Cooling ring of motor, motor, power assembly and vehicle

Abstract

The invention relates to a cooling ring of a motor, the motor, a power assembly and a vehicle, the cooling ring of the motor comprises a body, the body comprises an inner ring and an outer ring, the inner ring is used for sleeving a rotor of the motor, and a cooling space is formed between the inner ring and the outer ring. The cooling space is used for accommodating at least part of coil windings of a stator of the motor; and the shielding part is arranged in the inner ring, and the shielding part comprises a conductive material and can be grounded. The shielding part can reduce the stray capacitance between the coil winding and the rotor, the voltage between the coil winding and the rotor can be increased by reducing the stray capacitance, and the shaft voltage is reduced when the voltage is increased, so that the shaft voltage is prevented from being generated. The shielding part can lead the common-mode voltage to the ground through grounding, so that a voltage discharge path is prevented from being formed between the shielding part and the rotor to contribute to the shaft voltage. Other installation structures do not need to be additionally arranged, and the complexity of the motor structure, the process difficulty of disassembly and assembly and the like are not affected.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motors, and in particular, to a cooling ring of a motor, a motor, a powertrain, and a vehicle. Background Art

[0002] The occasional asymmetry of the magnetic field during the motor manufacturing process, the influence of the inherent magnetic field imbalance of the motor, the application of PWM frequency conversion technology and the accumulation of electrostatic charges will generate common-mode voltage in the coil winding, and then generate shaft voltage when the motor is working. The shaft voltage can easily break through the bearing and generate shaft current, which will cause harm to the motor. For example, electric sparks break through the lubricating oil film; electrical corrosion of the bearing, forming grooves on the inner ring, outer ring or ball of the bearing; increasing the vibration and noise of the motor, etc., greatly shortening the service life of the motor. The problem of shaft current not only affects the NVH performance, but also poses challenges to the reliability of the entire electric drive system. In related technologies, the problem is usually solved by guiding or blocking the shaft current, but they all have the disadvantages of increasing the cost of the motor, complex motor structure and complex disassembly and assembly procedures, and cannot fundamentally solve the problem of shaft current corrosion. Summary of the invention

[0003] An object of the present disclosure is to provide a cooling ring of a motor, a motor, a powertrain, and a vehicle, so as to at least partially solve the problems existing in the related art.

[0004] In order to achieve the above-mentioned objectives, the present disclosure provides a cooling ring for a motor, comprising: a main body, the main body comprising an inner ring and an outer ring, the inner ring being used to sleeve the rotor of the motor, a cooling space being formed between the inner ring and the outer ring, the cooling space being used to accommodate at least part of the coil winding of the stator of the motor; and a shielding portion, arranged on the inner ring, the shielding portion comprising a conductive material and capable of being grounded.

[0005] Optionally, the shield comprises a metal layer embedded in the inner ring.

[0006] Optionally, the metal layer is configured in a sleeve shape.

[0007] Optionally, the body is used to be arranged at the axial end of the stator, and the body also includes an annular plate, which is sealed to the same end of the inner ring and the outer ring, wherein the inner ring, the outer ring and the annular plate enclose a receiving groove for partially accommodating the coil winding.

[0008] Optionally, the outer ring is provided with an oil inlet and an oil outlet for the flow of cooling oil.

[0009] Optionally, the cross-section of the oil inlet is larger than the cross-section of the oil outlet.

[0010] Optionally, an opening side of the accommodating groove is sealed and connected to the stator.

[0011] Optionally, the stator includes an iron core, the coil winding includes a main body portion wound around the iron core and a protruding portion protruding from an axial end of the iron core, and the shielding portion at least covers the protruding portion.

[0012] Optionally, the shielding portion is configured to extend from an opening side of the accommodating groove to the annular plate.

[0013] Optionally, the body is made of insulating material.

[0014] According to a second aspect of the present disclosure, a motor is provided, comprising a housing, a rotor, a stator and a cooling ring of the motor.

[0015] Optionally, the number of cooling rings of the motor is two, and the two cooling rings of the motor are respectively installed on two axial ends of the stator.

[0016] Optionally, the rotor is rotatably mounted to the housing via a bearing.

[0017] Optionally, the shielding portion is electrically connected to an iron core of the stator, and the iron core is grounded.

[0018] Optionally, the iron core is conductively mounted on an inner wall of the shell, and the shell is grounded.

[0019] Optionally, the cooling ring of the motor is a motor end cover.

[0020] According to a third aspect of the present disclosure, there is provided a power assembly comprising the above-mentioned motor.

[0021] According to a fourth aspect of the present disclosure, a vehicle is provided, comprising the above-mentioned powertrain.

[0022] Through the above technical solution, when the motor generates a common-mode voltage at the neutral point of the coil winding, the shielding part 200 with conductive properties can drain the common-mode current, which can reduce the stray capacitance between the coil winding and the rotor, thereby reducing the amplitude of the shaft voltage caused by the common-mode voltage, thereby effectively avoiding the generation of shaft voltage and causing damage to the bearings of the motor, etc., and improving the service life of the motor. At the same time, the shielding part can lead the current to the ground by grounding, avoiding the formation of a voltage discharge path between the shielding part and the rotor and contributing to the shaft voltage. The technical solution disclosed in the present invention can fundamentally solve the shaft voltage generated by the coil winding, and the shielding part is installed on the inner ring of the cooling ring of the motor, and no other additional installation structure is required, which has no effect on the complexity of the motor structure and the difficulty of disassembly and assembly.

[0023] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic diagram of a cooling ring of a motor exemplarily shown according to the present disclosure; Figure 2 is a schematic diagram of a motor exemplarily shown according to the present disclosure; Figure 3 yes Figure 2 A cross-sectional view of the motor shown in FIG. Figure 4 yes Figure 3 A partial enlarged view of the position of the cooling ring close to the motor; Figure 5 1 is an equivalent circuit diagram of a motor taking stray capacitance into consideration according to an exemplary embodiment of the present disclosure.

[0025] Description of Reference Numerals 1-rotor; 2-stator; 21-coil winding; 211-main part; 212-extending part; 22-iron core; 100-body; 110-inner ring; 120-outer ring; 121-oil inlet; 122-oil outlet; 130-annular plate; 140-accommodating groove; 200-shielding part; 201-metal layer. DETAILED DESCRIPTION

[0026] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0027] In the present disclosure, unless otherwise stated, the directional words used, such as "inside" and "outside", can be based on the usage status of the relevant components, for example: including an "inner" ring and an "outer" ring, where "inside and outside" are relative, that is, the "inner ring" is arranged on the inner side of the "outer ring" and the "outer ring" is located on the outer side of the "inner ring".

[0028] In the present disclosure, the terms "first", "second", etc. are used to distinguish one element from another element, and do not have order and importance. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] In order to make it easier to understand this solution, here is a brief introduction to the design background. In the relevant technology, the motor usually includes a rotor, a stator and a housing. The rotor is rotatably mounted on the housing through a bearing, and the stator is sleeved on the outer periphery of the rotor and installed on the inner wall of the housing. The stator includes an iron core and a coil winding wound around the iron core. The rotor can be a permanent magnet rotor or an electrically excited rotor. The rotor specifically includes a rotating shaft, a permanent magnet or a rotor excitation winding. The iron core is fixedly arranged on the inner surface of the housing and connected to the ground, and the coil winding is fixedly installed in the winding groove of the iron core. The rotating shaft frame is connected to the inside of the stator and is connected to the housing by a bearing frame, that is, the rotating shaft is connected to the housing at the front and back through bearings, so that the rotor can rotate under the action of electromagnetic force. When the motor is working, the coil winding will generate a common mode voltage due to occasional asymmetry of the magnetic field caused by the production and manufacturing process of the motor, the influence of the inherent magnetic field imbalance of the motor, the application of PWM frequency conversion technology and the accumulation of electrostatic charge. Reference Figure 5 , the common mode voltage V com There are usually two pressure relief paths, one of which is coupled to the iron core and grounded through the iron core and the housing. The other is coupled to the rotor and grounded to the housing via the rotor shaft and bearing. The voltage acting on the bearing is the shaft voltage. When the voltage reaches a certain value, it can form a shaft current that breaks through the bearing, generate electric sparks to break through the lubricating oil film, cause electrical corrosion in the bearing, form grooves on the inner ring, outer ring or ball of the bearing, increase the vibration and noise of the motor, etc., greatly shortening the service life of the motor. Figure 5 In the figure, w represents the coil winding, f represents the stator core, r represents the rotor (rotating shaft), C wf connected in parallel in the circuit, so its voltage is the same as the common-mode voltage, C wr and C rf are in series, their sum is the common mode voltage, C wf is the stray capacitance between the coil winding and the core, and its corresponding voltage is equal to the common mode voltage V com ; C wr is the stray capacitance between the coil winding and the rotor shaft, C rf is the stray capacitance between the rotor shaft and the housing, C b is the equivalent capacitance of the bearing. b With C rf The voltage at the points is equal in parallel, and the two are connected with C wr The sum of the voltages in series at the points is equal to the common-mode voltage V com , that is, increase C wr The voltage at C b The voltage can be adjusted by adjusting the capacitance value. According to the electrical principle, when the charge is constant, the voltage is inversely proportional to the capacitance.

[0030] After understanding the basic background of the present disclosure, the technical solution of the present disclosure will be specifically introduced below, specifically: Reference Figure 1-Figure 5 The present disclosure exemplarily shows a cooling ring of a motor, including a body 100 and a shielding part 200. The body 100 includes an inner ring 110 and an outer ring 120. The inner ring 110 is used to sleeve the rotor 1 of the motor. A cooling space is formed between the inner ring 110 and the outer ring 120. The cooling space is used to accommodate at least part of the coil winding 21 of the stator 2 of the motor so as to cool the at least part of the coil winding 21. The present disclosure does not limit the specific cooling method, for example, it can be liquid cooling, air cooling, etc. The shielding part 200 is arranged on the inner ring 110, and the shielding part 200 includes a conductive material and can be grounded.

[0031] The present disclosure does not limit the specific structure, size and installation position of the shielding part 200, which can be installed on the inner wall of the inner ring 110. Alternatively, it can be installed on the outer wall of the inner ring 110. Alternatively, it can be embedded in the inner ring 110. The shielding part 200 can include copper material, aluminum material, conductive plastic, conductive rubber, etc., as long as it can conduct electricity and be used for grounding. The specific structure and installation method will be described in detail below.

[0032] The inner ring 110 and the outer ring 120 of the body 100 may be formed as a whole by the annular plate 130 mentioned below. Alternatively, a connecting rib or the like may be provided between the inner ring 110 and the outer ring 120. The shielding portion 200 is provided on the inner ring 110 so as to be located between the coil winding 21 and the rotor 1, specifically between the coil winding 21 and the rotating shaft of the rotor 1, thereby providing a "shielding" effect on the coil winding 21, so as to guide the voltage coupling of the coil winding 21 to the ground, and prevent the voltage of the coil winding 21 from being coupled to the rotating shaft.

[0033] The present disclosure does not limit how the shielding part 200 is grounded. For example, it can be connected to the iron core 22 of the stator 2 through a wire, or it can also be connected to the housing of the motor through a wire to achieve indirect grounding. Alternatively, it can also be directly connected to the iron core 22 of the stator. The present disclosure does not limit this, and it can be designed according to the specific structural adaptability.

[0034] It should be explained that stray capacitance is also called parasitic capacitance, which is the capacitance between electronic components or circuit modules in the circuit due to their own structural parameters and other reasons. Most of them are unavoidable stray capacitance. Through this stray capacitance, voltage coupling can be formed between two electronic components or circuit modules, that is, a potential difference is formed.

[0035] By using the above technical solution, when the motor is working and the coil winding 21 generates a common mode voltage, the shielding part 200 with conductive characteristics can drain the common mode current, which can reduce the stray capacitance between the coil winding 21 and the rotor 1, thereby reducing the amplitude of the shaft voltage caused by the common mode voltage, thereby effectively avoiding the generation of shaft voltage and causing damage to the bearings of the motor, etc., and improving the service life of the motor. At the same time, the shielding part 200 can lead the current to the ground by grounding, avoiding the formation of a voltage discharge path between the shielding part 200 and the rotor 1 and contributing to the shaft voltage. The technical solution disclosed in the present invention can fundamentally solve the shaft voltage generated by the coil winding, and the shielding part 200 is installed on the inner ring 110 of the cooling ring of the motor, and there is no need to set up other additional installation structures, which has no effect on the complexity of the motor structure and the difficulty of disassembly and assembly process.

[0036] Specifically, refer to Figure 5 The present disclosure introduces a new transmission path by setting a grounded shielding part 200, so that the voltage received by the rotor 1 is reduced, thereby reducing C b The voltage at both ends is used to reduce the voltage divided by the shaft. On the one hand, the bearing voltage is reduced, the speed of electrical corrosion of the bearing is slowed down, and the damage to the bearing is avoided to a great extent. On the other hand, the voltage increase caused by the rotor, shaft and transmission, including the grounding of the load system, is reduced, the speed of electrical corrosion is slowed down, and the service life of the motor is extended. It should be noted that in the present disclosure, the stray capacitance between the coil winding 21 and the rotor 1 refers to the stray capacitance between the coil winding 21 and the shaft of the rotor 1, and the shaft voltage coupled to the rotor 1 refers to the shaft voltage coupled to the shaft of the rotor 1. This point will not be explained below.

[0037] Reference Figure 3 and Figure 4 In the embodiment of the present disclosure, the shielding part 200 may include a metal layer 201 embedded in the inner ring 110. Specifically, the metal layer 201 may be made of copper material, aluminum material, etc., and may be integrally formed with the inner ring 110 when the inner ring 110 is manufactured and buried inside the inner ring 110. By providing the metal layer 201, it may form a capacitor structure with the coil winding 21, and the coil winding 21 may couple its common mode voltage to the metal layer 201 and further guide it to the ground, so as to prevent the coil winding 21 from discharging pressure toward the rotor 1 to contribute to the shaft voltage.

[0038] The present disclosure does not limit the shape of the metal layer 201. In some embodiments, the metal layer 201 can be constructed in a sleeve shape. With such a design, since the rotor 1 and the winding coil 21 are both arc surface structures, the metal layer 201 can be arranged between the coil winding 21 and the rotor 1 at any position along the circumferential direction, thereby enhancing the "shielding" effect of the metal layer 201 on the stray capacitance between the coil winding 21 and the rotor 1, thereby reducing the shaft voltage coupled to the rotor 1. In addition, in some other embodiments, the metal layer 201 can also be a non-closed arc surface structure, in which case, the number thereof can be multiple.

[0039] Reference Figure 1-Figure 3 In the embodiment of the present disclosure, the body 100 can be used to be arranged at the axial end of the stator 2, and the body 100 can also include an annular plate 130, which is sealed at the same end of the inner ring 110 and the outer ring 120. Among them, the inner ring 110, the outer ring 120 and the annular plate 130 can enclose to form a receiving groove 140 for partially accommodating the coil winding 21. By accommodating at least part of the end of the coil winding 21 in the receiving groove 140, on the one hand, the coil winding 21 can be protected, and on the other hand, it is convenient to fill the receiving groove 140 with cooling oil to immerse the end of the coil winding 21. The immersion cooling method can greatly improve the continuous power, which is more suitable for the long-term operation of the drive motor, and also improves the duration of the peak power of the motor, greatly enhancing the durability of the motor. In addition, by setting the shielding part 200 on the inner ring 110 of the main body 100, the cooling ring of the motor can simultaneously achieve the effects of immersion cooling and suppression of shaft voltage without adding additional mounting structures, causing no complexity in the motor structure, and without complicating the motor disassembly and assembly process.

[0040] Further, refer to Figure 1 In the embodiment of the present disclosure, the outer ring 120 may be provided with an oil inlet 121 and an oil outlet 122 for the flow of cooling oil. When in use, the cooling oil in the receiving groove 140 can circulate through the oil inlet 121 and the oil outlet 122 to ensure that the temperature of the cooling oil in the receiving groove 140 is always at a low temperature to ensure the cooling effect. The present disclosure does not limit the number of the oil outlet 122 and the oil inlet 121. For example, they can be one each, or they can be two. Figure 1 As shown in FIG. 1 , the number of the oil outlets 122 is two, and the number of the oil inlet 121 is one.

[0041] In the embodiment of the present disclosure, the cross-section of the oil inlet 121 can be larger than the cross-section of the oil outlet 122. Such a design can ensure that the receiving tank 140 is always filled with cooling oil, ensuring the effect of immersion cooling. It should be noted that the cross-section area here refers to the sum of the areas of all the oil outlets 122 or all the oil inlets 121.

[0042] Reference Figure 4 In the embodiment of the present disclosure, the open side of the receiving groove 140 can be sealed and connected to the stator 2, specifically, the outer ring 120 can be sealed and connected to the iron core 22, and the inner ring 110 can be sealed and connected to the coil winding 21. Such a design can prevent the cooling oil in the receiving groove 140 from leaking to the rotor 1 and affecting the efficiency and life of the motor. It should be noted that the open side of the receiving groove 140 is "filled" with the coil winding 21 and insulating paper, etc., so that the cooling oil cannot flow out through the open side, and even if there is a small amount of leakage, the leakage amount is very small and can be ignored. In the embodiment of the present disclosure, the main body 100 can be fixed to the stator 2 by means of adhesive, snaps, bolts, etc., and further sealed by sealant, etc.

[0043] Preferably, in some embodiments, the stator 2 includes an iron core 22, and the coil winding 21 may include a main body 211 wound around the iron core 22 and an extended portion 212 extending from the axial end of the iron core 22, and the shielding portion 200 may at least cover the extended portion 212. According to experimental simulation, the extended portion 212 of the winding coil 21 contributes greatly to the shaft voltage, and covering at least the extended portion 212 with the shielding portion 200 can achieve a better "shielding" effect, effectively reducing the shaft voltage of the coil winding 21 coupled to the rotor 1. Here, it should be explained that the coverage here means that the projection of the extended portion 212 falls within the projection range of the shielding portion 200 on any radial projection. In other words, any position of the extended portion 212 is shielded by the shielding portion 200 inward in the radial direction so that it cannot directly face the rotor 1.

[0044] In the embodiment of the present disclosure, in order to improve the shielding effect of the shielding part 200, refer to Figure 4 , the shielding portion 200 may be configured to extend from the opening side of the receiving groove 140 to the annular plate 130, that is, the shielding portion 200 covers the entire inner ring 110, thereby ensuring that it is completely "shielded" between the rotor 1 and the portion of the coil winding 21 located in the receiving groove 140. In addition, in some other embodiments, the shielding portion 200 may also cover the annular plate 130.

[0045] In the related art, the immersed shell is mainly made of metal material, and its structure cannot be completely sealed (cooling oil is easy to leak from the stator into the rotor, resulting in increased mechanical loss), and this cooling structure is easy to cause the electrical creepage distance between the coil windings 21 to fail to pass the high-voltage safety verification as the voltage platform increases. The shell of the metal structure is also in the alternating magnetic field of the motor, causing the metal shell to generate eddy currents. The eddy current loss causes the shell to heat up, which is easy to cause cooling failure, thereby affecting the stability of the motor. In the embodiment of the present disclosure, the body 100 can be made of insulating material. Specifically, it can include high-temperature resistant and insulating materials such as epoxy resin, such as rubber, plastic, etc. Designed in this way, it avoids the creepage requirements brought by metal materials and reduces the eddy current loss of the metal shell, minimizes the temperature of the motor, and thus improves the continuous power and stability. In addition, the metal layer 201 is embedded in the insulating material, which can prevent the metal layer 201 from being broken down due to the small distance between the coil winding 21. And compared with the metal shell, the eddy current generated by the metal layer 201 is smaller, and the current can be quickly introduced into the ground.

[0046] In this case, since the metal layer 201 is wrapped by insulating material, when grounding it, it is necessary to open a hole in the inner ring 110 to allow at least part of the metal layer 201 to leak out and complete the electrical connection with the conductor or the iron core 22, etc.

[0047] According to a second aspect of the present disclosure, a motor is provided, comprising a housing, a rotor 1, a stator 2 and a cooling ring of the motor described above. Since the motor has all the beneficial effects of the cooling ring of the motor described above, they are not described in detail here.

[0048] The present disclosure does not limit the type of motor, which may be a permanent magnet synchronous motor, an electrically excited synchronous motor, an asynchronous motor, a DC motor, etc.

[0049] Reference Figure 2 and Figure 3 In the embodiment of the present disclosure, the number of cooling rings of the motor can be two, and the cooling rings of the two motors are respectively installed on the two axial ends of the stator 2, so as to be able to "shield" the protruding parts of the two axial ends of the coil winding 21 respectively to prevent them from contributing shaft voltage toward the rotor 1.

[0050] In the embodiment of the present disclosure, the rotor 1 can be rotatably mounted on the housing via a bearing (not shown in the figure). After the shaft voltage is reduced by the shielding part 200, the bearing can be protected to increase its service life and stability.

[0051] In the embodiment of the present disclosure, the shielding part 200 can be electrically connected to the iron core 22 of the stator 2, and the iron core 22 is grounded. With such a design, the shielding part 200 can be indirectly grounded through the iron core 22, simplifying the motor circuit. The shielding part 200 can be directly in contact with the iron core 22 for electrical conduction, or it can also be achieved through a wire.

[0052] In the embodiment of the present disclosure, the iron core 22 can be conductively mounted on the inner wall of the housing, and the housing is grounded. With such a design, the iron core 22 can be indirectly grounded through the housing, further simplifying the internal circuit of the motor.

[0053] In the embodiment of the present disclosure, the cooling ring of the motor can be a motor end cover. With such a design, the cooling function and the shielding function are integrated into the motor end cover, which can make the motor end cover more functional, and there is no need to separately set up an annular structure located inside the motor end cover, thereby simplifying the motor structure, improving the integration, and reducing the difficulty of the assembly process.

[0054] According to a third aspect of the present disclosure, a power assembly is provided, comprising the above-mentioned motor. Since the power assembly has all the beneficial effects of the above-mentioned motor, they will not be described in detail here.

[0055] According to a fourth aspect of the present disclosure, a vehicle is provided, comprising the above-mentioned power assembly. Since the vehicle has all the beneficial effects of the above-mentioned power assembly, they will not be described in detail here.

[0056] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0057] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0058] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A cooling ring for a motor, characterized in that: include: A body, the body comprising an inner ring and an outer ring, the inner ring being used to sleeve the rotor of the motor, a cooling space being formed between the inner ring and the outer ring, the cooling space being used to accommodate at least part of the coil winding of the stator of the motor; The shielding part is arranged on the inner ring, and the shielding part comprises a conductive material and can be grounded.

2. The cooling ring of the motor according to claim 1, characterized in that: The shield includes a metal layer embedded in the inner ring.

3. The cooling ring of the motor according to claim 2, characterized in that: The metal layer is configured in the shape of a sleeve.

4. The cooling ring of the motor according to claim 1, characterized in that: The body is used to be arranged at the axial end of the stator, and the body also includes an annular plate, and the annular plate is sealed to the same end of the inner ring and the outer ring. The inner ring, the outer ring and the annular plate are enclosed to form a receiving groove for receiving at least a part of the coil winding.

5. The cooling ring of the motor according to claim 4, characterized in that: The outer ring is provided with an oil inlet and an oil outlet for the cooling oil to flow.

6. The cooling ring of the motor according to claim 5, characterized in that: The cross-section of the oil inlet is larger than the cross-section of the oil outlet.

7. The cooling ring of the motor according to claim 5, characterized in that: The opening side of the accommodating groove is sealed and connected to the stator.

8. The cooling ring of the motor according to claim 4, characterized in that: The stator includes an iron core, the coil winding includes a main body portion wound around the iron core and a protruding portion protruding from an axial end of the iron core, and the shielding portion at least covers the protruding portion.

9. The cooling ring of the motor according to claim 4, characterized in that: The shielding portion is configured to extend from an opening side of the accommodating groove to the annular plate.

10. The cooling ring of the motor according to any one of claims 1 to 9, characterized in that: The body is made of insulating material.

11. A motor, characterized in that: A cooling ring of the motor comprising a housing, a rotor, a stator and any one of claims 1-10.

12. The motor according to claim 11, characterized in that The number of the cooling rings of the motor is two, and the two cooling rings of the motor are respectively installed on the two shaft ends of the stator.

13. The motor according to claim 11, characterized in that The rotor is rotatably mounted on the housing via a bearing.

14. The motor according to claim 11, characterized in that The shielding portion is electrically connected to an iron core of the stator, and the iron core is grounded.

15. The motor according to claim 14, characterized in that The iron core is conductively mounted on the inner wall of the shell, and the shell is grounded.

16. The motor according to claim 11, characterized in that The cooling ring of the motor is a motor end cover.

17. A powertrain, characterized in that: A motor comprising any one of claims 11-16.

18. A vehicle, characterized in that: Includes the powertrain as described in claim 17.

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