Stator and method for manufacturing a stator

Abstract

Provided is a stator capable of increasing the possibility that a coil is effectively cooled and capable of reducing the possibility that fixation of the coil to a slot is weakened. The stator is configured to have a stator core that is annular, has a plurality of teeth arranged in a circumferential direction and projecting toward an inner side in a radial direction, and has a plurality of slots formed in the circumferential direction between the teeth; a coil disposed in the slots; and an insulating member formed of resin or rubber, surrounds the coil in the slots, and is fitted to the slots in a press-in state. A groove is formed on an opposite surface of the insulating member that faces a wall surface of the slots, and a space surrounded by an inner surface of the groove and the wall surface of the slots is a flow path for refrigerant.

Description

Technical Field

[0001] This invention relates to a stator and a method for manufacturing the stator. Background Technology

[0002] Previously, a structure was known in which an insulating member was arranged to surround a coil housed in a slot of the stator (see, for example, Patent Document 1). Patent Document 1 describes the formation of a refrigerant flow path between the inner circumferential surface of the insulating member and the coil. Furthermore, Patent Document 1 describes the insulating member having a receiving cavity for interference fit of the coil.

[0003] Patent Document 1: Description of Chinese Utility Model Patent No. 220087028

[0004] In the structure of Patent Document 1, a refrigerant flow path is formed between the inner circumferential surface of the insulating member and the coil. As a result, the contact area between the coil and the insulating member is small, which may lead to a weakening of the coil's fixation to the slot. Summary of the Invention

[0005] The present invention was made in view of the above-mentioned problems, and its object is to provide a stator and a method thereof, which can improve the possibility of the coil being effectively cooled and reduce the possibility of the coil's fixation to the slot becoming weak.

[0006] One embodiment of the stator includes: an annular stator core having a plurality of teeth arranged circumferentially and protruding radially inward, and a plurality of slots formed circumferentially between the teeth; a coil disposed within the slots; and an insulating member formed of resin or rubber, surrounding the coil within the slots and fitting into the slots in a press-fit state; a groove is formed on the opposing surface of the insulating member opposite to the wall of the slot, and the space surrounded by the inner surface of the groove and the wall of the groove is a refrigerant flow path.

[0007] Therefore, a groove is formed on the opposing surface of the insulating member, which is made of resin or rubber, opposite to the wall of the groove, and the space surrounded by the inner surface of the groove and the wall of the groove serves as a flow path for the refrigerant. This increases the likelihood of the coil being effectively cooled. Furthermore, by forming a groove as a flow path on the opposing surface of the insulating member on the wall side of the groove, the contact area between the insulating member and the coil is easily ensured, reducing the possibility of the coil's fixation to the groove weakening.

[0008] One embodiment of the stator manufacturing method includes: a molding step of molding an insulating member formed of resin or rubber and surrounding a coil, thereby integrating the coil and the insulating member; a flow path forming step of providing a refrigerant flow path on the insulating member; and an insertion step of inserting the insulating member and the coil, which are provided with the flow path, into a groove in an annular stator core having a plurality of teeth arranged circumferentially and protruding radially inward and a plurality of grooves formed circumferentially between the teeth.

[0009] Therefore, by molding the resin or rubber insulating component around the coil, the coil and the insulating component are integrated, thus increasing the likelihood that the coil and the insulating component are securely fixed. This reduces the possibility that the coil's fixation to the slot may weaken. Furthermore, since a refrigerant flow path is provided on the insulating component, the likelihood of the coil being effectively cooled is increased. Attached Figure Description

[0010] Figure 1 This is a top view of the stator.

[0011] Figure 2 This is a schematic diagram of the insulating member and coil in the first embodiment viewed from a direction perpendicular to both the axial and radial directions.

[0012] Figure 3 yes Figure 2 A cross-sectional view at line III-III.

[0013] Figure 4 yes Figure 2 A cross-sectional view at line IV-IV.

[0014] Figure 5 yes Figure 2 A cross-sectional view at the VV line.

[0015] Figure 6 It is a three-dimensional diagram of the stator core's flow path, insulating components, and coils.

[0016] Figure 7 This is a flowchart of the stator manufacturing sequence.

[0017] Figure 8 It is a diagram representing a complex number of linear coils.

[0018] Figure 9 This is a top view of the stator core.

[0019] Figure 10 This is a cross-sectional view of the mold.

[0020] Figure 11 It is a side view showing the stator core and the coil end protruding from the stator core.

[0021] Figure 12 This is a schematic diagram of the insulating member and coil in the second embodiment viewed from a direction perpendicular to both the axial and radial directions.

[0022] Figure 13 This is a schematic diagram showing the insulating member and coil in the second embodiment viewed from the radial inside to the radial outside.

[0023] Figure 14 It refers to the cross-section of the slot, coil, and insulating component in the third embodiment that is perpendicular to the axial direction.

[0024] Figure 15 The cross-section of the slot, coil, and insulating member in the third embodiment that is perpendicular to the axial direction is... Figure 14 Cross-sectional views at different axial positions.

[0025] Figure 16 The cross-section of the slot, coil, and insulating member in the third embodiment that is perpendicular to the axial direction is... Figure 14 , Figure 15 Cross-sectional views at different axial positions.

[0026] Figure 17 It refers to the cross-section of the slot, coil, and insulating component in the fourth embodiment that is perpendicular to the axial direction.

[0027] Figure 18 It refers to the cross-section of the slot, coil, and insulating member in the fifth embodiment that is perpendicular to the axial direction.

[0028] Explanation of reference numerals in the attached figures: 1: Stator, 2: Stator core, 2A: Stator core, 21: Core body, 22: Tooth, 23: Slot, 231: Slot side, 232: Slot back, 24: Flow path, 241: Circumferential flow path, 242: Radial flow path, 3: Coil, 4: Insulating component, 4A: Insulating component, 4B: Insulating component, 4C: Insulating component, 4D: Insulating component, 41: Side part, 41a: One side part, 410a: One side part, 411a: One side part, 42: Back part, 421: Back part, 422: Back part, 43: Front part, 44: Groove, 440: Groove, 441: Groove, 442: Groove, 45: Inner side part, 46: Tapered part, 5: Flow path, 100: Mold Detailed Implementation

[0029] Hereinafter, embodiments of the present invention will be described in the following order.

[0030] (1) First implementation: (1-1) Stator structure: (1-2) Stator manufacturing method: (2) Second implementation: (3) Third implementation: (4) Fourth implementation: (5) Fifth implementation: (6) Other implementations: (1) First implementation method: (1-1) Structure of the stator: Figure 1 This is a top view of the stator 1 according to this embodiment. Hereinafter, it will be discussed in conjunction with the center O of the stator core 2, which will be described later. Figure 1 The direction perpendicular to the plane of the paper, that is, parallel to the central axis, is called the axial direction. Furthermore, the direction along the circumference of a circle centered on the central axis is called the circumferential direction, and the direction parallel to the radius of that circle is called the radial direction. Moreover, in the radial direction, the direction closer to the central axis is called the radial inward direction, and the direction farther from the central axis is called the radial outward direction. Figure 2 This is a schematic diagram showing the insulating member 4 and the coil 3 surrounded by the insulating member 4 extracted from this embodiment, and viewed from a direction perpendicular to both the axial and radial directions. Figure 3 yes Figure 2 A cross-sectional view at line III-III. Figure 4 yes Figure 2 A cross-sectional view at line IV-IV. Figure 5 yes Figure 2 A cross-sectional view at the VV line. Furthermore, in Figure 1 , Figure 2 The image shows the state after the portion of coil 3 not housed in stator core 2, i.e., the coil end, has been cut off in a direction perpendicular to the axial direction. Figures 3-5 The diagram also illustrates slot 23. In Figures 2-5 For ease of understanding, slot 23, insulating component 4, coil 3, etc., are schematically shown. Figures 2-5 The shape or size of each part sometimes differs from the actual shape or size.

[0031] Stator 1 is the stator of a rotating electric motor. A rotating electric motor using stator 1 is, for example, a synchronous motor. The rotating electric motor using stator 1 is an internal rotor type. That is, the rotating electric motor has stator 1 and a rotor (not shown) disposed inside stator 1. Stator 1 is a component for forming magnetic poles on teeth 22 (described later), and for forming a rotating magnetic field whose polarity (N pole, S pole) changes over time. The rotor is configured to rotate about the aforementioned central axis. Magnetic poles are formed on the outer periphery of the rotor. The rotor rotates by the interaction of the magnetic poles of the rotor and the magnetic poles of stator 1. Stator 1 and rotor are housed in a housing (not shown).

[0032] The stator 1 has a stator core 2, coils 3, and insulating components 4. The stator core 2 is a ring-shaped component. The stator core 2 is, for example, a laminate formed by stacking a plurality of electromagnet steel plates (e.g., silicon steel plates) that are formed into a generally circular ring shape by stamping along the axial direction. Alternatively, the stator core 2 can also be a pressed powder core formed by stamping magnetic particles. The stator core 2 has: a ring-shaped core body 21; a plurality of teeth 22 arranged circumferentially protruding radially inward from the inner circumference of the core body 21; and a plurality of grooves 23 formed circumferentially between the teeth 22.

[0033] Teeth 22 are formed at constant intervals along the circumferential direction on the entire circumference of the inner circumferential surface of the core body 21. The number of teeth 22 can be various. In this embodiment, the cross-sectional shape of the teeth 22 in the direction perpendicular to the axial direction is the same at any position in the axial direction. Therefore, the teeth 22 are portions that protrude radially inward and extend axially while having the same cross-sectional shape in the direction perpendicular to the axial direction. In addition, each tooth 22 has the same shape as the others. The radially tip of the tooth 22 has a protrusion 221 extending to both sides in the circumferential direction (see reference). Figures 3-5 The protrusions 221 of two adjacent teeth 22 are spaced apart and face each other in the circumferential direction.

[0034] The slot 23 is a space formed circumferentially between the teeth 22 to accommodate the coil 3. A plurality of slots 23 arranged circumferentially have the same shape. The slot 23 extends axially through the stator core 2. An opening is formed on the radially inner side of the slot 23. This opening is formed between two adjacent protrusions 221. The cross-sectional shape of the slot 23 in the direction perpendicular to the axial direction is the same at any position in the axial direction. Furthermore, the central portion of the slot 23 in the axial direction, i.e., the central part, is connected to a refrigerant flow path 242 formed in the stator core 2 (see reference). Figure 3 , Figure 6 The shape of the central portion of groove 23 may also differ from the shape of the portions outside the central portion of groove 23. The aforementioned central position refers to the position where groove 23 is approximately bisected along the axial direction.

[0035] like Figure 3 As shown, the slot 23 includes two side surfaces 231 extending radially when viewed from the axial direction, and a back surface 232 connecting the radially outer ends of the two side surfaces 231. Hereinafter, the side surfaces 231 are sometimes referred to as slot side surfaces. The back surface 232 is sometimes referred to as slot back surface. The slot side surfaces 231 form part of the side surfaces of the tooth 22. The two slot side surfaces 231 are arranged parallel to each other. The slot back surface 232 forms part of the inner circumferential surface of the core body 21. The space enclosed by the two slot side surfaces 231 and the slot back surface 232 is the receiving space of the coil 3. The radial width of the slot side surfaces 231 can be greater than the width between the two slot side surfaces 231, in other words, the width of the slot back surface 232 when viewed from the axial direction.

[0036] The groove 23 has an opening on its radially inner side. The width of this opening, i.e., the width between the protrusions 221 of the teeth 22, is less than the width between the two groove sides 231. Furthermore, the opening on the radially inner side of the groove 23 may be sealed by other components (not shown) or may not be sealed.

[0037] The stator core 2 has a flow path 24 for supplying refrigerant to the axial center of each slot 23 (see reference). Figure 6 ).exist Figure 6 The diagram illustrates a flow path 24 extracted from the stator core 2. The flow path 24 is positioned at the center of the axial direction. The flow path 24 includes a circumferential flow path 241 extending circumferentially. The circumferential flow path 241 includes a first circumferential flow path 241a and a second circumferential flow path 241b positioned at a different axial position from the first circumferential flow path 241a. A plurality of first circumferential flow paths 241a are spaced apart circumferentially. A plurality of second circumferential flow paths 241b are spaced apart circumferentially. The first circumferential flow paths 241a and the second circumferential flow paths 241b are arranged alternately circumferentially. When the stator core 2 is a stack of a plurality of electromagnetic steel plates, the first circumferential flow paths 241a and the second circumferential flow paths 241b are formed from different electromagnetic steel plates.

[0038] The circumferential flow path 241 includes a connecting flow path 241c that connects the first circumferential flow path 241a and the second circumferential flow path 241. The connecting flow path 241c connects the circumferential ends of each circumferential flow path 241a, 242b. The flow path 24 includes a plurality of radial flow paths 242 extending radially from the circumferential flow path 241. The radial flow paths 242 are arranged according to the number of slots 23. Each radial flow path 242 forms an opening in the wall of each slot 23 at its axial central position. In this embodiment, the radial flow path 242 forms an opening on the side 231 of the slot. This opening is only formed at the axial central portion of the slot 23, i.e., it does not extend axially. In addition, the flow path 24 includes a connecting flow path 243 that connects to an external flow path (not shown) and the circumferential flow path 241. As described above, by constructing the flow path 24, it is possible to avoid the stator core 2 being divided into a plurality of parts radially or circumferentially.

[0039] In the space surrounded by the slot side 231 and the slot back 232, a plurality of coils 3 are arranged radially. The number of coils 3 arranged radially is not limited; in this embodiment, it is four. The coils 3 are distributed windings. Each coil 3 includes a receiving portion disposed within the slot 23 and a coil end protruding axially beyond the end face of the stator core 2. The receiving portion of the coil 3 extends linearly along the axial direction. Each coil end is connected to the coil end of another coil 3 housed in a slot 23 by welding or the like. In this embodiment, the coil 3 has a square cross-section, but it can also be a circular cross-section. For example, any one of the three phases of a three-phase AC circuit is connected to each coil 3. Thus, each coil 3 causes each tooth 22 to generate a magnetic pole whose polarity changes over time. The receiving portion of the coil 3 is fixed to the wall of the slot 23 via an insulating member 4.

[0040] The insulating member 4 is provided in each groove 23, and is arranged in the groove 23 in such a way as to surround the receiving portion of the coil 3. In this embodiment, the entire insulating member 4 is formed of the same resin. The insulating member 4 is formed, for example, of a thermoplastic resin, but it may also be formed of a thermosetting resin. The hardness of the insulating member 4 is preferably such that the insulating member 4 will not break when it is pressed axially into the groove 23.

[0041] An insulating member 4 is disposed between the opening on the side 231, back 232, and radially inner side of the slot 23 and the outer peripheral surface of the coil 3. The insulating member 4 is arranged to centrally surround all the coils 3 disposed within a slot 23. Viewed axially, the insulating member 4 is formed into a rectangular frame shape that matches the shape of the slot 23 and the outer peripheral shape of the coil 3. The insulating member 4 has, for example, a length equal to the overall width of the slot 23 in the axial direction, but may also be formed to be longer than the overall width of the slot 23. The width of the cross-section of the insulating member 4 perpendicular to the axial direction is, for example, the same at any position in the axial direction.

[0042] The insulating member 4 includes two side portions 41, a back portion 42, and a front portion 43. Each side portion 41 is positioned opposite to the groove side portion 231. The two side portions 41 are arranged parallel to each other. The back portion 42 is the portion connecting the radially outer ends of each side portion 41, and is positioned opposite to the groove back portion 232. Furthermore, the back portion 42 is positioned radially outward compared to the coil 3. The front portion 43 is the portion connecting the radially inner ends of each side portion 41, and is provided in the radially inner opening of the groove 23, in other words, positioned opposite to the protrusion 221 of the tooth 22. The front portion 43 is positioned radially inner compared to the coil 3.

[0043] The insulating member 4 is pressed into the groove 23. That is, one side portion 41a contacts one groove side portion 231 under pressure. The other side portion 41b contacts another groove side portion 231 under pressure. The back portion 42 contacts the groove back portion 232 under pressure. The front portion 43 contacts the protrusion 221 under pressure. Thus, in this embodiment, the insulating member 4 is in a direction perpendicular to both the axial and radial directions... Figures 3-5 The insulating member 4 is configured to be pressed in both the left and right directions and in the radial direction. However, the insulating member 4 may be configured to be pressed in at least one of the directions perpendicular to both the axial and radial directions, and in the radial direction. "Fitting in a pressed state" means that the insulating member 4 and the coil 3 surrounded by the insulating member 4 are inserted into the slot 23 while applying pressure to the wall of the slot 23 without moving axially relative to the slot 23. In addition, "fitting in a pressed state" means that the fit between the insulating member 4 and the slot 23 is, for example, an interference fit, but as long as the insulating member 4 and the coil 3 are fixed to the slot 23, fits other than an interference fit, such as light pressing, pushing, or driving in intermediate fits, are also included in the concept of "fitting in a pressed state".

[0044] In this embodiment, all of one side portion 41a, except for the groove 44 described later, contacts one groove side portion 231. All of the other side portion 41b contacts another groove side portion 231. All of the back portion 42 contacts the groove back portion 232. However, this is not a limitation; as long as the insulating member 4 is fixed to the wall of the groove 23, a portion of one side portion 41a may contact the groove side portion 231, or a portion of the other side portion 41b may contact the groove side portion 231, or a portion of the back portion 42 may contact the groove back portion 232. Furthermore, the side portions 41 and the back portion 42 directly contact the groove side portion 231 and the groove back portion 232. That is, there is no adhesive or other component between the side portions 41 and the back portion 42 and the groove side portion 231 and the groove back portion 232. However, this is not a limitation; for example, an adhesive may be present between the side portions 41 and the back portion 42 and the groove side portion 231 and the groove back portion 232. That is, in addition to the pressure of pressing, the side portion 41 and the back portion 42 can also be fixed to the side portion 231 and the back portion 232 of the groove using an adhesive.

[0045] The inner circumferential surface of the insulating member 4 on the coil 3 side is fixed to the outer circumferential surface of the coil 3. Specifically, the entire inner circumferential surface of one side portion 41a is fixed to one side of the coil 3. The entire inner circumferential surface of the other side portion 41b is fixed to the other side of the coil 3. The entire inner circumferential surface of the back portion 42 is fixed to the radially outer surface of the coil 3a located at the outermost radial direction. The entire inner circumferential surface of the front portion 43 is fixed to the radially inner surface of the coil 3d located at the innermost radial direction. However, this is not a limitation; the insulating member 4 may be used as long as it can fix four coils 3. As long as it can fix four coils 3, a portion of the inner circumferential surface of one side portion 41a may also be fixed to the outer circumferential surface of the coil 3. In addition, a portion of the inner circumferential surface of the other side portion 41b may also be fixed to the outer circumferential surface of the coil 3. A portion of the inner circumferential surface of the back portion 42 may also be fixed to the outer circumferential surface of the coil 3a. A portion of the inner circumferential surface of the front portion 43 may also be fixed to the outer circumferential surface of the coil 3d.

[0046] A groove 44 is formed on the opposing surface of the insulating member 4, opposite to the wall surface of the groove 23. Specifically, the groove 44 is formed on the opposing surface of a side portion 41a, opposite to the groove side surface 231. In this embodiment, the groove 44 is a bottomed groove between the opposing surface of the side portion 41a (groove side surface 231) and the inner circumferential surface of the coil 3. Figure 2 As shown, the groove 44 is meandering. Specifically, the groove 44 has the following shape: a first portion 44a extending parallel to the axial direction, a second portion 44b extending radially parallel from the end of the first portion 44a, and a third portion 44c extending axially parallel from the end of the second portion 44b that connects to the opposite side of the first portion 44a. When the second portion 44b is taken as a reference, the extension directions of the first portion 44a from the second portion 44b and the extension directions of the third portion 44c from the second portion 44b are opposite to each other. The groove 44 meanders and extends in the axial direction.

[0047] Hereinafter, the coil 3a located radially outermost among the four coils 3 is sometimes referred to as the first coil, the coil 3b located adjacent to the first coil 3a is referred to as the second coil, the coil 3c located adjacent to the second coil 3b is referred to as the third coil, and the coil 3d located adjacent to the third coil 3c is referred to as the fourth coil. Additionally, the direction perpendicular to both the axial and radial directions is sometimes simply referred to as the right-angle direction. For example... Figure 3As shown, the first portion 44a is at least perpendicular to the first coil 3a. In this embodiment, the first portion 44a is arranged to radially span the first coil 3a and the second coil 3b. Specifically, a radial portion of the first portion 44a is perpendicular to a portion of the first coil 3a on the radial side of the second coil 3b. The remaining radial portion of the first portion 44a is perpendicular to a portion of the second coil 3b on the radial side of the first coil 3a. The first portion 44a is not perpendicular to the third coil 3c and the fourth coil 3d.

[0048] like Figure 4 As shown, the second portion 44b is at least perpendicular to the second coil 3b and the third coil 3c. That is, the second portion 44b is arranged to radially span the second coil 3b and the third coil 3c. In this embodiment, the second portion 44b is perpendicular to the entire radial portion of the second coil 3b and the entire radial portion of the third coil 3c. Furthermore, the second portion 44b may also be perpendicular to at least a portion radially of the first coil 3a or at least a portion radially of the fourth coil 3d.

[0049] like Figure 5 As shown, the third portion 44c is at least perpendicular to the fourth coil 3d in a right-angle direction. In this embodiment, the third portion 44c is arranged to radially span the third coil 3c and the fourth coil 3d. Specifically, a radial portion of the third portion 44c is perpendicular to a portion of the fourth coil 3d side of the third coil 3c in a right-angle direction. The remaining radial portion of the third portion 44c is perpendicular to a portion of the third coil 3c side of the fourth coil 3d in a right-angle direction. The third portion 44c is not perpendicular to the first coil 3a and the second coil 3b.

[0050] Thus, the shape formed by the combination of the first part 44a, the second part 44b, and the third part 44c spans the entire coil 3 radially; in other words, it is perpendicular to the entire coil 3 in the right-angle direction. As long as the shape formed by the combination of the first part 44a, the second part 44b, and the third part 44c spans the entire coil 3 radially, the radial width of each of the first part 44a, the second part 44b, and the third part 44c can be arbitrarily set. Furthermore, the interval between two adjacent second parts 44b in the axial direction can also be arbitrarily set. Additionally, the axial widths of the first part 44a, the second part 44b, and the third part 44c can also be arbitrarily set.

[0051] The groove 44 is provided across the entire axial range of the insulating member 4. In this embodiment, as... Figure 2As shown, the first part 44a is connected to both ends of the insulating member 4 in the axial direction. However, it is not limited to this, and the third part 44c may also be connected to at least one end of the insulating member 4 in the axial direction.

[0052] Furthermore, the groove 44 extends axially, and at the midpoint between one end and the other end of the groove 44, there is an inlet 44d for introducing refrigerant from the stator core 2 (see reference). Figure 2 , Figure 3 The guide portion 44d is located at the center of the groove 23, which is approximately bisected axially. The guide portion 44d is connected to the radial flow path 242 of the stator core 2. In this embodiment, the guide portion 44d extends radially along a side portion 41a. Furthermore, the guide portion 44d is formed to penetrate between the surface of the first portion 44a and the surface of the groove back face 232 of the back face portion 42. The guide portion 44d may, for example, be formed as a bottomed groove that does not penetrate between the surface of the groove side face 231 of the side portion 41a and the surface of the coil 3.

[0053] like Figures 3-5 As shown, the space enclosed by the inner surface of the groove 44 and the wall surface of the groove 23, specifically the side surface 231, is the refrigerant flow path 5. The flow path 5 includes a first flow path 5a, a second flow path 5b, and a third flow path 5c. The first flow path 5a is the space enclosed by the inner surface of the first portion 44a and the side surface 231. The second flow path 5b is the space enclosed by the inner surface of the second portion 44b and the side surface 231. The third flow path 5c is the space enclosed by the inner surface of the third portion 44c and the side surface 231. The first flow path 5a extends parallel to the axial direction. The second flow path 5b extends parallel to the radial direction. The third flow path 5c extends parallel to the axial direction. Furthermore, in this embodiment, no refrigerant flow path is provided between the surface of the insulating member 4 on the coil 3 side and the coil 3.

[0054] like Figures 3-5 As shown, a side portion 41a includes an inner side portion 45 disposed radially inward relative to the groove 44. The opposing surface of the inner side portion 45, which faces the groove side portion 231, contacts the groove side portion 231. Specifically, at any axial position where the groove 44 is formed, the side portion 41a includes the inner side portion 45. More specifically, as... Figure 3As shown, the inner side portion 45 includes a first inner side portion 45a, which is positioned radially inward compared to the first portion 44a where the groove 44 is formed, at an axial position. The opposite surface of the first inner side portion 45a to the groove side surface 231 is in contact with the groove side surface 231 at any axial position where the first portion 44a is formed. In this embodiment, the entire radial portion of the first inner side portion 45a is in contact with the groove side surface 231, but it is also possible that only a portion of the radial portion of the first inner side portion 45a is in contact with the groove side surface 231. Furthermore, at the axial position where the first inner side portion 45a is provided, on the opposite surface of the side portion 41a to the groove side surface 231, no other grooves serving as refrigerant flow paths are formed at a position radially inward compared to the first inner side portion 45a.

[0055] like Figure 4 As shown, the inner side portion 45 includes a second inner side portion 45b, which is located radially inward compared to the second portion 44b in the axial position where the groove 44 is formed. The opposite surface of the inner side portion 45b on the groove side 231 side contacts the groove side 231 at any axial position where the second portion 44b is formed. In this embodiment, the entire radial portion of the inner side portion 45b contacts the groove side 231, but it is also possible that only a portion of the inner side portion 45b in the radial direction contacts the groove side 231. Furthermore, in the axial position where the inner side portion 45b is provided, on the opposite surface of the side portion 41a on the groove side 231 side, no other grooves serving as refrigerant flow paths are formed at a position radially inward compared to the inner side portion 45b.

[0056] like Figure 5 As shown, the inner side portion 45 includes a third inner side portion 45c, which is located radially inward compared to the third portion 44c, in the axial position where the groove 44 is formed. The opposite surface of the inner side portion 45c on the groove side 231 side contacts the groove side 231 at any axial position where the third portion 44c is formed. In this embodiment, the entire radial portion of the inner side portion 45c contacts the groove side 231, but it is also possible that only a portion of the radial portion of the inner side portion 45c contacts the groove side 231. Furthermore, in the axial position where the inner side portion 45c is located, on the opposite surface of the side portion 41a on the groove side 231 side, no other grooves serving as refrigerant flow paths are formed at a position radially inward compared to the inner side portion 45c.

[0057] In this way, the inner side portion 45 separates the groove 44 from the space that is radially inner than the coil 3. As a result, the possibility of refrigerant flowing in the groove 44 leaking into the space that is radially inner than the coil 3 can be reduced; in other words, the possibility of leaking to the outside of the stator 1 can be reduced.

[0058] On the other side portion 41b and the front portion 43, no grooves for refrigerant flow paths are formed. On the rear portion 42, no grooves for refrigerant flow paths are formed except for the inlet portion 44d at the axial center position.

[0059] Next, the flow of the refrigerant will be described. Furthermore, the refrigerant can be, for example, lubricating oil, working oil, or other liquids or gases. The refrigerant pumped by a pump (not shown) is cooled by a heat exchanger (not shown) and then supplied to flow path 24 of the stator core 2. The refrigerant supplied to flow path 24 follows... Figure 6 After flowing sequentially through the connecting flow path 243, circumferential flow path 241, and each radial flow path 242, the refrigerant is supplied to the inlet portion 44d of the groove 44 located at the axial center of each groove 23. The refrigerant supplied to the inlet portion 44d is divided into one axial side and the other side, meandering through the first portion 44a, the second portion 44b, and the third portion 44c of the groove 44. Then, the refrigerant flows out from both axial sides toward the outside of the stator core 2. After flowing through an external flow path (not shown), the outflowing refrigerant returns to the pump.

[0060] (1-2) Stator manufacturing method: Next, the manufacturing method of stator 1 will be explained. Figure 7 This is a flowchart showing the manufacturing sequence of stator 1. First, as... Figure 8 As shown, a straight conductor, i.e., coil 30, is prepared as the substrate for coil 3 (step S100). At least one number of coils 30 is prepared (number of coils accommodated in each slot 23) × (number of slots 23). Each coil 30 has an insulating film on its outer peripheral surface. Next, as... Figure 9 As shown, prepare stator core 2 (step S105).

[0061] Next, as Figure 10 As shown, a mold 100 for molding the insulating component 4 is prepared (step S110). Figure 10 The illustrated mold 100 includes an upper mold 101 and a lower mold 102. The upper mold 101 and lower mold 102 form a mold cavity 103 in a closed state. The mold cavity 103 includes an area for arranging four coils 30 and an area for forming an insulating member 4 around that area. Additionally, the surface of the upper mold 101 on the mold cavity 103 side has a protrusion 104 for forming a groove 44. Furthermore, steps S100, S105, and S110 can be performed in any order. Alternatively, step S105 can be performed after step S115, which will be described later.

[0062] Next, the insulating member 4 is formed in a manner that surrounds the coil 30 (step S115). Specifically, the four coils 30 are positioned in the open mold state of the lower mold 102 or the upper mold 101, with their axes parallel to each other and in a direction perpendicular to the axes of the coils 30. Then, the upper mold 101 and the lower mold 102 are closed. Figure 10 The mold is shown in a closed state, with the coils 30 arranged in the mold cavity 103. Then, resin, molten by heating, is filled into the area surrounding the coils 30 in the mold cavity 103. Afterward, the filled resin is cooled and hardened. Then, the upper mold 101 and lower mold 102 are opened. Then, the coils 30 and the surrounding molded resin, i.e., the insulating member 4, are removed from the upper mold 101 or lower mold 102. Thus, an insulating member 4, integral with the four coils 30, having grooves 44 serving as refrigerant flow paths, is formed. The molding of the insulating member 4 is performed at least according to the number of grooves 23. Furthermore, in step S115, simultaneously with the molding of the insulating member 4, the grooves 44 serving as refrigerant flow paths in the insulating member 4 are formed. That is, step S115 corresponds to both the molding step and the flow path formation step. In step S115, the insulating member 4 is molded by injection molding. Additionally, in step S115, the coils 30 and the insulating member 4 are integrated by insert molding.

[0063] Next, the four integrated coils 30 and insulating members 4 are inserted into the slots 23 axially from the stator core 2 (step S120). At this time, the four coils 30 and insulating members 4 are inserted into the slots 23 with the axis of the coils 30 parallel to the axis of the stator core 2. Specifically, the four coils 30 and insulating members 4 are pressed into the slots 23. The fit between the insulating members 4 and the slots 23 is, for example, set to an interference fit. In step S120, four coils 30 and insulating members 4 are inserted into each slot 23. Figure 11 As shown, in the state where the insertion of the coil 30 and the insulating member 4 into the slot 23 is completed, a portion of one end of each coil 30 in the axial direction, namely the first coil end 31, protrudes from one end face of the stator core 2 in the axial direction. Additionally, a portion of the other end of each coil 30 in the axial direction, namely the second coil end 32, protrudes from the other end face of the stator core 2 in the axial direction. Furthermore, step S120 is relative to the insertion step of the present invention.

[0064] Next, each first coil end 31 is bent and connected to other first coil ends 31 protruding from other slots 23 by welding or the like (step S125). Additionally, each second coil end 32 is bent and connected to other second coil ends 32 protruding from other slots 23 by welding or the like (step S125). The coil 30, where the first coil ends 31 are connected to each other and the second coil ends 32 are connected to each other, is the coil 3 of the stator 1.

[0065] The effects of this embodiment will now be explained. According to this embodiment, a groove 44 is formed on the opposite surface of the groove side surface 231 of one side portion 41a of the insulating member 4. The space surrounded by the inner surface of the groove 44 and the groove side surface 231 is the refrigerant flow path 5, thus increasing the likelihood of the coil being effectively cooled. Furthermore, by forming the groove 44 on the opposite surface of the groove side surface 231 of the side portion 41a, the contact area between the insulating member 4 and the coil 3 is easily ensured. This reduces the possibility of the coil 3 becoming weakly fixed to the groove 23. Since the entire coil 3 side surface of the insulating member 4 is fixed to the coil 3, the possibility of the coil 3 moving relative to the insulating member 4 is reduced. Moreover, since the insulating member 4 and the coil 3 are pressed into the groove 23, the possibility of the coil 3 wobbling within the groove 23 is reduced even without the use of an adhesive. Additionally, since the insulating member 4 is formed of resin, the possibility of damage to the insulating member 4 during pressing into the groove 23 is reduced. Furthermore, since the insulating member 4 is formed in a manner that surrounds the coil 3, the possibility of damage to the insulating film of the coil 3 can be reduced. Moreover, in this embodiment, no refrigerant flow path is provided between the coil 3 side surface of the insulating member 4 and the coil 3, thus further reducing the possibility of the coil 3 becoming weakly fixed to the groove 23.

[0066] Since the side portion 41a with the groove 44 faces all the coils 3 into which a slot 23 is inserted, the side portion 41a is cooled by the refrigerant flowing in the groove 44, thus increasing the possibility that more coils 3 can be effectively cooled.

[0067] Furthermore, since groove 44 is a bottomed groove, the contact area between coil 3 and insulating member 4 can be increased. This further reduces the possibility of coil 3 moving relative to insulating member 4, and also further reduces the possibility of coil 3 wobbling within groove 23. Additionally, since groove 44 is a bottomed groove, insulating member 4 can be positioned between groove 44 and coil 3. This increases the likelihood of ensuring insulation between coil 3 and stator core 2.

[0068] Because the groove 44 is meandering, the flow path 5 formed by the groove 44 can be extended, further increasing the possibility that the coil 3 can be effectively cooled. In particular, the groove 44 spans the entire coil 3 in the first part 44a, the second part 44b, and the third part 44c; that is, it is opposite to the entire coil 3 in a direction perpendicular to both the axial and radial directions. Therefore, the possibility that the entire coil 3 can be effectively cooled can be increased. In addition, the direction in which the groove 44 meanders is axial, thus increasing the possibility that the coil 3 can be effectively cooled over a large axial range. The groove 44 is provided over the entire axial range of the insulating member 4, thus further increasing the possibility that the coil 3 can be cooled over a large axial range.

[0069] By meandering through the groove 44, the radial extent of the side portion 41a without the groove 44 can be expanded in a cross-section perpendicular to the axial direction. This increases the likelihood that the coil 3 and the slot 23 can be securely fixed. Furthermore, it increases the likelihood of ensuring insulation between the coil 3 and the stator core 2.

[0070] The groove 44 includes an inlet 44d at a midpoint between one end and the other end in the axial direction for introducing refrigerant from the stator core 2. That is, the refrigerant is supplied to the groove 44 from the midpoint in the axial direction and flows to both sides in the axial direction. Therefore, compared to the case where the refrigerant is supplied to one end of the groove 44 in the axial direction and flows out from the other end, the distance from when the refrigerant is supplied to the groove 44 to when it flows out can be shortened. This reduces the possibility of a large difference in cooling efficiency between the coils 3 at different axial positions.

[0071] (2) Second implementation method: Next, the description will focus on the differences between the second embodiment and the first embodiment of the present invention. Figure 12 A schematic diagram is shown when viewing the insulating member 4A and coil 3 of this embodiment from a direction perpendicular to both the axial and radial directions. Figure 13 A schematic diagram showing the insulating member 4A and coil 3 of this embodiment as viewed from the radially inner side to the radially outer side is shown. Figure 12 , Figure 13 In this embodiment, the same reference numerals are used to denote the same structures as in the first embodiment, and descriptions are omitted where appropriate. The insulating member 4A in this embodiment differs from the insulating member 4 in the first embodiment. The stator in this embodiment, except for the insulating member 4A, is constructed in the same manner as the stator 1 in the first embodiment. Furthermore, the stator in this embodiment is manufactured in the same order as the stator 1 in the first embodiment.

[0072] The insulating member 4A has a tapered portion 46 at its axially oriented tip. The tapered portion 46 is provided on both sides along the axial direction. The surface of the insulating member 4 opposite to the side where the coil 3 is located is taken as the outer surface, such as... Figure 12 As shown, in the tapered portion 46, the width between the outer surface 46a facing the radially inward side and the outer surface 46b facing the radially outward side gradually decreases towards the apex in the axial direction. The outer surfaces 46a and 46b are formed as surfaces inclined relative to the axial direction. Furthermore, the outer surface 46b is the surface on the back side of the groove. The outer surface 46a is the surface on the opening side of the radially inward side of the groove.

[0073] The direction perpendicular to both the axial and radial directions is defined as the right-angle direction, such as... Figure 13 As shown, in the tapered portion 46, the width between the outer surface 46c facing the right angle direction and the outer surface 46d facing the other right angle direction gradually decreases towards the apex in the axial direction. The outer surfaces 46c and 46d are formed as surfaces inclined relative to the axial direction. Furthermore, outer surface 46c is a groove-side surface, and outer surface 46d is another groove-side surface. The insulating member 4A, except for the tapered portion 46, is constructed in the same manner as the insulating member 4 of the first embodiment.

[0074] In addition to achieving the same effects as the first embodiment, this embodiment provides a tapered portion 46 on the axial top end side of the insulating member 4A, thus facilitating the insertion of the insulating member 4A into the groove. The tapered portion 46 is provided on both sides axially, therefore, insertion of the insulating member 4A into the groove is easy regardless of which side of the insulating member 4A is inserted from. Figure 12 When viewed from the opposite direction, the tapered portion 46 is formed into a pointed shape, thus facilitating the insertion of the back and front portions of the insulating member 4A into the groove. Furthermore, even when viewed from... Figure 13 When viewed from the opposite direction, the tapered portion 46 is also formed into a pointed shape, thus making it easy to insert the two side portions of the insulating member 4A into the groove.

[0075] Furthermore, the tapered portion 46 may also be formed only on one side of the insulating member 4A in the axial direction. In this case, the insulating member 4A can be inserted into the groove from the side where the tapered portion 46 is formed. Alternatively, the tapered portion 46 may also be formed, for example, from... Figure 12 When viewed from the direction of the object, it forms a pointed shape. Figure 13 When viewed from the direction of the cone, it does not form a pointed shape. The tapered portion 46 can also, for example, be located from... Figure 13 When viewed from the direction of the object, it forms a pointed shape. Figure 12 It does not form a pointed shape when viewed from the opposite direction. Additionally, Figure 12 One of the outer surfaces 46a and 46b can be formed as a surface inclined relative to the axial direction, and the other can be formed as a surface parallel to the axial direction. Additionally, Figure 13 One of the outer surfaces 46c and 46d can be formed as a surface inclined relative to the axial direction, while the other can be formed as a surface parallel to the axial direction.

[0076] (3) Third implementation method: Next, the description will focus on the parts of the third embodiment of the present invention that differ from the first and second embodiments. Figures 14-16 This is a cross-sectional view of the slot 23, coil 3, and insulating member 4B of this embodiment, perpendicular to the axial direction. Figures 14-16 These are sectional views at different positions along the axial direction. Figures 14-16 In this document, the same reference numerals are used to mark the same structures in the first and second embodiments, and descriptions are omitted as appropriate.

[0077] The insulating member 4B of the stator in this embodiment differs from the insulating member 4 of the first embodiment, but is otherwise the same as the first embodiment. Furthermore, the stator of this embodiment is manufactured in the same order as the stator 1 of the first embodiment. The insulating member 4B includes a side portion 410a opposite to a slot side surface 231. A groove 440 is formed on the opposite surface of the side portion 410a opposite to the slot side surface 231. The groove 440 is formed as a through groove penetrating between the surface of the insulating member 4B on the slot side surface 231 and the surface on the coil 3 side. That is, the outer peripheral surface of the coil 3 is exposed within the groove 440. The space surrounded by the inner surface of the groove 440, the slot side surface 231, and the outer peripheral surface of the coil 3 is the refrigerant flow path. The groove 440 differs from the groove 44 of the first embodiment in that it is formed as a through groove, but is otherwise formed in the same manner as the groove 44.

[0078] Specifically, the groove 440 is meandering. The groove 440 has the following shape: a first portion 440a extending parallel to the axial direction (see reference). Figure 14 The second part 440b extends radially parallel from the end of the first part 440a. Figure 15 (Refer to) and a third part 440c (refer to) extending axially parallel from the end of the second part 440b that connects to the opposite side of the first part 440a. Figure 16 The shape repeats along the axial direction. The first part 440a, the second part 440b, and the third part 440c are each formed as a through groove.

[0079] The groove 440 includes an inlet portion 440d at its central position in the axial direction (see reference). Figure 14 The inlet portion 440d introduces refrigerant from the radial flow path 242 of the stator core 2. The inlet portion 440d is formed, for example, as a through groove between the surface of the groove side 231 of the side portion 410a and the surface of the coil 3, but it can also be formed as a non-through bottomed groove. The insulating member 4B, except for the groove 440, is constructed in the same way as the insulating member 4 of the first embodiment.

[0080] In this embodiment, in addition to achieving the same effects as in the first and second embodiments, since the groove 440 is configured as a through groove, the refrigerant flowing in the groove 440 can directly contact the coil 3. Furthermore, the flow path surrounded by the inner surface and side surface 231 of the groove 440 can be increased. Therefore, the possibility of effectively cooling the coil 3 can be further improved.

[0081] (4) Fourth implementation method: Next, the description will focus on the parts of the fourth embodiment of the present invention that differ from the first to third embodiments. Figure 17 This is a cross-sectional view perpendicular to the axial direction of the slot 23, coil 3, and insulating member 4C in this embodiment. Figure 17 In this embodiment, the same reference numerals are used to denote structures identical to those in the first to third embodiments, and descriptions are omitted where appropriate. The insulating member 4C and stator core 2A of the stator in this embodiment differ from the insulating member 4 and stator core 2 of the first embodiment, but are otherwise identical to those in the first embodiment. Furthermore, the stator in this embodiment is manufactured in the same order as the stator 1 of the first embodiment.

[0082] The insulating member 4C includes a back portion 421 opposite to the back surface 232 of the groove. A groove 441 is formed on the opposing surface of the back portion 421 opposite to the back surface 232 of the groove. The groove 441 is formed as a bottomed groove between the surface of the back portion 421 on the side of the back surface 232 of the groove and the surface on the side of the coil 3. The space surrounded by the inner surface of the groove 441 and the back surface 232 of the groove is the flow path of the refrigerant. The groove 441 extends axially, specifically, for example, in a manner that it extends axially through the insulating member 4C. The cross-sectional shape of the groove 441, which is perpendicular to the axial direction, is the same at any position in the axial direction, but it can also vary along the axial direction. In addition, the groove 441 can also be meandering, for example.

[0083] The insulating member 4C includes two side portions 411a and 411b opposite to the groove side surface 231. No grooves for refrigerant flow paths are formed in each side portion 411a and 411b. The side portions 411a and 411b function entirely as inner side portions located radially inward compared to the groove 441. The opposing surfaces of the side portions 411a and 411b opposite to the groove side surface 231 contact the groove side surface 231. The groove 441 and the space radially inward compared to the coil 3 are separated by the side portions 411a and 411b. This reduces the possibility of refrigerant flowing in the groove 441 leaking into the space radially inward compared to the coil 3; in other words, it reduces the possibility of leakage to the outside of the stator. The insulating member 4C is constructed similarly to the insulating member 4 of the first embodiment, except as described above.

[0084] The stator core 2A includes a flow path 245 for supplying refrigerant to the trench 441. The flow path 245 is connected to the trench 441 at a midpoint between one end and the other end of the trench 441 along its axial direction. The flow path 245 and the trench 441 are connected at a central position that roughly bisects the stator core 2A along its axial direction. The portion of the trench 441 facing the flow path 245 functions as an inlet for introducing refrigerant from the stator core 2A. The stator core 2A is configured similarly to the stator core 2 of the first embodiment, except as described above.

[0085] In this embodiment, in addition to achieving the same effects as in the first to third embodiments, the groove 441, which serves as the refrigerant flow path, is provided on the back surface portion 421, which is radially outer compared to the coil 3. Therefore, the possibility of refrigerant flowing in the groove 441 leaking into the space radially inner compared to the coil 3 can be further reduced. Furthermore, since the groove 441 is a bottomed groove, the contact area between the coil 3 and the insulating member 4C can be increased. This further reduces the possibility of the coil 3 moving relative to the insulating member 4C, and consequently further reduces the possibility of the coil 3 wobbling within the groove 23. Additionally, since the groove 441 is a bottomed groove, the insulating member 4C can be positioned between the groove 441 and the coil 3. This improves the likelihood of ensuring insulation between the coil 3 and the stator core 2A.

[0086] (5) Fifth implementation method: Next, the description will focus on the differences between the fifth embodiment of the present invention and the first to fourth embodiments. Figure 18 This is a cross-sectional view perpendicular to the axial direction of the slot 23, coil 3, and insulating member 4D in this embodiment. Figure 18 In this embodiment, the same reference numerals are used for structures identical to those in the first to fourth embodiments, and descriptions are omitted where appropriate. The insulating member 4D and stator core 2A of the stator in this embodiment differ from the insulating member 4 and stator core 2 of the first embodiment, but are otherwise identical to those in the first embodiment. Furthermore, the stator in this embodiment is manufactured in the same order as the stator 1 of the first embodiment.

[0087] This embodiment is a variation of the fourth embodiment. Specifically, the groove 442, which serves as a refrigerant flow path, formed on the back surface portion 422 of the insulating member 4D, is configured as a through groove extending between the surface of the back surface portion 422 on the back side 232 and the surface on the coil 3 side. The coil 3 is exposed within the groove 442. Except for the groove 442, the insulating member 4D is configured in the same manner as the insulating member 4C of the fourth embodiment. The stator core 2A is configured in the same manner as the stator core 2A of the fourth embodiment.

[0088] In this embodiment, in addition to achieving the same effects as in the first to fourth embodiments, since the groove 442 is a through groove, the refrigerant flowing in the groove 442 can directly contact the coil 3. Furthermore, the flow path surrounded by the inner surface of the groove 442 and the back surface 232 of the groove can be increased. Therefore, the possibility of the coil 3 being effectively cooled can be improved.

[0089] (6) Other implementation methods

[0090] In the above embodiment, an example is shown where refrigerant is supplied into the groove from the central position in the axial direction. However, this is not a limitation; refrigerant may also be supplied into the groove, i.e., the groove of the insulating member, from an intermediate position other than the central position between one end and the other end in the axial direction of the stator core. That is, the inlet portion of the groove for introducing refrigerant from the stator core may also be provided at an intermediate position other than the central position between one end and the other end in the axial direction of the groove. Alternatively, refrigerant may be supplied into the groove of the insulating member from one end side of the stator core, allowing the refrigerant to flow out from the other end side of the stator core.

[0091] The stator core is simply an annular component having a plurality of teeth arranged circumferentially and a plurality of slots formed between the teeth circumferentially. That is, the stator core has a plurality of slots formed by a plurality of teeth, and a coil is arranged in each slot. Furthermore, it is sufficient that the rotor can rotate relative to the stator through the interaction between the magnetic field formed by the coil and the magnetic field formed by the rotor. Alternatively, it is sufficient that the change in the magnetic field generated by the rotor rotation induces a current in the stator wiring. The number of poles, the number of slots, and the material of the stator core can be various. The slot sides may not be parallel to the radial direction of the stator core. In this case, the side portion of the insulating member may also not be parallel to the radial direction.

[0092] The stator core can be ring-shaped as a whole. The shapes of the radially inner and radially outer faces of the ring formed by the stator core are not limited. For example, when viewed axially, the radially outer face can be circular or polygonal. Teeth are formed on the radially inner face, and grooves are formed between the teeth. In the stator core, the general shape including the teeth can be considered ring-shaped, and the portion other than the teeth can be considered ring-shaped. Furthermore, the stator of the present invention can be applied to a type of rotating electrical machine, namely an electric motor, or to a generator.

[0093] Insulating components can also be made of rubber. In this case, in Figure 7 In step S115, rubber (synthetic rubber or natural rubber) may be filled around the coil embedded in the mold cavity.

[0094] The groove only needs to be formed on the opposing surface of the insulating member, opposite to the wall of the groove. The shape of the groove is not limited. The groove does not need to be meandering. In this case, the groove may, for example, extend linearly along the axial direction on the side surface of the insulating member. Furthermore, Figure 2 The first portion 44a or the third portion 44c of the groove 44 may also extend in a manner that displaces radially as it advances axially. Similarly, the second portion 44b of the groove 44 may also extend in a manner that displaces axially as it advances radially. Figure 14 The first part 440a of the groove 440 or Figure 16 The third part 440c can also extend in a radially displaced manner as it advances along the axial direction. Figure 15 The second part 400b can also extend in a manner that displaces axially as it advances radially.

[0095] The grooves of the insulating member can also be formed in a plurality of separate parts. For example, a plurality of grooves, opposite to and separate from each of a plurality of coils, can be formed on the side surface of the insulating member. In this case, the plurality of grooves can extend axially. Each of the plurality of grooves serves as a flow path for the refrigerant. A flow path for supplying refrigerant to each of the plurality of grooves is formed on the stator core. Furthermore, if the grooves of the insulating member are meandering, the direction in which the grooves extend while meandering can also be radial. The grooves of the insulating member can also be provided on both the two side surfaces. The grooves can also be provided on both the side surfaces and the back surface.

[0096] The grooves in the insulating member may also be formed only in a portion of the axial direction of the insulating member. In this case, refrigerant flow paths can be formed on the stator core that connect to both ends of the axial direction of the grooves in the insulating member.

[0097] The insulating member is formed of resin or rubber and is positioned to surround the coil within a groove. The resin or rubber insulating member can also be positioned to surround the coil by methods other than integral molding with the coil. For example, a frame-shaped insulating member can be formed first, and then the coil can be inserted into the inside of the frame-shaped insulating member. In this case, the fit between the insulating member and the coil can be set to a loose fit that does not damage the insulating film of the coil. In this case, the insulating member and the coil can also be fixed, for example, with an adhesive.

[0098] Furthermore, in the stator manufacturing method of the present invention, the step of inserting the integrated insulating member and coil into the slot can also be a step without pressing in the insulating member and coil. That is, the fitting of the slot with the insulating member and coil can be a gap fitting or a middle fitting. In this case, the insulating member and the slot can also be fixed using an adhesive, for example.

[0099] Additionally, for example, if the space inside the groove that is radially inner than the coil is set as the refrigerant flow path, the groove formed in the insulating member as the refrigerant flow path can also be connected to the space (flow path) that is radially inner than the coil.

[0100] Furthermore, in the above embodiment, an example was shown where the molding step of forming an insulating member made of resin or rubber and surrounding the coil, integrating the coil and the insulating member, and the flow path forming step of providing a flow path for the refrigerant on the insulating member, are the same step. However, this is not a limitation; the flow path forming step may also be performed after the molding step. In this case, in the molding step, an insulating member without grooves serving as flow paths is formed around the coil. Then, in the flow path forming step, grooves serving as flow paths are formed on the insulating member. In this case, the grooves may also be formed by any method, such as cutting the insulating member.

[0101] Furthermore, in the stator manufacturing method of the present invention, the flow path forming step only requires providing a refrigerant flow path on an insulating member formed in a manner that surrounds the coil. That is, the shape of the flow path provided in the flow path forming step or the position of the flow path in the insulating member is not limited. For example, a groove serving as a refrigerant flow path may also be provided on the coil-side surface of the insulating member. This groove may also be a bottomed groove that does not penetrate between the groove wall side surface of the insulating member and the coil-side surface.

Claims

1. A stator, wherein, have: The annular stator core has a plurality of teeth arranged circumferentially and protruding radially inward, and a plurality of grooves formed circumferentially between the teeth; The coil is disposed within the slot; as well as An insulating member, formed of resin or rubber, surrounds the coil within the groove and is pressed into the groove; A groove is formed on the opposite surface of the insulating member that is opposite to the wall surface of the groove. The space enclosed by the inner surface of the groove and the wall of the groove is the refrigerant flow path.

2. The stator according to claim 1, wherein, The wall of the slot includes a side surface extending radially along the stator core and a back surface connecting the radially outer ends of the side surface. The groove is provided on the side portion of the insulating member opposite to the side of the groove or on the back portion of the insulating member opposite to the back of the groove.

3. The stator according to claim 1, wherein, The wall of the slot includes a side surface extending radially along the stator core. The insulating member includes a side portion opposite to the side of the trench. The side portion includes an inner side portion disposed radially inward compared to the groove. The opposing surface of the inner side of the side contactes the side of the groove.

4. The stator according to claim 1, wherein, The trench is winding.

5. The stator according to claim 1, wherein, The groove extends axially and includes an inlet at a midpoint between one end and the other end of the groove, the inlet introducing refrigerant from the stator core.

6. The stator according to claim 1, wherein, The side of the insulating member opposite to the side where the coil is located is taken as the outer surface. The width between the outer surface facing the radially inner side of the axial top end of the insulating member and the outer surface facing the radially outer side gradually decreases towards the axial top end of the insulating member.

7. A method for manufacturing a stator, in, include: The molding step involves molding an insulating component made of resin or rubber that surrounds the coil, thereby integrating the coil and the insulating component. The flow path forming step involves providing a refrigerant flow path on the insulating member; and In the insertion step, the insulating member and the coil, which are provided with the flow path, are inserted into the slot in the annular stator core having a plurality of teeth arranged circumferentially and protruding radially inward and a plurality of slots formed circumferentially between the teeth.

8. The method for manufacturing a stator according to claim 7, wherein, The insertion step is the step of pressing the insulating member and the coil into the groove.

Images