JP2016163359A - Forming method of coil segment and forming device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming method for obtaining a coil segment constructing a stator coil and a forming device.SOLUTION: A first liner part 12 of a preformed body and a part of a turn part 16 (first portion) are sandwiched with a first bending top 60 and a second bending top 62. At the same time, a second liner part 14 of the preformed body 32 and a part of the turn part 16 (second portion) are sandwiched with a third bending top 64 and a forth bending top 66. Sequentially, the first bending top 60 to fourth bending top 66 are simultaneously rotated, a first bend part 18 is formed to the first portion, and a second bend part 20 is formed to the second portion. Thus, a coil segment 10 in which a crank part 22 including the first bend part 18 and the second bend part 20 is formed to the turn part 16 can be obtained.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a method for forming a coil segment to be inserted into two of a plurality of slots formed along the circumferential direction of a stator core, and a molding apparatus therefor.

  2. Description of the Related Art A stator coil is known in which coil segments (hereinafter also simply referred to as “segments”) are inserted into two of a plurality of slots provided in a stator core. In this stator coil, the segment becomes an electrical path. For this reason, conduction is possible between the two slots in which the segments are inserted.

  For example, as shown in FIG. 2 of Patent Document 1 and FIG. 4 of Patent Document 2, the segment has a substantially U-shaped shape. That is, the segment of this type includes a first straight portion, a second straight portion that extends in parallel to the first straight portion, and is opposed to the first straight portion, and is curved and continues from the first straight portion to the second straight portion. And a turn part. In the turn portion, a twist portion (crank portion) for generating a deviation in the radial direction of the stator core is formed.

  Patent Document 2 discloses a technique for obtaining a segment by forming a crank portion using two of a first rotating jig and a second rotating jig. In this case, the first straight portion is inserted into the through hole of the first rotating jig, and the second straight portion is inserted into the through hole of the second rotating jig. Thereafter, the first rotating jig and the second rotating jig are simultaneously rotated in the same direction. A crank part is formed by twisting a turn part with this rotation.

Japanese Patent No. 3118837 Japanese Patent No. 4445389

  In the technique described in Patent Document 2, the first straight portion and the second straight portion are constrained when the two rotating jigs are rotated. In other words, the preform formed as a segment is twisted in a state where the first straight portion and the second straight portion are constrained. For this reason, since a comparatively large tensile / compressive force acts on the turn part, the film covering the preform may possibly be damaged. When such a situation occurs, it is difficult to use as a segment. That is, the segment yield decreases.

  The present invention has been made in order to solve the above-described problems, and it is possible to avoid damaging the film when forming the crank portion. For this reason, the coil segment can improve the segment yield. It aims at providing the shaping | molding method and its shaping | molding apparatus.

To achieve the above object, the present invention provides a method for forming a coil segment to be inserted into a plurality of slots formed along the circumferential direction of a stator core,
The conductor is bent into a substantially U shape having first and second straight portions extending in parallel and facing each other, and a turn portion connected to the first straight portion and the second straight portion. A bending step of obtaining a preform,
A crank part forming step for obtaining a coil segment by forming a crank part in the turn part of the preform;
Have
In the crank portion forming step, the first bending member and the second bending member sandwich the first straight portion and the first portion of the turn portion, and the third bending member and the fourth bending member hold the second straight portion. And sandwiching the second part of the turn part,
Thereafter, by simultaneously rotating the first bending member to the fourth bending member, the first bending member and the second bending member move the first straight portion and the second straight portion, and the first bending member and the second bending member move the first bending portion to the fourth bending member. The first bent portion is formed by pressing one portion, and the crank portion is formed by pressing the second portion with the third and fourth bending members to form the second bent portion. It is characterized by doing.

Further, the present invention is a coil segment forming apparatus for obtaining a coil segment to be inserted into a plurality of slots formed along the circumferential direction of the stator core,
The conductor is bent into a substantially U shape having first and second straight portions extending in parallel and facing each other, and a turn portion connected to the first straight portion and the second straight portion. A first bending member, a second bending member, a third bending member and a fourth bending member for forming a crank portion in the turn portion of the preform formed by
A rotation operation member for rotating the first bending member to the fourth bending member;
Have
The first bending member and the second bending member sandwich the first portion of the first straight portion and the turn portion, and the third bending member and the fourth bending member hold the second straight portion and the turn. The first bending member to the fourth bending member rotate at the same time as the rotation operation member rotates, so that the first straight portion and the second straight portion are moved. The first bending member and the second bending member are pressed against the first portion to form a first bent portion, and the third bending member and the fourth bending member are pressed against the second portion. The crank portion is formed by forming the second bent portion.

  In the present invention, as described above, the first straight portion and the second straight portion of the preform formed between the first bending member to the fourth bending member are used to rotate the first bending member to the fourth bending member. Follow and move. That is, when the first bent portion and the second bent portion (crank portion) are formed, the first straight portion and the second straight portion are not constrained. For this reason, it is possible to avoid a large tensile / compressive force from acting on the turn part, in particular, the first part and the second part that become the first bent part and the second bent part.

  Therefore, the concern that the film covering the preform is damaged is eliminated. As a result, segments can be obtained with a high yield. In other words, the segment yield is improved.

  In order to simultaneously rotate the first bending member to the fourth bending member, the first bending member and the second bending member are connected to each other by the first link member, and the third bending member and the fourth bending member are connected to the second link member. Can be connected to each other. In this configuration, if the first bending member and the third bending member are rotated at the same time, the second bending member and the fourth bending member are simultaneously rotated following this. Of course, the second bending member and the fourth bending member may be rotated at the same time, and thereby the first bending member and the third bending member may be simultaneously rotated.

  In this case, it is preferable to provide a partition member interposed between the first link member and the second link member and the first to fourth bending members. If the first bending member and the second bending member are connected by the first link member under the partition member and the first bending member and the second bending member are slid on the partition member, the first bending member and the second bending member are connected to each other. This is because the first bending member and the second bending member can be easily rotated. Of course, the same applies to the third bending member and the fourth bending member. In this case, the first arc groove and the second arc groove may be formed in the partition member.

  In addition, the partition member is provided with a first engagement portion, and each of the first bending member and the third bending member or each of the second bending member and the fourth bending member is engaged with the first engagement portion. It is preferable to provide the 2nd engaging part to match. In this case, the first bending member and the third bending member, or the second bending member and the fourth bending member rotate with the second engaging portion engaged with the first engaging portion as the rotation center. That is, it becomes easy to define the rotation centers of the first bending member and the third bending member, or the second bending member and the fourth bending member.

  A suitable shape of the first bending member to the fourth bending member is a substantially fan shape. This is because the rotating operation is easy in this case. Then, by setting the rotation center of each of the first bending member to the fourth bending member to a position deviated from the center of the circle, the first bending portion and the first bending member are rotated by the rotated first bending member to the fourth bending member. It becomes easy to form two bent portions.

  Moreover, it is preferable to interpose a 1st spacer between a 1st bending member and a 2nd bending member, and to interpose a 2nd spacer between a 3rd bending member and a 4th bending member. Thereby, the separation interval between the first bending member and the second bending member and the separation interval between the third bending member and the fourth bending member can be maintained substantially constant. The thickness of the first spacer and the second spacer may be set slightly larger than that of the preform.

  The first bending member to the fourth bending member rotate following the rotation of the rotation operation member as described above. Here, for example, a rotation means may be provided, and the rotation operation member may be rotated under the action of the rotation means. Alternatively, the first bending member to the fourth bending member can be rotated manually. In this case, the operator may hold the rotation operation member.

  In the latter case, no electric power is required when forming the crank portion. Therefore, it can be used as a work station even in a place where no power source is provided.

  According to the present invention, when the crank portion is formed in the turn portion of the preform having the first straight portion and the second straight portion, the first straight portion and the second straight portion have the first straight portion. The first bending member and the second bending member that are sandwiched, and the third bending member and the fourth bending member that sandwich the second straight portion move to follow the rotation. That is, it is avoided that the first straight portion and the second straight portion are restrained when the crank portion is formed.

  For this reason, it is avoided that a large tensile / compressive force acts on the turn portion. Therefore, since the concern that the coating covering the preform is damaged is eliminated, the segment yield is improved.

It is a general | schematic whole perspective view of the segment for coils. It is a principal part schematic plan view of the shaping | molding apparatus which concerns on 1st Embodiment of this invention. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. It is a schematic perspective view from the lower part of the main component of the said shaping | molding apparatus. It is a principal part cross-sectional perspective view of the said shaping | molding apparatus. It is a principal part schematic plan view which shows the state which rotated the handle | steering-wheel from FIG. 3, and rotated the bending piece (bending member). In the shaping | molding apparatus which concerns on 2nd Embodiment of this invention, it is the principal part schematic plan view which showed the state before starting formation of a crank part. FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7 when the formation (twisting) of the crank portion is finished.

  Hereinafter, preferred embodiments of the method for forming a coil segment according to the present invention in relation to a forming apparatus for carrying out the method will be described in detail with reference to the accompanying drawings.

  First, a segment (coil segment) will be described with reference to FIG. The segment 10 includes a first straight part 12 and a second straight part 14 extending in parallel to the first straight part 12. Although the first straight portion 12 and the second straight portion 14 face each other, the first straight portion 12 is set slightly shorter than the second straight portion 14.

  The first straight part 12 and the second straight part 14 are connected via a turn part 16. That is, the turn part 16 is curved so as to go from the first straight part 12 to the second straight part 14. For this reason, the segment 10 is substantially U-shaped.

  A first bent portion 18 and a second bent portion 20 are formed in the turn portion 16. The first bent portion 18 and the second bent portion 20 form a meandering crank portion 22 in the turn portion 16. Due to the crank portion 22, the segment 10 is displaced in the direction along the radial direction of the stator core.

  In the segment 10 having the above-described shape, the first straight portion 12 is inserted into one of a plurality of slots provided in a stator core (not shown), and the second straight portion 14 is inserted into another one. This provides an electrical path between these two slots. That is, it is possible to conduct between the slot in which the first straight portion 12 is inserted and the slot in which the second straight portion 14 is inserted.

  Next, a molding apparatus for obtaining the segment 10 will be described in detail. FIG. 2 is a schematic plan view of a main part of the molding apparatus 30 according to the first embodiment, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2 and 3 also show a preformed body 32 in which the crank portion 22 (see FIG. 1) is not formed. In FIG. 3 and FIG. 5 described later, a handle and a groove for passing the handle are not shown.

  The molding apparatus 30 includes a base 34 and a hollow holder 36 that is positioned and fixed on the base 34. The hollow holder 36 having a substantially cylindrical shape is connected to the base 34 by a mounting screw (not shown).

  In the hollow holder 36, a substantially disc-shaped guide plate 40 (partition member) is disposed at a position away from the base 34. The guide plate 40 divides the inside of the hollow holder 36 into a lower chamber 42 and an upper chamber 44 as shown in FIG. Here, four through holes (not shown) extending along the diametrical direction are formed on the side peripheral wall portion of the hollow holder 36 so as to be separated from each other by approximately 90 °. Has a screw hole at a position corresponding to the position of the through hole. The guide plate 40 is positioned and fixed by screwing the fixing screw passed through each through hole into the screw hole.

  As shown in FIG. 4, which is a schematic perspective view from below of the components in the hollow holder 36, a first arc groove 52 and a second arc groove 54 are formed through the guide plate 40 along the thickness direction. Yes. Both the first arc groove 52 and the second arc groove 54 are curved in an arc shape so that the central angle is less than 180 ° (for example, about 150 °).

  In the guide plate 40, a first recess 56 (first engagement portion) having a substantially circular cross section is formed in a recessed portion at a portion corresponding to the center of the first arc groove 52. Similarly, a second concave portion 58 (first engagement portion) having a substantially circular cross section is also formed in a recess corresponding to the center of the second arc groove 54. The first concave portion 56 and the second concave portion 58 are formed so as to be separated from each other by the same distance from the center of the guide plate 40 and to have a phase separated from each other by 180 °.

  For this reason, the 1st recessed part 56 and the 2nd recessed part 58 exist in the position deviated from the center of the guide plate 40 (refer FIG. 2). That is, it does not coincide with the center of the first arc groove 52, and the center of the second arc groove 54 and the center of the guide plate 40 do not coincide. Further, the center of the first arc groove 52 and the center of the second arc groove 54 do not coincide.

  2, 3, and 5, the upper chamber 44 includes a first bending piece 60 (first bending member) and a second bending piece 62 (second bending member) for forming the crank portion 22. ), The third bending piece 64 (third bending member) and the fourth bending piece 66 (fourth bending member) are accommodated. Each of the first bending piece 60 to the fourth bending piece 66 has a substantially sector shape, and the center of each of the first bending piece 60 to the fourth bending piece 66 faces the center of the guide plate 40. The first bending piece 60 and the third bending piece 64 have the same size and shape, and similarly, the second bending piece 62 and the fourth bending piece 66 have the same size and shape.

  The central angle of the first bending piece 60 and the third bending piece 64 is approximately 90 °, while the central angle of the second bending piece 62 and the fourth bending piece 66 is lower than 90 ° (for example, about 80 °). ). For this reason, between the 1st bending piece 60 and the 2nd bending piece 62, between the 2nd bending piece 62 and the 3rd bending piece 64, between the 3rd bending piece 64 and the 4th bending piece 66, the 4th bending piece 66 It is possible to form a clearance between the first bending piece 60 and the first bending piece 60. The diameters of the first bending piece 60 and the third bending piece 64 are set to be slightly larger than the diameters of the second bending piece 62 and the fourth bending piece 66.

  A first convex portion 68 and a second convex portion 70 (both are second engaging portions) are directed to the guide plate 40 at lower end surfaces near the center of the first bending piece 60 and the third bending piece 64, respectively. Protrusions are formed. The first convex portion 68 is inserted into the first concave portion 56, and the second convex portion 70 is inserted into the second concave portion 58. By this insertion, the first convex portion 68 and the second convex portion 70 are engaged with the first concave portion 56 and the second concave portion 58, respectively. Furthermore, screw holes 72 a to 72 d are formed in the respective lower end surfaces of the first bending piece 60 to the fourth bending piece 66.

  The center of the 2nd bending piece 62 and the 4th bending piece 66 is arrange | positioned on the virtual circle containing the 1st recessed part 56 and the 2nd recessed part 58 (refer FIG. 2).

  Adjacent first bending pieces 60 and second bending pieces 62 are connected to a first link member 74 disposed in the lower chamber 42. That is, as shown in FIGS. 4 and 5, the first link member 74 is formed with two insertion holes 76a and 76b, and the connecting screws 78a and 78b passed through the insertion holes 76a and 76b. The (first connecting member) is screwed into the screw hole 72 a of the first bending piece 60 and the screw hole 72 b of the second bending piece 62. At this time, the connecting screws 78 a and 78 b are inserted into the cylindrical collars 79 a and 79 b passed through the first arc groove 52.

  Similarly, the third bending piece 64 and the fourth bending piece 66 are connected to the second link member 80 having the same shape and the same size as the first link member 74 via connection screws 78c and 78d (second connection member). Connected. That is, the connecting screws 78c and 78d passed through the insertion holes 84a and 84b of the second link member 80 are screwed into the screw holes 72c of the third bending piece 64 and the screw holes 72d of the fourth bending piece 66, respectively. . At this time, the connecting screws 78c and 78d are inserted into the cylindrical collars 79c and 79d passed through the second arc groove 54.

  The heights of the cylindrical collars 79 a to 79 d are slightly larger than the thickness of the guide plate 40. For this reason, a slight clearance is formed between the lower end surfaces of the first bending piece 60 to the fourth bending piece 66 and the upper end surface of the guide plate 40. Further, the outer diameters of the cylindrical collars 79 a to 79 d are set to be smaller than the groove widths of the first arc groove 52 and the second arc groove 54.

  The clearance allows the first bending piece 60 to the fourth bending piece 66 to move smoothly on the guide plate 40. If the cylindrical collars 79a to 79d are not used, the connecting screws 78a to 78d may be tightened excessively with respect to the first bending piece 60 to the fourth bending piece 66. In this case, since the first bending piece 60 to the fourth bending piece 66 are pressed against the guide plate 40, the first bending piece 60 to the fourth bending piece 66 cannot be rotated. That is, the cylindrical collars 79a to 79d prevent excessive tightening of the connection screws 78a to 78d and smoothly move the first bending piece 60 to the fourth bending piece 66 on the guide plate 40.

  On the other hand, a first spacer 86 is interposed between the first bending piece 60 and the second bending piece 62. By this first spacer 86, the spacing distance between the first bending piece 60 and the second bending piece 62 is kept constant. Similarly, the spacing between the third bending piece 64 and the fourth bending piece 66 is kept constant by the second spacer 88 interposed between the third bending piece 64 and the fourth bending piece 66. The thickness of the first spacer 86 and the second spacer 88 is slightly larger than that of the preformed body 32, and the shape of the portions facing each other corresponds to the shape of the turn portion 16 of the preformed body 32.

  Furthermore, in the first embodiment, as shown in FIG. 2, handle attachment screw holes 90 a and 90 b are formed in each arc portion (outer peripheral wall) of the first bending piece 60 and the third bending piece 64. On the other hand, a first passage groove 92 and a second passage groove 94 are formed through the side peripheral wall of the hollow holder 36 in a circular arc shape over a predetermined angle along the side peripheral wall portion. A first end portion of the first handle 96 (rotation operation member) is inserted into the first passage groove 92, and a screw portion provided at the front end portion is screwed into a handle mounting screw hole 90 a of the first bending piece 60. Combined. Similarly, the screw portion provided at the tip of the second handle 98 (rotation operation member) inserted into the second passage groove 94 is screwed into the handle mounting screw hole 90b of the third bending piece 64.

  As will be described later, the first handle 96 and the second handle 98 are rotation operation members for the operator to rotate the first bending piece 60 to the fourth bending piece 66, and a holding member for holding at that time. But there is.

  The molding apparatus 30 according to the first embodiment is basically configured as described above. Next, the function and effect will be described in relation to the method of molding the segment 10.

  This forming method includes a bending step for obtaining the preformed body 32 and a crank portion forming step for obtaining the segment 10 by forming the crank portion 22 in the preformed body 32. This will be specifically described below.

  First, in a bending process, a linear conductor having a substantially rectangular parallelepiped shape is bent using a bending device (not shown). By this bending, a substantially U having a first straight portion 12 and a second straight portion 14 that extend substantially parallel to each other and that face each other, and a turn portion 16 that continues to the first straight portion 12 and the second straight portion 14. A letter-shaped preform 32 is obtained. At this time, the crank portion 22 (the first bent portion 18 and the second bent portion 20) is not formed in the turn portion 16.

  Next, in order to perform the crank portion forming step, the first straight portion 12 and a part of the turn portion 16 (first portion) of the preform 32 are inserted between the first bending piece 60 and the second bending piece 62. At the same time, another part (second portion) of the second straight portion 14 and the turn portion 16 is inserted between the third bending piece 64 and the fourth bending piece 66. At this time, the turn portion 16 faces the guide plate 40 side, the first spacer 86 and the second spacer 88 are positioned so that the turn portion 16 is not inclined, and the top portion of the turn portion 16 is brought into contact with the guide plate 40. Let The operator can recognize that the insertion of the preformed body 32 has been completed by blocking the preformed body 32 along with this contact.

  After the insertion is completed, the operator holds the first handle 96 and the second handle 98. Thereafter, the first handle 96 and the second handle 98 are rotated counterclockwise, for example. At this time, the first handle 96 and the second handle 98 move in the first passage groove 92 and the second passage groove 94 formed in the hollow holder 36, respectively.

  As described above, the first handle 96 is connected to the first bending piece 60, and the second handle 98 is connected to the third bending piece 64. Further, a second bending piece 62 is connected to the first bending piece 60 via a first link member 74, and a fourth bending piece 66 is connected to the third bending piece 64 via a second link member 80. Are connected. Therefore, when the first handle 96 and the second handle 98 are rotated, the first bending piece 60 and the third bending piece 64 rotate around the first convex portion 68 and the second convex portion 70 as rotation centers, Following this, the second bending piece 62 and the fourth bending piece 66 also rotate. That is, in the forming apparatus 30 according to the first embodiment, the first bending piece 60 to the fourth bending piece 66 are simultaneously rotated by the manual operation (manpower) of the operator.

  The rotation center of the second bending piece 62 is the first convex portion 68 as in the first bending piece 60, while the rotation center of the fourth bending piece 66 is the second convex portion as in the third bending piece 64. 70. The second bending piece 62 is connected to the first bending piece 60 via a linear first link member 74, and similarly, the fourth bending piece 66 is connected to the third bending piece 60 via a linear second link member 80. This is because it is connected to 64.

  The first bending piece 60 to the fourth bending piece 66 are finally rotated to the position shown in FIG. The angle from the start of rotation to the end of rotation may be set according to the degree of bending of the crank portion 22, and may be an arbitrary angle within a range of 50 ° to 60 °, for example.

  Since the 1st bending piece 60-the 4th bending piece 66 rotate simultaneously, the preforming body 32 also rotates. Here, since the rotation centers of the first bending piece 60 to the fourth bending piece 66 are offset from the center of the guide plate 40, the centers of the second bending piece 62 and the fourth bending piece 66 are from the turn part 16 side. The first linear portion 12 side and the second linear portion 14 side are relatively retracted. For this reason, the exposure amount from the 1st bending piece 60 of the turn part 16 to the 4th bending piece 66 becomes large compared with before rotation.

  Further, the first portion of the turn portion 16 that is close to the first straight portion 12 is pressed from the center of the first bending piece 60 and the center of the second bending piece 62. By this pressing, the first bent portion 18 is formed at the first portion. At the same time, the second portion of the turn portion 16 that is close to the second straight portion 14 is pressed from the center of the third bending piece 64 and the center of the fourth bending piece 66, so that the second portion is bent to the second portion. Part 20 is formed. As both the first bent portion 18 and the second bent portion 20 are formed in this manner, the crank portion 22 including the first bent portion 18 and the second bent portion 20 is formed. As a result, the segment 10 in which the crank portion 22 is formed in the turn portion 16 is obtained.

  As described above, in this embodiment, the first bending piece 60 to the fourth bending piece 66 rotate without the first straight portion 12 and the second straight portion 14 being constrained when the crank portion 22 is formed. Rotates (moves) following this. Accordingly, the tensile / compressive force acting on the turn portion 16 (particularly the first part and the second part) is small. For this reason, when forming the crank part 22, it is avoided that the film | membrane which covers the preforming body 32 is damaged. That is, it becomes easy to obtain the segment 10 covered with the film. After all, according to the present embodiment, the yield of the segment 10 is improved.

  Further, since the crank portion 22 is formed by human power, no electric power is required. Therefore, it can be a work station even in a place where no power source is provided.

  In order to obtain a segment that is mirror-symmetrical with the segment 10, instead of the guide plate 40, a guide plate in which the first arc groove, the second arc groove, the first recess, and the second recess are formed in a mirror-symmetrical position with respect to FIG. In use, the first handle 96 and the second handle 98 may be rotated clockwise. In the hollow holder, the first passage groove and the second passage groove are at an appropriate angle at which the first handle 96 and the second handle 98 can be rotated clockwise.

  You may make it rotate a rotation operation member under the effect | action of a rotation means. This configuration will be described as a second embodiment. The same components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 7 is a schematic plan view of a main part of the molding apparatus 100 according to the second embodiment, and FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7 shows a state before the formation of the crank portion 22 is started, while FIG. 8 shows a state when the formation (twisting) of the crank portion 22 is finished.

  The molding apparatus 100 includes a motor 102 as a rotating means. The motor 102 is energized or deenergized by energization or de-energization from a power source (not shown). The motor 102 is accommodated in the motor case 104.

  A substantially disc-shaped bracket 108 is positioned and fixed to the rotating shaft 103 of the motor 102 via a mounting screw 106. A substantially ring-shaped rotating plate 110 is fitted on the small diameter portion of the bracket 108. The lower end portion of the bracket 108 is a large diameter portion, and the rotating plate 110 is supported from below by the large diameter portion. Further, two screw holes 112a and 112b are formed through the rotating plate 110 along the thickness direction.

  The upper part of the motor case 104 is closed with a ceiling plate 114. The ceiling plate 114 is formed with a first large arc-shaped groove 116 and a second large arc-shaped groove 117 having a central angle smaller than 180 °. The first large arc-shaped groove 116 and the second large arc-shaped groove 117 are located on the circumference of the same virtual circle.

  A first vertical shaft 118 and a second vertical shaft 120 extending in the vertical direction are passed through the first large arc-shaped groove 116 and the second large arc-shaped groove 117, respectively. The small diameter lower ends of the first vertical shaft 118 and the second vertical shaft 120 are screwed into the screw holes 112a and 112b. In this configuration, before the rotation shaft 103 starts to rotate, the first vertical shaft 118 is positioned at an intermediate point of the first large arc-shaped groove 116, and the second vertical shaft 120 is positioned at an intermediate point of the second large arc-shaped groove 117. To position.

  Joints 122a and 122b are provided at the upper ends of the first vertical shaft 118 and the second vertical shaft 120, respectively. A first vertical shaft 118 and a second vertical shaft 120 are slidably inserted into vertical holes (not shown) formed in the joints 122a and 122b, respectively. That is, the first vertical shaft 118 and the second vertical shaft 120 can rotate in the vertical hole.

  A first horizontal shaft 124 and a second horizontal shaft 126 are connected to the first vertical shaft 118 and the second vertical shaft 120 via joints 122a and 122b. Specifically, a lateral hole (not shown) is further formed in each of the joints 122a and 122b. The first horizontal shaft 124 and the second horizontal shaft 126 are slidably inserted into the horizontal holes. That is, the joints 122 a and 122 b can be displaced in a direction approaching or separating from the hollow holder 36 while being guided by the first lateral shaft 124 and the second lateral shaft 126.

  As will be described later, in the second embodiment, the first vertical shaft 118, the second vertical shaft 120, the first horizontal shaft 124, and the second horizontal shaft 126 rotate the first bending piece 60 to the fourth bending piece 66. It functions as a rotation operation member.

  The distal end portions of the first horizontal shaft 124 and the second horizontal shaft 126 extending along the horizontal direction pass through the first passage groove 92 and the second passage groove 94 that are formed through the hollow holder 36 in an arc shape. The first bending piece 60 is screwed into the handle attachment screw hole 90a and the third attachment piece 64 is attached to the handle attachment screw hole 90b.

  Except for the above points, the molding apparatus 100 is configured in accordance with the molding apparatus 30 described above.

  When the segment 10 is molded using the molding apparatus 100, first, a substantially U-shaped preform 32 is obtained in the same manner as described above. Next, the first straight portion 12 and a part (first portion) of the turn portion 16 of the preform 32 are inserted between the first bending piece 60 and the second bending piece 62, and the second straight portion 14 Another part (second portion) of the turn portion 16 is inserted between the third bending piece 64 and the fourth bending piece 66.

  At this time, similarly to the first embodiment, the turn portion 16 faces the guide plate 40 side, the first spacer 86 and the second spacer 88 are positioned so as not to tilt, and the turn portion 16 The top is brought into contact with the guide plate 40. The operator can recognize that the insertion of the preformed body 32 has been completed by blocking the preformed body 32 along with this contact.

  After the insertion is completed, the operator energizes the motor 102 by energizing the motor 102. Accordingly, for example, when the rotation shaft 103 of the motor 102 rotates clockwise, the rotating plate 110 rotates following the rotation clockwise. Therefore, the first vertical shaft 118 and the second vertical shaft 120 whose front ends are screwed into the screw holes 112 a and 112 b of the rotating plate 110 are along the first large arc-shaped groove 116 and the second large arc-shaped groove 117. Displace (turn) clockwise.

  As described above, the first horizontal shaft 124 and the second horizontal shaft 126 are connected to the first vertical shaft 118 and the second vertical shaft 120 via the joints 122a and 122b, respectively. Accordingly, the first horizontal shaft 124 and the second horizontal shaft 126 are displaced (rotated) clockwise following the first vertical shaft 118 and the second vertical shaft 120.

  Also in the molding apparatus 100, the first horizontal shaft 124 is connected to the first bending piece 60, and the second horizontal shaft 126 is connected to the third bending piece 64. Further, a second bending piece 62 is connected to the first bending piece 60 via a first link member 74, and a fourth bending piece 66 is connected to the third bending piece 64 via a second link member 80. Are connected. Therefore, when the first horizontal shaft 124 and the second horizontal shaft 126 rotate, the first bending piece 60 and the third bending piece 64 rotate around the first convex portion 68 and the second convex portion 70 as rotation centers, Following this, the second bending piece 62 and the fourth bending piece 66 also rotate. As described above, in the molding apparatus 100 according to the second embodiment, the first bending piece 60 to the fourth bending piece 66 rotate simultaneously under the action of the motor 102.

  When the first bending piece 60 and the third bending piece 64 are simultaneously rotated using one motor 102 as described above, the rotation center of the rotating plate 110 and the rotation centers of the first bending piece 60 and the third bending piece 64 are obtained. Therefore, the rotation angle of the rotation shaft 103 and the rotation angles of the first bending piece 60 and the third bending piece 64 are not the same. Due to this, the joints 122a and 122b are pulled to the hollow holder 36 side (diameter direction inner side).

  Here, in the second embodiment, as described above, the first vertical shaft 118 and the second vertical shaft 120 inserted into the vertical holes of the joints 122a and 122b are rotatable. The joints 122a and 122b are slidable relative to the first horizontal shaft 124 and the second horizontal shaft 126 inserted through the horizontal holes. For this reason, the joints 122a and 122b are relatively displaced toward the hollow holder 36 while being guided by the first horizontal shaft 124 and the second horizontal shaft 126. As described above, even when the rotation angle of the rotation shaft 103 is different from the rotation angles of the first bending piece 60 and the third bending piece 64, the joints 122a and 122b can be displaced. The bending pieces 60 to the fourth bending piece 66 can be rotated simultaneously.

  Thereafter, as in the first embodiment, as both the first bent portion 18 and the second bent portion 20 are formed, the crank portion 22 including the first bent portion 18 and the second bent portion 20 is formed. Is formed. That is, the segment 10 in which the crank portion 22 is formed in the turn portion 16 is obtained.

  When the first vertical shaft 118 reaches the end point of the first large circular arc groove 116 and the second vertical shaft 120 reaches the end point of the second large circular arc groove 117, the first vertical shaft 118 and the second vertical shaft 120 are reached. Cannot progress any further. Therefore, it is avoided that the crank part 22 is excessively twisted.

  The operator may confirm that this state has been reached and stop energization of the motor 102. As a result, the rotation of the rotating shaft 103 is stopped, so that the segment 10 is released from the twisting force.

  The present invention is not particularly limited to the first embodiment and the second embodiment described above, and various modifications can be made without departing from the gist of the present invention.

  For example, the first handle 96 (or the first lateral shaft 124) is connected to the second bending piece 62, and the second handle 98 (or the second lateral shaft 126) is connected to the fourth bending piece 66. Good.

  Of course, a concave portion may be formed in the first bending piece 60 and the third bending piece 64 while the convex portion is formed on the guide plate 40, and the convex portion may be engaged with the concave portion. .

DESCRIPTION OF SYMBOLS 10 ... Segment for coils 12 ... 1st linear part 14 ... 2nd linear part 16 ... Turn part 18 ... 1st bending part 20 ... 2nd bending part 22 ... Crank part 30, 100 ... Molding apparatus 32 ... Preliminary molded object 36 ... Hollow holder 40 ... guide plate 52 ... first arc groove 54 ... second arc groove 56 ... first recess 58 ... second recess 60 ... first bending top 62 ... second bending top 64 ... third bending top 66 ... fourth Bending piece 68 ... first convex part 70 ... second convex part 74 ... first link members 78a to 78d ... connecting screw 80 ... second link member 86 ... first spacer 88 ... second spacer 96 ... first handle 98 ... first 2 Handle 102 ... Motor 103 ... Rotating shaft 110 ... Rotating plate 112a, 112b ... Screw hole 114 ... Ceiling plate 116 ... First large arc-shaped groove 117 ... Second large arc-shaped groove 118 ... First vertical shaft 120 ... Second Vertical sha DOO 124 ... first horizontal shaft 126 ... second horizontal shaft

Claims (9)

A method for forming a coil segment to be inserted into a plurality of slots formed along a circumferential direction of a stator core,
The conductor is bent into a substantially U shape having first and second straight portions extending in parallel and facing each other, and a turn portion connected to the first straight portion and the second straight portion. A bending step of obtaining a preform,
A crank part forming step for obtaining a coil segment by forming a crank part in the turn part of the preform;
Have
In the crank portion forming step, the first bending member and the second bending member sandwich the first straight portion and the first portion of the turn portion, and the third bending member and the fourth bending member hold the second straight portion. And sandwiching the second part of the turn part,
Thereafter, by simultaneously rotating the first bending member to the fourth bending member, the first bending member and the second bending member move the first straight portion and the second straight portion, and the first bending member and the second bending member move the first bending portion to the fourth bending member. The first bent portion is formed by pressing one portion, and the crank portion is formed by pressing the second portion with the third and fourth bending members to form the second bent portion. A method for forming a coil segment, comprising:   2. The molding method according to claim 1, wherein the first bending member and the second bending member are connected to each other by a first link member, and the third bending member and the fourth bending member are connected to each other by a second link member. The first bending member and the third bending member, or the second bending member and the fourth bending member are simultaneously rotated, so that the first bending member to the fourth bending member are simultaneously rotated. A method for forming a coil segment, which is characterized in that A coil segment forming apparatus for obtaining a coil segment to be inserted into a plurality of slots formed along a circumferential direction of a stator core,
The conductor is bent into a substantially U shape having first and second straight portions extending in parallel and facing each other, and a turn portion connected to the first straight portion and the second straight portion. A first bending member, a second bending member, a third bending member and a fourth bending member for forming a crank portion in the turn portion of the preform formed by
A rotation operation member for rotating the first bending member to the fourth bending member;
Have
The first bending member and the second bending member sandwich the first portion of the first straight portion and the turn portion, and the third bending member and the fourth bending member hold the second straight portion and the turn. The first bending member to the fourth bending member rotate at the same time as the rotation operation member rotates, so that the first straight portion and the second straight portion are moved. The first bending member and the second bending member are pressed against the first portion to form a first bent portion, and the third bending member and the fourth bending member are pressed against the second portion. And forming the second bent portion to form the crank portion.   4. The molding apparatus according to claim 3, further comprising: a first link member that connects the first bending member and the second bending member; and a second link member that connects the third bending member and the fourth bending member. An apparatus for forming a coil segment. 5. The molding apparatus according to claim 4, wherein the first arc member and the second arc member are interposed between the first link member and the second link member and the first to fourth bending members, and the first arc groove and the second arc groove are provided. Having a partition member formed,
The first link member, the first bending member, and the second bending member are connected via a first connecting member that is passed through the first arcuate groove, and the second link member and the third bending member are connected. An apparatus for forming a coil segment, wherein the member and the fourth bending member are connected through a second connecting member passed through the second arcuate groove. The molding apparatus according to claim 5, wherein the partition member is provided with a first engaging portion, and each of the first bending member and the third bending member, or the second bending member and the fourth bending member. Each of which is provided with a second engaging portion that engages with the first engaging portion,
The first bending member and the third bending member, or the second bending member and the fourth bending member rotate about the second engaging portion engaged with the first engaging portion as a rotation center. An apparatus for forming a coil segment, characterized by:   7. The molding apparatus according to claim 4, wherein the first bending member to the fourth bending member have a substantially sector shape, and each rotation center is deviated from the center of the circle. An apparatus for forming a coil segment, wherein   8. The molding apparatus according to claim 4, wherein the first spacer interposed between the first bending member and the second bending member, the third bending member, and the fourth bending device. A coil segment forming apparatus comprising a second spacer interposed between the bending member and the bending member.   9. The molding apparatus for a coil segment according to claim 4, further comprising a rotating means for rotating the rotation operation member.

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