Stator core of rotary electric machine and rotary electric machine

Abstract

To improve cooling performance with a simple configuration.SOLUTION: A stator core of a rotary electric machine according to an embodiment includes: an annular core back part; and a plurality of tooth parts extending in a radial direction of the core back part. On the insides of the core back part the plurality of tooth parts, a flow channel which is open so as to circulate a coolant therein is provided. The flow channel includes a flow channel portion where the coolant flows in a radial direction of the stator core and also in the axis direction inside at least the plurality of tooth parts.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] Embodiments of the present invention relate to a stator core of a rotating electrical machine and a rotating electrical machine.

Background Art

[0002] Conventionally, for a stator core of a rotating electrical machine, for example, a stator core of a motor or a generator, metal is mainly used as its material. The stator core is made of a soft magnetic material such as an electromagnetic steel sheet, and has a bulk body made of them or a laminated structure in which they are laminated.

[0003] The main role and effect of the stator core is to serve as a path for the generated exciting current and provide a large driving force. Since iron allows magnetic flux lines to pass through about 1000 times more easily than air, magnetic flux is efficiently transferred between the rotor and the armature coils of the stator, and leakage magnetic flux is reduced.

[0004] The stator core not only provides an electrical effect but also plays an important role in structural design. That is, the stator core has a plurality of grooves (hereinafter referred to as "slots") arranged in the circumferential direction mainly on the inner diameter side of the structure, and by accommodating the armature coils in these slots, the stator, which is a complete assembled body of all components, realizes resistance to external stresses such as vibration and plays a role in improving mechanical strength.

[0005] In addition, the stator core serves as a reference for the relative positional relationship such as the gap between each part, concentricity, and shaft extension, etc., reduces the manufacturing dimension tolerance when assembling the motor or generator, and helps to improve the accuracy.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Depending on the type of the electric motor, the magnetic flux in the stator received from the rotor may be large. In such a case, eddy current loss occurs in the metal core of the stator, resulting in heat generation. Specifically, when an electric conductor such as a metal or a laminated electromagnetic steel sheet is used for the stator core of a motor or a generator having a certain type of rotor, heat due to loss is generated. The heat generation in the armature coil of the stator affects the surrounding structures thermally. Also, when temperature conditions are imposed, this heat generation becomes a major issue.

[0008] On the other hand, in this type of electric motor, it is conceivable to adopt a coreless form without a core, and by making the stator tooth portion an air layer, the flow of magnetic flux is almost eliminated, and heat generation due to the generation of eddy currents in the stator tooth portion is avoided. However, when coreless is adopted, the assemblability such as dimensions and positioning during manufacturing becomes difficult, and the need for assembly jigs is imposed, raising concerns about an increase in man-hours for processing.

[0009] As one of the methods for solving the above problems, it is conceivable to adopt a core made of a material that does not generate or can reduce eddy current loss. Since the electrical conductivity has a strong correlation with the eddy current loss, the eddy current loss can be suppressed by using a material having a low or zero electrical conductivity, for example, a non-metallic material (such as a resin material). This makes it possible to suppress the eddy current loss. However, since the above-mentioned non-metallic materials (such as resin materials) generally have a lower thermal conductivity than metal materials, without some contrivance, the heat transmitted and released through the core with the armature coil as a heat source may cause an excessive temperature rise inside or around the armature coil.

[0010] In order to solve this problem, as a method of cooling the inner diameter side or the outer diameter side of the stator, it is conceivable to adopt forms such as a forced air cooling type equipped with auxiliary devices such as a fan, or a self air cooling type in which the flow of air accompanying the rotation of the motor is allowed to enter and exit through an outer shell structure provided with unevenness. However, all of them involve a load on the installation of auxiliary devices and the structural design. In addition, depending on the place and environment where the motor is installed, miniaturization and weight reduction are strongly required as conditions, and within the range of ensuring the characteristics required for the motor, it is required to minimize the number of parts as much as possible.

[0011] The present invention has been made in view of the above circumstances, and an object thereof is to provide a stator core of a rotating electrical machine and a rotating electrical machine that can improve cooling performance with a simple configuration.

Means for Solving the Problems

[0012] The stator core of the rotating electrical machine according to the embodiment includes an annular core back portion and a plurality of teeth portions extending in the radial direction of the core back portion, and a flow path is provided inside the core back portion and inside the plurality of teeth portions so that a refrigerant can flow. 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.

Effects of the Invention

[0013] According to the present invention, it is possible to provide a stator core of a rotating electrical machine and a rotating electrical machine that can improve cooling performance with a simple configuration.

Brief Description of the Drawings

[0014]

Figure 1

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Figure 15

[0015] Hereinafter, embodiments will be described with reference to the drawings.

[0016] FIG. 1 is a cross-sectional view showing an example of the basic configuration of a rotating electrical machine according to an embodiment. FIG. 2 is a cross-sectional view showing an enlarged example of a partial cross-sectional shape of the stator 10 of the rotating electrical machine according to the embodiment.

[0017] In this embodiment, a refrigerant flow path is provided inside the stator core on the stator 10 side and is opened so that a refrigerant (cooling medium) flows through it. However, FIGS. 1 and 2 show the state before the refrigerant flow path is provided (the same state as a general rotating electrical machine). Hereinafter, the refrigerant flow path will be simply referred to as the "flow path".

[0018] FIG. 1 shows a cross-sectional shape of the rotating electrical machine when viewed from the axial direction. The rotating electrical machine shown in FIG. 1 corresponds to, for example, an electric motor or a generator, and includes a stator 10 and a rotor 20. The rotor 20 rotates about a rotating shaft 30. The rotor 20 is arranged at a certain distance from the stator 10, and a certain gap is provided between the stator 10 and the rotor 20.

[0019] Slots 11 are provided in the stator 10 at regular intervals in the circumferential direction, and armature coils 12 are provided in the individual slots 11. An insulator (not shown) is provided between the slot 11 and the armature coil 12, and a wedge (not shown) for preventing the armature coil 12 from protruding is also provided.

[0020] FIG. 1 shows an example of a form in which the slots 11 and the armature coils 12 are arranged closer to the inner diameter side of the stator 10, but there is also a form in which they are arranged closer to the outer diameter side of the stator 10. Further, FIG. 1 shows an example of a form in which the individual coil pieces constituting the armature coil 12 are laminated in the radial direction of the rotating electrical machine within the slot 11, but there is also a form in which they are arranged dispersedly within the slot 11.

[0021] FIG. 2 shows an example of the cross-sectional shape of a part of the stator 10. Here, an example of a form in which the individual coil pieces constituting the armature coil 12 are dispersed and arranged in the insulator 40 in the slot 11 is shown.

[0022] 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, different from the example of FIG. 2, there is also a form in which the core back portion 10c is disposed on the inner diameter side of the core body 10b (that is, a form in which the arrangement relationship between the core body 10b and the core back portion 10c is reversed).

[0023] The core body 10b includes a plurality of teeth portions 13 extending in the radial direction of the core back portion 10c and slots 11 formed between adjacent teeth portions 13. In the slots 11, the individual coil pieces of the armature coil 12 are housed in a state insulated by the insulator 40.

[0024] In this embodiment, flow paths are provided inside the core back portion 10c and inside the plurality of teeth portions 13 so that the refrigerant can flow. However, FIGS. 1 and 2 show the state before the flow paths are provided.

[0025] The core back portion 10c and the plurality of teeth portions 13 constitute one stator core. The stator core is made of a non-metallic material. Hereinafter, a stator core in which the plurality of teeth portions 13 are disposed on the outer diameter side of the core back portion 10c is referred to as "stator core 10-1". On the other hand, a stator core in which the plurality of teeth portions 13 are disposed on the inner diameter side of the core back portion 10c is referred to as "stator core 10-2". Also, the stator core 10-1 and the stator core 10-2 may be collectively referred to simply as "stator core".

[0026] FIG. 3 is a perspective view showing an example of the configuration of the stator core 10-1. FIG. 4 is a plan view when the stator core 10-1 is viewed from the radial direction. FIG. 5 is a conceptual diagram showing a part of the configuration of the stator core 10-1.

[0027] As shown in FIGS. 3 to 5, in the stator core 10-1, a plurality of teeth portions 13 are arranged on the outer diameter side of the core back portion 10c.

[0028] On the outer diameter side of each of the plurality of teeth portions 13, an inlet 14 and an outlet 15 of a later-described flow path are provided. The inlet 14 and the outlet 15 are provided at both ends of the teeth portion 13 so as to be separated in the axial direction of the stator core 10-1 on the outer diameter side surface 10a of the teeth portion 13. Further, mounting holes 16 for inserting mounting members (such as bolts) used when installing the stator core 10-1 are provided on the outer diameter side surfaces 10a of some of the plurality of teeth portions 13. A rotor 20 (not shown) is arranged in the inner diameter direction of the inner diameter side surface 10d of the core back portion 10c.

[0029] FIG. 6 is a conceptual diagram showing a partial cross-sectional shape of the stator core 10-1 in the vicinity of the outlet 15 shown in FIG. 5. FIG. 7 is a conceptual diagram when the cross-sectional shape of the portion of the stator core 10-1 having the mounting hole 16 shown in FIG. 5 is viewed from the circumferential direction.

[0030] Note that since the cross-sectional shape in the vicinity of the inlet 14 and the cross-sectional shape of the region sandwiched between the inlet 14 and the outlet 15 are the same as those shown in FIG. 6, the illustration thereof is omitted 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 (a plurality of flow path portions each partitioned by a wall) arranged side by side in the circumferential direction.

[0031] As can be seen from FIGS. 6 and 7, in the stator core 10-1, a flow path 17 is provided which is opened so that the refrigerant F flows inside the core back portion 10c and inside the plurality of teeth portions 13.

[0032] In this example, as shown in FIG. 6, the flow paths 17 inside the four tooth portions 13 communicate with the flow paths 17 inside the core back portion 10c located on the inner diameter side thereof. The form as shown in FIG. 6 is provided continuously in the circumferential direction. In the example of FIG. 6, an example where the four tooth portions 13 communicate is shown, but the present invention is not limited to this example, and a form in which a number of tooth portions 13 different from four communicate may also be used.

[0033] As shown in FIGS. 6 and 7, the flow path 17 has a flow path portion through which the refrigerant F flows inside the plurality of tooth portions 13 in the radial direction of the stator core 10-1 and also in the axial direction. Further, the flow path 17 has a flow path portion through which the refrigerant F flows inside the core back portion 10c in the axial direction of the stator core 10-1 and also in the circumferential direction. Furthermore, the flow path 17 has a flow path wall surface with which the refrigerant flowing in the flow path 17 comes into contact on the back side of the inner diameter side surface 10d of the core back portion 10c. With such a configuration of the flow path 17, the refrigerant F flowing through the flow path 17 cools both the tooth portion 13 and the core back portion 10c through the wall surface of the flow path 17.

[0034] Specifically, as shown in FIG. 7, the refrigerant F enters the inside of the stator core 10-1 from the inlet 14 and flows in the inner diameter direction of the stator core 10-1. Thereafter, the refrigerant F flows in the axial direction inside the plurality of tooth portions 13 and the core back portion 10c. Therefore, the refrigerant F cools both the tooth portion 13 and the core back portion 10c evenly through the wall surface of the flow path 17.

[0035] Inside the core back portion 10c, the refrigerant F flows in the axial direction while flowing in the circumferential direction, and flows while also coming into contact with the flow path wall surface on the back side of the inner diameter side surface 10d of the core back portion 10c. Therefore, the refrigerant F effectively cools particularly the inner diameter side portion of the core back portion 10c through the wall surface of the flow path 17.

[0036] The refrigerant F flows axially inside the plurality of tooth portions 13 and inside the core back portion 10c, then flows radially outward of the stator core 10-1, and exits from the outlet 15 to the outside of the stator core 10-1.

[0037] By configuring the stator core 10-1 in this way, it is possible to efficiently suppress and reduce the heat generated from the armature coil 12, reduce the heat dissipation to the inner diameter side of the stator 10, and suppress the heat influence on the gap between the stator 10 and the rotor 20 and on the surface of the rotor 20. That is, not only can the heat generated from the armature coil 12 be efficiently suppressed and reduced, but also the heat transfer to the rotor 20 can be suppressed, the heat storage state stagnating in the gap between the rotor 20 and the stator 10 can be suppressed, and the influence of radiant heat due to the heat generated from the stator 10 can be reduced.

[0038] Hereinafter, various desirable matters regarding the stator core 10-1 will be described, but these matters are not limited to the stator core 10-1 and are also applicable to the stator core 10-2 described later.

[0039] The flow path 17 needs to be installed in a configuration that ensures the mechanical strength that the armature coil 12 can withstand against external forces such as vibrations during the operation of the rotating electrical machine 1 and Lorentz forces generated when a short-circuit current occurs. Therefore, dimensions such as the wall thickness of the flow path 17 and the curvature of the corners, which are greatly related to the mechanical strength, shall be set to appropriate values according to the core material used for manufacturing and the manufacturing method.

[0040] In addition, the stator core is required to have a structure that exhibits its effect not only in ensuring the above-described mechanical strength but also in terms of cooling performance. To improve the cooling performance, for example, using a material with high thermal conductivity or applying an inner wall shape with a larger surface area can be mentioned.

[0041] Examples of non-metallic materials with high thermal conductivity include ceramics such as silicon carbide (SiC). However, since SiC has a significantly increased electrical conductivity in the high-temperature range, it is accompanied by an increase in eddy current loss. When using a material with a large temperature dependence of electrical conductivity such as SiC, it shall be confirmed that the cooling performance and efficiency, and the temperature rise of the stator core meet the standards.

[0042] A preferred example of the non-metallic material is a resin material. The resin material is preferably a high heat-resistant resin material. In order to ensure that the temperature that instantaneously rises during an emergency or the like is included in the specification temperature range, it is desirable to use PPS (polyphenylene sulfide resin) or PEEK (polyether ether ketone resin).

[0043] Also, it is desirable that the stator core can be processed with holes, notches, etc. required during manufacturing. For this purpose, it is desirable to conduct a strength test in accordance with the standards regarding the presence or absence of resistance to the load and weight applied to the processed part during and after processing, and set the corresponding form and dimensions.

[0044] Regarding the cooling performance of the stator core, it is desirable to confirm the changes in flow rate and temperature for various shapes of the stator core in advance by thermal fluid analysis and extract the optimal shape.

[0045] In thermal fluid analysis, using the tooth shape, refrigerant type, flow rate, and temperature as parameters, confirm the cross-sectional shape and the temperature distribution and flow rate distribution in the three-dimensional elevation extended in the axial length direction. It is desirable to transiently confirm the temperature influence on the stator core and the temperature change of the refrigerant itself, and set the optimal shape, inlet and outlet installation locations, and inlet and outlet quantities with excellent cooling performance.

[0046] Note that the temperature distribution greatly depends on the thermal conductivity and workability of the material of the stator core. Therefore, when using test pieces in the analysis, it is desirable to make the production conditions (treatment, processing, and shape of the material) of the test pieces as equivalent to the completed product as possible.

[0047] Regarding the mechanical strength of the stator core, it is desirable to perform stress analysis to confirm the torque force and strength resistance that occur during operation in advance, and then conduct, for example, bending tests and vibration tests to confirm the influence of the load during processing.

[0048] In addition, since the refrigerant passed through the stator core has a strong correlation with temperature, when selecting the refrigerant, it is desirable to select a refrigerant according to specifications such as operation and maintenance periods, installation environment, and usage environment, and to grasp the characteristics and trends of the refrigerant in the flow path. Also, depending on the installation environment, it is desirable to perform pre-analysis on a model simulating the aging degradation state of the refrigerant and to confirm the changes in electrical characteristics.

[0049] The inner wall of the flow path 17 preferably has a fin-shaped part or an uneven-shaped part in order to efficiently increase the surface area. Note that these parts should have an arrangement and shape such that the flow of the refrigerant is not blocked.

[0050] FIG. 8 is a conceptual diagram showing an example of a case where the inner wall of the flow path 17 is configured to have a fin-shaped part. By making the inner wall of the flow path 17 fin-shaped in this way, it is possible to increase the surface area by about 1.5 to 2.0 times compared to the case without a fin shape, and the cooling efficiency can be improved. The same can be said for the case where an uneven shape is applied.

[0051] Also, 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 side by side in the circumferential direction.

[0052] FIG. 8 shows an example of a case where, 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 is configured to have a plurality of flow path portions (a plurality of flow path portions each separated by a wall) arranged side by side in the circumferential direction. By configuring in this way, the core back portion 10c can be cooled evenly, and the cooling efficiency in the core back portion 10c can be improved.

[0053] Also, in the vicinity of the mounting hole 16 of the stator core, it is desirable that the flow path 17 is configured to have a flow path portion adjusted to be separated from the region of the mounting hole 16 by a certain distance or more.

[0054] FIG. 9 is a conceptual diagram showing an example in the case where the flow path 17 is configured to be separated from the region of the mounting hole 16 by a certain distance or more. By configuring in this way, it is possible to increase the design freedom of the mounting hole 16 while maintaining a certain level of cooling performance.

[0055] FIG. 10 is a conceptual diagram showing a partial configuration of a stator core 10-2 different from the stator core 10-1 shown in FIG. 5.

[0056] The stator core 10-2 shown in FIG. 10 is obtained by adding a flow path 17, an inlet 14, an outlet 15, etc. to the stator core (the part excluding the armature coil 12 and the insulator 40) shown in FIG. 2.

[0057] As shown in FIG. 10, in the stator core 10-2, a plurality of teeth portions 13 are arranged on the inner diameter side of the core back portion 10c.

[0058] On the outer diameter side of the core back portion 10c, an inlet 14 and an outlet 15 of a flow path described later are provided. The inlet 14 and the outlet 15 are provided at both ends of the core back portion 10c so as to be separated in the axial direction of the stator core 10-2 on the outer diameter side surface 10a of the core back portion 10c. Further, on the outer diameter side surface 10a of the core back portion 10c, a mounting hole 16 for inserting a mounting member (such as a bolt) used when installing the stator core 10-1 is provided. A rotor 20 (not shown) is arranged in the inner diameter direction of the inner diameter side surface 10d of the core back portion 10c.

[0059] FIG. 11 is a conceptual diagram showing a partial cross-sectional shape of the stator core 10-2 in the vicinity of the inlet 14 shown in FIG. 10. FIG. 12 is a conceptual diagram when the cross-sectional shape of the portion with the mounting hole 16 of the stator core 10-2 shown in FIG. 10 is viewed from the circumferential direction.

[0060] Note that since the cross-sectional shape near the outlet 15 and the cross-sectional shape of the region sandwiched between the inlet 14 and the outlet 15 are the same as those shown in FIG. 11, the illustration thereof is omitted 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 arranged side by side in the circumferential direction (a plurality of flow path portions each partitioned by a wall).

[0061] As can be seen from FIGS. 11 and 12, in the stator core 10-2, flow paths 17 are provided that are opened so that the refrigerant F flows inside the core back portion 10c and inside the plurality of teeth portions 13.

[0062] As shown in FIGS. 11 and 12, the flow path 17 has a flow path portion in which the refrigerant F flows inside the plurality of teeth portions 13 toward the radial direction of the stator core 10-2 and also toward 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 in the flow path 17 comes into contact. With such a configuration of the flow path 17, the refrigerant F flowing through the flow path 17 cools both the teeth portion 13 and the core back portion 10c through the wall surface of the flow path 17.

[0063] Specifically, as shown in FIG. 12, the refrigerant F enters the inside of the stator core 10-2 from the inlet 14 and flows toward the inner diameter direction of the stator core 10-2. Thereafter, the refrigerant F flows through the inside of the plurality of teeth portions 13 toward the axial direction. Therefore, the refrigerant F cools the teeth portion 13 and the core back portion 10c evenly through the wall surface of the flow path 17.

[0064] After the refrigerant F flows through the inside of the plurality of teeth portions 13 toward the axial direction, it flows toward the outer diameter direction of the stator core 10-2 and exits from the outlet 15 to the outside of the stator core 10-2.

[0065] By configuring the stator core 10-2 in this way, it is possible to efficiently suppress and reduce the heat generated from the armature coil 12, reduce the heat dissipation to the outer diameter side of the core back portion 10c, and reduce and suppress the thermal influence on the surrounding structures.

[0066] Also in this example, it is desirable that the inner wall of the flow path 17 has a fin-shaped portion or an uneven-shaped portion in order to efficiently increase the surface area. Note that these portions should be arranged and shaped so that the flow of the refrigerant F does not stagnate.

[0067] FIG. 13 is a conceptual diagram showing an example of a case where the inner wall of the flow path 17 is configured to have an uneven-shaped portion. By making the inner wall of the flow path 17 uneven in this way, it is possible to increase the surface area by approximately 1.5 to 2.0 times compared to the case without the uneven shape, and improve the cooling efficiency. The same can be said when applying a fin shape.

[0068] FIG. 13 shows a partial cross-sectional shape of the stator core 10-2 in the vicinity of the outlet 15. Note that since the cross-sectional shape in the vicinity of the inlet 14 and the cross-sectional shape of the region sandwiched between the inlet 14 and the outlet 15 are the same as those shown in FIG. 13, the illustration thereof is omitted 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.

[0069] 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.

[0070] In the example of FIG. 14, the flow paths 17 inside the four teeth portions 13 communicate with the flow paths 17 inside the core back portion 10c located on the outer diameter side thereof.

[0071] That is, the flow path 17 has a flow path portion where the refrigerant F flows inside the core back portion 10c in the axial direction of the stator core 10-1 and also in the circumferential direction. Further, 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 in the flow path 17 comes into contact.

[0072] By forming such a flow path portion where the refrigerant F also flows inside the core back portion 10c in this way, in addition to removing the heat generated from the armature coil 12, the thermal influence on the surrounding structures can be efficiently reduced and suppressed.

[0073] Note that 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 side by side in the circumferential direction.

[0074] FIG. 15 shows an example in the region sandwiched between the inlet 14 and the outlet 15 of the stator core, where the flow path 17 in the core back portion 10c has a plurality of flow path portions (each a plurality of flow path portions partitioned by walls) arranged side by side in the circumferential direction. By configuring in this way, the core back portion 10c can be cooled evenly, and the cooling efficiency in the core back portion 10c can be enhanced.

[0075] Also, FIG. 15 shows an example when the inner wall of the flow path 17 is configured to have a fin-shaped portion. Even when the inner wall of the flow path 17 is made fin-shaped in this way, similar to the case of making it an uneven shape, the surface area of the flow path 17 can be increased, and the cooling efficiency can be enhanced.

[0076] As described in detail above, according to the embodiment, it is possible to provide a stator core of a rotating electrical machine and a rotating electrical machine that can improve the cooling performance with a simple configuration.

[0077] For example, according to an embodiment, while maintaining the manufacturing dimensional accuracy of the stator core or the rotating electrical machine, the eddy current loss generated in the stator core is reduced, and in addition to cooling the armature coil, cooling of the rotor installed on the inner diameter side of the stator core or cooling of the structure installed on the outer diameter side can be efficiently performed.

[0078] Also, according to an embodiment, within the range of ensuring the characteristics required for the rotating electrical machine, the number of components can be suppressed as much as possible, and miniaturization and weight reduction can be achieved.

[0079] Although some 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 implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

Explanation of Reference Numerals

[0080] 1... Rotating electrical machine, 10... Stator, 10-1, 10-2... Stator core, 10a... Outer diameter side surface, 10b... Core body, 10c... Core back portion, 10d... Inner diameter side surface, 11... Slot, 12... Armature coil, 13... Tooth portion, 14... Inlet, 15... Outlet, 16... Mounting hole, 17... Flow path, 18... Concavo-convex shaped portion, 19... Fin-shaped portion, 20... Rotor, 30... Rotating shaft, 40... Insulator.

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 can flow therethrough, the flow path having 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, being axially spaced apart from each other. 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 in 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 mounting holes for inserting mounting members are provided on the outer diameter side of the stator core, and the flow path has a flow path portion adjusted to be separated from the region of the mounting holes by a certain distance or more. A stator core of a rotating electrical machine.

9. The stator core of a rotating electrical machine according to Claim 1, wherein the plurality of teeth portions are arranged on the inner 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 the core back portion, being axially spaced apart from each other. 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 the 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 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 stator provided with an armature coil on the stator core according to any one of claims 1 to 14, a rotor arranged at a certain distance from the stator, a rotating electrical machine comprising the same.

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