Stator and motor

Abstract

A stator (3) is provided with: a stator core (6) that rotatably accommodates a rotor (4) therein; a plurality of coils (2) disposed in the circumferential direction of the stator core; and a stator mold part (7) that seals at least a part of the plurality of coils with a resin. At least one of the plurality of coils has: a routing part (19) that is led out from the stator core, is routed in the circumferential direction of the stator core, and is connected to an external terminal (5); and an insulating cylindrical body (23) that accommodates a core wire (17) therein in the routing part. The stator mold part seals at least the routing part. The cylindrical body has: a first cylindrical body (24) having one end exposed from the stator mold part and the other end embedded in the stator mold part; and a second cylindrical body (25) disposed so as to be separated from the first cylindrical body inside the stator mold part.

Description

Stator and motor CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on Japanese Application No. 2023-209468 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] Conventionally, an armature (stator) of a rotating electric machine that rotates using three-phase AC power is well known, as disclosed in Patent Document 1. In the armature of Patent Document 1, the ends of the coils provided in the armature are routed in the circumferential direction of a stator core to connect the ends of the coils of the same phase to each other.

[0004] Japanese Patent Application Laid-Open No. 2019-134578

[0005] One approach is to protect the coil routing with resin by molding the coil ends with resin, for example. However, in this case, the coil may be damaged by the resin molding die. One way to address this is to attach a tube to the core wire of the coil. However, this approach raises concerns about fluid infiltration through the gap between the core wire and the tube.

[0006] In a first aspect of the present disclosure, a stator includes a stator core having a rotor rotatably accommodated therein, a plurality of coils arranged circumferentially around the stator core, and a stator molded portion sealing at least a portion of the plurality of coils with resin, wherein at least one of the plurality of coils has a wiring portion drawn out from the stator core, wired around the stator core, and connected to an external terminal, and an insulating cylindrical body that houses a core wire in the wiring portion, the stator molded portion sealing at least the wiring portion, and the cylindrical body has a first cylindrical body having one end exposed from the stator molded portion and the other end embedded in the stator molded portion, and a second cylindrical body disposed within the stator molded portion and spaced apart from the first cylindrical body.

[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 a stator molded portion that seals at least a portion of the plurality of coils with resin, wherein at least one of the plurality of coils has an arrangement portion that is drawn out from the stator core and arranged circumferentially around the stator core and connected to an external terminal, and an insulating cylindrical body that houses a core wire inside the arrangement portion, wherein the stator molded portion seals at least the arrangement portion, and the cylindrical body has a first cylindrical body that has one end exposed from the stator molded portion and the other end embedded in the stator molded portion, and a second cylindrical body that is arranged inside the stator molded portion and spaced apart from the first cylindrical body.

[0008] According to this configuration, when the stator molded portion of the stator is manufactured using a mold, the cylindrical body acts as a buffer against the mold, making it less likely that the core wire of the coil will be damaged. This makes it possible to reduce the likelihood of the coil being damaged by the mold. Furthermore, the cylindrical body is divided into a first cylindrical body and a second cylindrical body, and the second cylindrical body is positioned away from the first cylindrical body. Therefore, even if fluid seeps in through the gap between the core wire and the first cylindrical body, the fluid is blocked between the stator molded portion and the core wire, which are tightly attached to each other, thereby preventing the fluid from seeping into the interior of the stator. This makes it possible to both prevent damage to the coil and ensure waterproofing.

[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 arrangement 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 showing the arrangement structure of the first and second cylindrical bodies, and Fig. 8 is a schematic diagram showing the arrangement structure of the first and second cylindrical bodies according to another 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] (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).

[0023] 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. 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.

[0024] 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.

[0025] 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.

[0026] (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.

[0027] 1, 4, and 6, at least one of the multiple coils 2 has an insulating cylindrical body 23 that houses the core wire 17 of the coil 2 inside the wiring section 19. The cylindrical body 23 is provided, for example, to protect the coil 2 (core wire 17) from noise. In this example, the cylindrical body 23 has a first cylindrical body 24 and a second cylindrical body 25. For example, one end of the first cylindrical body 24 is exposed from the stator mold section 7, and the other end is embedded in the stator mold section 7. The second cylindrical body 25 is, for example, arranged inside the stator mold section 7, spaced apart from the first cylindrical body 24.

[0028] The cylindrical body 23 is, for example, a heat-shrinkable tube. The heat-shrinkable tube is made of, for example, a fluororesin. Examples of the fluororesin include FEP (fluorinated ethylene propylene) and fluororubber. Note that the heat-shrinkable tube may be made of a material other than a fluororesin, such as polyolefin, polyvinyl chloride, polytetrafluoroethylene, polyvinylidene fluoride, silicone, or elastomer.

[0029] 7 , at least one of the multiple coils 2 has a bent portion 27 formed by bending in the routing portion 19. In this example, the bent portion 27 is a portion where the coil 2 (core wire 17) is bent at approximately 90 degrees. The first cylindrical body 24 in this example is arranged so as not to cross the bent portion 27. In other words, the first cylindrical body 24 is arranged so that the base end embedded in the stator mold portion 7 does not reach the bent portion 27 of the core wire 17.

[0030] (Operation of the embodiment) Next, the operation of the stator 3 (motor 1) of this embodiment will be described. As shown in Fig. 6, the wiring portion 19 of the coil 2, which is resin-sealed by the stator molded portion 7, is provided with a cylinder 23 (first cylinder 24, second cylinder 25) that covers the periphery of the core wire 17. Therefore, when the stator molded portion 7 is resin-molded into the stator 3, the coil 2 is covered with the cylinder 23, which has a high elastic modulus, so that the coil 2 (core wire 17) can be protected from the molding die. Therefore, when the stator molded portion 7 is resin-molded, it is possible to prevent damage to the coil 2 (core wire 17) by the molding die.

[0031] However, since the core wire 17 and the cylindrical body 23 of the coil 2 are not in tight contact with each other, there is a possibility that a fluid (such as water) may penetrate through this gap. The fluid that penetrates may reach the inside of the stator 3 and cause deterioration of the components of the stator 3, so some kind of countermeasure is necessary.

[0032] 7 , the cylindrical body 23 is divided into a first cylindrical body 24 and a second cylindrical body 25, and the second cylindrical body 25 is positioned away from the first cylindrical body 24, thereby forming a portion (omitted portion Et) in the wiring portion 19 where the cylindrical body 23 is omitted. Incidentally, the omitted portion Et of the cylindrical body 23 is in direct contact with the resin of a metal wire such as an enameled wire, and therefore adheres strongly to the stator molded portion 7. In other words, the adhesive strength between the stator molded portion 7 and the core wire 17 is stronger than the adhesive strength between the stator molded portion 7 and the cylindrical body 23.

[0033] Therefore, the wiring portion 19 of the coil 2 adheres more tightly to the stator molded portion 7 at the omitted portion Et than at the portion where the core wire 17 is covered by the first cylindrical body 24 (the covered portion Es). Therefore, even if a fluid penetrates between the core wire 17 and the first cylindrical body 24, the fluid is less likely to penetrate further inside through the omitted portion Et. Even if a fluid penetrates between the stator molded portion 7 and the first cylindrical body 24, this fluid penetration is also blocked by the omitted portion Et. Therefore, it is possible to prevent the fluid from penetrating into the inside of the stator 3. As described above, it is possible to achieve both damage suppression of the coil 2 and high waterproofness of the stator 3.

[0034] (Effects of the Embodiments) The configuration of the above-described embodiment provides 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 circumferentially around the stator core 6, and a stator mold portion 7 that seals at least a portion of the plurality of coils 2 with resin. At least one of the plurality of coils 2 includes a wiring portion 19 that is drawn out from the stator core 6, is wired around the stator core 6, and is connected to an external terminal 5, and an insulating cylindrical body 23 that houses a core wire 17 within the wiring portion 19. The stator mold portion 7 seals at least the wiring portion 19. The cylindrical body 23 includes a first cylindrical body 24 that has one end exposed from the stator mold portion 7 and the other end embedded in the stator mold portion 7, and a second cylindrical body 25 that is disposed within the stator mold portion 7 and spaced apart from the first cylindrical body 24.

[0035] According to this configuration, when the stator molded portion 7 of the stator 3 is manufactured using a mold, the cylindrical body 23 acts as a buffer against the mold, making the core wire 17 of the coil 2 less likely to be damaged. This makes it possible to reduce the likelihood of the coil 2 being damaged by the mold. Furthermore, the cylindrical body 23 is divided into a first cylindrical body 24 and a second cylindrical body 25, and the second cylindrical body 25 is disposed away from the first cylindrical body 24. Therefore, even if fluid seeps in through the gap between the core wire 17 and the first cylindrical body 24, the fluid is blocked between the stator molded portion 7 and the core wire 17, which are tightly adhered to each other, thereby preventing the fluid from seeping into the interior of the stator 3. This makes it possible to achieve both damage prevention for the coil 2 and ensuring waterproofing.

[0036] (2) The cylindrical body 23 is a heat-shrinkable tube. With this configuration, the cylindrical body 23, which is a heat-shrinkable tube, can be tightly attached to the core wire 17 by heat shrinking. This makes it difficult for a gap to form between the core wire 17 and the cylindrical body 23, which further contributes to preventing fluid intrusion.

[0037] (3) The core wire 17 has an insulating coating 18 baked onto its surface. The heat-shrinkable tube (cylinder 23) is made of a fluororesin. The stator molded portion 7 is made of an epoxy resin. With this configuration, the adhesive strength between the epoxy resin and the core wire 17 (insulating coating) during resin molding is stronger than the adhesive strength between the epoxy resin and the fluororesin during resin molding. This allows the stator molded portion 7 and the core wire 17 to be adhered sufficiently tightly, further contributing to preventing fluid from entering the interior of the stator 3.

[0038] (4) The stator 3 includes a busbar module 10 in which the busbar body 14 of the neutral busbar 11 is sealed with resin and is disposed between the coil ends of the coils 2 and the wiring section 19. The neutral busbar 11 is connected to the coils 2. The stator mold section 7 seals at least the busbar module 10 and the wiring section 19. With this configuration, the coils 2 and the busbar module 10 of the wiring section 19 are fixed by the stator mold section 7, making it difficult for them to become misaligned.

[0039] (5) At least one of the multiple coils 2 has a bent portion 27 formed by bending in the wiring portion 19. The first cylindrical body 24 is arranged so as not to cross the bent portion 27. With this configuration, the first cylindrical body 24 is arranged linearly along the core wire 17, making it difficult for gaps to occur in the first cylindrical body 24. This further contributes to suppressing fluid from entering the inside of the stator 3.

[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] 8, the first cylindrical body 24 may be disposed so as to cross at least a portion of the bent portion 27. With this configuration, the first cylindrical body 24 can be hooked onto the bent portion 27, making it difficult for the first cylindrical body 24 to come off.

[0042] The first cylindrical body 24 and the second cylindrical body 25 may be made of different materials. A plurality of second cylindrical bodies 25 may be provided. The portion where the cylindrical body 23 is omitted may be provided at any position on the coil 2.

[0043] The bent portion 27 is not limited to a 90-degree bend, and may be a bent shape of less than 90 degrees or more than 90 degrees. A single coil 2 may have a plurality of bent portions 27 formed therein.

[0044] The bent portion 27 may be omitted. The wiring portion 19 is not limited to being disposed on the upper surface (surface 21) of the busbar module 10, and may be disposed on, for example, the side surface or the back surface of the busbar module 10 as long as the wiring portion 19 is disposed along the path of the neutral point busbar 11.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The coil 2 is not limited to concentrated winding, but may be distributed winding. The set of the coil 2 and the neutral bus bar 11 is not limited to multiple systems, but may be a single system (one system).

[0049] The stator molded portion 7 only needs 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. The number of slots in the stator 3 is not limited to 24 and may be changed to another number, such as 12.

[0050] The number of poles of the rotor 4 may be set as needed. The motor 1 and the stator 3 are preferably mounted on an air mobility vehicle, for example. The motor 1 and the stator 3 may be mounted on a vehicle such as a passenger car, without being limited to an air mobility vehicle.

[0051] The motor 1 and the stator 3 are not limited to being mounted on mobility vehicles, but may also be mounted on various devices and apparatuses that require a rotary drive source. The expression "at least one" used in this disclosure means "one or more" of the desired options. As one example, the expression "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 expression "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.

[0052] 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.

[0053] Next, the technical ideas that can be understood from the above-described embodiment and modified examples will be described. [1] A stator (3) including a stator core (6) in which a rotor (4) is rotatably housed, a plurality of coils (2) arranged circumferentially around the stator core, and a stator molded portion (7) that seals at least some of the plurality of coils with resin, wherein at least one of the plurality of coils has a wiring portion (19) drawn out from the stator core and wired around the stator core to be connected to an external terminal (5), and an insulating cylindrical body (23) that houses a core wire (17) inside the wiring portion, the stator molded portion seals at least the wiring portion, and the cylindrical body has a first cylindrical body (24) having one end exposed from the stator molded portion and the other end embedded in the stator molded portion, and a second cylindrical body (25) arranged inside the stator molded portion and spaced apart from the first cylindrical body.

[0054] [2] The stator according to the above [1], wherein the cylindrical body is a heat-shrinkable tube. [3] The stator according to the above [2], wherein the core wire has an insulating coating (18) baked onto its surface, the heat-shrinkable tube is made of a fluorine-based resin, and the stator mold part is made of an epoxy resin.

[0055] [4] The stator according to any one of [1] to [3] above, further comprising a busbar module (10) in which a busbar body (14) of a neutral busbar (11) that is arranged between the coil ends of the plurality of coils and the wiring section and is connected to the plurality of coils is sealed with resin, and the stator mold section seals at least the busbar module and the wiring section.

[0056] [5] A stator described in any one of [1] to [4] above, wherein at least one of the plurality of coils has a bent portion (27) formed by bending in the routing portion, and the first cylindrical body is arranged so as not to cross the bent portion.

[0057] [6] A stator described in any one of [1] to [4] above, wherein at least one of the plurality of coils has a bent portion (27) formed by bending in the routing portion, and the first cylindrical body is arranged so as to cross at least a portion of the bent portion.

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 a stator molded portion (7) that seals at least a portion of the plurality of coils with resin, wherein at least one of the plurality of coils has an arrangement portion (19) that is drawn out from the stator core, arranged circumferentially around the stator core and connected to an external terminal (5); and an insulating cylinder (23) that houses a core wire (17) inside the arrangement portion, wherein the stator molded portion seals at least the arrangement portion, and the cylinder has: a first cylinder (24) having one end exposed from the stator molded portion and the other end embedded in the stator molded portion; and a second cylinder (25) that is arranged inside the stator molded portion and spaced apart from the first cylinder.

2. The stator of claim 1, wherein the cylindrical body is a heat shrink tube.

3. A stator as set forth in claim 2, wherein the core wire has an insulating coating (18) baked onto its surface, the heat shrink tube is made of a fluorine-based resin, and the stator molded portion is made of an epoxy resin.

4. A stator as described in claim 1, further comprising a busbar module (10) in which a busbar body (14) of a neutral busbar (11) connected to the plurality of coils is sealed with resin and disposed between the coil ends of the plurality of coils and the wiring section, and the stator mold section seals at least the busbar module and the wiring section.

5. A stator as described in claim 1, wherein at least one of the plurality of coils has a bent portion (27) formed by bending in the wiring portion, and the first cylindrical body is arranged so as not to cross the bent portion.

6. A stator as described in claim 1, wherein at least one of the plurality of coils has a bent portion (27) formed by bending in the wiring portion, and the first cylindrical body is disposed so as to traverse at least a portion of the bent portion.

7. 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 a stator molded portion (7) that seals at least a portion of the plurality of coils with resin, wherein at least one of the plurality of coils has an arrangement portion (19) that is drawn out from the stator core, arranged in the circumferential direction of the stator core and connected to an external terminal (5), and an insulating cylinder (23) that houses a core wire inside the arrangement portion, wherein the stator molded portion seals at least the arrangement portion, and wherein the cylinder has: a first cylinder (24) having one end exposed from the stator molded portion and the other end embedded in the stator molded portion, and a second cylinder (25) that is arranged inside the stator molded portion and spaced apart from the first cylinder.

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