Motor, power system, and extended-range vehicle

Abstract

The present application relates to the technical field of new energy, and provides a motor, a power system, and an extended-range vehicle. The motor comprises a motor housing, an inner rotor, an inner stator, an outer stator, and an outer rotor; the inner rotor, the inner stator, the outer rotor, and the outer stator are all located in the motor housing, the inner stator is sleeved outside the inner rotor, the outer stator is sleeved outside the inner stator, and the outer rotor is sleeved outside the outer stator; the outer rotor is connected to an engine of a vehicle, and the inner rotor is configured for being in transmission connection with wheels of the vehicle. The motor integrates an electric motor together with an electric generator, offering a high level of integration. The highly integrated motor is packaged within a vehicle, which helps save vehicle packaging space and makes the arrangement of other components within the vehicle easier. The motor is applied to a rear-wheel drive extended-range vehicle, so as to turn the extended-range vehicle into a four-wheel drive vehicle. The four-wheel drive configuration has the advantages of a compact structure and low costs.

Description

Electric motors, powertrain systems, and range-extended vehicles

[0001] This application claims priority to Chinese Patent Application No. 202410816763.7, filed on June 21, 2024, entitled "Electric Motor, Power System and Range Extender Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of new energy technology, and in particular to an electric motor, a power system, and a range-extended vehicle. Background Technology

[0003] Range-extended electric vehicles (REEVs) are favored by the market because they combine the driving and handling characteristics of pure electric vehicles with the range advantage of gasoline vehicles, and have become an important branch of new energy vehicles.

[0004] Current range-extended electric vehicles (REEVs) require an electric motor to drive the wheels, a generator to generate electricity, and an engine (internal combustion engine) to power the generator. These components occupy a significant amount of space within the vehicle, making it difficult to arrange other structural components in REEVs. Summary of the Invention

[0005] This application provides an electric motor, a power system, and a range-extended vehicle. The electric motor integrates a generator and an electric motor, achieving a high degree of integration, which saves space in the vehicle and facilitates the placement of other components in the vehicle.

[0006] In a first aspect, this application provides an electric motor, which includes an electric motor housing, an inner rotor, an inner stator, an outer stator, and an outer rotor;

[0007] The inner rotor, the inner stator, the outer rotor, and the outer stator are all located in the motor housing, with the inner stator sleeved outside the inner rotor, the outer stator sleeved outside the inner stator, and the outer rotor sleeved outside the outer stator.

[0008] The outer rotor is used to connect to the engine of the vehicle, and the inner rotor is used to connect to the wheel drive of the vehicle.

[0009] In the solution shown in this application, the motor includes an inner motor formed by an inner rotor and an inner stator, and an outer motor formed by an outer rotor and an outer stator. The outer rotor is used for transmission connection with the engine, so the outer motor generates electricity under the drive of the engine, thus the outer motor acts as a generator. The inner rotor is used for transmission connection with the wheels, so the inner motor can drive the vehicle, thus the inner motor acts as a motor. It can be seen that this motor integrates the generator and the motor together, with a high degree of integration. The arrangement of a highly integrated motor in a vehicle is beneficial to saving vehicle layout space and facilitating the arrangement of other components in the vehicle. This highly integrated motor is particularly suitable for small vehicles.

[0010] Moreover, since the motor integrates a generator and an electric motor, and the generator needs to be driven by the engine, the generator and the engine are located close to each other. Since the engine is generally located at the front of the vehicle, such as in the front engine compartment, the motor is located at the front of the vehicle. Therefore, another electric motor can be located at the rear of the vehicle as a rear-drive motor, making the vehicle a four-wheel drive vehicle. This four-wheel drive configuration has the advantages of compact structure and low cost.

[0011] In one possible implementation, both the inner stator and the outer stator are fixed to the motor housing by heat fitting or bolts, with the stator winding of the inner stator facing the inner rotor and the stator winding of the outer stator facing the outer rotor.

[0012] In the solution shown in this application, the convex ring of the motor housing can be heat-fitted to the inner stator, and the outer stator can also be heat-fitted to the convex ring of the motor housing. Thus, the inner stator is fixed to the inner ring of the convex ring, and the outer stator is fixed to the outer ring of the convex ring. This heat-fitting method ensures sufficient interference fit between the inner and outer stators, resulting in high reliability.

[0013] In the scheme shown in this application, the outer stator forming the generator and the inner stator forming the motor are fixed to the motor housing by bolts. This fixing method is convenient for disassembly and facilitates modular assembly. Therefore, when the range-extended vehicle needs to be equipped with front-wheel drive in its power configuration, it is only necessary to assemble the inner rotor and inner stator inside the outer stator. When front-wheel drive is not required, it is not necessary to assemble the inner rotor and inner stator, or the assembled inner rotor and inner stator can be disassembled. This modular assembly method allows for flexible selection of whether to assemble based on the power configuration requirements.

[0014] In one possible implementation, the stator core of the inner stator has a plurality of first lugs protruding outward from the ring, the plurality of first lugs being arranged along the circumferential direction, and the stator core of the outer stator has a plurality of second lugs protruding inward from the ring, the plurality of second lugs being arranged along the circumferential direction.

[0015] The motor housing has a convex ring, the inner stator is located inside the convex ring, and the first lug is fixed to the convex ring by bolts. The outer stator is located outside the convex ring, and the second lug is fixed to the convex ring by bolts.

[0016] In the solution shown in this application, the first lug of the inner stator has a screw hole, and the convex ring of the motor housing has a screw hole, so that the inner stator is fixedly connected to the motor housing by bolts. The second lug of the outer stator has a screw hole, and the convex ring has a screw hole, so that the outer stator is fixedly connected to the motor housing by bolts. It can be seen that the fixing method between the inner stator and the motor housing, and between the outer stator and the motor housing, is simple, convenient for disassembly, and conducive to flexible adjustment of the vehicle's power configuration.

[0017] In one possible implementation, the magnets of the outer rotor are attached to the surface of the rotor body facing the outer stator.

[0018] In the solution shown in this application, the surface-mount permanent magnet has a higher utilization rate, better heat dissipation, and lower manufacturing cost compared with the embedded permanent magnet.

[0019] In one possible implementation, the outer rotor is connected to the engine of the vehicle via a gear train, or the outer rotor is directly connected to the crankshaft of the engine of the vehicle.

[0020] In one possible implementation, the motor further includes a motor controller, which is electrically connected to the stator windings of the inner stator and the stator windings of the outer stator, respectively.

[0021] In the solution shown in this application, the motor controller analyzes the vehicle's drive and power generation needs. When power generation is needed, it controls the outer rotor to start the engine. After the engine starts, it drives the outer rotor to rotate, causing the outer stator to output electrical energy to the battery pack. When drive is needed, it controls the inner rotor to rotate, driving the wheels to move.

[0022] In one possible implementation, the motor housing is made of silicon steel.

[0023] In the solution shown in this application, the motor housing is made of silicon steel. Silicon steel can shield the electromagnetic radiation generated by the high-voltage wiring harness inside the motor, and prevent the conductive thin plate of the vehicle body from vibrating and generating noise due to electromagnetic force.

[0024] In one possible implementation, the inner wall of the motor housing has a damping structure.

[0025] In the solution shown in this application, the inner wall of the motor housing has a damping structure, which further attenuates the vibration of the high-voltage wiring harness inside the motor and also reduces the vibration noise caused by the high-voltage wiring harness vibration being transmitted to the vehicle body through the fixed bracket.

[0026] Secondly, this application provides a power system including an engine and a motor as described in the first aspect, comprising an internal motor and an external motor, wherein the external rotor of the motor is drive-connected to the engine.

[0027] Thirdly, a range-extended vehicle is provided, the range-extended vehicle including the power system described in the second aspect, wherein the inner rotor of the power system is drive-connected to the wheels of the range-extended vehicle.

[0028] In one possible implementation, the range-extended vehicle further includes a rear-drive electric motor, which is drive-connected to the rear wheels of the range-extended vehicle, and the inner rotor of the motor is drive-connected to the front wheels of the range-extended vehicle.

[0029] In the solution shown in this application, the vehicle is arranged with a dual motor, including a generator and an electric motor, at the front, as described in the first aspect, and a rear-drive electric motor at the rear, making the vehicle a four-wheel drive vehicle. This four-wheel drive configuration has the advantages of compact structure and low cost. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the axial cross-section of a motor provided in an exemplary embodiment of this application;

[0031] Figure 2 is a schematic diagram of the radial cross-section of a motor provided in an exemplary embodiment of this application;

[0032] Figure 3 is a schematic diagram of the radial cross-section of a motor provided in an exemplary embodiment of this application.

[0033] Explanation of reference numerals in the attached drawings: 1. Motor housing; 11. Lug; 2. Inner rotor; 3. Inner stator; 31. First lug; 4. Outer stator; 41. Second lug; 5. Outer rotor; 10. Motor; 20. Engine; 30. Front wheel; 40. Gearbox; 50. Motor controller; 60. Battery pack. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0035] This embodiment relates to an electric motor that can be used in range-extended vehicles. A range-extended vehicle is a vehicle that adds an engine (also called an internal combustion engine) to charge the power battery or directly drive the electric motor to increase the driving range on the basis of a pure electric vehicle. Range-extended cars and range-extended electric vehicles are common types of range-extended vehicles.

[0036] Most current range-extended electric vehicles suffer from low integration and large space requirements. For example, in a front-wheel-drive range-extended sedan, the front of the vehicle must house the engine, generator, and electric motor. These components are relatively large, taking up considerable space in the front of the vehicle and hindering the placement of other components.

[0037] Therefore, most current range-extended electric vehicles are rear-wheel drive, with the electric motor located at the rear of the vehicle and the engine and generator located at the front, in order to save space.

[0038] This embodiment provides a motor, which is a dual motor that integrates a generator and a motor together. This highly integrated motor can be used in range-extended vehicles, especially in range-extended cars, to save space.

[0039] In addition, since the motor integrates a generator and an electric motor, and the generator needs to be driven by the engine, the generator and the engine are located close to each other. Since the engine is generally located at the front of the vehicle, such as in the front engine compartment, the motor is located at the front of the vehicle. Therefore, another electric motor can be located at the rear of the vehicle as a rear-drive motor, making the vehicle a four-wheel drive vehicle. This four-wheel drive configuration has the advantages of compact structure and low cost.

[0040] Furthermore, the motor is detachably mounted on the generator, meaning both the generator and the motor are disassembled. This allows for flexible configuration between a pure generator and a hybrid motor (combining a generator and a motor). For example, if the motor is used in a rear-wheel-drive range-extended vehicle, since there is already a motor driving the vehicle, the motor doesn't need to be mounted on the generator, making it a pure generator. Alternatively, the motor can be mounted on the generator, making it a hybrid motor for use in a range-extended vehicle, which would then be a four-wheel-drive vehicle. Conversely, if the motor is used in a front-wheel-drive range-extended vehicle, the motor needs to be mounted on the generator, making it a hybrid motor that includes both a generator and a motor.

[0041] The characteristics of the motor will be described below. It should be noted that, unless otherwise specified, all vehicles mentioned in this article refer to range-extended electric vehicles.

[0042] Figures 1 and 2 show the structural schematic diagrams of the power system. Figure 1 is a schematic diagram of the axial section of the power system, and Figure 2 is a schematic diagram of the radial section of the power system.

[0043] For a single motor, since a motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction, a single motor mainly consists of a stator and a rotor. The stator is stationary relative to the motor housing, while the rotor rotates relative to the motor housing. The stator includes a stator core and stator windings. The stator windings are wound around the stator core and are used for wiring.

[0044] The motor shown in this embodiment is a dual motor. Therefore, referring to Figure 1, the motor 10 includes a motor housing 1, two rotors and two stators. The two rotors and two stators are all installed in the same motor housing 1. The rotors are rotatably installed in the motor housing, while the stators are fixedly installed in the motor housing.

[0045] Referring to Figure 2, the rotor and stator are cylindrical in structure, with one rotor nested inside the other. For easy distinction, referring to Figure 1, the rotor on the outside is designated as the outer rotor 5, and the rotor on the inside is designated as the inner rotor 2. Similarly, the two stators are also one stator nested outside the other. For easy distinction, the stator on the outside is designated as the outer stator 4, and the stator on the inside is designated as the inner stator 3.

[0046] Referring again to Figures 1 and 2, the inner stator 3 and outer stator 4 form a stator assembly, located between the inner rotor 2 and the outer rotor 5. Referring to Figure 2, the stator windings of the inner stator 3 face the inner rotor 2, and the inner rotor 2 and inner stator 3 form one motor (denoted as the inner motor). Referring to Figure 2, the stator windings of the outer stator 4 face the outer rotor 5, and the outer stator 4 and outer rotor 5 form another motor (denoted as the outer motor).

[0047] Referring again to Figure 1, the outer rotor 5 is connected to the engine 20 via a transmission. Therefore, the outer motor formed by the outer rotor 5 and the outer stator 4 acts as a generator to generate electricity. The inner rotor 2 is connected to the wheels of the vehicle via a transmission. Therefore, the inner motor formed by the inner rotor 2 and the inner stator 3 acts as a motor (i.e., a drive motor) to drive the wheels.

[0048] Referring to Figure 1, the outer rotor 5 and outer stator 4 are located closer to the housing wall of the motor housing 1 than the inner rotor 2 and inner stator 3. Therefore, the outer rotor 5 and outer stator 4 have a larger heat dissipation space and better heat dissipation performance.

[0049] In one example, the outer rotor 5, located on the outermost layer, is well-suited for connection to the engine 20 for power generation. This is because, firstly, the outer rotor 5, being on the outermost layer, has a larger size and requires higher structural strength, resulting in a relatively low rotational speed. The generator used for power generation does not require a high speed, only a few thousand RPM, while the electric motor used for driving requires tens of thousands of RPM. Therefore, from a speed perspective, the relatively low-speed outer rotor 5 is more suitable for connection to the engine. Thus, the external motor formed by the outer rotor 5 and the outer stator 4 can function as a generator, connected to the engine 20 for power generation under the drive of the engine 20.

[0050] Secondly, the outer motor formed by the outer rotor 5 and outer stator 4 has a relatively large volume on the outer ring of the motor, and it can be made even larger. A larger motor provides better heat dissipation, which can increase operating power. Therefore, it is advantageous as a generator to increase power generation. On the other hand, the inner motor formed by the inner rotor 2 and inner stator 3 has a relatively small volume on the inner ring of the motor, and its size cannot be too large. A small inner motor has a small heat dissipation area and weaker heat dissipation effect, making it difficult to increase operating power. Therefore, if the inner motor formed by the inner rotor 2 and inner stator 3 is used as a generator, the increase in power generation will be limited. Thus, from the perspective of increasing power generation, the outer motor formed by the outer rotor 5 and outer stator 4 is more suitable as a generator, connected to the engine 20 for power generation.

[0051] In one example, the outer motor formed by the outer rotor 5 and the outer stator 4, acting as a generator, can have its dimensions determined according to the power generation requirements. For example, the pole slot dimensions, radial dimensions, and axial dimensions of the outer motor can be determined based on the power generation requirements. Similarly, the inner motor formed by the inner rotor 2 and the inner stator 3, acting as a motor, can have its dimensions determined according to the power requirements. For example, the axial and radial dimensions of the inner motor can be determined based on the power requirements.

[0052] In one example, the outer rotor 5 is connected to the engine 20, either directly or via the crankshaft drive of the engine 20. In another example, the outer rotor 5 can also be connected to the crankshaft drive of the engine 20 via a gear train for speed increase.

[0053] In one example, the inner rotor 2 is connected to the wheel drive. Since the engine is generally located in the front engine compartment, referring to Figure 1, the inner rotor 2 can be connected to the front wheel 30. For example, the inner rotor 2 is connected to the front wheel 30 via a gearbox 40. Referring to Figure 1, the shaft of the inner rotor 2 is connected to the gearbox 40, and the gearbox 40 is connected to the shaft of the front wheel 30.

[0054] In one example, the inner motor formed by the inner rotor 2 and the inner stator 3, and the outer motor formed by the outer rotors 5 and 4, can both be permanent magnet synchronous motors. Permanent magnet synchronous motors have the advantages of simple structure, small size, high efficiency, and high power factor.

[0055] Depending on the location of the permanent magnets on the rotor, permanent magnet synchronous motors are generally classified into surface rotor structures and built-in rotor structures.

[0056] In one example, considering that the rotational speed of the outer rotor 5 is relatively low, generally not exceeding 5000 rpm, the permanent magnets of the outer rotor 5 can be surface-mounted. For example, the magnets of the outer rotor 5 can be attached to the surface of the rotor body facing the outer stator 4. Thus, the outer motor formed by the outer rotor 5 and the outer stator 4 is specifically a surface-mounted permanent magnet synchronous motor. Compared with embedded permanent magnets, this surface-mounted permanent magnet design offers higher magnet utilization, better heat dissipation, and lower manufacturing costs.

[0057] In one example, because the inner rotor 2 rotates at a high speed, the permanent magnet of the inner rotor 2 can be embedded, that is, the magnet of the inner rotor 2 is embedded in the rotor body.

[0058] In one example, the inner stator 3 and the outer stator 4 can be fixed to the motor housing 1 by bolts, or the inner stator 3 and the outer stator 4 can also be fixed to the motor housing 1 by heat fitting.

[0059] For example, after the stator core of the inner stator 3 has completed the nested winding and insulation treatment, it can be fixedly connected to the motor housing 1 by bolts or heat sleeves. Similarly, after the stator core of the outer stator 4 has completed the nested winding and insulation treatment, it can also be fixedly connected to the motor housing 1 by bolts or heat sleeves.

[0060] Among them, thermal fitting is a fixing method that uses the principle of thermal expansion and contraction to achieve interference fit. Because thermal fitting involves heating and expanding the containing part and then cooling it, the containing part contracts to wrap around the contained part, which can ensure sufficient interference value and high reliability.

[0061] As an example, the process of assembling the inner stator 3 and the outer stator 4 onto the motor housing 1 by means of a heat fitting can be as shown in Figure 3, which is a schematic diagram of the inner stator 3 and the outer stator 4 being assembled onto the motor housing by means of a heat fitting. Referring to Figure 3, the convex ring 11 of the motor housing 1 (i.e., the part shown by the line filling in Figure 3) serves as an enclosing element, and the stator core of the inner stator 3 serves as the enclosed element. In the fixing process, the convex ring 11 is heated to expand it. The convex ring 11 in the expanded state encloses the stator core of the inner stator 3. Then, the convex ring 11 is cooled, and the cooled convex ring 11 contracts, thereby tightly wrapping the stator core of the inner stator 3.

[0062] Similarly, the process of fixing the outer stator 4 can be as follows: the outer stator 4 acts as an enclosure and the convex ring 11 acts as the enclosure. During fixing, the outer stator 4 is heated to make it expand. In the expanded state, the outer stator 4 is enclosed outside the convex ring 11. Then, the outer stator 4 is cooled. After cooling, the outer stator 4 shrinks, thereby tightly wrapping the convex ring 11.

[0063] As another example, both the inner stator 3 and the outer stator 4 are fixedly connected to the motor housing 1 by bolts. Referring to Figure 2, the stator core of the inner stator 3 has multiple first lugs 31 protruding outward from the ring. The multiple first lugs 31 are arranged along the circumferential direction, such as multiple first lugs 31 evenly arranged along the circumferential direction. Figure 2 shows two examples. Continuing to refer to Figure 2, each first lug 31 has a screw hole.

[0064] Similarly, referring to Figure 2, the stator core of the outer stator 4 also has multiple second lugs 41 protruding into the inner ring. These multiple second lugs 41 are arranged along the circumferential direction, such as two lugs evenly arranged along the circumferential direction in Figure 2. Continuing to refer to Figure 2, each second lug 41 has a screw hole.

[0065] Referring to Figure 2, the motor housing 1 has a convex ring 11, which also has multiple screw holes. The inner stator 3 is located inside the convex ring 11. The screw holes of the first lug 31 are aligned with the screw holes of the convex ring 11, and the two are fixed by bolts. The outer stator 4 is located outside the convex ring 11. The screw holes of the second lug 41 are aligned with the screw holes of the convex ring 11, and the two are fixed by bolts.

[0066] This assembly method, in which the inner stator 3 and outer stator 4 are fixed to the motor housing 1 with bolts, allows the outer motor formed by the outer rotor 5 and outer stator 4 to be detached from the inner motor formed by the inner rotor 2 and inner stator 3, facilitating modular assembly. For example, in a power configuration, if the inner motor needs to be assembled, the inner rotor 2 and inner stator 3 only need to be assembled inside the outer stator 4; if the inner motor is not needed, the inner rotor 2 and inner stator 3 do not need to be assembled. Therefore, the motor shown in this embodiment allows for flexible selection of whether or not to assemble the inner rotor 2 and inner stator 3 according to the power configuration requirements.

[0067] In one example, referring to Figure 1, the motor also includes a motor controller 50. The inner motor, formed by the inner rotor 2 and the inner stator 3, shares the motor controller 50 with the outer motor, formed by the outer rotor 5 and the outer stator 4. For example, referring to Figure 1, the motor controller 50 is electrically connected to both the stator windings of the inner stator 3 and the stator windings of the outer stator 4. The motor controller 50 is also electrically connected to the battery pack 60, and the motor controller 50 analyzes the vehicle's drive and power generation needs.

[0068] For example, referring to Figure 1, when the engine 20 starts, the external motor formed by the outer stator 4 and the outer rotor 5 acts as a starter motor, driving the engine 20 to start. Subsequently, the engine 20 operates, driving the external motor to generate electricity, which flows into the battery pack 60 via the motor controller 50. The battery pack 60 supplies power to the inner stator 3, causing the inner rotor 2 to rotate. The rotation of the inner rotor 2 drives the front wheels 30 to move.

[0069] In one example, the motor housing 1 can be made of silicon steel. Silicon steel can shield the electromagnetic radiation generated by the high-voltage wiring harness inside the motor 10, preventing the conductive thin plate of the vehicle body from vibrating and generating noise due to electromagnetic force.

[0070] In one example, to further reduce noise, the inner wall of the motor housing 1 has a damping structure to further attenuate the vibration of the high-voltage wiring harness inside the motor, and also reduce the vibration noise caused by the high-voltage wiring harness vibration being transmitted to the vehicle body through the fixed bracket.

[0071] In this embodiment, the motor includes an inner motor formed by an inner rotor and an inner stator, and an outer motor formed by an outer rotor and an outer stator. The outer rotor is used for transmission connection with the engine, so the outer motor generates electricity under the drive of the engine, thus the outer motor acts as a generator. The inner rotor is used for transmission connection with the wheels, so the inner motor can drive the vehicle, thus the inner motor acts as a motor. It can be seen that this motor integrates the generator and the motor together, with a high degree of integration. The arrangement of a highly integrated motor in a vehicle is beneficial to saving vehicle layout space and facilitating the arrangement of other components in the vehicle. This highly integrated motor is particularly suitable for small vehicles.

[0072] Moreover, the motor uses the outer motor located on the outside as a generator and the inner motor located on the inside as a motor, which helps to improve the generator's power generation efficiency.

[0073] Since the motor integrates a generator and an electric motor, and the generator needs to be driven by the engine, the generator and the engine are located close to each other. The engine is usually located at the front of the vehicle, such as in the front engine compartment. Therefore, the motor is located at the front of the vehicle, and another electric motor can be located at the rear of the vehicle as a rear-drive motor, making the vehicle a four-wheel drive vehicle. This four-wheel drive configuration has the advantages of compact structure and low cost.

[0074] Furthermore, the design of mounting the inner and outer stators onto the motor housing with bolts allows for detachment between the inner and outer motors. Therefore, in applications where the inner motor needs to be mounted, only the inner rotor and inner stator need to be mounted inside the outer stator. If the inner motor is not required, then the inner rotor and inner stator do not need to be mounted. Thus, the motor shown in this embodiment allows for flexible selection of whether or not to mount the inner rotor and inner stator based on power configuration requirements.

[0075] This application embodiment also provides a power system. Referring to FIG1, the power system includes an engine 20 and a motor 10, which includes an inner motor and an outer motor as described above. The outer rotor 5 of the motor 10 is connected to the engine 20 in a transmission connection, and the inner rotor 2 of the motor 10 is connected to the wheels of the vehicle in a transmission connection.

[0076] In this embodiment of the application, the motor of the power system, as described above, consists of an inner motor formed by an inner rotor and an inner stator, and an outer motor formed by an outer rotor and an outer stator. The outer rotor is used for transmission connection with the engine, so the outer motor generates electricity under the drive of the engine, thus the outer motor acts as a generator. The inner rotor is used for transmission connection with the wheels, so the inner motor can drive the vehicle, thus the inner motor acts as a motor. It can be seen that this motor integrates the generator and the motor together, with a high degree of integration. The arrangement of a highly integrated motor in a vehicle is beneficial to saving vehicle layout space and facilitating the arrangement of other components in the vehicle. Such a highly integrated motor is particularly suitable for small vehicles.

[0077] Moreover, since the motor integrates a generator and an electric motor, and the generator needs to be driven by the engine, the generator and the engine are located close to each other. Since the engine is generally located at the front of the vehicle, such as in the front engine compartment, the motor is located at the front of the vehicle. Therefore, another electric motor can be located at the rear of the vehicle as a rear-drive motor, making the vehicle a four-wheel drive vehicle. This four-wheel drive configuration has the advantages of compact structure and low cost.

[0078] Furthermore, the design of mounting the inner and outer stators onto the motor housing with bolts allows for detachment between the inner and outer motors. Therefore, in applications where the inner motor needs to be mounted, only the inner rotor and inner stator need to be mounted inside the outer stator. If the inner motor is not required, then the inner rotor and inner stator do not need to be mounted. Thus, the motor shown in this embodiment allows for flexible selection of whether or not to mount the inner rotor and inner stator based on power configuration requirements.

[0079] This application also provides a range-extended vehicle, including the power system described above, wherein the wheels of the range-extended vehicle are connected to the inner rotor of the power system via a drive connection. For example, the half-shafts of the front wheels of the range-extended vehicle are connected to the inner rotor via a drive connection.

[0080] In one example, the range-extended vehicle can be a four-wheel drive model. In this case, the range-extended vehicle also includes a rear-drive electric motor, which is connected to the half-shaft of the rear wheel, and the inner rotor of the power system is connected to the half-shaft of the front wheel.

[0081] In this embodiment of the application, the range-extended vehicle has an integrated motor with an engine and an electric motor at the front wheels and a rear-drive electric motor at the rear wheels, achieving a four-wheel drive configuration. This four-wheel drive configuration has the advantages of compact structure and low cost.

[0082] Furthermore, the outer stator forming the generator and the inner stator forming the motor are fixed to the motor housing with bolts. This fixing method is easy to disassemble and facilitates modular assembly. Therefore, when the range-extended vehicle needs to be equipped with front-wheel drive in its power configuration, it is only necessary to assemble the inner rotor and inner stator inside the outer stator. When front-wheel drive is not required, it is not necessary to assemble the inner rotor and inner stator, or the assembled inner rotor and inner stator can be disassembled. This modular assembly method allows for flexible selection of whether to assemble based on the power configuration requirements.

[0083] The terminology used in the embodiments section of this application is for explaining the embodiments of this application only and is not intended to limit this application. Unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, the terms "a" or "one," etc., do not indicate a quantity limitation, but indicate the presence of at least one. The terms "comprising," "including," etc., mean that the elements or objects preceding "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are only used to indicate relative positional relationships, and the relative positional relationship may also change accordingly when the absolute position of the described object changes. "A plurality of" means two or more, unless otherwise expressly defined.

[0084] The above description is merely an optional embodiment of this application and is 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 includes a motor 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 rotor (5) and the outer stator (4) are all located in the motor housing (1), and the inner stator (3) is sleeved outside the inner rotor (2), the outer stator (4) is sleeved outside the inner stator (3), and the outer rotor (5) is sleeved outside the outer stator (4); The outer rotor (5) is used for transmission connection with the engine (20) of the vehicle, and the inner rotor (2) is used for transmission connection with the wheels of the vehicle.

2. The electric machine of claim 1, wherein, The inner stator (3) and the outer stator (4) are both fixed to the motor housing (1) by heat fitting or bolts, and the stator winding of the inner stator (3) faces the inner rotor (2), while the stator winding of the outer stator (4) faces the outer rotor (5).

3. The electric machine of claim 2, wherein, The stator core of the inner stator (3) has a plurality of first lugs (31) protruding outward from the ring, and the plurality of first lugs (31) are arranged along the circumferential direction. The stator core of the outer stator (4) has a plurality of second lugs (41) protruding inward from the ring, and the plurality of second lugs (41) are arranged along the circumferential direction. The motor housing (1) has a convex ring (11), the inner stator (3) is located inside the convex ring (11), and the first lug (31) is fixed to the convex ring (11) by bolts. The outer stator (4) is located outside the convex ring (11), and the second lug (41) is fixed to the convex ring (11) by bolts.

4. The electric machine of any one of claims 1 to 3, characterized in that The magnets of the outer rotor (5) are attached to the surface of the rotor body facing the outer stator (4).

5. The motor according to any one of claims 1 to 4, characterized in that, The outer rotor (5) is connected to the engine (20) of the vehicle via a gear system, or the outer rotor (5) is directly connected to the crankshaft of the engine (20) of the vehicle.

6. The motor according to any one of claims 1 to 5, characterized in that, The motor also includes a motor controller (50), which is electrically connected to the stator winding of the inner stator (3) and the stator winding of the outer stator (4).

7. The motor according to any one of claims 1 to 6, characterized in that, The motor housing (1) is made of silicon steel.

8. The motor according to any one of claims 1 to 7, characterized in that, The inner wall of the motor housing (1) has a damping structure.

9. A power system, characterized in that, The power system includes an engine (20) and a motor (10) according to any one of claims 1 to 8, wherein the outer rotor (5) of the motor (10) is connected to the engine (20) in a transmission manner.

10. A vehicle, characterized in that, The vehicle includes the power system of claim 9, wherein the inner rotor (2) of the power system is connected to the wheels of the vehicle in a drive connection.

11. The vehicle according to claim 10, characterized in that, The vehicle also includes a rear-drive motor, which is connected to the rear wheels of the vehicle, and the inner rotor (2) of the power system is connected to the front wheels of the vehicle.

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