Stator and method for manufacturing stator

Abstract

The present invention addresses the problem of providing a stator in which an insulating member such as a stator winding, an insulating paper, or a resin mold can be stably fixed at a fixed position without the risk of refrigerant leakage. In order to solve the problem, a stator is provided with: a stator core (6) having a plurality of slots (7) arranged in the circumferential direction so as to extend in the radial direction; a stator winding (9) to which conductors (8) each housed in the plurality of slots (7) and having a rectangular cross-section are electrically connected, the stator winding (9) being disposed on the stator core (6); an insulating member (11) disposed along the inner wall surface (10) of each of the plurality of slots (7); and a slot-side refrigerant flow path (22) that forms a hole section (21) that communicates with the radially outer end section of each of the plurality of slots (7) and through which a refrigerant can flow. In the slot-side refrigerant flow path 22, the width W1 in the circumferential direction of a communication boundary portion 23 where the radially innermost side of the void portion 21 communicates with the radially outer end of the slot 7 is narrower than the width W2 in the circumferential direction of the slot 7.

Description

Technical Field

[0001] The present invention relates to a stator in a rotating electrical machine and a method for manufacturing the stator. Background Art

[0002] The stator of a rotating electric machine generates heat due to copper loss and iron loss. Therefore, a method of cooling the stator by circulating a refrigerant in the stator is sometimes adopted. Regarding this method, there is a proposal as follows: a refrigerant channel for passing a refrigerant such as cooling water is arranged in a free space arranged radially outside the slot, thereby effectively cooling the stator core or stator winding (Patent Document 1: Paragraph

[0185] , Figure 50).

[0003] [Prior Technical Literature]

[0004] (Patent Document)

[0005] Patent Document 1: Japanese Patent Application Publication No. 2022-74588 Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] However, in the method disclosed in Patent Document 1, since the slot and the coolant passage have the same width, insulating members such as stator windings, insulating paper, or resin molds cannot be stably fixed in fixed positions, and further, problems such as coolant leakage are worrying.

[0008] An object of the present invention is to provide a stator and a method for manufacturing the stator, which can stably fix insulating components such as stator windings, insulating paper or resin molds in fixed positions without the risk of refrigerant leakage.

[0009] [Technical means to solve the problem]

[0010] (1) The stator of the present disclosure (e.g., stator 3 described below) includes: a stator core (e.g., stator core 6 described below) having a plurality of slots (e.g., slots 7 described below) arranged in the circumferential direction in a radially extending manner; a stator winding (e.g., stator winding 9 described below) electrically connected to conductors (e.g., conductor 8 described below) respectively received in the plurality of slots and having a rectangular cross section, and arranged on the stator core; an insulating member (e.g., insulating member 11 described below) extending along the inner wall surface (e.g., inner wall surface) of each of the plurality of slots; , the inner wall surface 10 described below is configured; and, the slot side refrigerant flow path (for example, the slot side refrigerant flow path 22 described below) forms a pore portion (for example, the pore portion 21 described below), and the pore portion is connected to the radial outer end portions of each of the aforementioned multiple slots and can allow refrigerant to flow; and the circumferential width of the connecting boundary portion (for example, the connecting boundary portion 23 described below) where the radial innermost side of the aforementioned pore portion in the aforementioned slot side refrigerant flow path is connected to the radial outer end portion of the aforementioned slot is narrower than the circumferential width of the aforementioned slot.

[0011] (2) The stator according to (1) above, wherein the width of the aperture in the circumferential direction is constant from the communication boundary portion toward the radially outer side.

[0012] (3) The stator according to (1) above, wherein the width of the hole portion in the circumferential direction narrows from the communication boundary portion toward the radially outer side.

[0013] (4) A stator according to (1) above, wherein the stator further includes: a first groove (for example, the first groove 26a described below), which is formed in a groove shape on the outer periphery of the stator and allows the refrigerant to flow in the circumferential direction; and a second groove (for example, 26b described below), which extends radially inward from the first groove in the stator; and the pore portion includes: a first pore portion (for example, the first pore portion 21a described below), which extends radially outward from the connecting boundary portion and is located radially inside the second groove; and a second pore portion (for example, the second pore portion 21b described below), which extends radially outward from the connecting boundary portion and is longer than the first pore portion.

[0014] (5) A stator according to (4) above, wherein the stator is formed by laminating steel plates (for example, the laminated steel plates 27, 28, 29, 30 described below) formed by laminating steel plates, the laminated steel plates being a first laminated steel plate (for example, the first end side laminated steel plate 29 described below, the second end side laminated steel plate 30 described below) and a second laminated steel plate (for example, the central portion laminated steel plate 29 of the first phase described below, the central portion laminated steel plate 30 of the second phase described below), the first laminated steel plate (for example, the first end side laminated steel plate 29 described below, the second end side laminated steel plate 30 described below) being formed into a shape having a portion corresponding to the first aperture portion, and the second laminated steel plate (for example, the central portion laminated steel plate 29 of the first phase described below, the central portion laminated steel plate 30 of the second phase described below) being formed into a shape having portions corresponding to the first groove, the second groove, the first aperture portion, and the second aperture portion, respectively.

[0015] (6) A method for manufacturing a stator, which is a method for manufacturing a stator according to any one of (1) to (5) above, characterized in that it comprises: a thermoplastic resin curing step (S1) of filling the aforementioned pore portion with a thermoplastic resin and curing the same; a winding configuration step (S2) of configuring the aforementioned stator winding on the aforementioned stator core by radially laminating a plurality of aforementioned conductors in the aforementioned slot; a thermosetting resin curing step (S3) of inserting a thermosetting resin molding material for fixing the configured aforementioned stator winding in the aforementioned slot and curing the same; and a thermoplastic resin melting step (S4) of melting the thermoplastic resin.

[0016] (Effects of the Invention)

[0017] In the stator of (1) above, a step portion is formed at a communicating boundary portion between a pore portion connected to the radial outer end of each slot and through which the refrigerant can flow, and the slot, wherein the pore portion has a circumferential width narrower than the circumferential width of the slot. Therefore, the insulating member arranged along the inner wall surface of each slot is prevented from moving by the step portion, thereby being reliably fixed deep in the slot. In addition, the refrigerant is sealed by the step portion being in contact with the stator winding via the insulating member at the step portion and its vicinity. Thus, a refrigerant flow path without refrigerant leakage is formed. As a result, the refrigerant reliably circulates in the pore portion and directly cools the stator winding, so that the stator winding is well cooled.

[0018] In the stator of (2) above, the width of the hole portion in the circumferential direction is constant from the communication boundary portion toward the radially outer side. Therefore, the cross-sectional area of ​​the coolant flow path can be sufficiently ensured, thereby improving the cooling performance.

[0019] In the stator of (3) above, the width of the aperture in the circumferential direction narrows from the connected boundary portion to the radially outer side. Therefore, the magnetic lines of force passing through the vicinity of the aperture can pass through the nearby magnetic circuit, thereby reducing the loss of magnetic energy in the stator core. As a result, the performance of the rotating electric machine using the stator can be improved.

[0020] The stator of (4) above further includes: a first slot formed in a slot shape on the outer periphery of the stator and allowing the refrigerant to circumferentially flow; and a second slot extending radially inward from the first slot in the stator; and the pore portion includes: a first pore portion extending radially outward from the connecting boundary portion and located radially inward of the second slot; and a second pore portion extending radially outward from the connecting boundary portion longer than the first pore portion. Therefore, the refrigerant flow path that passes through the second slot from the first slot and is connected to the second pore portion and the first pore portion is formed by connecting the overlapping parts of the position phase generated by the rotational lamination of the laminated steel plates. As a result, the refrigerant can reliably circulate in the circulation path, thereby being able to directly cool the stator winding.

[0021] In the stator of (5) above, steel plates preformed into shapes having portions corresponding to the first slot, the second slot, the first aperture, and the second aperture are used as steel plates constituting the laminated steel plates, and the stator core is formed as a laminate of these steel plates. Therefore, a complex refrigerant flow path from the outer peripheral side of the stator core to the inside reaching the slots can be easily formed.

[0022] In the manufacturing method of the stator of (6) above, in the thermoplastic resin curing step (S1), the pore portion of (1) above is filled with a thermoplastic resin and cured. In the winding configuration step (S2), the stator winding is configured on the stator core in a manner that a plurality of conductors are radially laminated in the slot of (1) above. In the thermosetting resin curing step (S3), a thermosetting resin molding material for fixing the stator winding accommodated is inserted into the slot and cured. In the thermoplastic resin melting step (S4), the thermoplastic resin of (S1) is melted. By means of the steps (S1) to (S4), the pore portion constituting the refrigerant flow path is filled with a thermoplastic resin or a thermoplastic resin after insert molding, and the stator winding is fixed by curing the resin molding material, and then the thermoplastic resin is completely melted to produce the pore portion. Therefore, no additional jig or the like is required, and only one thermal process is required, thereby providing an easy manufacturing method. Furthermore, energy consumption can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram showing a rotating electric machine having a stator of the present disclosure.

[0024] Figure 2 Schematic diagram showing a stator core, slots, stator windings, and gaps in a stator according to one aspect of the present disclosure.

[0025] Figure 3 Yes Description Figure 2 A diagram showing the dimensional relationship between the slots, stator windings and apertures in a stator.

[0026] Figure 4 This is a schematic diagram showing a refrigerant flow path in a stator according to one aspect of the present disclosure.

[0027] Figure 5 This is a diagram showing the arrangement of slots, stator windings, and gaps in the circumferential direction in a stator according to one aspect of the present disclosure developed in a linear form.

[0028] Figure 6 This is an enlarged view showing the relationship between the first slot, the second slot, and the void portion in the stator of the present disclosure.

[0029] Figure 7 It is a schematic diagram for explaining the connection between the rotation lamination of the laminated steel plates and the coolant flow path.

[0030] Figure 8 Schematic diagram showing a stator core, slots, stator windings, and apertures in a stator according to another aspect of the present disclosure.

[0031] Fig. 9 Yes Description Figure 2 Diagram of the magnetic field lines around the slots, stator windings and apertures in a stator.

[0032] Fig.10 Yes Description Figure 8 Diagram of the magnetic field lines around the slots, stator windings and apertures in a stator.

[0033] Fig.11 This is a diagram showing the relationship between first slots, second slots, and voids in a portion of laminated steel plates in a stator according to another aspect of the present disclosure.

[0034] Fig.12 Schematic diagram showing a stator core, slots, stator windings, and gaps in a stator according to another aspect of the present disclosure.

[0035] Fig.13 This is a flow chart showing one aspect of the method for manufacturing a stator of the present disclosure.

[0036] Fig.14 1 is a flow chart showing another aspect of the method for manufacturing a stator according to the present disclosure.

[0037] Fig.15 This is a flow chart showing another aspect of the method for manufacturing a stator of the present disclosure.

[0038] Fig.16A is shown with Fig.14A diagram of a portion of a process corresponding to a flowchart.

[0039] Fig. 16B is shown with Fig.14 A diagram of a portion of a process corresponding to a flowchart.

[0040] Fig. 16C is shown with Fig.14 A diagram of a portion of a process corresponding to a flowchart.

[0041] Fig.16D is shown with Fig.14 A diagram of a portion of a process corresponding to a flowchart.

[0042] Fig.16E is shown with Fig.14 A diagram of a portion of a process corresponding to a flowchart. DETAILED DESCRIPTION

[0043] Hereinafter, the stator of the present disclosure will be described with reference to the drawings. In each of the following drawings, the same reference numerals are given to corresponding parts. Figure 1 is a schematic diagram showing a rotating electric machine having a stator of the present disclosure. Figure 2 Schematic diagram showing a stator core, slots, stator windings, and gaps in a stator according to one aspect of the present disclosure. Figure 3 Yes Description Figure 2 A diagram showing the relationship between the dimensions of the slots, stator windings and apertures in a stator. Figure 1 In the embodiment, the rotary electric machine 1 includes a rotor 2 and a stator 3. The rotor 2 is cylindrical, and the stator 3 having a ring-shaped cross section is arranged around the rotor 2 at a predetermined interval.

[0044] A housing 4 forming the outer shell of the rotating electrical machine 1 is provided in contact with the outer periphery of the stator 3. A rotating shaft 5 passes through the rotation center of the rotor 2, and the rotating shaft 5 is supported by bearings (not shown) at both ends of the housing 4 in the axial direction. A plurality of slots 7 are arranged in parallel at equal intervals in the stator core 6 in the annular stator 3. Figure 2 , the arrangement of the plurality of slots 7 in the circumferential direction is expanded into a straight line and schematically represented. Conductors 8 having a rectangular cross section are respectively accommodated in the plurality of slots 7. The conductors 8 are electrically connected to form a stator winding 9 arranged on the stator core 6. An insulating member 11 is arranged along the inner wall surface 10 of each of the plurality of slots 7. As the insulating member 11, insulating paper or a resin molding material or the like is applied.

[0045] Figure 1The rotating electric machine 1 schematically shown in the figure generates heat due to copper loss and iron loss, but is cooled by the refrigerant circulating in the refrigerant flow path 12 formed in the stator 3 as described below. The refrigerant flowing out from the refrigerant storage section 13 provided on the housing 4 is supplied to the suction side of the pump 15 through the filter 14. The refrigerant is cooled by exchanging heat with the refrigerant flowing in the external refrigerant flow path 17 using a heat exchanger 16 provided on the delivery side of the pump 15, and is supplied to the refrigerant supply port 19 of the stator core 6 through the refrigerant supply path 18. The refrigerant supplied to the stator core 6 cools the stator core 6 and the conductor 8 in the slot 7 using the following path, and at the same time flows in the following manner and is recovered to the refrigerant storage section 13, and is repeatedly recycled.

[0046] refer to Figure 2 and Figure 3 , a slot side coolant flow path 22 is provided which is connected to the outer end 20 of each slot 7 in the radial direction to form a pore portion 21. Here, the radial innermost opening of the pore portion 21 in the slot side coolant flow path 22 which is connected to the outer end 20 of the slot 7 is referred to as a connection boundary portion 23. The width W of the pore portion 21 in the circumferential direction is 1 From the communication boundary portion 23 to the radially outer side (at Figure 2 , Figure 3 The width W of the slot 7 in the circumferential direction is constant. 2 Narrow. Since the width W of the aperture 21 in the circumferential direction 1 Since the cross-sectional area is constant from the communication boundary portion 23 toward the radially outer side, a sufficient cross-sectional area of ​​the slot-side coolant flow path 22 can be ensured, thereby improving the cooling performance.

[0047] When Figure 2 and Figure 3 In the example of the slot side refrigerant flow path 22, the width W of the connecting boundary portion 23 in the circumferential direction is 1 , that is, the width W of the pore portion 21 in the connected boundary portion 23 in the circumferential direction 1 is the width W of the slot 7 in the circumferential direction 2 The width d is narrowed inward from the two opposite inner wall surfaces 10 of the slot 7. 1 Here, the conductor 8 with a rectangular cross section, that is, the width W of the stator winding 9 in the circumferential direction is 3 The width W of the slot 7 in the circumferential direction 2 but is larger than the circumferential width W of the connected boundary portion 23. 1 That is, the width W of the stator winding 9 in the circumferential direction is 3 From the two opposite inner wall surfaces 10 (width W 1 ) are radially wider outward by a width d 2 .

[0048] In other words, the width W of the communication boundary portion 23 in the pore portion 21 forming the slot-side coolant flow path 22 in the circumferential direction is 1 Than the width W of the stator winding 9 in the slot 7 in the circumferential direction 3 Therefore, a stopper st is formed around the connecting boundary portion 23 in the slot side refrigerant flow path 22 (pore portion 21) as a stopper st at the radial outer end relative to the stator winding 9 falling into the slot 7 (reference Figure 2 Therefore, the insulating member 11 is restricted from moving by the step portion, and is thus reliably fixed to the radially outer side of the slot 7 (at the Figure 2 , Figure 3 In addition, the step portion functions as a portion for sealing the slot 7 and the slot-side coolant flow path 22. Therefore, a slot-side coolant flow path 22 without coolant leakage is realized. Therefore, the coolant reliably flows in the slot-side coolant flow path 22, so that the stator winding 9 can be directly cooled, and the cooling efficiency of the stator winding 9 and the stator 3 is good.

[0049] Figure 4 Schematic diagram showing a refrigerant flow path in a stator according to one aspect of the present disclosure. Figure 4 In the embodiment, a partial cross-sectional perspective view of the stator 3 is used as a reference. Figure 1 The coolant flow path 12 of the stator 3 is described. The coolant flow path 12 includes an outer peripheral coolant flow path 24, a slot side coolant flow path 22, and a connecting coolant flow path 25 that connects the outer peripheral coolant flow path 24 and the slot side coolant flow path 22. The outer peripheral coolant flow path 24 is formed to surround the axial center position on the outer periphery of the stator 3 in a circumferential direction.

[0050] That is, the entire circumference of the radially outer open side of the slot 26 formed so as to surround the outer circumference of the stator 3 is covered by the housing 4 (refer to Figure 1 ) is closed, thereby forming the outer circumferential side coolant flow path 24. Specifically, the outer circumferential side coolant flow path 24 is formed in the following manner, that is, as described below, the central laminated steel plates 27 of the first phase and the central laminated steel plates 28 of the second phase, which have the same shape and whose circumferential phase positions (hereinafter, appropriately referred to as phases) are offset by rotational lamination, overlap in the axial direction. As a result, the outer circumferential side coolant flow path 24 is formed in a zigzag shape around the outer circumference of the stator 3.

[0051] Here, “rotation lamination” means that when a plurality of laminated steel sheets formed by pressing or the like are further laminated in the axial direction to constitute the stator core 6 , the plurality of laminated steel sheets are laminated while shifting their phase positions in the circumferential direction.

[0052] A first end side laminated steel plate 29 is arranged on the first end side of the first phase central laminated steel plate 27 on the side opposite to the second phase central laminated steel plate 28 in the axial direction. Furthermore, a second end side laminated steel plate 30 is arranged on the second end side of the second phase central laminated steel plate 28 on the side opposite to the first end side laminated steel plate 29 in the axial direction. That is, the first end side laminated steel plate 29, the first phase central laminated steel plate 27, the second phase central laminated steel plate 28, and the second end side laminated steel plate 30 are overlapped in the axial direction from the first end side to the second end side in the above order, thereby constituting the stator core 6.

[0053] In another embodiment, the coolant flow path 25 is connected to a plurality of second grooves 26b in the groove 26 formed in a manner surrounding the outer circumference of the stator 3 (see Figure 6 ), the plurality of second grooves 26b are relatively narrow and deep extending radially inward from the bottom of the first groove 26a, and the first groove 26a is relatively wide and shallow surrounding the outer circumference of the stator 3. The connecting coolant flow path 25 is further connected to the second pore portion 21b (reference Figure 6 ), the second pore portion 21b extends from the plurality of second grooves 26b longer than the first pore portion 21a, and the first pore portion 21a extends from the connecting boundary portion 23 (reference Figure 3 ) extends radially outward and is located radially inward of the second groove 26b.

[0054] As a result, as shown by the hollow arrow A, the refrigerant is supplied from the refrigerant supply port 19 (refer to Figure 1 ) The refrigerant RF supplied to the first groove 26a surrounding the outer circumference of the stator 3 flows into the slot-side refrigerant flow path 22 formed by the first pore portion 21a through the connecting refrigerant flow path 25, and the connecting refrigerant flow path 25 passes through the second groove 26b, the second pore portion 21b, and the first pore portion 21a respectively arranged at multiple positions on the outer circumference. The refrigerant RF flowing in the slot-side refrigerant flow path 22 in each axial front and rear direction (first end direction, second end direction) is discharged and dripped from the axial front and rear ends of the stator core 6 and flows into the refrigerant storage portion 13 (reference Figure 1 ) and is recovered in the manner described above.

[0055] The refrigerant flow path 12 including the outer peripheral side refrigerant flow path 24, the slot side refrigerant flow path 22 and the connecting refrigerant flow path 25 is formed by rotating and laminating the first end side laminated steel plate 29, the first phase central portion laminated steel plate 27, the second phase central portion laminated steel plate 28 and the second end side laminated steel plate 30 constituting the stator core 6 in the above order from the first end side to the second end side in the above order. Figure 5 , Figure 6 and Figure 7The situation of this formation will be described.

[0056] Figure 5 Schematic diagram showing the arrangement of the slots 7, stator windings 9 and refrigerant flow paths 12 in the stator 3 in the circumferential direction in a straight line. Figure 5 , the direction perpendicular to the paper surface is the axial direction of the rotating electrical machine 1 . Figure 6 The invention shows that a plurality of laminated steel plates are rotated and laminated to form a Figure 5 Schematic diagram of the situation of the stator 3. Figure 6 This is an enlarged view showing the relationship between the first groove 26a, the second groove 26b and each part of the coolant flow path 12 in the central laminated steel plate 27 of the first phase of the stator 3. Figure 6 Although the case of the central laminated steel plate 27 of the first phase is shown, the central laminated steel plate 28 of the second phase having the same shape is also the same.

[0057] Figure 5 The central single-point chain line DL and Figure 4 The hollow arrow A in corresponds to the position indicated by the hollow arrow A. Figure 5 middle, Figure 4 The central laminated steel plate 27 of the first phase and the central laminated steel plate 28 of the second phase are marked as strips at the second and third rows from the top, respectively. Figure 5 In FIG. 1 , the first end side laminated steel plate 29 is marked as a strip at the first row from the upper side, and further, the second end side laminated steel plate 30 is marked as a strip at the fourth row from the upper side. Figure 5 In the figure, the marks "U", "V", and "W" are used to distinguish the slots 7 corresponding to the U phase, V phase, and W phase of the three-phase AC of the stator winding 9 (therefore, they are used to distinguish the stator winding 9). There are two slots 7 for each phase of the U phase, V phase, and W phase.

[0058] The central laminated steel plate 27 of the first phase has the same shape as the central laminated steel plate 28 of the second phase, and is circumferentially ( Figure 5 The phases of the central laminated steel plates 27 of the first phase and the central laminated steel plates 28 of the second phase (marked as left and right directions) are offset by a displacement amount ps corresponding to the amounts of the three phases U phase, V phase, and W phase and overlap in the axial direction. As a result, the portions of the first grooves 26a that extend in the circumferential direction exceeding the displacement amount ps in each of the central laminated steel plates 27 of the first phase and the central laminated steel plates 28 of the second phase overlap with each other in the axial direction to form a connecting portion Cm. Therefore, the first grooves 26a of each of the central laminated steel plates 27 of the first phase and the central laminated steel plates 28 of the second phase constitute an outer peripheral side refrigerant flow path 24 (reference) that is interconnected in the axial direction through the connecting portion Cm and is zigzag-shapedly connected in the circumferential direction. Figure 4 ).

[0059] like Figure 6As shown in the enlarged view, the first groove 26a is connected to the first groove 26a along the circumferential direction ( Figure 6 The bottom portion extending in the radial direction (marked in the left and right directions) is relatively narrow and extends radially inward ( Figure 6 The circumferential positions of the second grooves 26b correspond to the circumferential positions of the first apertures 21a of the slots 7 arranged in the circumferential direction. The radially outermost ends of the first apertures 21a do not reach the radially innermost ends of the second grooves 26b, and there is a certain interval.

[0060] In another embodiment, the slots 7 of the central laminated steel plate 27 of the first phase where the second grooves 26b are not intermittently arranged in the circumferential direction are provided with a plurality of slots 26a extending radially outward from the first aperture 21a. Figure 6 The second pore portion 21b is further extended (marked as upward) by the slot 7. There is a relationship of having a radially repeated position repeating portion OV between the portion near the radial outer end of each of the second pore portions 21b and the portion near the radial inner end of the second groove 26b. Therefore, each second groove 26b of the central laminated steel plate 27 of the first phase and each second pore portion 21b of the central laminated steel plate 28 of the second phase are axially connected to each other through the repeating portion OV. Similarly, each second groove 26b of the central laminated steel plate 28 of the second phase and each second pore portion 21b of the central laminated steel plate 27 of the first phase are axially connected to each other through the repeating portion OV. In addition, a reference is formed between the slot 7 and the first pore portion 21a, and between the slot 7 and the second pore portion 21b. Figure 2 and Figure 3 The step portion (refer to Figure 6 ).

[0061] Here, each second pore portion 21b of the central laminated steel plate 27 of the first phase is axially connected to the first pore portion 21a of the central laminated steel plate 28 of the second phase, the first end side laminated steel plate 29, and the second end side laminated steel plate 30. Similarly, each second pore portion 21b of the central laminated steel plate 28 of the second phase is axially connected to the first pore portion 21a of the central laminated steel plate 27 of the first phase, the first end side laminated steel plate 29, and the second end side laminated steel plate 30. As described above, the plurality of first pore portions 21a formed in parallel in the circumferential direction in a manner connected in the axial direction are respectively formed. Figure 4 The slot side refrigerant flow path 22.

[0062] refer to Figure 7 The schematic diagram further illustrates the relationship between the rotational lamination of the laminated steel plates and the connection form of the refrigerant flow path. Figure 7In the figure, the first end side laminated steel plate 29 is represented as "A1", the second end side laminated steel plate 30 is represented as "A2", the central part laminated steel plate 27 of the first phase is represented as "B1", and the central part laminated steel plate 28 of the second phase is represented as "B2". Figure 7 In FIG. 1 , the strip-shaped marks extending left and right along the first, third, and fourth rows from the top schematically show the state in which the shape of the stator core 6 observed in a cross section perpendicular to the axis is unfolded into a straight line. Figure 7 In FIG. 1 , the strip-shaped mark extending left and right along the second row from the upper side schematically shows a state where a shape estimated radially from the outside near the axial center position of the stator core 6 is developed into a straight line.

[0063] exist Figure 7 The first row from the top marked as "the overlapping part of the refrigerant flow path of A1 and B1 in the radial direction" is the radial inner part of the second pore portion 21b of "B1" of the laminated steel plate 27 in the central part of the first phase (in Figure 6 , Figure 7 The lower portion in the middle) is connected to the first hole portion 21a of "A1" of the first end side laminated steel plate 29 in the axial direction.

[0064] exist Figure 7 The portion marked as "the overlapping portion of the peripheral side refrigerant flow path of B1 and B2" in the second row from the top is the vicinity of the circumferential ends of the first groove 26a of the outer periphery of "B1" of the central laminated steel plate 27 of the first phase (at Figure 6 , Figure 7 The vicinity of the left and right ends in the middle) is connected in the axial direction with the vicinity of the circumferential ends of the first groove 26a on the outer periphery of "B2" of the central laminated steel plate 28 of the second phase.

[0065] exist Figure 7 The third row from the top marked as "the overlapping part of the refrigerant flow path of B1 and B2 in the radial direction" is the radial inner end of the second groove 26b of "B1" of the laminated steel plate 27 in the central part of the first phase (in Figure 5 , Figure 7 The radially outer end vicinity of the second pore portion 21b of the laminated steel plate "B2" 28 is the central portion of the second phase (in Figure 5 , Figure 7 The middle part is near the upper end) and is connected in the axial direction.

[0066] exist Figure 7 The portion marked as "the overlapping portion of the refrigerant flow path of A2 and B2 in the radial direction" on the fourth row from the top is the radial inner portion of the second pore portion 21b of "B2" of the central laminated steel plate 28 of the second phase (in Figure 6 , Figure 7 The lower portion in the middle) is connected to the first hole portion 21a of "A2" of the second end side laminated steel plate 30 in the axial direction.

[0067] As per reference Figure 5 , Figure 6 and Figure 7 As can be understood from the description, the refrigerant flow path (connected refrigerant flow path 25) that is connected to the second aperture portion 21b and the first aperture portion 21a from the first slot 26a through the second slot 26b is formed by connecting the overlapping parts of the position phases generated by the rotational lamination of the laminated steel plates (27, 28, 29, 30). As a result, the refrigerant RF reliably circulates in the circulation path (slot side refrigerant flow path 22), thereby being able to directly cool the stator winding 9. Therefore, the cooling efficiency of the stator winding 9 is high.

[0068] Next, refer to Figure 8 Another aspect of the stator of the present disclosure will be described. Figure 8 Schematic diagram showing a stator core, slots, stator windings and apertures in a stator according to another aspect of the present disclosure. Figure 8 In, with Figure 2 and Figure 3 The corresponding parts are marked with the same symbols, and the description of these corresponding parts refers to Figure 2 and Figure 3 Instructions in Figure 8 In the state of Figure 2 and Figure 3 The difference between the two embodiments is that the width of the pore portion 21 in the circumferential direction increases from the connecting boundary portion 23 to the radially outer side (in Figure 8 However, in Figure 8 In the embodiment, the width of the pore portion 21 at the communicating boundary portion 23 in the circumferential direction is relative to the width of the slot 7 in the circumferential direction, and the width d is narrowed inward from the two opposite inner wall surfaces 10 of the slot 7. 1 After the size.

[0069] Fig. 9 Yes Description Figure 2 and Figure 3 FIG. 4 is a diagram showing the shape of magnetic lines of force ML generated inside the stator core 6 in the state of FIG. Fig.10 Yes Description Figure 8 FIG. 1 is a diagram showing the shape of the magnetic field lines ML generated inside the stator core 6 in the state of FIG. Fig. 9 and Fig.10 As shown in FIG. 1 , in the stator core 6, the magnetic force lines ML pass through a position which is separated from the outer periphery of the hole portion 21 serving as the slot-side coolant flow path 22 by a distance ds in the normal direction. Fig. 9 (Right now, Figure 2 and Figure 3), if the circumferential width is constant within the range of the height (radial distance) h1 from the connecting boundary portion 23 to the radially outer side to the outer peripheral end, the magnetic field lines ML that avoid the pore portion 21 become relatively long. Fig.10 If the width of the pore portion 21 in the circumferential direction narrows from the connecting boundary portion 23 to the radially outer side, then relative to Fig. 9 In the embodiment of the present invention, the magnetic lines of force ML passing through the vicinity of the aperture 21 can pass through the vicinity of the magnetic path, thereby reducing the loss of magnetic energy in the stator 6. Thus, the performance of the rotating electrical machine 1 using the stator 6 can be improved.

[0070] Fig.11 Schematic diagram showing the relationship between the first slot, the second slot and the pore portion of a portion of laminated steel plates in a stator according to another aspect of the present disclosure. Fig.11 , the central laminated steel plate 27 of the first phase in the stator core is shown, but as mentioned above, the central laminated steel plate 28 of the second phase also has the same shape as the central laminated steel plate 27 of the first phase. Fig.11 In, with Figure 6 The corresponding parts are marked with the same symbols, and the description of these corresponding parts refers to Figure 6 Instructions in Fig.11 In the state of Figure 6 The difference is that the widths of the first pore portion 21a and the second pore portion 21b in the circumferential direction are the same as the width of the slot 7 at the communicating boundary portion 23 in the circumferential direction. Fig.11 In the embodiment of the present invention, the central laminated steel plate 27 of the first phase itself does not have Figure 6 The step portion in which the stopper st in the embodiment functions.

[0071] However, a reference is provided on the first end side laminated steel plate 29 which is laminated adjacent to the center portion laminated steel plate 27 of the first phase in the axial direction. Figure 2 The same is true for the relationship between the central laminated steel plate 28 of the second phase and the second end laminated steel plate 30 laminated adjacent thereto in the axial direction. Fig.11 The first pore portion 21a and the second pore portion 21b of the first phase central laminated steel plate 27 in the first phase, when viewed in the axial direction (direction perpendicular to the paper), the step portion that functions as a stopper st of the first end side laminated steel plate 29 adjacent in the axial direction exists in the depth direction as a portion narrower than the circumferential width of the slot 7. On the other hand, the stator winding 9 is a conductor 8 having a certain rigidity. Therefore, the step portion that functions as a stopper st of the first end side laminated steel plate 29 also has a certain rigidity. Fig.11The stator winding 9 in the first gap portion 21 a and the second gap portion 21 b of the laminated steel plate 27 in the center of the first phase plays a role in limiting the position in the radial direction.

[0072] Fig.12 Schematic diagram showing a stator core, slots, stator windings, and gaps in a stator according to another aspect of the present disclosure. Fig.12 The upper portion of FIG. 1 is a diagram showing the arrangement of the slots 7 , the stator winding 9 , and the first gap portions 21 a in the first end-side laminated steel plate 29 of the stator core 6 in the circumferential direction, which are developed in a straight line. Fig.12 The lower part shows the rotational lamination state of the first end-side laminated steel plate 29 shown in the upper part when viewed in the direction of arrow OD.

[0073] exist Fig.12 In the stator of the state, blocks are rotated and laminated to form the first end side laminated steel plate 29, and the block is formed by laminating electromagnetic steel plates of the same shape with three forms of first pore portions 21a. For the sake of convenience, the block formed by laminating these electromagnetic steel plates of the same shape is also called the first end side laminated steel plate 29. Corresponding to every two slots of each phase U, V, and W of the three-phase AC, the phase position corresponding to U in the circumferential direction is called the first phase, the phase position corresponding to V is called the second phase, and the phase position corresponding to W is called the third phase. Fig.12 , the first end side laminated steel plate 29 of the first phase is represented as "AP1", the first end side laminated steel plate 29 of the second phase is represented as "AP2", and the first end side laminated steel plate 29 of the third phase is represented as "AP3".

[0074] Here, the three forms of the first aperture portion 21a refer to the aperture portion having a narrower width relative to the slot in the circumferential direction being located at the outer end of the slot (at the Fig.12 The left position (in the upper part) Fig.12 The full width of the slot is equal to the width of the circumference of the aperture (in Fig.12 The narrower hole portion relative to the slot width in the circumferential direction is located at the outer end of the slot (in Fig.12 The right position of the right shape (in Fig.12 There are three types:

[0075] In the electromagnetic steel sheet constituting the first end side laminated steel sheet 29, the Fig.12In the left-right direction of the rotating motor, the pores of the left-hand side, the pores of the full width, the pores of the right-hand side, and the pores of the full width are arranged in sequence. In the axial direction of the rotating motor, the first end side laminated steel plate 29 is rotationally laminated in the order of "AP1", "AP2", "AP3", "AP2", "AP1", and "AP2". By this rotational lamination, when the pores are observed along the axial direction, as shown in FIG. Fig.12 As in the lower side portion, a pore portion having a narrower width in the circumferential direction is intermittently present in each of the rotating laminated blocks adjacent in the axial direction.

[0076] At the outer end of each slot, the portion formed by connecting these circumferentially narrow apertures constitutes a step portion functioning as a stopper st. That is, for the stator winding 9, which is a conductor 8 having a certain rigidity, these axially intermittently existing step portions functioning as stoppers st limit the radial position of the stator winding 9 in the first aperture 21a.

[0077] Next, refer to Fig.13 An aspect of a method for manufacturing a stator according to the present disclosure will be described. Fig.13 1 is a flow chart showing one aspect of the method for manufacturing a stator disclosed in the present invention. Figures 2 to 8 As described, the first phase central laminated steel plate 27, the second phase central laminated steel plate 28, the first end side laminated steel plate 29 and the second end side laminated steel plate 30 formed by electromagnetic steel plates stamped into the shape of the stator 3 are rotationally laminated to form the stator core 6 (step S11).

[0078] Next, insulating paper as an insulating member 11 is inserted into each slot 7 of the stator core 6 formed in step S11 (step S12), and the stator winding 9 is inserted into each slot 7 insulated on the inner circumferential surface 10 (step S13). Next, varnish is impregnated into each slot 7 containing the insulating paper and the stator winding 9 (step S14), and the varnish is heated to solidify (step S15). After the varnish is solidified in step S15, the entire stator core 6 is cooled (step S16), thereby completing the stator 3 in which the stator winding 9 is normally retained in each slot 7 of the stator core 6. In the above-mentioned step S13, a step portion that functions as a stopper st is formed between the outer circumferential side end of each slot 7 and the hole portion 21, so that the normal position and posture of the stator winding 9 are stable, thereby manufacturing a stator 3 with excellent quality.

[0079] refer to Fig.14 and FIG. 16A to FIG. 16E Another aspect of the method for manufacturing a stator according to the present disclosure will be described. Fig.14 1 is a flow chart showing another aspect of the method for manufacturing a stator according to the present disclosure. FIG. 16A to FIG. 16E is shown with Fig.14 The flowchart corresponds to a part of the process. First, as referenced Figures 2 to 8 As described above, the first phase central laminated steel plate 27, the second phase central laminated steel plate 28, the first end side laminated steel plate 29, and the second end side laminated steel plate 30 formed of electromagnetic steel plates punched into the shape of the stator 3 are rotationally laminated to form the stator core 6 (step S21). In step S21, the stator core 6 is prepared as follows. Fig.16A The stator core 6 is formed by connecting the gap portion 21 to the outer peripheral side end portion of the slot 7.

[0080] Next, the thermoplastic resin 201 molded to match the shape of the hole portion 21 is inserted and fixed to the hole portion 21 (the first hole portion 21 and the second hole portion 21b) connected to the radial outer end of each slot 7 of the stator core 6 formed in step S21 (step S22). In step S22, the stator core 6 is Fig. 16B The state shown is a state in which the gap portion 21 connected to the outer peripheral end portion of each slot 7 is filled with the thermoplastic resin 201.

[0081] exist Fig. 16B The stator winding 9 is inserted into each slot 7 of the stator core 6 in the state of being inserted in step S23. The thermosetting resin 202 is injected into the gap between the inner wall surface 10 of each slot 7 and the stator winding 9 in the state of being inserted in step S23 to mold the insulating member 11 (step S24). The thermosetting resin 202 molded in step S24 is heated to a predetermined temperature T 2 And solidify it (step S25). Fig. 16C 2 shows the stator core 6 in the state from step S23 to step S25.

[0082] Here, the temperature T 2 In step S25, after the thermosetting resin as the insulating member 11 is sufficiently cured, the temperature T 2 The temperature in the high range, that is, the temperature T 1 Above T 3 Next, the thermoplastic resin inserted into the hole portion 21 in step S22 is heated to be melted (step S26). Here, the temperature T 1 is the curing temperature of thermoplastic resin, temperature T 3 is the allowable temperature of the stator winding 9. Fig.16D 2 shows the stator core 6 in the process of step S26.

[0083] The thermoplastic resin melted in step S26 is removed (step S27), and the entire stator core 6 is cooled (step S28), thereby completing the process of normally holding the stator winding 9 in each slot 7 of the stator core 6. Fig.16E The stator 3 shown. In the above step S22, the gaps 21 connected to the outer peripheral ends of the slots 7 are filled with thermoplastic resin. Therefore, even when the step portion functioning as the stopper st is not formed, the normal position and posture of the stator winding 9 are stable, thereby manufacturing a stator 3 with excellent quality. In addition, it is recommended to select a resin with high thermal conductivity as the thermosetting resin 202 as the insulating member 11. This is to promote heat dissipation of the stator winding 9 and obtain good cooling efficiency.

[0084] Fig.15 This is a flowchart showing another aspect of the method for manufacturing the stator. Fig.14 Step S21 in the method for manufacturing a stator Fig.15 Step S301 in the method for manufacturing a stator is Fig.14 Step S21 in the method for manufacturing the stator is similarly a process for forming the stator core 6 by rotational lamination of laminated steel sheets. Fig.15 The steps S307 to S312 in the stator manufacturing method are performed in the same order as Fig.14 The steps S23 to S28 in the stator manufacturing method of are directly corresponding. Fig.14 In step S22 of the stator manufacturing method, the thermoplastic resin 201 prepared in advance is inserted into the pores 21 respectively, but the difference is that, Fig.15 The method for manufacturing the stator is to fill the thermoplastic resin 201 into the pore portion 21 using a dedicated jig.

[0085] exist Fig.15 In the manufacturing method of the stator, for the stator core 6 prepared in step S301, in step S302, a special jig for guiding the thermoplastic resin 201 into the pore portion 21 is set in each slot 7 (step S302), and the thermoplastic resin 201 is filled in the pore portion 21 (step S303). Then, the temperature T 1 Above T 3 Next, the thermoplastic resin 201 filled in the pores 21 is heated to solidify (step S304). Then, the thermoplastic resin 201 is cooled to a temperature T 2 Next (step S305), the jig installed in step S302 is removed (step S306). When the process of step S306 is completed, the stator core 6 becomes Fig. 16B In the state shown in FIG. 1 , the pores 21 connected to the outer peripheral ends of the slots 7 are filled with the thermoplastic resin 201. Fig.14 Afterwards, as described above, each process from step S307 to step S312 is performed in the same order as Fig.14 The process corresponds to step S23 to step S28 in the stator manufacturing method.

[0086] That is, in Fig. 16B The stator winding 9 is inserted into each slot 7 of the stator core 6 in the state of being inserted in step S307 (step S307). The thermosetting resin 202 is injected into the gap between the inner wall surface 10 of each slot 7 and the stator winding 9 in the state where the stator winding 9 has been inserted in step S307 to mold the insulating member 11 (step S308). The thermosetting resin 202 molded in step S308 is heated to a predetermined temperature T 2 The solidification is carried out (S309). Fig. 16C 2 shows the stator core 6 in the state from step S307 to step S309.

[0087] Here, the temperature T 2 In step S309, after the thermosetting resin of the insulating member 11 is fully cured, the temperature T 2 The temperature in the high range, that is, the temperature T 1 Above T 3 Next, the thermoplastic resin filled into the pores 21 in step S303 and solidified in step S304 is heated and melted (step S310). Here, the temperature T 1 is the curing temperature of thermoplastic resin, temperature T 3 is the allowable temperature of the stator winding 9. Fig.16D The stator core 6 is shown in the process of step S310.

[0088] The molten thermoplastic resin in step S310 is removed (step S311), and the entire stator core 6 is cooled (step S312), thereby completing the process of normally holding the stator winding 9 in each slot 7 of the stator core 6. Fig.16E The stator 3 shown. In the process of the above-mentioned steps S303 to S304, the gaps 21 connected to the outer peripheral ends of each slot 7 are filled with thermoplastic resin. Therefore, even when the step portion functioning as the stopper st is not formed, the normal position and posture of the stator winding 9 are stable, thereby manufacturing a stator 3 with excellent quality. In addition, it is recommended to select a resin with high thermal conductivity as the thermosetting resin 202 as the insulating member 11. This is to promote heat dissipation of the stator winding 9 and obtain good cooling efficiency.

[0089] Here, in the method for manufacturing a stator of the present disclosure, Fig.15Steps S303 and S304 correspond to a thermoplastic resin curing step (S1) of filling the pores with thermoplastic resin and curing the thermoplastic resin. In addition, step S307 corresponds to a winding arrangement step (S2) of arranging the stator winding 9 on the stator core 6 in a manner of laminating a plurality of conductors (stator windings 9) in the radial direction in the slots 7. In addition, steps S308 and S309 correspond to a thermosetting resin curing step (S3) of inserting a thermosetting resin molding material (thermosetting resin 202) for fixing the arranged stator winding 9 in the slots 7 and curing the thermosetting resin. Furthermore, step S310 corresponds to a thermoplastic resin melting step (S4) of melting the thermoplastic resin.

[0090] The stators and stator manufacturing methods of the various aspects of the present disclosure can be summarized as follows.

[0091] (1) A stator 3 of one aspect of the present disclosure includes: a stator core 6 having a plurality of slots 7 arranged circumferentially in a radially extending form; a stator winding 9 electrically connected to conductors 8 respectively received in the plurality of slots 7 and having a rectangular cross-section, and arranged on the stator core 6; an insulating member 11 arranged along the inner wall surface 10 of each of the plurality of slots 7; and a slot-side coolant flow path 22 forming a pore portion 21, wherein the pore portion 21 is connected to the radial outer end of each of the plurality of slots 7 and allows coolant to flow; and a circumferential width W of a connecting boundary portion 23 where the radial innermost side of the pore portion 21 in the slot-side coolant flow path 22 is connected to the radial outer end of the slot 7 1 Than the slot width W in the circumferential direction 2 narrow.

[0092] In the stator 3 of the above-mentioned embodiment (1), the aperture 21 connected to the radial outer end of each slot 7 and through which the refrigerant RF flows is formed with a circumferential width W of the aperture 21. 1 Than the width W of the slot 7 in the circumferential direction 2 The step portion is narrow and functions as a stopper st. Therefore, the insulating member 11 arranged along the inner wall surface 10 of each slot 7 is prevented from moving by the step portion, so that it is reliably fixed in the depth of the slot 7. In addition, the step portion is in contact with the stator winding 9 through the insulating member 1 at the step portion and its vicinity, thereby sealing the refrigerant RF. As a result, a refrigerant flow path 12 (slot side refrigerant flow path 22) without refrigerant leakage is formed. As a result, the refrigerant RF reliably circulates in the pore portion 21 and directly cools the stator winding 9, so that the cooling efficiency of the stator winding 9 is high.

[0093] (2) In the stator 3 of one aspect of the present disclosure, the width W of the aperture 21 in the circumferential direction is 1 From the communication boundary portion 23 to the radially outer side, the constant ( Figure 2 , Figure 3 , Fig. 9 ).

[0094] In the stator 3 of the above-mentioned aspect (2), the width W of the aperture 21 in the circumferential direction is 1 Since the cross-sectional area is constant from the communication boundary portion 23 toward the radially outer side, a sufficient cross-sectional area of ​​the coolant flow path 12 (slot-side coolant flow path 22 ) can be ensured, and the cooling performance can be improved.

[0095] (3) In the stator 3 of one aspect of the present disclosure, the width W of the aperture 21 in the circumferential direction is 1 The connection boundary portion 23 is narrowed radially outward ( Figure 8 , Fig.10 ).

[0096] In the stator 3 of (3) above, the width W of the aperture 21 in the circumferential direction is 1 Since the gap 21 is narrowed radially outward from the communication boundary portion 23, the magnetic lines of force ML passing through the vicinity of the gap 21 can pass through the vicinity of the magnetic path, thereby reducing the loss of magnetic energy in the stator core 6. Thus, the performance of the rotating electrical machine 1 using the stator 3 can be improved.

[0097] In one aspect of the present disclosure, the stator 3 further includes: a first slot 26a formed in a slot shape on the outer periphery of the stator 3 (stator core 6) and allowing the refrigerant to flow in the circumferential direction; and a second slot 26b extending radially inward from the first slot 26a in the stator core 6; and the pore portion 21 includes: a first pore portion 21a extending radially outward from the connecting boundary portion 23 and located radially inward of the second slot 26b; and a second pore portion 21b extending radially outward from the connecting boundary portion 23 and being longer than the first pore portion 21a ( Figure 6 ).

[0098] In the stator 3 of (4) above, the refrigerant flow path 12 (connecting refrigerant flow path 25) that connects the second aperture portion 21b and the first aperture portion 21a from the first slot 26a through the second slot 26b is formed by connecting the overlapping parts of the position phases generated by the rotational lamination of the laminated steel plates (the central laminated steel plate 27 of the first phase and the central laminated steel plate 28 of the second phase). As a result, the refrigerant RF can reliably circulate in the circulation path, and can directly cool the stator winding 9, thereby improving the cooling performance.

[0099] (5) A manufacturing method of a stator 3 according to one aspect of the present disclosure includes: a thermoplastic resin curing step (S1), in which a thermoplastic resin 201 is filled into the pore portion 21 and cured; a winding configuration step (S2), in which a stator winding 9 is configured on the stator core 6 by radially laminating a plurality of conductors 8 in the slot 7; a thermosetting resin curing step (S3), in which a thermosetting resin molding material (thermosetting resin 202) for fixing the configured stator winding 9 is inserted into the slot 77 and cured; and a thermoplastic resin melting step (S4), in which the thermoplastic resin 201 is melted.

[0100] In the manufacturing method of the stator of the above (5), in the thermoplastic resin curing step (S1), the pore portion of the above (1) is filled with a thermoplastic resin and cured. In the winding configuration step (S2), the stator winding is configured on the stator core in a manner that a plurality of conductors are radially laminated in the slot of the above (1). In the thermosetting resin curing step (S3), a thermosetting resin molding material for fixing the stator winding stored is inserted into the slot and cured. In the thermoplastic resin melting step (S4), the thermoplastic resin of (S1) is melted. Through the steps (S1) to (S4), the thermoplastic resin 201 or the thermoplastic resin 201 after insert molding is filled into the pore portion 21 constituting the slot side coolant flow path 22, and the stator winding 9 is fixed by the resin molding material through its curing, and then the thermoplastic resin 201 is completely melted to produce the pore portion 21. Therefore, no additional jig or the like is required, and only one heat process is required, thereby providing an easy manufacturing method. In addition, energy consumption can be suppressed.

[0101] The above describes one aspect of the stator of the present disclosure, but the technical concept of the present disclosure is not limited thereto. The structure of the details can also be appropriately changed within the scope of the technical concept of the present disclosure. For example, the open side of the first groove 26a in the central laminated steel plate 27 of the first phase and the central laminated steel plate 28 of the second phase is closed by the shell 4 throughout the circumference to form the peripheral refrigerant flow path 24, but instead, the shape of the first groove 26a itself can form a closed space to form the peripheral refrigerant flow path 24.

[0102] Reference numerals

[0103] 1 Rotating motor

[0104] 2 Rotors

[0105] 3. Stator

[0106] 4 Housing

[0107] 5 Rotation Axis

[0108] 6 Stator core

[0109] 7 Slots

[0110] 8 Conductor

[0111] 9 Stator winding

[0112] 10 Inner wall surface

[0113] 11 Insulation components

[0114] 12 Refrigerant flow path

[0115] 13 Refrigerant storage

[0116] 14 Filters

[0117] 15 Pump

[0118] 16 Heat exchanger

[0119] 17 External refrigerant flow path

[0120] 18 Refrigerant supply path

[0121] 19 Refrigerant supply port

[0122] 20 Outer end

[0123] 21 Pore

[0124] 21a First pore portion

[0125] 21b Second pore

[0126] 22 Slot side refrigerant flow path

[0127] 23 Connecting the boundary parts

[0128] 24 Outer peripheral side refrigerant flow path

[0129] 25 Connect the refrigerant flow path

[0130] 26 slots

[0131] 26a First slot

[0132] 26b Second slot

[0133] 27First phase central laminated steel plate

[0134] 28 Second phase central laminated steel plate

[0135] 29 First end side laminated steel plate

[0136] 30 Second end side laminated steel plate

[0137] 201 Thermoplastic resin

[0138] 202 Thermosetting resin

[0139] ML Magnetic Field Lines

[0140] RF Refrigerant

[0141] st stopper

Claims

1. A stator, characterized in that: include: The stator core has a plurality of slots arranged in the circumferential direction in a radially extending manner; A stator winding electrically connected to conductors respectively received in the plurality of slots and having a rectangular cross section, and arranged on the stator core; an insulating member disposed along the inner wall surface of each of the plurality of slots; and The slot-side refrigerant flow path forms a pore portion, the pore portion is connected to the radial outer end of each of the plurality of slots and allows the refrigerant to flow; and A circumferential width of a communication boundary portion where the radial innermost side of the aperture portion in the slot-side refrigerant flow path communicates with the radial outer end of the slot is narrower than a circumferential width of the slot.

2. The stator according to claim 1, wherein: The width of the hole portion in the circumferential direction is constant from the communication boundary portion toward the radial outside.

3. The stator according to claim 1, wherein: The width of the hole portion in the circumferential direction narrows from the communication boundary portion toward the radial outside.

4. The stator according to claim 1, wherein: The stator further comprises: The first groove is formed in a groove shape on the outer periphery of the stator and allows the refrigerant to flow in the circumferential direction; and, A second slot extends radially inward from the first slot in the stator; and The aforementioned pore portion includes: a first pore portion extending radially outward from the aforementioned connecting boundary portion and located radially inward of the aforementioned second groove; and The second pore portion extends radially outward from the communication boundary portion and is longer than the first pore portion.

5. The stator according to claim 4, wherein: The stator is formed of a laminated steel plate formed by laminating steel plates. The aforementioned laminated steel plates are a first laminated steel plate and a second laminated steel plate. The first laminated steel plate is formed into a shape having a portion corresponding to the first pore portion. The second laminated steel plate is formed into a shape having portions corresponding to the first groove, the second groove, the first aperture portion, and the second aperture portion, respectively.

6. A method for manufacturing a stator, which is the method for manufacturing a stator according to any one of claims 1 to 5, characterized in that: include: A thermoplastic resin curing step (S1) of filling the aforementioned pores with a thermoplastic resin and curing the same; A winding arrangement step (S2) of arranging the stator winding on the stator core in a manner of laminating a plurality of the conductors in a radial direction in the slots; a thermosetting resin curing step (S3), inserting a thermosetting resin molding material for fixing the configured stator winding into the slot and curing the thermosetting resin molding material; and, Thermoplastic resin melting step (S4) is to melt the thermoplastic resin.

Images