Stator-rotor structure and motor having the same

Abstract

The application provides a kind of stator-rotor structure and motor with it, comprising: rotor, including rotor core and rotor magnetic steel, rotor magnetic steel is installed on rotor core;Stator core, sleeve is set on rotor core, stator core includes annular stator yoke and multiple stator teeth, multiple stator teeth are arranged in the inner ring of stator yoke along the circumferential direction of stator yoke;Residual magnetism of rotor magnetic steel is Br, the minimum distance of adjacent two stator teeth is w1, the maximum distance is w2;Wherein, 1.14T≤Br≤1.42T, 34.6≤Br*(w1+w2)≤44.3.The scheme provided by the application can solve the problem of large torque ripple of motor in the prior art.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a stator-rotor structure and a motor having the same. Background Technology

[0002] Currently, cogging torque is a unique phenomenon in permanent magnet motors, primarily caused by stator and rotor core structure issues, and is the main cause of torque pulsation. After slotting the stator core, the rotor magnets interact with the corresponding slotted structure, resulting in uneven tangential tension on the rotor at various positions. This causes the rotor to tend to stop at certain stable positions, forming periodic fluctuations in cogging torque. In actual motor operation, cogging torque does not affect the average torque, but it does cause torque pulsation. Furthermore, rotor magnets made of high remanence materials are increasingly widely used in permanent magnet synchronous motors.

[0003] However, in permanent magnet synchronous motors using rotor magnets made of high remanence materials, the harmonic content of the air gap magnetic flux density between the stator and rotor is much higher than that in ferrite motors with lower remanence, increasing the difficulty of torque ripple optimization. When the stator core tooth width is too wide or too narrow, it will lead to an increase in the harmonic content of the air gap magnetic flux density, which in turn will increase torque ripple, affecting the stability of motor operation and noise. Summary of the Invention

[0004] The main objective of this invention is to provide a stator and rotor structure and a motor having the same, so as to solve the problem of large torque ripple in existing motors.

[0005] To achieve the above objectives, according to one aspect of the present invention, a stator-rotor structure is provided, comprising:

[0006] The rotor consists of rotor magnets and a rotor core, with the rotor magnets mounted on the rotor core.

[0007] The stator core is fitted onto the rotor core. The stator core includes an annular stator yoke and multiple stator teeth. The multiple stator teeth are spaced apart along the circumference of the stator yoke in the inner ring of the stator yoke. The remanence of the rotor magnet is Br. The minimum distance between two adjacent stator teeth is w1 and the maximum distance is w2.

[0008] Among them, 1.14T≤Br≤1.42T, 34.6≤Br*(w1+w2)≤44.3.

[0009] Furthermore, the inner diameter of the stator core is r1, and the outer diameter of the stator core is r2;

[0010] Among them, 0.48≤w1 / (r2-r1)≤0.493, 0.93≤w2 / (r2-r1)≤0.95.

[0011] Furthermore, the rotor core is provided with a mounting groove, and the rotor magnet is installed in the mounting groove. The rotor magnet includes a first magnetic component and a second magnetic component connected at a preset angle. The first end of the first magnetic component is connected to the first end of the second magnetic component. The side of the second end of the first magnetic component near the second magnetic component forms a first plane with the center of the rotor core. The side of the second end of the second magnetic component near the first magnetic component forms a second plane with the center of the rotor core. The included angle between the first plane and the second plane is α, and the number of pole pairs of the rotor is p.

[0012] Where 126° / p≤α≤135° / p.

[0013] Furthermore, the rotor core is provided with an installation groove, and the rotor magnet is installed in the installation groove. Magnetic bridges are provided at both ends of the installation groove near the outer periphery of the rotor core. The side of the magnetic bridge near the outer periphery of the rotor core is equally spaced from the outer periphery of the rotor core.

[0014] Furthermore, the distance between the magnetic bridge and the outer periphery of the rotor core is d, 0.5mm≤d≤0.6mm; and / or,

[0015] The mounting slot has an axisymmetric structure, and the two magnetic bridges located at both ends of the mounting slot near the outer edge of the rotor core are symmetrically arranged with respect to the axis of symmetry of the mounting slot.

[0016] Furthermore, the rotor magnet includes a first magnetic component and a second magnetic component connected at a preset angle; the rotor core is provided with a mounting groove, the rotor magnet is installed in the mounting groove, and magnetic bridges are provided at both ends of the mounting groove near the outer periphery of the rotor core.

[0017] The distance between the center of the rotor core and the connection position of the first magnetic component and the second magnetic component is d1, the outer diameter of the rotor core is r, and the distance between the magnetic bridge and the outer periphery of the rotor core is d; 0.742≤d1 / (rd)≤0.821.

[0018] Furthermore, the rotor magnet includes a first magnetic component and a second magnetic component connected at a preset angle. The first end of the first magnetic component is connected to the first end of the second magnetic component. The side of the second end of the first magnetic component near the second magnetic component forms a first plane with the center of the rotor core. The side of the second end of the second magnetic component near the first magnetic component forms a second plane with the center of the rotor core. The included angle between the first plane and the second plane is α. The rotor core is provided with a mounting groove, and the rotor magnet is installed in the mounting groove. Magnetic bridges are provided at both ends of the mounting groove near the outer periphery of the rotor core. The mounting groove has a concave side and a convex side arranged opposite to each other. The concave side is arranged facing the outer edge of the rotor core. The included angle between the portion of the magnetic bridge protruding from the concave side and the concave side is β.

[0019] Where 0.6≤α / β≤0.75.

[0020] Furthermore, the rotor core is provided with a mounting groove, and the rotor magnet is installed in the mounting groove. The mounting groove has an outwardly convex side and an inwardly concave side that are arranged opposite to each other. The inwardly concave side is arranged towards the outer edge of the rotor core. Magnetic bridges are provided at both ends of the mounting groove near the outer periphery of the rotor core. At least part of the magnetic bridge is arranged to protrude from the inwardly concave side.

[0021] The distance between the end of the magnetic bridge near the concave side and the end of the rotor magnet near the rotor core is d2, and the total length of the rotor magnet is m, 0.05≤d2 / m≤0.07.

[0022] Furthermore, the rotor core is provided with a mounting groove, and the rotor magnet is installed in the mounting groove. The rotor magnet includes a first magnetic element and a second magnetic element connected at a preset angle. A portion of the first end of the first magnetic element is connected to a portion of the first end of the second magnetic element, and the other portion of the first end of the first magnetic element is spaced apart from the other portion of the first end of the second magnetic element; and / or,

[0023] The rotor magnets are made of rare earth materials.

[0024] According to another aspect of the present invention, an electric motor is provided, comprising the stator and rotor structure provided above.

[0025] By applying the technical solution of this invention, the first and second widths of the stator core and the remanent magnetization range of the rotor magnets can be adjusted according to the inner and outer diameters of the stator core, thereby reducing motor torque ripple and harmonic content and improving motor drive stability. The technical solution provided by this invention can solve the problem of large torque ripple in existing motors. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 A schematic diagram of the rotor structure of an electric motor according to an embodiment of the present invention is shown;

[0028] Figure 2 A schematic diagram of the rotor of an electric motor provided according to an embodiment of the present invention is shown when the rotor magnets are not installed;

[0029] Figure 3 A partial structural schematic diagram of a rotor provided according to an embodiment of the present invention is shown when rotor magnets are installed;

[0030] Figure 4 A schematic diagram of the structure of a motor provided according to an embodiment of the present invention is shown;

[0031] Figure 5 A schematic diagram of the stator structure of an electric motor according to an embodiment of the present invention is shown;

[0032] Figure 6 A schematic diagram of the magnetic field lines distribution of an existing motor is shown;

[0033] Figure 7 A schematic diagram of the magnetic field line distribution of an electric motor according to an embodiment of the present invention is shown;

[0034] Figure 8 The diagram shows the variation of motor torque ripple with stator slot shape;

[0035] Figure 9 The graph shows the variation of the motor's harmonic content with the stator slot shape;

[0036] Figure 10 A comparison diagram of the back EMF waveforms of a prior art motor and the motor provided in this embodiment is shown;

[0037] Figure 11 A comparison diagram of the output torque of a prior art motor and the motor provided in this embodiment is shown;

[0038] Figure 12 A numerical comparison chart of torque ripple and total harmonic content is shown between a prior art motor and the motor provided in this embodiment;

[0039] Figure 13 A comparison diagram of copper loss and iron loss of a prior art motor and the motor provided in this embodiment is shown;

[0040] Figure 14 A comparison diagram of the actual energy loss of a motor in the prior art and the motor provided in this embodiment is shown.

[0041] The above figures include the following reference numerals:

[0042] 10. Rotor magnet; 11. First magnetic component; 12. Second magnetic component;

[0043] 20. Rotor core; 21. Mounting slot; 211. Outward convex side; 212. Inward concave side; 213. First mounting part; 214. Second mounting part; 22. Magnetic bridge;

[0044] 30. Stator core; 31. Stator yoke; 32. Stator teeth; 33. Stator shoe. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] like Figures 1 to 5 As shown, one embodiment of the present invention provides a stator-rotor structure, which includes a rotor and a stator core 30. The rotor includes a rotor core 20 and rotor magnets 10, the rotor magnets 10 being mounted on the rotor core 20, and the stator core 30 being sleeved on the rotor core 20. The stator core 30 includes an annular stator yoke 31 and a plurality of stator teeth 32, the plurality of stator teeth 32 being spaced apart circumferentially along the inner ring of the stator yoke 31. The remanence of the rotor magnets 10 is Br, and the minimum distance between two adjacent stator teeth 32 is w1, and the maximum distance is w2. Wherein, 1.14T≤Br≤1.42T, 34.6≤Br*(w1+w2)≤44.3.

[0047] The motor provided in this embodiment can adjust the first and second widths of the stator core 30 and the remanent magnet range of the rotor magnet 10 according to the inner and outer diameters of the stator core 30, thereby reducing motor torque pulsation and harmonic content and improving motor drive stability. Specifically, the remanent magnetism of the rotor magnet 10 is the most direct and important factor affecting the motor's excitation capability, but a larger remanent magnetism does not necessarily mean higher motor efficiency. When other conditions remain unchanged, an increase in remanent magnetism increases the motor's back electromotive force, requiring a corresponding reduction in stator slots, w1, and w2. Otherwise, an increase in the magnetic flux density of the stator core 30 will lead to increased iron and mechanical losses, severe motor heating, and ultimately, a decrease in motor efficiency. Conversely, a smaller remanent magnetism in the rotor magnet 10 will also affect motor efficiency. Ensuring that the remanent magnetism of the stator slots and rotor magnet 10 satisfies this relationship guarantees a balance between copper and iron losses in the stator and rotor, thereby improving the actual operating efficiency of the motor.

[0048] It should be noted that in the formula 34.6≤Br*(w1+w2)≤44.3, the units of w1 and w2 are millimeters (mm). Br*(w1+w2) can also be expressed as Br(w1+w2), which is the product of the sum of the minimum and maximum distances and the remanence.

[0049] Specifically, the stator core 30 also includes a stator shoe 33, which is located at the end of the stator tooth 32 away from the stator yoke 31.

[0050] In this embodiment, the inner diameter of the stator core 30 is r1, and the outer diameter is r2. Wherein, 0.48 ≤ w1 / (r2-r1) ≤ 0.493, and 0.93 ≤ w2 / (r2-r1) ≤ 0.95. This configuration optimizes the stator slot shape, reduces the harmonic content of the back EMF waveform, thereby reducing cogging torque and torque ripple, improving motor drive stability, and reducing electromagnetic noise. Furthermore, this configuration ensures that the stator slots have a larger effective slot area, increasing the number of turns in the windings, thus reducing the motor's copper losses and ensuring the utilization rate of the stator core 30.

[0051] In this embodiment, a mounting groove 21 is provided on the rotor core 20, and the rotor magnet 10 is installed in the mounting groove 21. The rotor magnet 10 includes a first magnetic element 11 and a second magnetic element 12 connected at a preset angle. The first end of the first magnetic element 11 is connected to the first end of the second magnetic element 12. The side of the second end of the first magnetic element 11 near the second magnetic element 12 forms a first plane with the center of the rotor core 20. The side of the second end of the second magnetic element 12 near the first magnetic element 11 forms a second plane with the center of the rotor core 20. The included angle between the first plane and the second plane is α, and the number of pole pairs of the rotor is p; wherein, 126° / p≤α≤135° / p. Specifically, when the length and included angle of the rotor magnet 10 are the same, the larger the included angle corresponding to α, the smaller the distance between two adjacent rotor magnets 10, and the greater the core loss at adjacent positions; while the smaller the included angle, the smaller the distance d between the contact position of the two rotor magnets 10 and the rotor center point, and the worse the excitation effect of the motor. When α is within this range, it can both avoid excessive iron core loss and ensure the excitation effect of the motor.

[0052] In this embodiment, a mounting groove 21 is provided on the rotor core 20, and the rotor magnet 10 is installed in the mounting groove 21. Magnetic bridges 22 are provided at both ends of the mounting groove 21 near the outer periphery of the rotor core 20. The side of the magnetic bridge 22 near the outer periphery of the rotor core 20 is equidistant from the outer periphery of the rotor core 20. With this arrangement, by setting the magnetic bridge 22 on the rotor core 20, equidistant from the outer periphery of the magnetic bridge 22, and with a portion of the magnetic bridge 22 protruding from the concave side 212, the shape of the magnetic bridge 22 of the rotor core 20 can be optimized. This improves the air gap magnetic field between the stator and rotor in the motor, making the air gap magnetic flux density waveform more sinusoidal, reducing the harmonic content in the air gap magnetic flux density, reducing motor leakage flux, thereby optimizing motor torque pulsation and improving motor efficiency.

[0053] In this embodiment, the distance between the magnetic bridge 22 and the outer periphery of the rotor core 20 is d, where 0.5mm ≤ d ≤ 0.6mm. When d is within this range, the excitation effect of the motor can be guaranteed, the processing difficulty can be reduced, and the structural strength can be guaranteed. Specifically, when d is less than 0.5mm, the rotor is prone to structural deformation during motor operation, and when d is greater than 0.6mm, the excitation effect of the motor will be reduced.

[0054] In this embodiment, the rotor magnet 10 includes a first magnetic element 11 and a second magnetic element 12 connected at a preset angle, with the first end of the first magnetic element 11 connected to the first end of the second magnetic element 12. The distance between the center of the rotor core 20 and the connection point of the first magnetic element 11 and the second magnetic element 12 is d1, and the outer diameter of the rotor core 20 is r, where 0.742 ≤ d1 / (rd) ≤ 0.821. Specifically, when the length and included angle of the rotor magnets 10 are the same, the greater the distance d1 between the contact point of two rotor magnets 10 located on the same pole and the rotor center point, the stronger the excitation capability of the motor; the smaller d1, the weaker the excitation capability of the motor. When d1 is within this range, adjacent magnetic poles of different poles will not cross due to excessive magnet length or exceed the rotor outer diameter, nor will the motor efficiency be reduced due to too small a distance.

[0055] In this embodiment, the rotor magnet 10 includes a first magnetic element 11 and a second magnetic element 12 connected at a preset angle. The first end of the first magnetic element 11 is connected to the first end of the second magnetic element 12. The side of the second end of the first magnetic element 11 near the second magnetic element 12 forms a first plane with the center of the rotor core 20. The side of the second end of the second magnetic element 12 near the first magnetic element 11 forms a second plane with the center of the rotor core 20. The included angle between the first plane and the second plane is α. A mounting groove 21 is provided on the rotor core 20. The rotor magnet 10 is installed in the mounting groove 21. Magnetic bridges 22 are provided at both ends of the mounting groove 21 near the outer periphery of the rotor core 20. The mounting groove 21 has a concave side 212 and a convex side 211 arranged opposite to each other. The concave side 212 faces the outer edge of the rotor core 20. The included angle between the portion of the magnetic bridge 22 protruding from the concave side 212 and the concave side 212 is β. 0.6≤α / β≤0.75. Specifically, the magnetic bridge 22 protrudes inward, causing the magnetic lines of force to shift towards the rotor core 20 according to the tilt angle of the magnetic bridge 22. This convergence of the magnetic lines of force improves the rotor's excitation capability. When the offset angle β is small, the radial span of the magnetic bridge 22 is large, which affects the air gap magnetic flux density and causes excessive torque pulsation in the motor. When the offset angle is large, the space formed by the outer arc of the magnetic bridge 22 and its edge is small, resulting in a less significant reduction in leakage flux. Setting the offset angle β within this range ensures both minimal torque pulsation and effective reduction in leakage flux.

[0056] Specifically, each mounting groove 21 has a magnetic bridge 22 at both ends. One magnetic bridge 22 is connected to a portion of the concave side 212, and the other magnetic bridge 22 is connected to another portion of the concave side 212. It should be noted that each magnetic bridge 22 has a connecting side, and the concave side 212 has two groove walls set at a preset angle. The two magnetic bridges 22 are correspondingly arranged with the two groove walls, and the connecting side of each magnetic bridge 22 is connected to the corresponding groove wall. The statement that "the angle between the portion of the magnetic bridge 22 protruding from the concave side 212 and the concave side 212 is β" can be understood as: the angle between the connecting side of each magnetic bridge 22 and the corresponding groove wall is β.

[0057] In this embodiment, a mounting groove 21 is provided on the rotor core 20, and the rotor magnet 10 is installed in the mounting groove 21. The mounting groove 21 has an outwardly convex side 211 and an inwardly concave side 212 arranged opposite to each other. The inwardly concave side 212 is arranged towards the outer edge of the rotor core 20. Magnetic bridges 22 are provided at both ends of the mounting groove 21 near the outer periphery of the rotor core 20. At least part of the magnetic bridge 22 protrudes from the inwardly concave side 212. The distance between one end of the magnetic bridge 22 near the inwardly concave side 212 and one end of the rotor magnet 10 near the rotor core 20 is d2. The total length of the rotor magnet 10 is m, and 0.05≤d2 / m≤0.07. Specifically, the portion of the magnetic bridge 22 located on the concave side 212 is mainly used for planning the magnetic field lines. Since the permeability of the rotor core 20 material is much greater than that of air, the magnetic field lines can be distributed on the rotor core 20, avoiding the magnetic bridge 22, thereby changing the path of the magnetic field lines and reducing magnetic leakage at the end of the mounting slot 21. When d2 is small, the portion of the magnetic bridge 22 on the concave side 212 is too small to distribute the magnetic field lines onto the rotor core 20. When d2 is large, the portion of the magnetic bridge 22 on the concave side 212 is too large, reducing the excitation capacity of the rotor magnet 10 and causing a certain decrease in motor efficiency. Setting d2 within the above range ensures both proper planning of the magnetic field lines and high motor efficiency.

[0058] In this embodiment, the mounting slot 21 has an axisymmetric structure, and the two magnetic bridges 22 located at both ends of the mounting slot 21 near the outer edge of the rotor core 20 are symmetrically arranged with respect to the axis of symmetry of the mounting slot 21. This further optimizes the direction of the magnetic field lines of the motor, ensuring that the magnetic flux density variation pattern between two adjacent mounting slots 21 remains consistent, thereby further reducing torque pulsation during motor operation.

[0059] Specifically, the mounting groove 21 is a V-shaped groove, and the mounting groove 21 includes a first mounting part 213 and a second mounting part 214 that are connected to each other. The first magnetic element 11 is installed in the first mounting part 213 and the second magnetic element 12 is installed in the second mounting part 214.

[0060] In this embodiment, the rotor core 20 is provided with a mounting groove 21, and the rotor magnet 10 is installed in the mounting groove 21. The rotor magnet 10 includes a first magnetic element 11 and a second magnetic element 12 connected at a preset angle. A portion of the first end of the first magnetic element 11 is connected to a portion of the first end of the second magnetic element 12, and the other portion of the first end of the first magnetic element 11 and the other portion of the first end of the second magnetic element 12 are spaced apart.

[0061] In this embodiment, the rotor magnet 10 is made of rare earth materials. This allows the rotor magnet 10 to have a large remanence, thereby improving the operating efficiency of the motor.

[0062] Another embodiment of the present invention provides an electric motor that includes the stator and rotor structure described above.

[0063] Figures 6 to 14 A comparison diagram of the motor provided in this embodiment and a motor in the prior art is shown.

[0064] Specifically, from Figure 6 and Figure 7 It can be seen that when the total number of magnetic lines is 15, the effective magnetic flux density of the existing motor stator teeth (32 teeth) is 8, while that of the motor provided in this embodiment is 11, resulting in a 20% increase in effective magnetic flux density.

[0065] Specifically, from Figures 8 to 9 It can be seen that when the difference between the stator and rotor inner diameters is 21.6 mm, within the range of w1 = [10.37, 10.65] and w2 = [20.1, 20.5] mm, the motor torque pulsation does not exceed 10% as w1 and w2 change.

[0066] Specifically, from Figure 10 and Figure 11 It can be seen that the back EMF waveform of the motor provided in this embodiment is smoother than that of the motor in the prior art, and the torque waveform fluctuation is significantly reduced when the average output torque is equal. The torque ripple and harmonic content are calculated, such as... Figure 11 As shown, torque ripple and total harmonic distortion decreased by 51.92% and 5.11%, respectively.

[0067] Specifically, from Figure 12 and Figure 13 As can be seen, compared with existing motors, the copper loss and iron loss of the motor have decreased by approximately 7.3% and 9.6% respectively, and the mechanical loss has decreased by 27.99%; for example... Figure 14 As shown, the overall efficiency of the motor increased by 0.72%, and the motor performance was significantly improved.

[0068] As can be seen from the above description, the above embodiments of the present invention achieve the following technical effects: the stator core 30 slot shape and the rotor magnet 10 position in the rotor are optimized, the structure of the stator and rotor cores 20 is improved, the excitation effect of the motor is improved, the back EMF waveform output by the motor is smoother, the torque pulsation and total harmonic content generated by the motor are reduced, the stability of the motor drive is improved, the copper loss and iron loss generated by the motor in actual operation are balanced, the tooling mechanical loss is reduced, and the performance of the motor is improved.

[0069] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0070] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0071] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0072] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0073] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stator-rotor structure, characterized in that, include: The rotor includes a rotor magnet (10) and a rotor core (20), wherein the rotor magnet (10) is mounted on the rotor core (20); A stator core (30) is sleeved on the rotor core (20). The stator core (30) includes an annular stator yoke (31) and a plurality of stator teeth (32). The plurality of stator teeth (32) are arranged at intervals along the circumference of the stator yoke (31) in the inner ring of the stator yoke (31). The remanence of the rotor magnet (10) is Br. The minimum distance between two adjacent stator teeth (32) is w1 and the maximum distance is w2. Among them, 1.14T≤Br≤1.42T, 34.6≤Br*(w1+w2)≤44.

3.

2. The stator and rotor structure according to claim 1, characterized in that, The inner diameter of the stator core (30) is r1, and the outer diameter of the stator core (30) is r2; Among them, 0.48≤w1 / (r2-r1)≤0.493, 0.93≤w2 / (r2-r1)≤0.

95.

3. The stator and rotor structure according to claim 1, characterized in that, The rotor core (20) is provided with a mounting groove (21), and the rotor magnet (10) is installed in the mounting groove (21). The rotor magnet (10) includes a first magnetic element (11) and a second magnetic element (12) connected at a preset angle. The first end of the first magnetic element (11) is connected to the first end of the second magnetic element (12). The side of the second end of the first magnetic element (11) near the second magnetic element (12) forms a first plane with the center of the rotor core (20). The side of the second end of the second magnetic element (12) near the first magnetic element (11) forms a second plane with the center of the rotor core (20). The included angle between the first plane and the second plane is α. The number of pole pairs of the rotor is p. Where 126° / p≤α≤135° / p.

4. The stator and rotor structure according to claim 1, characterized in that, The rotor core (20) is provided with a mounting groove (21), and the rotor magnet (10) is installed in the mounting groove (21). Magnetic bridges (22) are provided at both ends of the mounting groove (21) near the outer periphery of the rotor core (20). The side of the magnetic bridge (22) near the outer periphery of the rotor core (20) is provided at equal intervals with the outer periphery of the rotor core (20).

5. The stator and rotor structure according to claim 4, characterized in that, The distance between the magnetic bridge (22) and the outer periphery of the rotor core (20) is d, 0.5mm≤d≤0.6mm; and / or, The mounting groove (21) is an axisymmetric structure, and the two magnetic bridges (22) located at both ends of the mounting groove (21) near the outer edge of the rotor core (20) are symmetrically arranged with respect to the axis of symmetry of the mounting groove (21).

6. The stator and rotor structure according to claim 1, characterized in that, The rotor magnet (10) includes a first magnetic component (11) and a second magnetic component (12) connected at a preset angle; the rotor core (20) is provided with a mounting groove (21), the rotor magnet (10) is installed in the mounting groove (21), and magnetic bridges (22) are provided at both ends of the mounting groove (21) near the outer periphery of the rotor core (20); The distance between the center of the rotor core (20) and the connection position of the first magnetic component (11) and the second magnetic component (12) is d1, the outer diameter of the rotor core (20) is r, and the distance between the magnetic bridge (22) and the outer periphery of the rotor core (20) is d; 0.742≤d1 / (rd)≤0.

821.

7. The stator and rotor structure according to claim 1, characterized in that, The rotor magnet (10) includes a first magnetic element (11) and a second magnetic element (12) connected at a predetermined angle. The first end of the first magnetic element (11) is connected to the first end of the second magnetic element (12). The side of the second end of the first magnetic element (11) near the second magnetic element (12) forms a first plane with the center of the rotor core (20). The side of the second end of the second magnetic element (12) near the first magnetic element (11) forms a second plane with the center of the rotor core (20). The first plane and the second plane... The included angle is α; the rotor core (20) is provided with a mounting groove (21), the rotor magnet (10) is installed in the mounting groove (21), and magnetic bridges (22) are provided at both ends of the mounting groove (21) near the outer periphery of the rotor core (20). The mounting groove (21) has an inner concave side (212) and an outer convex side (211) arranged opposite to each other. The inner concave side (212) is arranged towards the outer edge of the rotor core (20), and the included angle between the part of the magnetic bridge (22) protruding from the inner concave side (212) and the inner concave side (212) is β. Where 0.6≤α / β≤0.

75.

8. The stator and rotor structure according to claim 1, characterized in that, The rotor core (20) is provided with a mounting groove (21), and the rotor magnet (10) is installed in the mounting groove (21). The mounting groove (21) has an outwardly convex side (211) and an inwardly concave side (212) arranged opposite to each other. The inwardly concave side (212) is arranged towards the outer edge of the rotor core (20). Magnetic bridges (22) are provided at both ends of the mounting groove (21) near the outer periphery of the rotor core (20). At least part of the magnetic bridge (22) protrudes from the inwardly concave side (212). Wherein, the distance between the end of the magnetic bridge (22) near the concave side (212) and the end of the rotor magnet (10) near the rotor core (20) is d2, and the total length of the rotor magnet (10) is m, 0.05≤d2 / m≤0.

07.

9. The stator and rotor structure according to any one of claims 1 to 8, characterized in that, The rotor core (20) is provided with a mounting groove (21), and the rotor magnet (10) is installed in the mounting groove (21). The rotor magnet (10) includes a first magnetic element (11) and a second magnetic element (12) connected at a preset angle. A portion of the first end of the first magnetic element (11) is connected to a portion of the first end of the second magnetic element (12), and the other portion of the first end of the first magnetic element (11) is spaced apart from the other portion of the first end of the second magnetic element (12); and / or, The rotor magnet (10) is made of rare earth material.

10. An electric motor, characterized in that, The stator and rotor structure includes any one of claims 1 to 9.

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