Magnetic field adjusting structure of hub motor and hub motor assembly

Abstract

The invention relates to the field of motors, and provides a hub motor magnetism adjusting structure and a hub motor assembly. The wheel hub motor magnetism adjusting structure comprises a stator iron core. The rotor iron core is nested in the stator iron core, and the rotor iron core comprises an outer side iron core and an inner side iron core nested in the outer side iron core; the driving piece and the resetting piece are connected between the outer side iron core and the inner side iron core, under the condition that the counter electromotive force of the hub motor is higher than the voltage of the direct current bus, the driving piece is suitable for driving the inner side iron core to move towards the wire outlet end, the effective contact area of the stator and the rotor is reduced, and when the hub motor is decelerated, the reset piece is reset. The reset member is suitable for driving the inner iron core to reset relative to the stator iron core. The iron core assembly is helpful for reducing iron core loss, improving energy utilization rate and realizing more ideal motor performance under different working conditions, such as improving rotating speed output capability, reducing motor temperature rise during high-speed operation and the like; the operation efficiency of the hub motor is greatly improved, and the output performance of the hub motor is remarkably enhanced.

Description

Technical Field

[0001] The invention relates to the field of motors and provides a hub motor magnetic adjustment structure and a hub motor assembly. Background Art

[0002] With the rapid development of new energy vehicles and the increasing environmental protection requirements, pure electric vehicles have become mainstream due to their environmental friendliness and high energy conversion efficiency. Among them, the wheel hub drive motor, as an advanced driving method, has significant advantages, especially in the intelligent distributed power drive system. However, the wheel hub motor faces a series of technical challenges in the application of a wide speed range. In order to ensure the passing ability of electric vehicles under various complex terrain conditions, the wheel hub motor needs to have strong climbing ability and high-speed cruising performance, so it needs to have a high peak torque and good speed expansion capability. At present, permanent magnet motors are widely used because of their small size, light weight and high power density. However, the non-adjustability of the excitation magnetic field of the permanent magnet motor limits its speed performance in a wide speed range, especially during high-speed operation, the weak magnetic control technology will cause a significant increase in iron loss and other problems, thereby affecting the service life and operating temperature of the motor, and even having an adverse effect on the insulation performance. Summary of the invention

[0003] The embodiment of the present invention provides a hub motor magnetic adjustment structure to solve the problem in the related art that the speed performance of a permanent magnet motor is limited within a wide speed adjustment range and the iron loss increases during high-speed operation.

[0004] An embodiment of the present invention also provides a hub motor assembly structure.

[0005] A first aspect of the present invention provides a hub motor magnetic adjustment mechanism, comprising: stator core; A rotor core is nested in the stator core, the rotor core comprising an outer core and an inner core nested in the outer core; A driving member and a reset member, wherein the driving member and the reset member are connected between the outer iron core and the inner iron core. When the back electromotive force of the hub motor is higher than the DC bus voltage, the driving member is suitable for pushing out the inner iron core to reduce the effective contact area between the inner iron core and the stator iron core. When the hub motor slows down, the reset member is suitable for driving the inner iron core to reset relative to the stator iron core.

[0006] According to one embodiment of the present invention, the outer iron core, the inner iron core and the stator iron core cooperate to form a closed magnetic circuit structure.

[0007] According to an embodiment of the present invention, the driving member includes a cylinder and a piston, the cylinder is connected to the outer iron core, and the piston is connected to the inner iron core.

[0008] According to an embodiment of the present invention, the driving member further comprises a safety valve, and the relative position of the piston and the cylinder is limited by the control of the safety valve.

[0009] According to an embodiment of the present invention, a limiting member is provided on the inner core, and the outer core is suitable for limiting the relative position of the outer core with respect to the inner core through the limiting member.

[0010] According to an embodiment of the present invention, the inner iron core and the outer iron core are made of high magnetic permeability material.

[0011] A second aspect of the present invention provides a hub motor assembly, including a base and the hub motor magnetic adjustment structure, wherein the hub motor magnetic adjustment structure is installed on the base.

[0012] According to one embodiment of the present invention, a bearing is further included, and the bearing is arranged between the base and the rotor core.

[0013] According to one embodiment of the present invention, it further comprises a stator winding, wherein the stator winding is wound in the slots of the stator core.

[0014] According to an embodiment of the present invention, the stator core has a yoke-free structure to reduce the iron loss of the stator core.

[0015] According to the in-wheel motor magnetic adjustment structure provided by the embodiment of the first aspect of the present invention, when the back electromotive force of the in-wheel motor is higher than the DC bus voltage, the inner iron core is pushed out by the driving member, the effective contact area of ​​the stator and rotor of the in-wheel motor is reduced, so that the back electromotive force of the motor is reduced, and the motor is prevented from entering a weak magnetic state, and can operate more efficiently, which helps to reduce iron loss and improve energy utilization. The design of the reset member ensures that the motor can be quickly and smoothly reset when the speed is reduced or the original state needs to be restored, which helps to improve the low-speed torque output capacity and improve the overall stability and reliability of the motor. By adjusting the relative position of the inner and outer iron cores, the present invention provides a flexible way to adjust the magnetic circuit structure of the motor, which helps to achieve more ideal motor performance under different working conditions, such as increasing the speed output and reducing iron loss. That is, the iron core assembly can ensure that the in-wheel motor can continue to operate with the control strategy of the maximum torque current ratio, which not only greatly improves the operating efficiency of the in-wheel motor, but also significantly enhances the output performance of the in-wheel motor, and effectively reduces the difficulty of the design of the in-wheel motor. The iron core assembly simplifies the adjustment mechanism of the internal magnetic circuit of the motor as a whole. Compared with the conventional method of adjusting the performance by changing the number of motor windings or magnetic poles, the present invention provides a simpler and more effective solution.

[0016] The wheel hub motor assembly provided in the embodiment of the second aspect of the present invention can achieve higher working efficiency and torque output. At the same time, components such as high magnetic permeability materials and limiters in the core assembly can also improve the stability and reliability of the motor. The integration level of the wheel hub motor is significantly improved, making the entire drive system more compact and lightweight, and providing a new development direction for the power transmission and braking systems of electric vehicles and similar application fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic cross-sectional view of the hub motor assembly provided by the present invention.

[0019] Figure 2 It is a schematic cross-sectional view of the hub motor rotor core provided by the present invention.

[0020] Reference numerals: 100, stator core; 102, rotor core; 104, outer core; 106, inner core; 108, driving member; 110, reset member; 112, base; 114, rolling element; 116, stator winding; 118, permanent magnet. DETAILED DESCRIPTION

[0021] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] like Figure 1 to Figure 2 As shown, the first aspect of the present invention provides a hub motor magnetic adjustment structure, including: Stator core 100; The rotor core 102 is nested in the stator core 100 , and the rotor core 102 includes an outer core 104 and an inner core 106 nested in the outer core 104 ; The driving member 108 and the resetting member 110 are connected between the outer iron core 104 and the inner iron core 106. When the back electromotive force of the hub motor is higher than the DC bus voltage, the driving member 108 is suitable for pushing out the inner iron core 106 to reduce the effective contact area between the inner iron core 106 and the stator iron core 100. When the hub motor slows down, the resetting member 110 is suitable for driving the inner iron core 106 to reset relative to the stator iron core 100.

[0023] According to the in-wheel motor magnetic adjustment structure provided by the embodiment of the first aspect of the present invention, when the back electromotive force of the in-wheel motor is higher than the DC bus voltage, the inner iron core 106 is pushed out by the driving member 108, and the effective contact area between the inner iron core and the stator iron core in the in-wheel motor is reduced, so that the motor back electromotive force is reduced, and the motor is prevented from entering a weak magnetic state, so that the motor can operate more efficiently, which helps to reduce iron consumption and improve energy utilization. The design of the reset member 110 ensures that the motor can be quickly and smoothly reset when the speed is reduced or the original state needs to be restored, improves the low-speed torque output capacity, and helps to improve the overall stability and reliability of the motor. By adjusting the relative position of the inner and outer iron cores 104, the present invention provides a flexible way to adjust the magnetic circuit structure of the motor, which helps to achieve more ideal motor performance under different working conditions, such as increasing the speed output, reducing iron loss, etc. That is, the iron core assembly can ensure that the in-wheel motor can continue to operate with the control strategy of the maximum torque current ratio, which not only greatly improves the operating efficiency of the in-wheel motor, but also significantly enhances the output performance of the in-wheel motor, and effectively reduces the difficulty of designing the in-wheel motor. The core assembly simplifies the adjustment mechanism of the internal magnetic circuit of the motor as a whole. Compared with the traditional method of adjusting the performance by changing the number of motor windings or magnetic poles, the present invention provides a simpler and more effective solution.

[0024] Please continue to see Figure 1 and Figure 2 The hub motor magnetic adjustment mechanism provided in the embodiment of the first aspect of the present invention is particularly suitable for use in a hub motor system and is intended to optimize the performance of the motor under specific working conditions. In particular, when the back electromotive force of the hub motor is higher than the DC bus voltage, the magnetic circuit structure inside the motor can be effectively adjusted to improve the operating efficiency and stability of the motor.

[0025] The core assembly is mainly composed of the following parts: The stator core 100 serves as the basic fixed part of the motor and provides the magnetic field structure required for the operation of the motor.

[0026] The rotor core 102 is nested inside the stator core 100 and is the core component of the rotating part of the motor. The rotor core 102 is uniquely designed and consists of an outer core 104 and an inner core 106 nested inside the outer core 104. This double-layer design allows the magnetic circuit to be changed by adjusting the relative position of the inner and outer cores 104 during the operation of the motor, thereby adjusting the motor performance.

[0027] The driving member 108 is connected between the outer iron core 104 and the inner iron core 106, and is used to push out the inner iron core 106 under certain conditions (such as when the back electromotive force of the hub motor is higher than the DC bus voltage). This moving away action helps to reduce the effective contact area between the inner iron core 106 and the stator iron core, and reduce the impact of the back electromotive force on the operation of the motor. It effectively reduces the magnetic field strength, thereby reducing the back electromotive force of the hub motor, so that the hub motor does not need to enter the weak magnetic state when running at high speed.

[0028] The reset member 110 is also connected between the outer core 104 and the inner core 106, but its function is to drive the inner core 106 to reset relative to the stator core 100 when the motor slows down or needs to be restored to its original state. The reset member 110 ensures the stable operation of the motor under different working conditions.

[0029] The hub motor magnetic adjustment structure provided in the embodiment of the first aspect of the present invention effectively improves the operating efficiency and stability of the hub motor through an innovative double-layer rotor core 102 design and a flexible drive reset mechanism, bringing new technological breakthroughs to the application fields of hub motors such as electric vehicles.

[0030] According to one embodiment of the present invention, the outer core 104 , the inner core 106 , and the stator core 100 cooperate to form a closed magnetic circuit structure.

[0031] The stator core 100 is the core of the entire magnetic circuit structure and is usually formed by laminating multiple layers of thin silicon steel sheets to reduce eddy current loss and hysteresis loss. The stator core 100 may include multiple slots for accommodating stator windings, which generate magnetic fields when energized.

[0032] The outer core 104 and the inner core 106 are respectively located on the outer side and the inner side (or radial sides) of the stator core 100. The outer core 104, the inner core 106 and the stator core 100 are connected through a magnetic circuit to form a closed magnetic circuit structure. This structure helps to enhance the strength and uniformity of the magnetic field.

[0033] When the stator winding is energized, the generated magnetic field passes through the stator core 100 and forms a closed loop along the outer core 104 and the inner core 106. This closed magnetic circuit structure helps to reduce magnetic leakage and improve the efficiency and performance of the motor.

[0034] By forming a closed magnetic circuit structure, the magnetic field can be effectively transmitted and enhanced between the stator core 100, the outer core 104 and the inner core 106. This helps to increase the magnetic flux of the motor, thereby improving the output power and torque of the motor. The closed magnetic circuit structure can significantly reduce the leakage of the magnetic field, making the magnetic field more concentrated and effective. This helps to reduce the iron loss and copper loss of the motor and improve the overall efficiency of the motor. By optimizing the magnetic circuit structure, the dynamic response speed and stability of the motor can be improved. In addition, the closed magnetic circuit structure also helps to reduce the vibration and noise of the motor and improve the running quality of the motor. Through precise magnetic circuit design and material selection, the performance of magnetic materials such as silicon steel sheets can be fully utilized.

[0035] According to one embodiment of the present invention, the driving member 108 includes a cylinder and a piston, wherein the cylinder is connected to the outer iron core 104 , and the piston is connected to the inner iron core 106 .

[0036] In one embodiment of the present invention, the driving member 108 is innovatively designed as a combination structure including a cylinder and a piston. This design aims to achieve precise control of the relative position between the inner iron core 106 and the outer iron core 104 by hydraulic transmission.

[0037] In this embodiment, the cylinder is fixedly connected to the outer core 104, and the piston is connected to the inner core 106. When hydraulic oil is injected or discharged from the cylinder, the piston moves under the action of the hydraulic pressure, thereby driving the inner core 106 connected thereto to move relative to the outer core 104.

[0038] The design of the cylinder and piston not only provides sufficient driving force to overcome the friction and inertia between the iron cores, but also allows the moving speed and distance of the iron cores to be precisely adjusted by controlling the flow and pressure of the hydraulic oil. This precise control capability is crucial to achieving the function described in the present invention of adjusting the position of the iron core under specific working conditions to optimize the motor performance.

[0039] Through hydraulic transmission, precise control of the core position can be achieved. This helps to ensure that the inner core 106 can move relative to the outer core 104 in a predetermined manner and timing during the operation of the motor, thereby optimizing the performance of the motor. The combined structure of the cylinder and the piston provides sufficient driving force to overcome the friction and inertia between the cores. This allows stable driving performance to be maintained even when the load is large or the core needs to be moved quickly. Hydraulic transmission systems generally have high reliability and durability. Therefore, the design using the cylinder and piston as the driving member 108 helps to ensure the stability and reliability of the motor during long-term operation. The maintenance of the hydraulic transmission system is relatively simple, and the hydraulic oil can be replaced regularly to keep the system clean and performant. This helps to extend the service life of the motor and reduce maintenance costs. The design of the cylinder and the piston can be adjusted and optimized according to specific application requirements. For example, parameters such as the capacity of the cylinder, the diameter and stroke of the piston can be changed to adapt to different motor performance and operation requirements.

[0040] According to an embodiment of the present invention, the driving member 108 further includes a safety valve, and the relative position of the piston and the cylinder is limited by the control of the safety valve.

[0041] In one embodiment of the present invention, the safety valve is designed to ensure the safety and stability of the core assembly during operation by controlling the relative position between the piston and the cylinder.

[0042] In this embodiment, the safety valve is installed at an appropriate position of the cylinder or piston and is connected to the piston's moving mechanism. When the piston moves under the action of hydraulic oil, the safety valve monitors the pressure changes in the cylinder and the moving position of the piston. If the movement of the piston exceeds the preset safety range, or the pressure in the cylinder exceeds the set value of the safety valve, the safety valve will respond immediately and take measures to limit the further movement of the piston.

[0043] Specifically, the safety valve can limit the movement of the piston by cutting off the supply of hydraulic oil, releasing excess hydraulic oil, or adjusting the flow direction of hydraulic oil. These measures are intended to prevent the core assembly from being damaged due to excessive movement or excessive pressure during operation, thereby ensuring the safety and stability of the motor.

[0044] The introduction of the safety valve provides an extra layer of safety for the core assembly. It can respond quickly when the piston moves beyond the safe range or the pressure in the cylinder is too high, preventing the motor from being damaged or malfunctioning, thereby ensuring the safe operation of the motor. By limiting excessive movement of the piston, the safety valve helps to maintain the stability of the core assembly during operation. This helps to improve the overall performance and reliability of the motor. The safety valve usually has a simple structure and easy-to-operate characteristics. This makes it easy to check, test and replace the safety valve during motor maintenance to ensure that it is always in good working condition. The design of the safety valve can be adjusted and optimized according to specific application requirements. For example, the setting value of the safety valve can be adjusted to adapt to different working pressure and movement range requirements, thereby ensuring the safety and stability of the core assembly under different working conditions. By limiting excessive movement of the piston and preventing excessive pressure in the cylinder, the safety valve helps to reduce wear and damage to the core assembly and the motor. This helps to extend the service life of the motor and reduce maintenance costs.

[0045] According to an embodiment of the present invention, a limiting member is provided on the inner core 106 , and the outer core 104 is adapted to limit the relative position with the inner core 106 through the limiting member.

[0046] In one embodiment of the present invention, a limit member is cleverly provided on the inner core 106. The main purpose of this design is to accurately control the relative position between the outer core 104 and the inner core 106 through the limit member, thereby ensuring the stability and reliability of the core assembly during the operation of the motor.

[0047] In this embodiment, the stopper is fixedly mounted at a certain position of the inner core 106, and its shape and size are precisely designed to match the corresponding part of the outer core 104. When the outer core 104 moves relative to the inner core 106, the stopper will play a blocking or guiding role, thereby limiting the movement range of the outer core 104. This limitation not only helps to prevent the core assembly from being damaged due to excessive movement during operation, but also ensures the performance of the motor under different working conditions.

[0048] The design of the stopper can be adjusted and optimized according to the specific application requirements. For example, the shape, size and position of the stopper can be changed to adapt to different motor structures and performance requirements. In addition, the stopper can be made of different materials to meet specific strength and wear resistance requirements.

[0049] By limiting the relative position between the outer core 104 and the inner core 106, the limiter helps maintain the stability of the core assembly during operation. This helps reduce the vibration and noise of the motor and improves the overall performance and reliability of the motor. The introduction of the limiter provides an extra layer of safety for the core assembly. It can prevent damage or failure caused by excessive movement during the operation of the core assembly, thereby ensuring the safe operation of the motor. By precisely controlling the relative position between the outer core 104 and the inner core 106, the limiter helps optimize the performance of the motor. This includes improving the torque output of the motor, reducing energy consumption and reducing temperature rise. The design of the limiter is usually relatively simple and easy to operate. This makes it easy to check, test and replace the limiter during motor maintenance to ensure that it is always in good working condition. The design of the limiter can be adjusted and optimized according to specific application requirements. This enables the core assembly to adapt to different motor structures and performance requirements, thereby meeting a wider range of application scenarios.

[0050] According to one embodiment of the present invention, the inner core 106 and the outer core 104 are made of high magnetic permeability material.

[0051] In one embodiment of the present invention, the inner core 106 and the outer core 104 are both made of high magnetic permeability materials. This design aims to improve the working efficiency and performance of the core assembly in the motor by utilizing the excellent properties of high magnetic permeability materials.

[0052] High magnetic permeability materials refer to those materials that have high magnetic permeability under the action of magnetic field. They usually have high relative magnetic permeability coefficient and good response ability to magnetic field. In addition, high magnetic permeability materials also have the characteristics of low hysteresis loss and high heat resistance. They can maintain stable magnetic permeability under changing magnetic field and maintain stable performance under high temperature environment.

[0053] In the embodiment of the present invention, the inner iron core 106 and the outer iron core 104 are made of high magnetic permeability materials, which can efficiently guide the magnetic flux and reduce the loss of magnetic flux. At the same time, the high magnetic permeability material can also concentrate the magnetic flux, reduce the leakage of magnetic flux, and improve the efficiency of the electromagnet. These characteristics enable the motor to work more efficiently and stably during operation, thereby improving the overall performance.

[0054] High magnetic permeability materials can efficiently guide magnetic flux and reduce magnetic flux loss, thereby improving the working efficiency of the motor. This enables the motor to output greater torque at the same input power, or consume less electrical energy at the same torque. High magnetic permeability materials have stable magnetic permeability and can maintain stable performance under changing magnetic fields. This makes the motor more stable during operation, reduces vibration and noise, and improves overall reliability. The inner iron core 106 and the outer iron core 104 made of high magnetic permeability materials can optimize the magnetic circuit design and reduce the complexity and cost of the magnetic circuit. At the same time, the excellent performance of high magnetic permeability materials can also enable the motor to achieve higher performance with a smaller volume and weight. High magnetic permeability materials have high heat resistance and can maintain stable performance in high temperature environments. This enables the motor to work normally even in high temperature environments, broadening the application range of the motor.

[0055] See also Figure 1 and Figure 2 A second aspect of the present invention provides a hub motor, including a base 112 and the above-mentioned iron core assembly, wherein the iron core assembly is installed on the base 112.

[0056] According to the in-wheel motor provided by the embodiment of the second aspect of the present invention, by adopting the core assembly design described above, the in-wheel motor can achieve higher working efficiency and torque output. At the same time, components such as high magnetic permeability materials and limiters in the core assembly can also improve the stability and reliability of the motor.

[0057] The design of the base 112 takes into account the need for heat dissipation, and through reasonable structural layout and material selection, efficient heat conduction is achieved. This helps to reduce the temperature of the motor during operation and extend the service life of the motor. The design of the base 112 and the core assembly takes into account the need for weight reduction, and the lightweight of the hub motor is achieved by adopting lightweight materials and optimizing the structural design. This helps to reduce the curb weight of electric vehicles and improve the energy efficiency and endurance of the vehicle. The use of precise manufacturing processes and assembly technologies can ensure the precise alignment and fixation between the core assembly and the base 112. This helps to reduce the vibration and noise of the motor during operation and improve overall reliability. The hub motor design in this embodiment has the characteristics of high efficiency, stability, and lightweight, and is suitable for various application scenarios such as electric vehicles and hybrid vehicles. At the same time, by adjusting the design parameters of the core assembly and the base 112, different vehicle models and performance requirements can also be met.

[0058] Please continue to see Figure 2 The second embodiment of the present invention proposes an innovative hub motor assembly design, which mainly includes a base 112 and the hub motor magnetic adjustment mechanism described above. In this design, the core assembly is carefully installed on the base 112 to form a compact and efficient motor structure.

[0059] As the supporting structure of the hub motor, the base 112 has sufficient strength and rigidity to ensure that the motor can remain stable during operation. At the same time, the design of the base 112 also takes into account the needs of heat dissipation and weight reduction. Through reasonable structural design and material selection, efficient heat conduction and light weight are achieved.

[0060] The core assembly is the core component of the hub motor, and its design has been described in detail in the first embodiment of the present invention. The core assembly includes an inner core 106, an outer core 104, and components such as a drive member 108 and a stop member therebetween. These components work together to achieve precise control and optimization of the magnetic field inside the motor.

[0061] When the core assembly is mounted on the base 112, it is necessary to ensure accurate alignment and fixation between the components. This can be achieved by using precise manufacturing processes and assembly techniques to ensure that the motor can maintain an efficient and stable working state during operation.

[0062] According to an embodiment of the present invention, a bearing 114 is further included. The bearing 114 is disposed between the base 112 and the core assembly.

[0063] In one embodiment of the present invention, a key component, bearing 114, is introduced into the wheel hub motor. Bearing 114 is cleverly arranged between the base 112 and the core assembly, and is intended to take into account the functions of both the motor bearing and the wheel hub bearing.

[0064] The bearing 114 can be made of a variety of shapes and materials, such as ball bearings, roller bearings, etc., and the selection depends on the specific application requirements and working environment. In this embodiment, the bearing 114 is designed to fit tightly between the base 112 and the core assembly to ensure that good contact and rolling conditions can be maintained during the operation of the motor.

[0065] In addition, the bearing 114 can also play a role in shock absorption and buffering. During the operation of the motor, due to the influence of various factors (such as load changes, temperature changes, etc.), the magnetic adjustment mechanism of the hub motor may produce slight vibrations or shocks. The existence of the bearing 114 can absorb these vibrations and shocks, protect the motor from damage, and improve the stability and reliability of the motor.

[0066] According to an embodiment of the present invention, a stator winding 116 is further included. The stator winding 116 is wound in the slots of the stator core 110 .

[0067] In one embodiment of the present invention, the stator winding 116 is a coil wound by an insulated wire, and can be wound in a single layer or double layer according to the design requirements of the motor. The stator winding 116 is wound in the slots of the stator core 110 and is connected to an external power source through a specific connection method (such as a star connection or a triangle connection). When the stator winding 116 is energized, a rotating magnetic field is generated in the stator core 110. This rotating magnetic field will produce relative motion with the conductor in the rotor (not directly mentioned in this embodiment, but usually an important component of the motor), thereby generating an induced current in the conductor, and then generating an electromagnetic force to drive the rotor to rotate.

[0068] The winding process and insulation treatment of the stator winding 116 are crucial to the long-term stable operation of the motor. Good winding process and insulation treatment can reduce the occurrence of winding failures and improve the reliability and service life of the motor.

[0069] According to an embodiment of the present invention, the stator core 110 has no yoke structure to reduce the iron loss of the stator core 110 .

[0070] In one embodiment of the present invention, a conventional stator core generally includes a yoke and a tooth, wherein the yoke connects the teeth to form a closed magnetic circuit. However, in this embodiment of the present invention, the stator core 110 adopts a yokeless structure, i.e., the conventional yoke design is removed. This yokeless structure design makes the magnetic circuit of the stator core 110 more concise, and reduces unnecessary magnetic resistance and iron loss.

[0071] In order to further reduce iron loss, the material selection of the stator core 110 is also very important. In this embodiment, high-performance silicon steel sheets or other low-loss magnetic materials may be used. These materials have excellent magnetic conductivity and low loss characteristics, which help to reduce eddy current loss and hysteresis loss.

[0072] The stator core 110 with a yokeless structure may require some special processing in the manufacturing process, such as precise cutting, lamination and connection, etc. These process steps need to ensure the structural stability and electromagnetic performance of the stator core 110 .

[0073] Since the traditional yoke design is removed, the stator core 110 with a yokeless structure reduces unnecessary magnetic resistance and iron loss. This allows the motor to generate less heat and loss during operation, thereby improving the efficiency and reliability of the motor. The stator core 110 with a yokeless structure makes the magnetic circuit of the motor more concise and efficient. This helps to reduce the electromagnetic noise and vibration of the motor and improve the running stability and service life of the motor. The stator core 110 with a yokeless structure provides more flexibility and possibilities for the design of the motor. Designers can optimize and adjust the structure, size and materials of the motor according to specific application scenarios and requirements. Although the stator core 110 with a yokeless structure may require some special processing in the manufacturing process, it can generally reduce the manufacturing cost of the motor. This is because the yokeless structure reduces material waste and processing complexity, thereby reducing production costs and manufacturing cycles.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hub motor magnetic adjustment structure, characterized in that: include: Stator core (100); A rotor core (102) is nested in the stator core (100), wherein the rotor core (102) comprises an outer core (104) and an inner core (106) nested in the outer core (104); A driving member (108) and a reset member (110), wherein the driving member (108) and the reset member (110) are connected between the outer iron core (104) and the inner iron core (106); when the back electromotive force of the wheel hub motor is higher than the DC bus voltage, the driving member (108) is suitable for pushing out the inner iron core (106) to reduce the effective contact area between the inner iron core (106) and the stator iron core (100); when the wheel hub motor is decelerated, the reset member (110) is suitable for driving the inner iron core (106) to reset relative to the stator iron core (100).

2. The in-wheel motor magnetic adjustment structure according to claim 1, characterized in that: The outer iron core (104), the inner iron core (106) and the stator iron core (100) cooperate to form a closed magnetic circuit structure.

3. The wheel hub motor adjustment structure according to claim 1, characterized in that: The driving member (108) comprises an oil cylinder and a piston, the oil cylinder is connected to the outer iron core (104), and the piston is connected to the inner iron core (106).

4. The hub motor magnetic adjustment structure according to claim 3, characterized in that: The driving member (108) further comprises a safety valve, and the relative position of the piston and the cylinder is limited by the control of the safety valve.

5. The hub motor magnetic adjustment structure according to claim 3, characterized in that: A limiting member is provided on the inner iron core (106), and the outer iron core (104) is suitable for limiting the relative position with the inner iron core (106) through the limiting member.

6. The in-wheel motor magnetic adjustment structure according to any one of claims 1 to 5, characterized in that: The inner iron core (106) and the outer iron core (104) are made of high magnetic permeability material.

7. A hub motor assembly, characterized in that: It comprises a machine base (112) and a hub motor magnetic adjustment structure according to any one of claims 1 to 6, wherein the hub motor magnetic adjustment structure is mounted on the machine base (112).

8. The wheel hub motor assembly according to claim 7, characterized in that: It also includes a bearing (114), wherein the bearing (114) is arranged between the machine base (112) and the rotor core (102).

9. The wheel hub motor assembly according to claim 7, characterized in that: It also includes a stator winding (116), wherein the stator winding (116) is wound in the slots of the stator core (110).

10. The wheel hub motor assembly according to claim 9, characterized in that: The stator core (110) has no yoke structure so as to reduce the iron loss of the stator core (110).

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