End portion fixing coil structure, rotary electric machine, end portion fixing coil structure forming method, end portion fixing coil structure forming device, end portion fixing coil structure forming jig, and rotary electric machine winding bobbin

Abstract

To provide a novel coil structure forming technique without securing extra space such as a winding space in an outer boundary and an inner peripheral side and a space between coils, accordingly preventing a device downsizing, and further increasing an operation time.SOLUTION: An end portion fixing coil structure 10 is a coil structure formed by winding a wire body 1 spirally a plurality of times. When the number of times of windings of the coil structure is made N, a fixing part 5 is formed in which (N-1)-th line 8 that is one time before line body presses from above and fixes the N-th line 9 that is the N-th line body which becomes an end portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an end-fixed coil structure, a rotating electric machine, an end-fixed coil structure forming method, an end-fixed coil structure forming device, an end-fixed coil structure forming jig, and a rotating electric machine winding bobbin, and in particular to a processing technology for preventing the wire at the end of the winding from unwinding when manufacturing a coil. [Background technology]

[0002] 11 is an explanatory perspective view showing the winding completion stage in the coil manufacturing process for a conventional rotating electric machine such as a motor. As shown in (i) in the figure, a coil structure 910 for a rotating electric machine is manufactured by winding a conductor (magnet wire) 91 around a bobbin (insulating cap) 920. However, if no special processing is performed on the end of the winding as shown in (ii), the position will not be fixed, resulting in unwound winding Z.

[0003] If the conductor wire is not secured, there is a risk that it will be pinched between components during the subsequent assembly process. This can cause the wire to break or the insulation coating to be damaged, which can lead to insulation breakdown or malfunction when current is applied to a motor, etc. Therefore, it is necessary to secure the position of the end of the winding of the wire. Conventional methods for securing the wire include providing a protrusion or groove on the bobbin and winding the wire, or attaching tape to secure the wire.

[0004] Patent applications have been filed for winding processing technologies for motors and the like. For example, Patent Document 1, listed below, discloses a technology for preventing peeling of the winding coating and wire breakage in a motor in which a core with multiple teeth and a commutator with multiple commutator segments are arranged with an axial gap between them. This technology is configured so that the winding start wire of each winding segment, which is attached to the terminal of one commutator segment and wound around a winding core including the corresponding teeth and then attached to the terminal of the secondary pole, has a stress relief section that passes through one end of the tooth adjacent to one side of the winding core within the gap, and a waste winding section that passes through the other end of the tooth on the opposite side of the stress relief section with respect to the coil segment. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-010548 A: "Rotor, motor, and rotor wiring method" Summary of the Invention [Problem to be solved by the invention]

[0006] As mentioned above, when manufacturing coils for rotating electrical machines, it is necessary to secure the conductor wire at the end of winding. However, when winding the conductor wire by providing protrusions or grooves on the bobbin, it is necessary to prepare space for placement on the outer or inner circumference, which hinders the miniaturization of the device. On the other hand, when securing the wire by attaching tape, there are problems such as the need to secure space between the coils and the increased time required for the attachment work. A method for processing the end of winding that does not involve these methods is required.

[0007] Therefore, the problem that the present invention aims to solve is to provide a new coil structure forming technology that eliminates the problems of the conventional technology, does not require the securing of extra space such as winding space on the outer or inner periphery or space between coils, therefore does not hinder the miniaturization of the device, and furthermore, can fix the wire at the end of winding without increasing the working time. [Means for solving the problem]

[0008] After studying the above-mentioned problems, the inventors of the present application came up with the following method. That is, if the number of turns of the coil is N, the conductor wire is first wound in close contact with the coil as usual, but for the N-1th turn, a jig is inserted into the track and the wire is wound through the top of the jig. For the last Nth turn, the wire is wound through a groove in the jig. Then, the jig is moved to the outside of the coil, and the Nth conductor wire is passed under the N-1th conductor wire movement line. In this way, the Nth conductor wire is fixed in place by the N-1th conductor wire, preventing it from unwinding.

[0009] The inventors discovered that this method can solve the problems, and based on this, they have completed the present invention. That is, the invention claimed in this patent application, or at least the invention disclosed therein, as a means for solving the above problems is as follows.

[0010] [1] An end-fixed coil structure, characterized in that a coil structure is formed by winding a wire body multiple times in a spiral, and where the number of windings of the coil structure is N, the Nth wire body part, which is the end, is pressed down and fixed from above by the N-1th wire body part, which is the wire body part one turn before that. [2] The end fixed coil structure according to [1], characterized in that the Nth wire has a bent portion, and the fixed portion is formed in a form in which the N-1th wire is placed on top of the bent portion. [3] The end-fixed coil structure according to either [1] or [2], characterized in that the wire body is a metal wire. [4] The end-fixed coil structure according to [3], which constitutes a winding of a rotating electrical machine. [5] A rotating electric machine comprising the end fixed coil structure described in [3].

[0011] [6] A method for forming a coil structure by winding a wire body spirally around a winding target multiple times, comprising: a normal winding process in which, where N is the number of windings of the coil structure, the wire body is tightly wound around the winding target up to the N-2th turn, which is the N-2th turn of the wire body; a gap winding process in which the N-1th turn of the wire body, which is the N-1th turn of the wire body, is wound with a gap of at least the diameter of the wire body between it and the N-2th turn of the wire body; a detour portion forming process in which, when winding the Nth turn of the wire, which is the Nth turn of the wire body, the Nth turn of the wire body is passed through the gap to form a detour portion on the opposite side of the N-1th turn of the wire body; and an end fixing process in which, while maintaining the position of the detour portion, the Nth turn of the wire body is tensioned, thereby pressing down and fixing the detour portion from above with the N-1th turn of the wire to form a fixed portion. [7] The method for forming an end-fixed coil structure according to [6], characterized in that a gap forming jig is used in the gap winding process to form the gap by being interposed between the wire body of the N-2th or earlier wire and the wire body of the N-1th wire. [8] The method for forming an end-fixed coil structure according to [7], characterized in that, in order to form the detour portion in the detour portion forming process, the gap forming jig is provided with a guide portion that captures the Nth wire midway and guides it to the opposite side across the N-1th wire.

[0012] [9] The method for forming an end fixed coil structure described in [8], characterized in that in the end fixing process, in addition to the tensioning action, a release action is also performed to release the capture of the Nth wire by the guide portion of the gap forming jig.

[10] The method for forming an end-fixed coil structure according to any one of [6], [7], [8], and [9], characterized in that the wire body is a metal wire, the winding target is a bobbin, and the end-fixed coil structure is a winding of a rotating electrical machine.

[11] An apparatus for forming a coil structure by winding a wire body spirally around a winding target multiple times, comprising: a normal winding processing section that tightly winds the wire body up to the N-2th winding, which is the N-2th winding of the wire body portion, where N is the number of windings of the coil structure; a gap winding processing section that winds the N-1th winding, which is the N-1st winding of the wire body portion, with a gap of at least the diameter of the wire body between the N-1th winding and the wire body before the N-2th winding; a detour portion forming processing section that, when winding the Nth winding, which is the Nth winding of the wire body portion, passes the Nth winding through the gap to form a detour portion on the opposite side of the N-1th winding; and an end fixing processing section that tensions the Nth winding while maintaining the position of the detour portion, thereby pressing down and fixing the detour portion from above at the N-1th winding, thereby forming a fixed portion.

[12] The end-fixed coil structure forming device according to

[11] , characterized in that the wire body is a metal wire, the winding target is a bobbin, and the end-fixed coil structure is a winding of a rotating electrical machine.

[0013]

[13] A jig for forming the end-fixed coil structure described in [1], characterized in that a guide portion is provided between the wire body of the N-1th turn and the wire body of the N-2th turn, which is the wire body portion wound one turn before the N-1th turn, to form a gap larger than the diameter of the wire bodies, and to capture the Nth turn wire midway and guide it to the opposite side of the N-1th turn wire.

[14] The jig for forming an end-fixed coil structure according to

[13] , characterized in that it is cylindrical and the guiding portion is a groove formed around the side surface.

[15] A bobbin for winding a rotating electric machine having a shape that is compatible with the end-fixed coil structure forming jig described in either

[13] or

[14] , characterized in that it comprises a core portion around which the wire that forms the winding is wound and two side plate portions provided on both sides of the core portion, one of the side plate portions having a notch of a shape that is compatible with the cross-sectional shape of the end-fixed coil structure forming jig.

[16] A rotating electric machine comprising a winding using the rotating electric machine winding bobbin according to

[15] . [Effects of the Invention]

[0014] The end-fixed coil structure, rotating electric machine, end-fixed coil structure forming method, end-fixed coil structure forming device, end-fixed coil structure forming jig, and rotating electric machine winding bobbin of the present invention are configured as described above, and therefore, when manufacturing coils for rotating electric machines such as motors, it is not necessary to reserve extra space such as winding space on the outer or inner circumference or space between coils, and therefore it is possible to fix the end of the wound wire without hindering the miniaturization of the device or increasing the working time.

[0015] In other words, the method of the present invention easily and securely fastens the coil's conductor end, reducing the risk of the conductor getting caught between components in later processes and improving workability. Furthermore, since the conductor is fastened within the coil, it does not affect radial space. In particular, since the conductor is fastened by the conductor itself, the number of components that make up a rotating electrical machine such as a motor does not increase.

[0016] In this way, the present invention is highly useful and contributes to improving the productivity of rotating electrical machines such as servo motors. Note that the method of the present invention can be widely applied not only to rotating electrical machines but also to the formation of coil structures in any object having a coil structure, particularly in the processing of the end of winding. [Brief explanation of the drawings]

[0017] [Figure 1] 1A and 1B are explanatory diagrams showing a basic configuration example of an end-fixed coil structure of the present invention in a plan view and a front view as seen from the arrow Fv in (x). [Figure 2] 1A and 1B are explanatory diagrams showing a basic configuration example of an end fixed coil structure of the present invention that constitutes a winding of a rotating electric machine, in a plan view and a front view taken along an arrow Fv in (x). [Figure 3] 1 is a flow chart showing the basic configuration of a method for forming an end-fixed coil structure according to the present invention; [Figure 4] 1 is a perspective explanatory view showing an example of the configuration of a jig that can be used in the method for forming an end-fixed coil structure of the present invention. FIG. [Figure 5] 1 is a perspective explanatory view showing an example of the structure of a bobbin for a rotating electrical machine winding that can be wound in the end fixed coil structure forming method of the present invention; FIG. [Figure 6] 1 is an explanatory diagram (part 1) showing a specific example of a process of the method for forming an end fixed coil structure of the present invention for forming a winding for a rotating electric machine. [Figure 7] 10 is an explanatory diagram (part 2) showing a specific example of the process of the method for forming an end fixed coil structure of the present invention for forming a winding for a rotating electric machine. [Figure 8]10 is an explanatory diagram (part 3) showing a specific example of the process of the method for forming an end fixed coil structure of the present invention for forming a winding for a rotating electric machine. [Figure 9] 10 is an explanatory diagram (part 4) showing a specific example of the process of the method for forming an end fixed coil structure of the present invention for forming a winding for a rotating electric machine. [Figure 10] 1 is a conceptual diagram showing the basic configuration of an end-fixed coil structure forming device according to the present invention. [Figure 11] FIG. 10 is a perspective explanatory view showing the stage of winding completion in the conventional coil manufacturing process for a rotating electric machine such as a motor. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention will be described in detail below with reference to the drawings. 1 is an explanatory diagram showing an example of the basic configuration of an end-fixed coil structure of the present invention in a plan view ((x) in the figure) and a front view ((y) in the figure) as viewed from the arrow Fv in (x). As shown in the figure, this end-fixed coil structure 10 is a coil structure formed by winding a wire body 1 multiple times in a spiral shape, and its main configuration is that, where the number of windings of the coil structure is N, an Nth wire body portion, which is the Nth winding and forms the end, is pressed down from above and fixed by an N-1th wire body portion, which is the previous winding.

[0019] In the end-fixed coil structure 10 of the present invention configured as described above, the Nth wire 9, which forms the end of the wound wire body 1, is pressed down from above by the (N-1)th wire 8, which is the wire body portion of the previous winding, to form the fixed portion 5, thereby fixing the end of the winding of the wire body 1 and reliably preventing unwinding. Because the wire body 1 is fixed by itself, there is no need to secure extra space or increase the number of parts.

[0020] 1, this end-fixed coil structure 10 is characterized in that the Nth wire 9 has a bent portion 3, and the N-1th wire 8 is placed on top of that to form the fixed portion 5. The bent portion 3 has two areas that are not parallel to the winding direction of the wire body 1 but intersect with it, and the N-1th wire 8 is placed on top of these two areas, pressing down and fixing the two areas, thereby fixing the Nth wire 9, which is the end of the winding of the wire body 1. In other words, the fixed portion 5 is formed by the bent portion 3.

[0021] The type of wire that can be used in the end-fixed coil structure of the present invention is not limited as long as it forms a coil structure. However, in particular, wires having hardness at least as hard as metal wire can be used, so that the wire can be stably fixed at a fixed location without being displaced by other locations on the same wire. In the following explanation, the present invention will be described mainly with reference to end-fixed coil structures using such metal wire, particularly end-fixed coil structures that form windings for rotating electrical machines.

[0022] 2 is an explanatory diagram showing a plan view and a front view as viewed from the arrow Fv in (x) illustrating an example of the basic configuration of an end-fixed coil structure of the present invention that constitutes the winding of a rotating electric machine. As shown in the figure, the end-fixed coil structure 110 of the present invention can be used in a form in which the wire 11 is wound around a bobbin 20, i.e., as a winding for a rotating electric machine. This eliminates the need to secure extra space, as in conventional technology, when fixing the conductor at the end of winding in the production of a coil for a rotating electric machine, which is advantageous for miniaturizing the device and improving work efficiency. Note that rotating electric machines such as AC servo motors equipped with such an end-fixed coil structure 110 are also within the scope of the present invention.

[0023] 3 is a flow diagram showing the basic configuration of the method for forming an end-fixed coil structure of the present invention. As shown in the figure, this method for forming an end-fixed coil structure basically comprises a normal winding process P10 in which the wire is tightly wound around the winding target up to the N-2th turn, which is the N-2th turn of the wire, where N is the number of turns of the coil structure; a gap winding process P20 in which the N-1th turn is wound with a gap equal to or larger than the diameter of the wire between the N-1th turn and the wire up to the N-2th turn; a detour portion forming process P30 in which, when winding the Nth turn, the Nth turn is passed through the gap to form a detour portion on the opposite side of the N-1th turn; and an end fixing process P40 in which, while maintaining the position of the detour portion, the Nth turn is tensioned, thereby pressing down and fixing the detour portion from above at the N-1th turn, to form a fixed portion.

[0024] In this method of forming an end-fixed coil structure having such a configuration, first, in the normal winding process P10, the wire up to the N-2th wire, which is the N-2th wire portion, is tightly wound around the winding target, then, in the gap winding process P20, the N-1th wire is wound with a gap of at least the diameter of the wire between it and the wire up to the N-2th wire, and then, in the detour portion forming process P30, the Nth wire is wound with the Nth wire passing partway through the gap to form a detour portion on the opposite side of the N-1th wire.

[0025] Then, in end fixing process P40, the Nth wire is tensioned while maintaining the position of the detour portion, whereby the detour portion is pressed down and fixed from above by the N-1th wire to form a fixed portion, and a coil structure is formed in which the wire body is wound spirally multiple times around the winding target. In this way, by this end-fixed coil structure forming method, the end-of-winding wire is pressed down and fixed by the wire body one turn before the end of the winding, and a process is performed to prevent the end-of-winding wire from unraveling, and end-fixed coil structure 10 is formed.

[0026] 4 is a perspective explanatory diagram showing an example of the configuration of a jig that can be used in the method for forming an end-fixed coil structure of the present invention. As shown in the figure, this gap forming jig 40 is a jig that is interposed between the wire body before the N-2nd turn and the wire body of the N-1st turn in the gap winding process P20 to form a gap. In the gap winding process P20 in the flow shown in FIG. 3 above, the gap forming jig 40 is sandwiched between the wire body before the N-2th turn and the wire body of the N-1st turn, thereby forming the necessary gap, and the process continues to the subsequent detour portion forming process P30.

[0027] The gap forming jig 40 is a tool that clamps wire bodies to form gaps between them, and can be any object with a diameter or height sufficient to form a gap larger than the diameter of the wire bodies. However, to smoothly proceed with the gap winding process P20, a diameter and height sufficient to exceed the diameter of the wire bodies is desirable. Furthermore, a rod-like shape is sufficient, and a rectangular prism shape, for example, is not excluded. However, when the end-fixed coil structure forming method of the present invention is used to form coil windings for rotating electrical machines, a cylindrical shape is best, taking into account the load on the conductor wire.

[0028] As shown in the figure, the gap forming jig 40 can be structured to include a guide portion 44 that catches the Nth line midway and guides it to the opposite side across the N-1th line, in order to facilitate and smooth the formation of the detour portion in the detour portion forming process P30. A groove as shown in the figure is sufficient as a specific form of the guide portion 44.

[0029] The gap forming jig 40, which is interposed between the wire body before the N-2th wire and the wire body of the N-1th wire in the gap winding process P20 to form a gap, has its guide portion 44 catch the middle of the Nth wire and guide it to the opposite side of the N-1th wire in the subsequent detour portion forming process P30, making the detour portion formation easy and smooth.

[0030] The gap forming jig 40 shown in Figure 4 is a convenient jig for easily and smoothly forming the end-fixed coil structure of the present invention, and this jig is also within the scope of the present invention. That is, it is a jig that is interposed between the wire bodies of the N-1th and N-2nd wires to form a gap larger than the diameter of the wire bodies, and is equipped with a guide member that captures the Nth wire midway and guides it to the opposite side of the N-1th wire. This jig 40 can be particularly cylindrical, and the guide member 44 can be a groove formed around the side surface.

[0031] Furthermore, in the end fixing process P40 in the flow shown in Figure 3 above, in addition to the tensioning action, a release action is also performed to release the capture of the Nth wire by the guide portion 44 of the gap forming jig 40, thereby completing the formation of the end fixed coil structure.

[0032] 5 is an explanatory perspective view showing an example of the structure of a bobbin for a rotating electric machine winding that can be wound using the end-fixed coil structure forming method of the present invention. When this end-fixed coil structure forming method is used to form windings for a rotating electric machine, the winding target is a bobbin, and as shown in the figure, the bobbin 20 can be configured with a notch 26 into which a gap forming jig (end-fixed coil structure forming jig) 40 can be placed to make the gap winding process P20, the detour portion forming process P30, and the end fixing process P40 easier and smoother.

[0033] With this configuration, a gap forming jig (end-fixed coil structure forming jig) 40 can be placed in the notch 26 of the bobbin 20 during each of the gap winding process P20, detour portion forming process P30, and end fixing process P40 of the end-fixed coil structure forming method, allowing each process to proceed in a stable state. It is desirable that the shape of the notch 26 be the same as that of the gap forming jig (end-fixed coil structure forming jig) 40, as this allows the jig to be maintained in a stable placed state. It is preferable to use the gap forming jig (end-fixed coil structure forming jig) 40 close to the coil, and the notch 26 fully meets this requirement.

[0034] To explain the illustrated bobbin 20 in more detail, it has a core 20C around which the wire forming the winding is wound, two side plates 20S, 20S provided on both sides of the core 20C, and one of the side plates 20S is provided with a notch 26 whose shape matches the cross-sectional shape of the end-fixed coil structure forming jig 40. Such a rotating electric machine winding bobbin 20 having a shape that matches the end-fixed coil structure forming jig 40 also falls within the scope of the present invention.

[0035] Incidentally, a rotating electric machine provided with a winding using the rotating electric machine winding bobbin 20 is also within the scope of the present invention.

[0036] Fig. 6 is an explanatory diagram (part 1) showing a specific example of the process of the method for forming an end-fixed coil structure of the present invention for forming windings for a rotating electrical machine. Fig. 7 is an explanatory diagram (part 2), Fig. 8 is an explanatory diagram (part 3), and Fig. 9 is an explanatory diagram (part 4), with (a)-(b), (c)-(d), (e)-(f), and (g) shown in order throughout each figure. In (a)-(g), the upper part shows a plan view, and the lower part shows a front view of the main part as seen by the arrow Fv in the plan view of (a). In the following explanation, the number of turns of the coil is assumed to be N [turns]. First, the conductor wire 11 is wound in the 1st to (N-2th) turns so as to be in close contact with the bobbin 20 as in the conventional method (FIG. 6(a)).

[0037] Next, the gap forming jig 40 is inserted from the groove 26 of the bobbin 20 in the insertion direction S (FIG. 6(b)), and the conductor wire is passed over the top of the jig 40 and wound the N-1th turn 18, but at this time, the conductor wire is wound around a portion of the jig 40 that is not the guide portion 46, i.e., the front portion 47 (FIG. 7(c)). The positional relationship between the front portion 47 and the guide portion 46 of the gap forming jig 40 is such that the guide portion 46 is closer to the tip in the insertion direction S, and the front portion 47 is behind the guide portion 46.

[0038] Next, the Nth winding of the wire 19 is performed by passing the conductor through the guide portion 46 of the jig 40 and winding the wire while being captured by the guide portion 46 (FIG. 7(d)). In other words, the N-1th winding of the wire 18 is wound further rearward in the insertion direction S of the jig 40, and the Nth winding of the wire 19 passing through the guide portion 46 is wound further forward.

[0039] Next, while applying tension in the tension direction T to the conductor end of the Nth wire 19, which is the end of winding, the jig 40 is pulled out in the direction U opposite to the insertion direction S, so as to return to the outside of the bobbin 20 before insertion (FIG. 8(e)). As a result, the portion of the Nth wire 19 that is caught and held by the guiding portion 46 passes under the N-1th wire 18 while still being held there, and is pulled out to the opposite side (outside the bobbin 20), forming a bent portion 13 in the Nth wire.

[0040] As the jig 40 is pulled out, the N-1th wire 18 resting on its front portion 47 is tightened under tension in the tension direction T, and at the same time, the jig 40 is made to stand upright in the upright direction V with the tip in the insertion direction S as the base point, so that the N-1th wire 18 presses down on the Nth wire 19 from above and fixes it (FIG. 8(f)). In this way, the fixed portion 15 is formed with the N-1th wire 18 resting on the bent portion 13.

[0041] After the fixed portion 15 is formed, the Nth wire 19 is released from the gap forming jig 40, which is now in an upright position, and the jig 40 is removed in the removal direction W through the groove 26, completing the process of forming the end-fixed coil structure 110 (Figure 9(g)).

[0042] 10 is a conceptual diagram showing the basic configuration of an end-fixed coil structure forming apparatus of the present invention. The illustrated end-fixed coil structure forming apparatus 1000 is an apparatus for forming a coil structure by winding a wire body spirally multiple times around a winding target. The apparatus mainly comprises: a normal winding processing section 100 that tightly winds the wire body up to the N-2th winding, which is the N-2th winding of the wire body, where N is the number of windings of the coil structure; a gap winding processing section 200 that winds the N-1th winding, which is the N-1st winding of the wire body, with a gap equal to or larger than the diameter of the wire body between the N-1th winding and the wire body up to the N-2th winding; a detour portion forming processing section 300 that slips the Nth winding, which is the Nth winding of the Nth winding, into the gap to form a detour portion on the opposite side of the N-1th winding; and an end-fixing processing section 400 that tensions the Nth winding while maintaining the position of the detour portion, thereby pressing down and fixing the detour portion from above at the N-1th winding, to form a fixed portion.

[0043] When using the end fixed coil structure forming device 1000 with this configuration, in the normal winding processing unit 100, the wire body up to the N-2th winding is tightly wound around the winding target, in the gap winding processing unit 200, the N-1th winding is performed with a gap larger than the diameter of the wire body between it and the wire body up to the N-2th winding, in the detour portion forming processing unit 300, when winding the Nth winding, the Nth winding is made by slipping partway through the gap to form a detour portion on the opposite side of the N-1th winding, and in the end fixing processing unit 400, the Nth winding is made taut while maintaining the position of the detour portion, whereby the detour portion is pressed down and fixed from above by the N-1th winding to form a fixed portion, and a coil structure is formed in which the wire body is wound spirally multiple times around the winding target.

[0044] The present end-fixed coil structure forming apparatus 1000 can be suitably used for forming windings for a rotating electrical machine. That is, the end-fixed coil structure forming apparatus uses a metal wire as the wire body and winds the wire body around a bobbin. [Industrial Applicability]

[0045] According to the end-fixed coil structure and rotating electric machine of the present invention, coils for rotating electric machines such as motors can be manufactured without requiring extra space, without hindering the miniaturization of the device, and without increasing the working time. Furthermore, the risk of conductors getting caught between parts is reduced, workability is improved, and no additional parts for end fixing are required. Therefore, This invention has high industrial applicability in the field of rotating electrical machines, including AC servo motors, and in all related fields. Furthermore, the invention is not limited to rotating electrical machines, and can also be applied to the formation of coil structures in any object having a coil structure. [Explanation of symbols]

[0046] 1, 11... Wire body (or conductor) 3, 13...Bend 5, 15...Fixed part 8th, 18th...N-1st round 9th, 19th...Nth line 10, 110... Fixed end coil structure 20...Bobbin 20C…core part 20S…Side plate part 26...Notch (groove) 27...Front of the ditch 40... Gap forming jig (end fixed coil structure forming jig) 44...Guide area 100...Normal winding processing section 200...Gap winding processing part 300... Detour forming processing section 400...End fixing processing section 1000...End fixed coil structure forming device P10...Normal winding process P20...Gap winding process P30…Detour part formation process P40…End fixing process S...Insertion direction T...Tension direction U: Opposite direction to insertion direction (pull-out direction) V…Upright direction W: Detachment direction 91...Conducting wire (magnet wire) 910...Coil structure 920...Bobbin (insulating cap) Z...spill

Claims

1. A coil structure in which a wire body is wound spirally multiple times, When the number of turns of the coil structure is N, The Nth line, which is the Nth line body part that becomes the end, The N-1th wire, which is the previous wire part, is pressed down from above and fixed in place. An end-fixed coil structure.

2. The end fixed coil structure according to claim 1, wherein the Nth wire has a bent portion, and the fixed portion is formed in a form in which the N-1th wire is placed on the bent portion.

3. 3. The end-fixed coil structure according to claim 1, wherein the wire body is a metal wire.

4. 4. The end-fixed coil structure according to claim 3, which constitutes a winding of a rotating electrical machine.

5. A rotating electric machine comprising the end fixed coil structure according to claim 3.

6. A method for forming a coil structure by winding a wire around a target in a spiral shape multiple times, comprising the steps of: Let N be the number of turns of the coil structure, a normal winding process in which the wire is tightly wound around the winding target up to the N-2th winding, which is the N-2th winding of the wire; a gap winding process in which the N-1th winding of the wire, which is the N-1th winding of the wire body portion, is performed with a gap of at least the diameter of the wire body between the N-2th winding and the previous winding of the wire body; a detour forming process in which, when winding the Nth wire, which is the Nth wire body portion, the Nth wire is passed through the gap in the middle to form a detour on the opposite side of the N-1th wire; An end fixing process in which the Nth line is tensioned while maintaining the position of the detour portion, thereby pressing and fixing the detour portion from above with the N-1th line to form a fixed portion; 10. A method for forming an end-fixed coil structure, comprising:

7. 7. The method for forming an end-fixed coil structure according to claim 6, wherein a gap forming jig is used in the gap winding process to form the gap by interposing it between the wire body before the N-2th wire and the wire body of the N-1th wire.

8. 8. The method for forming an end-fixed coil structure according to claim 7, wherein the gap forming jig is provided with a guide portion that captures the Nth wire midway and guides it to the opposite side across the N-1th wire, in order to form the detour portion during the detour portion forming process.

9. 9. The method for forming an end fixed coil structure according to claim 8, characterized in that in the end fixing process, in addition to the tensioning action, a release action is also performed to release the capture of the Nth wire by the guide portion of the gap forming jig.

10. 10. The method for forming an end-fixed coil structure according to claim 6, wherein the wire body is a metal wire, the winding target is a bobbin, and the end-fixed coil structure is a winding of a rotating electrical machine.

11. An apparatus for forming a coil structure by winding a wire around a target in a spiral shape multiple times, Let N be the number of turns of the coil structure, a normal winding processing section that tightly winds the wire up to the N-2th wire, which is the N-2th wire portion, around the winding target; a gap winding processing section that winds the N-1th wire portion, which is the N-1th wire portion, with a gap of at least the diameter of the wire between the N-2th wire portion and the previous wire portion; a detour portion forming processing section that, when winding the N-th wire, which is the N-th wire body portion, passes the N-th wire through the gap in the middle to form a detour portion on the opposite side of the N-1-th wire; an end fixing processing portion that forms a fixing portion by pressing and fixing the detour portion from above at the (N-1)th line by tensioning the Nth line while maintaining the position of the detour portion; An end-fixed coil structure forming device comprising:

12. 12. The end-fixed coil structure forming device according to claim 11, wherein the wire body is a metal wire, the winding target is a bobbin, and the end-fixed coil structure is a winding of a rotating electrical machine.

13. A jig for forming the end-fixed coil structure according to claim 1, The N-1th line body; The wire is wound one turn before the N-1th turn, and is interposed between the wire and the N-2th turn, forming a gap larger than the diameter of the wire, and A guide portion is provided that captures the Nth line midway and guides it to the opposite side across the N-1th line. A jig for forming an end-fixed coil structure, characterized in that:

14. 14. The jig for forming an end-fixed coil structure according to claim 13, wherein the jig is cylindrical, and the guiding portion is a groove formed around the side surface.

15. A bobbin for winding a rotating electric machine having a shape that is compatible with the end-fixed coil structure forming jig according to claim 13 or 14, a core around which a wire forming a winding is wound; and two side plate portions provided on both sides of the core portion, One of the side plates has a notch formed in a shape that matches the cross-sectional shape of the end fixing coil structure forming jig. A bobbin for a rotating electric machine winding, characterized in that:

16. A rotating electric machine comprising a winding using the bobbin for a rotating electric machine winding according to claim 15.

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