Stator, motor, driving assembly and vehicle

Abstract

The utility model discloses a stator, a motor, a driving assembly and a vehicle. According to the utility model, the stator comprises a stator iron core, the stator iron core comprises a cooling liquid channel, and the cooling liquid channel is arranged on the surface and / or in the stator iron core and is used for circulation of cooling liquid; at least part of the inner wall of the cooling liquid channel comprises an isolation coating which is used for isolating the cooling liquid and the stator core. By adopting the scheme of the utility model, the leakage problem of motor cooling liquid can be effectively improved, the reliability and stability of the motor are ensured, the service life of the motor is prolonged, and potential safety hazards are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a kind of stator, motor, drive assembly and vehicle. BACKGROUND

[0002] Electric commercial vehicle has become an important part of new energy vehicle field, and the reliability and stability of its equipment are of great significance to the operation and use of vehicle. With the development of automobile industry, motor heat dissipation plays a crucial role in vehicle operation. The more commonly used motor cooling system at present is to use cooling liquid to cool the stator, but the existing motor cooling system has the problem of cooling liquid leakage during operation. Stator cooling liquid leakage may cause the performance of motor to decline, temperature to rise, and even seriously damage the motor. Further, it affects the performance and service life of the motor, and increases the maintenance cost. SUMMARY

[0003] Based on the defects of the prior art, the utility model provides a kind of stator, motor, drive assembly and vehicle to reduce cooling liquid leakage and improve the reliability and stability of motor operation.

[0004] In the first aspect, the utility model provides a kind of stator, including stator core, stator core includes cooling liquid passage, cooling liquid passage is arranged on the surface and / or inside of stator core, for cooling liquid to flow through;

[0005] At least part of the inner wall of the cooling liquid passage includes an isolation coating, which is used to separate the cooling liquid and the stator core.

[0006] Optionally, the stator further includes a stator winding, and the stator winding is wound in a stator slot on the inner side of the stator core.

[0007] The cooling liquid passage is located on the surface of the side of the stator core away from the stator winding, and the isolation coating is coated on the surface of the side of the stator core away from the stator winding.

[0008] Optionally, the isolation coating covers the surface of the side of the stator core away from the stator winding.

[0009] Optionally, the stator further includes a housing, and the housing includes a mounting cavity, the stator core is located in the mounting cavity, and the cooling liquid passage is formed between the stator core and the housing.

[0010] Optionally, the inner wall of the side of the housing facing the stator core is coated with an isolation coating, and the isolation coating is also used to separate the housing and the cooling liquid.

[0011] Optionally, the isolation coating includes a heat-conducting layer and a hydrophobic layer stacked, the heat-conducting layer includes a heat-conducting material, and the hydrophobic layer includes a hydrophobic material.

[0012] Optionally, the difference between the thicknesses of the isolation coatings of different regions is less than a preset thickness difference.

[0013] In a second aspect, the utility model also provides a motor, including rotor and the utility model first aspect's stator.

[0014] In a third aspect, the utility model also provides a drive assembly, including the utility model second aspect's motor.

[0015] In a fourth aspect, the utility model also provides a vehicle, including the utility model third aspect's drive assembly.

[0016] In the utility model, the stator includes a stator core, the stator core includes a cooling liquid channel, the cooling liquid channel is arranged on the surface and / or inside the stator core and is used to flow through the cooling liquid, and at least part of the inner wall of the cooling liquid channel includes an isolation coating, which is used to separate the cooling liquid and the stator core. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structure diagram of a stator provided by the utility model embodiment is shown in the figure.

[0018] Figure 2 A structure diagram of a stator provided by the utility model embodiment is shown in the figure.

[0019] Figure 3 A structure diagram of a stator provided by the utility model embodiment is shown in the figure.

[0020] Figure 4 A structure diagram of a stator provided by the utility model embodiment is shown in the figure.

[0021] Figure 5 A structure diagram of an isolation coating provided by the utility model embodiment is shown in the figure.

[0022] Reference signs:

[0023] 1-stator core;2-cooling liquid channel;3-isolation coating.31-thermal conductive layer;32-hydrophobic layer;4-stator slot;5-outer shell. DETAILED DESCRIPTION

[0024] The utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all structures.

[0025] The terms used in the embodiments of the present application are merely for the purpose of describing specific embodiments, and are not intended to limit the present application. It should be noted that the orientation words such as "upper", "lower", "left", "right" and the like described in the embodiments of the present application are described with the angle shown in the drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when referring to one element being formed "on" or "under" another element, it can be directly formed "on" or "under" another element, or indirectly formed "on" or "under" another element through an intermediate element. The terms "first", "second", and the like are only for the purpose of description, and do not represent any order, quantity or importance, but are only used to distinguish different components. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The inventor found that in the existing stator structure, the cooling liquid directly contacts the stator, and the problem of cooling liquid leakage is likely to occur. Cooling liquid leakage can cause the following problems: first, performance degradation: stator cooling liquid leakage can weaken the cooling effect and increase the temperature of the stator, thereby affecting the performance of the motor. Overheating can cause the aging of motor insulation materials, reduce the insulation performance, and even cause short circuit and other problems, affecting the normal operation of the motor. Second, damage to motor components: if the stator cooling liquid leaks for a long time without timely treatment, it may cause the stator coil, insulation materials and other components to be damaged by excessive heat, thereby affecting the stability and life of the motor. Third, safety hazards: stator cooling liquid leakage can cause liquid to enter the motor interior and contact electrical components, increasing the risk of electric shock, and also causing fire and other safety hazards. Fourth, environmental impact: the leakage of cooling liquid can also pollute the surrounding environment, especially if the cooling liquid is toxic or corrosive, which can harm the environment and human health. Fifth, increased maintenance costs: stator cooling liquid leakage needs to be discovered and repaired in time, otherwise it will increase maintenance costs. If not handled in time, it may need to replace parts or perform more complex repair work, increasing maintenance costs and downtime.

[0027] Therefore, the embodiments of the present application provide a stator, which can be used in a motor, including but not limited to a drive motor in a vehicle. The stator includes a stator core, and the stator core includes a cooling liquid channel, which is arranged on the surface and / or inside of the stator core for the flow of cooling liquid.

[0028] At least part of the inner wall of the cooling liquid channel includes an isolation coating for spacing the cooling liquid and the stator core.

[0029] By setting the isolation coating on the inner wall of the cooling liquid channel, the isolation coating is used to separate the cooling liquid and the stator core, so that the leakage of the cooling liquid can be effectively improved, the reliability and stability of the motor are ensured, the service life of the motor is prolonged, and the safety hidden danger is reduced.

[0030] The above is the core idea of the utility model, and the technical solutions in the utility model embodiments will be clearly and completely described below with reference to the drawings in the utility model embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0031] Figure 1 A structure diagram of a stator provided by the utility model embodiment, Figure 2 A cross-sectional structure diagram of a stator provided by the utility model embodiment, reference Figure 1 And Figure 2 The stator comprises a stator core 1, the stator core 1 comprises a cooling liquid channel 2, the cooling liquid channel 2 is arranged on the surface and / or inside of the stator core 1 and is used to flow the cooling liquid (not shown in the figure); at least part of the inner wall of the cooling liquid channel 2 comprises an isolation coating 3, and the isolation coating 3 is used to separate the cooling liquid and the stator core 1.

[0032] As shown in Figure 1 And Figure 2 The stator core 1 is in the form of a whole ring, and the inner side comprises a plurality of stator slots 4, and the stator slots 4 are used to place stator windings (not shown in the figure). The stator core 1 can be composed of a plurality of silicon steel sheets, and the stator windings are used to be connected with an external power supply to convert the electric energy of the external power supply into magnetic energy and form a first magnetic field. The stator surrounds to form a rotor cavity, and a rotor (not shown in the figure) is arranged in the rotor cavity, and the rotor comprises a rotating shaft and a permanent magnet arranged on the rotating shaft, and the permanent magnet is used to generate a second magnetic field capable of interacting with the first magnetic field, and then drives the rotating shaft to rotate.

[0033] The stator further comprises the cooling liquid channel 2, and the position of the cooling liquid channel 2 is not limited, and those skilled in the art can set it according to actual needs, for example, it can be arranged on the outer surface of the stator core 1 as shown in Figure 1 And Figure 2 Alternatively, it is arranged inside the stator core 1, and any existing cooling liquid channel 2 design scheme is within the technical solution range of the utility model embodiments. The cooling liquid can flow in the cooling liquid channel 2, so that the stator is cooled by low-temperature cooling liquid when the temperature of the stator is high.

[0034] It is worth mentioning that, in the embodiment of the utility model, the isolation coating 3 is arranged on at least part of the inner wall of the cooling liquid channel 2. The isolation coating 3 can separate the cooling liquid in the cooling liquid channel 2 from the stator core 1 body, thereby protecting the stator core 1, that is, the isolation coating 3 is used to better encapsulate the cooling liquid in the cooling liquid channel 2, so as to avoid the leakage of the cooling liquid to other areas of the motor, effectively improve the cooling liquid leakage problem, ensure the reliability and stability of the motor, prolong the service life of the motor, and reduce the safety hazard.

[0035] In some embodiments, a coating material with high thermal conductivity, high temperature resistance and corrosion resistance can be selected, such as a metal or ceramic material with high thermal conductivity, a polymer composite with good thermal conductivity, and a special coating with corrosion resistance, but the utility model is not limited to this. In addition, the material of the isolation coating 3 should meet the safety and environmental protection requirements, and the selected coating material should meet the environmental protection regulations to avoid the use of harmful substances.

[0036] The purpose of using high thermal conductivity material to prepare the isolation coating 3 is as follows: first, to improve the heat dissipation efficiency of the stator surface, help to transfer heat to the cooling liquid faster, thereby effectively reducing the working temperature of the motor and improving the working efficiency and performance of the motor; second, to reduce the temperature gradient: the high thermal conductivity isolation coating can reduce the temperature gradient on the surface of the stator, avoid local overheating, help to reduce the influence of thermal stress on the motor components, prolong the service life of the motor, and help to more accurately control the temperature of the stator, keep the motor within the optimal working temperature range, and improve the overall efficiency and performance of the motor; third, the heat dissipation mode of the cooling liquid plus the isolation coating can make more effective use of space, so that the overall size of the motor is smaller, and is suitable for application scenarios with limited space.

[0037] The preparation process of the isolation coating 3 is not limited, and a suitable coating process can be selected according to the actual coating material, such as plasma spraying, thermal spraying and chemical vapor deposition, but the utility model is not limited to this. If the isolation coating 3 needs to be solidified after coating, a suitable solidification process can also be selected according to the actual needs, and the embodiment of the utility model does not elaborate or limit it.

[0038] The stator provided in the embodiment of the utility model separates the cooling liquid from the stator core 1 by arranging the isolation coating 3 on the inner wall of the cooling liquid channel 2, which can effectively improve the cooling liquid leakage problem, ensure the reliability and stability of the motor, prolong the service life of the motor, and reduce the safety hazard.

[0039] Optionally, reference can be made to Figure 1 and Figure 2The stator further comprises a stator winding (not shown in the figure) which is arranged in the stator slot 4 inside the stator core 1; the cooling liquid channel 2 is located on the side surface of the stator core 1 away from the stator winding, and the isolation coating 3 is coated on the side surface of the stator core 1 away from the stator winding.

[0040] The stator slot 4 is used for embedding the stator winding which is collectively referred to as a phase or an entire electromagnetic circuit composed of a plurality of coils or coil groups, and the stator winding is arranged between the stator slots 4.

[0041] As an optional embodiment, the cooling liquid channel 2 can be formed on the side surface of the stator core 1 away from the stator winding, that is, the outer surface of the stator winding. When the cooling liquid channel 2 is located on the outer surface of the stator core 1, part of the inner wall of the cooling liquid channel 2 is the surface of the stator core 1 body, and at this time, the isolation coating 3 is coated on at least part of the outer surface of the stator core 1. In this arrangement, the contact area between the cooling liquid channel 2 and the stator core 1 is larger, the coverage area of the cooling liquid is larger, and better cooling effect can be ensured; in addition, the isolation coating 3 is coated on the outer surface of the stator core 1, the preparation process of the isolation coating 3 is relatively simple, and the isolation coating 3 can comprehensively protect the stator core 1, avoiding the cooling liquid flowing into the stator winding and causing damage to the stator winding; the existence of the isolation coating 3 can also improve the wear resistance of the stator core 1, protect the surface of the stator core 1 from wear and corrosion, and prolong the service life of the motor; coating the isolation coating 3 on the outer surface can reduce the noise and vibration during the operation of the motor and improve the smoothness of the operation of the motor.

[0042] Optionally, in the preferred embodiment, the isolation coating 3 can cover the side surface of the stator core 1 away from the stator winding. Figure 3 A structure diagram of a stator core is provided for the embodiment of the utility model, referring to Figure 3 The isolation coating 3 can be coated on the entire outer surface of the stator core 1 to improve the isolation effect of the cooling liquid.

[0043] Optionally, referring to Figure 1 and Figure 2 The stator further comprises a housing 5, the housing 5 comprises a mounting cavity, the stator core 1 is located in the mounting cavity, and the cooling liquid channel 2 is formed between the stator core 1 and the housing 5.

[0044] The housing 5 is a shell structure of the stator and is used for fixing the stator core 1. Specifically, the housing 5 can form a mounting cavity inside, the stator core 1 is fixed inside the mounting cavity, and a gap can exist between the stator core 1 and the housing 5, which is used as the cooling liquid channel 2 for the flow of the cooling liquid.

[0045] Optionally, Figure 1The cooling liquid channel 2 is arranged around the circumference of the stator core 1, and is not limited to this. In other embodiments not shown in the utility model, the cooling liquid channel 2 can also be arranged along the axial direction of the stator core 1. In addition, a protruding structure can be formed on the outer surface of the stator core 1, and the protruding structure and the shell 5 jointly define the cooling liquid channel 2.

[0046] Optionally, Figure 4 Another structure diagram of a stator provided by the utility model is shown in FIG. 4. Figure 4 In some other embodiments, the inner wall of the side of the shell 5 facing the stator core 1 is coated with an isolation coating 3, and the isolation coating 3 is also used to separate the shell 5 and the cooling liquid (not shown in the figure).

[0047] In this embodiment, the isolation coating 3 can also be coated on the inner wall of the shell 5, and the isolation coating 3 also separates the cooling liquid and the shell 5. In this arrangement, the inner wall of the cooling liquid channel 2 is covered with the isolation coating 3, which can greatly prevent the cooling liquid from leaking, and also helps the stator to quickly transfer heat outward.

[0048] Optionally, Figure 5 A structure diagram of an isolation coating provided by the utility model is shown in FIG. 5. Figure 5 In some embodiments, the isolation coating 3 can include a heat-conducting layer 31 and a hydrophobic layer 32 arranged in layers, the heat-conducting layer 31 includes a heat-conducting material, and the hydrophobic layer 32 includes a hydrophobic material.

[0049] The heat-conducting material can refer to a high-thermal-conductivity material, such as the metal material with high thermal conductivity mentioned in the above embodiments. The use of the heat-conducting material to form the heat-conducting layer 31 can ensure the heat transfer effect. The hydrophobic material is a material that can make the surface of a liquid tense, such as a high-molecular polymer material. The cooling liquid includes water, and the use of the hydrophobic material to prepare the isolation coating 3 can ensure the isolation effect of the cooling liquid and prevent the cooling liquid from leaking into the stator.

[0050] By arranging the heat-conducting layer 31 and the hydrophobic layer 32 in layers, the heat-conducting layer 31 and the hydrophobic layer 32 can be prepared separately, so that the thickness of each film layer can be adjusted according to actual needs, and the flexibility of the thickness of each film layer can be realized.

[0051] The number of layers and the relative position relationship of the heat-conducting layer 31 and the hydrophobic layer 32 are not limited. For example, in some embodiments, the isolation coating 3 can include one heat-conducting layer 31 and one hydrophobic layer 32, the hydrophobic layer 32 is located on the side of the heat-conducting layer 31 away from the stator slot 4, the heat-conducting layer 31 covers the surface of the stator core 1, and the hydrophobic layer 32 is in contact with the cooling liquid. In some other embodiments, the isolation coating 3 can include two heat-conducting layers 31 and one hydrophobic layer 32, and the two heat-conducting layers 31 are located on the two sides of the hydrophobic layer 32, thereby improving the heat transfer efficiency.

[0052] In other embodiments of the present application, the heat-conducting material and the hydrophobic material can be the same, for example, a high-thermal-conductivity polymer composite material. In this way, the isolation coating 3 can be a single-layer structure made of a polymer composite material, and the isolation coating 3 is relatively simple to prepare and has a relatively small thickness.

[0053] Optionally, in some embodiments, the difference in thickness of the isolation coating 3 in different regions is less than a preset thickness difference.

[0054] The specific value of the preset thickness difference is not limited, and can be a value close to 0. In the present embodiment, when the isolation coating 3 is prepared, the uniformity of the thickness of the isolation coating 3 should be ensured, and the thickness of the isolation coating 3 in different regions is similar or the same, so that the heat conduction efficiency of each region of the stator core 1 is consistent, and the problem of local overheating is avoided.

[0055] The stator provided in the embodiments of the present application can also include any structure known to those skilled in the art, which is not limited in the embodiments of the present application.

[0056] The present application also provides a motor, which comprises a rotor and the stator provided in any of the embodiments of the present application.

[0057] The stator is connected to an external power source to convert the electrical energy of the external power source into magnetic energy and form a first magnetic field. The stator surrounds to form a rotor cavity, and a rotor (not shown in the figure) is arranged in the rotor cavity. The rotor comprises a rotating shaft and a permanent magnet arranged on the rotating shaft. The permanent magnet is used to generate a second magnetic field capable of interacting with the first magnetic field, thereby driving the rotating shaft to rotate.

[0058] The specific positional relationship between the stator and the rotor can be set according to actual needs, and the embodiments of the present application are not described or limited.

[0059] The motor formed by the stator in the embodiments of the present application has high reliability, stability and service life, and helps to improve the overall efficiency and performance of the motor.

[0060] The present application also provides a drive assembly, which comprises the motor provided in any of the embodiments of the present application.

[0061] The drive assembly comprises a motor and a transmission. The motor serves as the power source of the drive assembly and is used to provide power for the power assembly. One end of the transmission is drivingly connected to the motor, and the other end is drivingly connected to the wheel. The transmission is used to adjust the torque of the motor acting on the wheel, and the speed of the wheel is adjusted by adjusting the torque of the wheel, thereby adjusting the speed of the vehicle.

[0062] The present application also provides a vehicle, which comprises the drive assembly provided in any of the embodiments of the present application.

[0063] The vehicle can be a new energy vehicle or a fuel vehicle. The vehicle can be a car, a train or a motorcycle, and the embodiments of the utility model do not limit this. The vehicle comprises a vehicle body, wheels and a drive assembly. The vehicle body is a supporting structure of the vehicle and is used for supporting and connecting other assemblies of the vehicle. The wheels are rotatably connected to the vehicle body. The vehicle body can be provided with two, three or four wheels, and the embodiments of the utility model do not limit this. The drive assembly is accommodated in the vehicle body and is drivingly connected to the wheels. The drive assembly is used for driving the wheels to rotate and then driving the vehicle to move.

[0064] The vehicle further comprises a condensing system, which comprises a condensing device and a hydraulic device. The condensing device is used for cooling the cooling liquid, and the hydraulic device is used for controlling the flow of the cooling liquid in the motor and then realizing the cooling of the motor. The cooling liquid can be cooling oil, fluorinated coolant or ethylene glycol, and the embodiments of the utility model do not limit this.

[0065] It should be noted that the above are only the preferred embodiments of the utility model and the technical principles applied. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments, mutual combinations and substitutions without departing from the protection scope of the utility model. Therefore, although the utility model has been described in detail through the above embodiments, the utility model is not limited to the above embodiments, and more other equivalent embodiments can be included without departing from the concept of the utility model, and the scope of the utility model is determined by the appended claims.

Claims

1. A stator characterized by, The stator core comprises a cooling liquid channel arranged on the surface and / or inside of the stator core for flowing of the cooling liquid; At least part of the inner wall of the cooling liquid channel comprises an isolation coating for spacing the cooling liquid and the stator core.

2. The stator of claim 1, wherein The stator further comprises a stator winding arranged in the stator slot inside the stator core; The cooling liquid channel is arranged on the surface of the side of the stator core away from the stator winding, and the isolation coating is arranged on the surface of the side of the stator core away from the stator winding.

3. A stator according to claim 2, characterised in that The isolation coating covers the surface of the side of the stator core away from the stator winding.

4. The stator of claim 2, wherein The stator further comprises a housing comprising a mounting cavity, and the stator core is arranged in the mounting cavity, and the cooling liquid channel is formed between the stator core and the housing.

5. A stator according to claim 4, characterised in that The inner wall of the side of the housing facing the stator core is coated with the isolation coating, and the isolation coating is also used for spacing the housing and the cooling liquid.

6. The stator of claim 1, wherein The isolation coating comprises a heat-conducting layer and a hydrophobic layer arranged in layers, the heat-conducting layer comprises a heat-conducting material, and the hydrophobic layer comprises a hydrophobic material.

7. The stator of claim 1, wherein The difference between the thicknesses of the isolation coating in different regions is less than a preset thickness difference value.

8. An electric machine characterized by The electric machine comprises a rotor and the stator according to any one of claims 1-7.

9. A drive assembly characterized by, The electric machine comprises the electric machine according to claim 8.

10. A vehicle characterized by comprising: The drive assembly comprises the drive assembly according to claim 9.

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