Rotating electrical machines and stators for internal combustion engines

Abstract

The present invention relates to a rotating electric machine for an internal combustion engine and a stator thereof. The stator (31) of the rotating electric machine for an internal combustion engine includes a stator core (32). The stator core (32) has a plurality of magnetic poles (32a) and an annular portion (32b). A stator coil (33) is mounted on the plurality of magnetic poles (32a). A plurality of coil ends (33a) extending from the stator coil (33) to the top of the annular portion (32b) extend from between the single coils (33b). The plurality of coil ends (33a) extend from the radial outside to the radial inside and extend in one direction along the circumferential direction. The plurality of coil ends (33a) are in a spiral shape extending from the radial outside to the radial inside and in a clockwise direction. The plurality of coil ends (33a) are connected to a neutral point electrode (52) and / or an output end electrode (62).

Description

[0001] This application is a divisional application of the Chinese invention patent application with the application date of December 5, 2017, application number 201780072380.1, and invention name “Rotating electric machine and stator for internal combustion engine”.

[0002] Cross-references to related applications

[0003] This application is based on Japanese Patent Application No. 2016-236988 filed on December 6, 2016, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0004] The disclosure in this specification relates to a rotating electric machine for an internal combustion engine and a stator thereof. Background Art

[0005] Patent document 1 discloses a rotating electric machine for an internal combustion engine. Patent document 1 discloses a welding portion for an output terminal of the rotating electric machine. Three welding portions for the output terminal are arranged within a fan-shaped range of the rotating electric machine. In the three welding portions, a plate-shaped tab is arranged to extend in the radial direction. In other words, the plate-shaped tab is arranged to face the circumferential direction.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: International Publication No. 2016 / 129287 Summary of the invention

[0009] Problems to be solved by the invention

[0010] One view is that the prior art structure sometimes cannot allow for slight movement of the coil end during the welding process. For example, when the end of the coil is pressed onto the terminal for welding, the end of the coil may move axially or translate. Therefore, it is desirable to provide a predetermined length of deformation allowance near the welding portion. For example, to form the deformation allowance, it is desirable to lay the end of the coil near the welding portion to a predetermined length.

[0011] There is another view that the coil end near the welding part sometimes has a hook-shaped part. However, the hook-shaped part has disadvantages. For example, when the wire material of the coil is thick, it is sometimes difficult to form the hook-shaped part. Moreover, for example, the hook-shaped part at the coil end sometimes hinders the slight movement of the coil end.

[0012] There is also a view that in the structure of the prior art, the coil end extends in the radial direction of the stator. On the other hand, the cooling medium such as air will flow along the circumferential direction of the stator as the rotor rotates. Therefore, the coil end will hinder the flow of the cooling medium.

[0013] There is also a view that the shape and extension angle of the coil end near the welding portion may be unstable due to processing errors, etc. Therefore, it is ideal to allow the terminal to be connected to the coil end with slight shape errors and angle errors.

[0014] There is also a view that it is difficult to connect the ends of a plurality of coils to one terminal with the structure of the prior art.

[0015] From the above viewpoints or other viewpoints not mentioned, further improvements are required in the rotating electrical machine for an internal combustion engine and the stator thereof.

[0016] An object of the present disclosure is to provide a rotating electrical machine for an internal combustion engine and a stator thereof that is easy to manufacture.

[0017] Another object of the present disclosure is to provide a rotating electrical machine for an internal combustion engine having a smooth shape change in the circumferential direction and a stator thereof.

[0018] Solution

[0019] The stator of a rotating electric machine for an internal combustion engine disclosed herein comprises: a stator core (32) having a plurality of magnetic poles (32a) and an annular portion (32b) connecting the plurality of magnetic poles; and a stator coil (33) comprising a plurality of single coils (33b) arranged on the plurality of magnetic poles; wherein at least one of the plurality of coil ends (33a) of the stator coil extends from the stator coil toward the top of the annular portion, inclined relative to the radial direction of the stator core, and a terminal (54, 65) connected to the coil end inclined relative to the radial direction of the stator core is provided on the annular portion.

[0020] According to the stator of the rotating electric machine for an internal combustion engine disclosed in the present invention, the plurality of coil ends are given a relatively long length. Therefore, the plurality of coil ends can be given a length including a deformation margin. Therefore, manufacturing becomes easy.

[0021] The stator of a rotating electric machine for an internal combustion engine disclosed herein comprises: a stator core (32) having a plurality of magnetic poles (32a) and an annular portion (32b) connecting the plurality of magnetic poles; and a stator coil (33) comprising a plurality of single coils (33b) arranged on the plurality of magnetic poles; wherein the plurality of coil ends (33a) of the stator coil are inclined in a circumferential direction and extend in a spiral shape from the stator coil toward the upper side of the annular portion.

[0022] According to the stator of the rotating electric machine for an internal combustion engine disclosed in the present invention, the plurality of coil ends are given a relatively long length. Therefore, the plurality of coil ends can be given a length including a deformation margin. Therefore, manufacturing becomes easy.

[0023] The stator of a rotating electric machine for an internal combustion engine disclosed in the present invention comprises: a stator core (32) having a plurality of magnetic poles (32a) and an annular portion (32b) connecting the plurality of magnetic poles; and a stator coil (33) comprising a plurality of single coils (33b) arranged on the plurality of magnetic poles; wherein the stator coil comprises: a plurality of coil ends (33a) extending from above the magnetic poles to above the annular portion; and columnar terminals (54, 65) arranged on the annular portion, intersecting and extending with the coil ends, and contacting and connecting with the coil ends.

[0024] According to the stator of the rotating electric machine for an internal combustion engine disclosed in the present invention, the columnar coil end receives and connects the coil ends extending at various angles by intersecting with the coil ends, thereby facilitating manufacturing.

[0025] The rotary electric machine for an internal combustion engine disclosed in the present invention comprises: a stator (31) of the rotary electric machine for an internal combustion engine; and a rotor (21) which spans the end surface and radially outer side of the stator and is supported rotatably relative to a plurality of magnetic poles.

[0026] When the plurality of coil ends are arranged on the end surface of the stator and face the rotor, the plurality of coil ends extend smoothly in the circumferential direction. Since the plurality of coil ends are given smooth shape changes in the circumferential direction, drastic changes in fluidity, magnetism or electrical properties are resisted.

[0027] The various embodiments disclosed in this specification use different technical means to achieve their respective purposes. The scope of the claims and the reference numerals in brackets recorded in the claims are only exemplary of the correspondence with the embodiments described later, and are not intended to limit the scope of protection. By referring to the following detailed description and drawings, the purposes, features and effects disclosed in this specification will be more clearly understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view showing the rotating electrical machine for the internal combustion engine in the first embodiment.

[0029] Figure 2 1 is a circuit diagram showing a stator coil in the first embodiment.

[0030] Figure 3 It is a plan view showing the stator in the first embodiment.

[0031] Figure 4 It is a perspective view showing the stator in the first embodiment.

[0032] Figure 5 This is an enlarged view showing the stator in the first embodiment.

[0033] Figure 6 It is a perspective view showing the neutral point electrode according to the first embodiment.

[0034] Figure 7 It is a plan view showing the neutral point electrode of the first embodiment.

[0035] Figure 8 1 is a partial plan view showing a stator in the first embodiment.

[0036] Fig. 9 1 is a plan view showing the neutral point connection of the first embodiment.

[0037] Fig.10 1 is a plan view showing the neutral point connection of the second embodiment.

[0038] Fig.11 1 is a plan view showing a neutral point connection according to a third embodiment.

[0039] Fig.12 1 is a plan view showing a neutral point connection according to a fourth embodiment.

[0040] Fig.13 1 is a plan view showing a neutral point connection according to a fifth embodiment.

[0041] Fig.14 1 is a side view showing a neutral point electrode according to the sixth embodiment.

[0042] Fig.15 It is a plan view showing a neutral point electrode according to the sixth embodiment.

[0043] Fig.16 1 is a plan view showing a neutral point connection according to the sixth embodiment.

[0044] Fig.17 1 is a plan view showing a neutral point connection according to the seventh embodiment. DETAILED DESCRIPTION

[0045] In the following, various embodiments are described in conjunction with the drawings of the specification. In various embodiments, functionally and / or structurally corresponding parts and / or associated parts are sometimes marked with the same reference numerals, or marked with reference numerals that differ only in the digits above the hundredth place. For corresponding parts and / or associated parts, reference can be made to the descriptions in other embodiments.

[0046] First embodiment

[0047] Figure 1A power system 10 for an internal combustion engine is shown. The power system 10 includes a rotating electric machine 11 for an internal combustion engine (hereinafter referred to as the rotating electric machine). A cross section of the rotating electric machine 11 is shown in the figure. The rotating electric machine 11 is assembled in an internal combustion engine 12. The internal combustion engine 12 includes: a body 13; and a rotating shaft 14, which is rotatably supported by the body 13 and rotates in conjunction with the internal combustion engine 12. The rotating electric machine 11 is assembled on the body 13 and the rotating shaft 14. The body 13 is a structural body such as a crankcase and a gearbox of the internal combustion engine 12. The rotating shaft 14 is the crankshaft of the internal combustion engine 12, or a rotating shaft that rotates in conjunction with the crankshaft. The rotating shaft 14 rotates as the internal combustion engine 12 runs, and drives the rotating electric machine 11 to function as a generator. When the rotating electric machine 11 is used as an electric motor, the rotating shaft 14 is driven to rotate by the rotating electric machine 11.

[0048] The power system 10 has a circuit (CNT) 15 for causing the rotating electric machine 11 to function as a generator and / or a motor. The circuit 15 includes an inverter circuit and a control device. The rotating electric machine 11 and the circuit 15 are connected via a power line 16. When the rotating electric machine 11 functions as a generator, the power line 16 outputs the generated power to the circuit 15. When the rotating electric machine 11 functions as a motor, the circuit 15 supplies power to the power line 16. The rotating electric machine 11 and the circuit 15 are connected via a signal line 17. The signal line 17 outputs a reference position signal of the rotating electric machine 11 and / or a rotational position signal of the rotating electric machine 11 to the circuit 15. The control device performs control using the signal obtained by the signal line 17 so that the rotating electric machine 11 functions as a motor.

[0049] The rotating electric machine 11 is electrically connected to an electric load (LD) 18 via an electric circuit 15. The load 18 includes an electric circuit and a battery. One application example of the rotating electric machine 11 is a generator driven by a vehicle internal combustion engine 12. The rotating electric machine 11 can be used in a saddle-type vehicle, for example. Another application example of the rotating electric machine 11 is an electric motor that assists a vehicle internal combustion engine 12.

[0050] The rotating electric machine 11 includes a rotor 21 and a stator 31. The rotor 21 is an excitation element. The stator 31 is an armature. The rotor 21 is cup-shaped as a whole. The rotor 21 is positioned so that its open end faces the body 13. The rotor 21 is a member extending across the end surface and radially outward of the stator 31. The rotor 21 is fixed to the end of the rotating shaft 14. The rotor 21 and the rotating shaft 14 are connected by a positioning mechanism such as a key fit in the rotation direction. The rotor 21 is fixed by being fastened to the rotating shaft 14 by a fixing bolt. The rotor 21 rotates together with the rotating shaft 14. The rotor 21 is supported rotatably relative to a plurality of magnetic poles provided on the stator 31 described later.

[0051] The rotor 21 has a cup-shaped rotor core 22. The rotor core 22 is connected to the rotating shaft 14 of the internal combustion engine 12. The rotor core 22 provides a yoke for a permanent magnet 23 described later. The rotor core 22 is made of a magnetic metal.

[0052] The rotor 21 has a permanent magnet 23 disposed on the inner surface of the rotor core 22. The rotor 21 provides a field magnet through the permanent magnet 23. The permanent magnet 23 is fixed to the inner side of the cylinder of the rotor core 22. The permanent magnet 23 has a plurality of segments. Each segment is partially cylindrical. The permanent magnet 23 provides a plurality of N poles and a plurality of S poles on its inner side. The permanent magnet 23 provides at least a magnetic field. The permanent magnet 23 provides six pairs of N poles and S poles, i.e., a 12-pole field magnet, through 12 segments. The number of magnetic poles may also be other numbers.

[0053] The stator 31 is an annular component. The stator 31 is arranged between the rotor 21 and the body 13. The stator 31 has an outer peripheral surface opposite to the inner surface of the rotor 21 with a gap therebetween. A plurality of magnetic poles are arranged on the outer peripheral surface. The magnetic poles are also called teeth. The stator 31 has, for example, eighteen magnetic poles 36. The number of magnetic poles can also be other numbers. These magnetic poles are arranged to be opposite to the field magnets of the rotor 21. The stator 31 has an armature winding. The stator 31 has a multi-phase armature winding. The stator 31 is fixed to the body 13. The stator 31 is a three-phase multi-pole stator having a plurality of magnetic poles and a plurality of three-phase windings.

[0054] The stator 31 has a stator core 32. The stator core 32 is fixed to the body 13 of the internal combustion engine 12 and arranged on the inner side of the rotor 21. The stator core 32 forms a plurality of magnetic poles on the radially outer side facing the inner surface of the permanent magnet 23. The stator core 32 has an annular portion connecting the plurality of magnetic poles. The stator core 32 is fixed to the body 13 at the annular portion. The stator core 32 is formed by laminating electromagnetic steel sheets formed into a predetermined shape to form a plurality of magnetic poles.

[0055] The stator 31 has a stator coil 33 wound around a stator core 32. The stator coil 33 provides an armature winding. An insulator made of an insulating material is arranged between the stator core 32 and the stator coil 33. The insulator is also called a bobbin. A portion of the insulator is positioned adjacent to the magnetic pole, thereby providing a flange portion of the bobbin. A portion of the insulator is arranged on both axial sides of the magnetic pole. The insulator is also exposed to the annular portion of the stator core 32.

[0056] The stator 31 has a neutral point 51 including a plurality of components for providing a neutral point connection. A plurality of coil ends 33a extending from the stator coil 33 are configured to reach the neutral point 51. The stator 31 has an output terminal 61 including a plurality of components for providing a connection to the power line 16. A plurality of coil ends 33a extending from the stator coil 33 are configured to reach the output terminal 61.

[0057] exist Figure 2 In the embodiment, the stator coil 33 is a multi-phase winding. The stator coil 33 is a three-phase winding. The stator coil 33 has a plurality of phase coils 33u, 33v, and 33w. Each phase coil may have a plurality of coils connected in parallel. Each of the plurality of phase coils 33u, 33v, and 33w has coil ends 33a, 33a at both ends thereof. In addition, the coil end 33a is the portion where the winding of each of the plurality of phase coils 33u, 33v, and 33w starts and ends. The coil end 33a is also referred to as the excess wire portion of the wire material providing the stator coil 33.

[0058] The stator coil 33 is formed of a single wire conductor covered with an insulating film. The wire forming the stator coil 33 is made of aluminum or an aluminum alloy. The stator coil 33 can be provided by a plurality of wires connected in parallel. In addition, the wire can also be made of copper or a copper alloy.

[0059] The stator coil 33 is star-connected. The stator coil 33 has a neutral point 51 and an output terminal 61. The neutral point 51 has a neutral point electrode 52. The neutral point electrode 52 has a plurality of terminals 54. Each of these terminals 54 is connected to the coil end 33a.

[0060] The output terminal 61 has three output terminal electrodes 62, 63, 64. Each output terminal electrode 62, 63, 64 is connected to one of the plurality of coil terminals 33a. One output terminal electrode has one terminal 65. The figure shows the terminal 65 of the output terminal electrode 62. At least one coil terminal 33a is connected to one terminal 54.

[0061] Figure 3 A plan view of a stator 31 is shown. The stator core 32 has a plurality of magnetic poles 32a and an annular portion 32b. The plurality of magnetic poles 32a extend in the radial direction. The stator coil 33 is mounted on the plurality of magnetic poles 32a. On one magnetic pole 32a, a single coil 33b as a part of the stator coil 33 is mounted. In the example shown in the figure, eighteen single coils 33b are provided. Therefore, the stator coil 33 is also a collection of a plurality of single coils 33b.

[0062] The plurality of magnetic poles 32a are connected by an annular portion 32b. The annular portion 32b has a plurality of fixing portions 32c. The plurality of fixing portions 32c are defined by bolt holes and seats around the bolt holes. In the illustrated embodiment, three fixing portions 32c are provided.

[0063] The neutral point 51 is provided on the annular portion 32b. The neutral point 51 is provided between two fixing portions 32c adjacent to each other in the circumferential direction. The neutral point electrode 52 provides the neutral point 51 for star connection. The neutral point electrode 52 is in the shape of a plate extending in the circumferential direction.

[0064] A portion of the insulator 34 is exposed on the annular portion 32b. The insulator 34 provides a bottom surface 35 of a container surrounding the neutral point electrode 52. An insulating resin (not shown) is provided around the neutral point electrode 52. The insulating resin is a protective member that covers and protects the electrically exposed portion on the neutral point electrode 52. The insulator 34 has a groove 36 for accommodating the neutral point electrode 52.

[0065] The output end 61 is provided on the annular portion 32 b. The output end 61 is provided between two fixing portions 32 c adjacent to each other in the circumferential direction. The output end 61 is in the shape of a plate extending in the axial direction so as to penetrate the stator core 32 .

[0066] A portion of the insulator 34 is exposed on the annular portion 32b. The insulator 34 provides the bottom surface of the container surrounding the output terminal electrodes 62, 63, 64. An insulating resin not shown in the figure is provided around the output terminal electrodes 62, 63, 64. The insulating resin is a protective member that covers and protects the electrically exposed portion of the output terminal electrodes 62, 63, 64. The insulator 34 has a through portion extending through the stator core 32. The output terminal electrodes 62, 63, 64 are provided in the through portion. Therefore, the output terminal electrodes 62, 63, 64 are insulated from the stator core 32.

[0067] The plurality of coil ends 33a extend radially inward from the stator coil 33 and reach the neutral point 51 or the output end 61. The plurality of coil ends 33a are inclined on the end surface of the stator 31 and extend in a direction pointing in the circumferential direction. In other words, the plurality of coil ends 33a extend in a spiral shape. The plurality of coil ends 33a extend in a spiral shape on the stator coil 33. Further, the plurality of coil ends 33a extend in a spiral shape on the annular portion 32b. The plurality of coil ends 33a are inclined in the same direction in the circumferential direction and extend in a spiral shape from the stator coil 33 toward the top of the annular portion 32b.

[0068] In the illustrated example, all coil ends 33a are inclined in a clockwise direction from the radial outside to the radial inside. Parts of the multiple coil ends 33a are covered with insulating resin, varnish, or adhesive. However, the inclination of the multiple coil ends 33a is manifested in their surface shape. The spiral inclination of the multiple coil ends 33a is along the rotation direction of the rotating motor 11. The end face shown in the figure is the end face opposite to the rotor 21. In other words, the end face shown in the figure is opposite to the bottom surface of the cup-shaped rotor 21. Therefore, in the illustrated example, the multiple coil ends 33a are arranged in a spiral shape on the end face opposite to the rotor 21. In addition, the end face can also face the fixed fuselage 13.

[0069] The following will be explained by taking the coil end 33a on the right side of the lower part in the figure as an example. The coil end 33a extends from the corresponding single coil 33b. The coil end 33a extends circumferentially along the top of the stator coil 33 on the opposite end face of the stator 31. The coil end 33a extends axially at the radial inner part of a slot 32d. The coil end 33a passes through the slot 32d and appears on the end face shown in the figure. This end face is an end face configured with a connection portion for the neutral point 51 and / or the output end 61. The coil end 33a extends radially inward on the end face shown in the figure toward the output end 61. In addition, the coil end 33a is inclined and extends relative to the radial direction of the stator 31.

[0070] A flow of a cooling medium such as air or oil may sometimes occur along the rotation direction of the rotating electric machine 11. The spiral inclination of the plurality of coil ends 33a allows the cooling medium to flow smoothly.

[0071] Figure 4 The figure shows a three-dimensional view of the stator 31. The plurality of coil ends 33a are in a spiral shape pointing toward the neutral point 51 and / or the output end 61 and in one direction of the circumferential direction. The plurality of coil ends 33a may also be shown as ridges on the plurality of coil ends 33a.

[0072] Figure 5 An enlarged view of the vicinity of the neutral point 51 is shown. The insulator 34 forms a terminal block that can be called a trapezoidal or fan-shaped terminal block between two circumferentially adjacent fixing portions 32c, 32c. In the bottom surface 35, the groove 36 is open. The groove 36 is wavy. The groove 36 has five straight portions. The five straight portions of the groove 36 are connected to form a continuous groove 36 through an obtuse connecting portion.

[0073] The neutral point electrode 52 has a common portion 53 and a plurality of terminals 54. The common portion 53 connects the plurality of terminals 54. At least a portion of the common portion 53 is accommodated in the groove 36. The common portion 53 is wavy. The common portion 53 has a shape corresponding to the shape of the groove 36. The plurality of terminals 54 include three terminals 54a, 54b, and 54c. In the following description, the terminals 54a, 54b, and 54c are used to distinguish one of them.

[0074] One coil end 33a is connected to one terminal 54. In the illustrated example, three coil ends 33a are connected to three terminals 54. The insulator 34 has guides 37 and 38 for guiding the coil ends 33a. The guides 37 and 38 may have a holding function for holding the coil ends 33a. The guides 37 and 38 are arranged on the annular portion 32b. The guides 37 and 38 guide the plurality of coil ends 33a along a predetermined shape by receiving the plurality of coil ends 33a.

[0075] Figure 6The figure is a three-dimensional diagram showing the neutral point electrode 52. The neutral point electrode 52 is made of a conductive metal suitable for connection to the stator coil 33. The neutral point electrode 52 is plate-shaped. The neutral point electrode 52 is manufactured by a manufacturing method including a metal plate stamping process. The manufacturing method may also include a cutting process of cutting the metal plate. The manufacturing method includes a process of processing the metal plate into a predetermined shape. The manufacturing method includes a process of forming a convex strip described later on the metal plate. Further, the manufacturing method includes a bending process of bending the metal plate to give it a predetermined shape. In the bending process, a plurality of bends are formed with an inner angle of the bend being greater than 90 degrees. In the bending process, a plurality of bends are formed. The plurality of bends position the plurality of terminals 54 to extend radially outward of the stator 31, rather than being positioned parallel to each other.

[0076] A plurality of terminals 54 extend from the common portion 53. The plurality of terminals 54 protrude in a tooth shape relative to the common portion 53. The plurality of terminals 54 extend from the common portion 53 along the axial direction of the stator 31 to protrude from the insulator 34. The neutral point electrode 52 has a fixing portion 55. The fixing portion 55 extends from the common portion 53. The fixing portion 55 extends toward the inside of the stator core 32 along the axial direction of the stator 31 together with the insulator 34. The fixing portion 55 is fixed to the insulator 34.

[0077] Each of the plurality of terminals 54 has a convex strip 56. The convex strip 56 is a semi-cylindrical protrusion formed on the terminal 54. The convex strip 56 has a ridgeline extending in the axial direction of the stator 31. The ridgeline defines an axis AX56. The terminal 54a has a convex strip 56a. The terminal 54b has a convex strip 56b. The terminal 54c has a convex strip 56c.

[0078] Figure 7 : is a plan view showing the neutral point electrode 52. The neutral point electrode 52 has a plurality of bends Bd. When it is necessary to distinguish the plurality of bends Bd, bends Bd1, Bd2, Bd3, and Bd4 are used. The bends Bd are formed by bending a flat plate. In the bends Bd, the inner side of the bend shape is an obtuse angle. That is, the bending deformation amount of the bends Bd is shallow. Such shallow bending processing helps to simplify the manufacturing method.

[0079] A plurality of bends Bd are formed between two adjacent terminals 54. There is at least one bend Bd that is concave downward in the figure and at least one bend Bd that is convex upward in the figure between two adjacent terminals 54. The neutral point electrode 52 has a plurality of concave folds and a plurality of convex folds. The concave folds and the convex folds are alternately arranged along the circumference of the stator 31. For example, there are two bends Bd1 and Bd2 between the terminal 54a and the terminal 54b. The surfaces of the two adjacent terminals 54 are non-parallel to each other. The surfaces of the two adjacent terminals 54 are inclined to each other. Between the surfaces of the two adjacent terminals 54, a gap is defined that extends radially outward of the stator 31.

[0080] If the terminal 54 is regarded as a plane, a plane passing through the terminal 54 can be assumed. For example, the plane PL54a where the terminal 54a is located can be assumed. Similarly, the plane PL54b where the terminal 54b is located can be assumed. The plane PL54c where the terminal 54c is located can be assumed. The plane PL54a, the plane PL54b, and the plane PL54c are planes. In the following description, the clockwise direction is the positive direction.

[0081] There are a bend Bd1 and a bend Bd2 between the surface PL54a and the surface PL54b. The bend Bd1 has an inner angle Rb1 in the bending direction starting from the flat plate. The bend Bd2 has an inner angle Rb2 in the bending direction starting from the flat plate. The difference between the two inner angles is greater than 0 degrees (Rb1-Rb2≧0). There is an expansion angle Rw1 between the surface PL54a and the surface PL54b. The difference between the two inner angles is equivalent to the expansion angle. The gap between the surface PL54a and the surface PL54b expands radially outward of the stator 31. The inner angle Rb1 is greater than 90 degrees (Rb1≧90). The inner angle Rb2 is greater than 90 degrees (Rb2≧90). The inner angle Rb1 and the inner angle Rb2 are obtuse angles.

[0082] There are a bend Bd3 and a bend Bd4 between the surface PL54b and the surface PL54c. The bend Bd3 has an inner angle Rb3 in the bending direction starting from the flat plate. The bend Bd4 has an inner angle Rb4 in the bending direction starting from the flat plate. The difference between the two inner angles is greater than 0 degrees (Rb3-Rb4≧0). There is an expansion angle Rw2 between the surface PL54b and the surface PL54c. The difference between the two inner angles is equivalent to the expansion angle. The gap between the surface PL54b and the surface PL54c expands radially outward of the stator 31. The inner angle Rb3 is greater than 90 degrees (Rb3≧90). The inner angle Rb4 is greater than 90 degrees (Rb4≧90). The inner angle Rb3 and the inner angle Rb4 are obtuse angles.

[0083] A plane parallel to the plane of the terminal 54 and passing through the vertex of the convex strip 56 can be assumed. This plane is tangent to the convex strip 56. The surface PL54a is parallel to the surface PL56a passing through the vertex of the convex strip 56a. Even when the convex strip 56a is not circular, a surface that can be called tangent to the convex strip 56a can be assumed. The surface PL54b is parallel to the surface PL56b passing through the vertex of the convex strip 56b. The surface PL56c is parallel to the surface PL56c passing through the vertex of the convex strip 56c. The relationship that holds between the three surfaces PL54a, PL54b and PL56c also holds between the three surfaces PL56a, PL56b and PL56c.

[0084] The neutral point electrode 52 has a first connection portion 57 connecting the terminal 54a and the terminal 54b. The neutral point electrode 52 also has a second connection portion 58 connecting the terminal 54b and the terminal 54c. The angle formed by the axis of the first connection portion 57 relative to the surface PL54a or the surface PL56a is greater than 90 degrees. The angle formed by the axis of the first connection portion 57 relative to the surface PL54a or the surface PL56a is less than 180 degrees. The angle formed by the axis of the second connection portion 58 relative to the surface PL54a or the surface PL56a is greater than 90 degrees. The angle formed by the axis of the second connection portion 58 relative to the surface PL54a or the surface PL56a is less than 180 degrees.

[0085] Figure 8 is equivalent to Figure 5 . The position of the neutral point electrode 52 on the stator 31 is shown. The neutral point electrode 52 is arranged on the annular portion 32b in the circumferential direction. The neutral point electrode 52 has a plurality of terminals 54 separated from each other in the circumferential direction. The neutral point electrode 52 has a plurality of bends Bd providing convex and concave bends between two circumferentially adjacent terminals 54. In other words, a plurality of terminals 54, 65 connected to a plurality of coil ends 33a are arranged on the annular portion 32b. The coil end 33a corresponding to one terminal 54, 65 extends along the surface of its terminal 54, 65.

[0086] The convex strips 56a and 56b are formed to protrude from the same surface of the material of the neutral point electrode 52. The curved portion Bd1 and the curved portion Bd2 are curved portions with opposite directions. That is, the curved portion Bd1 has a concave radial outer side surface and a convex radial inner side surface. The curved portion Bd2 has a convex radial outer side surface and a concave radial inner side surface.

[0087] The convex strip 56b and the convex strip 56c are formed to protrude from the same surface of the material of the neutral point electrode 52. The curved portion Bd3 and the curved portion Bd4 are curved portions with opposite directions. That is, the curved portion Bd3 has a concave radial outer side surface and a convex radial inner side surface. The curved portion Bd4 has a convex radial outer side surface and a concave radial inner side surface.

[0088] As a result, the plurality of protrusions 56a, 56b, 56c slightly protrude radially inward. In other words, the plurality of terminals 54a, 54b, 54c are inclined so that the protrusions 56a, 56b, 56c thereof are directed radially inward.

[0089] In the figure, planes PL56a, PL56b, and PL56c are shown which are parallel to the terminal 54 and pass through the vertex of the convex strip 56. The manufacturing method of the stator includes a process of installing the neutral point electrode 52 on the stator 31. The neutral point electrode 52 is fixed to the insulator 34 or the stator core 32. After this process, a process of laying a plurality of coil ends 33a is included. The plurality of coil ends 33a are mounted to the guide portions 37 and 38 and are arranged on the convex strip 56 of the terminal 54 at the same time. The plurality of coil ends 33a are laid from the radial outer side to the radial inner side and are inclined in the clockwise direction. The coil end 33a is arranged on the convex strip 56 of the terminal 54 so as to intersect with the axis AX56. After this process, the coil end 33a and the terminal 54 are joined together. In this embodiment, projection welding is used. When performing projection welding, the coil end 33a and the terminal 54 are located between the welding electrodes, and while mechanical pressure is applied, an electric current is applied to join the two. In addition, a process called welding or electric welding can also be used.

[0090] The guide portion 37 provides a reference surface for positioning the coil end 33a. The coil end 33a is positioned at a normal position by contacting the guide portion 37. The guide portion 37 is provided at a boundary portion above the stator coil 33 and above the annular portion 32b. The coil end 33a is positioned toward the terminal 54 at the guide portion 37. The guide portion 37 provides a reference surface for bending the coil end 33a. The coil end 33a can be slightly bent at the guide portion 37. The insulator 34 has a guide portion 37 that connects the coil end 33a to the terminal 54a. The insulator 34 has a guide portion 37 that connects the coil end 33a to the terminal 54b. The insulator 34 has a guide portion 37 that connects the coil end 33a to the terminal 54c.

[0091] The guide portion 38 provides a reference surface for positioning the coil end 33a. The guide portion 38 is arranged on the annular portion 32b. The coil end 33a is positioned at a normal position by contacting the guide portion 38. The coil end 33a is positioned to contact the top of the protrusion 56 of the terminal 54 by contacting the guide portion 38. The coil end 33a is not bent at the guide portion 38. The insulator 34 does not have a guide portion 38 for connecting the coil end 33a to the terminal 54a. This is because the guide portion 37 and the terminal 54a are closer. The insulator 34 has a guide portion 38 for connecting the coil end 33a to the terminal 54b. The insulator 34 has a guide portion 38 for connecting the coil end 33a to the terminal 54c.

[0092] In the manufacturing method, the guides 37 and 38 may sometimes provide a fixing portion for fixing the coil end 33a. Before the coil end 33a is welded to the terminal 54, and during the welding process, the guides 37 and 38 position the coil end 33a above the terminal 54.

[0093] The coil end 33a extends parallel to the planes PL56a, PL56b, and PL56c on the terminal 54. For example, the coil end 33a connected to the terminal 54a extends along the plane PL56a. The coil end 33a extends parallel to the planes PL56a, PL56b, and PL56c above the annular portion 32b. The coil end 33a extends straight from the guide portion 37.

[0094] The plurality of coil ends 33a are substantially straight above the annular portion 32b. Therefore, slight movement of the coil ends 33a is allowed in the manufacturing method. Moreover, the straight coil end 33a does not need to be processed into a hook shape close to 90 degrees. Therefore, thick wires can be used for the stator coils.

[0095] In the figure, multiple axes AX32(n) provided by multiple magnetic poles 32a are shown. Here, n is a natural number. The axis AX32(n) corresponds to the radial direction of the stator 31. The multiple axes AX32(n) are radial relative to the stator 31. The neutral point electrode 52 is set within the range of 5 magnetic poles 32a. The neutral point electrode 52 extends between the axis AX32(1) and the axis AX32(5).

[0096] All of the plurality of terminals 54 are positioned so that their faces are inclined relative to the radial direction. For example, the terminal 54a has a face perpendicular to the stator 31. The terminal 54a is parallel to the plane PL56a. The plane PL56a is inclined in the clockwise direction, which is one direction of the circumferential direction, from the radial outer side toward the radial inner side. Therefore, the terminal 54a is inclined in the clockwise direction, which is one direction of the circumferential direction, from the radial outer side toward the radial inner side. The same is true for the terminals 54b and 54c.

[0097] All of the plurality of terminals 54 have a plane extending along the coil end 33a and a convex strip 56 that contacts and connects to the coil end 33a. For example, the terminal 54a has the convex strip 56 on a portion of the plane extending along the coil end 33a. In other words, two plane portions are located on both sides of the convex strip 56. The same is true for the terminal 54b and the terminal 54c.

[0098] With respect to the direction in which planes PL56a, PL56b, and PL56c extend radially outward, planes PL56a, PL56b, and PL56c intersect with the preceding axis AX32(n). That is, terminal 54a is provided between axis AX32(1) and axis AX32(2). Plane PL56a intersects with axis AX32(1) in the region above stator 31. Terminal 54b is provided above axis AX32(3). Plane PL56b intersects with axis AX32(2) in the region above stator 31. Terminal 54c is provided between axis AX32(4) and axis AX32(5). Plane PL56c intersects with axis AX32(4) and axis AX32(3) in the region above stator 31.

[0099] The planes PL56a, PL56b and PL56c of the convex strip 56 intersect with the axis AX32(n) of the nearest magnetic pole 32a at their radially outer portions, and the angles thereof are greater than 0 degrees and less than 90 degrees.

[0100] Fig. 9 The positions of the welding electrodes 81, 82 relative to the terminal 54 and the coil end 33a are shown. The configurable range RG of the neutral point electrode 52 is shown in a sector shape.

[0101] The manufacturing method of the stator includes a configuration step of configuring a coil end 33a on a convex strip 56. The manufacturing method of the stator includes a welding step of positioning and welding the coil end 33a and the terminal 54 between the welding electrodes 81 and 82 after the configuration step. The configuration step includes multiple configuration steps for multiple coil ends 33a. The welding step includes multiple welding steps for multiple coil ends 33a. Three welding steps can be performed after three configuration steps are completed. One welding step can also be performed after one configuration step is completed, and the three steps are finally repeated.

[0102] The manufacturing method of the stator includes a process of positioning the terminal 54 and the coil end 33a between two welding electrodes 81 and 82. This process is performed by moving the two welding electrodes 81 and 82. The two welding electrodes 81 and 82 are positioned so as to clamp the terminal 54 and the coil end 33a while approaching the stator 31 axially from the open position. At this time, the coil end 33a is positioned on the convex strip 56 in a manner intersecting with the convex strip 56. Next, the terminal 54 and the coil end 33a are pressed between the welding electrodes 81 and 82. The welding electrodes 81 and 82 apply welding current to the terminal 54 and the coil end 33a while pressing them. In this way, the terminal 54 and the coil end 33a are welded to the convex strip 56.

[0103] For example, when the welding process is sequentially performed on a plurality of terminals 54 in the circumferential direction, interference between the welding electrodes 81, 82 and the coil end 33a can be avoided. At this time, the expansion angles Rw1 and Rw2 help to avoid interference between the welding electrodes 81, 82 and the coil end 33a of the non-welding object. For example, when the coil end 33a is welded on the terminal 54b, the expansion angle Rw2 between the plane PL56b and the plane PL56c provides a gap to avoid interference between the welding electrode 81 and the coil end 33a for the terminal 54c.

[0104] According to the above embodiment, the coil end 33a can be welded to the terminal 54 without performing a hook-shaped deep bending process. Therefore, the coil end 33a is easy to process. In addition, since there is no need to perform a hook-shaped deep bending process, the coil end 33a is easy to move during the welding process. Therefore, the position of the coil end 33a can be adjusted without residual stress on the coil end 33a. Since the plurality of coil ends 33a are formed in the same manner, the above effect can be obtained in the entire stator 31. On the stator 31, the plurality of coil ends 33a are spirally inclined in the same direction. Therefore, a cooling medium such as air or oil can flow smoothly along the rotation direction of the rotor 21.

[0105] Second embodiment

[0106] This embodiment is a modification of the previous embodiment. In the above embodiment, two terminals 54 adjacent to each other in the circumferential direction of the stator 31 are inclined to define a spread angle. Alternatively, two terminals 54 adjacent to each other in the circumferential direction may be arranged in parallel.

[0107] like Fig.10 As shown, the neutral point electrode 52 is formed without an expansion angle. Plane PL256a is parallel to plane PL256b. Plane PL256b is parallel to plane PL256c. In the present embodiment, the terminal 54b and the coil end 33a for the terminal 54c are arranged close to the back side of the terminal 54b. However, the interference between the welding electrodes 81, 82 and the coil end 33a can be avoided by performing the arrangement process for the terminal 54c after the welding process of the terminal 54b.

[0108] In addition, when there are two terminals 54 adjacent to each other in the circumferential direction, it is preferable that no other terminal 54 exists in the projection range PRJ in the vertical direction of the surface of one terminal 54. For example, as shown by the dotted line in the figure, when the terminal C54c is located in the projection range PRJ of the terminal 54b, it becomes difficult to arrange the welding electrodes 81 and 82. However, the effect produced by the plurality of coil ends 33a tilted in the circumferential direction can be obtained.

[0109] Third embodiment

[0110] This embodiment is a modification of the previous embodiment. In the above embodiment, the neutral point electrode 52 is a wave shape. Alternatively, the neutral point electrode 52 may have various curved shapes.

[0111] like Fig.11 As shown, the neutral point electrode 52 includes bent portions Bd301, Bd302, Bd303 and Bd304. The bent portions Bd301, Bd302, Bd303 and Bd304 are 90 degrees, that is, right angles. Therefore, the planes PL356a, PL356b and PL356c are parallel to each other.

[0112] The convex strip 56a and the convex strip 56b are formed to protrude from the same surface of the material of the neutral point electrode 52. The bent portion Bd301 and the bent portion Bd302 have bending angles in opposite directions. That is, the bent portion Bd301 has a concave radial outer side surface and a convex radial inner side surface. The bent portion Bd302 has a convex radial outer side surface and a concave radial inner side surface. Therefore, the convex strip 56a and the convex strip 56b slightly protrude toward the radial inner side. In other words, the terminal 54a and the terminal 54b are inclined so that their convex strips 56a, 56b point to the radial inner side.

[0113] The convex strip 56b and the convex strip 56c are formed to protrude from the same surface of the material of the neutral point electrode 52. The bent portion Bd304 and the bent portion Bd303 bend the neutral point electrode 52 in the same direction. Therefore, on the stator 31, the convex strip 56b and the convex strip 56c point in opposite directions.

[0114] The bent portion Bd303 and the bent portion Bd304 separate the terminal 54b and the terminal 54c. In other words, the bent portions Bd303 and Bd304 position the convex strip 56b and the convex strip 56c on both sides. As a result, a gap is formed between the coil end 33a for the convex strip 56b and the coil end 33a for the protrusion 56c.

[0115] According to this embodiment, the welding process can be performed after the plurality of coil ends 33a are arranged on the plurality of terminals 54. Furthermore, interference between the welding electrodes 81, 82 and the coil ends 33a can be avoided. In addition, while the convex strips 56a, 56b, 56c are made to protrude from the same surface of the material of the neutral point electrode 52, a gap for the welding electrodes 81, 82 is formed.

[0116] Fourth embodiment

[0117] This embodiment is a modification of the previous embodiment. In the above embodiment, the plurality of ridges 56 protrude from the same surface of the material plate of the neutral point electrode 52. Alternatively, the plurality of ridges 56 may protrude in different directions.

[0118] exist Fig.12 In the embodiment, the terminal 54c has a convex strip 456c. Among the plurality of convex strips 56, one convex strip 456c protrudes in the opposite direction from the surface opposite to the other convex strips 56a and 56b. The terminal 54c defines a plane PL456c. This plane PL456c extends along the coil end 33a connected to the terminal 54c. The plane PL456c is parallel to the plane PL356b.

[0119] On one surface of the neutral point electrode 52 (the surface pointing to the lower side in the figure), the terminal 54b and the coil end 33a are connected to each other. The coil end 33a connected to the terminal 54b reaches the terminal 54b from one direction in the figure, that is, from the right side. On the other hand, on the other surface of the neutral point electrode 52 (the surface pointing to the upper side in the figure), the terminal 454c and the coil end 33a are connected to each other. The coil end 33a connected to the terminal 454c reaches the terminal 454c from another direction in the figure, that is, from the left side.

[0120] According to the present embodiment, the two coil ends 33a connected to the two adjacent terminals 54b, 54c can be separated on the stator core 32. A bend can be provided between the two adjacent terminals 54b, 54c so that the plane PL356b and the plane PL456c define an expansion angle. The bend can include one or more convex folds and / or concave folds. For example, a convex fold and a concave fold can be provided between the two adjacent terminals 54b, 54c, the neutral point electrode 52 is formed into a step shape, and a step is formed between the two terminals 54b, 54c.

[0121] Fifth embodiment

[0122] This embodiment is a modification of the previous embodiment. In the above embodiment, insulating resin is provided around the neutral point electrode 52 and the plurality of output terminal electrodes 62, 63, 64. The manufacturing method of the stator using these insulating resins can be realized by various manufacturing methods, such as a manufacturing method of curing the fluid resin after coating it, or a manufacturing method of curing the fluid resin after storing it in a container. In this embodiment, the shape of the container for storing the insulating resin is proposed. This embodiment can be applied to the previous embodiment.

[0123] Fig.13 In the embodiment, a container 539a having an annular side wall is provided on the insulator 34. The container 539a is a cylindrical member with the bottom and the top surfaces opened.

[0124] In the container 539a, insulating resin 539b is stored and cured to cover the neutral point electrode 52 and the plurality of output terminal electrodes 62, 63, 64. The container 539a and the insulating resin 539b provide a reservoir-like insulating member. The insulating resin 539b has a cured surface exposed to the top surface of the container 539a.

[0125] The container 539a has an outer peripheral surface 539c facing radially outward. The outer peripheral surface 539c is stepped. The outer peripheral surface 539c can also be called a sawtooth shape. The outer peripheral surface 539c provides a surface intersecting with multiple coil ends 33a. The outer peripheral surface 539c provides a surface at an obtuse angle with multiple coil ends 33a. These surfaces are almost orthogonal to the coil ends 33a. The outer peripheral surface 539c receives a coil end 33a on one surface. These surfaces are flat or curved.

[0126] The outer peripheral surface 539c suppresses the corners of the insulator 34 or the container 539a for receiving the plurality of coil ends 33a from being too thin and / or too sharp. In other words, the receiving portion for receiving the plurality of coil ends 33a can be formed by a thicker resin member. In other words, the corners of the insulator 34 or the container 539a are made to be a gentle angle, preferably an obtuse angle. Thus, the deformation and buckling of the resin material forming the insulator 34 or the container 539a are suppressed. Therefore, the manufacturing method of the stator becomes easy. In addition, the shape of the stator can be stabilized.

[0127] Sixth Embodiment

[0128] This embodiment is a modification of the previous embodiment. In the above embodiment, a convex strip 56 is provided, and in order to connect the coil end 33a to the terminals 54 and 65, the convex strip has a width narrower than the terminals 54 and 65. Alternatively, the terminals 54 and 65 themselves can be designed to have a rod shape having a width equivalent to the convex strip 56. In this embodiment, a neutral point electrode 52 is shown. However, the terminal 65 of the output terminal electrodes 62, 63, and 64 can also be designed to be rod-shaped.

[0129] Fig.14 The neutral point electrode 52 is shown. The neutral point electrode 52 has an elongated common portion 53. The neutral point electrode 52 has a plurality of terminals 54 extending from the common portion 53 in one direction in the width direction. The neutral point electrode 52 has three terminals 54a, 54b, and 54c. The neutral point electrode 52 is a fork-like shape having a plurality of terminals 54 extending from the common portion 53. The plurality of terminals 54 have a height HG. The plurality of terminals 54 are configured to protrude from the insulator 34. These plurality of terminals 54 are covered with an insulating resin after being connected to the coil end 33a. The neutral point electrode 52 has a fixing portion 55 that fixes the neutral point electrode 52 by being inserted into the insulator 34 and the stator core 32. The fixing portion 55 extends from the common portion 53 in the opposite direction of the plurality of terminals 54. The plurality of terminals 54 are rod-shaped. The terminal 54 has a height HG measured from the common portion 53.

[0130] Fig.15: is a plan view of the neutral point electrode 52 when viewed from the axial direction of the stator 31. The plurality of terminals 54 are elliptical or quadrilateral columns with four rounded corners. The terminal 54 has a width WD in the long axis direction and a thickness TH in the short axis direction. The thickness TH is equivalent to the thickness of the base material of the neutral point electrode 52.

[0131] Fig.16 The connection state between the plurality of terminals 54 and the plurality of coil ends 33a, i.e., the neutral point connection, is shown. One terminal 54 is connected to the plurality of coil ends 33a. On both sides provided by one terminal 54, the plurality of coil ends 33a are dispersedly connected.

[0132] The terminal 54 has a plane extending along the coil end 33a. In the present embodiment, one coil end 33a is connected to one plane of one terminal 54, and another coil end 33a is connected to another plane of the same terminal 54. A columnar terminal 54 is arranged and connected between multiple coil ends 33a. In other words, one coil end 33a and one coil end 33a are respectively arranged on both sides of one terminal 54. The two coil ends 33a are arranged at the same height. This structure facilitates connecting multiple coil ends 33a to one terminal. Therefore, in the present embodiment, a total of 6 coil ends 33a can be connected to the neutral point.

[0133] It can be said that the terminal 54 has a column 657. The three column portions 657a, 657b, and 657c are similar in shape. The column portion 657 has at least one longitudinally long planar portion on its outer peripheral surface. The longitudinally long planar portion intersects and extends with the coil end 33a. The column portion 657 has planar portions on both sides of the terminal 54. These planar portions are parts for positioning the coil end 33a. The column portion 657 intersects and extends with the coil end 33a that is inclined relative to the radial direction of the stator core 32. The column portion 657 provides a connection surface equivalent to the convex strip 56. For example, the shape of the column portion 657 is preferably set so that the oxide insulating film at the coil end 33a can be destroyed during the welding process. On the other hand, the shape of the column portion 657 is preferably set so that it is not easily deformed before and after the welding process.

[0134] In the welding process, the coil end 33a and the terminal 54 to be welded are clamped and pressed between two welding electrodes 81 and 82. Here, one coil end 33a is arranged along one plane of one terminal 54. And, another coil end 33a is arranged along another plane of the same terminal 54. The two welding electrodes 81 and 82 are brought close to each other to sandwich the coil end 33a and the terminal 54. Therefore, the welding electrode 81 contacts one coil end 33a. At the same time, the welding electrode 82 contacts the other coil end 33a. In this state, a welding voltage for electric welding is applied between the two welding electrodes 81 and 82. Thus, an electrical connection is made. Therefore, a structure for connecting two coil ends 33a on opposite sides of one terminal 54 can be provided. A structure in which multiple coil ends 33a are connected to both sides or opposite sides of a terminal can also be realized in the terminal 65.

[0135] According to the present embodiment, the plurality of coil ends 33a are arranged to be inclined with respect to the radial direction of the stator core 32. Therefore, the plurality of coil ends can be given a length including a deformation margin. In addition, among the plurality of coil ends 33a, the plurality of coil ends 33a that account for the majority extend in a spiral shape. Therefore, the plurality of coil ends can be given a length including a deformation margin.

[0136] Moreover, in this embodiment, the terminal 54 is provided by a smaller column 657 than in the previous embodiment. Therefore, a lightweight terminal can be provided. In addition, since the terminal 54 does not need the convex strip 56, it is easy to process, and the processing amount and processing steps can be reduced. In addition, compared with the terminal 54 with the convex strip 56, it can be welded in a narrow space.

[0137] In this embodiment, two coil ends 33a can be welded at one time. For example, two sets of star (Y) connected coils can be connected in parallel. Also, two sets of delta (Δ) connected coils can be connected in series. In addition, when performing delta connection, a neutral point is not required.

[0138] In this embodiment, spatter and explosion during welding can be suppressed. When the terminals 54 and 65 have convex strips 56, the single-sided welding electrode 81 or 82 is in direct contact with the terminals 54 and 65. In this case, since the terminal is made of iron or brass and is relatively hard, the contact surface tends to be unstable. In addition, the processing performed to form the convex strips 56 will cause the flatness of the contact surface between the terminal and the welding electrode to deteriorate, and the contact surface will be unstable. Due to these reasons, the contact state between the terminal and the welding electrode is unstable, the contact resistance is unstable, and there is a tendency to easily explode. Since the explosion will damage the shape of the terminal and the coil end 33a, it will cause damage to the electrical connection.

[0139] In contrast, according to the present embodiment, since the terminal is plate-shaped, it is easy to stabilize the shape. For example, even if the terminal is in direct contact with the welding electrode, a stable contact can be obtained. In addition, as shown in the figure, when the coil end 33a is arranged on both sides of the terminal, there is no direct contact between the welding electrode and the terminal. Moreover, since the terminal is in contact with the coil end 33a made of softer aluminum or aluminum alloy, a stable contact resistance can be obtained. Further, since the coil end 33a made of aluminum or aluminum alloy is round and the coil end 33a is easily crushed at the contact portion with the welding electrode, a stable contact can be obtained. For these reasons, according to the present embodiment, it is difficult to cause bursting.

[0140] Seventh embodiment

[0141] This embodiment is a modification of the previous embodiment. In the above embodiment, the terminals 54 and 65 have a flat surface. Alternatively, the terminals 54 and 65 themselves may be in the shape of a rod without a flat surface.

[0142] exist Fig.17 In the embodiment, the terminal 54 is provided by a cylindrical column 757. The three columns 757a, 757b, and 757c are similar in shape. The column 757 has a diameter equal to the thickness TH of the neutral point electrode 52. The outer peripheral surface of the column 757 is composed of only a curved surface over the entire circumference. The column 757 can be connected to the coil end 33a over its entire circumference. In addition, an equal connection state between the column 757 and the coil end 33a can be provided over the entire circumference of the column 757. The column 757 can also be in the shape of an elliptical column.

[0143] Other Implementations

[0144] The invention content of this specification is not limited to the enumerated embodiments. The invention content includes the enumerated embodiments and the modified embodiments obtained by those skilled in the art based on them. For example, the invention content is not limited to the combination of components and / or elements disclosed in the embodiments. The invention content can be implemented through a variety of combinations. The invention content may also have additional parts that can be added to the embodiments. The invention content includes embodiments in which components and / or elements in the embodiments are omitted. The invention content includes the replacement or combination of components and / or elements between one embodiment and other embodiments. The disclosed technical scope is not limited to the description of the embodiments. The disclosed technical protection scope is determined by the description of the claims, and should also be understood to include all changes with the same meaning and scope as the description of the claims.

[0145] In the above embodiment, the stator core 32 has a plurality of magnetic poles 32a and an annular portion 32b connecting the magnetic poles 32a. The annular portion 32b may also be provided by a member that is continuous in the circumferential direction. Alternatively, the annular portion 32b may be provided by a plurality of members that have one or more connecting portions and are connected in an annular shape.

[0146] In the above embodiment, all six coil ends 33a are configured to be spirally inclined in the same direction. Alternatively, a part of the coil ends 33a may be tilted in the opposite direction. For example, a plurality of coil ends 33a for the neutral point electrode 52 may be configured to be a clockwise spiral, while a plurality of coil ends 33a for the output end electrode 63 may be configured to be a counterclockwise spiral. Alternatively, a minority of coil ends 33a may be configured to be parallel to the radial direction. In this case, a plurality of coil ends 33a that are tilted in a spiral shape, which are the majority, may also provide a favorable effect. Alternatively, only a plurality of coil ends 33a for the neutral point 51 may be configured to be spirally inclined. In addition, the number of coil ends 33a is not limited to 6. For example, when a plurality of coils are connected in parallel in one phase, more coil ends 33a may be laid. For example, when two coils are connected in parallel in one phase, twelve coil ends 33a may be laid. Furthermore, a plurality of protruding strips 56 may be formed on one terminal 54 and connected to a plurality of coil ends 33 a .

[0147] In the above embodiment, a single coil 33b is installed in a magnetic pole 32a. The stator coil 33 can be provided by various winding structures. For example, winding structures such as so-called concentrated winding, distributed winding, and dispersed winding can be adopted. In the above embodiment, the stator coil 33 is star-connected. Alternatively, the stator coil 33 can also be connected in a triangle. In this case, for example, a plurality of coil ends 33a are connected at an output terminal electrode 62. In this structure, a plurality of coil ends 33a extend in a spiral shape, thereby obtaining the same effect as the above embodiment.

[0148] In the above embodiment, the neutral point electrode 52 is used. Alternatively, a plurality of coil ends 33a may be connected to form the neutral point 51. Alternatively, a plurality of coil ends 33a may be bundled and covered with a conductive member to form the neutral point 51. In these cases, in order to obtain electrical connection, a bonding material such as solder may be used in addition to welding.

[0149] Description of Reference Numerals

[0150] 10 Power system, 11 Rotating electrical machine, 12 Internal combustion engine,

[0151] 13 body, 14 rotation axis, 15 circuit,

[0152] 16 power lines, 17 signal lines, 18 loads,

[0153] 21 rotor, 22 rotor core, 23 permanent magnet,

[0154] 31 stator, 32 stator core,

[0155] 32a: magnetic pole, 32b: annular portion, 32c: fixed portion,

[0156] 33 stator coil, 33a coil end, 33b single coil,

[0157] 34 insulator, 35 bottom surface, 36 groove,

[0158] 37 guide part, 38 guide part, 41 sensor unit,

[0159] 51 neutral point, 52 neutral point electrode, 53 common part, 54 terminal,

[0160] 61 output terminal, 62, 63, 64 output terminal electrodes, 65 terminal,

[0161] Bd bending part.

Claims

1. A stator of a rotating electric machine for an internal combustion engine, the stator of the rotating electric machine for an internal combustion engine comprising: a stator core having a plurality of magnetic poles; A stator coil, wherein the stator coil comprises a plurality of single coils arranged on a plurality of the magnetic poles; a plurality of coil ends of the stator coil; as well as A terminal connected to the coil end and not requiring a convex strip; wherein, The terminal has longitudinally elongated planar portions on both sides thereof; On the longitudinal planar portions on both sides of one of the terminals, the plurality of coil ends are welded while sandwiching both sides of the planar portions.

2. A stator of a rotating electric machine for an internal combustion engine, the stator of the rotating electric machine for an internal combustion engine comprising: a stator core having a plurality of magnetic poles; A stator coil, wherein the stator coil comprises a plurality of single coils arranged on a plurality of the magnetic poles; a plurality of coil ends of the stator coil; as well as A terminal connected to the coil end and not requiring a convex strip; wherein, The terminal has a longitudinally elongated planar portion; A plurality of coil ends are connected to one of the terminals; Between the plurality of coil ends connected to one of the terminals, the longitudinally long plane portion of one of the terminals is configured to be sandwiched and extended by the plurality of coil ends and to be welded. 3 . The stator of a rotating electrical machine for an internal combustion engine according to claim 1 , wherein the terminal is columnar. 4 . The stator of a rotating electrical machine for an internal combustion engine according to claim 3 , wherein one of the terminals is elliptical in shape, or one of the terminals is a quadrilateral columnar shape with four rounded corners.

5. The stator of the rotating electrical machine for an internal combustion engine according to claim 1 or 2, wherein one of the terminals is provided on the electrode; The electrode is a neutral point electrode providing a neutral point for a star connection.

6. The stator of a rotating electrical machine for an internal combustion engine according to claim 1 or 2, wherein one of the terminals is provided on an electrode; The electrode is an output end electrode providing an output end of the stator coil.

7. The stator of a rotating electrical machine for an internal combustion engine according to claim 1 or 2, wherein two of the coil ends are connected to one of the terminals.

8. The stator of the rotating electrical machine for an internal combustion engine according to claim 1 or 2, wherein the stator core has an annular portion connecting the plurality of magnetic poles; The terminal is arranged on the annular portion.

9. The stator of a rotating electrical machine for an internal combustion engine according to claim 1 or 2, wherein the stator coil is made of aluminum or an aluminum alloy.

10. The stator of a rotating electrical machine for an internal combustion engine according to claim 1 or 2, wherein the stator coil is made of copper or a copper alloy.

11. The stator of a rotating electrical machine for an internal combustion engine according to claim 1 or 2, wherein the terminal is made of iron or brass.

12. A rotating electric machine for an internal combustion engine, comprising: The stator according to any one of claims 1 to 11; as well as The rotor spans across the end surface and radially outer side of the stator and is rotatably supported so as to face the plurality of magnetic poles.

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