stata

Abstract

To reduce the possibility of resonance between the neutral wire terminal and the power line terminal. [Solution] The stator comprises an annular stator core having multiple teeth, coils wound around the teeth, a neutral wire busbar positioned at the axial end of the stator core, and a power line busbar positioned at the axial end of the stator core, wherein the tip of the neutral wire terminal is closer to the axial end face of the stator core than the tip of the power line terminal, and the axial length of the neutral wire terminal is different from the axial length of the power line terminal.

Description

Technical Field

[0001] The present invention relates to a stator.

Background Art

[0002] Conventionally, a stator is known in which a coil wound around teeth is welded to a bus bar, the bus bar and a control circuit are electrically connected, and a polyphase AC voltage is applied from the control circuit to the coil to generate a magnetic field in the coil. For example, in Patent Document 1, a configuration is disclosed in which terminals extend radially outward from each of a bus bar main body connected to a neutral line and a bus bar main body connected to a power line at an axial end of a stator. By welding the terminals and the terminals of the coil, a circuit for applying a polyphase AC voltage to the coil is formed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional technology, the neutral line terminals extending from the neutral line bus bar main body and the power line terminals extending from the power line bus bar main body include terminals with similar overall lengths and radial lengths, and there is a possibility of resonance between the neutral line terminals and the power line terminals. When resonance occurs, cracks in the welding are likely to occur.

[0005] The present invention has been made in view of the above problems, and an object thereof is to reduce the possibility of resonance between the neutral line terminals and the power line terminals.

Means for Solving the Problems

[0006] In one embodiment, the stator comprises an annular stator core having a plurality of teeth, a coil wound around the teeth, a neutral wire busbar positioned at the axial end of the stator core, and a power line busbar positioned at the axial end of the stator core, wherein the neutral wire busbar comprises a neutral wire busbar body and a neutral wire terminal extending from the neutral wire busbar body parallel to the axial direction of the stator core, with the axial end of the neutral wire terminal and the end of the terminal extending from the coil parallel to the axial direction of the stator core welded together, and the power line busbar comprises a power line busbar body and a power line terminal extending from the power line busbar body parallel to the axial direction of the stator core. The stator is configured such that the axial end of the power line terminal and the end of a terminal extending parallel to the axial direction of the stator core from the coil are welded together, the power line busbar is a terminal for electrically connecting the coil and the control circuit and includes a second power line terminal extending radially outward from the stator core, the neutral wire terminal is closer to the axial end face of the stator core than the second power line terminal, the neutral wire terminal and the second power line terminal overlap in the circumferential and radial directions, the end of the neutral wire terminal is closer to the axial end face of the stator core than the end of the power line terminal, and the axial length of the neutral wire terminal is different from the axial length of the power line terminal.

[0007] In the above configuration, the neutral wire terminal extends axially parallel to the neutral wire busbar body, and the power line terminal extends axially parallel to the power line busbar body. The axial length of the neutral wire terminal and the axial length of the power line terminal are different. As a result, compared to a configuration in which the neutral wire terminal and the power line terminal are the same length, the possibility of resonance between the neutral wire terminal and the power line terminal can be reduced. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1A is a perspective view of the stator according to this embodiment, and Figure 1B is a circuit diagram of the circuit including the coil. [Figure 2]Figure 2A shows the stator as viewed along the radial direction, and Figure 2B shows the stator as viewed along the axial direction. [Figure 3] This is a perspective view of the neutral line busbar and power line busbar. [Figure 4] Figure 4A is a perspective view of the neutral busbar, and Figure 4B is a schematic diagram showing the neutral busbar body viewed from its circumferential end. [Figure 5] This is a perspective view of a power line busbar. [Figure 6] Figure 6A is a perspective view of a power line busbar for one phase, and Figure 6B is a schematic diagram showing the power line busbar body viewed from its circumferential end. [Figure 7] This is a flowchart showing the manufacturing method of a stator. [Figure 8] Figure 1B is a perspective view of the stator according to this embodiment, and Figure 1B is a circuit diagram of the circuit including the coil. [Figure 9] Figure 9A shows the stator as viewed along the radial direction, and Figure 9B shows the stator as viewed along the axial direction. [Figure 10] This is a perspective view of the neutral line busbar and power line busbar. [Figure 11] Figure 11A is a perspective view of the neutral busbar, and Figure 11B is a schematic diagram showing the neutral busbar body viewed from its circumferential end. [Figure 12] This is a perspective view of a power line busbar. [Figure 13] Figures 13A, 13B, and 13C are perspective views of a single-phase power line busbar. [Figure 14] This diagram schematically shows a power line busbar viewed from its circumferential end. [Modes for carrying out the invention]

[0009] Here, the embodiments will be described in the following order. (1) Stator configuration (2) Manufacturing method (3) Other embodiments, etc.

[0010] (1) Structure of the stator FIG. 1A is a perspective view of the stator 1 according to the present embodiment. FIG. 2A is a view showing the state of the stator 1 viewed along a direction perpendicular to the axial direction, and FIG. 2B is a view showing the state of the stator 1 viewed along the axial direction. The stator 1 includes a stator core 10, a coil 20, a neutral bus bar 30, and a power bus bar 40. In the present embodiment, the stator core 10 forms a ring centered on the axis Ax. That is, the stator core 10 is an annular member sandwiched between the inner peripheral surface on the axis Ax side and the outer peripheral surface far from the axis Ax. In this specification, the direction parallel to the axis Ax is called the axial direction, the direction perpendicular to the axis Ax is called the radial direction, and the rotational direction centered on the axis Ax is called the circumferential direction. Also, in the radial direction, the direction away from the axis Ax is called the outer radial direction, and the direction approaching the axis Ax is called the inner radial direction.

[0011] The stator core 10 is an annular member having a plurality of teeth. Specifically, the stator core 10 includes a plurality of teeth protruding toward the inner circumference of the stator core 10. The plurality of teeth are arranged at equal intervals in the circumferential direction. Slots are formed between adjacent teeth.

[0012] The coil 20 is wound around the teeth. That is, slots are formed between adjacent teeth, and when the coil 20 is wound around the teeth, a part of the coil 20 is accommodated in the slots. Another part protrudes from the end face 10a of the stator core 10 at both ends in the axial direction of the stator core 10. In the coil 20, the portion protruding from the end face 10a of the stator core 10 is called the coil end. In FIGS.1A, 2A, and 2B, mainly the coil ends of the coil 20 are shown. However, the individual windings constituting the coil 20 are omitted, and the coil end portions are shown shaded in gray.

[0013] The neutral bus bar 30 and the power bus bar 40 are arranged axially outside (opposite to the axial center) the coil ends of the coils 20 at the axial ends of the stator core 10. In the present embodiment, it is assumed that the rotating electric machine using the stator 1 is a three-phase AC motor. In this case, the coil 20 becomes one of the U-phase coil, the V-phase coil, and the W-phase coil.

[0014] The coils 20 of each phase are connected, for example, in a Y connection (star connection) shown in FIG. 1B. FIG. 1B shows a configuration of 4 parallel connections for each phase. For example, for the U phase, four columns (coil columns L) of a plurality of coils 20 connected in series are connected in parallel. In each coil column L, the tips of the terminals extending from the adjacent coils 20 are connected to each other. The terminal (power line P shown in FIG. 1B) extending from the coil 20 located at one end of the coil column L is electrically connected to the power bus bar 40. The terminal (neutral line N shown in FIG. 1B) of the coil 20 located at the other end of the coil column L is electrically connected to the neutral bus bar 30.

[0015] FIG. 3 is a perspective view showing the extraction of the neutral bus bar 30 and the power bus bar 40 from FIG. 1A. Further, FIG. 4A is a perspective view showing the extraction of the neutral bus bar 30 from FIG. 3. The neutral bus bar 30 includes a neutral bus bar main body 31 and a neutral bus bar terminal 32 which is a terminal extending parallel to the axial direction of the stator core 10 from the neutral bus bar main body 31.

[0016] The neutral busbar body 31 is a plate-shaped portion whose axial direction is the thickness direction, extending circumferentially while having a constant radial length, and having a predetermined length in the circumferential direction. When viewed from the axial direction, the neutral busbar body 31 is arc-shaped, and its shape is included in the range from the inner diameter to the outer diameter of the ring of the stator core 10 in both the circumferential and radial directions. That is, as shown in Figures 1A and 2B, the neutral busbar body 31 overlaps with the end face 10a of the stator core 10 in both the circumferential and radial directions and does not protrude to the outside. Also, the widest surface of the neutral busbar body 31 is oriented perpendicular to the axial direction. The neutral busbar 30 is positioned at the axial end of the stator core 10 such that the distance between the neutral busbar body 31 and the stator core 10 is constant.

[0017] Figure 4B schematically shows the neutral busbar body 31 as viewed from its circumferential end. However, Figure 4B does not take into account the arc shape of the neutral busbar body 31 in a plane perpendicular to the axial direction. That is, in addition to the neutral terminal 32 shown in Figure 4B, the neutral busbar body 31 and neutral terminal 32 that should be visible at the back of Figure 4B are omitted.

[0018] The neutral wire terminal 32 is a terminal formed by extending radially from the neutral wire busbar body 31, bending at approximately 90 degrees, and extending parallel to the axial direction. In this embodiment, the neutral wire terminal 32 is rectangular in shape. In this embodiment, the neutral wire terminal 32 is provided on both the radially inner and radially outer sides. That is, the neutral wire terminal 32 includes a terminal that extends radially inward from the neutral wire busbar body 31 and further extends parallel to the axial direction, and a terminal that extends radially outward from the neutral wire busbar body 31 and further extends parallel to the axial direction.

[0019] In this embodiment, as shown in Figure 4A, six neutral wire terminals 32 are formed on the radially inward side and six on the radially outward side, for a total of 12 neutral wire terminals 32. With this configuration, compared to a configuration in which neutral wire terminals 32 are formed on only one radial side, it becomes possible to effectively utilize the space at the axial end of the stator core 10.

[0020] In this embodiment, the axial tip 32a of the neutral wire terminal 32 and the tip 21a of the terminal 21 extending parallel to the axial direction of the stator core 10 from the coil 20 are welded together. Figure 4B shows the terminal 21 of the coil 20 and the tip 21a of the terminal 21 that are welded to the tip 32a of the neutral wire terminal 32. Note that the parts of the coil 20, the neutral wire busbar 30, and the power line busbar 40 other than the parts to be welded are covered with an insulator such as resin.

[0021] In this embodiment, the axial position of the tip of all neutral wire terminals 32 is the same. That is, the axial position Pa of the tip 32a of the neutral wire terminal 32 shown in Figure 4B is the same for all neutral wire terminals 32. The terminals 21 of the coil 20 and the neutral wire terminals 32 extend parallel to each other in the axial direction, and the tips of each terminal are in contact at their axial ends. When welding these terminals, the electrode is moved along the axial direction to approach the welding area, and welding is performed.

[0022] Generally, different distances between the workpiece and the electrode can result in different welding conditions (e.g., time, voltage, current, etc.). However, in this embodiment, the axial position Pa is the same for all neutral wire terminals 32. Therefore, it is possible to weld all neutral wire terminals 32 under constant conditions, making welding easier compared to configurations where welding conditions are varied for each neutral wire terminal 32.

[0023] Figure 5 is a perspective view showing the power line busbar 40 extracted from Figure 3. Figure 6A is a perspective view showing the power line busbar 40 for one phase extracted from Figure 5. In this embodiment, one power line busbar 40 is provided for each phase, so there are multiple power line busbars 40. In this embodiment, the shape of the multiple power line busbars 40 is the same. Therefore, there is no need to manufacture power line busbars 40 with different shapes for each phase, which simplifies the manufacturing process and reduces manufacturing costs.

[0024] The power line busbar 40 comprises a power line busbar body 41, a power line terminal 42, and a second power line terminal 43. The power line terminal 42 is a terminal that extends from the power line busbar body 41 parallel to the axial direction of the stator core 10. The second power line terminal 43 is a terminal for electrically connecting the coil 20 and the control circuit (corresponding to terminals Eu, Ew, and Ev shown in Figure 1B), and is a terminal that extends from the power line busbar body 41 radially outward from the stator core.

[0025] The power line busbar body 41 is a plate-shaped portion whose radial direction is the thickness direction, extending circumferentially while having a constant axial length, and having a predetermined length in the circumferential direction. The power line busbar body 41 is bent twice radially in the central part in the circumferential direction, and the portion 41a between the bent portions extends radially, while the other portions 41b and 41c are configured to extend along the circumferential direction.

[0026] The portions 41b and 41c that extend along the circumferential direction are used to arrange two power line busbars 40 in an overlapping manner in the circumferential direction. Specifically, since the power line busbar body 41 has a portion 41a between the bent portions, the positions of portions 41b and 41c are different in the radial direction. Therefore, by arranging a portion 41c of one power line busbar 40 and a portion 41b of another power line busbar 40 with a radial offset, portions 41c and 41b can be arranged to overlap in the circumferential direction. For example, in Figure 5, by arranging a portion 41c of the power line busbar 40 closest to the viewer and a portion 41b of the power line busbar 40 in the center with a radial offset, these portions 41c and 41b overlap in the circumferential direction. With the above configuration, it is possible to make the area where multiple phases of power line busbars 40 exist compact in the circumferential direction.

[0027] When viewed from the axial direction, portions 41b and 41c of the power line busbar body 41 are arc-shaped. Furthermore, the widest surface of the power line busbar body 41 is oriented parallel to the axial direction. As a result, the area in which the power line busbar body 41 exists is almost entirely included in the area in which the neutral line busbar body 31 exists, both in the circumferential and radial directions. That is, as shown in Figures 2B and 3, the power line busbar body 41 is positioned adjacent to the neutral line busbar body 31 in the axial direction, and most of the power line busbar body 41 overlaps with the neutral line busbar body 31 in the circumferential and radial directions. The power line busbar 40 is positioned at the axial end of the stator core 10 such that the distance between the power line busbar body 41 and the neutral line busbar body 31 is constant.

[0028] Figure 6B schematically shows the power line busbar body 41 as viewed from its circumferential end. However, Figure 6B does not take into account the arc shape of the power line busbar body 41 in a plane perpendicular to the axial direction. That is, in addition to the power line terminals 42 shown in Figure 6B, the power line busbar body 41 and power line terminals 42 that should be visible in the background of Figure 6B are omitted.

[0029] The power line terminal 42 is a portion formed by extending radially from the power line busbar body 41, bending at approximately 90 degrees, and extending axially. In this embodiment, the power line terminal 42 is rectangular in shape. In this embodiment, the power line terminal 42 is provided on both the radially inward and radially outward sides. That is, the power line terminal 42 includes a terminal that extends radially inward from the power line busbar body 41 and further extends parallel to the axial direction, and a terminal that extends radially outward from the power line busbar body 41 and further extends parallel to the axial direction.

[0030] In this embodiment, as shown in Figure 6A, two power line terminals 42 are formed on the radially inward side and two on the radially outward side. In this embodiment, since the stator 1 is assumed to be used in a three-phase AC motor, three power line busbars 40 are used. Since each phase's power line busbar body 41 is equipped with four power line terminals 42, there are a total of 12 power line terminals 42 in this embodiment. With this configuration, compared to a configuration in which power line terminals 42 are formed only on one radial side, it becomes possible to effectively utilize the space at the axial end of the stator core 10.

[0031] In this embodiment, the axial tip 42a of the power line terminal 42 and the tip 22a of the terminal 22 extending parallel to the axial direction of the stator core 10 from the coil 20 are welded together. Figure 6B shows the terminal 22 of the coil 20 and the tip 22a of the terminal 22 that are welded to the tip 42a of the power line terminal 42. Note that the parts of the coil 20 and the power line busbar 40 other than the parts to be welded are covered with an insulator such as resin.

[0032] In this embodiment, the axial position of the tip of each power line terminal 42 is the same. That is, the axial position Pb of the tip 42a of each power line terminal 42 shown in Figure 6B is the same for all power line terminals 42. The terminals 22 of the coil 20 and the power line terminals 42 extend parallel to each other in the axial direction, and the tips of each terminal are in contact at their axial ends. When welding these terminals, the electrode is moved along the axial direction to approach the welding area, and welding is performed.

[0033] In this embodiment, the axial position Pb is the same for all power line terminals 42. Therefore, it is possible to weld all power line terminals 42 under constant conditions, making welding easier compared to a configuration in which welding conditions are changed for each power line terminal 42.

[0034] The second power line terminal 43 is a portion that extends axially from the power line busbar body 41, bends approximately 90 degrees, and extends radially outward. In this embodiment, the second power line terminal 43 is plate-shaped. In this embodiment, one second power line terminal 43 is provided that extends radially outward, but none is provided radially inward. In this embodiment, since the stator 1 is assumed to be used for a three-phase AC motor, three power line busbars 40 are used. Since each phase's power line busbar body 41 is equipped with one second power line terminal 43, there are a total of three second power line terminals 43 in this embodiment. That is, there is a terminal for connecting to the control circuit for each of the U, V, and W phases. In this embodiment, the welded portion provided at the tip of the second power line terminal 43 and the wiring extending from the control circuit are welded together. In the second power line terminal 43, the parts other than the welded portion are covered with an insulator such as resin.

[0035] In the circumferential and radial directions, the neutral line busbar body 31 and the power line busbar body 41 overlap. On the other hand, the neutral line busbar body 31 is positioned closer to the stator core 10 than the power line busbar body 41. This configuration allows the power line second terminal 43 and at least one of the neutral line terminals 32 to overlap in the circumferential and radial directions.

[0036] Specifically, the neutral wire busbar body 31 is positioned closer to the axial end face 10a of the stator core 10 than the power line busbar body 41. Furthermore, in the axial direction, the tip of the neutral wire terminal 32 is closer to the axial end face 10a of the stator core 10 than the power line second terminal 43.

[0037] In Figure 2A, the axial position Pa of the tip of the neutral wire terminal 32 and the position Pc of the end of the power line second terminal 43 on the end face 10a side in the axial direction are shown by dashed lines. Thus, in this embodiment, the neutral wire terminal 32 and the power line second terminal 43 do not interfere with each other in the axial direction. For this reason, the neutral wire busbar 30 and the power line busbar 40 can be arranged so that the neutral wire terminal 32 and the power line second terminal 43 overlap in the circumferential and radial directions.

[0038] This arrangement is achieved by welding the neutral wire terminal 32 to the coil 20 before welding the power line terminal 42 to the coil 20. In other words, in this embodiment, the neutral wire busbar 30 is positioned at the axial end of the stator core 10, but the tip 32a of the neutral wire terminal 32 of the neutral wire busbar 30 and the tip 21a of the terminal 21 are welded together before the power line busbar 40 is positioned. Since the power line busbar 40 is not positioned at this welding stage, welding can be performed without the need for complicated work such as moving the electrodes to avoid the power line busbar 40.

[0039] After the tip 32a of the neutral wire terminal 32 and the tip 21a of the terminal 21 are welded together, the power line busbar 40 is positioned adjacent to the neutral wire busbar body 31, and the tip 42a of the power line terminal 42 of the power line busbar 40 and the tip 22a of the terminal 22 are welded together. At this welding stage, since the welding of the neutral wire terminal 32 is already completed, it is possible to have at least a portion of the neutral wire terminal 32 and the second power line terminal 43 overlap in the circumferential and radial directions. With this configuration, compared to a configuration in which the neutral wire terminal 32 and the second power line terminal 43 do not overlap in the circumferential and radial directions, it becomes possible to effectively utilize the space at the axial end of the stator core 10.

[0040] Furthermore, in this embodiment, the tip 32a of the neutral wire terminal 32 is closer to the axial end face 10a of the stator core 10 than the tip 42a of the power wire terminal 42. Therefore, when welding the tip 42a of the power wire terminal 42, it becomes unnecessary to avoid the tip 32a of the neutral wire terminal 32 and bring the electrode closer to the tip 42a of the power wire terminal 42, making welding easier.

[0041] Furthermore, in this embodiment, the axial length of the neutral wire terminal 32 (L1 shown in Figure 4B) and the axial length of the power line terminal 42 (L2 shown in Figures 2A and 6B) are different. Specifically, in this embodiment, the axial length of the neutral wire terminal 32 is longer than the axial length of the power line terminal 42. Therefore, when the stator 1 is used in a rotating electric machine and vibration occurs due to rotation, the possibility of resonance between the neutral wire terminal 32 and the power line terminal 42 is low. This reduces the possibility of cracks, damage, etc., occurring at welding points, etc.

[0042] Furthermore, in this embodiment, the terminals of the coil 20 are welded to the tip 32a of the neutral wire terminal 32 and the tip 42a of the power line terminal 42, but the axial positions Pa and Pb of these tips 32a and 42a are different. Generally, the potential difference between the potential of the neutral wire terminal 32 and the potential of the power line terminal 42 can be large, but in this embodiment, because the positions Pa and Pb of the tip 32a of the neutral wire terminal 32 and the tip 42a of the power line terminal 42 are different, the distance between them can be ensured, and the possibility of ensuring insulation can be increased.

[0043] (2) Manufacturing method: Next, the manufacturing method of the stator 1 will be described. Figure 7 is a flowchart of the manufacturing method of the stator 1. When the manufacturing of the stator 1 is started, the stator core 10 is manufactured first (step S100). Here, a stator core 10 with a shape and size according to a predetermined design is manufactured. The stator core 10 may be in various forms, but here, the stator core 10 is constructed by laminating electrical steel sheets. Therefore, in step S100, multiple electrical steel sheets of a predetermined shape and size are manufactured, and the stator core is manufactured by laminating these sheets.

[0044] Next, the coil 20 is wound (step S105). That is, multiple teeth are formed on the radially inner surface of the stator core 10 manufactured in step S100, and slots are formed between the multiple teeth. The pre-prepared coil 20 is then wound around the teeth using a known winding device or the like, according to a predetermined winding method.

[0045] Next, the neutral wire busbar 30 and the power wire busbar 40 are manufactured (step S110). Specifically, the metal constituting the neutral wire busbar 30 and the power wire busbar 40 is cut to a predetermined size and shape. In the neutral wire busbar 30, the 12 neutral wire terminals 32 extending from the neutral wire busbar body 31 are bent to the shape shown in Figure 4A. In addition, a total of three power wire busbars 40 are manufactured, and the 4 power wire terminals 42 extending from the power wire busbar body 41 of each power wire busbar 40 are bent to the shape shown in Figure 6A. Furthermore, in the neutral wire busbar 30 and the power wire busbar 40, the parts other than the welded parts are covered with resin or the like to provide insulation. Note that step S110 may be performed before step S100.

[0046] Next, the neutral wire busbar 30 is positioned in a predetermined location (step S115). Specifically, in step S105, when the coil 20 is wound around the stator core 10, the orientation and position of the terminals 21 and 22 of the coil 20 are adjusted so that there is space at the axial end of the stator core 10 to position the neutral wire busbar 30 and the power line busbar 40. Thus, the neutral wire busbar 30 is positioned in a predetermined location. As a result, the tip 32a of the neutral wire terminal 32 and the tip 21a of the terminal 21 of the coil 20 face each other and are in contact. When positioning the neutral wire busbar 30 in a predetermined location, a jig or the like may be used to position the neutral wire busbar 30.

[0047] Next, the welding conditions are set to those for the neutral wire terminal 32 (step S120). That is, the tip 32a of the neutral wire terminal 32 and the tip 21a of the terminal 21 of the coil 20 are located at the same position in the axial direction. In a welding apparatus that brings electrodes closer together along the axial direction, multiple welding points that are at the same axial position and have the same material and size to be welded can be welded under the same welding conditions. In this embodiment, the welding conditions for the neutral wire terminal 32 are predetermined, and in step S120, these welding conditions are set for the welding apparatus.

[0048] Next, the neutral wire terminal 32 and the terminal 21 of the coil 20 are welded together (step S125). That is, according to the welding conditions set in step S120, the welding apparatus welds the tip 32a and the tip 21a of each of the multiple neutral wire terminals 32 together.

[0049] Next, the power line busbars 40 are positioned at predetermined locations adjacent to the neutral line busbar body 31 (step S130). Specifically, the predetermined location for positioning the power line busbars 40 is the position adjacent to the opposite side of the end face 10a of the stator core 10 in the axial direction when viewed from the neutral line busbar body 31. Three power line busbars 40 are then positioned at these predetermined locations. In this case, a portion 41c of one power line busbar 40 and a portion 41b of another power line busbar 40 are positioned with a radial offset, and these portions 41c and 41b overlap in the circumferential direction. As a result, the tip 42a of the power line terminal 42 and the tip 22a of the terminal 22 of the coil 20 face each other and are in contact. When positioning the power line busbars 40 at the predetermined locations, jigs or the like may be used to position the power line busbars 40.

[0050] Next, the welding conditions are set to those for the power line terminal 42 (step S135). That is, the tip 42a of the power line terminal 42 and the tip 22a of the terminal 22 of the coil 20 are located at the same position in the axial direction. In a welding apparatus that brings electrodes closer together along the axial direction, multiple welding points that are at the same axial position and have the same material and size to be welded can be welded under the same welding conditions. In this embodiment, the welding conditions for the power line terminal 42 are predetermined, and in step S135, these welding conditions are set for the welding apparatus.

[0051] Next, the power line terminal 42 and the terminal 22 of the coil 20 are welded together (step S140). That is, according to the welding conditions set in step S135, the welding apparatus welds the tip 42a and the tip 22a of each of the multiple power line terminals 42. As described above, with this manufacturing method in which welding of the neutral wire busbar 30 is performed first and welding of the power line busbar 40 is performed later, it is possible to provide a stator 1 in which the neutral wire terminal 32 and the second power line terminal 43 overlap in the circumferential and radial directions. Therefore, it becomes possible to effectively utilize the space at the axial end of the stator core 10.

[0052] (3) Other embodiments, etc. The embodiments described above are merely examples for carrying out the present invention, and various other embodiments can be adopted. For example, a rotating electric machine utilizing the stator 1 may be applied to various devices. Furthermore, the shape, number, size, etc., of the neutral line busbar 30 and power line busbar 40 are not limited to the configuration in the embodiments described above, and may be in various forms.

[0053] The stator core is an annular component and may have multiple teeth. The teeth can be any part around which the coil is wound, and their number, size, etc., are not limited. Although the stator core is annular, the shape of the ring, such as the outer circumference or inner circumference, is not limited.

[0054] A coil can be formed by winding wire around teeth, and the winding wire can be either square or round; the shape of the wire itself is not limited. Furthermore, the number of windings and the winding method are not limited.

[0055] A neutral busbar is a component in a multiphase AC circuit that serves as the neutral point of a coil, and is electrically connected to the winding of the coil that serves as the neutral point. The neutral busbar only needs to be electrically connected to the neutral point; its shape, size, and number are not limited. Furthermore, a neutral busbar only needs to consist of a neutral busbar body and a neutral terminal; other parts may be present.

[0056] The neutral busbar body is the starting point from which the neutral terminal extends, and is longer than the neutral terminal in at least one direction. In the above embodiment, the neutral busbar body is longer than the neutral terminal in the circumferential direction. The shape of the neutral busbar body is not limited, but in order to not reduce the efficiency of space utilization when it is placed at the end of the stator, it is preferable that it be a plate-shaped or linear member. It is also preferable that it be shaped to conform to the shape of the end face of the stator. For example, if the end face of the stator is annular, the circumferential shape of the neutral busbar body is preferably shaped to conform to the circumferential shape of the annular end face.

[0057] The neutral wire terminals can be any terminals that extend from the neutral wire busbar body parallel to the axial direction of the stator core. That is, each of the multiple neutral wire terminals extending from the neutral wire busbar body extends away from the end face of the stator in the axial direction, and it is sufficient if the welding axis can be moved in the direction along the axial direction to approach the tip of the neutral wire terminal.

[0058] Welding is performed at the axial end of the neutral wire terminal and the end of the terminal extending parallel to the axial direction from the coil to the stator core. In other words, the ends of the neutral wire terminal and the ends of the coil windings are free from resin or other coatings and are in a state where welding is possible. The parts that are not welded are covered with resin or other coatings and insulated.

[0059] A power line busbar is a component in a multiphase AC circuit to which the potential of each phase of a coil is applied. A power line busbar can be any component that is electrically connected to the part that becomes the potential of each phase, and its shape, size, and number are not limited. Furthermore, a power line busbar only needs to consist of a power line busbar body, power line terminals, and a second power line terminal, and other parts may be present.

[0060] The power line busbar body is the starting point from which the power line terminals extend, and is longer than the power line terminals in at least one direction. In the above embodiment, the power line busbar body is longer than the neutral wire terminal in the circumferential direction. The shape of the power line busbar body is not limited, but in order to not reduce the efficiency of space utilization when it is placed at the end of the stator, it is preferable that it be a plate-shaped or linear member. It is also preferable that it be shaped to conform to the shape of the end face of the stator. For example, if the end face of the stator is annular, it is preferable that the circumferential shape of the power line busbar body conforms to the circumferential shape of the annular end face.

[0061] The power line terminals can be terminals that extend from the power line busbar body parallel to the axial direction of the stator core. That is, each of the multiple power line terminals extending from the power line busbar body extends in a direction away from the end face of the stator in the axial direction, and it is sufficient if the welding axis can be moved in a direction along the axial direction to approach the tip of the power line terminal.

[0062] Welding is performed at the axial end of the power line terminal and the end of the terminal extending parallel to the axial direction from the coil to the stator core. In other words, the end of the neutral wire terminal and the end of the coil winding are not covered with resin or other coatings and are in a state where welding is possible. The parts that are not welded are covered with resin or other coatings and insulated.

[0063] The second power line terminal is a terminal for electrically connecting the coil and the control circuit, and it does not need to be a terminal that extends radially outward from the power line busbar body to the stator core. In other words, the power line busbar is electrically connected to the control circuit via the second power line terminal. The shape, size, and number of the second power line terminals are not limited, but it is sufficient that at least one is provided on each phase power line busbar.

[0064] The neutral wire terminal is closer to the axial end face of the stator core than the second power line terminal, and the neutral wire terminal and the second power line terminal only need to overlap in the circumferential and radial directions. That is, when viewing the end face of the stator from a position away from the stator along the axial direction, the neutral wire terminal and the second power line terminal should overlap, with the second power line terminal in front and the neutral wire terminal in the back. With this configuration, it is possible to place the neutral wire terminal in the part hidden by the second power line terminal, and the space on the end face of the stator can be used effectively.

[0065] The tip of the neutral wire terminal is closer to the axial end face of the stator core than the tip of the power line terminal, and the axial length of the neutral wire terminal and the axial length of the power line terminal are different. In other words, the tip of the neutral wire terminal is closer to the axial end face of the stator core than the tip of the power line terminal, so that the neutral wire terminal can be welded first and the power line terminal can be welded later. If the welding conditions are different, the axial position of the tip of the neutral wire terminal may be different, and the axial position of the tip of the power line terminal may also be different.

[0066] Furthermore, it is sufficient that the axial lengths of the neutral wire terminal and the power line terminal are different, and as a result, they are configured so that they do not resonate with each other. In other words, it is sufficient that the lengths of the neutral wire terminal and the power line terminal are different, at least in the axial direction, so that the resonant frequencies of the neutral wire terminal and the power line terminal are different. Of course, the total length of the neutral wire terminal 32 and the total length of the power line terminal 42 may be different.

[0067] The above-described embodiment is just one example, and various other embodiments may be adopted. For example, the shapes of the multiple power line busbars may differ from each other. Figure 8 is a perspective view of the stator 101 according to this embodiment. Figure 9A shows the stator 101 as viewed along a direction perpendicular to the axial direction, and Figure 9B shows the stator 101 as viewed along the axial direction. The stator 101 comprises a stator core 100, a coil 200, a neutral line busbar 300, and a power line busbar 400. The power line busbar 400 includes a power line busbar 400u for the U phase, a power line busbar 400v for the V phase, and a power line busbar 400w for the W phase. When these busbars are not distinguished, they are referred to as power line busbar 400.

[0068] In this embodiment, the stator core 100 forms a ring centered on axis Ax. That is, the stator core 100 is an annular member sandwiched between an inner circumferential surface on the axis Ax side and an outer circumferential surface farther from axis Ax. Here again, the direction parallel to axis Ax is called the axial direction, the direction perpendicular to axis Ax is called the radial direction, and the rotational direction around axis Ax is called the circumferential direction. Furthermore, in the radial direction, the direction away from axis Ax is called the radially outward direction, and the direction approaching axis Ax is called the radially inward direction.

[0069] The stator core 100 is an annular member having multiple teeth. Specifically, the stator core 100 has multiple teeth that protrude toward the inner circumference of the stator core 100. The multiple teeth are arranged at equal intervals in the circumferential direction. Slots are formed between adjacent teeth.

[0070] The coil 200 is wound around the teeth. That is, slots are formed between adjacent teeth, and when the coil 200 is wound around the teeth, a portion of the coil 200 is housed in these slots. The other portion protrudes from the end faces 100a of the stator core 100 at both axial ends of the stator core 100. The portion of the coil 200 that protrudes from the end faces 100a of the stator core 100 is called the coil end. Figures 8, 9A, and 9B mainly show the coil ends of the coil 200. However, the individual windings that make up the coil 200 are omitted, and the coil end portion is shown in gray.

[0071] The neutral line busbar 300 and the power line busbar 400 are positioned at the axial end of the stator core 100, further outward in the axial direction (opposite the axial center) than the coil ends of the coils 200. In this embodiment, it is assumed that the rotating electric machine using the stator 101 is a three-phase AC motor, in which case the coils 200 will be either U-phase coils, V-phase coils, or W-phase coils.

[0072] The coils 200 for each phase are connected, for example, in a Y-connection (star connection) as shown in Figure 1B. Figure 1B shows a configuration of four parallel connections for each phase. For example, for the U phase, four sets of series-connected coils 200 (coil rows L) are connected in parallel. In each set of coil rows L, the ends of the terminals extending from adjacent coils 200 are connected to each other. The terminals extending from the coil 200 located at one end of the coil row L (power lines P shown in Figure 1B) are electrically connected to the power line busbar 400. That is, the power lines P for the U phase are electrically connected to the power line busbar 400u, the power lines P for the V phase are electrically connected to the power line busbar 400v, and the power lines P for the W phase are electrically connected to the power line busbar 400w. The terminals of the coil 200 located at the other end of the coil row L (neutral lines N shown in Figure 1B) are electrically connected to the neutral line busbar 300.

[0073] Figure 10 is a perspective view showing the neutral busbar 300 and power busbar 400 extracted from Figure 8. Figure 11A is a perspective view showing the neutral busbar 300 extracted from Figure 10. The neutral busbar 300 comprises a neutral busbar body 310 and a neutral terminal 320 which is a terminal extending from the neutral busbar body 310 parallel to the axial direction of the stator core 100.

[0074] The neutral busbar body 310 is a plate-shaped portion whose axial direction is the thickness direction, extending circumferentially while having a constant radial length, and having a predetermined length in the circumferential direction. When viewed from the axial direction, the neutral busbar body 310 is arc-shaped, and its shape is included in the range from the inner diameter to the outer diameter of the ring of the stator core 100 in both the circumferential and radial directions. That is, as shown in Figures 8 and 9B, the neutral busbar body 310 overlaps with the end face 100a of the stator core 100 in both the circumferential and radial directions and does not protrude to the outside. Also, the widest surface of the neutral busbar body 310 is oriented perpendicular to the axial direction. The neutral busbar 300 is positioned at the axial end of the stator core 100 such that the distance between the neutral busbar body 310 and the stator core 100 is constant.

[0075] Figure 11B schematically shows the neutral busbar body 310 as viewed from its circumferential end. However, Figure 11B does not take into account the arc shape of the neutral busbar body 310 in a plane perpendicular to the axial direction. That is, in addition to the neutral terminal 320 shown in Figure 11B, the neutral busbar body 310 and the neutral terminal 320 that should be visible at the back of Figure 11B are omitted.

[0076] The neutral wire terminal 320 extends radially from the neutral wire busbar body 310, then bends approximately 90 degrees and extends parallel to the axial direction. The neutral wire terminal 320 only needs to extend axially and may be bent in part. In the example shown in Figures 11A and 11B, the radially inner neutral wire terminal 320 extends axially in a portion of its axial direction, moving away from the neutral wire busbar body 310 radially outward.

[0077] In this embodiment, the neutral wire terminal 320 is rectangular, but the portion adjacent to the neutral wire busbar body 310 is thicker than other portions. Also, in this embodiment, the neutral wire terminal 320 is provided on both the radially inward and radially outward sides. That is, the neutral wire terminal 320 includes a terminal located radially inward when viewed from the neutral wire busbar body 310, and a terminal located radially outward when viewed from the neutral wire busbar body 310.

[0078] In this embodiment, as shown in Figure 11A, six neutral wire terminals 320 are formed on the radially inward side and six on the radially outward side, for a total of 12 neutral wire terminals 320. With this configuration, compared to a configuration in which neutral wire terminals 320 are formed on only one radial side, it becomes possible to effectively utilize the space at the axial end of the stator core 100.

[0079] In this embodiment, the axial tip 320a of the neutral wire terminal 320 and the tip 210a of the terminal 210 extending parallel to the axial direction of the stator core 100 from the coil 200 are welded together. Figure 11B shows the terminal 210 of the coil 200 and the tip 210a of the terminal 210 that are welded to the tip 320a of the neutral wire terminal 320. Note that the parts of the coil 200, neutral wire busbar 300, and power line busbar 400 other than the parts to be welded are covered with an insulator such as resin.

[0080] In this embodiment, the axial position of the tip of all neutral wire terminals 320 is the same. That is, the axial position Pa of the tip 320a of the neutral wire terminal 320 shown in Figure 11B is the same for all neutral wire terminals 320. The terminals 210 of the coil 200 and the neutral wire terminals 320 extend parallel to each other in the axial direction, and the tips of each terminal are in contact at their axial ends. When welding these terminals, the electrode is moved along the axial direction to approach the welding area, and welding is performed.

[0081] Generally, different distances between the workpiece and the electrode can result in different welding conditions (e.g., time, voltage, current, etc.). However, in this embodiment, the axial position Pa is the same for all neutral wire terminals 320. Therefore, it is possible to weld all neutral wire terminals 320 under constant conditions, making welding easier compared to configurations where welding conditions are varied for each neutral wire terminal 320.

[0082] Figure 12 is a perspective view showing the power line busbar 400 extracted from Figure 10. Figure 13A is a perspective view of the U-phase power line busbar 400u, Figure 13B is a perspective view of the V-phase power line busbar 400v, and Figure 13C is a perspective view of the W-phase power line busbar 400w. In this embodiment, since one power line busbar 400 is provided for each phase, there are multiple power line busbars 400. In this embodiment, the shapes of the multiple power line busbars 400 are partially identical and partially different.

[0083] The power line busbar 400 (400u, 400v, 400w) comprises a power line busbar body 410, a power line terminal 420, and a second power line terminal 430. The power line terminal 420 is a terminal that extends from the power line busbar body 410 parallel to the axial direction of the stator core 100. The second power line terminal 430 is a terminal for electrically connecting the coil 200 and the control circuit (corresponding to terminals Eu, Ew, Ev shown in Figure 1B), and is a terminal that extends from the power line busbar body 410 radially outward from the stator core. In this embodiment, the power line busbar body 410 and the power line terminal 420 are identical in shape for all U-phase power line busbars 400u, V-phase power line busbars 400v, and W-phase power line busbars 400w. On the other hand, the second power line terminal 430 has a different shape for each of the U-phase power line busbar 400u, V-phase power line busbar 400v, and W-phase power line busbar 400w. With this configuration, by providing the second power line terminal with a different shape to a material having a common body and power line terminal, the second power line terminal 430 can be manufactured for the U-phase power line busbar 400u, the V-phase power line busbar 400v, and the W-phase power line busbar 400w. Therefore, the power line busbar 400 can be easily manufactured.

[0084] The power line busbar body 410 is a plate-shaped portion whose axial direction is the thickness direction and has a predetermined length in the circumferential direction. In the power line busbar body 410, the radial length differs between the ends and the center in the circumferential direction. The power line busbar body 410 has a portion 410a in the central part in the circumferential direction which has the longest radial length, and portions 410b and 410c with relatively smaller radial lengths are located at both ends of this portion in the circumferential direction. One portion 410b is formed radially inward, and the other portion 410c is formed radially outward.

[0085] The portions 410b and 410c located at both ends in the circumferential direction are used to arrange two power line busbars 400 side by side in the circumferential direction. Specifically, when two of the U-phase power line busbars 400u, V-phase power line busbars 400v, and W-phase power line busbars 400w are selected and arranged side by side in the circumferential direction, one portion 410b and the other portion 410c will be adjacent. Since the radial positions of one portion 410b and the other portion 410c are different, the power line busbars 400 can be arranged in the circumferential direction in a state where they overlap in the circumferential direction without interfering with each other, as shown in Figure 12. As a result, the U-phase power line busbars 400u, V-phase power line busbars 400v, and W-phase power line busbars 400w can be compactly arranged in the circumferential direction so that they exist on the circumference.

[0086] The power line busbar body 410 is arc-shaped when viewed from the axial direction. Furthermore, the widest surface of the power line busbar body 410 is oriented perpendicular to the axial direction. In this embodiment, the area in which the power line busbar body 410 exists is the same as the area in which the neutral line busbar body 310 exists in the circumferential and radial directions. That is, as shown in Figures 9B and 10, the power line busbar body 410 is positioned adjacent to the neutral line busbar body 310 in the axial direction, and most of the power line busbar body 410 overlaps with the neutral line busbar body 310 in the circumferential and radial directions. The power line busbar 400 is positioned at the axial end of the stator core 100 such that the distance between the power line busbar body 410 and the neutral line busbar body 310 is constant.

[0087] Figure 14 schematically shows the power line busbar body 410 of the U-phase power line busbar 400u as viewed from its circumferential end. However, Figure 14 does not take into account the arc shape of the power line busbar body 410 in a plane perpendicular to the axial direction. That is, in addition to the power line terminals 420 shown in Figure 14, the power line busbar body 410 and power line terminals 420 that should be visible in the background of Figure 14 are omitted.

[0088] The power line terminal 420 is a portion formed by extending radially from the power line busbar body 410, bending at approximately 90 degrees, and extending axially. In this embodiment, the power line terminal 420 is rectangular in shape. In this embodiment, the power line terminal 420 is provided on both the radially inward and radially outward sides. That is, the power line terminal 420 includes a terminal that extends radially inward from the power line busbar body 410 and further extends parallel to the axial direction, and a terminal that extends radially outward from the power line busbar body 410 and further extends parallel to the axial direction.

[0089] In this embodiment, as shown in Figure 13A, two power line terminals 420 are formed on the radially inward side and two on the radially outward side. In this embodiment, since the stator 101 is assumed to be used in a three-phase AC motor, three power line busbars 400 are used (U-phase power line busbar 400u, V-phase power line busbar 400v, and W-phase power line busbar 400w). Since each phase's power line busbar body 410 is equipped with four power line terminals 420, there are a total of 12 power line terminals 420 in this embodiment. With this configuration, compared to a configuration in which power line terminals 420 are formed only on one radial side, it becomes possible to effectively utilize the space at the axial end of the stator core 100.

[0090] In this embodiment, the axial tip 420a of the power line terminal 420 and the tip 220a of the terminal 220 extending parallel to the axial direction of the stator core 100 from the coil 200 are welded together. Figure 14 shows the terminal 220 of the coil 200 and the tip 220a of the terminal 220 that are welded to the tip 420a of the power line terminal 420. Note that the parts of the coil 200, the neutral wire busbar 300, and the power line busbar 400 other than the parts to be welded are covered with an insulator such as resin.

[0091] In this embodiment, the axial position of the tip of all power line terminals 420 is the same. That is, the axial position Pb of the tip 420a of the power line terminal 420 shown in Figure 14 is the same for all power line terminals 420. The terminals 220 of the coil 200 and the power line terminals 420 extend parallel to each other in the axial direction, and the tips of each terminal are in contact at their axial ends. When welding these terminals, the electrode is moved along the axial direction to approach the welding area, and welding is performed.

[0092] In this embodiment, the axial position Pb is the same for all power line terminals 420. Therefore, it is possible to weld all power line terminals 420 under constant conditions, making welding easier compared to a configuration in which welding conditions are changed for each power line terminal 420.

[0093] The second power line terminal 430 is a portion that extends axially from the power line busbar body 410, bends approximately 90 degrees, and extends radially outward. In this embodiment, the second power line terminal 430 is plate-shaped. Furthermore, the axial thickness of the radially outward tip portion of the second power line terminal 430 is thinner than that of the radially inward portion.

[0094] The shape of the second power line terminal 430 differs for the U-phase power line busbar 400u, the V-phase power line busbar 400v, and the W-phase power line busbar 400w. Specifically, as shown in Figures 13A, 13B, and 13C, the second power line terminal 430 is a plate-like portion that extends radially outward, but its shape differs when viewed from a direction parallel to the axial direction. In other words, the direction in which the second power line terminal 430 extends differs for each.

[0095] In this embodiment, a hole 430a is formed at the tip of each second power line terminal 430 for welding wiring extending from the control circuit. That is, in this embodiment, the welding portion including the hole 430a provided at the tip of the second power line terminal 430 and the wiring extending from the control circuit are welded together. As shown in Figure 12, each hole 430a is aligned in a straight line in a plane perpendicular to the axial direction. By aligning the holes 430a in this way, the wiring extending from the control circuit can be made in a simple configuration. In addition, even in the second power line terminal 430, the parts other than the parts to be welded are covered with an insulator such as resin.

[0096] In the circumferential and radial directions, the neutral line busbar body 310 and the power line busbar body 410 overlap. On the other hand, the neutral line busbar body 310 is positioned closer to the stator core 100 than the power line busbar body 410. This configuration allows the power line second terminal 430 and at least one of the neutral line terminals 320 to overlap in the circumferential and radial directions.

[0097] Specifically, the neutral wire busbar body 310 is positioned closer to the axial end face 100a of the stator core 100 than the power line busbar body 410. Furthermore, in the axial direction, the tip of the neutral wire terminal 320 is closer to the axial end face 100a of the stator core 100 than the power line second terminal 430.

[0098] In Figure 9A, the axial position Pa of the tip 320a of the neutral wire terminal 320 and the position Pc of the end of the power line second terminal 430 on the end face 100a side in the axial direction are shown by dashed lines. Thus, in this embodiment, the neutral wire terminal 320 and the power line second terminal 430 do not interfere with each other in the axial direction. For this reason, the neutral wire busbar 300 and the power line busbar 400 can be arranged so that the neutral wire terminal 320 and the power line second terminal 430 overlap in the circumferential and radial directions.

[0099] This arrangement is achieved by welding the neutral wire terminal 320 to the coil 200 before welding the power line terminal 420 to the coil 200. In other words, in this embodiment, the neutral wire busbar 300 is positioned at the axial end of the stator core 100, but the tip 320a of the neutral wire terminal 320 of the neutral wire busbar 300 and the tip 210a of the terminal 210 are welded together while the power line busbar 400 is not positioned. Since the power line busbar 400 is not positioned at this welding stage, welding can be performed without the need for complicated work such as moving the electrodes to avoid the power line busbar 400.

[0100] After the tip 320a of the neutral wire terminal 320 and the tip 210a of the terminal 210 are welded together, the power line busbar 400 is positioned adjacent to the neutral wire busbar body 310, and the tip 420a of the power line terminal 420 of the power line busbar 400 and the tip 220a of the terminal 220 are welded together. At this welding stage, since the welding of the neutral wire terminal 320 is already completed, at least some of the neutral wire terminal 320 and the second power line terminal 430 can overlap in the circumferential and radial directions. With this configuration, compared to a configuration in which the neutral wire terminal 320 and the second power line terminal 430 do not overlap in the circumferential and radial directions, it becomes possible to effectively utilize the space at the axial end of the stator core 100.

[0101] Furthermore, in this embodiment, the tip 320a of the neutral wire terminal 320 is closer to the axial end face 100a of the stator core 100 than the tip 420a of the power wire terminal 420 (see Figure 9A). Therefore, when welding the tip 420a of the power wire terminal 420, it becomes unnecessary to avoid the tip 320a of the neutral wire terminal 320 and bring the electrode closer to the tip 420a of the power wire terminal 420, making welding easier.

[0102] Furthermore, in this embodiment, the axial length of the neutral wire terminal 320 (L1 shown in Figure 11B) and the axial length of the power line terminal 420 (L2 shown in Figure 14) are different. Specifically, in this embodiment, the axial length of the neutral wire terminal 320 is longer than the axial length of the power line terminal 420. Therefore, when the stator 101 is used in a rotating electric machine and vibration occurs due to rotation, the possibility of resonance between the neutral wire terminal 320 and the power line terminal 420 is low. This reduces the possibility of cracks, damage, etc., occurring at welding points, etc.

[0103] Furthermore, in this embodiment, the terminals of the coil 200 are welded to the tip 320a of the neutral wire terminal 320 and the tip 420a of the power line terminal 420, but the axial positions Pa and Pb of these tips 320a and 420a are different. Generally, the potential difference between the potential of the neutral wire terminal 320 and the potential of the power line terminal 420 can be large, but in this embodiment, because the positions Pa and Pb of the tip 320a of the neutral wire terminal 320 and the tip 420a of the power line terminal 420 are different, the distance between them can be ensured, and the possibility of ensuring insulation can be increased. The manufacturing method of the stator 101 according to this embodiment is the same as the manufacturing method shown in Figure 7. Of course, parts that differ between the first embodiment and this embodiment, such as the orientation in which the power line busbars 400 are arranged, may be adjusted as appropriate.

[0104] If at least a portion of the shape is the same for each of the multiple power line busbars, the manufacturing process for the parts with the same shape can be made common, thereby simplifying the manufacturing process for the multiple power line busbars. As in the first embodiment, if the shape is the same for all parts of the multiple power line busbars 40, the manufacturing process can be made very simple. As in the second embodiment, even if the shape of the power line busbar body and power line terminals of the multiple power line busbars 400 is the same, the manufacturing process can be simplified. That is, even if the shapes of the parts other than the second power line terminals among the parts constituting the multiple power line busbars 400 are the same, the manufacturing process can be made very simple. Furthermore, in this configuration, by making the shapes of the second power line terminals of the multiple power line busbars 400 different from each other, it becomes possible to make the shape such that the wiring extending from the control circuit can be easily connected to the second power line terminals, making the wiring easier to manage. Note that the parts that have the same shape for each of the multiple power line busbars are not limited to the body and power line terminals; the shape may be the same for only the body or only the power line terminals, or the shape may be the same for other parts as well. [Explanation of symbols]

[0105] 1... Stator, 10... Stator core, 10a... End face, 20... Coil, 21... Terminal, 21a... Tip, 22... Terminal, 22a... Tip, 30... Neutral wire busbar, 31... Neutral wire busbar body, 32... Neutral wire terminal, 32a... Tip, 40... Power line busbar, 41... Power line busbar body, 41a... Part, 41b... Part, 41c... Part, 42... Power line terminal, 42a... Tip, 43... Power line second terminal, 100... Stator core, 100a... End face, 101... Stator, 200... Co Il, 210... Terminal, 210a... Tip, 220... Terminal, 220a... Tip, 300... Neutral wire busbar, 310... Neutral wire busbar body, 320... Neutral wire terminal, 320a... Tip, 400... Power line busbar, 400u... Power line busbar, 400v... Power line busbar, 400w... Power line busbar, 410... Power line busbar body, 410a... Part, 410b... Part, 410c... Part, 420... Power line terminal, 420a... Tip, 430... Power line second terminal, 430a... Hole

Claims

1. An annular stator core having multiple teeth, The coil wound around the aforementioned teeth, A neutral busbar is positioned at the axial end of the stator core, The stator core comprises a power line busbar positioned at the axial end, The aforementioned neutral busbar is, The neutral busbar body, The neutral wire busbar body is provided with a neutral wire terminal that extends parallel to the axial direction of the stator core, The axial end of the neutral wire terminal and the end of the terminal extending parallel to the axial direction of the stator core from the coil are welded together. The aforementioned power line busbar is Power line busbar body, The power line busbar body is provided with power line terminals which are terminals that extend parallel to the axial direction of the stator core, The axial end of the power line terminal and the end of the terminal extending from the coil parallel to the axial direction of the stator core are welded together. The power line busbar is a terminal for electrically connecting the coil and the control circuit, and includes a second power line terminal extending radially outward from the power line busbar body toward the stator core. The neutral wire terminal is closer to the axial end face of the stator core than the second power wire terminal. The neutral wire terminal and the second power wire terminal overlap in the circumferential and radial directions. The tip of the neutral wire terminal is closer to the axial end face of the stator core than the tip of the power line terminal, and the axial length of the neutral wire terminal is different from the axial length of the power line terminal. stata.

2. The neutral wire terminal is, A terminal extending radially inward from the neutral wire busbar body and further extending parallel to the axial direction, A terminal extending radially outward from the neutral wire busbar body and further extending parallel to the axial direction, Includes, The aforementioned power line terminals are A terminal extending radially inward from the power line busbar body and further extending parallel to the axial direction, A terminal extending radially outward from the power line busbar body and further extending parallel to the axial direction, including, The stator according to claim 1.

3. There are multiple neutral wire terminals, and the axial position of the tips of the multiple neutral wire terminals is the same. Multiple power line terminals exist, and the axial position of the tips of the multiple power line terminals is the same. The stator according to claim 1 or claim 2.

4. There are multiple power line busbars, and in each of the multiple power line busbars, at least the shape of the power line busbar body and the power line terminals are identical. The stator according to claim 1.

Images