Stator and motor

Abstract

This stator (3) comprises: a stator core (6) in which a rotor (4) is rotatably accommodated; a plurality of coils (2) that are disposed in the circumferential direction of the stator core and each have one end connected to an external terminal (5); and a neutral point bus bar (11) which is disposed at an axial end of the stator core and to which the other end of each of the plurality of coils is connected. The plurality of coils and the neutral point bus bar constitute a plurality of systems, and the neutral point bus bar has a coil connection part (13) to which the other end of each of the plurality of coils is connected. The coil connection part is disposed on the inside of the stator core in the radial direction. At least one of the plurality of coils has a routing part (19) which is drawn out from the stator core and laid on the outside of the coil connection part in the radial direction of the stator core and thereby connected to the external terminal.

Description

Stator and motor CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on Japanese Application No. 2023-209470, filed on December 12, 2023, the contents of which are incorporated herein by reference.

[0002] The present disclosure relates to a stator and a motor.

[0003] A rotating electric machine (terminal module) that rotates using three-phase AC power is known, as disclosed in Patent Document 1. The terminal module described in Patent Document 1 includes a polygonal rail with a plurality of grooves and a plurality of polygonal bus bars fitted into the grooves. The bus bars are provided for each of the U-phase, V-phase, W-phase, and neutral functions.

[0004] Patent No. 4789676

[0005] However, in the case of the rotating electric machine of Patent Document 1, the cumbersome task of fitting the bus bars into the grooves is required, which poses a problem in the workability of manufacturing the terminal module. An object of the present disclosure is to provide a stator and a motor that can simplify the manufacturing work.

[0006] In a first aspect of the present disclosure, a stator comprises a stator core in which a rotor is rotatably accommodated, a plurality of coils arranged circumferentially around the stator core and having one end connected to an external terminal, and a neutral bus bar arranged at an axial end of the stator core and having the other ends of the plurality of coils connected thereto, wherein the plurality of coils and the neutral bus bar form multiple systems, the neutral bus bar has a coil connection portion to which the other ends of the plurality of coils are connected, the coil connection portion is arranged radially inward of the stator core, and at least one of the plurality of coils has a wiring portion that is pulled out from the stator core and is routed radially outside the stator core relative to the coil connection portion to connect to the external terminal.

[0007] In a second aspect of the present disclosure, a motor is configured to include a stator and a rotor rotatably accommodated inside the stator, wherein the stator includes a stator core in which the rotor is rotatably accommodated, a plurality of coils arranged circumferentially around the stator core and having one end connected to an external terminal, and a neutral point bus bar arranged at an axial end of the stator core and to which the other ends of the plurality of coils are connected, wherein the plurality of coils and the neutral point bus bar form multiple systems, and the neutral point bus bar has a coil connection portion to which the other ends of the plurality of coils are connected, the coil connection portion is arranged radially inward of the stator core, and at least one of the plurality of coils has a wiring portion that is pulled out from the stator core and is routed radially outside the stator core relative to the coil connection portion to be connected to the external terminal.

[0008] According to this configuration, the coil connection portions of the neutral bus bars for the multiple systems are positioned radially inward of the stator core, so an open space where no coil connection portions exist is formed radially outward of the stator core from the coil connection portions. This open space is used as a coil routing space, so one end of the coil can be routed toward the external terminal without the need for complicated alignment. This simplifies the stator manufacturing process.

[0009] The above and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which Fig. 1 is a perspective view of a stator according to one embodiment, Fig. 2 is a schematic diagram showing the coil winding structure of the stator, Fig. 3 is a configuration diagram of a busbar module, Fig. 4 is a cross-sectional view showing the coil routing structure of the stator, Fig. 5 is a perspective view of a stator having a stator mold portion, Fig. 6 is an enlarged perspective view of a portion of the stator, Fig. 7 is a schematic diagram of a busbar module in a conventional position, and Fig. 8 is a schematic diagram of the busbar module of this example.

[0010] An embodiment of the present disclosure will now be described. (Motor 1) As shown in Fig. 2, motor 1 includes a stator 3 having a plurality of coils 2 formed by winding a wire rod arranged in a circumferential direction (the direction of arrow R shown in Fig. 2, etc.), and a rotor 4 rotatably housed inside stator 3. Motor 1 of this example is an inner rotor type in which rotor 4 is located inside stator 3. Motor 1 of this example is a brushless motor that rotates rotor 4 by passing three-phase alternating current through coil 2 through on / off control of switching elements (not shown).

[0011] As shown in Fig. 1, the motor 1 is a multiple-system motor (multiple motor) having multiple systems (two systems in this example) of three-phase AC electric circuits. In this example, the motor 1 includes a first system having U-phase, V-phase, and W-phase, and a second system having A-phase, B-phase, and C-phase. The motor 1 in this example is also a multiple-inverter-driven type in which each system is driven by a different inverter (not shown).

[0012] Each phase of the motor 1 has, for example, four coils 2. The coil ends of each coil 2 are arranged together for each phase. In this example, for example, starting from the U-phase coil end group, the V-phase coil end group, the W-phase coil end group, the A-phase coil end group, the B-phase coil end group, and the C-phase coil end group are arranged in this order counterclockwise on the page. Therefore, when the stator 3 is divided into two at the center as viewed from the axial direction of the stator 3 (the Z-axis direction in FIG. 1 , etc.), the U-phase to W-phase coil end groups are arranged in one region (left side), and the A-phase to C-phase coil end groups are arranged in the other region (right side).

[0013] 2 , the coils 2 for each phase are arranged in the order of A-phase, U-phase, B-phase, V-phase, C-phase, and W-phase in a counterclockwise direction on the page in the circumferential direction of the stator 3. In this manner, the coils 2 are arranged in a coil arrangement in which the coils for the first system and the coils for the second system are arranged alternately in the circumferential direction of the stator core 6. In this example, four coils 2 (U1 to U4, V1 to V4, W1 to W4, A1 to A4, B1 to B4, and C1 to C4 in this example) are formed for each of the U-phase to W-phase and the A-phase to C-phase. Therefore, the arrangement of the coils 2 for the A-phase, U-phase, B-phase, V-phase, C-phase, and W-phase is repeated four times in the circumferential direction of the stator 3.

[0014] The coils 2 of the same phase are arranged at 90-degree intervals around the circumferential direction of the stator 3. The angle formed between the coil group of the first system (U-phase, V-phase, W-phase) and the coil group of the second system (A-phase, B-phase, C-phase) is set to 15 degrees around the circumferential direction of the stator 3. The angle formed between the nearest coils 2 of the U-phase to W-phase coils is set to 30 degrees. The angle formed between the nearest coils 2 of the A-phase to C-phase coils is set to 30 degrees. The coil ends of each coil 2 are connected to an inverter or the like via external terminals 5.

[0015] In the case of a multiple-inverter-driven, multiple-system motor, the motor 1 is driven by multiple inverters, resulting in high motor output. Furthermore, if the motor 1 has two three-phase AC circuits (a system for U-phase to W-phase and a system for A-phase to C-phase), even if an abnormality occurs in one system, the motor can continue to be controlled by the other system, preventing the motor from becoming uncontrollable. This contributes to improving the redundancy of motor control.

[0016] 1, the stator 3 includes a stator core 6 and a stator mold portion 7 in addition to the coils 2. The stator 3 has the rotor 4 rotatably housed inside the stator core 6. Inside the stator core 6, a plurality of teeth 8 for winding the coils 2 are arranged at equal intervals in the circumferential direction. The stator 3 in this example is a 24-slot type with 24 coils 2.

[0017] (Busbar module 10) As shown in Fig. 1 and Fig. 3, the stator 3 includes a busbar module 10 that connects the neutral points of the three-phase AC coils 2. As shown in Fig. 3, the busbar module 10 includes a neutral busbar 11 to which one end of the coil 2 is connected, the other end of which is connected to the external terminal 5, and a busbar molded portion 12 that seals the neutral busbar 11. The busbar module 10 is disposed at the end of the stator core 6 in the axial direction (the Z-axis direction in Fig. 1, etc.). The busbar module 10 is formed in a shape that follows the circumferential direction of the stator core 6, specifically, in a circular ring shape.

[0018] 1 and 3 , the busbar molded portion 12 seals, for example, the neutral point busbar 11 except for the coil connection portion 13 with resin. That is, the busbar molded portion 12 is made of resin and seals the busbar body 14 of the neutral point busbar 11 with resin. The busbar molded portion 12 is formed, for example, in an annular shape (in this example, annular) along the axial end of the stator 3. As shown in FIG. 1 , a plurality of legs 15 to be placed on the upper surface of the stator core 6 are formed at predetermined intervals in the circumferential direction on the back surface of the busbar molded portion 12.

[0019] 3 , the neutral point bus bar 11 is formed, for example, in a shape that follows at least a part of the circumferential direction at the axial end edge of the stator core 6. Specifically, the neutral point bus bar 11 (bus bar main body 14) is formed in an annular shape (in this example, annular) that follows the circumferential direction of the stator core 6.

[0020] In this example, the neutral point busbars 11 include a first neutral point busbar 11a for the first system and a second neutral point busbar 11b for the second system. That is, one of the first neutral point busbar 11a and the second neutral point busbar 11b is the neutral point busbar 11 for U-phase to V-phase, and the other is the neutral point busbar 11 for A-phase to C-phase. In this way, the busbar module 10 has a neutral point busbar 11 for each system. The diameter of the first neutral point busbar 11a is smaller than the diameter of the second neutral point busbar 11b.

[0021] As shown in Fig. 4, the coil connection portion 13 is integrally formed with the busbar body 14 and is exposed to the outside of the busbar molded portion 12. For example, the coil connection portion 13 is formed in a generally L-shape with its tip extending axially outward from the stator core 6 (in the +Z-axis direction in Fig. 4). The coil connection portion 13 is disposed radially inward from the annular neutral busbar 11. In this example, the other end of the coil 2 is fixed to the side portion of the coil connection portion 13.

[0022] The busbar bodies 14 of the first neutral point busbar 11a and the second neutral point busbar 11b are arranged so as not to overlap in the radial direction (left-right direction on the paper in FIG. 4) of the stator core 6 and so as not to overlap in the direction perpendicular to the radial direction (up-down direction on the paper in FIG. 4). In this example, the busbar body 14 of the first neutral point busbar 11a is arranged radially inward of the busbar body 14 of the second neutral point busbar 11b. In addition, the busbar body 14 of the first neutral point busbar 11a is arranged closer to the coil end than the busbar body 14 of the second neutral point busbar 11b.

[0023] The coil connection portions 13 of the first neutral point busbar 11a and the second neutral point busbar 11b are arranged alternately in the circumferential direction of the stator core 6. The base end of the coil connection portion 13 of the first neutral point busbar 11a is arranged closer to the coil end than the base end of the coil connection portion 13 of the second neutral point busbar 11b. The tips of the coil connection portions 13 of the first neutral point busbar 11a and the second neutral point busbar 11b are formed at the same height.

[0024] (Coil 2) As shown in Fig. 1 , a plurality of coils 2 are arranged in the circumferential direction of the stator core 6. The coils 2 have core wires 17 wound around the teeth 8 of the stator core 6. The core wires 17 are, for example, enameled wires. The core wires 17 have insulating coatings 18 baked onto their surfaces. Examples of insulating coatings 18 include PI (polyimide), PPS (polyphenylene sulfide), PEEK (polyether ether ketone), and PAI (polyamide imide).

[0025] 1 , at least one of the multiple coils 2 has an arrangement section 19 that is drawn out from the stator core 6, arranged at an axial end of the stator core 6, and connected to the external terminal 5. In this example, the arrangement section 19 forms a wiring group by, for example, arranging the coil ends of each of the coils 2 of the U-phase, V-phase, W-phase, A-phase, B-phase, and C-phase at the axial end of the stator core 6. In other words, the arrangement section 19 forms a coil bundle arranged at the axial end of the stator core 6.

[0026] 4 , the wiring section 19 is disposed radially outward of the coil connection section 13 of the neutral bus bar 11 and is connected to the external terminal 5. Specifically, the wiring section 19 is disposed in an area Ea that is open radially outward on the surface of the bus bar module 10. In this example, the wiring section 19 is routed radially outward of the stator core 6 relative to the coil connection section 13 and is connected to the external terminal 5. The wiring section 19 is formed by wiring the coil 2 in the circumferential direction of the stator core 6.

[0027] The routing portion 19 is disposed, for example, at a position overlapping the busbar molded portion 12 in the thickness direction of the busbar module 10 (the Z-axis direction in FIG. 4 ). Specifically, the routing portion 19 is disposed on the surface of the busbar molded portion 12 in the thickness direction (the surface on the +Z-axis direction side in FIG. 4 ). Therefore, the busbar molded portion 12 supports the routing portion 19 on a surface 21 opposite to a surface 20 facing the coil ends. In this example, the surface 20 facing the coil ends is the back surface of the busbar molded portion 12. The surface 21 opposite to the surface 20 facing the coil ends is the front surface of the busbar molded portion 12.

[0028] (Stator mold portion 7) As shown in Figs. 1 and 5, the stator mold portion 7 seals at least the wiring portion 19 with resin at the axial end portion of the stator core 6. In this example, the stator mold portion 7 seals at least the bus bar module 10 (neutral point bus bar 11) and the wiring portion 19. In this manner, the stator 3 is partially sealed with the stator mold portion 7 made of resin. Note that the stator mold portion 7 may be formed in the gap between adjacent teeth 8. The stator mold portion 7 is made of, for example, epoxy resin.

[0029] (Cylindrical body 23) As shown in Figures 1, 4, and 6, the coil 2 has an insulating cylindrical body 23 that houses the core wire 17 of the coil 2 inside in the routing portion 19. The cylindrical body 23 is provided, for example, to protect the coil 2 (core wire 17) from noise. The cylindrical body 23 is, for example, a heat-shrinkable tube. The heat-shrinkable tube is made of, for example, a fluororesin. Examples of fluororesins include FEP (fluorinated ethylene propylene) and fluororubber.

[0030] (Operation of the Embodiment) Next, the operation of the stator 3 (motor 1) of this embodiment will be described. As shown in FIG. 4 , the coil connection portions 13 of the neutral bus bars 11 of multiple systems are arranged together radially inside the stator core 6. As a result, an open space (area Ea in this example) where no coil connection portions 13 exist is formed radially outside the stator core 6 from the coil connection portions 13, and this open space can be used as a routing space for the coil 2. This allows the coil 2 to be routed from outside the coil connection portions 13, making it possible to route the coil 2 without complicated alignment. This makes it possible to simplify the manufacturing process of the stator 3.

[0031] 7 shows a busbar module 30 having a conventional configuration. This busbar module 30 has one of a first neutral point busbar 31a and a second neutral point busbar 31b at one end in the radial direction (left-right direction in FIG. 7 ) of the busbar module 30, and the other of these at the other end in the radial direction (left-right direction in FIG. 7 ). Therefore, if the width L of the busbar module 30 needs to be kept within a certain value, the coil groups of the wiring section 32 need to be stacked in the height direction of the busbar module 30. This raises a concern that the busbar module 30 will be increased in size in the height direction, and the stator 3 will be increased in size in the axial direction.

[0032] 8 , the coil connection portions 13 of both the first neutral point bus bar 11a and the second neutral point bus bar 11b are arranged radially inward of the stator core 6, and therefore both coil connection portions 13 are arranged together on one radial side of the bus bar module 10. Therefore, compared to when the coil connection portions 13 are arranged on both radial sides of the bus bar module 10, it is possible to make the bus bar molded portion 12 wider in the width direction.

[0033] This allows for a larger space to be provided for the wiring section 19 on the surface of the busbar molded section 12. This allows the coil groups of the wiring section 19 to be arranged wider in the width direction, thereby reducing the height of the wiring section 19. This allows for a smaller size of the busbar module 10 in the height direction, which in turn contributes to a smaller size of the stator 3 in the height direction.

[0034] (Effects of the Embodiments) The configuration of the above-described embodiment can achieve the following effects. (1) The stator 3 includes a stator core 6 in which the rotor 4 is rotatably accommodated, a plurality of coils 2 arranged circumferentially around the stator core 6 and having one ends connected to the external terminals 5, and a neutral bus bar 11 arranged at an axial end of the stator core 6 and having the other ends of the plurality of coils 2 connected thereto. The plurality of coils 2 and the neutral bus bar 11 form multiple systems. The neutral bus bar 11 has coil connection portions 13 to which the other ends of the plurality of coils 2 are connected. The coil connection portions 13 are arranged radially inward of the stator core 6. At least one of the plurality of coils 2 has a wiring portion 19 that is drawn out from the stator core 6 and is routed radially outward of the stator core 6 relative to the coil connection portions 13 to be connected to the external terminals 5.

[0035] According to this configuration, the coil connection portions 13 of the neutral bus bars 11 for multiple systems are disposed radially inward of the stator core 6, so that an open space (area Ea in this example) where no coil connection portions 13 are present is formed radially outward of the stator core 6 from the coil connection portions 13. In this configuration, this open space is used as a routing space for the coil 2, so one end of the coil 2 can be routed toward the external terminal 5 without the need for complicated alignment. This simplifies the manufacturing process of the stator 3.

[0036] (2) The neutral point bus bar 11 includes a first neutral point bus bar 11 a for the first system and a second neutral point bus bar 11 b for the second system. With this configuration, the motor 1 can be made redundant by using two sets of coils 2 and neutral point bus bars 11.

[0037] (3) The stator 3 includes a busbar module 10 having the neutral point busbar 11 and a busbar mold portion 12 that seals the busbar body 14 of the neutral point busbar 11 with resin. The busbar bodies 14 of the first neutral point busbar 11a and the second neutral point busbar 11b are arranged so as not to overlap in the radial direction of the stator core 6 and so as not to overlap in a direction perpendicular to the radial direction. With this configuration, the busbar module 10 can be molded by pressing the busbar bodies 14 of the first neutral point busbar 11a and the second neutral point busbar 11b with a mold.

[0038] (4) The multiple coils 2 are arranged in a coil configuration in which first system coils (e.g., U-phase to W-phase coils 2) and second system coils (e.g., A-phase to C-phase coils 2) are alternately arranged in the circumferential direction of the stator core 6. The busbar body 14 is formed in an annular shape along the circumferential direction of the stator core 6. The coil connection portions 13 of the first neutral point busbar 11a and the second neutral point busbar 11b are alternately arranged in the circumferential direction of the stator core 6. This configuration makes it possible to arrange each of the multiple coils 2 close to its paired coil connection portion 13. This simplifies the process of connecting each coil 2 to the coil connection portion 13. This further contributes to simplifying the manufacturing process of the stator 3.

[0039] (5) The stator 3 includes a stator mold portion 7 that seals at least the wiring portion 19 with resin at the axial end of the stator core 6. With this configuration, the coil 2 of the wiring portion 19 is fixed by the stator mold portion 7, making it possible to prevent the coil 2 of the wiring portion 19 from shifting in position.

[0040] (Other Embodiments) This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0041] The wiring section 19 does not necessarily have to be arranged on the top surface (surface 21) of the busbar module 10, but may be arranged, for example, on the side or back surface of the busbar module 10 as long as the route follows the neutral point busbar 11.

[0042] The number of coil connection portions 13 of the neutral bus bar 11 does not need to be equal to the number of coils 2, and may be less than the number of coils 2. In this case, the plurality of coils 2 share the common coil connection portion 13.

[0043] The neutral point busbar 11 (busbar module 10) does not have to be circular, but may be a portion of a circular ring, specifically an arc shape. The neutral point busbar 11 (busbar main body 14) does not have to be circular, but may be, for example, a busbar piece with one coil connection portion 13 extending from a small, square metal piece. In this case, the neutral point busbar 11 may be configured to have only one busbar piece.

[0044] The neutral point bus bar 11 does not necessarily have to be disposed at the axial end of the stator core 6, but may be disposed at another position, for example, on the outer surface of the stator core 6. In this case, the wiring portion 19 does not necessarily have to be disposed along the neutral point bus bar 11, but may be disposed at the axial end of the stator core 6, for example.

[0045] The coil 2 is not limited to concentrated winding, but may be distributed winding. The stator molded portion 7 is only required to seal at least the wiring portion 19, and may have a shape that does not seal, for example, the bus bar module 10 or gaps between the teeth 8.

[0046] The number of slots of the stator 3 is not limited to 24 and may be changed to another number, such as 12. The number of poles of the rotor 4 may be set as needed.

[0047] The material of the heat-shrinkable tube of the cylindrical body 23 may be, other than fluorine-based resin, for example, polyolefin, polyvinyl chloride, polytetrafluoroethylene, polyvinylidene fluoride, silicone, elastomer, or the like.

[0048] The motor 1 and the stator 3 are preferably mounted on, for example, air mobility. The mounting target is not limited to air mobility, and may be mounted on vehicles such as passenger cars. The motor 1 and the stator 3 are not limited to being mounted on mobility, and may be mounted on various devices and apparatuses that require a rotational drive source.

[0049] The phrase "at least one" used in this disclosure means "one or more" of the desired options. As an example, the phrase "at least one" used in this disclosure means "only one option" or "both of two options" if the number of options is two. As another example, the phrase "at least one" used in this disclosure means "only one option" or "any combination of two or more options" if the number of options is three or more.

[0050] While the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to the embodiments or structures. The present disclosure also encompasses various modifications and modifications within the scope of equivalents. In addition, various combinations and forms, including only one element, more than one element, or less than one element, are also within the scope and spirit of the present disclosure.

[0051] Next, the technical ideas that can be understood from the above-described embodiment and modified examples will be described. [1] A stator (3) comprising: a stator core (6) in which a rotor (4) is rotatably housed; a plurality of coils (2) arranged in the circumferential direction of the stator core and having one ends connected to external terminals (5); and a neutral point bus bar (11) arranged at an axial end of the stator core and having the other ends of the plurality of coils connected thereto; the plurality of coils and the neutral point bus bar constituting a plurality of systems; the neutral point bus bar having coil connection portions (13) to which the other ends of the plurality of coils are connected; the coil connection portions being arranged radially inward of the stator core; and at least one of the plurality of coils having a wiring portion (19) drawn out from the stator core and routed radially outward of the stator core relative to the coil connection portions to connect to the external terminals.

[0052] [2] The stator according to [1], wherein the neutral point busbar includes a first neutral point busbar (11a) for a first system and a second neutral point busbar (11b) for a second system. [3] The stator according to [2], further comprising: a busbar module (10) including the neutral point busbar and a busbar molded part that seals a busbar body (14) of the neutral point busbar with resin, wherein the busbar bodies of the first neutral point busbar and the second neutral point busbar are arranged so as not to overlap in a radial direction of the stator core and so as not to overlap in a direction perpendicular to the radial direction.

[0053] [4] The stator described in [2] above, wherein the plurality of coils are arranged in a coil configuration in which coils for the first system and coils for the second system are arranged alternately in the circumferential direction of the stator core, the busbar body of the neutral point busbar is formed in a ring shape along the circumferential direction of the stator core, and the coil connection portions of each of the first neutral point busbar and the second neutral point busbar are arranged alternately in the circumferential direction of the stator core.

[0054] [5] The stator according to any one of the above [1] to [4], comprising a stator molded portion (7) that seals at least the wiring portion with resin at the axial end of the stator core.

Claims

1. A stator comprising: a stator core (6) in which a rotor (4) is rotatably housed; a plurality of coils (2) arranged circumferentially around the stator core and having one ends connected to an external terminal (5); and a neutral bus bar (11) arranged at an axial end of the stator core and to which the other ends of the plurality of coils are connected, wherein the plurality of coils and the neutral bus bar constitute multiple systems, the neutral bus bar has a coil connection portion (13) to which the other ends of the plurality of coils are connected, the coil connection portion is arranged radially inward of the stator core, and at least one of the plurality of coils has a wiring portion (19) that is pulled out of the stator core and is routed radially outside the stator core relative to the coil connection portion to connect to the external terminal.

2. The stator according to claim 1, wherein the neutral busbar comprises a first neutral busbar (11a) for a first system and a second neutral busbar (11b) for a second system.

3. A stator as described in claim 2, comprising a busbar module (10) having the neutral point busbar and a busbar molded portion that seals the busbar body (14) of the neutral point busbar with resin, wherein the busbar bodies of the first neutral point busbar and the second neutral point busbar are arranged so as not to overlap in the radial direction of the stator core and so as not to overlap in a direction perpendicular to the radial direction.

4. A stator as described in claim 2, wherein the plurality of coils are arranged in a coil arrangement in which the coils for the first system and the coils for the second system are arranged alternately in the circumferential direction of the stator core, the busbar body of the neutral point busbar is formed in an annular shape along the circumferential direction of the stator core, and the coil connection portions of the first neutral point busbar and the second neutral point busbar are arranged alternately in the circumferential direction of the stator core.

5. A stator according to claim 1, further comprising a stator molded portion (7) for sealing at least the wiring portion with resin at an axial end portion of the stator core.

6. A motor (1) comprising a stator (3) and a rotor (4) rotatably housed inside the stator, wherein the stator comprises a stator core (6) in which the rotor is rotatably housed, a plurality of coils (2) arranged in the circumferential direction of the stator core and having one ends connected to an external terminal (5), and a neutral point bus bar (11) arranged at an axial end of the stator core and to which the other ends of the plurality of coils are connected, wherein the plurality of coils and the neutral point bus bar constitute a plurality of systems, and the neutral point bus bar has a coil connection portion (13) to which the other ends of the plurality of coils are connected, the coil connection portion is arranged radially inward of the stator core, and at least one of the plurality of coils has an arrangement portion (19) that is drawn out from the stator core and is routed radially outside the stator core relative to the coil connection portion to be connected to the external terminal.

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