Motor stator, motor, electric drive system and vehicle

Abstract

The utility model provides a motor stator, a motor, an electric drive system and a vehicle, and the motor stator comprises a stator main body and a plurality of cooling parts disposed at the circumferential outer side of the stator main body. The cooling part comprises a cooling groove and a communication port, the cooling groove is communicated with the outer side of the stator body through the communication port, the cross section of the cooling groove extends in the circumferential direction of the stator body, and the length of the cooling groove is larger than the width of the communication port, so that the contact area between cooling oil and the stator body when the cooling oil flows through the stator can be increased, and the heat dissipation effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor cooling, and in particular to a motor stator, a motor, an electric drive system and a vehicle. Background Art

[0002] With the rapid popularization of new energy vehicles, electric drive systems are developing rapidly towards high power density, low cost, high integration and high efficiency. Under this trend, high power density requires high motor power and compact size. However, the internal heat of high power density motors is difficult to dissipate effectively, resulting in motor overheating, which in turn causes irreversible component damage and rotor demagnetization.

[0003] In the related technologies, the traditional water cooling method can no longer meet the heat dissipation requirements. At present, oil cooling technology has gradually become the preferred solution for cooling the motors of new energy vehicles due to its excellent insulation properties. The cooling oil is sprayed to the outside of the stator and the end of the winding through the spray pipe or spray ring, and the heat on the stator is removed by the flow of the cooling oil.

[0004] However, in the current heat dissipation method of the motor, the contact area between the cooling oil and the stator is small, and the heat dissipation effect is poor. Utility Model Content

[0005] The utility model provides a motor stator, a motor, an electric drive system and a vehicle, so as to solve the technical problem that in the current heat dissipation mode of the motor, the contact surface between the cooling oil and the stator is small and the heat dissipation effect is poor.

[0006] In a first aspect, the utility model provides a motor stator, which includes a stator body and a plurality of cooling parts arranged on the circumferential outer side of the stator body; the cooling part includes a cooling groove and a connecting port, and the cooling groove is connected to the outer side of the stator body through the connecting port.

[0007] The cross section of the cooling groove extends along the circumferential direction of the stator body, and the length of the cooling groove is greater than the width of the connecting port.

[0008] The motor electronics provided in the embodiment of the present application is provided with a cooling portion on the circumferential outer side of the stator body, thereby forming a cooling groove for cooling oil to flow on the outer side of the stator body, so as to increase the contact area between the cooling oil and the stator body when flowing through the stator, thereby improving the heat dissipation effect.

[0009] In some embodiments, the cooling groove may penetrate through both ends of the stator body in a radial direction of the stator body.

[0010] Such an arrangement allows the cooling oil to flow through the outer side of the stator body in the radial direction of the stator body, thereby taking away heat more efficiently.

[0011] In some embodiments, the cooling groove is elliptical; wherein the major axis dimension of the cooling groove may be greater than or equal to 3 mm and less than or equal to 4 mm.

[0012] Such an arrangement can prevent the cooling groove from significantly changing the outer structure of the stator body and prevent the electronic functions of the motor from being affected.

[0013] In some embodiments, the distance between the side wall of the cooling groove away from the connecting port and the outer wall of the stator body may be greater than or equal to 1.5 mm and less than or equal to 2.5 mm.

[0014] Such an arrangement ensures that the cooling groove has a sufficient flow cross section while preventing the cooling groove from being too deep in the radial direction of the stator body to affect the motor performance.

[0015] In some embodiments, the groove wall of the cooling groove may include a first arc segment, a second arc segment and a third arc segment, the first arc segment is connected to the side wall of the connecting port, the second arc segment is connected to the first arc segment, and the third arc segment is connected to the second arc segment.

[0016] In some embodiments, the third arc segment is disposed opposite to the communication port, and the third arc segment is symmetrical with respect to the central axis of the communication port.

[0017] In some embodiments, the arc radius of the first arc segment and the third arc segment is greater than the arc radius of the second arc segment.

[0018] In some embodiments, there are two first arc segments and two second arc segments, and the two second arc segments are connected on both sides of the third arc segment; the two first arc segments are respectively connected to the ends of the two second arc segments facing away from the third arc segment, and the ends of the two first arc segments away from the second arc segments are respectively connected to the side walls on both sides of the connecting port.

[0019] In some embodiments, a length dimension of the communication opening along the radial direction of the stator body may be greater than or equal to 0.5 mm.

[0020] Such an arrangement ensures that the corners of the communication opening have sufficient structural strength on the outside of the stator body, thereby avoiding deformation or damage during installation or transportation.

[0021] In some embodiments, the width dimension of the communication opening may be greater than or equal to 1 mm.

[0022] Such an arrangement allows the cooling oil to flow freely into and out of the cooling groove in the radial direction of the stator body, thereby preventing the cooling oil from accumulating in the cooling groove and affecting the heat dissipation effect.

[0023] In some embodiments, the distance between two adjacent cooling grooves may be greater than or equal to 1 mm.

[0024] With such an arrangement, the distance between adjacent cooling slots is controlled within a reasonable range, so as to ensure that the circumferential outer side of the stator body has a uniform and good heat dissipation effect.

[0025] In a second aspect, the present application provides a motor, wherein the electrode includes the motor stator in the above technical solution.

[0026] In a third aspect, the present application provides an electric drive system, which includes the motor in the above technical solution.

[0027] In a fourth aspect, the present application provides a vehicle, which may include the electric drive system in the above technical solution.

[0028] The utility model provides a motor stator, a motor, an electric drive system and a vehicle, wherein the motor stator comprises a stator body and a plurality of cooling parts arranged on the circumferential outer side of the stator body; the cooling part comprises a cooling groove and a connecting port, the cooling groove is connected with the outer side of the stator body through the connecting port, the cross section of the cooling groove extends along the circumferential direction of the stator body, and the length of the cooling groove is greater than the width of the connecting port, so that the contact area between the cooling oil and the stator body when flowing through the stator can be increased, thereby improving the heat dissipation effect.

[0029] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the motor stator, motor, electric drive system and vehicle provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of the structure of a motor stator provided in an embodiment of the present application;

[0032] Figure 2 A top view of a motor stator provided in an embodiment of the present application;

[0033] Figure 3 A partial schematic diagram of a cooling portion on a motor stator provided in an embodiment of the present application;

[0034] Figure 4 A schematic diagram of a section of a cooling slot on a motor stator provided in an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 10-motor stator;

[0037] 100- stator body;

[0038] 200-cooling unit;

[0039] 210-cooling tank;

[0040] 211-first arc segment;

[0041] 212-second arc segment;

[0042] 213-third arc segment;

[0043] 220-Connection port. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0046] Secondly, it should be noted that in the description of the present application, terms such as "front", "rear", "left", "right", "up", "down", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0047] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0049] At present, the electric drive system of new energy vehicles is developing rapidly towards high power density, low cost, high integration and high efficiency. Under this trend, high power density requires high motor power and compact size. However, the internal heat of high power density motors is difficult to dissipate effectively, resulting in motor overheating, which in turn causes irreversible component damage and rotor demagnetization. Traditional water cooling methods can no longer meet the heat dissipation requirements. At present, oil cooling technology has gradually become the preferred solution for cooling new energy vehicle motors due to its excellent insulation properties. The cooling oil is sprayed onto the outside of the stator and the end of the winding through an oil spray pipe or an oil spray ring, and the heat on the stator is taken away by the flow of cooling oil. However, in the current heat dissipation method of the motor, the contact surface between the cooling oil and the stator is small, and the heat dissipation effect is poor.

[0050] In response to the above problems, the embodiments of the present application provide a motor stator, a motor, an electric drive system and a vehicle. By designing the outer heat dissipation structure of the motor stator, a cooling portion is arranged on the circumferential outer side of the stator body, thereby forming a cooling groove for cooling oil to flow on the outer side of the stator body. Without affecting the performance of the motor, the contact area between the cooling oil and the stator body when flowing through the stator can be increased. The cooling oil can take away more heat when flowing through the surface of the stator body, thereby improving the heat dissipation effect.

[0051] The technical solution of the present application will be described in detail below through specific embodiments.

[0052] Figure 1 A schematic diagram of the structure of a motor stator provided in an embodiment of the present application, Figure 2 A top view of a motor stator provided in an embodiment of the present application, Figure 3 A partial schematic diagram of the cooling portion on the motor stator provided in an embodiment of the present application.

[0053] like Figures 1 to 3 As shown, the embodiment of the present application provides a motor stator 10, which includes a stator body 100 and a plurality of cooling parts 200 arranged on the circumferential outer side of the stator body 100. The plurality of cooling parts 200 are arranged in sequence and spaced around the circumference of the stator body 100. When cooling oil enters the motor, the cooling oil can flow through the cooling parts 200 and take away the heat of the motor stator 10.

[0054] The cooling part 200 includes a cooling groove 210 and a connecting port 220. The cooling groove 210 is connected to the outside of the stator body 100 through the connecting port 220, and the cooling oil can flow in the cooling groove 210 along the extension direction of the cooling groove 210. The cooling oil can enter or flow out of the cooling groove 210 through the connecting port 220 on the outside of the stator body 100, ensuring that the groove wall of the cooling groove 210 can always be connected to the outside of the motor stator 10 through the connecting port 220 in the extension direction of the cooling groove 210.

[0055] In some embodiments, the cross-section of the cooling groove 210 extends along the circumference of the stator body 100, and the length of the cooling groove 210 is greater than the width of the connecting port 220. The cooling groove 210 can expand the contact area between the cooling oil and the stator body 100, so that the cooling oil can have a faster heat absorption efficiency with the stator body 100 when flowing through the cooling groove 210.

[0056] It is understandable that the stator body 100 may be a columnar structure, the outer contour of the radial cross section of the stator body 100 is circular, and the cooling groove 210 may be a heat dissipation groove that is recessed inwardly on the circumferential outer wall surface of the stator body 100. The embodiment of the present application does not limit the size value of the specific outline diameter of the stator body 100.

[0057] It should be noted that in the motor electronics provided in the embodiment of the present application, a cooling portion 200 is provided on the circumferential outer side of the stator body 100, thereby forming a cooling groove 210 for cooling oil to flow on the outer side of the stator body 100, so as to increase the contact area between the cooling oil and the stator body 100 when the cooling oil flows through the stator, thereby improving the heat dissipation effect.

[0058] The specific structure and dimension data of the cooling groove 210 are exemplarily described below.

[0059] Please continue to refer to Figures 1 to 3 In some embodiments, the cooling groove 210 may penetrate both ends of the stator body 100 along the radial direction of the stator body 100. When the cooling oil flows through the cooling groove 210, the cooling oil may flow from one end of the cooling groove 210 to the other end along the radial direction of the stator body 100.

[0060] It can be understood that the cooling groove 210 penetrates the stator body 100 in the axial direction of the stator body 100. At the same time, the cooling groove 210 is connected with the outer space of the stator body 100 in the radial direction of the stator body 100 through the connecting port 220. Therefore, the cooling oil can flow through the outer side of the stator body 100 along the radial direction of the stator body 100 without forming a closed circulation space. The cooling oil has better circulation freedom and can take away heat more efficiently.

[0061] In some embodiments, the cooling groove 210 is elliptical in shape. The major axis of the cooling groove 210 may be greater than or equal to 3 mm and less than or equal to 4 mm. This can prevent the cooling groove 210 from significantly changing the outer structure of the stator body 100 and prevent the function of the motor electronics from being affected.

[0062] Taking the diameter of the stator body 100 as 184 mm as an example, the number of cooling grooves 210 may be 112. The cooling grooves 210 have the same size and structure and are evenly distributed on the circumferential outer side of the stator body 100 .

[0063] Exemplarily, the extension direction of the long axis of the elliptical cooling groove 210 can be parallel to the direction of the tangent of the outer wall of the stator body 100 at the corresponding position of the cooling groove 210. The value of the long axis size of the cooling groove 210 is L. The specific value of L can include but is not limited to 3mm, 3.1mm, 3.2mm, 3.5mm, 3.7mm, 3.8mm, 3.9mm, 4mm, etc., and the embodiment of the present application does not make specific limitations on this.

[0064] It should be noted that the specific size of the cooling groove 210 and the number of the cooling groove 210 arranged on the circumferential side of the stator body 100 can be set according to the specific size of the stator body 100, and the embodiment of the present application does not make any specific limitation on this.

[0065] In some embodiments, the distance between the side wall of the cooling groove 210 away from the communication port 220 and the outer wall of the stator body 100 may be greater than or equal to 1.5 mm and less than or equal to 2.5 mm.

[0066] It can be understood that the cooling groove 210 is connected to the outer wall of the stator body 100 through the connecting port 220, and the distance between the side wall of the cooling groove 210 away from the connecting port 220 and the outer wall of the stator body 100 can be approximately equal to the sum of the length of the connecting port 220 in the radial direction of the stator body 100 and the size of the minor axis of the cooling groove 210. By controlling the distance between the side wall of the cooling groove 210 away from the connecting port 220 and the outer wall of the stator body 100 within a reasonable range, the cooling groove 210 can have a sufficient flow cross section while avoiding the cooling groove 210 from being too deep in the radial direction of the stator body 100 to affect the motor performance.

[0067] Illustratively, the distance between the side wall of the cooling groove 210 away from the connecting port 220 and the outer wall of the stator body 100 is D, and the specific value of D may include but is not limited to 1.5 mm, 1.6 mm, 1.7 mm, 2 mm, 2.3 mm, 2.4 mm, 2.5 mm, etc., and the embodiment of the present application does not make any specific limitation on this.

[0068] Figure 4A schematic diagram of a section of a cooling slot on a motor stator provided in an embodiment of the present application.

[0069] Please refer to Figure 4 , and combined with Figure 1 and Figure 2 In some embodiments, the groove wall of the cooling groove 210 may include a first arc segment 211, a second arc segment 212 and a third arc segment 213, the first arc segment 211 is connected to the side wall of the connecting port 220, the second arc segment 212 is connected to the first arc segment 211, and the third arc segment 213 is connected to the second arc segment 212.

[0070] It can be understood that the first arc segment 211, the second arc segment 212 and the third arc segment 213 are arranged to form the cooling groove 210. The first arc segment 211, the second arc segment 212 and the third arc segment 213 are connected in sequence, and the gap between the head and the tail of the arc surface formed by the first arc segment 211, the second arc segment 212 and the third arc segment 213 corresponds to the connecting port.

[0071] For example, there can be a smooth transition between the first arc segment 211 and the second arc segment 212. There can be a smooth transition between the second arc segment 212 and the third arc segment 213. Such an arrangement can improve the smoothness of the cooling oil flowing through the cooling groove 210.

[0072] In some embodiments, the third arc segment 213 is arranged opposite to the connecting port 220, and the third arc segment 213 is symmetrical with respect to the central axis of the connecting port 220, so that when the cooling groove 210 is processed and formed on the stator body 100, it is convenient to locate the position of the cooling groove 210, thereby improving the processing convenience of the cooling groove 210.

[0073] There are two first arc segments 211 and two second arc segments 212, and the two second arc segments 212 are connected to both sides of the third arc segment 213. The two first arc segments 211 are respectively connected to one end of the two second arc segments 212 away from the third arc segment 213, and one end of the two first arc segments 211 away from the second arc segment 212 is respectively connected to the side walls of both sides of the communication port 220.

[0074] It can be understood that the two first arc segments 211 are symmetrically arranged relative to the central axis of the communication port 220, and the two second arc segments 212 are symmetrically arranged relative to the central axis of the communication port 220. Exemplarily, when the cross-sectional shape of the cooling groove 210 is an ellipse, the two second arc segments 212 respectively constitute the side walls at both ends of the long axis of the cooling groove 210.

[0075] It should be noted that, in the embodiment of the present application, the arc radius of the first arc segment 211 and the third arc segment 213 is greater than the arc radius of the second arc segment 212. Thus, the extension distance of the first arc segment 211 and the third arc segment 213 can be increased along the circumferential direction of the stator body 100, thereby expanding the flow cross section of the cooling groove 210, increasing the flow speed of the cooling oil in the cooling groove 210, and improving the cooling and heat dissipation effect.

[0076] In some embodiments, the radial length of the communication port 220 along the stator body 100 may be greater than or equal to 0.5 mm, thereby ensuring that the corners of the communication port 220 have sufficient structural strength on the outside of the stator body 100 to avoid deformation or damage during installation or transportation.

[0077] Illustratively, the radial length dimension of the connecting port 220 along the stator body 100 may be d, and the specific value of d may include but is not limited to 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, etc., which is not specifically limited in the embodiments of the present application.

[0078] In some embodiments, the width of the communication port 220 may be greater than or equal to 1 mm. In this way, the cooling oil has the freedom to flow into and out of the cooling groove 210 in the radial direction of the stator body 100, thereby preventing the cooling oil from accumulating in the cooling groove 210 and affecting the heat dissipation effect.

[0079] It is understandable that the function of the connecting port 220 is to connect the cooling groove 210 with the outer side of the stator body 100 in the radial direction of the stator body 100 , and the width dimension of the connecting port 220 only needs to not exceed the major axis dimension of the cooling groove 210 .

[0080] Exemplarily, the width dimension of the connecting port 220 is W, and the specific value of W may include but is not limited to 1mm, 1.1mm, 1.5mm, 2mm, 2.5mm, 2.9mm, 3mm, etc. The embodiment of the present application does not limit the specific width dimension value of the connecting port 220.

[0081] In some embodiments, the distance between two adjacent cooling slots 210 may be greater than or equal to 1 mm, so that the distance between adjacent cooling slots 210 is controlled within a reasonable range to ensure that the circumferential outer side of the stator body 100 has a uniform and good heat dissipation effect.

[0082] Exemplarily, the distance between two adjacent cooling grooves 210 is N, and the specific value of N may include but is not limited to 1mm, 1.1mm, 1.2mm, 1.5mm, 2mm, 2.1mm, 2.5mm, 3mm, etc. The embodiment of the present application does not limit the specific numerical value of the distance between two adjacent cooling grooves 210.

[0083] It should be noted that each cooling groove 210 may be provided with a corresponding communication port 220, and the plurality of cooling grooves 210 are evenly spaced and distributed in the circumferential direction of the stator body 100, that is, the distance between two adjacent cooling grooves 210 is kept equal. The distance between two adjacent cooling grooves 210 can be set according to the diameter of the stator body 100 and the number of cooling grooves 210.

[0084] The embodiment of the present application provides a motor stator 10, which includes a stator body 100 and a plurality of cooling parts 200 arranged on the circumferential outer side of the stator body 100; the cooling part 200 includes a cooling groove 210 and a connecting port 220, the cooling groove 210 is connected to the outer side of the stator body 100 through the connecting port 220, the cross-section of the cooling groove 210 extends along the circumference of the stator body 100, and the length of the cooling groove 210 is greater than the width of the connecting port 220, so that the contact area between the cooling oil and the stator body 100 when flowing through the stator can be increased, thereby improving the heat dissipation effect.

[0085] The embodiment of the present application provides a motor, which includes the motor stator 10 in the above technical solution. The motor provided by the present application also includes a motor housing, a motor rotor and a winding. The motor stator 10, the motor rotor and the winding can be arranged in the motor housing, and the winding can be wound on the motor stator 10.

[0086] The motor provided in the embodiment of the present application has all the technical solutions and all the technical effects of the aforementioned motor stator 10, which will not be repeated here.

[0087] The embodiment of the present application also provides an electric drive system, which includes the motor in the above technical solution. The motor can be integrated in the electric drive system, and the electric drive system can also include a housing, a reducer, a controller, and a cooling structure. The output shaft of the motor is connected to the reducer, and the rotation of the motor is output through the reducer. The controller can be used to control the operation of the motor and transmit control signals to the outside.

[0088] It should be noted that the electric drive system provided in the embodiment of the present application has all the technical solutions and all the technical effects of the aforementioned motor stator 10, which will not be described in detail here. The electric drive system can have multiple control functions in one, including but not limited to vehicle control, motor control, high and low voltage conversion, battery management, etc., which are not specifically limited in the embodiment of the present application.

[0089] The embodiment of the present application also provides a vehicle, which may include the electric drive system in the above technical solution. The vehicle provided in the embodiment of the present application may be a new energy vehicle, including but not limited to a pure electric vehicle, a hybrid electric vehicle, a hydrogen energy vehicle, etc., which is not specifically limited in the embodiment of the present application.

[0090] The automobile provided in the embodiment of the present application has all the technical solutions and all the technical effects of the aforementioned motor stator 10, which will not be repeated here.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A motor stator, characterized in that: The invention comprises a stator body and a plurality of cooling parts arranged on the outer side of the stator body in the circumferential direction; the cooling parts comprise cooling grooves and communication ports, and the cooling grooves are communicated with the outer side of the stator body through the communication ports; A cross section of the cooling groove extends along the circumferential direction of the stator body, and a length of the cooling groove is greater than a width of the communication port.

2. The motor stator according to claim 1, characterized in that: The cooling groove penetrates both ends of the stator body along a radial direction of the stator body.

3. The motor stator according to claim 1, characterized in that: The cooling groove is elliptical; the major axis size of the cooling groove is greater than or equal to 3 mm and less than or equal to 4 mm.

4. The motor stator according to claim 1, characterized in that: The distance between the side wall of the cooling groove away from the communication port and the outer wall of the stator body is greater than or equal to 1.5 mm and less than or equal to 2.5 mm.

5. The motor stator according to any one of claims 1 to 4, characterized in that: The groove wall of the cooling groove includes a first arc segment, a second arc segment and a third arc segment, the first arc segment is connected to the side wall of the connecting port, the second arc segment is connected to the first arc segment, and the third arc segment is connected to the second arc segment.

6. The motor stator according to claim 5, characterized in that: The third arc segment is arranged opposite to the communication opening, and the third arc segment is symmetrical with respect to the central axis of the communication opening.

7. The motor stator according to claim 5, characterized in that: The arc radius of the first arc segment and the third arc segment is greater than the arc radius of the second arc segment.

8. The motor stator according to claim 5, characterized in that: There are two first arc segments and two second arc segments, and the two second arc segments are connected to both sides of the third arc segment; the two first arc segments are respectively connected to one end of the two second arc segments facing away from the third arc segment, and the ends of the two first arc segments away from the second arc segment are respectively connected to the side walls on both sides of the connecting port.

9. The motor stator according to any one of claims 1 to 4, characterized in that: A length dimension of the communication port along a radial direction of the stator body is greater than or equal to 0.5 mm.

10. The motor stator according to any one of claims 1 to 4, characterized in that: The width of the communication port is greater than or equal to 1 mm.

11. The motor stator according to any one of claims 1 to 4, characterized in that: The distance between two adjacent cooling grooves is greater than or equal to 1 mm.

12. A motor, characterized in that: The motor stator comprises the motor stator as described in any one of claims 1-11.

13. An electric drive system, characterized in that: Including the motor as claimed in claim 12.

14. A vehicle, characterized in that: Includes the electric drive system as described in claim 13.

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