CN116667558A

CN116667558A - Stator and motor

Info

Publication number: CN116667558A
Application number: CN202310607917.7A
Authority: CN
Inventors: 宗兆科; 蒋雯雯; 方亮
Original assignee: Wuxi Xingqu Technology Co ltd; Wuxi Xingqu Power Technology Co ltd; Zhejiang Geely Holding Group Co Ltd
Current assignee: Wuxi Xingqu Power Technology Co ltd; Wuxi Xingqu Technology Co ltd
Priority date: 2023-05-26
Filing date: 2023-05-26
Publication date: 2023-08-29

Abstract

A stator and a motor are provided herein. The stator includes a stator core; the stator core includes: the body is a hollow cylinder; the stator teeth are arranged on the body at intervals along the circumferential direction of the body, and stator grooves are formed between two adjacent stator teeth; a plurality of cooling channels arranged on the body and extending along the axial direction of the body; the radial distance from the cooling channel to the stator groove is not greater than the radial distance from the cooling channel to the outer contour surface of the body. Through arranging cooling channel more near the stator groove, can promote the radiating effect of setting up the stator coil in the stator groove, can promote the life of stator, and make the oil cooling motor can realize higher power density and torque density.

Description

Stator and motor

Technical Field

The present disclosure relates to the field of vehicle technologies, and in particular, to a stator and a motor.

Background

As a power source of the electric automobile, the motor in the power assembly realizes energy conversion of kinetic energy and electric energy. With the progress of intelligent and electric automobile technology, the power density and torque density of the motor are improved to the key positions. Under the same volume, the oil cooling motor can realize higher power density and torque density, but the existing oil cooling motor still cannot meet the design requirement of the electric automobile.

The foregoing is not necessarily a prior art, and falls within the technical scope of the inventors.

Disclosure of Invention

The application aims to provide a stator and a motor. The stator can improve the heat radiation capability of the oil-cooled motor, can take away the heat of the winding of the stator coil to a greater extent, and can enable the oil-cooled motor to achieve higher power density and torque density.

The technical scheme of the embodiment of the application is as follows:

a stator includes a stator core; the stator core includes:

the body is a hollow cylinder;

the stator teeth are arranged on the body at intervals along the circumferential direction of the body, and stator grooves are formed between two adjacent stator teeth;

a plurality of cooling channels arranged on the body and extending along the axial direction of the body;

the radial distance from the cooling channel to the stator groove is not greater than the radial distance from the cooling channel to the outer contour surface of the body.

Through arranging cooling channel more near the stator groove, can promote the radiating effect of setting up the stator coil in the stator groove, can promote the life of stator, and make the oil cooling motor can realize higher power density and torque density.

In some exemplary embodiments, a plurality of the cooling passages are arranged in a group opposite to a plurality of the stator grooves, and the dimension of the cooling passages along the circumferential direction of the body is not more than the dimension of the stator grooves along the circumferential direction of the body.

The plurality of cooling channels and the plurality of stator slots are oppositely arranged in a one-to-one group, so that the cooling effect on the stator coils in the stator slots can be improved, the energy consumption of the stator coils can be reduced, and the cooling cost is reduced.

In some exemplary embodiments, the stator further comprises a plurality of sets of stator coils, one set of the stator coils being wound around at least one of the stator teeth, each set of the stator coils comprising a plurality of windings;

the distance between the cooling channel and the stator groove which is arranged oppositely in the radial direction of the body is not more than the thickness of the winding.

Through setting up cooling channel and the radial interval of stator groove along the body that sets up relatively not exceeding the thickness of winding, can make cooling channel be close to the winding more, can promote the cooling effect to the winding.

In some exemplary embodiments, the plurality of cooling channels includes at least one first cooling channel and at least one second cooling channel;

wherein the radial distances from the inlets of the first cooling channels and the inlets of the second cooling channels to the central axis of the stator core are different.

The first cooling channel and the second cooling channel can be used for realizing various combination forms, and flexible adjustment capability of the cooling effect of the winding can be improved.

In some exemplary embodiments, the plurality of first cooling passages and the plurality of second cooling passages are alternately arranged in order along the circumferential direction of the stator core.

In some exemplary embodiments, the stator core includes at least one first stator unit and at least one second stator unit, the first stator unit is provided with at least one first runner extending along the axial direction of the stator core, the second stator unit is provided with at least one second runner extending along the axial direction of the stator core, and a plurality of the first runners and a plurality of the second runners are alternately communicated in turn along the axial direction of the stator core and form the first cooling channel, and an inlet of the first runner is an inlet of the first cooling channel.

The first stator unit and the second stator unit can be combined into the stator core, so that the flexible adjustment of the stator core structure can be realized, and the modularized design of the stator can be realized.

In some exemplary embodiments, the first flow channel outlet and the second flow channel inlet satisfy at least one of the following relationships:

the shape of the first runner outlet is different from the shape of the second runner inlet;

the central axis of the first runner outlet is not collinear with the central axis of the second runner inlet;

the flow area of the first flow channel outlet is different from the flow area of the second flow channel inlet.

By utilizing the difference of the structures and the relative arrangement of the first runner outlet and the second runner inlet, a turbulent flow structure can be formed at the communication position of the first runner and the second runner, so that cooling oil forms turbulent flow, the heat dissipation area is increased, the heat dissipation effect of the cooling oil can be improved, and the service life of the stator is prolonged.

In some exemplary embodiments, the radial distance of the first runner to the central axis of the stator core is different from the radial distance of the second runner to the central axis of the stator core.

The radial distance from the first runner to the central axis of the stator core is designed to be different from the radial distance from the second runner to the central axis of the stator core, so that the radial step feature of the stator core can be formed at the communication position of the first runner and the second runner, the cooling oil can form turbulent flow, and the heat dissipation effect of the cooling oil can be improved.

In some exemplary embodiments, the first stator unit is provided with at least one third flow passage extending along the axial direction of the stator core, the second stator unit is provided with at least one fourth flow passage extending along the axial direction of the stator core, and a plurality of the third flow passages and a plurality of the fourth flow passages are sequentially and alternately communicated along the axial direction of the stator core and form the second cooling passage, and an inlet of the third flow passage is an inlet of the second cooling passage.

In some exemplary embodiments, the radial distance from the first runner to the central axis of the stator core is the same as the radial distance from the fourth runner to the central axis of the stator core, and the radial distance from the second runner to the central axis of the stator core is the same as the radial distance from the third runner to the central axis of the stator core.

The modular design of the stator core can be realized, the structure of the second stator unit is identical with that of the first stator unit, the structural complexity of the stator core can be reduced, and the cost of the stator core can be reduced.

An electric machine comprising a stator as in any one of the embodiments above.

Other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.

Drawings

The accompanying drawings are included to provide a further understanding of the technology herein, and are incorporated in and constitute a part of this specification, illustrate technology herein and together with the description serve to explain, without limitation, the technology herein.

FIG. 1 is a partial schematic illustration of a stator in accordance with some illustrative embodiments of the application;

FIG. 2 is a partial schematic diagram II of a stator in some exemplary embodiments of the application;

FIG. 3 is an isometric view of a stator core in accordance with certain illustrative embodiments of the application;

FIG. 4 is an isometric view of a stator unit of a stator core in some exemplary embodiments of the application;

fig. 5 is a schematic front view of a stator unit of a stator core in some exemplary embodiments of the application;

FIG. 6 is an enlarged partial schematic view of a stator core in accordance with some exemplary embodiments of the application;

FIG. 7 is a schematic cross-sectional view of a stator core in accordance with some illustrative embodiments of the application;

FIG. 8 is a schematic cross-sectional view of a first cooling channel in some illustrative embodiments of the application;

FIG. 9 is a schematic cross-sectional view of a second cooling channel in some illustrative embodiments of the application.

Reference numerals:

10-stator core, 100-cooling channel, 10 a-first cooling channel, 10 b-second cooling channel, 10 c-central interface, 101-stator slot, 102-stator tooth, 103-protrusion, 104-first runner, 105-second runner, 106-third runner, 107-fourth runner, 108-body;

20-stator windings, 201-stator coils.

Detailed Description

The technical solutions herein are further described below by means of specific embodiments in combination with the accompanying drawings. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to be limiting.

In an embodiment of the present application, as shown in fig. 1 to 9, a stator that can be used in an electric motor is provided, and of course, the stator can also be used in other electrical components, which is not limited in this disclosure. The stator may include a stator core 10 and stator windings 20. The stator core 10 may include a body 108, and the body 108 may be provided as a hollow cylinder. The stator core 10 may also include a plurality of cooling passages 100 and a plurality of stator teeth 102. The plurality of stator teeth 102 are disposed on the body 108 at intervals along the circumferential direction of the body 108, and stator slots 101 are formed between two adjacent stator teeth 102. The plurality of cooling passages 100 may be provided on the body 108, and the cooling passages 100 extend in the axial direction of the body 108, and the plurality of cooling passages 100 may be uniformly arranged in the circumferential direction of the body 108. As shown in fig. 1, the radial distance from the cooling channel 100 to the stator slot 101 is not greater than the radial distance from the cooling channel 100 to the outer contour surface of the body 108, so that the cooling channel 100 is closer to the stator slot 101 in the radial direction of the body 108, which can enhance the cooling effect on the stator coil. The stator winding 20 may include a plurality of sets of stator coils 201, one set of stator coils 201 being wound around at least one stator tooth 101, as shown in fig. 2. The stator provided by the embodiment of the application can be applied to a wave winding motor, a centralized motor or a distributed lap winding motor and the like. A set of stator coils 201 may include multiple windings, multiple windings within the same set of stator coils 201 may be wound on the same stator tooth 102, or multiple windings within the same set of stator coils 201 may be wound on multiple stator teeth 102. The stator coil 201 may be made of copper wire or the like. The copper wire can be a round copper wire or a flat copper wire. The plurality of windings may include a hairpin winding, a UPIN winding, a WPIN winding, an XPIN winding, or the like.

In some exemplary embodiments, the cooling passages 100 may be disposed opposite the stator slots 101 in a group, and the size of the cooling passages 100 along the circumferential direction of the stator core 10 does not exceed the size of the stator slots 101 corresponding thereto along the circumferential direction of the stator core 10, and the size of the cooling passages 100 along the circumferential direction of the stator core 10 is equal to the size of the stator slots 101 corresponding thereto along the circumferential direction of the stator core 10, for example. In an embodiment of the application, the opposing arrangement means that there is at least a partial overlap of the projections of the cooling channels and the stator slots along the circumference of the body, i.e. that there is no spacing of the cooling channels and the stator slots along the circumference of the body.

In some exemplary embodiments, as shown in fig. 1, the spacing (W) between the cooling passages 100 and their corresponding stator slots 101 in the radial direction of the stator core 10 may be set to not exceed the thickness (H) of one winding of the stator coil 201, and, for example, the spacing (W) may be equal to the thickness (H) of the winding.

In some exemplary embodiments, as shown in fig. 1, the protrusions 103 may be disposed on the stator teeth 102, and the protrusions 103 may function to prevent the stator coil 201 from moving along the radial direction of the stator core 10, and may improve the stability of fixing the stator coil 201 and the accuracy of fixing the position.

In some exemplary embodiments, the body 108, the stator teeth 102, and the protrusions 103 may be integrally formed structures. By way of example, stamping processes and the like may be employed.

In some exemplary embodiments, the stator core 10 may be provided as a silicon steel core. The silicon steel iron core can be made of non-oriented silicon steel or oriented silicon steel.

In some exemplary embodiments, the stator core 10 may be provided to be combined by a plurality of stator units along an axial direction of the stator core 10. The combination method may be welding, clamping, bonding, riveting, or the like, and the combination method of the plurality of stator units in the stator core 10 is not limited in the embodiment of the present application. The stator core 10 may include at least one first stator unit and at least one second stator unit. At least one first flow passage 104 extending along the axial direction of the stator core 10 is provided in the first stator unit, at least one second flow passage 105 extending along the axial direction of the stator core 10 is provided in the second stator unit, and the first flow passage 104 communicates with the second flow passage 105 so that cooling oil can flow in the first flow passage 104 and the second flow passage 105 to cool the stator core 10 and the stator winding 20. In the embodiment of the present application, the cooling oil flows out of the first flow passage 104 and then flows into the second flow passage 105 along the flow direction of the cooling oil.

In some exemplary embodiments, the at least one first flow passage 104 and the at least one second flow passage 105 are alternately arranged in order along the axial direction of the stator core 10 to form a first cooling passage extending along the axial direction of the stator core 10. The plurality of cooling passages 100 may include a plurality of first cooling passages 10a. As shown in fig. 8, taking the stator core 10 as an example in which four first stator units and four second stator units are combined, the first cooling passage 10a is formed by combining four first flow passages 104 and four second flow passages 105. The cooling oil flows out of the first flow passage 104 and then flows into the first second flow passage 105, then flows out of the first second flow passage 105 and then flows into the second first flow passage 104, then flows out of the second first flow passage 104 and then flows into the second flow passage 105, then flows out of the second flow passage 105 and then flows into the third first flow passage 104, then flows out of the third first flow passage 104 and then flows into the fourth first flow passage 104, and then flows out of the fourth first flow passage 104 and then flows into the fourth second flow passage 105 along the direction indicated by the arrow.

In some exemplary embodiments, as shown in fig. 8, the outlet of the first flow channel 104 is communicated with the inlet of the second flow channel 105, and the central axis of the outlet of the first flow channel 104 is not collinear with the central axis of the inlet of the second flow channel 105, so that the cooling oil forms turbulence in the area where the first flow channel 104 is communicated with the second flow channel 105, which can improve the flowing heat exchange performance of the cooling oil and the cooling effect of the stator and the motor.

In some exemplary embodiments, the flow area of the first flow channel 104 near the outlet area is different from the flow area of the second flow channel 105 near the inlet area, so that the cooling oil forms turbulence in the area where the first flow channel 104 and the second flow channel 105 are communicated, the flow heat exchange performance of the cooling oil can be improved, and the cooling effect of the stator and the motor is improved.

In some exemplary embodiments, the shape of the outlet of the first flow channel 104 is different from the shape of the inlet of the second flow channel 105, so that the cooling oil forms turbulence in the area where the first flow channel 104 is communicated with the second flow channel 105, the flow heat exchange performance of the cooling oil can be improved, and the cooling effect of the stator and the motor can be improved.

In some exemplary embodiments, the central axis of the outlet of the first flow channel 104 is collinear with the central axis of the inlet of the second flow channel 105, and the flow area of the first flow channel 104 near the outlet is different from the flow area of the second flow channel 105 near the inlet, so that the cooling oil forms turbulence in the area where the first flow channel 104 is communicated with the second flow channel 105, which can improve the flow heat exchange performance of the cooling oil and the cooling effect of the stator and the motor.

In some exemplary embodiments, the shape of the outlet of the first flow channel 104 is the same as the shape of the inlet of the second flow channel 105, the flow area of the outlet of the first flow channel 104 is the same as the flow area of the inlet of the second flow channel 105, and the central axis of the outlet of the first flow channel 104 is not collinear with the central axis of the inlet of the second flow channel 105, so that the cooling oil forms turbulence in the area where the first flow channel 104 is communicated with the second flow channel 105, the flow heat exchange performance of the cooling oil can be improved, and the cooling effect of the stator and the motor can be improved.

In some exemplary embodiments, the radial distance from the first flow passage 104 to the central axis of the stator core 10 is different from the radial distance from the second flow passage 105 to the central axis of the stator core 10, a step along the radial direction of the stator core 10 may be formed at the communication position between the first flow passage 104 and the second flow passage 105, so that the cooling oil forms turbulence in the area where the first flow passage 104 and the second flow passage 105 are communicated, the flow heat exchange performance of the cooling oil may be improved, and the cooling effect of the stator and the motor may be improved.

In some exemplary embodiments, the first flow passage 104 may be a flow passage of equal flow area along the axial direction of the stator core 10.

In some exemplary embodiments, the second flow passage 105 may be a flow passage of equal flow area along the axial direction of the stator core 10.

In some exemplary embodiments, the inlet of the first flow passage 104 may be a circular hole, an elliptical hole, or the like. The outlet of the first flow passage 104 may be a circular hole, an elliptical hole, or the like. The shape of the inlet of the first flow channel 104 and the outlet of the first flow channel 104 may be the same or different.

In some exemplary embodiments, the inlet of the second flow channel 105 may be a circular hole, an elliptical hole, or the like. The outlet of the second flow channel 105 may be a circular or oval hole or the like. The shape of the inlet of the second flow path 105 and the outlet of the second flow path 105 may be the same or different.

In some exemplary embodiments, at least one third flow passage 106 extending along the axial direction of the stator core 10 is provided in the first stator unit, at least one fourth flow passage 107 extending along the axial direction of the stator core 10 is provided in the second stator unit, and the third flow passage 106 communicates with the fourth flow passage 107 so that cooling oil can flow in the third flow passage 106 and the fourth flow passage 107 to cool the stator core 10 and the stator winding 20. In the embodiment of the present application, the cooling oil flows out from the third flow passage 106 and then flows into the fourth flow passage 107 along the flow direction of the cooling oil.

In some exemplary embodiments, the at least one third flow passage 106 and the at least one fourth flow passage 107 are alternately arranged in order along the axial direction of the stator core 10 to form the second cooling passage 10b extending along the axial direction of the stator core 10. The plurality of cooling passages 100 may include a plurality of second cooling passages 10b. As shown in fig. 9, taking the stator core 10 as an example of a combination of four first stator units and four second stator units, the second cooling passage 10b is formed by a combination of four third flow passages 106 and four fourth flow passages 107. The cooling oil flows out of the first third flow passage 106 and then flows into the first fourth flow passage 107, flows out of the first fourth flow passage 107 and then flows into the second third flow passage 106, flows out of the second third flow passage 106 and then flows into the second fourth flow passage 107, flows out of the second fourth flow passage 107 and then flows into the third flow passage 106, flows out of the third flow passage 106 and then flows into the third fourth flow passage 107, flows out of the third fourth flow passage 107 and then flows into the fourth third flow passage 106, and flows out of the fourth third flow passage 106 and then flows into the fourth flow passage 107, and in this way, a turbulent flow is formed at the communication position of the cooling oil and the fourth flow passage 107 each time in the flowing process of the cooling oil, so that the heat dissipation effect of the cooling oil can be improved.

In some exemplary embodiments, as shown in fig. 9, the outlet of the third flow channel 106 is communicated with the inlet of the fourth flow channel 107, and the central axis of the outlet of the third flow channel 106 is not collinear with the central axis of the inlet of the fourth flow channel 107, so that the cooling oil forms turbulence in the area where the third flow channel 106 is communicated with the fourth flow channel 107, which can improve the flow heat exchange performance of the cooling oil and the cooling effect of the stator and the motor.

In some exemplary embodiments, the flow area of the third flow channel 106 near the outlet is different from the flow area of the fourth flow channel 107 near the inlet, so that the cooling oil forms turbulence in the area where the third flow channel 106 and the fourth flow channel 107 are communicated, which can improve the flow heat exchange performance of the cooling oil and improve the cooling effect of the stator and the motor.

In some exemplary embodiments, the shape of the outlet of the third flow channel 106 is different from the shape of the inlet of the fourth flow channel 107, so that the cooling oil forms turbulence in the area where the third flow channel 106 and the fourth flow channel 107 are communicated, and the flow heat exchange performance of the cooling oil can be improved, and the cooling effect of the stator and the motor can be improved.

In some exemplary embodiments, the central axis of the outlet of the third flow channel 106 is collinear with the central axis of the inlet of the fourth flow channel 107, and the flow area of the third flow channel 106 near the outlet is different from the flow area of the fourth flow channel 107 near the inlet, so that the cooling oil forms turbulence in the area where the third flow channel 106 and the fourth flow channel 107 are communicated, the flow heat exchange performance of the cooling oil can be improved, and the cooling effect of the stator and the motor can be improved.

In some exemplary embodiments, the radial distance from the third flow passage 106 to the central axis of the stator core 10 is different from the radial distance from the fourth flow passage 107 to the central axis of the stator core 10, a step along the radial direction of the stator core 10 may be formed at the connection position between the third flow passage 106 and the fourth flow passage 107, so that the cooling oil forms turbulence in the area where the third flow passage 106 and the fourth flow passage 107 are connected, the flow heat exchange performance of the cooling oil may be improved, and the cooling effect of the stator and the motor may be improved.

In some exemplary embodiments, the third flow passage 106 may be a flow passage of equal flow area along the axial direction of the stator core 10.

In some exemplary embodiments, the fourth flow passage 107 may be a flow passage of equal flow area along the axial direction of the stator core 10.

In some exemplary embodiments, the inlet of the third flow passage 106 may be a circular hole, an elliptical hole, or the like. The outlet of the third flow passage 106 may be a circular hole, an elliptical hole, or the like. The shape of the inlet of the third flow channel 106 and the outlet of the third flow channel 106 may be the same or different.

In some exemplary embodiments, the inlet of the fourth flow passage 107 may be a circular hole or an elliptical hole, etc. The outlet of the fourth flow passage 107 may be a circular hole, an elliptical hole, or the like. The shape of the inlet of the fourth flow channel 107 and the outlet of the fourth flow channel 107 may be the same or different.

In some exemplary embodiments, the radial distance from the first runner 104 to the central axis of the stator core 10 is the same as the radial distance from the fourth runner 107 to the central axis of the stator core 10, the radial distance from the second runner 105 to the central axis of the stator core 10 is the same as the radial distance from the third runner 106 to the central axis of the stator core 10, and the modular design of the first stator unit and the second stator unit can be achieved, the number of parts in the stator can be reduced, and the product cost can be reduced.

In some exemplary embodiments, as shown in fig. 6, a plurality of first cooling passages 10a and a plurality of second cooling passages 10b are alternately arranged in order along the circumferential direction of the stator core 10.

In some exemplary embodiments, as shown in fig. 6, the inlet of the first cooling passage 10a is located at a side of the stator slot 101 away from the central axis of the stator core 10, and the inlet of the first cooling passage 10a may be located between the stator slot 101 and the central interface 10c, or the inlet of the first cooling passage 10a may be disposed on the central interface 10c. The center interface 10c is a cylindrical surface extending axially along the stator core 10 from the stator slot 101 to the center of the outer contour edge of the body 108. In an embodiment of the present application, the body 108 includes oppositely disposed inner and outer contoured edges, and the stator teeth 102 are disposed on the inner contoured edge of the body 108 and extend toward the center of the stator core 10. The outer contoured edge of the body 108 is the contoured edge of the side of the body 108 remote from the stator teeth 102.

In some exemplary embodiments, the first cooling channel 10a is located between the stator slot 101 and the center interface 10c, and the first cooling channel 10a is disposed close to the stator slot 101, so that the cooling effect of the cooling oil on the stator coil can be improved, the service life of the stator can be prolonged, and the torque density and the power density of the motor can be improved.

In some exemplary embodiments, the inlet of the second cooling passage 10b is located at a side of the stator slot 101 away from the central axis of the stator core 10, the inlet of the second cooling passage 10b is located between the stator slot 101 and the central interface 10c, or the inlet of the second cooling passage 10b is located at the central interface 10c.

In some exemplary embodiments, the second cooling channel 10b is located between the stator slot 101 and the center interface 10c, and the second cooling channel 10b is disposed close to the stator slot 101, so that the cooling effect of the cooling oil on the stator coil can be improved, the service life of the stator can be prolonged, and the torque density and the power density of the motor can be improved.

In some exemplary embodiments, the cooling channel 100 is located between the stator slot 101 and the center interface 10c.

In some exemplary embodiments, as shown in fig. 6, the radial distances from the inlets of the first cooling passages 10a and the inlets of the second cooling passages 10b to the central axis of the stator core 10 are not the same, and thus the adjustment capability of the cooling effect can be improved.

The embodiment of the application provides a stator, which can improve the heat radiation capability of an oil-cooled motor, can take away the heat of a winding of a stator coil to a greater extent, and can enable the oil-cooled motor to realize higher power density and torque density. Compared with the technical scheme that the cooling channels are arranged close to the outer contour surface of the body of the stator, the stator provided by the embodiment of the application has larger benefits for improving the continuous power and the peak power ratio of the motor by arranging the cooling channels closer to the stator grooves under the condition that indexes such as motor torque, power, efficiency and NVH (Noise, vibration, harshness) are evaluated to meet the performance requirement of the whole vehicle.

In yet another embodiment of the present application, an electric machine is also provided. The motor comprises the stator according to any of the embodiments, so that the motor has all the advantages described above and will not be described in detail herein.

In the description herein, the terms "upper," "lower," "one side," "another side," "one end," "another end," "sides," "opposite," "four corners," "perimeter," and the like are used for convenience in describing embodiments of the present application and simplifying the description, and do not denote or imply that the structures referred to have a particular orientation, are configured and operated in a particular orientation, and are not to be construed as limitations herein.

In the description of embodiments of the present application, unless explicitly stated and limited otherwise, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," "assembled" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, and may also be in communication between two elements. The specific meaning of the terms herein above will be understood to those of ordinary skill in the art in a specific context.

While the embodiments disclosed herein are described above, the descriptions are presented only to facilitate an understanding of the embodiments disclosed herein and are not intended to limit the scope of the present disclosure. Any person skilled in the art may make any modifications and variations in form and detail of the implementations without departing from the spirit and scope of the disclosure, but the scope of the claims herein shall be defined by the appended claims.

Claims

1. A stator includes a stator core; the stator core is characterized by comprising:

the body is a hollow cylinder;

2. The stator according to claim 1, wherein a plurality of said cooling passages are provided in a set of opposed relation to a plurality of said stator slots, and wherein a dimension of said cooling passages in a circumferential direction of said body does not exceed a dimension of said stator slots in said circumferential direction of said body.

3. The stator of claim 2, further comprising a plurality of sets of stator coils, one set of stator coils wound around at least one of the stator teeth, each set of stator coils comprising a plurality of windings;

4. A stator according to any one of claims 1 to 3, wherein a plurality of said cooling channels comprises at least one first cooling channel and at least one second cooling channel;

5. The stator according to claim 4, wherein the plurality of first cooling passages and the plurality of second cooling passages are alternately arranged in order in the circumferential direction of the stator core.

6. The stator of claim 4, wherein the stator core includes at least one first stator unit and at least one second stator unit, the first stator unit is provided with at least one first runner extending axially along the stator core, the second stator unit is provided with at least one second runner extending axially along the stator core, and a plurality of the first runners and a plurality of the second runners are alternately communicated in turn along the stator core axially and form the first cooling channel, and an inlet of the first runner is an inlet of the first cooling channel.

7. The stator of claim 6, wherein the first flow channel outlet and the second flow channel inlet satisfy at least one of the following relationships:

8. The stator of claim 7, wherein a radial distance from the first runner to a central axis of the stator core is different from a radial distance from the second runner to the central axis of the stator core.

9. The stator according to claim 6, wherein the first stator unit is provided with at least one third flow passage extending along the axial direction of the stator core, the second stator unit is provided with at least one fourth flow passage extending along the axial direction of the stator core, and a plurality of the third flow passages and a plurality of the fourth flow passages are alternately communicated in turn along the axial direction of the stator core and form the second cooling passage, and an inlet of the third flow passage is an inlet of the second cooling passage.

10. The stator of claim 9, wherein a radial distance from the first runner to a central axis of the stator core is the same as a radial distance from the fourth runner to a central axis of the stator core, and a radial distance from the second runner to a central axis of the stator core is the same as a radial distance from the third runner to a central axis of the stator core.

11. An electric machine comprising a stator as claimed in any one of claims 1 to 10.