stator

Abstract

The utility model discloses a through simple constitution more effectively cool stator technology. Stator has: stator core, along the axial extension into the cylinder shape, and stator coil, set up in stator core. The inside of stator core is provided with the refrigerant flow path along the axial extension, and the refrigerant flow path is constituted to be the section area of the outlet vicinity of refrigerant less than the section area of other parts.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a stator. In particular, it relates to a stator for a motor. Background Technology

[0002] Patent Document 1 discloses a stator for a motor. This stator includes: a stator core extending axially into a cylindrical shape; and a stator coil disposed within the stator core. Inside the stator core, a plurality of refrigerant flow paths extending axially are arranged circumferentially. Refrigerant flowing through the refrigerant flow paths is supplied to the coil end (the axial end of the stator coil) protruding from the end face of the stator core. Thus, the interior of the stator core is cooled by the refrigerant, and the coil end is also cooled.

[0003] Patent Document 1: International Publication No. 2022 / 195920 Utility Model Content

[0004] As described above, it is effective to cool the stator simultaneously, both inside the stator core and at the ends of the coils. This specification provides a technique for more effectively cooling the stator through a simple configuration.

[0005] The stator disclosed in this specification comprises: a stator core extending axially into a cylindrical shape; and a stator coil disposed in the stator core. A refrigerant flow path extending axially is provided inside the stator core, wherein the cross-sectional area near the refrigerant outlet is smaller than the cross-sectional area of ​​other portions of the refrigerant flow path.

[0006] In the above structure, the refrigerant flow path is configured such that the cross-sectional area near the refrigerant outlet is smaller than that of other parts. Therefore, near the outlet, the refrigerant velocity is higher than in other parts, and the refrigerant is discharged from the outlet of the refrigerant flow path at high speed. Thus, even with a relatively small amount of refrigerant, the refrigerant can be effectively supplied to the coil ends. Furthermore, the large cross-sectional area of ​​the refrigerant flow path, except near the refrigerant outlet, ensures sufficient contact area between the refrigerant and the stator core, effectively cooling the stator core. Attached Figure Description

[0007] Figure 1 This is a cross-sectional view of the motor 2 involved in the embodiment.

[0008] Figure 2 It is along Figure 1 A sectional view cut along line II-II.

[0009] Figure 3 This is a partial cross-sectional view showing the structure of the refrigerant flow path 30. Detailed Implementation

[0010] (Example)

[0011] Referring to the accompanying drawings, the stator 10 and the motor 2 equipped with the stator 10 of the embodiment will be described. While not particularly limited, the motor 2 can be used as a prime mover to drive the wheels in an electric vehicle. Electric vehicles include, for example, battery electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, and fuel cell electric vehicles.

[0012] like Figure 1 and Figure 2 As shown, the motor 2 includes a rotor 4 and a stator 10. The rotor 4 is located inside the stator 10 and is rotatably supported about a central axis C. The rotor 4 includes a shaft 6 and a rotor core 8 fixed to the shaft 6. The rotor core 8 is constructed using a soft magnetic material. Although this is just one example, the rotor core 8 in this embodiment has a structure of stacked electromagnetic steel plates. Furthermore, a plurality of permanent magnets (not shown) are arranged on the rotor core 8 along the circumferential direction R.

[0013] The stator 10 includes a stator core 12, stator coils 18, and a housing 20. The stator core 12 is constructed using a soft magnetic material. Although an example, the stator core 12 of this embodiment has a structure consisting of multiple stacked electromagnet plates (not shown). The stator core 12 has a core back 14 extending axially (along the direction of the central axis C) into a cylindrical shape and multiple teeth 16 disposed on the inner circumferential surface 14a of the core back 14. Figure 2 As shown, a plurality of teeth 16 are arranged at equal intervals along the circumferential direction R. Each tooth 16 protrudes from the inner circumferential surface 14a of the core back 14 toward the central axis C. The housing 20 is configured to surround the outer circumferential surface 14b of the core back 14.

[0014] Stator coils 18 are disposed on multiple teeth 16. Each stator coil 18 consists of multiple coils, each coil configured to surround one or more corresponding teeth 16. For example... Figure 1 As shown, in the axial direction, the two ends 18a and 18b of the stator coil 18 protrude from the stator core 12.

[0015] Multiple refrigerant flow paths 30 are arranged inside the core back 14. For example... Figure 2As shown, multiple refrigerant flow paths 30 are arranged circumferentially R near the outer peripheral surface 14b of the core back 14. The multiple refrigerant flow paths 30 can be provided across the entire circumference of the core back 14, or only within a portion of the circumferential R of the core back 14. In this embodiment, refrigerant flow paths 30 are respectively provided between two adjacent teeth 16 in the circumferential R. Each refrigerant flow path 30 extends axially and reaches the first end face 14c and the second end face 14d of the core back 14 in the axial direction. The specific configuration of each refrigerant flow path 30 is not particularly limited. For example, the cross-sectional shape of each refrigerant flow path 30 can be rectangular, circular, or other shapes. Furthermore, each refrigerant flow path 30 can be arranged in two or more rows along the circumferential R. Each refrigerant flow path 30 is a flow path for allowing refrigerant to circulate. The refrigerant can be any heat medium used for cooling, such as liquid oil. Hereinafter, the end on the second end face 14d side of the refrigerant flow path 30 will be referred to as the inlet 30a, and the end on the first end face 14c side of the refrigerant flow path 30 will be referred to as the outlet 30b.

[0016] In the stator 10 of this embodiment, refrigerant is supplied from the inlet 30a located on the second end face 14d side to the refrigerant flow path 30 provided on the stator core 12 (core back 14). The refrigerant supplied into the refrigerant flow path 30 flows toward the first end face 14c of the core back 14 and is discharged from the outlet 30b located on the first end face 14c side of the refrigerant flow path 30.

[0017] Next, the detailed structure of the refrigerant flow path 30 will be explained. For example... Figure 3 As shown, the refrigerant flow path 30 is configured such that the cross-sectional area of ​​the portion 50A near the outlet 30b is smaller than the cross-sectional area of ​​other portions 50B (i.e., the range from the inlet 30a to portion 50A in the refrigerant flow path 30). The ratio of portion 50A to portion 50B is not particularly limited; for example, portion 50B extends from the middle position in the axial direction of the refrigerant flow path 30 to the outlet 30b side. The cross-sectional area of ​​portion 50A only needs to be smaller than the cross-sectional area of ​​portion 50B; for example, it can be constant along the axial direction or gradually decrease from the second end face 14d side towards the first end face 14c side. Furthermore, the cross-sectional area of ​​portion 50B only needs to be larger than the cross-sectional area of ​​portion 50A; it can have a constant cross-sectional area along the axial direction or it can have locally different cross-sectional areas.

[0018] As described above, in the stator 10 of this embodiment, the cross-sectional area of ​​the portion 50A near the refrigerant outlet 30b in the refrigerant flow path 30 is smaller than the cross-sectional area of ​​other portions 50B. Therefore, in portion 50A, compared with other portions 50B, the flow velocity of the refrigerant flowing through the refrigerant flow path 30 is greater, and the refrigerant is discharged from the outlet 30b of the refrigerant flow path 30 at high speed. Therefore, even with a relatively small amount of refrigerant, the refrigerant can be effectively supplied to one end 18a (coil end) of the stator coil 18. Furthermore, in the portion 50B other than near the refrigerant outlet 30b, the cross-sectional area of ​​the refrigerant flow path 30 is large, thus ensuring the contact area between the refrigerant and the stator core 12 (core back 14), and effectively cooling the stator core 12.

[0019] Symbol Explanation

[0020] 2-Motor, 4-Rotor, 6-Shaft, 8-Rotor core, 10-Stator, 12-Stator core, 14-Core back, 14a-Inner circumferential surface, 14b-Outer circumferential surface, 14c-First end face, 14d-Second end face, 16-Tooth, 18-Stator coil, 20-Housing, 30-Refrigerant flow path, 30a-Inlet, 30b-Outlet.

Claims

1. A stator for a motor, characterized by have: The stator core extends axially into a cylindrical shape; and Stator coils, which are disposed in the stator core, A refrigerant flow path extending along the axial direction is provided inside the stator core. The refrigerant flow path is configured such that the cross-sectional area near the refrigerant outlet is smaller than the cross-sectional area of ​​other parts.

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