Motor and vehicle

Abstract

The invention relates to a motor and a vehicle, and belongs to the technical field of motors. The motor comprises an inner rotor, a stator, an inner stator winding, an outer stator winding and an outer rotor. The stator surrounds the inner rotor, a plurality of inner stator grooves are formed in the radial inner side of the stator, a plurality of outer stator grooves are formed in the radial outer side of the stator, the inner stator grooves and the outer stator grooves penetrate through the stator in the axial direction of the stator, and the inner stator grooves and the outer stator grooves are distributed around the inner rotor at intervals. The inner stator winding is wound around the plurality of inner stator slots. The outer stator winding is wound around the plurality of outer stator slots. The outer rotor surrounds the stator. Wherein the inner rotor, the stator and the outer rotor are coaxially arranged, and the axial size of an outer stator groove is smaller than that of an inner stator groove. According to the motor and the vehicle, when the inner rotor and the outer rotor operate independently, interference generated between the inner magnetic circuit and the outer magnetic circuit can be weakened.

Description

Technical Field

[0001] This disclosure relates to the field of motor technology, and in particular to a motor and a vehicle. Background Technology

[0002] To improve the integration and compactness of vehicles, some vehicles in related technologies use a dual-rotor motor with one stator and two rotors. The two rotors are located on the radial inner and radial outer sides of the stator, respectively, and can rotate independently to output power separately, thus meeting the needs of a dual-motor hybrid system where one motor generates electricity and the other drives the vehicle.

[0003] However, when the inner and outer rotors are running independently, due to the different frequencies, amplitudes and phases of the inner and outer magnetic fields, the inner and outer magnetic circuits may interfere with each other at the intersection of the stator yoke, which can lead to huge torque fluctuations, affecting the smoothness of operation, or generating additional core losses that result in decreased efficiency and increased heat generation. Summary of the Invention

[0004] Therefore, this disclosure provides an electric motor and vehicle that can reduce interference between the inner and outer magnetic circuits when the inner and outer rotors operate independently. The technical solution is as follows: In a first aspect, an electric motor is provided, the electric motor comprising an inner rotor, a stator, an inner stator winding, an outer stator winding, and an outer rotor; The stator surrounds the inner rotor, and the inner radial side of the stator has a plurality of inner stator slots, and the outer radial side of the stator has a plurality of outer stator slots. The plurality of inner stator slots and the plurality of outer stator slots all penetrate the stator along the axial direction of the stator, and the plurality of inner stator slots and the plurality of outer stator slots are respectively distributed at intervals around the inner rotor. The inner stator windings are wound in the plurality of inner stator slots; The outer stator windings are wound in the plurality of outer stator slots; The outer rotor surrounds the stator; The inner rotor, the stator, and the outer rotor are all coaxially arranged, and the axial dimension of the outer stator slot is smaller than the axial dimension of the inner stator slot.

[0005] In some possible implementations, the stator includes an inner yoke and an outer yoke arranged coaxially; The inner yoke surrounds the inner rotor, and the inner yoke is provided with a plurality of first through holes. The plurality of first through holes all penetrate the inner yoke along the axial direction of the stator, and the plurality of first through holes are filled with magnetic shielding material. The plurality of inner stator slots are disposed on the radial inner side of the inner yoke; The outer yoke surrounds the inner yoke, the axial dimension of the outer yoke is smaller than the axial dimension of the inner yoke, the outer yoke is provided with a plurality of second through holes, the plurality of second through holes all penetrate the outer yoke along the axial direction of the stator, and the plurality of second through holes are filled with magnetic shielding material; The plurality of outer stator slots are disposed on the radial outer side of the outer yoke; The plurality of first through holes and the plurality of second through holes are respectively distributed around the inner rotor at intervals.

[0006] In some possible implementations, the inner yoke portion is integrally formed with the outer yoke portion.

[0007] In some possible implementations, at least a portion of the plurality of first through holes and at least a portion of the plurality of second through holes are radially offset from each other along the stator; Preferably, in the circumferential direction of the stator, the angle at which the plurality of first through holes and the plurality of second through holes overlap is not less than 360°.

[0008] In some possible implementations, the motor further includes a plurality of fasteners, at least a portion of which corresponds one-to-one with at least a portion of the plurality of first through holes and at least a portion of the plurality of second through holes, and the fasteners are disposed through the corresponding first through hole or second through hole; Preferably, the fastener is made of a magnetic shielding material.

[0009] In some possible implementations, at least a portion of the plurality of first through holes is located radially outward of the inner yoke, and at least a portion of the plurality of second through holes is located radially inward of the outer yoke; The first through hole located on the radially outer side of the inner yoke corresponds one-to-one with the second through hole located on the radially inner side of the outer yoke, and the first through hole and the corresponding second through hole together form a third through hole.

[0010] In some possible implementations, when the motor further includes a plurality of fixing members, at least a portion of the plurality of fixing members corresponds one-to-one with at least a portion of the plurality of third through holes, and the fixing members pass through the corresponding third through holes; Preferably, at least a portion of the plurality of first through holes, plurality of second through holes and plurality of third through holes through which the fastener is disposed are circular through holes, and the fastener is a bolt.

[0011] In some possible implementations, the distance between the first end of the inner stator slot and the first end of the outer stator slot along the axial direction of the stator is less than the distance between the second end of the inner stator slot and the second end of the outer stator slot. Preferably, in the axial direction of the stator, the first end of the inner stator groove is flush with the first end of the outer stator groove.

[0012] In some possible implementations, the distance between the first end of the inner stator slot and the first end of the outer stator slot along the axial direction of the stator is equal to the distance between the second end of the inner stator slot and the second end of the outer stator slot.

[0013] In a second aspect, a vehicle is provided, the vehicle comprising the motor described in any of the first aspects.

[0014] In the scheme disclosed herein, the internal magnetic field generated when current flows through the inner stator winding can drive the inner rotor to rotate, and the external magnetic field generated when current flows through the outer stator winding can drive the outer rotor to rotate. Furthermore, the axial dimension of the outer stator slot is smaller than the axial dimension of the inner stator slot, making the axial dimension of the outer stator winding smaller than the axial dimension of the inner stator winding. This reduces the space for the intersection of the internal and external magnetic fields, thereby reducing interference between the inner and outer magnetic circuits when the inner and outer rotors operate independently.

[0015] Furthermore, since the outer diameter of the outer rotor is larger than the inner diameter of the inner rotor, even if the axial dimension of the outer stator slot is smaller than the axial dimension of the inner stator slot, the power output of the outer rotor can reach the power output of the inner rotor, thus meeting the power output requirements of the motor. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the radial cross-sectional structure of an electric motor provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of the axial half-section structure of the first type of motor provided in this embodiment of the present disclosure; Figure 3 This is a schematic diagram of the radial cross-sectional structure of a stator provided in an embodiment of this disclosure; Figure 4 This is a schematic diagram of the radial cross-sectional structure of another stator provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of the axial half-section structure of the second type of motor provided in this embodiment of the present disclosure; Figure 6 This is a schematic diagram of the axial half-section structure of the third type of motor provided in the embodiments of this disclosure.

[0018] Explanation of reference numerals in the attached figures 1. Inner rotor; 11. Inner rotor output shaft; 12. Inner rotor air gap; 2. Stator; 21. Inner yoke; 211. First through hole; 22. Outer yoke; 221. Second through hole; 23. Third through hole; 201. Inner stator slot; 202. Outer stator slot; 3. Inner stator winding; 4. Outer stator winding; 5. Outer rotor; 51. Outer rotor output shaft; 52. Outer rotor air gap; 6. Fixing component. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0020] Firstly, this embodiment relates to a motor, as shown in the reference... Figure 1 and Figure 2 As shown, the motor includes an inner rotor 1, a stator 2, an inner stator winding 3, an outer stator winding 4, and an outer rotor 5. The inner rotor 1 and the outer rotor 5 are rotatably mounted within the motor housing via bearings, while the stator 2 is fixedly mounted within the motor housing.

[0021] like Figure 1 As shown, the stator 2 surrounds the inner rotor 1, and the radially inner side of the stator 2 has a plurality of inner stator slots 201. For example, the number of inner stator slots 201 on the stator 2 can be twenty-four, thirty-six, forty-eight, fifty-four, or seventy-two, etc. The radially outer side of the stator 2 has a plurality of outer stator slots 202. For example, the number of outer stator slots 202 on the stator 2 can be twenty-four, thirty-six, forty-eight, fifty-four, or seventy-two, etc. Optionally, the number of outer stator slots 202 on the stator 2 can be greater than the number of inner stator slots 201.

[0022] refer to Figure 2 As shown, multiple inner stator slots 201 and multiple outer stator slots 202 all penetrate the stator 2 along the axial direction of the stator 2.

[0023] Continue to refer to Figure 1 As shown, multiple inner stator slots 201 and multiple outer stator slots 202 are distributed at intervals around the inner rotor 1. The inner stator winding 3 is wound around the multiple inner stator slots 201. The outer stator winding 4 is wound around the multiple outer stator slots 202. The outer rotor 5 surrounds the stator 2. The inner rotor 1, stator 2, and outer rotor 5 are all coaxially arranged, as shown... Figure 2 As shown, the axial dimension of the outer stator slot 202 is smaller than the axial dimension of the inner stator slot 201. Correspondingly, the axial dimension of the outer rotor 5 can also be smaller than the axial dimension of the inner rotor 1.

[0024] In the scheme disclosed herein, the internal magnetic field generated when current flows through the inner stator winding 3 can drive the inner rotor 1 to rotate, and the external magnetic field generated when current flows through the outer stator winding 4 can drive the outer rotor 5 to rotate. Furthermore, the axial dimension of the outer stator slot 202 is smaller than the axial dimension of the inner stator slot 201, making the axial dimension of the outer stator winding 4 smaller than the axial dimension of the inner stator winding 3. This reduces the space for the intersection of the internal and external magnetic fields, thereby reducing interference between the inner and outer magnetic circuits when the inner rotor 1 and outer rotor 5 operate independently.

[0025] Furthermore, since the outer diameter of the outer rotor 5 is larger than the inner diameter of the inner rotor 1, even if the axial dimension of the outer stator slot 202 is smaller than the axial dimension of the inner stator slot 201, the power output of the outer rotor 5 can reach the power output of the inner rotor 1, thus meeting the power output requirements of the motor.

[0026] In some examples, reference Figure 1 As shown, the stator 2 includes an inner yoke 21 and an outer yoke 22 arranged coaxially. The inner yoke 21 surrounds the inner rotor 1 and is provided with a plurality of first through holes 211.

[0027] Combination Figure 2 As shown, multiple first through holes 211 extend through the inner yoke portion 21 along the axial direction of the stator 2, and each of the multiple first through holes 211 is filled with magnetic shielding material. Multiple inner stator slots 201 are provided on the radially inner side of the inner yoke portion 21. For example, the number of first through holes 211 in the inner yoke portion 21 can be ten, twelve, eighteen, or twenty, etc.

[0028] Continue to refer to Figure 1 As shown, the outer yoke 22 surrounds the inner yoke 21, and the axial dimension of the outer yoke 22 is smaller than that of the inner yoke 21. The outer yoke 22 is provided with a plurality of second through holes 221. For example, the number of second through holes 221 in the outer yoke 22 can be ten, twelve, eighteen, or twenty, etc. Figure 2 As shown, multiple second through holes 221 extend through the outer yoke portion 22 along the axial direction of the stator 2, and each of the multiple second through holes 221 is filled with magnetic shielding material. Multiple outer stator slots 202 are disposed on the radially outer side of the outer yoke portion 22.

[0029] The magnetic shielding material can be one or more of air, stainless steel, and epoxy resin. For example, the magnetic shielding material can be an epoxy resin strip or a stainless steel strip, which can be fixedly installed in the first through hole 211 by adhesive.

[0030] Continue to refer to Figure 1 As shown, multiple first through holes 211 and multiple second through holes 221 are distributed at intervals around the inner rotor 1.

[0031] Thus, the magnetic shielding material filled in the first through hole 211 and the second through hole 221 can separate the inner stator winding 3 and the inner rotor 3 from the outer stator winding 4 and the outer rotor 5, thereby isolating the inner magnetic field from the outer magnetic field, which is beneficial to further reduce the interference generated between the inner and outer magnetic circuits.

[0032] In some examples, the inner yoke 21 and the outer yoke 22 can be two independent parts that are fixedly connected together by welding, snap-fitting, or other methods.

[0033] In some examples, the inner yoke 21 and the outer yoke 22 can also be integrally formed. This is beneficial for improving the mechanical strength of the stator 2 and simplifying the manufacturing process of the stator 2.

[0034] In some examples, at least a portion of the plurality of first through holes 211 is radially offset from at least a portion of the plurality of second through holes 221 in the stator 2.

[0035] For example, in Figure 1 In this configuration, multiple first through holes 211 and multiple second through holes 221 are radially offset from each other along the stator 2. However, in other possible examples, a portion of the multiple first through holes 211 may radially overlap with the multiple second through holes 221, while another portion of the multiple first through holes 211 may radially offset from the multiple second through holes 221.

[0036] In this way, the magnetic shielding material in the first through hole 211 and the second through hole 221 can occupy more space in the circumference of the stator 2, which is conducive to improving the effect of the magnetic shielding material in isolating the internal magnetic field and the external magnetic field, and reducing the interference between the internal and external magnetic circuits.

[0037] In some examples, in the circumferential direction of the stator 2, the angle covered by the superposition of multiple first through holes 211 and multiple second through holes 221 is not less than 360°.

[0038] For example, in Figure 1 In the stator 2, the total coverage angle of the plurality of first through holes 211 in the circumferential direction can be 180°, and the total coverage angle of the plurality of second through holes 221 can also be 180°. Furthermore, the plurality of second through holes 221 can be offset from the plurality of first through holes 211, so that the superimposed coverage angle of the plurality of first through holes 211 and the plurality of second through holes 221 can be 360°. However, in other possible examples, the total coverage angle of the plurality of first through holes 211 can be 180°. A portion of the plurality of second through holes 221 can coincide with the plurality of first through holes 211 radially along the stator 2, and another portion of the plurality of second through holes 221 can be offset from the plurality of first through holes 211 radially along the stator 2 to cover another 180° in the circumferential direction of the stator 2, so that the superimposed coverage angle of the plurality of first through holes 211 and the plurality of second through holes 221 can still be 360°.

[0039] In this way, the magnetic shielding material in the first through hole 211 and the second through hole 221 can maximize the isolation between the internal magnetic field and the external magnetic field, thereby reducing the interference between the internal and external magnetic circuits.

[0040] In some examples, reference Figure 4 As shown, the motor also includes multiple fixing components 6. For example, the motor may include six fixing components 6, eight fixing components 6, ten fixing components 6, twelve fixing components 6, or fourteen fixing components 6, etc.

[0041] At least a portion of the plurality of fasteners 6 correspond one-to-one with at least a portion of the plurality of first through holes 211 and at least a portion of the plurality of second through holes 221, and the fasteners 6 are inserted into the corresponding first through hole 211 or second through hole 221.

[0042] For example, in Figure 4 In this configuration, a portion of each of the multiple fasteners 6 corresponds one-to-one with a portion of each of the multiple first through holes 211 and a portion of each of the multiple second through holes 221, with the fastener 6 passing through the corresponding first through hole 211 or second through hole 221. However, in other possible examples, each of the multiple fasteners 6 may correspond one-to-one with a portion of each of the multiple first through holes 211 and a portion of each of the multiple second through holes 221, or each of the multiple fasteners 6 may correspond one-to-one with a portion of each of the multiple first through holes 211 and multiple second through holes 221, or a portion of each of the multiple fasteners 6 may correspond one-to-one with a portion of each of the multiple first through holes 211 and multiple second through holes 221.

[0043] In this way, the fastener 6 passing through the first through hole 211 can fix the inner yoke 21 to the motor housing, and the fastener 6 passing through the second through hole 221 can fix the outer yoke 22 to the motor housing. Thus, by fixing the inner yoke 21 and the outer yoke 22 separately, the stability of the stator 2 can be improved, and the mechanical strength of the stator 2 can be increased.

[0044] In some examples, the fastener 6 is made of a magnetically shielding material. This allows for both fixation and isolation between the internal and external magnetic fields, reducing interference between the internal and external magnetic circuits.

[0045] For example, fastener 6 can be made of stainless steel.

[0046] In some examples, reference Figure 3 and Figure 4 As shown, at least a portion of the plurality of first through holes 211 is located on the radially outer side of the inner yoke 21, and at least a portion of the plurality of second through holes 221 is located on the radially inner side of the outer yoke 22.

[0047] Combination Figure 6As shown, the first through hole 211 located on the radially outer side of the inner yoke 21 corresponds one-to-one with the second through hole 221 located on the radially inner side of the outer yoke 22. The first through hole 211 and the corresponding second through hole 221 together form the third through hole 23.

[0048] For example, in Figure 3 In this configuration, all eighteen first through holes 211 are located radially outward of the inner yoke 21, and all eighteen second through holes 221 are located radially inward of the outer yoke 22. The eighteen first through holes 211 can be joined with the corresponding eighteen second through holes 221 to form eighteen third through holes 23.

[0049] exist Figure 4 Alternatively, eighteen of the thirty-six first through holes 211 may be located radially outside the inner yoke 21, and eighteen of the thirty-six second through holes 221 may be located radially inside the outer yoke 22. The eighteen first through holes 211 may be joined with the corresponding eighteen second through holes 221 to form eighteen third through holes 23.

[0050] Thus, since the first through hole 211 and the corresponding second through hole 221 together form the third through hole 23, the radial dimension of the stator 2 can be smaller, thereby reducing the size of the motor and improving the integration of the motor.

[0051] In some examples, reference Figure 4 As shown, when the motor also includes multiple fixing members 6, at least a portion of the multiple fixing members 6 corresponds one-to-one with at least a portion of the multiple third through holes 23, and the fixing members 6 are inserted through the corresponding third through holes 23.

[0052] For example, a portion of each of the multiple fasteners 6 could correspond one-to-one with a portion of each of the multiple third through holes 23. Figure 4 As shown, six of the eighteen fasteners 6 correspond one-to-one with six of the eighteen third through holes 23, the other six of the eighteen fasteners 6 correspond one-to-one with six of the eighteen independent first through holes 211, and the remaining six of the eighteen fasteners 6 correspond one-to-one with six of the eighteen independent second through holes 221.

[0053] Alternatively, each of the multiple fasteners 6 may correspond one-to-one with at least a portion of the multiple third through holes 23. For example, eighteen fasteners 6 may each correspond one-to-one with eighteen third through holes 23.

[0054] In this way, the fastener 6, which passes through the third through hole 23, can simultaneously fix the inner yoke 21 and the outer yoke 22, which helps to reduce manufacturing costs and improve the integration of the motor.

[0055] In some examples, the multiple first through holes 211, multiple second through holes 221, and multiple third through holes 23 through which the fastener 6 passes can be evenly distributed along the circumferential interval of the stator 2. This can improve the uniformity of the mechanical strength of the stator 2, which is beneficial to improving the stability of the motor operation.

[0056] In some examples, the shape of the radial section of the fastener 6 matches the radial section shape of the corresponding first through hole 211, second through hole 221, or third through hole 23. This helps to improve the stability of the stator 2.

[0057] For example, the radial cross-section of the first through hole 211, the second through hole 221, or the third through hole 23 can be circular, and the corresponding radial cross-section of the fixing part 6 is also circular. Alternatively, the radial cross-section of the first through hole 211, the second through hole 221, or the third through hole 23 can be rectangular, and the corresponding radial cross-section of the fixing part 6 is also rectangular. Yet another example is that the radial cross-section of the first through hole 211, the second through hole 221, or the third through hole 23 can be arc-shaped, and the corresponding radial cross-section of the fixing part 6 is also arc-shaped.

[0058] In some examples, at least a portion of the plurality of first through holes 211, plurality of second through holes 221 and plurality of third through holes 23 through which the fastener 6 passes are circular through holes.

[0059] For example, the plurality of first through holes 211, the plurality of second through holes 221, and the plurality of third through holes 23 through which the fastener 6 passes can all be circular through holes. Alternatively, some of the plurality of first through holes 211, the plurality of second through holes 221, and the plurality of third through holes 23 through which the fastener 6 passes can be circular through holes. In this way, the fastener 6 can be a bolt.

[0060] In this way, standard bolts can be selected, thereby saving design and manufacturing costs.

[0061] In some examples, the distance between the first end of the inner stator slot 201 and the first end of the outer stator slot 202 in the axial direction of the stator 2 is less than the distance between the second end of the inner stator slot 201 and the second end of the outer stator slot 202.

[0062] For example Figure 2 As shown, in the axial direction of the stator 2, the distance between the left end of the inner stator groove 201 and the left end of the outer stator groove 202 is less than the distance between the right end of the inner stator groove 201 and the right end of the outer stator groove 202.

[0063] In this way, other components of the hybrid gearbox, such as clutches or gear shafts, can be arranged at the second end of the outer rotor 5 and the outer stator slot 202, which can improve space utilization.

[0064] In some examples, reference Figure 2 As shown, along the axial direction of stator 2, the first end of the inner stator slot 201 is flush with the first end of the outer stator slot 202. For example, in Figure 2 In the middle, along the axial direction of stator 2, the left end of the inner stator groove 201 and the left end of the outer stator groove 202 can be flush.

[0065] In this way, the utilization rate of motor space can be greatly improved.

[0066] In some examples, reference Figure 5 and Figure 6 As shown, in the axial direction of stator 2, the distance between the first end of the inner stator slot 201 and the first end of the outer stator slot 202 is equal to the distance between the second end of the inner stator slot 201 and the second end of the outer stator slot 202. Thus, the structure formed by stator 2, inner rotor 1, and outer rotor 5 can be symmetrical in the axial direction. Therefore, during motor operation, it can avoid generating unilateral axial tension and increasing the axial load on the bearings, which is beneficial for improving the load capacity of the motor during operation.

[0067] In some examples, reference Figure 1 As shown, the motor also includes an inner rotor output shaft 11, which can pass through the inner rotor 1 along its axial direction. The inner rotor output shaft 11 is coaxially arranged with the inner rotor 1. The inner rotor output shaft 11 can be fixedly connected to the inner rotor 1 by bolts, welding, or other means. Thus, the inner rotor 1 can output power through the inner rotor output shaft 11 to generate electricity or drive the motor.

[0068] In some examples, reference Figure 1 As shown, the motor also includes an outer rotor output shaft 51, which can be annular and can surround the outer rotor 5, and is coaxial with the outer rotor 5. The outer rotor output shaft 51 can be fixedly connected to the outer rotor 5 by bolts, welding, or other means. Thus, the outer rotor 5 can output power through the outer rotor output shaft 51 to generate electricity or drive the motor.

[0069] In some examples, reference Figure 1 As shown, in order to ensure that the inner rotor 1 and the stator 2 can rotate freely relative to each other, an inner rotor air gap 12 is provided between the radial outer side of the inner rotor 1 and the stator 2.

[0070] In some examples, reference Figure 1 As shown, in order to ensure that the outer rotor 5 and the stator 2 can rotate freely relative to each other, an outer rotor air gap 52 is provided between the radial inner side of the outer rotor 5 and the stator 2.

[0071] Secondly, this embodiment also provides a vehicle, which includes any of the motors mentioned in the first aspect. The vehicle can be an electric vehicle or a hybrid vehicle, etc.

[0072] In the scheme disclosed herein, the internal magnetic field generated when current flows through the inner stator winding 3 can drive the inner rotor 1 to rotate, and the external magnetic field generated when current flows through the outer stator winding 4 can drive the outer rotor 5 to rotate. Furthermore, the axial dimension of the outer stator slot 202 is smaller than the axial dimension of the inner stator slot 201, making the axial dimension of the outer stator winding 4 smaller than the axial dimension of the inner stator winding 3. This reduces the space for the intersection of the internal and external magnetic fields, thereby reducing interference between the inner and outer magnetic circuits when the inner rotor 1 and outer rotor 5 operate independently.

[0073] Furthermore, since the outer diameter of the outer rotor 5 is larger than the inner diameter of the inner rotor 1, even if the axial dimension of the outer stator slot 202 is smaller than the axial dimension of the inner stator slot 201, the power output of the outer rotor 5 can reach the power output of the inner rotor 1, thus meeting the power output requirements of the motor.

[0074] It should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0076] In the description of this specification, the references to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples that are included in at least one embodiment or example of this application.

[0077] The above are merely embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. An electric machine characterized in that, The motor comprises an inner rotor (1), a stator (2), an inner stator winding (3), an outer stator winding (4) and an outer rotor (5); The stator (2) surrounds the inner rotor (1), the radially inner side of the stator (2) is provided with a plurality of inner stator slots (201), the radially outer side of the stator (2) is provided with a plurality of outer stator slots (202), the plurality of inner stator slots (201) and the plurality of outer stator slots (202) are all through the stator (2) along the axial direction of the stator (2), and the plurality of inner stator slots (201) and the plurality of outer stator slots (202) are spaced apart around the inner rotor (1) respectively; The inner stator winding (3) is wound on the plurality of inner stator slots (201); The outer stator winding (4) is wound on the plurality of outer stator slots (202); The outer rotor (5) surrounds the stator (2); The inner rotor (1), the stator (2) and the outer rotor (5) are coaxially arranged, and the axial dimension of the outer stator slot (202) is smaller than the axial dimension of the inner stator slot (201).

2. The electric machine of claim 1, wherein, The stator (2) comprises an inner yoke portion (21) and an outer yoke portion (22) arranged coaxially; The inner yoke portion (21) surrounds the inner rotor (1), the inner yoke portion (21) is provided with a plurality of first through holes (211), the plurality of first through holes (211) are all through the inner yoke portion (21) along the axial direction of the stator (2), and the plurality of first through holes (211) are all filled with magnetic isolation material; The plurality of inner stator slots (201) are arranged on the radially inner side of the inner yoke portion (21); The outer yoke portion (22) surrounds the inner yoke portion (21), the axial dimension of the outer yoke portion (22) is smaller than the axial dimension of the inner yoke portion (21), the outer yoke portion (22) is provided with a plurality of second through holes (221), the plurality of second through holes (221) are all through the outer yoke portion (22) along the axial direction of the stator (2), and the plurality of second through holes (221) are all filled with magnetic isolation material; The plurality of outer stator slots (202) are arranged on the radially outer side of the outer yoke portion (22); The plurality of first through holes (211) and the plurality of second through holes (221) are spaced apart around the inner rotor (1) respectively.

3. The electric machine of claim 2, wherein, The inner yoke portion (21) and the outer yoke portion (22) are integrally formed.

4. The electric machine of claim 2, wherein, At least part of the plurality of first through holes (211) and at least part of the plurality of second through holes (221) are distributed in a radial direction of the stator (2) in a staggered manner; Preferably, in the circumferential direction of the stator (2), the angle at which the plurality of first through holes (211) and the plurality of second through holes (221) overlap is not less than 360°.

5. The electric machine of claim 2, wherein, The motor further comprises a plurality of fixing members (6), at least part of the plurality of fixing members (6) corresponds to at least part of the plurality of first through holes (211) and at least part of the plurality of second through holes (221) one by one, and the fixing member (6) is arranged in the corresponding first through hole (211) or second through hole (221); Preferably, the fixing member (6) is made of magnetic isolation material.

6. An electrical machine according to any one of claims 2 to 5, characterised in that, At least part of the first through holes (211) are located radially outside the inner yoke (21), and at least part of the second through holes (221) are located radially inside the outer yoke (22); The first through holes (211) located radially outside the inner yoke (21) correspond to the second through holes (221) located radially inside the outer yoke (22) one by one, and the first through holes (211) and the corresponding second through holes (221) enclose the third through holes (23).

7. The electric machine of claim 6, wherein, When the motor further comprises a plurality of fixing members (6), at least part of the fixing members (6) correspond to at least part of the third through holes (23) one by one, and the fixing members (6) are arranged in the corresponding third through holes (23); Preferably, at least part of the first through holes (211), the second through holes (221) and the third through holes (23) in which the fixing members (6) are arranged are circular through holes, and the fixing members (6) are bolts.

8. The electric machine of claim 1, wherein, In the axial direction of the stator (2), the distance between the first end of the inner stator slot (201) and the first end of the outer stator slot (202) is less than the distance between the second end of the inner stator slot (201) and the second end of the outer stator slot (202). Preferably, in the axial direction of the stator (2), the first end of the inner stator slot (201) is flush with the first end of the outer stator slot (202).

9. The electric machine of claim 1, wherein, In the axial direction of the stator (2), the distance between the first end of the inner stator slot (201) and the first end of the outer stator slot (202) is equal to the distance between the second end of the inner stator slot (201) and the second end of the outer stator slot (202).

10. A vehicle characterized by comprising: The vehicle comprises the motor according to any one of claims 1 to 9.

Images