Stator and motor

Abstract

To provide a stator and a motor which are easy to downsize and easy to increase cooling efficiency.SOLUTION: A stator 1 includes a stator core 2, a coil 3, a mold portion 4 that molds the stator core 2 and the coil 3, and a cover portion 5 attached to the mold portion 4. The stator core 2 has an annular yoke 21 that surrounds a shaft center 10 of a rotation shaft 90 of a rotor 9 and teeth 22 protruding from an inner circumferential surface of the yoke 21 toward the shaft center 10. The coil 3 is wound around the stator core 2. The mold portion 4 has a groove 41 whose inner space serves as a water passage 11. The cover portion 5 closes an opening 410 of the groove 41.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a stator and a motor, and more particularly to a stator including a stator core, a coil, and a molded portion that molds the stator core and the coil, and a motor including this stator. [Background technology]

[0002] Patent Document 1 describes a conventional rotating electric machine. This rotating electric machine includes a rotatably supported, generally cylindrical rotor, a stator, and a bracket that supports the stator. The bracket has a cooling water passage and a portion that comes into close contact with the stator coil via an insulator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2011 / 92928 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the rotating electric machine described in Patent Document 1, the cooling water channel is provided in the bracket, which increases the size of the bracket and therefore the motor, and the distance from the coil, which is the heat source, to the cooling water channel is long, resulting in low cooling efficiency.

[0005] An object of the present disclosure is to provide a stator and a motor that can be easily downsized and have improved cooling efficiency. [Means for solving the problem]

[0006] A stator according to one aspect of the present disclosure includes a stator core, a coil, a molded portion that molds the stator core and the coil, and a cover attached to the molded portion. The stator core has an annular yoke that surrounds the axis of a rotor's rotation shaft and teeth that protrude from the inner peripheral surface of the yoke toward the axis. The coil is wound around the stator core. The molded portion has a groove whose internal space serves as a waterway. The cover closes the opening of the groove.

[0007] A motor according to one aspect of the present disclosure includes the stator and a rotor facing the stator. [Effects of the Invention]

[0008] The stator and motor of the present disclosure can be easily downsized and can easily improve cooling efficiency. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a stator according to the first embodiment. [Figure 2] FIG. 2 is a perspective view of the stator with the cover removed. [Figure 3] FIG. 3 is a perspective view of a stator core in the stator of the same. [Figure 4] FIG. 4 is a plan view of a motor having the stator (with the cover removed from the stator). [Figure 5] FIG. 5 is a cross-sectional view of the stator core and coils of the same. [Figure 6] FIG. 6 is a cross-sectional view of a main part of the stator of the same. [Figure 7] FIG. 7 is a flowchart of a method for manufacturing the stator according to the embodiment. [Figure 8] FIG. 8 is a cross-sectional view of a main part of a stator according to the second embodiment. [Figure 9] FIG. 9 is a perspective view including a cutaway view of a main part of the stator. [Figure 10]FIG. 10 is a cross-sectional view of a main part of a stator according to a third embodiment. [Figure 11] FIG. 11 is a perspective view including a cutaway view of a main part of the stator. DETAILED DESCRIPTION OF THE INVENTION

[0010] (1) Overview A stator and a motor according to the present disclosure will be described. The embodiments described below are merely a part of various embodiments of the present disclosure, and various modifications can be made depending on the design and the like as long as the object of the present disclosure can be achieved in the following embodiments.

[0011] 1 to 3, a stator 1 according to the present disclosure includes a stator core 2, a coil 3, a molded portion 4 that molds the stator core 2 and the coil 3, and a cover portion 5 that is attached to the molded portion 4. The molded portion 4 has a groove 41 whose internal space serves as a water channel 11. The cover portion 5 closes an opening 410 of the groove.

[0012] Moreover, the motor 8 according to the present disclosure includes the stator 1 and a rotor 9.

[0013] The stator 1 and motor 8 described above can be easily downsized and the cooling efficiency can be easily increased.

[0014] (2) First embodiment The stator 1 includes a stator core 2, a coil 3, a molded portion 4, a cover portion 5, an insulator 6 (see FIG. 6), and a bus bar 7.

[0015] (2.1) Stator core As shown in FIG. 3, the stator core 2 has a yoke 21 and teeth 22. As shown in FIG. 4, the yoke 21 has an annular shape surrounding an axis 10 of a rotation shaft 90 of a rotor 9 that rotates relative to the stator 1. In this embodiment, the yoke 21 has an annular shape when viewed in a direction 100 in which the axis 10 extends (hereinafter referred to as the extension direction 100), and the center of the yoke 21 coincides with the axis 10 of the rotation shaft 90 of the rotor 9. The yoke 21 has a plurality of steel plates laminated in the extension direction 100. The steel plates are made of a magnetic material such as silicon steel plates. Here, fitting portions into which the teeth 22 are fitted are formed at the end of the yoke 21 on the axis 10 side (hereinafter referred to as the inner side). In this embodiment, the teeth 22 have 18 fitting portions formed at equal intervals in the circumferential direction of the inner end of the yoke 21.

[0016] 3, the teeth 22 protrude from the inner peripheral surface of the yoke 21 toward the axis 10. In this embodiment, 18 teeth 22 are provided on the stator core 2. The teeth 22 are molded separately from the yoke 21 and fitted into the yoke 21 to integrate the yoke 21 and the teeth 22. The teeth 22 have fitting portions formed therein that correspond to the fitting portions of the yoke 21, and the fitting portions of the teeth 22 are fitted into the fitting portions of the yoke 21, thereby attaching the teeth 22 to the yoke 21 as a single unit.

[0017] (2.2) Coil Conductive wire 30 constituting coil 3 is wound around teeth 22. This forms coil 3. In this embodiment, 18 coils 3 are provided on stator core 2. The cross-sectional shape of conductive wire 30 is rectangular. In particular, in this embodiment, coil 3 is a formed coil. The formed coil in this disclosure does not include a coil in which conductive wire of a constant width and thickness is simply wound spirally.

[0018] The formed coil is formed, for example, by preparing a plurality of rectangular plate materials of different lengths, widths, or thicknesses and joining these plate materials by cold welding, welding, or other methods. The plate materials are made of a so-called low-resistivity material such as copper or aluminum.

[0019] Alternatively, the formed coil may be formed by so-called casting, in which copper or the like is melted and poured into a mold. Furthermore, the formed coil may be formed by bending a plate-shaped conductor wire, which has been formed in advance so that its width and thickness vary along the way, at a predetermined position. Alternatively, the formed coil may be formed by rolling a plate-shaped conductor wire with a constant width and thickness at a predetermined position, changing the width or thickness along the way, and then winding the wire into a spiral shape. In short, the formed coil is formed by adding another process to winding the conductor wire, or by a method other than simple winding.

[0020] (2.3) Insulator As shown in FIG. 6 , the insulator 6 is interposed between the stator core 2 and the coil 3. The insulator 6 is made of an insulating material. The insulator 6 is divided into two halves in the extension direction 100, and is arranged so that each halve covers both end faces of the teeth 22 in the extension direction 100. The insulator 6 ensures an appropriate insulation distance between the stator core 2 and the coil 3.

[0021] (2.4) Busbar As shown in FIG. 3 , the busbar 7 is connected to the conductor 30. The busbar 7 makes it easier to pass a large current. The busbar 7 is electrically connected to the conductor 30 of the corresponding coil 3 to form connections for the U phase, V phase, and W phase. The busbar 7 is arranged on the opposite side of the coil 3 from the axis 10 (i.e., the outside). The busbar 7 is adjacent to the outside of the coil 3 in the inner / outer direction, with part of the molded portion 4 interposed between them. This makes it easier to prevent the size of the stator 1 from increasing in size in the extension direction 100.

[0022] In addition, bus bar 7 is disposed adjacent to yoke 21 in extension direction 100 with part of molded section 4 interposed therebetween.

[0023] The stator core 2, the coils 3, the insulators 6, and the bus bars 7 form a stator body 20.

[0024] (2.5) Mold section As shown in Fig. 6, the molded portion 4 molds the stator core 2, the coils 3, the insulators 6, and the bus bars 7. The molded portion 4 is made of resin. The molded portion 4 is formed in portions adjacent to both end faces of the stator core 2 in the extension direction 100 and in portions between adjacent teeth 22, 22. The portions of the molded portion 4 formed between adjacent teeth 22, 22 connect the portions adjacent to both end faces of the stator core 2 in the extension direction 100, forming an inseparable, integrated molded portion 4.

[0025] As shown in Figures 2 and 4, the molded section 4 has a groove 41 whose internal space serves as the water channel 11. As shown in Figure 6, the groove 41 (water channel 11) is formed in the molded section 4 at a position on one side of the extension direction 100 (the upper side in Figure 6) and on the opposite side of the stator core 2 from the coil 3. The groove 41 has an opening 410 that opens to one side of the extension direction 100 (the upper side in Figure 6).

[0026] As shown in Figures 2 and 4, the groove 41 (water passage 11) extends annularly around the axis 10. When viewed in the extension direction 100, the groove 41 (water passage 11) is formed in approximately the same shape as the stator core 2. A partition 12 is formed inside the groove 41 (water passage 11). The partition 12 divides the groove 41 in the circumferential direction. A first port 13 and a second port 14, which communicate with the outside, are formed on both circumferential sides of the partition 12 of the molded section 4. The first port 13 and the second port 14 are formed by holes that penetrate the outer wall of the groove 41 portion of the molded section 4. One of the first port 13 and the second port 14 serves as an inlet for water to enter the groove 41 (water passage 11), and the other serves as an outlet for water from the groove 41 (water passage 11).

[0027] (2.6) Cover As shown in FIGS. 1 and 6, the cover part 5 is attached to the molded part 4 and closes the opening 410 of the groove 41. The cover part 5 is made of resin. The cover part 5 is attached integrally to the molded part 4 by welding such as laser welding. By attaching the cover part 5 integrally to the molded part 4, a water channel 11 is formed inside the integrated resin part consisting of the molded part 4 and the cover part 5.

[0028] (2.7) Waterways As shown in Figure 6, the water channel 11 is adjacent to the coil 3 in the extension direction 100 via a part of the molded section 4. For convenience, in the extension direction 100, the side where the water channel 11 is formed as viewed from the stator core 2 is referred to as the upper side (upper side in Figure 6), and the opposite side is referred to as the lower side. The bottom surface (lower inner surface) of the water channel 11 is inclined so that it is positioned lower inward in the inner part. In addition, the coil end at the upper end in the extension direction 100 of the conductor 30 wound around the tooth 22 via the insulator 6 is also inclined at the same angle as the bottom surface of the water channel 11 so that it is positioned lower inward. A part of the molded section 4 is interposed between the bottom surface of the water channel 11 and the coil end of the conductor 30, with approximately the same thickness in the inner and outer directions.

[0029] In this embodiment, the cross-sectional shape of the conductor 30 is rectangular, and therefore, compared to when a conductor 30 with a circular cross-section is used, there is less variation in the outer diameter when it is wound around the teeth 22 via the insulator 6, and the thickness margin of the molded portion 4 can be reduced.

[0030] (2.8) Motor, rotor The motor 8 includes a stator 1 and a rotor 9. The rotor 9 has a rotating shaft 90 and rotates around an axis 10 of the rotating shaft 90. In the motor 8, magnetic flux generated from a plurality of coils 3 (18 coils in FIG. 1) in the stator 1 generates an electromagnetic force that rotates the rotor 9.

[0031] The rotor 9 has a cylindrical rotor core 91, a plurality of magnets 92, and a rotating shaft 90. The rotating shaft 90 is held inside the rotor core 91. The magnets 92 are arranged in a polygonal shape.

[0032] (2.9) Stator manufacturing method As shown in FIG. 7, the steps in the method for manufacturing the stator 1 are divided into a first step (S1) to a fourth step (S4).

[0033] In the first step (S1), the stator core 2, the coils 3, and the insulators 6 are assembled. The stator core 2 is formed by fitting the teeth 22 into the yoke 21. The insulators 6 are combined with the stator core 2, and the coils 3 are wound around the teeth 22 with the insulators 6 interposed therebetween. Next, the process moves to the second step (S2).

[0034] In the second step (S2), the stator body 20 is assembled. That is, the busbars 7 are combined with the stator core 2, coils 3, and insulators 6 assembled in the first step (S1). As shown in FIG. 3, multiple busbars 7 are stacked in the extension direction 100, but they must not contact each other. A jig functioning as a spacer is interposed between the multiple busbars 7, and the busbars 7 are arranged so that they do not contact each other. Next, the conductors 30 of the coils 3 are connected to the corresponding busbars 7 by welding. Note that the end of the conductors 30 to be welded to the busbars 7 protrudes in one direction (upward) in the extension direction 100 more than the other parts of the coils 3, and the end of the busbars 7 is welded to this protruding portion. When the welding is completed, the jig is removed, and the assembly of the stator body 20 is completed. Next, the third step (S3) is performed.

[0035] In the third step (S3), the molded portion 4 is formed in the stator body 20. The formation of the molded portion 4 is completed by placing the stator body 20 in a predetermined mold, pouring molten resin into the mold, and cooling the resin to solidify. Next, the process moves to the fourth step (S4).

[0036] In a fourth step (S4), the cover portion 5 is attached to the molded portion 4 formed in the stator body 20. The cover portion 5 is attached integrally to the portion of the molded portion 4 along the opening 410 by laser welding.

[0037] The first step (S1) to the fourth step (S4) result in the completed stator 1.

[0038] (2.10) Effect The stator 1 described above includes a molded section 4 that molds the stator core 2 and the coil 3. The molded section 4 has a groove 41. The opening 410 of the groove 41 is blocked by the cover section 5, and a water channel 11 is formed in the resin section. This allows the water channel 11 to be formed near the stator main body 20 (inside the stator core 2), eliminating the need for a cooling mechanism on a bracket or the like to mount the stator, as in the past, and facilitating the miniaturization of the member to which the motor 8 is mounted. Furthermore, because the water channel 11 is formed in the molded section 4 near the stator main body 20, the water channel 11 can be provided in close proximity to the coil 3, which is a heat source, making it easier to improve the cooling efficiency of the coil 3. Furthermore, because the resin of the molded section 4 is filled between the conductors 30 of the coil 3 and between the conductors 30 and the water channel 11, insulation due to voids is suppressed, which also makes it easier to improve the cooling efficiency of the coil 3. Furthermore, because the water channel 11 can be provided in close proximity to the coil 3, it also makes it easier to miniaturize the stator 1 (motor 8) itself.

[0039] Furthermore, because the cross section of the conductor 30 is rectangular, it is possible to reduce the thickness margin of the molded portion 4, as described above. As a result, the distance between the bottom surface of the water channel 11 and the coil end of the conductor 30 can be shortened, which makes it easier to further improve the cooling performance of the coil 3.

[0040] Furthermore, the water channel 11 is adjacent to the coil 3 in the extension direction 100 via a part of the molded section 4. This makes it easy to form the water channel 11 by utilizing dead space, and forming the water channel 11 does not increase the size of the stator 1. In this embodiment, the end of the conductor 30 that is welded to the bus bar 7 protrudes in one direction (upward) in the extension direction 100 more than other parts of the coil 3, and although dead space was originally formed in this part, the water channel 11 is formed by making good use of this dead space, thereby preventing the stator 1 and the motor 8 from becoming larger.

[0041] (3) Second embodiment The stator 1 according to the second embodiment will be described below with reference to Figures 8 and 9. Note that the stator 1 according to the second embodiment is mostly the same as the stator 1 according to the first embodiment, and therefore the same reference numerals are used for the overlapping components, and detailed descriptions thereof will be incorporated herein.

[0042] In the first embodiment, the upper coil end in the extension direction 100 of the conductor 30 wound around the tooth 22 via the insulator 6 is inclined so that it is positioned lower as it goes inward, and the protrusion amount in the extension direction 100 of the first coil end 31 of the coil 3, which is positioned closest to the axis 10, is smaller than the protrusion amount of the second coil end 32, which is positioned differently and closest to the axis 10.

[0043] In contrast, in the second embodiment, the amount of protrusion of the first coil end 31 in the extension direction 100 is greater than the amount of protrusion of the second coil end 32 in the extension direction 100. In particular, the amount of protrusion of the first coil end 31 in the extension direction 100 is greater than the amount of protrusion of all of the second coil ends 32 in the extension direction 100.

[0044] The amount of heat generated in the conductor 30 of the coil 3 is greater towards the inner conductor 30. Therefore, by making the first coil end 31 protrude further than the second coil end 32, the first coil end 31 can be more easily cooled by the water flowing through the water passage 11, which makes it easier to improve the cooling efficiency of the coil 3.

[0045] (4) Third embodiment The stator 1 according to the third embodiment will be described below with reference to Fig. 10 and Fig. 11. Note that the stator 1 according to the third embodiment is mostly the same as the stator 1 according to the first embodiment, and therefore the same reference numerals are used for the overlapping components, and detailed descriptions thereof will be cited.

[0046] In the third embodiment, the water channel 11 is adjacent to the coil 3 through a part of the molded section 4 in the stretching direction 100, and also adjacent to the coil 3 on the outside through a part of the molded section 4.

[0047] The water channel 11 has a first portion 110 similar to the water channel 11 of the first embodiment, and a second portion 111 consisting of an additional groove formed in the bottom surface of the water channel 11. This allows the water channel 11 to be formed even closer to the coil 3, making it easier to improve the cooling efficiency of the coil 3.

[0048] (5) Variations Next, modifications of the first to third embodiments will be listed. The following modifications may be realized in appropriate combination.

[0049] The shape of the yoke 21 as viewed in the extension direction 100 does not have to be annular and is not limited thereto.

[0050] The number of teeth 22 and coils 3 formed on the stator core 2 is not limited.

[0051] The cross-sectional shape of the conductive wire 30 is not limited to a square shape, and may be a circle.

[0052] The insulator 6 is an optional component in the present disclosure and does not necessarily have to be provided on the stator 1 .

[0053] The busbar 7 does not have to be arranged adjacent to the outside of the coil 3 via a part of the molded portion 4 in the inward / outward direction. Furthermore, the busbar 7 does not have to be arranged adjacent to the yoke 21 via a part of the molded portion 4 in the extension direction 100. The busbar 7 is an optional configuration in the present disclosure and does not have to be provided in the stator 1. If the busbar 7 is not provided, a conductor may be connected to the conductor 30 of the coil 3 in the stator 1 instead of the busbar 7.

[0054] The stator body 20 does not necessarily have to include the stator core 2, the coils 3, the insulators 6, and the bus bars 7, but only needs to include at least the stator core 2 and the coils 3. In other words, the insulators 6 and the bus bars 7 are optional components, and they do not necessarily have to be included in the stator body 20.

[0055] The molded section 4 is only required to mold at least the stator core 2 and the coils 3, and it is not necessary to mold either or both of the insulators 6 and the bus bars 7.

[0056] The molded portion 4 does not have to be formed in the portions adjacent to both end faces of the stator core 2 in the extension direction 100 and the portions between adjacent teeth 22, 22. For example, the molded portion 4 may be formed so as to cover the entire stator core 2.

[0057] The cover portion 5 may be attached to the molded portion 4 by a method other than welding. In the above description, the cover portion 5 is formed from a resin. However, other materials, such as a metal material with high thermal conductivity, may be used for the cover portion 5. In this case, a groove 41 and molded portion 4 made of resin are present between the cover portion 5 made of a metal material and the stator core 2 or the coil 3. Therefore, the cover portion 5 does not come into direct contact with the stator core 2 or the coil 3, and therefore, insulation is not required for the cover portion 5. Therefore, generally, when the cover portion 5 is formed from a metal material with higher thermal conductivity than a resin material, high heat dissipation performance can be expected.

[0058] The material flowing through the water channel 11 is not limited to water, but may be any liquid.

[0059] (6) Summary As is clear from the above-described embodiment and its modified examples, a stator (1) of a first aspect includes a stator core (2), a coil (3), a molded portion (4) that molds the stator core (2) and the coil (3), and a cover portion (5) attached to the molded portion (4). The stator core (2) has an annular yoke (21) that surrounds an axis (10) of a rotating shaft (90) of a rotor (9) and teeth (22) that protrude from the inner peripheral surface of the yoke (21) toward the axis (10). The coil (3) is wound around the stator core (2). The molded portion (4) has a groove (41) whose internal space serves as a water channel (11). The cover portion (5) closes an opening (410) of the groove (41).

[0060] According to the first aspect, since the water channels (11) are formed in the molded portion (4), the water channels (11) can be provided in proximity to the coil (3), which is a heat source, and the cooling efficiency of the coil (3) can be improved. Furthermore, since the resin of the molded portion (4) is filled between the conductors (30) of the coil (3) and between the conductors (30) and the water channels (11), heat insulation due to gaps is suppressed, and in this respect, the cooling efficiency of the coil (3) can also be improved. Furthermore, since the water channels (11) can be provided in proximity to the coil (3), the stator (1) can be made more compact.

[0061] The second aspect can be realized by combining the first aspect. In the second aspect, the stator (1) further includes an insulator (6) interposed between the stator core (2) and the coil (3). The insulator (6) is molded together with the stator core (2) and the coil (3) by the molded portion (4).

[0062] According to the second aspect, the insulator (6) can ensure an appropriate insulation distance between the stator core (2) and the coil (3).

[0063] The third aspect can be realized by combining the first or second aspect. In the third aspect, the stator 1 further includes a bus bar 7 connected to the conductor 30 constituting the coil 3. The bus bar 7 is molded together with the stator core 2 and the coil 3 by the molded portion 4.

[0064] According to the third aspect, the bus bar (7) makes it easier to pass a large current.

[0065] The fourth aspect can be realized by combining any one of the first to third aspects. In the fourth aspect, the conductor wire 30 is wound around the teeth 22. The bus bar 7 is disposed on the side opposite to the axis 10 of the coil 3.

[0066] According to the fourth aspect, it is easy to prevent the size of the stator (1) in the direction (100) in which the axis (10) extends.

[0067] The fifth aspect can be realized by combining with any one of the first to fourth aspects. In the fourth aspect, the cross section of the conducting wire (30) constituting the coil (3) is rectangular.

[0068] According to the fifth aspect, the thickness margin of the molded portion (4) can be reduced, and the distance between the bottom surface of the water channel (11) and the coil end of the conductor (30) can be shortened, which makes it easier to further improve the cooling performance of the coil (3).

[0069] The sixth aspect can be realized in combination with the fifth aspect. In the sixth aspect, the coil (3) is a formed coil.

[0070] According to the sixth aspect, when the conductor (30) is wound around the teeth (22), the conductor (30) has a circular cross section, which makes it easy to wind the conductor (30) around the teeth (22).

[0071] The seventh aspect can be realized by combining with any of the first to sixth aspects. The water channel (11) of the seventh aspect is adjacent to the coil (3) via a part of the molded portion (4) in the direction (100) in which the axis (10) extends.

[0072] According to the seventh aspect, the water channel (11) can be easily formed by utilizing dead space, and even if the water channel (11) is formed, it is difficult for it to become large.

[0073] The eighth aspect can be realized by combining the seventh aspect. In the eighth aspect, the water channel (11) is adjacent to the coil (3) via a part of the molded portion (4) on the side opposite to the axis (10).

[0074] According to the eighth aspect, the water passage (11) can be formed even closer to the coil (3), which makes it easier to improve the cooling efficiency of the coil (3).

[0075] The ninth aspect can be realized by combining with any one of the first to eighth aspects. In the ninth aspect, the first coil end (31) of the coil (3) that is located closest to the axis (10) in the direction in which the axis (10) extends protrudes in the direction in which the axis (10) extends further than the second coil end (32) that is located at a position different from the closest to the axis (10) and in the direction in which the axis (10) extends.

[0076] According to the ninth aspect, the first coil end (31) can be easily cooled by the water flowing through the water passage (11), and the cooling efficiency of the coil (3) can be easily improved.

[0077] The tenth aspect can be realized by combining with the ninth aspect. In the tenth aspect, the first coil end (31) protrudes in the direction in which the axis (10) extends beyond all of the second coil ends (32).

[0078] According to the tenth aspect, the first coil end (31) can be easily cooled by the water flowing through the water passage (11), and the cooling efficiency of the coil (3) can be further improved.

[0079] The eleventh aspect can be realized by combining with any one of the first to tenth aspects. In the eleventh aspect, a motor (8) includes the stator (1) of any one of the first to tenth aspects and a rotor (9) facing the stator (1).

[0080] According to the eleventh aspect, since the water channel (11) is formed in the molded portion (4), the water channel (11) can be provided in proximity to the coil (3), which is a heat source, and the cooling efficiency of the coil (3) can be improved. In addition, since the resin of the molded portion (4) is filled between the conductors (30) of the coil (3) and between the conductors (30) and the water channel (11), heat insulation due to gaps is suppressed, and in this respect, the cooling efficiency of the coil (3) can also be improved. In addition, since the water channel (11) can be provided in proximity to the coil (3), the motor (8) can be made more compact. [Explanation of symbols]

[0081] 1 stator 10 axis center 100 Stretching direction 11 Waterways 2 stator core 21 York 22 Teeth 3 coils 30 conductor 31 First coil end 32 Second coil end 4 Mold section 41 Groove 410 Aperture 5 Cover 6 Insulator 7 Busbar

Claims

1. an annular yoke surrounding the axis of the rotor shaft; teeth protruding from an inner peripheral surface of the yoke toward the axis; a stator core having a coil wound around the stator core; a molding section that molds the stator core and the coil; a cover portion attached to the mold portion, the molded portion has a groove whose internal space serves as a water channel; The cover closes the opening of the groove. Stator.

2. The rotor further includes an insulator interposed between the stator core and the coil, The insulator is molded together with the stator core and the coil by the molded portion. The stator according to claim 1 .

3. Further, a bus bar is provided which is connected to the conductor wire constituting the coil, the bus bar is molded together with the stator core and the coil by the molded portion; 3. A stator according to claim 1 or 2.

4. The conducting wire is wound around the teeth, The bus bar is disposed on the opposite side of the coil from the axial center side. The stator according to claim 3 .

5. The cross section of the conductor constituting the coil is rectangular.

3. A stator according to claim 1 or 2.

6. The coil is a formed coil.

6. The stator according to claim 5.

7. The water channel is adjacent to the coil through a part of the molded portion in the direction in which the axis extends. The stator according to claim 1 .

8. The water channel is adjacent to the coil via a part of the molded portion on the side opposite to the axial center side.

8. The stator according to claim 7.

9. a first coil end of the coil that is located closest to the axis and in the direction in which the axis extends protrudes in the direction in which the axis extends further than a second coil end that is located at a position different from the closest to the axis and in the direction in which the axis extends; 8. A stator according to claim 1 or 7.

10. The first coil end protrudes in the direction in which the axis extends beyond all of the second coil ends.

10. The stator of claim 9.

11. The stator according to claim 1 or 2; a rotor facing the stator, Motor.

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