A coil body suitable for an ironless rotating motor

Abstract

The present invention relates to the field of coil bodies, and more specifically, to a coil body suitable for use in coreless rotating motors. The coil body comprises a U-phase coil portion constituting the U phase, a V-phase coil portion constituting the V phase, and a W-phase coil portion constituting the W phase, forming a coil group. Multiple coil groups are sequentially connected on the same plane to form a ring-shaped cylindrical coil body. The U-phase coil portion at the head end of the cylindrical coil body is electrically connected to the U-phase coil portion at the end in the circumferential direction, the V-phase coil portion at the head end is electrically connected to the V-phase coil portion at the end in the circumferential direction, or the W-phase coil portion at the head end is electrically connected to the W-phase coil portion at the end in the circumferential direction via conductive wiring. This reduces the space occupied, achieves miniaturization, and has the ability to flow a large current.

Description

Technical Field

[0001] The present invention relates to the field of coil bodies, and in particular to a coil body suitable for an iron-coreless rotating motor. Background Art

[0002] In the technical field of rotating electrical machines, coreless rotating electrical machines have been widely used. Various proposals have been made for coil bodies used in coreless rotating electrical machines.

[0003] For example, Patent Document 1: Patent Gazette No. 3704044 proposes a solution, which involves etching a conductive plate-like body (e.g., a copper plate), forming two thin metal plates with conductive patterns formed on them as cylinders, and then concentrically winding the two cylinders as an inner cylinder and an outer cylinder. Each cylinder has a complementary pattern of conductive tapes connected to each other through the ends to form an electrical circuit. A layer of non-conductive fiber strands is also formed between the cylinders, and the conductive tape of the inner cylinder and the conductive tape of the outer cylinder can be kept insulated from each other by this strand layer. The coil body is coated with a filling material between the conductive tape portion and the non-conductive fiber strands. The filling material can be a polyimide material.

[0004] In addition, Patent Document 2: Japanese Patent Application Publication No. 2017-70140 proposes another solution, which is to bend a conductive sheet having multiple conductive strips until each conductive sheet is bent into a cylindrical shape to form a coil body. Summary of the Invention

[0005] The present invention provides a coil body suitable for an ironless rotating electric machine. The coil body comprises a U-phase coil portion constituting the U phase, a V-phase coil portion constituting the V phase, and a W-phase coil portion constituting the W phase, forming a coil group. Multiple coil groups are arranged in sequence to form an annular cylindrical body. This annular cylindrical body serves as the coil body for the ironless rotating electric machine of the present invention. The coil body of the present invention reduces space requirements and achieves miniaturization while still being capable of carrying relatively high currents.

[0006] A coil body suitable for an ironless rotating electric machine includes: a coil group consisting of a U-phase coil portion constituting a U phase, a V-phase coil portion constituting a V phase, and a W-phase coil portion constituting a W phase; a plurality of the coil groups are sequentially connected on the same plane to form a ring-shaped cylindrical coil body.

[0007] Optionally, any U-phase coil portion and the U-phase coil portion adjacent in the circumferential direction of the cylindrical coil body, any V-phase coil portion and the V-phase coil portion adjacent in the circumferential direction of the cylindrical coil body, or any W-phase coil portion and the W-phase coil portion adjacent in the circumferential direction of the cylindrical coil body are electrically connected through conductive wiring.

[0008] Preferably, the wiring is provided on the cylindrical coil body, extending in the circumferential direction of the cylindrical coil body in an arc shape, and the small-diameter arc-shaped portion with a small curvature radius and the large-diameter arc-shaped portion with a large curvature radius are connected through a stepped step portion formed on the middle part of the circumference, and the radial inner side surface and the radial outer side surface of the cylindrical coil body have electrical insulation; the terminal portion of the U-phase coil portion, the terminal portion of the V-phase coil portion or the terminal portion of the W-phase coil portion are bent and inserted into the upper side of the two end portions of the arc-shaped extension provided on the circumferential surface of the cylindrical coil body to form a cylindrical coil body with a recess for electrical connection.

[0009] Optionally, the U-phase comprises a U-phase coil portion, a U-phase outer coil portion, and a U-phase inner coil portion. The U-phase outer coil portion is formed by extending the U-phase outer terminal portion on the upper end side of the cylindrical coil body toward the lower end of the cylindrical coil body and extending outward in the axial direction of the cylindrical coil body. On the cylindrical coil body, the U-phase inner coil portion is located on the inner side of the cylindrical coil body in the radial direction; the lower end side of the U-phase inner coil portion and the lower end side of the opposite U-phase outer coil portion are electrically connected; the U-phase coil portion extends toward the upper end of the cylindrical coil portion and extends toward the upper end of the cylindrical coil body in the axial direction of the cylindrical coil body; the terminal U-phase inner coil portion on the U-phase inner terminal portion is located in the radial inner side of the U-phase outer terminal portion; the insulation structure between the U-phase outer coil portion and the U-phase inner coil portion in the radial direction of the cylindrical coil body constitutes a coil body with a plurality of turns per phase.

[0010] The V-phase comprises a V-phase coil portion, a V-phase outer coil portion, and a V-phase inner coil portion. The V-phase outer coil portion is formed by extending the V-phase outer terminal portion on the upper end side of the cylindrical coil body toward the lower end of the cylindrical coil body and extending outward in the axial direction of the cylindrical coil body. On the cylindrical coil body, the V-phase inner coil portion is located on the inner side of the cylindrical coil body in the radial direction; the lower end side of the V-phase inner coil portion and the lower end side of the relative V-phase outer coil portion are electrically connected; the V-phase coil portion extends toward the upper end of the cylindrical coil portion and extends toward the upper end of the cylindrical coil body in the axial direction of the cylindrical coil body; the terminal V-phase inner coil portion on the V-phase inner terminal portion is located in the radial inner side direction of the V-phase outer terminal portion; the insulating structure between the V-phase outer coil portion and the V-phase inner coil portion in the radial direction of the cylindrical coil body constitutes a coil body with a plurality of turns per phase.

[0011] The W-phase coil portion of the W-phase is a W-phase outer coil portion extending from the W-phase outer terminal portion on the upper end side of the cylinder toward the lower end of the cylinder in the form of an axially extending portion of the cylinder; on the cylinder, the W-phase outer coil portion is located on the inner side in the radial direction; the lower end side is electrically connected to the lower end side of the W-phase outer coil portion; toward the upper end direction of the cylinder, the upper end side of the cylinder is extended in the form of an axially extending portion of the cylinder; the terminal W-phase inner coil portion is located on the inner W-phase inner terminal portion in the radial direction of the W-phase outer terminal portion; the structure of insulation between the W-phase outer coil portion and the W-phase inner coil portion in the radial direction of the cylinder constitutes a coil body with a plurality of turns per phase.

[0012] Optionally, the U-phase inner terminal portion on the upper end side of the U-phase coil portion and the U-phase inner terminal portion on the upper end side of the next U-phase coil portion in the circumferential direction of the coil body are electrically connected via a conductive inner wiring.

[0013] Optionally, the V-phase inner terminal portion on the upper end side of the V-phase coil portion and the V-phase inner terminal portion on the upper end side of the next V-phase coil portion in the circumferential direction are electrically connected via a conductive inner wiring.

[0014] Optionally, the W-phase inner terminal portion on the upper end side of the W-phase coil portion and the W-phase inner terminal portion on the upper end side of the next W-phase coil portion in the circumferential direction of the coil body are electrically connected via a conductive inner wiring.

[0015] Optionally, the U-phase outer terminal portion on the upper end side of the U-phase coil portion and the U-phase outer terminal portion on the upper end side of the next U-phase coil portion in the circumferential direction of the coil body are electrically connected via a conductive outer wiring.

[0016] Optionally, the V-phase outer terminal portion on the upper end side of the V-phase coil portion and the V-phase outer terminal portion on the upper end side of the next V-phase coil portion in the circumferential direction of the coil body are electrically connected via a conductive outer wiring.

[0017] Optionally, the W-phase outer terminal portion on the upper end side of the W-phase coil portion and the W-phase outer terminal portion on the upper end side of the next W-phase coil portion in the circumferential direction of the coil body are electrically connected via a conductive outer wiring.

[0018] In addition, the above-mentioned outer wiring is arranged on the outer circumferential side of the above-mentioned cylindrical coil body, and is in an arc shape when viewed from a horizontal plane, showing a form extending to the above-mentioned circumferential direction. The step part formed in the middle part of the above-mentioned circumferential direction, which is in a step shape when viewed from a horizontal plane, the small-diameter arc-shaped part with a small curvature radius is continuous with the large-diameter arc-shaped part with a large curvature radius, and has electrical insulation properties on the radial inner side and the radial outer side. When placed on the outer circumferential side of the above-mentioned cylindrical coil, on the upper side extending to the two end portions of the above-mentioned arc shape, the above-mentioned electrical connection recess is installed by bending and inserting the U-phase outer terminal on the above-mentioned upper end side, the V-phase outer terminal on the above-mentioned upper end side, or the W-phase outer terminal on the above-mentioned upper end side.

[0019] Advantageous Effects: The present invention provides a cylindrical coil body for an ironless rotating electric machine, comprising a U-phase coil portion constituting the U phase, a V-phase coil portion constituting the V phase, and a W-phase coil portion constituting the W phase. These multiple coil groups are arranged sequentially along the circumference of a cylindrical body in plan view, forming a circular ring. This reduces space and achieves miniaturization while still being able to carry high currents. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those skilled in the art by reading the detailed description of the preferred embodiment below.The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present application.

[0021] Figure 1 This is a schematic diagram omitting part of the structure of the coil body of the present invention.

[0022] Figure 2 for Figure 1 A partial enlarged schematic diagram of the coil body.

[0023] Figure 3 for Figure 1 The terminal portions on the upper end sides of the U-phase coil portion, the V-phase coil portion, and the W-phase coil portion of the center coil body are schematic diagrams showing an example of an arrangement form of a plurality of wires continuously arranged in the circumferential direction.

[0024] Figure 4 1 and 2 are drawings showing a wiring structure used in a coil body in one embodiment of the present invention, wherein (a) is a side view, (b) is a plan view, and (c) is a perspective view.

[0025] Figure 5 For electrical connection between the upper terminal parts of the radially outer sides of the U-phase coil part, V-phase coil part, and W-phase coil part, multiple Figure 4 The following is a plan view of the wiring connection status.

[0026] Figure 6 For electrical connection between the upper terminal parts of the radial inner side of the U-phase coil part, V-phase coil part, and W-phase coil part, multiple Figure 4 The following is a plan view of the wiring connection status.

[0027] Figure 7 For the electrical connection between the terminals on the radially inner side of the U-phase coil, V-phase coil, and W-phase coil, and the electrical connection between the terminals on the radially outer side, multiple Figure 4 The following is a plan view of the wiring connection status.

[0028] Figure 8 Schematic diagrams showing the wiring support portion used in the coil body in one embodiment of the present invention, wherein (a) is a perspective view of the inner support portion, and (b) is a perspective view of the outer support portion.

[0029] Figure 9 This is an explanatory diagram of a form in which, in the coil body of the present invention, the terminal portions on the upper end sides are electrically connected to each other via conductive wiring between the U-phase coil portion and the U-phase coil portion adjacent in the circumferential direction of the cylindrical coil body, between the V-phase coil portion and the phase coil portion adjacent in the circumferential direction of the cylindrical coil body, or between the W-phase coil portion and the W-phase coil portion adjacent in the circumferential direction of the cylindrical coil body in the coil body. The portion is omitted in the expanded view.

[0030] Among them: U1, U2 are U-phase coil parts; V1, V2 are V-phase coil parts; W1, W2 are W-phase coil parts; U101, U201 are U-phase outer terminal parts; U102, U202 are U-phase inner terminal parts; V101, V201 are V-phase outer terminal parts; V102, V202 are V-phase inner terminal parts; W101, W210 are W-phase outer terminal parts; W102, W202 are W-phase inner terminal parts; 401, 501, 601 are inner connections; 400, 500, 6 00 is the outer connection; 410, 510, 610 are step-shaped parts when viewed from above; 402, 502, 602 are small-diameter arc-shaped parts; 403, 503, 603 are large-diameter arc-shaped parts; 406, 407, 506, 507, 606, 607 are recessed parts; 404, 504, 604 are small-diameter arc-shaped parts; 405, 505, 605 are large-diameter arc-shaped parts; 408, 409, 508, 509, 608, 609 are recessed parts. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0032] The coils in this embodiment are composed of a U-phase coil portion constituting the U phase, a V-phase coil portion constituting the V phase, and a W-phase coil portion constituting the W phase as a coil group. Multiple coil groups are arranged in sequence to form an annular cylinder. The annular cylinder is the coil body used for the coreless rotating motor of the present invention.

[0033] In the coil 1 used in this three-phase rotating electric machine, the structure of U1 on the U-phase coil, V1 on the V-phase coil, and W1 on the W-phase coil is as follows: Figure 9 way to connect.

[0034] exist Figure 9 In the U-phase coil U1, in the radial direction of the cylindrical shape, the U-phase outer coil and the U-phase inner coil are structurally insulated, and the number of coils in each phase is multiple. Figure 9 The outer side of the middle is the U-phase outer coil, and the inner side is the U-phase inner coil.

[0035] The U-phase coil U1 and the cylindrical U-phase outer coil and the cylindrical U-phase inner coil are connected by wires at the lower end U105 and are insulated from each other in the radial direction.

[0036] Specifically, the U-phase outer coil of U1 on the U-phase coil has U103 installed on its extended portion, extending from the U-phase outer terminal U101 on the upper end side of the cylindrical shape toward the lower end of the cylindrical shape, all the way to the cylindrical axis. The U-phase inner coil of U1 on the U-phase coil has U104 installed on its extended portion, located radially inward of the U-phase outer coil. Its lower end is wired to the lower end of the U-phase outer coil and extends toward the upper end of the cylindrical shape, all the way to the cylindrical axis. At the upper end of the cylindrical shape, in the radial direction of the U-phase outer terminal U101, it terminates at U102 on the U-phase inner terminal located inside.

[0037] U1 on the U phase coil, U102 on the U phase inner terminal and Figure 1 Electric wires can be connected between U2 on the second U-phase coil in the circumferential direction and U202 on the U-phase outer terminal.

[0038] In this embodiment, the coil body is a coil for a three-phase rotating electric machine. The number of turns of the U-phase coil U1 is 5.

[0039] Figure 9 In the V-phase coil V1, an insulation structure is adopted between the V-phase outer coil and the V-phase inner coil in the radial direction of the cylindrical shape, and the number of coils for each phase is multiple coils. Figure 9 The outer side of the middle is the V-phase outer coil, and the inner side is the V-phase inner coil.

[0040] V1 on the V-phase coil is located between a cylindrical V-phase outer coil and a cylindrical V-phase inner coil connected by electric wires at the lower end side V105, and is insulated from each other in the radial direction.

[0041] Specifically, the V-phase outer coil (V1) of the V-phase coil has V103 installed on its extended portion, extending from the V-phase outer terminal (V101) at the upper end of the cylindrical shape toward the lower end of the cylindrical shape, all the way to the cylindrical axis. The V-phase inner coil (V1) of the V-phase coil has an extended portion located radially inward of the V-phase outer coil. It is wired to the lower end of the V-phase outer coil at its lower end and extends toward the upper end of the cylindrical shape, all the way to the cylindrical axis. At the upper end of the cylindrical shape, it terminates at V102, located radially inward of V101 on the V-phase outer terminal.

[0042] V1 on the V phase coil, V102 on the V phase inner terminal and Figure 1 The wire can be connected between the V202 on the V-phase inner terminal of the second V-phase coil in the circumferential direction. Figure 1An electrical connection can be made between the V-phase outer terminal V201 of the V-phase coil V2 located second in the circumferential direction.

[0043] In this embodiment, the coil body is a coil for a three-phase rotating electric machine. The number of turns of V1 on the V-phase coil is 5.

[0044] exist Figure 9 In the W-phase coil W1, an insulation structure is adopted between the W-phase outer coil and the W-phase inner coil in the radial direction of the cylindrical shape, and the number of coils for each phase is multiple coils. Figure 9 The outer side of the middle is the W-phase outer coil, and the inner side is the W-phase inner coil.

[0045] The W-phase coil W1 and the W-phase coil W105 are located between the cylindrical W-phase outer coil and the cylindrical W-phase inner coil connected by electric wires at the lower end side, and are insulated from each other in the radial direction.

[0046] Specifically, the W-phase outer coil W1 of the W-phase coil has a W103 attached to its extended portion, extending from the W-phase outer terminal W101 at the upper end of the cylindrical shape toward the lower end of the cylindrical shape, all the way to the cylindrical axis. The W-phase inner coil W1 of the W-phase coil has its extended portion located radially inward of the W-phase outer coil, with its lower end connected to the lower end of the W-phase outer coil and extending toward the upper end of the cylindrical shape, all the way to the cylindrical axis. At the upper end of the cylindrical shape, it terminates at the W-phase inner terminal W102, located radially inward of the W-phase outer terminal W101.

[0047] W1 on the W phase coil, W102 on the W phase inner terminal, and Figure 1 The wire can be connected between the W202 on the W-phase inner terminal of the second W-phase coil in the circumferential direction. Figure 1 An electrical connection can be made between the W-phase outer terminal W201 of the W-phase coil W2 that is second in the circumferential direction.

[0048] In this embodiment, the coil body is a coil for a three-phase rotating electric machine. The number of turns of W1 on the W-phase coil is 5.

[0049] For the coils in this embodiment, for example, for a U-phase coil, the U-phase inner terminal U102 on the upper end side of U1 and the U-phase inner terminal U201 on the upper end side of U2 on the next U-phase coil in the circumferential direction are connected by wires through the conductive inner connecting terminal 501.

[0050] Similarly, for one V-phase coil, the V-phase inner terminal V101 on the upper end side of V1 and the V-phase inner terminal V201 on the upper end side of V2 on the next V-phase coil in the circumferential direction are connected by wires via the conductive inner connection terminal 601 .

[0051] Thus, according to the conductive connection points of each component, the U-phase coil component and the next U-phase coil component in the circumferential direction, the V-phase coil component and the next V-phase coil component in the circumferential direction, and the W-phase coil component and the next W-phase coil component in the circumferential direction can all be electrically connected.

[0052] In this embodiment, the inner connection points 401, 501, and 601 all have the same structure and are made of conductive metal, such as copper. The outer connection points 400, 500, and 600 all have the same structure and are made of conductive metal, such as copper.

[0053] As in Figures 4 to 7 In the embodiment, the outer connection points 400, 500, 600 are all mounted on the outer circumference of the cylindrical coil body, and as shown in FIG. Figure 4 and Figure 5 As shown, in plan view, they all appear to be arc-shaped and circumferentially extended. Furthermore, by means of stepped portions 410, 510, and 610 formed in the middle of the circumference and appearing in plan view, the small-diameter arc-shaped components 402, 502, and 602 with a small radius of curvature are connected to the large-diameter arc-shaped components 403, 503, and 603 with a large radius of curvature. Subsequently, when assembled on the outer circumference of the cylindrical coil body, recessed components 406, 407, 506, 507, 606, and 607 are provided on the upper sides of the two ends extending to the arc shape.

[0054] The U-phase outer connector component at the upper end of the cylindrical coil body, the V-phase outer connector component at the upper end and the W-phase outer connector component at the upper end are bent and inserted by the recessed components 406, 407, 506, 507, 606 and 607, so the U-phase outer connector components, the V-phase outer connector components and the W-phase outer connector components assembled in sequence in the circumferential direction are all in a connected and energized state.

[0055] In this embodiment, electrical insulation is ensured on the radially inner and outer sides of the outer connection points 400, 500, and 600. For example, insulating coatings are formed on the radially inner and outer sides of the copper outer connection points 400, 500, and 600.

[0056] The inner connection points 401, 501, 601 are all mounted on the inner circumference of the cylindrical coil body, and as shown in FIG. Figure 4 and Figure 6As shown, in plan view, they all appear to be arc-shaped and circumferentially extended. Furthermore, by means of stepped portions 410, 510, and 610 formed in the middle of the circumference and appearing in plan view, the small-diameter arc-shaped components 404, 504, and 604 with a small radius of curvature are connected to the large-diameter arc-shaped components 405, 505, and 605 with a large radius of curvature. Subsequently, when the cylindrical coil body is assembled, recessed components 408, 409, 508, 509, 608, and 609 are provided on the upper sides of the ends extending to the arc shape.

[0057] The U-phase outer connector component at the upper end of the cylindrical coil body, the V-phase outer connector component at the upper end and the W-phase outer connector component at the upper end are bent and inserted by the recessed components 408, 409, 508, 509, 608 and 609, so the U-phase outer connector components, the V-phase outer connector components and the W-phase outer connector components assembled in sequence in the circumferential direction are all in a connected and energized state.

[0058] The radially inner and outer surfaces of the inner connection points 401 , 501 , and 601 must be electrically insulated. For example, insulating coatings must be formed on the radially inner and outer surfaces of the copper outer connection points 401 , 501 , and 601 .

[0059] Although Figure 7 Although not shown, the U-phase inner joint component and the U-phase outer joint component located at the upper end of the U-phase coil component composed of the U-phase inner coil component and the U-phase outer coil component, the V-phase inner joint component and the V-phase outer joint component located at the upper end of the V-phase coil component composed of the V-phase inner coil component and the V-phase outer coil component, and the W-phase inner joint component and the W-phase outer joint component located at the upper end of the W-phase coil component composed of the W-phase inner coil component and the W-phase outer coil component are sandwiched between the two, as shown in FIG. Figure 7 As shown, outer connection points 400 , 500 , 600 are mounted on the radial outside, and inner connection points 401 , 501 , 601 are mounted on the radial inside.

[0060] When following Figure 1 As shown, when the cylindrical coil body is assembled in the circumferential direction, the diameter of the circular surface formed by the large-diameter arc-shaped parts 403, 503, 603, etc. of the outer connection points 400, 500, 600, etc. is larger than the diameter of the circular surface formed by the large-diameter arc-shaped parts 405, 505, 605, etc. of the inner connection points 401, 501, 601, etc.

[0061] Similarly, when following Figure 1As shown, when the cylindrical coil body is assembled in the circumferential direction, the diameter of the circular surface formed by the small-diameter arc-shaped parts 402, 502, 602, etc. of the outer connection points 400, 500, 600, etc. is larger than the diameter of the circular surface formed by the small-diameter arc-shaped parts 404, 504, 604, etc. of the inner connection points 401, 501, 601, etc.

[0062] Since the outer connection points 400, 500, 600 are all constructed as described above, the outer periphery of the cylindrical coil body can be Figure 5 As shown, each component can be staggered and assembled circumferentially in the coil body. In other words, the radially outer side of the small-diameter arc-shaped component 502 at the outer connection point 500 can be circumferentially aligned with the radially inner side of the large-diameter arc-shaped component 403 of the outer connection point 400 connected to the previous position. The radially inner side of the large-diameter arc-shaped component 503 of the outer connection point 500 can be circumferentially aligned with the radially outer side of the small-diameter arc-shaped component 602 of the outer connection point 600 connected to the next position.

[0063] Since the components of the outer connection points 400, 500, 600 are all constructed as described above, they can be connected as shown in FIG. Figure 5 As shown, only when the outer connection points 400, 500, 600 are assembled on the outer periphery of the cylindrical coil body can the thickness of the coil body in the radial direction be controlled so as not to increase.

[0064] As Figure 5 and Figure 1 As shown, when the outer connection points 400, 500, 600 are assembled on the outer periphery of the coil body, the Figure 8 A connection point support member (outer support member) 3 made of synthetic resin shown in (b) is attached to the outer periphery of the coil body.

[0065] The U-phase outer connector U101 at the upper end of the U-phase coil unit U1 is bent and connected to the concave component 506 of the outer connection point 500. Meanwhile, the U-phase outer connector U201 at the upper end of the U-phase coil unit U2, located one position behind, is bent and connected circumferentially to the concave component 507 of the outer connection point 500. This allows the U-phase outer connector U101 at the upper end of the U-phase coil unit U1 to be electrically connected to the U-phase outer connector U201 at the upper end of the U-phase coil unit U2, located one position behind, using the conductive outer connection point 500.

[0066] The V-phase outer connector member V101 at the upper end of the V-phase coil portion V1 is bent and connected to the concave member 606 of the outer connection point 600. Meanwhile, the V-phase outer connector member V201 at the upper end of the V-phase coil portion V2, located one position behind, is bent and connected circumferentially to the concave member 607 of the outer connection point 600. This allows the V-phase outer connector member V101 at the upper end of the V-phase coil portion V1 to be electrically connected to the V-phase outer connector member V201 at the upper end of the V-phase coil portion V2, located one position behind, using the conductive outer connection point 600.

[0067] The W-phase outer connector component at the upper end of the W-phase coil portion W1 is bent and connected to the concave component 407 of the outer connection point 400. On the other hand, the W-phase outer connector component at the upper end of the W-phase coil component at the previous position is bent and connected circumferentially to the concave component 406 of the outer connection point 400. In this way, the W-phase outer connector component at the upper end of the W-phase coil component and the W-phase outer connector component at the upper end of the W-phase coil component at the circumferentially subsequent position can be electrically connected using the conductive outer connection point 400. Because the components of the inner connection points 401, 501, and 601 are all constructed as described above, the inner circumference of the cylindrical coil body can be connected as shown. Figure 6 As shown, each component can be staggered and assembled in the circumferential direction of the coil body. In other words, the radially outer side of the small-diameter arc-shaped component 504 at the inner connection point 501 can be circumferentially aligned with the radially inner side of the large-diameter arc-shaped component 405 connected to the inner connection point 401 at the previous position. The radially inner side of the large-diameter arc-shaped component 505 at the inner connection point 501 can be circumferentially aligned with the radially outer side of the small-diameter arc-shaped component 604 connected to the inner connection point 601 at the next position.

[0068] Since the inner connection points 401, 501, 601 are all constructed as described above, they can be Figure 6 As shown, only when the inner connection points 401 , 501 , 601 are assembled on the cylindrical coil body can the thickness of the coil body in the radial direction be controlled so as not to increase.

[0069] As Figure 6 and Figure 1 As shown, the inner connection points 401, 501, 601 are assembled on the outer periphery of the coil body.

[0070] Connect the inner side 401, 501, 601 as Figure 1 、 Figure 6 When installed on the inner ring of the coil body as shown, it can be installed Figure 8 (a) is performed after the synthetic resin material connecting support part (inner support part) 2.

[0071] The upper U-phase inner terminal portion U102 of the leading U-phase coil unit U1 is bent and inserted, then connected to the recess 508 of the inner connection 501. Meanwhile, the upper U-phase inner terminal portion U202 of the trailing U-phase coil unit U2 is bent and inserted, then connected to the recess 509 of the inner connection 501. In this way, the upper U-phase inner terminal portion U102 of the leading U-phase coil unit U1 and the upper U-phase inner terminal portion U202 of the circumferentially trailing U-phase coil unit U2 are electrically connected via the conductive inner connection 501.

[0072] The upper V-phase inner terminal V102 of the leading V-phase coil V1 is bent and inserted, then connected to the recess 608 of the inner connection 601. Meanwhile, the upper V-phase inner terminal U201 of the trailing V-phase coil V2 is bent and inserted, then connected to the recess 609 of the inner connection 601. In this way, the upper V-phase inner terminal V102 of the leading V-phase coil V2 and the upper V-phase inner terminal V202 of the circumferentially trailing V-phase coil V2 are electrically connected via the conductive outer connection 600.

[0073] The W-phase inner terminal at the top end of the W-phase coil at the leading end is bent and inserted, then connected to recess 409 of inner connection 401. Conversely, the W-phase inner terminal at the top end of the circumferentially preceding W-phase coil is bent and inserted, then connected to recess 408 of inner connection 401. In this way, the W-phase inner terminal at the top end of the W-phase coil at the leading end is electrically connected to the W-phase inner terminal at the top end of the circumferentially preceding W-phase coil via conductive inner connection 401.

[0074] In this embodiment, the U-phase coil portion constituting the U phase, the V-phase coil portion constituting the V phase, and the W-phase coil portion constituting the W phase are grouped together. In order to form a ring-shaped cylindrical body when viewed from above, the coil body for a coreless rotating electrical machine is sequentially arranged in the circumferential direction to form a cylindrical shape. According to this coil body, the U-phase coil portion at the head end and the U-phase coil portion at the end in the circumferential direction, the V-phase coil portion at the head end and the V-phase coil portion at the end in the circumferential direction, and the W-phase coil portion at the head end and the W-phase coil portion at the end in the circumferential direction are each electrically connected by conductive connections.

[0075] As a conductive connection, a material with high conductivity, such as copper, is used to allow large currents to flow.

[0076] Furthermore, by adopting the inner connection 401 and the outer connection 400 of the above-described structure, it is possible to produce a coil body that is compact and space-saving while suppressing the increase in radial dimension.

[0077] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A coil body suitable for an ironless rotating electrical machine, characterized in that: A U-phase coil portion constituting the U phase, a V-phase coil portion constituting the V phase, and a W-phase coil portion constituting the W phase constitute a coil group, and a plurality of said coil groups are sequentially connected on the same plane to form a ring-shaped cylindrical coil body; The U-phase coil portion at the head end of the cylindrical coil body is electrically connected to the U-phase coil portion at the end in the circumferential direction by conductive wiring; the U-phase constitutes a U-phase coil portion, a U-phase outer coil portion, and a U-phase inner coil portion; in the radial direction of the cylindrical coil body, an insulation structure is adopted between the U-phase outer coil portion and the U-phase inner coil portion, and the U-phase outer coil portion and the U-phase inner coil portion constitute a coil body with a plurality of turns per phase; The V-phase coil portion at the head end of the cylindrical coil body and the V-phase coil portion at the end in the circumferential direction are electrically connected via conductive wiring; the V-phase coil portion constituted by the V-phase outer coil portion and the V-phase inner coil portion; in the radial direction of the cylindrical coil body, the V-phase outer coil portion and the V-phase inner coil portion are insulated, and the V-phase outer coil portion and the V-phase inner coil portion constitute a coil body with a plurality of turns per phase; The W-phase coil portion at the head end of the cylindrical coil body and the W-phase coil portion at the end in the circumferential direction are electrically connected through conductive wiring; the W-phase coil portion of the W-phase, the W-phase outer coil portion and the W-phase inner coil portion; in the radial direction of the cylindrical coil body, an insulating structure is adopted between the W-phase outer coil portion and the W-phase inner coil portion, and the W-phase outer coil portion and the W-phase inner coil portion constitute a coil body with multiple turns for each phase.

2. The coil body suitable for an ironless rotating electrical machine according to claim 1, characterized in that: The wiring is provided on the cylindrical coil body and extends in an arc shape in the circumferential direction of the cylindrical coil body. A small-diameter arc-shaped portion with a small curvature radius and a large-diameter arc-shaped portion with a large curvature radius are connected by a stepped portion formed in the middle portion of the circumference. The radial inner side surface and the radial outer side surface of the cylindrical coil body have electrical insulation properties. The terminal portion of the U-phase coil portion, the terminal portion of the V-phase coil portion or the terminal portion of the W-phase coil portion is bent and inserted into the upper side of the arc-shaped extending two ends provided on the circumferential surface of the cylindrical coil body to form a cylindrical coil body having a recessed portion for electrical connection.

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