Motor and vehicle

Abstract

The invention discloses a motor and a vehicle, the motor comprises a first shell, an inner rotor, an inner stator, an outer stator and an outer rotor, the inner rotor, the inner stator, the outer stator and the outer rotor are coaxial and are sequentially arranged outwards in the radial direction of the inner rotor, and the inner rotor and the outer rotor are both rotatably installed in the first shell; the outer stator is provided with a plurality of first through holes extending in the axial direction of the outer stator, the inner stator is provided with a plurality of second through holes extending in the axial direction of the inner stator, any first through hole and any second through hole are arranged at intervals in the circumferential direction of the inner rotor, and the outer stator is connected with the first shell through first fasteners penetrating through the first through holes. And the inner stator is connected with the first shell through a second fastener penetrating through the second through hole. The motor provided by the invention has the advantages of compact radial size, small volume and light weight.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a motor and a vehicle. BACKGROUND

[0002] The extended-range or hybrid drive vehicle needs to adopt a dual-motor system, in order to reduce the axial size of the dual-motor system, the stators and rotors of the two motors are usually arranged in a radial direction in a nested manner, that is, the stator and rotor of one motor are nested in the stator and rotor of the other motor, and the two stators are fixed on the motor shell through bolts. In the related art, the two stators usually need to be thickened to be connected to the shell through the bolts, and the two stators are also arranged to be spaced apart in the radial direction to avoid electromagnetic interference, however, the above arrangement easily leads to the radial size of the motor being too large, and further leads to the volume and weight of the motor being too large, and there is still the defect that the motor is difficult to arrange on the vehicle. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0004] To this end, an embodiment of the present application provides a motor, which has the advantages of compact radial size, small volume and light weight.

[0005] An embodiment of the present application also provides a vehicle.

[0006] The motor of the embodiment of the present application comprises a first shell, an inner rotor, an inner stator, an outer stator and an outer rotor, the inner rotor, the inner stator, the outer stator and the outer rotor are coaxial and arranged in sequence along the radial direction of the inner rotor, and the inner rotor and the outer rotor are both rotationally installed in the first shell.

[0007] The outer stator is provided with a plurality of first through holes extending along the axial direction of the outer stator, the inner stator is provided with a plurality of second through holes extending along the axial direction of the inner stator, any one of the first through holes and any one of the second through holes are arranged in a spaced apart manner along the circumferential direction of the inner rotor, the outer stator is connected to the first shell through first fasteners penetrating the first through holes, and the inner stator is connected to the first shell through second fasteners penetrating the second through holes.

[0008] The motor according to the embodiment of the present application, the outer rotor and the outer stator constitute an outer motor, the inner rotor and the inner stator constitute an inner motor, and the outer motor and the inner motor achieve the dual-motor use requirement of the extended-range and hybrid power driving vehicle. Wherein, the part of the outer stator provided with the first through hole and the part of the inner stator provided with the second through hole are arranged opposite to each other along the circumferential direction of the inner rotor instead of being arranged along the radial direction of the inner rotor, thereby effectively reducing the radial dimension occupied by the inner stator and the outer stator, making the inner stator and the outer stator more compact, making the inner stator and the outer stator occupy less internal space of the first shell, and making the motor lighter in volume and weight.

[0009] In some embodiments, the plurality of first through holes and the plurality of second through holes are alternately and spacedly arranged along the circumferential direction of the inner rotor.

[0010] The first shell comprises an end plate opposite to the inner stator and the outer stator along the axial direction of the inner rotor, the first fastener passes through the corresponding first through hole and is connected with the end plate, and the second fastener passes through the corresponding second through hole and is connected with the end plate.

[0011] In some embodiments, the outer stator comprises an outer stator yoke, the inner stator comprises an inner stator yoke, the inner circumferential surface of the outer stator yoke is provided with a plurality of first connecting portions extending towards the inner stator yoke, the outer circumferential surface of the inner stator yoke is provided with a plurality of second connecting portions extending towards the outer stator yoke, the plurality of first connecting portions and the plurality of second connecting portions are alternately and spacedly arranged along the circumferential direction of the inner rotor, each of the first connecting portions is provided with one of the first through holes, and each of the second connecting portions is provided with one of the second through holes.

[0012] In some embodiments, the inner circumferential surface of the outer stator yoke is provided with a first slot for accommodating at least part of the second connecting portions, and the outer circumferential surface of the inner stator yoke is provided with a second slot for accommodating at least part of the first connecting portions.

[0013] In some embodiments, the surface of the end plate facing the inner stator is provided with a plurality of first threaded holes and a plurality of second threaded holes;

[0014] The first fastener and the second fastener are both threaded members, the first fastener passes through the first through hole and is threadedly connected with the first threaded hole, and the second fastener passes through the second through hole and is threadedly connected with the second threaded hole.

[0015] In some embodiments, the motor further comprises:

[0016] A rotor shaft is connected with the inner rotor by a key, the end plate is provided with a first stepped hole, and at least part of the rotor shaft passes through the first stepped hole and is exposed outside the first shell.

[0017] A first bearing is fitted between the inner wall surface of the first stepped hole and the outer peripheral surface of the rotor shaft.

[0018] In some embodiments, the motor further comprises:

[0019] A second housing is integrally formed with the first housing, and the inner cavity of the second housing is in communication with the inner cavity of the first housing through the first stepped hole;

[0020] An input shaft is rotatably installed in the second housing and coaxially connected to the rotor shaft;

[0021] An output shaft and a gear transmission mechanism, the output shaft is rotatably installed on the second housing, and the output shaft is drivingly connected to the input shaft through the gear transmission mechanism.

[0022] In some embodiments, the motor further comprises a rotor hub located in the first housing and coaxially connected to the outer rotor, at least part of the outer rotor hub is located on the side of the outer rotor away from the end plate, and is used to be drivingly connected to the flange of the crankshaft of the engine or the range extender;

[0023] And / or, the end surface of the first housing away from the end plate is provided with a mounting hole for being connected to the housing of the engine or the housing of the range extender.

[0024] In some embodiments, a second stepped hole is provided on the rotor hub, and the motor further comprises a second bearing fitted between the inner wall surface of the second stepped hole and the outer peripheral surface of the rotor shaft.

[0025] In some embodiments, the inner rotor and the inner stator constitute a three-phase asynchronous motor;

[0026] And / or, the outer rotor and the outer stator constitute a permanent magnet synchronous motor.

[0027] The vehicle according to the embodiments of the present application comprises the motor according to any one of the above embodiments.

[0028] The technical advantages of the vehicle according to the embodiments of the present application are the same as those of the motor according to the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a sectional view of the motor according to the embodiments of the present application.

[0030] Figure 2 is another sectional view of the motor according to the embodiments of the present application.

[0031] REFERENCE NUMERALS:

[0032] 1, first housing; 11, end plate; 111, threaded hole; 2, inner rotor; 3, inner stator; 31, inner stator yoke; 311, first connecting part; 312, first slot; 313, first through hole; 4, outer stator; 41, outer stator yoke; 411, second connecting part; 412, second slot; 413, second through hole; 5, outer rotor; 6, rotor shaft; 7, rotor hub; 8, first bearing; 9, second bearing; 10, second housing; 110, input shaft; 120, gear transmission mechanism; 130, engine; 140, rotor balance plate. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described below in detail with reference to the accompanying drawings. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0034] The motor according to the embodiments of the present application is described below in combination with Figure 1 and Figure 2

[0035] The motor according to the embodiments of the present application comprises a first housing 1, an inner rotor 2, an inner stator 3, an outer stator 4 and an outer rotor 5. The inner rotor 2, the inner stator 3, the outer stator 4 and the outer rotor 5 are coaxial and arranged in sequence along the radial direction of the inner rotor 2, and the inner rotor 2 and the outer rotor 5 are both rotatably installed in the first housing 1. The outer stator 4 is provided with a plurality of first through holes 313 extending along the axial direction of the outer stator 4, the inner stator 3 is provided with a plurality of second through holes 413 extending along the axial direction of the inner stator 3, any one of the first through holes 313 and any one of the second through holes 413 are arranged in sequence along the circumferential direction of the inner rotor 2, the outer stator 4 is connected with the first housing 1 by first fasteners penetrating through the first through holes 313, and the inner stator 3 is connected with the first housing 1 by second fasteners penetrating through the second through holes 413.

[0036] The motor according to the embodiments of the present application, the outer rotor 5 and the outer stator 4 constitute an outer motor, the inner rotor 2 and the inner stator 3 constitute an inner motor, and the outer motor and the inner motor realize the dual-motor use requirement of the extended-range and hybrid power driven vehicle. Wherein, the part of the outer stator 4 provided with the first through holes 313 and the part of the inner stator 3 provided with the second through holes 413 are arranged in sequence along the circumferential direction of the inner rotor 2 instead of along the radial direction of the inner rotor 2, thereby effectively reducing the radial dimension occupied by the inner stator 3 and the outer stator 4, making the structure of the inner stator 3 and the outer stator 4 more compact, making the inner stator 3 and the outer stator 4 occupy less internal space of the first housing 1, and making the volume and weight of the motor lighter.

[0037] ​It should be noted that the inner stator 3 and the outer stator 4 are radially spaced apart along the inner rotor 2, thereby avoiding electromagnetic interference between them and ensuring the operational reliability of the inner and outer motors. Rotor balance plates 140 are coaxially fixed on both sides of the outer rotor 5 to ensure the dynamic performance and stability of the outer rotor 5. The rotor laminations constituting the inner rotor 2, the stator laminations constituting the inner stator yoke 31, the stator laminations constituting the outer stator yoke 41, and the rotor laminations constituting the outer rotor 5 are all made from the same set of lamination dies, resulting in a low scrap rate and high material utilization rate.

[0038] In some embodiments, such as Figure 1 As shown, a plurality of first through holes 313 and a plurality of second through holes 413 are arranged alternately along the circumference of the inner rotor 2. The first housing 1 includes an end plate 11 that is opposite to the inner stator 3 and the outer stator 4 along the axial direction of the inner rotor 2. A first fastener passes through the corresponding first through hole 313 and is connected to the end plate 11, and a second fastener passes through the corresponding second through hole 413 and is connected to the end plate 11.

[0039] The inner stator 3 and outer stator 4 are connected to the end plate 11 to achieve fixed installation on the first housing 1. At this time, the end of the first housing 1 facing away from the end plate 11 can be opened so that the outer rotor 5 can be connected to the crankshaft of the engine 130 or the flange of the range extender through the opening to realize the start and stop of the engine 130 or the range extender. At the same time, multiple first through holes 313 and multiple second through holes 413 are arranged alternately along the circumference of the inner rotor 2, so that the connection between the inner stator 3 and the outer stator 4 and the end plate 11 does not interfere with each other, and the connection strength between them and the end plate 11 is high.

[0040] Specifically, a plurality of first through holes 313 are arranged at equal intervals along the circumference of the inner rotor 2, and a plurality of second through holes 413 are arranged at equal intervals along the circumference of the inner rotor 2.

[0041] It should be noted that the external motor consisting of the external rotor 5 and the external stator 4 can also be used to generate electricity and charge the power battery.

[0042] In some embodiments, such as Figure 2 As shown, the outer stator 4 includes an outer stator yoke 41, and the inner stator 3 includes an inner stator yoke 31. The inner circumferential surface of the outer stator yoke 41 is provided with a plurality of first connecting portions 311 extending toward the inner stator yoke 31, and the outer circumferential surface of the inner stator yoke 31 is provided with a plurality of second connecting portions 411 extending toward the outer stator yoke 41. The plurality of first connecting portions 311 and the plurality of second connecting portions 411 are arranged alternately along the circumference of the inner rotor 2. Each first connecting portion 311 is provided with a first through hole 313, and each second connecting portion 411 is provided with a second through hole 413.

[0043] Therefore, the first through holes 313 and the second through holes 413 are arranged along the circumferential direction of the inner rotor 2, and the overall thickening treatment of the inner stator yoke 31 and the outer stator yoke 41 is not required, thereby further reducing the space occupied by the inner stator 3 and the outer stator 4, and further reducing the total weight of the motor.

[0044] In some embodiments, as shown in Figure 2 The inner circumferential surface of the outer stator yoke 41 is provided with at least a portion of the first slot 312 matched with the first connecting part 311, and the outer circumferential surface of the inner stator yoke 31 is provided with at least a portion of the second slot 412 matched with the second connecting part 411.

[0045] Therefore, the distance between the inner circumferential surface of the inner stator yoke 31 and the outer circumferential surface of the outer stator yoke 41 is further reduced, and the radial dimension of the motor is further reduced, the structure of the motor is more compact, the volume is smaller, and the weight is stronger.

[0046] Specifically, the cross-sectional shape of the first connecting part 311 and the second connecting part 411 is generally semicircular, and the first slot 312 and the second slot 412 are generally semicircular slots.

[0047] In some embodiments, the surface of the end plate 11 facing the inner stator 3 is provided with a plurality of first threaded holes 111 and a plurality of second threaded holes 111. The first fastener and the second fastener are both threaded fasteners, the first fastener passes through the first through hole 313 and is screwed with the first threaded hole 111, and the second fastener passes through the second through hole 413 and is screwed with the second threaded hole 111.

[0048] Therefore, the connection of each of the inner stator 3 and the outer stator 4 with the end plate 11 is convenient and reliable, and the assembly efficiency of the motor is high.

[0049] Specifically, the first fastener and the second fastener are both bolts, and the end plate 11 is thickened at the first threaded hole 111 and the second threaded hole 111 to effectively ensure the connection strength of the bolts with the end plate 11.

[0050] In some embodiments, as shown in Figure 1 The motor further comprises a second housing 10, an input shaft 110, an output shaft, and a gear transmission mechanism 120. The second housing 10 is integrally formed with the first housing 1, and the inner cavity of the second housing 10 is communicated with the inner cavity of the first housing 1 through the first stepped hole. The input shaft 110 is rotatably installed in the second housing 10 and coaxially connected with the rotor shaft 6. The output shaft is rotatably installed on the second housing 10, and the output shaft is drivingly connected with the input shaft 110 through the gear transmission mechanism 120.

[0051] The input shaft 110, the gear transmission mechanism 120, the output shaft and the second housing 10 constitute a reducer, that is, a reducer integrated with a speed reduction and torque increase on the motor, which can be directly connected with the wheels of the vehicle through the output shaft to realize power output, and the structure of the motor is more compact. Moreover, the design of the integrated first housing 1 and the second housing 10 further improves the motor assembly efficiency.

[0052] Specifically, the part of the rotor shaft 6 protruding from the first housing 1 is located in the second housing 10 and is coaxially connected with the input shaft 110 through the spline, the gear transmission mechanism 120 can be a helical gear transmission mechanism, one of the helical gears is fixed coaxially on the input shaft 110, and one of the helical gears is fixed coaxially on the output shaft. In addition, the second housing 10 is open at one end away from the end plate 11, and the input shaft 110, the gear transmission mechanism 120 and the output shaft are assembled in the second housing 10 through the opening, and the motor further comprises an end cover connected with the second housing 10 to close the opening.

[0053] In some embodiments, as shown in Figure 1 The motor further comprises a rotor hub 7, which is located in the first housing 1 and is coaxially connected with the outer rotor 5, and at least part of the rotor hub 7 is located on the side of the outer rotor 5 away from the end plate 11 and is used to be connected with the flange drive of the crankshaft of the engine 130 or the range extender.

[0054] At this time, the first housing 1 can be open at one end away from the end plate 11, and the rotor hub 7 can realize shielding of the outer rotor 5, the outer stator 4, the inner stator 3 and the inner rotor 2 after being connected with the outer rotor 5, and at the same time, the part of the rotor hub 7 located on the side of the outer rotor 5 away from the end plate 11 is connected with the flange drive of the crankshaft of the engine 130 or the range extender to realize the start-stop of the engine 130 or the range extender, without the need for supporting bearings, thereby effectively reducing the manufacturing cost of the motor.

[0055] Specifically, the end surface of the first housing 1 away from the end plate 11 is provided with a mounting hole for being connected with the housing of the engine 130 or the range extender to ensure that the housing of the engine 130 or the range extender is fixedly connected with the first housing 1. The rotor hub 7 is provided with an assembly hole with an opening facing the end plate 11, and the outer rotor 5 is interference-fitted in the assembly hole.

[0056] In some embodiments, the motor further comprises a rotor shaft 6 and a first bearing 8, the rotor shaft 6 is keyed connected with the inner rotor 2, the end plate 11 is provided with a first stepped hole, at least part of the rotor shaft 6 passes through the first stepped hole and is exposed outside the first housing 1. The first bearing 8 is fitted between the inner wall surface of the first stepped hole and the outer peripheral surface of the rotor shaft 6. The rotor hub 7 is provided with a second stepped hole, and the motor further comprises a second bearing 9, which is fitted between the inner wall surface of the second stepped hole and the outer peripheral surface of the rotor shaft 6.

[0057] That is, the inner motor is connected with the speed reducer through the rotor shaft 6 and realizes power output. The first bearing 8 arranged between the end plate 11 and the rotor shaft 6 ensures the rotation stability of the rotor shaft 6 relative to the first housing 1, and the second bearing 9 arranged between the rotor hub 7 and the rotor shaft 6 ensures the rotation stability of the rotor shaft 6 relative to the rotor hub 7. On the basis that the rotor hub 7 and the end plate 11 are connected with the crankshaft and the housing of the engine 130 respectively, the rotor hub 7 and the end plate 11 better realize reliable support of both ends of the rotor shaft 6, and the operation reliability of the motor is higher.

[0058] In some embodiments, the rotor shaft 6, the inner rotor 2 and the inner stator 3 constitute a three-phase asynchronous motor. That is, the inner rotor 2 has no permanent magnet material, the inner rotor 2 has simple structure, low cost and convenient maintenance, thereby effectively reducing the manufacturing cost and maintenance cost of the motor.

[0059] The outer rotor 5 and the outer stator 4 constitute a permanent magnet synchronous motor. By arranging the outer rotor 5 to include permanent magnet material, the volume of the outer rotor 5 can be reduced while the capacity is the same, thereby further reducing the volume and weight of the motor.

[0060] The vehicle according to the embodiment of the present application comprises the motor according to any one of the above embodiments.

[0061] The technical advantages of the vehicle according to the embodiment of the present application are the same as those of the motor according to the above embodiments.

[0062] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship 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, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0063] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0064] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected", "connection", "fixedly connected", "connected", "fixed", and the like should be construed broadly, for example, can be fixed connection, can be detachable connection, or integral; can be mechanical connection, can be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0066] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present specification without contradiction.

[0067] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. An electric motor, characterized in that, It includes a first housing, an inner rotor, an inner stator, an outer stator, and an outer rotor. The inner rotor, the inner stator, the outer stator, and the outer rotor are coaxial and arranged sequentially outward along the radial direction of the inner rotor. The inner rotor and the outer rotor are both rotatably mounted in the first housing. The outer stator is provided with a plurality of first through holes extending along the axial direction of the outer stator, and the inner stator is provided with a plurality of second through holes extending along the axial direction of the inner stator. Any one of the first through holes and any one of the second through holes are arranged at intervals along the circumference of the inner rotor. The outer stator is connected to the first housing by a first fastener passing through the first through hole, and the inner stator is connected to the first housing by a second fastener passing through the second through hole.

2. The motor according to claim 1, characterized in that, The plurality of first through holes and the plurality of second through holes are arranged alternately at intervals along the circumference of the inner rotor; The first housing includes an end plate opposite to the inner stator and outer stator along the axial direction of the inner rotor, a first fastener passing through a corresponding first through hole and connected to the end plate, and a second fastener passing through a corresponding second through hole and connected to the end plate.

3. The motor according to claim 1, characterized in that, The outer stator includes an outer stator yoke, and the inner stator includes an inner stator yoke. The inner circumferential surface of the outer stator yoke is provided with a plurality of first connecting portions extending toward the inner stator yoke, and the outer circumferential surface of the inner stator yoke is provided with a plurality of second connecting portions extending toward the outer stator yoke. The plurality of first connecting portions and the plurality of second connecting portions are arranged alternately and at intervals along the circumference of the inner rotor. Each first connecting portion is provided with a first through hole, and each second connecting portion is provided with a second through hole.

4. The motor according to claim 3, characterized in that, The inner circumferential surface of the outer stator yoke is provided with a first groove for at least partial engagement of the second connecting portion, and the outer circumferential surface of the inner stator yoke is provided with a second groove for at least partial engagement of the first connecting portion.

5. The motor according to claim 2, characterized in that, The end plate has a plurality of first threaded holes and a plurality of second threaded holes on the surface facing the inner stator; Both the first fastener and the second fastener are threaded components. The first fastener passes through the first through hole and is threaded into the first threaded hole, and the second fastener passes through the second through hole and is threaded into the second threaded hole.

6. The motor according to claim 2, characterized in that, The motor also includes: The rotor shaft is keyed to the inner rotor, and the end plate is provided with a first stepped hole. At least a portion of the rotor shaft passes through the first stepped hole and is exposed outside the first housing. The first bearing is fitted between the inner wall surface of the first stepped hole and the outer peripheral surface of the rotor shaft.

7. The motor according to claim 6, characterized in that, The motor also includes: The second housing is integrally formed with the first housing, and the inner cavity of the second housing communicates with the inner cavity of the first housing through the first stepped hole; An input shaft is rotatably mounted inside the second housing and coaxially connected to the rotor shaft. An output shaft and a gear transmission mechanism are provided. The output shaft is rotatably mounted on the second housing and is connected to the input shaft via the gear transmission mechanism.

8. The motor according to claim 6, characterized in that, The motor also includes a rotor hub located within the first housing and coaxially connected to the outer rotor. At least a portion of the rotor hub is located on the side of the outer rotor away from the end plate and is used for flange drive connection to the crankshaft of the engine or the range extender. And / or, the end face of the first housing opposite to the end plate is provided with mounting holes for connecting to the housing of the engine or the housing of the range extender.

9. The motor according to claim 8, characterized in that, The rotor hub is provided with a second stepped hole, and the motor also includes a second bearing, which is fitted between the inner wall surface of the second stepped hole and the outer peripheral surface of the rotor shaft.

10. The motor according to any one of claims 1-9, characterized in that, The inner rotor and the inner stator constitute a three-phase asynchronous motor; And / or, the outer rotor and the outer stator constitute a permanent magnet synchronous motor.

11. A vehicle, characterized in that, Includes the motor according to any one of claims 1-10.

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