Magnetic regulating ring structure, magnetic gear assembly and composite motor

Abstract

The present invention provides a magnetic tuning ring structure, a magnetic gear assembly, and a composite motor. The magnetic tuning ring structure comprises multiple modulation units, with adjacent modulation units connected by a connector to form the magnetic tuning ring structure. The magnetic tuning ring structure is disposed within an annular gap defined by a first rotor structure and a second rotor structure. A groove is formed on the side of the modulation unit facing the first rotor structure, with arc-shaped boots formed on either side of the groove. This invention addresses the problem in the prior art that the magnetic tuning ring's iron core has a quasi-rectangular structure, which results in limited magnetic field modulation and severe magnetic flux leakage between the iron cores, reducing the output torque of the magnetic gear assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of non-contact transmission equipment, and in particular to a magnetic adjustment ring structure, a magnetic gear assembly and a composite motor. Background Art

[0002] The magnetic gear assembly usually includes an inner rotor, a magnetic tuning ring and an outer rotor, wherein permanent magnets are provided on the outer circumference of the inner rotor and the inner circumference of the outer rotor, and the magnetic tuning ring is formed by assembling a plurality of iron cores at equal intervals to form a ring structure. However, the iron cores on the existing magnetic tuning ring are rectangular in structure, and the magnetic field modulation effect of the rectangular magnetic tuning ring is limited, and the magnetic flux leakage between the iron cores is serious, which reduces the output torque of the magnetic gear assembly. In addition, during the processing and manufacturing process of the magnetic tuning ring, a magnetic bridge for connecting two adjacent rectangular iron cores needs to be added. However, the above-mentioned magnetic bridge has a relatively serious degree of magnetic leakage due to its unreasonable structure, which causes the output torque of the magnetic gear assembly to further decrease. Summary of the Invention

[0003] The main purpose of the present invention is to provide a magnetic tuning ring structure, a magnetic gear assembly and a composite motor to solve the problem in the prior art that the iron core on the magnetic tuning ring is a rectangular structure, the magnetic field modulation effect of the rectangular structure magnetic tuning ring is limited, and the magnetic leakage between the iron cores is serious, which reduces the output torque of the magnetic gear assembly.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a magnetic tuning ring structure is provided, comprising a plurality of modulation units, wherein two adjacent modulation units are connected by a connecting portion to form a magnetic tuning ring structure, and the magnetic tuning ring structure is arranged in an annular gap surrounded by a first rotor structure and a second rotor structure; wherein a groove structure is formed on a side of the modulation unit facing the first rotor structure, and arc-shaped boots are formed on both sides of the groove structure.

[0005] Furthermore, adjacent arc-shaped boots are connected via a connecting portion.

[0006] Furthermore, the connecting part is made of magnetic conductive material, the two adjacent arc-shaped boots and the connecting part form a magnetic bridge structure, and the end of the arc-shaped boot away from the connecting part forms a bridge head of the magnetic bridge structure, and the connecting part forms the bridge core of the magnetic bridge structure.

[0007] Furthermore, the thickness of the bridge head of the magnetic bridge structure is t1, the thickness from the outer peripheral surface of the modulation unit to the bottom of the arc-shaped shoe is t2, and t1 and t2 satisfy: 0.25≤t1 / t2≤0.3.

[0008] Furthermore, the thickness of the bridge core of the magnetic bridge structure is t3, and t3 satisfies: t3≤0.5mm.

[0009] Furthermore, the groove wall surface of the groove structure is a first arc surface, the curvature radius of the first arc surface is r1, the surface of the arc boot portion facing the second rotor structure and the surface of the connecting portion facing the second rotor structure are smoothly transitioned to form an arc transition surface, and the arc contour line of the arc transition surface is arranged parallel to the magnetic lines of force passing through its interior, the curvature radius of the arc transition surface is r2, and r1 and r2 satisfy: r2=5×r1.

[0010] Furthermore, each modulation unit has a first side and a second side arranged opposite to each other, the angle formed by the first side and the second side of each modulation unit is a1, the angle formed between the first side of one modulation unit and the first side of the other modulation unit in two adjacent modulation units is a2, and a1 and a2 satisfy: 0.4≤a1 / a2≤0.5, and r1 and a1 satisfy: 0.2≤r1 / a1≤0.3.

[0011] Furthermore, the connecting part is made of non-magnetic material, the thickness of the end of the arc-shaped boot away from the connecting part is t4, the thickness from the outer peripheral surface of the modulation unit to the bottom of the arc-shaped boot is t5, and t4 and t5 satisfy: 0.25≤t4 / t5≤0.3.

[0012] Furthermore, the shoe surface of the arc-shaped shoe portion is a second arc surface, the curvature radius of the second arc surface is r3, the groove wall surface of the groove structure is a third arc surface, the curvature radius of the third arc surface is r4, and r3 and r4 satisfy: r3=4×r4.

[0013] Furthermore, each modulation unit has a first side and a second side arranged opposite to each other, the angle formed by the first side and the second side of each modulation unit is a3, the angle formed between the toes of the two arc-shaped boots of each modulation unit is a4, and a3 and a4 satisfy: 0.5≤a3 / a4≤0.6, and r4 and a3 satisfy: 0.2≤r4 / a3≤0.3.

[0014] Furthermore, the connecting portion and the modulation unit are integrally formed.

[0015] According to another aspect of the present invention, a magnetic gear assembly is provided, comprising a first rotor structure, a second rotor structure and a magnetic tuning ring structure, wherein the first rotor structure is sleeved on the outer circumference of the rotating shaft structure, and a first magnetic element is provided on the outer circumference of the first rotor structure; the second rotor structure is sleeved on the outer circumference of the first rotor structure, and a second magnetic element is provided on the inner circumference of the second rotor structure; the magnetic tuning ring structure is provided in an annular gap surrounded by the first magnetic element and the second magnetic element, and the magnetic tuning ring structure is the above-mentioned magnetic tuning ring structure.

[0016] Furthermore, the rotational speed of the first rotor structure is greater than the rotational speed of the magnetic tuning ring structure, and the rotational speed of the second rotor structure is zero.

[0017] Furthermore, the magnetic tuning ring structure and the first magnetic element are arranged with a gap, and the magnetic tuning ring structure and the second magnetic element are arranged with a gap.

[0018] Furthermore, there are multiple first magnetic elements, which are spaced apart along the circumference of the first rotor structure, and / or there are multiple second magnetic elements, which are spaced apart along the circumference of the second rotor structure.

[0019] According to another aspect of the present invention, a composite motor is provided, comprising a magnetic gear assembly, wherein the magnetic gear assembly is the magnetic gear assembly described above.

[0020] By applying the technical solution of the present invention, the structure of the modulation unit is improved so that the modulation unit has a groove structure and two arc-shaped boots. During the operation of the magnetic gear assembly, the groove structure can effectively reduce the variation amplitude of the magnetic density harmonics between the modulation units, thereby minimizing eddy current losses. In addition, since the arc contour line of the edge of the arc-shaped boot is parallel to the magnetic lines of force passing through it, it is ensured that as many magnetic lines of force as possible can pass through smoothly, effectively reducing the leakage flux between two adjacent modulation units, thereby greatly improving the output torque of the magnetic gear assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 A schematic structural diagram showing a magnetic gear assembly installed on a rotating shaft structure according to an optional embodiment of the present invention is shown;

[0023] Figure 2 Shown Figure 1 A schematic diagram of the magnetic modulation ring structure of the magnetic gear assembly in FIG. 1 , in which the connecting portion and the modulation unit are integrally formed;

[0024] Figure 3 Shown Figure 1 A schematic diagram of the magnetic adjustment ring structure of the magnetic gear assembly in FIG. 2 , wherein the connecting portion made of non-magnetic conductive material is omitted;

[0025] Figure 4 Shown Figure 1 The output torque of the magnetic gear assembly changes with t1 / t2;

[0026] Figure 5 Shown Figure 1 The output torque of the magnetic gear assembly changes with a1 / a2;

[0027] Figure 6 Shown Figure 1 The curve of eddy current loss of the magnetic gear assembly changing with r1 / a1;

[0028] Figure 7 Shown Figure 1 The output torque of the magnetic gear assembly changes with r1 / a1;

[0029] Figure 8 A comparison diagram of output torques of a magnetic bridge structure according to an optional embodiment of the present invention and a conventional magnetic bridge structure is shown;

[0030] Figure 9 The figure shows the distribution of magnetic lines of force of a magnetic gear assembly in a magnetic regulating ring structure according to an optional embodiment of the present invention;

[0031] Figure 10 The comparison of radial magnetic flux harmonic distribution at the inner air gap is shown;

[0032] Figure 11 A comparison diagram of output torques of a magnetic tuning ring structure according to an optional embodiment of the present invention and an existing magnetic tuning ring structure is shown.

[0033] The above drawings include the following reference numerals:

[0034] 10. First rotor structure; 11. First magnetic element; 20. Rotating shaft structure; 30. Second rotor structure; 31. Second magnetic element; 40. Magnetic adjustment ring structure; 41. Modulation unit; 411. Groove structure; 412. Arc-shaped boot; 100. Annular gap. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In order to solve the problem in the prior art that the iron core on the magnetic tuning ring is a rectangular structure, the magnetic field modulation effect of the rectangular magnetic tuning ring is limited, and the magnetic leakage between the iron cores is serious, which reduces the output torque of the magnetic gear assembly, the present invention provides a magnetic tuning ring structure, a magnetic gear assembly and a composite motor, wherein the composite motor includes a magnetic gear assembly, and the magnetic gear assembly is the magnetic gear assembly described above and below.

[0037] like Figure 1As shown, the magnetic gear assembly includes a first rotor structure 10, a second rotor structure 30 and a magnetic tuning ring structure 40. The first rotor structure 10 is sleeved on the outer circumference of the rotating shaft structure 20, and a first magnetic element 11 is provided on the outer circumference of the first rotor structure 10; the second rotor structure 30 is sleeved on the outer circumference of the first rotor structure 10, and a second magnetic element 31 is provided on the inner circumference of the second rotor structure 30; the magnetic tuning ring structure 40 is arranged in an annular gap 100 surrounded by the first magnetic element 11 and the second magnetic element 31, and the magnetic tuning ring structure 40 is the magnetic tuning ring structure described above and below.

[0038] It should be noted that, in the present application, the rotational speed of the first rotor structure 10 is greater than the rotational speed of the magnetic tuning ring structure 40 , and the rotational speed of the second rotor structure 30 is zero.

[0039] It should be noted that, in the present application, the magnetic tuning ring structure 40 is provided with a gap between the first magnetic element 11 and the magnetic tuning ring structure 40 is provided with a gap between the second magnetic element 31. In this way, the magnetic gear assembly is ensured to achieve contactless torque transmission.

[0040] like Figure 1 As shown, there are multiple first magnetic elements 11 , which are spaced apart along the circumference of the first rotor structure 10 , and / or there are multiple second magnetic elements 31 , which are spaced apart along the circumference of the second rotor structure 30 .

[0041] Example 1

[0042] like Figure 2 As shown, the magnetic tuning ring structure includes a plurality of modulation units 41, and two adjacent modulation units 41 are connected by a connecting portion to form a magnetic tuning ring structure. The magnetic tuning ring structure is arranged in an annular gap 100 surrounded by the first rotor structure 10 and the second rotor structure 30; wherein, a groove structure 411 is formed on the side of the modulation unit 41 facing the first rotor structure 10, and arc-shaped boots 412 are respectively formed on both sides of the groove structure 411.

[0043] By improving the structure of the modulation unit 41, the modulation unit 41 has a groove structure 411 and two arc-shaped boots 412. During the operation of the magnetic gear assembly, the groove structure 411 can effectively reduce the variation amplitude of the magnetic density harmonics between the modulation units 41, thereby minimizing eddy current losses. In addition, since the arc contour line of the edge of the arc-shaped boot 412 is parallel to the magnetic lines of force passing through it, it is ensured that as many magnetic lines of force as possible can pass through smoothly, effectively reducing the leakage flux between two adjacent modulation units 41, thereby greatly improving the output torque of the magnetic gear assembly.

[0044] It should be noted that in this embodiment, to reduce the difficulty of manufacturing the magnetic tuning ring structure, adjacent arc-shaped boots 412 are optionally connected by a connecting portion. In addition, the connecting portion is integrally formed with the modulation unit 41. This ensures that the magnetic tuning ring structure can be laminated and formed subsequently.

[0045] like Figure 2 As shown, the connecting portion is made of a magnetically conductive material. Two adjacent arcuate boots 412 and the connecting portion form a magnetic bridge structure. The ends of the arcuate boots 412 away from the connecting portion form the bridgehead of the magnetic bridge structure, and the connecting portion forms the core of the magnetic bridge structure. The bridgehead of the magnetic bridge structure has a thickness of t1, and the thickness from the outer peripheral surface of the modulation unit 41 to the bottom of the arcuate boot 412 is t2. The relationship between t1 and t2 satisfies the following: 0.25≤t1 / t2≤0.3. In this way, by optimizing the ratio of the thickness of the bridge head t1 to the thickness of the outer peripheral surface of the modulation unit 41 to the sole of the arc-shaped boot portion 412 t2, it is possible to avoid the inability to guide the magnetic lines of force well due to the ratio of the thickness of the bridge head t1 to the thickness of the outer peripheral surface of the modulation unit 41 to the sole of the arc-shaped boot portion 412 t2 being too small, and it is also possible to avoid the leakage of magnetic flux due to the ratio of the thickness of the bridge head t1 to the thickness of the outer peripheral surface of the modulation unit 41 to the sole of the arc-shaped boot portion 412 t2 being too large.

[0046] like Figure 2 As shown, the thickness of the bridge core of the magnetic bridge structure is t3, and t3 satisfies: t3≤0.5mm. In this way, the bridge core of the magnetic bridge structure is prevented from being too thick and causing serious magnetic leakage.

[0047] like Figure 2 As shown, the groove wall surface of the groove structure 411 is a first arc surface with a curvature radius of r1. The surface of the arc-shaped shoe portion 412 facing the second rotor structure 30 and the surface of the connecting portion facing the second rotor structure 30 are smoothly transitioned to form an arc transition surface. The arc contour of the arc transition surface is arranged parallel to the magnetic lines of force passing through it. The curvature radius of the arc transition surface is r2, and r1 and r2 satisfy: r2 = 5 × r1. This ensures that as many magnetic lines of force as possible can smoothly pass through the magnetic bridge structure, thereby minimizing magnetic leakage.

[0048] like Figure 2 As shown, each modulation unit 41 has a first side and a second side disposed opposite each other. The angle formed by the first and second sides of each modulation unit 41 is a1. The angle formed between the first side of one modulation unit 41 and the first side of the other modulation unit 41 of two adjacent modulation units 41 is a2. In addition, a1 and a2 satisfy the following relationship: 0.4≤a1 / a2≤0.5, and r1 and a1 satisfy the following relationship: 0.2≤r1 / a1≤0.3. This prevents the modulation units 41 from being too densely packed together and failing to guide the magnetic lines of force.

[0049] Example 2

[0050] It should be noted that, in this embodiment, the difference from the first embodiment is that Figure 3 As shown, the connecting portion is made of a non-magnetic material. The thickness of the arcuate shoe 412 at the end away from the connecting portion is t4, and the thickness from the outer peripheral surface of the modulation unit 41 to the bottom of the arcuate shoe 412 is t5. T4 and t5 satisfy the following relationship: 0.25 ≤ t4 / t5 ≤ 0.3. This helps minimize magnetic leakage caused by the presence of the magnetic bridge structure, thereby ensuring the maximum output torque of the magnetic gear assembly.

[0051] It should be noted that in this embodiment, in order to facilitate the connection of each modulation unit 41 to form a magnetic tuning ring structure, each modulation unit 41 is connected through a connecting part made of non-magnetic material, which is convenient for subsequent stacking and forming, and also facilitates the installation of the magnetic tuning ring structure.

[0052] like Figure 3 As shown, the surface of the arcuate shoe portion 412 is a second arcuate surface with a curvature radius of r3, and the groove wall surface of the groove structure 411 is a third arcuate surface with a curvature radius of r4, and r3 and r4 satisfy: r3 = 4 × r4. This ensures that the arcuate shoe portion 412 can guide the magnetic lines of force as much as possible, thereby ensuring that the magnetic lines of force can pass smoothly through the arcuate shoe portion 412.

[0053] like Figure 3 As shown, each modulation unit 41 has a first side and a second side disposed opposite each other. The angle formed by the first and second sides of each modulation unit 41 is a3, and the angle formed between the shoe tips of the two arcuate shoe portions 412 of each modulation unit 41 is a4. In addition, a3 and a4 satisfy the following relationship: 0.5≤a3 / a4≤0.6, and r4 and a3 satisfy the following relationship: 0.2≤r4 / a3≤0.3. This ensures that magnetic lines of force can smoothly pass through the arcuate shoe portions 412, thereby minimizing magnetic leakage and improving the output torque of the magnetic gear assembly.

[0054] It should be noted that in the present application, each modulation unit 41 has a first side and a second side that are relatively arranged, wherein the first side and the second side can be specified in the counterclockwise direction of the magnetic tuning ring structure, or in the clockwise direction of the magnetic tuning ring structure.

[0055] like Figure 4 As shown in the figure, the output torque of the magnetic gear assembly changes with t1 / t2. Figure 4It can be seen that when t1 / t2=0.2, the output torque of the magnetic gear assembly reaches a peak value of about 51Nm; when t1 / t2<0.2, the output torque of the magnetic gear assembly increases with the increase of the t1 / t2 ratio; when t1 / t2>0.2, the output torque of the magnetic gear assembly decreases with the increase of the t1 / t2 ratio.

[0056] like Figure 5 As shown in the figure, the output torque of the magnetic gear assembly changes with a1 / a2. Figure 5 It can be seen that when a1 / a2<0.4, the output torque of the magnetic gear assembly increases with the increase of the ratio of a1 / a2; when 0.4≤a1 / a2≤0.6, the curve of the output torque of the magnetic gear assembly changing with the change of a1 / a2 is basically flat; when a1 / a2>0.6, the output torque of the magnetic gear assembly decreases with the increase of the ratio of a1 / a2.

[0057] like Figure 6 As shown in Figure 2, the eddy current loss of the magnetic gear assembly changes with r1 / a1. Figure 6 It can be seen that when r1 / a1=6, the eddy current loss of the magnetic gear assembly is the lowest; when r1 / a1<6, the eddy current loss of the magnetic gear assembly decreases with the increase of the ratio of r1 / a1; when r1 / a1>6, the eddy current loss of the magnetic gear assembly tends to increase with the increase of the ratio of r1 / a1.

[0058] like Figure 7 As shown in the figure, the output torque of the magnetic gear assembly changes with r1 / a1. Figure 7 It can be seen that when r1 / a1≤0.3, the output torque of the magnetic gear assembly tends to decrease gently with the increase of the ratio of r1 / a1; when r1 / a1>0.3, the output torque of the magnetic gear assembly tends to decrease rapidly with the increase of the ratio of r1 / a1, and the slope of the latter is greater than that of the former.

[0059] like Figure 8 As shown in FIG, the output torque comparison diagram of the magnetic bridge structure of embodiment 1 and the existing magnetic bridge structure. Figure 8 It can be seen that the magnetic bridge connection method provided by the present application can ensure that the magnetic gear assembly outputs a greater output torque than the magnetic gear assembly with the existing magnetic bridge connection method.

[0060] like Figure 9 As shown, the distribution of magnetic lines of force of the magnetic gear assembly in the magnetic adjustment ring structure of Example 1. Figure 9 In the figure, A represents magnetic lines of force.

[0061] like Figure 10 As shown in Figure 2, the radial magnetic density harmonic distribution comparison at the inner air gap.

[0062] like Figure 11 The output torque comparison diagram of the magnetic tuning ring structure of embodiment 1 and the existing magnetic tuning ring structure is shown in FIG. The magnetic tuning ring structure provided by the present application can ensure that the magnetic gear assembly outputs a greater output torque than the magnetic gear assembly of the existing magnetic tuning ring structure.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0064] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0067] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0068] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A magnetic tuning ring structure, characterized in that: include: A plurality of modulation units (41), two adjacent modulation units (41) are connected via a connecting portion to form the magnetic modulation ring structure, the magnetic modulation ring structure is arranged in an annular gap (100) surrounded by the first rotor structure (10) and the second rotor structure (30), and the connecting portion is made of a magnetic conductive material; A groove structure (411) is formed on one side of the modulation unit (41) facing the first rotor structure (10), arc-shaped boots (412) are formed on both sides of the groove structure (411), and an arc-shaped contour line of an edge of the arc-shaped boot (412) facing the second rotor structure (30) is parallel to a magnetic field line passing through the inside thereof, the first rotor structure (10) is sleeved on the outer peripheral side of the rotating shaft structure (20), and the second rotor structure (30) is sleeved on the outer peripheral side of the first rotor structure (10); Each of the modulation units (41) has a first side and a second side that are arranged opposite to each other, the groove wall surface of the groove structure (411) is a first arc surface, the curvature radius of the first arc surface is r1, the angle formed by the first side and the second side of each modulation unit (41) is a1, the angle formed between the first side of one of the two adjacent modulation units (41) and the first side of the other modulation unit (41) is a2, and a1 and a2 satisfy: 0.4≤a1 / a2≤0.5, and r1 and a1 satisfy: 0.2≤r1 / a1≤0.

3.

2. The magnetic tuning ring structure according to claim 1, characterized in that: The arc-shaped boot portion (412) on a first side of one of the two adjacent modulation units (41) is connected to the connecting portion, and the arc-shaped boot portion (412) on a second side of the other of the two adjacent modulation units (41) is connected to the connecting portion.

3. The magnetic tuning ring structure according to claim 2, characterized in that: The two adjacent arc-shaped boots (412) connected to the same connecting portion and the connecting portion form a magnetic bridge structure, one end of the arc-shaped boot (412) away from the connecting portion forms a bridge head of the magnetic bridge structure, and the connecting portion forms a bridge core of the magnetic bridge structure.

4. The magnetic tuning ring structure according to claim 3, characterized in that: The thickness of the bridge head of the magnetic bridge structure is t1, the thickness from the outer peripheral surface of the modulation unit (41) to the sole of the arc-shaped boot portion (412) is t2, and t1 and t2 satisfy: 0.25≤t1 / t2≤0.

3.

5. The magnetic tuning ring structure according to claim 3, characterized in that: The thickness of the bridge core of the magnetic bridge structure is t3, and t3 satisfies: t3≤0.5mm.

6. The magnetic tuning ring structure according to claim 3, characterized in that: The surface of the arc-shaped boot portion (412) facing the second rotor structure (30) and the surface of the connecting portion facing the second rotor structure (30) are arranged in a smooth transition to form an arc transition surface, and the arc contour line of the arc transition surface is arranged parallel to the magnetic lines of force passing through the interior thereof, the curvature radius of the arc transition surface is r2, and r1 and r2 satisfy: r2=5×r1.

7. The magnetic tuning ring structure according to claim 3, characterized in that: The connecting portion and the modulation unit (41) are integrally formed.

8. A magnetic tuning ring structure, characterized in that: include: A plurality of modulation units (41), two adjacent modulation units (41) are connected via a connecting portion to form the magnetic modulation ring structure, the magnetic modulation ring structure is arranged in an annular gap (100) surrounded by the first rotor structure (10) and the second rotor structure (30), and the connecting portion is made of a non-magnetic material; A groove structure (411) is formed on one side of the modulation unit (41) facing the first rotor structure (10), arc-shaped boots (412) are formed on both sides of the groove structure (411), and an arc-shaped contour line of an edge of the arc-shaped boot (412) facing the second rotor structure (30) is parallel to a magnetic field line passing through the inside thereof, the first rotor structure (10) is sleeved on the outer peripheral side of the rotating shaft structure (20), and the second rotor structure (30) is sleeved on the outer peripheral side of the first rotor structure (10); The shoe surface of the arc-shaped shoe portion (412) is a second arc surface, the curvature radius of the second arc surface is r3, the groove wall surface of the groove structure (411) is a third arc surface, the curvature radius of the third arc surface is r4, each of the modulation units (41) has a first side and a second side arranged opposite to each other, the angle formed by the first side and the second side of each modulation unit (41) is a3, the angle formed between the shoe heads of the two arc-shaped shoe portions (412) of each modulation unit (41) is a4, and the a3 and the a4 satisfy: 0.5≤a3 / a4≤0.6, and the r4 and the a3 satisfy: 0.2≤r4 / a3≤0.3, and the r3 and the r4 satisfy: r3=4×r4.

9. The magnetic tuning ring structure according to claim 8, characterized in that: The thickness of the arc-shaped boot portion (412) at one end away from the connecting portion is t4, the thickness from the outer peripheral surface of the modulation unit (41) to the sole of the arc-shaped boot portion (412) is t5, and t4 and t5 satisfy: 0.25≤t4 / t5≤0.

3.

10. A magnetic gear assembly, characterized in that: include: A first rotor structure (10), wherein a first magnetic element (11) is provided on an outer peripheral surface of the first rotor structure (10); a second rotor structure (30), wherein a second magnetic element (31) is provided on an inner circumferential surface of the second rotor structure (30); A magnetic tuning ring structure (40), wherein the magnetic tuning ring structure (40) is arranged in an annular gap (100) surrounded by the first magnetic element (11) and the second magnetic element (31), and the magnetic tuning ring structure (40) is the magnetic tuning ring structure according to any one of claims 1 to 9.

11. The magnetic gear assembly according to claim 10, wherein: The rotational speed of the first rotor structure (10) is greater than the rotational speed of the magnetic tuning ring structure (40), and the rotational speed of the second rotor structure (30) is zero.

12. The magnetic gear assembly according to claim 10, wherein: The magnetic tuning ring structure (40) and the first magnetic element (11) are arranged with a gap, and the magnetic tuning ring structure (40) and the second magnetic element (31) are arranged with a gap.

13. The magnetic gear assembly according to claim 10, wherein: There are a plurality of first magnetic elements (11), and the plurality of first magnetic elements (11) are arranged at intervals along the circumference of the first rotor structure (10); and / or there are a plurality of second magnetic elements (31), and the plurality of second magnetic elements (31) are arranged at intervals along the circumference of the second rotor structure (30).

14. A composite motor comprising a magnetic gear assembly, characterized in that: The magnetic gear assembly is the magnetic gear assembly according to any one of claims 10 to 13.

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