JP2015208186A - Stator of rotary electric machine and method for manufacturing stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine capable of fastening the entire wire wound around an insulator by impregnating varnish into the inner layer side of a wire without using a complicated process when varnish treatment is performed on the wire of a stator tooth, and also to provide a method for manufacturing the stator of the rotary electric machine.SOLUTION: There is disclosed a stator of a rotary electric machine which includes: a plurality of stator teeth arranged in an annular shape; and an insulator (2) which is provided at the axial end of the stator teeth and insulates the wire wound around the stator teeth and the stator teeth. The insulator has a groove (5) which diffuses varnish to a winding of the innermost layer of the wound winding over a diameter direction of the stator, in a diameter direction plane upper part (4) in contact with the winding of the innermost layer when drop treatment of the varnish is performed after the winding is wound therearound.

Description

  The present invention includes a plurality of stator teeth arranged in an annular shape, and an insulator that is provided at an axial end of the stator teeth and insulates the stator teeth from an electric wire wound around the stator teeth. The present invention relates to a rotating electrical machine stator and a method of manufacturing a rotating electrical machine stator.

  In a rotating electrical machine, a resin impregnation process is performed for winding protection and fixing of a stator that has been wound after an insulating material is inserted into an iron core. The insulating material to be inserted into the iron core is composed of an insulator, insulating paper, or a combination thereof, and is selectively used depending on the type and application of the rotating electrical machine.

  In addition, as a method for protecting and fixing the winding of the stator, self-bonding of electric wires, molding resin molding, varnish treatment, and the like can be mentioned, and these methods are properly used depending on applications / processes and types of electric wires.

  Further, the varnish treatment method as the resin impregnation treatment of the stator includes a dripping impregnation treatment, a semi-immersion rotation treatment, a full impregnation treatment, a vacuum impregnation treatment, a printing coating, a flow coating, and the like. It is properly used according to the required characteristics.

  The varnish dripping impregnation method, which is an example of a resin impregnation treatment of a stator, is a method in which varnish is dripped onto a necessary portion of a winding portion of a stator. In the varnish dripping impregnation method, preheating treatment may be performed as necessary, and in some cases, the stator may be dripped by rotating or tilting.

  Moreover, the varnish dripped on the stator is cured after penetrating between the windings in the lower part in the axial direction of the iron core due to its own weight in addition to the capillary phenomenon. After the dripping treatment, the varnish is generally cured by heat treatment.

  In recent rotating electrical machines, the winding line area ratio has been remarkably improved, the varnish filling density in the windings has been reduced, and it has become difficult to completely fix all the windings. Therefore, various conditions for increasing the varnish filling density have been studied.

  For example, as a technique for improving the varnish filling density, a method is known in which a gap is formed between a wound wire and a wall surface of an insulator protrusion in a stator in which an insulator is inserted and wound by an iron core. (For example, refer to Patent Document 1).

JP 2011-200050 A

However, the prior art has the following problems.
The stator of the rotating electrical machine of Patent Document 1 is provided with a gap between the electric wire and the axial wall of the insulator, and by using the gap, the coil is impregnated without accumulating varnish at the wall of the insulator. The purpose is to make it.

  However, many electric wires wound around the insulator exist not only near the wall perpendicular to the axial direction of the insulator but also between the inner diameter side and outer diameter side walls. Therefore, it is desirable to fix the whole electric wire wound around the stator, and it is also preferable to fix the electric wire between the both walls.

  Here, in the stator of the rotating electrical machine of Patent Document 1, the wound outer peripheral side electric wire is impregnated and fixed by varnish dropping and coating. However, since the varnish along both walls normally flows directly to the lower part in the axial direction, there is a problem that the varnish does not easily flow into the electric wire between both walls.

  Moreover, when winding an electric wire, a delicate gap often occurs between electric wires or between electric wire walls. In general, the gaps are not necessarily fixed positions but are scattered at different positions. For this reason, depending on the position of the gap, the locations where the varnish is wound from the outer layer side to the inner layer side are also scattered.

  Thus, in order to infiltrate the varnish throughout the inner layer side of the wound wire, it is necessary to devise an impregnation process such as stator inclination angle management, temperature management, varnish viscosity management, and there is a problem in terms of productivity. there were.

  The present invention has been made to solve the above-described problems. When a varnish treatment is performed on an electric wire of a stator tooth, the varnish is allowed to penetrate to the inner layer side of the electric wire without using a complicated process. An object of the present invention is to obtain a stator for a rotating electrical machine and a method for manufacturing the stator for the rotating electrical machine capable of fixing the entire electric wire wound around the insulator.

  A stator of a rotating electrical machine according to the present invention includes a plurality of stator teeth arranged in an annular shape, an electric wire provided on an axial end of the stator teeth, and wound around the stator teeth, and the stator teeth. A stator of a rotating electrical machine having an insulating insulator, and the insulator is fixed to the innermost layer winding of the wound winding during the varnish dripping process after winding the winding. A groove for diffusing the varnish over the radial direction of the child is provided in the upper part of the radial plane in contact with the innermost winding.

  In addition, a method for manufacturing a stator of a rotating electrical machine according to the present invention includes a plurality of stator teeth arranged in an annular shape, an electric wire provided at an axial end of the stator teeth and wound around the stator teeth, A method of manufacturing a stator of a rotating electrical machine including an insulator that insulates stator teeth, wherein the winding of the innermost layer of the wound winding is performed during the varnish dripping process after winding the winding. Attaching an insulator to the axial end portion of the stator teeth, in which a groove for diffusing the varnish across the radial direction of the stator with respect to the wire is provided on the upper portion of the radial plane in contact with the innermost winding; The stator teeth to which the insulator is attached are wound with a step of winding the winding, and by performing a varnish dripping treatment from above the electric wire wound on the upper portion of the radial plane provided with the groove, Accumulated in the groove The varnish, to diffuse across the radial direction of the innermost layer of the winding, in which a step of fixing the wire and insulator.

  According to the stator of the rotating electric machine according to the present invention, the groove on the side on which the electric wire in the axial direction of the insulator is wound is provided with a groove for collecting the varnish and facilitating the penetration into the electric wire during the varnish dripping treatment. doing. As a result, when the electric wires of the stator teeth are varnished, the rotating electric machine can fix the entire electric wire wound around the insulator by allowing the varnish to penetrate to the inner layer side of the electric wire without using a complicated process. The stator and the manufacturing method of the stator of the rotating electrical machine can be obtained.

It is a longitudinal cross-sectional view which shows typically the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a top view which shows typically the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the example of a shape of the insulator which concerns on Embodiment 1 of this invention. It is a top view which shows the example of a shape of the insulator which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows typically the state by which the electric wire was wound by the stator teeth by which the insulator which concerns on Embodiment 1 of this invention was mounted. It is the top view which showed typically only the innermost layer part of the electric wire of the state by which the electric wire was wound by the stator teeth with which the insulator which concerns on Embodiment 1 of this invention is mounted. In FIG. 5 which concerns on Embodiment 1 of this invention, it is the 1st longitudinal cross-sectional view which showed typically the state in the middle of the varnish being impregnated. In FIG. 5 which concerns on Embodiment 1 of this invention, it is the 2nd longitudinal cross-sectional view which showed typically the state in the middle of a varnish being impregnated. It is a perspective view which shows the example of a shape of the insulator which concerns on Embodiment 2 of this invention. It is a top view which shows the example of a shape of the insulator which concerns on Embodiment 2 of this invention. It is the top view which showed typically only the innermost layer part of the electric wire currently wound by the insulator which concerns on Embodiment 2 of this invention. It is a perspective view which shows the example of a shape of the insulator which concerns on Embodiment 3 of this invention. It is a top view which shows the example of a shape of the insulator which concerns on Embodiment 3 of this invention. It is a side view which shows the example of a shape of the insulator which concerns on Embodiment 3 of this invention. It is the top view which showed typically only the innermost layer part of the electric wire currently wound by the insulator which concerns on Embodiment 3 of this invention. It is the side view which showed typically only the innermost layer part of the electric wire currently wound by the insulator which concerns on Embodiment 3 of this invention. It is a perspective view which shows the example of a shape of the insulator which concerns on Embodiment 4 of this invention. It is a top view which shows the example of a shape of the insulator which concerns on Embodiment 4 of this invention. It is the top view which showed typically only the innermost layer part of the electric wire currently wound by the insulator which concerns on Embodiment 4 of this invention. It is a perspective view which shows the example of a shape of the insulator which concerns on Embodiment 5 of this invention. It is a top view which shows the example of a shape of the insulator which concerns on Embodiment 5 of this invention. It is the top view which showed typically only the innermost layer part of the electric wire currently wound by the insulator which concerns on Embodiment 5 of this invention.

  Hereinafter, preferred embodiments of a stator for a rotating electrical machine and a method for manufacturing a stator for a rotating electrical machine according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated about the part which is the same or it corresponds in each figure.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view schematically showing a stator of a rotating electric machine according to Embodiment 1 of the present invention. FIG. 2 is a top view schematically showing the stator of the rotating electrical machine according to the first embodiment of the present invention. In the stator of the rotating electrical machine shown in FIGS. 1 and 2, an insulator 2 of an insulating material is inserted into a plurality of stator teeth 1 arranged in an annular shape, and an electric wire 3 is wound.

  FIG. 3 is a perspective view showing a shape example of the insulator 2 according to Embodiment 1 of the present invention. FIG. 4 is a top view showing a shape example of the insulator 2 according to Embodiment 1 of the present invention. FIG. 5 is a longitudinal sectional view schematically showing a state in which the electric wire 3 is wound around the stator tooth 1 on which the insulator 2 according to Embodiment 1 of the present invention is mounted.

  The insulator 2 shown in FIGS. 3, 4, and 5 has a groove 5 for collecting the varnish 6 and facilitating the penetration into the electric wire 3 when the stator tooth 1 and the electric wire 3 are varnished. It is on the upper part 4 in the radial plane.

  And the groove | channel 5 in this Embodiment 1 is provided toward the outer diameter side from the radial inner diameter side of the radial direction plane upper part 4 as shown in FIG.3 and FIG.4.

  The insulator 2 has an inner diameter side wall 20 on the inner diameter side in the radial direction, and an outer diameter side wall 21 on the outer diameter side. Further, both side surfaces in the circumferential direction of the insulator 2 are insulator side surfaces 12.

  FIG. 6 is a top view schematically showing only the innermost layer portion of the electric wire 3 in a state where the electric wire 3 is wound around the stator tooth 1 on which the insulator 2 according to the first embodiment of the present invention is mounted. is there. 7 and 8 are longitudinal sectional views schematically showing a state in the middle of impregnation of the varnish 6 in FIG.

  The varnish treatment will be described with reference to FIGS. The varnish 6 dropped from the upper part of the electric wire 3 wound on the radial plane upper part 4 of the insulator 2 reaches the groove 5 provided in the insulator 2 through the gaps 7A and 7B between the electric wires 3. Since the gaps 7 </ b> A and 7 </ b> B between the electric wires 3 are not equal in size at the winding portion of the electric wire 3, the gaps 7 </ b> A and 7 </ b> B reach the groove 5 from the place where the gaps 7 </ b> A and 7 </ b> B between the electric wires 3 are large.

  5-8, the varnish 6 reaches | attains the groove | channel 5 from two places of the clearance gaps 7A and 7B. The varnish 6 reaching from the gaps 7A and 7B diffuses in the grooves 5 formed in the radial direction as shown in FIG. And the varnish 6 which diffused in the groove | channel 5 accumulates in the groove | channel 5 as shown in FIG.

  Thus, the varnish 6 which reached | attained in the groove | channel 5 is filled in the groove | channel 5 as shown in FIG. 8 because the varnish 6 is continuously dripped at the whole winding part of the electric wire 3. FIG. Further, the varnish 6 overflows from the grooves 5 formed in the radial direction, so that the varnish 6 can be attached to the entire inner layer side of the electric wire 3 wound around the insulator 2.

  As described above, according to the first embodiment, the radial groove is provided on the upper portion of the radial plane around which the electric wire of the insulator is wound. As a result, the varnish dropped and applied to the upper part of the wound electric wire and partially transmitted from the gap between the electric wires to the wound inner diameter side can be stored in the groove. And it becomes possible to impregnate the whole wound electric wire by spreading the varnish which was filled in the groove formed in the radial direction and overflowed to the whole wound inner diameter side.

Embodiment 2. FIG.
In the first embodiment, the case where one groove is provided from the inner diameter side to the outer diameter side in the radial direction of the upper portion 4 in the radial direction of the insulator has been described. On the other hand, in this Embodiment 2, a groove | channel does not correspond with the winding direction of an electric wire toward the circumferential direction outer side from the circumferential direction center part of the stator teeth of the radial direction plane upper part 4 of an insulator. A case where a plurality of grooves are provided in the groove direction will be described.

  FIG. 9 is a perspective view showing an example of the shape of the insulator 8 according to Embodiment 2 of the present invention. FIG. 10 is a top view showing a shape example of the insulator 8 according to Embodiment 2 of the present invention. FIG. 11 is a top view schematically showing only the innermost layer portion of the electric wire 3 wound around the insulator 8 according to Embodiment 2 of the present invention.

  As shown in FIGS. 9 and 10, the insulator 8 according to the second embodiment winds the electric wire 3 from the central portion in the radial direction of the upper portion 4 in the radial direction toward the outer circumferential side (insulator side surface 12 side). A groove 9 is provided so as to be a groove direction that does not coincide with the direction.

  When the dripping process of the varnish 6 is performed using the insulator 8 of the second embodiment, as shown in FIG. 11, the gaps 7 </ b> A and 7 </ b> B between the electric wires 3 are partially obtained as in the first embodiment. The varnish 6 that has penetrated into the groove reaches the groove 9. Then, the varnish 6 that has reached the groove 9 diffuses in the groove 9 and accumulates in the groove 9.

  Thus, the varnish 6 which reached | attained in the groove | channel 9 is filled in the groove | channel 9 because the varnish 6 is dripped continuously over the whole. As a result, as in the first embodiment, the varnish 6 filled in the groove 9 overflows from the groove 9 so that the varnish 6 can be attached to the entire inner layer side of the wound wire 3.

  Moreover, since the insulator 8 is provided with the grooves 9 in a plurality of directions, the varnish 6 can be quickly spread over the entire innermost layer of the electric wire 3. As a result, the varnish 6 can be attached to the entire innermost layer of the electric wire 3 more easily than the groove 5 of FIG. 3 in the first embodiment.

  As described above, according to the second embodiment, a configuration is provided in which grooves are provided in a direction different from the winding direction of the electric wire from the circumferential central portion of the upper portion in the radial direction toward the outer side in the circumferential direction. . As a result, the varnish dropped and applied to the upper part of the wound electric wire and partially transmitted from the gap between the electric wires to the wound inner diameter side can be stored in the groove. And since the varnish with which the groove | channel was filled and overflowed can be spread | diffused in the radial direction of the inner layer side of the wound electric wire, the whole electric wire inner layer side can be impregnated.

  Note that the direction of the groove 9 provided on the upper portion 4 in the radial plane of the insulator 8 does not coincide with the winding direction of the electric wire 3 so that the electric wire 3 does not get caught in the groove 9 and block the groove 9. It only needs to be in the groove direction. Thereby, the flow of the varnish 6 is not hindered by the electric wire 3.

Embodiment 3 FIG.
In the previous second embodiment, the groove 9 is provided so as to be in a groove direction that does not coincide with the winding direction of the electric wire 3 from the center side in the circumferential direction of the upper portion 4 in the radial direction of the insulator 8 toward the outside. Explained the case. On the other hand, in this Embodiment 3, the case where a groove | channel is further provided in the both sides | surfaces of an insulator is demonstrated.

  FIG. 12 is a perspective view showing a shape example of the insulator 10 according to Embodiment 3 of the present invention. FIG. 13 is a top view showing a shape example of the insulator 10 according to Embodiment 3 of the present invention. FIG. 14 is a side view showing a shape example of the insulator 10 according to Embodiment 3 of the present invention. FIG. 15 is a top view schematically showing only the innermost layer portion of the electric wire 3 wound around the insulator 10 according to the third embodiment of the present invention. FIG. 16 is a side view schematically showing only the innermost layer portion of the electric wire 3 wound around the insulator 10 according to the third embodiment of the present invention.

  As shown in FIGS. 12 and 13, the insulator 10 according to the third embodiment does not coincide with the winding direction of the electric wire 3 from the center side in the circumferential direction of the upper portion 4 in the radial direction of the insulator 10 toward the outside. The same groove 11 as that of the second embodiment is provided so as to be in the groove direction.

  And as shown in FIG. 12 and FIG. 14, the insulator 10 of the third embodiment has a groove direction that does not coincide with the winding direction of the electric wire 3 on the insulator side surfaces 12 that are both side surfaces on the circumferential side of the insulator 10. A groove 13 connected to the groove 11 is further provided.

  When the varnish 6 is dropped using the insulator 10 of the third embodiment, as shown in FIG. 15, from the gaps 7 </ b> A and 7 </ b> B between the electric wires 3 as in the first and second embodiments. The partially infiltrated varnish 6 can be spread over the entire radial plane top 4 through the groove 11. For this reason, the varnish 6 can be made to adhere to the whole inner layer side coil of the wound electric wire 3.

  Furthermore, after the varnish 6 is filled in the groove 11, it overflows in the upper surface direction of the insulator 10 and, as shown in FIG. 16, the varnish 6 overflows and flows out by the groove 13 provided on the insulator side surface 12 of the insulator 10. As a result, the varnish 6 can be spread on both side surfaces on the circumferential side of the insulator 10, and the varnish 6 can be adhered to the inner layer portion of the electric wire 3 wound on both side surfaces on the circumferential side of the insulator 10. Yes.

  As described above, according to the third embodiment, in addition to the groove on the upper portion in the radial direction plane, the structure is provided with grooves on both side surfaces on the circumferential direction side of the insulator. As a result, varnish can be impregnated not only in the inner layer portion of the electric wire wound on the upper radial plane of the insulator but also in the inner layer portion of the electric wire wound on both sides in the circumferential direction of the insulator. It becomes.

  The direction of the groove 13 provided on the insulator side surface 12 of the insulator 10 is a groove direction that does not coincide with the winding direction of the electric wire 3 so that the electric wire 3 does not get caught in the groove 13 and block the groove 13. It only has to be. Thereby, the flow of the varnish 6 is not hindered by the electric wire 3.

Embodiment 4 FIG.
In the fourth embodiment, the grooves provided in the radial direction of the radial plane upper portion 4 of the insulator in the previous first embodiment and the circumferential direction of the radial plane upper portion 4 of the insulator in the previous second embodiment are provided. A case where both of the grooves are provided will be described.

  FIG. 17 is a perspective view showing an example of the shape of the insulator 14 according to Embodiment 4 of the present invention. FIG. 18 is a top view showing a shape example of the insulator 14 according to Embodiment 4 of the present invention. FIG. 19 is a top view schematically showing only the innermost layer portion of the electric wire 3 wound around the insulator 14 according to the fourth embodiment of the present invention.

  As shown in FIGS. 17 and 18, the insulator 14 according to the fourth embodiment is directed from the radially inner diameter side to the outer diameter side of the radial plane upper portion 4 of the insulator 14 as in the first embodiment. Thus, a first groove 15 is provided. Further, similarly to the second embodiment, the first direction is a groove direction that does not coincide with the winding direction of the electric wire 3 from the center side in the circumferential direction of the upper portion 4 in the radial direction of the insulator 14 toward the outside. Two grooves 16 are provided. The first groove 15 and the second groove 16 are connected.

  When the dripping process of the varnish 6 is performed using the insulator 14 of the fourth embodiment, as shown in FIG. 19, from the gaps 7 </ b> A and 7 </ b> B between the electric wires 3 as in the first to third embodiments. The partially infiltrated varnish 6 can be spread over the entire upper radial plane 4 through the first groove 15 and the second groove 16.

  As described above, according to the fourth embodiment, the varnish that has overflowed from the first groove and the second groove in the upper radial direction is caused by the varnish flowing into the first groove and the second groove. Spread over the entire upper radial plane. Furthermore, since the first groove and the second groove are connected, the varnish spreads between the first groove and the second groove, and the varnish can be quickly impregnated. For this reason, compared with previous Embodiment 1-3, it becomes possible to adhere a varnish to the inner layer side coil of the wound electric wire more rapidly and still more.

Embodiment 5 FIG.
In the fifth embodiment, a case will be described in which the groove is connected to either or both of the radial inner diameter side wall and the outer diameter side wall of the radial plane upper portion 4.

  FIG. 20 is a perspective view showing a shape example of the insulator 17 according to Embodiment 5 of the present invention. FIG. 21 is a top view showing a shape example of the insulator 17 according to Embodiment 5 of the present invention. FIG. 22 is a top view schematically showing only the innermost layer portion of the electric wire 3 wound around the insulator 17 according to the fifth embodiment of the present invention.

  As shown in FIGS. 20 and 21, the insulator 17 according to the fifth embodiment is connected to the first radial grooves 18 of the radial upper surface 4 connected to each other and the periphery, as in the fourth embodiment. A second groove 19 in the direction is provided.

  Further, in the insulator 17 according to the fifth embodiment, as shown in FIGS. 20 and 21, the first groove 18 and the second groove 19 are formed in the radially inner side wall 20 and the outer side of the radially upper plane 4. It is also connected to the radial side wall 21.

  When the dripping process of the varnish 6 is performed using the insulator 17 of the fifth embodiment, as shown in FIG. 22, from the gaps 7 </ b> A and 7 </ b> B between the electric wires 3 as in the first to fourth embodiments. Not only the varnish 6 that has partially penetrated but also the varnish 6 that has penetrated through the gap 22 between the inner diameter side wall 20 and the outer diameter side wall 21 and the electric wire 3 can be spread over the entire upper portion 4 in the radial direction.

  As described above, according to the fifth embodiment, the groove is connected to either or both of the radially inner diameter side wall and the outer diameter side wall in the upper portion of the radial plane. As a result, the varnish that has permeated through the gap between the inner diameter side wall and the outer diameter side wall and the electric wire flows into the first groove and the second groove. For this reason, since the varnish overflowing from the first groove and the second groove spreads over the entire upper portion in the radial plane of the insulator, the varnish is quickly and evenly attached to the inner layer side coil of the wound wire. It becomes possible.

  In the first to fifth embodiments, the type of the varnish 6 used for the varnish treatment is a thermosetting type, and examples thereof include varnish 6 such as polyester, epoxy, and epoxy polyester. The viscosity may be appropriately diluted depending on the workability required.

  Further, in the previous second to fifth embodiments, the second grooves, that is, the grooves 9, 11, 13, 15, 16, 18, 19 are in a groove direction that does not coincide with the winding direction of the electric wire 3. Provided. As a result, the electric wire 3 is not inserted into the second groove, and the flow of the varnish 6 in the second groove is not hindered.

  Further, the number of the second grooves is not limited to the present embodiment, and may be one or plural. Also, the shape of the second groove is not necessarily a straight line, and may be a curved shape. Needless to say, the angle of the second groove with respect to the winding direction of the electric wire 3 is not limited to those of the second to fifth embodiments.

  1 Stator Teeth 2, 8, 10, 14, 17 Insulator, 3 Electric Wire, 4 Upper Radial Plane, 5, 9, 11, 13, 15, 16, 18, 19 Groove, 6 Varnish, 7A, 7B, 22 Clearance, 12 insulator side, 20 inner diameter side wall, 21 outer diameter side wall.

Claims (6)

A plurality of stator teeth arranged in a ring;
A stator of a rotating electrical machine provided with an insulator that is provided at an axial end portion of the stator teeth and that insulates the electric wires wound around the stator teeth and the stator teeth;
The insulator diffuses the varnish in the radial direction of the stator with respect to the innermost layer winding of the wound winding during the varnish dripping process after winding the winding. A stator of a rotating electrical machine having a groove in a radial upper portion in contact with the innermost winding layer. The said insulator has the 1st groove | channel provided in the said radial direction upper part from the inner diameter side of the said radial direction toward the outer diameter side as said groove | channel. Fixing of the rotary electric machine of Claim 1 Child. The insulator has a second groove provided at the upper portion of the radial plane so as to be in a groove direction that does not coincide with the winding direction of the electric wire from the circumferential center to the outer side in the circumferential direction. The stator of the rotating electrical machine according to claim 1, wherein the stator is a groove. The insulator further includes a third groove that is provided in a side surface portion connected to the upper portion in the radial direction plane so as to be in a groove direction that does not coincide with the winding direction of the electric wire and is connected to the second groove. The stator for a rotating electrical machine according to claim 3. The fixing of the rotating electrical machine according to any one of claims 1 to 4, wherein the groove is connected to either or both of the radially inner diameter side wall and the outer diameter side wall of the insulator at an upper portion of the radial plane. Child. A plurality of stator teeth arranged in a ring;
A method of manufacturing a stator of a rotating electrical machine, comprising: an electric wire provided at an axial end of the stator teeth; and an insulator that insulates the stator teeth from an electric wire wound around the stator teeth,
During the varnish dripping process after winding the winding, the groove for diffusing the varnish across the radial direction of the stator with respect to the innermost winding of the wound winding, Attaching the insulator provided at the upper portion of the radial plane in contact with the innermost winding to the axial end of the stator teeth;
Winding the winding around the stator teeth to which the insulator is attached;
The varnish collected in the groove by dropping the varnish from above the electric wire wound on the upper radial plane provided with the groove, the diameter of the innermost layer winding. A method of manufacturing a stator of a rotating electrical machine, comprising: a step of diffusing in a direction to fix the electric wire and the insulator.

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