Patent Publication Number: US-2023155460-A1

Title: Method of manufacturing stator and device for manufacturing stator

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims the benefit under 35 USC § 119(a) of Korean Pat. Application No. 10-2021-0157551, filed on Nov. 16, 2021, in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. 
     BACKGROUND 
     1. Field 
     Exemplary embodiments relate to a method of manufacturing a stator and a device for manufacturing a stator and, more particularly, to a method of manufacturing a stator provided with a winding coil and a device for manufacturing the stator. 
     2. Description of Related Art 
     Motors converting electric energy into kinetic energy include stators and rotors. In order to enhance efficiency of such a motor and reduce energy loss that occurs in a coil wound around a stator, a space factor of the coil disposed in a stator core needs to be improved. 
     Also, according to the related art, in order to insert a coil into a stator core having slots, the coil in a wound state is mounted to a separate jig, and then, the jig is inserted into the slots of the stator core. Here, in order to prevent a thin film formed on a surface of the coil from contacting the stator core, a separate insertion member is provided between the stator core and the coil during insertion of the coil. 
     However, according to the related art, due to high stress that occurs while the coil is inserted into the stator core, the thin film of the coil becomes thinner, and insulation performance of the coil is deteriorated. Also, according to the related art, a considerable force is also applied to the separate insertion member described above during insertion of the coil, and thus, the insertion member needs to be replaced periodically. In addition, the thin film of the coil is scratched by the insertion member, and insulation performance of the coil is deteriorated. Also, according to the related art, when the slots of the stator core are designed, the size and assemblability of the insertion member as well as the outer diameter of the wound coil have to be taken into consideration. Thus, the sizes of the slots are increased, and overall performance of the motor is deteriorated. 
     SUMMARY 
     This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. 
     In one general aspect, there is provided a device for manufacturing a stator, the device including a winding jig configured to wind a coil and to manufacture a winding coil, and an insertion jig configured to receive the winding coil from the winding jig and to insert the winding coil into a stator core, wherein the winding jig comprises a body extending along a longitudinal direction (L1), a power supply unit configured to make the body revolve around a central shaft of the body, and a protrusion formed on a surface of the body. 
     The protrusion may have a closed curve shape that extends along a circumferential direction (C1) of the body. 
     The protrusion may have an open curve shape that extends along a circumferential direction (C1) of the body. 
     The protrusion may be provided in plurality, and the plurality of protrusions may be spaced apart from each other along the longitudinal direction (L1) of the body. 
     The protrusion may include an upper surface and a lower surface, and the upper surface may include an upper inclined section inclined downward in a width direction (R1) of the body. 
     The upper inclined section may be formed at an end of the upper surface away from the body in the width direction (R1). 
     The lower surface may include a lower horizontal section extending horizontally along the width direction (R1) of the body. 
     The insertion jig may include a first region having a first recessed portion disposed therein, and a second region coupled to one side of the first region and having a second recessed portion disposed therein. 
     Each of the first region and the second region may include an upper portion provided in each of upper zones of the first region and the second region, and a lower portion provided in each of the lower zones of the first region and the second region and may be connected to the upper portion, respectively, wherein the first recessed portion may be formed in the lower portion provided in the first region, and wherein the second recessed portion may be formed in the lower portion provided in the second region. 
     The first region and the first recessed portion may extend longitudinally in a radial direction (R2) of a virtual circle, and the second region and the second recessed portion may extend longitudinally in the radial direction (R2) of the virtual circle. 
     The first recessed portion or the second recessed portion may be configured such that an inner width (WI) of an inner region in the radial direction (R2) may be different from an inner width (WO) of an outer region in the radial direction (R2). 
     The first recessed portion or the second recessed portion may be configured such that an inner width (Wl) of an inner region in the radial direction (R2) may be greater than an inner width (WO) of an outer region in the radial direction (R2). 
     The first region or the second region may include a protrusion section formed at an end of the outer region in the radial direction (R2) and may protrudes toward the first recessed portion or the second recessed portion, respectively. 
     The protrusion section may be provided on each of two inner surfaces defining the first recessed portion in the first region, face each other in a circumferential direction (C2) of the virtual circle, or is provided on each of two inner surfaces defining the second recessed portion in the second region, face each other in the circumferential direction (C2) of the virtual circle. 
     The widths of two outer surfaces of the lower portion provided in the first region or the second region, may face each other in a circumferential direction (C2) of the virtual circle may be formed uniformly along the radial direction (R2) of the first region or the second region. 
     In another general aspect, there is provided a method of manufacturing a stator, the method including preparing a coil material and a stator core having a plurality of slots provided along a circumferential direction (C), forming a winding coil by rotating a winding jig after disposing the coil material on an outer surface of the winding jig, wherein one or more protrusion parts arranged along a longitudinal direction (L1) of a body are formed in the winding jig, transferring the winding coil from the winding jig to an insertion jig, wherein the insertion jig comprises a first region that has a first recessed portion having a recessed shape and a second region that has a second recessed portion having a recessed shape and is coupled to one side of the first region, and installing the winding coil into the slots after positioning the winding coil to a region above at least a portion of the plurality of slots, wherein the forming of the winding coil comprises accommodating the winding coil in the first recessed portion and the second recessed portion. 
     The installing of the winding coil may include lowering the winding coil into the slots by gravity. 
     The method may include forming a through-hole (G) in a central region of the stator core, and the plurality of slots communicate with the through-hole (G), wherein the installing of the winding coil may include lowering the winding coil into the slots after the winding coil is positioned to the inside of the through-hole (G). 
     The installing of the winding coil may include the stator core being configured such that the plurality of slots are arranged in a vertical direction, and the winding coil may move in a horizontal direction and is positioned to the inside of the through-hole (G). 
     The preparing of the coil material may include preparing the coil material using a first material and a second material provided separately from the first material, wherein the winding coil may include a first winding coil provided by winding the first material and a second winding coil provided by winding the second material. 
     The first winding coil and the second winding coil may be spaced apart from each other with the protrusion part therebetween. 
     Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention. 
         FIG.  1    is a perspective view illustrating a winding jig of a device for manufacturing a stator according to the present disclosure. 
         FIG.  2    is a side view illustrating the winding jig of the device for manufacturing a stator according to the present disclosure. 
         FIG.  3    is an enlarged side view illustrating a protrusion part formed in the winding jig according to the present disclosure. 
         FIG.  4    is a side view illustrating a state in which a winding coil is wound around the winding jig according to the present disclosure. 
         FIG.  5    is a view illustrating a state before an insertion jig of the device for manufacturing a stator according to the present disclosure enters a through-hole of a stator core. 
         FIG.  6    is a view illustrating a state after the insertion jig of the device for manufacturing a stator according to the present disclosure enters the through-hole of the stator core. 
         FIG.  7    is a perspective view illustrating the insertion jig of the device for manufacturing a stator according to the present disclosure. 
         FIG.  8    is a view illustrating a shape of a recessed portion formed in the insertion jig according to the present disclosure and illustrating a state in which winding coils are arranged inside recessed portions. 
         FIG.  9    is an enlarged view illustrating lower portions and protrusion sections of the insertion jig according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the disclosure of this application. For example, the sequences of operations described herein are merely examples, and are not limited to those set forth herein, but may be changed as will be apparent after an understanding of the disclosure of this application, with the exception of operations necessarily occurring in a certain order. Also, descriptions of features that are known may be omitted for increased clarity and conciseness. 
     The features described herein may be embodied in different forms, and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways of implementing the methods, apparatuses, and/or systems described herein that will be apparent after an understanding of the disclosure of this application 
     The terminology used herein is for the purpose of describing particular examples only and is not to be limiting of the examples. The singular forms “a”, “an”, and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises/comprising” and/or “includes/including” when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. 
     When describing the examples with reference to the accompanying drawings, like reference numerals refer to like constituent elements and a repeated description related thereto will be omitted. In the description of examples, detailed description of well-known related structures or functions will be omitted when it is deemed that such description will cause ambiguous interpretation of the present disclosure. 
     Also, in the description of the components, terms such as first, second, A, B, (a), (b) or the like may be used herein when describing components of the present disclosure. These terms are used only for the purpose of discriminating one constituent element from another constituent element, and the nature, the sequences, or the orders of the constituent elements are not limited by the terms. When one constituent element is described as being “connected”, “coupled”, or “attached” to another constituent element, it should be understood that one constituent element can be connected or attached directly to another constituent element, and an intervening constituent element can also be “connected”, “coupled”, or “attached” to the constituent elements. 
     Hereinafter, a device for manufacturing a stator and a method of manufacturing a stator according to the present disclosure will be described with reference to the drawings. 
     Device for Manufacturing a Stator 
       FIG.  1    is a perspective view illustrating a winding jig of a device for manufacturing a stator according to the present disclosure, and  FIG.  2    is a side view illustrating the winding jig of the device for manufacturing a stator according to the present disclosure.  FIG.  3    is an enlarged side view illustrating a protrusion part formed in the winding jig according to the present disclosure, and  FIG.  4    is a side view illustrating a state in which a winding coil is wound around the winding jig according to the present disclosure. 
     Referring to  FIGS.  1  to  4   , the device for manufacturing a stator according to the present disclosure may include a winding jig  100  that winds a coil and manufactures a winding coil. The winding jig  100  may include a body  110  extending along a longitudinal direction L1 and including a central shaft  112 , a power supply unit (not shown) that makes the body  110  revolve around the central shaft  112  of the body  110 , and a protrusion part  130  formed on a surface of the body  110  and protruding outward. 
     The body  110  may have a quadrangular pillar shape except for the central shaft  112  as illustrated in  FIGS.  1  to  4   . However, the body  110  may have various shapes such as a cylindrical shape unlike those illustrated in  FIGS.  1  to  4   . 
     The protrusion part  130  may be configured such that a plurality of winding coils  400  provided separately are spaced apart from each other along the longitudinal direction L1 of the body  110  as illustrated in  FIG.  4   . Thus, according to the present disclosure, the plurality of winding coils  400  may be space apart from each other with the protrusion part  130  therebetween. 
     The protrusion part  130  is provided on the surface of the body  110  and may have a shape extending along a circumferential direction C1 of the body  110 . Here, according to an example of the present disclosure, the protrusion part  130  may be formed only in a portion of the circumference of the body  110  as illustrated in  FIGS.  1  and  2   . This may be understood as meaning that the protrusion part  130  has an open curve shape extending along the circumferential direction C1 of the body  110 . For example, when the body  110  has a quadrangular pillar shape, the protrusion part  130  may be formed on only a portion of the four surfaces formed along the circumferential direction C1 of the body  110 .  FIGS.  1  and  2    illustrate, as an example, a state in which protrusion parts  130  are formed on the two facing surfaces among the four surfaces formed along the circumferential direction C1 of the body  110 . 
     However, according to another example of the present disclosure unlike that described above, the protrusion part  130  may have a closed curve shape extending along the circumferential direction C1 of the body  110 . For example, when the body  110  has a quadrangular pillar shape, the protrusion parts  130  may be formed on all of the four surfaces formed along the circumferential direction C1 of the body  110 , and the protrusion parts  130  formed on the respective surfaces may be connected to each other. 
     Continuing to refer to  FIGS.  1  to  4   , the protrusion part  130  may be provided in plurality. More specifically, the plurality of protrusion parts  130  may be spaced apart from each other along the longitudinal direction L1 of the body  110 .  FIGS.  1  and  2    illustrate, as an example, a state in which five protrusion parts  130  are provided at equal intervals along the longitudinal direction L1 of the body  110 , but the number of the protrusion parts  130  is not limited to that illustrated in the drawing. 
     Also, as illustrated in  FIG.  3   , the protrusion part  130  may include an upper surface  132  and a lower surface  134 . Here, the upper surface  132  may include an upper horizontal section  132   a  which extends horizontally along a width direction R1 of the body  110  and an upper inclined section  132   b  which is inclined downward toward the outside in the width direction R1 of the body  110 . The lower surface  134  may include a lower horizontal section  134   a  which extends horizontally along the width direction R1 of the body  110  and a lower inclined section  134   b  which is inclined upward toward the outside in the width direction R1 of the body  110 . More specifically, the upper horizontal section  132   a  and the lower horizontal section  134   a  described above may meet perpendicularly the body  110 . The upper inclined section  132   b  and the lower inclined section  134   b  may be connected to the upper horizontal section  132   a  and the lower horizontal section  134   a , respectively, and may be formed at an outer end of the upper surface in the width direction R1 of the body  110 . Thus, as illustrated in  FIG.  3   , the outer edge region of the protrusion part  130  in the width direction R1 may have a curved shape. This is to minimize damage to the winding coil due to the protrusion part  130 . 
       FIG.  5    is a view illustrating a state before an insertion jig of the device for manufacturing a stator according to the present disclosure enters a through-hole of a stator core, and  FIG.  6    is a view illustrating a state after the insertion jig of the device for manufacturing a stator according to the present disclosure enters the through-hole of the stator core.  FIG.  7    is a perspective view illustrating the insertion jig of the device for manufacturing a stator according to the present disclosure, and  FIG.  8    is a view illustrating a shape of a recessed portion formed in the insertion jig according to the present disclosure and illustrating a state in which winding coils are arranged inside recessed portions. Also.  FIG.  9    is an enlarged view illustrating lower portions and protrusion sections of the insertion jig according to the present disclosure. 
     Referring to  FIGS.  5  to  9   , the device for manufacturing a stator according to the present disclosure may include an insertion jig  200  which receives the winding coil  400  from the winding jig  100  (see  FIG.  1   , etc.) and inserts the winding coil  400  into a stator core  300 . 
     According to the present disclosure, the insertion jig  200  may be divided into a plurality of regions. More specifically, the insertion jig  200  may include a first region  210 , a second region  220  coupled to one side of the first region  210 , a third region  230  coupled to one side of the second region  220 , and a fourth region  240  coupled to one side of the third region  230 . The insertion jig  200  may have a structure in which the first to fourth regions  210 ,  220 ,  230 , and  240  are individually manufactured and then assembled. On the other hand, the first to fourth regions  210 ,  220 ,  230 , and  240  may be integrally formed. 
     Here, according to the present disclosure, a first recessed portion  211  having an upwardly recessed shape may be formed in the first region  210 , and a second recessed portion  221  having an upwardly recessed shape may be formed in the second region  220 . Also, a third recessed portion  231  having an upwardly recessed shape may be formed in the third region  230 , and a fourth recessed portion  241  having an upwardly recessed shape may be formed in the fourth region  240 . 
     The recessed portions  211 ,  221 ,  231 , and  241  formed in the insertion jig  200  may form spaces for accommodating the winding coil  400  provided from the winding jig  100 . 
     More specifically, each of the first to fourth regions  210 ,  220 ,  230 , and  240  may include an upper portion  202  provided in each of upper zones of the first to fourth regions  210 ,  220 ,  230 , and  240  and a lower portion  204  provided in each of the lower zones of the first to fourth regions  210 ,  220 ,  230 , and  240  and connected to the upper portion  202 . For example, the upper portion  202  and the lower portion  204  may have different widths.  FIGS.  5  to  7    illustrate a state in which the width of the upper portion  202  is greater than the width of the lower portion  204 . 
     Also, the first recessed portion  211  may be formed in a lower surface of the lower portion  204  provided in the first region  210 , a second recessed portion  221  may be formed in a lower surface of the lower portion  204  provided in the second region  220 , a third recessed portion  231  may be formed in a lower surface of the lower portion  204  provided in the third region  230 , and a fourth recessed portion  241  may be formed in a lower surface of the lower portion  204  provided in the fourth region  240 .  FIGS.  5  to  7    illustrate, as an example, a state in which the first to fourth recessed portions  211 ,  221 ,  231 , and  241  extend to the upper portions  202  provided in the first to fourth regions  210 ,  220 ,  230 , and  240 , respectively. On the other hand, the first to fourth recessed portions  211 ,  221 ,  231 , and  241  may be formed only in the lower portions  204  provided in the first to fourth regions  210 ,  220 ,  230 , and  240 , respectively. 
     Also, as illustrated in  FIGS.  5  to  7   , the first to fourth regions  210 ,  220 ,  230 , and  240  provided in the insertion jig  200  according to the present disclosure may be sequentially arranged along a circumferential direction C2 of a virtual circle A. In this case, the inner regions of the first to fourth regions  210 ,  220 ,  230 , and  240  may be arranged toward the center of the virtual circle A, and the first to fourth regions  210 ,  220 ,  230 , and  240  may be arranged in parallel to a radial direction R2 of the virtual circle A. 
     More specifically, the first region  210  and the first recessed portion  211  may extend longitudinally in the radial direction R2 of the virtual circle A, and the second region  220  and the second recessed portion  221  may extend longitudinally in the radial direction R2 of the virtual circle A. Also, the third region  230  and the third recessed portion  231  may extend longitudinally in the radial direction R2 of the virtual circle A, and the fourth region  240  and the fourth recessed portion  241  may extend longitudinally in the radial direction R2 of the virtual circle A. 
     Also, according to the present disclosure, widths of the recessed portions formed in the insertion jig may be different from each other depending on the regions. 
     More specifically, the first to fourth recessed portions  211 ,  221 ,  231 , and  241  may be configured such that an inner width Wl of an inner region in the radial direction R2 of the virtual circle A is different from an inner width WO of an outer region in the radial direction R2 of the virtual circle A. More preferably, the first to fourth recessed portions  211 ,  221 ,  231 , and  241  may be configured such that the inner width Wl of the inner region in the radial direction R2 of the virtual circle A is greater than the inner width WO of the outer region in the radial direction R2 of the virtual circle A. 
     As described above, in the device for manufacturing a stator according to the present disclosure, the insertion jig  200  may receive the winding coil  400  from the winding jig  100 . Here, the winding coil  400  may have the numbers of wires, which are different from each other depending on regions. Herein, the number of wires represents the number of strands in coils which are arranged along the width direction of the winding coil. 
     More specifically, according to the present disclosure, in the winding coil  400  accommodated in the recessed portions  211 ,  221 ,  231 , and  241  of the insertion jig  200 , the number of wires in a portion positioned in the inner region in the radial direction R2 may be greater than the number of wires in a portion positioned in the outer region in the radial direction R2. In  FIG.  8   , regions of the winding coil  400  passing through the page of the drawing are shown as circles for convenience of description. Based on the above,  FIG.  8    illustrates, as an example, a case in which the number of wires in the winding coil is one in a portion positioned in the outer region in the radial direction R2 (that is, a region corresponding to WO), and the number of wires in the winding coil is two in a portion positioned in the inner region in the radial direction R2 (that is, a region corresponding to Wl). 
     Continuing to refer to  FIG.  9   , each of the first to fourth regions  210 ,  220 ,  230 , and  240  may include a protrusion section  206  which is formed at an end of the outer region in the radial direction R2 and protrudes toward the first to fourth recessed portions  211 ,  221 ,  231 , and  241 . 
     More specifically, according to the present disclosure, the protrusion section  206  may be provided on each of two inner surfaces which, among inner surfaces defining the first recessed portion  211  in the first region  210 , face each other in the circumferential direction C2 of the virtual circle A, or may be provided on each of two inner surfaces which, among inner surfaces defining the second recessed portion  221  in the second region  220 , face each other in the circumferential direction C2 of the virtual circle A. Also, the protrusion section  206  may be provided on each of two inner surfaces which, among inner surfaces defining the third recessed portion  231  in the third region  230 , face each other in the circumferential direction C2 of the virtual circle A, or may be provided on each of two inner surfaces which, among inner surfaces defining the fourth recessed portion  241  in the fourth region  240 , face each other in the circumferential direction C2 of the virtual circle A. 
     That is, as described above, the first to fourth recessed portions  211 ,  221 ,  231 , and  241  may be configured such that the inner width Wl of the inner region in the radial direction R2 of the virtual circle A is greater than the inner width WO of the outer region in the radial direction R2 of the virtual circle A. This is because the protrusion sections  206  are formed at the end of the outer region in the radial direction R2. That is, according to the present disclosure, the inner width WO of the outer region of the first to fourth recessed portions  211 ,  221 ,  231 , and  241  in the radial direction R may be defined as the distance between two neighboring protrusion sections  206 . 
     Also, as illustrated in  FIGS.  7  to  9   , according to an example, each of widths of two outer surfaces which, among outer surfaces of the lower portion  204  provided in each of the first to forth regions  210 ,  220 ,  230 , and  240 , face each other in the circumferential direction C2 of the virtual circle A may be formed uniformly along the radial direction R2 of the first to forth regions  210 ,  220 ,  230 , and  240 . 
     Method of Manufacturing a Stator 
     Referring to  FIGS.  1  to  9   , a method of manufacturing a stator according to the present disclosure may include: a preparation process of preparing a coil material and a stator core  300  having a plurality of slots S provided along a circumferential direction C; a winding process of forming a winding coil  400  by rotating a winding jig  100  after disposing the coil material on an outer surface of the winding jig  100 , wherein one or more protrusion parts  130  arranged along a longitudinal direction L1 of a body  110  are formed in the winding jig  100 ; a transfer process of transferring the winding coil  400  from the winding jig  100  to an insertion jig  100 , wherein the insertion jig  200  includes a first region  210  that has a first recessed portion  211  having a recessed shape and a second region  220  that has a second recessed portion  221  having a recessed shape and is coupled to one side of the first region  210 ; and an insertion process of falling the winding coil  400  into the slots S after positioning the winding coil  400  to a region above at least a portion of the plurality of slots S. 
     Particularly, in the insertion process described above, the winding coil  400  may fall into the slots S by gravity. Thus, according to the present disclosure, the winding coil  400  may be inserted into the slots S without receiving separate external power in the insertion process, and thus, it is possible to prevent the winding coil  400  from being damaged while the winding coil  400  is inserted into the slots S of the stator core  300 . 
     More specifically, a through-hole G may be formed in a central region of the stator core  300 , and the plurality of slots S may communicate with the through-hole G. Here, in the insertion process in the method of manufacturing a stator according to the present disclosure, the winding coil  400  may fall into the slots S after the winding coil  400  is positioned to the inside of the through-hole G. That is, referring to  FIGS.  5  and  6   , the insertion jig  200 , in which the winding coil is inserted, may be positioned in the outside of the through-hole G prior to the insertion process as illustrated in  FIG.  5   . In the insertion process, the insertion jig  200 , in which the winding coil is inserted, may be positioned in the inside of the through-hole G as illustrated in  FIG.  6   . More preferably, the insertion jig  200  and the winding coil may move in parallel to the page in the insertion process. For this, as illustrated in  FIGS.  5  and  6   , in the insertion process, the stator core  300  may be configured such that the plurality of slots S are arranged in a vertical direction. In the insertion process, the winding coil moves in a horizontal direction and may be positioned to the inside of the through-hole G. 
     Also, in the preparation process in the method of manufacturing a stator according to the present disclosure, the coil material may be prepared which includes a first material and a second material provided separately from the first material. Here, in the winding process, the winding coil  400  may be provided which includes a first winding coil  410  provided by winding the first material and a second winding coil  420  provided by winding the second material. Moreover, according to the present disclosure, in the preparation process, the coil material may be prepared which further includes a third material and a fourth material. In the winding process, the winding coil  400  may be provided which further includes a third winding coil  430  provided by winding the third material and a fourth winding coil  440  provided by winding the fourth material. 
     Particularly, according to the present disclosure, in the winding process, the first winding coil  410  and the second winding coil  420  may be spaced apart from each other with the protrusion part  130  therebetween. When the winding coil includes the first to fourth winding coils  410 ,  420 ,  430 , and  440 , the first to fourth winding coils  410 ,  420 ,  430 , and  440  may be spaced apart from each other with protrusion parts  130  therebetween in the winding process. 
     Also, as an example, in the transfer process, in the winding coil  400  accommodated in the recessed portions  211 ,  221 ,  231 , and  241  of the insertion jig  200 , the number of wires in a portion positioned in the inner region in a radial direction R2 of a virtual circle A may be greater than the number of wires in a portion positioned in the outer region in the radial direction R2. This may be because the recessed portions  211 ,  221 ,  231 , and  241  may be configured such that, due to protrusion sections  206 , an inner width WI of the inner region in the radial direction R2 of the virtual circle A is greater than an inner width WO of the outer region in the radial direction R2 of the virtual circle A. 
     Also, the content described above with respect to the device for manufacturing a stator according to the present disclosure may also be applied, in the same manner, to the method of manufacturing a stator according to the present disclosure, and vice versa. 
     According to the present disclosure, the insulation performance of the coil may be enhanced by minimizing stress that occurs in the coil when the coil is inserted into the stator core. Also, by deleting the insertion member used in the related art, the sizes of slots formed in the stator core may be minimized while enhancing the insulation performance of the coil. 
     The present disclosure provides for enhancing insulation performance of a coil by minimizing stress that occurs in the coil when the coil is inserted into a stator core, and further provide for minimizing sizes of slots formed in the stator core, while enhancing the insulation performance of the coil, by deleting an insertion member used in the related art. 
     While this disclosure includes specific examples, it will be apparent after an understanding of the disclosure of this application that various changes in form and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only, and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results may be achieved if the described techniques are performed in a different order, and/or if components in a described system, architecture, device, or circuit are combined in a different manner, and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.