Stator of a rotating electric machine

Abstract

The objective is to provide a stator for a rotating electric machine that can efficiently cool the stator coils by using a coolant flowing in the axial direction of the stator. [Solution] The interphase insulator 35 has a pair of interphase insulating sheet portions 36 that face opposite the stator coils 15 of different phases in the slot 26 and extend along the axial direction of the stator core 15, and a shielding portion 37 that blocks the flow of refrigerant so that the refrigerant flowing toward the slot 26 does not flow between the pair of interphase insulating sheet portions 36. The interphase insulating sheet portions 36 and the shielding portion 37 are connected in the axial direction at a position away from the coil ends 34 of the stator coil 30.

Description

【Technical Field】 【0001】 This invention relates to a stator of a rotating electric machine. 【Background Art】 【0002】 As a conventional technique related to the stator of a rotating electric machine, for example, an electric motor disclosed in Patent Document 1 is known. The electric motor disclosed in Patent Document 1 includes a stator in which a plurality of steel plates are laminated. Slots are provided in the stator by adjacent tooth portions, and a winding is directly wound around the tooth portions of the stator through resin insulation. The stator is provided with a convex portion that protrudes from the outer peripheral wall of the slot bottom facing the slot side of the resin insulator to the slot side in order to insulate between windings. The convex portion catches to prevent the phase insulator from falling off. Further, the phase insulator is formed in a substantially V-shaped cross-sectional shape when viewed from the stator lamination direction, and the opening of the substantially V shape is inserted facing each slot opening of the stator. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2011-72128 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 However, in the electric motor disclosed in Patent Document 1, for example, when the refrigerant flows in the axial direction of the electric motor, the refrigerant flows along the axial direction through the space opened in a substantially V shape in the phase insulator, so the amount of refrigerant hitting the coil end of the stator coil (winding) is reduced. Further, since the phase insulator is a film-like thin plate insulating material or a resin-molded insulating material, its thermal conductivity is low, and the effect of cooling the stator coil by the refrigerant flowing through the space opened in a substantially V shape through the phase insulator is small. That is, in the stator of this type of rotating electric machine, there is a problem that the stator coil cannot be efficiently cooled by the refrigerant. 【0005】 The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to provide a stator for a rotating electric machine that can efficiently cool the stator coils with a coolant flowing in the axial direction of the stator. [Means for solving the problem] 【0006】 To solve the above problems, the present invention provides a stator for a rotating electric machine having a stator core comprising an annular yoke portion, a plurality of teeth portions extending radially from the yoke portion toward the center, and slots formed between the teeth portions, a stator coil wound by concentrated winding around the teeth, and an interphase insulator inserted into the slots to insulate adjacent stator coils of different phases, wherein the interphase insulator comprises a pair of sheet-like interphase insulating sheet portions that face the stator coils of different phases in the slots and extend along the axial direction of the stator core, and a shielding portion that blocks the flow of refrigerant along the axial direction toward the space formed between the pair of interphase insulating sheet portions. 【0007】 In this invention, the interphase insulator has a pair of interphase insulating sheet portions that face opposite stator coils of different phases in the slot and extend along the axial direction of the stator core, and a shielding portion that blocks the flow of refrigerant along the axial direction toward the space formed between the pair of interphase insulating sheet portions. Therefore, the refrigerant flowing toward the space formed between the pair of interphase insulating sheet portions is blocked by the shielding portion. The blocked refrigerant can then move toward the coil ends. As a result, the coil ends can be efficiently cooled by the refrigerant, and the stator coils can be efficiently cooled by the refrigerant flowing axially toward the stator core. 【0008】 Furthermore, in the stator of the rotating electric machine described above, the interphase insulating sheet portion and the shielding portion may be formed by bending the interphase insulator. In this case, since the interphase insulating sheet portion and the shielding portion are formed by bending the interphase insulator, the number of parts can be reduced, and manufacturing costs can be reduced. 【0009】 Furthermore, in the stator of the rotating electric machine described above, a through space may be formed in the slot between the stator coil and the interphase insulating sheet portion, with the through space penetrating the slot. In this case, since a through-space is formed between the stator coil and the interphase insulating sheet portion in the slot, the refrigerant directed toward the space formed between the pair of interphase insulating sheet portions flows through the through-space, thereby cooling the stator coil more efficiently with the refrigerant. 【0010】 Furthermore, in the stator of the rotating electric machine described above, the shielding portion may be configured to have a refrigerant guide surface that guides the refrigerant flowing toward the space to the coil end. In this case, the refrigerant blocked by the shielding portion is guided to the coil end by the refrigerant guide surface. As a result, in addition to the refrigerant directed towards the space formed between the pair of interphase insulating sheets, the refrigerant guided by the refrigerant guide surface also hits the coil end, allowing the stator coil to be cooled more efficiently. 【0011】 Furthermore, in the stator of the rotating electric machine described above, the shielding portion may be configured as a cover member connected to the interphase insulating sheet portion by attaching the cover member to the interphase insulating sheet portion. In this case, the shielding portion is a lid member that is a separate component from the interphase insulating sheet portion, and since the lid member is attached to the interphase insulating sheet portion, the materials of the shielding portion and the interphase insulating sheet portion can be different from each other. [Effects of the Invention] 【0012】 According to the present invention, it is possible to provide a stator for a rotating electric machine that can efficiently cool the stator coils with a coolant flowing in the axial direction of the stator. [Brief explanation of the drawing] 【0013】 [Figure 1] It is a side view schematically showing a stator of a rotating electric machine according to the first embodiment. [Figure 2] It is a front view schematically showing a stator of a rotating electric machine according to the first embodiment. [Figure 3] It is a cross-sectional view of a main part schematically showing a main part of a stator of a rotating electric machine [Figure 4] It is an enlarged front view of a main part cross section of a stator core and an interphase insulator. [Figure 5] It is a perspective view of an interphase insulator before being inserted into a slot. [Figure 6] It is a developed view of an interphase insulator. [Figure 7] It is an explanatory diagram explaining the relationship between the flow of a refrigerant and an interphase insulator. [Figure 8] It is an enlarged front view of an interlayer insulator according to the second embodiment. [Figure 9] (a) is a perspective view of an interphase insulator according to the third embodiment, and (b) is an explanatory diagram of the interphase insulator. [Figure 10] (a) is an explanatory diagram showing Modification 1, (b) is an explanatory diagram showing Modification 2, and (c) is an explanatory diagram showing Modification 3. 【MODE FOR CARRYING OUT THE INVENTION】 【0014】 (First Embodiment) Hereinafter, a stator of a rotating electric machine according to the first embodiment will be described with reference to the drawings. The rotating electric machine of the present embodiment is an electric motor used for an in-vehicle electric compressor that compresses a refrigerant. Further, the electric motor of the present embodiment is an interior permanent magnet synchronous motor. First, the electric motor to which the stator of the rotating electric machine of the present invention is applied will be described. 【0015】 As shown in FIG. 1, the electric motor 10 includes a rotor 11 and a stator 12. The electric motor is an electric motor that is driven by receiving three-phase AC power from a drive circuit (not shown). The rotor 11 includes a rotor core 13 and a rotating shaft 14 fixed in a state of being inserted through the center of the rotor core 13. The rotor core 13 has a substantially cylindrical shape and is formed, for example, by laminating core plates (not shown) made of a magnetic steel plate. The rotor core 13 is provided with a plurality of magnet insertion holes (not shown) along the direction of the axis P of the rotating shaft 14. Permanent magnets (not shown) are fixed to the rotor core 13 in a state of being respectively inserted into the plurality of magnet insertion holes. The rotating shaft 14 is rotatably supported by a bearing (not shown) in a housing (not shown). In FIG. 1, the upper shaft portion of the rotating shaft 14 is an output shaft portion connected to a compression portion (not shown). 【0016】 The stator 12 has a cylindrical (annular) stator core 15. The stator core 15 is formed, for example, by laminating core plates (not shown) made of a magnetic steel plate. The axis of the stator core 15 coincides with the axis P of the rotating shaft 14. As shown in FIG. 2, the stator core 15 has a cylindrical yoke portion 16 constituting the outer peripheral portion of the stator core 15 and a plurality of teeth portions 18 protruding from the inner peripheral surface 17 of the yoke portion 16 toward the radial center of the rotating shaft 14. The plurality of teeth portions 18 are arranged at intervals in the circumferential direction. The teeth portion 18 extends from the inner peripheral surface 17 of the yoke portion 16 toward the axis of the stator core 15. An outer peripheral surface 19 is provided on the opposite side in the radial direction of the inner peripheral surface 17 of the yoke portion 16. The surface 20 on the opposite side of each teeth portion 18 from the inner peripheral surface 17 of the yoke portion 16 is formed in an arc shape along the outer peripheral surface of the rotor core 13. 【0017】 The pair of end faces 21 of the yoke portion 16 in the axial direction of the stator core 15 are substantially flat surfaces. The pair of end faces 22 of each tooth portion 18 in the axial direction of the stator core 15 are substantially flat surfaces. The end faces 21 of the yoke portion 16 and the end faces 22 of each tooth portion 18 are located on the same plane. The end faces 21 of the yoke portion 16 and the end faces 22 of each tooth portion 18 form a pair of end faces 23 in the axial direction of the stator core 15. 【0018】 The teeth portion 18 has a tooth body 24 that extends from the inner circumferential surface 17 of the yoke portion 16. The teeth portion 18 also has a pair of flanges 25 at the tip located opposite the base of the tooth body 24. The pair of flanges 25 are portions that protrude from the tip of the tooth body 24 toward both sides in the circumferential direction of the stator core 15. A space, or slot 26, is formed between adjacent teeth portions 18. Therefore, the stator core 15 has a plurality of slots 26. As shown in Figure 3, a gap, or slot opening 27, is formed between the flanges 25 in the slot 26. 【0019】 As shown in Figures 1 and 2, the stator 12 has stator coils 30. A portion of the stator coils 30 passes through slots 26. As shown in Figure 3, the stator 12 is equipped with slot insulating sheets 31 that are inserted into each slot 26 and positioned between the stator coils 30 and the teeth 18. The slot insulating sheets 31 insulate the portion of the stator coils 30 passing through each slot 26 from the stator core 15. The slot insulating sheets 31 are elongated strips of sheet curved in a roughly U-shape along their shorter side. The slot insulating sheets 31 are inserted into the slots 26 with their longitudinal direction coinciding with the axial direction of the stator core 15. 【0020】 The slot insulating sheet 31 extends along the yoke portion 16 and tooth portion 18 that form the slot 26. The slot insulating sheet 31 also extends from one end to the other in the axial direction of the stator core 15. The slot insulating sheet 31 has an opening (not shown) such that a gap is formed in accordance with the slot opening 27. The opening of the slot insulating sheet 31 extends from one end to the other in the longitudinal direction of the slot insulating sheet 31. 【0021】 The material for the slot insulation sheet 31 may be selected from, for example, polyamide resin (PA), polyacetal resin (POM), polycarbonate resin (PC), polyethylene sulfide (PPS), liquid crystal polymer (LCP), fluororesin, polyether ether ketone (PEEK), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN), but a material with excellent heat resistance is preferred. 【0022】 The stator coil 30 is formed by winding a winding 33 in a concentrated winding manner around each tooth body 24. In other words, the stator coil 30 is formed by winding a winding 33 around the tooth portion 18. As shown in Figure 1, the portion of the stator coil 30 that protrudes from the slot 26 is the coil end 34. Therefore, the coil end 34 is the part that protrudes from the slot 26, and the axial length of the stator coil 30 is longer than the axial length of the stator core 15. 【0023】 As shown in Figure 1, adjacent stator coils 30 in the circumferential direction of the stator core 15 in each slot 26 are of different phases (U phase, V phase, and W phase). For example, each stator coil 30 has one lead wire (not shown) at the beginning of the winding 33, and the one lead wire of each phase's stator coil 30 is bundled together for each phase and electrically connected to the corresponding phase's power supply terminal (not shown). Also, each stator coil 30 has the other lead wire (not shown) at the end of the winding 33, and the other lead wires of each phase's stator coil 30 are electrically connected to each other at a neutral point connection (not shown). The rotor 11 rotates when current flows through the stator coils 30. 【0024】 As shown in Figures 3 and 4, a sheet-like interphase insulator 35 is inserted into each slot 26. The interphase insulator 35 is formed by folding a sheet material made of insulating material. The material of the rectangular interphase insulating sheet portion 36 may be selected from, for example, polyamide resin (PA), polyacetal resin (POM), polycarbonate resin (PC), polyethylene sulfide (PPS), liquid crystal polymer (LCP), fluororesin, polyether ether ketone (PEEK), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN), but a material with excellent heat resistance is preferred. 【0025】 As shown in Figure 5, the interphase insulator 35 has a pair of interphase insulating sheet portions 36 that face opposite phases of the stator coils 30 in the slot 26. The interphase insulating sheet portion 36 is a rectangular sheet portion having a pair of short sides 36A and a pair of long sides 36B, and extends along the axial direction of the stator core 15. The radial cross-section of the interphase insulating sheet portion 36 in the slot 26 is approximately V-shaped. In the radial direction of the slot 26, the gap of the interphase insulating sheet portion 36 widens from the inner circumferential surface 17 of the yoke portion 16 toward the slot opening 27. Therefore, the pair of interphase insulating sheet portions 36 form a V-shaped groove in the slot 26 in the axial direction of the stator core 15. The short sides 36A extend radially to the stator core 15, and the long sides 36B extend along the axial direction of the stator core 15. The interphase insulator 35 is held in place by friction with the stator coils 30. 【0026】 The interphase insulating sheet portion 36 protrudes from the slot 26 in the axial direction of the stator core 15. The short side 36A of the interphase insulating sheet portion 36, which is the axial end of the stator core 15, is located further from the end face 23 of the stator core 15 than the coil end 34 of the stator coil 30. One of the short sides 36A, which is located on the output side of the rotating shaft 14, is provided with a mountain-shaped shielding portion 37. The shielding portion 37 comprises a pair of roughly triangular triangular sheet portions 38. As shown in Figure 6, in the interphase insulator 35 before bending, the interphase insulating sheet portion 36 and the shielding portion 37 are integrally formed so that the shielding portion 37 is formed between a pair of rectangular interphase insulating sheet portions 36. Integrating the interphase insulating sheet portion 36 and the shielding portion 37 suppresses an increase in the number of parts. As shown in Figure 6, one of the short sides 36A of the interphase insulating sheet portion 36 indicates the position of bending by mountain folding. Furthermore, the short side 36A, which is the other end of the pair of interphase insulating sheet portions 36, is not provided with a shielding portion 37. 【0027】 As shown in Figures 5 and 6, the triangular sheet portion 38 has sides 38A, 38B, and 38C, with side 38A being connected to the short side 36A of the interphase insulating sheet portion 36. Side 38B of the pair of triangular sheet portions 38 is a common side formed by bending. Side 38C is not connected to any other part and extends along the extension of the long side 36B. The intersection of side 38B and the pair of sides 38C is the vertex 39 of the shielding portion 37. The vertex 39 is located further from the coil end 34 in the axial direction than the short side 36A. 【0028】 As shown in Figure 7, in this embodiment, the electric motor 10 generates a flow of refrigerant (indicated by arrow F) in the axial direction of the rotating shaft 14, from the output side of the shaft to the opposite side of the output side, for cooling the stator coil 30. The shielding portion 37 is provided to block the refrigerant flowing toward the space formed between the pair of interphase insulating sheet portions 36. In addition, the shielding portion 37 is arranged so that a pair of triangular sheet portions 38 expand from the upstream to the downstream direction of the refrigerant. The outer surface 38D of the triangular sheet portion 38 is inclined with respect to the direction of refrigerant flow, and guides the refrigerant flowing toward the space formed between the pair of interphase insulating sheet portions 36 toward the coil end 34. Therefore, the outer surface 38D of the triangular sheet portion 38 corresponds to a refrigerant guide surface that guides the refrigerant flowing toward the space formed between the pair of interphase insulating sheet portions 36 toward the coil end 34. Note that the vertical direction in Figure 7 is along the axial direction of the rotating shaft 14, and the left-right direction in Figure 7 is the circumferential direction of the stator core 15. Figure 7 shows the view from the rotor 11 to the stator 12 in the radial direction of the rotating shaft 14. 【0029】 Next, the operation of the stator 12 of the electric motor 10 according to this embodiment will be described. The interphase insulator 35 inserted into the slot 26 insulates the stator coils 30 of different phases that are adjacent to each other in the slot 26. The stator coils 30 generate heat when the electric motor 10 is driven. Therefore, in this embodiment, as shown in Figure 7, a flow of coolant is generated in the axial direction of the rotating shaft 14, and the stator coils 30 are cooled by the coolant hitting the coil ends 34. 【0030】 In this embodiment, a flow of refrigerant is generated in the axial direction of the rotating shaft 14, from the output side of the shaft to the opposite side of the output side. The means for generating the refrigerant flow along the axial direction can be any known means. A portion of the refrigerant flow hits the coil end 34 of the stator coil 30, cooling the coil end 34. The refrigerant flowing toward the interphase insulator 35 inserted into the slot 26 is redirected by the shielding portion 37 toward the coil end 34. Therefore, the refrigerant toward the space formed between the pair of interphase insulating sheet portions 36 does not flow through the V-shaped groove formed between the pair of interphase insulating sheet portions 36 in the slot 26 by the shielding portion 37. In other words, the shielding portion 37 blocks the refrigerant flowing toward the space formed between the pair of interphase insulating sheet portions 36. Furthermore, the triangular sheet portion 38 constituting the shielding portion 37 has an outer surface 38D, which guides the refrigerant flowing toward the space formed between the pair of interphase insulating sheet portions 36 toward the coil end 34. 【0031】 The stator 12 of the electric motor 10 according to this embodiment provides the following effects. (1) The refrigerant flowing toward the space (V-shaped groove) formed between the pair of interphase insulating sheet portions 36 is blocked by the shielding portion 37. The blocked refrigerant is then able to move toward the coil end 34. As a result, the coil end 34 can be efficiently cooled by the refrigerant, and the stator coil 30 can be efficiently cooled by the refrigerant flowing in the axial direction of the stator core 15. 【0032】 (2) Since the interphase insulating sheet portion 36 and the shielding portion 37 are formed by bending the interphase insulator 35, the number of parts can be reduced and the manufacturing cost of the interphase insulator 35 can be reduced. Also, since the interphase insulator 35 can be formed by bending, the interphase insulator 35 can be formed relatively easily. 【0033】 (3) The shielding portion 37 has a refrigerant guide surface that guides the refrigerant flowing toward the space formed between the pair of interphase insulating sheet portions 36 toward the coil end 34. The refrigerant blocked by the shielding portion 37 is guided toward the coil end 34 by the refrigerant guide surface. As a result, in addition to the refrigerant flowing toward the coil end 34, the refrigerant guided by the refrigerant guide surface also hits the coil end 34, allowing the stator coil 30 to be cooled more efficiently. 【0034】 (4) The shielding portion 37 is formed in a mountain shape by a pair of triangular sheet portions 38, so that it can reliably obstruct the refrigerant flowing toward the slot 26 and reliably guide it toward the coil end 34. 【0035】 (Second embodiment) Next, the stator of the electric motor according to the second embodiment will be described. This embodiment differs from the first embodiment in that a through space is formed between the stator coil and the interphase insulating sheet portion, with the slots passing through it. In this embodiment, the same configuration as in the first embodiment will be described by referring to the description of the first embodiment, and the same reference numerals will be used. 【0036】 As shown in Figure 8, in the stator 40 of the electric motor 10 of this embodiment, a through space 41 is formed in the slot 26 between the stator coil 30 and the interphase insulating sheet portion 36, passing through the slot 26. In this embodiment, the through space 41 is formed by changing the folding of the interphase insulator 35. Specifically, the through space 41 is formed by making the separation distance of the interphase insulating sheet portions 36 smaller than in the previous embodiment. In addition to changing the folding of the interphase insulator 35, the through space 41 can also be formed by changing, for example, the number of turns of the stator coil 30 or the thickness of the winding 33, or by enlarging the area of ​​the slot 26. In this embodiment, a positioning member (not shown) for fixing the circumferential position of the interphase insulator 35 is provided in contact with the shielding portion 37. The positioning member may be, for example, a cover member that covers the end face of the coil end 34. 【0037】 The shielding portion 37 blocks the flow of refrigerant toward the space (V-shaped groove) formed between the pair of interphase insulating sheet portions 36, and the blocked refrigerant is guided toward the through-space 41 by the refrigerant guide surface. The refrigerant flowing through the through-space 41 cools the stator coil 30 passing through the slot 26. 【0038】 According to this embodiment, the same effects as those of the first embodiment are achieved. Furthermore, in the slot 26, a through-space 41 is formed between the stator coil 30 and the interphase insulating sheet portion 36, penetrating the slot 26. The refrigerant heading towards the space formed between the pair of interphase insulating sheet portions 36 flows through the through-space 41, allowing the stator coil 30 to be cooled more efficiently by the refrigerant flowing through the through-space 41. 【0039】 (Third embodiment) Next, the stator of the electric motor according to the third embodiment will be described. This embodiment differs from the first embodiment in that the shielding portion is a separate component from the interphase insulation sheet portion. In this embodiment, the same configuration as in the first embodiment will be referred to in the description of the first embodiment, and the same reference numerals will be used. 【0040】 As shown in Figure 9(a), in the stator 50 of the electric motor 10 of this embodiment, the interphase insulator 51 is inserted into the slot 26. The interphase insulator 51 has a pair of interphase insulating sheet portions 52 and a shielding portion 53. The pair of interphase insulating sheet portions 52 are formed by bending a rectangular sheet material. The pair of interphase insulating sheet portions 52 are roughly V-shaped when viewed from the axial direction. The shielding portion 53 is formed by a single triangular sheet portion 54 so as to be able to close one end of the pair of interphase insulating sheet portions 52. The triangular sheet portion 54 corresponds to a cover member and is joined to one end of the interphase insulating sheet portion 52 with adhesive. As shown in Figure 9(b), the interphase insulating sheet portion 52 and the triangular sheet portion 54 are connected in the axial direction at a position away from the coil end 34 of the stator coil 30. The shielding portion 53 formed by the triangular sheet portion 54 blocks the flow of refrigerant toward the space formed between the pair of interphase insulating sheet portions 52, preventing refrigerant from flowing between the pair of interphase insulating sheet portions 52. 【0041】 In this embodiment, the same effect as effect (1) of the first embodiment is achieved. Furthermore, the triangular sheet portion 54 that forms the shielding portion 53 is a lid member that is a separate component from the interphase insulating sheet portion 52. Since the triangular sheet portion 54 is attached to the end of the interphase insulating sheet portion 52, the material of the triangular sheet portion 54 and the material of the interphase insulating sheet portion 52 can be made of different materials. In addition, by making the shielding portion 53 a separate component from the interphase insulating sheet portion 52, it is possible to make it difficult for the refrigerant to flow in the space between the pair of interphase insulating sheet portions 52. 【0042】 (Variations 1-3) Next, the shielding portion of the interphase insulator according to Modifications 1 to 3 will be described. In Modification 1 shown in Figure 10(a), the axial lengths of one end of the pair of interphase insulating sheet portions 62 (62L, 62S) of the interphase insulator 61 are different. A shielding portion 63 is formed to connect one interphase insulating sheet portion 62L and the other interphase insulating sheet portion 62S. The shielding portion 63 is formed by a single triangular sheet portion 64. The pair of interphase insulating sheet portions 62 and the triangular sheet portion 64 are integrally formed, and the shielding portion 63 is formed by bending. The shielding portion 63 blocks the refrigerant flowing towards the space formed between the pair of interphase insulating sheet portions 62. The blocked refrigerant guides the refrigerant from one side to the other in the circumferential direction of the stator core 15, cooling the coil end 34. The outer surface of the triangular sheet portion 64 corresponds to the refrigerant guide surface. 【0043】 In the modified example 2 shown in Figure 10(b), a shielding portion 73 is formed at one end of a pair of interphase insulating sheet portions 72 of the interphase insulator 71. The shielding portion 73 is formed by a curved sheet portion 74 that is curved in an arc shape rather than being folded. The pair of interphase insulating sheet portions 72 and the curved sheet portion 74 are integrally formed. The shielding portion 73 blocks the refrigerant flowing towards the space formed between the pair of interphase insulating sheet portions 72. The blocked refrigerant is guided toward the coil end 34, cooling the coil end 34. The outer surface of the curved sheet portion 74 corresponds to the refrigerant guide surface. 【0044】 In the modified example 3 shown in Figure 10(c), a shielding portion 83 is formed at one end of a pair of interphase insulating sheet portions 82 of the interphase insulator 81. The shielding portion 83 is formed by embedding and bonding a resin member 84 into a V-shaped groove in the pair of interphase insulating sheet portions 82. The resin member 84 is approximately triangular prism-shaped to fit the V-shaped groove. The end faces 84A and 84B of the resin member 84 in the axial direction of the rotation shaft 14 are flat, and the end face 84B located inside the V-shaped groove may be inside the stator coil 30 or stator core 15 in the axial direction, beyond the end face of the coil end 34. The shielding portion 73 blocks the refrigerant flowing towards the space formed between the pair of interphase insulating sheet portions 82. The blocked refrigerant changes direction from the axial direction of the stator core 15 to the circumferential direction. 【0045】 The present invention is not limited to the embodiments described above (including modifications), and various modifications are possible within the scope of the invention. For example, it may be modified as follows. 【0046】 ○ In the above embodiments (including modified examples), a space (V-shaped groove) is formed by a pair of interphase insulating sheet portions of the interphase insulator, but this is not limited to this. The space formed by a pair of interphase insulating sheet portions of the interphase insulator may, for example, have a substantially U-shaped cross-section, and the cross-sectional shape of the space may change depending on the state of the gap between the stator coils which are in different phases. ○ In the above embodiments (including modified versions), the interphase insulator is held in place by friction with the stator coil or by a positioning member, but it is not limited to this. In the interphase insulator, for example, a notch extending axially in the stator core may be provided in the slot. Then, a part of the interphase insulator (for example, a part of the long side of the interphase insulation sheet) may be inserted into this notch to position it circumferentially in the slot, and it may be held in place by frictional force with other members or by a separate member. ○ In the above embodiments (including modifications), the refrigerant was used as the refrigerant for the compressor, but it is not limited to this. The refrigerant may be a gas such as air, for example. ○ In the above embodiments (including modifications), the stator of an electric motor used in an on-board electric compressor for compressing a refrigerant was used as an example, but the invention is not limited to this. The stator of a rotating electric machine can be any configuration that includes a stator coil with concentrated windings, and the type of rotating electric machine is not limited. [Explanation of Symbols] 【0047】 10. Electric motors (rotating electric machines) 11 rotors 12, 40, 50 stats 14 Rotation axis 15 Stator Core 18 Teeth Department 26 slots 30 Stator Coil 31 Slot Insulation Sheet 34 Coil Ends 35, 51, 61, 71, 81 Interphase insulators 36, 52, 62, 72, 82 Interphase insulating sheet section 37, 53, 63, 73, 83 Shielding part 38, 54, 64, 74 Triangular sheet section 41 Through space P axis center

Claims

[Claim 1] A stator core comprising an annular yoke portion, a plurality of teeth portions extending radially from the yoke portion toward the center, and slots formed between the teeth portions, A stator coil formed by concentrated winding is wound around the aforementioned teeth, A stator of a rotating electric machine having an interphase insulator inserted into the slots and insulating adjacent stator coils of different phases from each other, The aforementioned interphase insulator is In the aforementioned slot, a pair of sheet-like interphase insulating sheet portions are provided, each facing the stator coil of a different phase and extending along the axial direction of the stator core, A stator for a rotating electric machine, characterized by having a shielding portion that obstructs the flow of refrigerant along the axial direction toward the space formed between the pair of interphase insulating sheet portions. [Claim 2] The stator of a rotating electric machine according to claim 1, characterized in that the interphase insulating sheet portion and the shielding portion are formed by bending the interphase insulator. [Claim 3] The stator of a rotating electric machine according to claim 1 or 2, characterized in that a through space is formed between the stator coil and the interphase insulating sheet portion in the slot, passing through the slot. [Claim 4] The stator of a rotating electric machine according to claim 1 or 2, characterized in that the shielding portion has a refrigerant guide surface that guides the refrigerant flowing toward the space to the coil end. [Claim 5] The stator of a rotating electric machine according to claim 1, characterized in that the shielding portion is a cover member and is connected to the interphase insulating sheet portion by attaching the cover member to the interphase insulating sheet portion.

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