Rotor assembly, motor and vehicle

Abstract

The utility model provides a rotor assembly, a motor and a vehicle. The rotor assembly comprises a rotating shaft, a rotor body, a first end plate and a second end plate. The rotating shaft is provided with a liquid guide channel in the axial direction and provided with a first liquid guide hole communicating with the liquid guide channel. The rotor main body is provided with a first magnetic steel groove and a second magnetic steel groove along the axial direction. The first end plate is located at one end of the rotor body, a first flow guide channel and a second flow guide channel are formed in the first end plate, and the first flow guide channel communicates with the first liquid guide hole and the first magnetic steel groove; the second diversion channel is communicated with the second magnetic steel groove and the outside of the rotor assembly. The second end plate is located at the end, away from the first end plate, of the rotor body and provided with a third flow guide channel, and the third flow guide channel communicates with the first magnetic steel grooves and the second magnetic steel grooves. Cooling liquid flows through the first liquid guide hole, the first flow guide channel, the first magnetic steel groove, the third flow guide channel, the second magnetic steel groove and the second flow guide channel, and the heat dissipation effect on the rotor assembly is good.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a rotor assembly, a motor and a vehicle. Background Art

[0002] When the motor is working, the rotor assembly of the motor will generate a large amount of heat. If the rotor assembly is not cooled in time, it will have a serious impact on the working reliability of the motor.

[0003] The existing rotor assembly is usually provided with a flow path for the circulation of a cooling liquid, and the rotor assembly dissipates heat through the cooling liquid. However, in the flow path design of the existing rotor assembly, the heat dissipation efficiency of the rotor assembly is low. Utility Model Content

[0004] The utility model provides a rotor assembly, a motor and a vehicle to solve the problem of low heat dissipation efficiency of the rotor assembly.

[0005] In the first aspect, the utility model provides a rotor assembly, which includes a rotating shaft, a rotor body, a first end plate and a second end plate. The rotating shaft is provided with a liquid guide channel in the axial direction, and a first liquid guide hole connected to the liquid guide channel is provided on the peripheral side wall of the rotating shaft. The rotor body is sleeved on the rotating shaft, and the rotor body is provided with a first magnetic steel groove and a second magnetic steel groove in the axial direction, the second magnetic steel groove is located on the side of the first magnetic steel groove away from the rotating shaft, and the first magnetic steel groove and the second magnetic steel groove are arranged radially and circumferentially spaced and not connected. The first end plate is sleeved on the rotating shaft and located at one end of the rotor body, and a first guide channel and a second guide channel are provided on the first end plate, the first guide channel connects the first liquid guide hole and the first magnetic steel groove; the second guide channel connects the second magnetic steel groove and the outside of the rotor assembly. The second end plate is sleeved on the rotating shaft and located at one end of the rotor body away from the first end plate, and a third guide channel is provided on the second end plate, and the third guide channel connects the first magnetic steel groove and the second magnetic steel groove.

[0006] In combination with the first aspect, in some implementations of the first aspect, the first magnetic steel slot includes a first slot segment and a second slot segment arranged along the circumferential direction of the rotating shaft, and the first slot segment is close to one end of the rotating shaft and the second slot segment is close to one end of the rotating shaft, and a first air gap channel is formed; the second magnetic steel slot includes a third slot segment and a fourth slot segment arranged along the circumferential direction of the rotating shaft, and the third slot segment is close to one end of the rotating shaft and the fourth slot segment is close to one end of the rotating shaft, and a second air gap channel is formed; the ends of the first slot segment and the second slot segment that are far away from each other are respectively formed with a third air gap Channel, the ends of the third slot section and the fourth slot section that are away from each other are respectively formed with fourth air gap channels; the first guide channel connects the first liquid guide hole and the first air gap channel, the third guide channel connects the first air gap channel and the second air gap channel, and the second guide channel connects the second air gap channel and the outside of the rotor assembly; or, the first guide channel connects the first liquid guide hole and the third air gap channel, the third guide channel connects the third air gap channel and the fourth air gap channel, and the second guide channel connects the fourth air gap channel and the outside of the rotor assembly.

[0007] In combination with the first aspect, in certain implementations of the first aspect, a second liquid guide hole connected to the liquid guide channel is further provided on the circumferential side wall of the rotating shaft, a first drainage channel and a second drainage channel are further provided on the second end plate, and a third drainage channel is further provided on the first end plate, the first drainage channel connects the second liquid guide hole and the first magnetic steel groove, the second drainage channel connects the second magnetic steel groove and the outside of the rotor assembly, and the third drainage channel connects the first magnetic steel groove and the second magnetic steel groove.

[0008] In combination with the first aspect, in some implementations of the first aspect, the first magnetic steel slot includes a first slot segment and a second slot segment arranged along the circumferential direction of the rotating shaft, and an end of the first slot segment close to the rotating shaft and an end of the second slot segment close to the rotating shaft are connected to form a first air gap channel; the second magnetic steel slot includes a third slot segment and a fourth slot segment arranged along the circumferential direction of the rotating shaft, and an end of the third slot segment close to the rotating shaft and an end of the fourth slot segment close to the rotating shaft are connected to form a second air gap channel; the ends of the first slot segment and the second slot segment away from each other are respectively formed with a third An air gap channel, the ends of the third groove section and the fourth groove section that are away from each other are respectively formed with fourth air gap channels; the first guide channel connects the first liquid guide hole and the first air gap channel, the third guide channel connects the first air gap channel and the second air gap channel, and the second guide channel connects the second air gap channel and the outside of the rotor assembly; the first drainage channel connects the second liquid guide hole and the third air gap channel, the third drainage channel connects the third air gap channel and the fourth air gap channel, and the second drainage channel connects the fourth air gap channel and the outside of the rotor assembly.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the first end plate is provided with a first axial hole, the rotating shaft is inserted into the first axial hole, and the first end plate is provided with a first annular groove on the side facing the rotor body, the first annular groove passes through the side wall of the first axial hole and connects the first diversion channel and the first liquid guide hole, and / or the second end plate is provided with a second axial hole, the rotating shaft is inserted into the second axial hole, and the second end plate is provided with a second annular groove on the side facing the rotor body, the second annular groove passes through the side wall of the second axial hole and connects the first diversion channel and the second liquid guide hole.

[0010] In combination with the first aspect, in certain implementations of the first aspect, in one or more of the first guide channel, the second guide channel, the third guide channel, the first drainage channel, the second drainage channel and the third drainage channel, the flow area at the end portion is greater than or equal to the flow area at the middle portion.

[0011] In combination with the first aspect, in some implementations of the first aspect, the number of the first magnetic steel grooves is an integer multiple of the number of the first flow guide channels, and each of the first flow guide channels is connected to at least one of the first magnetic steel grooves.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the rotor body includes a plurality of rotor units arranged along the axial direction of the rotating shaft, each of the rotor units includes a rotor support and a plurality of rotor punchings, the rotor support is sleeved on the rotating shaft, a plurality of the rotor punchings are connected to the rotor support, and at least some of the rotor punchings are detachably connected to the rotor support, and the first magnetic steel slot and the second magnetic steel slot are provided on the rotor punchings.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the rotor bracket includes a bracket body and a plurality of extension arms, the plurality of extension arms are arranged at intervals along the circumferential direction of the rotating shaft on a side of the bracket body away from the rotating shaft, and the rotor punching is installed between any two adjacent extension arms.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the rotor assembly further includes a protective sleeve, which is sleeved on an outer peripheral wall of the rotor body.

[0015] In a second aspect, the utility model provides a motor, comprising a stator assembly and a rotor assembly as described in any one of the above items, wherein the rotor assembly is rotatably disposed in the stator assembly.

[0016] In a third aspect, the utility model provides a vehicle, comprising wheels and the motor as described above, wherein the motor is used to drive the wheels to rotate.

[0017] In the rotor assembly, motor and vehicle provided by the utility model, after the coolant flows into the liquid guide channel, it flows into the first guide channel through the first liquid guide hole, flows from the first guide channel through the opening of the first magnetic steel groove close to the first end plate into the first magnetic steel groove, flows from the opening of the first magnetic steel groove close to the second end plate into the third guide channel, flows from the third guide channel through the opening of the second magnetic steel groove close to the second end plate into the second magnetic steel groove, flows from the opening of the second magnetic steel groove close to the first end plate into the second guide channel, finally flows out from the second guide channel to the outside of the rotor assembly, the coolant can cool the first magnetic steel groove and the second magnetic steel groove on the rotor body at the same time, the coolant has a good heat dissipation effect on the rotor assembly, and improves the heat dissipation efficiency of the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is an exploded view of the rotor assembly provided in the embodiment of the utility model.

[0020] Figure 2 It is a cross-sectional view of a rotor assembly provided in an embodiment of the utility model.

[0021] Figure 3 It is a schematic diagram of the structure of the rotor punching provided in an embodiment of the utility model.

[0022] Figure 4 It is a structural schematic diagram of a rotor bracket provided in an embodiment of the utility model.

[0023] Figure 5 It is a structural schematic diagram of the first type of first end plate provided in an embodiment of the utility model.

[0024] Figure 6 It is a structural schematic diagram of the first type of second end plate provided in an embodiment of the utility model.

[0025] Figure 7 It is a structural schematic diagram of the first heat dissipation flow path provided by an embodiment of the utility model.

[0026] Figure 8 It is a structural schematic diagram of the second first end plate provided in an embodiment of the utility model.

[0027] Fig. 9 It is a structural schematic diagram of a second type of second end plate provided in an embodiment of the utility model.

[0028] Fig.10 It is a structural schematic diagram of the second heat dissipation flow path provided by an embodiment of the utility model.

[0029] Fig.11 It is a structural schematic diagram of the third first end plate provided in an embodiment of the utility model.

[0030] Fig.12 It is a structural schematic diagram of a fourth first end plate provided in an embodiment of the utility model.

[0031] Fig.13 It is a structural schematic diagram of a third type of second end plate provided in an embodiment of the utility model.

[0032] Fig.14 It is a schematic diagram of the structure of the first heat dissipation flow path and the second heat dissipation flow path provided in an embodiment of the utility model.

[0033] Fig.15 It is a structural schematic diagram of a fourth second end plate provided in an embodiment of the utility model.

[0034] Description of main reference numerals: rotor assembly-100; shaft-10; liquid guide channel-101; first liquid guide hole-1011; second liquid guide hole-1012; matching structure-11; rotor body-20; rotor unit-201; rotor bracket-21; bracket body-211; extension arm-212; first clamping portion-2121; mounting hole-213; stop structure-214; groove-215; positioning groove-216; weight reduction hole-217; rotor punching sheet-22 ; first magnetic steel slot-221; first slot section-2211; second slot section-2212; first air gap channel-2213; third air gap channel-2214; second magnetic steel slot-222; third slot section-2221; fourth slot section-2222; second air gap channel-2223; fourth air gap channel-2224; second clamping portion-223; magnetic isolation bridge-224a; magnetic isolation bridge-224b; first end plate-30; first end plate-30a; first end plate-30b; First end plate-30c; first end plate-30d; first flow guide channel-31; first flow channel section-311; first end-3111; second end-3112; second flow channel section-312; third flow channel section-313; fourth flow channel section-314; second flow guide channel-32; third flow guide channel-33; first axial hole-34; first annular groove-35; first limiting structure-361; first stress groove-362; second end plate-40; second end plate-40a; second End plate-40b; second end plate-40c; second end plate-40d; first drainage channel-41; second drainage channel-42; third drainage channel-43; end part-431; middle part-432; second axial hole-44; second annular groove-45; second limiting structure-461; second stress groove-462; first locking member-51; second locking member-52; gasket-53; protective sleeve-60; axial direction-X; radial direction-Y; circumferential direction-Z.

[0035] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Reference to "embodiment" or "implementation method" herein means that the specific features, structures or characteristics described in conjunction with the embodiment or implementation method may be included in at least one embodiment of the utility model. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] It should be noted that the terms in the specification and claims of the present invention and the above-mentioned drawings are only for describing specific embodiments and are not intended to limit the present invention. The terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order. The term "and / or" used in the specification and claims of the present invention refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0039] Please also read Figure 1 and Figure 2 , Figure 1 is an exploded view of a rotor assembly 100 provided in an embodiment of the present utility model. Figure 2 : is a cross-sectional view of the rotor assembly 100 provided in the utility model. The rotor assembly 100 is used to be assembled with the stator assembly to form a motor. The rotor assembly 100 includes a rotating shaft 10, a rotor body 20, a first end plate 30, a second end plate 40, a first locking member 51 and a second locking member 52. The rotor body 20, the first end plate 30, the second end plate 40, the first locking member 51 and the second locking member 52 are all sleeved on the rotating shaft 10. The first end plate 30 is located at one end of the rotor body 20, and the second end plate 40 is located at one end of the rotor body 20 away from the first end plate 30. The first locking member 51 is located at one end of the first end plate 30 away from the rotor body 20. The second locking member 52 is located at one end of the second end plate 40 away from the rotor body 20. The first locking member 51 and the second locking member 52 are respectively used to be fixedly connected to the rotating shaft 10, and are used to press and fix the first end plate 30, the rotor body 20 and the second end plate 40 along the axial direction X of the rotating shaft 10. For the convenience of description, all directions in this application shall be referred to as Figure 1 For reference, the term "axial direction X" refers to a direction parallel to the central axis of the shaft 10, the term "radial direction Y" refers to the radial direction of the shaft 10, and the term "circumferential direction Z" refers to the circumferential direction of the shaft 10. The axial direction X is perpendicular to the radial direction Y.

[0040] In some embodiments, the rotor assembly 100 further includes a gasket 53. Exemplarily, the gasket 53 is disposed between the second locking member 52 and the second end plate 40, and the gasket 53 is used to increase the pressing force of the second locking member 52 on the second end plate 40. In some embodiments, a gasket 53 may be disposed between the first locking member 51 and the first end plate 30, and the gasket 53 is used to increase the pressing force of the first locking member 51 on the first end plate 30. In some embodiments, two gaskets 53 may be provided, and the two gaskets 53 are respectively located between the first locking member 51 and the first end plate 30 and between the second locking member 52 and the second end plate 40.

[0041] Please also read Figure 1 , Figure 2 , Figure 3 as well as Figure 4 , Figure 3 2 is a schematic diagram of the structure of the rotor punching 22 provided in the embodiment of the utility model. Figure 4 : is a schematic diagram of the structure of the rotor bracket 21 provided in an embodiment of the utility model. A liquid conducting channel 101 is provided on the rotating shaft 10 along the axial direction X. A first liquid conducting hole 1011 connected to the liquid conducting channel 101 is provided on the peripheral side wall of the rotating shaft 10. The first liquid conducting hole 1011 can be arranged near the position of the first end plate 30. A first magnetic steel groove 221 and a second magnetic steel groove 222 are provided on the rotor body 20 along the axial direction X of the rotating shaft 10. The first magnetic steel groove 221 and the second magnetic steel groove 222 are arranged through the rotor body 20 along the axial direction X of the rotating shaft 10. The second magnetic steel groove 222 is located on the side of the first magnetic steel groove 221 away from the rotating shaft 10. The first magnetic steel groove 221 and the second magnetic steel groove 222 are arranged at intervals along the radial direction Y of the rotating shaft 10 and the circumferential direction Z of the rotating shaft 10 and are not connected.

[0042] Please also read Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 as well as Figure 7 , Figure 5 is a schematic structural diagram of a first end plate 30a provided in an embodiment of the utility model, Figure 6 4 is a schematic diagram of the structure of the first second end plate 40a provided in an embodiment of the utility model. Figure 7: It is a structural schematic diagram of the first heat dissipation flow path provided by an embodiment of the utility model. A first guide channel 31 and a second guide channel 32 are provided on the first end plate 30a. A third guide channel 43 is provided on the second end plate 40a. The first guide channel 31 connects the first liquid guide hole 1011 and the first magnetic steel groove 221. The second guide channel 32 connects the second magnetic steel groove 222 and the outside of the rotor assembly 100. The outside of the rotor assembly 100 may refer to the gap between the rotor assembly 100 and the stator assembly. The third guide channel 43 connects the first magnetic steel groove 221 and the second magnetic steel groove 222.

[0043] The first liquid guide hole 1011, the first guide channel 31, the first magnetic steel groove 221, the third guide channel 43, the second magnetic steel groove 222 and the second guide channel 32 are connected in sequence and connected to form a first heat dissipation flow path. The coolant flows from the liquid guide channel 101 into the interior of the rotor assembly 100 and flows out from the first heat dissipation flow path to the outside of the rotor assembly 100. Specifically, after the coolant flows into the liquid guide channel 101, it flows into the first guide channel 31 through the first guide hole 1011, flows from the first guide channel 31 into the first magnetic steel groove 221 through the opening of the first magnetic steel groove 221 close to the first end plate 30a, flows from the opening of the first magnetic steel groove 221 close to the second end plate 40a into the third guide channel 43, flows from the third guide channel 43 into the second magnetic steel groove 222 through the opening of the second magnetic steel groove 222 close to the second end plate 40a, flows from the opening of the second magnetic steel groove 222 close to the first end plate 30a into the second guide channel 32, and finally flows out from the second guide channel 32 to the outside of the rotor assembly 100. The coolant flows in the rotor assembly 100 in a generally "S"-shaped flow path. The coolant can cool the first magnetic steel slot 221 and the second magnetic steel slot 222 on the rotor body at the same time. The coolant has a good heat dissipation effect on the rotor assembly 100 , thereby improving the heat dissipation efficiency of the rotor assembly 100 .

[0044] The first magnetic steel slot 221 includes a first slot segment 2211 and a second slot segment 2212 arranged along the circumferential direction Z of the rotating shaft 10. The second magnetic steel slot 222 includes a third slot segment 2221 and a fourth slot segment 2222 arranged along the circumferential direction Z of the rotating shaft 10. Among them, the first magnetic steel slot 221 and the second magnetic steel slot 222 are both roughly arranged in a "V" shape. The first slot segment 2211, the second slot segment 2212, the third slot segment 2221 and the fourth slot segment 2222 are all used to accommodate magnetic steel. In some embodiments, the first magnetic steel slot 221 and the second magnetic steel slot 222 can also be roughly arranged in a "U" shape, a "Λ" shape, etc.

[0045] The first slot section 2211 is connected to one end of the rotating shaft 10 and the second slot section 2212 is connected to one end of the rotating shaft 10, and a first air gap channel 2213 is formed. The third slot section 2221 is connected to one end of the rotating shaft 10 and the fourth slot section 2222 is connected to one end of the rotating shaft 10, and a second air gap channel 2223 is formed. The ends of the first slot section 2211 and the second slot section 2212 that are away from each other are respectively formed with a third air gap channel 2214. The ends of the third slot section 2221 and the fourth slot section 2222 that are away from each other are respectively formed with a fourth air gap channel 2224. In the first first end plate 30a of the present application, the first guide channel 31 connects the first liquid guide hole 1011 and the first air gap channel 2213. The third guide channel 43 connects the first air gap channel 2213 and the second air gap channel 2223. The second guide channel 32 connects the second air gap channel 2223 and the outside of the rotor assembly 100. The first liquid guiding hole 1011 , the first guiding channel 31 , the first air gap channel 2213 , the third guiding channel 43 , the second air gap channel 2223 and the second guiding channel 32 are connected in sequence to form a first heat dissipation flow path.

[0046] Exemplarily, the first guide channel 31 and the second guide channel 32 may be configured as grooves provided on the surface of the first end plate 30a on the side facing the rotor body 20, and the first guide channel 31 and the second guide channel 32 penetrate the surface of the first end plate 30a on the side facing the rotor body 20. In some embodiments, the first guide channel 31 may be configured as a channel provided inside the first end plate 30a, and the first guide channel 31 may be provided with an opening penetrating the surface of the first end plate 30a on the side facing the rotor body 20 at a position corresponding to the first magnetic steel groove 221; and / or, the second guide channel 32 may be configured as a channel provided inside the first end plate 30a, and the second guide channel 32 may be provided with an opening penetrating the surface of the first end plate 30a on the side facing the rotor body 20 at a position corresponding to the second magnetic steel groove 222.

[0047] Exemplarily, the third flow guide channel 43 may be configured as a groove provided on the surface of the second end plate 40 on the side facing the rotor body 20, and the third flow guide channel 43 penetrates the surface of the second end plate 40 on the side facing the rotor body 20. In some embodiments, the third flow guide channel 43 may be configured as a channel provided inside the second end plate 40, and the third flow guide channel 43 is provided with openings penetrating the surface of the second end plate 40 on the side facing the rotor body 20 at positions corresponding to the first magnetic steel groove 221 and the second magnetic steel groove 222, respectively.

[0048] Among them, the number of the first magnetic steel slots 221 and the number of the second magnetic steel slots 222 can be set to multiple respectively. The number of the first magnetic steel slots 221 and the second magnetic steel slots 222 corresponds. The multiple first magnetic steel slots 221 and the multiple second magnetic steel slots 222 are arranged at intervals along the circumferential direction Z of the rotating shaft 10. The two adjacent first magnetic steel slots 221, the two adjacent second magnetic steel slots 222, and the adjacent first magnetic steel slots 221 and the second magnetic steel slots 222 are spaced from each other and not connected, so that when the coolant flows in the first magnetic steel slots 221 and the second magnetic steel slots 222, there will be no cross-flow problem, thereby accurately controlling the flow path of the coolant inside the rotor assembly 100 and improving the heat dissipation efficiency of the rotor assembly 100.

[0049] The number of the first magnetic steel grooves 221 is set to an integer multiple of the first flow guide channel 31 to improve the uniformity of the coolant flowing from the liquid guide channel 101 through the first flow guide channel 31 into the first magnetic steel grooves 221, improve the heat dissipation uniformity of each part of the rotor assembly 100, and improve the heat dissipation effect. For example, the number of the first magnetic steel grooves 221 can be set to 1 times, 2 times, 3 times, etc. of the first flow guide channel 31. Each first flow guide channel 31 is connected to at least one first magnetic steel groove 221. The first flow guide channel 31 can be set to multiple, and the multiple first flow guide channels 31 are evenly spaced and arranged along the circumferential direction Z of the rotating shaft 10 to improve the uniformity of the distribution of the coolant inside the rotor assembly 100, so that the rotor assembly 100 dissipates heat evenly inside and improves the heat dissipation effect. The first magnetic steel grooves 221 can also be set to four, six, eight, etc. The number of the first liquid guide holes 1011 can be the same as the number of the first flow guide channels 31 to improve the uniformity of the distribution of the coolant when it enters the first guide channel 31 from the first liquid guide holes 1011.

[0050] Exemplarily, six first magnetic steel grooves 221 may be provided, and the six first magnetic steel grooves 221 may be arranged evenly spaced along the circumferential direction Z of the rotating shaft 10. The number of first guide channels 31 may be provided, and the three first guide channels 31 may be arranged evenly spaced along the circumferential direction Z of the rotating shaft 10. Each first guide channel 31 is respectively connected to two adjacent first magnetic steel grooves 221. Specifically, the first guide channel 31 includes a first flow channel section 311 and a second flow channel section 312. The first flow channel section 311 has a first end 3111 and a second end 3112 opposite to each other. The first end 3111 is provided close to the rotating shaft 10 and is connected to the first liquid guide hole 1011. The second end 3112 is located on the side of the first end 3111 away from the rotating shaft 10, and is connected to the position of the second flow channel section 312 between the two ends. The opposite ends of the second flow channel section 312 are respectively connected to the two adjacent first magnetic steel grooves 221. The first flow channel section 311 may be provided along a straight extension or a curved extension. The second flow channel section 312 can be extended in a straight line or in a curved shape. Exemplarily, the first flow channel section 311 can be extended in the radial direction Y of the rotating shaft 10. The second flow channel section 312 can be extended in the circumferential direction Z of the rotating shaft 10. The first guide channel 31 is roughly arranged in a "T" shape. The shapes of the cross-sections of the first flow channel section 311 and the second flow channel section 312 include but are not limited to circular, elliptical, triangular, rectangular, regular polygonal, irregular polygonal, special-shaped, etc. In each first guide channel 31, the number of first flow channel sections 311 can be set to one or more. When the first flow channel section 311 is set to multiple, multiple first flow channel sections 311 are connected to the second flow channel section 312.

[0051] In some embodiments, the second flow channel section 312 may be in communication with at least one first magnetic steel groove 221. For example, the number of first magnetic steel grooves 221 in communication with the second flow channel section 312 may be one, two, three, four, etc. Exemplarily, the first flow guide channel 31 may be provided as one, the second flow channel section 312 may be configured as an annular flow channel arranged around the rotating shaft 10, and the second flow channel section 312 is in communication with all first magnetic steel grooves 221. In some embodiments, the number of first flow guide channels 31 may be the same as the number of first magnetic steel grooves 221, and the first flow channel section 311 and the second flow channel section 312 may both be extended along the axial direction Y of the rotating shaft 10.

[0052] The number of the second guide channels 32 is set corresponding to the number of the second magnetic steel slots 222, so that the second guide channels 32 can quickly throw the coolant to the outside of the rotor assembly 100, thereby improving the heat dissipation efficiency of the rotor assembly 100. The opening of the second guide channel 32 communicating with the outside of the rotor assembly 100 can be set in a direction away from the rotating shaft 10. When the rotor assembly 100 rotates, the coolant in the second guide channel 32 can be thrown out to the inner wall of the stator assembly under the centrifugal effect, thereby increasing the outflow speed of the coolant and improving the heat dissipation efficiency. In some embodiments, the opening of the second guide channel 32 communicating with the outside of the rotor assembly 100 can also be oriented in other directions, for example, in a direction toward the first end plate 30a away from the rotor body 20, and the second guide channel 32 is set through the side surface of the first end plate 30a away from the rotor body 20.

[0053] The number of the third guide channels 43 is set corresponding to the number of the first magnetic steel slots 221. Each third guide channel 43 is used to connect a first magnetic steel slot 221 with a second magnetic steel slot 222 located on the side of the first magnetic steel slot 221 away from the rotating shaft 10, so as to avoid the problem of coolant cross-flow between different first magnetic steel slots 221 and different second magnetic steel slots 222, improve the control accuracy of the flow direction of the coolant, and thus improve the heat dissipation effect of the rotor assembly 100.

[0054] The first heat dissipation flow path may be provided in multiple numbers, and the multiple first heat dissipation flow paths are evenly spaced and arranged along the circumferential direction Z of the rotating shaft 10 to improve the uniformity of the distribution of the coolant inside the rotor assembly 100, so that the heat inside the rotor assembly 100 is evenly dissipated, and the heat dissipation effect is improved. The multiple first heat dissipation flow paths are provided independently of each other to avoid the cross-flow of the coolant between different first heat dissipation flow paths, thereby improving the control accuracy of the flow direction of the coolant and improving the heat dissipation effect of the rotor assembly 100. Exemplarily, the first heat dissipation flow paths may be provided in three numbers.

[0055] In some embodiments, in one or more of the first guide channel 31, the second guide channel 32, and the third guide channel 43, the flow area at the end portion is greater than or equal to the flow area at the middle portion. Wherein, the end portion refers to the position at the liquid inlet or the liquid outlet in each channel, and the middle portion refers to the position between the liquid inlet and the liquid outlet in each channel, and the middle portion connects the end portions together. When the coolant flows from the end portion of the channel into the middle portion, the flow rate of the coolant increases, so that the heat dissipation efficiency of the rotor assembly 100 can be improved. Wherein, the end portion of the first guide channel 31 is respectively used to communicate with the first guide hole 1011 and the first magnetic steel groove 221. The end portion of the second guide channel 32 is respectively used to communicate with the second magnetic steel groove 222 and the outside of the rotor assembly 100. The end portion of the third guide channel 43 is respectively used to communicate with the first magnetic steel groove 221 and the second magnetic steel groove 222.

[0056] Exemplarily, the third flow guide channel 43 includes end portions 431 located at opposite ends and a middle portion 432 located between the two ends. The flow areas of the two end portions 431 of the third flow guide channel 43 are both larger than the flow area of ​​the middle portion 432. The third flow guide channel 43 is generally in the shape of an "I". When the coolant flows from the end portions 431 to the middle portion 432, the flow velocity increases to improve the heat dissipation efficiency of the rotor assembly 100. In some embodiments, the third flow guide channel 43 can also be in a water drop shape, a "T" shape, etc.

[0057] Exemplarily, the flow area of ​​the end portion of the second guide channel 32 corresponding to the second magnetic steel groove 222 is larger than the flow area of ​​the middle portion, and the second guide channel 32 is roughly T-shaped. In some embodiments, the second guide channel 32 can also be drop-shaped, I-shaped, etc.

[0058] The first end plate 30a is provided with a first shaft hole 34. The rotating shaft 10 is inserted into the first shaft hole 34. The second end plate 40a is provided with a second shaft hole 44. The rotating shaft 10 is inserted into the second shaft hole 44. In some embodiments, the first end plate 30a is provided with a first annular groove 35 on the side facing the rotor body 20. The first annular groove 35 passes through the side wall of the first shaft hole 34 and connects the first guide channel 31 and the first liquid guide hole 1011. The first annular groove 35 is used to connect at least part of the first guide channel 31 close to the end of the rotating shaft 10. When the coolant flows from the first liquid guide hole 1011 into the first annular groove 35, the first annular groove 35 can guide the coolant to flow along the circumferential direction Z of the rotating shaft 10, and distribute the coolant to the first guide channel 31, so as to improve the uniformity of the distribution of the coolant in different first guide channels 31, thereby improving the heat dissipation uniformity of the rotor assembly 100 and improving the heat dissipation effect.

[0059] In some embodiments, a first limiting structure 361 is provided on the inner side wall of the first shaft hole 34. A matching structure 11 is provided on the rotating shaft 10. The matching structure 11 and the first limiting structure 361 are used to jointly limit the rotation of the first end plate 30a along the circumferential direction Z of the rotating shaft 10, so that the first end plate 30a is fixed relative to the rotating shaft 10. One of the first limiting structure 361 and the matching structure 11 can be configured as a convex key, and the other can be configured as a keyway for accommodating the convex key. Exemplarily, the first limiting structure 361 can be configured as a convex key, and the matching structure 11 can be configured as a keyway, and when the first end plate 30a is installed on the rotating shaft 10, the convex key is accommodated in the keyway. Among them, a first stress groove 362 can also be opened on the inner side wall of the first shaft hole 34, and the first stress groove 362 is located on both sides of the convex key along the circumferential direction Z of the rotating shaft 10, and is adjacent to the convex key. The side wall of the first stress groove 362 and the bottom wall on the side away from the rotating shaft 10 are arranged in a circular arc transition. The first stress groove 362 is used to reduce the stress concentration at the connection between the convex key and the inner side wall of the first shaft hole 34 to avoid cracking. It is understandable that when processing the convex key, there will be a rounded transition between the convex key and the inner side wall of the first shaft hole 34. During assembly, the sharp corner at the notch of the keyway will structurally interfere with the rounded corner, resulting in assembly difficulties. The first stress groove 362 is provided on the first end plate 30a to avoid structural interference between the sharp corner at the notch of the keyway and the first end plate 30a, thereby facilitating the assembly between the first end plate 30a and the rotating shaft 10. In some embodiments, the first limiting structure 361 can also be configured as a keyway, and the matching structure 11 can be configured as a convex key.

[0060] In some embodiments, a second limiting structure 461 is provided on the inner wall of the second shaft hole 44. The second limiting structure 461 is used to cooperate with the matching structure 11 to jointly limit the rotation of the second end plate 40a along the circumferential direction Z of the rotating shaft 10, so that the second end plate 40a is fixed relative to the rotating shaft 10. One of the second limiting structure 461 and the matching structure 11 can be configured as a convex key, and the other can be configured as a keyway for accommodating the convex key. Exemplarily, the second limiting structure 461 can be configured as a convex key, and the matching structure 11 can be configured as a keyway, and when the second end plate 40a is installed on the rotating shaft 10, the convex key is accommodated in the keyway. Among them, a second stress groove 462 can also be opened on the inner side wall of the second shaft hole 44, and the second stress groove 462 is located on both sides of the convex key along the circumferential direction Z of the rotating shaft 10, and is adjacent to the convex key. The side wall of the second stress groove 462 and the bottom wall on the side away from the rotating shaft 10 are arranged in a circular arc transition. The second stress groove 462 is used to reduce stress concentration at the connection between the key and the inner side wall of the second shaft hole 44 and facilitate assembly between the second end plate 40 a and the rotating shaft 10 .

[0061] Please also read Figure 1 , Figure 2 , Figure 3 as well as Figure 4 The rotor body 20 includes a plurality of rotor units 201. The plurality of rotor units 201 are arranged along the axial direction X of the rotating shaft 10. Each rotor unit 201 includes a rotor support 21 and a plurality of rotor punchings 22. The rotor support 21 is sleeved on the rotating shaft 10. The plurality of rotor punchings 22 are connected to the rotor support 21, and at least some of the rotor punchings 22 are detachably connected to the rotor support 21.

[0062] Exemplarily, in the present embodiment, each rotor punching sheet 22 is detachably connected to the rotor support 21. Specifically, the rotor support 21 includes a support body 211 and a plurality of extension arms 212. The plurality of extension arms 212 are arranged at intervals along the circumferential direction Z of the rotating shaft 10 on the side of the support body 211 away from the rotating shaft 10. A rotor punching sheet 22 is installed between any two adjacent extension arms 212. The rotor punching sheet 22 is detachably connected to the support body 211 and / or the extension arm 212. Among them, a first clamping portion 2121 may be provided on the extension arm 212, and a second clamping portion 223 for matching with the first clamping portion 2121 is provided on the rotor punching sheet 22. One of the first clamping portion 2121 and the second clamping portion 223 is configured as a clamping protrusion, and the other is configured as a clamping groove that is clamped and matched with the clamping protrusion. The cross-sectional shapes of the snap-fit ​​protrusion and the snap-fit ​​groove may be, but are not limited to, an "Ω" shape, a "T" shape, a teardrop shape, a trapezoid, a square, and the like.

[0063] The rotor punching 22 is provided with a first magnetic steel slot 221 and a second magnetic steel slot 222. Exemplarily, the number of the first magnetic steel slot 221 and the second magnetic steel slot 222 on each rotor punching 22 is set to one respectively. The number of rotor punchings 22 can be set to six. Among them, the number of rotor punchings 22 can be set according to actual needs, and the utility model does not make specific restrictions. For example, the number of rotor punchings 22 can be set to four, eight, and so on. The extension length of the extension arm 212 can be specifically set according to actual needs, and the utility model does not make specific restrictions. The first guide channel 31 is connected to the first magnetic steel slot 221 on at least one rotor punching 22.

[0064] In this embodiment, the rotor bracket 21 and the rotor punching 22 are modularly designed. When the rotor bracket 21 or the rotor punching 22 is damaged and needs to be replaced and maintained, only the corresponding rotor bracket 21 or the rotor punching 22 needs to be replaced, and the rotor unit 201 does not need to be replaced as a whole, which reduces the maintenance cost of the rotor assembly 100. When the rotor punching 22 is updated, it is not necessary to replace the rotor bracket 21 again, which reduces the investment cost of the mold during production, reduces the difficulty of production and processing, and reduces the production cost of the rotor assembly 100. In some embodiments, the rotor bracket 21 and the rotor punching 22 can be integrally formed.

[0065] The rotor support 21 is provided with a mounting hole 213. The rotating shaft 10 is inserted into the mounting hole 213. A stop structure 214 for cooperating with the matching structure 11 is provided on the inner side wall of the mounting hole 213. The stop structure 214 and the matching structure 11 are used to jointly limit the rotation of the rotor support 21 along the circumferential direction Z of the rotating shaft 10, so that the rotor support 21 is fixed relative to the rotating shaft 10. One of the stop structure 214 and the matching structure 11 can be configured as a convex key, and the other can be configured as a keyway for accommodating the convex key. Exemplarily, the stop structure 214 can be configured as a convex key, and the matching structure 11 can be configured as a keyway, and when the rotor support 21 is installed on the rotating shaft 10, the convex key is accommodated in the keyway. Among them, a groove 215 can also be provided on the inner side wall of the mounting hole 213, and the groove 215 is located on both sides of the convex key along the circumferential direction Z of the rotating shaft 10, and is adjacent to the convex key. The side wall of the groove 215 and the bottom wall on the side away from the rotating shaft 10 are arranged in an arc transition. The groove 215 is used to reduce the stress concentration at the connection between the convex key and the inner side wall of the mounting hole 213, and to facilitate the assembly between the rotor bracket 21 and the rotating shaft 10.

[0066] In this embodiment, a skew angle is set between the multiple rotor units 201 to reduce the cogging torque and back electromotive force harmonics, thereby reducing the noise of the rotor assembly 100 and the motor during operation and improving the NVH performance of the motor. The two adjacent rotor units 201 deflect from each other along the circumferential direction Z of the rotating shaft 10. Among them, the setting positions of the stop structure 214 in the two adjacent rotor brackets 21 are different, so as to realize the skew setting of the rotor bracket 21 when installing the rotor bracket 21. In this embodiment, the skew pole of the rotor unit 201 is converted into the skew pole of the rotor bracket 21, which can simplify the installation process, avoid the problem of incorrect installation of the skew angle during the installation process, and improve the installation efficiency. In addition, the extension arm 212 on the adjacent rotor bracket 21 can also play a role in limiting and fixing the rotor punching 22 along the axial direction X of the rotating shaft 10, thereby improving the overall strength and structural stability of the rotor body 20.

[0067] In some embodiments, a positioning groove 216 is further provided on the side wall of the mounting hole 213. Along the circumferential direction Z of the rotating shaft 10, the distances between the positioning groove 216 and the stop structure 214 in the rotor bracket 21 of at least two rotor units 201 are different. The distance between the positioning groove 216 and the stop structure 214 can be used to distinguish rotor units 201 with different tilting angles, so as to distinguish and classify the rotor units 201 and avoid incorrect assembly of the rotor units 201 and the rotating shaft 10.

[0068] In some embodiments, the rotor bracket 21 is provided with weight-reducing holes 217 to reduce the overall mass of the rotor bracket 21 while ensuring that the rotor bracket 21 has sufficient structural strength, thereby improving the working efficiency of the rotor assembly 100, improving the power density of the motor, and reducing the cost of the rotor assembly 100. The weight-reducing holes 217 may be respectively provided on the bracket body 211 and the extension arm 212. The weight-reducing holes 217 are evenly spaced and arranged along the circumferential direction of the rotating shaft 10 to improve the balance and rotation stability of the rotor assembly 100.

[0069] In some embodiments, the rotor assembly 100 further includes a protective sleeve 60. The protective sleeve 60 is sleeved on the outer peripheral wall of the rotor body 20. The protective sleeve 60 is used to provide a pre-tightening force along the radial direction Y of the rotating shaft 10 to the rotor body 20, improve the connection stability between the rotor punching 22 and the rotor bracket 21, improve the overall strength of the rotor body 20, and avoid the problem of the rotor unit 201 splitting when the rotor assembly 100 rotates at high speed. The protective sleeve 60 can be configured as an insulating non-magnetic protective sleeve, for example, the protective sleeve 60 can be configured as a carbon fiber protective sleeve, a glass fiber protective sleeve, a polyester fiber protective sleeve, a rubber protective sleeve, etc. Among them, the pre-tightening force provided by the protective sleeve 60 can, on the one hand, reduce the thickness of the magnetic isolation bridge 224a located between the third air gap channel 2214 and the outer wall of the rotor punching 22 away from the rotating shaft, and reduce the thickness of the magnetic isolation bridge 224b located between the fourth air gap channel 2224 and the outer wall of the rotor punching 22 away from the rotating shaft. On the other hand, the setting of the center column in the first air gap channel 2213 and the setting of the center column in the second air gap channel 2223 can be cancelled. By thinning the thickness of the magnetic isolation bridge 224a, the thickness of the magnetic isolation bridge 224b and canceling the setting of the center column, the stray loss path of the rotor assembly 100 can be reduced, the leakage magnetic flux can be reduced, the torque, power and maximum speed of the motor can be improved, and the overall mass of the rotor body 20 can be reduced, and the production cost of the rotor assembly 100 can be reduced. In addition, canceling the setting of the center column can also increase the flow area of ​​the first air gap channel 2213 and the second air gap channel 2223, thereby improving the heat dissipation efficiency of the rotor body 20. Among them, the central column in the first air gap channel 2213 is used to separate the magnetic steel in the first slot segment 2211 and the magnetic steel in the second slot segment 2212, and the central column in the second air gap channel 2223 is used to separate the magnetic steel in the third slot segment 2221 and the magnetic steel in the fourth slot segment 2222.

[0070] Please also read Figure 2 , Figure 3 , Figure 4 , Figure 8 , Fig. 9 as well as Fig.10 , Figure 8is a schematic structural diagram of a second first end plate 30b provided in an embodiment of the utility model, Fig. 9 4 is a schematic diagram of the structure of the second second end plate 40b provided in an embodiment of the utility model. Fig.10 It is a structural schematic diagram of the second heat dissipation flow diagram provided by an embodiment of the utility model. The structure of the second first end plate 30b in the present application is similar to that of the first first end plate 30a, except that the first guide channel 31 on the second first end plate 30b is used to connect the third air gap channel 2214 and the first liquid guide hole 1011, and the second guide channel 32 is used to connect the fourth air gap channel 2224 and the outside of the rotor assembly 100. The structure of the second second end plate 40b in the present application is similar to that of the first second end plate 40a, except that the third guide channel 43 on the second second end plate 40b is used to connect the third air gap channel 2214 and the fourth air gap channel 2224.

[0071] Specifically, the first liquid guide hole 1011, the first guide channel 31, the third air gap channel 2214, the third guide channel 43, the fourth air gap channel 2224 and the second guide channel 32 are connected in sequence to form a first heat dissipation flow path. The first heat dissipation flow path is used to dissipate heat on the side of the magnetic steel in the first magnetic steel groove 221 close to the third air gap channel 2214 and the side of the magnetic steel in the second magnetic steel groove 222 close to the fourth air gap channel 2224. The number of first guide channels 31 in the first end plate 30b can be set to six, and each first guide channel 31 is respectively connected to two adjacent third air gap channels 2214 in two adjacent first magnetic steel grooves 221. Exemplarily, the structural shape of the first guide channel 31 in the second first end plate 30b can be similar to the structural shape of the first guide channel 31 in the first first end plate 30a. For example, the first guide channel 31 can be set in a "T" shape. The first heat dissipation flow paths can be set to six, and the six first heat dissipation flow paths are evenly spaced along the circumferential direction Z of the rotating shaft 10 to improve the uniformity of the distribution of the coolant inside the rotor assembly 100, so that the heat inside the rotor assembly 100 is evenly dissipated, thereby improving the heat dissipation effect.

[0072] See also Fig.11 , Fig.11 3 is a schematic diagram of the structure of the third first end plate 30c provided in an embodiment of the utility model. The structure of the third first end plate 30c in the present application is similar to that of the second first end plate 30b, except that the number of the first guide channels 31 in the third first end plate 30c is set to three, and each first guide channel 31 is respectively connected to the third air gap channels 2214 in the three adjacent first magnetic steel slots 221.

[0073] Specifically, the first flow channel 31 includes a first flow channel section 311, a second flow channel section 312, a third flow channel section 313 and a fourth flow channel section 314. The first flow channel section 311 and the third flow channel section 313 are respectively extended along the radial direction Y of the rotating shaft 10. The second flow channel section 312 and the fourth flow channel section 314 are respectively extended along the circumferential direction Z of the rotating shaft 10. The end of the third flow channel section 313 close to the rotating shaft 10 is used to communicate with the first liquid guide hole 1011, and the end away from the rotating shaft 10 is used to connect with the fourth flow channel section 314 at a position between the opposite ends. The first flow channel section 311 and the second flow channel section 312 are respectively provided with two. The opposite ends of the fourth flow channel section 314 are respectively connected to the corresponding first flow channel section 311. The end of each first flow channel section 311 away from the fourth flow channel section 314 is connected to a second flow channel section 312. Each second channel section 312 is used to communicate with two third air gap channels 2214 in two adjacent first magnetic steel slots 221. There are three first heat dissipation channels.

[0074] Please also read Figure 2 , Figure 3 , Figure 4 , Fig.12 , Fig.13 as well as Fig.14 , Fig.12 is a schematic structural diagram of a fourth first end plate 30d provided in an embodiment of the utility model, Fig.13 is a schematic structural diagram of a third second end plate 40c provided in an embodiment of the utility model, Fig.14 It is a schematic diagram of the structure of the first heat dissipation flow path and the second heat dissipation flow path provided by an embodiment of the utility model. The structure of the third second end plate 40c in the present application is similar to the structure of the first second end plate 40a, except that the third second end plate 40c is also provided with a first drainage channel 41 and a second drainage channel 42. A second liquid guide hole 1012 connecting the liquid guide channel 101 is also provided on the peripheral side wall of the rotating shaft 10. The second liquid guide hole 1012 is arranged near the position of the second end plate 40c. The first drainage channel 41 is used to connect the second liquid guide hole 1012 and the first magnetic steel groove 221. The second drainage channel 42 is used to connect the second magnetic steel groove 222 and the outside of the rotor assembly 100. The structure of the fourth first end plate 30d in the present application is similar to the structure of the first first end plate 30a, except that the fourth first end plate 30d is also provided with a third drainage channel 33. The third drainage channel 33 is used to connect the first magnetic steel groove 221 and the second magnetic steel groove 222.

[0075] Specifically, in the first end plate 30d, the first guide channel 31 is used to connect the first liquid guide hole 1011 and the first air gap channel 2213, the second guide channel 32 is used to connect the second air gap channel 2223 and the outside of the rotor assembly 100, and the third guide channel 33 is used to connect the third air gap channel 2214 and the fourth air gap channel 2224. In the second end plate 40c, the first guide channel 41 is used to connect the second liquid guide hole 1012 and the third air gap channel 2214, the second guide channel 42 is used to connect the fourth air gap channel 2224 and the outside of the rotor assembly 100, and the third guide channel 43 is used to connect the first air gap channel 2213 and the second air gap channel 2223.

[0076] The first liquid guide hole 1011, the first guide channel 31, the first air gap channel 2213, the third guide channel 43, the second air gap channel 2223 and the second guide channel 32 are connected in sequence to form a first heat dissipation flow path. The second liquid guide hole 1012, the first guide channel 41, the third air gap channel 2214, the third guide channel 33, the fourth air gap channel 2224 and the second guide channel 42 are connected in sequence to form a second heat dissipation flow path. Exemplarily, there is an integer multiple relationship between the first heat dissipation flow path and the second heat dissipation flow path. For example, the first heat dissipation flow path can be set to three, and the second heat dissipation flow path can be set to six. The second heat dissipation flow path and the first heat dissipation flow path are alternately arranged along the circumferential direction of the rotating shaft 10 to improve the heat dissipation uniformity of the rotor assembly 100 and improve the heat dissipation effect. Among them, the first guide channel 41 can be set to six.

[0077] In the embodiment of the present application, by providing the first heat dissipation flow path and the second heat dissipation flow path in the rotor assembly 100, the first heat dissipation flow path and the second heat dissipation flow path can fully dissipate heat on the opposite sides of the magnetic steel, and can accurately distribute the coolant, thereby improving the working performance and service life of the magnetic steel, and improving the working performance of the rotor assembly 100. The inflow ends of the first heat dissipation flow path and the second heat dissipation flow path are respectively located at the two opposite ends of the rotor body 20, so that the two ends of the rotor body 20 can dissipate heat evenly, improve the heat dissipation effect of the rotor assembly 100, and improve the working reliability of the motor.

[0078] Among them, the structural shape of the first guide channel 41 in the third second end plate 40c can be similar to or the same as the structural shape of the first guide channel 31 in the second first end plate 30b, or similar to the structural shape of the first guide channel 31 in the first first end plate 30a. The structural shape of the first guide channel 41 in the third second end plate 40c can refer to the description of the first guide channel 31 in the second first end plate 30b or the first guide channel 31 in the first first end plate 30a, and will not be described in detail here. The structural shape of the second guide channel 42 in the third second end plate 40c can be similar to or the same as the structural shape of the second guide channel 32 in the second first end plate 30b. The structural shape of the second guide channel 42 in the third second end plate 40c can refer to the description of the second guide channel 32 in the second first end plate 30b, and will not be described in detail here. The structure of the third guide channel 33 in the fourth first end plate 30d may be similar to or identical to the structure of the third guide channel 43 in the second second end plate 40b. The structure of the third guide channel 33 in the fourth first end plate 30d may refer to the description of the third guide channel 43 in the second second end plate 40b, and will not be described in detail here.

[0079] In one or more of the first flow guide channel 31, the second flow guide channel 32, the third flow guide channel 43, the first flow guide channel 41, the second flow guide channel 42 and the third flow guide channel 33, the flow area at the end portion is greater than or equal to the flow area at the middle portion, so that when the coolant flows from the end portion of the channel into the middle portion, the flow rate of the coolant increases, thereby improving the heat dissipation efficiency of the rotor assembly 100. Among them, the end portion of the first flow guide channel 31 is respectively used to communicate with the first liquid guide hole 1011 and the opening of the first magnetic steel groove 221 close to the first end plate 30d. The end portion of the second flow guide channel 32 is respectively used to communicate with the opening of the second magnetic steel groove 222 close to the first end plate 30d and the outside of the rotor assembly 100. The end portion of the third flow guide channel 43 is respectively used to communicate with the opening of the first magnetic steel groove 221 close to the second end plate 40c and the opening of the second magnetic steel groove 222 close to the second end plate 40c. The end portions of the first drainage channel 41 are respectively used to communicate with the first liquid guide hole 1011 and the opening of the first magnetic steel slot 221 close to the second end plate 40c. The end portions of the second drainage channel 42 are respectively used to communicate with the opening of the second magnetic steel slot 222 close to the second end plate 40c and the outside of the rotor assembly 100. The end portions of the third drainage channel 33 are respectively used to communicate with the opening of the first magnetic steel slot 221 close to the first end plate 30d and the opening of the second magnetic steel slot 222 close to the first end plate 30d.

[0080] In some embodiments, a second annular groove 45 is provided on the side of the second end plate 40c facing the rotor body 20. The second annular groove 45 penetrates the side wall of the second shaft hole 44 and connects the first drainage channel 41 and the second liquid guide hole 1012. The second annular groove 45 is used to connect at least part of the first drainage channel 41 close to the end of the rotating shaft 10. When the coolant flows from the second liquid guide hole 1012 into the second annular groove 45, the second annular groove 45 can guide the coolant to flow along the circumferential direction Z of the rotating shaft 10, and distribute the coolant to the first drainage channel 41, so as to improve the uniformity of the distribution of the coolant in different first drainage channels 41, thereby improving the heat dissipation uniformity of the rotor assembly 100 and improving the heat dissipation effect. In some embodiments, a first annular groove 35 is provided on the side of the first end plate 30d facing the rotor body 20. In some embodiments, a first annular groove 35 is provided on the side of the first end plate 30d facing the rotor body 20, and a second annular groove 45 is provided on the side of the second end plate 40c facing the rotor body 20.

[0081] See also Fig.15 , Fig.15 It is a schematic diagram of the structure of the fourth second end plate 40d provided in an embodiment of the utility model. The structure of the fourth second end plate 40d in the present application is similar to the structure of the third second end plate 40c, except that the number of the first drainage channels 41 is set to three, and each first drainage channel 41 is respectively connected to the third air gap channels 2214 in the three adjacent first magnetic steel grooves 221. Among them, the structure of the first drainage channel 41 in the fourth second end plate 40d can be similar to or the same as the structure of the first drainage channel 31 in the third first end plate 30c. The structure of the first drainage channel 41 in the fourth second end plate 40d can refer to the description of the first drainage channel 31 in the third first end plate 30c mentioned above, and will not be described in detail here.

[0082] In an embodiment of the present application, a motor is also provided, the motor comprising a stator assembly and any one of the above rotor assemblies 100. The rotor assembly 100 is rotatably arranged in the stator assembly. The stator assembly comprises a stator core and a stator winding wound on the stator core. After the stator winding is energized, the rotor assembly 100 can rotate relative to the stator core.

[0083] A vehicle is also provided in an embodiment of the present application, and the vehicle includes wheels, a transmission device and the above-mentioned motor. The motor, the rotating device and the wheel are sequentially connected by transmission. The transmission device is used to transmit the driving force output by the motor to the wheel, so that the motor can drive the wheel to rotate, so that the wheel drives the vehicle to travel. Exemplarily, the vehicle can be a pure electric vehicle, an extended-range electric vehicle, a hybrid electric vehicle, a fuel cell vehicle, a new energy vehicle, etc., and this application does not specifically limit this.

[0084] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A rotor assembly, characterized in that: include: A rotating shaft, wherein the rotating shaft is provided with a liquid conducting channel along the axial direction, and a first liquid conducting hole communicating with the liquid conducting channel is provided on a peripheral side wall of the rotating shaft; A rotor body is sleeved on the rotating shaft, wherein the rotor body is provided with a first magnetic steel groove and a second magnetic steel groove along the axial direction of the rotating shaft, wherein the second magnetic steel groove is located on a side of the first magnetic steel groove away from the rotating shaft, and the first magnetic steel groove and the second magnetic steel groove are spaced apart and not connected along the radial direction and the circumferential direction of the rotating shaft; a first end plate, sleeved on the rotating shaft and located at one end of the rotor body, the first end plate being provided with a first guide channel and a second guide channel, the first guide channel being connected to the first liquid guide hole and the first magnetic steel slot; the second guide channel being connected to the second magnetic steel slot and the outside of the rotor assembly; The second end plate is sleeved on the rotating shaft and is located at an end of the rotor body away from the first end plate. A third guide channel is opened on the second end plate, and the third guide channel connects the first magnetic steel slot and the second magnetic steel slot.

2. The rotor assembly according to claim 1, characterized in that: The first magnetic steel slot comprises a first slot segment and a second slot segment arranged along the circumferential direction of the rotating shaft, and an end of the first slot segment close to the rotating shaft and an end of the second slot segment close to the rotating shaft are connected to form a first air gap channel; the second magnetic steel slot comprises a third slot segment and a fourth slot segment arranged along the circumferential direction of the rotating shaft, and an end of the third slot segment close to the rotating shaft and an end of the fourth slot segment close to the rotating shaft are connected to form a second air gap channel; the ends of the first slot segment and the second slot segment that are away from each other respectively form a third air gap channel, and the ends of the third slot segment and the fourth slot segment that are away from each other respectively form a fourth air gap channel; The first flow guide channel is connected to the first liquid guide hole and the first air gap channel, the third flow guide channel is connected to the first air gap channel and the second air gap channel, and the second flow guide channel is connected to the second air gap channel and the outside of the rotor assembly; or, The first guide channel connects the first liquid guide hole and the third air gap channel, the third guide channel connects the third air gap channel and the fourth air gap channel, and the second guide channel connects the fourth air gap channel and the outside of the rotor assembly.

3. The rotor assembly according to claim 1, characterized in that: A second liquid guide hole connected to the liquid guide channel is also provided on the peripheral side wall of the rotating shaft, a first drainage channel and a second drainage channel are also provided on the second end plate, and a third drainage channel is also provided on the first end plate. The first drainage channel connects the second liquid guide hole and the first magnetic steel groove, the second drainage channel connects the second magnetic steel groove and the outside of the rotor assembly, and the third drainage channel connects the first magnetic steel groove and the second magnetic steel groove.

4. The rotor assembly according to claim 3, characterized in that: The first magnetic steel slot comprises a first slot segment and a second slot segment arranged along the circumferential direction of the rotating shaft, and an end of the first slot segment close to the rotating shaft and an end of the second slot segment close to the rotating shaft are connected to form a first air gap channel; the second magnetic steel slot comprises a third slot segment and a fourth slot segment arranged along the circumferential direction of the rotating shaft, and an end of the third slot segment close to the rotating shaft and an end of the fourth slot segment close to the rotating shaft are connected to form a second air gap channel; the ends of the first slot segment and the second slot segment that are away from each other respectively form a third air gap channel, and the ends of the third slot segment and the fourth slot segment that are away from each other respectively form a fourth air gap channel; The first flow guide channel is connected to the first liquid guide hole and the first air gap channel, the third flow guide channel is connected to the first air gap channel and the second air gap channel, and the second flow guide channel is connected to the second air gap channel and the outside of the rotor assembly; The first drainage channel is connected to the second liquid guide hole and the third air gap channel, the third drainage channel is connected to the third air gap channel and the fourth air gap channel, and the second drainage channel is connected to the fourth air gap channel and the outside of the rotor assembly.

5. The rotor assembly according to claim 3, characterized in that: The first end plate is provided with a first axial hole, the rotating shaft is inserted into the first axial hole, the first end plate is provided with a first annular groove on a side facing the rotor body, the first annular groove penetrates through a side wall of the first axial hole, and connects the first flow guide channel and the first liquid guide hole, and / or the second end plate is provided with a second axial hole, the rotating shaft is inserted into the second axial hole, the second end plate is provided with a second annular groove on a side facing the rotor body, the second annular groove penetrates through a side wall of the second axial hole, and connects the first flow guide channel and the second liquid guide hole.

6. The rotor assembly according to claim 3, characterized in that: In one or more of the first guide channel, the second guide channel, the third guide channel, the first drainage channel, the second drainage channel and the third drainage channel, the flow area at the end portion is greater than or equal to the flow area at the middle portion.

7. The rotor assembly according to claim 1, characterized in that The number of the first magnetic steel grooves is an integer multiple of the number of the first flow guiding channels, and each of the first flow guiding channels is connected to at least one of the first magnetic steel grooves.

8. The rotor assembly according to any one of claims 1 to 7, characterized in that: The rotor body includes a plurality of rotor units arranged along the axial direction of the rotating shaft, each of the rotor units includes a rotor bracket and a plurality of rotor punchings, the rotor bracket is sleeved on the rotating shaft, a plurality of the rotor punchings are connected to the rotor bracket, and at least some of the rotor punchings are detachably connected to the rotor bracket, and the first magnetic steel slot and the second magnetic steel slot are opened on the rotor punchings.

9. The rotor assembly according to claim 8, characterized in that The rotor support comprises a support body and a plurality of extension arms, wherein the plurality of extension arms are arranged at intervals along the circumferential direction of the rotating shaft on a side of the support body away from the rotating shaft, and the rotor punching is installed between any two adjacent extension arms.

10. The rotor assembly according to any one of claims 1 to 7, characterized in that: The rotor assembly further comprises a protective sleeve, which is sleeved on the outer peripheral wall of the rotor body.

11. A motor, characterized in that: The motor comprises a stator assembly and a rotor assembly as claimed in any one of claims 1 to 10, wherein the rotor assembly is rotatably disposed in the stator assembly.

12. A vehicle, characterized in that: The vehicle comprises wheels and the motor according to claim 11, wherein the motor is used to drive the wheels to rotate.

Images