Electric machine, power system and method for controlling the same, vehicle

Abstract

This application provides an electric motor, a power system, a control method thereof, and a vehicle, relating to the field of vehicle technology. The electric motor includes an inner rotor, a stator assembly, and an outer rotor. The stator assembly includes an inner stator core and an outer stator core fixed to each other. The inner stator core is fitted onto the inner rotor, and the outer stator core is fitted onto the inner stator core. The axial length of the inner stator core is different from the axial length of the outer stator core. The outer rotor is fitted onto the outer stator core. One of the inner and outer rotors is used for transmission connection with the vehicle's engine, and the other is used for transmission connection with the vehicle's wheels. The electric motor provided in this application integrates a generator and an electric motor, which helps save vehicle layout space and reduce weight. Furthermore, the inner and outer stator cores can have different axial lengths in the motor to meet different torque and power requirements for power generation and driving.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to an electric motor, a power system and its control method, and a vehicle. Background Technology

[0002] The power system of range-extended or hybrid vehicles requires an electric motor to drive the wheels, a generator to generate electricity, and an engine (i.e., an internal combustion engine) to drive the generator. These devices occupy a large space in the vehicle, resulting in a larger weight and size for range-extended vehicles. Summary of the Invention

[0003] This application provides a motor, power system and control method thereof, and vehicle that can reduce the volume and weight occupied.

[0004] In a first aspect, one embodiment of this application provides an electric motor, the electric motor comprising: Internal rotor; The stator assembly includes an inner stator core and an outer stator core that are fixed to each other. The inner stator core is sleeved on the inner rotor, and the outer stator core is sleeved on the inner stator core. The axial length of the inner stator core is different from the axial length of the outer stator core. The outer rotor is fitted onto the outer stator core. One of the inner and outer rotors is used for transmission connection with the vehicle's engine, and the other of the inner and outer rotors is used for transmission connection with the vehicle's wheels.

[0005] The motor provided in this application comprises an inner rotor and an inner stator core forming an inner motor, and an outer rotor and an outer stator core forming an outer motor. One of the inner and outer rotors can be connected to an engine, and the motor connected to the engine generates electricity under the engine's drive, functioning as a generator. The other of the inner and outer rotors can be connected to a wheel to drive the vehicle. This motor integrates a generator and a motor, which helps save vehicle layout space and reduce weight. Furthermore, the inner and outer stator cores can have different lengths along the motor's axial direction to meet different requirements for power generation, driving torque, and power.

[0006] According to the first aspect, in one possible implementation, an air gap is formed between the outer wall of the inner stator core and the inner wall of the outer stator core.

[0007] In this possible implementation, the air gap is used for magnetic isolation. The inner stator core and the outer stator core are magnetically isolated through the air gap, rather than by setting up a dedicated magnetic isolation component. This helps to reduce interference between the inner stator core and the outer stator core, while also simplifying the motor structure and reducing the motor weight.

[0008] According to the first aspect, in one possible implementation, a plurality of supports are provided between the outer wall of the inner stator core and the inner wall of the outer stator core, each support being fixedly connected between the outer wall of the inner stator core and the inner wall of the outer stator core, and the plurality of supports being distributed at intervals along the circumference of the motor.

[0009] In this possible implementation, the first iron core and the second iron core are fixedly connected together by multiple supports to form an integrated structure, which helps to simplify the motor structure.

[0010] According to the first aspect, in one possible implementation, the inner stator core, the support, and the outer stator core are integrally formed.

[0011] In this possible implementation, the inner stator core, outer stator core, and support can be formed as a single unit through a stamping process, which helps to improve the connection stability and reliability between the inner stator core, support, and outer stator core.

[0012] According to the first aspect, in one possible implementation, the motor further includes a housing fitted over the outer rotor, and at least one of the inner stator core and the outer stator core is fixedly connected to the housing by fasteners.

[0013] In this possible implementation, there is no need to set up additional brackets to support the inner and outer stator cores. At least one of the inner stator core and the outer stator core is fixedly connected to the housing by fasteners, which helps to reduce the size of the motor.

[0014] Secondly, this application provides a power system including an engine and an electric motor in any possible implementation of the first aspect, wherein one of the inner rotor and the outer rotor is connected to the engine.

[0015] The power system provided in this application includes an internal motor and an external motor with a shared stator, which helps to reduce the size and weight of the power system.

[0016] According to the second aspect, in one possible implementation, the power system further includes a first transmission structure, through which one of the inner rotor and the outer rotor is connected to the engine.

[0017] In this possible implementation, the first transmission structure is connected between the engine and the motor, thereby increasing the gear ratio of the power system and improving the power density.

[0018] According to the second aspect, in one possible implementation, the first transmission structure includes a sun gear, planet gears and a planet carrier, one of the inner rotor and the outer rotor is connected to the sun gear, the planet gears mesh with the sun gear, the planet carrier is connected to the planet gears, and the engine is connected to the planet carrier.

[0019] In this possible implementation, the transmission connection between the motor and the engine is achieved through a planetary gear set, and the motor and engine can be set coaxially, which is beneficial to the compact structure of the power system.

[0020] According to the second aspect, in one possible implementation, the first transmission structure includes a first gear and a second gear, one of the inner rotor and the outer rotor is connected to the first gear, the second gear is meshed with the first gear, and the engine is connected to the second gear.

[0021] In this possible implementation, the engine's power can be directly transmitted to the motor via the first and second gears, resulting in high transmission efficiency. Furthermore, the motor's axis can be parallel to the engine's axis; the parallel-shaft gear structure is simple in design, has a mature manufacturing process, and offers strong load-bearing capacity.

[0022] According to the second aspect, in one possible implementation, the power system also includes a clutch for engaging or disengaging the transmission connection between the engine and the electric motor.

[0023] In this possible implementation, the transmission connection between the engine and the electric motor is controlled by a clutch, thereby improving operating efficiency.

[0024] According to the second aspect, in one possible implementation, the power system also includes a differential, with the other of the inner and outer rotors connected to the differential, the differential being used to connect to the wheels and to transmit power to the wheels.

[0025] Thirdly, one embodiment of this application provides a control method for a power system. The power system includes an engine and an electric motor. The electric motor includes an inner rotor, a stator assembly, and an outer rotor. The stator assembly includes an inner stator core and an outer stator core that are fixed to each other. The inner stator core is sleeved on the inner rotor, and the outer stator core is sleeved on the inner stator core. The axial length of the inner stator core is different from the axial length of the outer stator core. The outer rotor is sleeved on the outer stator core. One of the inner rotor and the outer rotor is a first rotor, and the other of the inner rotor and the outer rotor is a second rotor. The first rotor is connected to the engine, and the second rotor is used to connect to the wheels of the vehicle. The control method includes: controlling the electric system to enter a charging mode, whereby the engine drives the first rotor to rotate; and / or, controlling the electric system to enter a motor drive mode, whereby the second rotor is controlled to rotate.

[0026] The control method provided in this application can switch the power system to work in different working modes according to the application scenario, which facilitates its use.

[0027] Fourthly, one embodiment of this application provides a vehicle, the vehicle including wheels and a power system as described in the second aspect, wherein another of an inner rotor and an outer rotor is drive-connected to the wheels. Attached Figure Description

[0028] Figure 1 A schematic diagram of a vehicle provided for one embodiment of this application; Figure 2 A schematic diagram illustrating the connection between a power system and wheels according to one embodiment of this application; Figure 3 A schematic diagram illustrating the connection between a power system and wheels according to one embodiment of this application; Figure 4 This is a partial structural schematic diagram of a stator assembly provided in one embodiment of this application; Figure 5 A schematic diagram illustrating the connection between a power system and wheels according to one embodiment of this application; Figure 6 A schematic diagram illustrating the connection between a power system and wheels according to one embodiment of this application; Figure 7 This is a partial structural block diagram of a vehicle provided in one embodiment of this application.

[0029] Explanation of reference numerals in the attached figures 1-Vehicle; 10-Wheel; 30-Power system; 31-Motor; 311-Inner rotor; 313-Stator assembly; 3131-Inner stator core; 3132-Outer stator core; 3133-Air gap; 3134-Support; 3135-First winding; 3137-Second winding; 315-Outer rotor; 316-Input shaft; 317-Output shaft; 318-Housing; 319-Fastener; 32-Engine; 33-Clutch; 34-First transmission structure; 341-First gear; 342-Second gear; 343-Planet carrier; 344-Planet gears; 345-Sun gear; 35-Second transmission structure; 351-Third gear; 352-Fourth gear; 353-Fifth gear; 354-Sixth gear; 36-Differential; 50-Battery pack; 60-Controller. Detailed Implementation

[0030] Transmission connection refers to the physical connection and combination between a series of mechanical components in a power system that transmit power from a power source (such as an engine or electric motor) to actuators (such as wheels or working mechanisms). The purpose of transmission connection is to transmit power, change speed and torque, and ultimately drive the vehicle or equipment. In the automotive field, transmission connection specifically refers to the connection relationship and power transmission path between various components in the transmission system (such as clutches, gearboxes, drive shafts, final drive, differentials, half shafts, etc.).

[0031] Speed ​​ratio: This is the ratio of the angular velocities of two rotating components in a mechanism, also known as the transmission ratio. For example, the transmission ratio between the first gear and the second gear is the ratio of the angular velocity of the first gear to the angular velocity of the second gear.

[0032] Please see Figure 1 This application provides a vehicle 1 in one embodiment. The vehicle 1 includes wheels 10 and a power system 30, which transmits power to the wheels 10. The vehicle 1 can be a range-extended electric vehicle (REEV). A range-extended electric vehicle is a vehicle 1 that increases its range by adding an engine (also called an internal combustion engine) to charge the power battery or directly drive the electric motor, based on a pure electric vehicle. Range-extended electric vehicles and range-extended electric cars are common types of range-extended vehicles. This application does not limit the type of vehicle 1. In some possible implementations, the vehicle 1 can also be a plug-in hybrid electric vehicle, etc. For example, the wheels 10 include front wheels and rear wheels, and the half-shafts of the front wheels of the vehicle 1 are connected to the power system 30 for transmission. It is understood that the vehicle 1 can also include other necessary or non-essential structures, such as a vehicle body, etc., which will not be elaborated here.

[0033] In one example, the vehicle 1 can be a four-wheel drive model. In this case, the vehicle 1 may further include a rear-drive electric motor, which is connected to the half-shaft of the rear wheel 10. The power system 30 can be connected to the half-shaft of the front wheel 10. In this embodiment, the vehicle 1 has the power system 30 located at the front wheel 10 and the rear-drive electric motor located at the rear wheel 10, achieving a four-wheel drive configuration. This four-wheel drive configuration provides excellent traction and enhances the driving stability and safety of the vehicle 1.

[0034] Please see Figure 2 This application provides a power system 30, which includes a motor 31 and an engine 32. The motor 31 includes an inner rotor 311, a stator assembly 313, and an outer rotor 315. The stator assembly 313 includes an inner stator and an outer stator. The inner stator includes an inner stator core 3131 and a first winding 3135. The outer stator includes an outer stator core 3132 and a second winding 3137. The inner stator core 3131 and the outer stator core 3132 are fixed together. The inner stator core 3131 is sleeved on the inner rotor 311, and the outer stator core 3132 is sleeved on the inner stator core 3131. The first winding 3135 is located on the inner wall of the inner stator core 3131 and faces the inner rotor 311, while the second winding 3137 is located on the outer wall of the outer stator core 3132 and faces the outer rotor 315. The axial length of the inner stator core 3131 is different from the axial length of the outer stator core 3132. The outer rotor 315 is sleeved on the outer stator core 3132, the inner rotor 311 is connected to the engine 32, and the outer rotor 315 is used to connect to the wheel 10 of the vehicle 1.

[0035] The motor 31 provided in this application comprises an inner rotor 311 and an inner stator core 3131 to form an inner motor 31, and an outer rotor 315 and an outer stator core 3132 to form an outer motor 31. The inner rotor 311 can be connected to the engine 32, meaning the inner motor 31 generates electricity under the drive of the engine 32 and is used as the motor 31. The outer rotor 315 can be connected to the wheel 10 to drive the vehicle 1. This motor 31 integrates the motor 31 and the electric motor, which helps save space in the vehicle 1 and reduces weight. In addition, the inner and outer stator cores 3132 can have different lengths along the axial direction of the motor 31 to meet different requirements for power generation, driving torque, and power.

[0036] Most current range-extended electric vehicles suffer from low integration and large space requirements. For example, in front-wheel-drive range-extended sedans, the engine, generator, and electric motor must all be located at the front. These components are relatively large, occupying significant space in the front of the vehicle and hindering the placement of other components. Therefore, most current range-extended sedans are rear-wheel drive, placing the electric motor at the rear and the engine and generator at the front to save space.

[0037] This application provides a motor 31 that integrates a motor 31 and an electric motor together, with a high degree of integration. This highly integrated motor 31 can be used in range-extended vehicles 1, especially in range-extended passenger cars, to save layout space.

[0038] In addition, since the motor 31 integrates the motor 31 and the electric motor, and the motor 31 needs to be driven by the engine 32, the motor 31 and the engine 32 are located close to each other. The engine 32 is generally located at the front of the vehicle 1, such as in the front engine compartment. Therefore, the motor 31 is located at the front of the vehicle 1. Then, another electric motor can be arranged at the rear of the vehicle 1 as a rear drive electric motor, making the vehicle 1 a four-wheel drive vehicle 1. This four-wheel drive configuration has the advantages of compact structure and low cost.

[0039] This configuration employs internal and external rotor motors, coaxially arranged, serving as the generator and drive motor respectively, achieving an extremely compact space and weight, while significantly increasing power density. Compared to current mainstream hybrid gearbox structures, it offers higher space utilization, smaller size, and easier vehicle layout, greatly saving space in the width, length, and height directions of the vehicle. This configuration provides comparable functionality to mainstream hybrid gearboxes, but with significantly reduced cost and weight.

[0040] The motor 31 may also include a housing 318. The housing 318 is fitted onto the outer rotor 315. At least one of the inner stator core 3131 and the outer stator core 3132 is fixedly connected to the housing 318 by fasteners 319. The fasteners 319 can be screws or bolts. The stator assembly 313 is fixed to the housing 318 by the fasteners 319. This fixing method facilitates disassembly and modular assembly.

[0041] The housing 318 can be made of silicon steel. Silicon steel can shield the electromagnetic radiation generated by the high-voltage wiring harness inside the motor 31, and prevent the conductive thin plate of the vehicle body from vibrating and generating noise due to electromagnetic force.

[0042] The power system 30 may further include a clutch 33, a first transmission structure 34, a second transmission structure 35, and a differential 36. The clutch 33 is connected between the engine 32 and the first transmission structure 34. The clutch 33 is used to engage or disengage the transmission connection between the engine 32 and the electric motor 31. The second transmission structure 35 is connected between the outer rotor 315 and the differential 36, and the differential 36 is connected between the second transmission structure 35 and the wheels 10. The differential 36 is used to transmit power to the wheels 10.

[0043] The clutch 33 can include a disengaged state and an engaged state. When the clutch 33 is in the disengaged state, the transmission connection between the engine 32 and the motor 31 is broken, and the power of the engine 32 cannot be transmitted to the motor 31. When the clutch 33 is in the engaged state, the transmission connection between the engine 32 and the motor 31 is engaged, and the power of the engine 32 can be transmitted to the motor 31. The clutch 33 can be omitted, and the power output and shutdown of the engine 32 can be directly achieved by controlling the starting and stopping of the engine 32. The clutch 33 can be located between the inner rotor 311 and the engine 32.

[0044] This application does not limit the type of clutch 33. For example, clutch 33 can be one of friction clutch, hydraulic coupling, electromagnetic clutch, and magnetic powder clutch.

[0045] The inner rotor 311 is connected to the engine 32 via a first transmission structure 34. The first transmission structure 34 connects the engine 32 and the motor 31, increasing the gear ratio of the power system 30 and thus improving its power density. In some embodiments of this application, the first transmission structure 34 includes a first gear 341 and a second gear 342. The inner rotor 311 is connected to the first gear 341, the second gear 342 is meshed with the first gear 341, and a clutch 33 is connected between the second gear 342 and the engine 32. The power of the engine 32 can be directly transmitted to the motor 31 via the first gear 341 and the second gear 342, resulting in high transmission efficiency. The motor 31 may also include an input shaft 316 and an output shaft 317. The input shaft 316 connects the first gear 341 and the outer rotor 315, and the output shaft 317 can be connected between the third gear 351 and the inner rotor 311. The input shaft 316 and output shaft 317 are coaxially arranged, and the input shaft 316 is parallel to the axis of the engine 32. In other words, the axis of the motor 31 can be parallel to the axis of the engine 32. The parallel shaft gear structure is simple in structure, mature in manufacturing process, and has strong load-bearing capacity. A power system 30 without a gear transmission structure would require a longer stator assembly 313, inner rotor 311, and outer rotor 315 along the axis of the motor 31 to achieve the same torque as a system with a gear transmission structure. By using a gear transmission structure, the length of the stator assembly 313, inner rotor 311, and outer rotor 315 along the axis of the motor 31 can be reduced. In some possible embodiments, the clutch 33 can be omitted, and the first transmission structure 34 connects the engine 32 and the inner rotor 311. For example, the second gear 342 can be directly connected to the engine 32. The hybrid gearbox architecture using the inner and outer rotors 315 and the motor 31 employs the outer rotor 315 for driving and the inner rotor 311 for power generation, while also being connected to the engine 32 via a parallel shaft. The inner and outer stators can be stacked with different lengths to meet the different torque and power requirements for power generation and driving.

[0046] This application does not limit the specific structure of the first transmission structure 34, for example, as Figure 3 As shown, in some embodiments, the first transmission structure 34 includes a sun gear 345, planet gears 344, and a planet carrier 343. The inner rotor 311 is connected to the sun gear 345, the planet gears 344 mesh with the sun gear 345, the planet carrier 343 is connected to the planet gears 344, and the engine 32 is connected to the planet carrier 343. The transmission connection between the motor 31 and the engine 32 is achieved through a planetary gear set. The motor 31 and the engine 32 can be coaxially arranged, which is beneficial to the compact structure of the power system 30. A hybrid gearbox architecture with inner and outer rotors 315 and motor 31 is adopted, with the inner rotor 311 generating electricity and the outer rotor 315 driving the engine, while being connected to the engine 32 via a planetary gear set. The inner and outer stators can adopt different stack lengths to meet different torque and power requirements for power generation and driving.

[0047] The second transmission structure 35 may include a third gear 351, a fourth gear 352, a fifth gear 353, and a sixth gear 354. The third gear 351 is connected to the outer rotor 315. The fourth gear 352 meshes with the third gear 351. The fifth gear 353 meshes with the fourth gear 352, and the sixth gear 354 meshes with the fifth gear 353. The differential 36 is connected to the sixth gear 354. It is understood that this application does not limit the specific structure of the second transmission structure 35. In some possible embodiments, the second transmission structure 35 may be omitted.

[0048] Please see Figure 4 In some embodiments of this application, an air gap 3133 is formed between the outer wall of the inner stator core 3131 and the inner wall of the outer stator core 3132. The air gap 3133 is used for magnetic isolation. The inner stator core 3131 and the outer stator core 3132 achieve magnetic isolation through the air gap 3133, rather than using a dedicated magnetic isolation component. This helps reduce interference between the inner stator core 3131 and the outer stator core 3132, while also simplifying the structure of the motor 31 and reducing its weight. The width of the air gap 3133 can range from 0.5mm to 3mm, meaning it can be greater than or equal to 0.5mm and less than or equal to 3mm, achieving a good magnetic isolation effect. For example, the width of the air gap 3133 can be 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, etc., and this application does not limit the width of the air gap 3133.

[0049] Multiple supports 3134 are provided between the outer wall of the inner stator core 3131 and the inner wall of the outer stator core 3132. Each support 3134 is fixedly connected between the outer wall of the inner stator core 3131 and the inner wall of the outer stator core 3132, and the multiple supports 3134 are distributed at intervals along the circumference of the motor 31. The first core and the second core are fixedly connected together by multiple supports 3134 to form an integral structure, which helps to simplify the structure of the motor 31. The inner stator core 3131, the supports 3134, and the outer stator core 3132 are integrally formed. The inner stator core 3131, the outer stator core 3132, and the supports 3134 can be formed as a whole by stamping, which helps to improve the connection stability and reliability between the inner stator core 3131, the supports 3134, and the outer stator core 3132. It is understandable that the inner stator core 3131 and the outer stator core 3132 may not be manufactured as a single piece. For example, the inner stator core 3131 and the outer stator core 3132 may be manufactured separately and then assembled together.

[0050] Figures 2 to 3In the example shown, the inner rotor 311 of the motor 31 is connected to the engine 32, and the outer rotor 315 is connected to the wheel 10 of the vehicle 1. That is, the inner rotor 311 is used for power generation, and the outer rotor 315 is used for driving. In some embodiments of this application, the outer rotor 315 of the motor 31 may be connected to the engine 32, and the inner rotor 311 may be connected to the wheel 10 of the vehicle 1. That is, the outer rotor 315 is used for power generation, and the inner rotor 311 is used for driving, such as... Figure 5 and Figure 6 As shown. It should be noted that, Figure 5 The first transmission structure 34 shown adopts a gear structure, including a first gear 341 and a second gear 342. An outer rotor 315 is connected to the first gear 341, and the second gear 342 is meshed with the first gear 341. A clutch 33 is connected between the second gear 342 and the engine 32. The hybrid gearbox architecture of the inner and outer rotors 315 and the motor 31 uses the outer rotor 315 for power generation and the inner rotor 311 for drive. The motor 31 and the engine 32 are connected by parallel shafts. The inner and outer stators can adopt different axial lengths (also called stacked lengths) to meet different torque and power requirements for power generation and drive. Figure 6 The first transmission structure 34 shown is a planetary gear structure, driven by an outer rotor 315 and powered by an inner rotor 311, and connected to the engine 32 via a planetary gear set. The inner and outer stators can have different stack lengths to meet different torque and power requirements for power generation and driving.

[0051] In one embodiment, the motor includes an inner rotor, a stator assembly, and an outer rotor. The stator assembly includes an inner stator core and an outer stator core fixed to each other. The inner stator core is fitted onto the inner rotor, and the outer stator core is fitted onto the inner stator core. The axial length of the inner stator core is different from the axial length of the outer stator core. The outer rotor is fitted onto the outer stator core. One of the inner and outer rotors is used for drive connection with the vehicle's engine, and the other is used for drive connection with the vehicle's wheels.

[0052] Please see Figure 7 The vehicle 1 may also include a controller 60 and a battery pack 50, with the motor 31 electrically connected to the controller 60. The controller 60 is also electrically connected to the battery pack 50. The controller 60 can be used to control the motor 31, the engine 32, the battery pack 50, etc. The controller 60 can be a device with control and / or computing capabilities, capable of controlling components in the vehicle 1. One of the inner rotor 311 and the outer rotor 315 is a first rotor, and one of the inner rotor 311 and the outer rotor 315 is a second rotor. The first rotor is connected to the engine 32, and the second rotor is used to connect to the wheels 10 of the vehicle 1. The controller 60 is used to control the power system 30 to enter the charging mode, whereby the engine 32 drives the first rotor to rotate; and / or, the controller 60 controls the power system 30 to enter the motor drive mode, controlling the second rotor to rotate.

[0053] In charging mode, the power system 30 drives the first rotor to rotate, meaning the power output of the engine 32 is supplied to the first rotor. The motor 31 generates electricity and charges the battery pack 50, converting fuel into electrical energy. In motor-driven mode, the power system 30 controls the rotation of the second rotor, and the power output of the motor 31 is supplied to the wheels 10, causing the wheels 10 to rotate and converting electrical energy into kinetic energy. The operating mode also includes a mode where charging and motor-driven modes operate simultaneously. In this mode, the engine 32 drives both the first and second rotors to rotate, meaning charging and power generation occur synchronously, with the internal and external motors operating simultaneously and independently.

[0054] In some cases, the controller 60 may include a hardware module with computing capabilities and / or a software module with computing capabilities. Examples of hardware and software implementations are given below.

[0055] As an example of hardware implementation, controller 60 may include at least one processor, which is a module with processing capabilities. In one implementation, the processor includes circuitry capable of instruction reading and execution, such as an arithmetic logic unit (ALU), processor core, central processing unit (CPU), microprocessor, microcontroller unit (MCU), graphics processing unit (GPU), or digital signal processor (DSP). In another implementation, the processor implements a certain function through the logical relationships of hardware circuitry, which may be fixed or reconfigurable. For example, the processor may be a hardware circuitry implemented using an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as a field-programmable gate array (FPGA). In reconfigurable hardware circuitry, the process of the processor loading a configuration document and configuring the hardware circuitry can be understood as the process of the processor loading instructions to implement the corresponding function. Furthermore, the processor can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), tensor processing unit (TPU), deep learning processing unit (DPU), etc. In some implementations, the controller 60 includes at least one processor integrated as a system-on-chip (SOC), which is commonly referred to as an SOC by those skilled in the art. The SOC may include at least one processor; when the SOC includes multiple processors, the types of processors can be different, such as including a CPU and an NPU.

[0056] For example, controller 60 may include, but is not limited to, domain controller 60 (DC), mobile data center (MDC), electronic control unit (ECU), vehicle integrated / integration unit (VIU), etc. Among them, DC may include cockpit domain controller 60 (CDC).

[0057] As an example of software implementation, controller 60 may include software functional units. As another example of a software functional unit, controller 60 includes one or more of the following: an executable computer program, computer code, or computer instructions, where "executable" means able to run on a processor or computing instance. As yet another example of a software functional unit, controller 60 includes a computing instance, including virtual machines or containers. A virtual machine is a computer system with complete hardware system functionality simulated by software, running in an isolated environment. A container is an isolated environment obtained by packaging applications and application dependencies.

[0058] One embodiment of this application also provides a control method for a power system 30. A controller 60 can serve as the executing entity for performing the control method. The power system 30 includes an engine 32 and an electric motor 31. The electric motor 31 includes an inner rotor 311, a stator assembly 313, and an outer rotor 315. The stator assembly 313 includes an inner stator core 3131 and an outer stator core 3132 fixed to each other. The inner stator core 3131 is fitted onto the inner rotor 311, and the outer stator core 3132 is fitted onto the inner stator core 3131. The axial length of the inner stator core 3131 is different from the axial length of the outer stator core 3132. The outer rotor 315 is fitted onto the outer stator core 3132. One of the inner rotor 311 and the outer rotor 315 is a first rotor, and the other is a second rotor. The first rotor is connected to the engine 32, and the second rotor is used to connect to the wheel 10 of the vehicle 1. The control method includes: controlling the power system 30 to enter a charging mode, in which the engine 32 drives the first rotor to rotate; and / or, controlling the power system 30 to enter an electric motor drive mode, in which the second rotor is controlled to rotate.

[0059] The control method provided in this application can switch the power system 30 to work in different working modes according to the application scenario, which facilitates its use.

[0060] The power system 30 provided in this application has a motor 31 and a drive motor 31 arranged coaxially, using an inner and outer dual-rotor configuration. The motor 31 and drive motor 31 share a common stator; in other words, the stators of the motor 31 and drive motor 31 can be integrated into one unit. The inner and outer stators can have different stack lengths to meet different torque and power requirements for driving and power generation. Power generation can be achieved using an outer rotor 315 and drive using an inner rotor 311, or vice versa. The drive reduction mechanism uses a parallel shaft reduction scheme, located between the drive motor 31 and the wheel 10. The engine 32 and motor 31 use a parallel shaft / planetary gear set speed-up scheme, with the gear shaft mechanism located between the engine 32 and motor 31, which is beneficial for improving power density and efficiency.

[0061] It should be understood that expressions such as “comprising” and “may include” used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as “comprising” and / or “having” are to be interpreted as indicating a particular characteristic, number, operation, constituent element, component, or combination thereof, but not to exclude the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0062] Furthermore, in this application, the expression "and / or" includes any and all combinations of the associated listed words. For example, the expression "A and / or B" may include A, may include B, or may include both A and B.

[0063] In this application, expressions including ordinal numbers such as "first" and "second" may modify the elements. However, such elements are not limited by the foregoing expressions. For example, the foregoing expressions do not limit the order and / or importance of the elements. The foregoing expressions are only used to distinguish one element from other elements. For example, "first user equipment" and "second user equipment" refer to different user equipment, although both "first user equipment" and "second user equipment" are user equipment. Similarly, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0064] When a component is referred to as "connected" or "accessed" to other components, it should be understood that this component not only connects directly to or accesses other components, but also that another component may exist between this component and other components. On the other hand, when a component is referred to as "directly connected" or "directly accessed" to other components, it should be understood that no component exists between them.

[0065] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electric machine characterized in that, The motor includes: Internal rotor; A stator assembly includes an inner stator core and an outer stator core that are fixed to each other. The inner stator core is sleeved on the inner rotor, and the outer stator core is sleeved on the inner stator core. The axial length of the inner stator core is different from the axial length of the outer stator core. An outer rotor is fitted onto the outer stator core. One of the inner rotor and the outer rotor is used to connect to the vehicle's engine, and the other of the inner rotor and the outer rotor is used to connect to the vehicle's wheels.

2. The electric machine of claim 1, wherein, An air gap is formed between the outer wall of the inner stator core and the inner wall of the outer stator core.

3. The electric machine of claim 2, wherein, Multiple supports are provided between the outer wall of the inner stator core and the inner wall of the outer stator core. Each support is fixedly connected between the outer wall of the inner stator core and the inner wall of the outer stator core, and the multiple supports are distributed at intervals along the circumference of the motor.

4. The electric machine of claim 3, wherein, The inner stator core, the support, and the outer stator core are integrally formed.

5. The electric machine of any of claims 1-4, wherein, The motor also includes a housing, which is fitted onto the outer rotor, and at least one of the inner stator core and the outer stator core is fixedly connected to the housing by fasteners.

6. A power system characterized by, The power system includes an engine and an electric motor as described in any one of claims 1-5, wherein one of the inner rotor and the outer rotor is connected to the engine.

7. The power system of claim 6, wherein, The power system further includes a first transmission structure, through which one of the inner rotor and the outer rotor is connected to the engine.

8. The power system of claim 7, wherein, The first transmission structure includes a sun gear, planet gears, and a planet carrier. One of the inner rotor and the outer rotor is connected to the sun gear. The planet gears mesh with the sun gear. The planet carrier is connected to the planet gears. The engine is connected to the planet carrier.

9. The power system of claim 7, wherein, The first transmission structure includes a first gear and a second gear, one of the inner rotor and the outer rotor is connected to the first gear, the second gear is meshed with the first gear, and the engine is connected to the second gear.

10. The power system of any of claims 6-9, wherein, The power system also includes a clutch for engaging or disengaging the transmission connection between the engine and the electric motor.

11. The power system of any of claims 6-10, wherein, The power system also includes a differential, with the inner rotor and another of the outer rotors connected to the differential, which is used to connect to the wheels.

12. A control method of a power system, characterized by, The power system includes an engine and an electric motor. The electric motor includes an inner rotor, a stator assembly, and an outer rotor. The stator assembly includes an inner stator core and an outer stator core that are fixed to each other. The inner stator core is sleeved on the inner rotor, and the outer stator core is sleeved on the inner stator core. The axial length of the inner stator core is different from the axial length of the outer stator core. The outer rotor is sleeved on the outer stator core. One of the inner rotor and the outer rotor is a first rotor, and the other of the inner rotor and the outer rotor is a second rotor. The first rotor is connected to the engine, and the second rotor is used to connect to the wheels of the vehicle. The control method includes: controlling the power system to enter a charging mode, wherein the engine drives the first rotor to rotate; and / or, controlling the power system to enter a motor drive mode, wherein the second rotor is controlled to rotate.

13. A vehicle characterized by comprising: The vehicle includes wheels and a power system according to any one of claims 6-11, wherein the inner rotor and another of the outer rotor are drive-connected to the wheels.

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