JP-2026076112-A - Stator core and rotating electric machine

JP2026076112AJP 2026076112 AJP2026076112 AJP 2026076112AJP-2026076112-A

Abstract

[Problem] To provide a stator core for a rotating electric machine that improves cooling performance with a simple configuration. [Solution] The stator core of the rotating electric machine comprises an annular core back portion 14, a teeth portion 13, and a magnetic shielding cover. The first and second end-extended core portions 15, which have a structure in which both axial ends of the stator core are extended outwards, comprise a refrigerant inlet 61 and a refrigerant outlet, and first and second header flow paths 63 formed so that the refrigerant flows in the circumferential direction. The teeth portion comprises a teeth flow path through which the refrigerant flows in the axial direction, a plurality of teeth inlets 64 that connect the first header flow path and the teeth flow path, and a plurality of teeth outlets that connect the teeth flow path and the second header flow path. The refrigerant supplied from the outside flows sequentially through the refrigerant inlet, the first header flow path, the teeth inlet, the teeth flow path, the teeth outlet, the second header flow path, and the refrigerant outlet, and flows out to the outside. [Selection Diagram] Figure 3

Inventors

加幡安雄
栗原佳子
清水伸一
大崎敏幸
瀬川和之

Assignees

株式会社東芝
東芝エネルギーシステムズ株式会社

Dates

Publication Date: 20260511
Application Date: 20250911
Priority Date: 20241023

Claims (9)

A stator core for a rotating electric machine, comprising an annular core back portion and a plurality of teeth portions extending toward the inner diameter side of the core back portion, and further provided with a magnetic shielding cover on the outer circumference side of the core back portion, The stator core has a structure in which each of the axial ends is extended outwards, and the first and second end-extended core portions are provided. The first and second end expansion core portions are respectively provided with a refrigerant inlet and a refrigerant outlet, The first and second end extension core portions are provided with first and second header flow paths, which are formed so that the refrigerant flows in the circumferential direction, A tooth section flow path is formed so that the refrigerant flows in the axial direction inside each of the plurality of tooth sections, Multiple tooth section inlets that connect the first header flow path and the tooth section flow path, Multiple tooth outlets that connect the tooth section flow path and the second header flow path, It is equipped with, A stator core of a rotating electric machine is configured such that a refrigerant supplied from an external source flows in through the refrigerant inlet, sequentially through the first header flow path, the multiple tooth section inlets, the tooth section flow paths, the multiple tooth section outlets, and the second header flow path, and flows out to the outside through the refrigerant outlet.
In the stator core of the rotating electric machine according to claim 1, A stator core for a rotating electric machine, wherein at least one of the multiple toothed inlets and multiple toothed outlets is formed such that the shape of part or all of them increases towards the outer diameter.
In the stator core of the rotating electric machine according to claim 1, A stator core for a rotating electric machine, wherein at least one of the refrigerant inlet and refrigerant outlet is formed such that part or all of its shape is such that the flow path width widens towards the inner diameter.
In the stator core of the rotating electric machine according to claim 1, A stator core of a rotating electric machine, wherein at least one of the refrigerant inlet and the refrigerant outlet is equipped with a mechanism for leveling the flow velocity distribution.
In the stator core of the rotating electric machine according to claim 1, A stator core for a rotating electric machine, wherein at least one of the first and second header flow paths is formed such that part or all of its shape increases as it approaches the refrigerant inlet or outlet.
In the stator core of the rotating electric machine according to claim 1, A stator core for a rotating electric machine, wherein at least one of the first and second header flow paths and the tooth section flow path is provided with a coolant reservoir in a part thereof, the circumferential flow path width being expanded.
In the stator core of the rotating electric machine according to claim 6, A stator core of a rotating electric machine, wherein at least a portion of the refrigerant reservoir is configured to extend obliquely with respect to the axial direction.
In the stator core of the rotating electric machine according to claim 1, The first and second end extension core portions are arranged to sandwich the magnetic shielding cover from both axial ends, forming a stator core for a rotating electric machine.
A rotating electric machine comprising a stator having an armature coil provided on a stator core as described in any one of claims 1 to 8, and a rotor positioned at a certain distance from the stator.

Description

Embodiments of the present invention relate to a stator core for a rotating electric machine and a rotating electric machine. An example of the structure of a conventional rotating electric machine will be explained using Figures 12 and 13. Figure 12 shows an example of the cross-sectional shape of a conventional rotating electric machine when viewed in the axial direction. Figure 13 shows an example of the cross-sectional shape of the conventional rotating electric machine shown in Figure 12 when viewed in the circumferential direction. A rotating electric machine, such as an electric motor or generator, comprises a stator 10 and a rotor 20, arranged concentrically. The rotor 20 rotates around a rotation axis 30. The rotor 20 is positioned at a certain distance from the stator 10, and a certain gap is provided between the stator 10 and the rotor 20. 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 slots 11 and the armature coil 12, and a wedge (not shown) is also provided to prevent the armature coil 12 from popping out. Furthermore, Figure 12 shows an example where the individual coil pieces constituting the armature coil 12 are stacked radially within the slot 11 of the rotating electric machine; however, there are also configurations where the coil pieces are dispersed within the slot 11. The stator core 10A in the stator 10 consists of an annular core back portion and teeth portions located on the inner diameter side of the core back portion. A magnetic shielding cover (magnetic shield) 50 is provided on the outer circumference of the core back portion. The aforementioned slots 11 are formed between adjacent teeth portions. Individual coil pieces of the armature coil 12 are housed in the slots 11, insulated by an insulating material. Conventionally, the stator core 10A of a rotating electric machine, such as the stator core of an electric motor or generator, primarily uses metal as its material. The stator core is made of a soft magnetic material, such as electromagnetic steel sheet, and forms a bulk body or a laminated structure by stacking these materials. The main role and effect of the stator core is to act as a path for the magnetic field generated inside the rotating electric machine, thereby providing driving force. Since iron conducts magnetic fields approximately 1000 times more easily than air, using a core allows for efficient transfer of magnetic flux between the rotor and stator armature coils, reducing leakage flux and increasing driving force. The stator core not only provides electrical effects but also plays a crucial role in structural design. Specifically, the stator core has multiple slots 11 arranged circumferentially, primarily on the inner diameter side of its structure. The armature coils 12 are housed within these slots, thereby providing resistance to external stresses such as vibrations that the assembled stator will experience, and thus improving its mechanical strength. Furthermore, the stator core serves as a reference point for the relative positional relationships between various parts, such as gaps, as well as for positioning, including concentricity and shaft alignment. This helps reduce manufacturing dimensional tolerances during the assembly of electric motors or generators, thereby contributing to improved accuracy. Japanese Patent Publication No. 2014-093827 Figure 1 is a perspective view showing a part of the stator of a rotating electric machine according to an embodiment.Figure 2 is an axial cross-sectional view showing an example of the cross-sectional shape of a part of the stator of the rotating electric machine shown in Figure 1, viewed in the circumferential direction.Figure 3 shows the cross-sectional shape of the portion of the stator core 10A that includes the first end extension core portion 15.Figure 4 shows the cross-sectional shape of the central part of the stator core 10A.Figure 5 is an axial cross-sectional view showing an example of another cross-sectional shape when a part of the stator of the rotating electric machine shown in Figure 1 is viewed in the circumferential direction.Figure 6 shows a modified example of the shape of the refrigerant reservoir 66 shown in Figure 5.Figure 7 shows a first modified example of the refrigerant inlet 61.Figure 8 shows a second modified example of the refrigerant inlet 61.Figure 9 shows a modified example of the first header flow path 63.Figure 10 is a graph showing the "flow velocity distribution" of the refrigerant superimposed on an axial cross-sectional view of a portion of the stator 10.Figure 11 is a graph showing the "temperature distribution" of the refrigerant superimposed on an axial cross-sectional view of a portion of the stator 10.Figure 12 shows an example of the cross-sectional shape of a conventional rotating electric machine when viewed in the axi