Integrated winding type double-stator variable flux permanent magnet motor

Abstract

The invention relates to an integrated winding type double-stator variable flux permanent magnet motor which comprises an outer stator, a middle rotor and an inner stator, the outer stator is located at the outer ring position of a motor body, the middle rotor is embedded in the inner ring position of the outer stator, and the inner stator is embedded in the inner ring position of the middle rotor. Stator teeth where high-coercivity permanent magnets of a motor outer stator are located and iron core pole stator teeth are alternately arranged, stator teeth where low-coercivity permanent magnets of a motor inner stator are located and iron core pole stator teeth are alternately arranged, the magnetic field adjusting range of the motor can be adjusted by adjusting the size ratio of the inner stator to the outer stator, and a hybrid permanent magnet structure is adopted. The outer stator adopts a high-coercivity permanent magnet, the inner stator adopts a low-coercivity permanent magnet, the rotor is provided with an air gap magnetic barrier, the influence of the high-coercivity permanent magnet on the low-coercivity permanent magnet can be effectively isolated, the magnetic stability of the low-coercivity permanent magnet is improved, and the inner stator adopts an integrated winding. The application has the effect of improving the power density and the torque density of the motor.

Description

Technical Field

[0001] This application relates to the field of memory motors, and in particular to an integrated winding type double-stator variable flux permanent magnet motor. Background Technique

[0002] Permanent magnet synchronous motors generally use neodymium iron boron permanent magnets with high coercivity as the permanent magnet magnetic source. It has the advantages of high power density, high efficiency, reliable operation, etc. It has largely replaced electrically excited motors in the field of medium and small power, and has thus been widely used in various fields of aerospace, industrial and agricultural production, and daily life. However, due to the use of neodymium iron boron permanent magnets, it is very difficult to demagnetize them, so the air-gap magnetic field in the motor remains basically constant. When operating as an electric motor, the speed regulation range is very limited. Therefore, the adjustable flux permanent magnet motor aiming at effectively regulating the air-gap magnetic field of the permanent magnet motor has always been a hot spot and a difficult point in the field of motor research.

[0003] The memory motor uses low coercivity permanent magnets to generate a circumferential magnetic field through the stator winding or the DC pulse winding, thereby changing the magnetization intensity of the permanent magnet and adjusting the air-gap magnetic field. At the same time, the permanent magnet has the characteristic that the magnetic flux density level can be memorized. Its wide speed regulation range and its all-region high efficiency characteristics are of great significance for improving the energy efficiency of new energy vehicles. The traditional stator permanent magnet type memory motor needs to be equipped with a DC magnetic field regulation winding, and the DC magnetic field regulation winding will occupy a certain slot space, which has a great impact on the power density and torque density of the motor. Therefore, in view of the above related technologies, the inventor believes that there is a defect that the power density of the motor has not been effectively improved. Summary of the Invention

[0004] In order to improve the defect that the power density of the motor has not been effectively improved, this application provides an integrated winding type double-stator variable flux permanent magnet motor.

[0005] An integrated winding type double-stator variable flux permanent magnet motor provided by this application adopts the following technical solutions:

[0006] An integrated winding type double-stator variable flux permanent magnet motor includes a motor body, and the motor body includes an outer stator, an intermediate rotor, and an inner stator;

[0007] The outer stator is located at the outer ring position of the motor body. The intermediate rotor is embedded in the inner ring of the outer stator, and the inner stator is embedded in the inner ring position of the intermediate rotor.

[0008] By adopting the above technical solutions, the outer stator, the intermediate rotor, and the inner stator are mutually embedded and installed, forming a multi-level magnetic field coupling, enabling the motor to achieve efficient magnetic flux regulation during operation, enhancing the torque output and power density of the motor, optimizing the magnetic field distribution, reducing the hysteresis loss, and simultaneously improving the working efficiency and thermal management performance. Without increasing the volume, the dynamic response ability, stability, and durability of the motor are enhanced.

[0009] Optionally, the outer stator includes a high coercivity permanent magnet, an outer stator armature winding, outer stator teeth, and an outer stator yoke. The outer stator yoke is located on the outermost layer of the motor, the outer stator teeth are located inside the outer stator yoke, and the outer stator armature winding is located in the space of the outer stator teeth.

[0010] The stator teeth where the high coercivity permanent magnets of the outer stator and the stator teeth of the iron core poles are arranged alternately, and the width of the stator teeth where the high coercivity permanent magnets are located is greater than the width of the stator teeth of the iron core poles.

[0011] By adopting the above technical solutions, a combined design of a high coercivity permanent magnet, an outer stator armature winding, outer stator teeth, and an outer stator yoke is adopted in the outer stator, optimizing the magnetic field distribution and electromagnetic coupling effect, enabling the motor to maintain high efficiency and stability under high load and high-speed operation conditions. The high coercivity permanent magnets and the stator teeth of the iron core poles are arranged alternately, and the stator teeth where the high coercivity permanent magnets are located have a larger width, which helps to increase the magnetic flux density, reduce the eddy current loss, enhance the output power and torque of the motor. The outer stator armature winding further enhances the electromagnetic conversion efficiency, improves the anti-interference ability and load adaptability of the motor in complex working environments, and simultaneously optimizes the thermal management performance of the motor, reducing the hysteresis loss and mechanical wear.

[0012] Optionally, the intermediate rotor includes outer ring rotor teeth, a rotor air magnetic barrier, a rotor magnetic bridge, and inner ring rotor teeth. The rotor air magnetic barrier is located between the outer ring rotor teeth and the inner ring rotor teeth.

[0013] By adopting the above technical solutions, outer ring rotor teeth, a rotor air magnetic barrier, a rotor magnetic bridge, and inner ring rotor teeth are arranged in the intermediate rotor, optimizing the magnetic flux path inside the rotor, enhancing the uniformity and stability of the magnetic field, reducing the magnetic flux leakage and eddy current loss, improving the efficiency and power density of the motor, and simultaneously reducing the attenuation of the rotor magnetic field through the design of the air magnetic barrier, enhancing the stability and response speed of the motor under high load and high speed.

[0014] Optionally, the inner stator includes inner stator teeth, an inner stator integrated winding, a low coercivity permanent magnet, and an inner stator yoke. The inner stator yoke is located on the innermost layer of the motor, the inner stator teeth are located outside the inner stator yoke, and the inner stator integrated winding is located in the space of the inner stator teeth.

[0015] By adopting the above technical solutions, the inner stator combines inner stator teeth, an inner stator integrated winding, a low coercivity permanent magnet, and an inner stator yoke, improving the power output and efficiency of the motor. The synergistic effect of the low coercivity permanent magnet and the integrated winding optimizes the electromagnetic energy conversion, reduces hysteresis loss and eddy current loss, and at the same time enhances the stability and responsiveness of the motor, making it suitable for high-performance, high-power density, and long-term stable operation of motor systems.

[0016] Optionally, the stator teeth where the low coercivity permanent magnets of the inner stator are located and the stator teeth of the iron core poles are arranged alternately, and the width of the stator teeth where the low coercivity permanent magnets are located is greater than the width of the stator teeth of the iron core poles.

[0017] By adopting the above technical solutions, the stator teeth where the low coercivity permanent magnets of the inner stator are arranged alternately with the stator teeth of the iron core poles, and the width of the stator teeth where the low coercivity permanent magnets are located is greater than the width of the stator teeth of the iron core poles, optimizing the magnetic field distribution, increasing the magnetic flux density, effectively improving the torque output and efficiency of the motor, reducing hysteresis loss, and enhancing the stability and response speed of the motor under high load and high-speed conditions, and improving its power density and overall performance.

[0018] Optionally, the outer stator armature winding is connected into a three-phase winding, and the inner stator integrated winding adopts an open winding structure;

[0019] The outer stator armature winding and the inner stator integrated winding are independent of each other and are not connected in series or in parallel.

[0020] By adopting the above technical solutions, the electromagnetic isolation and power transmission of the motor are optimized, the mutual interference between windings is reduced, the working stability and efficiency of the motor are improved, the load adaptability is enhanced, and the overall performance under high power density and complex working environments is improved.

[0021] Optionally, the outer stator uses high coercivity permanent magnets, the inner stator uses low coercivity permanent magnets, and the outer stator and the inner stator are of a hybrid permanent magnet structure. When a bias direct current is applied to the inner stator integrated winding, the magnetization level of the low coercivity permanent magnet can be adjusted.

[0022] By adopting the above technical solutions, high coercivity permanent magnets and low coercivity permanent magnets are respectively used in the outer stator and the inner stator, and using the hybrid permanent magnet structure, when a bias direct current is applied to the inner stator integrated winding, the magnetization level of the low coercivity permanent magnet can be flexibly adjusted, thereby realizing the dynamic regulation of the motor magnetic field, improving the torque control ability, efficiency, and response speed of the motor, and at the same time optimizing the performance and stability of the motor under different working conditions.

[0023] Optionally, the motor body enlarges the ratio of the inner stator part to the outer stator part, making the proportion of the inner stator part higher, widening the field weakening range of the motor. The field weakening range of the motor can be adjusted by adjusting the size ratio of the inner and outer stators.

[0024] By adopting the above technical solution, the proportion of the inner stator is made higher, thereby expanding the field weakening range of the motor. The magnetic field strength and distribution of the motor can be flexibly adjusted by adjusting the size ratio of the inner and outer stators, achieving a wider magnetic field adjustment ability, improving the adaptability, adjustment accuracy and overall performance of the motor under different working conditions, and enhancing the flexibility and controllability of the motor.

[0025] Optionally, the intermediate rotor is provided with an air-gap magnetic barrier that effectively isolates the influence of the high coercivity permanent magnet on the low coercivity permanent magnet, improving the magnetic stability of the low coercivity permanent magnet.

[0026] By adopting the above technical solution, an air-gap magnetic barrier that effectively isolates the influence of the high coercivity permanent magnet on the low coercivity permanent magnet is arranged in the intermediate rotor, optimizing the magnetic field distribution, improving the magnetic stability of the low coercivity permanent magnet, reducing the interference of the high coercivity permanent magnet on the low coercivity permanent magnet, thereby improving the magnetic performance, adjustment accuracy and stability of the motor, and enhancing the reliability and adaptability of the motor under different loads and working conditions.

[0027] Optionally, the outer stator motor and the inner stator motor can be independently regarded as two motors with different pole-slot combinations.

[0028] By adopting the above technical solution, independent control of the magnetic fields of the inner and outer stators can be achieved, optimizing the magnetic force distribution and power output of the motor, improving the working efficiency and responsiveness of the motor, reducing the interference between the inner and outer stators, and enhancing the performance stability and load adaptability of the motor under different working conditions.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. The motor adopts a double-stator structure, with high coercivity permanent magnets attached to the outer stator and low coercivity permanent magnets attached to the inner stator. The high coercivity permanent magnets provide the main magnetic flux, and the low coercivity permanent magnets are used to adjust the magnetic flux. By adopting a hybrid permanent magnet form, the torque density of the motor is increased;

[0031] 2. The inner stator adopts an integrated winding, which combines the functions of an armature winding and a field weakening winding, can effectively remove the DC field weakening winding in the traditional stator permanent magnet memory motor, improve the space utilization rate of the inner stator slots, and thus improve the motor performance;

[0032] 3. When designing this motor, the field weakening range of the motor can be effectively adjusted by adjusting the radius ratio of the inner and outer stators;

[0033] 4. The outer stator motor and the inner stator motor can be independent of each other, and their respective pole-slot combinations can be unaffected; at the same time, the low coercivity permanent magnet in the inner stator can also be isolated from the high coercivity permanent magnet in the outer stator to maintain the stability of the operating point of the low coercivity permanent magnet.

[0034] 5. Through the embedded design of the outer stator, the intermediate rotor, and the inner stator, a multi-level magnetic field coupling is formed, optimizing the magnetic field distribution of the motor, enhancing the magnetic flux regulation ability, and strengthening the torque output and power density of the motor.

[0035] 6. The combination of high coercivity permanent magnets and low coercivity permanent magnets, and the design of different pole-slot combinations enable the motor to maintain high efficiency and stability under high loads and high speeds, while reducing eddy current losses, hysteresis losses, and mechanical wear.

[0036] 7. Through the independent regulation of the magnetic fields of the inner and outer stators and the setting of the air-gap magnetic barrier, the stability, magnetic properties, and regulation accuracy of the motor are enhanced, and the adaptability and reliability of the motor under different loads and working environments are strengthened.

[0037] 8. By adjusting the size ratio of the inner and outer stators, the magnetic flux regulation range of the motor is optimized, enabling the motor to achieve more precise magnetic field control and regulation under different working conditions, and enhancing its flexibility and controllability.

[0038] 9. By setting the air-gap magnetic barrier and optimizing the magnetic field path, the influence of the high coercivity permanent magnet on the low coercivity permanent magnet is reduced, the magnetic stability of the low coercivity permanent magnet is enhanced, and the stability and response speed of the motor are further improved. Description of the Drawings

[0039] Figure 1 is a cross-sectional structure diagram of an integrated winding type double-stator variable flux permanent magnet motor according to an embodiment of the present application.

[0040] Figure 2 is a schematic diagram of magnetic force lines of an integrated winding type double-stator variable flux permanent magnet motor in a full-magnetic state according to an embodiment of the present application.

[0041] Figure 3 is a schematic diagram of magnetic force lines of an integrated winding type double-stator variable flux permanent magnet motor in a zero-magnetic state according to an embodiment of the present application.

[0042] Figure 4 is a schematic diagram of back electromotive force of an integrated winding type double-stator variable flux permanent magnet motor under different magnetization states at the same rotational speed of the motor according to an embodiment of the present application.

[0043] Description of reference numerals: 1. Outer stator; 1.1 High coercivity permanent magnet; 1.2 Outer stator armature winding; 1.3 Outer stator teeth; 1.4 Outer stator yoke; 2. Intermediate rotor; 2.1 Outer ring rotor teeth; 2.2 Rotor air magnetic barrier; 2.3 Rotor magnetic bridge; 2.4 Inner ring rotor teeth; 3. Inner stator; 3.1 Inner stator teeth; 3.2 Inner stator integrated winding; 3.3 Low coercivity permanent magnet; and 3.4 Inner stator yoke; 6. Motor body. Detailed implementation manners

[0044] The following further describes the present application in conjunction with the Figures 1-4 accompanying drawings in more detail.

[0045] An embodiment of the present application discloses an integrated winding type double stator variable flux permanent magnet motor. Referring to Figure 1 , the motor body 6 includes an outer stator 1, an intermediate rotor 2 and an inner stator 3. The outer stator 1 is located at the outer ring position of the motor body 6. The intermediate rotor 2 is embedded in the inner ring of the outer stator 1. The inner stator 3 is embedded in the inner ring position of the intermediate rotor 2. The motors of the outer stator 1 and the inner stator (3) can be independently regarded as two motors with different pole-slot combinations. The integrated winding type double stator variable flux permanent magnet motor realizes the independent control and optimization of the outer stator and inner stator motors. They have different pole-slot combinations and can independently adjust their respective magnetic field distributions and power outputs, thereby improving the working efficiency, stability and response speed of the motor. Through the independence of the outer stator and the inner stator, the mutual interference is effectively reduced, the magnetic coupling effect is optimized, and the adaptability and anti-interference ability of the motor under complex loads and high-speed operations are enhanced. At the same time, the magnetic regulation accuracy and dynamic response ability of the motor are improved, the energy loss is reduced, and the overall power density and operation stability are improved.

[0046] Referring to Figure 1, the outer stator 1 includes a high coercivity permanent magnet 1.1, an outer stator armature winding 1.2, outer stator teeth 1.3, and an outer stator yoke 1.4. The outer stator yoke 1.4 is located on the outermost layer of the motor. The outer stator teeth 1.3 are located inside the outer stator yoke 1.4. The outer stator armature winding 1.2 is located in the space of the outer stator teeth 1.3; the stator teeth where the high coercivity permanent magnets 1.1 of the outer stator 1 are located and the stator teeth of the iron core pole are arranged alternately, and the width of the stator teeth where the high coercivity permanent magnets 1.1 are located is greater than the width of the stator teeth of the iron core pole. The high coercivity permanent magnets 1.1 of the outer stator 1 are arranged alternately with the outer stator teeth 1.3 and the stator teeth of the iron core pole, and the width of the stator teeth where the high coercivity permanent magnets are located is greater than the width of the stator teeth of the iron core pole, optimizing the magnetic field distribution and electromagnetic coupling effect of the motor, effectively increasing the magnetic flux density, reducing eddy current loss and hysteresis loss, thereby enhancing the torque output and power density of the motor. The reasonable arrangement of the outer stator armature winding 1.2 and the outer stator teeth 1.3 improves the electromagnetic conversion efficiency of the motor, maintaining high stability and efficiency under high load and high speed conditions. The alternating arrangement of the high coercivity permanent magnets of the outer stator and the stator teeth of the iron core pole further optimizes the magnetic field strength and direction, enhancing the anti-interference ability and load adaptability of the motor and improving the thermal management performance of the motor;

[0047] The intermediate rotor 2 includes outer ring rotor teeth 2.1, a rotor air magnetic barrier 2.2, a rotor magnetic bridge 2.3, and inner ring rotor teeth 2.4. The rotor air magnetic barrier 2.2 is located between the outer ring rotor teeth 2.1 and the inner ring rotor teeth 2.4. The design of the intermediate rotor 2 of the motor optimizes the magnetic field path. The combination of the outer ring rotor teeth 2.1, the rotor air magnetic barrier 2.2, the rotor magnetic bridge 2.3, and the inner ring rotor teeth 2.4 improves the uniformity and stability of the magnetic field, effectively reducing magnetic flux leakage and eddy current loss, and increasing the motor efficiency and power density. The setting of the rotor air magnetic barrier 2.2 between the outer ring rotor teeth and the inner ring rotor teeth effectively isolates magnetic field interference, improves the stability of the rotor magnetic field, and enhances the dynamic response ability and high load stability of the motor;

[0048] The inner stator 3 includes inner stator teeth 3.1, an inner stator integrated winding 3.2, a low coercivity permanent magnet 3.3, and an inner stator yoke 3.4. The inner stator yoke 3.4 is located in the innermost layer of the motor. The inner stator teeth 3.1 are located outside the inner stator yoke 3.4. The inner stator integrated winding 3.2 is located in the space of the inner stator teeth 3.1. The stator teeth where the low coercivity permanent magnets 3.3 of the inner stator 3 are located and the stator teeth of the iron core poles are arranged alternately, and the width of the stator teeth where the low coercivity permanent magnets 3.3 are located is greater than the width of the stator teeth of the iron core poles. The alternating arrangement of the low coercivity permanent magnets 3.3 and the stator teeth of the iron core poles in the inner stator 3, and the width of the stator teeth where the low coercivity permanent magnets 3.3 are located being greater than the width of the stator teeth of the iron core poles optimize the magnetic field distribution and power output, further improve the torque output and efficiency of the motor, reduce the hysteresis loss, enhance the stability and responsiveness, and meet the requirements of higher performance and long-term stable operation.

[0049] Refer to Figure 1 , the outer stator armature winding 1.2 is connected into a three-phase winding. The inner stator integrated winding 3.2 adopts an open winding structure and does not require a dedicated magnetic field regulating winding, which can effectively improve the slot fill factor of the inner stator of the motor. The outer stator armature winding 1.2 and the inner stator integrated winding 3.2 are independent of each other and are not connected in series or in parallel. The outer stator armature winding 1.2 adopts a three-phase winding structure, which effectively improves the electromagnetic coupling efficiency of the motor, optimizes the power output and current distribution, thereby improving the efficiency and torque output of the motor. The inner stator integrated winding 3.2 adopts an open winding structure, which can reduce the mutual interference between windings and reduce the energy loss during the electromagnetic conversion process, effectively improving the load adaptability of the motor under complex working conditions, optimizing the thermal management performance of the motor, and at the same time increasing the stability and durability of the motor.

[0050] In application, the outer stator 1 adopts high coercivity permanent magnets, and the inner stator 3 adopts low coercivity permanent magnets. The outer stator 1 and the inner stator 3 are of a hybrid permanent magnet structure, and the magnetization level of the low coercivity permanent magnets can be adjusted; effectively improving the torque density of the motor, the high coercivity permanent magnets are magnetized in the same direction to provide the main magnetic flux, and the low coercivity permanent magnets are also magnetized in the same direction to provide the regulating magnetic flux; when a bias DC current is applied to the inner stator integrated winding, the magnetization level of the low coercivity permanent magnets can be adjusted.

[0051] The motor body 6 enlarges the proportion of the inner stator 3 part relative to the outer stator 1 part, making the proportion of the inner stator 3 part higher and the magnetic field regulating range of the motor wider. The magnetic field regulating range of the motor can be adjusted by adjusting the size ratio of the inner and outer stators. The intermediate rotor 2 is provided with an air gap magnetic barrier that can effectively isolate the influence of the high coercivity permanent magnets on the low coercivity permanent magnets, which can effectively isolate the influence of the high coercivity permanent magnets on the low coercivity permanent magnets and improve the magnetic stability of the low coercivity permanent magnets.

[0052] Refer to Figure 2 , Figure 2It is a schematic diagram of magnetic field lines of an integrated winding type double-stator variable flux permanent magnet motor under the full magnetic state. The inner stator teeth 3.1 of the inner stator 3 have high-density magnetic field lines. The design of high-density magnetic field lines on the inner stator teeth 3.1 can significantly improve the torque output, power density and efficiency of the motor by enhancing the magnetic flux density and optimizing the magnetic field distribution, reduce eddy current and hysteresis losses, and enhance the stability, responsiveness and load adaptability of the motor. Especially under high-load and high-speed operating conditions, it can provide higher dynamic response ability and working efficiency.

[0053] Refer to Figure 3 , Figure 3 It is a schematic diagram of magnetic field lines of an integrated winding type double-stator variable flux permanent magnet motor under the zero magnetic state. By reasonably designing the double-stator structure and variable flux characteristics, the motor can effectively reduce the magnetic resistance and eddy current losses under the zero magnetic state, improve the efficiency, improve the starting performance, reduce the magnetic field interference to the external environment, thereby enhancing its adaptability and stability, especially performing excellently under high-speed or variable load conditions.

[0054] Refer to Figure 4 , Figure 4 It is a schematic diagram of back electromotive force of an integrated winding type double-stator variable flux permanent magnet motor under different magnetization states at the same motor speed. When the rotor assembly is at different angles relative to the inner stator and the outer stator, different magnetization states are generated. Through the adjustment of the back electromotive force under different magnetization states, higher efficiency and a wider working range can be achieved at the same speed, energy losses can be reduced, and at the same time, the output performance can be improved, enabling it to maintain excellent power output and stability under various load conditions.

[0055] The implementation principle of an integrated winding type double-stator variable flux permanent magnet motor in an embodiment of this application is as follows: The independent control of the outer stator and the inner stator adopts different pole-slot combinations and electromagnetic coupling structures. Combining the hybrid permanent magnet design of high coercivity permanent magnets and low coercivity permanent magnets, the flux regulation and power optimization of the motor are achieved. The windings of the outer stator and the inner stator do not interfere with each other, and the electromagnetic conversion efficiency of the motor is improved respectively through the three-phase winding and the open winding structure, optimizing the power output and current distribution. At the same time, through the intermediate rotor design, the magnetic field interference between the outer stator and the inner stator is effectively isolated, improving the stability of the rotor magnetic field and the dynamic response ability of the motor, reducing eddy current and hysteresis losses, increasing the efficiency and power density, and improving the thermal management performance and load adaptability. The inner stator realizes the dynamic magnetic field regulation under different working conditions through the low coercivity permanent magnets with adjustable magnetization, further enhancing the stability, efficiency and torque output of the motor under high load and high speed operation. At the same time, the independent regulation of the inner stator and the outer stator can optimize the magnetic field distribution and power output according to requirements, thus significantly improving the working efficiency, response speed and stability of the motor, especially suitable for complex loads and high speed operation environments. In addition, by adjusting the size ratio of the inner and outer stators, the flux range of the motor is adjusted, enabling it to have a wider flux regulation range, further enhancing the adaptability and anti-interference ability of the motor under variable loads and operating conditions, and overall improving the power output, response ability, thermal management performance and working stability of the motor.

[0056] The technical advantages of an integrated winding type double-stator variable flux permanent magnet motor in an embodiment of this application are as follows:

[0057] 1. Independent control and optimization: The outer stator and the inner stator realize independent regulation of the magnetic field distribution and power output through independent control systems, and can optimize the performance of the motor and improve the working efficiency according to different working conditions and load requirements.

[0058] 2. Efficient magnetic field distribution: The pole-slot combination design of the outer stator and the inner stator and the hybrid permanent magnet structure of high coercivity and low coercivity permanent magnets not only optimize the magnetic field distribution of the motor, but also effectively increase the magnetic flux density, reduce eddy current losses and hysteresis losses, thus significantly improving the power density, torque output and efficiency of the motor.

[0059] 3. Dynamic response ability and load adaptability: Through the intermediate rotor design, the dynamic response ability of the motor is enhanced, and at the same time, the magnetic field interference between the outer stator and the inner stator is effectively isolated, improving the adaptability and anti-interference ability of the motor under high speed and complex loads.

[0060] 4. Adjustable magnetization function: The inner stator uses low coercivity permanent magnets, enabling the adjustment of the magnetization level. The magnetic field is adjusted by controlling the DC current. This function can dynamically adjust the magnetic field according to the load demand and working environment, improving the stability and efficiency of the motor under different operating conditions.

[0061] 5. Thermal management and stability: The optimization of the motor structure and low-loss design help reduce the heat accumulation inside the motor, enhancing the motor's thermal management ability and ensuring the motor remains highly efficient and stable during high-load and high-speed operation.

[0062] 6. Diverse operating range and efficiency optimization: The motor can effectively reduce the reluctance and eddy current losses in the zero-magnetic state, enhancing the starting performance and reducing the interference to the external magnetic field. At the same time, through the back electromotive force adjustment in different magnetization states, higher efficiency can be achieved at the same rotational speed, expanding the motor's operating range.

[0063] 7. Dimension adjustment and magnetic flux adjustment range: By adjusting the size ratio of the inner and outer stators, the magnetic flux range of the motor can be adjusted, further enhancing the motor's adaptability to variable load conditions and working environments.

[0064] The above are all the preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. An integrated winding dual-stator variable flux permanent magnet motor, comprising a motor body (6), characterized in that: The motor body (6) comprises an outer stator (1), an intermediate rotor (2) and an inner stator (3); The outer stator (1) is located at the outer ring position of the motor body (6), the inner ring of the outer stator (1) is embedded with the intermediate rotor (2), and the inner stator (3) is embedded with the inner ring position of the intermediate rotor (2); The outer stator (1) comprises a high coercive force permanent magnet (1.1), an outer stator armature winding (1.2), an outer stator tooth (1.3) and an outer stator yoke (1.4); the outer stator yoke (1.4) is located at the outermost layer of the motor, the outer stator tooth (1.3) is located on the inner side of the outer stator yoke (1.4), and the outer stator armature winding (1.2) is located in a space formed by the outer stator teeth (1.3); The intermediate rotor (2) comprises outer ring rotor teeth (2.1), a rotor air magnetic barrier (2.2), a rotor magnetic bridge (2.3) and inner ring rotor teeth (2.4), wherein the rotor air magnetic barrier (2.2) is located between the outer ring rotor teeth (2.1) and the inner ring rotor teeth (2.4); The inner stator (3) comprises inner stator teeth (3.1), an inner stator integrated winding (3.2), a low coercive force permanent magnet (3.3) and an inner stator yoke (3.4); the inner stator yoke (3.4) is located at the innermost layer of the motor, the inner stator teeth (3.1) are located on the outside of the inner stator yoke (3.4), and the inner stator integrated winding (3.2) is located in the space of the inner stator teeth (3.1).

2. The integrated winding dual-stator variable flux permanent magnet motor according to claim 1, characterized in that: The stator teeth where the high coercive force permanent magnets (1.1) of the outer stator (1) are located and the stator teeth of the iron core poles are arranged alternately, and the width of the stator teeth where the high coercive force permanent magnets (1.1) are located is greater than the width of the stator teeth of the iron core poles.

3. The integrated winding dual-stator variable flux permanent magnet motor according to claim 1, characterized in that: The stator teeth where the low coercive force permanent magnets (3.3) of the inner stator (3) are located and the stator teeth of the iron core poles are arranged alternately, and the width of the stator teeth where the low coercive force permanent magnets (3.3) are located is greater than the width of the stator teeth of the iron core poles.

4. The integrated winding dual-stator variable flux permanent magnet motor according to claim 2, characterized in that: The outer stator armature winding (1.2) is connected into a three-phase winding, and the inner stator integrated winding (3.2) adopts an open winding structure; The outer stator armature winding (1.2) and the inner stator integrated winding (3.2) are independent of each other and are not connected in series or in parallel.

5. The integrated winding dual-stator variable flux permanent magnet motor according to claim 1, characterized in that: The outer stator (1) uses a high-coercive force permanent magnet, and the inner stator (3) uses a low-coercive force permanent magnet. The outer stator (1) and the inner stator (3) are a hybrid permanent magnet structure. When a bias DC current is passed through the integrated winding of the inner stator, the magnetization level of the low-coercive force permanent magnet can be adjusted.

6. The integrated winding dual-stator variable flux permanent magnet motor according to claim 1, characterized in that: The motor body (6) enlarges the ratio of the inner stator (3) part to the outer stator (1) part, so that the inner stator (3) part accounts for a higher proportion, and the magnetic adjustment range of the motor is wider. Therefore, the magnetic adjustment range of the motor can be adjusted by adjusting the ratio of the inner and outer stator sizes.

7. The integrated winding dual-stator variable flux permanent magnet motor according to claim 1, characterized in that: The intermediate rotor (2) is provided with an air gap magnetic barrier which effectively isolates the influence of the high coercive force permanent magnet on the low coercive force permanent magnet, thereby improving the magnetic stability of the low coercive force permanent magnet.

8. The integrated winding dual-stator variable flux permanent magnet motor according to claim 1, characterized in that: The motor of the outer stator (1) and the motor of the inner stator (3) can be independently regarded as two motors with different pole-slot combinations.

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