Rotating electrical machine and method for its manufacture

Abstract

Rotating electric machine (1) with a pair of electrical conductors (111d) for forming a coil (111), wherein each of the electrical conductors (111d) has an end section with an end surface, and a weld (111b) formed between the end sections of the electrical conductors (111d) on the end surfaces of the end sections, wherein the end sections of the electrical conductors (111d) are arranged such that parts of the end sections of the electrical conductors (111d) are adjacent to one another, at least one of the end sections of the electrical conductors (111d) has at least one slot (111e; 111m) formed therein to divide the end surface of the end section into a plurality of sections, and the weld (111b) is formed to connect at least the adjacent parts of the end sections of the electrical conductors (111d) and the at least one slot (111e;111m) to cover, characterized in that of the plurality of sections of the end surfaces which are subdivided by the at least one slot (111e; 111m), a middle section has a smaller area than an outer section, wherein the middle section is located closer than the outer section to a boundary between the end sections of the electrical conductors (111d).

Description

CROSS-REFERENCE TO RELATED REGISTRATION

[0001] This application is based on and claims priority from Japanese patent application No.: 2016-42298, which was filed on March 4, 2016, the contents of which are hereby incorporated in their entirety into this application by reference. BACKGROUND 1. Technical field

[0002] The present invention relates to rotating electrical machines comprising a coil which is formed by arranging each corresponding pair of end sections of electrical conductors such that they are adjacent to one another and are welded on their end surfaces, and to methods for manufacturing the rotating electrical machines. 2. Description of the state of the art

[0003] There are known rotating electrical machines that have a coil formed by arranging each corresponding pair of end sections of electrical conductors so that they are adjacent to each other and welded together on their end surfaces.

[0004] For example, Japanese patent no. JP 3303854 B2 discloses an automotive alternator comprising a stator coil formed by welding together a plurality of substantially U-shaped conductor segments. More precisely, each end section of the conductor segments has a cutout (or groove) formed within it. Each corresponding pair of conductor segment end sections is arranged such that portions without a cutout are adjacent to each other, and then welded at their end surfaces. Consequently, the cutouts formed in the conductor segment end sections make it possible to weld each corresponding pair of conductor segment end sections together with reduced heat input to the pair during the welding process.

[0005] However, due to the cutouts for the molten metal mixture, it can easily escape outside the pair of conductor segment end sections during welding. Consequently, it can be difficult for the molten metal mixture to form a uniform weld bead. As a result, the thickness of the weld formed between the conductor segment end sections can become uneven, potentially leading to a local stress concentration within the weld. SUMMARY

[0006] According to an exemplary embodiment, a rotating electric machine is provided, comprising a pair of electrical conductors for forming a coil and a weld. Each of the electrical conductors has an end section with an end surface. The weld is formed between the end sections of the electrical conductors at the end surfaces of the end sections. Furthermore, the end sections of the electrical conductors are arranged such that portions of the end sections of the electrical conductors are adjacent to one another. At least one of the end sections of the electrical conductors has at least one slot formed therein to divide the end surface of the end section into a plurality of sections. The weld is formed to cover at least the adjacent portions of the end sections of the electrical conductors and the at least one slot.

[0007] According to an exemplary embodiment, a method for manufacturing a rotating electrical machine is also provided. The method comprises the steps of: (1) preparing a pair of electrical conductors to form a coil of the rotating electrical machine, each of the electrical conductors having an end section with an end surface, (2) forming at least one slot in at least one of the end sections of the electrical conductors to divide the end surface of the end section into a plurality of sections, (3) arranging the end sections of the electrical conductors such that portions of the end sections of the electrical conductors are adjacent to one another, and (4) welding the end sections of the electrical conductors to their end surfaces to form a weld that covers at least the adjacent portions of the end sections and the at least one slot.

[0008] As described above, according to the exemplary embodiments, at least one of the end sections of the electrical conductor has at least one slot formed therein. Since parts of the end section divided by the at least one slot have a lower heat capacity than the end section before the formation of the at least one slot, it is possible to weld the end sections of the electrical conductors with a reduced heat input to the end sections during welding. Furthermore, as the molten metal mixture rises during welding, the molten metal mixture flows into the at least one slot, thereby being retained by the parts of the end section divided by the at least one slot. Consequently, it is possible to prevent the molten metal mixture from leaking out of the end sections of the electrical conductor.As a result, it is possible to ensure a uniform weld bead shape of the molten metal mixture, thereby guaranteeing high weld strength, which is maintained during the solidification of the molten metal mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be more clearly understood with reference to the detailed description given below and the accompanying drawings of exemplary embodiments, although these should not be used to limit the invention to the specific embodiments, but merely serve for the purpose of explanation and understanding.

[0010] The accompanying drawings show:

[0011] Fig. 1 a partial cross-sectional view along an axial direction of a rotating electrical machine according to a first embodiment,

[0012] Fig. 2 a perspective view of a stator of the rotating electrical machine, wherein the stator is in a state in which end sections of insulated conductor segments are not welded to form a stator coil of the stator,

[0013] Fig. 3 a perspective view of part of the stator before the end sections of the insulated conductor segments are welded,

[0014] Fig. 4 a perspective view of part of the stator after the end sections of the insulated conductor segments have been welded,

[0015] Fig. 5 a perspective view of a part of the stator in which weld-insulating elements are provided to cover welds formed between the end sections of the insulated conductor segments,

[0016] Fig. 6 a perspective view of one of the isolated conductor segments,

[0017] Fig. 7 a front view of an end section of one of the isolated conductor segments,

[0018] Fig. 8 a top view of the end section of the insulated conductor segment according to Fig. 7,

[0019] Fig. 9 an axial end view of part of the stator before the end sections of the insulated conductor segments are welded,

[0020] Fig. 10 a front view of a pair of the insulated conductor segments to be welded together,

[0021] Fig. 11 a top view of the pair of insulated conductor segments according to Fig. 10,

[0022] Fig. 12 a first schematic representation, which shows a process of welding the pair of the in Fig. 10 and Fig. 11 isolated conductor segments are shown to illustrate,

[0023] Fig. 13 a second schematic representation illustrating the welding process,

[0024] Fig. 14 a third schematic representation illustrating the welding process,

[0025] Fig. 15 a fourth schematic representation illustrating the welding process,

[0026] Fig. 16 a fifth schematic representation illustrating the welding process,

[0027] Fig. 17 a front view of the pair of welded insulated conductor segments,

[0028] Fig. 18 a top view of the pair of welded insulated conductor segments,

[0029] Fig. 19 a cross-sectional view of the pair of insulated conductor segments with a weld-insulating element provided to cover the weld formed between the pair of insulated conductor segments,

[0030] Fig. 20 a front view of an end section of one of the insulated conductor segments according to a second embodiment,

[0031] Fig. 21 a top view of the end section of the in Fig. 20 isolated conductor segments shown,

[0032] Fig. 22 a top view of a pair of the insulated conductor segments according to the second embodiment, which are to be welded together,

[0033] Fig. 23 a top view of the in Fig. 22 pairs of isolated conductor segments shown,

[0034] Fig. 24 a top view of an end section of one of isolated conductor segments according to a third embodiment,

[0035] Fig. 25 a top view of the end section of the in Fig. 24 isolated conductor segments shown,

[0036] Fig. 26 a front view of a pair of the insulated conductor segments according to the third embodiment, which are to be welded together,

[0037] Fig. 27 a top view of the in Fig. 26 pairs of isolated conductor segments shown,

[0038] Fig. 28 a front view of an end section of one of insulated conductor segments according to a fourth embodiment,

[0039] Fig. 29 a top view of the end section of the in Fig. 28 isolated conductor segments shown,

[0040] Fig. 30 a top view of a pair of the insulated conductor segments according to the fourth embodiment, which are to be welded together,

[0041] Fig. 31 a top view of the in Fig. 30 pairs of isolated conductor segments shown,

[0042] Fig. 32 a front view of an end section of one of insulated conductor segments according to a fifth embodiment,

[0043] Fig. 33 a top view of the end section of the in Fig. 32 isolated conductor segments shown,

[0044] Fig. 34 a front view of a pair of insulated conductor segments according to the fifth embodiment, which are to be welded together,

[0045] Fig. 35 a top view of the pair of the in Fig. 34 isolated conductor segments shown,

[0046] Fig. 36 a front view of an end section of one of isolated conductor segments according to a sixth embodiment,

[0047] Fig. 37 a top view of the end section of the in Fig. 36 isolated conductor segments shown,

[0048] Fig. 38 a front view of a pair of the insulated conductor segments according to the sixth embodiment, which are to be welded together,

[0049] Fig. 39 a top view of the pair of in Fig. 38 isolated conductor segments shown, and

[0050] Fig. 40 An axial end view of part of a stator according to a modification, before end sections of insulated conductor segments are worn. DESCRIPTION OF EXAMPLES OF EXECUTION

[0051] Exemplary embodiments and their modifications are described below with reference to Fig. 1 to Fig. 40 described. It should be noted that, for the sake of clarity and understanding, identical components with identical functions have been marked throughout the description, where possible, with the same reference symbols in each of the figures, and that, to avoid redundancy, descriptions of identical components are not repeated. (First embodiment)

[0052] Fig. Figure 1 shows the overall configuration of a rotating electric machine 1 according to a first embodiment.

[0053] According to the present embodiment, the rotating electric machine 1 configured as a motor-generator for use in a motor vehicle. In particular, when supplied with electrical power from a (not shown) battery of the vehicle, the rotating electric machine functions 1as an electric motor to generate torque (or driving force) to propel the vehicle. Otherwise, when supplied with torque from a (not shown) power unit of the vehicle, the rotating electric machine functions as such. 1 as an electric generator to produce electrical power for charging the battery.

[0054] As it is in Fig. As shown in 1, the rotating electric machine 1 a case 10 , a stator 11 and a rotor 12 on.

[0055] The case 10 takes both the stator 11 as well as the rotor 12 it rests on it and supports the rotor 12 rotatable. The housing 10 features a few cup-shaped housing parts 100 and 101 on, which are joined together at their open ends.

[0056] The stator 11 is in the case 10attached in such a way that it defines the radial outer circumference of the rotor 12 surrounds the stator 11 forms part of a magnetic circuit that is used in the rotating electric machine 11 is formed. When supplied with electric current, the stator generates 11 a magnetic flux. In contrast, when a magnetic flux passes through the stator, it is generated. 11 by means of the rotor 12 is generated, the stator 11 an alternating current.

[0057] As it is in Fig. 1 and Fig. As shown in 2, the stator 11 a ring-shaped (or hollow cylindrical) stator core 110 and a stator coil 111 on, which are attached to the stator core 110 is mounted. The stator core 110 is attached to the inner circumferential surfaces of the housing parts 100 and 101 attached. The stator core 110 holds the stator coil 111 Furthermore, the stator core 110It is made of a magnetic material and forms part of the magnetic circuit in the rotating electric machine. 1 is formed in the stator core 110 are a multitude of grooves 110a formed, which pass axially through the stator core 110 penetrate through them and are spaced equally apart all around. Each of the grooves 110a has an essentially rectangular cross-section perpendicular to the axial direction of the stator core 110 on.

[0058] As it is in Fig. 2 to Fig. As shown in section 5, the stator coil 111 a large number of insulated conductor segments 111a , which are welded together, a multitude of welds 111b , each of which is located between a corresponding pair of end sections of the insulated conductor segments 111a is formed, and a variety of weld-insulating elements 111con, each of which is designed to protect the surfaces of one of the welds 111b and the corresponding pair of end sections of the insulated conductor segments 111a , which are through the weld seam 111b to cover them.

[0059] According to the present embodiments, as is the case in Fig. As shown in section 6, each isolated conductor segment 111a essentially U-shaped. Furthermore, as shown in Fig. 6 to Fig. Figure 8 shows each of the isolated conductor segments 111a an electrical conductor 111d , a pair of slits 111e and a conductor insulating element 111f on.

[0060] The electrical conductor 111d is obtained by using an electrical conductor wire 111gA conductor made of an electrically conductive metal (for example, copper) with a substantially rectangular cross-sectional shape is cut to a predetermined length and then formed into a substantially U-shape. Consequently, the electrical conductor 111d a pair of end surfaces that are opposite to each other.

[0061] Each of the slots 111e is in a pair of end sections of the essentially U-shaped electrical conductor 111d formed to form one of the end surfaces of the electrical conductor 111d to divide into two sections. As it is in Fig. As shown in 8, each of the slots is 111e formed in such a way that their longitudinal direction is parallel to the longer sides of the essentially rectangular end surface of the electrical conductor 111d is. Furthermore, each of the slots is 111eformed in such a way that the surfaces S1 and S2 of the two sections of the end surfaces, which are formed by the slot 111e The slots are divided and are equal to each other. Additionally, the slots can be... 111e for example, formed by cutting.

[0062] The conductor insulating element 111f It is made, for example, from an electrically insulating resin. The conductor-insulating element 111f is intended to cover the entire outer circumference of the electrical conductor 111d with the exception of the pair of end sections of the essentially U-shaped electrical conductor 111d to cover.

[0063] Additionally, it shows how it is in Fig. Figure 6 shows each of the isolated conductor segments 111a a pair of in-groove sections 111 on, each in two different grooves 110a of the stator core 110 are recorded.

[0064] According to the present embodiment, when forming the stator coil 111 the isolated conductor segments 111a into the respective grooves 110a of the stator core 110 from a first axial side (i.e. the lower side in Fig. 2) of the stator core 110 used, which causes the in-groove sections to 111f the isolated conductor segments 111a in the respective grooves 110a are recorded. Furthermore, as stated in Fig. 2 and Fig. Figure 3 shows distal parts of the isolated conductor segments 111a , which lie outside the respective grooves 110a of the stator core 110 on a second axial side (i.e., the upper side in Fig. 2 and Fig. 3) of the stator core 110 protrude, arranged together (or deformed) to form a ring shape on the second axial side of the stator core 110 to form. Furthermore, as is stated in Fig. As shown in 9, the end section of the electrical conductor 110d on the second axial side of the stator core 110 arranged such that, when along the axial direction of the stator core 110 (or viewed along the direction perpendicular to the end surfaces of the end sections), the longitudinal direction of each of the slots 111e , which are located in the end sections of the electrical conductors 111d are formed perpendicular to a radial direction of the stator core 110 is. Furthermore, as is stated in Fig. 9 to Fig. Figure 11 shows each pair of the end sections of the electrical conductors 111d , which are to be welded together, arranged such that: parts of the pair of end sections of the electrical conductor 111d in a radial direction of the stator core 110 adjacent to each other, and two slots 111e , each in the pair of end sections of the electrical conductors 111dThe formed sections extend parallel to each other. Then the pair of end sections of the electrical conductors is formed. 111d welded to their end surfaces to form one of the weld seams 111b to form the abutting parts and the slots 111e covers the pair of end sections.

[0065] In particular, as it is in Fig. Figure 12 shows the welding process of the pair of end sections of the electrical conductors. 111d Each is grounded by a pair of ground electrodes EE. To prevent the mixing of nitrogen and / or oxygen, a shielding gas SG is introduced from a distal end (i.e., the lower end in) Fig. 12) of a welding torch T to the pair of end sections of the electrical conductors 111dEjected. When a voltage is applied to a welding rod WR, taking the mass electrodes EE as a reference, an electric arc A is generated between a distal end section (i.e., a lower end section in Fig. 12) of the welding rod WR and the pair of end sections of the electrical conductors 111d generated.

[0066] When generating the electric arc A, as described in Fig. Figure 13 shows parts of the pair of end sections of the electrical conductors 111d , which pass through the respective slots 111e are divided, the middle parts (or inner parts) are first melted at their distal ends, which are a molten metal mixture 111h form. The parts of the end sections of the electrical conductors exhibit the following characteristics. 111d , which pass through the respective slots 111e are divided, have a lower heat capacity than the end sections of the electrical conductors 111dbefore forming the respective slots 111e This results in the middle parts being melted with a reduced heat input. Consequently, it becomes possible to melt the middle parts with a reduced heat input.

[0067] It continues to grow, as shown in Fig. Figure 14 shows the molten metal mixture 111h Over time, it grows so large that it expands. During this expansion, the molten metal mixture flows. 111h into each of the slots 111e , which are in the pair of end sections of the electrical conductors 111d are formed by the parts of the end sections that pass through the slot 111e are divided, from both sides of the shooter 111e is contained. Consequently, it becomes possible to prevent the molten metal mixture from 111h outside the pair of end sections of the electrical conductors 111d expiring.

[0068] As a result, as it is in Fig. Figure 15 shows the distal ends of the pair of end sections of the electrical conductors. 111d the molten metal mixture 111h , which has a uniform weld bead shape, formed without outward extension.

[0069] Furthermore, as is stated in Fig. Figure 16 shows the molten metal mixture upon cooling. 111h solidified to form one of the weld seams 111b to form a weld bead shape that also has a uniform shape without outward extension.

[0070] Additionally, the welding process is carried out along the longitudinal direction of the slots. 111e over the entire circumferential length of the pair of end sections of the electrical conductors 111d either by rotating the stator core 110 in the direction of rotation or with movement of the welding torch T in the direction of rotation of the stator core 110 carried out.

[0071] In the manner described above, each corresponding pair of the end sections of the electrical conductors is 111d all isolated conductor segments 111a screwed up, to make one of the welds 111b to form in between, as it is in Fig. 4 and Fig. 17 to Fig. 18 is shown.

[0072] Each of the weld-insulating elements 111c is made, for example, from an electrically insulating resin. As it is described in Fig. As shown in section 5, each of the weld-insulating elements is 111c intended to clean the surface of one of the welds 111b and the corresponding pair of end sections of the electrical conductors 111d the isolated conductor segments 111a to cover the area affected by the weld seam 111b are connected. More precisely, according to the present embodiment, as it is in Fig. As shown in 19, each of the weld-insulating elements 111cintended to clean the surface of one of the welds 111b and the distal end sections of the conductor insulating elements 111f to cover each pair of weld seams 111b connected electrical conductor 111d cover.

[0073] And renewed reference to Fig. 1 forms the rotor 12 a part of the magnetic circuit that is in the rotating electric machine 1 is formed. If through the stator 11 a magnetic flux through the rotor 12 The rotor generates what is generated. 12 a torque. In contrast, the rotor generates 12 When rotated, a magnetic flux is generated by torque supplied by the vehicle's engine, passing through the stator coil. 111 This results in an alternating current in the stator coil. 111 is induced. The rotor 12 has a ring-shaped (or hollow cylindrical) red nucleus120 and a rotating shaft 121 on.

[0074] The rotor core 120 is made of a magnetic material and forms part of the magnetic circuit in the rotating electric machine 1 is formed at a radially central part of the rotor core. 120 is a circular opening 120a formed in such a way that they form the rotor core 120 axially penetrates. Furthermore, on a radially outer circumference of the rotor core, 120 Magnets arranged to form a multitude of magnetic poles. The rotor core 120 is located radially inside the stator core 110 , so that the radial outer circumference of the rotor core 120 arranged magnets on the radially inner surface of the stator core 110 are facing each other across a predetermined air gap formed between them.

[0075] The rotating shaft 121It is made of a metal and has an essentially cylindrical shape. The rotating shaft 121 is in the passageway 120a of the rotor core 120 firmly fitted and is held in place by the housing 10 about a couple of camps 121a rotatably supported.

[0076] The following is an operation of the rotating electric machine. 1 as described in the present embodiment.

[0077] As described above, according to the present embodiment, the rotating electric machine 1 configured as a motor-generator that selectively operates either in a motor mode or in a generator mode.

[0078] In motor operating mode, the stator coil 111 Electrical power is supplied from the vehicle's battery. Consequently, electric current flows in the stator coil. 111, which generates a magnetic flux. The generated magnetic flux passes through the rotor. 12 , which causes the rotor 12 rotates and generates torque to drive the vehicle.

[0079] In generator mode, the rotor 12 The stator coil is rotated by torque supplied by the vehicle's engine, thereby generating a magnetic flux. This generated magnetic flux passes through the stator coil. 11 , where an alternating current is present in the stator coil 111 The alternating current is induced. The alternating current is then rectified into direct current, and the resulting direct current is used to charge the vehicle's battery.

[0080] According to the present embodiment, it is possible to achieve the following advantageous effects.

[0081] According to the present embodiment, the rotating electric machine 1 the stator coil 111on, which are caused by welding the electrical conductors 111d the isolated conductor segments 111a is formed together. In particular, each of the end sections of the electrical conductors has 111d one of the slots 111e formed therein to divide the end surface of the end section into two sections. When forming the stator coil 11 are each pair of the end sections of the electrical conductors 111d , which are to be welded together, arranged such that parts of the pair of end sections of the electrical conductors 111d Adjacent to each other. Then the pair of end sections of the electrical conductors 111d their end surfaces are worn to form one of the weld seams 111b to form, which at least the adjacent parts and the slots 111e of the pair of end sections. More precisely, according to the present embodiment, the weld seam covers 111bthe entire end surfaces of the pair of end sections of the electrical conductors 111d away.

[0082] Since the parts of the end sections of the electrical conductors 111d , which pass through the respective slots 111e are divided, have a lower heat capacity than the end sections of the electrical conductors 111d before forming the respective slits 111e exhibiting this, it is possible to distinguish each pair of the end sections of the electrical conductors 111d to weld the pair of end sections with reduced heat input during welding. Furthermore, as the molten metal mixture increases, it flows. 111h during welding, the molten metal mixture 111h into each of the slots 111e , which are in the pair of end sections of the electrical conductors 111d are formed, whereby it passes through the parts of the end section that go through the slot 111eare divided, from both sides of the slot 111e is contained. Consequently, it is possible to prevent the molten metal mixture from 111h outside the pair of end sections of the electrical conductors 111d The process runs out. As a result, it is possible to achieve a uniform weld bead shape of the molten metal mixture. 111h to ensure high weld strength 111b This ensures that the molten metal mixture solidifies. 111h will be received.

[0083] According to the present embodiment, the rotating electric machine 1 also the ring-shaped stator core 110 on, which the stator coil 111 It holds. During the formation of the stator coil 111 will the electrical conductors 111d arranged such that the end sections of the electrical conductors 111dfrom an axial end face (i.e., the upper face in the Fig. 2 to Fig. 5) of the stator core 110 protrude, and that the longitudinal direction of each of the slots 111e , which are located in the end sections of the electrical conductors 111d be shaped perpendicular to a radial direction of the stator core 110 is (see Fig. 3 and Fig. 9).

[0084] With the arrangement described above, it is possible to isolate each pair of the end sections of the electrical conductors. 111d along the longitudinal direction of the slots 111e , which are formed within it, to weld together, during the stator core 110 is rotated in the direction of rotation, or the welding torch T is rotated in the direction of rotation of the stator core. 110 is moved. Consequently, it is possible to improve the efficiency of the welding process while reliably preventing the molten metal mixture from moving. 111hfrom the pair of end sections of the electrical conductors 111d is expiring. As a result, it is possible to reduce the manufacturing time of the stator coil. 111 to minimize, while ensuring high strength of the stator coil 111 is guaranteed. (Second example)

[0085] A rotating electric machine 1 According to a second embodiment, it has almost the same structure as the rotating electric machine. 1 as in the first embodiment. Accordingly, the differences between them are mainly described below.

[0086] According to the first embodiment, each of the electrical conductors consists 111d the isolated conductor segments 111a from a single electrical conductor wire 111g .

[0087] In contrast, according to the present embodiment, as described in Fig. 20 and Fig. As shown in 21, each of the electrical conductors 111d the isolated conductor segments 111a from a pair of electrical conductor wires 111i and 111j , which are arranged in such a way that they are adjacent to (or abutting) each other. The area of ​​a cross-section of the electrical conductor wire. 111i perpendicular to an axial direction (or longitudinal direction) of the electrical conductor wire 111i is equal to the area of ​​a cross-section of the electrical conductor wire 111j perpendicular to an axial direction of the electrical conductor wire 111j .

[0088] Furthermore, each of the end sections of the electrical conductor wires has 111i and 111j a section formed on one of its side surfaces. Each pair of the end sections of the electrical conductor wires. 111i and 111jare arranged such that the cutouts formed in the pair of end sections are continuous. Consequently, the cutouts together form a slot. 111e , which is located in the end section of the electrical conductor 111d is formed from the pair of end sections of the electrical conductor wires 111i and 111j consists of the end surface of the end section of the electrical conductor 111d to divide into two equal sections. That is, the area S1 of a first section, which consists of the end surface of the end section of the electrical conductor wire, 111i consists of the area S2 of a second section, which is the end surface of the end section of the electrical conductor wire. 111j consists of. Additionally, as is stated in Fig. 21 is shown, the slot 111e between the pair of end sections of the electrical conductor wires 111i and 111ialong a longitudinal direction of the essentially rectangular end surface of the end section of the electrical conductor 111d educated.

[0089] Furthermore, as is stated in Fig. 22 and Fig. Figure 23 shows how, according to the first embodiment, the end sections of the electrical conductors 111d arranged such that, when along the axial direction of the stator core 110 (or viewed along the direction perpendicular to the end surfaces of the end sections), the longitudinal direction of each of the slots 111e , which are located in the end sections of the electrical conductors 111d are shaped perpendicular to a radial direction of the stator core 110 is. Furthermore, each pair of the end sections of the electrical conductors 111d , which are to be welded together, arranged such that: parts of the pair of end sections of the electrical conductors 111d in a radial direction of the stator core 110adjacent to each other, and the two slots 111e , each in the pair of end sections of the electrical conductors 111d The formed sections extend parallel to each other. Then the pair of end sections of the electrical conductors are 111d welded to their end surfaces to form one of the weld seams 111b to form the adjacent parts and the slots 111e covers the pair of end sections.

[0090] According to the present embodiment, it is possible to achieve the same advantageous effects as can be achieved according to the first embodiment.

[0091] Furthermore, according to the present embodiment as described above, each of the electrical conductors 111d from a pair of electrical conductor wires 111i and 111j, which are arranged so that they are adjacent to each other. This makes it possible to vary the cross-sectional area of ​​each of the electrical conductor wires by varying the combination of these wires. 111d to vary, while increasing the number of parts of the rotating electric machine 1 is suppressed. Furthermore, in comparison to the first embodiment, according to which each of the electrical conductors 111d from a single electrical conductor wire 111g It is possible to reduce the cross-sectional area of ​​each electrical conductor wire, thereby reducing the eddy current loss in each of the electrical conductors. 111d is reduced.

[0092] Furthermore, according to the present embodiment as described above, in each of the end sections of the electrical conductors 111d the slot 111e between the end sections of the electrical conductor wires 111iand 111j formed, which together constitute the end section of the electrical conductor 111d form. In this way it is possible to create the slot. 111e easy to form. (Third embodiment)

[0093] A rotating electric machine 1 According to a third embodiment, it has almost the same structure as the rotating electric machine. 1 as in the first embodiment. Accordingly, the main differences are described below.

[0094] According to the first embodiment, each of the end sections of the electrical conductors has 111d the slit formed within it 111e to divide the final surface of the end section into two sections whose areas are equal to each other.

[0095] In comparison, according to the present embodiment, as described in Fig. 24 and Fig. As shown in 25, each of the end sections of the electrical conductors 111d the slit formed therein 111e to divide the final surface of the end section into two sections whose surfaces differ from each other, i.e., a first section has a surface S3 and a second section has a surface S4, where S3 < S4.

[0096] Additionally, as in the first embodiment, each of the electrical conductor wires consists 111d the isolated conductor segments 111a from a single electrical conductor wire 111g , which has an essentially rectangular cross-sectional shape. In each of the end sections of the electrical conductors 111d is the slot 111e formed in such a way that a longitudinal direction of the slot 111e parallel to the longer side of the essentially rectangular end surface of the end section.

[0097] As it is in Fig. 26 and Fig. As shown in 27, these are the end sections of the electrical conductors 111d arranged such that, when along the axial direction of the starter core 110 (or along the direction perpendicular to the end surfaces of the end sections), the longitudinal direction of each of the electrical conductors in the end sections 111d formed slit 111e perpendicular to a radial direction of the starter core 110 is. Furthermore, each pair of the end sections of the electrical conductors 111d , which are to be welded together, arranged such that: the pair of end sections of the electrical conductors 111d next to each other in a radial direction of the stator core 110 adjacent, the two slots 111e , each in the pair of end sections of the electrical conductors 111dare formed, extend parallel to each other, and the first sections of the end surfaces of the pair of end sections meet each other in the radial direction of the stator core. 110 adjacent. This means that of the sections of the end surfaces that are defined by the respective slots. 111e are subdivided, the middle sections (i.e. the first sections) have a smaller area than the outer sections (i.e. the second sections), the middle sections being closer to the outer sections to the boundary between the pair of end sections of the electrical conductors 111d are arranged more closely. Then the pair of end sections of the electrical conductors 111d welded to their end surfaces to form the weld seam 111b to form the adjacent parts and the slot 111e covers the pair of end sections.

[0098] According to the present embodiment, it is possible to achieve the same advantageous effects as can be achieved according to the first embodiment.

[0099] Furthermore, when welding each pair of the end sections of the electrical conductors 111d , which are arranged so that they are adjacent to one another, are subjected to heat such that the temperature at the middle parts (i.e., the adjacent parts) is higher than at the outer parts of the pair of end sections. According to the present embodiment, as described above, each pair of end sections of the electrical conductors is 111d arranged such that the area S3 of the middle sections (i.e., the first sections) is smaller than the area S4 of the outer sections (i.e., the second sections) of the end surfaces of the pair of end sections. That is to say, the middle parts of the pair of end sections of the electrical conductors 111dThey have a lower heat capacity than their outer parts. Consequently, it is possible to reliably control the heat supply to the pair of end sections of the electrical conductors. 111d to suppress during welding. (Fourth example)

[0100] A rotating electric machine 1 According to a fourth embodiment, it has almost the same structure as the rotating electric machine. 1 according to the third embodiment. Accordingly, the differences between them are mainly described below.

[0101] According to the third embodiment, each of the electrical conductors consists 111d the isolated conductor segments 111a from a single electrical conductor wire 111g .

[0102] In contrast, according to the present embodiment, as described in Fig. 28 and Fig. As shown in 29, each of the electrical conductors 111d the isolated conductor segments 111a from a pair of electrical conductor wires 111k and 111l , which are arranged in such a way that they are adjacent to (or abutting) each other. The area of ​​a cross-section of the electrical conductor wire. 111k perpendicular to an axial direction (or longitudinal direction) of the electrical conductor wire 111k is smaller than the area of ​​a cross-section of the electrical conductor wire 111l perpendicular to an axial direction of the electrical conductor wire 111l .

[0103] Furthermore, each of the end sections of the electrical conductor wires has 111k and 111l a section formed in one of its side surfaces. Each pair of the end sections of the electrical conductor wires. 111k and 111lThey are arranged such that the cutouts formed in the pair of end sections are continuous with each other. Consequently, the cutouts together form a slot. 111e , which is in the end section of the electrical conductor 111d which is formed from the pair of end sections of the electrical conductor wires 111k and 111l consists of the end surface of the end section of the electrical conductor 111d to divide into first and second sections, whose surfaces differ from each other. More precisely, the surface S3 of the first section, which consists of the end surface of the end section of the electrical conductor wire, is 111k consists of an area smaller than the area S4 of the second section, which consists of the end surface of the end section of the electrical conductor wire 111l consists of. Additionally, as is stated in Fig. 29 is shown, the slot 111e between the pair of end sections of the electrical conductor wires 111k and111l along a longitudinal direction of the essentially rectangular end surface of the end section of the electrical conductor 111d educated.

[0104] Furthermore, as is stated in Fig. 30 and Fig. Figure 31 shows how, according to the third embodiment, the end sections of the electrical conductors 111d arranged such that, when along the axial direction of the stator core 110 (or viewed along the direction perpendicular to the end surfaces of the end sections), the longitudinal direction of each of the slots 111e , which are located in the end sections of the electrical conductors 111d are formed perpendicular to a radial direction of the stator core 110 is. Furthermore, each pair of the end sections of the electrical conductors 111d , which are to be welded together, arranged such that: parts of the pair of end sections of the electrical conductors 111d in a radial direction of the stator core110 adjacent to each other, the two slots 111e , each in the pair of end sections of the electrical conductors 111d are formed, extend parallel to each other, and the first sections of the end surfaces of the pair of end sections in the radial direction of the stator core 110 adjacent to each other. This means that of the sections of the end surfaces that are connected by the respective slots. 111e are subdivided into the middle sections (i.e., the first sections, each consisting of the end surfaces of the end sections of the electrical conductor wires). 111k (consisting of) a smaller area than the outer sections (i.e., the second sections, each consisting of the end surfaces of the end sections of the electrical conductor wires) 111l (exist); the middle sections are closer to the outer sections at the boundary between the pair of end sections of the electrical conductor wires 111dare located. Then the pair of end sections of the electrical conductors will be 111d welded to their end surfaces to form one of the weld seams 111b to form the adjacent parts and the slots 111e covers the pair of end sections.

[0105] According to the present embodiment, it is possible to achieve the same advantageous effects as can be achieved according to the third embodiment.

[0106] Furthermore, according to the present embodiment as described above, each of the electrical conductors 111d from a pair of electrical conductor wires 111k and 111l , which are arranged to butt against each other. Therefore, by varying the combination of electrical conductor wires, it is possible to change the cross-sectional area of ​​each of the electrical conductors. 111d to vary, while increasing the number of parts in the rotating electric machine1 is suppressed. Furthermore, in comparison to the third embodiment, according to which each of the electrical conductors 111d from a single electrical conductor wire 111g It is possible to reduce the cross-sectional area of ​​each electrical conductor wire, thereby reducing the eddy current loss of each electrical conductor. 111d is reduced.

[0107] Additionally, according to the present embodiment as described above, in each of the end sections of the electrical conductor 111d the slot 111e between the end sections of the electrical conductor wires 111k and 111l formed, which together constitute the end section of the electrical conductor 111d form. In this way it is possible to create the slot. 111e easy to form. (Fifth example)

[0108] A rotating electric machine 1According to a fifth embodiment, it has almost the same structure as the rotating electric machine. 1 as in the first embodiment. Accordingly, the differences between them are mainly described below.

[0109] According to the first embodiment, each of the end sections of the electrical conductors has 111d a single slit formed therein 111m to divide the final surface of the end section into two sections.

[0110] In comparison, according to the present embodiment, as described in Fig. 32 and Fig. As shown in 33, each of the end sections of the electrical conductors 111d two slits formed within it 111mto divide the end surface of the end section into three sections whose areas differ from each other, i.e., a first section with area S5, a second section with area S6, and a third section with area S7, where S5 < S6 < S7. The second section is located between the first and third sections, with one of the two slots 111m between the first section and the second section, including a slot 111m between the second section and the third section.

[0111] Additionally, as in the first embodiment, each of the electrical conductors consists 111d the isolated conductor segments 111a from a single electrical conductor wire 111g , which has an essentially rectangular cross-sectional shape. In each of the end sections of the electrical conductors 111d are the two slots 111mformed in such a way that a longitudinal direction of the slots 111m parallel to the longer sides of the essentially rectangular end surface of the end sections.

[0112] As it is in Fig. 34 and Fig. As shown in 35, these are the end sections of the electrical conductors 111d arranged such that, when along the axial direction of the starter core 110 (or viewed along the direction perpendicular to the end surfaces of the end sections), the longitudinal direction of each of the slots 111m , which are located in the end sections of the electrical conductors 111d are formed perpendicular to a radial direction of the stator core 110 is. Furthermore, each pair of the end sections of the electrical conductors 111d , which are to be welded together, arranged such that: parts of the pair of end sections of the electrical conductors 111d in a radial direction of the starter core 110adjacent to each other, all of the slots 111m , which are in the pair of end sections of the electrical conductors 111d are shaped, extend parallel to each other, and the first sections of the end surfaces of the pair of end sections in the radial direction of the starter core 110 Adjacent to each other. This means that for each pair of the end sections of the electrical conductors 111d the first, second and third sections of the end surfaces of the end section are arranged such that the surfaces S5, S6 and S7 of the three sections point in a direction away from the boundary between the pair of end sections of the electrical conductors 111d increase. Then the pair of end sections of the electrical conductors will be increased. 111d welded to their end surfaces to form one of the weld seams 111b to form the adjacent parts and the slots 111m covers the pair of end sections.

[0113] According to the present embodiment, it is possible to achieve the same advantageous effects as can be achieved according to the first embodiment.

[0114] Furthermore, according to the present embodiment as described above, each of the end sections of the electrical conductors has 111d two slits formed within it 111m to divide the final surface of the end section into three sections. That is, the number of slots into which the molten metal mixture flows. 111h The amount of molten metal flowing during welding is doubled compared to the first embodiment. Consequently, it is possible to more reliably prevent leakage of the molten metal mixture. 111h to prevent this during welding.

[0115] Furthermore, according to the present embodiment as described above, each pair of the end sections of the electrical conductors 111dThe end sections, which are to be welded together, are arranged such that for each pair of end sections, the areas of the three sections of the end surface of the end sections increase in the direction away from the boundary between the pair of end sections. That is to say, for each pair of end sections, the heat capacities of the three parts of the end section that pass through the two slots 111m The division increases in the direction away from the boundary between the pair of end sections. Consequently, during the welding of the pair of end sections, it is possible to prevent the molten metal mixture from 111h grows rapidly and extends beyond the pair of terminal sections. (Sixth embodiment example)

[0116] A rotating electric machine 1 According to a sixth embodiment, it has almost the same structure as the rotating electric machine. 1as per the fifth embodiment. Accordingly, the differences between them are mainly described below.

[0117] According to the fifth embodiment, each of the electrical conductors consists 111d the isolated conductor segments 111a from a single electrical conductor wire 111g In comparison, according to the present embodiment, as described in Fig. 36 and Fig. As shown in 37, each of the electrical conductors 111d the isolated conductor segments 111a made of three electrical conductor wires 111n , 111o and 111p , which are arranged in such a way that they are adjacent to (or abutting) each other. The area of ​​a cross-section of the electrical conductor wire. 111n perpendicular to an axial direction (or longitudinal direction) of the electrical conductor wire 111n is smaller than the area of ​​a cross-section of the electrical conductor wire 111operpendicular to an axial direction of the electrical conductor wire 111o , and the area of ​​the cross-sectional area of ​​the electrical conductor wire 111o is smaller than the area of ​​a cross-section of the electrical conductor wire 111p , perpendicular to an axial direction of the electrical conductor wire 111p is.

[0118] Furthermore, each of the end sections of the electrical conductor wires has 111n and 111p a cutout formed in one of its side surfaces, whereas each of the end sections of the electrical conductor wire 111o It has two cutouts, each formed in opposite side surfaces. Each trio of the end sections of the electrical conductor wires 111n , 111o and 111p is arranged in such a way that the cutouts formed in the trio of end sections together form two slots 111m form. The two slits 111mare in the end section of the electrical conductor 111d formed from the trio of end sections of the electrical conductor wires 111n , 111o and 111p consists of the end surface of the end section of the electrical conductor 111d to be divided into three sections, the surfaces of which differ from each other. More precisely, the surface S5 of the first section, which consists of the end surface of the end section of the electrical conductor wire, is 111n consists of an area smaller than the S6 area of ​​the second section, which is formed from the end surface of the end section of the second electrical conductor wire 111o consists of, and the area S6 of the second section is smaller than the area S7 of the third section, which consists of the end surface of the end section of the electrical conductor wire. 111p The second section is located between the first and third sections, with one of the two slots 111mbetween the first section and the second section, and the other slot 111m between the second section and the third section. Additionally, as stated in Fig. Figure 37 shows the two slots 111m between the end sections of the electrical conductor wires 111n , 111o and 111p along a longitudinal direction of the essentially rectangular end surface of the end section of the electrical conductor 111d educated.

[0119] Furthermore, as is stated in Fig. 38 and Fig. Figure 39 shows how, according to the fifth embodiment, the end sections of the electrical conductors 111d arranged such that, when along the axial direction of the starter core 110 (or viewed along the direction perpendicular to the end surfaces of the end sections), the longitudinal direction of each of the slots 111m , which are located in the end sections of the electrical conductors111d are formed perpendicular to a radial direction of the starter core 110 is. Furthermore, each pair of the end sections of the electrical conductors 111d , which are to be welded together, arranged such that: parts of the pair of end sections of the electrical conductors 111d in a radial direction of the stator core 110 adjacent to each other, all of the slots 111m , which are in the pair of end sections of the electrical conductors 111d are formed, extend parallel to each other, and the first sections of the end surfaces of the pair of end sections in the radial direction of the starter core 110 Adjacent to each other. This means that for each of the pair, the end sections of the electrical conductors 111dthe first, second and third sections of the end surface of the end section are arranged such that the surfaces S5, S6 and S7 of the three sections face in a direction away from the boundary between the pair of end sections of the electrical conductors 111d increase. Then the pair of end sections of the electrical conductors will be increased. 111d welded to the end surfaces to form one of the weld seams 111b to form the adjacent parts and the slots 111m covers the pair of end sections.

[0120] According to the present embodiment, it is possible to achieve the same advantageous effects as can be achieved according to the fifth embodiment.

[0121] Furthermore, according to the present embodiment as described above, each of the electrical conductors 111d made of three electrical conductor wires 111n , 111o and 111p, which are arranged in such a way that they are adjacent to each other. Therefore, by varying the combination of the electrical conductor wires, it is possible to change the cross-sectional area of ​​each of the electrical conductors. 111d to vary, while increasing the number of parts of the rotating electric machine 1 is suppressed. Furthermore, in comparison to the fifth embodiment, according to which each of the electrical conductors 111d from a single electrical conductor wire 111g It is possible to reduce the cross-sectional area of ​​each electrical conductor wire, thereby reducing the eddy current loss of each electrical conductor. 111d is reduced.

[0122] In addition, according to the present embodiment as described above, in each of the end sections of the electrical conductors 111d the two slots 111m between the end sections of the electrical conductor wires 111n, 111o and 111p formed, which together constitute the end section of the electrical conductor 111d form. In this way it is possible to create the slot. 111e easy to form.

[0123] Although the specific embodiments described above have been shown and described, it will be understood by the person skilled in the art that the present invention can also be implemented in various other ways without deviating from the inventive idea.

[0124] For example, according to the first to sixth embodiments, each of the welds 111b between two of the end sections of the electrical conductors 111d formed. However, each of the welds can 111b also between three or more of the end sections of the electrical conductors 111d can be formed. In other words, it is also possible to form three or more of the end sections of the electrical conductors. 111dto arrange them so that they are adjacent to each other, and to weld them together to form one of the weld seams 111b to form in between.

[0125] According to the first to sixth embodiments, for each pair of the end sections of the electrical conductors 111d , which are to be welded together, each end section of the pair has one or two slots formed in it. However, it is also possible to form at least one slot in at least one of the end sections of the pair.

[0126] According to the first to sixth embodiments, each of the end sections of the electrical conductors has 111d One or two slots formed within it divide the end surface of the end section into two or three sections. However, each of the end sections of the electrical conductor can 111dalso have three or more slots formed therein to divide the end surface of the end section into four or more sections.

[0127] According to the second, fourth and sixth embodiments, each of the electrical conductors consists of 111d consisting of two or three electrical conductor wires arranged so that they are adjacent to each other. However, each of the electrical conductors can 111d They also consist of four or more electrical conductor wires arranged so that they are adjacent to one another. Furthermore, each of the electrical conductor wires can have an insulating element covering its outer surface, thus improving the insulating properties of the electrical conductors. 111d is improved. Furthermore, it is preferable to improve the end sections of the electrical conductors. 111dto weld, with all insulating elements removed, thus preventing the generation of gaseous material during welding due to the melting of the insulating elements. Consequently, it would be possible to prevent gas from forming in the space between the end sections of the electrical conductors. 111d formed weld seams 111b Bubble holes are formed due to the gaseous substance produced and remaining within them. As a result, it would be possible to achieve high weld strength. 111b to ensure.

[0128] According to the first to sixth embodiments, the end sections of the electrical conductors 111d arranged such that, when along the axial direction of the starter core 110 (or along the direction perpendicular to the end surfaces of the end sections), the longitudinal direction of each of the slots that are in the end sections of the electrical conductors 111dare shaped perpendicular to a radial direction of the stator core 110 is. However, as is stated in Fig. As shown in 40, the end sections of the electrical conductors 111d alternatively, be arranged such that, when along the axial direction of the starter core 110 Considering the longitudinal direction of each of the slots located in the end sections of the electrical conductors 111d are formed parallel to a radial direction of the starter core 110 In this case, it is possible to use each pair of the end sections of the electrical conductors. 111d along the longitudinal direction of the slots 111e , which are formed within it, to weld together, while the welding torch T moves in the radial direction of the starter core 110 is being moved.

[0129] According to the first to sixth embodiments, the present invention relates to the rotating electric machine 1The present invention is aimed at a device configured as a motor-generator for use in a motor vehicle. However, the present invention can also be applied to other rotating electrical machines such as an electric motor or an electric generator.

[0130] As described above, a rotating electrical machine comprises a pair of electrical conductors forming a coil and a weld. Each of the electrical conductors has an end section with an end surface. The weld is formed between the end sections of the electrical conductors at the end surfaces of the end sections. Furthermore, the end sections of the electrical conductors are arranged such that portions of the end sections of the electrical conductors are adjacent to one another. At least one of the end sections of the electrical conductors has at least one slot formed therein to divide the end surface of the end section into a plurality of sections. The weld is formed to cover at least the adjacent portions of the end sections of the electrical conductors and the at least one slot. QUOTES INCLUDED IN THE DESCRIPTION

[0131] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0132] JP 2016-42298

[0001] JP 3303854 B2

[0004]

Claims

[1] Rotating electric machine with a pair of electrical conductors to form a coil, each of the electrical conductors having an end section with an end surface, and a weld seam formed between the end sections of the electrical conductors at the end surfaces of the end sections, where the end sections of the electrical conductors are arranged in such a way that parts of the end sections of the electrical conductors are adjacent to each other, at least one of the end sections of the electrical conductor has at least one slot formed therein to divide the end surface of the end section into a plurality of sections, and The weld is formed to cover at least the adjacent parts of the end sections of the electrical conductors and at least one slot. [2] Rotating electrical machine according to claim 1, wherein at least one of the end sections of the electrical conductors has a plurality of slots formed therein to divide the end surface of the end section into three or more sections. [3] Rotating electric machine according to claim 1, wherein of the plurality of sections of the end surfaces which is divided by the at least one slot, a middle section has a smaller area than an outer section, wherein the middle section is located closer than the outer section to a boundary between the end sections of the electrical conductors. [4] Rotating electric machine according to claim 3, wherein at least one of the end sections of the electrical conductors has a plurality of slots formed therein to divide the end surface of the end section into three or more sections, and areas of the sections of the end surfaces rise in a direction away from the boundary between the end sections of the electrical conductors. [5] Rotating electrical machine according to claim 1, wherein each of the electrical conductors consists of a plurality of electrical conductor wires arranged to butt into each other. [6] Rotating electric machine according to claim 5, wherein each of the electrical conductor wires has an end surface and the end surfaces of the electrical conductor wires together form the end surface of the electrical conductor, and the surfaces of the end surfaces of the electrical conductor wires differ from each other. [7] Rotating electrical machine according to claim 5, wherein at least one slot is formed between the plurality of electrical conductor wires. [8] Rotating electric machine according to claim 1, further comprising an annular core holding the coil, where the electrical conductors are arranged such that the end sections of the electrical conductors project from an axial end face of the core, and a longitudinal direction of at least one slot is perpendicular to a radial direction of the core. [9] Method for manufacturing a rotating electrical machine, the method comprising the steps: Preparing a pair of electrical conductors to form a coil of the rotating electric machine, each of the electrical conductors having an end section with an end surface, Forming at least one slot in at least one of the end sections of the electrical conductors to divide the end surface of the end section into a plurality of sections, Arranging the end sections of the electrical conductors such that parts of the end sections of the electrical conductors are adjacent to each other, and Welding the end sections of the electrical conductors to their end surfaces to form a weld that covers at least the adjacent parts of the end sections and at least one slot. [10] Method according to claim 9, wherein in the formation step a plurality of slots are formed in at least one of the end sections of the electrical conductors to divide the end surface of the end section into three or more sections. [11] Method according to claim 9, wherein in the formation step the at least one slot is formed such that of the plurality of sections of the end surface which is divided by the at least one slot, a middle section has a smaller area than an outer section, wherein the middle section is arranged closer than the outer section to a boundary between the end sections of the electrical conductor in the subsequent arrangement step. [12] Method according to claim 11, wherein in the formation step a plurality of slots are formed in the at least one of the end sections of the electrical conductors to divide the end surface of the end section into three or more sections, and the plurality of slots are formed in the formation step, and the end sections of the electrical conductors are arranged in the arrangement step such that areas of the sections of the end surfaces increase in a direction away from the boundary between the end sections of the electrical conductors. [13] Method according to claim 9, wherein each of the electrical conductors prepared in the preparation step consists of a plurality of electrical conductor wires arranged such that they are adjacent to one another. [14] Method according to claim 13, wherein each of the electrical conductor wires has an end surface and the end surfaces of the electrical conductor wires together form the end surface of the electrical conductor, and the surfaces of the end surfaces of the electrical conductor wires differ from each other. [15] Method according to claim 13, wherein in the formation step at least one slot is formed between the plurality of electrical conductor wires. [16] Method according to claim 9, wherein in the arrangement step the electrical conductors are mounted to an annular core of the rotating electrical machine and are arranged such that the end sections of the electrical conductors project from an axial end face of the core and a longitudinal direction of the at least one slot is perpendicular to a radial direction of the core.

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