Winding machine and method for manufacturing a coil

Abstract

One embodiment of the present application is a winding machine including: a winding core around which a winding is wound; a first winding jig and a second winding jig configured to hold the winding core in an axial direction of a central axis of the winding core; and a first gripping member and a second gripping member located outside the winding core in a radial direction centered on the central axis. An outer edge portion of the first winding jig in the radial direction and an outer edge portion of the second winding jig in the radial direction are located at positions outside the winding core in the radial direction. The first gripping member and the second gripping member each have a pair of rollers capable of gripping the winding to grip the winding. At least one of the first gripping member and the second gripping member is rotatable about the central axis.

Description

TECHNICAL FIELD

[0001] The present application relates to a winding machine and a manufacturing method of a coil. BACKGROUND

[0002] For example, a manufacturing method of a coil in which a wire material guide holding portion is moved in correspondence with timing of winding a winding group while pressing the winding group is described in Japanese Patent Application Publication No. 2012-139098.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-139098 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In the manufacturing method of a coil of Japanese Patent Application Publication No. 2012-139098, the wire material guide holding portion needs to be moved in correspondence with timing of winding a winding group, and therefore the configuration of a winding machine for manufacturing a coil is easily complicated.

[0008] The present application was made in view of the above circumstances, and one of the objects thereof is to provide a winding machine capable of appropriately manufacturing a coil with a simple configuration, and a manufacturing method of a coil using such a winding machine.

[0009] MEANS FOR SOLVING PROBLEMS

[0010] One embodiment of the present application is a winding machine including: a winding core around which a winding group is wound; a first winding jig and a second winding jig configured to hold the winding core in an axial direction of a central axis of the winding core; and a first gripping member and a second gripping member located outside the winding core in a radial direction centered on the central axis. An outer edge portion of the first winding jig in the radial direction and an outer edge portion of the second winding jig in the radial direction are located outside the winding core in the radial direction. The first gripping member and the second gripping member each include a pair of rollers capable of gripping the winding group. At least one of the first gripping member and the second gripping member is rotatable around the central axis.

[0011] A manufacturing method of a coil according to one embodiment of the present application includes a process of winding a winding group using the winding machine described above.

[0012] EFFECTS OF THE INVENTION

[0013] According to one embodiment of the present application, a winding machine can be configured simply, and a coil can be manufactured appropriately. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a cross-sectional view schematically showing a motor of the present embodiment.

[0015] Figure 2 is a cross-sectional view showing a part of a stator of the present embodiment, and is a cross-sectional view along the line II-II in Figure 1 .

[0016] Figure 3 is a perspective view showing a part of a coil of the present embodiment.

[0017] Figure 4 is a flowchart showing steps in a manufacturing method of a coil of the present embodiment.

[0018] Figure 5 is a cross-sectional view showing a part of steps in a manufacturing method of a coil of the present embodiment.

[0019] Figure 6 is a perspective view showing a winding machine of the present embodiment.

[0020] Figure 7 is a cross-sectional view showing a winding machine of the present embodiment, and is a cross-sectional view along the line VII-VII in Figure 6 .

[0021] Figure 8 is a perspective view showing a state halfway through assembly of a winding machine of the present embodiment.

[0022] Figure 9 is a perspective view showing a first guide portion and a second guide portion of the present embodiment.

[0023] Figure 10 is a perspective cross-sectional view showing a part of a first gripping member of the present embodiment.

[0024] Figure 11 is a perspective cross-sectional view showing a part of a first gripping member of the present embodiment, and is a partial enlarged view of Figure 10 .

[0025] Figure 12 is a perspective cross-sectional view showing a part of an assembly step of a winding machine of the present embodiment.

[0026] Figure 13 is a view showing a part of a winding step of a winding using a winding machine of the present embodiment.

[0027] Figure 14 is a view showing another part of a winding step of a winding using a winding machine of the present embodiment.

[0028] Figure 15is a view showing another portion of the winding step of the winding of the winding machine using the present embodiment.

[0029] Figure 16 is a partial cross-sectional view showing a state in which the winding is wound around the winding core of the present embodiment.

[0030] Figure 17 is a perspective view showing a portion of the 2nd winding body of the present embodiment.

[0031] Figure 18 is a cross-sectional view showing another portion of the step in the manufacturing method of the coil of the present embodiment. DETAILED DESCRIPTION

[0032] As Figure 1 shown, the motor 1 of the present embodiment is a motor of an inner rotor type. A central axis of the motor 1 is a motor axis J1. The motor axis J1 is an imaginary axis extending in one direction. In each drawing, the direction in which the motor axis J1 extends is indicated by a Z1 axis. In the following description, the axial direction of the motor axis J1 is referred to as a "motor axial direction", the radial direction centered on the motor axis J1 is referred to as a "motor radial direction", and the circumferential direction centered on the motor axis J1 is referred to as a "motor circumferential direction".

[0033] The motor 1 has a housing 2, a rotor 3, a stator 10, a bearing holder 4, and bearings 5a, 5b. The housing 2 houses the rotor 3, the stator 10, the bearing holder 4, and the bearings 5a, 5b. The rotor 3 is rotatable about the motor axis J1. The rotor 3 has a shaft 3a and a rotor body 3b.

[0034] The shaft 3a extends in the motor axial direction along the motor axis J1. The shaft 3a is, for example, in a cylindrical shape extending in the motor axial direction about the motor axis J1. The shaft 3a is supported by the bearings 5a, 5b so as to be rotatable about the motor axis J1. The rotor body 3b is fixed to an outer peripheral surface of the shaft 3a. Although not shown in the drawing, the rotor body 3b has a rotor core fixed to the outer peripheral surface of the shaft 3a and magnets fixed to the rotor core. The bearing holder 4 holds the bearing 5b.

[0035] The stator 10 opposes the rotor 3 across a gap in the motor radial direction. In the present embodiment, the stator 10 is located on the motor radial direction outer side of the rotor 3. As Figure 2 shown, the stator 10 has a stator core 20, a plurality of coils 30, and an insulating member 40. The stator core 20 has a ring-shaped core back 21 that surrounds the motor axis J1 and a plurality of teeth 22 that extend from the core back 21 to the motor radial direction inner side. The core back 21 is, for example, in a cylindrical shape about the motor axis J1.

[0036] The plurality of teeth 22 are arranged at intervals in the motor circumferential direction. The plurality of teeth 22 are, for example, arranged at equal intervals in the entire range in the motor circumferential direction. In the present embodiment, the plurality of teeth 22 are integrated with the core back 21. Each tooth 22 is a substantially rectangular parallelepiped extending linearly in the motor radial direction. The size of the tooth 22 in the motor circumferential direction is substantially constant in the entire range in the motor radial direction.

[0037] In addition, the tooth 22 can be provided with an umbrella-shaped portion protruding to both sides in the motor circumferential direction at an end portion on the inner side in the motor radial direction. Further, the tooth 22 can be a separate member from the core back 21. In this case, the tooth 22 can be fixed to the core back 21, for example, by pressing a protrusion provided at an end portion on the outer side in the motor radial direction of the tooth 22 into a recess provided on the inner side in the motor radial direction of the core back 21.

[0038] The plurality of coils 30 are respectively mounted to the plurality of teeth 22. In the present embodiment, the coil 30 is mounted to the tooth 22 with an insulating member 40 interposed therebetween. Each tooth 22 passes through the inner side of each coil 30 in the motor radial direction. The inner end portion of the tooth 22 protrudes to the inner side in the motor radial direction than the coil 30.

[0039] The coil 30 is constituted by winding a flat wire. Therefore, compared to the case where a round wire is used, it is possible to increase the packing factor of the coil 30. In the present specification, the "flat wire" refers to a wire having a quadrangular or substantially quadrangular cross-sectional shape. In the present specification, the "substantially quadrangular" includes a rounded quadrangle in which the corners of the quadrangle are rounded. Although not shown in the drawings, in the present embodiment, the flat wire constituting the coil 30 is an enameled wire having an enameled film on the surface.

[0040] The coil 30 has a pair of axial extension portions 30b extending in the motor axial direction on both sides in the motor circumferential direction of the tooth 22 to which the coil 30 is mounted. The pair of axial extension portions 30b sandwich the tooth 22 in the motor circumferential direction. The axial extension portion 30b is constituted by bundling a plurality of portions of the flat wire constituting the coil 30. The profile shape in the cross section perpendicular to the motor axial direction of the axial extension portion 30b is, for example, a sector shape in which the size in the motor circumferential direction decreases toward the inner side in the motor radial direction.

[0041] In the present specification, a "fan shape" includes a shape enclosed by two arcs having the same center of curvature and different radii and two line segments extending in the radial direction of a circle centered on the center of curvature and connecting the two ends of the two arcs to each other, respectively. In addition, in the present specification, a "fan shape" includes a case where the shape is strictly a fan shape and a case where the shape is approximately a fan shape. In the present specification, an "approximately fan shape" includes a shape in which the arcs of the fan shape are approximated by a plurality of line segments. In the present embodiment, the outline shape of the axial extension 30b in a cross section perpendicular to the motor axis is a shape enclosed by the two arcs and the two line segments described above. Although not shown in the drawings, the center of curvature of the outline shape of the axial extension 30b in the cross section perpendicular to the motor axis is located on the motor radial inner side of the core back 21 and at a position different from the motor axis J1.

[0042] The coil 30 has a first winding body 31 and a second winding body 32. The first winding body 31 and the second winding body 32 are each configured by winding a flat wire. In the present embodiment, the first winding body 31 configures a portion on the motor radial inner side in the coil 30. In the present embodiment, the second winding body 32 configures a portion on the motor radial outer side in the coil 30. That is, the second winding body 32 is located on the motor radial outer side of the first winding body 31.

[0043] The second winding body 32 is connected to the first winding body 31. More specifically, as shown in FIG. 2, one end portion 31c of the flat wire configuring the first winding body 31 is connected to one end portion 32c of the flat wire configuring the second winding body 32. Thus, the first winding body 31 and the second winding body 32 are connected in series to configure one coil 30. The method of connecting the one end portion 31c to the one end portion 32c is not particularly limited. The one end portion 31c and the one end portion 32c can be fixed by soldering, can be fixed by laser welding, or can be fixed by ultrasonic bonding. In addition, recesses that engage with each other can be provided in the one end portion 31c and the one end portion 32c, respectively. Figure 3

[0044] In the following description, let N be an arbitrary integer of one or more, and let M be an arbitrary integer larger than N. At this time, the first winding body 31 is a winding body in which N layers are arranged and wound in two columns arranged in the motor radial direction. The second winding body 32 is a winding body in which M layers are arranged and wound in two columns arranged in the motor radial direction. As shown in FIG. 2, in the present embodiment, the first winding body 31 is configured by overlapping three layers of windings arranged and wound in two columns arranged in the motor radial direction. That is, in the present embodiment, N is three, and the first winding body 31 is a winding body in which three layers are arranged and wound in two columns arranged in the motor radial direction. Thus, the total number of turns of the first winding body 31 is six. Figure 2

[0045] ​​In the present embodiment, the second winding body 32 is a winding body in which the array winding is arranged in two rows in the motor radial direction and in which the winding is overlapped by four layers. That is, in the present embodiment, M is 4, and the second winding body 32 is a four-layer winding body in which the array winding is arranged in two rows in the motor radial direction. Thus, the total number of turns of the second winding body 32 is 8. Therefore, the total number of turns of the coil 30 is 14.

[0046] The first winding body 31 has a pair of first axial extension portions 31b that extend in the motor axial direction on both sides of the motor circumferential direction of the tooth 22 on which the first winding body 31 is mounted. The profile shape in the cross section perpendicular to the motor axial direction of the first axial extension portion 31b is, for example, a fan shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radial inner side. More specifically, the profile shape in the cross section perpendicular to the motor axial direction of the first axial extension portion 31b is a shape surrounded by two arcs and two line segments, like the axial extension portion 30b described above.

[0047] In the present embodiment, the cross-sectional shape of the portion of the flat wire that constitutes the first axial extension portion 31b of the first winding body 31 is a trapezoidal shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radial inner side. More specifically, the cross-sectional shape of the portion of the flat wire that constitutes the first axial extension portion 31b of the first winding body 31 is a rounded trapezoidal shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radial inner side. In the following description, the portion of the flat wire that constitutes the first axial extension portion 31b of the first winding body 31 will be referred to as the first coil wire portion 31a.

[0048] The pair of first axial extension portions 31b are each constituted by bundling a plurality of first coil wire portions 31a. In the present embodiment, each first axial extension portion 31b is constituted by bundling six first coil wire portions 31a. More specifically, in the present embodiment, each first axial extension portion 31b is constituted by arranging two rows of columns in the motor radial direction, the columns being arranged in the motor circumferential direction by three first coil wire portions 31a. The size in the motor circumferential direction in the cross section of the first coil wire portion 31a that constitutes the column on the motor radial outer side of the two rows arranged in the motor radial direction is larger than the size in the motor circumferential direction in the cross section of the first coil wire portion 31a that constitutes the column on the motor radial inner side. The size in the motor radial direction in the cross section of the first coil wire portion 31a that constitutes the column on the motor radial outer side is smaller than the size in the motor radial direction in the cross section of the first coil wire portion 31a that constitutes the column on the motor radial inner side. The cross-sectional areas of the first coil wire portions 31a are all the same.

[0049] The second winding body 32 has a pair of second axial extensions 32b extending in the motor axial direction on both sides of the motor circumferential direction of the teeth 22 on which the second winding body 32 is mounted. The pair of second axial extensions 32b are disposed adjacent to the motor radially outer sides of the pair of first axial extensions 31b, respectively. The axial extension 30b of the coil 30 is constituted by the first axial extension 31b of the first winding body 31 and the second axial extension 32b of the second winding body 32 that are adjacent in the motor radial direction. That is, the axial extension 30b has the first axial extension 31b of the first winding body 31 and the second axial extension 32b of the second winding body 32.

[0050] The profile shape in the cross section of the second axial extension 32b perpendicular to the motor axial direction is, for example, a sector shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radially inner side. More specifically, the profile shape in the cross section of the second axial extension 32b perpendicular to the motor axial direction is a shape enclosed by two arcs and two line segments, like the axial extension 30b described above.

[0051] In the present embodiment, the cross-sectional shape of the portion of the flat wire constituting the second axial extension 32b of the second winding body 32 is a trapezoidal shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radially inner side. More specifically, the cross-sectional shape of the portion of the flat wire constituting the second axial extension 32b of the second winding body 32 is a rounded trapezoidal shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radially inner side. In the following description, the portion of the flat wire constituting the second axial extension 32b of the second winding body 32 will be referred to as the second coil wire portion 32a.

[0052] The pair of second axial extensions 32b are each constituted by bundling a plurality of second coil wire portions 32a. In the present embodiment, each second axial extension 32b is constituted by bundling eight second coil wire portions 32a. More specifically, in the present embodiment, each second axial extension 32b is constituted by two columns of four second coil wire portions 32a arranged in the motor circumferential direction. The size in the motor circumferential direction in the cross section of the second coil wire portions 32a constituting the column on the motor radially outer side of the two columns arranged in the motor radial direction is larger than the size in the motor circumferential direction in the cross section of the second coil wire portions 32a constituting the column on the motor radially inner side. The size in the motor circumferential direction in the cross section of the second coil wire portions 32a is smaller than the size in the motor circumferential direction in the cross section of the first coil wire portions 31a.

[0053] The dimension in the motor radial direction in the cross section of the 2nd coil wire portion 32a that constitutes the row on the radially outer side of the motor is smaller than the dimension in the motor radial direction in the cross section of the 2nd coil wire portion 32a that constitutes the row on the radially inner side of the motor. The dimension in the motor radial direction in the cross section of the 2nd coil wire portion 32a is larger than the dimension in the motor radial direction in the cross section of the 1st coil wire portion 31a. The cross-sectional area of each 2nd coil wire portion 32a is the same as that of the other.

[0054] As shown in Figure 3 One end portion 31c connected to the 2nd winding body 32 is led obliquely from one of the pair of 1st axial extension portions 31b toward the one side (+Z1 side) in the motor axial direction. One end portion 32c connected to the 1st winding body 31 is led obliquely from one of the pair of 2nd axial extension portions 32b toward the one side in the motor axial direction. The 1st axial extension portion 31b from which the one end portion 31c is led and the 2nd axial extension portion 32b from which the one end portion 32c is led are located on opposite sides in the motor circumferential direction with the tooth 22 interposed therebetween.

[0055] Although illustration is omitted, the cross-sectional shape of the portion of the flat wire that constitutes the 1st winding body 31 other than the 1st axial extension portion 31b is, for example, a rounded square. The cross-sectional shape of the portion of the flat wire that constitutes the 2nd winding body 32 other than the 2nd axial extension portion 32b is, for example, a rounded square.

[0056] As shown in Figure 2 The insulating member 40 is, for example, a sheet-like insulating member. The insulating member 40 can be an insulating tape or an insulating paper. In the present embodiment, the insulating member 40 is provided with respect to each of the pair of axial extension portions 30b. The insulating member 40 is wound around each of the pair of axial extension portions 30b. In a cross section perpendicular to the motor axial direction, the insulating member 40 provided to the axial extension portion 30b surrounds the axial extension portion 30b. Although illustration is omitted, the insulating member 40 is provided with respect to substantially the entire motor axial direction of the axial extension portion 30b.

[0057] As shown in Figure 4 The manufacturing method of the above-described coil 30 includes a 1st wire winding process S1, a 2nd wire winding process S2, a compression process S3, and a connection process S4. As shown in Figure 5 The 1st wire winding process S1 is a process of winding a flat wire to produce the 1st winding body 131. The 2nd wire winding process S2 is a process of winding a flat wire to produce the 2nd winding body 132. Either the 1st wire winding process S1 or the 2nd wire winding process S2 can be performed first, or both can be performed simultaneously.

[0058] The first winding body 131 is the winding body preceding the first winding body 31 described above. In the first winding body 131, the cross-sectional shape of the plurality of first coil wire portions 131a constituting the first axial extension 131b is a rounded square. The outline shape of the first axial extension 131b in the cross-section perpendicular to the motor axis is, for example, approximately rectangular. The cross-sectional shape of the flat wire constituting the first winding body 131 is the same in any part. The first winding body 131 is a three-layer winding body arranged in two rows along the radial direction of the motor.

[0059] The second winding body 132 is the winding body preceding the aforementioned second winding body 32. In the second winding body 132, the cross-sectional shape of the plurality of second coil wire portions 132a constituting the second axial extension 132b is a rounded square. The outline shape of the cross-section of the second axial extension 132b perpendicular to the motor axis is, for example, approximately rectangular. The cross-sectional shape of the flat wire constituting the second winding body 132 is the same in any part. The cross-sectional shape of the flat wire constituting the second winding body 132 is the same as the cross-sectional shape of the flat wire constituting the first winding body 131. The second winding body 132 is a four-layer winding body arranged in two rows along the radial direction of the motor.

[0060] In this embodiment, the first winding process S1 and the second winding process S2 use Figures 6 to 11 The winding is performed using the winding machine 50 shown. That is, the first winding process S1 and the second winding process S2 are processes of winding the winding 33 using the winding machine 50. In this embodiment, the winding 33 is a flat wire. Figure 7 As shown, the winding machine 50 of this embodiment includes a base component 51, a first holding component 61, a second holding component 62, a bearing component 63, a first gripping component 70a, a second gripping component 70b, a winding core 80, a first winding clamp 81, and a second winding clamp 82. Furthermore, as... Figure 8 As shown, the winding machine 50 includes flexible components 65a and 65b. Furthermore, as... Figure 9 As shown, the winding machine 50 includes a first guide section 81d and a second guide section 82d.

[0061] exist Figures 6 to 16 In this text, the Z2 axis represents the direction parallel to the central axis J2 of the winding core 80. Unless otherwise specified, the axial direction of the central axis J2 is simply referred to as the "axial direction," the radial direction centered on the central axis J2 is simply referred to as the "radial direction," and the circumferential direction around the central axis J2 is simply referred to as the "circumferential direction." Furthermore, the positive side (+Z side) of the Z2 axis in the axial direction is referred to as the "upper side," and the negative side (-Z side) of the Z2 axis in the axial direction is referred to as the "lower side." In this embodiment, the upper side corresponds to "one side of the axial direction," and the lower side corresponds to "the other side of the axial direction."

[0062] In addition, a direction parallel to the X-axis in each drawing in the direction perpendicular to the axial direction is referred to as a "left-right direction X", and a direction parallel to the Y-axis in each drawing in the direction perpendicular to the axial direction is referred to as a "front-rear direction Y". The left-right direction X and the front-rear direction Y are directions perpendicular to each other. A positive side (+X side) in the left-right direction X is referred to as a "right side", and a negative side (-X side) in the left-right direction X is referred to as a "left side". A positive side (+Y side) in the front-rear direction Y is referred to as a "front side", and a negative side (-Y side) in the front-rear direction Y is referred to as a "rear side".

[0063] In addition, the left-right direction, the front-rear direction, the upper side, the lower side, the right side, the left side, the front side, and the rear side are merely names for explaining the positional relationship and the like of each portion, and the actual positional relationship and the like can be a positional relationship and the like other than the positional relationship and the like indicated by these names.

[0064] The following description of the positional relationship of each portion of the winding machine 50 is made with respect to an initial state in which the winding 33 is mounted to the winding machine 50 and before the winding 33 starts to be wound. Figure 6 And Figure 7 The winding machine 50 in the case of the initial state is shown.

[0065] As shown in Figure 6 And Figure 7 The base member 51 extends in the direction perpendicular to the axial direction. As shown in Figure 7 The first winding jig 81 is fixed to the central portion of the base member 51 by the bolt 52.

[0066] The first winding jig 81 is a columnar shape extending in the axial direction. The first winding jig 81 is, for example, a cylindrical shape with the center axis J2 as the center. The first winding jig 81 protrudes upward from the central portion of the base member 51. The first winding jig 81 has a first winding jig main body 81a and a first support portion 81b.

[0067] The first winding jig main body 81a is a cylindrical shape with the center axis J2 as the center. The first winding jig main body 81a has a first hole portion 81c recessed from the upper side of the first winding jig main body 81a toward the lower side. In the present embodiment, the first hole portion 81c penetrates the first winding jig main body 81a in the axial direction. The center axis J2 passes inside the first hole portion 81c. As shown in Figure 8 The first hole portion 81c is, for example, a rounded rectangular hole shape that is longer in the front-rear direction Y. In addition, the first hole portion 81c can be a hole having a bottom on the lower side.

[0068] As shown in Figure 7As shown, the first support portion 81b is located inside the first hole portion 81c. The first support portion 81b protrudes, for example, from the inner peripheral surface of the first hole portion 81c to the radially inner side. The first support portion 81b is located, for example, at the upper side in the inside of the first hole portion 81c.

[0069] In the present embodiment, the second winding jig 82 is located at the upper side of the first winding jig 81. The first winding jig 81 and the second winding jig 82 are arranged to sandwich the winding core 80 in the axial direction. The second winding jig 82 is arranged at the upper side of the first winding jig 81 in a manner separated by a gap. The axial-direction interval of the first winding jig 81 and the second winding jig 82 is greater than twice the thickness of the winding 33 and less than three times the thickness of the winding 33. The second winding jig 82 is columnar extending in the axial direction. The second winding jig 82 is, for example, cylindrical with the center axis J2 as the center. The outer diameter of the second winding jig 82 is, for example, the same as the outer diameter of the first winding jig 81. The second winding jig 82 has a second winding jig body 82a and a second support portion 82b.

[0070] The second winding jig body 82a is cylindrical with the center axis J2 as the center. The second winding jig body 82a has a second hole portion 82c recessed from the lower side of the second winding jig body 82a toward the upper side. In the present embodiment, the second hole portion 82c penetrates the second winding jig body 82a in the axial direction. The center axis J2 passes through the inside of the second hole portion 82c. As shown, Figure 6 The second hole portion 82c is, for example, a rounded rectangular hole that is longer in the front-rear direction Y. Alternatively, the second hole portion 82c can be a hole having a bottom on the upper side.

[0071] As shown, Figure 7 The second support portion 82b is located inside the second hole portion 82c. The second support portion 82b protrudes, for example, from the inner peripheral surface of the second hole portion 82c to the radially inner side. The second support portion 82b is located, for example, at the lower side in the inside of the second hole portion 82c.

[0072] The winding core 80 is wound with the winding 33. The winding core 80 is columnar extending in the axial direction with the center axis J2 as the center. As shown, Figure 12 The winding core 80 is, for example, substantially quadrangular prism-shaped that is longer in the front-rear direction Y and flat in the left-right direction X. As shown, Figure 7 The winding core 80 is located between the first winding jig 81 and the second winding jig 82 in the axial direction. The lower side portion of the winding core 80 is inserted into the first hole portion 81c from the upper side. The lower side portion of the winding core 80 is fitted in the first hole portion 81c. The upper side portion of the winding core 80 is inserted into the second hole portion 82c from the lower side. The upper side portion of the winding core 80 is fitted in the second hole portion 82c.

[0073] The upper portion of the winding core 80 is secured to the second winding clamp 82, for example, by a set screw 83. The set screw 83 is screwed radially inward from the outer peripheral surface of the second winding clamp 82. The radially inward end of the set screw 83 is pressed against the side of the winding core 80 in the left-right direction X. The axial central portion of the winding core 80 is exposed in the axial gap between the first winding clamp 81 and the second winding clamp 82.

[0074] The lower end of the winding core 80 contacts the first support portion 81b from the upper side within the first hole portion 81c. The upper end of the winding core 80 contacts the second support portion 82b from the lower side within the second hole portion 82c. Thus, the winding core 80, the first winding clamp 81, and the second winding clamp 82 are axially positioned relative to each other. The first winding clamp 81 and the second winding clamp 82 protrude radially outward from the winding core 80. That is, the radially outer edge of the first winding clamp 81 and the radially outer edge of the second winding clamp 82 are located radially outward from the winding core 80.

[0075] like Figure 9 As shown, the first guide portion 81d is located around the winding core 80. In this embodiment, the first guide portion 81d protrudes from the first winding jig 81 toward the second winding jig 82. More specifically, the first guide portion 81d protrudes upward from the periphery of the first hole portion 81c in the upper surface of the first winding jig body 81a. The first guide portion 81d and the first winding jig 81 are, for example, part of the same single component. The first guide portion 81d is, for example, located behind (-Y side) the first hole portion 81c. The radially inner surface of the first guide portion 81d contacts the outer peripheral surface of the winding core 80. That is, the first guide portion 81d is connected to the outer peripheral surface of the winding core 80. For example, when viewed axially, the radially outer surface of the first guide portion 81d has the same shape as the portion of the outer peripheral surface of the winding core 80 in which the first guide portion 81d contacts. The radially outer surface of the first guide portion 81d is, for example, a curved surface that is slightly curved in a direction that protrudes toward the rear.

[0076] The first guide portion 81d has a first guide surface 81e and a first top surface 81f. The first guide surface 81e is an upward-facing surface. The first guide surface 81e is an inclined surface located on the upper side facing the circumferential direction. In this embodiment, the circumferential side is the side that advances counterclockwise around the central axis J2 when viewed from above. The first top surface 81f is connected to the end of the circumferential side of the first guide surface 81e. The first top surface 81f is, for example, a flat surface facing upward and perpendicular to the axial direction. In this embodiment, the first guide surface 81e and the first top surface 81f constitute the upper surface of the first guide portion 81d.

[0077] The second guide portion 82d is located around the winding core 80. In this embodiment, the second guide portion 82d protrudes from the second winding jig 82 toward the first winding jig 81. More specifically, the second guide portion 82d protrudes downward from the periphery of the second hole portion 82c in the lower surface of the second winding jig body 82a. The second guide portion 82d and the second winding jig 82 are, for example, part of the same single component. The second guide portion 82d is, for example, located behind (-Y side) the second hole portion 82c. The radially inner surface of the second guide portion 82d contacts the outer peripheral surface of the winding core 80. That is, the second guide portion 82d is connected to the outer peripheral surface of the winding core 80. For example, when viewed axially, the radially outer surface of the second guide portion 82d has the same shape as the portion of the outer peripheral surface of the winding core 80 in which the second guide portion 82d contacts. The radially outer surface of the second guide portion 82d is, for example, a curved surface that is slightly curved in a direction that protrudes toward the rear.

[0078] The second guide portion 82d has a second guide surface 82e and a second top surface 82f. The second guide surface 82e is a downward-facing surface. The second guide surface 82e is an inclined surface located on the upper side as it faces the circumferential direction. The shape of the second guide surface 82e is the same as the shape of the first guide surface 81e. The first guide surface 81e and the second guide surface 82e are arranged opposite each other in the axial direction with a gap.

[0079] The second top surface 82f is connected to the end of the second guide surface 82e on the other side of the circumferential direction. In this embodiment, the other side of the circumferential direction is the side that moves clockwise around the central axis J2 when viewed from above. The second top surface 82f is, for example, a flat surface facing downward and perpendicular to the axial direction. The first top surface 81f and the second top surface 82f are arranged separately in the circumferential direction. For example, when viewed axially, a portion of the first top surface 81f overlaps with the end of the second guide surface 82e on one side of the circumferential direction. For example, when viewed axially, a portion of the second top surface 82f overlaps with the end of the first guide surface 81e on the other side of the circumferential direction. The first guide portion 81d and the second guide portion 82d are arranged in opposite directions in the axial direction, for example, having the same shape as each other.

[0080] like Figure 7 and Figure 8 As shown, the first retaining member 61 is the member that retains the first gripping member 70a. The first retaining member 61 is located above the base member 51. The first retaining member 61 is supported from below by the base member 51. Figure 8 As shown, the first retaining member 61 is annular, surrounding the first winding clamp 81. The outer peripheral surface of the first retaining member 61 is, for example, annular with the central axis J2 as the center. The first retaining member 61 has a first annular portion 61c, a first bearing portion 61b, a plurality of first connecting portions 61d, and a pair of protruding wall portions 61j.

[0081] The first annular portion 61c is annular around the center axis J2. The first annular portion 61c is, for example, a torus shape with the center axis J2 as the center. The first annular portion 61c has a first guide hole 61i through an end portion of the left side (-X side) of the first annular portion 61c in the left-right direction X. The first guide hole 61i is open to the upper side.

[0082] The first bearing portion 61b is located at a position radially inward of the first annular portion 61c. The first bearing portion 61b is, for example, a substantially rectangular shape that is long in the front-rear direction Y when viewed in the axial direction. The first bearing portion 61b has a first bearing hole 61e that passes through the first bearing portion 61b in the axial direction. The first bearing hole 61e is a substantially circular hole with the center axis J2 as the center. The first bearing hole 61e is, for example, open to the left side (-X side). The first winding jig 81 is fitted to the radially inner side of the first bearing hole 61e. The first winding jig 81 supports the first holding member 61 so as to be rotatable around the center axis J2 via the inner peripheral surface of the first bearing hole 61e. In the present embodiment, the first holding member 61 is bidirectionally rotatable around the center axis J2.

[0083] The first bearing portion 61b has a pair of guide grooves 61f, 61g. The guide grooves 61f, 61g are recessed from the face of the upper side of the first bearing portion 61b to the lower side and extend in the front-rear direction Y. The guide groove 61f is disposed in the front-rear direction Y across the center axis J2 from the guide groove 61g. The guide groove 61f is located on the front side (+Y side) of the first bearing hole 61e. The end portion of the rear side (-Y side) of the guide groove 61f is open to the inner side of the first bearing hole 61e. The guide groove 61g is located on the rear side of the first bearing hole 61e. The end portion of the front side of the guide groove 61g is open to the radially inner side of the first bearing hole 61e.

[0084] The first bearing portion 61b has a pair of receiving grooves 61h. The receiving grooves 61h are recessed from the face of the upper side of the first bearing portion 61b to the lower side and extend in the left-right direction X. The end portion of the left side (-X side) of the receiving groove 61h is open to the side surface on the left side of the first bearing portion 61b. The pair of receiving grooves 61h are disposed in the front-rear direction Y across the first bearing hole 61e. The pair of receiving grooves 61h are located at positions radially outward of the pair of guide grooves 61f, 61g. The pair of receiving grooves 61h respectively receive the elastic members 65a, 65b. The elastic members 65a, 65b are, for example, coil springs that extend in the left-right direction X. The front-rear direction Y width of the pair of receiving grooves 61h narrows in the upper side opening portion. Thereby, the elastic members 65a, 65b are inhibited from being pulled out to the upper side from the receiving grooves 61h.

[0085] The plurality of first link portions 61d is located between the first bearing portion 61b and the first annular portion 61c in the radial direction. The plurality of first link portions 61d connects the first bearing portion 61b and the first annular portion 61c. The plurality of first link portions 61d extends from the radially outer side surface of the first bearing portion 61b to the radially inner side surface of the first annular portion 61c. The plurality of first link portions 61d is disposed at intervals in the circumferential direction.

[0086] A pair of protruding wall portions 61j protrudes upward from different first link portions 61d, respectively. The pair of protruding wall portions 61j is disposed separately on the left side (-X side) of the first bearing portion 61b. The pair of protruding wall portions 61j is disposed separately on the left side of each of the pair of receiving grooves 61h, respectively. The pair of protruding wall portions 61j is disposed across the pair of rollers 72, 73 described later in the front-rear direction Y.

[0087] The first holding member 61 has a pair of pressing members 64 disposed across the pair of protruding wall portions 61j in the front-rear direction Y. The pair of pressing members 64 is fixed to the upper side surface of different first link portions 61d, respectively. The pressing member 64 is fixed to the first link portion 61d, for example, by a bolt.

[0088] The second holding member 62 is a member that holds the second gripping member 70b. As shown in FIG. 1, the second holding member 62 is located above the first holding member 61. The second holding member 62 is supported by the first holding member 61 from below. As shown in FIG. 1, the second holding member 62 is annular to surround the second winding jig 82. The upper side end portion of the second winding jig 82 protrudes upward, for example, than the upper side surface of the second holding member 62. The outer peripheral surface of the second holding member 62 is circular, for example, with the center axis J2 as the center. The outer diameter of the second holding member 62 is the same as the outer diameter of the first holding member 61, for example. The second holding member 62 has a second annular portion 62c, a second bearing portion 62b, and a plurality of second link portions 62d. Figure 7 Figure 6 The second holding member 62 is annular to surround the second winding jig 82. The upper side end portion of the second winding jig 82 protrudes upward, for example, than the upper side surface of the second holding member 62. The outer peripheral surface of the second holding member 62 is circular, for example, with the center axis J2 as the center. The outer diameter of the second holding member 62 is the same as the outer diameter of the first holding member 61, for example. The second holding member 62 has a second annular portion 62c, a second bearing portion 62b, and a plurality of second link portions 62d.

[0089] The second annular portion 62c is annular to surround the center axis J2. The second annular portion 62c is circular, for example, with the center axis J2 as the center. The second annular portion 62c overlaps the first annular portion 61c when viewed in the axial direction. The second annular portion 62c has a second guide hole 62i that penetrates the end portion of the right (+X side) of the second annular portion 62c in the left-right direction X. The second guide hole 62i is open to the lower side.

[0090] ​The second bearing portion 62b is located radially inside the second annular portion 62c. For example, when viewed axially, the second bearing portion 62b is a generally rectangular shape that is longer in the front-rear direction Y. The second bearing portion 62b has a fitting hole 62e that extends axially through the second bearing portion 62b. The fitting hole 62e is, for example, a rectangular hole that is longer in the front-rear direction Y. Although not shown in the figure, the second bearing portion 62b has a pair of receiving grooves on its lower surface. The receiving grooves of the second bearing portion 62b respectively receive elastic members (not shown).

[0091] A plurality of second connecting portions 62d are located radially between the second bearing portion 62b and the second annular portion 62c. The plurality of second connecting portions 62d connect the second bearing portion 62b and the second annular portion 62c. The plurality of second connecting portions 62d extend from the radially outer side surface of the second bearing portion 62b to the radially inner side surface of the second annular portion 62c. The plurality of second connecting portions 62d are arranged circumferentially spaced apart.

[0092] The bearing component 63 is a generally rectangular parallelepiped-shaped component that is longer along the front-rear direction Y. The bearing component 63 is fitted into the fitting hole 62e. The bearing component 63 is mounted to the second retaining component 62 in a manner that prevents relative rotation about the central axis J2. The upper end of the bearing component 63 protrudes upward beyond the upper surface of the second retaining component 62.

[0093] The bearing component 63 has a second bearing hole 63a that extends axially through the bearing component 63. The second bearing hole 63a is a generally circular hole centered on the central axis J2. The second bearing hole 63a opens, for example, to the right (+X side). A second winding clamp 82 engages with the radially inner side of the second bearing hole 63a. The second winding clamp 82 supports the bearing component 63 and the second retaining component 62 via the inner circumferential surface of the second bearing hole 63a, enabling them to rotate about the central axis J2. In this embodiment, the second retaining component 62 is capable of bidirectional rotation about the central axis J2. Thus, the first retaining component 61 and the second retaining component 62 are capable of rotating about the central axis J2 in opposite directions.

[0094] like Figure 7 As shown, the first gripping member 70a and the second gripping member 70b are located radially outside the winding core 80. Figure 6 and Figure 7 In the initial state shown, when viewed axially, the first gripping member 70a and the second gripping member 70b are positioned across the central axis J2 in the left-right direction X. The first gripping member 70a is located radially outside the first winding clamp 81. The second gripping member 70b is located radially outside the second winding clamp 82. In the initial state, the first gripping member 70a is located to the left (-X side) of the first winding clamp 81. In the initial state, the second gripping member 70b is located to the right (+X side) of the second winding clamp 82.

[0095] The first gripping member 70a is held above the first retaining member 61. The second gripping member 70b is held below the second retaining member 62. The first gripping member 70a and the second gripping member 70b are axially offset. The first gripping member 70a is located below the second gripping member 70b.

[0096] The first gripping member 70a and the second gripping member 70b have the same construction. The first gripping member 70a and the second gripping member 70b are arranged in opposite directions in the axial direction. In the following description, sometimes only the first gripping member 70a is described to represent the first gripping member 70a and the second gripping member 70b.

[0097] like Figure 8 As shown, the first gripping member 70a has a substrate 71, a pair of rollers 72 and 73, and a pair of clamping members 74 and 75. The substrate 71 is located radially outside the first winding jig 81. The substrate 71 has a radial extension 71a, a pair of first arms 71b and 71c, and a pair of second arms 71d and 71e. The radial extension 71a extends radially. In the initial state, the direction in which the radial extension 71a extends is, for example, the left-right direction X. The radial extension 71a is, for example, a quadrangular prism shape.

[0098] A pair of first arms 71b and 71c extend from the radially inner end of the radial extension 71a to both sides in a front-rear direction Y, perpendicular to both the direction of extension of the radial extension 71a and the axial direction. For example, the first arm 71b extends forward (+Y side) from the radially inner end of the radial extension 71a. For example, the first arm 71c extends rearward (-Y side) from the radially inner end of the radial extension 71a. The pair of first arms 71b and 71c are respectively connected to the first bearing portion 61b in the left-right direction X via a pair of protruding wall portions 61j. The pair of first arms 71b and 71c are supported from below by the first connecting portion 61d.

[0099] A pair of second arms 71d and 71e extend from the front ends of a pair of first arms 71b and 71c in the left-right direction X along the radial extension 71a. The second arm 71d extends to the left (-X side) from the front (+Y side) end of the first arm 71b. The second arm 71e extends to the left from the rear (-Y side) end of the first arm 71c. The pair of second arms 71d and 71e are positioned with a pair of protruding walls 61j between them in the front-rear direction Y. The pair of second arms 71d and 71e are located between the protruding walls 61j and the pressing member 64 in the front-rear direction Y. A portion of the pair of second arms 71d and 71e is covered from above by the pressing member 64. Therefore, even if the first gripping member 70a moves upward, the pair of second arms 71d and 71e will hook onto the pressing member 64. This prevents the first gripping member 70a from disengaging from the first holding member 61 to the upward side.

[0100] A pair of rollers 72 and 73 are arranged with a radial extension 71a between them in the front-to-back direction Y. Roller 72 is located, for example, in front of the radial extension 71a (+Y side). Roller 73 is located, for example, in rear of the radial extension 71a (-Y side). Roller 72 is rotatable about a rotation axis R2. Roller 73 is rotatable about a rotation axis R3. In this embodiment, the rotation axes R2 and R3 are parallel to the central axis J2. That is, in this embodiment, the axial directions of the rotation axes R2 and R3 are the axial directions of the central axis J2.

[0101] like Figure 10 As shown, roller 72 has a cylindrical portion 72a, a first roller portion 72b, and a second roller portion 72c. The cylindrical portion 72a is a cylinder that opens axially to both sides with the rotation axis R2 as its center. The outer circumferential surface of the cylindrical portion 72a is cylindrical. The inner circumferential surface of the cylindrical portion 72a is hexagonal. The first roller portion 72b extends radially outward from the upper end of the cylindrical portion 72a, centered on the rotation axis R2. The first roller portion 72b is annular, centered on the rotation axis R2. The first roller portion 72b can be, for example, a plate with its surface facing axially.

[0102] like Figure 11As shown, the outer peripheral surface of the first roller portion 72b is a contact portion 72f that can contact the winding 33 radially about the rotation axis R2 of the roller 72. That is, the roller 72 has a contact portion 72f. The outer peripheral surface of the first roller portion 72b is provided with a pair of eaves 72d and 72e. That is, the roller 72 has a pair of eaves 72d and 72e. The pair of eaves 72d and 72e protrude radially outward from the contact portion 72f about the rotation axis R2 of the roller 72. The pair of eaves 72d and 72e are annular about the rotation axis R2. The pair of eaves 72d and 72e are arranged opposite each other at a distance from each other in the axial direction of the rotation axis R2. For example, the eave 72d is located at the upper end of the contact portion 72f. For example, the eave 72e is located at the lower end of the contact portion 72f. A pair of eaves 72d and 72e clamp the front (+Y side) edge of the winding 33 in the axial direction.

[0103] like Figure 10 As shown, the second roller portion 72c extends radially outward from the lower end of the cylindrical portion 72a, centered on the rotation axis R2. The second roller portion 72c is annular, centered on the rotation axis R2. The second roller portion 72c is, for example, a plate with its surface facing axially. The outer diameter of the second roller portion 72c is, for example, larger than the outer diameter of the first roller portion 72b. The radial extension portion 71a and the protrusion 74c (described later) are located axially between the first roller portion 72b and the second roller portion 72c. The first roller portion 72b and the second roller portion 72c axially sandwich the front (+Y side) portion of the radial extension portion 71a.

[0104] In this embodiment, the shape of roller 73 is the same as that of roller 72. Like roller 72, roller 73 has a cylindrical portion 73a, a first roller portion 73b, and a second roller portion 73c. ​​A radial extension 71a and a protrusion 75c (described later) are located axially between the first roller portion 73b and the second roller portion 73c. ​​The first roller portion 73b and the second roller portion 73c axially clamp the rear (-Y side) portion of the radial extension 71a. Figure 11 As shown, roller 73 is the same as roller 72, having a contact portion 73f and a pair of eaves 73d and 73e. That is, each of the rollers 72 and 73 has a contact portion and a pair of eaves. The pair of eaves 73d and 73e clamp the rear edge of the winding 33 in the axial direction.

[0105] The first roller section 72b and the first roller section 73b can clamp and hold the winding 33 in the front-rear direction Y. Thus, a pair of rollers 72 and 73 can clamp and hold the winding 33. When the winding 33 is held by the pair of rollers 72 and 73, the contact portions 72f and 73f respectively contact the winding 33 radially about the rotation axes R2 and R3, and clamp the winding 33. Figure 10As shown, the second roller section 72c and the second roller section 73c are in contact with each other radially with the rotation axes R2 and R3 as the center.

[0106] like Figure 8 As shown, a pair of clamping members 74 and 75 are arranged to clamp a radial extension 71a and a pair of rollers 72 and 73 in the front-rear direction Y. The clamping member 74 is located on the front side (+Y side) of the radial extension 71a and the rollers 72. The clamping member 75 is located on the rear side (-Y side) of the radial extension 71a and the rollers 73.

[0107] The clamping member 74 has a straight portion 74a, a curved portion 74b, and a protruding portion 74c. The straight portion 74a extends in the left-right direction X along the radial extension 71a. The straight portion 74a is located in front of the radial extension 71a (+Y side). The straight portion 74a has a portion that clamps the front portion of the radial extension 71a in the axial direction. The curved portion 74b is connected to the radially inner end of the straight portion 74a. The curved portion 74b is located in front of the roller 72. The curved portion 74b extends circumferentially about the rotation axis R2. When viewed in the axial direction, the curved portion 74b bends in a forward-protruding direction.

[0108] The protrusion 74c protrudes from the curved portion 74b toward the radial extension 71a. The protrusion 74c protrudes rearward (to the -Y side) from the curved portion 74b, for example. The protrusion 74c is located axially between the first roller portion 72b and the second roller portion 72c. The protrusion 74c has a bearing recess 74e that is recessed away from the radial extension 71a. The bearing recess 74e is recessed forward (to the +Y side) from the rear end of the protrusion 74c. Figure 10 As shown, the cylindrical portion 72a is located inside the bearing recess 74e. The inner surface of the bearing recess 74e supports the cylindrical portion 72a so that it can rotate about the rotation axis R2. The inner surface of the bearing recess 74e is pressed from the front by the outer peripheral surface of the cylindrical portion 72a. The cylindrical portion 72a is clamped by the protrusion 74c and the radial extension 71a in the front-rear direction Y.

[0109] The shape of the clamping member 75 is arranged in a manner that is approximately symmetrical to the shape of the clamping member 74 in the front-rear direction Y. The clamping member 75 has a straight portion 75a, a curved portion 75b, and a protruding portion 75c. The straight portion 75a extends in the left-right direction X along the radial extension 71a. The straight portion 75a is located on the rear side (-Y side) of the radial extension 71a. The straight portion 75a has a portion that clamps the rear portion of the radial extension 71a in the axial direction. The curved portion 75b is connected to the radially inner end of the straight portion 75a. The curved portion 75b is located on the rear side of the roller 73. The curved portion 75b extends circumferentially about the rotation axis R3. When viewed in the axial direction, the curved portion 75b bends in a rearward protruding direction.

[0110] The protrusion 75c protrudes from the bent portion 75b toward the radial extension 71a. The protrusion 75c protrudes, for example, toward the front side (+Y side) from the bent portion 75b. The protrusion 74c is located between the axial directions of the 1st roller portion 73b and the 2nd roller portion 73c. The protrusion 75c has a bearing recess 75e recessed toward the direction away from the radial extension 71a. The bearing recess 75e is recessed toward the rear side (-Y side) from the end portion of the front side of the protrusion 75c. The cylindrical portion 73a is located inside the bearing recess 75e. The inside surface of the bearing recess 75e supports the cylindrical portion 73a so as to be rotatable around the rotation axis R3. The inside surface of the bearing recess 75e is pressed from the rear side by the outer peripheral surface of the cylindrical portion 73a. The cylindrical portion 73a is sandwiched in the front-rear direction Y by the protrusion 75c and the radial extension 71a.

[0111] The clamping member 75 has a through-hole 75d that penetrates the straight portion 75a in the front-rear direction Y. The bolt 79 passes through the through-hole 75d from the rear side (-Y side). The bolt 79 penetrates the through-hole 71h provided to the radial extension 71a in the front-rear direction Y and is screwed into the internally threaded hole 74d provided to the straight portion 74a of the clamping member 74. The more the bolt 79 is screwed in, the closer the clamping members 74, 75 approach each other in the front-rear direction Y. The more the bolt 79 is screwed in, the more the cylindrical portion 72a of the roller 72 is pressed toward the radial extension 71a by the inside surface of the bearing recess 74e in the protrusion 74c. The more the bolt 79 is screwed in, the more the cylindrical portion 73a of the roller 73 is pressed toward the radial extension 71a by the inside surface of the bearing recess 75e in the protrusion 75c.

[0112] Thus, by adjusting the amount of screwing in of the bolt 79, it is possible to adjust the frictional force around the rotation axis R2, R3 that is generated between the outer peripheral surface of the cylindrical portion 72a, 73a of the roller 72, 73 and the inside surface of the bearing recess 74e, 75e and the side surface in the front-rear direction Y of the radial extension 71a. In the following description, the frictional force around the rotation axis R2, R3 that is generated between the outer peripheral surface of the cylindrical portion 72a, 73a of the roller 72, 73 and the inside surface of the bearing recess 74e, 75e and the side surface in the front-rear direction Y of the radial extension 71a will be referred to as the "rotational static frictional force of the roller 72, 73".

[0113] In addition, by adjusting the amount of screwing in of the bolt 79, it is also possible to adjust the force by which the 1st roller portions 72b, 73b sandwich the winding 33. That is, by adjusting the amount of screwing in of the bolt 79, it is possible to adjust the frictional force in the radial direction that is generated between the 1st roller portions 72b, 73b and the winding 33. In the following description, the frictional force in the radial direction that is generated between the 1st roller portions 72b, 73b and the winding 33 will be referred to as the "holding static frictional force of the winding 33".

[0114] In the present embodiment, the second roller portions 72c, 73c contact each other in the front-rear direction Y, and thus can receive a part of the tightening force resulting from the screwing of the bolt 79 by the second roller portions 72c, 73c. Thereby, it is possible to suppress the load applied to the cylindrical portions 72a, 73a and the first roller portions 72b, 73b from becoming excessively large, and thus it is possible to appropriately adjust the rotational static friction of the rollers 72, 73 and the holding static friction of the winding 33.

[0115] The first gripping member 70a is held to the first holding member 61 in a manner that is movable in the radial direction within a range in which the pair of first arm portions 71b, 71c are movable between the first bearing portion 61b and the protruding wall portion 61j. As shown in FIG. 6, the first gripping member 70a is held to the first holding member 61 in a manner that is movable in the radial direction within a range in which the pair of first arm portions 71b, 71c are movable between the first bearing portion 61b and the protruding wall portion 61j. Figure 8 As shown in FIG. 6, the radially outer portion of the first gripping member 70a passes through the first guide hole 61i in the radial direction. The radially outer portion of the first gripping member 70a is fitted in the first guide hole 61i. In the present embodiment, the radially outer portion of the first gripping member 70a includes the radially outer portion of the radially extending portion 71a and the radially outer portions of the straight portions 74a, 75a. The end portion of the first gripping member 70a radially outside is protruded radially outward of the first holding member 61.

[0116] The first gripping member 70a is applied with the elastic force FE toward the radially outer side by the elastic members 65a, 65b. That is, the elastic members 65a, 65b apply a force to the pair of rollers 72, 73 in a direction away from the winding core 80. In the initial state, the elastic member 65a applies the elastic force FE toward the left side (-X direction) to the first arm portion 71b. The elastic member 65b applies the elastic force FE toward the left side to the first arm portion 71c.

[0117] The total value of the elastic forces FE applied by the two elastic members 65a, 65b is smaller than the holding static friction of the winding 33. Also, the elastic forces FE of the two elastic members 65a, 65b are applied to the first gripping member 70a, and the rotational torque generated in the rollers 72, 73 is smaller than the rotational static friction of the rollers 72, 73. Therefore, even if the elastic forces FE are applied to the rollers 72, 73 by the elastic members 65a, 65b, the rollers 72, 73 do not rotate around the rotational axes R2, R3, and no sliding occurs between the rollers 72, 73 and the winding 33. Thereby, it is possible to hold and pull the winding 33 by the pair of rollers 72, 73, and thus it is possible to apply the tension T to the winding 33. The magnitude of the tension T is the magnitude obtained by adding the magnitudes of the elastic forces FE applied by the two elastic members 65a, 65b.

[0118] As shown in FIG. 6, the radially outer portion of the first gripping member 70a passes through the first guide hole 61i in the radial direction. The radially outer portion of the first gripping member 70a is fitted in the first guide hole 61i. In the present embodiment, the radially outer portion of the first gripping member 70a includes the radially outer portion of the radially extending portion 71a and the radially outer portions of the straight portions 74a, 75a. The end portion of the first gripping member 70a radially outside is protruded radially outward of the first holding member 61. Figure 6As shown, the second gripping member 70b has a pair of rollers 77, 78 capable of gripping the winding 33. The pair of rollers 77, 78 are located slightly upward and sideways away from the pair of rollers 72, 73 of the first gripping member 70a. The second gripping member 70b, like the first gripping member 70a, is held in the second holding member 62 in a radially movable manner. The radially outer portion of the second gripping member 70b passes radially through the second guide hole 62i. The radially outer portion of the second gripping member 70b engages with the second guide hole 62i. The radially outer end of the second gripping member 70b protrudes radially outward beyond the second holding member 62.

[0119] As described above, the first holding member 61 and the second holding member 62 are capable of bidirectional rotation about the central axis J2. Therefore, the first gripping member 70a held in the first holding member 61 and the second gripping member 70b held in the second holding member 62 are also capable of bidirectional rotation about the central axis J2. Thus, in this embodiment, the first gripping member 70a and the second gripping member 70b are capable of rotating about the central axis J2 in opposite directions.

[0120] In this embodiment, workers use the winding machine 50 to manufacture the first winding body 131 and the second winding body 132. The following description will illustrate an example of manufacturing the second winding body 132 using the winding machine 50. Furthermore, in this specification, "workers" includes both the workers performing the various operations and the assembly equipment. Each operation may be performed by only the workers, only by the assembly equipment, or by both the workers and the assembly equipment.

[0121] With the first gripping member 70a and the second gripping member 70b gripping the winding 33, the workers assemble the first holding member 61 holding the first gripping member 70a and the second holding member 62 holding the second gripping member 70b onto the base member 51. Figure 12 As shown, at this time, the second winding jig 82, the winding core 80, and the bearing component 63 are not assembled. Furthermore, when viewed axially, the winding 33 extends in a straight line from the first holding member 70a to the second holding member 70b. In this state, the winding 33 passes through the first hole 81c of the first winding jig 81.

[0122] Next, the workers assemble the second winding jig 82, which has the winding core 80 fixed in place. The workers insert the winding core 80 into the guide groove 61g from above and move the winding core 80 and the second winding jig 82 rearward (towards-Y) along the guide groove 61g. This engages the winding core 80 within the first hole 81c. At this point, the winding core 80 bends the portion of the winding 33 located in the first hole 81c rearward. Thus, as... Figure 13As shown, the portion of the winding 33 located between the portion held by the first holding member 70a and the portion held by the second holding member 70b is slightly bent toward the rear.

[0123] In this state, the portion of the winding 33 that contacts the rear (-Y side) end of the winding core 80 is located between the first guide portion 81d and the second guide portion 82d axially. For example... Figure 9 As shown, the portion of winding 33 that contacts the rear end of winding core 80 is arranged obliquely along the first guide surface 81e and the second guide surface 82e. After assembling winding core 80 and second winding jig 82, workers fit bearing component 63 into fitting hole 62e. Thus, the winding core 80 and second winding jig 82 are assembled. Figure 6 and Figure 7 The winding machine 50 in its initial state is shown.

[0124] The operators rotate the first holding member 61 and the second holding member 62 in opposite directions relative to the initial state of the winding machine 50 about the central axis J2, thereby winding the winding 33 onto the winding core 80. The operators rotate the first holding member 61 clockwise about the central axis J2 when viewed from above, and rotate the second holding member 62 counterclockwise about the central axis J2 when viewed from above. Thus, as... Figures 13 to 15 As shown, the first gripping member 70a and the second gripping member 70b rotate about the central axis J2 in opposite directions, thereby winding the winding 33 around the winding core 80. This is achieved by repeating... Figures 13 to 15 The steps shown are for making such a product. Figure 16 The second winding body 132 is obtained by winding the winding core 80 as shown.

[0125] exist Figure 16 In the diagram, the cross-sections of the plurality of second coil wire portions 132a in the second winding body 132 are shown imaginary to illustrate the winding sequence. The lower second coil wire portion 132a, which is stacked in two layers along the axial direction, is wound onto the winding core 80 via the first holding member 70a. The upper second coil wire portion 132a, which is stacked in two layers along the axial direction, is wound onto the winding core 80 via the second holding member 70b.

[0126] When the winding 33 is wound on the winding core 80, the winding 33 is pulled toward the radially inner side. Therefore, the first gripping member 70a that grips the winding 33 is also pulled toward the radially inner side and moved. Thus, the elastic members 65a, 65b are further compressed and deformed, and the elastic force FE applied to the pair of rollers 72, 73 from the elastic members 65a, 65b becomes larger. Further, when the rotational torque applied to the pair of rollers 72, 73 by the elastic force FE is larger than the rotational static friction of the rollers 72, 73, the pair of rollers 72, 73 rotates, and thus the winding 33 is sequentially fed out. Thus, it is possible to feed out the winding 33 in a state where the tension T is appropriately applied to the winding 33. In addition, the holding static friction of the winding 33 is larger than the elastic force FE at the time when the pair of rollers 72, 73 starts to rotate, and thus it is possible to suppress the occurrence of slippage between the winding 33 and the pair of rollers 72, 73. As for the second gripping member 70b, the winding 33 is also fed out from the pair of rollers 77, 78 as with the first gripping member 70a.

[0127] According to the present embodiment, the first gripping member 70a and the second gripping member 70b each have a pair of rollers that can grip the winding 33. At least one of the first gripping member 70a and the second gripping member 70b can rotate around the center axis J2. Thus, by causing the gripping member that can rotate among the first gripping member 70a and the second gripping member 70b to rotate around the center axis J2, it is possible to wind the winding 33 on the winding core 80. At this time, the first winding jig 81 and the second winding jig 82 are arranged in a manner of sandwiching the winding core 80 in the axial direction, and thus it is possible to suppress the movement of the winding 33 in the axial direction by the first winding jig 81 and the second winding jig 82. Further, it is possible to grip the winding 33 by the pair of rollers 72, 73 and the pair of rollers 77, 78, and thus it is possible to apply the tension T to the winding 33 as described above and to feed out the winding 33 by the rotation of each roller. Thus, it is possible to appropriately wind the winding 33 along the outer circumferential surface of the winding core 80. In summary, according to the present embodiment, it is possible to appropriately wind the winding 33 on the winding core 80 even without providing a member or the like that moves in correspondence with the timing of winding the winding 33. Thus, it is possible to make the winding machine 50 simple in configuration, and it is possible to appropriately manufacture the coil 30.

[0128] In addition, according to the present embodiment, the first gripping member 70a and the second gripping member 70b can rotate around the center axis J2 in opposite directions from each other. Thus, it is possible to simultaneously rotate the first gripping member 70a and the second gripping member 70b around the center axis J2 in opposite directions from each other as described above, and thus to wind the winding 33 on the winding core 80. Thus, it is possible to simultaneously wind the winding 33 on the winding core 80 by the first gripping member 70a and the second gripping member 70b even when the winding machine 50 is configured to be simple in configuration. Figure 15When the winding 33 is wound more than one turn around the winding core 80 as shown, the portion of the winding 33 that is fed from the first gripping member 70a and wound around the winding core 80 overlaps with the portion of the winding 33 that is fed from the second gripping member 70b and wound around the winding core 80 in the axial direction. Therefore, the portion of the winding 33 that is wound by one of the first gripping member 70a and the second gripping member 70b can press the portion of the winding 33 that is wound by the other of the first gripping member 70a and the second gripping member 70b in the axial direction.

[0129] Specifically, in the present embodiment, as for the portion of the winding 33 that is wound by the first gripping member 70a, the movement thereof to the lower side is suppressed by the first winding jig 81, and the movement thereof to the upper side is suppressed by the portion of the winding 33 that is wound by the second gripping member 70b. Also, as for the portion of the winding 33 that is wound by the second gripping member 70b, the movement thereof to the upper side is suppressed by the second winding jig 82, and the movement thereof to the lower side is suppressed by the portion of the winding 33 that is wound by the first gripping member 70a. Thereby, the winding of the winding 33 can be appropriately arranged, and thus the coil 30 can be more appropriately manufactured.

[0130] In addition, according to the present embodiment, the winding machine 50 is provided with a first holding member 61 that holds the first gripping member 70a and a second holding member 62 that holds the second gripping member 70b. The first holding member 61 is annular and surrounds the first winding jig 81. The second holding member 62 is annular and surrounds the second winding jig 82. The first holding member 61 and the second holding member 62 are rotatable in opposite directions to each other around the central axis J2. Therefore, by causing the first holding member 61 and the second holding member 62 to counter-rotate around the central axis J2, the first gripping member 70a and the second gripping member 70b can be easily caused to revolve around the central axis J2.

[0131] In addition, according to the present embodiment, the winding machine 50 has a first guide portion 81d located around the winding core 80. The first guide portion 81d has a first guide surface 81e that is located on the upper side as it goes to the side in the circumferential direction of the central axis J2. Therefore, as shown in Figure 9 When the winding 33 is mounted to the winding machine 50, the portion of the winding 33 that contacts the winding core 80 can be disposed obliquely to the axial direction along the first guide surface 81e. Thereby, the portion of the winding 33 that is wound the first turn by the first gripping member 70a and the portion of the winding 33 that is wound the first turn by the second gripping member 70b can be disposed appropriately offset in the axial direction. Therefore, the portions of the winding 33 that are wound the second turn by the first gripping member 70a and the second gripping member 70b and the portions of the winding 33 that are wound the first turn can be easily caused to overlap appropriately in the axial direction.

[0132] Specifically, in the present embodiment, it is easy to make the portion of the winding 33 wound by the first holding member 70a by the second turn enter the lower side of the portion wound by the second holding member 70b by the first turn. Also, it is easy to make the portion wound by the second holding member 70b by the second turn enter the upper side of the portion wound by the first holding member 70a by the first turn.

[0133] Further, the end of the winding 33 wound by the first holding member 70a by the second turn can be supported from the front side (+Y side) by the radially outer side surface of the first guide portion 81d. Therefore, the end of the winding 33 wound by the first holding member 70a by the second turn is inhibited from entering the lower side of the portion of the winding 33 disposed obliquely along the first guide portion 81d. Therefore, the portion of the winding 33 wound by the first holding member 70a by the third turn can be made to appropriately overlap the outer side of the portion of the winding 33 wound by the first holding member 70a by the first turn. Therefore, the winding of the winding 33 can be more appropriately arranged.

[0134] By providing the first guide portion 81d as above, the winding 33 can be inhibited from being displaced, and thus the winding of the winding 33 can be appropriately arranged. Therefore, the winding 33 can be wound at a relatively high speed in a state in which a relatively strong tension T is applied to the winding 33.

[0135] Further, according to the present embodiment, the winding machine 50 has the second guide portion 82d located around the winding core 80. The second guide portion 82d has a second guide surface 82e located on the upper side as it goes toward the one side in the circumferential direction of the central axis J2. The first guide surface 81e and the second guide surface 82e are disposed facing each other with a gap in the axial direction. Therefore, by the first guide surface 81e and the second guide surface 82e, the portion of the winding 33 in contact with the winding core 80 can be more appropriately disposed obliquely inclined toward the axial direction. Thus, the winding of the winding 33 can be more appropriately arranged.

[0136] Further, the end of the winding 33 wound by the second holding member 70b by the second turn can be supported from the front side (+Y side) by the radially outer side surface of the second guide portion 82d. Therefore, the end of the winding 33 wound by the second holding member 70b by the second turn can be inhibited from entering the upper side of the portion of the winding 33 disposed obliquely between the first guide portion 81d and the second guide portion 82d. Therefore, the portion of the winding 33 wound by the second holding member 70b by the third turn can be made to appropriately overlap the outer side of the portion of the winding 33 wound by the second holding member 70b by the first turn. Thus, the winding of the winding 33 can be more appropriately arranged.

[0137] Further, according to the present embodiment, the first guide portion 81d and the second guide portion 82d are connected to the outer circumferential surface of the winding core 80. Therefore, it is easy to make the portion of the winding 33 that contacts the winding core 80 contact the first guide portion 81d and the second guide portion 82d. Thus, the winding 33 can be appropriately guided by the first guide portion 81d and the second guide portion 82d. Therefore, the winding of the winding 33 can be more appropriately arranged.

[0138] Further, according to the present embodiment, the first guide portion 81d protrudes from the first winding jig 81 toward the second winding jig 82, and the second guide portion 82d protrudes from the second winding jig 82 toward the first winding jig 81. Therefore, by changing the interval of the first winding jig 81 and the second winding jig 82 in the axial direction, the interval of the first guide portion 81d and the second guide portion 82d in the axial direction can be easily changed. Thus, even in the case where the thickness of the winding 33 is changed, by changing the interval of the first guide portion 81d and the second guide portion 82d according to the thickness of the winding 33, the winding 33 can be appropriately wound around the winding core 80.

[0139] Further, according to the present embodiment, the roller 72 has the eaves portions 72d, 72e protruding from the contact portion 72f on the outside in the radial direction centered on the rotational axis R2 of the roller 72. The roller 73 has the eaves portions 73d, 73e protruding from the contact portion 73f on the outside in the radial direction centered on the rotational axis R3 of the roller 73. Therefore, by the eaves portions 72d, 72e, 73d, 73e, the winding 33 that contacts the contact portions 72f, 73f can be pressed in the axial direction. Thus, the winding 33 held by the first holding member 70a can be inhibited from being shifted in the axial direction. Also, similarly, by the eaves portions provided to the second holding member 70b, the winding 33 held by the second holding member 70b can be inhibited from being shifted in the axial direction. Therefore, when the winding 33 is wound by the first holding member 70a and the second holding member 70b, when the portion of the winding 33 wound by the first holding member 70a and the portion of the winding 33 wound by the second holding member 70b are offset and cross in the axial direction, the portions of the winding 33 can be inhibited from contacting each other. Therefore, the winding 33 can be more appropriately wound. Also, the winding 33 can be inhibited from being inclined. Thus, the winding 33 can be inhibited from being twisted.

[0140] Furthermore, according to this embodiment, each of the pair of rollers 72 and 73 has a pair of eaves, which are arranged opposite each other at a distance along the axial direction of the rotation axes R2 and R3. Therefore, the winding 33 can be clamped and pressed axially by each of the pair of eaves 72d, 72e and the pair of eaves 73d, 73e. As a result, axial displacement of the winding 33 relative to the pair of rollers 72 and 73 can be further suppressed. Therefore, when winding the winding 33, contact between the portion wound by the first holding member 70a and the portion wound by the second holding member 70b of the winding 33 can be further suppressed. Therefore, the winding 33 can be wound more appropriately. Moreover, tilting of the winding 33 can be further suppressed. As a result, twisting of the winding 33 can be further suppressed.

[0141] Furthermore, according to this embodiment, the winding machine 50 includes elastic members 65a and 65b that apply force to a pair of rollers 72 and 73 in a direction away from the winding core 80. Therefore, the force received from the elastic members 65a and 65b can apply tension T to the winding 33 held by the pair of rollers 72 and 73. Thus, tension T can be easily applied to the winding 33.

[0142] Furthermore, according to this embodiment, the winding 33 wound on the winding core 80 is a flat wire. Therefore, it is easy to arrange the winding 33 relative to the winding core 80.

[0143] like Figure 17 As shown, the second winding body 132, manufactured using a winding machine 50, is provided with a first recess 132d, which is created by providing a first guide portion 81d. The first recess 132d is provided in the circumferential extension 132c of a pair of second axial extensions 132b that connect the ends of the motor axial direction. More specifically, the first recess 132d is provided in the first turn of the circumferential extension 132c. The first recess 132d is recessed radially along the motor. Although not shown in the figure, the second winding body 132 is also provided with a second recess, which is created by providing a second guide portion 82d. The second recess is provided in the portion of the circumferential extension 132c on the side opposite to the side where the first recess 132d is provided in the motor radial direction.

[0144] like Figure 18 As shown, compression step S3 is the step of compressing and deforming the first winding body 131 and the second winding body 132. For example... Figure 4As shown, in the present embodiment, the compression process S3 includes a first compression process S3a and a second compression process S3b. The first compression process S3a is a process of compressively deforming the first winding body 131. The second compression process S3b is a process of compressively deforming the second winding body 132. In the present embodiment, the first compression process S3a and the second compression process S3b are performed earlier than the connection process S4. In addition, either the first compression process S3a or the second compression process S3b can be performed first, or they can be performed simultaneously.

[0145] In the first compression process S3a of the present embodiment, the profile shape on the cross section perpendicular to the motor axis of the first axial extension 131b is deformed into a sector shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radial inner side. Thereby, the cross-sectional shape of the portion of the flat wire constituting the first axial extension 131b, that is, the cross-sectional shape of the first coil wire portion 131a, is deformed into a trapezoidal shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radial inner side. Through the first compression process S3a, the first axial extension 131b becomes the first axial extension 31b, and the above-described first winding body 31 is produced.

[0146] In the second compression process S3b of the present embodiment, the profile shape on the cross section perpendicular to the motor axis of the second axial extension 132b is deformed into a sector shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radial inner side. Thereby, the cross-sectional shape of the portion of the flat wire constituting the second axial extension 132b, that is, the cross-sectional shape of the second coil wire portion 132a, is deformed into a trapezoidal shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radial inner side. Through the second compression process S3b, the second axial extension 132b becomes the second axial extension 32b, and the above-described second winding body 32 is produced.

[0147] As described above, in the compression process S3, the profile shape on the cross section perpendicular to the motor axis of the first axial extension 131b is deformed into a sector shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radial inner side, and the profile shape on the cross section perpendicular to the motor axis J1 of the second axial extension 132b is deformed into a sector shape in which the size in the motor circumferential direction becomes smaller as it goes toward the motor radial inner side.

[0148] In the first compression process S3a and the second compression process S3b, the method of compressively deforming each winding body is not particularly limited. In the first compression process S3a and the second compression process S3b of the present embodiment, a die that surrounds each axial extension of each winding body is used to perform press working on each axial extension to compressively deform each winding body.

[0149] The connecting step S4 is a step of arranging the second winding body 32 on the motor radial outer side of the first winding body 31 and connecting the first winding body 31 and the second winding body 32. In the connecting step S4 of the present embodiment, the one end portion 31c of the first winding body 31 is connected to the one end portion 32c of the second winding body 32. As described above, the method of connecting the one end portion 31c and the one end portion 32c is not particularly limited. Through the above steps, the coil 30 is manufactured.

[0150] According to the present embodiment, the coil 30 has the first winding body 31 and the second winding body 32 connected to the first winding body 31. When N is set to an arbitrary integer of 1 or more and M is set to an arbitrary integer larger than N, the first winding body 31 is a winding body of N layers arranged and wound in two columns arranged along the motor radial direction, and the second winding body 32 is a winding body of M layers arranged and wound in two columns arranged along the motor radial direction. In the case where the flat wire is arranged and wound in two columns, compared to the case where the flat wire is arranged and wound in three or more columns, it is easy to arrange and wind the flat wires with high precision from each other. Therefore, by connecting a plurality of winding bodies each arranged and wound in two columns, it is easy to manufacture the coil 30 in which the flat wires are arranged in four or more columns with high precision. Thereby, it is possible to suppress deformation of the shape of the coil 30.

[0151] In addition, M is an arbitrary integer larger than N. Therefore, the number of layers of the second winding body 32 located on the motor radial outer side of the first winding body 31 is larger than the number of layers of the first winding body 31. Here, in the case where the motor 1 is an internal rotor type motor, the interval between the teeth 22 adjacent to each other in the motor circumferential direction becomes larger as it goes toward the motor radial outer side. Therefore, by making the number of layers of the second winding body 32 located on the motor radial outer side of the first winding body 31 larger than the number of layers of the first winding body 31, it is possible to arrange more windings with good space efficiency between the teeth 22. Thereby, it is possible to appropriately increase the total number of turns of the coil 30.

[0152] In addition, for example, in the case where a multi-layer wound coil is manufactured by simply arranging and winding the flat wire, the total number of turns of the coil is a number obtained by multiplying the number of arrangements by the number of layers. Therefore, for example, in the case where there is a limitation in at least one of the number of arrangements and the number of layers, or the like, it is possible that a limitation is generated in the total number of turns of the coil that can be adopted. In contrast to this, according to the present embodiment, since the number of layers of the first winding body 31 and the number of layers of the second winding body 32 are different from each other, it is easy to adjust the total number of turns of the coil 30 by adjusting the number of layers of each winding body, respectively. Therefore, it is possible to improve the degree of freedom of the total number of turns of the coil 30 that can be adopted. In the present embodiment, for example, it is possible to make the total number of turns of the coil 30 an arbitrary even number of 6 or more.

[0153] Further, according to the present embodiment, the profile shape of the axial extension 30b in a cross section perpendicular to the motor axis is a sector shape in which the dimension in the motor circumferential direction becomes smaller as it goes toward the motor radial inner side. Therefore, the coils 30 can be appropriately filled and arranged between the teeth 22 adjacent in the motor circumferential direction. Thus, the coil space factor of the coils 30 can be further improved.

[0154] Further, for example, in the conventional multi-layer wound coil, in the case where the profile shape of the axial extension is made into the above-described sector shape, the smaller the dimension in the motor circumferential direction, the larger the dimension in the motor radial direction, for the cross-sectional shape of the coil wire portion located on the motor radial inner side. On the other hand, the larger the dimension in the motor circumferential direction, the smaller the dimension in the motor radial direction, for the cross-sectional shape of the coil wire portion located on the motor radial outer side. Thus, the cross-sectional shape of at least a part of the coil wire portion easily becomes a flat shape. In this case, the eddy current loss of the coil easily becomes large. Further, in the case where the flat wire having the substantially square cross-sectional shape is deformed to make the cross-sectional shape of the flat wire a flat shape, the deformation amount of the flat wire easily becomes large. Therefore, when the flat wire is deformed, the coating film of the enamel provided on the surface can be broken. Further, the deformation of each coil wire portion constituting the axial extension easily becomes non-uniform.

[0155] In contrast, according to the present embodiment, the number of layers of the second winding body 32 located on the motor radial outer side of the first winding body 31 is larger than the number of layers of the first winding body 31. Therefore, the number of layers of the second winding body 32 constituting the portion of the axial extension 30b on the motor radial outer side can be made relatively large, and the number of layers of the first winding body 31 constituting the portion of the axial extension 30b on the motor radial inner side can be made relatively small. Thus, even if the profile shape of the axial extension 30b is deformed into a sector shape, the deformation amount of each coil wire portion constituting the axial extension 30b can be reduced. Therefore, the cross-sectional shape of each coil wire portion can be suppressed from becoming flat. Thus, the eddy current loss of the coil 30 can be suppressed from becoming large. Further, the coating film of the enamel provided on the surface of the flat wire can be suppressed from being broken. Further, the deformation of each coil wire portion constituting the axial extension 30b can be suppressed from becoming non-uniform.

[0156] Further, for example, in a case where flat wires are simply arranged and wound to produce a multi-layer wound coil, depending on the number of layers and the like, it is sometimes difficult to compress deform the profile shape of the axial extension portion into a fan shape due to the large amount of deformation of the flat wires as described above and the like. Therefore, in a case where the profile shape of the axial extension portion is a fan shape, restrictions are likely to occur in the number of total turns of the coil that can be adopted. In contrast, according to the present embodiment, as described above, it is possible to compress deform the profile shape of the axial extension portion into a fan shape while suppressing the amount of deformation of each coil wire portion. Therefore, it is possible to suppress restrictions from occurring in the number of total turns of the coil 30 that can be adopted, and it is easy to adopt the number of total turns of the coil 30 desired within a range of an even number of 6 or more.

[0157] Further, according to the present embodiment, the first compression process S3a and the second compression process S3b are performed earlier than the connection process S4. Therefore, it is possible to connect the first winding body 31 and the second winding body 32 after deforming the first winding body 131 and the second winding body 132 to produce the first winding body 31 and the second winding body 32, respectively. Thereby, compared to a case where the first winding body 131 and the second winding body 132 are compressed and deformed in a concentrated manner after being joined, it is easy to compress deform each winding body.

[0158] The present application is not limited to the above-described embodiment, and other structures can be adopted within the scope of the technical idea of the present application. The kind of winding wound by the winding machine is not particularly limited. The winding can be, for example, a round wire. One of the first holding member and the second holding member can not be rotatable around the central axis of the winding core. In this case, the winding core can be rotatable around the central axis. In this case, by rotating the other holding member that is rotatable around the central axis around the central axis in the same direction as the winding core, it is possible to wind the winding in the same manner as in the above-described embodiment. The first holding member and the second holding member can be rotatable only in one direction around the central axis.

[0159] The first guide portion can be provided to the winding core. The first guide portion can not have the first guide surface. The first guide portion can not be provided. The second guide portion can be provided to the winding core. The second guide portion can not have the second guide surface. The second guide portion can not be provided.

[0160] One of the pair of rollers of the first holding member can not have the eave portion. One of the pair of rollers of the second holding member can not have the eave portion. The eave portion can not be provided. The elastic member can be any member as long as it is able to apply a force to the pair of rollers in a direction away from the winding core. One or more than three of the elastic members can be provided to each of the holding members. The elastic member can not be provided.

[0161] N is an integer of 1 or more, and is not particularly limited. M is an integer larger than N, and is not particularly limited. L is an integer larger than M, and is not particularly limited. For example, N can be 1, M can be 2, and L can be 3. That is, the first winding body can be a one-layer winding body, the second winding body can be a two-layer winding body, and the third winding body can be a three-layer winding body. In addition, M can be 2 or more larger than N, and L can be 2 or more larger than M. N, M, and L are preferably 10 or less, for example. This is to facilitate winding of the flat wire to produce each winding body, and to facilitate compression deformation of each winding body. In addition, M is preferably 3 times or less of N, for example. In this way, when the second winding body is compression-deformed, the cross-sectional shape of the coil wire portion constituting the second axial extension portion can be inhibited from becoming more flattened. The profile shape on the cross section perpendicular to the axial direction of the axial extension portion can not be a sector shape. The cross-sectional shape of the coil wire portion constituting the axial extension portion can not be a trapezoidal shape.

[0162] The process of compression-deforming the first winding body and the process of compression-deforming the second winding body can be provided after the process of connecting the first winding body and the second winding body. The processes of compression-deforming the first winding body and the second winding body can not be provided. The coil produced by the winding machine of the present application is not particularly limited. The coil produced by the winding machine of the present application can be the first winding body itself, or the second winding body itself.

[0163] The motor to which the coil produced by the winding machine of the present application is applied is not particularly limited. The motor to which the coil produced by the winding machine of the present application is applied can be an outer rotor type motor. In the above, the structures and methods described in the present specification can be appropriately combined within a range in which they do not contradict each other.

Claims

1. A winding machine comprising: a winding core around which a winding is wound; a first winding jig and a second winding jig configured to hold the winding core in an axial direction of a central axis of the winding core; and a first gripping member and a second gripping member located outside the winding core in a radial direction centered on the central axis, an outer edge portion of the first winding jig in the radial direction and an outer edge portion of the second winding jig in the radial direction are located at positions outside the winding core in the radial direction, the first gripping member and the second gripping member each have a pair of rollers capable of gripping the winding to grip the winding, at least one of the first gripping member and the second gripping member is rotatable about the central axis.

2. The winding machine according to claim 1, wherein the first gripping member and the second gripping member are rotatable about the central axis in opposite directions from each other.

3. The winding machine according to claim 2, further comprising: a first holding member that holds the first gripping member; and a second holding member that holds the second gripping member, the first holding member is annular and surrounds the first winding jig, the second holding member is annular and surrounds the second winding jig, the first holding member and the second holding member are rotatable about the central axis in opposite directions from each other.

4. The winding machine according to any one of claims 1 to 3, further comprising a first guide portion located around the winding core, the first guide portion has a first guide surface toward one side in an axial direction of the central axis, the first guide surface is located on one side in the axial direction of the central axis as it goes toward one side in a circumferential direction about the central axis.

5. The winding machine according to claim 4, further comprising a second guide portion located around the winding core, the second guide portion has a second guide surface toward the other side in the axial direction of the central axis, the second guide surface is located on one side in the axial direction of the central axis as it goes toward one side in the circumferential direction about the central axis, the first guide surface and the second guide surface are disposed facing each other with a gap in the axial direction of the central axis.

6. The winding machine according to claim 5, wherein the first guide portion and the second guide portion are connected to an outer peripheral surface of the winding core.

7. The winding machine according to claim 5 or 6, wherein the first guide portion projects from the first winding jig toward the second winding jig, the second guide portion projects from the second winding jig toward the first winding jig.

8. The winding machine according to any one of claims 1 to 3, wherein the pair of rollers each has a contact portion capable of contacting the winding in a radial direction centered on a rotational axis of the roller, at least one of the pair of rollers has a eave portion that projects from the contact portion to an outside in the radial direction centered on the rotational axis of the roller.

9. The winding machine according to claim 8, wherein the pair of rollers each has a pair of the eave portions. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The pair of eaves portions are arranged opposite each other at intervals in the axial direction of the rotation axis.

10. The winding machine according to any one of claims 1 to 3, wherein The winding machine further has an elastic member that applies a force to the pair of rollers in a direction away from the winding core.

11. A method of manufacturing a coil, the method of manufacturing a coil comprising a process of winding a winding using the winding machine according to any one of claims 1 to 10.

12. The method of manufacturing a coil according to claim 11, wherein The winding is a flat wire.

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