CN116364410A

CN116364410A - Coil forming apparatus

Info

Publication number: CN116364410A
Application number: CN202211688711.3A
Authority: CN
Inventors: 山端达也; 桥本步
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2021-12-27
Filing date: 2022-12-27
Publication date: 2023-06-30
Also published as: JP2023097178A

Abstract

The present invention provides a coil forming apparatus, which comprises: a winding core that extends in an axial direction and around which a plurality of wires are wound in a state of being aligned in the axial direction: and a wire alignment portion that is located radially outward of the winding core and has a plurality of through holes through which the plurality of wires supplied to the winding core pass, respectively. One of the winding core and the wire alignment portion rotates about an axis of the winding core with respect to the other. The plurality of through holes are aligned in a first direction, which is a direction inclined with respect to the axial direction of the winding core, when the wire alignment portion is viewed from the wire feeding direction.

Description

Coil forming apparatus

Technical Field

The present invention relates to a coil forming apparatus.

Background

A coil forming apparatus is known in which a coil is formed by winding a plurality of wires around a winding core. For example, patent document 1 discloses a coil forming apparatus including a winding jig configured to be rotatable with respect to a winding frame for winding an electric wire, and an electric wire supply device for supplying a plurality of electric wires in a parallel state to the winding frame.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication No. 2005-124313

Disclosure of Invention

Technical problem to be solved by the invention

However, in the method of forming a coil in which a plurality of wires are supplied to a winding core, the wires are wound in close contact with each other in an aligned state, whereby a coil having high dimensional accuracy can be obtained. In addition, in the coils inserted into the slots of the stator core of the motor, by winding the wires in close contact with each other in an aligned state, miniaturization of the motor and improvement of the efficiency of the motor obtained by the space factor of the coils in the slots can be achieved.

In the coil forming apparatus of patent document 1, a plurality of wires are supplied to the winding jig after passing through one slit extending in the axial direction provided in the nozzle portion. Therefore, when a coil is formed using the coil forming apparatus of patent document 1, a plurality of wires can be aligned in the axial direction. However, in the coil forming apparatus, the interval between the wires in the formed coil is determined by the interval between the plurality of wires when the slit is inserted. Therefore, in the coil forming apparatus described above, it is difficult to bring the electric wires into close contact with each other in the formed coil.

The invention aims to provide a coil forming device capable of obtaining a coil with wires in close contact with each other.

A coil forming apparatus according to an embodiment of the present invention is a coil forming apparatus for forming a coil by winding a plurality of wires. The coil forming apparatus includes: a winding core that extends in an axial direction and around which the plurality of wires are wound in a state of being aligned in the axial direction: and a wire alignment portion that is located radially outward of the winding core and has a plurality of through holes through which the plurality of wires supplied to the winding core pass, respectively. One of the winding core and the wire alignment portion rotates about an axis of the winding core with respect to the other. The plurality of through holes are aligned in a first direction, which is a direction inclined with respect to the axial direction of the winding core, when the wire alignment portion is viewed from the wire feeding direction.

Effects of the invention

According to the coil forming apparatus according to the embodiment of the present invention, a coil in which wires are in close contact with each other can be obtained.

Drawings

Fig. 1 is a diagram showing a schematic configuration of a coil forming apparatus according to embodiment 1.

Fig. 2 is a plan view of the wire rod alignment portion as seen from the wire rod feeding direction.

Fig. 3 is a sectional view taken along line III-III of fig. 2.

Fig. 4 is a cross-sectional view taken along line IV-IV of fig. 2.

Fig. 5 is a view schematically showing a state in which the wires passing through the wire alignment portion are aligned in the axial direction of the winding core.

Fig. 6 is a view for explaining a case where the wire rod alignment portion is rotated by the angle adjustment portion.

Fig. 7 is a view corresponding to fig. 2 of a wire rod alignment portion according to a modification of embodiment 1.

Fig. 8 is a view corresponding to fig. 2 of a wire rod alignment portion according to another modification of embodiment 1.

Symbol description

1-coil forming apparatus, 2-winding core, 2 a-outer peripheral surface, 3, 103, 203-wire alignment portion, 3 a-end surface, 3 b-end surface, 4-rotation mechanism, 5-angle adjustment portion, 31, 131a, 131b, 231a, 231 b-through hole row, 32 a-through holes, 33-central portion, 34, 35-opening portion, 34a, 35 a-opening end portion, C-coil, D1-interval in the first direction of adjacent through holes in the first direction, inner diameter of central portion of L1-through hole, width dimension in the first direction of opening end portion of L2-through hole, width dimension in the second direction of opening end portion of L3-through hole, M-wire, central axis of P-winding core, central axis of Q-wire alignment portion.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated. The dimensions of the constituent members in the drawings do not faithfully show the actual dimensions of the constituent members, the ratio of the dimensions of the constituent members, and the like.

In the following description of the coil forming apparatus 1, a direction parallel to the central axis P of the winding core 2 is referred to as an "axial direction". The direction perpendicular to the central axis P is referred to as a "radial direction", and the direction along an arc centered on the central axis P is referred to as a "circumferential direction".

In the following description, the "interval" between the first component and the second component refers to a distance between the center position of the first component and the center position of the second component when the component is viewed from a predetermined direction.

In the following description, "identical" and the like indicate equivalent expressions including not only a case of strict equivalence but also a case of tolerance or a case of difference in the degree of obtaining the same function.

In the following description, the term "adjacent" between the first component and the second component includes a case where the outer edge of the first component is in contact with the outer edge of the second component and a case where the first component and the second component are close to each other with a tolerance or a difference in the degree of the functions that can be obtained.

In the following description, the expressions "fixed", "connected" and "attached" include not only the case where the components are directly fixed to each other but also the case where the components are fixed via other components. That is, in the following description, the expression of fixing or the like includes the meaning of direct and indirect fixing of the components to each other.

(embodiment 1)

(integral structure)

With reference to fig. 1, a description will be given of a configuration of an exemplary coil forming apparatus 1 according to embodiment 1. The coil forming apparatus 1 is an apparatus for forming a coil C to be inserted into a slot of a stator core of a motor. The coil C is formed by winding a wire M.

The coil forming apparatus 1 according to the present embodiment winds a plurality of wires M arranged in parallel to form a coil C. As shown in fig. 1, the coil forming apparatus 1 includes a winding core 2, a wire alignment portion 3, a rotation mechanism 4, and an angle adjustment portion 5.

The winding core 2 is a member around which the wire M is wound. In the present embodiment, the winding core 2 is a columnar member extending in the axial direction. A plurality of wires M are wound around the outer peripheral surface 2a of the winding core 2.

The plurality of wires M are supplied to the winding cores 2 in a parallel arrangement. A plurality of wires M are supplied from a wire supply unit, not shown, located on the upstream side in the supply direction. The winding core 2 is driven to rotate about the central axis P by the rotation mechanism 4 in a state where a plurality of wires M are supplied. Thereby, the plurality of wires M supplied to the winding core 2 are wound around the outer peripheral surface 2a of the winding core 2 to form the coil C.

The wire alignment portion 3 is located radially outward of the winding core 2. When the wire alignment portion 3 is viewed in the feeding direction of the wire M, the wire alignment portion 3 has a plurality of through holes 32 aligned in a direction inclined with respect to the axial direction. The plurality of wires M fed from the upstream side in the feeding direction pass through the plurality of through holes 32 of the wire alignment portion 3, respectively, and are aligned in a state having a predetermined interval from each other. The plurality of wires M passing through the wire alignment portion 3 are supplied to the winding core 2.

In the present embodiment, the wire alignment portion 3 is configured to be movable in the axial direction with respect to the winding core 2. This allows the plurality of wires M passing through the plurality of through holes 32 to be wound around any range in the axial direction of the winding core 2.

In the present embodiment, the rotation mechanism 4 rotates the winding core 2 about the central axis P. The rotation mechanism 4 includes, for example, a motor (not shown) for rotating the winding core 2 about the central axis P. The winding core 2 is rotated about the central axis P by the rotation mechanism 4, whereby the plurality of wires M are wound around the outer peripheral surface 2a of the winding core 2.

The angle adjusting unit 5 changes the inclination angle of the direction in which the plurality of through holes 32 are aligned in the wire alignment unit 3 with respect to the axial direction. The angular adjustment unit 5 can adjust the axial interval between the wires supplied to the winding core 2.

(wire alignment part)

Next, a detailed structure of the wire alignment portion 3 will be described with reference to fig. 1 to 5. In fig. 2, for convenience of explanation, the portion of the through-hole 32 that penetrates therethrough is hatched.

As shown in fig. 1, the wire alignment portion 3 includes an end surface 3b facing the winding core 2, an end surface 3a located on the opposite side thereof, and a plurality of through holes 32 penetrating the wire alignment portion 3 and opening at the end surfaces 3a and 3 b. The plurality of wires M supplied to the winding core 2 are fed from the end face 3a side of the wire alignment portion 3 into the plurality of through holes 32, and are fed from the end face 3b side toward the winding core 2.

As shown in fig. 2, when the wire alignment portion 3 is viewed from the feeding direction of the wire M, the plurality of through holes 32 are aligned in a row. That is, the wire rod alignment portion 3 has a row-shaped through hole row 31 formed of a plurality of through holes 32. The direction in which the plurality of through holes 32 are arranged in the through hole row 31 is inclined with respect to the axial direction of the winding core 2 as viewed in the above-described supply direction. Hereinafter, a direction in which the through holes 32 are arranged as viewed from the supply direction is referred to as a first direction, and a direction orthogonal to the first direction as viewed from the supply direction is referred to as a second direction.

In the present embodiment, the plurality of through holes 32 are arranged at equal intervals in the first direction. That is, the interval between the through holes 32 adjacent in the first direction is D1. In the present embodiment, the plurality of through holes 32 are in the same direction as the penetrating direction of the wire alignment portion 3. Therefore, the interval D1 between adjacent through holes 32 out of the plurality of through holes 32 opened to the end face 3a of the wire alignment portion 3 is the same as the interval D1 between adjacent through holes 32 out of the plurality of through holes 32 opened to the end face 3b of the wire alignment portion 3.

As shown in fig. 3 and 4, the through hole 32 has a central portion 33 extending in the through direction, an opening 34 that opens at the end face 3a of the wire alignment portion 3, and an opening 35 that opens at the end face 3b of the wire alignment portion 3. The opening 34 has an opening end 34a located at the end face 3a of the wire alignment portion 3. The opening 35 has an opening end 35a located at the end face 3b of the wire alignment portion 3.

The inner diameters of the

openings

34 and 35 become larger from the central portion 33 toward the opening end portions 34a and 34 b. Specifically, the inner surfaces of the

openings

34 and 35 are formed of curved surfaces curved in the direction in which the inner diameter of the through-hole 32 increases. That is, the boundary portion between the central portion 33 and the

openings

34 and 35, the boundary portion between the opening 34 and the end face 3a, and the boundary portion between the opening 35 and the end face 3b in the inner surface of the through hole 32 are formed of curved surfaces. This can prevent the wire M passing through the through hole 32 from coming into contact with the boundary between the through hole and the end surfaces 3a and 3b, thereby damaging the surface of the wire M.

The plurality of through holes 32 have the same cross-sectional shape except for through holes 32a located at both ends of the through hole row 31. Specifically, when the central portion 33 is viewed from the penetrating direction of the through hole 32, the cross-sectional shape of the central portion 33 of the through

holes

32, 32a is circular. The central portion 33 has an inner diameter L1.

As shown in fig. 2, the opening portion 34 of the through hole 32 has an outer edge shape of an opening end portion 34a, and a width L2 in the first direction is smaller than a width L3 in the second direction when viewed in the through direction. Specifically, the opening end portions 34a of the through holes 32 adjacent in the first direction overlap in the first direction, whereby the width L2 of the opening end portions 34a in the first direction is smaller than the width L3 in the second direction. The outer edge shape of the opening end portion may be, for example, an oval shape having a width L2 in the first direction smaller than a width L3 in the second direction when viewed in the penetrating direction.

The interval D1 in the first direction in the through holes 32 adjacent in the first direction is the same as the width L2 in the first direction in the opening end portion 34a of the through hole 32 adjacent in the first direction. In this way, since the opening end portions 34a of the through holes 32 adjacent in the first direction overlap in the first direction, the interval D1 in the first direction of the through holes 32 adjacent in the first direction can be reduced.

The through holes 32a located on both sides of the through hole row 31 have through holes adjacent to one side only in the first direction. Thus, the width of the opening end portion 34a of the through hole 32a in the first direction is larger than the width L2 of the opening end portion 34a of the through hole 32 in the first direction.

The shape of the opening 35 is the same as that of the opening 34, and therefore, description thereof will be omitted.

As described above, the plurality of through holes 32 are in the same direction as the penetrating direction of the wire alignment portion 3. Therefore, the plurality of wires M passing through the plurality of through holes 32 of the wire alignment portion 3 are sent from the wire alignment portion 3 to the winding core 2 with the intervals D1 therebetween in the first direction. Therefore, in the coil forming apparatus 1 of the present embodiment, the plurality of wires M can be supplied to the winding core 2 in a state of being aligned in parallel in the first direction. The plurality of wires M supplied in a state of being aligned in the first direction are aligned in the axial direction when wound around the outer peripheral surface 2a of the winding core 2.

Fig. 5 is a diagram schematically showing a case where a plurality of wires M aligned in the first direction are wound around the outer peripheral surface 2a of the winding core 2 extending in the axial direction. As shown in fig. 5, a plurality of wires M arranged at intervals D1 in the first direction are arranged in the axial direction when wound around the winding core 2. Thereby, the interval in the axial direction of the winding cores 2 of the wires M becomes narrow. That is, the plurality of wires M supplied to the winding core 2 are passed through the plurality of through holes 32 of the wire alignment portion 3, and the coil C having the narrow interval between the wires M can be formed.

In the present embodiment, as shown in fig. 2, the interval D1 between adjacent ones of the plurality of through holes 32 in the first direction is smaller than the width L3 of the opening end 34a of the opening 34 of the plurality of through holes 32 in the second direction. That is, the through holes 32 adjacent in the first direction can be made closer. This makes it possible to further narrow the intervals between the plurality of wires M when wound around the winding core 2.

In the present embodiment, the wire alignment portion 3 is rotatable about the central axis Q. The center axis Q is an axis extending in a direction intersecting the axial direction of the winding core 2. The wire alignment portion 3 is rotated around the central axis Q by the angle adjustment portion 5. Thereby, the angle of the first direction in which the through-hole rows 31 are arranged with respect to the axial direction of the winding core 2 can be changed.

(Angle adjusting part)

Next, the angle adjusting unit 5 will be described with reference to fig. 6. In fig. 6, a plurality of through holes 32 are schematically shown as one through hole row 31 for convenience of explanation. The angle adjusting unit 5 rotates the wire alignment unit 3 around the center axis Q. That is, the coil forming apparatus 1 includes the angle adjusting portion 5 that rotates the wire alignment portion 3 around an axis extending in a direction intersecting the axial direction of the winding core 2. By rotating the wire alignment portion 3 around the central axis Q, the inclination angle of the direction in which the plurality of through holes 32 are aligned with respect to the axial direction can be changed. This makes it possible to adjust the axial interval of the winding cores 2 of the plurality of wires M when wound around the winding cores 2.

For example, when the through-hole row 31 is located at the position of the solid line in fig. 6, the length of the through-hole row 31 in the axial direction is W1. Accordingly, the same number of wires M as the number of through holes 32 included in the through hole row 31 are wound within the range of the axial length W1 of the winding core 2. On the other hand, when the through-hole row 31 is located at the position shown by the broken line in fig. 6, the length of the through-hole row 31 in the axial direction is W2. Accordingly, the same number of wires M as the number of through holes 32 included in the through hole row 31 are wound within the range of the axial length W2 of the winding core 2. That is, the angle adjusting unit 5 can change the axial interval between the wires M wound around the winding core 2 by rotating the wire alignment unit 3.

In the coil forming apparatus 1 having the above-described configuration, the plurality of wires M supplied from the upstream side in the supply direction pass through the plurality of through holes 32 of the wire alignment portion 3, and then are supplied to the winding cores 2 rotated about the axis by the rotation mechanism 4. The wire alignment unit 3 aligns the plurality of wires M in a first direction, which is a direction inclined with respect to the axial direction of the winding core 2, while having a distance D1 therebetween. The plurality of wires M are arranged in the axial direction of the winding core 2 when wound around the winding core 2.

In the present embodiment, the rotation mechanism 4 rotates the winding core 2 about the axis. However, the rotation mechanism may rotate the wire alignment portion with respect to the winding core. That is, the wire alignment portion may be rotated with respect to the winding core on the outer side in the radial direction of the winding core.

As described above, the coil forming apparatus 1 according to the present embodiment is the coil forming apparatus 1 that winds the supplied plurality of wires M to form the coil C. The coil forming apparatus 1 includes: a winding core 2 that extends in an axial direction and is wound with a plurality of wires M in a state of being aligned in the axial direction; and a wire alignment portion 3 that is located radially outward of the winding core 2 and has a plurality of through holes 32 through which the plurality of wires (M) supplied to the winding core 2 pass, respectively. One of the winding core 2 and the wire alignment portion 3 rotates around the axis of the winding core 2 with respect to the other. When the wire alignment portion 3 is viewed in the feeding direction of the wire M, the plurality of through holes 32 are aligned in a first direction which is a direction inclined with respect to the axial direction of the winding core 2.

When the wire alignment portion 3 is viewed in the feeding direction of the wires M, the plurality of through holes 32 through which the plurality of wires M fed to the winding core 2 in the wire alignment portion 3 pass are aligned in a direction inclined with respect to the axial direction of the winding core 2. Therefore, the interval in the axial direction of the plurality of through holes 32 is smaller than that in the case where the plurality of through holes are aligned in the axial direction.

In the coil forming apparatus 1, the plurality of wires M are supplied to the winding core 2 in an axially aligned state after passing through the plurality of through holes 32 aligned in the first direction of the wire alignment portion 3. That is, the wire alignment portion 3 makes the interval between the wires M when wound around the winding core 2 in the axial direction narrower than the interval between the wires M before passing through the plurality of through holes 32. This can form the coil C with the plurality of wires M spaced at a narrow interval.

In the coil forming apparatus 1 of the present embodiment, the plurality of through holes 32 have the opening

portions

34, 35 whose inner diameters become larger toward the opening

end portions

34a, 35a.

The wire M passing through the through-hole 32 is pulled in a direction different from the penetrating direction of the through-hole 32 by being wound around the winding core 2, and contacts the opening ends 34a, 35a of the

openings

34, 35. In the above configuration, the inner diameters of the

openings

34 and 35 of the through-hole 32 become larger toward the opening

end portions

34a and 35a. Therefore, damage to the surface of the wire M by the open ends 34a, 35a can be suppressed. Accordingly, the coil forming apparatus 1 capable of forming the coil C having less damage and a narrow interval between the wires M can be provided.

(modification of the wire alignment portion)

The wire alignment portion 3 has one through-hole row 31. However, as shown in fig. 7 and 8, the

wire alignment portion

103, 203 may have a plurality of through-hole rows aligned in the second direction.

In the example shown in fig. 7, the wire alignment portion 103 has two through-

hole rows

131a and 131b aligned in the second direction. When the wire alignment portion 103 is viewed in the feeding direction, the plurality of through holes 32 included in each of the two through

hole rows

131a and 131b are aligned in the first direction.

That is, the wire alignment portion 103 has a plurality of through-hole rows 131 including a plurality of through-holes 32 aligned in the first direction. The plurality of through-hole rows 131 are arranged in a second direction orthogonal to the first direction and the penetrating direction of the through-holes 32.

Thus, the wire alignment portion 103 has more through holes 32 than the wire alignment portion 3 having one through hole row 31. Therefore, in the wire alignment portion 103, more wires M can be supplied to the winding core 2 than the wires M supplied by the wire alignment portion 3 within a predetermined axial range of the winding core 2. Therefore, in the coil forming apparatus having the wire alignment portion 103, the coil C in which the wires M are in closer contact can be formed.

In the example shown in fig. 8, the wire alignment portion 203 has two through-hole rows 231 aligned in the second direction. When the wire alignment portion 203 is viewed in the feeding direction, the plurality of through holes 32 included in each of the two through hole rows 231 are aligned in the first direction.

The structure of each through-hole row 231 is the same as that of the through-hole row 31 of embodiment 1. That is, the plurality of through holes 32 included in each through hole row are arranged at equal intervals in the first direction. The interval between adjacent through holes 32 included in each through hole row is D1. The opening end portions 34a of the through holes 32 adjacent in the first direction overlap in the first direction, whereby the width L2 of the opening end portions 34a in the first direction is smaller than the width L3 in the second direction.

In the wire alignment portion 203, the positions of the through holes 32 aligned in the first direction included in one through hole row 231a and the positions of the through holes 32 aligned in the first direction included in the other through hole row 231b are different in the first direction among the through hole rows 231 adjacent in the second direction. The opening end 34a of the through hole 32 included in one through hole row 231a is adjacent to the opening end 35a of the through hole 32 included in the other through hole row 231 b. That is, the opening end portions 34a of the through holes 32 included in one through hole row 231a arranged in the second direction are adjacent to the opening end portions 35a of the through holes 32 included in the other through hole row 231b at positions offset in the first direction. In this way, in the wire alignment portion 203, the adjacent through-hole rows 231 can be positioned close to each other in the second direction. Therefore, the wire alignment portion 203 can have a larger number of through holes 32 within a predetermined range, and thus can be configured to be able to supply a larger number of wires M to the winding core 2.

That is, in the wire rod alignment portion 203 of the present modification, the plurality of through holes 32 have the opening

portions

34, 35 whose inner diameters become larger toward the opening

end portions

34a, 35a. In the through-hole rows 231 adjacent in the second direction, the opening ends 34a, 35a of the through-holes 32 included in one through-hole row 231a are adjacent to the opening ends 34a, 35a of the through-holes 32 included in the other through-hole row 231b when viewed in the through-hole direction of the through-holes 32. The opening ends 34a, 35a of the adjacent through holes 32 included in each through hole row overlap in the first direction.

Thus, the through holes 32 adjacent to each other in the first direction can be located at a relatively close position. Therefore, the distance between the wires M wound around the winding core 2 can be made narrower. In addition, the through-hole rows 231 aligned in the second direction can be located at a relatively close position. Therefore, more wires M can be supplied to the winding core 2. The inner diameter of the through hole 32 increases toward the opening ends 34a and 35a. Therefore, the wire M can be prevented from being damaged by the angular contact with the

openings

34 and 35. Accordingly, in the coil forming apparatus having the wire alignment portion 203, it is possible to provide the coil forming apparatus capable of forming the coil C in which the wires M are in closer contact with each other with less damage.

(other embodiments)

The embodiments of the present invention have been described above, but the above embodiments are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above-described embodiments, and the above-described embodiments may be appropriately modified and implemented within a range not departing from the gist thereof.

In each of the above embodiments, the winding core 2 has a cylindrical shape. However, the winding core may be a member capable of winding the wire M in the circumferential direction, and may have a shape other than a cylindrical shape. For example, the winding core may have a prismatic shape or an elliptical shape when viewed from the axial direction.

In each of the above embodiments, the outer peripheral surface 2a of the winding core 2 extends in the axial direction. However, the outer peripheral surface of the winding core may be tapered extending in a direction inclined with respect to the axial direction as long as a plurality of wires M can be wound.

In each of the above embodiments, the winding core 2 is one columnar member in which the wire M is wound around the outer peripheral surface 2 a. However, the winding core may be constituted by a plurality of columnar members arranged rotationally symmetrically about the central axis P. In this case, the coil C can be formed by erecting and winding the wire M around the plurality of columnar members. In this case, the columnar member may extend in the axial direction, or may extend in a direction inclined with respect to the central axis P as long as the plurality of wires M can be wound.

In each of the above embodiments, the coil forming apparatus 1 has the angle adjusting section 5. However, the coil forming apparatus may not have the angle adjusting portion. In this case, the direction in which the plurality of through holes of the wire alignment portion are aligned may be fixed.

In each of the above embodiments, the

wire alignment portion

3, 103, 203 is configured to be movable in the axial direction with respect to the winding core 2. However, the wire alignment portion may be configured not to move in the axial direction. The winding core may be configured to be movable in the axial direction with respect to the wire alignment portion.

In each of the above embodiments, the

wire alignment portion

3, 103, 203 has the plurality of through holes 32 arranged at equal intervals in the first direction. However, the wire rod alignment portion may have a plurality of through holes aligned in the first direction, and the plurality of through holes may be aligned at unequal intervals. The plurality of through holes may be arranged at predetermined intervals.

In each of the above embodiments, the plurality of through holes 32 are in the same direction as the penetrating direction of the wire

rod alignment portion

3, 103, 203. However, the directions of penetration of the plurality of through holes may be different from each other. The direction of penetration of the plurality of through holes may be a direction according to a predetermined rule.

In each of the above embodiments, the

openings

34 and 35 of the through-hole 32 have a shape in which the inner diameter increases toward the opening ends 34a and 35a. However, the opening may be formed so that the inner diameter of the entire opening is larger than the inner diameter of the central portion. In this case, the wire alignment portion may have a deforming member that deforms in a direction to be pressed when pressed by the wire M at a boundary portion between the central portion and the opening portion and a boundary portion between the opening portion and the end surface of the wire alignment portion in the inner surface of the through hole. This can suppress surface damage of the wire M when the wire M passing through the through-hole is pulled in a direction different from the penetrating direction of the through-hole 32.

In each of the above embodiments, the width L2 of the opening ends 34a, 35a of the through hole 32 in the first direction is smaller than the width L3 in the second direction. However, the opening end portion of the through hole may have the same width in the second direction as the first direction. The opening end portion of the through hole may have a width in the first direction larger than a width in the second direction.

In each of the modifications of embodiment 1, the

wire alignment portions

103 and 203 have two through-

hole rows

131 and 231. However, the wire alignment portion may have three or more through-hole rows.

In each modification of embodiment 1, the number of through holes included in the through

hole rows

131a and 231a is the same as the number of through holes included in the through

hole rows

131b and 231 b. However, the plurality of through-hole columns may have different numbers of through-holes.

Industrial applicability

The present invention can be used in a coil forming apparatus for forming a coil.

Claims

1. A coil forming apparatus for forming a coil by winding a plurality of wires, the coil forming apparatus comprising:

a winding core that extends in an axial direction and that winds the plurality of wires in a state of being aligned in the axial direction: and

A wire alignment part which is positioned radially outside the winding core and has a plurality of through holes through which the plurality of wires supplied to the winding core pass,

one of the winding core and the wire alignment portion rotates around the axis of the winding core relative to the other,

the plurality of through holes are aligned in a first direction, which is a direction inclined with respect to the axial direction of the winding core, when the wire alignment portion is viewed from the wire feeding direction.

2. The coil forming apparatus according to claim 1, wherein,

the plurality of through holes are in the same direction as the penetrating direction of the wire rod alignment portion.

3. The coil forming apparatus according to claim 1 or 2, wherein,

the plurality of through holes have openings with inner diameters that increase toward the open end.

4. A coil forming apparatus according to any one of claims 1 to 3, wherein,

the coil forming device includes an angle adjusting unit that rotates the wire alignment unit about an axis extending in a direction intersecting the axial direction of the winding core.

5. The coil forming apparatus as claimed in claim 3, wherein,

when a direction orthogonal to the first direction and the penetrating direction of the through hole is set to a second direction, a distance between adjacent through holes in the first direction is smaller than a width of the opening end portion of the opening portion of the through holes in the second direction.

6. The coil forming apparatus according to any one of claims 1 to 5, wherein,

the wire rod alignment portion has a plurality of through-hole rows including the plurality of through-holes aligned in the first direction,

the plurality of through-hole columns are arranged in a second direction orthogonal to the first direction and the through-hole direction of the through-holes.

7. The coil forming apparatus as claimed in claim 6, wherein,

among the through-hole rows adjacent to each other in the second direction, the positions of the through-holes arranged in the first direction included in one through-hole row are different from the positions of the through-holes arranged in the first direction included in the other through-hole row.

8. The coil forming apparatus according to claim 6 or 7, wherein,

the plurality of through holes have opening portions whose inner diameters become larger toward the opening end portions,

in the second direction adjacent through-hole rows, the opening ends of the through-holes included in one through-hole row are adjacent to the opening ends of the through-holes included in the other through-hole row when viewed in the through-direction, and the opening ends of the adjacent through-holes included in each through-hole row overlap in the first direction.