Motor, method for manufacturing motor, and method for manufacturing bus bar

Abstract

This motor has a stator having an annular stator core having a plurality of slots arranged in a circumferential direction, a plurality of coils inserted into the plurality of slots, and a plurality of plate-like bus bars connected to the plurality of coils. The plurality of bus bars each have a bus bar body part extending along the circumferential direction, and a bus bar connection part that extends from the bus bar body part toward a first direction, which is one side in a normal direction with respect to each of the circumferential direction and a plate thickness direction of the bus bar. The plurality of coils are formed by winding rectangular wiring around the stator core, and have a coil end part disposed separated from the bus bar body part in the first direction. The bus bar connection part has: a support part that comes into contact with a portion of the coil end part in a second direction opposite to the first direction and defines the position of the coil end part in a central axis direction; and a first surface contact part and a second surface contact part that make surface-to-surface contact with a first surface, which is one surface of the coil end part in the plate thickness direction, and a second surface, which is the surface on the other side.

Description

Motor, Method for Manufacturing Motor, and Method for Manufacturing Busbar

[0001] The present invention relates to a motor, a method for manufacturing a motor, and a method for manufacturing a busbar.

[0002] Conventionally, in the connection between coils in a motor and the electrical connection with a substrate, a busbar may be used. In such a case, the connection between the busbar and the coil is performed by welding, caulking, soldering, etc. As a technique for positioning the busbar and the coil at the connection position and connecting the positioned busbar and coil by welding, for example, there are the techniques described in Patent Document 1 and Patent Document 2. In the technique described in Patent Document 1, the busbar has a U-shaped connection portion, and the coil end is sandwiched between the connection portions and fixed by welding, or connected by caulking, soldering, etc.

[0003] In the technique described in Patent Document 2, the busbar has a terminal portion that is welded in a state where a plurality of wire ends of conductive wires led out from the coil are bundled. The terminal portion has a caulking portion that can be bent and deformed so as to hold the periphery of the wire ends. That is, after putting a predetermined group of wire ends into the caulking portion, the caulking portion is bent to position the busbar and the group of wire ends. Then, welding is performed.

[0004] Japanese Unexamined Patent Application Publication No. 2021 - 158797, Japanese Unexamined Patent Application Publication No. 2011 - 125119

[0005] However, in the above prior art, when a rectangular wire is applied as the coil winding, since the rigidity of the rectangular wire is high, it is difficult to adjust the misalignment between the end of the rectangular wire and the busbar. Generally, the position adjustment between the busbar and the coil is performed with a dedicated jig or a busbar holder. However, when a plurality of busbars are used, the jig and the coil retainer become complicated, and it becomes difficult to position the busbar and the coil. As a result, defects in welding and soldering during joining are likely to occur. Therefore, one of the objectives of the present invention is to provide a motor having a busbar with a structure capable of reducing connection defects due to misalignment between the busbar and the coil end.

[0006] One embodiment of the motor according to the present disclosure includes a stator having a cylindrical or annular stator core having a plurality of slots arranged in the circumferential direction, a plurality of coils inserted into the plurality of slots, and a plurality of plate-shaped busbars connected to the plurality of coils, and a rotor having a central axis and rotatable about the central axis relative to the stator, wherein each of the plurality of busbars has a busbar body portion extending along the circumferential direction, and a first direction extending from the busbar body portion toward one side of the direction normal to the circumferential direction and the thickness direction of the busbar, respectively The busbar has a busbar connection portion, and each of the plurality of coils is constructed by winding a flat wire around the stator core and has a coil end which is the end of the flat wire spaced apart in the first direction from the busbar body portion, and the busbar connection portion has a support portion which contacts a portion of the coil end in a second direction which is opposite to the first direction and defines the position of the coil end in the central axis direction, and a first surface contact portion and a second surface contact portion which are in surface contact with a first surface which is one side surface in the thickness direction of the coil end and a second surface which is the other side surface.

[0007] Furthermore, one embodiment of the motor manufacturing method according to the present disclosure is a motor manufacturing method comprising the steps of bringing the other side of the coil end in the second direction into contact with the support portion of the busbar connection portion, and bringing the first surface contact portion and the second surface contact portion of the busbar connection portion into surface contact with the first surface and the second surface contact portion of the coil end in the state in contact with the support portion.

[0008] Furthermore, one embodiment of the busbar manufacturing method according to the present disclosure is a method for manufacturing a busbar which is inserted into the slots of a cylindrical or annular stator core having a plurality of slots arranged in the circumferential direction and connected to the end of a coil formed by winding a flat wire around the stator core, and includes the steps of: punching out a busbar base from a conductive plate-like member, having a flat rod-shaped first portion and a rectangular second portion that extends continuously toward the first direction from a part of the surface on the first direction side which is one side of the longitudinal direction and the thickness direction of the first portion, respectively; bending the plate surface of the busbar base to bend the busbar base into a shape along the circumferential direction of the stator core; dividing the second portion of the busbar base into two in the longitudinal direction; and bending one and the other of the divided portions of the second portion such that they form a V shape when viewed from the circumferential direction.

[0009] According to this disclosure, it is possible to provide a motor having a busbar with a structure that can reduce connection failures caused by misalignment between the busbar and the coil end.

[0010] Figure 1 is a perspective view of a motor according to the first embodiment. Figure 2 is a plan view of the stator. Figure 3 is a perspective view showing the schematic configuration of a busbar unit according to the first embodiment. Figure 4a is a partial perspective view of a busbar unit including a first busbar before it is connected to the coil ends. Figure 4b is a partial perspective view of a busbar unit including a first busbar connected to the coil ends. Figure 5a is a diagram showing the connection process between the busbar connection portion of the first busbar and the coil ends. Figure 5b is a diagram showing the connection process between the busbar connection portion of the first busbar and the coil ends. Figure 5c is a diagram showing the connection process between the busbar connection portion of the first busbar and the coil ends. Figure 6a is a diagram showing the manufacturing process of the first busbar. Figure 6b is a diagram showing the manufacturing process of the first busbar. Figure 6c is a diagram showing the manufacturing process of the first busbar. Figure 6d is a diagram showing the manufacturing process of the first busbar. Figure 6e is a diagram showing the manufacturing process of the first busbar. Figure 7 is a perspective view showing the schematic configuration of a busbar unit according to a modified example of the first embodiment. Figure 8 is a partial perspective view of a busbar unit including a fourth busbar connected to the coil end. Figure 9a is a diagram showing the connection process between the busbar connection portion of the fourth busbar and the coil end 65c. Figure 9b is a diagram showing the connection process between the busbar connection portion of the fourth busbar and the coil end. Figure 9c is a diagram showing the connection process between the busbar connection portion of the fourth busbar and the coil end. Figure 10a is a diagram showing the manufacturing process of the fourth busbar. Figure 10b is a diagram showing the manufacturing process of the fourth busbar. Figure 10c is a diagram showing the manufacturing process of the fourth busbar. Figure 10d is a diagram showing the manufacturing process of the fourth busbar. Figure 10e is a diagram showing the manufacturing process of the fourth busbar. Figure 10f is a diagram showing the manufacturing process of the fourth busbar. Figure 11 is a perspective view showing the schematic configuration of a busbar unit according to a second embodiment. Figure 12a is a partial perspective view of a busbar unit including a second busbar before it is connected to the coil end. Figure 12b is a partial perspective view of a busbar unit including a second busbar connected to the coil end. Figure 13a shows the connection process between the busbar connection portion of the second busbar and the coil end. Figure 13b shows the connection process between the busbar connection portion of the second busbar and the coil end.Figure 13c is a diagram showing the connection process between the busbar connection portion of the second busbar and the coil end. Figure 14a is a diagram showing the manufacturing process of the second busbar. Figure 14b is a diagram showing the manufacturing process of the second busbar. Figure 14c is a diagram showing the manufacturing process of the second busbar. Figure 14d is a diagram showing the manufacturing process of the second busbar. Figure 14e is a diagram showing the manufacturing process of the second busbar. Figure 14f is a diagram showing the manufacturing process of the second busbar. Figure 14g is a diagram showing the manufacturing process of the second busbar. Figure 15 is a perspective view showing the schematic configuration of a busbar unit according to the third embodiment. Figure 16a is a partial perspective view of the busbar unit including the third busbar before it is connected to the coil end. Figure 16b is a partial perspective view of the busbar unit including the third busbar after it has been connected to the coil end. Figure 17a is a diagram showing the connection process between the busbar connection portion of the third busbar and the coil end. Figure 17b is a diagram showing the connection process between the busbar connection portion of the third busbar and the coil end. Figure 17c shows the connection process between the busbar connection portion and the coil end of the third busbar. Figure 18a shows the manufacturing process of the third busbar. Figure 18b shows the manufacturing process of the third busbar. Figure 18c shows the manufacturing process of the third busbar. Figure 18d shows the manufacturing process of the third busbar. Figure 18e shows the manufacturing process of the third busbar. Figure 19a shows another manufacturing process of the third busbar. Figure 19b shows another manufacturing process of the third busbar. Figure 19c shows another manufacturing process of the third busbar. Figure 19d shows another manufacturing process of the third busbar. Figure 19e shows another manufacturing process of the third busbar. Figure 19f shows another manufacturing process of the third busbar. Figure 19g shows another manufacturing process of the third busbar. Figure 20 is a partial perspective view showing the schematic configuration of the busbar unit in the fourth embodiment.

[0011] Embodiments of the motor of this disclosure will be described in detail below with reference to the attached drawings. However, in order to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art, more detailed explanations than necessary may be omitted. For example, detailed explanations of already well-known matters and redundant explanations of substantially identical configurations may be omitted. Also, elements shown in the previously described drawings may be referenced as appropriate in the later descriptions of the drawings. Furthermore, the components in each drawing are not limited to the dimensions and dimensional ratios of each component shown in each drawing.

[0012] The Z-axis is shown in each figure as appropriate. The Z-axis is a hypothetical axis parallel to the central axis J, which will be described later. The Z-axis is a vertical direction, with the positive side being "up" and the negative side being "down". The motor's orientation in the vertical direction in this specification is an example for illustrative purposes only and does not limit the orientation of the motor during use.

[0013] Furthermore, in the following description, the direction parallel to the central axis J is referred to as the "axial direction," the direction perpendicular to the central axis J is referred to as the "radial direction," and the direction along the arc centered on the central axis J is referred to as the "circumferential direction." Within the radial direction, the direction approaching the central axis J is called the radially inward direction, and the direction moving away from the central axis J is called the radially outward direction. In this embodiment, the radially inward direction corresponds to one side of the radial direction, and the radially outward direction corresponds to the other side of the radial direction.

[0014] Furthermore, in the following description, the expressions “fixed,” “connected,” and “attached” (hereinafter referred to as “fixed, etc.”) include not only cases where the components are directly fixed, etc. to each other, but also cases where they are fixed, etc. via other components. In other words, in the following description, the expression “fixed, etc.” includes the meaning of direct and indirect fixing, etc. to each other. [First Embodiment] Figure 1 is a perspective view of the motor 100 of the first embodiment. Figure 2 is a plan view of the stator 60. As shown in Figure 1, the motor 100 of the first embodiment has a rotor 20 and a stator 60 arranged coaxially below the rotor 20 (on one axial side).

[0015] The rotor 20 has a cylindrical central shaft 20a extending along the central axis J, and is rotatable around the central shaft 20a as its axis of rotation. The rotor 20 is an annular shape surrounding the central axis J. The rotor 20 is fixed to the outer surface of the central shaft 20a. The central shaft 20a is the output shaft of the motor 100 and rotates with a driving force corresponding to the power supplied to the motor 100.

[0016] The stator 60 has a stator core 60a made of a magnetic material and a plurality of coils 65. The stator core 60a has an annular back yoke 61 surrounding the central axis J and a plurality of core portions 64 protruding upward from the upper surface of the back yoke 61. The stator 60 of the first embodiment is provided with 12 core portions 64 arranged at equal intervals in the circumferential direction and 12 coils 65 wound around the core portions 64. That is, the stator 60 of this embodiment has 12 slots 62 arranged in the circumferential direction. The stator 60 is fixed to a housing (not shown). The stator 60 rotates the rotor 20 by forming a magnetic field with power supplied to the motor 100.

[0017] The core portion 64 extends in a columnar shape along the axial direction. The core portion 64 has a rotor-facing surface 64a that faces upward (i.e., towards the rotor 20). The shape of the core portion 64 when viewed from the axial direction is an isosceles trapezoid shape with corner radii at the corners. The core portion 64 has two parallel sides when viewed from the axial direction, with the shorter side facing radially inward and the longer side facing radially outward, and two sides of equal length connecting these two sides arranged along the radial direction.

[0018] The coil 65 is made of flat rectangular wire. The coil 65 is made by winding the flat rectangular wire around the core portion 64. The flat rectangular wire includes wires with a rectangular cross-section and wires with a square cross-section. In the first embodiment, the flat rectangular wire has a rectangular cross-section. In the first embodiment, a concentrated winding method is employed, and furthermore, an α-winding method is employed. Also, in the first embodiment, the rectangular flat rectangular wire is wound with the longer side of the cross-section, which is easier to bend, bent. Alternatively, a so-called edgewise coil winding method may be employed, where the shorter side of the cross-section is bent before winding. The rotor 20 is not shown in the figure, but it has a magnet that faces the coil 65 of the stator 60 in the axial direction. The magnet is a permanent magnet. That is, the stator 60 and rotor 20 of the first embodiment constitute a so-called axial gap type motor.

[0019] As shown in Figure 2, a busbar unit 90 is fixed radially inward on the upper surface (i.e., the surface facing the rotor 20) of the back yoke 61 of the stator 60. The busbar unit 90 is an annular shape surrounding the central axis J. That is, the busbar unit 90 is positioned radially inward from the multiple coils 65.

[0020] Figure 3 is a perspective view of a busbar unit 90 according to the first embodiment. The example shown in Figure 3 shows a state in which one coil 65 is connected to the busbar connection portion 92C of one first busbar 92, but in reality, twelve coils 65 are connected to their respective busbars. Also, although the coil 65 is normally wound around a core portion 64, the example shown in Figure 3 shows the state in which the core portion 64 has been removed. As shown in Figure 3, the busbar unit 90 includes a busbar holder 91, a first busbar 92, a second busbar 93, and a third busbar 94.

[0021] The busbar holder 91 has an annular shape along the circumferential direction of the stator core 60a. The busbar holder 91 is made of resin. The busbar holder 91 is manufactured by insert molding using a plurality of first busbars 92, a plurality of second busbars 93, and a plurality of third busbars 94 as insert members.

[0022] The first busbar 92, the second busbar 93, and the third busbar 94 are each plate-shaped members. Each first busbar 92 has a busbar body portion 92M and one or two busbar connection portions 92C. Each second busbar 93 has a busbar body portion 93M and one or two busbar connection portions 93C. Each third busbar 94 has a busbar body portion 94M and one or two busbar connection portions 94C. The busbar body portions 92M, 93M, and 94M each have a shape that is aligned with the circumferential direction of the stator core 60a.

[0023] The example shown in Figure 3 shows a busbar unit 90 having three types of busbars, including the first busbar 92, the second busbar 93, and the third busbar 94 according to the first to third embodiments. The busbar unit 90 is not limited to the configuration shown in Figure 3; it may be composed of only one type of busbar, the first busbar 92, or of any two types of combinations including the first busbar 92.

[0024] On the other hand, the coil 65 has a winding portion 65a, which is the part wound around the core portion 64, and a coil lead portion 65b, which is the part drawn out from the winding portion 65a. The coil lead portion 65b has a coil end 65c at its tip. The coil end 65c is connected to the busbar connection portion 92C, the busbar connection portion 93C, and the busbar connection portion 94C, respectively. The coil end 65c is the part at the tip of the coil lead portion 65b that has been bent to follow the circumferential direction of the stator core. Due to this bending, the coil end 65c is positioned such that one side of the surface facing the long side of the cross-section of the rectangular wire faces radially outward, and the other side faces radially inward. [Structure of the first busbar 92 and connection structure with the coil end 65c]

[0025] In the following description of the first embodiment, the structure of the first busbar 92 and the connection structure between the coil 65 and the first busbar 92 will be described in detail. Figure 4a is a partial perspective view of the busbar unit 90 including the first busbar 92 before it is connected to the coil end 65c. Figure 4b is a partial perspective view of the busbar unit 90 including the first busbar 92 after it has been connected to the coil end 65c.

[0026] As shown in Figure 4a, the busbar connection portion 92C has a first connection portion 92a and a second connection portion 92b. Here, the thickness direction of the first busbar 92 corresponds to the radial direction, and the direction normal to the thickness direction and circumferential direction of the first busbar 92 corresponds to the axial direction. This is also true for the other busbars. In the example shown in Figure 4a, the busbar connection portion 92C is not connected to the coil end portion 65c.

[0027] In the state shown in Figure 4a, the first connecting portion 92a extends diagonally in the first direction (up (+Z) direction), which is one of the axial directions of the busbar body portion 92M, and radially outward. Furthermore, the second connecting portion 92b extends diagonally in the first direction and radially outward from a position circumferentially offset from the first connecting portion 92a of the busbar body portion 92M. That is, the first connecting portion 92a and the second connecting portion 92b form a V shape when viewed from the circumferential direction. In addition, the inner circumferential surface of the first connecting portion 92a, which forms the V shape, faces radially inward, and the inner circumferential surface of the second connecting portion 92b faces radially outward.

[0028] On the other hand, as shown in Figures 3 and 4b, the first connection portion 92a has an upper end portion 92d and a first support portion 92g when the busbar connection portion 92C and the coil end portion 65c are connected. Furthermore, the second connection portion 92b has an upper end portion 92f and a second support portion 92h.

[0029] The first support portion 92g extends diagonally outward in the first direction and radially outward, and the upper end portion 92d extends straight in the first direction from the upper end of the first support portion 92g. The second support portion 92h extends diagonally inward in the first direction and radially inward, and the upper end portion 92f extends straight in the first direction from the upper end of the second support portion 92h.

[0030] The first surface contact portion 92dc, which is a part of the inner circumferential surface of the upper end portion 92d of the first connection portion 92a, is in surface contact with the first surface 65d, which is the surface of the coil end portion 65c facing radially outward. In addition, the second surface contact portion 92fc, which is a part of the inner circumferential surface of the upper end portion 92f of the second connection portion 92b, is in surface contact with the second surface 65f, which is the surface of the coil end portion 65c facing radially inward. Furthermore, a part of the inclined surface of the first support portion 92g of the first connection portion 92a facing the inner diameter side is in contact with the third surface 65g (see Figure 5b), which is the surface of the coil end portion 65c facing the other axial direction, the second direction (downward (-Z) direction). Furthermore, a part of the inclined surface of the second support portion 92h of the second connection portion 92b facing the outer diameter side is in contact with the third surface 65g of the coil end portion 65c. Hereinafter, the first surface 65d of the coil end 65c facing radially outward will be referred to as the "outer surface 65d," and the second surface 65f facing radially inward will be referred to as the "inner surface 65f." Furthermore, the third surface 65g of the coil end 65c facing in the second direction (downward) will be referred to as the "bottom surface 65g." [Connection process between the busbar connection part 92C and the coil end 65c]

[0031] Next, the connection process between the busbar connection portion 92C and the coil end 65c, which is included in the manufacturing process of the motor 100, will be described based on Figures 5a, 5b, and 5c. Figures 5a to 5c show the connection process between the busbar connection portion 92C of the first busbar 92 and the coil end 65c. Figure 5a shows the first connection portion 92a and the second connection portion 92b of the busbar connection portion 92C before connection to the coil end 65c.

[0032] As shown in Figures 5a and 5b, first, the lower surface 65g of the coil end 65c is brought into contact with both the inclined surfaces 92gs and 92hs of the first support portion 92g and the second support portion 92h of the first connecting portion 92a and the second connecting portion 92b, which form a V-shape when viewed from the circumferential direction. This determines the axial position between the coil end 65c and the busbar connecting portion 92C.

[0033] Next, as shown in Figure 5b, an external force is applied to the upper ends of the first connection portion 92a and the second connection portion 92b in the direction indicated by the arrow. That is, the upper ends of the first connection portion 92a and the second connection portion 92b are crimped. As a result, as shown in Figure 5c, the deformed portions due to crimping form the upper ends 92d and 92f, and the uncrimped portions form the first support portion 92g and the second support portion 92h. Consequently, the inner surface of the upper end portion 92d forms a first surface contact portion 92dc, and the first surface contact portion 92dc makes surface contact with the outer surface 65d of the coil end portion 65c. In addition, the inner surface of the upper end portion 92d forms a second surface contact portion 92fc, and the second surface contact portion 92fc makes surface contact with the inner surface 65f of the coil end portion 65c. Furthermore, although the position of the coil end 65c shifts slightly in the first direction due to crimping, contact between the inclined surfaces 92gs and 92hs and the lower surface 65g of the coil end 65c is maintained. In addition, after crimping, the connection between the busbar connection portion 92C and the coil end 65c can be reinforced as needed, for example, by welding or soldering. [Manufacturing method of the first busbar 92]

[0034] Next, the manufacturing method of the first busbar 92 will be described based on Figures 6a, 6b, 6c, 6d, and 6e. Figures 6a to 6e show the manufacturing process of the first busbar 92. Figures 6a and 6b are views of the busbar base 920 or the busbar base during processing, viewed from the plate side. Figures 6c to 6e are views of the busbar base 920 during or after processing, viewed from one side in the longitudinal direction.

[0035] First, a busbar base 920 in the shape shown in Figure 6a is punched out from a conductive plate-like member (not shown) by punching. Specifically, the busbar base 920 has a first rectangular bar-shaped portion 921 and a second portion 923 that extends continuously from one end of the first portion 921 in the longitudinal direction. The first portion 921 and the second portion 923 are parts of a single member. The second portion 923 extends continuously in the third direction from one end of the longitudinal direction of the surface on the third direction side, which is one side of the normal direction to the longitudinal direction and the thickness direction of the first portion 921. The second portion 923 forms a rectangle when viewed from the thickness direction.

[0036] Next, as shown in Figure 6b, the second part 923 of the busbar base 920 is divided into two parts along the longitudinal direction of the first part 921. Specifically, a notch 923n is made at an intermediate position along the longitudinal direction of the second part 923, dividing the second part 923 into two parts along the longitudinal direction. As a result, the second part 923 is divided into two parts: a first divided part 923a extending in a third direction from the first part 921, and a second divided part 923b extending in a third direction from a position shifted to one side in the longitudinal direction from the first divided part 923a. Note that in the example shown in Figure 6b, the second part 923 is divided equally into two parts along the longitudinal direction, but it is not limited to equal division; it may also be divided unequally.

[0037] Here, as shown in Figure 6c, the busbar base 920, after the second portion 923 is divided into two longitudinal sections, becomes straight when viewed from the longitudinal direction. Subsequently, as shown in Figure 6d, a force in the direction of the arrow is applied to the first divided portion 923a and the second divided portion 923b. As a result, as shown in Figure 6e, one of the first divided portion 923a and the second divided portion 923b tilts to one side in the thickness direction, and the other tilts to the other side in the thickness direction. Consequently, the first divided portion 923a and the second divided portion 923b combine to form a V-shape when viewed from the longitudinal direction.

[0038] Finally, although not shown in the diagram, the plate surface of the busbar base 920 is bent to create a shape that conforms to the circumferential direction of the stator core 60a. Note that this bending process may be performed at any other time, not necessarily at the end, such as after the step of punching out the busbar base 920 from the plate-like member, or after the step of dividing the second part 923 into two.

[0039] The first busbar 92 is manufactured through the above process. Specifically, the first portion 921 corresponds to the busbar body portion 92M, and the bent first divided portion 923a and second divided portion 923b correspond to the first connecting portion 92a and second connecting portion 92b before being connected to the coil end 65c. [Effects of the first embodiment]

[0040] With the configuration described above, the motor 100 of the first embodiment can secure a contact area with the coil end 65c, which is made of flat wire, by the first surface contact portion 92dc and the second surface contact portion 92fc. Furthermore, when connecting the coil end 65c to the busbar connection portion 92C, the inclined surfaces 92gs and 92hs of the first support portion 92g and the second support portion 92h can position the coil end 65c and the busbar connection portion 92C in the axial direction. In other words, axial positioning can be performed without using jigs or the like. This prevents defects in crimping, welding, soldering, etc., caused by axial misalignment between the coil end 65c and the busbar connection portion 92C. As a result, a motor 100 can be provided having a first busbar 92 with a structure that can reduce connection defects caused by misalignment between the coil end 65c and the busbar connection portion 94C. In addition, the coil end 65c is arranged so that its outer surface 65d and inner surface 65f face radially outward and inward, respectively. This allows the coil end 65c to be connected to the first busbar 92 in a proper surface contact state without deforming the first busbar 92.

[0041] Furthermore, according to the manufacturing method of the motor 100 of the first embodiment, first, the lower surface 65g of the coil end 65c is brought into contact with the inclined surfaces 92gs and 92hs on the inside of the first connecting portion 92a and the second connecting portion 92b, which form a V shape when viewed from the circumferential direction. Next, an external force is applied to the upper end portions of the first connecting portion 92a and the second connecting portion 92b to crimp the upper end portions of the first connecting portion 92a and the second connecting portion 92b, thereby connecting the coil end 65c and the busbar connecting portion 92C.

[0042] This allows the upper ends of the first connecting portion 92a and the second connecting portion 92b to be crimped while they are positioned in the axial direction, thereby reducing contact problems caused by misalignment. Furthermore, by reinforcing the connection after crimping with welding or soldering, the coil end 65c and the first busbar 92 can be connected more firmly.

[0043] Further, according to the manufacturing method of the first bus bar 92 of the first embodiment, a second part, which is a part of a single member, can be divided into two in the longitudinal direction to form a first divided part 923a and a second divided part 923b. Further, by bending the first divided part 923a and the second divided part 923b, which are in positions longitudinally shifted from each other, the first connection part 92a and the second connection part 92b of the first bus bar 92 can be formed. As a result, compared with the case of combining a plurality of members, the number of steps can be reduced, so the manufacturing time can be shortened. Also, since the material can be used efficiently, the cost of the material can be reduced. [Modification Example of the First Embodiment]

[0044] Next, a modification example of the first embodiment will be described. FIG. 7 is a perspective view of a bus bar unit 90 according to a modification example of the first embodiment. The example shown in FIG. 7 shows a state in which one coil 65 and a bus bar connection part 192C of one fourth bus bar 192 are connected. Also, although the coil 65 would originally be wound around the core part 64, the example shown in FIG. 7 shows a state in which the core part 64 is removed.

[0045] As shown in Figure 7, the busbar unit 190 according to this modified example has a configuration in which one of the multiple first busbars 92 is replaced with a fourth busbar 192 in the busbar unit 90 of the first embodiment described above. Note that the example shown in Figure 7 shows a busbar unit 190 having four types of busbars: the first to third busbars 92 to 94 according to the first to third embodiments and the fourth busbar 192 according to this modified example. The busbar unit 190 is not limited to the configuration shown in Figure 7, and may be composed of only one type of busbar, the fourth busbar 192, or of any three types or combination of two types including the fourth busbar 192. In addition, the busbar unit 190 may have a configuration in which there is only one fourth busbar 192 but there are two or more. [Structure of the fourth busbar 192 and connection structure with coil end 65c] Hereinafter, the structure of the fourth busbar 192 and the connection structure between the coil 65 and the fourth busbar 192 will be described in detail in this modified example. Figure 8 is a partial perspective view of the busbar unit 90, including the fourth busbar 192 connected to the coil end 65c. Specifically, the fourth busbar 192 has a busbar connection portion 192C in place of the busbar connection portion 92C in the first busbar 92 of the first embodiment.

[0046] The busbar connection portion 192C in this modified example has a configuration in which a third connection portion 92c is added to the busbar connection portion 92C of the first embodiment, as shown in Figure 8. The third connection portion 92c extends in the first direction from a position offset to one side in the circumferential direction relative to the first connection portion 92a and the second connection portion 92b of the busbar body portion 92M. The third connection portion 92c is a portion that defines the circumferential position of the coil end portion 65c. Furthermore, the first connection portion 92a in this modified example has a first claw portion 92i that protrudes radially inward from its tip on the first direction side. Furthermore, the second connection portion 92b in this modified example has a second claw portion 92j that protrudes radially outward from its tip on the first direction side.

[0047] In a state where the bus bar connection part 192C and the coil end part 65c are connected, the first surface contact part 92dc of the upper end part 92d of the first connection part 92a and the outer side surface 65d of the coil end part 65c are in a surface contact state. In addition, the second surface contact part 92fc of the upper end part 92f of the second connection part 92b and the inner side surface 65f of the coil end part 65c are in a surface contact state. Further, a part of the inclined surface 92gs of the first support part 92g of the first connection part 92a is in contact with the lower surface 65g (see FIG. 9b) of the coil end part 65c. Further, a part of the inclined surface 92hs of the second support part 92h of the second connection part 92b is in contact with the lower surface 65g of the coil end part 65c. Further, a surface 92k facing the coil end part 65c side among the surfaces facing the circumferential direction of the third connection part 92c is in surface contact with the tip surface facing the circumferential direction of the coil end part 65c. Furthermore, the surface facing the second direction side of the first claw part 92i of the first connection part 92a is in contact with the fourth surface 65h which is the surface facing the first direction side of the coil end part 65c. In addition, the surface facing the second direction side of the second claw part 92j of the second connection part 92b is in contact with the fourth surface 65h of the coil end part 65c. The third connection part 92c determines the circumferential position of the coil end part 65c. The first claw part 92i and the second claw part 92j prevent the coil end part 65c from coming off to the first direction side. Hereinafter, the fourth surface 65h facing the first direction side (upper side) of the coil end part 65c is referred to as the "upper surface 65h". [Connection process of the bus bar connection part 192C and the coil end part 65c]

[0048] Next, based on FIGS. 9a, 9b, and 9c, the connection process of the bus bar connection part 192C and the coil end part 65c included in the manufacturing process of the motor 100 will be described. FIGS. 9a to 9c are diagrams showing the connection process of the bus bar connection part 192C and the coil end part 65c of the fourth bus bar 192. FIG. 9a shows the first connection part 92a, the second connection part 92b, and the third connection part 92c of the bus bar connection part 192C before connecting to the coil end part 65c.

[0049] As shown in Figures 9a and 9b, first, the lower surface 65g of the coil end 65c is brought into contact with both the inclined surfaces 92gs and 92hs of the first support portion 92g and the second support portion 92h of the first connection portion 92a and the second connection portion 92b, which form a V-shape when viewed from the circumferential direction. This determines the axial position of the coil end 65c and the busbar connection portion 192C. Next, the tip surface of the coil end 65c is abutted against the circumferentially facing surface 92k of the third connection portion 92c. This determines the circumferential position of the coil end 65c and the busbar connection portion 192C.

[0050] Next, as shown in Figure 9b, an external force is applied to the upper end portions of the first connection portion 92a and the second connection portion 92b in the direction indicated by the arrow. That is, the upper end portions of the first connection portion 92a and the second connection portion 92b are crimped. As a result, as shown in Figure 9c, the deformed portions due to crimping form the upper ends 92d and 92f, and the uncrimped inclined portions form the first support portion 92g and the second support portion 92h. Consequently, the first surface contact portion 92dc of the upper end portion 92d makes surface contact with the outer surface 65d of the coil end portion 65c. In addition, the second surface contact portion 92fc of the upper end portion 92d makes surface contact with the outer surface 65d of the coil end portion 65c. Furthermore, the surfaces of the first claw portion 92i and the second claw portion 92j facing the second direction come into contact with the upper surface 65h of the coil end portion 65c. Furthermore, although the position of the coil end 65c shifts slightly in the first direction due to crimping, contact between the inclined surfaces 92gs and 92hs and the lower surface 65g of the coil end 65c is maintained. In addition, contact between the tip surface of the coil end 65c and the surface 92k of the third connection portion 92c is also maintained. Moreover, after crimping, the connection between the busbar connection portion 192C and the coil end 65c can be reinforced as needed, for example, by welding or soldering. [Manufacturing method of the fourth busbar 192]

[0051] Next, the manufacturing method of the fourth busbar 192 will be described based on Figures 10a, 10b, 10c, 10d, 10e, and 10f. Figures 10a to 10f are diagrams showing the manufacturing process of the fourth busbar 192. Figures 10a and 10b are views of the busbar base 924 or the busbar base during processing, viewed from the plate side. Figures 10c to 10f are views of the busbar base 924 during or after processing, viewed from one side in the longitudinal direction.

[0052] First, a busbar base 924 in the shape shown in Figure 10a is punched out from a conductive plate-like member (not shown). Specifically, the busbar base 924 has a flat rectangular rod-shaped first portion 921 and a second portion 925 that extends continuously from one end of the first portion 921 in the longitudinal direction. The first portion 921 and the second portion 925 are parts of a single member.

[0053] The second portion 925 is wider in the longitudinal direction of the first portion 921 than the second portion 923 of the first embodiment described above. The second portion 925 extends continuously toward the third direction from one end in the longitudinal direction of the surface on the third direction side of the first portion 921. The second portion 925 forms a rectangle when viewed from the plate thickness direction.

[0054] Next, as shown in Figure 10b, the second portion 925 of the busbar base 924 is divided into three equal parts along the longitudinal direction of the first portion 921. Specifically, two cuts 925n are made at intermediate positions along the longitudinal direction of the second portion 925, dividing it into three equal parts along the longitudinal direction.

[0055] As a result, the second portion 925 is divided into three portions: the first divided portion 925a, the second divided portion 925b, and the third divided portion 925c. The second divided portion 925b extends in a third direction from a position shifted to one side in the longitudinal direction from the first divided portion 925a, and the third divided portion 925c extends in a third direction from a position shifted to one side in the longitudinal direction from the second divided portion 925b. In the example shown in Figure 10b, the second portion 925 is divided equally into three parts in the longitudinal direction, but it is not limited to equal division; unequal division is also acceptable.

[0056] Here, as shown in Figure 10c, the busbar base 924, after the second portion 925 has been divided into three longitudinal sections, is linear when viewed from the longitudinal direction. Next, as shown in Figure 10d, a force in the direction of the arrow is applied to the first divided portion 925a and the second divided portion 925b of the first divided portion 923a, second divided portion 923b, and third divided portion 925c. As a result, as shown in Figure 10e, the first divided portion 925a and the second divided portion 925b tilt, one to one side in the thickness direction and the other to the other side in the thickness direction. Consequently, the first divided portion 925a and the second divided portion 925b combine to form a V-shape when viewed from the longitudinal direction. Next, as shown in Figure 10f, the first divided portion 925a and the upper end of the first divided portion 925a are crushed in the direction of the arrow to form the first claw portion 92i and the second claw portion 92j.

[0057] Finally, although not shown in the diagram, the plate surface of the busbar base 924 is bent to create a shape that aligns with the circumferential direction of the stator core 60a. Note that this bending process may be performed at any other time, not necessarily at the end, such as after the step of punching out the busbar base 924 from the plate-like member, or after the step of dividing the second portion 925 into three parts. [Effects of Modified Example of the First Embodiment]

[0058] With the configuration described above, the motor 100 of this modified example can ensure a contact area with the coil end 65c, which is made of flat wire, through the first surface contact portion 92dc and the second surface contact portion 92fc. Furthermore, when connecting the coil end 65c to the busbar connection portion 192C, the inclined surfaces 92gs and 92hs allow for axial positioning of the coil end 65c and the busbar connection portion 192C without the use of jigs or the like. In addition, the third connection portion 92c allows for circumferential positioning of the coil end 65c and the busbar connection portion 192C. This prevents defects in crimping, welding, soldering, etc., caused by axial and circumferential misalignment between the coil end 65c and the busbar connection portion 92C. As a result, it is possible to provide a motor 100 having a fourth busbar 192 with a structure that can reduce connection defects caused by misalignment between the coil end 65c and the busbar connection portion 192C.

[0059] Furthermore, the first connecting portion 92a of the fourth busbar 192 has a first claw portion 92i that protrudes radially inward from the tip of the upper end portion 92d on the first direction side. In addition, the second connecting portion 92b has a second claw portion 92j that protrudes radially outward from the tip of the upper end portion 92f on the first direction side. The surfaces of the first claw portion 92i and the second claw portion 92j facing the second direction contact the upper surface 65h, which is the surface of the coil end portion 65c facing the first direction side.

[0060] With this configuration, the first claw portion 92i and the second claw portion 92j prevent the coil end 65c from coming out in the first direction. This also applies to the coil end 65c and busbar connection portion 192C after crimping and before welding or soldering, preventing the coil end 65c from coming out in the first direction due to faulty crimping or other reasons.

[0061] Furthermore, according to the manufacturing method of the motor 100 of this modified example, first, the lower surface 65g of the coil end 65c is brought into contact with both the inclined surfaces 92gs and 92hs of the first connecting portion 92a and the second connecting portion 92b, which form a V-shape when viewed from the circumferential direction. Next, the tip surface of the coil end 65c is abutted against the circumferentially facing surface 92k of the third connecting portion 92c. After that, an external force is applied to the upper end portions of the first connecting portion 92a and the second connecting portion 92b, and the fourth busbar 192 and the coil end 65c are connected by crimping the upper end portions of the first connecting portion 92a and the second connecting portion 92b.

[0062] This makes it easy to determine the axial and circumferential positions of the coil end 65c and the busbar connection 192C without using jigs or other fixtures. Furthermore, since the upper ends of the first connection 92a and the second connection 92b can be crimped while the axial and circumferential positions are determined, contact failures due to misalignment can be reduced. In addition, the connection can be more firmly connected between the coil end 65c and the fourth busbar 192 by reinforcing the connection by welding or soldering after crimping.

[0063] Furthermore, according to the manufacturing method of the fourth busbar 192 of this modified example, the second portion, which is a part of a single member, can be divided into three parts in the longitudinal direction to form the first divided portion 925a, the second divided portion 925b, and the third divided portion 925c. Furthermore, by bending the first divided portion 925a and the second divided portion 925b, the first connecting portion 92a, the second connecting portion 92b, and the third connecting portion 92c of the busbar connecting portion 192C can be formed. As a result, the number of processes can be reduced compared to the case where multiple members are combined, and thus the manufacturing time can be shortened. In addition, since materials can be used efficiently, the cost of materials can be reduced. [Second Embodiment] Next, a second embodiment of the present invention will be described. Figure 11 is a perspective view of a busbar unit 190 according to the second embodiment. The example shown in Figure 11 shows a state in which one coil 65 and the busbar connecting portion 93C of one second busbar 93 are connected.

[0064] The second embodiment is an embodiment that focuses on the second busbar 93 of the busbar unit 190 in a modified version of the first embodiment. The example shown in Figure 11 shows a busbar unit 190 having four types of busbars: the first to third busbars 92 to 94 according to the first to third embodiments and the fourth busbar 192 according to a modified version of the first embodiment. The busbar unit 190 is not limited to the configuration shown in Figure 11; it may consist of only one type of busbar, the second busbar 93, or it may consist of any three types or a combination of two types, including the second busbar 93. [Structure of the second busbar 93 and connection structure with the coil end 65c]

[0065] In the following, the structure of the second busbar 93 and the connection structure between the coil 65 and the second busbar 93 will be described in detail in the second embodiment. Figure 12a is a partial perspective view of the busbar unit 190 including the second busbar 93 before it is connected to the coil end 65c. Figure 12b is a partial perspective view of the busbar unit 190 including the second busbar 93 after it has been connected to the coil end 65c. As shown in Figure 12a, the busbar connection portion 93C, when not connected to the coil end 65c, has a first connection portion 93a and a second connection portion 93b.

[0066] The first connecting portion 93a extends straight in a first direction (+Z direction) from the circumferential end of the busbar body portion 93M. The second connecting portion 93b has a base end portion 93c that extends from a position circumferentially offset from the first connecting portion 93a of the busbar body portion 93M to a length midway along the first connecting portion 93a in the first direction. The second connecting portion 93b further has a support portion 93d that extends radially inward from the tip of the base end portion 93c, and a tip portion 93e that extends from the tip of the support portion 93d to a position slightly beyond the tip of the first connecting portion 93a in the first direction. The second connecting portion 93b further has a claw portion 93f that protrudes radially outward from the upper end of the tip portion 93e.

[0067] On the other hand, as shown in Figures 11 and 12b, when the busbar connection portion 93C and the coil end portion 65c are connected, the first surface contact portion 93ac, which is a part of the upper end of the radially inward-facing surface of the first connection portion 93a, and the outer surface 65d of the coil end portion 65c are in surface contact. In addition, the second surface contact portion 93ec, which is a part of the radially outward-facing surface of the tip portion 93e of the second connection portion 93b, and the inner surface 65f of the coil end portion 65c are in surface contact. Furthermore, the support surface 93dc, which is the surface of the support portion 93d of the second connection portion 93b facing the first direction, is in surface contact with the lower surface 65g of the coil end portion 65c. Furthermore, the surface of the claw portion 93f of the second connection portion 93b facing the second direction is in contact with the upper surface 65h of the coil end portion 65c. The claw portion 93f prevents the coil end 65c from coming out in the first direction (upward). [Connection process between the busbar connection portion 93C and the coil end 65c]

[0068] Next, the connection process between the busbar connection portion 93C and the coil end 65c, which is included in the manufacturing process of the motor 100, will be described based on Figures 13a, 13b, and 13c. Figures 13a to 13c show the connection process between the busbar connection portion 93C of the second busbar 93 and the coil end 65c. Figure 13a shows the first connection portion 93a and the second connection portion 93b of the busbar connection portion 93C before it is connected to the coil end 65c. Before it is connected to the coil, the second connection portion 93b is slightly inclined radially inward.

[0069] As shown in Figures 13a and 13b, first, the coil end 65c is placed on the support surface 93dc of the support portion 93d of the second connection portion 93b. At this time, the support surface 93dc and the lower surface 65g of the coil end 65c are brought into surface contact. Furthermore, the outer surface 65d of the coil end 65c is abutted against the first surface contact portion 93ac of the first connection portion 93a. This determines the axial and radial positions of the coil end 65c and the busbar connection portion 93C.

[0070] Next, as shown in Figure 13b, an external force is applied to the upper ends of the first connection portion 93a and the second connection portion 93b in the direction indicated by the arrow. That is, the upper ends of the first connection portion 93a and the second connection portion 93b are crimped. As a result, as shown in Figure 13c, the second surface contact portion 93ec of the tip portion 93e of the second connection portion 93b makes surface contact with the inner surface 65f of the coil end portion 65c. Furthermore, the surface of the claw portion 93f of the second connection portion 93b facing the second direction comes into contact with the upper surface 65h of the coil end portion 65c. In addition, even after crimping, contact is maintained between the first surface contact portion 93ac of the first connection portion 93a and the outer surface 65d of the coil end portion 65c. Moreover, contact is maintained between the support surface 93dc of the second connection portion 93b and the lower surface 65g of the coil end portion 65c. Furthermore, after crimping, the connection between the busbar connection portion 93C and the coil end portion 65c can be reinforced as needed, for example, by welding or soldering. [Method for manufacturing the second busbar 93]

[0071] Next, the manufacturing method of the second busbar 93 will be described based on Figures 14a, 14b, 14c, 14d, 14e, 14f, and 14g. Figures 14a to 14g show the manufacturing process of the second busbar 93. Figures 14a and 14b are views of the busbar base 930 or the busbar base during processing, viewed from the plate side. Figures 14c to 14g are views of the busbar base 930 during or after processing, viewed from one side in the longitudinal direction.

[0072] First, a busbar base 930 in the shape shown in Figure 14a is punched out from a conductive plate-like member (not shown) by punching. Specifically, the busbar base 930 has a first rectangular bar-shaped portion 931 and a second portion 933 that extends continuously from one end of the first portion 931 in the longitudinal direction. The first portion 931 and the second portion 933 are parts of a single member.

[0073] The second portion 933 extends continuously toward the third direction from one end of the longitudinal side of the surface on the third direction side, which is one of the directions normal to the thickness direction and the longitudinal direction of the first portion 931. The second portion 933 has a stepped shape when viewed from the thickness direction. Specifically, a portion of the second portion 933 on one longitudinal side is longer along the third direction than the other portion on the other side. As a result, a step is formed between the longer portion of the second portion 933 and the shorter portion of the other side.

[0074] Next, as shown in Figure 14b, the second portion 933 of the busbar base 930 is divided into two equal parts in the longitudinal direction of the first portion 931. Specifically, a cut 933n is made at an intermediate position between the long portion and the short portion in the longitudinal direction of the second portion 933, dividing the second portion 933 into two parts in the longitudinal direction.

[0075] As a result, the second portion 933 is divided into two portions: a first divided portion 933a corresponding to the shorter portion and a second divided portion 933b corresponding to the longer portion. The second divided portion 933b extends in a third direction from a position shifted to one side in the longitudinal direction from the first divided portion 933a. In the example shown in Figure 14b, the second portion 933 is divided equally into two parts in the longitudinal direction, but it is not limited to equal division; it may also be divided unequally.

[0076] Here, as shown in Figure 14c, the busbar base 930, after the second portion 933 is divided into two longitudinal sections, becomes straight when viewed from the longitudinal direction. Subsequently, as shown in Figure 14d, a bending force is applied to the portion at the midpoint of the second divided portion 933b, bending the portion closer to the tip than the midpoint in the direction of the arrow. As a result, the tip portion of the second divided portion 933b bends to one side in the thickness direction. Specifically, the tip of the tip portion of the second divided portion 933b faces one side in the thickness direction.

[0077] Next, as shown in Figure 14e, a bending force is applied to the portion of the second divided portion 933b at an intermediate length position in the bent portion, bending the portion closer to the tip than the intermediate length position in the direction of the arrow. As a result, the tip portion of the bent portion bends toward the third direction. Specifically, the tip of the tip portion of the bent portion faces toward the third direction. Subsequently, as shown in Figure 14f, the upper end of the second divided portion 933b is crushed in the direction of the arrow to form the claw portion 93f.

[0078] Next, as shown in Figure 14g, a force is applied in one direction in the thickness direction to the upper end portion of the second divided portion 933b after the claw portion 93f has been formed, causing the entire second divided portion 933b to tilt in the direction of the arrow. As a result, the entire second divided portion 933b is slightly tilted to one side in the thickness direction.

[0079] Finally, although not shown in the diagram, the plate surface of the busbar base 930 is bent to create a shape that aligns with the circumferential direction of the stator core 60a. Note that this bending process may be performed at any other time, not necessarily at the end, such as after the step of punching out the busbar base 930 from the plate-like member, or after the step of dividing the second portion 933 into two. [Effects of the second embodiment]

[0080] With the configuration described above, the motor 100 of the second embodiment can secure a contact area with the coil end 65c, which is made of flat wire, by the first surface contact portion 93ac and the second surface contact portion 93ec. Furthermore, when connecting the coil end 65c to the busbar connection portion 93C, the support surface 93dc of the support portion 93d can position the coil end 65c and the busbar connection portion 93C in the axial direction without using a jig or the like. In addition, the first surface contact portion 93ac of the first connection portion 93a can position the coil end 65c and the busbar connection portion 93C in the radial direction. This prevents defects in crimping, welding, soldering, etc., caused by axial and radial misalignment between the coil end 65c and the busbar connection portion 93C. As a result, it is possible to provide a motor 100 having a second busbar 93 with a structure that can reduce connection defects caused by misalignment between the busbar and the coil end 65c. Furthermore, the second connecting portion 93b of the second busbar 93 has a claw portion 93f that protrudes from the tip of the first direction side of the tip portion 93e toward the other side in the thickness direction (radially outward). The surface of the claw portion 93f facing the second direction contacts the upper surface 65h of the coil end portion 65c.

[0081] With this configuration, the claw portion 93f prevents the coil end 65c from coming loose in the first direction. This also applies to the coil end 65c and busbar connection portion 93C after crimping and before welding or soldering, preventing the coil end 65c from coming loose in the first direction due to faulty crimping or other reasons.

[0082] Furthermore, according to the manufacturing method of the motor 100 of the second embodiment, first, the coil end 65c is positioned such that its lower surface 65g is in surface contact with the support surface 93dc of the support portion 93d of the second connection portion 93b, and its outer surface 65d is in surface contact with the first surface contact portion 93ac of the first connection portion 93a. Next, an external force is applied to the upper end portion of the first connection portion 92a and the tip portion 93e of the second connection portion 92b to crimp them. This causes the first surface contact portion 93ac of the first connection portion 93a and the second surface contact portion 93ec of the second connection portion 93b to be in surface contact with the outer surface 65d and inner surface 65f of the coil end 65c.

[0083] This makes it easy to determine the axial and radial positions of the coil end 65c and the busbar connection 93C without using jigs or other fixtures. Furthermore, since the upper end portion of the first connection 93a and the tip portion 93e of the second connection 93b can be crimped while the axial and radial positions are determined, contact failures due to misalignment can be reduced. In addition, the connection can be made more firmly connected between the coil end 65c and the second busbar 93 by reinforcing the connection by welding or soldering after crimping.

[0084] Furthermore, according to the manufacturing method of the second busbar 93 of the second embodiment, the stepped second portion 933, which is a part of a single member and is viewed from the plate thickness direction, can be divided into two longitudinal parts to form the first divided portion 933a and the second divided portion 933b. Furthermore, by bending the second divided portion 933b, the first connecting portion 93a and the second connecting portion 93b of the busbar connecting portion 93C can be formed. As a result, the number of processes can be reduced compared to the case where multiple members are combined, and thus the manufacturing time can be shortened. In addition, since materials can be used efficiently, the cost of materials can be reduced. [Third Embodiment] Next, a third embodiment will be described. Figure 15 is a perspective view of a busbar unit 190 according to the third embodiment. The example shown in Figure 15 shows a state in which one coil 65 and the busbar connecting portion 94C of one third busbar 94 are connected.

[0085] The third embodiment is an embodiment in which the second busbar 93 of the busbar unit 190 in the modified version of the first embodiment is applied. The example shown in Figure 15 shows a busbar unit 190 having four types of busbars: the first to third busbars 92 to 94 according to the first to third embodiments and the fourth busbar 192 according to the modified version of the first embodiment. The busbar unit 190 is not limited to the configuration shown in Figure 15; it may consist of only one type of busbar, the third busbar 94, or it may consist of any three or two types of busbars including the third busbar 94. [Structure of the third busbar 94 and connection structure with the coil end 65c]

[0086] In the following, the structure of the third busbar 94 and the connection structure between the coil 65 and the third busbar 94 will be described in detail in the third embodiment. Figure 16a is a partial perspective view of the busbar unit 190 including the third busbar 94 before it is connected to the coil end 65c. Figure 16b is a partial perspective view of the busbar unit 190 including the third busbar 94 after it has been connected to the coil end 65c. As shown in Figure 16a, the busbar connection portion 94C has a first connection portion 94a and a second connection portion 94b.

[0087] The first connecting portion 94a extends straight in the first direction (+Z direction) from the circumferential end of the busbar body portion 94M. The second connecting portion 94b is formed by a part of the first connecting portion 94a projecting radially inward. The second connecting portion 94b, together with the other part of the first connecting portion 94a, forms a hole portion 94h. A part of the radially inward-facing surface of the other part of the first connecting portion 94a constitutes a first surface contact portion 94c. The inner circumferential portion constituting the hole portion 94h of the second connecting portion 94b has a support portion 94d which faces the first direction, a second surface contact portion 94e which faces radially outward, and a third surface contact portion 94f which faces the second direction. The support portion 94d has a surface that follows the lower surface 65g of the coil end 65c, and the second surface contact portion 94e has a surface that follows the outer surface 65d of the coil end 65c facing radially inward. The third surface contact portion 94f has a surface that follows the upper surface 65h of the coil end 65c. That is, the hole portion 94h has an inner circumference that follows the outer shape of the coil end 65c. In addition, the other part of the first connecting portion 94a has a cavity 94gr formed in the portion that protrudes as the second connecting portion 94b. Furthermore, the inner diameter of the hole portion 94h is configured to be slightly wider than the outer diameter of the coil end 65c. Specifically, the inner diameter is configured to be such that the coil end 65c can be fitted into the hole portion 94h.

[0088] On the other hand, as shown in Figures 16a and 16b, when the busbar connection portion 94C and the coil end portion 65c are connected, the first surface contact portion 94c of the first connection portion 94a and the outer surface 65d of the coil end portion 65c are in surface contact. In addition, the second surface contact portion 94e, which is one of the surfaces constituting the hole portion 94h of the second connection portion 94b, and the inner surface 65f of the coil end portion 65c are in surface contact. Furthermore, the support portion 94d, which is one of the surfaces constituting the hole portion 94h of the second connection portion 94b, and the lower surface 65g of the coil end portion 65c are in surface contact. Furthermore, the third surface contact portion 94f, which is one of the surfaces constituting the hole portion 94h of the second connection portion 94b, and the upper surface 65h of the coil end portion 65c are in surface contact. [Connection process between busbar connection portion 94C and coil end portion 65c]

[0089] Next, the connection process between the busbar connection portion 94C and the coil end 65c, which is one of the manufacturing processes of the motor 100, will be described based on Figures 17a, 17b, and 17c. Figures 17a to 17c show the connection process between the busbar connection portion 94C of the third busbar 94 and the coil end 65c. Figure 17a shows the first connection portion 94a and the second connection portion 94b of the busbar connection portion 94C before it is connected to the coil end 65c.

[0090] As shown in Figures 17a and 17b, the coil end 65c is inserted into the hole 94h from one side to the other in the circumferential direction. At this time, as shown in Figure 17c, the tip portion of the coil end 65c passes through the hole 94h and is inserted until the circumferentially facing surface of the coil lead portion 65b contacts one side of the second connection portion 94b in the circumferential direction. As a result, the outer surface 65d of the coil end 65c makes surface contact with the first surface contact portion 94c of the first connection portion 94a, with the cavity 94gr in between. In addition, the inner surface 65f of the coil end 65c makes surface contact with the second surface contact portion 94e of the second connection portion 94b, and the lower surface 65g of the coil end 65c makes surface contact with the support portion 94d of the second connection portion 94b. Furthermore, the upper surface 65h of the coil end 65c makes surface contact with the third surface contact portion 94f of the second connection portion 94b. Furthermore, the axial, circumferential, and radial positions of the coil end 65c and the busbar connection portion 94C are determined. In addition, after inserting the coil end 65c into the hole portion 94h, the connection between the busbar connection portion 94C and the coil end 65c can be reinforced as needed, for example, by welding or soldering. [Manufacturing method of the third busbar 94]

[0091] Next, the manufacturing method of the third busbar 94 will be described based on Figures 18a, 18b, 18c, 18d, and 18e. Figures 18a to 18e show the manufacturing process of the third busbar 94. Figures 18a and 18b are views of the busbar base 940 or the busbar base during processing, viewed from the plate side. Figures 18c to 18e are views of the busbar base 940 during or after processing, viewed from one side in the longitudinal direction.

[0092] First, a busbar base 940 in the shape shown in Figure 18a is punched out from a conductive plate-like member (not shown) by punching. Specifically, the busbar base 940 has a first rectangular bar-shaped portion 941 and a second portion 943 that extends continuously from one end of the first portion 941 in the longitudinal direction. The first portion 941 and the second portion 943 are parts of a single member. The second portion 943 extends continuously toward the third direction from one end of the longitudinal direction of the surface on the third direction side, which is one of the directions normal to the thickness direction and the longitudinal direction of the first portion 941. The second portion 943 has a rectangular shape when viewed from the thickness direction.

[0093] Next, as shown in Figure 18b, two cuts 943n are made along the third direction at positions separated from the longitudinal center of the second portion 943 of the busbar base 940, one on one side and the other on the other side in the longitudinal direction. At this time, the cuts are made only on the inside of the second portion 943 so that the second portion 943 does not separate into multiple parts in the circumferential direction. Hereafter, the part outside the two cuts 243n will be called the third portion 943a, and the part inside the two cuts will be called the fourth portion 943b. In the example shown in Figure 18b, the longitudinal width of the fourth portion 943b is the same as the width of each divided portion when the second portion 943 is divided into three equal parts in the longitudinal direction. Note that the two cuts 243n may be made at positions that result in unequal divisions, not just equal divisions.

[0094] Here, as shown in Figure 18c, after the cut 943n is made in the second portion 943, the busbar base 940 becomes straight when viewed from the longitudinal direction. Subsequently, as shown in Figure 18d, a bending and stretching processing force is applied to the fourth portion 943b in the direction of the arrow. As a result, as shown in Figure 18d, the fourth portion 943b is made to protrude to one side in the thickness direction and is deformed into an arch shape. As a result, a hole 943h is formed. The hole 943h is deformed to a shape that follows the outer shape of the coil end 65c. Furthermore, as shown in Figure 18e, by bending and stretching the fourth portion 943b to protrude to one side in the thickness direction, a cavity 943gr is formed in the third portion 943a, as shown in Figure 18e.

[0095] Finally, although not shown in the diagram, the plate surface of the busbar base 940 is bent to create a shape that conforms to the circumferential direction of the stator core 60a. Note that this bending process may be performed at any other time, not necessarily at the end, such as after the step of punching out the busbar base 940 from the plate-like member, or after bending and straightening the fourth portion 943b. [Other manufacturing methods for the third busbar 94]

[0096] Next, other manufacturing methods for the third busbar 94 will be described based on Figures 19a, 19b, 19c, 19d, 19e, 19f, and 19g. Figures 19a to 19g show other manufacturing processes for the third busbar 94. Figures 19a and 19b are views of the busbar base 940 or the busbar base during processing, viewed from the plate side. Figures 19c to 19g are views of the busbar base 940 during or after processing, viewed from one side in the longitudinal direction.

[0097] First, a busbar base 940 in the shape shown in Figure 19a is punched out from a conductive plate-like member (not shown) by punching. Specifically, the busbar base 940 has a flat rectangular bar-shaped first portion 941 and a second portion 943 that extends continuously from one end of the first portion 941 in the longitudinal direction in a third direction which is one of the directions normal to the thickness direction and the longitudinal direction.

[0098] Next, as shown in Figure 19b, an incision 943n is made in the second part 943 of the busbar base 940 to separate it into a third part 943c, which is a gate-shaped outer part with a rectangular opening, and a fourth part 943d, which is an inner part that closes this gate-shaped rectangular opening. That is, the third part 943c and the fourth part 943d are separated into two parts while remaining connected to the first part 941. In the example shown in Figure 19b, the longitudinal width of the fourth part 943d is the same as the width of each divided part when the second part 943 is divided into three equal parts longitudinally. Note that the incision 943n may be formed at a position where the width is not equal to the divided parts, but also at a position where the width is unequal. Here, as shown in Figure 19c, the busbar base 940 after the incision 943n has been made in the second part 943 becomes straight when viewed from the longitudinal direction.

[0099] Next, as shown in Figure 19d, a bending force is applied to the upper end of the base portion of the fourth part 943d, using the base portion as the base end, and the portion on the tip side of the upper end portion is bent in the direction of the arrow. As a result, as shown in Figure 19d, the tip portion of the fourth part 943d bends to one side in the thickness direction. Specifically, the tip of the tip portion of the fourth part 943d faces one side in the thickness direction.

[0100] Next, as shown in Figure 19e, a bending and straightening force is applied to the intermediate portion of the coil end 65c of the bent portion of the fourth portion 943d, which corresponds to the length of the shorter side of the cross-section. This causes the portion closer to the tip than the intermediate length portion to bend in the direction of the arrow in Figure 19e and to be stretched in the third direction. As a result, as shown in Figure 19e, the tip portion of the bent portion is bent and stretched in the third direction.

[0101] Next, as shown in Figure 19f, a bending force is applied to the intermediate portion of the coil end 65c of the fourth portion 943d that is bent towards the third direction, at a length corresponding to the length of the long side of the cross-section. This bends the portion closer to the tip than the intermediate length portion in the direction of the arrow in Figure 19f. As a result, the tip of the fourth portion 943d overlaps with the surface 943cs of the third portion 943c, which faces the fourth direction, opposite to the third direction, on the inside of the opening. Here, the surface of the tip of the fourth portion 943d facing the third direction is in surface contact with the surface 943cs of the third portion 943c.

[0102] Finally, although not shown in the diagram, the plate surface of the busbar base 940 is bent to create a shape that conforms to the circumferential direction of the stator core 60a. Note that this bending process is not performed at the end, but at any other time, such as after the process of punching out the busbar base 940 from the plate-like member, or after the process of bending and straightening the fourth portion 943b. Although the manufacturing method described is for the case where the cross-section of the flat wire of the coil end 65c is rectangular, if the cross-section of the flat wire is square, the length of each side will be the same, so the bending process is performed at the intermediate position where the sides are of the same length.

[0103] Furthermore, the third busbar 94 after processing by another manufacturing method, as shown in Figure 19f, has a first connecting portion 94a which includes a first side portion 94m, a second side portion 94n, and an intermediate portion 94g. The first side portion 94m extends in a first direction from the busbar body portion 94M, and the intermediate portion 94g extends in one direction in the circumferential direction from the upper end of the first side portion 94m. The second side portion 94n extends in a second direction from the tip of the intermediate portion 94g. The first side portion 94m and the second side portion 94n constitute the first surface contact portion 94c. [Effects of the third embodiment]

[0104] With the configuration described above, the motor 100 of the third embodiment can secure a contact area with the coil end 65c, which is made of flat wire, through the first surface contact portion 94c, the support portion 94d, the second surface contact portion 94e, and the third surface contact portion 94f. Furthermore, when connecting the coil end 65c to the busbar connection portion 93C, the axial and radial positioning of the coil end 65c and the busbar connection portion 94C can be achieved by inserting the coil end 65c into the hole portion 94h without using a jig or the like. In addition, the circumferential positioning of the coil end 65c and the busbar connection portion 93C can be achieved by inserting the coil end 65c into the hole portion 94h until the circumferentially facing surface of the coil lead portion 65b abuts against one end face in the circumferential direction of the first connection portion 94a. This prevents defects such as welding and soldering caused by misalignment of the coil end 65c and the busbar connection portion 94C in the axial, radial, and circumferential directions. As a result, it is possible to provide a motor 100 having a third busbar 94 with a structure that can reduce connection failures caused by misalignment between the busbar and the coil end 65c.

[0105] Furthermore, according to the manufacturing method of the third busbar 94 of the third embodiment and other manufacturing methods, the first connecting portion 94a and the second connecting portion 94b of the busbar connecting portion 94C can be formed by cutting and bending the rectangular second portion 943, which is a part of a single member and is viewed from the plate thickness direction. As a result, the number of processes can be reduced compared to the case where multiple members are combined, and thus the manufacturing time can be shortened. In addition, since materials can be used efficiently, the cost of materials can be reduced. [Fourth Embodiment]

[0106] Next, a fourth embodiment will be described. Figure 20 is a partial perspective view of the busbar unit 190A according to the fourth embodiment. The example shown in Figure 20 shows a state in which the coil ends 65c of three coils 65 are connected to two second busbars 93 and one fourth busbar 192, respectively. As shown in Figure 20, the busbar unit 190A according to the fourth embodiment is a modified version of the first embodiment and the busbar units 190 of the second and third embodiments, with the busbar holder 91 removed. The first busbar 92 (not shown), the second busbar 93, the third busbar 94 (not shown), and the fourth busbar 192 can all be positioned by sandwiching the coil ends 65c, so positioning by the busbar holder 91 is unnecessary.

[0107] However, in order to prevent electrical conductivity between the busbars, the busbar unit 190A is coated with an insulating material on the side surfaces of at least the busbar body portions 92M, 93M, and 94M, although this is not shown in the illustration. Note that the coating is not the only method; other configurations are also acceptable, such as covering with an insulating tube or placing an insulator between adjacent busbars, as long as electrical conductivity between the busbars can be prevented. [Effects of the Fourth Embodiment]

[0108] With the configuration described above, the motor 100 of the fourth embodiment has a busbar unit 190A in which the busbar holder 91 is removed from the busbar unit 190, thus reducing the number of parts required to manufacture the busbar unit. This reduces the cost of manufacturing the busbar unit. [Other modifications]

[0109] The embodiments and their variations described above should be considered in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the embodiments described above, and all modifications within the meaning and scope of the claims are intended to be included.

[0110] In the second embodiment described above, the second connection portion 93b of the busbar connection portion 93C is tilted inward in the radial direction, and the coil end portion 65c is positioned axially with respect to this tilted second connection portion 93b before being crimped. The configuration is not limited to this, however, for example, the second connection portion 93b may not be tilted inward in the radial direction, and the crimping process after positioning the coil end portion 65c in the axial and radial directions may be omitted. In this case, the connection between the coil end portion 65c and the busbar connection portion 93C may be reinforced by welding or soldering, for example. Furthermore, although the present invention was applied to an axial gap type motor in the above embodiment and its modifications, it may also be applied to a radial gap type motor. When applied to a radial gap type motor, the stator core can take on a cylindrical shape. The present technology can take on the following configurations. (1) A stator having a cylindrical or annular stator core having a plurality of slots arranged in the circumferential direction, a plurality of coils inserted into the plurality of slots, and a plurality of plate-shaped busbars connected to the plurality of coils, and a rotor having a central axis and rotatable about the central axis relative to the stator, wherein each of the plurality of busbars has a busbar body portion extending along the circumferential direction, and a busbar connection portion extending from the busbar body portion toward a first direction which is one side of the direction normal to the circumferential direction and the thickness direction of the busbar, wherein each of the plurality of coils is constructed by winding a flat wire around the stator core, and has a coil end which is the end of the flat wire spaced apart in the first direction relative to the busbar body portion. The motor comprises a busbar connection portion having a support portion that contacts a portion of the coil end in a second direction opposite to the first direction to define the position of the coil end in the central axis direction, and a first surface contact portion and a second surface contact portion that make surface contact with a first surface, which is one side of the coil end in the thickness direction, and a second surface, which is the other side.

[0111] (2) The motor according to (1), wherein the coil ends are arranged such that the first surface and the second surface face radially inward and radially outward.

[0112] (3) The busbar connection portion has: a first connection portion having a first support portion extending diagonally from the busbar body portion toward one side in the first direction and the thickness direction, and a first surface contact portion extending from the tip of the first support portion toward the first direction and making surface contact with one of the first and second surfaces of the coil end; a second connection portion having a second support portion extending diagonally from a position offset in the circumferential direction from the first connection portion of the busbar body portion toward the other side in the first direction and the thickness direction, and a second surface contact portion extending from the tip of the second support portion toward the first direction and making surface contact with the other of the first and second surfaces of the coil end; and the support portion is the inclined surface on the inside of the V-shaped portion formed by the first support portion and the second support portion when viewed from the circumferential direction. The motor according to (1) or (2), wherein the coil end has a portion on the second direction side in contact with the support portion, and the first surface and the second surface are in surface contact with the first surface contact portion and the second surface contact portion.

[0113] (4) The motor according to (3), wherein the busbar connection portion further has a third connection portion extending in the first direction from a position offset to one side in the circumferential direction from the first connection portion and the second connection portion of the busbar body, and the tip of the coil end further contacts the surface of the third connection portion facing the circumferential direction.

[0114] (5) The motor according to (3) or (4), wherein the first connecting portion has a first claw portion provided at the tip on the first direction side projecting to one side in the plate thickness direction, and the second connecting portion has a second claw portion provided at the tip on the first direction side projecting to the other side in the plate thickness direction, and the first claw portion and the second claw portion are in contact with the surface of the coil end facing the first direction side.

[0115] (6) The busbar connection portion has: a first connection portion extending from the busbar body in the first direction and having a first surface contact portion on its tip side facing one side in the thickness direction that makes surface contact with one of the first and second surfaces of the coil end; a base end portion extending from a position offset in the circumferential direction from the first connection portion of the busbar body to a length position midway between the first connection portion and the first connection portion in the first direction; a support portion extending from the tip of the base end portion in the one side in the thickness direction that makes contact with the surface of the coil end facing the second direction; and a tip portion extending from the tip of the support portion in the first direction and having a second surface contact portion on its tip side facing the other side in the thickness direction that makes surface contact with the other of the first and second surfaces of the coil end; The motor according to (1) or (2), wherein the coil end has a surface facing the second direction in contact with the surface facing the first direction of the support portion, and the first surface and the second surface are in surface contact with the first surface contact portion and the second surface contact portion. (7) The motor according to (6), wherein the second connecting portion has a claw portion provided at the tip of the tip portion on the first direction side, projecting to the other side in the plate thickness direction, and the claw portion is in contact with the surface of the coil end facing the first direction.

[0116] (8) The motor according to (1) or (2), wherein the busbar connection portion comprises: a first connection portion extending from the busbar body portion toward the first direction and having a first surface contact portion on a surface facing one side in the plate thickness direction that makes surface contact with one of the first and second surfaces of the coil end; and a second connection portion formed such that at least a part of it protrudes from the first connection portion toward one side in the plate thickness direction and together with the first connection portion forms a hole that surrounds a part of the coil end, wherein the second connection portion comprises, on the inner circumference forming the hole portion, a support portion that makes surface contact with the surface of the coil end facing the second direction and defines the position in the central axis direction, a second surface contact portion that makes surface contact with the other of the first and second surfaces of the coil end, and a third surface contact portion that makes surface contact with the surface of the coil end facing the first direction. (9) The motor according to (8), wherein the first connecting portion has a first side portion extending from the busbar body portion toward the first direction, an intermediate portion extending from the tip of the first side portion toward one side in the circumferential direction, and a second side portion extending from the tip of the intermediate portion toward the second direction, the first surface contact portion is composed of the surfaces of the first side portion and the second side portion facing one side in the thickness direction, the second connecting portion further has a base end portion extending from a position between the first side portion and the second side portion in the circumferential direction of the busbar body portion toward an intermediate length position of the first connecting portion toward the first direction, the support portion extends from the tip of the base end portion toward one side in the thickness direction, the second surface contact portion extends from the tip of the support portion toward the first direction, and the third surface contact portion extends from the tip of the second surface contact portion toward the other side in the thickness direction toward the second direction toward the intermediate portion toward the second direction.

[0117] 100...Motor, 20...Rotor, 20a...Center shaft, 60...Stator, 60a...Stator core, 62...Slot, 64...Core section, 65...Coil, 65c...Coil end, 65d...First surface (outer surface), 65f...Second surface (inner surface), 65g...Third surface (bottom surface), 65h...Fourth surface (top surface), 90, 190, 190A...Busbar unit, 91...Busbar holder, 92...First busbar, 93...Second busbar, 94...Third busbar, 192...Fourth busbar, 92C-94C, 92C'...Busbar connection section, 92M-94M...Bus Bar body part, 92a, 93a, 94a...first connection part, 92b, 93b, 94b...second connection part, 92c...third connection part, 92d, 92f...upper end part, 92dc, 93ac, 94c...first surface contact part, 92fc, 93ec, 94e...second surface contact part, 92g...first support part , 92h...Second support part, 92gs, 92hs...Slanted surface, 92i...First claw part, 92j...Second claw part, 93c...Base end part, 93d, 94d...Support part, 93f...Claw part, 94f...Third surface contact part, 94h...Hole part, 94g...Intermediate part, 94m...First side part, 94n...Second side part

Claims

1. A stator having a cylindrical or annular stator core having a plurality of slots arranged in the circumferential direction, a plurality of coils inserted into the plurality of slots, and a plurality of plate-shaped busbars connected to the plurality of coils, and a rotor having a central axis and rotatable about the central axis relative to the stator, wherein each of the plurality of busbars has a busbar body portion extending along the circumferential direction, and a busbar connection portion extending from the busbar body portion toward a first direction which is one side of the direction normal to the circumferential direction and the thickness direction of the busbar, wherein each of the plurality of coils is constructed by winding a flat wire around the stator core, and has a coil end which is the end of the flat wire spaced apart in the first direction relative to the busbar body portion. The motor comprises a busbar connection portion having a support portion that contacts a portion of the coil end in a second direction opposite to the first direction to define the position of the coil end in the central axis direction, and a first surface contact portion and a second surface contact portion that make surface contact with a first surface, which is one side of the coil end in the thickness direction, and a second surface, which is the other side.

2. The motor according to claim 1, wherein the coil ends are arranged such that the first surface and the second surface face radially inward and radially outward.

3. The busbar connection portion has: a first connection portion having a first support portion extending diagonally from the busbar body portion toward one side in the first direction and the thickness direction, and a first surface contact portion extending from the tip of the first support portion toward the first direction and making surface contact with one of the first and second surfaces of the coil end; a second connection portion having a second support portion extending diagonally from a position offset in the circumferential direction from the first connection portion of the busbar body portion toward the other side in the first direction and the thickness direction, and a second surface contact portion extending from the tip of the second support portion toward the first direction and making surface contact with the other of the first and second surfaces of the coil end; and the support portion is the inclined surface on the inside of the V-shaped portion formed by the first support portion and the second support portion when viewed from the circumferential direction. The motor according to claim 2, wherein the coil end has a portion on the second direction side in contact with the support portion, and the first surface and the second surface are in surface contact with the first surface contact portion and the second surface contact portion.

4. The motor according to claim 3, wherein the busbar connection portion further has a third connection portion extending toward the first direction from a position offset to one side in the circumferential direction from the first connection portion and the second connection portion of the busbar body, and the tip of the coil end further contacts the circumferentially facing surface of the third connection portion.

5. The busbar connection portion has: a first connection portion extending from the busbar body in a first direction and having a first surface contact portion on its tip side facing one side in the thickness direction that makes surface contact with one of the first and second surfaces of the coil end; a base end portion extending from a position offset in the circumferential direction from the first connection portion of the busbar body to a length position midway between the first connection portion and the first connection portion in a first direction; a support portion extending from the tip of the base end in a first direction and making contact with the surface of the coil end facing the second direction; and a tip portion extending from the tip of the support portion in a first direction and having a second surface contact portion on its tip facing the other side in the thickness direction that makes surface contact with the other of the first and second surfaces of the coil end; The motor according to claim 2, wherein the coil end has a surface facing the second direction in contact with the surface of the support portion facing the first direction, and the first surface and the second surface are in surface contact with the first surface contact portion and the second surface contact portion.

6. The motor according to claim 2, wherein the busbar connection portion comprises: a first connection portion extending from the busbar body portion toward the first direction and having a first surface contact portion on a surface facing one side in the thickness direction that makes surface contact with one of the first and second surfaces of the coil end; and a second connection portion formed such that at least a portion of it protrudes from the first connection portion toward one side in the thickness direction and together with the first connection portion forms a hole that surrounds a portion of the coil end, wherein the second connection portion comprises, on the inner circumference forming the hole portion, a support portion that makes surface contact with the surface of the coil end facing the second direction to define the position in the central axis direction, a second surface contact portion that makes surface contact with the other of the first and second surfaces of the coil end, and a third surface contact portion that makes surface contact with the surface of the coil end facing the first direction.

7. The motor according to claim 6, wherein the first connecting portion has a first side portion extending from the busbar body portion toward a first direction, an intermediate portion extending from the tip of the first side portion toward one side in the circumferential direction, and a second side portion extending from the tip of the intermediate portion toward a second direction, the first surface contact portion is composed of surfaces of the first side portion and the second side portion facing one side in the thickness direction, the second connecting portion further has a base end portion extending from a position between the first side portion and the second side portion in the circumferential direction of the busbar body portion toward an intermediate length position of the first connecting portion toward the first direction, the support portion extends from the tip of the base end portion toward one side in the thickness direction, the second surface contact portion extends from the tip of the support portion toward the first direction, and the third surface contact portion extends from the tip of the second surface contact portion toward the other side in the thickness direction toward the second direction toward the intermediate portion toward the second direction.

8. A manufacturing method for manufacturing the motor described in claim 1, comprising the steps of: bringing the other portion of the coil end in the second direction into contact with the support portion of the busbar connection; and bringing the first surface contact portion and the second surface contact portion of the busbar connection into surface contact with the first surface and the second surface contact portion of the coil end in contact with the support portion.

9. A manufacturing method for manufacturing the motor described in claim 3, wherein the first connection portion of the busbar connection portion before connection to the coil end extends straight diagonally from the busbar body portion toward one of the first direction and the thickness direction of the stator core, the second connection portion of the busbar connection portion before connection to the coil end portion extends straight diagonally from a position offset in the circumferential direction from the first connection portion of the busbar body portion toward the other side of the first direction and the thickness direction, and the steps of arranging each of the coil ends of the plurality of coils inside the V-shaped portion formed by the first connection portion and the second connection portion of the busbar connection portion corresponding to each coil end when viewed from the circumferential direction, and arranging each coil end in a position where the portion of each coil end facing the second direction is in contact with the inner surface of the V-shaped portion, A manufacturing method comprising the steps of applying an external force from the outside in the thickness direction to the tip portions of the first and second connecting portions, which include a portion facing the coil end and positioned in contact with the inner surface of the V-shaped portion, thereby plastically deforming each of the tip portions, and bringing the inner surfaces of one and the other of each tip portion into surface contact with the first and second surfaces of the coil end.

10. A manufacturing method for manufacturing the motor described in claim 4, wherein the first connection portion of the busbar connection portion before connection to the coil end extends diagonally and straight from the busbar body portion toward one of the first direction and the thickness direction of the stator core, the second connection portion of the busbar connection portion before connection to the coil end portion extends diagonally and straight from a position offset in the circumferential direction from the first connection portion of the busbar body portion toward the other side of the first direction and the thickness direction, and each coil end of the plurality of coils is positioned such that, when viewed from the circumferential direction of the busbar connection portion corresponding to each coil end, the surface on the longer side of the cross-section faces the thickness direction, and the portion of each coil end facing the second direction contacts the inner surface of the V-shaped portion, and the tip of each coil end contacts the surface of the third connection portion facing the circumferential direction. A manufacturing method comprising the steps of applying an external force from the outside in the thickness direction to the tip portions of the first and second connecting portions, which include a portion facing the coil end and positioned in contact with the inner surface of the V-shaped portion and the surface facing the circumferential direction, thereby plastically deforming each of the tip portions, and bringing the inner surfaces of one and the other of each tip portion into surface contact with the first and second surfaces of the coil end.

11. A manufacturing method for manufacturing the motor described in claim 5, comprising: a step of positioning each of the plurality of coils such that the surface of each coil end facing the second direction is in surface contact with the surface of the support portion corresponding to each coil end facing the first direction, and the surface of each coil end facing one side in the thickness direction is in surface contact with the surface of the first connection portion corresponding to each coil end facing the other side in the thickness direction; and a step of applying an external force from the outside in the thickness direction to the tip portion of the first connection portion, including the portion facing the coil end positioned in surface contact, and to the tip portion of the second connection portion, respectively, to plastically deform a part of the second connection portion, thereby bringing the surface of the first connection portion facing the coil end and the surface of the tip portion facing the coil end into surface contact with the first and second surfaces of the coil end.

12. A method for manufacturing a busbar, which is inserted into the slots of a cylindrical or annular stator core having a plurality of slots arranged in the circumferential direction and connected to the end of a coil formed by winding a rectangular wire around the stator core, comprising: a step of punching out a busbar base from a conductive plate-like member, having a rectangular rod-shaped first portion and a rectangular second portion that extends continuously toward the third direction from a part of the surface on the third direction side which is one side of the longitudinal direction and the thickness direction of the first portion; a step of dividing the second portion of the busbar base into two in the longitudinal direction; a step of bending one and the other of the divided portions of the second portion so as to form a V shape when viewed from the longitudinal direction; and a step of bending the plate surface of the busbar base to bend the busbar base into a shape along the circumferential direction of the stator core.

13. A method for manufacturing a busbar, which is inserted into the slots of a cylindrical or annular stator core having a plurality of slots arranged in the circumferential direction and connected to the end of a coil formed by winding a rectangular wire around the stator core, comprising: a step of punching out a busbar base from a conductive plate-like member, having a rectangular rod-shaped first portion and a rectangular second portion that extends continuously toward the third direction from a part of the surface on the third direction side which is one side of the longitudinal direction and the thickness direction of the first portion, respectively; a step of dividing the second portion of the busbar base into three parts in the longitudinal direction; a step of bending one and the other of two longitudinally adjacent portions of the divided second portion so as to form a V shape when viewed from the longitudinal direction; and a step of bending the plate surface of the busbar base to bend the busbar base into a shape along the circumferential direction of the stator core.

14. A method for manufacturing a busbar which is inserted into the slots of a cylindrical or annular stator core having a plurality of slots arranged in the circumferential direction and connected to the end of a coil formed by winding a flat wire around the stator core, comprising the steps of: punching out a busbar base from a conductive plate-shaped member, having a flat rod-shaped first portion and a stepped second portion which is a step when viewed from the thickness direction, extending continuously toward the third direction from a part of the surface on the third direction side which is one side of the longitudinal direction normal to the longitudinal direction and the thickness direction of the first portion, and having a part of the extended portion in the longitudinal direction which is longer in the third direction than the other part; dividing the second portion into two in the longitudinal direction such that the elongated portion of the second portion and the other portion which is a short portion are separated in the circumferential direction; and bending the elongated portion of the divided second portion to one side in the thickness direction at a length position intermediate to the short portion. A method for manufacturing a busbar, comprising the steps of: bending the tip of the bent portion of the elongated section, which is bent to one side in the thickness direction of the plate, toward the third direction; and bending the plate surface of the busbar base to bend the busbar base into a shape that is aligned with the circumferential direction of the stator core.

15. A method for manufacturing a busbar, which is inserted into the slots of a cylindrical or annular stator core having a plurality of slots arranged in the circumferential direction and connected to the end of a coil formed by winding a rectangular wire around the stator core, comprising: a step of punching out a busbar base from a conductive plate-like member, having a rectangular rod-shaped first portion and a rectangular second portion that extends continuously toward the third direction from a part of the surface on the third direction side which is one of the normal directions to the longitudinal direction and the thickness direction of the first portion, respectively; a step of cutting and bending the second portion of the busbar base so that at least a part of it protrudes toward one of the thickness directions and a hole is formed having an inner circumferential surface that follows the outer shape of the rectangular wire together with the side surface around the protruding portion of the second portion; and a step of bending the plate surface of the busbar base so that the busbar base is bent into a shape that follows the circumferential direction of the stator core.

16. A method for manufacturing a busbar which is inserted into the slots of a cylindrical or annular stator core having a plurality of slots arranged in the circumferential direction and connected to the end of a coil constructed by winding a rectangular wire around the stator core, comprising the steps of: punching out a busbar base from a conductive plate-shaped member, having a first rectangular rod-shaped portion and a second rectangular portion, as viewed from the thickness direction, which extends continuously toward the third direction from a part of the surface on the third direction side which is one side of the longitudinal direction and the thickness direction of the first portion; dividing the second portion of the busbar base into a gate-shaped outer portion and a rectangular inner portion that closes the gate-shaped opening, as viewed from the thickness direction; bending the inner portion to one side in the thickness direction at an intermediate length position of the outer portion; and bending the portion of the inner portion bent to one side in the thickness direction toward the third direction at an intermediate position which is the length of the short side of the cross-section of the end of the coil, A method for manufacturing a busbar, comprising: a step of bending the portion of the inner portion that has been bent toward the third direction toward the other side in the thickness direction of the plate at an intermediate position that is the length of the long side of the cross-section of the end of the coil, so that the tip portion overlaps toward the fourth direction which is the direction opposite to the third direction of the opening; and a step of bending the plate surface of the busbar base body to bend the busbar base body into a shape that is in line with the circumferential direction of the stator core.

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