Motors and electric drive equipment

Abstract

This application provides an electric motor and an electric drive device. The stator assembly includes: a stator housing, an internal liquid cooling path formed inside the stator housing, and an air-cooled section formed at one axial end of the stator housing. A liquid storage chamber is provided within the air-cooled section, and the cooling medium in the liquid storage chamber is suitable for supplying to the internal liquid cooling path. The air-cooled section is used to cool the cooling medium in the liquid storage chamber and is located on the airflow path of the impeller disturbance. Therefore, on the one hand, the motor can be cooled using a hybrid air-cooling and liquid-cooling method, which can initially improve the cooling efficiency and effect of the motor; on the other hand, the cooling medium in the liquid storage chamber can be cooled by the air-cooled section in conjunction with the airflow disturbance of the impeller, achieving cooling inside the stator housing at a lower initial temperature. This not only improves the cooling effect and efficiency of the internal liquid cooling path but also eliminates the need for an external fan, simplifying the motor structure, reducing the overall space occupied by the motor, and lowering the cost of the motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a motor and an electric drive device. Background Technology

[0002] In related technologies, motors are cooled solely by air cooling or liquid cooling, which is a single cooling method with poor cooling effect, making it difficult to meet the cooling requirements of motors. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this application is to provide a motor with better cooling effect and higher cooling efficiency.

[0004] This application further proposes an electric drive device employing the aforementioned motor.

[0005] In a first aspect, this application provides an electric motor, comprising: a stator assembly and a rotor assembly, the rotor assembly being rotatably mounted on the stator assembly relative to the stator assembly, the rotor assembly having an impeller; wherein

[0006] The stator assembly includes: a stator housing, an internal liquid cooling path formed inside the stator housing, an air-cooled housing section formed at one axial end of the stator housing, a liquid storage chamber provided in the air-cooled housing section, a cooling medium in the liquid storage chamber being suitable for supplying to the internal liquid cooling path, and the air-cooled housing section being used to cool the cooling medium in the liquid storage chamber, and the air-cooled housing section being located on the airflow path of the impeller disturbance.

[0007] According to the embodiments of this application, an internal liquid cooling path is formed inside the stator housing of the motor, and one axial end of the stator housing is formed as an air-cooled housing section. A liquid storage chamber for supplying cooling medium to the internal liquid cooling path is disposed in the air-cooled housing section. The air-cooled housing section is located on the flow path of the airflow disturbed by the impeller on the rotor assembly. On the one hand, the motor can be cooled by a combination of air cooling and liquid cooling, which can initially improve the cooling efficiency and cooling effect of the motor. On the other hand, the cooling medium in the liquid storage chamber can be cooled by the air-cooled housing section in conjunction with the airflow disturbed by the impeller, and is cooled inside the stator housing at a lower initial temperature. This not only realizes the linkage of air cooling and liquid cooling to improve the cooling effect and cooling efficiency of the internal liquid cooling path, but also eliminates the need for an external fan. Cooling linkage can be achieved by the impeller itself equipped in the motor, which can also simplify the motor structure, reduce the overall space occupation of the motor, and reduce the cost of the motor.

[0008] According to some embodiments of this application, a stator winding, a PEU, a stator shaft, and a medium pump are disposed inside the stator housing. The medium pump and the liquid storage chamber are located at the two axial ends of the stator shaft. The stator shaft, stator housing, stator winding, PEU, medium pump, and liquid storage chamber define the internal liquid cooling path.

[0009] In the above technical solution, the PEU can be integrated inside the stator assembly. While improving the space occupied by the motor, the stator winding and PEU can be cooled through the internal liquid cooling path. This not only improves the cooling effect and efficiency, but also eliminates the need for a separate cooling structure for the PEU, further simplifying the motor structure. Moreover, the PEU has a better cooling effect through liquid cooling, and its working stability and reliability are higher, which can also improve the working stability and reliability of the motor.

[0010] According to some embodiments of this application, a supply channel is provided inside the stator shaft, and a return channel is provided on the stator housing. One end of the supply channel is connected to the liquid storage chamber, and the other end of the supply channel is connected to the liquid inlet of the medium pump. One end of the return channel is connected to the liquid outlet of the medium pump, and the other end of the return channel is connected to the liquid storage chamber.

[0011] In the above technical solution, on the one hand, the liquid storage chamber and the medium pump are located at both ends of the stator shaft, which can make full use of the axial space of the stator shaft to improve the space occupation of the motor. On the other hand, the medium pump draws the cooling medium along the axis and supplies it to the return flow channel. The return flow channel is arranged on the radial outside of the supply flow channel. The arrangement range of the return flow channel is larger, and the cooling area of ​​the stator winding and PEU can be set to be larger. This can reduce the limitations of the traditional flow channel arrangement, increase the coverage area, and improve the cooling effect and cooling efficiency.

[0012] According to some embodiments of this application, the stator shaft is constructed as a hollow shaft, and the inner hole of the stator shaft is formed as a supply flow channel, or a return pipe is provided in the inner hole, and the return pipe defines the supply flow channel.

[0013] In the above technical solutions, in the embodiment where the inner hole is formed as the supply flow channel, the structure of the internal liquid cooling path is simpler, the cost is lower, and the layout is easier. In the embodiment where a return pipe is set inside the inner hole, the diameter of the return pipe can be reasonably set based on the cooling requirements, so that the flow pressure of the cooling medium is greater, the flow rate can be faster, and the cooling effect can be better.

[0014] According to some embodiments of this application, the supply channel extends to the side wall of the reservoir away from the medium pump.

[0015] In the above technical solution, on the one hand, the cooling medium in the liquid storage chamber can participate in the circulation more comprehensively, which can reduce the probability of the cooling medium level being too low, causing the medium pump to have difficulty effectively supplying the cooling medium to the return flow channel. This can improve the cooling reliability and stability of the internal cooling path. On the other hand, the side wall of the liquid storage chamber away from the medium pump corresponds to the inner end face of one axial end of the stator housing, while the outer end face corresponding to the inner end face corresponds to the outer end face of the air-cooled shell section. The temperature of the cooling medium closer to this end face is lower, which can also allow the lower-temperature cooling medium to participate in the internal cooling, further improving the cooling efficiency and cooling effect of the internal liquid cooling path.

[0016] According to some embodiments of this application, the stator housing includes: a first housing segment having a receiving cavity for accommodating the stator winding and PEU; a first flow channel segment being provided inside the first housing segment; one end of the first flow channel segment being connected to the outlet of the medium pump; and the other end of the first flow channel segment supplying cooling medium to the receiving cavity.

[0017] In the above technical solution, by setting the first flow channel section, the cooling medium pumped out by the medium pump can maintain a certain flow pressure in the first flow channel section, and can be sprayed onto the stator winding and PEU in the accommodating cavity based on the flow pressure, thereby improving the cooling effect and cooling efficiency.

[0018] According to some embodiments of this application, the stator housing further includes: a second housing segment, the second housing segment being located between the air-cooled housing segment and the first housing segment, the first housing segment further including: a second flow channel segment, the second housing segment having a third flow channel segment, one end of the second flow channel segment communicating with the receiving cavity, the other end of the second flow channel segment communicating with the third flow channel segment, and the other end of the third flow channel segment communicating with the liquid storage cavity.

[0019] In the above technical solution, on the one hand, by setting the first flow channel section, the second flow channel section and the third flow channel section, the flow channel length on the stator shell is longer, which can fully realize the cooling and temperature reduction of the stator shell; on the other hand, the cooling medium can always flow within the flow channel section, so that the cooling medium can maintain a certain flow pressure, so that the flow rate of the cooling medium is faster and the cooling effect is better.

[0020] According to some embodiments of this application, the air-cooled shell section has a fourth flow channel section, one end of which is connected to the third flow channel section, and the other end of which is connected to the liquid storage chamber.

[0021] In the above technical solution, on the one hand, by setting the fourth flow channel section, a complete return flow channel can be formed, and the return flow channel can cover the first shell section, the second shell section and the third shell section, so as to improve the cooling effect on the stator shell; on the other hand, the fourth flow channel section can be arranged around the air-cooled shell section, so that the cooling medium returning through the fourth flow channel section can achieve air cooling heat dissipation with the air-cooled shell section before flowing into the liquid storage cavity, which can further improve the cooling effect of the air-cooled shell section on the cooling medium, further reduce the initial temperature of the cooling medium, and improve the cooling effect and cooling efficiency of the internal liquid cooling path.

[0022] According to some embodiments of this application, the first shell section includes a first end plate, a second end plate, and a first radial cylinder that are axially opposite to each other. The first end plate, the second end plate, and the first radial cylinder define a receiving cavity. A first flow channel section is provided in the first end plate, and a second flow channel section is provided in the second end plate. The second shell section includes a second radial cylinder that is connected to the second end plate, and a third flow channel section is located inside the second radial cylinder.

[0023] In the above technical solution, the first end plate, the first radial cylinder, and the second end plate define a receiving cavity to accommodate the stator winding and PEU. The first end plate and the second end plate are respectively formed with a first flow channel section and a second flow channel section, so that one side wall of the receiving cavity is used to supply cooling medium to the receiving cavity, and the other side wall of the receiving cavity is used to return the cooling medium. The flow path of the cooling medium is more reasonable, and the cooling effect on the stator winding and PEU is better. The third flow channel section is formed in the second radial cylinder and communicates with the second flow channel section, which increases the length of the return flow channel in the stator housing to improve the cooling effect on the stator housing.

[0024] According to some embodiments of this application, the stator winding and the PEU are arranged sequentially along the axial direction within the accommodating cavity, or the stator winding and the PEU overlap at least partially along the radial direction within the accommodating cavity.

[0025] In the above technical solution, the space occupied by the hollow part of the stator winding can be utilized to improve the space occupied by the motor.

[0026] According to some embodiments of this application, the media pump is located outside the accommodating cavity, or at least a portion of the media pump is located inside the accommodating cavity.

[0027] According to some embodiments of this application, the rotor housing of the rotor assembly has a third housing section sleeved on the first housing section and a fourth housing section sleeved on the second housing section. The rotor is disposed in the third housing section, and an impeller is disposed on the fourth housing section. Bearings are disposed between the first housing section and the third housing section, and between the second housing section and the fourth housing section.

[0028] In the above technical solution, the bearings between the first and third housing sections and between the second and fourth housing sections can reduce the friction between the rotor assembly and the stator assembly, making the rotor assembly rotate more smoothly. An impeller is arranged on the radial outer side of the fourth housing section so that the impeller can rotate synchronously with the rotor housing and disturb the airflow to achieve air cooling of the stator assembly and the air-cooled housing section.

[0029] According to some embodiments of this application, the air-cooled shell section is provided with radially extending heat dissipation fins, and the rotor shell further includes: a fifth shell section, which is sleeved on the heat dissipation fins, and the fifth shell section is provided with an air outlet on the side facing the impeller, so that the heat dissipation fins are located upstream of the impeller in the airflow path.

[0030] In the above technical solution, the fifth shell section may include an end plate and a radial plate. The end plate is connected to the fourth shell section. The radial plate is provided on the outer periphery of the end plate. The radial plate can provide protection for the heat dissipation fins on the outside of the heat dissipation fins to improve the overall structural strength and reliability of the motor. An air outlet is formed on the end plate. The impeller is located downstream of the end plate in the airflow path. When the impeller disturbs the airflow, the airflow can flow through the heat dissipation fins, the air outlet, and the impeller in sequence, so that the heat dissipation fins are located on the airflow path to achieve enhanced air cooling of the air-cooled shell section, realize the combination and linkage of air cooling and liquid cooling, and improve the cooling efficiency and cooling effect inside the stator assembly.

[0031] Secondly, this application provides an electric drive device, including: the motor in the above embodiments.

[0032] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0033] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0034] Figure 1 This is a schematic diagram of a motor according to the first embodiment of this application;

[0035] Figure 2 This is another schematic diagram of a motor according to the first embodiment of this application;

[0036] Figure 3 This is a schematic diagram of a motor according to the second embodiment of this application;

[0037] Figure 4 This is another schematic diagram of a motor according to the second embodiment of this application;

[0038] Figure 5 This is a schematic diagram of a motor according to a third embodiment of this application;

[0039] Figure 6 This is another schematic diagram of a motor according to the third embodiment of this application;

[0040] Figure 7 This is a schematic diagram of an electrically driven device according to an embodiment of this application.

[0041] Figure label:

[0042] 1000 electric drive devices

[0043] Motor 100,

[0044] Stator assembly 10, stator housing 11, first housing section 111, first end plate 1111, first flow channel section 1112, first radial cylinder 1113, second end plate 1114, second flow channel section 1115, second housing section 112, third flow channel section 1121, air-cooled housing section 113, heat dissipation fins 1131, fourth flow channel section 1132, liquid storage chamber 1133, stator winding 12, PEU 13, stator shaft 14, supply flow channel 141, return pipe 142, medium pump 15.

[0045] Rotor assembly 20, rotor housing 21, third housing section 211, fourth housing section 212, fifth housing section 213, air outlet 2131, rotor 22, impeller 23.

[0046] Bearing 30,

[0047] Axial direction X, radial direction Y. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0050] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0053] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0054] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0055] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0056] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0057] In this application, "multiple" means two or more (including two).

[0058] An electric motor consists of a stator assembly and a rotor assembly. The rotor assembly can rotate relative to the stator assembly. However, the motor generates a lot of heat during operation, so a cooling structure is needed to cool the motor during operation.

[0059] In existing technologies, the stator assembly is generally cooled by setting a hollow stator shaft and using an air-cooling structure on the stator assembly. However, air cooling alone is inefficient and requires an external fan, which takes up a lot of space. Alternatively, liquid cooling channels can be set inside the stator assembly to cool it through liquid cooling. However, this provides a single heat dissipation path and can only serve as a local heat dissipation path. The overall cooling effect of the stator assembly is also difficult to meet the usage requirements.

[0060] Based on this, this application proposes an electric motor in which an internal liquid cooling path is defined inside the stator housing, and the liquid storage chamber is located within an air-cooled housing section. The air-cooled housing section is located on the flow path of the airflow disturbed by the motor impeller, so that air cooling can be linked with liquid cooling. By reducing the temperature of the cooling medium in the liquid storage chamber through air cooling, the lower-temperature cooling medium cools the inside of the stator assembly. Combined with external air cooling, the stator assembly and rotor assembly are cooled, thereby improving cooling efficiency and cooling effect.

[0061] The following is for reference. Figures 1-7This application describes a motor 100 and an electric drive device 1000 according to embodiments thereof.

[0062] like Figure 1 , Figure 3 and Figure 5 As shown, this application provides an electric motor 100, including: a stator assembly 10 and a rotor assembly 20, the rotor assembly 20 being rotatably mounted on the stator assembly 10 relative to the stator assembly 10, and the rotor assembly 20 having an impeller 23.

[0063] Among them, see Figure 2 , Figure 4 as well as Figure 6 As shown, the stator assembly 10 includes: a stator housing 11, an internal liquid cooling path formed inside the stator housing 11, an air-cooled housing section 113 formed at one axial end of the stator housing 11, a liquid storage chamber 1133 provided inside the air-cooled housing section 113, a cooling medium in the liquid storage chamber 1133 suitable for supplying to the internal liquid cooling path, and the air-cooled housing section 113 is used to cool the cooling medium in the liquid storage chamber 1133, and the air-cooled housing section 113 is located on the airflow path disturbed by the impeller 23.

[0064] Specifically, one axial end of the stator housing 11 is formed as an air-cooled housing section 113, which can be located on the airflow path of the impeller 23 disturbing the airflow. For example, the air-cooled housing section 113 can be located upstream or downstream of the impeller 23 in the airflow path, so that when the impeller 23 disturbs the airflow, the airflow can first flow through the air-cooled housing section 113 and then through the impeller 23, or the airflow can first flow through the impeller 23 and then through the air-cooled housing section 113. The external airflow can achieve cooling of the rotor assembly 20 and the air-cooled housing section 113, so that the temperature of the cooling medium in the liquid storage chamber 1133 inside the air-cooled housing section 113 can be reduced, and the cooling medium can participate in the cooling of the internal liquid cooling path. The cooling medium with a lower initial temperature can improve the cooling effect and cooling efficiency of the internal liquid cooling path.

[0065] It is understandable that the internal liquid cooling path formed inside the stator housing 11 means that a liquid cooling circuit can be formed inside the stator housing 11. The liquid cooling circuit can take the cooling medium from the liquid storage chamber 1133 and return the cooling medium with the increased temperature after cooling to the liquid storage chamber 1133. The liquid storage chamber 1133 cools the internal cooling medium through the air-cooled shell section 113, so that the temperature of the cooling medium can always be kept at a lower initial temperature. The lower initial temperature of the cooling medium can improve the cooling capacity of the internal liquid cooling path.

[0066] The cooling medium involved in the embodiments of this application can be hydrocarbon oil, synthetic oil, water-based coolant, fluorinated liquid, etc.

[0067] According to the embodiments of this application, the motor 100 has an internal liquid cooling path formed inside the stator housing 11, and one axial end of the stator housing 11 is formed as an air-cooled shell section 113. A liquid storage chamber 1133 for supplying cooling medium to the internal liquid cooling path is disposed in the air-cooled shell section 113. The air-cooled shell section 113 is located on the flow path of the airflow disturbed by the impeller 23 on the rotor assembly 20. On the one hand, the motor 100 can be cooled by a combination of air cooling and liquid cooling, which can initially improve the cooling efficiency and cooling effect of the motor 100. On the other hand, the cooling medium in the liquid storage chamber 1133 can be cooled by the airflow disturbed by the air-cooled shell section 113 and the impeller 23, so that it can be cooled inside the stator shell 11 at a lower initial temperature. This not only realizes the linkage between air cooling and liquid cooling to improve the cooling effect and efficiency of the internal liquid cooling path, but also eliminates the need for an external fan. The cooling linkage can be achieved by the impeller 23 equipped on the motor 100 itself. This also simplifies the structure of the motor 100, reduces the overall space occupied by the motor 100, and reduces the cost of the motor 100.

[0068] like Figure 2 , Figure 4 as well as Figure 6 As shown, according to some embodiments of this application, the stator housing 11 is provided with a stator winding 12, a PEU13 (Power Electronics Unit, which is the core module for realizing power conversion, control and distribution, equivalent to the "power hub" of the electric drive device 1000. It converts electrical energy (such as battery DC power or grid AC power) into a form of electrical energy adapted to the motor 100 (such as frequency-adjustable AC power) through power electronic devices such as IGBTs (composite power semiconductor devices) and SiC chips, while realizing the speed and torque control of the motor 100 and system protection), a stator shaft 14, and a medium pump 15. The medium pump 15 and the liquid storage chamber 1133 are located at the two axial ends of the stator shaft 14. The stator shaft 14, stator housing 11, stator winding 12, PEU13, medium pump 15 and liquid storage chamber 1133 define the internal liquid cooling path.

[0069] It should be pointed out that, Figure 2 , Figure 4 as well as Figure 6 In the diagram, the arrows indicate the internal liquid cooling path. Based on the differences in the relative positions of the stator winding 12 and PEU13 inside the stator housing 11 in the first, second, and third embodiments, the internal liquid cooling paths are slightly different. However, the overall internal liquid cooling path is the same: liquid storage chamber 1133 → stator shaft 14 → medium pump 15 → stator housing 11 → stator winding 12 and PEU13 → stator housing 11 → liquid storage chamber 1133.

[0070] Specifically, PEU13 and stator winding 12 are integrated inside the stator housing 11. The integrated setting of PEU13 can reduce the overall space occupied by the motor 100. Both PEU13 and stator winding 12 participate in defining the internal liquid cooling path, so that PEU13 and stator winding 12 can be cooled simultaneously or sequentially by the cooling medium pumped out by the medium pump 15 in the liquid storage chamber 1133.

[0071] In this way, PEU13 can be integrated inside the stator assembly 10. While improving the space occupied by the motor 100, the stator winding 12 and PEU13 can be cooled through the internal liquid cooling path. This not only improves the cooling effect and efficiency, but also eliminates the need for a separate cooling structure for PEU13, further simplifying the structure of the motor 100. Moreover, the liquid cooling effect of PEU13 is better, and the working stability and reliability of PEU13 are higher, which can also improve the working stability and reliability of the motor 100.

[0072] It should be noted that in the prior art, PEU13 is generally mounted on the outside of motor 100 rather than integrated inside motor 100, which occupies a large space and requires a separate air-cooling structure to cool PEU13. However, PEU13 generates a lot of heat, and the cooling efficiency of air cooling alone is insufficient to meet its cooling requirements. In contrast, this application uses a liquid cooling medium with a higher specific heat capacity for cooling, which has a better cooling effect, resulting in a lower operating temperature for PEU13 and higher operating stability and reliability.

[0073] Combination Figure 2 , Figure 4 as well as Figure 6 As shown, according to some embodiments of this application, a supply channel 141 is provided inside the stator shaft 14, and a return channel is provided on the stator housing 11. One end of the supply channel 141 is connected to the liquid storage chamber 1133, and the other end of the supply channel 141 is connected to the liquid inlet of the medium pump 15. One end of the return channel is connected to the liquid outlet of the medium pump 15, and the other end of the return channel is connected to the liquid storage chamber 1133.

[0074] It should be noted that in the accompanying drawings of this application, the supply channel 141, return channel, etc. in the embodiments of this application are indicated by arrows. For example, the supply channel 141 is indicated by an arrow line extending from the liquid storage chamber 1133 to the medium pump 15 and pointing to the medium pump 15. The return channel is indicated by an arrow line extending from the medium pump 15 to the left and right sides, an arrow line pointing to the stator winding 12, an arrow line pointing to the PEU 13, an arrow line inside the motor 100 housing, and an arrow line pointing to the liquid storage chamber 1133.

[0075] The medium pump 15 pumps the cooling medium in the liquid storage chamber 1133 out through the supply channel 141 and generates driving force to pump the cooling medium into the return channel. The cooling medium in the return channel completes the liquid cooling of the stator shell, stator winding 12 and PEU13 and then flows back to the liquid storage chamber 1133. The cooling medium in the liquid storage chamber 1133 is cooled by air through the air-cooled shell section 113.

[0076] Therefore, on the one hand, the liquid storage chamber 1133 and the medium pump 15 are located at both ends of the stator shaft 14, which can make full use of the axial space of the stator shaft 14 to improve the space occupation of the motor 100. On the other hand, the medium pump 15 draws cooling medium along the axial direction and supplies it to the return flow channel. The return flow channel is arranged on the radial outside of the supply flow channel 141. The arrangement range of the return flow channel is larger, and the cooling area of ​​the stator winding 12 and PEU13 can be set to be larger. This can reduce the limitations of the traditional flow channel arrangement, increase the coverage area, and improve the cooling effect and cooling efficiency.

[0077] According to some embodiments of this application, the stator shaft 14 is constructed as a hollow shaft, and the inner hole of the stator shaft 14 is formed as a supply flow channel 141, or a return pipe 142 is provided in the inner hole, and the return pipe 142 defines the supply flow channel 141.

[0078] Specifically, in some embodiments, the inner bore of the stator shaft 14 is formed as a supply flow channel 141, and in other embodiments, a return pipe 142 is provided in the inner bore, which defines the supply flow channel 141.

[0079] It is understandable that in the embodiment where the inner hole is formed as the supply channel 141, the internal liquid cooling path has a simpler structure, lower cost, and is easier to arrange. In the embodiment where the return pipe 142 is set inside the inner hole, the diameter of the return pipe 142 can be reasonably set based on the cooling requirements, so that the flow pressure of the cooling medium is greater, the flow rate is faster, and the cooling effect is better.

[0080] Combination Figure 1 , Figure 3 and Figure 5 As shown, according to some embodiments of this application, the supply channel 141 extends to the side wall of the liquid storage chamber 1133 away from the medium pump 15.

[0081] Specifically, the liquid storage chamber 1133 is located at one axial end of the stator housing 11, and the supply channel 141 extends to the side wall of the outlet pump away from the medium pump 15. On the one hand, the cooling medium in the liquid storage chamber 1133 can participate in the flow more comprehensively, which can reduce the probability of the cooling medium level being too low, causing the medium pump 15 to have difficulty effectively supplying the cooling medium to the return channel. This can improve the cooling reliability and stability of the internal cooling path. On the other hand, the side wall of the liquid storage chamber 1133 away from the medium pump 15 corresponds to the inner end face of one axial end of the stator housing 11, and the outer end face corresponding to the inner end face corresponds to the outer end face of the air-cooled shell section 113. The temperature of the cooling medium closer to this end face is lower, which can also allow the lower-temperature cooling medium to participate in the internal cooling, further improving the cooling efficiency and cooling effect of the internal liquid cooling path.

[0082] Combination Figure 2 , Figure 4 as well as Figure 6 As shown, according to some embodiments of this application, the stator housing 11 includes: a first housing section 111, the first housing section 111 having a receiving cavity for receiving the stator winding 12 and PEU 13, a first flow channel section 1112 being provided inside the first housing section 111, one end of the first flow channel section 1112 being connected to the liquid outlet of the medium pump 15, and the other end of the first flow channel section 1112 supplying cooling medium to the receiving cavity.

[0083] In other words, the return flow channel includes a first flow channel section 1112 formed on the first shell section 111. The first flow channel section 1112 is used to communicate with the outlet of the medium pump 15 so that the cooling medium pumped out by the medium pump 15 can enter the first flow channel section 1112 and the other end of the first flow channel section 1112 supplies the cooling medium to the receiving cavity.

[0084] Specifically, the first flow channel section 1112 may have multiple outlets, some of which are set to the stator winding 12 and some of which are set to the PEU13, so that some of the cooling medium can flow into the accommodating cavity to cool the stator winding 12, and other of the cooling medium can flow into the accommodating cavity to cool the PEU13.

[0085] In this way, by setting the first flow channel section 1112, the cooling medium pumped out by the medium pump 15 can maintain a certain flow pressure in the first flow channel section 1112, and can be sprayed onto the stator winding 12 and PEU13 in the accommodating cavity based on the flow pressure, thereby improving the cooling effect and cooling efficiency.

[0086] According to some embodiments of this application, the stator housing 11 further includes: a second housing segment 112, the second housing segment 112 being located between the air-cooled housing segment 113 and the first housing segment 111, the first housing segment 111 further including: a second flow channel segment 1115, the second housing segment 112 having a third flow channel segment 1121, one end of the second flow channel segment 1115 communicating with the receiving cavity, the other end of the second flow channel segment 1115 communicating with the third flow channel segment 1121, and the other end of the third flow channel segment 1121 communicating with the liquid storage cavity 1133.

[0087] The return flow channel also includes a second flow channel section 1115 formed in the first shell section 111 and a third flow channel section 1121 formed in the third shell section 211. The first flow channel section 1112 is located on the side of the accommodating cavity adjacent to the medium pump 15 in the axial direction, and the second flow channel section 1115 is located on the side of the accommodating cavity away from the medium pump 15 in the axial direction, so that the cooling medium that has completed the cooling of the stator winding 12 and PEU13 in the accommodating cavity can flow into the second flow channel section 1115 and flow into the third flow channel section 1121 through the second flow channel section 1115, and further return to the liquid storage cavity 1133 through the third flow channel section 1121.

[0088] Therefore, on the one hand, by setting the first flow channel section 1112, the second flow channel section 1115 and the third flow channel section 1121, the flow channel length on the stator housing 11 is longer, which can fully realize the cooling of the stator housing 11; on the other hand, the cooling medium can always flow in the flow channel section, so that the cooling medium can maintain a certain flow pressure, so that the flow rate of the cooling medium is faster and the cooling effect is better.

[0089] like Figure 2 , Figure 4 as well as Figure 6 As shown, according to some embodiments of this application, the air-cooled shell section 113 has a fourth flow channel section 1132, one end of the fourth flow channel section 1132 is connected to the third flow channel section 1121, and the other end of the fourth flow channel section 1132 is connected to the liquid storage chamber 1133.

[0090] Specifically, the air-cooled shell section 113 may include a radial plate portion and two axially opposite end plate portions. The fourth flow channel section 1132 includes a first section, a second section, and a third section. One end of the first section is connected to the third flow channel section 1121. The first section extends radially along the end plate portion adjacent to the second shell section 112. The other end of the first section is connected to the second section. The second section extends along the radial plate portion and the other end of the second section is connected to the third section. The third section extends along the end plate portion of the air channel section away from the second shell section 112, and the other end of the third section is connected to the liquid storage chamber 1133.

[0091] Therefore, on the one hand, by setting the fourth flow channel section 1132, a complete return flow channel can be formed, and the return flow channel can cover the first shell section 111, the second shell section 112 and the third shell section 211, so as to improve the cooling effect on the stator shell; on the other hand, the fourth flow channel section 1132 can be arranged around the air-cooled shell section 113, so that the cooling medium returning through the fourth flow channel section 1132 can achieve air cooling heat dissipation with the air-cooled shell section 113 before flowing into the liquid storage chamber 1133, which can further improve the cooling effect of the air-cooled shell section 113 on the cooling medium, so as to further reduce the initial temperature of the cooling medium and improve the cooling effect and cooling efficiency of the internal liquid cooling path.

[0092] According to some embodiments of this application, the first shell section 111 includes a first end plate 1111, a second end plate 1114 disposed axially opposite to each other, and a first radial cylinder 1113 extending radially. The first end plate 1111, the second end plate 1114, and the first radial cylinder 1113 define a receiving cavity. A first flow channel section 1112 is disposed in the first end plate 1111, and a second flow channel section 1115 is disposed in the second end plate 1114. The second shell section 112 includes a second radial cylinder connected to the second end plate 1114, and a third flow channel section 1121 is located inside the second radial cylinder.

[0093] The first end plate 1111, the first radial cylinder 1113, and the second end plate 1114 define a receiving cavity to accommodate the stator winding 12 and PEU13. The first end plate 1111 and the second end plate 1114 are respectively formed with a first flow channel section 1112 and a second flow channel section 1115, so that one side wall of the receiving cavity is used to supply cooling medium to the receiving cavity, and the other side wall of the receiving cavity is used to return cooling medium. The flow path of the cooling medium is more reasonable, and the cooling effect on the stator winding 12 and PEU13 is better. The third flow channel section 1121 is formed in the second radial cylinder and communicates with the second flow channel section 1115, which increases the length of the return flow channel in the stator housing 11 to improve the cooling effect on the stator housing 11.

[0094] According to some embodiments of this application, the stator winding 12 and PEU13 are arranged sequentially along the axial direction in the accommodating cavity, or the stator winding 12 and PEU13 overlap at least partially along the radial direction in the accommodating cavity.

[0095] Specifically, such as Figure 1 and Figure 2 As shown, in the first embodiment of this application, the stator winding 12 and PEU13 are arranged radially overlapping within the accommodating cavity, as follows: Figure 3 and Figure 4 As shown, in the second embodiment of this application, the stator winding 12 and PEU13 are radially overlapped within the accommodating cavity, as... Figure 5 and Figure 6As shown, in the third embodiment of this application, the stator winding 12 and PEU13 are arranged sequentially along the axial direction within the accommodating cavity.

[0096] It is understood that in the first embodiment, the space inside the cavity can be fully utilized to improve the space occupied by the motor 100. In the second and third embodiments, the stator housing 11 has a certain gap in the axial direction, and the medium pump 15 can be set in the gap, which can also improve the space occupied by the motor 100. That is, the space occupied by the hollow part of the stator winding 12 can be fully utilized to improve the space occupied by the motor 100.

[0097] It should be noted that, due to the difference in the arrangement of stator winding 12 and PEU13, the return flow channels in the first, second, and third embodiments have slight differences. In the first embodiment, the first flow channel section 1112 has a first outlet and a second outlet, with the first outlet corresponding to stator winding 12 and the second outlet corresponding to PEU13. The second flow channel section 1115 has a first inlet, a second inlet, and a third outlet, with the first inlet corresponding to stator winding 12, the second inlet corresponding to PEU13, and the third outlet connected to the third flow channel section 1121. In the second embodiment, the first flow channel section 1112 has a first outlet, corresponding to stator winding 12, and the second flow channel section 1115 includes: The first sub-flow channel section has a first inlet and a second outlet. The first inlet is disposed corresponding to the stator winding 12, and the second outlet is radially opposite to PEU13. The second sub-flow channel section has a second inlet and a third outlet. The second inlet is axially opposite to PEU13, and the third outlet is connected to the third flow channel section 1121. In the third embodiment, the first flow channel section 1112 has a first outlet, which is disposed corresponding to the stator winding 12. The cooling medium flowing out of the first outlet flows sequentially through the stator winding 12 and PEU13. The second flow channel section 1115 includes a first inlet and a second outlet. The first inlet corresponds to the stator winding 12 and PEU13, and the second outlet is connected to the third flow channel section 1121.

[0098] It is understood that in the first embodiment, the media pump 15 is located outside the accommodating cavity, while in the second and third embodiments, at least a portion of the media pump 15 is located inside the accommodating cavity.

[0099] Combination Figure 1 , Figure 3 as well as Figure 5As shown, according to some embodiments of this application, the rotor housing 21 of the rotor assembly 20 has a third housing section 211 sleeved on the first housing section 111 and a fourth housing section 212 sleeved on the second housing section 112. The rotor 22 is disposed inside the third housing section 211, and the impeller 23 is disposed on the fourth housing section 212. Bearings 30 are disposed between the first housing section 111 and the third housing section 211, and between the second housing section 112 and the fourth housing section 212.

[0100] Therefore, the bearings 30 between the first shell section 111 and the third shell section 211, and between the second shell section 112 and the fourth shell section 212, can reduce the friction between the rotor assembly 20 and the stator assembly 10, making the rotation of the rotor assembly 20 smoother. An impeller 23 is provided on the radially outer side of the fourth shell section 212 so that the impeller 23 can rotate synchronously with the rotor housing 21 and disturb the airflow to achieve air cooling of the stator assembly 10 and the air-cooled shell section 113.

[0101] It should be noted that the first shell section 111 and the second shell section 112 of the stator housing 11 are both enclosed within the rotor housing 21, while the air-cooled shell section 113 of the stator housing 11 is located at least axially outside the rotor housing 21, so that at least a portion of the air-cooled shell section 113 can contact the air for heat exchange.

[0102] like Figure 1 , Figure 3 and Figure 5 As shown, according to some embodiments of this application, the air-cooled shell section 113 is provided with radially extending heat dissipation fins 1131, and the rotor shell 21 further includes: a fifth shell section 213, which is sleeved on the heat dissipation fins 1131, and the fifth shell section 213 is provided with an air outlet 2131 on the side facing the impeller 23, so that the heat dissipation fins 1131 are located upstream of the impeller 23 in the airflow path.

[0103] Specifically, the fifth shell section 213 may include an end plate and a radial plate. The end plate is connected to the fourth shell section 212. A radial plate is provided on the outer periphery of the end plate. The radial plate can provide protection for the heat dissipation fins 1131 on the outside of the heat dissipation fins 1131 to improve the overall structural strength and reliability of the motor 100. An air outlet 2131 is formed on the end plate. The impeller 23 is located downstream of the end plate in the airflow path. When the impeller 23 disturbs the airflow, the airflow can flow through the heat dissipation fins 1131, the air outlet 2131, and the impeller 23 in sequence, so that the heat dissipation fins 1131 are located on the airflow path to achieve enhanced air cooling of the air-cooled shell section 113, realize the combination and linkage of air cooling and liquid cooling, and improve the cooling efficiency and cooling effect inside the stator assembly 10.

[0104] Referring to the accompanying drawings, in this embodiment of the motor 100, the rotor assembly 20 is constructed as an outer rotor and is integrally fitted onto the stator assembly 10. The internal liquid cooling path of the stator assembly 10 is defined by the first flow channel section 1112 on the first shell section 111, the second flow channel section 1115, the third flow channel section 1121 on the second shell section 112, the fourth flow channel section 1132 on the air-cooled shell section 113, the liquid storage chamber 1133, the supply flow channel 141, and the medium pump 15. The air-cooled shell section 113 is located on one axial side of the stator shell 11. The air-cooled shell section 113 is constructed to be exposed outside the rotor shell 21 and can achieve air cooling through the impeller 23 on the rotor shell 21 and its own heat dissipation fins 1131, so as to achieve the combination of liquid cooling and air cooling. The air cooling can be used to reduce the temperature of the cooling medium in the liquid storage chamber 1133 to further enhance the liquid cooling effect and liquid cooling efficiency.

[0105] like Figure 7 As shown, this application provides an electric drive device 1000, including: the motor 100 in the above embodiment.

[0106] It is understood that the electric drive device 1000 referred to in this application is a device that uses a motor 100 as a power source, such as electric ships, electric spacecraft, electric toys, and power tools. Electric vehicles can be pure electric vehicles, hybrid vehicles, or range-extended vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0107] According to the embodiment of this application, the electric drive device 1000 adopts the above-mentioned motor 100, which has higher working stability and reliability, and can improve the working stability and reliability of the electric drive device 1000. In addition, the motor 100 occupies less space, which can reduce the space occupied by the motor 1000 within the electric drive device 1000, reduce the difficulty of arranging the motor 100, and reduce the impact and constraints of the arrangement of the motor 100 on the spatial arrangement of the electric drive device 1000.

[0108] Other configurations and operations of the motor 100 and electric drive device 1000 according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0110] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric motor, characterized in that, include: Stator assembly (10); A rotor assembly (20) is rotatably mounted on the stator assembly (10) relative to the stator assembly (10), and the rotor assembly (20) has an impeller (23). in The stator assembly (10) includes: a stator housing (11), an internal liquid cooling path is formed inside the stator housing (11), and one axial end of the stator housing (11) is formed as an air-cooled shell section (113). A liquid storage chamber (1133) is provided inside the air-cooled shell section (1133). The cooling medium in the liquid storage chamber (1133) is suitable for supplying to the internal liquid cooling path, and the air-cooled shell section (113) is used to cool the cooling medium in the liquid storage chamber (1133). The air-cooled shell section (113) is located on the airflow path disturbed by the impeller (23).

2. The motor according to claim 1, characterized in that, The stator housing (11) is provided with a stator winding (12), a PEU (13), a stator shaft (14) and a medium pump (15). The medium pump (15) and the liquid storage chamber (1133) are located at the two ends of the axial direction of the stator shaft (14). The stator shaft (14), the stator housing (11), the stator winding (12), the PEU (13), the medium pump (15) and the liquid storage chamber (1133) define the internal liquid cooling path.

3. The motor according to claim 2, characterized in that, A supply channel (141) is provided inside the stator shaft (14), and a return channel is provided on the stator housing (11). One end of the supply channel (141) is connected to the liquid storage chamber (1133), and the other end of the supply channel (141) is connected to the liquid inlet of the medium pump (15). One end of the return channel is connected to the liquid outlet of the medium pump (15), and the other end of the return channel is connected to the liquid storage chamber (1133).

4. The motor according to claim 3, characterized in that, The stator shaft (14) is constructed as a hollow shaft, and the inner hole of the stator shaft (14) is formed as the supply flow channel (141), or a return pipe (142) is provided in the inner hole, and the return pipe (142) defines the supply flow channel (141).

5. The motor according to claim 3, characterized in that, The supply channel (141) extends to the side wall of the liquid storage chamber (1133) away from the medium pump (15).

6. The motor according to claim 3, characterized in that, The stator housing (11) includes: a first housing section (111), the first housing section (111) having a receiving cavity for accommodating the stator winding (12) and the PEU (13), a first flow channel section (1112) being provided inside the first housing section (111), one end of the first flow channel section (1112) being connected to the outlet of the medium pump (15), and the other end of the first flow channel section (1112) supplying cooling medium to the receiving cavity.

7. The motor according to claim 6, characterized in that, The stator housing (11) further includes: a second housing section (112), the second housing section (112) being located between the air-cooled housing section (113) and the first housing section (111), the first housing section (111) further including: a second flow channel section (1115), the second housing section (112) having a third flow channel section (1121), one end of the second flow channel section (1115) communicating with the accommodating cavity, the other end of the second flow channel section (1115) communicating with the third flow channel section (1121), and the other end of the third flow channel section (1121) communicating with the liquid storage cavity (1133).

8. The motor according to claim 7, characterized in that, The air-cooled shell section (113) has a fourth flow channel section (1132), one end of which is connected to the third flow channel section (1121), and the other end of which is connected to the liquid storage chamber (1133).

9. The motor according to claim 7, characterized in that, The first shell section (111) includes a first end plate (1111), a second end plate (1114) disposed opposite each other in the axial direction, and a first radial cylinder (1113) extending in the radial direction. The first end plate (1111), the second end plate (1114) and the first radial cylinder (1113) define the receiving cavity. A first flow channel section (1112) is provided in the first end plate (1111), and a second flow channel section (1115) is provided in the second end plate (1114). The second shell section (112) includes a second radial cylinder connected to the second end plate (1114), and the third flow channel section (1121) is located inside the second radial cylinder.

10. The motor according to claim 7, characterized in that, The stator winding (12) and the PEU (13) are arranged sequentially along the axial direction in the cavity, or the stator winding (12) and the PEU (13) overlap at least partially in the radial direction in the cavity.

11. The motor according to claim 10, characterized in that, The medium pump (15) is located outside the accommodating cavity, or at least a portion of the medium pump (15) is located inside the accommodating cavity.

12. The motor according to claim 7, characterized in that, The rotor housing (21) of the rotor assembly (20) has a third housing section (211) sleeved on the first housing section (111) and a fourth housing section (212) sleeved on the second housing section (112). A rotor (22) is disposed inside the third housing section (211), and an impeller (23) is disposed on the fourth housing section (212). Bearings (30) are disposed between the first housing section (111) and the third housing section (211), and between the second housing section (112) and the fourth housing section (212).

13. The motor according to claim 12, characterized in that, The air-cooled shell section (113) is provided with radially extending heat dissipation fins (1131). The rotor shell (21) further includes a fifth shell section (213), which is sleeved on the heat dissipation fins (1131). The fifth shell section (213) is provided with an air outlet (2131) on the side facing the impeller (23), so that the heat dissipation fins (1131) are located upstream of the impeller (23) in the airflow path.

14. An electrically driven device, characterized in that, include: The motor according to any one of claims 1-13.

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