Magnetic resistance auxiliary type permanent magnet vernier motor

Abstract

The invention belongs to the technical field of motor equipment, and particularly relates to a reluctance-assisted permanent magnet vernier motor. The magnetic resistance auxiliary type permanent magnet vernier motor comprises a stator structure which comprises a stator iron core with a mounting cavity, an armature winding and a plurality of first permanent magnets, and the first permanent magnets are located in a stator notch and arranged at intervals in the circumferential direction of the stator iron core; the rotor structure comprises a rotor iron core located in the mounting cavity and a rotor shaft connected with the rotor iron core, and a gap is formed between the side surface of the rotor iron core and the inner wall of the mounting cavity; the edge of the rotor core is provided with a plurality of magnetic barrier groups for generating reluctance torque, the plurality of magnetic barrier groups are arranged at intervals along the circumferential direction of the rotor core, the side surface of the rotor core is also provided with a plurality of rotor slots for generating permanent magnet torque based on a magnetic field modulation effect, and the plurality of rotor slots are also arranged at intervals along the circumferential direction of the rotor core. Through effective superposition of the permanent magnet torque and the reluctance torque, the overall torque density and the output torque of the motor are improved.

Description

Technical Field

[0001] This invention belongs to the field of motor equipment technology, and in particular relates to a reluctance-assisted permanent magnet vernier motor. Background Technology

[0002] Currently, permanent magnet motors, as electromagnetic energy conversion devices, are widely used in industrial production and household appliances, such as electric vehicles, wind power generation, and washing machines. In low-speed, high-torque applications such as wind power generation, permanent magnet motors are desired to have high torque density and efficiency to eliminate the defects caused by intermediate transmission devices such as gearboxes, thereby enabling direct drive of the load.

[0003] To meet the growing demand for high torque performance in industrial production, permanent magnet vernier motors based on the magnetic gear effect have become a research hotspot. Although scholars have studied many different topologies to improve the torque density of permanent magnet vernier motors, from the perspective of torque generation, these motors utilize the combined effect of modulated fundamental and harmonic magnetic fields to generate torque, and are essentially still permanent magnet torques. Therefore, there is still considerable room for improvement in the torque density of permanent magnet vernier motors.

[0004] As is well known, the torque of permanent magnet motors is divided into two types: permanent magnet torque and reluctance torque. Since the reluctance torque of permanent magnet vernier motors is very small, increasing the torque density of permanent magnet vernier motors by increasing the reluctance torque is one of the feasible research directions. Summary of the Invention

[0005] The purpose of this application is to provide a reluctance-assisted permanent magnet vernier motor, which aims to solve the problem of how to improve the output torque and torque density of the motor.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] A reluctance-assisted permanent magnet vernier motor is provided, comprising: A stator structure includes a stator core with mounting cavities, an armature winding for generating an armature magnetic field, and a first permanent magnet for generating an excitation magnetic field. The armature winding is located in a stator slot of the stator core, and the first permanent magnet is located at the slot opening. Multiple armature windings and the first permanent magnet are arranged at circumferential intervals along the stator core. The rotor structure includes a rotor core located within the mounting cavity and a rotor shaft connected to the rotor core, wherein there is a gap between the side surface of the rotor core and the inner wall of the mounting cavity; The rotor core has magnetic barrier groups on its edge, and multiple magnetic barrier groups are arranged at intervals along the circumference of the rotor core. The side surface of the rotor core also has rotor slots that generate permanent magnet torque based on magnetic field modulation effect, and multiple rotor slots are also arranged at intervals along the circumference of the rotor core.

[0008] In some embodiments, the magnetic barrier group includes a first magnetic barrier gap layer and a second magnetic barrier gap layer, wherein the first magnetic barrier gap layer and the second magnetic barrier gap layer are arranged sequentially at intervals along the radial direction of the rotor core.

[0009] In some embodiments, the extension path of the cross-section of the first magnetic barrier gap layer is a straight line, an arc, or an open polygon, and / or the extension path of the cross-section of the second magnetic barrier gap layer is a straight line, an arc, or an open polygon.

[0010] In some embodiments, the second magnetic barrier gap layer is located outside the first magnetic barrier gap layer, and the first magnetic barrier gap layer partially surrounds the second magnetic barrier gap layer.

[0011] In some embodiments, the rotor structure further includes a second permanent magnet located in the second magnetic barrier gap layer. Each second magnetic barrier gap layer is provided with a second permanent magnet. The magnetization direction of the second permanent magnet is parallel to the cross-section of the rotor core, and the magnetization directions of the second permanent magnets in any two adjacent second magnetic barrier gap layers are opposite.

[0012] In some embodiments, each of the second magnetic barrier gap layers is provided with three second permanent magnets, which are arranged in a U-shape.

[0013] In some embodiments, each of the magnetic barrier groups is arranged at equal intervals along the circumference of the rotor core, and each of the rotor slots is arranged at equal intervals along the circumference of the rotor core.

[0014] In some embodiments, the first magnetic barrier gap layer is filled with a non-magnetic material, and / or the second magnetic barrier gap layer is filled with a non-magnetic material.

[0015] In some embodiments, the stator core includes a stator yoke having the mounting cavity and stator teeth located in the mounting cavity and connected to the stator yoke, wherein a plurality of stator teeth are arranged at circumferential intervals along the stator yoke; any two adjacent stator teeth and the stator yoke together define a stator slot, each armature winding is located in each stator slot, and each first permanent magnet is located at the slot opening of each stator slot.

[0016] In some embodiments, the magnetization direction of the first permanent magnet is parallel to the radial direction of the stator core.

[0017] The beneficial effects of this application are as follows: by reasonably designing the magnetic barrier group on the rotor core, the reluctance torque can be introduced into the motor. The reluctance torque is superimposed on the permanent magnet torque. The introduced reluctance torque will not significantly weaken the permanent magnet torque generated by the magnetic field modulation effect, and can significantly improve the torque density. Thus, through the superposition of permanent magnet torque and reluctance torque, the output torque and torque density of the motor are improved. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional schematic diagram of the stator structure and rotor core of the reluctance-assisted permanent magnet vernier motor provided in the embodiments of this application; Figure 2 yes Figure 1 A cross-sectional schematic diagram of the stator core of a reluctance-assisted permanent magnet vernier motor. Figure 3 This is a cross-sectional schematic diagram of a rotor structure provided in another embodiment of this application; Figure 4 This application Figure 1 The embodiment provides a schematic diagram of the total torque of the reluctance-assisted permanent magnet vernier motor, as well as the permanent magnet torque and reluctance torque separated from the total torque.

[0020] The following are the labeling elements in the figure: 100. Reluctance-assisted permanent magnet vernier motor; 10. Stator structure; 11. Stator core; 12. Armature winding; 13. First permanent magnet; 111. Stator teeth; 112. Stator yoke; 113. Stator slot; 20. Rotor structure; 21. Rotor shaft; 22. Rotor core; 221. Rotor teeth; 222. Rotor yoke; 23. Magnetic barrier assembly; 231. First magnetic barrier gap layer; 232. Second magnetic barrier gap layer; 114. Mounting cavity; 211. Rotor slot; 233. Second permanent magnet. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of this application.

[0022] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are for ease of description only, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0023] Please see Figures 1 to 4 This application provides a reluctance-assisted permanent magnet vernier motor 100, which enables the permanent magnet torque and reluctance torque to be superimposed, thereby improving the output torque and torque density of the reluctance-assisted permanent magnet vernier motor 100.

[0024] Please see Figures 1 to 4 The reluctance-assisted permanent magnet vernier motor 100 includes a stator structure 10 and a rotor structure 20.

[0025] Please see Figures 1 to 4 The stator structure 10 includes a stator core 11 with a mounting cavity 114, an armature winding 12 for generating an armature magnetic field, and a first permanent magnet 13 for generating an excitation magnetic field. The armature winding 12 is located in the stator slot 113 of the stator core 11, and the first permanent magnet 13 is located at the slot opening of the stator slot 113. Multiple armature windings 12 and first permanent magnets 13 are arranged circumferentially at intervals from the stator core 11. It is understood that the first permanent magnet 13 can be an AlNiCo permanent magnet alloy, an IronChromiumCo permanent magnet alloy, a permanent magnet ferrite, a rare earth permanent magnet material, or a composite permanent magnet material, etc., and is not limited here; it can be selected according to the actual situation.

[0026] Please see Figures 1 to 4 The rotor structure 20 includes a rotor core 22 located in the mounting cavity 114 and a rotor shaft 21 connected to the rotor core 22. The rotor shaft 21 passes through the mounting cavity 114 and is connected to the center position of the rotor core 22. There is a gap between the side surface of the rotor core 22 and the inner wall of the mounting cavity 114.

[0027] Please see Figures 1 to 4The rotor core 22 has magnetic barrier groups 23 formed along its edge, and rotor slots 211, which generate permanent magnet torque based on the magnetic field modulation effect, are also formed on the side surface of the rotor core 22. Multiple magnetic barrier groups are arranged at intervals along the circumference of the rotor core 22, and multiple rotor slots 211 are also arranged at intervals along the circumference of the rotor core 22. It can be understood that by setting multiple magnetic barrier groups 23, the motor can generate reluctance torque based on the reluctance effect; and by forming rotor slots 211, the motor can generate permanent magnet torque based on the magnetic field modulation effect.

[0028] Please see Figures 1 to 4 The reluctance-assisted permanent magnet vernier motor 100 provided in this application introduces reluctance torque into the rotor core 22 by creating magnetic barrier groups 23 at the edge of the rotor core 22. The presence of the magnetic barrier groups 23 causes the rotor structure 20 to generate additional reluctance torque during motor operation. By setting the rotor slots 211, the motor can simultaneously generate permanent magnet torque using the magnetic field modulation effect; the effective superposition of permanent magnet torque and reluctance torque can improve the overall torque density and output torque of the motor.

[0029] Please see Figure 1 It is understood that the rotor core 22 includes a rotor yoke 222 and rotor teeth 221 arranged on the side surface of the rotor yoke 222. Any two adjacent rotor teeth 221 and rotor yoke 222 jointly define a rotor slot 211. The rotor teeth 221 can serve as auxiliary magnetic flux modulation teeth, which increases the change in magnetic permeability on the air gap side, enhances the modulation effect efficiency of the air gap magnetic field, enriches the effective harmonic components in the air gap magnetic flux density, and effectively improves the torque generated by the magnetic field modulation effect.

[0030] It is understandable that the magnetic barrier group 23 can be a hollow area opened on the rotor core 22, such as a single-layer gap or multiple single-layer gaps, with the multiple single-layer gaps arranged sequentially at intervals along the radial direction of the rotor core 22.

[0031] Please see Figures 1 to 4 In some embodiments, the magnetic barrier group 23 includes a first magnetic barrier gap layer 231 and a second magnetic barrier gap layer 232, which are arranged sequentially at intervals along the radial direction of the rotor core 22.

[0032] Optionally, by setting a first magnetic barrier gap layer 231 and a second magnetic barrier gap layer 232 arranged radially at intervals, a multi-layer magnetic barrier structure is formed, which can guide the magnetic flux path inside the rotor core 22, thereby enhancing the reluctance effect and generating a larger reluctance torque component. The multi-layer structure can make more effective use of the volume of the rotor core 22, further improving the output torque without increasing the size of the motor.

[0033] It is understandable that the magnetic barrier group 23 may also include a third magnetic barrier gap layer, a fourth magnetic barrier gap layer... and an Nth magnetic barrier gap layer arranged in sequence at intervals.

[0034] Please see Figures 1 to 4 In some embodiments, the extension path of the cross-section of the first magnetic barrier gap layer 231 is a straight line, an arc, or an open polygon.

[0035] It is understood that when the extension path of the cross-section of the first magnetic barrier gap layer 231 is straight, the cross-section of the first magnetic barrier gap layer 231 is rectangular; when the extension path of the cross-section of the first magnetic barrier gap layer 231 is arc-shaped, the cross-section of the first magnetic barrier gap layer 231 is semi-annular. In this embodiment, the extension path of the cross-section of the first magnetic barrier gap layer 231 is an open polygon.

[0036] Optionally, the first magnetic barrier gap layer 231 can be configured as a straight line, an arc, or a polygon, so that the geometry of the first magnetic barrier gap layer 231 can be optimized according to the distribution law of magnetic field lines (e.g., U-shaped or C-shaped to fit the magnetic flux direction), which helps to reduce leakage flux and local magnetic saturation in the magnetic circuit, reduce iron loss, and improve the operating efficiency of the motor. At the same time, a reasonable shape design can also improve the mechanical stress distribution of the rotor structure 20 and enhance the structural stability of the rotor during rotation.

[0037] Please see Figures 1 to 4 In some embodiments, the extension path of the cross-section of the second magnetic barrier gap layer 232 is a straight line, an arc, or an open polygon.

[0038] It is understood that when the extension path of the cross-section of the second magnetic barrier gap layer 232 is straight, the cross-section of the second magnetic barrier gap layer 232 is rectangular; when the extension path of the cross-section of the second magnetic barrier gap layer 232 is arc-shaped, the cross-section of the second magnetic barrier gap layer 232 is semi-annular. In this embodiment, the extension path of the cross-section of the second magnetic barrier gap layer 232 is an open polygon.

[0039] Optionally, the second magnetic barrier gap layer 232 can be configured as a straight line, an arc, or a polygon, so that the geometry of the first magnetic barrier gap layer 231 can be optimized according to the distribution law of magnetic field lines (e.g., U-shaped or C-shaped to fit the magnetic flux direction), which helps to reduce leakage flux and local magnetic saturation in the magnetic circuit, reduce iron loss, and improve the operating efficiency of the motor. At the same time, a reasonable shape design can also improve the mechanical stress distribution of the rotor structure 20 and enhance the structural stability of the rotor during rotation.

[0040] In this embodiment, the cross-sectional shape of the first magnetic barrier gap layer 231 and the cross-sectional shape of the second magnetic barrier gap layer 232 are open polygons, i.e., U-shaped arrangements. In other embodiments, the shapes can be selected according to the actual situation, and no restrictions are imposed here.

[0041] Please see Figures 1 to 4 In some embodiments, the second magnetic barrier gap layer 232 is located outside the first magnetic barrier gap layer 231, and the first magnetic barrier gap layer 231 partially surrounds the second magnetic barrier gap layer 232.

[0042] Optionally, the second magnetic barrier gap layer 232 is disposed outside the first magnetic barrier gap layer 231, forming a nested magnetic barrier distribution structure, which can maximize the use of the radial space of the rotor core 22 and form a multi-layer magnetic flux barrier. This nested structure forces the magnetic lines of force to pass through along a low magnetic reluctance path, maximizing the magnetic anisotropy of the rotor structure 20, thereby ensuring the maximization of magnetic reluctance torque.

[0043] Please see Figures 1 to 4 In some embodiments, the width of the first magnetic barrier gap layer 231 is greater than the width of the second magnetic barrier gap layer 232.

[0044] It is understandable that by making the first magnetic barrier gap layer 231 near the center of the rotor core 22 wider, the magnetic flux penetrating deep into the rotor core 22 can be effectively blocked, thereby increasing the reluctance torque of the motor. At the same time, by making the outer first magnetic barrier gap layer 231 relatively narrow, sufficient magnetic core channels can be retained to avoid magnetic circuit saturation, and more mechanical support structures can be retained on the outer edge of the rotor core 22. Thus, while increasing the torque density, the mechanical strength of the rotor structure 20 is also taken into account to withstand the rotational centrifugal force.

[0045] It is understood that the width of the first magnetic barrier gap layer 231 can also be equal to the width of the second magnetic barrier gap layer 232. There is no restriction here, and it can be selected according to the actual situation.

[0046] Please see Figure 3 In some embodiments, the rotor structure 20 further includes a second permanent magnet 233 located in the second magnetic barrier gap layer 232. Each second magnetic barrier gap layer 232 is provided with a second permanent magnet 233. The magnetization direction of the second permanent magnet 233 is parallel to the cross-section of the rotor core 22, and the magnetization directions of the second permanent magnets 233 in any two adjacent second magnetic barrier gap layers 232 are opposite.

[0047] Please see Figure 3Optionally, in this embodiment, the magnetization direction of the second permanent magnet 233 can be along the radial direction of the rotor core 22 and outward, or the magnetization direction of the second permanent magnet 233 can be along the radial direction of the rotor core 22 and inward, and a pair of magnetic poles are formed between two adjacent second permanent magnets 233, thereby improving the output torque.

[0048] Please see Figure 3 In some embodiments, each of the second magnetic barrier gap layers 232 is provided with three second permanent magnets 233, which are arranged in a U-shape. It is understood that along the extension direction of the U-shape, the three second permanent magnets 233 can be connected sequentially or arranged intermittently; this is not limited and can be selected according to the actual situation. In this embodiment, the three second permanent magnets 233 are arranged at intervals, and the three second permanent magnets 233 are arranged in a U-shape overall.

[0049] Please see Figure 3 It is understandable that by arranging the three second permanent magnets 233 in a U-shape within the second magnetic barrier gap layer 232, with the middle second permanent magnet 233 located at the bottom of the U-shape and the two second permanent magnets 233 located at both ends on both sides of the U-shape, the output torque is further improved.

[0050] Please see Figure 3 Optionally, the three second permanent magnets 233 located in the same second magnetic barrier gap layer 232 have their magnetization direction pointing towards the inside of the U-shape or towards the outside of the U-shape.

[0051] In some embodiments, each of the magnetic barrier groups 23 is arranged at equal intervals along the circumference of the rotor core 22, and each of the rotor slots 211 is arranged at equal intervals along the circumference of the rotor core 22.

[0052] Optionally, the number of magnetic barrier groups 23 can be the same as the number of rotor slots 211, and the magnetic barrier groups 23 and rotor slots 211 are respectively set in a one-to-one correspondence. Alternatively, the number of magnetic barrier groups 23 can be different from the number of rotor slots 211, and the number of magnetic barrier groups 23 can be greater than the number of rotor slots 211. There is no restriction here, and the choice can be made according to the actual situation.

[0053] Optionally, the stator core 11 is formed by stacking high-permeability silicon steel sheets sequentially along the axial direction.

[0054] The rotor core 22 and the magnetic barrier assembly 23 are integrally formed, thereby simplifying the assembly process. They are also made of high-permeability silicon steel sheets stacked sequentially along the axial direction.

[0055] Optionally, the first permanent magnet 13 is made of neodymium iron boron permanent magnet material with high magnetic energy product.

[0056] In some embodiments, the first magnetic barrier gap layer 231 is filled with a non-magnetic material.

[0057] Optionally, non-magnetic material is filled into the first magnetic barrier gap layer 231, which strengthens the mechanical strength of the rotor core 22, prevents the rotor core 22 from being deformed or damaged by centrifugal force during high-speed rotation, and improves the reliability of the motor.

[0058] Non-magnetic materials have extremely low permeability, such as epoxy resin, which can ensure continuous and effective blocking of magnetic field lines and maintain high magnetoresistance characteristics.

[0059] Please see Figures 1 to 4 In some embodiments, the second magnetic barrier gap layer 232 is filled with a non-magnetic material.

[0060] Optionally, non-magnetic material is filled into the second magnetic barrier gap layer 232, which strengthens the mechanical strength of the rotor core 22, prevents the rotor core 22 from being deformed or damaged by centrifugal force during high-speed rotation, and improves the reliability of the motor.

[0061] Non-magnetic materials have extremely low permeability, such as epoxy resin, which can ensure continuous and effective blocking of magnetic field lines and maintain high magnetoresistance characteristics.

[0062] Please see Figures 1 to 2 In some embodiments, the stator core 11 includes a stator yoke 112 having the mounting cavity 114 and stator teeth 111 located in the mounting cavity 114 and connected to the stator yoke 112. The stator teeth 111 are arranged in multiple circumferentially along the stator yoke 112. Any two adjacent stator teeth 111 and the stator yoke 112 jointly define a stator slot 113. Each armature winding 12 is located in each stator slot 113, and each first permanent magnet 13 is located at the slot opening of each stator slot 113.

[0063] Please see Figures 1 to 2 Optionally, the cooperation between the rotor teeth 221 and the rotor slots 211 can achieve the magnetic field modulation effect of the permanent magnet vernier motor. The rotor teeth 221 act as a magnetic field modulator, modulating the magnetic field generated by the first permanent magnet 13 to match the fundamental magnetic field generated by the armature winding 12, thereby generating permanent magnet torque. The magnetic barrier group 23 on the rotor structure 20 has a magnetoresistance effect. Under the action of the magnetoresistance effect, the inductance of the motor changes significantly with the position angle of the rotor core 22, thus introducing magnetoresistance torque into the motor. With the support of the magnetic field modulation effect and the magnetoresistance effect, the permanent magnet torque and the magnetoresistance torque can be effectively superimposed, enabling the motor provided in this embodiment to achieve a large torque output.

[0064] Please see Figures 1 to 4 Each stator slot 113 is arranged at equal intervals on the stator core 11, thereby each armature winding 12 is arranged at equal intervals on the stator core 11, and each first permanent magnet 13 is also arranged at equal intervals on the stator core 11, so that the magnetic field of each magnetic pole region is evenly distributed, which helps to reduce cogging torque and vibration, and improve the stability and operating accuracy of the reluctance-assisted permanent magnet vernier motor 100.

[0065] It is understandable that the armature winding 12 is arranged in the stator slot 113 according to the number of pole pairs and is supplied with symmetrical alternating current.

[0066] In some embodiments, the magnetization direction of the first permanent magnet 13 is parallel to the radial direction of the stator core 11. The first permanent magnet 13 can be magnetized towards the inside of the mounting cavity 114 or towards the outside of the mounting cavity 114. There is no limitation here, and the choice can be made according to the actual situation.

[0067] Optionally, setting the magnetization direction of the first permanent magnet 13 to be parallel to the radial direction of the stator core 11 is beneficial to enhancing the magnetic field modulation effect of the stator teeth 111 and increasing the permanent magnet torque.

[0068] The reluctance-assisted permanent magnet vernier motor provided in this application can introduce reluctance torque into the motor by reasonably designing a magnetic barrier group on the rotor core 22. The reluctance torque is superimposed on the permanent magnet torque. The introduced reluctance torque will not significantly weaken the permanent magnet torque generated by the magnetic field modulation effect, but can significantly increase the torque density, thereby improving the output torque and torque density of the motor.

[0069] Understandably, by integrating the magnetic barrier group 23 for generating reluctance torque and the rotor slot for enhancing the vernier magnetic field modulation effect, the superposition of permanent magnet torque and reluctance torque is achieved. This allows the motor to utilize the high-density permanent magnet torque generated by the first permanent magnet 13 and the armature winding through the magnetic field modulation effect, while also making full use of the interaction between the stator magnetic field and the rotor reluctance to superimpose reluctance torque. This enables the motor to improve torque density and output torque under the same volume and current.

[0070] like Figure 4 As can be seen, in this embodiment, the values ​​of the permanent magnet torque and reluctance torque relative to the total torque (the reference value of the total torque is 0.957) are 0.549 and 0.408, respectively, and the reluctance torque accounts for 42.6% of the total torque. This indicates that the embodiment of the present invention successfully introduces reluctance torque by reasonably setting the magnetic barrier group 23 on the rotor core 22. Under the superposition of permanent magnet torque and reluctance torque, the output torque and torque density of the reluctance-assisted permanent magnet vernier motor 100 can be further improved.

[0071] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A reluctance-assisted permanent magnet vernier motor, characterized in that: include: A stator structure includes a stator core with mounting cavities, an armature winding for generating an armature magnetic field, and a first permanent magnet for generating an excitation magnetic field. The armature winding is located in a stator slot of the stator core, and the first permanent magnet is located at the slot opening. Multiple armature windings and the first permanent magnet are arranged at circumferential intervals along the stator core. The rotor structure includes a rotor core located within the mounting cavity and a rotor shaft connected to the rotor core, wherein there is a gap between the side surface of the rotor core and the inner wall of the mounting cavity; The rotor core has magnetic barrier groups on its edge, and multiple magnetic barrier groups are arranged at intervals along the circumference of the rotor core. The side surface of the rotor core also has rotor slots that generate permanent magnet torque based on magnetic field modulation effect, and multiple rotor slots are also arranged at intervals along the circumference of the rotor core.

2. The reluctance-assisted permanent magnet vernier motor according to claim 1, characterized in that: The magnetic barrier group includes a first magnetic barrier gap layer and a second magnetic barrier gap layer, which are arranged sequentially at intervals along the radial direction of the rotor core.

3. The reluctance-assisted permanent magnet vernier motor according to claim 2, characterized in that: The extension path of the cross-section of the first magnetic barrier gap layer is a straight line, an arc, or an open polygon, and / or the extension path of the cross-section of the second magnetic barrier gap layer is a straight line, an arc, or an open polygon.

4. The reluctance-assisted permanent magnet vernier motor according to claim 2, characterized in that: The second magnetic barrier gap layer is located outside the first magnetic barrier gap layer, and the first magnetic barrier gap layer partially surrounds the second magnetic barrier gap layer.

5. The reluctance-assisted permanent magnet vernier motor according to any one of claims 2-4, characterized in that: The rotor structure also includes a second permanent magnet located in the second magnetic barrier gap layer. Each second magnetic barrier gap layer is provided with a second permanent magnet. The magnetization direction of the second permanent magnet is parallel to the cross-section of the rotor core, and the magnetization directions of the second permanent magnets in any two adjacent second magnetic barrier gap layers are opposite.

6. The reluctance-assisted permanent magnet vernier motor according to claim 5, characterized in that: Each of the second magnetic barrier gap layers is provided with three second permanent magnets, which are arranged in a U-shape.

7. The reluctance-assisted permanent magnet vernier motor according to any one of claims 1-4, characterized in that: Each of the magnetic barrier groups is arranged at equal intervals along the circumference of the rotor core, and each of the rotor slots is arranged at equal intervals along the circumference of the rotor core.

8. The reluctance-assisted permanent magnet vernier motor according to any one of claims 1-4, characterized in that: The first magnetic barrier gap layer is filled with a non-magnetic material, and / or the second magnetic barrier gap layer is filled with a non-magnetic material.

9. The reluctance-assisted permanent magnet vernier motor according to any one of claims 1-4, characterized in that: The stator core includes a stator yoke having the mounting cavity and stator teeth located in the mounting cavity and connected to the stator yoke. The stator teeth are arranged in multiple circumferentially along the stator yoke. Any two adjacent stator teeth and the stator yoke together define a stator slot. Each armature winding is located in each stator slot, and each first permanent magnet is located at the slot opening of each stator slot.

10. The reluctance-assisted permanent magnet vernier motor according to any one of claims 1-4, characterized in that: The magnetization direction of the first permanent magnet is parallel to the radial direction of the stator core.

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