Stator and motor

Abstract

A 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 have one end connected to an external terminal (5); and a neutral bus bar (11) to which the other end of the plurality of coils is connected. The neutral bus bar is formed in a shape along at least a part in the circumferential direction of an end in the axial direction of the stator core. At least one of the plurality of coils has a routing part (19) that is drawn out from the stator core and routed along the neutral bus bar so as to be connected to the external terminal.

Description

Stator and motor CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on Japanese Application No. 2023-209471 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] In the case of Patent Document 1, bus bars are used for the wiring of the U-phase to W-phase and the neutral point, so there are many points where adjacent bus bars are connected to each other, which raises concerns that the stator, and therefore the motor, will become larger in size due to the large number of connections between the bus bars.

[0006] In a first aspect of the present disclosure, a stator includes a stator core in which a rotor is rotatably housed, a plurality of coils arranged circumferentially around the stator core and having one end connected to an external terminal, and a neutral bus bar to which the other ends of the plurality of coils are connected, the neutral bus bar being formed in a shape that follows at least a portion of the circumferential direction at an end of the stator core in an axial direction, and at least one of the plurality of coils has a wiring portion that is drawn out from the stator core and is routed along the neutral bus bar to connect to the external terminal.

[0007] In a second aspect of the present disclosure, a motor includes a stator and a rotor rotatably housed inside the stator, wherein the stator includes a stator core in which the rotor is rotatably housed, a plurality of coils arranged circumferentially around the stator core and having one end connected to an external terminal, and a neutral bus bar to which the other ends of the plurality of coils are connected, wherein the neutral bus bar is formed in a shape that follows at least a portion of the circumferential direction at the axial end of the stator core, and at least one of the plurality of coils has an arrangement portion that is drawn out from the stator core and arranged along the neutral bus bar to connect to the external terminal.

[0008] According to this configuration, the wiring portion of the coil that is drawn out from the stator core and connected to the external terminal is routed along the neutral bus bar. This reduces the number of wiring connections compared to when a bus bar is used as the wiring portion, thereby enabling the stator to be made smaller.

[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 a perspective view showing the shape of a support portion, Fig. 7 is a cross-sectional view showing the binding structure of a first binding portion, and Fig. 8 is a perspective view showing the binding structure of a second binding portion.

[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 along the neutral bus bar 11 (in this example, the bus bar main body 14), and connected to the external terminal 5. The arrangement section 19 forms a wiring group by, for example, arranging the coil ends of each of the U-phase, V-phase, W-phase, A-phase, B-phase, and C-phase coils 2 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 formed by wiring the coil 2 in the circumferential direction of the stator core 6. In particular, the wiring section 19 in this example is arranged radially outward from the coil connection section 13 of the neutral point bus bar 11 and is connected to the external terminal 5. Specifically, the wiring section 19 is arranged 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 from the coil connection section 13 of the stator core 6 and is connected to the external terminal 5.

[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] (Supporting portion 26) As shown in Fig. 6, the busbar molded portion 12 has supporting portions 26 that support the base ends of the wiring portion 19. In this example, the supporting portions 26 are formed on the outer surface of the busbar molded portion 12. The supporting portions 26 are formed, for example, in the shape of clips that clamp and support the coils 2 that are elements of the wiring portion 19. The supporting portions 26 clamp the cylindrical bodies 23 of the coils 2. One supporting portion 26 is formed for each coil 2 that constitutes the wiring portion 19.

[0031] (Binding portion 27) As shown in Figures 6 and 7, the stator 3 includes a binding portion 27 (referred to as a first binding portion 28 in this example) that secures the coil end of the coil 2 to the busbar molded portion 12. The first binding portion 28 is, for example, a string member. The first binding portion 28 has insulating properties and is made of, for example, PPS (polyphenylene sulfide) resin. It is preferable that a plurality of first binding portions 28 are arranged at predetermined intervals in the circumferential direction of the stator core 6. When the first binding portion 28 is string-shaped, it secures the coil end of the coil 2 to the busbar molded portion 12 by binding them together. It is preferable that the string-shaped first binding portion 28 has a plurality of turns.

[0032] As shown in Fig. 8, the stator 3 includes a bundling portion 27 (referred to as a second bundling portion 29 in this example) that secures the busbar molded portion 12 and the wiring portion 19 together. The second bundling portion 29 is, for example, a string member. It is preferable that a plurality of second bundling portions 29 are arranged at predetermined intervals in the circumferential direction of the stator core 6. When the second bundling portion 29 is string-shaped, it secures the coil ends of the coil 2 to the busbar molded portion 12 by bundling them together. It is preferable that the string-shaped second bundling portion 29 has a plurality of turns.

[0033] (Groove 31) As shown in FIGS. 6 and 8 , the busbar molded section 12 has a groove 31 that accommodates a portion of the bundling section 27. In this example, the groove 31 includes a first groove 32 (see FIG. 6 ) that accommodates a portion of the first bundling section 28 and a second groove 33 (see FIG. 8 ) that accommodates a portion of the second bundling section 29. As shown in FIG. 6 , the first groove 32 is formed, for example, on the surface of the busbar molded section 12. That is, the first groove 32 is formed on the surface 21 of the busbar molded section 12 on which the wiring section 19 is disposed. The groove path of the first groove 32 extends in the radial direction of the busbar module 10. Note that the first groove 32 may be formed on a side surface of the busbar molded section 12 instead of on the surface, or on both the surface and the side surface.

[0034] 8 , the second grooves 33 are formed, for example, on the back surface of the busbar molded section 12. That is, the second grooves 33 are formed on the surface 20 of the busbar molded section 12 that faces the coil ends. The groove paths of the second grooves 33 extend in the radial direction of the busbar module 10. Note that the second grooves 33 may be formed on the side surfaces of the busbar molded section 12 instead of the back surface, or may be formed on both the back surface and the side surfaces.

[0035] 6 and 7 , an accommodation groove 34 that accommodates a part of the first bundling portion 28 is formed in the axial end face of the stator core 6. The accommodation groove 34 is formed, for example, in a position facing the coil end on the axial end face of the stator core 6. The groove path of the accommodation groove 34 extends in the radial direction of the stator core 6. The accommodation groove 34 is used as a passage when winding the first bundling portion 28 around the coil 2 and the bus bar module 10.

[0036] (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 stator 3 has an arrangement section 19 consisting of a bundle of coils 2 that are drawn out from the stator core 6 and connected to the external terminals 5. In this example, the arrangement section 19 arranges the coils 2 drawn out from the stator core 6 in the circumferential direction so as to run along the neutral point bus bar 11. In other words, the arrangement section 19 has a structure in which the coils 2 drawn out from the stator core 6 are routed along the neutral point bus bar 11.

[0037] When bus bars are used as the wiring section 19, adjacent bus bars must be connected by welding or the like, resulting in a relatively large number of connection points. In contrast, when the wiring section 19 is structured as in this example by routing the coil 2, it is possible to reduce the number of wiring connection points compared to when bus bars are used. This makes it possible to reduce the size of the stator 3 and, ultimately, the motor 1. Furthermore, reducing the number of wiring connection points reduces the number of manufacturing processes, which simplifies the manufacturing process.

[0038] Furthermore, in this example, the coil 2 of the wiring portion 19 is routed along the neutral bus bar 11, so that they can be arranged as close as possible to each other, which further contributes to the miniaturization of the stator 3 and therefore the motor 1.

[0039] (Effects of the Embodiments) The configuration of the above-described embodiments can achieve the following effects: (1) The stator 3 includes a stator core 6 in which the rotor 4 is rotatably housed, a plurality of coils 2 arranged in the circumferential direction of the stator core 6 and having one ends connected to the external terminals 5, and a neutral point bus bar 11 to which the other ends of the plurality of coils 2 are connected. The neutral point bus bar 11 is formed in a shape that follows at least a portion of the circumferential direction at the axial end of the stator core 6. At least one of the plurality of coils 2 has an arrangement portion 19 that is drawn out from the stator core 6 and arranged along the neutral point bus bar 11 to connect to the external terminals 5.

[0040] According to this configuration, the wiring portion 19 of the coil 2, which is drawn out from the stator core 6 and connected to the external terminal 5, is routed along the neutral bus bar 11. Therefore, compared to when a bus bar is used as the wiring portion 19, it is possible to reduce the number of wiring connection points, thereby enabling the stator 3 to be made smaller.

[0041] (2) The stator 3 has the busbar molded portion 12 that seals the busbar body 14 of the neutral point busbar 11 with resin. With this configuration, the busbar body 14 of the neutral point busbar 11 and the wiring portion 19 can be insulated by the busbar molded portion 12.

[0042] (3) The busbar molded portion 12 supports the wiring portion 19 on the surface 21 opposite to the surface 20 facing the coil end. With this configuration, the wiring portion 19 can be supported by the busbar molded portion 12, so that even if the motor 1 vibrates, the wiring portion 19 can be held in a positioned state by the busbar molded portion 12.

[0043] (4) The busbar molded portion 12 has the support portion 26 that supports the base end of the wiring portion 19. With this configuration, the support portion 26 can firmly hold the coil 2 of the wiring portion 19. Furthermore, the coil 2 can be positioned and held at a desired position.

[0044] (5) The stator 3 includes bundling portions 27 (first bundling portions 28) that secure the coil ends of the multiple coils 2 to the busbar molded portion 12. This configuration can suppress shaking and misalignment of the neutral point busbar 11 (busbar module 10).

[0045] (6) The stator 3 includes the bundling portion 27 (second bundling portion 29) that fixes the busbar molded portion 12 and the wiring portion 19. With this configuration, the wiring portion 19 is fixed to the busbar molded portion 12 (busbar module 10) by the second bundling portion 29, which can suppress shaking and displacement of the wiring portion 19.

[0046] (7) The busbar molded portion 12 has a groove 31 (first groove 32 in this example) that accommodates a part of the binding portion 27 (first binding portion 28 in this example). With this configuration, the first groove 32 can position the first binding portion 28.

[0047] (8) 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 difficult for the coil 2 of the wiring portion 19 to become misaligned.

[0048] (9) The coil connection portions 13 are disposed radially inward of the neutral bus bar 11. The wiring portions 19 are routed radially outward of the coil connection portions 13 and connected to the external terminals 5. With 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 an open space (in this example, area Ea) where no coil connection portions 13 exist is formed radially outward of the stator core 6 from the coil connection portions 13. With this configuration, this open space is used as a wiring 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.

[0049] (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.

[0050] The coil connection portion 13 does not necessarily have to be disposed radially inside the neutral bus bar 11, but may be disposed radially outside the neutral bus bar 11. In this case, the coil 2 of the routing portion 19 is disposed radially inside the coil connection portion 13 of the neutral bus bar 11 and connected to the external terminal 5. This configuration also makes it easy to route (wire) the coil 2, thereby simplifying the manufacturing process of the stator 3.

[0051] As described above, the neutral point bus bar 11 only needs to have the coil connection portion 13 disposed radially inside or outside and connected to the other end of the coil 2. The wiring portion 19 only needs to be drawn out from the radially opposite side of the other end connected to the coil connection portion 13 and connected to the external terminal 5. This configuration makes it possible to space apart one end of the coil drawn out as the wiring portion 19 from the stator core 6 and the other end of the coil connected to the coil connection portion 13 of the neutral point bus bar 11. Therefore, the wiring of the coil 2 is not densely packed, improving the workability of wiring the coil 2.

[0052] The busbar module 10 preferably includes the neutral busbar 11 and the busbar molded portion 12 and is disposed between the coil end of the coil 2 and the wiring portion 19 .

[0053] 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.

[0054] 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.

[0055] The neutral busbar 11 (busbar module 10) does not have to be circular, but may be a portion of a circular ring, specifically an arc. The coil 2 does not have to be routed circumferentially, but may be arranged along the neutral busbar 11.

[0056] The coil 2 does not have to be concentrated winding, but may be distributed winding. The support portion 26 does not have to be arranged on the side surface of the bus bar module 10, but may be arranged on the top surface or back surface, for example.

[0057] The shape of the support portion 26 is not limited to a clip shape and may be changed to other shapes, such as a cantilever locking claw portion or a simple hole. The binding portion 27 is not limited to a string member and may be changed to, for example, a band member.

[0058] The set of the coil 2 and the neutral bus bar 11 is not limited to a plurality of systems, but may be a single system (one system). The stator 3 may be configured without the stator mold portion 7.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 connected at one end to an external terminal (5); and a neutral point bus bar (11) to which the other ends of the plurality of coils are connected, wherein the neutral point bus bar is formed in a shape that follows at least a part of the circumferential direction at an end of the axial direction 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 arranged along the neutral point bus bar to connect to the external terminal.

[0065] [2] The stator according to the above [1], further comprising a busbar molded part (12) that seals the busbar body (14) of the neutral point busbar with resin. [3] The stator according to the above [2], wherein the busbar molded part supports the wiring part on a surface (21) opposite to a surface (20) that faces the coil end.

[0066] [4] The stator according to the above [2], wherein the busbar molded portion has a support portion (26) that supports a base end of the wiring portion. [5] The stator according to the above [2], further comprising a bundling portion (27) that fixes the coil ends of the plurality of coils to the busbar molded portion.

[0067] [6] The stator according to the above [2], further comprising a bundling portion (27) that fixes the busbar molded portion and the wiring portion. [7] The stator according to the above [5] or [6], wherein the busbar molded portion has a groove portion (31) that accommodates a part of the bundling portion.

[0068] [8] A stator according to any one of the above [1] to [7], comprising a stator molded portion (7) that seals at least the wiring portion with resin at the axial end of the stator core.

[0069] [9] The stator according to any one of [1] to [8] above, wherein the neutral bus bar has a coil connection portion (13) arranged radially inside or radially outside and to which the other ends of the plurality of coils are connected, and the wiring portion is drawn out from the radially opposite side of the other ends connected to the coil connection portion and is connected to the external terminal.

[0070]

[10] The stator according to the above [9], wherein the coil connection portion is arranged radially inside the neutral point bus bar, and the wiring portion is routed radially outside the coil connection portion and connected to the external terminal.

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 end connected to an external terminal (5); and a neutral busbar (11) to which the other ends of the plurality of coils are connected, wherein the neutral busbar is formed into a shape that follows at least a portion of the circumferential direction at an axial end of the stator core, and at least one of the plurality of coils has an arrangement portion (19) that is pulled out of the stator core and arranged along the neutral busbar to connect to the external terminal.

2. The stator according to claim 1, further comprising a busbar molded portion (12) that seals the busbar body (14) of the neutral busbar with resin.

3. The stator according to claim 2, wherein the busbar molded portion supports the wiring portion on a surface (21) opposite to a surface (20) facing the coil end.

4. The stator according to claim 2, wherein the busbar molded portion has a support portion (26) that supports a base end of the wiring portion.

5. A stator as set forth in claim 2, further comprising a bundling portion (27) for fixing the coil ends of the plurality of coils to the busbar molded portion.

6. The stator according to claim 2, further comprising a bundling portion (27) for fixing the busbar molded portion and the wiring portion.

7. A stator according to claim 5 or 6, wherein the busbar molded portion has a groove portion (31) that accommodates a part of the bundling portion.

8. 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.

9. A stator as described in claim 1, wherein the neutral bus bar has a coil connection portion (13) arranged radially inward or radially outward and to which the other ends of the plurality of coils are connected, and the wiring portion is pulled out from the radially opposite side of the other ends connected to the coil connection portion and is connected to the external terminal.

10. A stator as described in claim 9, wherein the coil connection portion is disposed radially inward of the neutral bus bar, and the wiring portion is routed radially outward of the coil connection portion and connected to the external terminal.

11. 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 end connected to an external terminal (5), and a neutral point bus bar (11) to which the other ends of the plurality of coils are connected, wherein the neutral point bus bar is formed in a shape that follows at least a portion of the circumferential direction at an axial end 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 arranged along the neutral point bus bar to connect to the external terminal.

Images