Rotor assembly, motor and electric equipment

Abstract

The invention relates to the technical field of motor manufacturing, and discloses a rotor assembly, a motor and electric equipment, the rotor assembly comprises a rotating shaft and a rotor core, the rotating shaft is internally provided with a first liquid inlet channel, and the rotor core sleeves the rotating shaft; the rotor core comprises a lamination group, the lamination group is internally provided with a first cooling channel, the first cooling channel is communicated with the first liquid inlet channel, the first cooling channel comprises a first channel and a second channel which are communicated, and the extension direction of the first channel is not parallel to the extension direction of the second channel. According to the rotor assembly, the motor and the electric equipment provided by the invention, the problem of poor cooling effect of the rotor assembly in related technologies can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of motor manufacturing, and in particular to a rotor assembly, a motor and an electrical device. Background Art

[0002] As a device that converts electrical energy into mechanical energy, the motor mainly uses the rotating magnetic field generated by the stator assembly to act on the rotor assembly to form a magneto-electrical rotation torque, causing the rotor assembly to rotate. With the rapid development of technology, motors are widely used in various fields, such as various electrical equipment, such as vehicles.

[0003] In the related art, heat is generated during the operation of the motor, including the heat generated by the rotor assembly, so the rotor assembly needs to be cooled. Traditional methods include cooling by weight-reducing holes or cooling by passing coolant into the rotating shaft of the rotor assembly. Among them, when passing coolant into the rotating shaft of the rotor assembly for cooling, the coolant enters the rotor core of the rotor assembly through the rotating shaft and flows out of the rotor core along the axial direction of the rotor assembly, but this method has a poor cooling effect. Summary of the invention

[0004] The present application provides a rotor assembly, a motor and an electrical device, which can improve the problem of poor cooling effect of the rotor assembly in the related art.

[0005] In a first aspect, an embodiment of the present application provides a rotor assembly, comprising a rotating shaft and a rotor core, wherein a first liquid inlet channel is arranged inside the rotating shaft, and the rotor core is sleeved on the rotating shaft; the rotor core comprises a lamination group, wherein a first cooling channel is arranged inside the lamination group, the first cooling channel is connected with the first liquid inlet channel, the first cooling channel comprises a first channel and a second channel which are connected, and an extension direction of the first channel is not parallel to an extension direction of the second channel.

[0006] In some embodiments, the extension direction of the first channel is perpendicular to the axis of the rotating shaft, and the extension direction of the second channel is parallel to the axis of the rotating shaft.

[0007] In some embodiments, the rotor core further includes a magnetic steel, which is disposed inside the rotor core, and at least a portion of the magnetic steel is located in the first cooling channel.

[0008] In some embodiments, the lamination group includes a first lamination and a second lamination arranged in a stacked manner, the first lamination is provided with a first connecting portion, the first channel includes at least a portion of the first connecting portion, and the first connecting portion is connected to the first liquid inlet channel; the second lamination is provided with a second connecting portion, the second channel includes at least a portion of the second connecting portion, and the second connecting portion is connected to the first connecting portion.

[0009] In some embodiments, the lamination group further includes a plurality of third laminations, the plurality of third laminations are stacked, the third laminations are provided with a third connecting portion, the first channel includes at least a portion of the third connecting portion, and the third connecting portion of one of the third laminations is connected to the third connecting portion of another third lamination adjacent to the current third lamination.

[0010] In a second aspect, an embodiment of the present application provides a motor, comprising:

[0011] stator assembly;

[0012] According to the rotor assembly of the first aspect, the rotor assembly is rotatably disposed inside the stator assembly.

[0013] In some embodiments, the stator assembly includes a stator winding, a first cooling tube and a second cooling tube, the first cooling tube is arranged on the inner side of the stator winding, and the second cooling tube is arranged on the outer side of the stator winding.

[0014] In some embodiments, the stator assembly further includes a stator core, the stator core is connected to the stator winding, a second liquid inlet channel is provided inside the stator core, and the first cooling tube and the second cooling tube are both connected to the second liquid inlet channel.

[0015] In some embodiments, the rotor core further includes a dynamic balancing plate disposed at the end of the lamination stack, and a groove is provided on the outer circumferential surface of the dynamic balancing plate; one end of the first cooling tube extends to the end of the stator winding and corresponds to the groove.

[0016] In a third aspect, an embodiment of the present application provides an electrical device, wherein the electrical device includes the motor as described in the second aspect.

[0017] The rotor assembly provided by the embodiment of the present application has the beneficial effect that: since a first liquid inlet channel is provided in the rotating shaft, a first cooling channel is provided inside the lamination group of the rotor core, the first cooling channel is connected to the first liquid inlet channel, and the first cooling channel includes a first channel and a second channel that are connected, so when the coolant is introduced into the first cooling channel in the lamination group through the first liquid inlet channel in the rotating shaft, the coolant can flow in the first channel and the second channel respectively. Since the extension direction of the first channel is not parallel to the extension direction of the second channel, the flow direction of the coolant in the first channel and the flow direction of the coolant in the second channel are not parallel, so the coolant in the first cooling channel can flow in the extension direction of the first channel and the extension direction of the second channel at the same time, increasing the flow path of the coolant, so that it can better exchange heat with the rotor core and improve the cooling effect of the rotor assembly.

[0018] The beneficial effects of the motor provided in the present application compared with the prior art and the beneficial effects of the electrical equipment provided in the present application compared with the prior art can all be referred to the description of the beneficial effects of the rotor assembly provided in the present application compared with the prior art, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 is a schematic diagram of the structure of a motor in one of the embodiments of the present application;

[0021] Figure 2 yes Figure 1 A top view of the motor shown;

[0022] Figure 3 yes Figure 2 The cross-sectional view of the motor shown is along the AA direction;

[0023] Figure 4 yes Figure 3 A schematic diagram of the structure of the rotor assembly in the motor shown;

[0024] Figure 5 yes Figure 4 A schematic diagram of a liquid outlet channel and a portion of a first cooling channel in a rotor assembly shown;

[0025] Figure 6 yes Figure 4 A schematic diagram of a liquid outlet channel and a first cooling channel in a rotor assembly shown;

[0026] Figure 7 yes Figure 4 A schematic diagram of the structure of the lamination stack and magnetic steel in the rotor assembly shown;

[0027] Figure 8 yes Figure 3 A schematic diagram of the structure of a stator assembly in the motor shown;

[0028] Fig. 9 yes Figure 8 A top view of the stator assembly is shown;

[0029] Fig.10 yes Fig. 9 A cross-sectional view of the stator assembly shown along the BB direction;

[0030] Fig.11 yes Fig.10 A partial enlarged view of the K in the middle;

[0031] Fig.12 yes Fig. 9 A cross-sectional view of the stator assembly shown along the CC direction;

[0032] Fig.13 yes Fig.12 A partial enlarged view of the L in the middle;

[0033] Fig.14 yes Fig.10 A schematic structural diagram of a first cooling tube and a second cooling tube in a stator assembly shown;

[0034] Fig.15 yes Fig.10 A schematic diagram of the second liquid inlet channel and the second cooling channel in the stator assembly is shown.

[0035] The meanings of the marks in the figure are:

[0036] 100. Motor;

[0037] 10. Rotor assembly;

[0038] 11. rotating shaft; 111. first liquid inlet channel; 112. through hole; 12. rotor core; 120. first cooling channel; 1201. first channel; 1202. second channel; 121. lamination stack; 1211. first lamination; 12111. first connecting portion; 1212. second lamination; 12121. second connecting portion; 1213. third lamination; 12131. third connecting portion;

[0039] 122, magnetic steel; 123, dynamic balance plate; 1230, liquid outlet channel; 1231, groove;

[0040] 20. Stator assembly;

[0041] 21. stator winding; 22. first cooling pipe; 220. second cooling channel; 221. first notch; 23. second cooling pipe; 230. third cooling channel; 231. second notch; 24. stator core; 2401. stator lamination; 2402. first stator connecting part; 2403. second stator connecting part; 241. second liquid inlet channel; 242. annular groove;

[0042] 30. Shell assembly;

[0043] 301, accommodating chamber; 302, main channel; 303, liquid outlet; 31, main shell; 32, end cover. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0045] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] References to "one embodiment", "some embodiments" or "an embodiment" described in the specification of this application mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some other embodiments", "in some other embodiments", etc., which appear at different places in this specification, do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. In addition, in one or more embodiments, particular features, structures or characteristics may be combined in any suitable manner.

[0048] In order to illustrate the technical solution of the present application, a description is given below with reference to specific drawings and embodiments.

[0049] As a device that converts electrical energy into mechanical energy, the motor mainly uses the rotating magnetic field generated by the stator assembly to act on the rotor assembly to form a magneto-electrical rotation torque, causing the rotor assembly to rotate. With the rapid development of technology, motors are widely used in various fields, such as various electrical equipment, such as vehicles.

[0050] In the related art, heat is generated during the operation of the motor, including the heat generated by the rotor assembly, so the rotor assembly needs to be cooled. Traditional methods include cooling by weight-reducing holes or cooling by passing coolant into the rotating shaft of the rotor assembly. Among them, when passing coolant into the rotating shaft of the rotor assembly for cooling, the coolant enters the rotor core of the rotor assembly through the rotating shaft and flows out of the rotor core along the axial direction of the rotor assembly, but this method has a poor cooling effect.

[0051] In view of this, the present application provides a rotor assembly, a motor and an electrical equipment. Since a first liquid inlet channel is provided in the rotating shaft, a first cooling channel is provided inside the lamination group of the rotor core, the first cooling channel is connected to the first liquid inlet channel, and the first cooling channel includes a first channel and a second channel that are connected. Therefore, when coolant is introduced into the first cooling channel in the lamination group through the first liquid inlet channel in the rotating shaft, the coolant can flow in the first channel and the second channel respectively.

[0052] Furthermore, since the extension direction of the first channel is not parallel to the extension direction of the second channel, the flow direction of the coolant in the first channel and the flow in the second channel are not parallel. Therefore, the coolant in the first cooling channel can flow in the extension direction of the first channel and the extension direction of the second channel at the same time, thereby increasing the coolant flow path, thereby enabling better heat exchange with the rotor core and improving the cooling effect of the rotor assembly.

[0053] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 is a schematic diagram of the structure of a motor 100 in one embodiment of the present application. Figure 2 yes Figure 1 The top view of the motor 100 is shown. Figure 3 yes Figure 2 The motor 100 is shown in a cross-sectional view along the AA direction.

[0054] In a first aspect, an embodiment of the present application provides a rotor assembly 10 including a rotating shaft 11 and a rotor core 12 . A first liquid inlet channel 111 is disposed in the rotating shaft 11 , and the rotor core 12 is sleeved on the rotating shaft 11 .

[0055] Please refer to Figure 4 , Figure 5 and Figure 6 , Figure 4 yes Figure 3 The schematic structural diagram of the rotor assembly 10 in the motor 100 is shown in FIG. Figure 5 yes Figure 4 The schematic diagram of the liquid outlet channel 1230 and a part of the first cooling channel 120 in the rotor assembly 10 is shown. Figure 6 yes Figure 4 A schematic diagram of the liquid outlet channel 1230 and the first cooling channel 120 in the rotor assembly 10 is shown.

[0056] The rotor core 12 includes a lamination group 121, and a first cooling channel 120 is arranged inside the lamination group 121. The first cooling channel 120 is connected to the first liquid inlet channel 111. The first cooling channel 120 includes a first channel 1201 and a second channel 1202 that are connected. The extension direction of the first channel 1201 is not parallel to the extension direction of the second channel 1202.

[0057] As an example, the rotor assembly 10 can be used in the motor 100, which also includes a housing assembly 30 and a stator assembly 20. The housing assembly 30 is provided with a accommodating cavity 301. The rotor assembly 10 and the stator assembly 20 are both arranged in the accommodating cavity 301. The rotor assembly 10 is rotatably arranged inside the stator assembly 20.

[0058] Under the action of the stator assembly 20, the rotating shaft 11 of the rotor assembly 10 can rotate together with the rotor core 12. The end of the rotating shaft 11 can extend to the outside of the housing assembly 30 for connection with other components. The first liquid inlet channel 111 can be set at one end or both ends of the rotating shaft 11. The shape of the first liquid inlet channel 111 can be a regular shape, such as a cylindrical, prismatic or rectangular shape, or other irregular shapes. The first liquid inlet channel 111 can have an opening formed at the end of the rotating shaft 11 to facilitate the introduction of coolant into the first liquid inlet channel 111. The coolant can be cooling oil or cooling water.

[0059] The first liquid inlet channel 111 may be provided with a through hole 112, and the first cooling channel 120 is connected to the first liquid inlet channel 111 through the through hole 112, or other structural forms may be used to connect the first cooling channel 120 to the first liquid inlet channel 111. The coolant may enter the first cooling channel 120 through the first liquid inlet channel 111, and flow in the first channel 1201 and the second channel 1202, respectively.

[0060] The coolant may first flow into the first channel 1201 from the first liquid inlet channel 111 and then flow into the second channel 1202 from the first channel 1201 , or may flow into the first channel 1201 and the second channel 1202 from the first liquid inlet channel 111 respectively.

[0061] The extension direction of the first channel 1201 is not parallel to the extension direction of the second channel 1202 , that is, the extension direction of the first channel 1201 is perpendicular to or oblique to the extension direction of the second channel 1202 .

[0062] The extending direction of the first channel 1201 may refer to the direction in which the flow path of the coolant is longest when it flows in the first channel 1201, and the extending direction of the second channel 1202 may refer to the direction in which the flow path of the coolant is longest when it flows in the second channel 1202. The shape of the first channel 1201 and the shape of the second channel 1202 may be regular shapes, such as arc, cylinder, prism or cuboid, etc., or other irregular shapes. A plurality of the first channel 1201 and the second channel 1202 may be provided.

[0063] For example, the first channel 1201 may be in the shape of an elongated strip, and the extending direction of the first channel 1201 here refers to the length direction of the first channel 1201 .

[0064] From the above, it can be seen that the rotor assembly 10 provided in the embodiment of the present application has a first liquid inlet channel 111 provided in the rotating shaft 11, and a first cooling channel 120 is provided inside the lamination group 121 of the rotor core 12. The first cooling channel 120 is connected to the first liquid inlet channel 111, and the first cooling channel 120 includes a first channel 1201 and a second channel 1202 that are connected. Therefore, when the coolant is introduced into the first cooling channel 120 in the lamination group 121 through the first liquid inlet channel 111 in the rotating shaft 11, the coolant can flow in the first channel 1201 and the second channel 1202 respectively.

[0065] Furthermore, since the extension direction of the first channel 1201 is not parallel to the extension direction of the second channel 1202, the flow direction of the coolant in the first channel 1201 and the flow in the second channel 1202 are not parallel. Therefore, the coolant in the first cooling channel 120 can flow in the extension direction of the first channel 1201 and the extension direction of the second channel 1202 at the same time, thereby increasing the coolant flow path, thereby enabling better heat exchange with the rotor core 12, improving the cooling efficiency, and enhancing the cooling effect of the rotor assembly 10.

[0066] Please refer to Figures 1 to 5 In this embodiment, the extension direction of the first channel 1201 is perpendicular to the axis of the rotating shaft 11 , and the extension direction of the second channel 1202 is parallel to the axis of the rotating shaft 11 .

[0067] By adopting the above solution, the extension direction of the first channel 1201 and the extension direction of the second channel 1202 can be determined more accurately with reference to the axis of the rotating shaft 11, so that the first channel 1201 and the second channel 1202 can be manufactured more conveniently.

[0068] It can be understood that the extension direction of the first channel 1201 can be along the radial direction or the circumferential direction of the rotating shaft 11 .

[0069] It can also be understood that in actual applications, a certain angle deviation can be allowed for the "vertical" setting. Based on this, in the embodiment of the present application, the range of "vertical" can include a certain degree of fluctuation range around 90°, for example, it can be a range of 90°±5°. In actual applications, a certain angle deviation can be allowed for the "parallel" setting. Based on this, in the embodiment of the present application, the range of "parallel" can include a certain degree of fluctuation range around 0°, for example, it can be a range of 0°±5°.

[0070] It should be noted that a plurality of the first channel 1201 and the second channel 1202 may be provided. The first liquid inlet channel 111 may be located between two ends of the lamination stack 121 , and the first cooling channel 120 extends to two ends of the lamination stack 121 , respectively.

[0071] For example, please refer to Figure 5 , Figure 5 The direction indicated by the dashed arrow is the direction of coolant flow. The coolant can flow from one of the first channels 1201 to the next second channel 1202, and then continue to flow to another first channel 1201. The coolant continues to flow in this way. The flow path of the coolant is longer, which can better exchange heat with the rotor core 12, thereby improving the cooling effect of the rotor assembly 10.

[0072] Please refer to Figure 6 Optionally, a plurality of first cooling channels 120 are provided, and the plurality of first cooling channels 120 are arranged around the rotating shaft 11 .

[0073] Such an arrangement can increase the flow path of the coolant, thereby enabling the coolant to better exchange heat with the rotor core 12 , thereby improving the cooling effect of the rotor assembly 10 .

[0074] For example, Figure 5 A first cooling channel 120 is shown in FIG. Figure 6 Six first cooling channels 120 are shown.

[0075] It can be understood that the plurality of first cooling channels 120 are all connected to the first liquid inlet channel 111 .

[0076] For example, the rotating shaft 11 is provided with a plurality of through holes 112 , and a first cooling channel 120 is connected to a first liquid inlet channel 111 through at least one through hole 112 .

[0077] Please refer to Figures 1 to 7 , Figure 7 yes Figure 4The structure diagram of the lamination stack 121 and the magnetic steel 122 in the rotor assembly 10 is shown.

[0078] The rotor core 12 further includes a magnetic steel 122 . The magnetic steel 122 is disposed inside the rotor core 12 , and at least a portion of the magnetic steel 122 is located in the first cooling channel 120 .

[0079] By adopting the above solution, the magnetic steel 122 can be directly in contact with the coolant in the first cooling channel 120 , so as to perform sufficient heat exchange and improve the cooling effect of the rotor assembly 10 .

[0080] It is understandable that a plurality of magnetic steels 122 may be provided.

[0081] Optionally, a portion of the magnetic steel 122 is located in the first channel 1201 , and another portion of the magnetic steel 122 is located in the second channel 1202 .

[0082] Such a configuration allows the magnetic steel 122 to be in direct contact with the coolant in the first channel 1201 for sufficient heat exchange, and also allows the magnetic steel 122 to be in direct contact with the coolant in the second channel 1202 for sufficient heat exchange, thereby further improving the cooling effect of the rotor assembly 10.

[0083] It is understandable that when multiple magnetic steels 122 , first channels 1201 , and second channels 1202 are provided, for the same magnetic steel 122 , a portion thereof is located in the first channel 1201 , and another portion thereof is located in the second channel 1202 .

[0084] In this embodiment, the lamination group 121 includes a first lamination 1211 and a second lamination 1212 which are stacked. The first lamination 1211 is provided with a first connecting portion 12111. The first channel 1201 includes at least a portion of the first connecting portion 12111, and the first connecting portion 12111 is connected to the first liquid inlet channel 111. The second lamination 1212 is provided with a second connecting portion 12121. The second channel 1202 includes at least a portion of the second connecting portion 12121, and the second connecting portion 12121 is connected to the first connecting portion 12111.

[0085] By adopting the above solution, at least part of the first channel 1201 and at least part of the second channel 1202 can be formed by stacking the first laminate 1211 and the second laminate 1212, thereby facilitating the processing of at least part of the first channel 1201 and at least part of the second channel 1202.

[0086] It can be understood that the extension direction of the first connecting portion 12111 may be perpendicular to the axis of the rotating shaft 11 , and the extension direction of the second connecting portion 12121 may be parallel to the axis of the rotating shaft 11 .

[0087] It should be noted that the first connecting portion 12111 and the second connecting portion 12121 may be grooves or holes, etc. A plurality of the first connecting portion 12111 and the second connecting portion 12121 may be provided.

[0088] Optionally, the lamination group 121 also includes a plurality of third laminations 1213, the plurality of third laminations 1213 are stacked, the third laminations 1213 are provided with a third connecting portion 12131, the first channel 1201 includes at least a portion of the third connecting portion 12131, and the third connecting portion 12131 of one third lamination 1213 is connected to the third connecting portion 12131 of another third lamination 1213 adjacent to the current third lamination 1213.

[0089] With such an arrangement, a first channel 1201 having at least a partial stepped shape can be formed by combining a plurality of third laminations 1213, which not only facilitates the processing of at least a portion of the first channel 1201, but also allows the flow path of the coolant in at least a portion of the first channel 1201 to be longer, thereby improving the cooling effect of the rotor assembly 10.

[0090] It should be noted that the first channel 1201 may include a portion of the first communication portion 12111 , a portion of the second communication portion 12121 , and a portion of the third communication portion 12131 . The second channel 1202 may include a portion of the first communication portion 12111 , a portion of the second communication portion 12121 , and a portion of the third communication portion 12131 .

[0091] A portion of the first channel 1201 defined by the third communicating portion 12131 and a portion of the first channel 1201 defined by the first communicating portion 12111 may be connected via the second channel 1202 defined by the second communicating portion 12121 .

[0092] For example, one first laminate 1211 is provided, and multiple second laminates 1212 and third laminates 1213 are provided. The first laminate 1211 is located between two second laminates 1212 , the third laminate 1213 is located between two second laminates 1212 , and a second laminate 1212 is provided between the first laminate 1211 and the third laminate 1213 .

[0093] It should be noted that the magnetic steel 122 can be inserted through at least one of the first connecting portion 12111, the second connecting portion 12121 and the third connecting portion 12131, and the first lamination 1211, the second lamination 1212 and the third lamination 1213 cooperate with each other to form a stepped first cooling channel 120, so that the coolant can flow into different laminations in sequence and cool the side of the magnetic steel 122 along the radial direction of the rotating shaft 11 until all the magnetic steels 122 are cooled. The coolant can cool the side and end faces of the magnetic steel 122, a total of four faces, to improve the cooling efficiency.

[0094] Please refer to Figures 1 to 8 , Figure 8 yes Figure 3 A schematic structural diagram of a stator assembly 20 in a motor 100 is shown.

[0095] In a second aspect, an embodiment of the present application provides a motor 100 , including a stator assembly 20 and a rotor assembly 10 as in the first aspect, wherein the rotor assembly 10 is rotatably disposed inside the stator assembly 20 .

[0096] The motor 100 provided in the embodiment of the present application has a first liquid inlet channel 111 disposed in the rotating shaft 11 of the rotor assembly 10, and a first cooling channel 120 is disposed inside the lamination group 121 of the rotor core 12. The first cooling channel 120 is connected to the first liquid inlet channel 111, and the first cooling channel 120 includes a first channel 1201 and a second channel 1202 that are connected. Therefore, when coolant is introduced into the first cooling channel 120 in the lamination group 121 through the first liquid inlet channel 111 in the rotating shaft 11, the coolant can flow in the first channel 1201 and the second channel 1202 respectively.

[0097] Since the extension direction of the first channel 1201 is not parallel to the extension direction of the second channel 1202, the flow direction of the coolant in the first channel 1201 and the flow in the second channel 1202 are not parallel. Therefore, the coolant in the first cooling channel 120 can flow in the extension direction of the first channel 1201 and the extension direction of the second channel 1202 at the same time, increasing the coolant flow path, so that it can better exchange heat with the rotor core 12, thereby improving the cooling effect of the rotor assembly 10, and further improving the cooling efficiency and heat dissipation performance of the motor 100.

[0098] Please refer to Figures 9 to 15 , Fig. 9 yes Figure 8 A top view of the stator assembly 20 is shown. Fig.10 yes Fig. 9 The cross-sectional view of the stator assembly 20 along the BB direction is shown. Fig.11 yes Fig.10 A partial enlarged view of the K in the middle. Fig.12 yes Fig. 9 The cross-sectional view of the stator assembly 21 along the CC direction is shown. Fig.13 yes Fig.12 A partial enlarged view of the L in the middle. Fig.14 yes Fig.10 The schematic diagram of the structure of the first cooling tube 22 and the second cooling tube 23 in the stator assembly 20 shown in FIG. Fig.15 yes Fig.10 A schematic diagram of the second liquid inlet channel 241 and the second cooling channel 220 in the stator assembly 20 is shown.

[0099] The stator assembly 20 includes a stator winding 21 , a first cooling tube 22 and a second cooling tube 23 . The first cooling tube 22 is arranged on the inner side of the stator winding 21 , and the second cooling tube 23 is arranged on the outer side of the stator winding 21 .

[0100] By adopting the above solution, the cooling liquid can be introduced into the first cooling pipe 22 and the second cooling pipe 23 at the same time to cool the inside and the outside of the stator winding 21 at the same time, thereby improving the cooling efficiency of the motor 100.

[0101] It should be noted that the first cooling tube 22 and the second cooling tube 23 can also function as slot wedges, and can fix the stator winding 21 in the radial direction of the stator winding 21. The enameled wire can be directly applied, and the ends of the first cooling tube 22 and the second cooling tube 23 can be sealed before dripping the paint, which has certain process feasibility.

[0102] Optionally, the extending direction of the first cooling tube 22 is parallel to the axis of the stator winding 21 ; and / or the extending direction of the second cooling tube 23 is parallel to the axis of the stator winding 21 .

[0103] With such configuration, the positions of the first cooling tube 22 and the second cooling tube 23 can be arranged more conveniently with reference to the axis of the stator winding 21 .

[0104] It should be noted that the axis of the stator winding 21 may be colinear with the axis of the rotating shaft 11 .

[0105] In order to improve the cooling effect of the first cooling tube 22 and the second cooling tube 23, optionally, a plurality of first cooling tubes 22 are provided, and the plurality of first cooling tubes 22 are spaced apart around the axis of the stator winding 21; and / or a plurality of second cooling tubes 23 are provided, and the plurality of second cooling tubes 23 are spaced apart around the axis of the stator winding 21.

[0106] With such an arrangement, the stator winding 21 can be cooled simultaneously by the coolant in the plurality of first cooling tubes 22 and the coolant in the plurality of second cooling tubes 23 , thereby improving the cooling effect.

[0107] In this embodiment, the stator assembly 20 also includes a stator core 24 , which is connected to the stator winding 21 . A second liquid inlet channel 241 is provided inside the stator core 24 , and the first cooling tube 22 and the second cooling tube 23 are both connected to the second liquid inlet channel 241 .

[0108] By adopting the above solution, the coolant can be introduced into the first cooling tube 22 and the second cooling tube 23 through the second liquid inlet channel 241 at the same time, which is simple and convenient.

[0109] Optionally, the second liquid inlet channel 241 is disposed between two ends of the stator core 24 .

[0110] With such arrangement, when coolant is simultaneously introduced into the first cooling tube 22 and the second cooling tube 23 through the second liquid inlet channel 241, the coolant can flow to the two ends of the stator core 24 respectively, so that the coolant in the first cooling tube 22 and the coolant in the second cooling tube 23 can better absorb the heat of the stator winding 21 and the stator core 24.

[0111] Optionally, a plurality of second liquid inlet channels 241 are provided, one second liquid inlet channel 241 is connected to at least one first cooling tube 22 , the stator core 24 is further provided with an annular groove 242 , and the plurality of second liquid inlet channels 241 are all connected to the annular groove 242 .

[0112] With such arrangement, the coolant only needs to be passed into the annular groove 242 , and then the coolant can enter all the first cooling tubes 22 through the annular groove 242 , which is simple and convenient.

[0113] It can be understood that one second liquid inlet channel 241 is connected to at least one second cooling pipe 23 .

[0114] Optionally, the stator core 24 includes a plurality of stator laminations 2401, and the plurality of stator laminations 2401 are stacked; wherein the stator laminations 2401 are provided with a first stator connecting portion 2402, and the first cooling pipe 22 is connected to the annular groove 242 through the first stator connecting portions 2402 of at least two adjacent stator laminations 2401; and / or, the stator laminations 2401 are provided with a second stator connecting portion 2403, and the second cooling pipe 23 is connected to the annular groove 242 through the second stator connecting portions 2403 of at least two adjacent stator laminations 2401.

[0115] With such an arrangement, the annular groove 242 , the first cooling pipe 22 and the second cooling pipe 23 can be connected more conveniently.

[0116] It should be noted that the annular groove 242 may be provided in the stator lamination 2401. The first stator communication portions 2402 of two adjacent stator laminations 2401 may at least partially overlap to be connected in the axial direction of the stator core 24, wherein the first stator communication portion 2402 of one stator lamination 2401 is connected to the annular groove 242, and the first stator communication portion 2402 of the other stator lamination 2401 is connected to the first cooling pipe 22. The second stator communication portions 2403 of two adjacent stator laminations 2401 may at least partially overlap to be connected in the axial direction of the stator core 24, wherein the second stator communication portion 2403 of one stator lamination 2401 is connected to the annular groove 242, and the second stator communication portion 2403 of the other stator lamination 2401 is connected to the second cooling pipe 23.

[0117] It should also be noted that a first notch 221 can be provided on the first cooling pipe 22 to enable the first stator connecting portion 2402 to be connected to the first cooling pipe 22 ; a second notch 231 can be provided on the second cooling pipe 23 to enable the second stator connecting portion 2403 to be connected to the second cooling pipe 23 .

[0118] In this embodiment, the rotor core 12 also includes a dynamic balancing plate 123 arranged at the end of the lamination group 121, and the outer circumferential surface of the dynamic balancing plate 123 is provided with a groove 1231; one end of the first cooling tube 22 extends to the end of the stator winding 21 and corresponds to the groove 1231.

[0119] With such arrangement, the coolant flowing out of the first cooling tube 22 can be accommodated by the groove 1231 of the dynamic balancing plate 123, and the coolant in the groove 1231 can be thrown onto the stator winding 21 for cooling by utilizing the centrifugal force during the subsequent rotation process, thereby improving the cooling efficiency.

[0120] The end of the lamination stack 121 may be one end or both ends of the lamination stack 121 along the axis direction of the rotating shaft 11. When one first lamination 1211 is provided in the lamination stack 121, and a plurality of second laminations 1212 and third laminations 1213 are provided, the dynamic balancing plate 123 may be connected to the second lamination 1212. The end of the stator winding 21 may be one end or both ends of the stator winding 21 along the axis direction of the stator winding 21.

[0121] It should be noted that a dynamic balancing plate 123 may be provided at both ends of the lamination stack 121. A liquid outlet channel 1230 connected to the first cooling channel 120 may be provided inside the dynamic balancing plate 123. The dynamic balancing plate 123 may also use the centrifugal force during rotation to throw the coolant flowing out of the first cooling channel 120 onto the stator winding 21 for cooling, and the oil ring structure may be eliminated.

[0122] When a plurality of first cooling pipes 22 are provided, a plurality of grooves 1231 may also be provided, and the first cooling pipes 22 and the grooves 1231 may be provided in a one-to-one correspondence.

[0123] Please refer to Fig.15 The first cooling tube 22 and the second cooling tube 23 are both provided with a plurality of them. The first cooling tube 22 has a second cooling channel 220 inside, and the second cooling tube 23 has a third cooling channel 230 inside. The second cooling channel 220 and the third cooling channel 230 are both connected to the second liquid inlet channel 241. The coolant can flow along Fig.15 Flow in the direction indicated by the dashed arrow.

[0124] Please refer to Figure 1 , Figure 2 , Figure 3, Figure 8 and Fig.14 In this embodiment, the motor 100 also includes a housing assembly 30, which is provided with a housing cavity 301, in which the rotor assembly 10 and the stator assembly 20 are both arranged; the housing assembly 30 is also provided with a main channel 302, and at least one of the first liquid inlet channel 111, the first cooling pipe 22 and the second cooling pipe 23 is connected to the main channel 302.

[0125] By adopting the above solution, the coolant can be introduced into at least one of the first liquid inlet channel 111 , the first cooling pipe 22 and the second cooling pipe 23 through the main channel 302 .

[0126] Optionally, the first liquid inlet channel 111 and the annular groove 242 are both connected to the main channel 302 .

[0127] With such an arrangement, the coolant can be introduced into the first liquid inlet channel 111 and the second liquid inlet channel 241 simultaneously through the main channel 302 .

[0128] It should be noted that the coolant flowing out of the liquid outlet channel 1230, the coolant flowing out of the first cooling tube 22 and the coolant flowing out of the second cooling tube 23 can all enter the accommodating cavity 301. The rotating shaft 11 can be rotatably connected to the housing assembly 30 via a bearing.

[0129] In order to conveniently discharge the coolant in the accommodating cavity 301 , the housing assembly 30 is further provided with a liquid outlet 303 , which is in communication with the accommodating cavity 301 .

[0130] With such arrangement, the coolant can be discharged through the liquid outlet hole 303 .

[0131] Optionally, the shell assembly 30 includes a main shell 31 and an end cover 32 , the main shell 31 and the end cover 32 together form a receiving cavity 301 , part of the total channel 302 is provided in the main shell 31 , and part of the total channel 302 is provided in the end cover 32 .

[0132] Such an arrangement makes it easy to place the rotor assembly 10 and the stator assembly 20 in the accommodating cavity 301 .

[0133] In a third aspect, an embodiment of the present application provides an electrical device, and the electrical device includes the motor 100 according to the second aspect.

[0134] In the electrical equipment provided in the embodiment of the present application, a first liquid inlet channel 111 is provided in the rotating shaft 11 of the rotor assembly 10 in the motor 100, and a first cooling channel 120 is provided inside the lamination group 121 of the rotor core 12. The first cooling channel 120 is connected to the first liquid inlet channel 111, and the first cooling channel 120 includes a first channel 1201 and a second channel 1202 that are connected. Therefore, when coolant is introduced into the first cooling channel 120 in the lamination group 121 through the first liquid inlet channel 111 in the rotating shaft 11, the coolant can flow in the first channel 1201 and the second channel 1202 respectively.

[0135] Furthermore, since the extension direction of the first channel 1201 is not parallel to the extension direction of the second channel 1202, the flow direction of the coolant in the first channel 1201 and the flow in the second channel 1202 are not parallel. Therefore, the coolant in the first cooling channel 120 can flow in the extension direction of the first channel 1201 and the extension direction of the second channel 1202 at the same time, thereby increasing the coolant flow path, thereby enabling better heat exchange with the rotor core 12, thereby improving the cooling effect of the rotor assembly 10, and further improving the cooling efficiency and heat dissipation performance of the motor 100, thereby improving the performance of the electrical equipment.

[0136] It can be understood that the electrical equipment provided in the embodiment of the present application may be a vehicle, and the vehicle may also include a battery, a chassis, wheels, a body, etc., which will not be elaborated.

[0137] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A rotor assembly, characterized in that: It includes a rotating shaft and a rotor core, wherein a first liquid inlet channel is arranged in the rotating shaft, and the rotor core is sleeved on the rotating shaft; the rotor core includes a lamination group, wherein a first cooling channel is arranged inside the lamination group, the first cooling channel is connected with the first liquid inlet channel, the first cooling channel includes a first channel and a second channel connected with each other, and an extension direction of the first channel is not parallel to an extension direction of the second channel.

2. The rotor assembly according to claim 1, characterized in that The extending direction of the first channel is perpendicular to the axis of the rotating shaft, and the extending direction of the second channel is parallel to the axis of the rotating shaft.

3. The rotor assembly according to claim 1, characterized in that: The rotor core further includes a magnetic steel, which is arranged inside the rotor core, and at least a portion of the magnetic steel is located in the first cooling channel.

4. The rotor assembly according to any one of claims 1 to 3, characterized in that: The lamination group includes a first lamination and a second lamination arranged in a stacked manner, the first lamination is provided with a first connecting portion, the first channel includes at least a portion of the first connecting portion, and the first connecting portion is connected to the first liquid inlet channel; the second lamination is provided with a second connecting portion, the second channel includes at least a portion of the second connecting portion, and the second connecting portion is connected to the first connecting portion.

5. The rotor assembly according to any one of claims 1 to 3, characterized in that: The lamination group also includes a plurality of third laminations, wherein the plurality of third laminations are stacked and provided with a third connecting portion, and the first channel includes at least a portion of the third connecting portion, wherein the third connecting portion of one of the third laminations is connected to the third connecting portion of another third lamination adjacent to the current third lamination.

6. A motor, characterized in that: include: stator assembly; The rotor assembly according to any one of claims 1 to 5, wherein the rotor assembly is rotatably disposed inside the stator assembly.

7. The motor according to claim 6, characterized in that The stator assembly includes a stator winding, a first cooling pipe and a second cooling pipe, wherein the first cooling pipe is arranged on the inner side of the stator winding, and the second cooling pipe is arranged on the outer side of the stator winding.

8. The motor according to claim 7, characterized in that The stator assembly further includes a stator core, which is connected to the stator winding. A second liquid inlet channel is provided inside the stator core, and the first cooling tube and the second cooling tube are both connected to the second liquid inlet channel.

9. The electric machine according to any one of claims 7 to 8, characterized in that The rotor core further comprises a dynamic balancing plate arranged at the end of the lamination group, and a groove is arranged on the outer circumferential surface of the dynamic balancing plate; one end of the first cooling tube extends to the end of the stator winding and corresponds to the groove.

10. An electrical device, characterized in that: The electrical equipment comprises the motor according to any one of claims 6 to 9.

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