Stator, and resin seal method in stator slot

Abstract

To provide a stator capable of easily sealing both ends of a stator slot, in which a coil is disposed, in an axial direction.SOLUTION: A stator 100 comprises: a foaming material 30 which seals both end sides of a stator slot 11 in an axial direction by foaming; and a high heat conductive resin 40 filling the inside of the stator slot 11, of which both the end sides in the axial direction are sealed by the foaming material, and having heat conductivity higher than that of the foaming material 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a stator and a method for sealing the inside of a stator slot with resin. [Background technology]

[0002] 2. Description of the Related Art A stator is known from the past (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a stator for an electric motor, which includes a stator core provided with slots extending in the axial direction, an insulating material provided integrally with the inner surface of the slot, a coil accommodated in the slot and facing an insulating resin layer, and a filling and fixing portion sealed in the gap between the coil. In Patent Document 1, the coil accommodated in the slot is surrounded by the insulating layer provided in the slot when viewed from the axial direction. In Patent Document 1, the stator core is placed inside a mold, and an insulating resin is filled into the inner surface of the slot in which the coil is accommodated by insert molding to form an insulating resin layer. In Patent Document 1, after the insulating resin layer is formed, the coil is inserted and a filling material that forms the filling and fixing portion is filled. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-134677 A Summary of the Invention [Problem to be solved by the invention]

[0005] Although it is not specified in the above Patent Document 1, it is considered that the filler material is filled from the axial direction into the slot into which the coil is inserted, with the circumferential opening sealed with an insulating resin layer. In this case, it is considered necessary to seal the axial end of the slot with a mold so that the filler material does not flow out of the slot. However, since the coil protrudes from both ends of the stator core in the axial direction, it is necessary to design and attach a mold according to the shape of the coil, which is time-consuming. Therefore, it is desired to easily seal the slot in which the coil is arranged.

[0006] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a stator that can easily seal both axial ends of the stator slot in which a coil is arranged, and a method of resin sealing inside the stator slot. [Means for solving the problem]

[0007] In order to achieve the above object, a stator in a first aspect of the present invention comprises a stator core including a stator slot in which a coil is arranged, a foam material that is arranged on both axial ends of the stator slot and seals both axial ends of the stator slot by foaming, and a resin filled inside the stator slot whose both axial ends are sealed by the foam material.

[0008] As described above, the stator according to the first aspect of the present invention includes a foaming material that seals both axial end sides of the stator slot by foaming, and a resin that is filled inside the stator slot whose both axial end sides are sealed by the foaming material. As a result, both axial end sides of the stator slot can be sealed by foaming the foaming material, so there is no need to attach a mold for sealing both axial end sides of the stator slot to the stator core, and there is no need to separately prepare a mold that matches the shape of the coil. As a result, both axial end sides of the stator slot in which the coil is arranged can be easily sealed. In addition, by providing a resin that is filled inside the stator slot, it is possible to prevent the coil from coming into contact with the stator when the coil is inserted into the stator slot, and the coil can be fixed in the stator slot.

[0009] In the stator according to the first aspect described above, the resin preferably includes a high thermal conductivity resin having a higher thermal conductivity than the foam material, and the length of the resin in the axial direction of the stator slot is greater than the length of the foam material in the axial direction of the stator slot.

[0010] With this configuration, the resin contains a highly thermally conductive resin, which improves the heat dissipation of the stator core, and the heat generated from the coil arranged in the stator slot can be efficiently dissipated. In addition, the length of the highly thermally conductive resin in the axial direction of the stator slot can be increased, which increases the surface area of ​​the highly thermally conductive resin in contact with the coil. As a result, the area of ​​the highly thermally conductive resin in contact with the coil can be increased, which allows the heat generated from the coil to be effectively discharged to the outside.

[0011] In the aforementioned stator according to the first aspect, the foam material is preferably made of insulating slotted paper, and the resin is preferably made of insulating resin.

[0012] With this configuration, since the foam material and resin have insulating properties, by placing the foam material and resin between the stator core and the coil, insulation between the stator core and the coil can be ensured.

[0013] The method for sealing a stator slot with resin according to the above-mentioned second aspect includes a step of placing a foaming material on both axial end sides of the stator slot of a stator core including a coil and foaming it to seal both axial end sides of the stator slot, and after foaming the foaming material, filling resin into the inside of the stator slot whose both axial end sides have been sealed with the foaming material.

[0014] In the method for resin sealing in a stator slot according to the second aspect of the present invention, as described above, the method includes a step of foaming the foaming material, and then filling the inside of the stator slot, the axial end sides of which are sealed with the foaming material, with a highly thermally conductive resin having a higher thermal conductivity than the foaming material. As a result, the highly thermally conductive resin is filled in a state in which the axial end sides of the stator slot are sealed with the foaming material, so that it is possible to prevent the highly thermally conductive resin from leaking out of the stator slot in the axial direction. Furthermore, by filling the inside of the stator slot with resin, it is possible to prevent the coil from contacting the stator slot when a coil is inserted into the stator slot, and it is possible to fix the coil in the stator slot. Furthermore, by including a step of disposing a foaming material on both axial end sides of the stator slot of a stator core including a coil, and foaming the foaming material to seal both axial end sides of the stator slot, it is possible to seal both axial end sides of the stator slot by foaming the foaming material without disposing a mold on both axial end sides of the stator core, so that it is not necessary to perform a step of attaching a mold for sealing both end sides of the stator slot. As a result, it is possible to provide a resin sealing method that can easily seal both axial ends of a stator slot in which a coil is disposed.

[0015] In the stator according to the above aspect, the following configuration is also possible.

[0016] (Additional note 1) In the stator according to the first aspect described above, when viewed in the axial direction, the foam material has an annular portion that surrounds the coil within the stator slot.

[0017] With this configuration, the coil can be surrounded by the annular portion of the foam material, so that insulation between the stator core and the coil can be reliably ensured.

[0018] (Additional note 2) In the stator according to the first aspect described above, the foam material in the stator slot is disposed at a predetermined distance in the radial direction on the outer circumferential side from the end face on the inner circumferential side of the stator slot.

[0019] With this configuration, a gap can be formed between the end face on the inner circumference side of the stator slot and the foaming material, so that while the foaming material is in a foamed state, resin can be filled from one side in the axial direction to the other side, making it easier to fill the resin. [Brief description of the drawings]

[0020] [Figure 1] 1 is a plan view of a rotating electric machine according to an embodiment; [Diagram 2] FIG. 2 is a perspective view of a stator core according to an embodiment. [Diagram 3] FIG. 4 is a cross-sectional view of the stator core taken along the Z direction. [Figure 4] 4 is a cross-sectional view taken along line IV-IV in FIG. 3, where (A) shows the foam before the foaming material is foamed, and (B) shows the foam after the foaming material is foamed. [Diagram 5] 4 is a cross-sectional view taken along line VV in FIG. 3, where (A) shows before filling with highly thermally conductive resin and (B) shows after filling with highly thermally conductive resin. [Figure 6] FIG. 13 is a diagram showing an example of protective slot paper. [Figure 7] FIG. 4 is a perspective view showing a state in which a die is placed on a stator. [Figure 8] FIG. 2 is a diagram illustrating an example of a gate. [Figure 9] 13A and 13B are diagrams illustrating an example of protective slot paper in a modified example. [Figure 10] FIG. 11 is a side view showing a state in which a die according to a modified example is placed on a stator. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0022] The structure of a rotating electrical machine 200 including a stator 100 according to this embodiment will be described with reference to FIGS.

[0023] As shown in FIG. 1, in this specification, the term "axial direction" refers to a direction (Z direction) along the rotation axis (symbol O) of the stator core 10 (rotor 150). One side of the axial direction is the Z1 direction side, and the other side is the Z2 direction side. The term "circumferential direction" refers to a direction perpendicular to the Z direction, and refers to the circumferential direction (A direction) of the stator core 10. One side of the circumferential direction is the A1 direction, and the other side is the A2 direction. The term "radial direction" refers to a direction perpendicular to the Z direction, and refers to a radial direction (B direction) based on the rotation axis of the stator core 10 (rotor 150). The term "radial inner side" refers to a direction toward the center of the stator core 10 (B1 direction). The term "radial outer side" refers to a direction toward the outside of the stator core 10 (B2 direction).

[0024] As shown in Fig. 1, the rotating electric machine 200 includes a stator 100 and a rotor 150. The stator 100 is formed in an annular shape. The stator 100 and the rotor 150 face each other. The rotor 150 is disposed radially inside (on the B1 direction side) of the stator 100. The rotor 150 is provided with a plurality of permanent magnets (not shown). That is, the rotating electric machine 200 of this embodiment is configured as an inner rotor type rotating electric machine.

[0025] (Stator configuration) The stator 100 includes a stator core 10 and a coil 20. The stator core 10 is disposed so as to face the rotor 150 at a predetermined interval in the radial direction. The stator core 10 is provided with a plurality of stator slots 11. Teeth 12 are provided between adjacent stator slots 11. The stator core 10 is formed, for example, by stacking a plurality of electromagnetic steel plates in the direction of the central axis of rotation (Z1 direction and Z2 direction), and is configured to be able to pass magnetic flux. The stator core 10 has end faces 10a on both one side (Z1 direction side) and the other side (Z2 direction side) in the axial direction. The stator 100 also includes a coil 20.

[0026] 2, the coil 20 is connected to an external power supply unit and configured to receive power (e.g., three-phase AC power). The coil 20 is configured to generate a magnetic field when power is supplied. The coil 20 includes a U-phase coil, a V-phase coil, and a W-phase coil through which three-phase (U-phase, V-phase, and W-phase) AC currents flow.

[0027] As shown in Fig. 2, the coil 20 is disposed in each of the multiple stator slots 11, and the conductor wire is wave-wound. Specifically, the coil 20 includes a slot-received portion 21 and a coil end portion 22. The slot-received portion 21 is received in each of the multiple stator slots 11 formed to extend in the axial direction (Z direction). The coil end portion 22 connects the multiple slot-received portions 21 in pairs. Specifically, the coil end portion 22 connects the slot-received portions 21 received in different stator slots 11. That is, the coil 20 arranged in the stator core 10 is arranged in one stator slot 11 from one side in the axial direction to the other side (from the Z1 direction to the Z2 direction) in a portion corresponding to one slot-accommodated portion 21, then in a portion corresponding to a coil end portion 22 on the Z2 direction side, it is arranged in another stator slot 11 different from the one stator slot 11 from the other side in the axial direction to one side (from the Z2 direction to the Z1 direction) in a portion corresponding to another slot-accommodated portion 21. The coil 20 is also formed so as to cross from the slot-accommodated portion 21 along the end face 10a on the Z1 direction side, and is further connected to the slot-accommodated portion 21 at another different stator slot 11. The coil 20 is formed by wave-winding a conductor member that is a rectangular conductor wire.

[0028] 3, the stator 100 includes a foam material 30 and a highly thermally conductive resin 40. Specifically, in the stator slots 11 of the stator 100, the foam material 30 on the Z1 side, the highly thermally conductive resin 40, and the foam material 30 on the Z2 side are arranged along the axial direction. Also, the foam material 30 and the highly thermally conductive resin 40 are arranged in each of the multiple stator slots 11. The highly thermally conductive resin 40 is an example of the "resin" described in the claims.

[0029] As shown in FIG. 3, the foam material 30 is disposed on both ends of the stator slot 11 in the axial direction (the end 11c on the Z1 side and the end 11c on the Z2 side). The foam material 30 is made of insulating slot paper. In detail, the foam material 30 has a foam adhesive layer laminated on both sides of the slot paper, and the foam adhesive layer foams and expands when heated. As a result, the gap between the stator slot 11 and the foam material 30 is sealed except for a part, and both ends of the stator slot 11 in the axial direction are sealed. The slot paper is flat and is disposed in the stator slot 11 in the axial direction in a ring-wound state. The foam material 30 can be attached to the coil 20 by the foam adhesive layer. In this embodiment, as an example, the foam material 30 is provided on both ends 11c of the stator slot 11 in the axial direction. In this embodiment, as an example, the both ends of the foam material 30 are located at the same positions as both ends of the stator slot 11 in the axial direction in the axial direction.

[0030] As shown in FIG. 4(A), the foaming material 30 has an annular portion 30a when viewed from the axial direction. The annular portion 30a is disposed at a distance from the inner peripheral surface of the stator slot 11 in the circumferential and radial directions. The annular portion 30a is disposed so as to surround the coil 20 in the stator slot 11. The coil 20 is inserted into the annular portion 30a of the foaming material 30. The foaming material 30 in the stator slot 11 is disposed at a predetermined distance from the end face 10a on the inner peripheral side of the stator slot 11 on the outer peripheral side (B2 side) in the radial direction. By being separated by a predetermined distance, a filling port 11b for filling the high thermal conductive resin 40 is formed along the axial direction. As shown in FIG. 4(B), the gap between the foaming material 30 and the inner peripheral surface of the stator slot 11 is filled by foaming the foaming material 30, but a filling port 11b is formed between the end face 11a on the inner peripheral side of the stator slot 11. Although FIG. 4 shows a semi-open type stator core 10, the same applies to either an open type stator core 10 or a closed type stator core 10.

[0031] As shown in Fig. 3, the highly thermally conductive resin 40 is arranged so as to be sandwiched between the foam materials 30 arranged on both end sides in the axial direction. The highly thermally conductive resin 40 is a resin having a higher thermal conductivity than the foam material 30. The highly thermally conductive resin 40 has insulating properties. The highly thermally conductive resin 40 is provided to fix the coil 20 and ensure insulation between the coil 20 and the stator core 10.

[0032] The thermal conductivity of the highly thermally conductive resin 40 is 0.8 or more, and more preferably 1.0 or more. The highly thermally conductive resin 40 includes, for example, an epoxy resin or a urethane acrylate. The length of the highly thermally conductive resin 40 in the axial direction of the stator slot 11 is greater than the length of the foam material 30 in the axial direction of the stator slot 11. Specifically, the length of the highly thermally conductive resin 40 relative to the axial length of the stator slot 11 is, for example, 70% or more and 90% or less, and the length of the foam material 30 is 10% or more and 30% or less in total between the end 11c on one side and the end 11c on the other side.

[0033] As shown in FIG. 5, the stator core 10 includes a protective slot paper 50. The protective slot paper 50 is a slot paper that does not have foaming properties and is different from the foam material 30. The material of the protective slot paper 50 is, for example, PPS (polyphenylene sulfide) resin. The protective slot paper 50 surrounds the coil 20. In detail, the protective slot paper 50 has an annular portion, and the coil 20 is arranged in the annular portion of the protective slot paper 50. The protective slot paper 50 prevents the coil 20 from contacting the stator core 10. As shown in FIG. 5(A), the protective slot paper 50 is arranged at a distance from the inner peripheral surface of the stator core 10 in the circumferential direction and the radial direction. As shown in FIG. 5(B), a high thermal conductive resin 40 is filled in the gap between the protective slot paper 50 and the inner peripheral surface of the stator core 10.

[0034] As shown in Fig. 6, the protective slot paper 50 has a mesh. The size of the mesh is a size that allows the filled highly thermally conductive resin 40 to enter, and is 75 µm or more. When the filled highly thermally conductive resin 40 enters the mesh of the protective slot paper 50, the voids in the stator slot 11 are easily filled, improving heat dissipation. Note that Fig. 6 shows the protective slot paper 50 in an unfolded state. The protective slot paper 50 is wound into a ring and placed in the stator slot 11.

[0035] The protective slot paper 50 is arranged toward the center in the axial direction so as not to overlap with the foam material 30 in the axial direction. The protective slot paper 50 is arranged in the axial direction at approximately the same position as the highly thermally conductive resin 40 in FIG. 3. In detail, the highly thermally conductive resin 40 is arranged so as to surround the periphery of the protective slot paper 50. The ratio of the length of the foam material 30 to the length of the protective slot paper 50 in the axial direction is approximately the same as the ratio of the foam material 30 to the highly thermally conductive resin 40. The highly thermally conductive resin 40 is arranged so as to surround the protective slot paper 50. The protective slot paper 50 is arranged so as to be surrounded by the foam material 30 when viewed from the axial direction. In other words, the protective slot paper 50 is arranged at a position closer to the coil 20 than the foam material 30 in the circumferential and radial directions.

[0036] (Method of sealing the inside of stator slot 11 with resin) A method for resin sealing inside the stator slot 11 will be described. First, as shown in Fig. 4(A), a process is performed in which annular foam material 30 is placed near both axial ends (ends 11c on the Z1 and Z2 sides) of the stator slot 11. In this process, the foam material 30 is formed into an annular shape and then placed on the Z1 and Z2 sides of the stator slot 11. The foam material 30 is attached to the coil 20 by a foam adhesive layer of the foam material 30.

[0037] 5A, a process is performed in which an annular protective slot paper 50 is inserted near the center of the stator slot 11 in the axial direction. The protective slot paper 50 is wound in an annular shape and then placed in the stator slot 11.

[0038] Next, a step of inserting the coil 20 is performed. The coil 20 is formed into a predetermined shape in advance and then inserted into the stator slot 11. The coil 20 is inserted into the annular portion so as to be surrounded by the annular protective slot paper 50 and the annular foam material 30. After the coil 20 is inserted, the shape of the coil 20 may be adjusted.

[0039] Next, as shown in Fig. 4(B), a process of sealing both axial end sides of the stator slot 11 is performed. In detail, the foaming material 30 arranged on both axial end sides of the stator slot 11 of the stator core 10 including the coil 20 is foamed to seal both axial end sides of the stator slot 11. The foaming of the foaming material 30 is performed by heating. As a result, both axial end sides of the stator slot 11 are sealed with almost no gaps except for the filling port 11b for pouring the high thermal conductive resin 40.

[0040] Next, as shown in FIG. 7, a step of attaching a mold 60 to the end 11c of the stator core 10 in the axial direction is performed. The mold 60 is, for example, a mold 60 that can be divided into a plurality of parts, and is attached so as to surround the coil 20 by sliding the parts radially inward of the stator core 10. The number of parts of the mold 60 may be two or four. In addition, while the mold 60 is shown in a rectangular shape in FIG. 7, the mold 60 is not limited to this, and may be a circular shape. In FIG. 7, the mold 60 is shown attached to the end 11c of the Z1 side of the stator core 10, but the mold 60 may be attached to the end 11c of the Z2 side as well as the end on the Z1 side. The end of the stator 100 in the axial direction may be at the same position as the end 11c of the stator slot 11, or may be at a position away from the end 11c of the stator slot 11 by a distance that the coil 20 protrudes. In addition, a mold for sealing the inner peripheral surface of the stator core 10 is also attached to the stator core 10.

[0041] Next, a process of filling the stator slot 11 with the highly thermally conductive resin 40 is performed. As shown in FIG. 8, a gate 70 is arranged inside the mold 60. The gate 70 fills the stator slot 11, both axial end sides of which are sealed with the foam material 30, with the highly thermally conductive resin 40 from one axial end 11c. The gate 70 includes an injection section into which the highly thermally conductive resin 40 is injected and a distribution section that distributes the highly thermally conductive resin 40 to each stator slot 11. In FIG. 8, the gate 70 is shown radially, but it may be circular. The filled highly thermally conductive resin 40 moves in the axial direction and also moves in the radial direction within the stator slot 11 that is not sealed with the foam material 30. The highly thermally conductive resin 40 can enter the mesh of the protective slot paper 50 and contact the highly thermally conductive resin 40 and the coil 20. The highly thermally conductive resin 40 solidifies in the stator slot 11 after filling. This completes the resin sealing of the stator slot 11.

[0042] (Effects of this embodiment) In this embodiment, the following effects can be obtained.

[0043] As described above, the present embodiment includes the foaming material 30 that seals both axial end sides of the stator slot 11 by foaming, and the highly thermally conductive resin 40 that is filled inside the stator slot 11 whose both axial end sides are sealed by the foaming material 30. As a result, both axial end sides of the stator slot 11 can be sealed by foaming the foaming material 30, so there is no need to attach a mold for sealing both axial end sides of the stator slot 11 to the stator core 10, and there is no need to separately prepare a mold that matches the shape of the coil 20. As a result, both axial end sides of the stator slot 11 in which the coil 20 is arranged can be easily sealed. In addition, by providing the resin 40 that is filled inside the stator slot 11, it is possible to prevent the coil 20 from coming into contact with the stator slot 11 when the coil 20 is inserted into the stator slot 11, and the coil 20 can be fixed inside the stator slot 11.

[0044] In this embodiment, as described above, the resin contains the highly thermally conductive resin 40 having a higher thermal conductivity than the foam material 30, and the length of the highly thermally conductive resin 40 in the axial direction of the stator slot 11 is greater than the length of the foam material 30 in the axial direction of the stator slot 11. As a result, the resin contains the highly thermally conductive resin 40, which improves the heat dissipation of the stator core 10, and the heat generated from the coil 20 arranged in the stator slot 11 can be efficiently dissipated. In addition, since the length of the highly thermally conductive resin 40 in the axial direction of the stator slot 11 can be secured to be large, the surface area of ​​the highly thermally conductive resin 40 in contact with the coil 20 can be increased. As a result, the area of ​​the highly thermally conductive resin 40 in contact with the coil 20 can be increased, and the heat generated from the coil 20 can be effectively discharged to the outside.

[0045] In this embodiment, as described above, the foam material 30 is made of insulating slotted paper, and the highly thermally conductive resin 40 is made of insulating resin. As a result, since the foam material 30 and the highly thermally conductive resin 40 have insulating properties, by disposing the foam material 30 and the highly thermally conductive resin 40 between the stator core 10 and the coil 20, insulation between the stator core 10 and the coil 20 can be ensured.

[0046] In the present embodiment, as described above, the resin sealing method in the stator slot 11 includes a step of disposing the foaming material 30 on both axial end sides of the stator slot 11 of the stator core 10 including the coil 20, and foaming the foaming material 30 to seal both axial end sides of the stator slot 11, and a step of filling the highly thermally conductive resin 40 into the stator slot 11 whose both axial end sides are sealed with the foaming material 30 after foaming the foaming material 30. As a result, the highly thermally conductive resin 40 is filled in a state in which both axial end sides of the stator slot 11 are sealed with the foaming material 30, so that it is possible to prevent the highly thermally conductive resin 40 from leaking out of the stator slot 11 in the axial direction. Furthermore, by filling the highly thermally conductive resin 40 inside the stator slot 11, it is possible to prevent the coil 20 from coming into contact with the stator slot 11 when the coil 20 is inserted into the stator slot 11, and it is possible to fix the coil 20 in the stator slot 11. Furthermore, by providing a step of disposing foam material 30 on both axial end sides of stator slot 11 of stator core 10 including coil 20 and foaming it to seal both axial end sides of stator slot 11, both axial end sides of stator slot 11 can be sealed by foaming foam material 30 without disposing a mold on both axial end sides of stator core 10, eliminating the need for a step of attaching a mold for sealing both end sides of stator slot 11. As a result, it is possible to provide a resin sealing method that can easily seal both axial end sides of stator slot 11 in which coil 20 is disposed.

[0047] [Variations] The above-described embodiments disclosed herein should be considered as illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the description of the above-described embodiments, and further includes all modifications (variations) within the meaning and scope of the claims.

[0048] For example, in the above embodiment, the foam material 30 is made of slotted paper, but the present invention is not limited to this. In the present invention, the foam material 30 may be made of a resin having foaming properties.

[0049] In the above embodiment, the protective slot paper 50 has a mesh structure, but the present invention is not limited to this. In the present invention, as shown in Fig. 9, the protective slot paper 50 may be provided with multiple holes, or a mesh structure and multiple holes may be used in combination. In addition, as shown in Fig. 9, when multiple holes are arranged, they do not need to be arranged regularly, and the size of the holes does not need to be uniform. Furthermore, the holes may be polygonal rather than circular.

[0050] In the above embodiment, the die 60 is disposed on the end face in the axial direction, but the present invention is not limited to this. In the present invention, the die 60 may be disposed on the inside in the radial direction, as shown in FIG.

[0051] In the above embodiment, the protective slot paper 50 is provided, but the present invention is not limited to this. In the present invention, the protective slot paper 50 does not have to be provided.

[0052] In the above embodiment, the foam material 30 and the protective slot paper 50 are arranged so as not to overlap in the axial direction, but the present invention is not limited to this. In the present invention, the foam material 30 and the protective slot paper 50 may be arranged so as to overlap in the axial direction. The protective slot paper 50 may be arranged so as to surround the entire foam material 30, or may surround only a portion of it.

[0053] In the above embodiment, the protective slot paper 50 is surrounded by the foam material 30 when viewed from the axial direction, but the present invention is not limited to this. In the present invention, the protective slot paper 50 may be disposed at approximately the same position as the foam material 30 when viewed from the axial direction.

[0054] In the above embodiment, an example has been shown in which the length of the highly thermally conductive resin 40 in the axial direction of the stator slot 11 is greater than the length of the foam material 30 in the axial direction of the stator slot 11, but the present invention is not limited to this. In the present invention, the length of the highly thermally conductive resin 40 in the axial direction of the stator slot 11 may be the same as the length of the foam material 30 in the axial direction of the stator slot 11.

[0055] In the above embodiment, the foam material 30 is provided on both axial end sides of the stator slot 11, but the present invention is not limited to this. In the present invention, the foam material 30 may be provided near both end sides of the stator slot 11.

[0056] In the above embodiment, an example has been shown in which the axial end of the foam material 30 is located at the same position in the axial direction as the axial end 11c of the stator slot 11, but the present invention is not limited to this. In the present invention, the axial end of the foam material 30 may protrude from the axial end 11c of the stator slot 11 in the axial direction, or may be located more centrally in the axial direction than the axial end 11c of the stator slot 11.

[0057] In the above embodiment, the resin is the high thermal conductivity resin 40 having a thermal conductivity higher than that of the foam material 30, but the present invention is not limited to this. In the present invention, the thermal conductivity of the resin may be equal to or lower than that of the foam material 30. [Explanation of symbols]

[0058] 10 Stator core 11. Status Slot 11c end 20 Coil 30 Foam material 40 High thermal conductive resin 100 Stator

Claims

1. a stator core including a stator slot in which a coil is disposed; A foaming material is disposed on both axial end sides of the stator slot and foams to seal both axial end sides of the stator slot; a resin filled inside the stator slot, the stator slot having both axial end sides sealed with the foam material.

2. The resin includes a highly thermally conductive resin having a thermal conductivity higher than that of the foam material, The stator according to claim 1 , wherein a length of the resin in the axial direction of the stator slot is greater than a length of the foam material in the axial direction of the stator slot.

3. The foam material is made of insulating slotted paper, The stator according to claim 1 , wherein the resin is made of an insulating resin.

4. a step of disposing a foaming material on both end sides in an axial direction of a stator slot of a stator core including a coil, and foaming the foaming material to seal both end sides in an axial direction of the stator slot; and then filling the inside of the stator slot, both axial end sides of which are sealed with the foaming material, with resin.

Images