Rotary electric machine

Abstract

To provide a cylindrical coil arranged in a concentric circular shape with respect to a rotation axis of a rotary electric machine and made by winding a wire, the cylindrical coil being manufactured easily and being capable of inhibiting generation of cyclic current.SOLUTION: A cylindrical coil comprises a plurality of phases and arranged in a concentric circular shape with respect to an axial direction in which a rotation axis of a rotary electric machine extends and so as to surround the axial direction in a circumferential direction, which is a hoop direction with respect to the axial direction. The cylindrical coil is configured by a plurality of phase coils, each of which configures one of the plurality of phases and has a phase coil input end and a phase coil output end, being arranged so that with respect tp one phase coil, other phase coils are shifted in the circumferential direction, respectively. Each of the phase coils is configured by bundling a plurality of electrically conductive wires, each of which has a wire input end and a wire output end and extends from the wire input end positioned at the phase coil input end to the wire output end positioned at the phase coil output end. Each of the phase coils extends in the circumferential direction while repeating curvatures lifted or lowered in the axial direction in a wavy manner.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a hollow cylindrical coil for use in a motor or generator. [Background technology]

[0002] 2. Description of the Related Art Various proposals have been made so far regarding hollow cylindrical coils used in motors, generators and the like.

[0003] For example, Patent Document 1 proposes a coil body formed by concentrically stacking two thin metal plates, each of which is a cylindrical body on which a conductive band is patterned by etching a conductive plate-like body (e.g., a copper plate), as an inner cylinder and an outer cylinder. Each cylinder has a conductive band of a complementary pattern that forms an electric circuit when the ends of the cylinders are connected to each other. A layer of non-conductive fiber strands is formed between each cylinder, and this layer insulates the conductive band of the inner cylinder from the conductive band of the outer cylinder. The coil body is encapsulated with a material, specifically, polyimide, that fills the conductive bands and the non-conductive fiber strands.

[0004] Patent Document 2 proposes a coil body formed by folding a conductive sheet having a plurality of conductive bands and shaping the folded conductive sheet into a cylindrical shape.

[0005] In Patent Documents 3 and 4 by the applicant of the present application, a cylindrical coil is proposed, which is made of a wound wire and is arranged concentrically with respect to the rotating shaft of a rotating electric machine. In this coil, a flat coil body is formed by winding a wire in a spiral shape several times around a winding axis extending in a radial direction perpendicular to the rotating shaft, and a plurality of such flat coil bodies are arranged continuously in the circumferential direction of the cylindrical coil body to surround the rotating shaft of the rotating electric machine. The wire is, for example, a conductive wire whose outer periphery is covered with an enamel layer or the like, which is bundled together and then covered with a fibrous material such as glass fiber.

[0006] Also, although it is not a hollow cylindrical coil, Patent Document 5 proposes a coil that is wound around a core having a plurality of slots distributed in the circumferential direction of a cylindrical core reference surface and has a plurality of star connections, suppressing the generation of circumferential currents while suppressing increases in time and equipment costs for the coil winding process. Patent Document 6 proposes a motor winding structure that is said to reduce eddy currents and circulating currents generated in the windings of a stator core. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 3704044 [Patent Document 2] JP 2017-70140 A [Patent Document 3] Patent No. 6948748 [Patent Document 4] International Publication WO2021 / 152662A1 [Patent Document 5] Patent No. 5858145 [Patent Document 6] JP 2008-136300 A Summary of the Invention [Problem to be solved by the invention]

[0008] The objective of the present invention is to propose a cylindrical coil made of wound wire and arranged concentrically about the rotating shaft of a rotating electric machine, which is easy to manufacture and can suppress the generation of circulating current. [Means for solving the problem]

[0009] The coil is a cylindrical coil having a plurality of phases that are arranged concentrically with respect to the axial direction along which the rotating shaft of the rotating electric machine extends, and that surrounds the axial direction in a circumferential direction that is circumferential to the axial direction.

[0010] The cylindrical coil is formed by a plurality of phase coils each of which constitutes one of the plurality of phases and each having a phase coil input end and a phase coil output end, and by arranging one of the phase coils so that the other phase coils are each shifted in the circumferential direction relative to one of the phase coils.

[0011] Each wire has a wire input end and a wire output end, and each phase coil is formed by bundling together multiple conductive wires extending from the wire input end located at the phase coil input end to the wire output end located at the phase coil output end.

[0012] The problem was solved by configuring each of the phase coils to extend in the circumferential direction while repeating a wavy up-and-down curve in the axial direction.

[0013] In the above, a forward-side axial portion of one of the phase coils extending in the axial direction in a forward direction from the phase coil input end to the phase coil output end of the one of the phase coils; an opposite axial portion of the one of the phase coils extending in the axial direction in an opposite direction from the phase coil output end toward the phase coil input end of the one of the phase coils; The phase coils may extend in the circumferential direction so as to overlap and cross each other in a radial direction perpendicular to the axial direction.

[0014] This means: the phase coil input terminal and the phase coil output terminal of each of the plurality of phase coils are located close to each other, At the intersections between the forward axial portion and the reverse axial portion, the positions of the forward axial portion and the reverse axial portion are interchanged inward and outward in the radial direction at each intersection position adjacent to each other in the circumferential direction. It can be configured.

[0015] In the above, The overlapping intersection between the forward axial portion and the reverse axial portion is performed only between the forward axial portion and the reverse axial portion of each of the phase coils, The intersection between the forward axial portion and the reverse axial portion in one of the other phase coils may be configured to occur between the intersection positions between the forward axial portion and the reverse axial portion in one of the phase coils that are adjacent to each other in the circumferential direction.

[0016] For example, three or more coils are used to correspond to multiple phases such as U phase, V phase, and W phase, and each of the multiple coils is made by bundling multiple long conductors into one after insulating them, and winding or meandering the wire material bundled into one in the same pattern from the input end to the output end to form a strip-shaped coil material. This type of strip-shaped coil material is prepared for the number of phases used (for example, three phases, U phase, V phase, and W phase), and the problem is solved by forming the strip-shaped coil material for each phase into a ring so that the input end and output end of the strip-shaped coil material are close to each other in the circumferential direction. Effect of the Invention

[0017] According to the present invention, it is possible to provide a cylindrical coil made of wound wire and arranged concentrically about the rotating shaft of a rotating electric machine, which is easy to manufacture and can suppress the generation of circulating current. [Brief description of the drawings]

[0018] [Figure 1] 1 is a perspective view showing an embodiment in which the cylindrical coil according to the present invention is a cylindrical coil of multiple phases, ie, U-phase, V-phase, and W-phase. [Diagram 2] 2 is a plan view of the cylindrical coil shown in FIG. 1 as viewed from the axial direction along which the rotation shaft of the rotating electric machine extends. [Diagram 3] (a) is a side view of FIG. 1, and (b) is a cross-sectional view taken along line AA of FIG. 2 with some parts omitted. [Figure 4]2 is a plan view showing an example of a flat coil that is bent into a cylindrical shape to form the cylindrical coil shown in FIG. 1. [Diagram 5] 5A is an enlarged view of the left side of the flat coil shown in FIG. 4, and FIG. 5B is an enlarged view of the right side of the flat coil shown in FIG. [Figure 6] 2 is an enlarged perspective view showing an example of a portion of each of the phase coil input ends and phase coil output ends of each of the phase coils arranged close to each other in the cylindrical coil shown in FIG. 1; FIG. [Figure 7] 7 is an enlarged perspective view showing the state of a wire input end and a wire output end of a plurality of wires bundled together at a phase coil input end and a phase coil output end in FIG. 6, respectively. [Figure 8] 5 is a perspective view, with some parts omitted, showing an example of an arrangement of coils for each phase at the right end portion of FIG. 4 in the flat coil shown in FIG. 4. [Figure 9] 9 is a partially omitted perspective view showing an example in which each phase coil extends in a left-right direction perpendicular to the up-down direction in FIG. 4 while repeating a wavy curve in the up-down direction from the state shown in FIG. 8. [Figure 10] 10 is a partially omitted perspective view showing an example in which each phase coil extends in a left-right direction perpendicular to the up-down direction in FIG. 4 while repeating a wavy curve in the up-down direction from the state shown in FIG. 9. [Figure 11] 5 is an enlarged perspective view of the left end portion of the planar coil shown in FIG. 4 with some parts omitted. [Figure 12] 1 is formed from the flat coil shown in FIG. 4, the vertical direction of the flat coil shown in FIG. 4 corresponds to the direction in which the rotation axis extends when the cylindrical coil shown in FIG. 1 is formed, and an example of the arrangement of each phase coil at the left end portion of FIG. 4 is shown with some parts omitted. [Figure 13] 2 is a perspective view showing a state in which a cylindrical yoke having magnets arranged on its inner circumferential surface is arranged radially outside the cylindrical coil shown in FIG. 1. [Figure 14] FIG. 14 is a side view of the state shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] A cylindrical coil 1 of this embodiment will be described with reference to FIGS.

[0020] Fig. 1 is a perspective view showing a cylindrical coil 1 according to an embodiment of the present invention. The cylindrical coil 1 shown in Fig. 1 is arranged concentrically with respect to an axial direction in which a rotation axis of a rotating electric machine indicated by a virtual line 100 in Fig. 1 extends, and is arranged to surround the axial direction 100 in a circumferential direction that is circumferential to the axial direction 100. The cylindrical coil 1 has a plurality of phases. In this embodiment, a cylindrical coil 1 having three phases, a U phase, a V phase, and a W phase, will be described.

[0021] The cylindrical coil 1 constitutes each of a plurality of phases, and is made up of a plurality of phase coils, each of which has a phase coil input end and a phase coil output end.

[0022] The cylindrical coil 1 for three phases, U, V, and W, according to the embodiment is composed of a U-phase coil 2, a V-phase coil 3, and a W-phase coil 4. The U-phase coil 2 has a U-phase coil input terminal U 21 , the other end is U-phase coil output terminal U 22 The V-phase coil 3 is a phase coil having a V-phase coil input terminal V 31 , and the other end is the V-phase coil output terminal V 32 The W-phase coil 4 is a phase coil having a W-phase coil input terminal W 41 , the other end is W-phase coil output terminal W 42 A phase coil having the following structure:

[0023] A cylindrical coil 1 is formed by arranging multiple phase coils like this such that one phase coil is offset from the other phase coils in the circumferential direction relative to the axial direction 100, as shown in FIG. 1.

[0024] In the embodiment, a three-phase cylindrical coil 1 having U, V, and W phases is arranged such that the V-phase coil 3 is circumferentially shifted from the U-phase coil 2, and the W-phase coil 4 is circumferentially shifted from the V-phase coil 3, as shown in FIG.

[0025] Fig. 4 shows the flat coil 11 in a flat state before the cylindrical coil 1 shown in Fig. 1 is formed. The cylindrical coil 1 shown in Fig. 1 is formed by bending the flat coil 11 shown in Fig. 4 into a cylindrical shape so that the right end and the left end in Fig. 4 are close to each other in the circumferential direction that is the circumferential direction with respect to the axial direction 100 in Fig. 1. When the flat coil 11 shown in Fig. 4 is bent into a cylindrical shape to form the cylindrical coil 1 shown in Fig. 1, the U-phase coil input end U 21 , V-phase coil input terminal V 31 , W-phase coil input terminal W 41 , W-phase coil output terminal W 42 The left side of the flat coil 11 where the wire is present and the right side of the flat coil 11 in Fig. 4 are positioned close to each other in the circumferential direction as shown in Fig. 1. In this way, the cylindrical coil 1 shown in Fig. 1 is formed by bending the flat coil 11 in the state shown in Fig. 4 into a cylindrical shape.

[0026] 1, the V-phase coil 3 is circumferentially offset from the U-phase coil 2, and the W-phase coil 4 is circumferentially offset from the V-phase coil 3. Thus, even in the state of flat coil 11 before being curved into a cylindrical shape, the V-phase coil 3 is circumferentially offset to the right in Fig. 4 from the U-phase coil 2, and the W-phase coil 4 is circumferentially offset from the V-phase coil 3.

[0027] Each phase coil has a wire input end and a wire output end, and is constructed by bundling together several long conductive wires extending from the wire input end located at the phase coil input end to the wire output end located at the phase coil output end.

[0028] In the illustrated embodiment, each of the U-phase coil 2, V-phase coil 3, and W-phase coil 4 is formed by bundling six long conductive wires and has the same configuration and structure.

[0029] Therefore, in the following, only the U-phase coil 2 will be described, and descriptions of the V-phase coil 3 and the W-phase coil 4 will be omitted.

[0030] The U-phase coil 2 is made of six long conductive wires U 5-1 , U 5-2 , U 5-3 , U 5-4 , U 5-5 , U 5-6 These are bundled together (Figures 6 and 7).

[0031] Wire U 5-1 is the wire input end U 5-1-1 and wire output end U 5-1-2 and equipped with a wire input terminal U 5-1-1 From wire output end U 5-1-2 The wire U 5-2 is the wire input end U 5-2-1 and wire output end U 5-2-2 and equipped with a wire input terminal U 5-2-1 From wire output end U 5-2-2 The wire U 5-3 is the wire input end U 5-3-1 and wire output end U 5-3-2 and equipped with a wire input terminal U 5-3-1 From wire output end U 5-3-2 The wire U 5-4 is the wire input end U 5-4-1 and wire output end U 5-4-2 and equipped with a wire input terminal U 5-4-1 From wire output end U 5-4-2 The wire U 5-5 is the wire material input end U 5-5-1 and wire output end U 5-5-2 and equipped with a wire input terminal U 5-5-1 From wire output end U 5-5-2 The wire U 5-6 is the wire input end U 5-6-1 and wire output end U 5-6-2 and equipped with a wire input terminal U 5-6-1 From wire output end U 5-6-2 It extends to.

[0032] As shown in Figures 6 and 7, wire U 5-1 , U 5-2 , U 5-3 , U 5-4 , U5-5 , U 5-6 Wire input end U 5-1-1 , Wire input end U 5-2-1 , Wire input end U 5-3-1 , Wire input end U 5-4-1 , Wire input end U 5-5-1 , Wire input end U 5-6-1 are the U-phase coil input terminals, which are the phase coil input terminals. 21 It is located in.

[0033] In addition, wire U 5-1 , U 5-2 , U 5-3 , U 5-4 , U 5-5 , U 5-6 Wire output end U 5-1-2 , wire output end U 5-2-2 , wire output end U 5-3-2 , wire output end U 5-4-2 , wire output end U 5-5-2 , wire output end U 5-6-2 In both cases, the U-phase coil output terminal U 22 It is located in.

[0034] In this way, each wire is connected to the input terminal U 5-1-1 , Wire input end U 5-2-1 , Wire input end U 5-3-1 , Wire input end U 5-4-1 , Wire input end U 5-5-1 , Wire input end U 5-6-1 and the wire output end U 5-1-2 , wire output end U 5-2-2 , wire output end U 5-3-2 , wire output end U 5-4-2 , wire output end U 5-5-2 , wire output end U 5-6-2 and a U-phase coil input terminal U 21 The wire input end U 5-1-1 , Wire input end U 5-2-1 , Wire input end U 5-3-1 , Wire input end U 5-4-1 , Wire input end U 5-5-1 , Wire input end U 5-6-1 From the phase coil output terminal, U phase coil output terminal U 22 The wire output end U5-1-2 , wire output end U 5-2-2 , wire output end U 5-3-2 , wire output end U 5-4-2 , wire output end U 5-5-2 , wire output end U 5-6-2 Six long conductive wires extending to 5-1 , U 5-2 , U 5-3 , U 5-4 , U 5-5 , U 5-6 are bundled together to form a U-phase coil 2 serving as a phase coil.

[0035] Long conductive wire U 5-1 , U 5-2 , U 5-3 , U 5-4 , U 5-5 , U 5-6 The wires U are, for example, ultra-fine wires made of copper, each of which is covered with an enamel layer or the like. The wire diameter is selected, for example, from the range of 0.05 to 0.2 mm. 5-1 , U 5-2 , U 5-3 , U 5-4 , U 5-5 , U 5-6 The entirety of the is covered with a fibrous material such as glass fiber.

[0036] Since a plurality of long conductive wires are bundled together in this manner, each phase coil is also long. 21 to the other end of the U-phase coil output terminal U 22 The V-phase coil 3 is a long phase coil extending from the V-phase coil input terminal V 31 to the other end of the V-phase coil output terminal V 32 The long phase coil, W-phase coil 4, extends from the W-phase coil input terminal W 41 to the other end of the W-phase coil output terminal W 42 It is a long phase coil that extends to the

[0037] As shown in Fig. 1, the long U-phase coil 2, the long V-phase coil 3, and the long W-phase coil 4 each extend in the circumferential direction while repeatedly curving up and down in a wavy manner in the axial direction 100. In flat coil 11 in a flat state before being curved into a cylindrical shape as shown in Fig. 1, the long U-phase coil 2, the long V-phase coil 3, and the long W-phase coil 4 each extend in the left-right direction in Fig. 4, which corresponds to the circumferential direction when curved into a cylindrical shape, while repeatedly curving up and down in a wavy manner in Fig. 4.

[0038] As shown in FIG. 1, in the cylindrical coil 1 of this embodiment in which the V-phase coil 3 is arranged circumferentially offset with respect to the U-phase coil 2, and the W-phase coil 4 is arranged circumferentially offset with respect to the V-phase coil 3, the long U-phase coil 2, the long V-phase coil 3, and the long W-phase coil 4 each extend in the circumferential direction while repeating wavy up and down curves in the axial direction 100 as shown in FIG. 1, in the configuration shown in FIG. 1, FIG. 6, and FIG. 7.

[0039] That is, in each of the U-phase coil 2, the V-phase coil 3, and the W-phase coil 4, 21 and U-phase coil output terminal U 22 and are located close to each other in the circumferential direction, and the V-phase coil input terminal V 31 and V-phase coil output terminal V 32 and are located close to each other in the circumferential direction, and the W-phase coil input terminal W 41 and W-phase coil output terminal W 42 The U-phase coil input terminal U 21 , U-phase coil output terminal U 22 , V-phase coil input terminal V 31 , V-phase coil output terminal V 32 , W-phase coil input terminal W 41 , W-phase coil output terminal W 42 The long U-phase coil 2, the long V-phase coil 3, and the long W-phase coil 4 each extend in the circumferential direction while repeating wavy up and down curves in the axial direction 100 as shown in FIG. 1 so that the entire coils are located close to each other in the circumferential direction.

[0040] Each of the U-phase coils 2, V-phase coil 3, and W-phase coil 4 is a long phase coil extending from a coil input end to a coil output end, and in the flattened state of FIG. 4, it extends in the left-right direction perpendicular to the up-down direction while repeating up-down wavy curves in FIG. 4, and in the cylindrical state of FIG. 1, it extends in the circumferential direction while repeating up-down wavy curves in the axial direction 100. An example of an embodiment in which the input ends and output ends of each of the U-phase coil 2, V-phase coil 3, and W-phase coil 4 are located in close proximity to each other as described above in the state of cylindrical coil 1 will be described with reference to FIGS. 8 to 12.

[0041] Fig. 8 is a partially omitted perspective view showing an example of the arrangement of each phase coil in the right end portion (Fig. 5(b)) of Fig. 4 in the flat coil 11 in the state shown in Fig. 4. It will be explained how each phase coil in the right portion of Fig. 4 curves in a wavy shape in the up-down direction of Fig. 4 while extending in the left-right direction of Fig. 4.

[0042] In the W-phase coil 4, the lower curved portion W 71 From the coil part W 4-2 And the coil part W 4-1 The coil part W is stretched. 4-2 is the W-phase coil output terminal W 42 to W-phase coil input terminal W 41 The coil part W extends in the opposite direction. 4-1 is the W-phase coil input terminal W 41 to W-phase coil output terminal W 42 It is the coil part that extends in the forward direction toward the center.

[0043] In the V-phase coil 3, the lower curved portion V 71 From the coil part V 3-2 and the coil part V 3-1 The coil part V is stretched. 3-2 is the V-phase coil output terminal V 32 to V-phase coil input terminal V 31 The coil part V extends in the opposite direction. 3-1 is the V-phase coil input terminal V 31 to V-phase coil output terminal V 32 It is the coil part that extends in the forward direction toward the center.

[0044] In the U-phase coil 2, the lower curved portion U 71 From the coil part U 2-2 and the coil part U 2-1 The coil part U is stretched. 2-2 is the U-phase coil output terminal U 22 to U-phase coil input terminal U 21 The coil part U extends in the opposite direction. 2-1 is the U-phase coil input terminal U 21 to U-phase coil output terminal U 22 It is the coil part that extends in the forward direction toward the center.

[0045] 8, the V-phase coil 3 is disposed to the right of the drawing relative to the W-phase coil 4. Also, the U-phase coil 2 is disposed to the right of the drawing relative to the V-phase coil 3.

[0046] FIG. 9 is a perspective view with some parts omitted, showing an example in which each phase coil extends in the left-right direction perpendicular to the up-down direction in FIG. 4 while repeating wavy curves in the up-down direction from the state shown in FIG.

[0047] Coil part W 4-2 is the curved part W 71 The curved part W is on the opposite side in the vertical direction to 72 Then it curves again at the curved part W 71 In the direction of the curved part W 71 On the side where the curved part W 71 The next curved part W is shifted to the right in FIG. 8 from the position where 73 Then it curves again at the curved part W 72 Thus, the coil portion W constituting the W-phase coil 4 4-2 9, which is the circumferential direction when the cylindrical coil 1 is constructed, while repeating a wavy up and down curve in the axial direction 100 when the cylindrical coil 1 is constructed.

[0048] Coil part V 3-2 is the curved part V 71The curved part V, which is the opposite side in the vertical direction to 72 Then it curves again at the curved part V 71 The curved part V 71 On the side where there is a curved part V 71 The next curved part V is shifted to the right in Figure 9 from the position where 73 Then it curves again at the curved part V 72 Thus, the coil portion V constituting the V-phase coil 3 3-2 9, which is the circumferential direction when the cylindrical coil 1 is constructed, while repeating a wavy up and down curve in the axial direction 100 when the cylindrical coil 1 is constructed.

[0049] Coil part U 2-2 is the curved part U 71 The curved part U is on the opposite side in the vertical direction to 72 Then it curves again at U 71 The curved part U 71 On the side where 71 The next curved part U is shifted to the right in Figure 8 from the position where 73 Then it curves again at U 72 Thus, the coil portion U that constitutes the U-phase coil 2 2-2 9, which is the circumferential direction when the cylindrical coil 1 is constructed, while repeating a wavy up and down curve in the axial direction 100 when the cylindrical coil 1 is constructed.

[0050] In the embodiment shown in FIG. 9, the curved portion W of the W-phase coil 4 71 The curved portion V of the V-phase coil 3 71 The curved part W of the W-phase coil 4 is shifted to the right side of the drawing. 71 The curved part V of the V-phase coil 3 is located on the upper side (the front side of the drawing). 71 In addition, the curved portion V of the V-phase coil 3 is 71 The curved portion U of the U-phase coil 2 71 The curved part V of the V-phase coil 3 is shifted to the right side of the drawing. 71 The curved part U of U-phase coil 2 is located on the upper side (front side of the drawing). 71are placed.

[0051] In the embodiment shown in FIG. 9, the curved portion W of the W-phase coil 4 72 The curved portion V of the V-phase coil 3 72 The curved part W of the W-phase coil 4 is shifted to the right side of the drawing. 72 The curved part V of the V-phase coil 3 is located below (the rear side of the drawing). 72 In addition, the curved portion V of the V-phase coil 3 is 72 The curved portion U of the U-phase coil 2 72 The curved part V of the V-phase coil 3 is shifted to the right side of the drawing. 72 The curved part U of U-phase coil 2 is located below (back side of the drawing). 72 are placed.

[0052] In the embodiment shown in FIG. 9, the curved portion W 73 The curved portion V of the V-phase coil 3 73 The curved part W of the W-phase coil 4 is shifted to the right side of the drawing. 73 The curved part V of the V-phase coil 3 is located on the upper side (the front side of the drawing). 73 In addition, the curved portion V of the V-phase coil 3 is 73 The curved portion U of the U-phase coil 2 73 The curved part V of the V-phase coil 3 is shifted to the right side of the drawing. 73 The curved part U of U-phase coil 2 is located on the upper side (front side of the drawing). 73 are placed.

[0053] Coil part W of W-phase coil 4 4-2 And the coil part W 4-1 In the overlapping portion D1 in FIG. 9, the coil portion W 4-2 is the coil part W 4-1 It is positioned so that it overlaps the upper side (the front side of the drawing).

[0054] Coil part V of V-phase coil 3 3-2 and the coil part V 3-1 In the overlapping portion D2 in FIG. 9, the coil portion V 3-2 is the coil part V 3-1 It is positioned so that it overlaps the upper side (the front side of the drawing).

[0055] Coil part U of U-phase coil 2 2-2 and the coil part U 2-1 In the overlapping portion D3 in FIG. 98, the coil portion V 2-2 is the coil part V 2-1 It is positioned so that it overlaps the upper side (the front side of the drawing).

[0056] In FIG. 9, the locations indicated by symbols D1, D2, and D3 are the phase coil input terminals U 21 , V 21 , W 21 From each phase coil output terminal U 22 , V 22 , W 22 The coil portion U which is the forward axial portion of each phase coil extending in the axial direction 100 in the forward direction toward 2-1 , V 3-1 , W 4-1 and the phase coil output terminal U of each of the phase coils 2, 3, and 4. 22 , V 22 , W 22 From each phase coil input terminal U 21 , V 21 , W 21 The coil portion U which is the opposite axial portion of each phase coil extending in the axial direction 100 in the opposite direction toward 2-2 , V 3-2 , W 4-2 When the cylindrical member 104 is formed as shown in FIG. 1, these intersect so as to overlap each other in the radial direction perpendicular to the axial direction 100.

[0057] FIG. 10 is a perspective view with some parts omitted, showing an example in which each phase coil extends in a left-right direction perpendicular to the up-down direction while repeating a wavy curve in the up-down direction of FIG. 4, subsequent to the state shown in FIG.

[0058] As shown in FIG. 9, the curved portion W 73 Then it curves again at the curved part W 72 The coil part W facing the direction 4-2 is the curved part W 72 On the side where the curved part W 72The next curved part W is shifted to the right in FIG. 10 from the position where 74 Then it curves again at the curved part W 71 , W 73 moves in the direction where

[0059] On the other hand, the coil part W 4-1 is the curved part W 71 From curved section W 72 The curved part W extends toward the side where the 72 On the side where the curved portion W exists 72 10 from the position where the curved portion W 74 In FIG. 10, the curved portion W is shifted to the left. 75 Then it curves again at the curved part W 71 , W 73 In the direction of the curved part W 73 The next curved part W is shifted to the right in FIG. 10 from the position where 76 Then it curves again at the curved part W 72 , W 75 , W 74 moves in the direction where

[0060] As shown in FIG. 9, the curved portion V 73 Then it curves again at the curved part V 72 The coil part V facing the direction 3-2 is the curved part V 72 On the side where there is a curved part V 72 The next curved part V is shifted to the right in Figure 10 from the position where 74 Then it curves again at the curved part V 71 , V 73 moves in the direction where

[0061] On the other hand, the coil part V 3-1 is the curved part V 71 From curved section V 72 The curved part V extends toward the side where the 72 On the side where the curved part V 72 10 from the position where the curved portion V74 In FIG. 10, the curved portion V is shifted to the left. 75 Then it curves again at the curved part V 71 , V 73 The curved part V 73 The next curved part V is shifted to the right in Figure 10 from the position where 76 Then it curves again at the curved part V 72 , V 75 , V 74 moves in the direction where

[0062] As shown in FIG. 9, the curved section U 73 Then it curves again at U 72 The coil part U facing the direction 2-2 is the curved part U 72 On the side where 72 The next curved part U is shifted to the right in Figure 10 from the position where 74 Then it curves again at U 71 , U 73 moves in the direction where

[0063] On the other hand, the coil part U 2-1 is the curved part U 71 From curved section U 72 The curved part U extends toward the side where 72 On the side where the curved part U exists, 72 10 from the position where the curved portion U 74 In FIG. 10, the curved portion U is shifted to the left. 75 Then it curves again at U 71 , U 73 The curved part U 73 The next curved part U is shifted to the right in Figure 10 from the position where 76 Then it curves again at U 72 , U 75 , U 74 moves in the direction where

[0064] In the embodiment shown in FIG. 71The curved portion W of the W-phase coil 4 73 The curved part U of U-phase coil 2 is shifted to the right side of the drawing. 71 The curved part W of the W-phase coil 4 is located on the upper side (the front side of the drawing). 73 The curved portion W of the W-phase coil 4 is also arranged. 73 The curved portion V of the V-phase coil 3 73 The curved part W of the W-phase coil 4 is shifted to the right side of the drawing. 73 The curved part V of the V-phase coil 3 is located on the upper side (the front side of the drawing). 73 The curved portion V of the V-phase coil 3 is arranged. 73 The curved portion U of the U-phase coil 2 73 The curved part V of the V-phase coil 3 is shifted to the right side of the drawing. 73 The curved part U of U-phase coil 2 is located on the upper side (front side of the drawing). 73 are placed.

[0065] Furthermore, the curved portion U of the U-phase coil 2 73 The curved portion W of the W-phase coil 4 76 The curved part U of U-phase coil 2 is shifted to the right side of the drawing. 73 The curved part W of the W-phase coil 4 is located on the upper side (the front side of the drawing). 76 The curved portion W of the W-phase coil 4 is arranged. 76 The curved portion V of the V-phase coil 3 76 The curved part W of the W-phase coil 4 is shifted to the right side of the drawing. 76 The curved part V of the V-phase coil 3 is located on the upper side (the front side of the drawing). 76 The curved portion V of the V-phase coil 3 is arranged. 76 The curved portion U of the U-phase coil 2 76 The curved part V of the V-phase coil 3 is shifted to the right side of the drawing. 76 The curved part U of U-phase coil 2 is located on the upper side (front side of the drawing). 76 are placed.

[0066] In the embodiment shown in FIG. 10, the curved portion U of the U-phase coil 2 72 The curved portion W of the W-phase coil 4 75 The curved part U of U-phase coil 2 is shifted to the right side of the drawing. 72 The curved part W of the W-phase coil 4 is located below (the rear side of the drawing). 75The curved portion W of the W-phase coil 4 is also arranged. 75 The curved portion V of the V-phase coil 3 75 The curved part W of the W-phase coil 4 is shifted to the right side of the drawing. 75 The curved part V of the V-phase coil 3 is located below (the rear side of the drawing). 75 The curved portion V of the V-phase coil 3 is arranged. 75 The curved portion U of the U-phase coil 2 75 The curved part V of the V-phase coil 3 is shifted to the right side of the drawing. 75 The curved part U of U-phase coil 2 is located below (back side of the drawing). 75 are placed.

[0067] The curved portion U of the U-phase coil 2 75 The curved portion W of the W-phase coil 4 74 The curved part U of U-phase coil 2 is shifted to the right side of the drawing. 75 The curved part W of the W-phase coil 4 is located below (the rear side of the drawing). 74 The curved portion W of the W-phase coil 4 is arranged. 74 The curved portion V of the V-phase coil 3 74 The curved part W of the W-phase coil 4 is shifted to the right side of the drawing. 74 The curved part V of the V-phase coil 3 is located below (the rear side of the drawing). 74 The curved portion V of the V-phase coil 3 is arranged. 74 The curved portion U of the U-phase coil 2 74 The curved part V of the V-phase coil 3 is shifted to the right side of the drawing. 74 The curved part U of U-phase coil 2 is located below (back side of the drawing). 74 are placed.

[0068] 11 and 12 are perspective views with some parts omitted, showing an example of the arrangement of each phase coil in the left end portion (FIG. 5(a)) of FIG. 4 in the flat coil 11 in the state shown in FIG. 4. We will explain how each phase coil in the left portion of FIG. 4 curves in a wavy shape in the up-down direction and extends in the left-right direction of FIG. 4.

[0069] 11 and 12, the V-phase coil 3 is disposed to the right of the drawing relative to the U-phase coil 2. Also, the W-phase coil 4 is disposed to the right of the drawing relative to the V-phase coil 3.

[0070] 11 and 12, each phase coil extends in the left-right direction perpendicular to the up-down direction in FIG. 4 while repeating wavy curves in the up-down direction, and as shown in FIG. 1, each of the long U-phase coil 2, V-phase coil 3, and W-phase coil 4 extends in the circumferential direction while repeating wavy up-down curves in the axial direction 100 shown in FIG. 1, so that in each of the U-phase coil 2, V-phase coil 3, and W-phase coil 4, as shown in FIG. 1, 21 , U-phase coil output terminal U 22 , V-phase coil input terminal V 31 , V-phase coil output terminal V 32 , W-phase coil input terminal W 41 , W-phase coil output terminal W 42 FIG. 13 is a perspective view with some parts omitted, illustrating an example in which the entirety of the first and second coils are positioned close to each other in the circumferential direction.

[0071] For U-phase coil 2, U-phase coil input terminal U 21 to U-phase coil output terminal U 22 The coil part U is the part of the coil that extends in the forward direction toward 2-1 is the upper curved part U in the left part of FIG. 7n Curved at U 7n The curved part U is on the opposite side in the vertical direction to 7(n-1) The curved part U 7(n-1) Then it curves again at the curved part W 7n In the direction of the curved part W 7n On the side where the curved part W 7n The next curved part W is shifted to the right in Figures 11 and 12 from the position where 7(n-2) Then it curves again at the curved part W 7(n-1) Thus, the coil portion U that constitutes the U-phase coil 2 2-111 and 12, which is the circumferential direction when the cylindrical coil 1 is constructed, while repeating a wavy up and down curve in the axial direction 100 when the cylindrical coil 1 is constructed.

[0072] Also, U-phase coil output terminal U 22 to U-phase coil input terminal U 21 The coil part U is the part of the coil that extends in the opposite direction to the 2-2 is the curved part U 7n , curved section U 7(n-2) On the side where the curved part U 7n On the right side of the drawing, the curved part U 7(n-2) The curved part U located on the left side in the drawing 7(n-3) Curved at U 7(n-1) The curved part U 7(n-4) Then it curves again at U 7n , U 7(n-3) Thus, the coil portion U that constitutes the U-phase coil 2 2-2 11 and 12, which is the circumferential direction when the cylindrical coil 1 is constructed, while repeating a wavy up and down curve in the axial direction 100 when the cylindrical coil 1 is constructed.

[0073] For V-phase coil 3, V-phase coil input terminal V 31 to V-phase coil output terminal U 32 The coil part V extends in the forward direction toward 3-1 is the upper curved portion V in the left part of FIG. 7n Curved at V 7n The curved part V, which is the opposite side in the vertical direction to 7(n-1) The curved part V 7(n-1) Then it curves again at the curved part V 7n The curved part V 7n On the side where there is a curved part V 7n The next curved part V, which is shifted to the right in Figures 11 and 12 from the position where 7(n-2) Then it curves again at the curved part V 7(n-1) Thus, the coil portion V constituting the V-phase coil 32-1 11 and 12, which is the circumferential direction when the cylindrical coil 1 is constructed, while repeating a wavy up and down curve in the axial direction 100 when the cylindrical coil 1 is constructed.

[0074] Also, V-phase coil output terminal V 22 to V-phase coil input terminal V 21 The coil part V extends in the opposite direction to the coil part V. 2-2 is the curved part V 7n , curved section V 7(n-2) On the side where the curved part V 7n On the right side of the drawing, the curved part V 7(n-2) The curved part V located on the left side in the drawing 7(n-3) Curved at V 7(n-1) The curved part V 7(n-4) Then it curves again at the curved part V 7n , V 7(n-3) Thus, the coil portion V constituting the V-phase coil 3 2-2 11 and 12, which is the circumferential direction when the cylindrical coil 1 is constructed, while repeating a wavy up and down curve in the axial direction 100 when the cylindrical coil 1 is constructed.

[0075] For W-phase coil 4, the W-phase coil input terminal W 41 to W-phase coil output terminal W 42 The coil part W extends in the forward direction toward 3-1 is the upper curved portion W in the left part of FIG. 7n Curved at W 7n The curved part W is on the opposite side in the vertical direction to 7(n-1) In the direction of the curved part W 7(n-1) Then it curves again at the curved part W 7n In the direction of the curved part W 7n On the side where the curved part W 7n The next curved part W is shifted to the right in Figures 11 and 12 from the position where 7(n-2) Then it curves again at the curved part W 7(n-1)Thus, the coil portion W constituting the W-phase coil 4 2-1 11 and 12, which is the circumferential direction when the cylindrical coil 1 is constructed, while repeating a wavy up and down curve in the axial direction 100 when the cylindrical coil 1 is constructed.

[0076] Also, W-phase coil output terminal W 42 to W-phase coil input terminal W 41 The coil part W extends in the opposite direction to the 4-2 is the curved part W 7n , curved section W 7(n-2) On the side where the curved portion W 7n On the right side of the drawing, the curved part W 7(n-2) The curved part W located on the left side in the drawing 7(n-3) Curved at W 7(n-1) Then it bends again to the curved part W 7(n-3) Thus, the coil portion V constituting the V-phase coil 3 2-2 11 and 12, which is the circumferential direction when the cylindrical coil 1 is constructed, while repeating a wavy up and down curve in the axial direction 100 when the cylindrical coil 1 is constructed.

[0077] In the embodiment shown in FIG. 11 and FIG. 12, the curved portion U of the U-phase coil 2 7n The curved portion V of the V-phase coil 3 7n The curved part U of U-phase coil 2 is shifted to the right side of the drawing. 7n The curved part V of the V-phase coil 3 is located below (the rear side of the drawing). 7n are placed.

[0078] Curved portion V of V-phase coil 3 7n The curved portion W of the W-phase coil 4 7n The curved part V of the V-phase coil 3 is shifted to the right side of the drawing. 7n The curved part W of the W-phase coil 4 is located below (the rear side of the drawing). 7n are placed.

[0079] Curved portion U of U-phase coil 2 7(n-1)The curved portion V of the V-phase coil 3 7(n-1) The curved part U of U-phase coil 2 is shifted to the right side of the drawing. 7(n-1) The curved part V of the V-phase coil 3 is located on the upper side (the front side of the drawing). 7(n-1) are placed.

[0080] Curved portion V of V-phase coil 3 7(n-1) The curved portion W of the W-phase coil 4 7(n-1) The curved part V of the V-phase coil 3 is shifted to the right side of the drawing. 7(n-1) The curved part W of the W-phase coil 4 is located on the upper side (the front side of the drawing). 7(n-1) are placed.

[0081] Curved portion W of W-phase coil 4 7n The curved portion U of the U-phase coil 2 7(n-3) The curved part W of the W-phase coil 4 is shifted to the right side of the drawing. 7n The curved part U of U-phase coil 2 is located below (back side of the drawing). 7(n-3) are placed.

[0082] Curved portion U of U-phase coil 2 7(n-3) The curved portion V of the V-phase coil 3 7(n-3) The curved part U of U-phase coil 2 is shifted to the right side of the drawing. 7(n-3) The curved part V of the V-phase coil 3 is located below (the rear side of the drawing). 7(n-3) are placed.

[0083] Curved portion U of V-phase coil 3 7(n-3) The curved portion W of the W-phase coil 4 7(n-3) The curved part V of the V-phase coil 3 is shifted to the right side of the drawing. 7(n-3) The curved part W of the W-phase coil 4 is located below (the rear side of the drawing). 7(n-3) are located Coil part U of U-phase coil 2 2-1 and the coil part U 2-2 The overlapping portion D in Figs. 11 and 12 n Now, the coil part U 2-1 is the coil part U 2-2 It is positioned so that it overlaps the upper side (the front side of the drawing).

[0084] Coil part V of V-phase coil 33-1 and the coil part V 3-2 The overlapping portion D in Figs. 11 and 12 n-1 Now, the coil part V 3-1 is the coil part V 3-2 It is positioned so that it overlaps the upper side (the front side of the drawing).

[0085] Coil part W of W-phase coil 4 4-1 And the coil part W 4-2 The overlapping portion D in Figs. 11 and 12 n-2 Now, the coil part W 4-1 is the coil part W 4-2 It is positioned so that it overlaps the upper side (the front side of the drawing).

[0086] Coil part W of W-phase coil 4 4-1 And the coil part W 4-2 The overlapping portion D in Figs. 11 and 12 n-2 The symbol D on the right side in the drawing n-3 At the location indicated by, the coil portion U of the U-phase coil 2 is again 2-1 and the coil part U 2-2 Here, the coil part U 2-2 is the coil part U 2-1 It will be positioned so that it overlaps the top side (the front side of the drawing).

[0087] Coil part U of U-phase coil 2 2-1 and the coil part U 2-2 The overlapping portion D in Figs. 11 and 12 n-3 The symbol D on the right side in the drawing n-4 At the location indicated by, the coil portion V of the V-phase coil 3 is again 3-1 and the coil part V 3-2 Here, the coil part V 3-2 is the coil part V 3-1 It will be positioned so that it overlaps the top side (the front side of the drawing).

[0088] Coil part V of V-phase coil 3 3-1 and the coil part V 3-2 The overlapping portion D in Figs. 11 and 12 n-4 The symbol D on the right side in the drawingn-5 At the location indicated by, the coil portion W of the W-phase coil 4 is again 4-1 And the coil part W 4-2 Here, the coil part W 4-2 is the coil part W 4-1 It will be positioned so that it overlaps the top side (the front side of the drawing).

[0089] In FIG. 9, the locations indicated by symbols D1, D2, and D3 are the phase coil input terminals U 21 , V 21 , W 21 From each phase coil output terminal U 22 , V 22 , W 22 The coil portion U which is the forward axial portion of each phase coil extending in the axial direction 100 in the forward direction toward 2-1 , V 3-1 , W 4-1 and the phase coil output terminal U of each of the phase coils 2, 3, and 4. 22 , V 22 , W 22 From each phase coil input terminal U 21 , V 21 , W 21 The coil portion U which is the opposite axial portion of each phase coil extending in the axial direction 100 in the opposite direction toward 2-2 , V 3-2 , W 4-2 When the cylindrical member 104 is formed as shown in FIG. 1, these intersect so as to overlap each other in the radial direction perpendicular to the axial direction 100.

[0090] Similarly, in Figs. n , D n-1 , D n-2 , D n-3 , D n-4 , D n-5 The points indicated by are the phase coil input terminals U of phase coils 2, 3, and 4. 21 , V 21 , W 21 From each phase coil output terminal U 22 , V 22 , W 22The coil portion U which is the forward axial portion of each phase coil extending in the axial direction 100 in the forward direction toward 2-1 , V 3-1 , W 4-1 and the phase coil output terminal U of each of the phase coils 2, 3, and 4. 22 , V 22 , W 22 From each phase coil input terminal U 21 , V 21 , W 21 The coil portion U which is the opposite axial portion of each phase coil extending in the axial direction 100 in the opposite direction toward 2-2 , V 3-2 , W 4-2 When the cylindrical member 104 is formed as shown in FIG. 1, these intersect so as to overlap each other in the radial direction perpendicular to the axial direction 100.

[0091] In the arrangement configuration described above with reference to FIGS. 8 to 12, each of the long U-phase coil 2, V-phase coil 3, and W-phase coil 4 extends in the circumferential direction while repeating wavy up and down curves in the axial direction 100 shown in FIG. 1, so that in each of the U-phase coil 2, V-phase coil 3, and W-phase coil 4, as shown in FIG. 1, 21 , U-phase coil output terminal U 22 , V-phase coil input terminal V 31 , V-phase coil output terminal V 32 , W-phase coil input terminal W 41 , W-phase coil output terminal W 42 are entirely located close to each other in the circumferential direction.

[0092] That is, in each of the U-phase coil 2, the V-phase coil 3, and the W-phase coil 4, as shown in FIG. 21 , U-phase coil output terminal U 22 , V-phase coil input terminal V 31 , V-phase coil output terminal V 32 , W-phase coil input terminal W 41 , W-phase coil output terminal W 42 In the arrangement configuration described above with reference to FIGS. 8 to 12, in which the phase coil input terminals U21 , V 31 , W 41 From phase coil output terminal U 22 , V 32 , W 42 A forward axial portion U of the phase coils 2, 3, and 4 extending in the axial direction 100 in the forward direction toward the 2-1 , V 3-1 , W 4-1 and the phase coil output terminal U in phase coils 2, 3, and 4 22 , V 32 , W 42 From phase coil input terminal U 21 , V 31 , W 41 The opposite axial portion U of the phase coils 2, 3, 4 extends in the axial direction 100 in the opposite direction toward the 2-2 , V 3-2 , W 4-2 The phase coils 2, 3, and 4 extend in the circumferential direction and cross each other so as to overlap in the radial direction perpendicular to the axial direction 100.

[0093] And, this forward axial portion U 2-1 , V 3-1 , W 4-1 and the opposite axial portion U 2-2 , V 3-2 , W 4-2 At the overlapping intersections between the intersections D1, D2, D3, and D n , D n-1 , D n-2 , D n-3 , D n-4 , D n-5 For each, the forward axial portion U 2-1 , V 3-1 , W 4-1 and the opposite axial portion U 2-2 , V 3-2 , W 4-2 The positions of the inner and outer portions are switched in the radial direction perpendicular to the axial direction 100.

[0094] In addition, the intersection positions D1, D2, D3, and D n , D n-1 , D n-2 , D n-3 , Dn-4 , D n-5 As shown in the figure, the forward axial portion U 2-1 , V 3-1 , W 4-1 and the opposite axial portion U 2-2 , V 3-2 , W 4-2 The overlapping intersections between the forward axial portions U of each of the phase coils 2, 3, and 4 are 2-1 and the opposite axial direction part U 2-2 Between the forward axial portion V 3-1 and the opposite axial portion V 3-2 Between and the forward axial portion W 4-1 and the opposite axial part W 4-2 This is only done between

[0095] The forward axial portions U of the phase coils 2, 3, and 4 are adjacent to each other in the circumferential direction. 2-1 , V 3-1 , W 4-1 and the opposite axial direction part U 2-2 , V 3-2 , W 4-2 Between the intersection positions between the forward axial portion U of one or more other phase coils 2, 3, 4 2-1 , V 3-1 , W 4-1 and the opposite axial direction part U 2-2 , V 3-2 , W 4-2 The crossover between the two is performed.

[0096] In FIG. 12, the coil portion U of the U-phase coil 2 2-1 and the coil part U 2-2 The intersection point D in Figs. n and D n-3 Between n-1 At the intersection point of V-phase coil 3, coil portion V 3-1 and the coil part V 3-2 and cross, D n-2 At the intersection point of W-phase coil 4, 4-1 And the coil part W 4-2 and are intersecting.

[0097] Because of this structure, when viewed from the side in an enlarged state as shown in Figure 12, the intersection position D n , D n-1 , D n-2 , D n-3 , D n-4 , D n-5 There is a minute gap between the phase coils 2, 3, and 4, which is a gap penetrating the cylindrical coil 1 in the radial direction. n , D n-1 , D n-2 , D n-3 , D n-4 , D n-5 The gaps between the adjacent wires are uniformly formed in the circumferential direction of the cylindrical coil 1.

[0098] This gap becomes a passage for the fluid that flows radially through the cylindrical coil 1. Therefore, it becomes possible to make the refrigerant flow radially through the cylindrical coil 1 by utilizing this gap.

[0099] 13 and 14 are conceptual diagrams for explaining an example of a case where a cylindrical yoke 102 having magnets arranged on its inner circumferential surface is arranged on the radially outer side of the cylindrical coil 1 of this embodiment to configure a rotating electric machine 102. In this way, when the cylindrical coil of this embodiment is combined with a rotor and used in a rotating electric machine, the cylindrical coil generates heat when electricity is applied to the cylindrical coil. It is conceivable that a refrigerant such as a liquid material is accommodated in a housing constituting the rotating electric machine, and the refrigerant flows and splashes in the housing by the rotation of the rotor to cool the heating body. In such a case, as described above, the above-mentioned gaps formed evenly in the circumferential direction in the peripheral wall constituting the cylindrical coil 1 are used as a flow path for the refrigerant, thereby making it possible to efficiently cool the heating body.

[0100] The cylindrical coil 1 of the above-mentioned embodiment described with reference to Figs. 1 to 12 is composed of three or more coils. Each of the coils is made by bundling a plurality of long conductor wires that have been insulated into one, and winding or meandering the bundled wire in the same pattern as described above between the input end and the output end to form a strip-shaped coil material. The strip-shaped coil material thus prepared is prepared for the number of phases to be used (for example, three phases, U phase, V phase, and W phase), and the coil body is formed into a ring so that the input end and output end of the strip-shaped coil material for each phase are positioned close to each other in the circumferential direction.

[0101] As described above, each of the multiple coils corresponding to the multiple phases is made by bundling multiple long conductors that have been insulated into one piece, and then winding or meandering the single bundled wire repeatedly in the same pattern from the input end to the output end to create a strip-shaped coil material. As a result, multiple wires are wound together, which simplifies winding and facilitates automation of winding production.

[0102] The cylindrical coil 1 of this embodiment has the above-mentioned configuration and structure, and therefore does not generate circulating current or regenerative power.

[0103] Each of the multiple long phase coils that make up the multi-phase cylindrical coil is formed by bundling multiple long conductive wires, so the specifications can be easily changed to various numbers of coils and connection patterns by selecting the number of wires used in the phase coils.

[0104] Each of the multiple long phase coils constituting the multiple-phase cylindrical coil is formed by bundling multiple long conductive wires, and each conductive wire becomes a coil. That is, when six conductive wires are used as in the above-mentioned embodiment, six coils are formed.

[0105] The wire for the desired number of coils is bundled together and extends in the circumferential direction of the cylindrical coil, repeating wavy up and down curves in the axial direction of the cylindrical coil.

[0106] The number of coils is determined by the number of wires, which reduces the variation in the coils, suppresses the generation of circulating currents, and makes the coil easier to manufacture.

[0107] Since there is no concept of coil units during manufacturing, circulating currents due to variations in the shape and position of each coil unit are less likely to occur.

[0108] By bundling the same number of wires as the desired number of coils and winding them together in a serpentine pattern, there is no need to adjust the coils individually, a homogeneous coil body can be produced, and copper loss is reduced because the amount of wire material at the upper and lower ends is reduced.

[0109] According to the cylindrical coil of this embodiment, the amount of wire is reduced, which not only reduces costs but also reduces copper loss, improving motor efficiency.

[0110] When conventionally known turtle-shell shaped coil units are joined together to form a cylinder, the top and bottom of the cylinder, which is the direction in which the rotation axis extends, protrude in a wavy pattern. These protruding parts do not contribute to the motor characteristics. Moreover, these parts that do not contribute to the motor characteristics are copper loss, which is a negative factor in motor efficiency. From this perspective, the band-shaped coil material formed by repeatedly winding or meandering in the same pattern in the above-mentioned embodiment can eliminate such inconveniences.

[0111] In the above-mentioned embodiment, the band-shaped coil material is formed by repeatedly winding or meandering in the same pattern, and the thickness of the upper and lower protruding parts can be made substantially equal in two layers. When the conventionally known turtle-shell shaped coil units are joined together to form a cylinder, the upper and lower protruding parts do not contribute to the motor torque. In the above-mentioned embodiment, the band-shaped coil material is formed by repeatedly winding or meandering in the same pattern, so that the whole is made into two layers, and the protruding part also contributes to a certain extent, so there is no waste of the coil, and the amount of winding used is reduced, so copper loss is reduced, and the strength is improved by making the thickness uniform.The uniform thickness allows for more freedom in the installation position of the coil inside the motor.

[0112] Although an embodiment of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiment and can be modified in various ways within the technical scope understood from the description of the claims.

Claims

1. A cylindrical coil having a plurality of phases, which are arranged concentrically with respect to an axial direction along which a rotation shaft of a rotating electric machine extends, and which surrounds the axial direction in a circumferential direction that is a circumferential direction with respect to the axial direction, a plurality of phase coils each constituting one of the plurality of phases and each having a phase coil input end and a phase coil output end are arranged such that one of the phase coils is shifted from the other phase coils in the circumferential direction, thereby forming the cylindrical coil; Each of the phase coils has a wire input end and a wire output end, and each of the phase coils is formed by bundling a plurality of conductive wires extending from the wire input end located at the phase coil input end to the wire output end located at the phase coil output end, Each of the phase coils extends in the circumferential direction while repeating a wavy up-down curve in the axial direction. Cylindrical coil.

2. a forward-side axial portion of one of the phase coils extending in the axial direction in a forward direction from the phase coil input end to the phase coil output end of the one of the phase coils; an opposite axial portion of the one of the phase coils extending in the axial direction in an opposite direction from the phase coil output end toward the phase coil input end of the one of the phase coils; The phase coils extend in the circumferential direction so as to overlap each other in a radial direction perpendicular to the axial direction, the phase coil input terminal and the phase coil output terminal of each of the plurality of phase coils are located close to each other, At the intersections between the forward axial portion and the reverse axial portion, the positions of the forward axial portion and the reverse axial portion are interchanged inward and outward in the radial direction at each intersection position adjacent to each other in the circumferential direction.

2. The cylindrical coil according to claim 1.

3. The overlapping intersection between the forward axial portion and the reverse axial portion is performed only between the forward axial portion and the reverse axial portion of each of the phase coils, The intersection between the forward axial portion and the reverse axial portion in one or more other phase coils is performed between the intersection positions between the forward axial portion and the reverse axial portion in one of the phase coils that are adjacent to each other in the circumferential direction.

3. The cylindrical coil according to claim 2.

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