Stator core of rotary electric machine and rotary electric machine

Abstract

A stator core (10-1 or 10-2) of a rotary electric machine according to an embodiment is provided with: an annular core back part (10c); and a plurality of teeth parts (13) extending in the radial direction of the core back part (10c). A flow path (17) opened so that a refrigerant flows is provided inside the core back part (10c) and inside the plurality of teeth parts (13). The flow path (17) has a flow path portion through which the refrigerant flows at least inside the plurality of teeth parts (13) in the radial direction of the stator core and also in the axial direction.

Description

Rotating electric machine stator core and rotating electric machine

[0001] An embodiment of the present invention relates to a stator core for a rotating electric machine and a rotating electric machine.

[0002] Conventionally, the stator core of a rotating electrical machine, such as an electric motor or a dynamomotor, is primarily made of metal, and is made of soft magnetic material such as electromagnetic steel sheet, either as a bulk body or as a laminated structure made by stacking these sheets.

[0003] The main role and effect of the stator core is to act as a path for the generated excitation current, generating a large driving force. Because magnetic lines of force pass through iron approximately 1,000 times more easily than air, magnetic flux is efficiently transferred between the rotor and the stator armature coil, reducing leakage flux.

[0004] The stator core not only provides electrical effects but also plays an important role in structural design: it has multiple grooves (hereinafter referred to as "slots") arranged circumferentially, mainly on the inner diameter side of its structure, and these slots, into which the armature coils are placed, enhance the mechanical strength of the stator, which is the completed assembly of all components, by providing resistance to external stresses such as vibrations to which the stator is subjected.

[0005] The stator core also serves as a reference for determining the relative positions of each part, such as the gap between them, as well as for determining concentricity and axial alignment, thereby reducing the manufacturing dimensional tolerances when assembling an electric motor or dynamo-motor and promoting improved precision.

[0006] Depending on the type of electric motor, the stator may receive a large field magnetic flux from the rotor, causing eddy current loss in the metal core of the stator and resulting in heat generation. Specifically, when an electric motor or dynamo motor equipped with a certain type of rotor uses an electrical conductor such as a metal or laminated electromagnetic steel sheet for the stator core, heat is generated due to the loss. The heat generated in the armature coil of the stator has a thermal impact on the surrounding structures. Furthermore, when temperature conditions are imposed, this heat generation becomes a major issue.

[0007] On the other hand, it is conceivable that this type of motor could be made coreless, eliminating the iron core, and using an air gap in the stator teeth to virtually eliminate the flow of magnetic flux and avoid heat generation due to eddy currents in the stator teeth. However, adopting a coreless design makes assembly difficult, including determining dimensions and positioning during manufacturing, and also requires the use of assembly jigs, raising concerns about an increase in the number of steps required for processing.

[0008] One approach to solving this problem is to use a core made of a material that does not generate or can reduce eddy current loss. Because electrical conductivity is strongly correlated with eddy current loss, eddy current loss can be suppressed by using a material with low or zero electrical conductivity, such as a nonmetallic material (such as a resin). While this reduces eddy current loss, the nonmetallic materials (such as resins) generally have lower thermal conductivity than metallic materials. Therefore, unless some ingenuity is taken, heat transmitted and released through the core from the armature coil as a heat source may cause excessive temperature rise in or around the armature coil.

[0009] To solve this problem, methods of cooling the inner or outer diameter side of the stator have been considered, such as forced air cooling equipped with auxiliary equipment such as a fan, or self-cooling, which allows air to flow in and out through an outer shell structure with irregularities created by the rotation of the motor, but both of these methods involve the installation of auxiliary equipment and a burden on the structural design. Also, depending on the location and environment in which the motor is installed, miniaturization and weight reduction may be necessitated, and it is necessary to minimize the number of parts as much as possible while still maintaining the characteristics required of the motor.

[0010] For these reasons, it is desirable to provide a stator core for a rotating electric machine and a rotating electric machine that can improve cooling performance with a simple configuration.

[0011] The stator core of the rotating electric machine according to the embodiment comprises an annular core back portion and a plurality of tooth portions extending radially from the core back portion, and flow paths that are open to allow a refrigerant to flow are provided inside the core back portion and inside the plurality of tooth portions, and the flow paths have flow path portions through which the refrigerant flows radially and axially through at least the interior of the plurality of tooth portions.

[0012] FIG. 1 is a cross-sectional view showing an example of the basic configuration of a rotating electric machine according to an embodiment. FIG. 2 is a cross-sectional view showing an enlarged example of the cross-sectional shape of a portion of a stator 10 of a rotating electric machine according to an embodiment. FIG. 3 is a perspective view showing an example of the configuration of a stator core 10-1. FIG. 4 is a plan view of the stator core 10-1 as viewed from the radial direction. FIG. 5 is a conceptual diagram showing the configuration of a portion of the stator core 10-1. FIG. 6 is a conceptual diagram showing the cross-sectional shape of a portion of the stator core 10-1 near the outlet 15 shown in FIG. 5. FIG. 7 is a conceptual diagram showing the cross-sectional shape of a portion of the stator core 10-1 shown in FIG. 5, where the mounting hole 16 is located, as viewed from the circumferential direction. FIG. 8 is a conceptual diagram showing an example in which the inner wall of the flow path 17 is configured to have a fin-shaped portion. FIG. 9 is a conceptual diagram showing an example in which the flow path 17 is configured to be spaced a certain distance or more from the region of the mounting hole 16. FIG. 10 is a conceptual diagram showing the configuration of a portion of a stator core 10-2, which is different from the stator core 10-1 shown in FIG. 5. FIG. 11 is a conceptual diagram showing the cross-sectional shape of a portion of the stator core 10-2 near the inlet 14 shown in FIG. 10. FIG. 12 is a conceptual diagram showing the cross-sectional shape of the portion of the stator core 10-2 shown in FIG. 10 where the mounting hole 16 is located, as viewed from the circumferential direction. FIG. 13 is a conceptual diagram showing an example where the inner wall of the flow path 17 is configured to have an uneven portion. FIG. 14 is a conceptual diagram showing an example of the cross-sectional shape of the region sandwiched between the inlet 14 and the outlet 15. FIG. 15 is a conceptual diagram showing an example where the flow path 17 in the core back portion 10c has multiple flow path portions arranged in the circumferential direction in the region sandwiched between the inlet 14 and the outlet 15 of the stator core. Embodiment

[0013] Hereinafter, embodiments will be described with reference to the drawings.

[0014] Fig. 1 is a cross-sectional view showing an example of the basic configuration of a rotating electric machine according to an embodiment. Fig. 2 is a cross-sectional view showing an enlarged example of the cross-sectional shape of a part of a stator 10 of the rotating electric machine according to an embodiment.

[0015] In this embodiment, a refrigerant flow path is provided inside the stator core on the stator 10 side, and is open so that a refrigerant (cooling medium) can flow through it. However, Figures 1 and 2 show a state before the refrigerant flow path is provided (a state similar to that of a general rotating electrical machine). Hereinafter, the refrigerant flow path will be simply referred to as a "flow path."

[0016] Fig. 1 shows a cross-sectional shape of the rotating electric machine as viewed from the axial direction. The rotating electric machine shown in Fig. 1 corresponds to, for example, an electric motor or a dynamomotor, and includes a stator 10 and a rotor 20. The rotor 20 rotates around a rotation axis 30. The rotor 20 is disposed at a fixed distance from the stator 10, and a fixed gap is provided between the stator 10 and the rotor 20.

[0017] The stator 10 is provided with slots 11 at regular intervals in the circumferential direction, and an armature coil 12 is provided in each slot 11. An insulator (not shown) is provided between the slot 11 and the armature coil 12, and a wedge (not shown) is also provided to prevent the armature coil 12 from jumping out.

[0018] 1 shows an example in which the slots 11 and armature coils 12 are arranged closer to the inner diameter side of the stator 10, but there is also a configuration in which they are arranged closer to the outer diameter side of the stator 10. Also, while Fig. 1 shows an example in which the individual coil pieces that make up the armature coil 12 are stacked in the slots 11 in the radial direction of the rotating electric machine, there is also a configuration in which they are arranged dispersedly within the slots 11.

[0019] 2 shows an example of a cross-sectional shape of a portion of the stator 10. In this example, the individual coil pieces that make up the armature coil 12 are dispersed and arranged in the insulator 40 within the slots 11.

[0020] The stator 10 includes an annular core back portion 10c and a core body 10b disposed on the inner diameter side of the core back portion 10c. However, unlike the example in Fig. 2, there is also a configuration in which the core back portion 10c is disposed on the inner diameter side of the core body 10b (i.e., a configuration in which the positional relationship between the core body 10b and the core back portion 10c is reversed).

[0021] The core body 10b includes a plurality of teeth 13 extending radially of the core back portion 10c, and slots 11 formed between adjacent teeth 13. Individual coil pieces of the armature coil 12 are housed in the slots 11 while being insulated by insulators 40.

[0022] In this embodiment, flow paths that are open to allow the refrigerant to flow are provided inside the core back portion 10c and inside the multiple tooth portions 13, but Figures 1 and 2 show the state before the flow paths are provided.

[0023] The core back portion 10c and the plurality of teeth 13 form one stator core. The stator core is made of a non-metallic material. Hereinafter, a stator core in which the plurality of teeth 13 are arranged on the outer diameter side of the core back portion 10c will be referred to as a "stator core 10-1." On the other hand, a stator core in which the plurality of teeth 13 are arranged on the inner diameter side of the core back portion 10c will be referred to as a "stator core 10-2." Furthermore, the stator cores 10-1 and 10-2 may be collectively referred to simply as "stator cores."

[0024] Fig. 3 is a perspective view showing an example of the configuration of the stator core 10-1. Fig. 4 is a plan view of the stator core 10-1 as viewed from the radial direction. Fig. 5 is a conceptual diagram showing the configuration of a portion of the stator core 10-1.

[0025] As shown in FIGS. 3 to 5, in the stator core 10-1, a plurality of teeth 13 are arranged on the outer diameter side of the core back portion 10c.

[0026] An inlet 14 and an outlet 15 of a flow path, which will be described later, are provided on the outer diameter side of each of the plurality of teeth 13. The inlet 14 and the outlet 15 are provided at both ends of the teeth 13 on the outer diameter side surfaces 10a of the teeth 13 so as to be spaced apart in the axial direction of the stator core 10-1. In addition, mounting holes 16 are provided on the outer diameter side surfaces 10a of some of the plurality of teeth 13, into which mounting members (bolts, etc.) are inserted to be used when installing the stator core 10-1. A rotor 20 (not shown) is disposed in the inner diameter direction of the inner diameter side surface 10d of the core back portion 10c.

[0027] Fig. 6 is a conceptual diagram showing the cross-sectional shape of a portion of the stator core 10-1 in the vicinity of the outlet 15 shown in Fig. 5. Fig. 7 is a conceptual diagram showing the cross-sectional shape of the portion of the stator core 10-1 shown in Fig. 5 where the mounting hole 16 is located, as viewed from the circumferential direction.

[0028] The cross-sectional shape of the vicinity of the inlet 14 and the cross-sectional shape of the region sandwiched between the inlet 14 and the outlet 15 are similar to those shown in Fig. 6, and therefore are not shown here. However, the cross-sectional shape of the region sandwiched between the inlet 14 and the outlet 15 may be configured to be different from that shown in Fig. 6. For example, in the region sandwiched between the inlet 14 and the outlet 15, the flow path 17 in the core back portion 10c may have a plurality of flow path portions (each of which is separated by a wall) arranged circumferentially.

[0029] As can be seen from FIGS. 6 and 7, in the stator core 10-1, flow paths 17 are provided inside the core back portion 10c and inside the plurality of teeth portions 13, and are open so that the refrigerant F can flow therethrough.

[0030] In this example, as shown in Fig. 6 , the flow paths 17 inside the four tooth portions 13 are in communication with the flow paths 17 inside the core back portion 10c located on the inner diameter side of these tooth portions 13. Flow paths like the one shown in Fig. 6 are provided continuously in the circumferential direction. Note that while the example in Fig. 6 shows an example in which four tooth portions 13 are in communication, the present invention is not limited to this example, and a number of tooth portions 13 other than four may be in communication.

[0031] 6 and 7 , the flow passage 17 has a flow passage portion where the refrigerant F flows inside the multiple teeth 13 in both the radial direction and the axial direction of the stator core 10-1. The flow passage 17 also has a flow passage portion where the refrigerant F flows inside the core back portion 10c in both the axial direction and the circumferential direction of the stator core 10-1. Furthermore, the flow passage 17 has a flow passage wall surface on the back side of the inner diameter side surface 10d of the core back portion 10c, with which the refrigerant flowing inside the flow passage 17 comes into contact. This configuration of the flow passage 17 allows the refrigerant F flowing through the flow passage 17 to cool both the teeth 13 and the core back portion 10c through the wall surface of the flow passage 17.

[0032] 7, the refrigerant F enters the interior of the stator core 10-1 through the inlet 14 and flows radially inward of the stator core 10-1. The refrigerant F then flows axially through the interior of the multiple teeth 13 and the interior of the core back 10c. Therefore, the refrigerant F flows through the wall surfaces of the flow passages 17 to evenly cool both the teeth 13 and the core back 10c.

[0033] Inside the core back portion 10 c, the refrigerant F flows in both the circumferential and axial directions, and flows while coming into contact with the flow path wall surface on the back side of the inner diameter side surface 10 d of the core back portion 10 c. Therefore, the refrigerant F effectively cools the core back portion 10 c, particularly the inner diameter side portion, through the wall surface of the flow path 17.

[0034] The refrigerant F flows axially inside the teeth 13 and inside the core back 10c, then flows toward the outer diameter of the stator core 10-1 and exits the stator core 10-1 through the outlet 15.

[0035] By configuring the stator core 10-1 in this manner, it is possible to efficiently suppress and reduce the heat generated from the armature coil 12, and also to reduce heat radiation toward the inner diameter side of the stator 10, thereby suppressing the thermal impact on the gap between the stator 10 and the rotor 20 and on the surface of the rotor 20. In other words, not only can the heat generated from the armature coil 12 be efficiently suppressed and reduced, but it is also possible to suppress heat transfer to the rotor 20, suppress the heat accumulation state in the gap between the rotor 20 and the stator 10, and reduce the impact of radiant heat generated by the heat generated from the stator 10.

[0036] Various desirable features regarding the stator core 10-1 will be described below, but these features are not limited to the stator core 10-1 and are also applicable to the stator core 10-2 described below.

[0037] The flow passage 17 is required to be installed in a configuration that ensures the mechanical strength of the armature coil 12 to withstand external forces such as Lorentz force that are generated when vibrations or short-circuit currents occur during operation of the rotating electric machine 1. Therefore, dimensions such as the wall thickness and corner curvature of the flow passage 17, which are closely related to mechanical strength, are set to appropriate values ​​according to the core material and manufacturing method used in its manufacture.

[0038] The stator core is also required to have a structure that not only ensures the mechanical strength described above but also ensures effective cooling performance. To improve cooling performance, for example, it is possible to use a material with high thermal conductivity or to adopt an inner wall shape that increases the surface area.

[0039] Examples of non-metallic materials with high thermal conductivity include ceramics such as silicon carbide (SiC). However, SiC's electrical conductivity increases significantly at high temperatures, which leads to increased eddy current loss. When using a material with a high temperature dependency of electrical conductivity such as SiC, it is necessary to confirm that the cooling performance and efficiency, as well as the temperature rise of the stator core, meet the standards.

[0040] A suitable example of a non-metallic material is a resin material, which is preferably a highly heat-resistant resin material, and is preferably made of PPS (polyphenylene sulfide resin) or PEEK (polyether ether ketone resin) so that the temperature that may rise momentarily in an emergency or the like falls within the specified temperature range.

[0041] It is also desirable that the stator core be capable of being machined to make holes, notches, etc. that are required during manufacturing. To achieve this, it is desirable to conduct strength tests in accordance with standards to check whether the machined parts can withstand the loads and stresses that will be applied during and after machining, and to determine the shape and dimensions that can accommodate these.

[0042] Regarding the cooling performance of the stator core, it is desirable to confirm the flow rate and temperature changes for various shapes of the stator core in advance using thermal fluid analysis and extract the optimal shape.

[0043] In thermal fluid analysis, the cross-sectional shape, as well as the temperature and flow distribution in a three-dimensional projection extended in the axial direction, are checked using the teeth shape, type of refrigerant, flow rate, and temperature as parameters. In both cases, it is desirable to transiently check the temperature effect on the stator core and the temperature change of the refrigerant itself, and set the optimal shape, inlet / outlet installation locations, and inlet / outlet volume for excellent cooling performance.

[0044] The temperature distribution is largely dependent on the thermal conductivity and workability of the stator core material. Therefore, when using test specimens for analysis, it is desirable to make the test specimen preparation conditions (material processing, machining, and shape) as similar as possible to those of the finished product.

[0045] Regarding the mechanical strength of the stator core, it is desirable to first check the torque force and strength resistance that will occur during operation through stress analysis, and then to carry out bending tests and vibration tests, for example, to check the effects of loads during processing.

[0046] Furthermore, because the refrigerant that passes through the inside of the stator core has a strong correlation with temperature, when selecting a refrigerant it is advisable to select one that takes into account specifications such as operation and maintenance intervals, as well as the installation and usage environments, and to understand the characteristics and trends of the refrigerant within the flow path.Depending on the installation environment, it is also advisable to conduct a preliminary analysis of a model that simulates the aging state of the refrigerant and check for changes in electrical characteristics.

[0047] In order to efficiently increase the surface area, the inner wall of the flow path 17 preferably has fin-shaped or uneven portions. These portions are preferably arranged and shaped so as not to impede the flow of the refrigerant.

[0048] 8 is a conceptual diagram showing an example in which the inner wall of the flow path 17 is configured to have fin-shaped portions. By forming the inner wall of the flow path 17 in a fin-shaped configuration in this way, the surface area can be increased by approximately 1.5 to 2.0 times compared to a case without fins, thereby improving cooling efficiency. The same can be said for a case in which an uneven shape is applied.

[0049] In addition, in the region sandwiched between the inlet 14 and the outlet 15 of the stator core, the flow path 17 in the core back portion 10c may be configured to have a plurality of flow path portions arranged in the circumferential direction.

[0050] 8 shows an example in which the flow passage 17 in the core back portion 10c is configured to have a plurality of flow passage portions (each of which is separated by a wall) arranged circumferentially in the region sandwiched between the inlet 14 and the outlet 15 of the stator core. With this configuration, the core back portion 10c can be cooled evenly, and the cooling efficiency in the core back portion 10c can be improved.

[0051] In addition, in the vicinity of the mounting hole 16 of the stator core, the flow path 17 is preferably configured to have a flow path portion that is adjusted to be separated from the region of the mounting hole 16 by a certain distance or more.

[0052] 9 is a conceptual diagram showing an example in which the flow path 17 is configured to be at least a certain distance away from the region of the mounting hole 16. By configuring it in this way, it is possible to increase the degree of freedom in designing the mounting hole 16 while maintaining a certain level of cooling performance.

[0053] FIG. 10 is a conceptual diagram showing the configuration of a portion of a stator core 10-2 that is different from the stator core 10-1 shown in FIG.

[0054] The stator core 10-2 shown in Figure 10 is the stator core shown in Figure 2 (excluding the armature coil 12 and the insulator 40) to which a flow path 17, an inlet 14, an outlet 15, etc. have been added.

[0055] As shown in FIG. 10, in the stator core 10-2, a plurality of teeth 13 are arranged on the inner diameter side of the core back portion 10c.

[0056] An inlet 14 and an outlet 15 of a flow path, which will be described later, are provided on the outer diameter side of the core back portion 10c. The inlet 14 and the outlet 15 are provided at both ends of the core back portion 10c on the outer diameter side surface 10a of the core back portion 10c so as to be spaced apart in the axial direction of the stator core 10-2. Furthermore, mounting holes 16 are provided in the outer diameter side surface 10a of the core back portion 10c, into which mounting members (bolts, etc.) used when installing the stator core 10-1 are inserted. A rotor 20 (not shown) is disposed in the inner diameter direction of the inner diameter side surface 10d of the core back portion 10c.

[0057] Fig. 11 is a conceptual diagram showing the cross-sectional shape of a portion of the stator core 10-2 in the vicinity of the inlet 14 shown in Fig. 10. Fig. 12 is a conceptual diagram showing the cross-sectional shape of the portion of the stator core 10-2 shown in Fig. 10 where the mounting hole 16 is located, as viewed from the circumferential direction.

[0058] The cross-sectional shape in the vicinity of the outlet 15 and the cross-sectional shape of the region sandwiched between the inlet 14 and the outlet 15 are similar to those shown in Fig. 11 and are therefore not shown here. However, the cross-sectional shape of the region sandwiched between the inlet 14 and the outlet 15 may be configured to be different from that shown in Fig. 11. For example, in the region sandwiched between the inlet 14 and the outlet 15, the flow path 17 in the core back portion 10c may have a plurality of flow path portions (each of which is separated by a wall) arranged circumferentially.

[0059] As can be seen from FIGS. 11 and 12, in the stator core 10-2, flow paths 17 are provided inside the core back portion 10c and inside the plurality of teeth portions 13, and are open so that the refrigerant F can flow therethrough.

[0060] 11 and 12, the flow path 17 has a flow path portion where the refrigerant F flows inside the multiple teeth 13 in the radial direction of the stator core 10-2 and also in the axial direction. The flow path 17 has a flow path wall surface on the back side of the outer diameter side surface 10a of the core back portion 10c, with which the refrigerant F flowing inside the flow path 17 comes into contact. With this configuration of the flow path 17, the refrigerant F flowing through the flow path 17 cools both the teeth 13 and the core back portion 10c through the wall surface of the flow path 17.

[0061] 12, the refrigerant F enters the interior of the stator core 10-2 through the inlet 14 and flows radially inward of the stator core 10-2. The refrigerant F then flows axially through the interior of the multiple teeth 13. Therefore, the refrigerant F flows through the wall surfaces of the flow passages 17 to evenly cool the teeth 13 and the core back 10c.

[0062] The refrigerant F flows axially inside the teeth 13, then flows radially outward from the stator core 10-2, and exits the stator core 10-2 through the outlet 15.

[0063] By configuring the stator core 10-2 in this manner, the heat generated by the armature coil 12 can be efficiently suppressed and reduced, and heat dissipation to the outer diameter side of the core back portion 10c can also be reduced, thereby reducing and suppressing the thermal impact on surrounding structures.

[0064] In this example, too, the inner wall of the flow path 17 preferably has fin-shaped or uneven portions to efficiently increase the surface area. These portions are preferably arranged and shaped so as not to impede the flow of the refrigerant F.

[0065] 13 is a conceptual diagram showing an example in which the inner wall of the flow path 17 is configured to have an uneven portion. By forming the inner wall of the flow path 17 in this uneven shape, the surface area can be increased by approximately 1.5 to 2.0 times compared to when the inner wall is not uneven, thereby improving the cooling efficiency. The same can be said when a fin shape is applied.

[0066] Fig. 13 shows the cross-sectional shape of a portion of the stator core 10-2 near the outlet 15. The cross-sectional shape near the inlet 14 and the cross-sectional shape of the region sandwiched between the inlet 14 and the outlet 15 are similar to those shown in Fig. 13, and therefore are not shown here. However, the cross-sectional shape of the region sandwiched between the inlet 14 and the outlet 15 may be configured to be different from that shown in Fig. 13.

[0067] FIG. 14 is a conceptual diagram showing an example of the cross-sectional shape of the region sandwiched between the inlet 14 and the outlet 15. In FIG.

[0068] In the example of FIG. 14, the flow passages 17 inside the four tooth portions 13 communicate with the flow passages 17 inside the core back portion 10c located on the outer diameter side of these tooth portions.

[0069] That is, the flow passage 17 has a flow passage portion through which the refrigerant F flows inside the core back portion 10c in both the axial direction and the circumferential direction of the stator core 10-1. Furthermore, the flow passage 17 has a flow passage wall surface on the back side of the outer diameter side surface 10a of the core back portion 10c, with which the refrigerant F flowing inside the flow passage 17 comes into contact.

[0070] In this way, by forming a flow path portion through which the refrigerant F flows inside the core back portion 10c, not only can the heat generated from the armature coil 12 be removed, but the thermal impact on surrounding structures can also be efficiently reduced and suppressed.

[0071] In the region sandwiched between the inlet 14 and the outlet 15 of the stator core, the flow path 17 in the core back portion 10c may be configured to have a plurality of flow path portions arranged in the circumferential direction.

[0072] 15 shows an example in which the flow passage 17 in the core back portion 10c has a plurality of flow passage portions (each of which is separated by a wall) arranged circumferentially in the region between the inlet 14 and the outlet 15 of the stator core. With this configuration, the core back portion 10c can be cooled evenly, and the cooling efficiency in the core back portion 10c can be improved.

[0073] 15 shows an example in which the inner wall of the flow path 17 is configured to have a fin-shaped portion. In this way, when the inner wall of the flow path 17 is configured in a fin-like shape, the surface area of ​​the flow path 17 can be increased, and the cooling efficiency can be improved, just like when the inner wall is configured in an uneven shape.

[0074] As described above in detail, according to the embodiments, it is possible to provide a stator core for a rotating electric machine and a rotating electric machine that can improve cooling performance with a simple configuration.

[0075] For example, according to the embodiment, while maintaining the manufacturing dimensional accuracy of the stator core or the rotating electric machine, it is possible to reduce eddy current loss generated in the stator core, and in addition to cooling the armature coil, it is also possible to efficiently cool the rotor installed on the inner diameter side of the stator core or the structure installed on the outer diameter side.

[0076] Furthermore, according to the embodiment, it is possible to reduce the number of parts as much as possible and achieve size and weight reduction within the range that ensures the characteristics required of a rotating electric machine.

[0077] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims.

Claims

1. A stator core of a rotating electrical machine, comprising an annular core back portion and a plurality of teeth portions extending in the radial direction of the core back portion, wherein a flow path is provided inside the core back portion and inside the plurality of teeth portions so that a refrigerant flows therethrough, and the flow path has a flow path portion in which the refrigerant flows at least inside the plurality of teeth portions in the radial direction of the stator core and also in the axial direction. A stator core of a rotating electrical machine.

2. The stator core of a rotating electrical machine according to claim 1, wherein the plurality of teeth portions are arranged on the outer diameter side of the core back portion, and an inlet and an outlet of the flow path are provided on the outer diameter side of each of the plurality of teeth portions, spaced apart in the axial direction. A stator core of a rotating electrical machine.

3. The stator core of a rotating electrical machine according to claim 2, wherein the flow path has a flow path wall surface with which the refrigerant flowing through the flow path comes into contact on the back side of the inner diameter side surface of the core back portion. A stator core of a rotating electrical machine.

4. The stator core of a rotating electrical machine according to claim 2, wherein the flow path has a flow path portion in which the refrigerant flows in the circumferential direction inside the core back portion. A stator core of a rotating electrical machine.

5. The stator core of a rotating electrical machine according to claim 2, wherein the flow path has a flow path portion in which the refrigerant flows in the axial direction and also in the circumferential direction inside the core back portion. A stator core of a rotating electrical machine.

6. The stator core of a rotating electrical machine according to claim 2, wherein the flow path has a flow path portion in which the refrigerant flows in the axial direction inside the core back portion, and the flow path portions are arranged in a plurality in the circumferential direction. A stator core of a rotating electrical machine.

7. The stator core of a rotating electrical machine according to claim 2, wherein the inner wall of the flow path has a fin-shaped portion or a concavo-convex portion. A stator core of a rotating electrical machine.

8. The stator core of a rotating electrical machine according to claim 2, wherein a mounting hole for inserting a mounting member is provided on the outer diameter side of the stator core, and the flow path has a flow path portion adjusted to be at a certain distance or more away from the region of the mounting hole. A stator core of a rotating electrical machine.

9. In the stator core of the rotating electrical machine according to claim 1, the plurality of teeth are arranged on the inner diameter side of the core back portion, and on the outer diameter side of the core back portion, an inlet and an outlet of the flow path are provided at an axial interval, a stator core of a rotating electrical machine.

10. In the stator core of the rotating electrical machine according to claim 9, the flow path has a flow path wall surface with which a refrigerant flowing in the flow path comes into contact on the back side of the outer diameter side surface of the core back portion, a stator core of a rotating electrical machine.

11. In the stator core of the rotating electrical machine according to claim 9, the flow path has a flow path portion in which the refrigerant flows in the circumferential direction inside the core back portion, a stator core of a rotating electrical machine.

12. In the stator core of the rotating electrical machine according to claim 9, the flow path has a flow path portion in which the refrigerant flows in the axial direction and also in the circumferential direction inside the core back portion, a stator core of a rotating electrical machine.

13. In the stator core of the rotating electrical machine according to claim 9, the flow path has a plurality of flow path portions in which the refrigerant flows in the axial direction inside the core back portion, and the plurality of flow path portions are arranged side by side in the circumferential direction, a stator core of a rotating electrical machine.

14. In the stator core of the rotating electrical machine according to claim 9, the inner wall of the flow path has a fin-shaped portion or a concavo-convex shaped portion, a stator core of a rotating electrical machine.

15. A rotating electrical machine comprising: a stator in which a stator coil is provided on the stator core according to any one of claims 1 to 14; a rotor arranged at a certain distance from the stator.

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