data. Specifically, the inspection controller 500 predicts the midpoint of the stator 200 in a plane perpendicular to the rotation axis through the image captured by the first axial imaging device 310, and determines the predicted midpoint of the stator 200. As a standard, the inner diameter (R1) of the stator 200 and the distance (R2) from the midpoint of the stator 200 to the end of each slot 210 are calculated as data.

Referring to FIG. 3, the first axial imaging device 310 rotates so as to capture images of each slot 210 formed in the stator 200. At this time, based on the image captured through the first axial imaging device 310, the inspection controller 500 can predict the position of the rotation axis, that is, the midpoint of the stator 200. The inspection controller 500 determines the inner diameter R1 of the stator 200 and the midpoint of the stator 200 through the image captured by the first axial imaging device 310 based on the predicted position of the midpoint of the stator 200. The distance (R2) from to the end of each slot 210 can be calculated. And the inspection controller 500 stores the calculated inner diameter (R1) of the stator 200 and the distance (R2) from the midpoint of the stator 200 to the end of the slot 210 as data, and then uses the stored data as data for the second axis. It is used as an inspection standard when inspecting the alignment of the hairpin 100 based on the image captured through the directional imaging device 320.

When the zero point correction is completed through the first axial imaging device 310 and the calculation of the data that becomes the inspection standard is completed in the inspection controller 500, the stator ( The alignment of the hairpin 100 inserted into 200) is checked. The inspection controller 500 inspects the alignment gap of the legs of the hairpin 100 through the image of the axial imaging device 300 during the inserting, widening, twisting, or cutting process of the hairpin 100. Specifically, the inspection controller 500 detects a plurality of hairpin 100 legs located in the slot 210 through the image of the axial imaging device 300 during the inserting, widening, twisting, or cutting process of the hairpin 100. Check the vertical or left-right alignment gap between the liver.

4 to 9 are inspection images of images captured through an axial imaging device for each process according to an embodiment of the present invention. FIG. 4 shows the inserting process of the hairpin 100, FIG. 5 shows the widening process of the hairpin 100, FIG. 6 shows the twisting process of the hairpin 100, and FIG. 7 shows the cutting process of the hairpin 100. This is an inspection image inspected through the image of the axial imaging device 300. Referring to FIG. 4, the inspection controller 500 inspects the vertical alignment gap or left and right alignment gap between the legs of a plurality of hairpins 100 when the hairpin 100 is inserted into the slot 210 of the stator 200. As the midpoint of the stator 200 was previously predicted through the first axial imaging device 310, the x-axis of the hairpin 100 inserted into the slot 210 is shown in the image captured through the second axial imaging device 320. And a baseline in the y-axis direction may be formed. The inspection controller 500 inspects the vertical alignment interval or left and right alignment interval between the legs of the plurality of hairpins 100 inserted into the slot based on the formed reference lines of the x-axis and y-axis. Through this, it is possible to check whether the hairpin 100 is properly inserted into the slot 210 of the stator 200 during the inserting process of the hairpin 100.

Referring to FIG. 5, the inspection controller 500 inspects the vertical alignment gap or left and right alignment gap between the legs of the plurality of hairpins 100 when the hairpin 100 is widened. When widening the hairpin 100, the plurality of hairpins 100 are widened in pairs to perform the subsequent process. At this time, based on the image captured through the axial imaging device 300, the inspection controller 500 demarcates the movement range of the paired hairpin 100 after widening through data that serves as an inspection standard. Then, the inspection controller 500 determines the position of the paired hairpins 100 within the demarcated movement range and inspects the upper and lower alignment intervals or the left and right alignment intervals. Additionally, the inspection controller 500 inspects the widened left and right alignment intervals between the paired hairpins 100. Through this, it is possible to check whether the widening state of the hairpin 100 is abnormal before performing the subsequent process in the widening process of the hairpin 100.

Referring to FIG. 6, the inspection controller 500 inspects the left and right alignment intervals between the legs of the plurality of hairpins 100 when the hairpin 100 is twisted. When the hairpin 100 is twisted, one of the paired hairpins 100 in the image of FIG. 5 moves to the position of one of the paired hairpins 100 located in another neighboring slot 210. Even after the hairpin 100 is twisted, the range of the hairpin 100 leg is designated as shown in the image of FIG. 5, and the inspection controller 500 determines the left and right lengths of the paired hairpin 100 legs and the hairpin 100 within the range. Check the left and right alignment gap between legs. Through this, it is possible to check for abnormalities when performing the twisting process of the hairpin 100.

Referring to FIG. 7, when the hairpin 100 is cut, the inspection controller 500 inspects the vertical alignment gap or the left and right alignment gap between the legs of the plurality of hairpins 100. The process of cutting the hairpin 100 involves applying a physical external force to the hairpins 100 aligned after the twisting process of the hairpin 100. When a physical external force is applied, a problem may occur in which the alignment of the hairpin 100 is misaligned during the cutting process of the hairpin 100. Therefore, during the cutting process of the hairpin 100, based on the image captured through the axial imaging device 300, the inspection controller 500 determines the vertical alignment interval or left and right alignment interval of the newly paired hairpin 100 leg after twisting. inspect. Additionally, the inspection controller 500 also inspects the left and right alignment intervals between the legs of the paired hairpins 100. Through this, it is possible to check whether the alignment of the legs of the hairpin 100 is abnormal when performing a cutting process of the hairpin 100 in which physical force is applied.

Additionally, the inspection controller 500 inspects the size, location, and distance between welds through the image of the axial imaging device 300 during the welding process of the hairpin 100. 8 and 9 are inspection images captured through the axial imaging device 300 during the welding process of the hairpin 100. The welding process involves welding paired hairpin 100 legs among the plurality of hairpin 100 legs, and the inspection controller 500 focuses on inspecting the welded portion. In particular, the inspection controller 500 inspects the size and position of the weld zone using images captured through the axial imaging device 300. If the size of the weld part is too large, connection between the weld parts may occur, and if the size of the weld part is too small, the connection between the legs of the hairpin 100 may be unstable. And, if the position of the welded part is formed outside the position of the hairpin 100 leg, problems may occur when later mounted on the hairpin motor. Therefore, the inspection controller 500 can inspect the size and position of the weld zone to check for abnormalities after performing the welding process of the hairpin 100. Additionally, the inspection controller 500 can check for abnormalities after the welding process of the hairpin 100 is performed by inspecting the distance between welded parts.

Meanwhile, the inspection controller 500 can inspect the hairpin 100 inserted into the stator 200 through images captured not only by the axial imaging device 300 but also by the lateral imaging device 400. Specifically, the inspection controller 500 uses the image of the lateral imaging device 400 during the twisting or cutting or welding process of the hairpin 100 to determine the twisting angle of the leg of the hairpin 100 or the height of the cutting portion and decoating portion or Check the height of the weld. 10 and 11 are inspection images of images captured through a lateral imaging device for each process according to an embodiment of the present invention. 10 and 11 are inspection images of images captured through the lateral imaging device 400 after the twisting process and cutting process of the hairpin 100. Referring to FIG. 10, the inspection controller 500 inspects the angle of the leg of the twisted hairpin 100. And the inspection controller 500 inspects the height of the decoating portion of the cut leg of the hairpin 100. The hairpins 100 are connected to each other through welding, and in order to be connected through welding, there is a decoating portion in which the coating surrounding the hairpin 100 has been peeled off at the end of the leg of the hairpin 100. The inspection controller 500 checks whether the height of the decoating portion is appropriate for welding by checking the end of the cut leg of the hairpin 100 before the welding process is performed after the cutting process of the hairpin 100. Referring to FIG. 11, the inspection controller 500 inspects the height of the cut leg of the hairpin 100. The cutting process of the hairpin 100 involves physical force, which directly affects the alignment of the hairpin 100. Therefore, the inspection controller 500 can check for abnormalities in the cutting process by inspecting the height of the cut leg of the hairpin 100 after the cutting process.

Additionally, the axial imaging device 300 and the lateral imaging device 400 can photograph not only the process after the hairpin 100 is inserted into the stator 200 but also the process before the hairpin 100 is inserted. Additionally, the inspection controller 500 may also perform an inspection based on images captured through the axial imaging device 300 and the lateral imaging device 400 before the hairpin 100 is inserted. Specifically, after the insulation paper is inserted into the stator 200, the inspection controller 500 inspects the thickness and shape of the insulation paper located in the slot 210 in a plane perpendicular to the rotation axis through the image of the axial imaging device 300. do. And after the insulation paper is inserted into the stator 200, the inspection controller 500 inspects the height of the insulation paper exposed to the outside in the height direction through the image of the lateral imaging device 400.

12 to 13 are inspection images captured through an axial imaging device and a lateral imaging device when inserting insulation paper according to an embodiment of the present invention. Figure 12 is an image in which the inspection controller 500 checks the thickness and shape of the insulating paper based on the image captured by the axial imaging device 300 when the insulating paper is inserted. In the process of inserting insulating paper, since the insulating paper is just paper, it can be accurately inserted into the slot 210, but its shape may be distorted. The inspection controller 500 checks whether the insulating paper is correctly positioned in the slot 210 by inspecting the shape or thickness of the insulating paper inserted into the slot 210. Figure 13 is an image of the inspection controller 500 checking the height of the insulation paper based on the image captured by the lateral imaging device 400 when the insulation paper is inserted. When the insulating paper is inserted into the slot, a portion of the insulating paper is exposed to the upper or lower surface of the stator 200. As the length of the exposed insulating paper increases, problems that affect the process after the hairpin 100 is inserted may occur. Therefore, the inspection controller 500 needs to check the image captured through the lateral imaging device 400 and inspect the height of the insulating paper exposed at both ends of the slot 210 of the stator 200.

In other words, if a problem occurs during the process of inserting the insulating paper, continuous problems may occur during the subsequent process of inserting the hairpin 100. Therefore, the inspection controller 500 needs to check the insertion state of the insulating paper based on images captured through the axial imaging device 300 and the lateral imaging device 400 even in the insulating paper insertion process.

According to the hairpin motor quality inspection system of the present invention, the hairpin inserted into the stator is photographed using an axial imaging device and a lateral imaging device, and the alignment and height of the hairpin are checked in a non-contact manner based on the photographed image. It is effective in preventing quality deterioration due to physical contact during quality inspection.

In addition, by checking the alignment and height of the hairpin in each production process of the hairpin motor, defects in each process can be identified and responded to in advance, which has the effect of improving the productivity of the hairpin motor.

Although the present invention has been shown and described in relation to specific embodiments, it is known in the art that various improvements and changes can be made to the present invention without departing from the technical spirit of the present invention as provided by the following claims. This will be self-evident to those with ordinary knowledge.

100: hairpin
200: stator
210: slot
300: Axial imaging device
310: First axis imaging device
320: Second axis imaging device
400: Lateral imaging device
500: inspection controller
600: motor
700: Motor controller
800: index

Claims (13)

An axial imaging device provided above or below the rotation axis of the stator to photograph the upper or lower surface of the stator;
A lateral imaging device provided on the side of the stator to photograph the side of the stator; and
For each process of manufacturing a stator, images are captured through an axial imaging device and a lateral imaging device. The alignment of the hairpins on a plane perpendicular to the rotation axis is inspected through the images from the axial imaging device, and the images from the lateral imaging device are inspected. A hairpin motor quality inspection system including an inspection controller that inspects the height of the hairpin in the height direction. In claim 1,
A hairpin motor quality inspection system characterized in that the axial imaging device and the lateral imaging device photograph the leg side of the hairpin that is inserted into the stator and exposed to the outside. In claim 1,
When shooting a stator through an axial imaging device and a lateral imaging device, if the stator is fixed, the axial imaging device and the lateral imaging device rotate around the rotation axis to capture images, and if the stator rotates based on the rotation axis, the axial imaging device and the lateral imaging device take photos. A hairpin motor quality inspection system characterized by filming while the device is fixed. In claim 3,
A motor that performs rotation of the stator or rotation of the axial imaging device and the lateral imaging device; and
It further includes a motor controller that calculates a rotation angle according to the stator and controls the motor to rotate at each calculated rotation angle,
A hairpin motor quality inspection system wherein the rotation angle is calculated according to the number of slots formed in the stator. In claim 1,
The axial imaging device includes a first axial imaging device that performs zero point correction; and
Hairpin motor quality inspection, characterized in that it consists of a second axial imaging device that operates in the same manner as the first axial imaging device and photographs the alignment of the hairpins of the stator when zero point correction through the first axial imaging device is completed. system. In claim 5,
The first axial imaging device photographs the stator while performing zero point correction, and the inspection controller calculates data from the images captured through the first axial imaging device and sets inspection standards for hairpin alignment based on the calculated data. Hairpin motor quality inspection system characterized by: In claim 6,
The inspection controller predicts the midpoint of the stator on a plane perpendicular to the rotation axis through the image captured by the first axial imaging device, and based on the predicted midpoint of the stator, the inner diameter of the stator and the distance from the midpoint of the stator to the end of each slot A hairpin motor quality inspection system characterized by calculating the distance as data. In claim 1,
A hairpin motor quality inspection system characterized in that the inspection controller inspects the alignment gap of the hairpin legs through images from an axial imaging device during the inserting, widening, twisting, or cutting process of the hairpin. In claim 8,
The inspection controller is a hairpin motor quality characterized in that it inspects the vertical alignment gap or left and right alignment gap between a plurality of hairpin legs located in the slot through the image of an axial imaging device during the inserting, widening, twisting, or cutting process of the hairpin. Inspection system. In claim 1,
The inspection controller is a hairpin motor quality inspection system characterized by inspecting the size, position, and distance between welds through images from an axial imaging device during the hairpin welding process. In claim 1,
The inspection controller is a hairpin motor quality inspection system characterized by inspecting the twisting angle of the hairpin leg, the height of the cutting part and decoating part, or the height of the welding part through the image of the lateral imaging device during the twisting or cutting or welding process of the hairpin. . In claim 1,
A hairpin motor quality inspection system characterized in that the inspection controller inspects the thickness and shape of the insulating paper located in the slot in a plane perpendicular to the rotation axis through the image of the axial imaging device after the insulating paper is inserted into the stator. In claim 1,
The inspection controller is a hairpin motor quality inspection system characterized by inspecting the height of the insulation paper exposed to the outside in the height direction through the image of a lateral imaging device after the insulation paper is inserted into the stator.

Images