KR20230057093A - Inspection apparatus for stator coil - Google Patents

Abstract

An embodiment of the present invention relates to an inspection device of a stator coil for inspecting protruding height of a plurality of hairpin end parts constituting a stator coil. According to one embodiment of the present invention, the inspection device of a stator coil is inserted into a slot of the stator coil to inspect the protruding height of the plurality of hairpin end parts protruding to one end of the slot. Provided is the inspection device of a stator coil, which comprises: a frame for mounting a sensor provided to be movable from the outside of a stator core to an upper portion of the stator coil; and a sensor provided to the frame for mounting the sensor to measure the protruding height of the plurality of hairpin end parts arranged in a radial direction of the stator core.

Description

Inspection device for stator coil {INSPECTION APPARATUS FOR STator COIL}

An embodiment of the present invention relates to a stator coil inspection device for inspecting protruding heights of a plurality of hairpin ends constituting a hairpin type stator coil.

In general, an electric vehicle called an eco-friendly vehicle may generate driving force by an electric motor that obtains rotational force with electrical energy.

An electric vehicle runs in an EV (Electric Vehicle) mode, which is a pure electric vehicle mode using only power from an electric motor, or in a hybrid electric vehicle (HEV) mode using both an engine and a drive motor as power.

Most electric motors used as a power source for electric vehicles use a permanent magnet synchronous motor (PMSM).

An electric motor as a permanent magnet synchronous motor used as a power source of such an electric vehicle is basically composed of a stator generating magnetic flux, and a rotor disposed with a predetermined air gap from the stator and provided with a permanent magnet to perform rotational motion. .

Meanwhile, it is known that the output of an electric motor is proportional to the number of turns of a coil wound around a stator core. However, when the number of turns of the coil is increased, the size of the stator core or the electric motor itself including the stator core inevitably increases, making miniaturization difficult.

Therefore, in order to improve the output without increasing the size of the electric motor, the area ratio of the coil wound around the stator core is increased. That is, the dead space between the stator core and the winding coil or the dead space between coils can be minimized to increase the coil occupancy factor.

Therefore, in recent years, instead of using an annular coil having a circular cross section as a coil winding, a rectangular coil (referred to as a “segment coil” in the industry) is used to reduce dead space and improve the occupancy rate, resulting in output compared to the same size. There is a trend to produce high electric motors.

In order to facilitate coil winding work of the prismatic coil, a plurality of separate hairpin-shaped (approximately U-shaped or V-shaped) stator coils are inserted into slots of the stator core, and stator coils radially adjacent to each other in the slots A method of welding the ends of the stator coils to make the individual stator coils fully energized has been proposed.

As described above, prior to the process of welding the ends of the stator coils inserted into the slots of the stator core, the ends of the stator coils protruding out of the slots of the stator core are moved in different directions for wiring of the stator coils and integration and miniaturization of the stator. Bits can perform a twisting process.

In order to improve workability and accuracy in the stator coil forming process, it is required to uniformly align stator coils, that is, ends of the hairpins that are inserted into the slots of the stator core and protrude outward.

In particular, since the twisting process is performed for each coil layer arranged in the circumferential direction of the stator core, it is important to have uniform protruding heights of hairpin ends arranged on the same coil layer.

However, conventionally, in the process of inserting a hairpin-type coil into the slot of the stator core, the protruding heights of the ends of the hairpin protruding out of the slot by the operator are non-uniform, resulting in reduced workability and process defects in the subsequent twisting process, etc. This resulted in product defects such as welding defects in the subsequent welding process.

Matters described in this background art section are prepared to enhance understanding of the background of the invention, and may include matters that are not prior art already known to those skilled in the art to which this technique belongs.

Republic of Korea Patent Registration No. 10-2023012 (2019.09.11.)

An embodiment of the present invention is inserted into the stator core and uniformly aligns the protruding heights of the stator coils that protrude out of the slot, that is, the ends of a plurality of hairpins to improve accuracy and workability in post-processes such as a twisting process, and prevent product defects in advance. It is to provide a stator coil inspection device capable of preventing

In addition, an embodiment of the present invention is to provide a stator coil inspection device capable of improving overall stator coil productivity by reducing the time required for a post-process by uniformly aligning a plurality of hairpin ends and supplying them to a post-process. .

In addition, the embodiment of the present invention can accurately inspect the protruding heights of a plurality of hairpin ends to identify hairpin ends with unsuitable protruding heights and readjust the protruding heights of the identified unsuitable hairpin ends, thereby improving accuracy and workability in subsequent processes. It is an object of the present invention to provide a stator coil inspection device that can further increase and minimize product defects.

According to one embodiment of the present invention, there is provided a stator coil inspection device for inspecting protruding heights of ends of a plurality of hairpins inserted into slots of a stator core and protruding to one end of the slots, wherein the stator coils are installed outside the stator core. a sensor mounting frame provided to be movable upward; and a sensor provided in the frame for mounting the sensor and measuring protruding heights of ends of a plurality of hairpins arranged in a radial direction of the stator core.

The inspection device according to the present embodiment may include a probe provided on the sensor mounting frame, one end of which is in contact with the measuring tip of the sensor, and the other end of which is in contact with the corresponding hairpin end tip when measuring the protrusion height of the plurality of hairpin ends. there is.

At this time, the measuring tip of the sensor may be configured as a spring return type.

In this embodiment, the sensors may be provided in plural along the radial direction of the stator core, and thus the probes may be provided in plural corresponding to the number of the sensors.

Meanwhile, the protruding heights of the ends of the plurality of hairpins arranged along the radial direction of the stator core may form a step shape in which the protruding heights increase from the inside to the outside of the stator core, and thus the protruding lengths of the other ends of the plurality of probes may be It may have a length corresponding to the stepped shape of the end.

The sensor may sequentially measure protruding heights of the plurality of hairpin ends while moving from the outside to the inside of the stator core.

Meanwhile, the frame for mounting the sensor may be connected to the robot arm and move via the robot arm.

Here, a rotation plate may be rotatably provided at an end of the robot arm, and the frame for mounting the sensor may be provided at an edge of the rotation plate.

In this case, an alignment tool for aligning the plurality of hairpin ends along with the sensor mounting frame in a line along the radial direction of the stator core may be provided at an edge of the rotation plate.

In this case, the frame for mounting the sensor may be spaced apart from the alignment tool at the edge of the rotation plate.

The inspection device according to the present embodiment may include a display unit that displays protrusion heights of the plurality of hairpin ends measured by the sensor, and the display unit determines whether the protrusion heights of the plurality of hairpin ends determined by the controller are OK (OK). Alternatively, nonconformity (NG) may be displayed for each of the plurality of hairpin ends.

Meanwhile, the sensor applied to the inspection device of the present embodiment may include a Linear Variable Differential Transformer (LVDT).

According to an embodiment of the present invention, by aligning the protruding heights of the hairpin ends of the stator coil uniformly and supplying the protruding heights to the subsequent process, accuracy and workability can be improved in the subsequent process such as the twisting process, and product defects can be prevented in advance. There is an advantage to being

In addition, according to an embodiment of the present invention, since the post process can be performed with the plurality of hairpin ends uniformly aligned, the time required for the post process can be reduced and the overall productivity of the stator coil can be improved.

In addition, according to an embodiment of the present invention, it is possible to accurately inspect the protruding heights of a plurality of hairpin ends to identify hairpin ends with unsuitable protruding heights, and readjust the protruding heights of the identified unsuitable hairpin ends to improve accuracy and workability in subsequent processes. There is an advantage in that product defects can be minimized by further increasing the product yield, thereby reducing manufacturing cost and manufacturing cost by increasing product yield.

1 is a front view schematically showing an alignment facility to which a stator coil inspection device according to an embodiment of the present invention is applied;
Figure 2 is a left side view of Figure 1
Figure 3 is a plan view of Figure 1
Figure 4 is a partially enlarged perspective view schematically showing the main part of Figure 1
5A is a plan view schematically showing a rotation plate and an inspection device rotatably provided at an end of a robot arm in the alignment facility of FIG. 1;
Figure 5b is a side view of Figure 5a
Figure 5c is a rear view of Figure 5a
Figure 5d is a configuration diagram schematically showing the main parts of the inspection device of Figure 5a
6A to 6B are configuration diagrams for explaining a process of measuring a protruding height of a hairpin end group through a stator coil inspection device according to an embodiment of the present invention.
7 is a flowchart schematically illustrating a process of an alignment facility to which a stator coil inspection device according to an embodiment of the present invention is applied.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The detailed descriptions that follow are provided to provide a comprehensive understanding of the methods, devices and/or systems described herein. However, this is only an example and disclosed embodiments are not limited thereto.

In describing the embodiments, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the disclosed embodiments, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the disclosed embodiments, which may vary according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout this specification. Terminology used in the detailed description is only for describing the embodiments and should in no way be limiting. Unless expressly used otherwise, singular forms of expression include plural forms. In this description, expressions such as "comprising" or "comprising" are intended to indicate any characteristic, number, step, operation, element, portion or combination thereof, one or more other than those described. It should not be construed to exclude the existence or possibility of any other feature, number, step, operation, element, part or combination thereof.

1 is a front view schematically showing an alignment facility to which a stator coil inspection device according to an embodiment of the present invention is applied, FIG. 2 is a left side view of FIG. 1, FIG. 3 is a plan view of FIG. 1, and FIG. It is a partially enlarged perspective view schematically showing the main part of 1. And, Figure 5a is a plan view schematically showing a rotation plate and an inspection device rotatably provided at the end of the robot arm in the alignment facility of Figure 1, Figure 5b is a side view of Figure 5a, Figure 5c is a rear view of Figure 5a 5d is a configuration diagram schematically showing the main parts of the inspection device of FIG. 5a. 6A to 6B are configuration diagrams for explaining a process of measuring a protruding height of a hairpin end group through a stator coil inspection device according to an embodiment of the present invention, and FIG. 7 is an embodiment of the present invention. It is a flowchart schematically showing the process of the alignment facility to which the stator coil inspection device according to is applied.

First, with reference to FIGS. 1 to 4 , equipment to which the stator coil inspection device according to an embodiment of the present invention is applied will be described in detail.

1 to 4, a facility 100 to which a stator coil inspection device according to an embodiment of the present invention is applied includes a main body base 110 and a stator core 11 into which stator coils 12 are inserted. ) is inserted and rotatably provided, and the stator core 11 provided outside the stator core 11 to be movable along the radial direction R of the stator core 11 A gripping unit 130 for supporting at least one hairpin end group 12a arranged in the radial direction R of and movably provided outside the stator core 11 via a robot arm 150 as a medium a horizontal alignment unit 140 for aligning the straightness of the hairpin end group 12a gripped by the gripping unit 130, a clamping unit 170 for supporting the stator core 11, and the hairpin It may include an inspection device 180 for inspecting the protruding height of the end group 12a, and a vertical alignment unit 160 for aligning the protruding height of the plurality of hairpin ends 12a-1.

The body base 110 is connected to a first base 111 on which the jig unit 120 and the gripping unit 130 are provided and one side of the first base 111, and the robot arm 150 ) may include a second base 112 provided. Here, the first base 111 is used to operate the jig unit 120, the gripping unit 130, the horizontal alignment unit 140, the vertical alignment unit 160, and the inspection device 180. A control unit 101 for manipulating and controlling various constituent units such as the robot arm 150 for the robot may be provided. Of course, the arrangement structure of the units provided on the first base 111 and the second base 112 is not limited to the above structure, and the units provided on the first base 111 and the second base The unit provided in 112 may be moved and arranged in various ways for efficient alignment of the stator coil 12, and the first base 111 and the second base 112 are integrally formed. could be

The jig unit 120 may include a rotation jig 121 on which the stator core 11 is mounted, and control components such as a motor (not shown) for rotating the rotation jig 121. That is, in the rotation jig 121, the stator core 11 is mounted for the alignment process of the stator coil 12 through the gripping unit 130 and the horizontal alignment unit 140. It can be rotated at a predetermined angle along the circumferential direction (C) of the stator core 11, and the rotation drive of the rotation jig 121 is driven by various driving parts for rotation such as a motor provided on the first base 111. At this time, the rotation driving may be interlocked with the gripping unit 130 and the horizontal alignment unit 140 by operation control through the control unit 101 .

The gripping unit 130 moves forward and backward along the radial direction R of the stator core 11 with the fixing plate 131 provided on the first base 111 outside the stator core 11. Possibly, when the moving plate 132 provided on the fixed plate 131 and the hairpin end group 12a provided at the end of the moving plate 132 are aligned, the circumferential direction of the corresponding hairpin end group 12a (C) may include a gripper 133 supporting both sides. Here, the gripper 133 is formed in the shape of tongs, and can support while primarily adjusting the alignment position by pushing the corresponding hairpin end group 12a along the radial direction R of the stator core 11. . At this time, since the gripper 133 may primarily come into contact with the hairpin end group 12a, it is preferable to be surface treated and/or coated to prevent damage to the surface of the coil. Of course, the gripper 133 may be formed of a hard resin material instead of a metal material to safely support the hairpin end group 12a. In addition, the operation of the gripping unit 130 may be interlocked with the jig unit 120 and the horizontal alignment unit 140 by operation control through the control unit 101 .

The horizontal alignment unit 140 includes a rotation plate 141 rotatably provided at the end 151 of the robot arm 150 and a gripping unit 130 provided at an edge of the rotation plate 141. ) That is, it may include first and second alignment tools 142a and 142b for aligning the straightness of the hairpin end group 12a supported by the gripper 133. Here, the first and second alignment tools 142a and 142b may be spaced apart from each other along the edge of the rotation plate 141, and the first alignment tool 142a is the hairpin end group 12a. The straightness of can be primarily adjusted, and the second alignment tool 142b can finely adjust the straightness of the hairpin end group 12a secondarily. More specifically, a first alignment chuck 142a-1 capable of gripping at least one hairpin end portion 12a-1 of the hairpin end group 12a may be provided below the first alignment tool 142a. can At this time, the first aligning chuck 142a-1 is spread in a direction substantially perpendicular to the radial direction of the stator core 11, that is, along the circumferential direction C, in a state of being inserted into the space between the hairpin end groups 12a. It is provided in a closed or closed form so that both sides of the at least one hairpin end 12a-1 can be held or placed, and the robot arm 150 rotates in various directions while holding the hairpin end 12a-1. It is possible to firstly adjust the at least one hairpin end 12a-1 in a row through the repeated operation of. In addition, a second alignment chuck 142b-1 similar to the first alignment chuck 142a-1 may be provided under the second alignment tool 142b. The second alignment chuck 142b-1 also opens or closes along the circumferential direction C substantially perpendicular to the radial direction of the stator core 11 in a state of being inserted into the space between the hairpin end groups 12a. It is provided to hold both sides of the at least one hairpin end 12a-1 or can be high, and through repeated operation of the robot arm 150 in various directions while holding the hairpin end 12a-1 2 Differentially, the at least one hairpin end 12a-1 may be fine-tuned in line.

Meanwhile, the first and second alignment tools 142a and 142b may be sequentially arranged in a direction opposite to the rotational direction of the rotation plate 141 . Accordingly, when the rotating plate 141 rotates in one direction while the horizontal alignment unit 140 is positioned above the hairpin end group 12a to be aligned, the first and second alignment tools 142a and 142b This may be sequentially applied to the hairpin end group 12a to sequentially perform an alignment process. In addition, since the first and second alignment chucks 142a-1 and 142b-1 can come into contact with the hairpin end group 12a, they are preferably surface-treated and/or coated to prevent damage to the coil surface. . Of course, the first and second alignment chucks 142a-1 and 142b-1 are also formed of a hard resin material instead of metal, so that the hairpin end group 12a can be held and aligned without damage. . In addition, the operation of the horizontal alignment unit 140 may also be interlocked with the jig unit 120 and the gripping unit 130 by operation control through the control unit 101 .

The vertical alignment unit 160 separates from the horizontal alignment unit 140 in the axial direction A of the stator core 11 in order to improve accuracy and workability during the post-processing of the stator coil 12 following the alignment process. ), protruding heights of the plurality of hairpin ends 12a-1 may be aligned. In particular, after the coil alignment process, the stator coil 12 is twisted for each coil layer arranged in the circumferential direction (C) of the stator core 11 for integration and miniaturization of the motor. At this time, the stator core 11 Since the circumferential rotation lengths of the coil layers are different from the inside to the outside in the radial direction (R) of It is desirable to form a step-wise alignment in which the height of the protrusion increases. Accordingly, the vertical alignment unit 160 operates from the hairpin end 12a-1 located inside the stator core 11 to the hairpin end 12a-1 located outside the stator core 11 for each hairpin end group 12a. You can arrange the protrusion height sequentially up to .

More specifically, the vertical alignment unit 160 is provided on the main body base 110 to vertically align the protruding heights of the plurality of hairpin ends 12a-1 arranged in each of the hairpin end groups 12a. A tool 161 may be included. Here, the vertical alignment tool 161 includes a guide part 161a that linearly reciprocates in the radial direction R of the stator core 11 from the upper outer side of the stator coil 12, and the guide part 161a ) It may be configured to include an alignment chuck part 161b provided at the bottom of the plurality of hairpin ends 12a-1 to adjust the protruding height of the plurality of hairpin ends 12a-1. At this time, the alignment chuck unit 161b may be linearly movable along the radial direction R of the stator core 11 and linearly reciprocally movable along the axial direction A of the stator core 11. And, it may be formed in the shape of a pair of tongs to hold or place one hairpin end 12a-1. Accordingly, the aligning chuck part 161b can adjust the protrusion height by holding the plurality of hairpin ends 12a-1 arranged in the hairpin end group 12a to be aligned one by one from the inside to the outside of the stator core 11. . At this time, the vertical alignment unit 160 may be installed at a distance from one side of the horizontal alignment unit 140, and operated separately or interlocked with the horizontal alignment unit 140 by operation control through the control unit 101. and can work together.

Additionally, the vertical alignment unit 160 includes a gripping unit 162 for vertical alignment support capable of stably supporting the hairpin end group 12a to be aligned during the alignment process of the vertical alignment tool 161. can do. Here, the gripping unit 162 for vertical alignment support may include a gripper 162b provided to be capable of linear reciprocating movement on the moving plate 162a, compared to the gripping unit 130 described above. Since the structure and operation are the same, a detailed description thereof will be omitted.

The clamping unit 170 includes rotation members 171 and 172 rotatably provided on the outside of the stator core 11 and rotatably provided at ends of the rotation members 171 and 172 to rotate the stator core. It may include a rotating roller 175 supporting the upper surface of (11). Here, the rotation members 171 and 172 are connected to a first plate 171 rotatably provided on the outside of the stator core 11 and a lower portion of the first plate 171, and the rotating roller ( 175) is provided between the second plate 172 provided at the protruding end and the first plate 171 and the second plate 172 to apply tension to the second plate 172 to rotate the rotating roller ( 175) may include tension adding means 173 and 174 for elastically contacting the upper surface of the stator core 11. In addition, the tension adding means 173 and 174 are provided on a bolt 173 connecting between the first plate 171 and the second plate 172 and on an outer circumferential surface of the bolt 173, When 173 is tightened, a coil spring 174 applying a tensile force to the second plate 172 may be included. At this time, the rotating roller 175 is preferably made of plastic, urethane or rubber.

5A to 5D, the inspection device 180 includes a fixed frame 181 installed on a rotation plate 141 rotatably provided at an end of the robot arm 150, and the fixed frame. A sensor mounting frame 182 provided at an end of 181, and a plurality of hairpin ends 12a- provided on the sensor mounting frame 182 and arranged in the radial direction R of the stator core 11 A sensor 183 for measuring the protruding height of 1) and the lower part of the frame 182 for mounting the sensor are provided so that one end is connected to the sensor 183 and the other end is connected to the hairpin end 12a-1 to be measured It may include a probe 184 to be contacted.

More specifically, the sensor 183 may be detachably provided on the sensor mounting frame 182 via an upper supporter 182a fixed to an upper portion of the sensor mounting frame 182, and the probe 184 may be detachably provided on the sensor mounting frame 182 via a lower supporter 182b at a lower portion of the sensor mounting frame 182 . At this time, the sensor 183 is provided in plurality, including a first sensor 183a located inside and a second sensor 183b located outside along the radial direction R of the stator core 11 By measuring the protruding heights of the plurality of hairpin ends 12a-1 at once, the measurement process can be performed more quickly. Accordingly, the probe 184 may also be provided in plurality including a first probe 184a and a second probe 184b corresponding to the sensor 183 . Here, further referring to FIGS. 6A and 6B , the protruding heights of the plurality of hairpin ends 12a-1 arranged along the radial direction R of the stator core 11 are the stator core 11 as described above. may form a stepped shape that increases from the inner side to the outer side of , and thus, the protruding length of the other end of the plurality of probes 184 may have a length corresponding to the stepped shape of the plurality of hairpin ends 12a-1. At this time, the measurement tips 183a-1 and 183b-1 of the first and second sensors 183a and 183b contact upper ends of the first and second probes 184a and 184b, and the first and second probes ( The measuring tips 184a-1 and 184b-1 of the 184a and 184b may contact tips of a plurality of adjacent hairpin ends 12a-1 of the hairpin end group 12a to be measured, respectively. Therefore, the inspection device 180 of the present embodiment can measure the protruding heights of the plurality of hairpin ends 12a-1 in an indirect contact method of the sensor 183 through the probe 184. Here, the sensor 183 may include a linear variable differential transformer (LVDT), and a measuring tip of the sensor 183 may be configured as a spring return type to respond to an external impact.

Meanwhile, the inspection device 180 may be disposed spaced apart from the horizontal alignment unit 140 at the edge of the rotation plate 141 . Thus, the inspection device 180 can measure the protruding heights of the plurality of hairpin ends 12a-1 belonging to the hairpin end group 12a after the alignment process of the horizontal alignment unit 140 has been completed. . At this time, the inspection device 180 moves from the outside to the inside of the stator core 11 via the robot arm 150, that is, while moving from the 6th layer to the 1st coil of the hairpin end group 12a. Protruding heights can be sequentially and quickly measured for each of the plurality (one pair) of hairpin ends 12a-1.

Meanwhile, the inspection device 180 of the present embodiment may include a display unit that displays protruding heights of the plurality of hairpin end portions 12a-1 measured by the sensor 183, and the display unit may include the control unit. (101) may be provided in the form of a monitor. In this case, the display unit may display whether the protruding heights of the plurality of hairpin ends 12a-1 determined by the controller (not shown) are OK (OK) or unsuitable (NG) for each of the plurality of hairpin ends.

Thereafter, as a result of the inspection by the inspection device 180, the position of the hairpin end having an improper protruding height (NG) among the plurality of hairpin ends 12a-1 is identified and aligned through the vertical alignment unit 160. By additionally performing the process, it is possible to readjust the protruding height of the unsuitable (NG) end of the hairpin.

On the other hand, the stator 10 may perform the above-described alignment process while the jig device 20 is provided to prevent deformation of the coil during the alignment process and improve workability. At this time, the jig device 20 includes a plurality of cuff jigs 21 inserted into the plurality of hairpin end groups 12a and supporting the plurality of hairpin ends 12a-1, and the plurality of cuff jigs 21 It may include a ring jig 22 provided on an edge of the kerf jigs 21 to fix the plurality of cuff jigs 21 to the stator core 11 . Of course, even in the process after the alignment process, the stator 10 may perform the process with the jig device 20 provided.

Hereinafter, the alignment process of the equipment to which the stator coil inspection device according to an embodiment of the present invention is applied will be described in more detail with reference to FIG. 7 and the structure of the above-described alignment equipment.

First, the alignment process includes the step of inserting the stator 10 (S10), and adjusting the protrusion height of the plurality of hairpin ends 12a-1 along the axial direction A of the stator core 10. (S31), adjusting the straightness of the plurality of hairpin end portions 12a-1 along the radial direction R of the stator core 10 (S32), and rotating the stator 10 while rotating the plurality of hairpin ends 12a-1. Adjusting the protruding height of the hairpin ends 12a-1 of (S31) and/or adjusting the straightness of the plurality of hairpin ends 12a-1 (S32) in the circumferential direction of the stator core 11 A step (S70) of aligning the coils of the stator 10 may be included by repeating step (C).

In this embodiment, the stator 10 may be inserted after the step of supporting the plurality of hairpin ends 12a-1 adjacent to the slot 11a with the jig device 20.

At this time, the step of supporting the plurality of hairpin ends 12a-1 includes supporting protruding portions of the plurality of hairpin ends 12a-1 adjacent to the slot 11a with a plurality of cuff jigs 21. and fixing the plurality of cuff jigs 21 to the stator core 11 by providing a ring jig 22 to the stator core 11 .

The coil alignment method according to the present embodiment is performed after the step of inputting the stator (S10) and includes a step (S20) of rotatably clamping the stator 10 through a clamping unit 170 during the coil alignment process. can

At this time, the stator 10 may be rotatably clamped by elastically compressing a portion of the upper surface of the edge of the stator core 11 with the rotary roller 175 of the clamping unit 170 .

Meanwhile, in the present embodiment, the step of adjusting the height of the protrusion of the plurality of hairpin ends 12a-1 (S31) and the step of adjusting the straightness of the plurality of hairpin ends 12a-1 are performed separately or together. It can be.

That is, the above-described vertical alignment unit 160 aligning the protruding height of the coil and the horizontal alignment unit 140 aligning the coil in straightness may be performed separately, and the vertical alignment unit 160 and the horizontal alignment may be performed separately. By operating the unit 140 interlockingly, the process of aligning the protruding height of the coil and the process of aligning the straightness of the coil may be performed together.

Here, the step of adjusting the protrusion height of the plurality of hairpin ends 12a-1 is one including the plurality of hairpin ends 12a-1 arranged along the radial direction R of the stator core 11. gripping the hairpin end group 12a of the hairpin end group 12a with a gripping unit 162 for vertical alignment support; It may include adjusting with the vertical alignment tool 161. At this time, the plurality of hairpin end portions 12a - 1 may have protruding heights adjusted in a stepwise manner such that the protruding height increases from the inside to the outside along the radial direction R of the stator core 11 .

In addition, the step of adjusting the straightness of the plurality of hairpin ends 12a-1 includes a plurality of hairpin ends 12-1 arranged along the radial direction R of the stator core 11. The step of gripping the hairpin end group 12a with the gripping unit 130, and the plurality of hairpin ends 12a-1 corresponding to the gripped hairpin end group 12a with first and second alignment tools ( It may include sequentially adjusting 142a and 142b) so that they are in line along the radial direction R of the stator core 11 . At this time, when adjusting the gripped hairpin end group 12a in a row, at least one hairpin end 12a-1 of the hairpin end group 12a is aligned with the first aligning tool 142a or the second aligning tool. 142b, and then repeating the process of reciprocating the first alignment tool 142a or the second alignment tool 142b in both directions substantially orthogonal to the radial direction R of the stator core 11. A plurality of hairpin ends 12a-1 can be aligned in a row.

Meanwhile, the coil alignment method of the stator according to the present embodiment may include measuring and inspecting protruding heights of the plurality of hairpin ends 12a-1 with the inspection device 180 (S40).

At this time, the measured values of the plurality of hairpin ends 12a-1 detected by the inspection device 180 may be monitored through the display unit of the control unit 101, that is, the monitor, and accordingly, the protruding height is inappropriate. The position of the hairpin end 12a-1, that is, the NG point can be identified and confirmed (S50).

As a result, among the plurality of hairpin ends 12a-1, the hairpin end 12a-1 having an improper protruding height (NG) rotates the stator 10 to perform an alignment process through the vertical alignment unit 160. By performing it again, the protruding height of the inappropriate hairpin end 12a-1 can be corrected and aligned again (S60).

Thereafter, the above-described process is repeatedly performed until all of the hairpin end groups 12a of the stator coil 12 are aligned in protrusion height and linearity. (S70)

Thus, when the alignment process of all hairpin end groups 12 constituting the stator coil 12 of the stator 10 is completed, the clamping unit 20 is released (S80) and the stator 10 inserted is taken out ( S90), the coil alignment process of the present embodiment can be completed. And, the drawn-out stator 10 can be put into a subsequent process.

Although representative embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications are possible to the above-described embodiments without departing from the scope of the present invention. . Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, and should be defined by not only the claims to be described later, but also those equivalent to these claims.

10: stator
11: stator core
12: stator coil
12a: hairpin end group
12a-1: hairpin end
20: jig device
21 : Cuff Jig
22 : Ring jig
100: stator coil alignment facility
101: control unit
110: body base
111: first base
112: second base
120: jig unit
121: rotation jig
130: gripping unit
131: fixed plate
132: moving plate
133: gripper
140: horizontal alignment unit
141: rotating plate
142a: first alignment tool
142a-1: first alignment chuck
142b: second alignment tool
142b-1: second alignment chuck
150: robot arm
151: robot arm end
160: vertical alignment unit
161: vertical alignment tool
162: gripping for vertical alignment support
170: clamping unit
171: first plate
172: second plate
173: Bolt
174: coil spring
175: rotating roller
176: roller support
180: inspection device
181: fixed frame
182: frame for sensor mounting
183: sensor
183a, 183b: first and second sensors
183a-1, 183b-1: Measurement tips of the first and second sensors
184: probe
184a, 184b: first and second probes
184a-1, 184b-1: Measuring tips of the first and second probes

Claims (10)

A stator coil inspection device for inspecting protruding heights of ends of a plurality of hairpins inserted into a slot of a stator core and protruding to one end of the slot,
a sensor mounting frame provided to be movable from an outside of the stator core to an upper portion of the stator coil; and
and a sensor provided in the frame for mounting the sensor and measuring protrusion heights of ends of a plurality of hairpins arranged in a radial direction of the stator core.
The method of claim 1,
A probe provided on the sensor mounting frame, one end of which is in contact with a measuring tip of the sensor, and the other end of which is in contact with a corresponding hairpin end tip when measuring the protrusion height of the plurality of hairpin ends.
The method of claim 2,
The measuring tip of the sensor is composed of a spring return type, the stator coil inspection device.
The method of claim 2,
The sensor is provided in plurality along the radial direction of the stator core,
The stator coil inspection apparatus is provided with a plurality of probes corresponding to the number of the sensors.
The method of claim 4,
The protruding heights of the ends of the plurality of hairpins arranged along the radial direction of the stator core form a stepped shape that increases from the inside to the outside of the stator core, and the protruding lengths of the other ends of the plurality of probes correspond to the stepped shape of the plurality of hairpin ends. An inspection device for a stator coil having a corresponding length.
The method of claim 1,
Wherein the sensor sequentially measures protruding heights of the plurality of hairpin ends while moving from the outside to the inside of the stator core.
The method of claim 1,
The sensor mounting frame is connected to a robot arm and is movable via the robot arm, a stator coil inspection device.
The method of claim 7,
A rotation plate rotatably provided at an end of the robot arm, and an alignment tool provided at an edge of the rotation plate to align the ends of the plurality of hairpins in a line along a radial direction of the stator core,
The sensor mounting frame is disposed at an edge of the rotating plate and spaced apart from the alignment tool.
The method of claim 1,
and a display unit displaying protruding heights of the plurality of hairpin ends measured by the sensor, wherein the display unit determines whether the protruding heights of the plurality of hairpin ends determined by the controller are suitable (OK) or unsuitable (NG) to the plurality of hairpin ends. A stator coil inspection device that marks each hairpin end.
The method according to any one of claims 1 to 9,
The sensor includes a linear variable differential transformer (LVDT), a stator coil inspection device.

Images