Rotating electrical machine

Abstract

The present invention provides a rotary motor that is easy to manufacture and can be miniaturized. A rotary motor has a crank portion (219) disposed at the top of the coil end (213) that is radially displaced along the armature core (11), a first coil conductor portion (211) and the crank portion (219) are connected by a first inclined side portion (217) that is inclined relative to the axial end face of the armature core, and a second coil conductor portion (212) and the crank portion (219) are connected by a second inclined side portion (218) that is inclined relative to the axial end face of the armature core (11), at least one of the first inclined side portion (217) and the second inclined side portion (218) has an inflection point (A, B) before being connected to the crank portion (219), the inflection point (A, B) serving as the base point of a bend portion that bends radially outward toward the armature core.

Description

Technical Field

[0001] This application relates to rotating electrical machines. Background Technology

[0002] For rotating electrical machines such as electric motors and generators, small size and high output are generally required. In rotating electrical machines, the coil ends that connect the coils inserted into the slots of the stator core do not participate in the operation of the rotating machine electromagnetically. Therefore, minimizing these coil ends is crucial for miniaturizing the rotating machine. In miniaturizing these coil ends, conventional methods, such as those disclosed in Patent Documents 1 and 2, involve providing a crank at the top of the coil end to displace the coils inserted into the slots relative to each other radially along the rotating machine, thereby increasing the coil end density and achieving miniaturization. Existing technical documents Patent documents

[0003] Patent Document 1: WO2020 / 240762 Patent Document 2: WO2018 / 003461 Summary of the Invention The technical problem that the invention aims to solve

[0004] Patent Document 1 discloses that the coil end of the armature in a conventional rotary electric motor requires three-dimensional molding for manufacturing, which complicates the mold structure and manufacturing method, making product management and quality assurance difficult. Furthermore, Patent Document 2 discloses that the coil end of the armature in a conventional rotary electric motor has a crank (bent portion) at its beveled edge; however, the crank's forming is complex, and the bends are dense, causing significant damage to the coating on the conductors and potentially leading to poor insulation at the coil end.

[0005] This application discloses a technology for solving the above-mentioned problems, the purpose of which is to provide a rotary motor that is easy to manufacture and can be miniaturized. Technical means for solving technical problems

[0006] The rotary electric motor disclosed in this application includes: An armature core having a plurality of teeth arranged in a ring and a ring-shaped magnetic yoke connecting the plurality of teeth; An armature coil, which is mounted on the armature core; and The rotor has excitation poles, and its outer peripheral surface faces the inner peripheral surface of the armature core through a gap. The armature coil is composed of multiple armature coil units with a rectangular cross-section. The armature coil unit has: A first coil conductor portion and a second coil conductor portion are received at a predetermined spacing in slots formed between adjacent teeth; and The coil end, which connects the first coil conductor portion and the second coil conductor portion, is disposed at the axial end of the armature core. The coil end has: A crank portion is disposed at the top of the coil end and is displaced radially along the armature core; A first inclined portion, which connects the first coil conductor portion and the crank portion, and is inclined relative to the axial end face of the armature core; and The second inclined portion, which connects the second coil conductor portion and the crank portion, is inclined relative to the axial end face of the armature core. At least one of the first inclined portion and the second inclined portion has an inflection point during the process before being connected to the crank portion, which serves as the base point of the bend portion that bends radially outward toward the armature core. Invention Effects

[0007] According to the rotary motor disclosed in this application, a rotary motor that is easy to manufacture and can be miniaturized can be obtained. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the rotary electric motor involved in Embodiment 1. Figure 2 This is a perspective view of the armature in the rotary motor of Embodiment 1. Figure 3 This is a perspective view of a single armature coil in the rotary electric motor of Embodiment 1. Figure 4 This is a schematic diagram of the coil end of an armature coil unit viewed from a direction orthogonal to the axis of the rotating electric motor in Embodiment 1. Figure 5 This is an explanatory diagram showing the coil end of an armature coil unit viewed from the axial direction of the rotating electric motor in Embodiment 1. Figure 6 This is a schematic diagram illustrating the manufacturing method of the armature coil unit in the rotary electric machine according to Embodiment 1. Figure 7 This is a schematic diagram illustrating the manufacturing method of the armature coil unit in the rotary electric machine according to Embodiment 1. Figure 8 This is a schematic diagram illustrating the manufacturing method of the armature coil unit in the rotary electric machine according to Embodiment 1. Figure 9This is a schematic diagram illustrating the manufacturing method of the armature coil unit in the rotary electric machine according to Embodiment 1. Figure 10 This is a schematic diagram illustrating the manufacturing method of the armature coil unit in the rotary electric machine according to Embodiment 1. Figure 11 This is a perspective view illustrating the manufacturing method of the armature coil in the rotary electric machine according to Embodiment 1. Figure 12A This is a schematic diagram showing the coil end of the armature coil in the rotary electric machine of Embodiment 1. Figure 12B This is an explanatory diagram illustrating the coil end of the armature coil in the rotary electric machine of Embodiment 1. Figure 13 This is a perspective view of the armature in the rotary motor of Embodiment 2. Figure 14 This is a perspective view of the armature coil in the rotary motor of Embodiment 2. Figure 15 This is a schematic diagram of the coil end of an armature coil unit viewed from a direction orthogonal to the axis of the rotating motor in Embodiment 2. Figure 16 This is an explanatory diagram showing the coil end of the armature coil unit viewed from the axial direction of the rotating electric motor in Embodiment 2. Detailed Implementation

[0009] Implementation method 1. Hereinafter, the rotary electric motor of Embodiment 1 of this application and the method for manufacturing the rotary electric motor will be described with reference to the accompanying drawings. Figure 1 This is a schematic diagram of the rotary electric motor according to Embodiment 1. Figure 1 In this embodiment, the rotary motor 100 has a housing 110 consisting of a metal frame 102 and a metal end plate 103. The frame 102 is formed as a bottomed cylinder, with one axial end blocked by a bottom 1021 and the other axial end open. An annular flange 1022 is formed at the other axial end of the frame 102, protruding radially outward from the frame 102. A first bearing retainer 1023 is provided at the radial center of the bottom 1021 of the frame 102.

[0010] The end plate 103 includes an annular protrusion 1031 projecting axially from one end face, and a second bearing retainer 1032 formed at the radial center. In the end plate 103, the annular protrusion 1031 is inserted into the opening of the frame 102, and the peripheral portion of the end plate 103 abuts against the axial end face of the flange 1022 and is fixed to the frame 102. The other axial end of the open frame 102 is blocked by the end plate 103 fixed to the frame 102. The outer peripheral surface of the annular protrusion 1031 abuts against the inner peripheral surface of the frame 102.

[0011] The armature 10, serving as the stator, includes: an armature core 11, which has multiple electromagnetic steel plates stacked axially and is configured as a hollow cylinder; and an armature coil 2, which is inserted into multiple slots with openings on the inner circumferential side of the armature core 11. The armature core 11 is fitted into the inner circumferential surface of the frame 102 and fixed to the frame 102.

[0012] The rotor 105 includes a rotor shaft 106, a rotor core 107 fixed to the rotor shaft 106, and a plurality of permanent magnets 108 fixed to the rotor core 107. The plurality of permanent magnets 108 are embedded at a predetermined interval along the circumference of the rotor core 107 on the outer peripheral surface of the rotor core 107 and form excitation poles.

[0013] One axial end of the rotor shaft 106 is supported by a first bearing 1041 held by a first bearing retainer 1023 and is allowed to rotate freely. The other axial end of the rotor shaft 106 is supported by a second bearing 1042 held by a second bearing retainer 1032 and is allowed to rotate freely. The outer circumferential surface of the rotor core 107 is opposite to the inner circumferential surface of the armature core 11 through a gap of a predetermined size.

[0014] The power supply line 3, which supplies power to the armature coil 2, extends axially from the armature coil 2 on the radially inner side of the protrusion 1031, and includes a power supply terminal 31 facing the outside of the rotary motor 100 via a through hole 1033 provided in the end plate 103. The power supply terminal 31 is mechanically connected by means of screws or the like and electrically connected to a power source such as an inverter.

[0015] In addition, the rotor 105 is not limited to a permanent magnet type rotor. It can also be a cage rotor in which the uninsulated rotor conductor is housed in the slot of the rotor core and the two sides of the rotor conductor are short-circuited by a short-circuit ring, or a coil type rotor in which the insulated rotor coil is installed in the slot of the rotor core.

[0016] Figure 2 This is a perspective view of the armature in the rotary electric motor according to Embodiment 1. Figure 2In this embodiment, the armature 10 includes an armature core 11 and an armature coil 2. The armature core 11 includes a plurality of teeth 71 arranged radially in the inner periphery, a plurality of slots 72 formed between adjacent teeth 71, a magnetic yoke 70 connecting the individual teeth 71, and an armature coil 2 mounted in the slots 72. The armature coil 2 is connected, for example, to a three-phase delta connection or a three-phase star connection.

[0017] For example, an insulating sheet 73 made of insulating materials such as PET (Polyethylene terephthalate), PPS (Poly Phenylene Sulfide Resin), and aramid fiber is sandwiched between the coil 2 and the armature core 11, so that the coil 2 and the armature core 11 are electrically insulated.

[0018] The coil end 213 of the armature coil 2 is disposed at one end of the armature core 11 along the axial direction. The connecting conductor connecting the individual armature coils, the power supply line 3 supplying power to the armature coil 2, and the power supply terminal 31 connected to the power supply line 3 are disposed at the other end of the armature core 11 along the axial direction. The rotary motor 100 of Embodiment 1 is a three-phase AC rotary motor, with a power supply line 3 and a power supply terminal 31 provided for each of the three phases.

[0019] Next, the individual armature coils that constitute armature coil 2 will be described. Figure 3 This is a perspective view of a single armature coil unit in the rotary electric motor according to Embodiment 1. Figure 3 In this armature coil unit 21, a segmented coil is formed by bending a rectangular cross-section conductor into a U-shape. The armature coil unit 21 includes a first coil conductor portion 211 and a second coil conductor portion 212 inserted into a slot 72 of the armature core 11; a coil end portion 213 for electrical and mechanical connection to one end of each of the first and second coil conductor portions 211 and 212; a first coil terminal 214 formed at the other end of the first coil conductor portion 211; and a second coil terminal 215 formed at the other end of the second coil conductor portion 212. The material of the coil conductor 210 is, for example, copper or aluminum.

[0020] As described above, multiple armature coil units 21 are inserted into slots 72 of the armature core 11 and interconnected via connecting conductors at the other end of the armature core 11 in the axial direction to form armature coils 2. Sometimes, the first coil terminal 214, the second coil terminal 215, and the connecting conductors connecting the first coil terminal 214 and the second coil terminal 215 at the other end of the armature core 11 in the axial direction are collectively referred to as coil ends.

[0021] Figure 4This is a schematic diagram of the end of the armature coil unit viewed from a direction orthogonal to the axis of the rotating electric machine in Embodiment 1. Figure 5 This is an explanatory diagram showing the coil end of a single armature coil unit viewed from the axial direction of the rotating electric motor in Embodiment 1. Figure 4 When viewed from a direction orthogonal to the axis of the rotary motor 100, the coil end 213 is shaped like a mountain and has a top 216, a first inclined side 217 connecting one end of the top 216 and the first coil conductor portion 211, and a second inclined side 218 connecting the other end of the top 216 and the second coil conductor portion 212.

[0022] Figure 5 This is an explanatory diagram showing the coil end of a single armature coil unit viewed from the axial direction of the rotating electric motor in Embodiment 1. Figure 5 In the coil end 213, there is a crank portion 219 that is radially displaced between a first inclined portion 217 and a second inclined portion 218 along the rotary motor 100. The crank portion 219 includes a top 216 of the coil end 213.

[0023] The first beveled portion 217 of the coil end 213 includes a portion extending from the first coil conductor portion 211 (in relation to...) Figure 5 The first bend 220 extends backward in the direction perpendicular to the paper surface to the first inflection point A, and the second bend 221 extends from the first inflection point A to the crank portion 219. The base point P0 of the radius of curvature R1 of the first bend 220 is located on the axis of the rotary motor 100, and the base point P1 of the radius of curvature R2 of the second bend 221 is located at a position offset radially outward from the axis of the rotary motor 100. Here, [R1 > R2], the curvature of the second bend 221 is set to be greater than the curvature of the first bend 220. By changing the curvature in this way, it can be further displaced towards the outer diameter side.

[0024] The second beveled portion 218 of the coil end 213 includes a portion extending from the second coil conductor portion 212 (in conjunction with...) Figure 5 The third bend 222 extends backward in the direction perpendicular to the paper surface to the second inflection point B, and the fourth bend 223 extends from the second inflection point B to the crank portion 219. The base point P0 of the radius of curvature R3 of the third bend 222 is located on the axis of the rotary motor 100, and the base point P2 of the radius of curvature R4 of the fourth bend 223 is located at a position offset radially outward from the axis of the rotary motor 100. Here, [R3 > R4], and the curvature of the fourth bend 223 is set to be greater than the curvature of the third bend 222. By changing the curvature in this way, it can be further displaced towards the outer diameter side.

[0025] A first inclined portion 217 having a first bend 220 and a second bend 221, and a second inclined portion 218 having a third bend 222 and a fourth bend 223, are connected by a crank portion 219 including a top 216. The first inclined portion 217 is connected to the second inclined portion 218 via the crank portion 219, thereby displacing a dimension Y radially outward from the rotary motor 100. Here, dimension Y has a relationship [Y≥Z] with respect to the dimension Z of the width of the conductor constituting the coil end 213. The first bend 220, the second bend 221, the third bend 222, and the fourth bend 223 do not have inclined surfaces in their respective axial directions.

[0026] Multiple armature coil units 21, each with a first coil conductor portion 211 and a second coil conductor portion 212, are inserted into the slot 72 of the armature core 11 at a predetermined interval, thereby forming an armature coil 2. The first bevel portion 217 in the coil end 213 of the armature coil unit 21 is configured to overlap radially outward with the second bevel portion 218 in the coil end 213 of the adjacent armature coil unit 21.

[0027] As described above, by forming curved portions with different curvatures on the first inclined portion 217 and the second inclined portion 218 of the coil end 213, and by connecting the first inclined portion 217 and the second inclined portion 218 through the crank portion 219, interference in the coil end 213 of adjacent armature coil units 21 can be suppressed, and a smaller coil end can be achieved, thereby enabling the rotary motor 100 to be further miniaturized.

[0028] Furthermore, by having an inflection point, the inclined side can be displaced towards the outer diameter side, which can suppress interference with adjacent coil ends at the crank section. Moreover, when the coil end is viewed axially, it becomes a two-dimensional shape without twisting or bending, thus making it easy to manufacture and simplifying product shape management.

[0029] The connection between the first coil terminal 214 and the second coil terminal 215 in the armature coil unit 21 and the wiring conductor that connects the armature coil units to each other can be performed, for example, by welding, riveting while heating, brazing, etc.

[0030] Next, the manufacturing method of the armature coil in the rotary electric machine of Embodiment 1 will be described. Figures 6 to 10 This is a schematic diagram illustrating the manufacturing method of the armature coil unit in the rotary electric machine according to Embodiment 1. Figure 11 This is a perspective view illustrating the manufacturing method of the armature coil in the rotary electric machine according to Embodiment 1. First, as... Figure 6 As shown, a coil conductor 210 with an outer layer of insulating material and a rectangular cross-section is cut into a straight line, and the insulating layers coated at both ends are peeled off, thereby creating a first coil terminal 214 and a second coil terminal 215.

[0031] Next, as Figure 7 As shown, the crank portion 219 is formed at the center of the coil conductor 210 along its length, and then, as... Figure 8 As shown, the coil conductor 210 is bent in a direction perpendicular to the bending direction of the crank portion 219, thereby forming a first inclined portion 217, a second inclined portion 218, a first coil conductor portion 211, and a second coil conductor portion 212.

[0032] Next, as Figure 9 As shown, the coil end 213 of the armature coil unit 21 is sandwiched between the first mold 41 and the second mold 42, as... Figure 10 As shown, by pressing the first mold 41 toward the second mold 42, a first curved portion 220 and a second curved portion 221 are formed on the first inclined portion 217, and a third curved portion 222 and a fourth curved portion 223 are formed on the second inclined portion 218.

[0033] Here, the first bend 220, the second bend 221, the third bend 222, and the fourth bend 223 do not have inclined surfaces in their respective axial directions. Therefore, the first mold 41 and the second mold 42 can only have curved surfaces with curvature radii R1, R2, R3, and R4 corresponding to the first bend 220, the second bend 221, the third bend 222, and the fourth bend 223 of the coil end 213, without having inclined surfaces relative to the axial direction of each curved surface. Therefore, the first mold 41 and the second mold 42 are easy to manufacture, the dimensional accuracy of the formed coil conductor is easy to confirm, and quality management becomes easier.

[0034] like Figure 11 As shown, the first coil conductor portion 211 and the second coil conductor portion 212 of the armature coil unit 21 manufactured as described above are inserted into the slot 72 of the armature core 11 at a predetermined interval. Here, the coil conductor portions of two armature coil units 21 are inserted into one slot 72.

[0035] The coil ends 213 of each armature coil unit 21 exposed from one axial end of the armature core 11 overlap with the coil ends 213 of a plurality of adjacent armature coil units 21. Then, an insulating sheet 73 is inserted into a slot 72 along the axial direction of the armature core 11. Subsequently, the ends of each armature coil unit 21 exposed from the other axial end of the armature core 11 are shaped in the circumferential direction of the armature core 11 and have a predetermined shape, and are connected to another armature coil unit 21.

[0036] Figure 12A This is a schematic diagram showing the coil end of the armature coil in the rotary electric machine of Embodiment 1. Figure 12BThis is an explanatory diagram illustrating the coil end of the armature coil in the rotating electric machine according to Embodiment 1, showing... Figure 12A A portion of the armature 10 is enclosed by the box H shown in the dashed line. Figure 12A and Figure 12B In the case where the armature coil on the inner diameter side of the armature 10 is set as 201 and the armature coil on the outer diameter side is set as 202, the armature coil unit 201 on the inner diameter side has an inflection point 2011, and the armature coil unit 202 on the outer diameter side has inflection points 2021 and 2022.

[0037] These inflection points 2011, 2021, and 2022 are configured such that the inflection points are located further out radially from the armature core 11 and closer to the axial end face of the armature core 11. This configuration prevents interference between the inflection points, thereby enabling a smaller rotary motor.

[0038] When the axial distance between the inflection point 2011 of the armature coil unit 201 on the inner diameter side and the inflection point 2021 of the armature coil unit on the outer diameter side is set to K1, and the radial width of the coil conductor of each armature coil unit 201, 202 is set to D, it is preferably configured to satisfy [K1≥2D]. Furthermore, when the axial distance between the inflection point 2011 of the armature coil unit 201 on the inner diameter side and the inflection point 2022 of the armature coil unit 202 on the outer diameter side is set to K2, it is preferably configured to satisfy [K2≥2D]. Implementation method 2.

[0039] Next, the rotary motor involved in Embodiment 2 will be described. Figure 13 This is a perspective view of the armature in the rotary electric motor according to Embodiment 2. Figure 14 This is a perspective view of the armature coil in the rotary electric motor according to Embodiment 2. Figure 15 This is a schematic diagram obtained by viewing the coil end of a single armature coil unit from a direction orthogonal to the axis of the rotary electric machine in Embodiment 2. Figure 16 This is an explanatory diagram obtained by viewing the coil end of a single armature coil unit from the axial direction of the rotating electric motor in Embodiment 2. (See diagram below.) Figures 13 to 16 As shown, the armature 10 of the rotary electric machine includes an armature coil unit 2101 formed by winding a coil conductor 2111 with a rectangular cross section multiple times.

[0040] like Figures 13 to 16As shown, the armature coil unit 2101 has a first coil conductor portion 2001 and a second coil conductor portion 2002 inserted into a slot 72 formed between adjacent teeth 71 of the armature core 11, a first coil end 2131, a second coil end 2132, a first coil terminal 2141, and a second coil terminal 2151. Compared with the armature coil unit 21 of Embodiment 1 described above, the armature coil unit 2101 is constructed by winding two layers of coil conductor 2111 with a length approximately twice that of the first coil conductor.

[0041] The first coil end 2131 of the armature coil unit 2101 is formed into a mountain shape by overlapping two layers of coil conductors 211, and has a first inclined side 2171, a second inclined side 2181, and a first top 2161 located between the first inclined side 2171 and the second inclined side 2181. The second coil end 2132 is also formed into a mountain shape, and the second top 2162 is composed of a single layer of coil conductors 2111. The first inclined side 2172 and the second inclined side 2182 in the second coil end 2132 are formed by double layers of coil conductors 2111, and the first coil terminal 2141 and the second coil terminal 2151 are positioned corresponding to the second top 2162.

[0042] Additionally, near the first top 2161, a first crank portion 2191 is provided, which is formed in the same way as the crank portion 219 in the armature coil of the rotary motor of Embodiment 1, and near the second top 2162, a second crank portion 2192 is provided, which is formed in the same way as the crank portion 219 in the armature coil of the rotary motor of Embodiment 1.

[0043] Furthermore, the first inclined portion 2171 in the first coil end 2131 has an inflection point C. The base point P0 of the radius of curvature R5 of the first curved portion 2201 from the first coil conductor portion 2001 to the inflection point C is located on the central axis of the rotary motor, and the base point P3 of the radius of curvature R6 of the second curved portion 2211 from the inflection point C to the first crank portion 2191 is located at a position offset radially outward from the central axis of the rotary motor. Here, [R5 > R6], the curvature of the second curved portion 2211 is set to be greater than the curvature of the first curved portion 2201.

[0044] Regarding the manufacturing method of the armature coil in the rotary electric machine of Embodiment 2, firstly, a coil conductor 2111, which is almost twice the length of that in Embodiment 1, is cut into a straight line. Then, crank portions are formed at the central portion along the length of the straight coil conductor 2111, and at positions on both sides of the central portion corresponding to half a circumference of the armature coil unit 2101. Therefore, crank portions are formed at three locations.

[0045] Next, the straight coil conductor 2111 is wound two layers to form a mountain-shaped first coil end 2131 and a second coil end 2132. At this time, the crank portion formed in the aforementioned central part becomes... Figure 14 The second crank portion 2192 shown is formed by two overlapping crank portions on both sides of the aforementioned central portion, becoming... Figure 14 The first crank section 2191 shown.

[0046] Then, use the above. Figure 9 and Figure 10 The mold shown is identical to the first mold 41 and the second mold 42, with a first bent portion 2201 and a second bent portion 2211 formed in the first coil end 2131. The other parts are manufactured in the same way as the armature coil in Embodiment 1 described above.

[0047] In addition, Figure 16 In the first inclined side 2171, a second curved part 2211 is provided, but the distance from the inflection point C to the first crank part 2191 can also be a straight line.

[0048] As described above, since a bend is formed in the first inclined portion 2171 of the coil end 2131, the position of the first crank portion 2191 can be shifted to the outer diameter side, thereby avoiding interference with adjacent coils 2. Furthermore, by having an inflection point C, the first inclined portion 2171 can be shifted to the outer diameter side, suppressing interference between the crank portion and the coil ends of adjacent armature coil units, thus miniaturizing the coil end. Moreover, when the coil end is viewed axially, since a two-dimensional shape without twisting or bending is formed, the armature coil unit is easy to manufacture, and product shape management is also easier. Because it is a simple structure without a complex structure like a crank portion on the inclined portion, damage to the coating of the coil conductor is also reduced.

[0049] While this application describes various exemplary embodiments and examples, the various features, methods, and functions described in one or more embodiments are not limited to the application of a particular embodiment and can be applied to the embodiments individually or in various combinations. Therefore, numerous modifications not illustrated are contemplated within the scope of the technology disclosed in this application. For example, this may include cases involving modifications, additions, or omissions of at least one constituent element, as well as cases involving the extraction of at least one constituent element and its combination with constituent elements of other embodiments. Label Explanation

[0050] 100 Rotary Motor, 102 Frame, 1021 Bottom, 1022 Flange 1023 First bearing retainer, 103 End plate, 1031 Protrusion. 1032 Second bearing retainer, 110 Housing, 10 Armature, 11 armature core, 70 yoke, 71 teeth, 72 slots, 73 insulating sheets, 105 rotor. 106 Rotor shaft, 107 Rotor core, 108 Permanent magnet. 1041 First bearing, 1042 Second bearing, 2 armature coils 21 and 2101 armature coil units, 210 and 2111 coil conductors, 211, 2001 First coil conductor section; 212, 2002 Second coil conductor section; 213 coil end, 2131 first coil end, 2132 Second coil end, 214, 2141 First coil terminals, 215, 2151 Second coil terminal, 216 Top, 2161 First top, 2162 Second top, 217, 2171, 2172 First hypotenuse, 218, 2181, 2182 Second hypotenuse, 219 Crank section, 2191 First crank section, 2192 Second crank section, 220, 2201 First bending section, 221, 2211 Second bending section, 222 Third bend, 223 Fourth bend, 3 Power supply wire, 31 Power supply terminal, 41 First mold, 42 Second mold, A First inflection point, B Second inflection point, C, 2011, 2021, 2022 inflection points, R1, R2, R3, R4, R5, R6 radii of curvature.

Claims

1. A rotary electric motor, comprising: An armature core having a plurality of teeth arranged in a ring and a ring-shaped magnetic yoke connecting the plurality of teeth; An armature coil, which is mounted on the armature core; as well as The rotating electric motor is characterized by having a rotor with excitation poles and having its outer circumferential surface facing the inner circumferential surface of the armature core through a gap. The armature coil is composed of multiple armature coil units with a rectangular cross-section. The armature coil unit has: A first coil conductor portion and a second coil conductor portion are accommodated at a predetermined interval in slots formed between adjacent teeth; as well as The coil end, which connects the first coil conductor portion and the second coil conductor portion, is disposed at the axial end of the armature core. The coil end has: A crank portion is disposed at the top of the coil end and is radially displaced along the armature core; The first inclined portion connects the first coil conductor portion and the crank portion, and is inclined relative to the axial end face of the armature core; as well as The second inclined portion, which connects the second coil conductor portion and the crank portion, is inclined relative to the axial end face of the armature core. At least one of the first and second inclined portions has an inflection point before being connected to the crank portion, which serves as the base point of a bend that curves radially outward toward the armature core. The curved portion includes: The bend from the first coil conductor portion or the second coil conductor portion to the inflection point; as well as From the inflection point to the bend in the crank section The curvature of the bend from the first coil conductor portion or the second coil conductor portion to the inflection point and the curvature of the bend from the inflection point to the crank portion are formed to be different. The curvature of the bend from the inflection point to the crank section is configured to be greater than the curvature of the bend from the first coil conductor section or the second coil conductor section to the inflection point.

2. A rotary electric motor, comprising: An armature core having a plurality of teeth arranged in a ring and a ring-shaped magnetic yoke connecting the plurality of teeth; An armature coil, which is mounted on the armature core; as well as The rotating electric motor is characterized by having a rotor with excitation poles and having its outer circumferential surface facing the inner circumferential surface of the armature core through a gap. The armature coil is composed of multiple armature coil units with a rectangular cross-section. The armature coil unit has: A first coil conductor portion and a second coil conductor portion are accommodated at a predetermined interval in slots formed between adjacent teeth; as well as The coil end, which connects the first coil conductor portion and the second coil conductor portion, is disposed at the axial end of the armature core. The coil end has: A crank portion is disposed at the top of the coil end and is displaced radially along the armature core; The first inclined portion connects the first coil conductor portion and the crank portion, and is inclined relative to the axial end face of the armature core; as well as The second inclined portion, which connects the second coil conductor portion and the crank portion, is inclined relative to the axial end face of the armature core. At least one of the first and second inclined portions has an inflection point before being connected to the crank portion, which serves as the base point of a bend that curves radially outward toward the armature core. The inflection point is configured such that as the position of the inflection point moves further outward from the radial side of the armature core, the inflection point moves further and further closer to the axial end face of the armature core.

3. The rotary motor as described in claim 2, characterized in that, The curved portion includes: The bend from the first coil conductor portion or the second coil conductor portion to the inflection point; and From the inflection point to the bend in the crank section The curvature of the bend from the first coil conductor portion or the second coil conductor portion to the inflection point and the curvature of the bend from the inflection point to the crank portion are formed differently.

4. The rotary motor as described in claim 3, characterized in that, The curvature of the bend from the inflection point to the crank section is configured to be greater than the curvature of the bend from the first coil conductor section or the second coil conductor section to the inflection point.

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