Stator manufacturing method

Abstract

This improves the workability of forming wedges and securely fixes the wedges in the slots. [Solution] The stator 10 is formed by laminating magnetic steel plates in the axial direction Da, and includes a stator core 20 with a slot 22 recessed from the inner circumferential surface toward the outer circumferential side and extending in the axial direction Da, a stator winding 30 housed in the slot 22, and a wedge 40 formed by hardening liquid resin that closes the slot opening 22A connecting the internal space 22I of the slot 22 and the internal space 20I of the stator core 20.

Description

Technical Field

[0001] The present invention relates to a stator and a method for manufacturing a stator, and is suitable for application to, for example, a method for forming a wedge for fixing a stator winding of a stator of a rotating electrical machine in a slot.

Background Art

[0002] Conventionally, a rotating electrical machine having a stator and a rotor has been widely known. In such a rotating electrical machine, there is a stator configured by a stator core and a stator winding housed in a slot on the inner peripheral side of the stator core. In such a stator, there is a structure that prevents the stator winding from falling off to the inner peripheral side from the opening of the slot by closing the opening of the slot with a wedge (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For such a stator, it is desired to improve the workability of forming a wedge and to firmly fix the wedge in the slot.

[0005] The present invention has been made in consideration of the above points, and intends to propose a stator and a method for manufacturing a stator that can improve the workability of forming a wedge and firmly fix the wedge in the slot.

Means for Solving the Problems

[0006] To solve these problems, the stator of the present invention is provided with a stator core formed by stacking magnetic steel plates in the axial direction, with slots formed that are recessed from the inner circumferential surface toward the outer circumferential side and extend in the axial direction, stator windings housed in the slots, and wedges formed by hardening liquid resin that close the slot openings and connect the internal space of the slots with the internal space of the stator core.

[0007] Furthermore, in the method for manufacturing a stator of the present invention, the stator is formed by stacking magnetic steel plates in the axial direction, and has a stator core with a slot formed that is recessed from the inner surface toward the outer surface and extends in the axial direction, a stator winding housed in the slot, and a wedge formed by the hardening of liquid resin that closes the slot opening and connects the internal space of the slot to the internal space of the stator core, and the method for manufacturing a stator is provided with a stator winding installation step of installing the stator winding in the slot, a core insertion step of inserting a core into the internal space of the stator core, a resin filling step of filling the slot with resin, a resin hardening step of hardening the resin, and a core removal step of removing the core from the internal space of the stator core after the resin has hardened.

[0008] This invention improves the workability of wedge formation by curing a fluid liquid resin to form a wedge that seals the slot opening, and the liquid resin fills the slot opening without gaps to match the shape of the slot opening, allowing the wedge to be firmly fixed in the slot. [Effects of the Invention]

[0009] According to the present invention, the workability of forming wedges can be improved by curing a fluid liquid resin to form wedges that seal the slot openings. Furthermore, the liquid resin fills the slot openings without gaps to conform to their shape, allowing the wedges to be firmly fixed to the slots. Thus, the present invention provides a stator and a method for manufacturing a stator that improves the workability of forming wedges and allows the wedges to be firmly fixed to the slots. [Brief explanation of the drawing]

[0010] [Figure 1]This is a cross-sectional view in the axial direction showing the configuration of the stator according to the first embodiment. [Figure 2] The configuration of the slot, stator winding, and wedge according to the first embodiment is shown in the cross-sectional view taken along the arrow AA in Figure 1. [Figure 3] This is a cross-sectional view in the axial direction showing a method for manufacturing a stator according to the first embodiment (1). [Figure 4] Figure 3 shows a cross-sectional view taken along the line AA in the first embodiment, illustrating the method for manufacturing a stator (2). [Figure 5] This is a perspective view showing the configuration of the core according to the first embodiment. [Figure 6] This is a cross-sectional view in the axial direction showing the configuration of the stator according to the second embodiment. [Figure 7] The configuration of the slot, stator winding, and wedge according to the second embodiment is shown in the cross-sectional view taken along the arrow AA in Figure 6. [Figure 8] This is a perspective view showing the core configuration according to the second embodiment. [Figure 9] This is a perspective view showing the configuration of the pressing tool according to the second embodiment. [Figure 10] This shows a cross-sectional view of a location where slits are arranged in the axial direction, illustrating a method for manufacturing a stator according to a second embodiment. [Figure 11] This is a cross-sectional view in the axial direction showing the configuration of the stator of a comparative example. [Figure 12] The configuration of the slot, stator winding, and wedge of a comparative example is shown in the cross-sectional view taken along the arrow AA in Figure 11. [Modes for carrying out the invention]

[0011] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

[0012] [1. First Embodiment] [1-1. Stator Configuration] As shown in FIG. 1, the stator 10 is generally cylindrical in shape and is composed of a stator core 20 having a central axis as its axis, a stator winding 30, and a wedge 40, and is used in a rotating electric machine. Hereinafter, the direction along the central axis is defined as the axial direction Da, and the direction along the outer periphery of the stator 10 at a position in the predetermined axial direction Da is defined as the circumferential direction Dc. Also, the direction approaching the central axis when viewed from the axial direction Da is called the inner peripheral direction, and the direction separating from the central axis when viewed from the axial direction Da is called the outer peripheral direction. Further, the direction orthogonal to the axial direction Da and along the inner peripheral direction and the outer peripheral direction is also called the radial direction Dd. Further, with respect to the radial direction Dd, the side closer to the central axis is also called the inner side or the inner peripheral side, and the side separating from the central axis is also called the outer side or the outer peripheral side.

[0013] The stator core 20 is cylindrical with a central axis as its axis, and annular electromagnetic steel sheets are laminated in the axial direction Da. In this stator core 20, slots 22 shown in FIG. 2 that are recessed in a substantially square shape toward the outer peripheral direction from the inner peripheral surface of the stator core, i.e., the stator core inner peripheral surface 20S, are formed at equal intervals in the circumferential direction Dc from one end side to the other end side in the axial direction Da. Therefore, the slots 22 are provided radially over the entire circumference of the stator core inner peripheral surface 20S from the central axis toward the outer peripheral side.

[0014] Specifically, when viewed from the axial direction Da (i.e., in the cross section), the slot 22 is configured symmetrically with respect to a straight line along the radial direction Dd as its axis, and an outer peripheral side surface 22oS, a one-direction side surface 22cS1, a other-direction side surface​​​One-direction side surface 22cS1 is a plane extending from one-direction end of circumferential direction Dc on outer peripheral side surface 22oS orthogonally to outer peripheral side surface 22oS and extending inward along radial direction Dd. The other-direction side surface 22cS2 is a plane extending from the other-direction end of circumferential direction Dc on outer peripheral side surface 22oS orthogonally to outer peripheral side surface 22oS and extending inward along radial direction Dd, and is opposed to one-direction side surface 22cS1 with respect to circumferential direction Dc.

[0016] One-direction inclined surface 22sS1 is a plane extending from the inner peripheral side end of one-direction side surface 22cS1 and inclining inward along radial direction Dd toward slot opening 22A with respect to outer peripheral side surface 22oS. The other-direction inclined surface 22sS2 is a plane extending from the inner peripheral side end of the other-direction side surface 22cS2 and inclining inward along radial direction Dd toward slot opening 22A with respect to outer peripheral side surface 22oS. Inner peripheral one-direction side surface 22iS1 is a plane extending from the inner peripheral side end of one-direction inclined surface 22sS1 to the inner peripheral surface 20S of the stator core along radial direction Dd in parallel with one-direction side surface 22cS1. Inner peripheral other-direction side surface 22iS2 is a plane extending from the inner peripheral side end of the other-direction inclined surface 22sS2 to the inner peripheral surface 20S of the stator core along radial direction Dd in parallel with the other-direction side surface 22cS2, and is opposed to inner peripheral one-direction side surface 22iS1 with respect to circumferential direction Dc.

[0017] Slot opening 22A is opened so as to communicate the internal space 22I of slot 22 and the internal space 20I of stator core 20, and the width in circumferential direction Dc is narrowed to about half of the interval between one-direction side surface 22cS1 and the other-direction side surface 22cS2.

[0018] The stator winding 30 is formed by bundling together multiple copper wires 32 with a circular cross-section, and then insulating these copper wires 32 by wrapping them in insulating paper 34, and is housed within each slot 22. The insulating paper 34 has its outer peripheral side in contact with the outer peripheral side 22oS, and its circumferential Dc side in contact with the unidirectional side 22cS1 and the other-directional side 22cS2. Furthermore, a slot gap 22G is formed in the space enclosed by the side of the insulating paper 34 on the slot opening 22A side, the unidirectional inclined surface 22sS1, the other-directional inclined surface 22sS2, the inner circumferential unidirectional side 22iS1, and the inner circumferential other-directional side 22iS2.

[0019] The wedge 40 is formed by the hardening of liquid filler 42 that is filled without gaps in the slot gap 22G, thereby blocking the slot opening 22A and preventing the copper wire 32 and insulating paper 34 from falling out towards the inner circumference from the slot opening 22A of the slot 22. The inner surface of the wedge 40 is flush with the inner surface 20S of the stator core without any steps. In this embodiment, the filler 42 is made of, for example, an epoxy resin that hardens over time.

[0020] [1-2. Stator manufacturing method] Next, the manufacturing method of the stator 10 will be described. First, stator windings 30 are inserted into each of the slots 22 of the stator core 20, which is formed by stacking annular electromagnetic steel sheets in the axial direction Da (stator winding installation step). Subsequently, as shown in Figures 3 and 4, the core 50 is moved upward in one direction of the axial direction Da, with the cylindrical portion 50C as the leading edge in the direction of travel, and is inserted into the internal space 20I of the stator core 20 (core insertion step).

[0021] As shown in Figure 5, the core 50 is composed of a cylindrical portion 50C and a flange 50F. The cylindrical portion 50C occupies most of the core 50 and is a solid cylindrical shape with a central axis. The axial length Da of this cylindrical portion 50C is at least the same as the stator core 20, and its outer diameter is approximately the same as the inner diameter of the stator core 20. Therefore, the outer surface of the cylindrical portion 50C is in close contact with the inner surface 20S of the stator core over its entire circumference in the circumferential direction Dc. Furthermore, the outer surface of the cylindrical portion 50C is treated with a release treatment, such as a coating, to enhance release properties (non-stickiness), so that the filler 42 does not adhere to the outer surface.

[0022] The flange 50F is a disc shape formed on the lower side of the cylindrical portion 50C, which is the other end in the axial direction Da, and has a larger outer diameter than the cylindrical portion 50C. Therefore, when the core 50 is inserted into the internal space 20I of the stator core 20 (Figures 3 and 4), the flange 50F covers the lower side of the slot gap 22G, preventing the lower opening of the slot gap 22G from being exposed to the outside.

[0023] Next, the filler 42 is poured and filled into the slot gap 22G without any gaps from the upper side, which is the side where the cylindrical portion 50C of the core 50 is positioned with respect to the axial Da of the stator core 20 (resin filling process). As a result, the filler 42 is also poured into the slot opening 22A. Furthermore, if a gap is formed between the insulating paper 34 and the inner surface of the slot 22, the filler 42 also flows into the gap between the insulating paper 34 and the inner surface of the slot 22. At this time, the outer circumferential surface of the cylindrical portion 50C of the core 50 is in close contact with the inner circumferential surface 20S of the stator core. As a result, the core 50 can prevent the filler 42 from leaking out to the inner side from the slot opening 22A. At this time, the flange 50F of the core 50 is blocking the lower opening in the slot gap 22G. As a result, the core 50 can prevent the filler 42 from leaking out to the outside from the lower end side of the slot gap 22G. When this filler 42 hardens, the wedge 40 is formed (resin hardening process).

[0024] Next, the core 50 is moved downwards, which is the opposite direction to the axial direction Da, and is pulled out from the internal space 20I of the stator core 20 to the outside (core removal process). At this time, the cylindrical portion 50C has a release treatment applied to its outer surface. Therefore, the core 50 can be pulled out without the filler 42 adhering to it after the filler 42 has hardened.

[0025] [1-3. Effects, etc.] In the above configuration, during the manufacturing of the stator 10, the core 50 is inserted into the internal space 20I of the stator core 20, and while the outer surface of the cylindrical portion 50C of the core 50 is in close contact with the inner surface 20S of the stator core, a liquid epoxy resin filler 42 is poured into the gap 22G inside the slot without any gaps and filled, and when the filler 42 hardens, the wedge 40 is formed.

[0026] Therefore, the stator 10 can fix the stator winding 30 within the slot 22, and the wedge 40 can close the slot opening 22A of the slot 22, preventing the stator winding 30 from falling out towards the inner circumference from the slot opening 22A.

[0027] Here, as a comparative example, in the manufacturing process of the stator 210 shown in Figures 11 and 12, where the same reference numerals are used for the corresponding components in Figures 1 and 2 respectively, a thin plate-shaped wedge 240 is struck with a hammer or the like and inserted into the gap 22G inside the slot. The frictional force between the wedge 240 and the inner surface of the slot 22 holds the wedge 240 inside the slot 22, thereby blocking the slot opening 22A and preventing the stator winding 30 from falling out towards the inner circumference from the slot opening 22A.

[0028] However, in that case, inserting the wedge 240 into the slot 22 was not easy, and there was a possibility that the wedge 240 would be damaged when inserted into the slot 22. Also, since a thin plate-shaped wedge 240 had to be inserted into all of the slots 22, it was time-consuming. Furthermore, depending on the manufacturing dimensional tolerances of the slot 22 and the thin plate-shaped wedge 240, the frictional force between the wedge 240 and the inner surface of the slot 22 was small, and there was a possibility that the wedge 240 would fall out of the slot 22.

[0029] In contrast, in this embodiment, the stator 10 has a core 50 inserted into the internal space 20I of the stator core 20, and a filler 42, which is a highly fluid and easily flowable liquid epoxy resin, is poured into the gaps 22G within the slots without any gaps to fill them. When the filler 42 hardens, the wedge 40 is formed.

[0030] Therefore, the stator 10 allows for the formation of the wedge 40 through a simple process: loading a liquid epoxy resin filler 42 into the slot 22 and allowing the filler 42 to harden over time, thereby simplifying the process and reducing working time, thus improving work efficiency. In particular, the work efficiency of the stator 10 can be further improved as the number of slots 22 increases. The stator 10 also prevents damage to the wedge 40. Furthermore, the stator 10 ensures that the wedge 40 is firmly bonded to the inner surface of the slot 22 by the filler 42, which is liquid epoxy resin, as it fills the gaps 22G within the slots without any gaps and hardens while adhering tightly to the inner surface of the slot 22, thus preventing the wedge 40 from falling out of the slot 22.

[0031] In addition, conventionally, in the manufacturing process of stators, a ball-shaped filler material having predetermined plasticity, which is made by kneading glass fibers, iron powder, and epoxy resin, is filled into the slot opening 22A of the slot 22 and hardened to form a magnetic wedge.

[0032] In contrast, in the stator 10 according to this embodiment, with the core 50 inserted into the internal space 20I of the stator core 20, a filler 42, which is a highly fluid and easily flowable liquid epoxy resin, is poured into the gaps 22G within the slots without any gaps and filled. When the filler 42 hardens, the wedge 40 is formed. Therefore, compared to such conventional stators, the stator 10 can be manufactured more easily and the working time can be shortened, thus improving workability. In particular, the workability of the stator 10 can be improved even further as the number of slots 22 increases. Furthermore, compared to such conventional stators, the filler 42 in the stator 10 is filled more tightly along the fine shape of the slot opening 22A and adheres closely to the inner surface of the slot 22, and the filler 42 can also adhere closely to the irregularities between adjacent electrical steel sheets and harden. As a result, the wedge 40 is fixed more firmly to the slot 22 in the stator 10, preventing the wedge 40 from coming out of the slot 22.

[0033] According to the above configuration, the stator 10 is provided with a stator core 20 formed by laminating magnetic steel plates in the axial direction Da, with a slot 22 formed therein that is recessed from the inner circumferential surface toward the outer circumferential side and extends in the axial direction Da, a stator winding 30 housed in the slot 22, and a wedge 40 formed by hardening liquid resin that closes the slot opening 22A connecting the internal space 22I of the slot 22 and the internal space 20I of the stator core 20.

[0034] Furthermore, the method for manufacturing the stator 10 comprises a stator core 20 formed by laminating magnetic steel sheets in the axial direction Da, with a slot 22 formed therein that is recessed from the inner surface toward the outer surface and extends in the axial direction Da, a stator winding 30 housed in the slot 22, and a wedge 40 formed by hardening liquid resin that closes a slot opening 22A connecting the internal space 22I of the slot 22 and the internal space 20I of the stator core 20, wherein the method for manufacturing the stator 10 includes a stator winding installation step of installing the stator winding 30 in the slot 22, a core insertion step of inserting a core 50 into the internal space 20I of the stator core 20, a resin filling step of filling the slot 22 with a filler 42 which is a liquid resin, and a core removal step of removing the core 50 from the internal space 20I of the stator core 20 after the filler 42 has hardened.

[0035] As a result, the stator 10 can improve the workability of forming the wedge 40 by curing a fluid liquid resin to form a wedge 40 that closes the slot opening 22A, and the liquid resin can be filled without gaps to match the shape of the slot opening 22A, thereby firmly fixing the wedge 40 to the slot 22.

[0036] [2. Second Embodiment] [2-1. Stator Configuration] As shown in Figures 6 and 7, where the same reference numerals are used for the corresponding members in Figures 1 and 2, respectively, the stator 110 according to the second embodiment differs from the stator 10 according to the first embodiment in that it has wedges 140 instead of wedges 40, but is otherwise configured similarly. Each wedge 140, which is positioned at the same location with respect to the circumferential direction Dc and extends in the axial direction Da, is positioned such that, compared to the wedge 40, the positions corresponding to, for example, four rectangular prism-shaped slits 150S along the axial direction Da in the core 150 shown in Figure 8 are excluded.

[0037] [2-2. Stator Manufacturing Method] Next, the manufacturing method of the stator 110 will be described. First, stator windings 30 are inserted into each of the slots 22 of the stator core 20, which is formed by stacking annular electromagnetic steel sheets in the axial direction Da (stator winding installation process). Subsequently, the core 150 (Figure 8) is moved upward in one direction of the axial direction Da, with the cylindrical portion 150C as the leading edge in the direction of travel, and is inserted into the internal space 20I of the stator core 20 (core insertion process).

[0038] As shown in Figure 8, which uses the same reference numerals as Figure 5 for the corresponding components, the core 150 differs from the core 50 in that it has a cylindrical portion 150C instead of a cylindrical portion 50C, but is otherwise constructed similarly. The cylindrical portion 150C occupies most of the core 150 and is a hollow cylindrical shape with a central axis. The axial length Da of this cylindrical portion 150C is at least the same as the stator core 20, and its outer diameter is approximately the same as the inner diameter of the stator core 20. For this reason, the cylindrical portion 150C is in close contact with the inner circumferential surface 20S of the stator core over its entire circumference in the circumferential direction Dc. Furthermore, the outer surface of the cylindrical portion 150C is treated with a release agent to prevent the filler 42 from adhering to this outer surface.

[0039] In the cylindrical portion 150C, a rectangular prism-shaped slit 150S penetrates from the inside to the outside of the cylindrical portion 150C at a location opposite the slot opening 22A when the core 150 is inserted into the internal space 20I. For example, four slits 150S are formed at equal intervals along the axial direction Da, with respect to the same position in the circumferential direction Dc. Hereinafter, these four slits 150S arranged at the same position in the circumferential direction Dc will be collectively referred to as the slit row 150SL.

[0040] Next, the pressing tool 60 shown in Figure 9 is inserted into the internal space of the core 150, and the projections 60P are inserted into each of the four slits 150S in the slit row 150SL so that they protrude to the outside of the core 150, as shown in Figure 10. Therefore, the pressing tool 60 is pushed outwards so that the projections 60P are inserted into the slots 22, come into contact with the stator windings 30, and are pressed against the outer peripheral side surface 22oS (stator winding pressing process).

[0041] The pressing tool 60 is inserted into the slits 150S in all rows of slits 150SL such that the projections 60P protrude to the outside of the core 150. Therefore, the pressing tool 60 inserts the projections 60P into all slots 22 and pushes them outward so that they come into contact with the stator windings 30 and press against the outer peripheral side surface 22oS.

[0042] The pressing jig 60 is composed of a main body 60B and projections 60P. The main body 60B is a plate-shaped member that extends in a straight line. The projections 60P are rectangular parallelepiped-shaped members that protrude in a straight line from the side of the main body 60B, with the same spacing as the axial spacing Da of the slits 150S in the cylindrical part 150C, and the same number as the slits 150 in one slit row 150SL, for example, four projections. When the projections 60P are inserted into the slits 150S, the projections 60P have the same shape and size as the slits 150S when viewed along the radial direction Dd, and the width in the circumferential direction Dc is slightly narrower than the width of the slot opening 22A. Furthermore, the projections 60P of the pressing jig 60 have a release treatment applied to their surface to prevent the filler 42 from adhering to it.

[0043] Next, the filler 42 is poured and filled into the slot gap 22G without any gaps from the upper side, which is the side surface where the cylindrical portion 150C of the core 150 is positioned with respect to the axial direction Da of the stator core 20 (resin filling process). As a result, the filler 42 is also poured into the slot opening 22A. At this time, the outer circumferential surface of the cylindrical portion 150C of the core 150 is in close contact with the inner circumferential surface 20S of the stator core. As a result, the core 150 can prevent the filler 42 from leaking out to the inner side from the slot opening 22A. Also at this time, the flange 50F of the core 150 is blocking the lower opening in the slot gap 22G. As a result, the core 150 can prevent the filler 42 from leaking out to the outside from the lower end side of the slot gap 22G.

[0044] Furthermore, at this time, the projection 60P of the pressing jig 60 presses the stator winding 30 against the outer peripheral side surface 22oS. Therefore, the pressing jig 60 can prevent the shape of the stator winding 30 from collapsing within the slot 22 while the filler 42 is still soft and hardens. Once the filler 42 hardens, the wedge 140 is formed (resin hardening process).

[0045] Next, the pressing tool 60 is pulled out on the inner side, and the projection 60P is pushed out of the slot 22 (projection return process). At this time, the projection 60P has a release treatment applied to its surface. Therefore, the pressing tool 60 can be pulled out after the filler 42 has hardened without the filler 42 sticking to it.

[0046] Next, the core 150 is moved downwards, which is the opposite direction to the axial direction Da, and is pulled out from the internal space 20I of the stator core 20 to the outside (core removal process). At this time, the cylindrical portion 150C has been treated with a release agent on its outer surface. Therefore, the core 150 can be pulled out without the filler 42 adhering to it after the filler 42 has hardened.

[0047] [2-3. Effects, etc.] In the above configuration, during the manufacturing of the stator 110, the core 150 is inserted into the internal space 20I of the stator core 20, and the projection 60P of the pressing tool 60 is inserted so that it protrudes to the outside of the core 150, and the projection 60P presses the stator winding 30 against the outer peripheral surface 22oS of the slot 22. Furthermore, while the state in which the stator winding 30 is pressed against the outer peripheral surface 22oS by the projection 60P is maintained, a liquid epoxy resin filler 42 is poured into the gap 22G inside the slot without any gaps and filled, and when the filler 42 hardens, the wedge 140 is formed.

[0048] Therefore, the pressing tool 60 maintains the posture of the stator winding 30 from the time the filler 42 is poured into the gap 22G inside the slot until it hardens, and prevents the shape of the stator winding 30 from collapsing inside the slot 22 while the filler 42 hardens.

[0049] In other respects as well, the stator 110 according to the second embodiment can achieve the same effects as the stator 10 according to the first embodiment.

[0050] [3. Other Embodiments] In the first embodiment described above, the stator 10 is described in a case where the filler 42 is poured into and filled without any gaps in the slot gap 22G, and the slot opening 22A is sealed by the filler 42. The present invention is not limited to this, and even if there are spaces in the slot gap 22G where the filler 42 is not filled, the stator 10 only needs to be able to prevent the stator winding 30 from falling out towards the inner circumference from the slot opening 22A by sealing the slot opening 22A with the filler 42. The same applies to the second embodiment.

[0051] Furthermore, in the first embodiment described above, the stator 10 was described in a case where the filler 42 was made of epoxy resin, which is an adhesive that hardens over time. The present invention is not limited to this, and the stator 10 may be made of filler 42 made of various other adhesives such as resins that harden over time, or the filler 42 may be made of various other materials such as UV-curing adhesives, adhesives that harden with accelerators, adhesives that harden with temperature changes, or fillers that are mixtures thereof. The same applies to the second embodiment.

[0052] Furthermore, in the first embodiment described above, the stator 10 was described in the case where the cylindrical portion 50C of the core 50 is a solid cylindrical shape. The present invention is not limited to this, and the stator 10 may also have a hollow cylindrical shape for the cylindrical portion 50C of the core 50.

[0053] Furthermore, in the second embodiment described above, the stator 110 is provided with four slits 150S in each slit row 150SL, and the pressing jig 60 is provided with four projections 60P, the same number as the slits 150 in one slit row 150SL. The present invention is not limited to this, and the stator 110 may be provided with any other number of slits 150S in each slit row 150SL, and the pressing jig 60 may be provided with the same number of projections 60P as the slits 150 in one slit row 150SL.

[0054] Furthermore, the present invention is not limited to the embodiments described above and other embodiments. That is, the scope of the present invention also extends to embodiments obtained by arbitrarily combining some or all of the embodiments described above and other embodiments. In addition, the scope of the present invention also extends to embodiments obtained by extracting a part of the configuration described in any embodiment from the embodiments described above and other embodiments and substituting or adapting it for a part of the configuration of any embodiment from the embodiments described above and other embodiments, or by adding a part of the extracted configuration to any embodiment.

[0055] Furthermore, the above-described embodiment describes a case in which the stator 10 or 110 is composed of a stator core 20, stator windings 30, and wedges 40 or 140. The present invention is not limited to this, and the stator may be composed of a stator core, stator windings, and wedges in various other configurations. [Industrial applicability]

[0056] The present invention can be used in stators. [Explanation of Symbols]

[0057] 10, 110, 210... Stator, 20... Stator core, 20S... Inner surface of stator core, 20I... Internal space, 22... Slot, 22I... Internal space, 22oS... Outer surface, 22cS1... One-way side, 22cS2... Other-way side, 22sS1... One-way inclined surface, 22sS2... Other-way inclined surface, 22iS1... Inner surface one-way, 22iS2... Inner surface other-way, 22A... Slot opening Part, 22G...Slot gap, 30...Stator winding, 32...Copper wire, 34...Insulating paper, 40, 140, 240...Wedge, 42...Filler, 50, 150...Core, 50C...Cylindrical part, 50F...Flange, 150C...Cylindrical part, 150S...Slit, 150SL...Row of slits, 60...Pressing jig, 60B...Main body part, 60P...Protrusion, Da...Axial direction, Dd...Radial direction, Dc...Circumferential direction.

Claims

1. A stator core formed by stacking magnetic steel sheets in the axial direction, with slots formed that are recessed from the inner circumferential surface toward the outer circumferential side and extending in the axial direction, The stator winding housed in the aforementioned slot, A wedge formed by the hardening of liquid resin, which closes the slot opening that connects the internal space of the slot and the internal space of the stator core. A stator with a long neck.

2. The wedge is filled in the space enclosed by the inner surface of the slot, the stator winding, and the slot opening. The stator according to claim 1.

3. A method for manufacturing a stator comprising a stator core formed by laminating magnetic steel sheets in the axial direction, with a slot formed therein from the inner circumferential surface toward the outer circumferential side and extending in the axial direction, a stator winding housed in the slot, and a wedge formed by hardening liquid resin that closes the slot opening connecting the internal space of the slot and the internal space of the stator core, A stator winding installation step involves installing the stator winding in the slot, A core insertion step of inserting a core into the internal space of the stator core, A resin filling step of filling the slot with the resin, A core removal step in which the core is removed from the internal space of the stator core after the resin has hardened. A method for manufacturing a stator having

4. The core, with its outer surface, closes the inner side of the slot opening. A method for manufacturing a stator according to claim 3.

5. The core has a circular outer surface, and the outer surface is in contact with the inner surface of the stator core. A method for manufacturing a stator according to claim 4.

6. The core is subjected to a release treatment at least on its outer surface. A method for manufacturing a stator according to claim 5.

7. The core has a flange formed on one side in the axial direction of the space enclosed by the inner surface of the slot, the stator winding, and the slot opening. In the resin filling step, the resin is filled into the slot from the other axial direction side of the space. A method for manufacturing a stator according to claim 3.

8. The core has a slit formed in it that penetrates from the inside to the outside of the core, at a position facing the slot when it is inserted into the internal space of the stator core. The stator winding installation process, The aforementioned core insertion step, A stator winding pressing step is performed by moving the projection toward the outer circumference through the slit and pushing the stator winding toward the outer circumference, The resin filling step, A protrusion return step is performed to move the protrusion to the inner circumference side of the slit after the resin has hardened. The core removal process and A method for manufacturing a stator according to claim 3, having the following characteristics:

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