Motor, wheel assembly and vehicle

Abstract

The invention provides a motor, a wheel assembly and a vehicle, and relates to the technical field of motors. According to the motor provided by the invention, the motor adopts a structure that double stators are matched with a single rotor, so that the torque density of the motor is increased. According to the motor provided by the invention, the outer stator and the inner stator are arranged in a sleeving manner, so that the outer stator is located at the outer side of the inner stator, and therefore, even if a double-stator structure is adopted, the two stators do not occupy the axial space of the motor when being arranged. Therefore, according to the motor provided by the invention, the situation that the axial size of the wheel assembly is too large due to the fact that the axial size of the motor is too large when the motor is applied to the wheel assembly can be avoided.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a motor, a wheel assembly and a vehicle. Background Art

[0002] With the rapid development of new energy vehicle technology, the torque density requirements for hub motors are getting higher and higher, and the size of the wheel hub where the hub motor is located is an important factor that restricts the improvement of the torque density of the hub motor. The topological structure of the hub motor directly affects the torque density of the motor. Therefore, improving the topological structure of the hub motor plays an important role in promoting high torque density motors. The current hub motor topology generally adopts multiple motors arranged axially in parallel to increase the torque. However, multiple motors occupy the axial space of the hub, making the axial size of the wheel larger. Some other existing solutions use an outer rotor topology with the rotor on the outside of the stator to increase the torque. However, in order to obtain a larger torque, the outer diameter of the motor core needs to be enlarged, occupying the radial space of the hub, making the outer diameter of the wheel larger. Summary of the invention

[0003] In view of this, the present application provides a motor, a wheel assembly and a vehicle, the purpose of which is to solve the above technical problems to a certain extent.

[0004] In a first aspect, the present application provides a motor, the motor is used to be connected to a wheel hub bearing of a vehicle, the motor has an axial direction and a radial direction, and the motor comprises:

[0005] An outer stator and an inner stator, wherein the outer stator is sleeved on the inner stator to be located on the outer side of the inner stator in a radial direction, and an annular space is defined by the inner side of the outer stator and the outer side of the inner stator;

[0006] The rotor comprises an annular wall and a shaft portion, wherein the annular wall is connected to the shaft portion, the annular wall is located on the radially outer side of the shaft portion, the annular wall is inserted into the annular spacer, and is spaced apart from the outer stator and the inner stator in the radial direction, and the shaft portion is connected to the wheel hub bearing of the vehicle.

[0007] On the basis of the above scheme, preferably, the rotor is a yokeless structure, and the motor also has a circumferential direction, wherein the annular wall includes a plurality of magnet assemblies and a plurality of support parts, the support parts extend along the axial direction, the plurality of support parts are arranged at intervals along the circumferential direction, and the magnet assemblies are arranged between adjacent support parts.

[0008] Based on any of the above solutions, preferably, the magnet assembly is detachably connected to the adjacent support portion.

[0009] On the basis of any of the above solutions, preferably, the support portion includes a fixing portion and a head portion, the head portion is connected to one side of the fixing portion in the axial direction, the cross-sectional area of ​​the head portion is larger than that of the fixing portion, and the magnet assembly abuts against the side of the head portion where the fixing portion is located;

[0010] Grooves are provided on both sides of the magnet assembly in the circumferential direction. The grooves extend along the axial direction. Part of the fixing portion of the support portion detachably connected to the magnet assembly is accommodated in the corresponding recessed portion.

[0011] On the basis of any of the above solutions, preferably, the magnet assembly includes a plurality of magnet components, the plurality of magnet components are arranged in sequence along the axial direction, and the magnet components adjacent to each other in the axial direction are connected to each other.

[0012] On the basis of any of the above solutions, preferably, the rotor further comprises a connecting disk, wherein the connecting disk connects the annular wall and the shaft portion;

[0013] The annular wall and the shaft portion are located on the same side of the connecting disk in the axial direction.

[0014] On the basis of any of the above schemes, preferably, the rotor is a yokeless structure, and the motor further has a circumferential direction, wherein the annular wall comprises a plurality of magnet assemblies and a plurality of support portions, the support portions extend along the axial direction, the plurality of support portions are arranged at intervals along the circumferential direction, the magnet assemblies are arranged between adjacent support portions, and the plurality of support portions are all connected to the connecting disk;

[0015] Wherein, the supporting portion includes a fixing portion and a head portion, the head portion is connected to one side of the fixing portion in the axial direction, the cross-sectional area of ​​the head portion is larger than that of the fixing portion, and the head portion is connected to the connecting disk.

[0016] Based on any of the above solutions, preferably, the connecting disk, the shaft portion and the plurality of supporting portions form an integrated structure.

[0017] Based on any of the above solutions, preferably, the connecting disk, the shaft portion and the plurality of supporting portions are formed into a non-magnetic conductive structure.

[0018] On the basis of any of the above solutions, preferably, the motor further comprises an end cover, and the inner stator and the outer stator are both connected to the end cover;

[0019] Wherein, the end cover has an outer cylindrical surface and an inner cylindrical surface extending along the axial direction, the inner cylindrical surface is located on the inner side of the outer cylindrical surface, the inner stator is sleeved on the outer cylindrical surface and has an interference fit with the outer cylindrical surface, and the outer stator abuts against the inner cylindrical surface and has an interference fit with the inner side of the inner cylindrical surface.

[0020] On the basis of the above scheme, preferably, the motor includes a rotor shaft and a nut, the rotor shaft is sequentially passed through the wheel hub bearing and the shaft portion, the nut is screwed on the rotor shaft, and the nut abuts against a side of the shaft portion away from the wheel hub bearing.

[0021] A second aspect of the present application provides a wheel assembly, which includes the motor as described above, and the wheel assembly also includes a wheel hub and a hub bearing connected to the wheel hub, and the motor is connected to the hub bearing.

[0022] A third aspect of the present application provides a vehicle, comprising the wheel assembly as described above.

[0023] According to the motor provided by the present application, the motor adopts a double stator with a single rotor structure to increase the torque density of the motor. According to the motor provided by the present application, the outer stator and the inner stator are arranged in a sleeve arrangement so that the outer stator is located outside the inner stator. In this way, even if a double stator structure is adopted, the two stators do not occupy the axial space of the motor when arranged. Therefore, the motor provided by the present application can avoid the situation where the axial size of the wheel assembly is too large due to the excessive axial size of the motor itself when applied to the wheel assembly.

[0024] Therefore, compared with the prior art, the motor provided in the present application can improve the torque density of the motor without increasing the axial size of the motor, and the outer diameter of the motor core will not increase due to the provision of an outer rotor.

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram showing an exploded view of a motor provided according to an embodiment of the present application;

[0028] Figure 2 A schematic diagram showing a cross-sectional view of a motor provided according to an embodiment of the present application is shown;

[0029] Figure 3 A schematic diagram showing a three-dimensional diagram of an outer stator and an inner stator of a motor provided according to an embodiment of the present application is shown;

[0030] Figure 4 A schematic diagram showing a three-dimensional diagram of a rotor of a motor provided according to an embodiment of the present application is shown;

[0031] Figure 5 A three-dimensional schematic diagram of a bracket of a motor provided according to an embodiment of the present application is shown;

[0032] Figure 6 A schematic diagram of a three-dimensional diagram of a magnet component of a motor provided according to an embodiment of the present application is shown.

[0033] Reference numerals:

[0034] 1-wheel hub bearing; 2-motor front end cover; 3-external stator; 4-motor rear end cover; 5-rotor; 6-nut; 7-rotor shaft; 8-revolving rotor; 9-revolving stator; 10-inner stator; 11-bracket; 12-magnet component. DETAILED DESCRIPTION

[0035] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0039] According to a first aspect of an embodiment of the present application, a motor is provided. Figures 1 to 6 Describe the structure and working principle of the motor in detail.

[0040] According to an embodiment of the present application, a motor is provided, which is used to be connected to a wheel hub bearing 1 of a vehicle. The motor has an axial direction and a radial direction, and includes an outer stator 3, an inner stator 10, and a rotor 5.

[0041] In the embodiment, the outer stator 3 is sleeved on the inner stator 10 to be located on the outer side of the inner stator 10 in the radial direction, and an annular space is defined by the inner side of the outer stator 3 and the outer side of the inner stator 10 .

[0042] In the embodiment, the rotor 5 includes an annular wall and a shaft portion, the annular wall is connected to the shaft portion, the annular wall is located on the radially outer side of the shaft portion, the annular wall is inserted into the annular gap, and is radially spaced apart from the outer stator 3 and the inner stator 10, and the shaft portion is connected to the wheel hub bearing 1 of the vehicle.

[0043] Thus, according to the motor provided in the embodiment of the present application, the motor adopts a double stator with a single rotor 5 structure, so as to increase the torque density of the motor. According to the motor provided in the embodiment of the present application, the outer stator 3 and the inner stator 10 are arranged in a sleeve arrangement, so that the outer stator 3 is located outside the inner stator 10, so that even if a double stator structure is adopted, the two stators do not occupy the axial space of the motor when arranged. Therefore, according to the motor provided in the embodiment of the present application, when applied to the wheel assembly, the axial size of the wheel assembly is too large due to the excessive axial size of the motor itself.

[0044] Therefore, the motor provided according to the embodiment of the present application, compared with the prior art, can improve the torque density of the motor without increasing the axial size of the motor, and at the same time, the outer diameter of the motor core will not increase due to the provision of the outer rotor 5.

[0045] In addition, in an embodiment, according to the motor provided in an embodiment of the present application, the rotor 5 is located in an annular interval jointly defined by the outer stator 3 and the inner stator 10, and the rotor 5 is spaced apart from the outer stator 3 and the inner stator 10. While ensuring the electrical performance of the motor, the position of the rotor 5 is between the outer stator 3 and the inner stator 10, reusing the radial space already occupied by the outer stator 3, so that the setting of the rotor 5 does not increase the radial size of the motor, making the structure of the motor more compact.

[0046] In the embodiment, it should be noted that the rotor 5, the inner stator 10 and the outer stator 3 mentioned above are all commonly referred to as a “rotor assembly”, an “inner stator assembly” and an “outer stator assembly”.

[0047] According to the motor provided in the embodiment of the present application, the rotor 5 may be, for example, a yokeless structure, and the motor may also have a circumferential direction. In an embodiment, the annular wall may include a plurality of magnet assemblies and a plurality of support portions, the support portions may extend along the axial direction, the aforementioned plurality of support portions may be arranged at intervals along the circumferential direction, and the magnet assemblies may be arranged between adjacent support portions.

[0048] In an embodiment, as an example, the annular wall is essentially composed of the support part and the magnet assembly as above, wherein the support part is used to support the magnet assembly so that the magnet assembly is arranged along the circumference, and then the multiple support parts arranged along the circumference and the multiple magnet assemblies arranged along the circumference together form the annular wall.

[0049] According to the motor provided in the embodiment of the present application, the magnet assembly can be detachably connected to adjacent support parts. In the embodiment, a magnet assembly can be detachably installed between every two adjacent support parts. As an example, this detachable installation method of the magnet assembly is conducive to the removal and replacement of the magnet assembly from the corresponding adjacent support parts to maintain the rotor 5. In the embodiment, the detachable connection referred to here can be, for example, a mating connection through a convex-concave structure, or the magnet assembly can be inserted between adjacent support parts with a slightly larger size to form a slight detachable interference fit.

[0050] According to the motor provided in the embodiment of the present application, the support portion may include a fixed portion and a head portion, the head portion may be connected to one side of the fixed portion in the axial direction, the cross-sectional area of ​​the head portion may be larger than the fixed portion, and the magnet assembly abuts against the side of the head portion where the fixed portion is located. In the embodiment, the support portion is generally a rod-shaped structure, the cross-sectional area of ​​the head portion of the rod-shaped structure is larger, and the cross-sectional area of ​​the fixed portion is smaller, so as to be used as a limit for the magnet assembly.

[0051] According to the motor provided in the embodiment of the present application, grooves may be provided on both sides of the circumferential direction of the magnet assembly, and the grooves may extend along the axial direction, and the part of the fixed part of the support part detachably connected to the magnet assembly may be accommodated in the corresponding recess. Here, in the embodiment, the fixed part may have convex edges on both sides of the circumferential direction, and the shape of the edges is the same as that of the recess of the corresponding magnet assembly. Thus, on the basis of the aforementioned structure of the support part and the magnet assembly, the magnet assembly can be pushed between two adjacent support parts, and the edges of the two support parts are respectively accommodated by the grooves on both sides of the magnet assembly. The magnet assembly can be fixed between the two support parts, and the magnet assembly further abuts against the heads of the two support parts to limit the magnet assembly in the axial direction.

[0052] According to the motor provided in the embodiment of the present application, the magnet assembly may include a plurality of magnet components 12, the plurality of magnet components 12 are arranged in sequence along the axial direction, and the magnet components 12 adjacent to each other in the axial direction are connected to each other. In the embodiment, the magnet assembly formed by the plurality of separate magnet components 12 can suppress the eddy current loss generated on the magnet assembly.

[0053] As an example, in the embodiment, the magnetic member 12 may be, for example, magnetic steel, and adjacent magnetic steels may be connected by bonding.

[0054] According to the motor provided in the embodiment of the present application, the rotor 5 may further include a connecting disk, which connects the annular wall and the shaft portion. In the embodiment, the annular wall and the shaft portion are located on the same side of the connecting disk in the axial direction. As an example, the annular wall may have a greater axial length, which allows the shaft portion to reuse the axial space already occupied by the annular wall, thereby making the space occupied by the rotor 5 smaller. In addition, in the embodiment, the connecting disk may be, for example, a disc-shaped structure.

[0055] According to the motor provided in the embodiment of the present application, specifically, in the embodiment, the support portion as above in the annular wall includes a fixing portion and a head, and the head is connected to the connecting disk, that is, the side of the head facing away from the fixing portion in the axial direction is connected to the connecting disk.

[0056] Furthermore, in the embodiment, the shaft portion protrudes from the side where the annular wall of the connecting plate is located. As an example, the shaft portion has a through hole extending along the axial direction for assembly with the wheel hub bearing 1, which will be explained in the subsequent description.

[0057] According to the motor provided in the embodiment of the present application, the connecting disk, the shaft portion and the above-mentioned multiple support portions form an integrated structure. In the embodiment, as an example, the connecting disk, the shaft portion and the above-mentioned multiple supports are formed into a bracket 11 that is essentially configured for the rotor 5. These structures are an integrated structure, which is conducive to improving the integrity of the rotor 5, thereby improving the reliability of the rotor 5.

[0058] According to the motor provided in the embodiment of the present application, the connecting disk, the shaft portion and the plurality of supporting portions are formed into a non-magnetic structure, for example, formed of non-magnetic stainless steel, thereby reducing the eddy current loss generated on the bracket 11. In addition, in the embodiment, the thickness of the fixing portion of the supporting portion (i.e., the dimension in the radial direction) is smaller than the thickness of the magnetic member (i.e., the dimension in the radial direction), thereby facilitating the reduction of the eddy current loss generated on the supporting portion.

[0059] According to the motor provided in the embodiment of the present application, the motor may further include an end cover, and the inner stator 10 and the outer stator 3 may both be connected to the end cover. The end cover referred to here may be, for example, a front end cover 2 of the motor.

[0060] In an embodiment, the motor front end cover 2 may have an outer cylindrical surface and an inner cylindrical surface extending along the axial direction, the inner cylindrical surface is located on the inner side of the outer cylindrical surface, the inner stator 10 is sleeved on the outer cylindrical surface and has an interference fit with the outer cylindrical surface, and the outer stator 3 abuts against the inner cylindrical surface and has an interference fit with the inner side of the inner cylindrical surface. In this way, the outer stator 3 and the inner stator 10 are fixed in a more convenient way to improve the assembly efficiency of the motor. In an embodiment, the motor may also include a motor rear end cover 4, which closes the motor front end cover 2 from the open side of the motor front end cover 2 to close the outer stator 3, the inner stator 10 and the rotor 5 in the cavity of the motor.

[0061] According to the motor provided in the embodiment of the present application, the wheel assembly may include a rotor shaft 7 and a nut 6. The rotor shaft 7 is sequentially inserted into the wheel hub bearing 1 (for example, the inner ring of the wheel hub bearing 1) and the shaft portion. The nut 6 is screwed on the rotor shaft 7. The nut 6 abuts against the side of the shaft portion away from the wheel hub bearing 1, thereby fixing the inner ring of the wheel hub bearing 1 and the rotor shaft 7.

[0062] In the embodiment, the stator core in the inner stator assembly is formed by stamping thin silicon steel sheets and then stacking them, and the winding adopts concentrated winding or distributed winding. The stator core in the outer stator assembly is formed by stamping thin silicon steel sheets and then stacking them, and the winding adopts concentrated winding or distributed winding. The number of stator teeth and the number of stator slots of the outer stator assembly and the inner stator assembly are the same, and the axial stacking height of the stator core is the same. In addition, the motor also includes a resolver rotor 8 and a resolver stator 9, the resolver rotor 8 is mounted on the bracket 11 of the rotor 5, and the resolver stator 9 is mounted on the front end cover 2 of the motor.

[0063] According to the motor provided in the embodiment of the present application, the radial space of the hub motor is fully utilized, and the torque density of the hub motor is effectively improved. The rotor assembly adopts a yokeless structure, eliminating the traditional rotor 5 core, shortening the magnetic path between the stator and the rotor 5, reducing the loss of the rotor 5, and also reducing the weight of the rotor 5. The bracket 11 of the rotor 5 is made of non-magnetic stainless steel, avoiding magnetic leakage between the two magnets, and improving the output torque of the hub motor. The thickness of the bracket 11 of the rotor 5 and the magnet at the joint is lower than the thickness of the magnet, which effectively reduces the eddy current loss on the bracket 11 of the rotor 5. The motor shares the hub bearing 1, which reduces the number of bearings of the motor itself, simplifies the structure, and also reduces the bearing loss, which is beneficial to improving the efficiency of the hub motor.

[0064] According to a second aspect of an embodiment of the present application, a wheel assembly is provided, which includes the motor as described above and the beneficial effects as described above, which will not be repeated here. The wheel assembly also includes a wheel hub and a wheel hub bearing 1 as described above connected to the wheel hub.

[0065] According to a third aspect of an embodiment of the present application, a vehicle is provided. The vehicle includes a wheel assembly as described above. The vehicle may be, for example, a new energy vehicle that is at least partially driven by electric energy.

[0066] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. All equivalent structural changes made using the contents of the present application specification and drawings under the innovative concept of the present application, or direct / indirect application in other related technical fields are included in the protection scope of the present application.

Claims

1. A motor, characterized in that: The motor is used to connect with the wheel hub bearing of the vehicle, the motor has axial and radial directions, and the motor comprises: An outer stator and an inner stator, wherein the outer stator is sleeved on the inner stator to be located on the outer side of the inner stator in a radial direction, and an annular space is defined by the inner side of the outer stator and the outer side of the inner stator; The rotor comprises an annular wall and a shaft portion, wherein the annular wall is connected to the shaft portion, the annular wall is located on the radially outer side of the shaft portion, the annular wall is inserted into the annular spacer, and is spaced apart from the outer stator and the inner stator in the radial direction, and the shaft portion is connected to the wheel hub bearing of the vehicle.

2. The motor according to claim 1, characterized in that The rotor is a yokeless structure, and the motor also has a circumference, wherein the annular wall includes a plurality of magnet assemblies and a plurality of support portions, the support portions extend along the axial direction, the plurality of support portions are arranged at intervals along the circumference, and the magnet assemblies are arranged between adjacent support portions.

3. The motor according to claim 2, characterized in that The magnet assembly is detachably connected to the adjacent support portion.

4. The motor according to claim 3, characterized in that The support portion includes a fixing portion and a head portion, wherein the head portion is connected to one side of the fixing portion in the axial direction, the cross-sectional area of ​​the head portion is larger than that of the fixing portion, and the magnet assembly abuts against the side of the fixing portion of the head portion; Grooves are provided on both sides of the magnet assembly in the circumferential direction. The grooves extend along the axial direction. Part of the fixing portion of the support portion detachably connected to the magnet assembly is accommodated in the corresponding recessed portion.

5. The motor according to claim 2, characterized in that: The magnet assembly includes a plurality of magnet components, which are sequentially arranged along the axial direction, and magnet components adjacent to each other in the axial direction are connected to each other.

6. The motor according to claim 1, characterized in that The rotor further comprises a connecting disk, wherein the connecting disk connects the annular wall and the shaft portion; The annular wall and the shaft portion are located on the same side of the connecting disk in the axial direction.

7. The motor according to claim 6, characterized in that The rotor is a yokeless structure, and the motor also has a circumferential direction, wherein the annular wall includes a plurality of magnet assemblies and a plurality of support portions, the support portions extend along the axial direction, the plurality of support portions are arranged at intervals along the circumferential direction, the magnet assemblies are arranged between adjacent support portions, and the plurality of support portions are all connected to the connection disk; Wherein, the supporting portion includes a fixing portion and a head portion, the head portion is connected to one side of the fixing portion in the axial direction, the cross-sectional area of ​​the head portion is larger than that of the fixing portion, and the head portion is connected to the connecting disk.

8. The motor according to claim 7, characterized in that The connecting disk, the shaft portion, and the plurality of supporting portions are formed into an integral structure.

9. The motor according to claim 7, characterized in that The connecting disk, the shaft portion, and the plurality of supporting portions are formed into a non-magnetic conductive structure.

10. The motor according to claim 7, characterized in that The motor further comprises an end cover, and the inner stator and the outer stator are both connected to the end cover; Wherein, the end cover has an outer cylindrical surface and an inner cylindrical surface extending along the axial direction, the inner cylindrical surface is located on the inner side of the outer cylindrical surface, the inner stator is sleeved on the outer cylindrical surface and has an interference fit with the outer cylindrical surface, and the outer stator abuts against the inner cylindrical surface and has an interference fit with the inner side of the inner cylindrical surface.

11. The motor according to claim 1, characterized in that The motor comprises a rotor shaft and a nut. The rotor shaft is sequentially passed through the wheel hub bearing and the shaft portion. The nut is screwed on the rotor shaft and abuts against a side of the shaft portion away from the wheel hub bearing.

12. A wheel assembly, characterized in that: The wheel assembly comprises the motor according to any one of claims 1 to 11, the wheel assembly further comprises a wheel hub and a wheel hub bearing connected to the wheel hub, and the motor is connected to the wheel hub bearing.

13. A vehicle, characterized in that: The vehicle comprises the wheel assembly of claim 12.

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