CN214045392U - Magnetic ring adjusting structure, magnetic gear assembly and composite motor - Google Patents

Abstract

The utility model provides a transfer magnetic ring structure, magnetic gear subassembly and compound motor, wherein, transfer the magnetic ring structure and include a plurality of modulation units, connect through connecting portion between two adjacent modulation units in order to form and transfer the magnetic ring structure, transfer the magnetic ring structure and set up in the annular clearance that first rotor structure and second rotor structure enclose; wherein, the modulation unit is formed with groove structure towards one side of first rotor structure, and the both sides of groove structure form arc boots respectively. The utility model provides an iron core on the accent magnetic ring among the prior art be the quasi-rectangular structure, and the magnetic field modulation effect of the accent magnetic ring of quasi-rectangular structure is limited, and the magnetic leakage between the iron core is serious, has reduced the output torque's of magnetic gear subassembly problem.

Description

Magnetic ring adjusting structure, magnetic gear assembly and composite motor

Technical Field

The utility model relates to a non-contact transmission equipment technical field particularly, relates to a transfer magnetic ring structure, magnetic gear subassembly and compound motor.

Background

The magnetic gear component generally comprises an inner rotor, a magnetic adjusting ring and an outer rotor, wherein permanent magnets are arranged on the outer peripheral surface of the inner rotor and the inner peripheral surface of the outer rotor, the magnetic adjusting ring is assembled by a plurality of iron cores at equal intervals to form an annular structure, however, the iron cores on the existing magnetic adjusting ring are of a similar rectangular structure, the magnetic field modulation effect of the magnetic adjusting ring of the similar rectangular structure is limited, the magnetic leakage among the iron cores is serious, and the output torque magnetic adjusting ring of the magnetic gear component is reduced; in addition, in the process of processing and manufacturing the magnetic adjusting ring, a magnetic bridge for connecting two adjacent similar rectangular iron cores needs to be added, and the magnetic leakage degree of the magnetic bridge is serious due to unreasonable structure of the magnetic bridge, so that the output torque of the magnetic gear assembly is further reduced.

SUMMERY OF THE UTILITY MODEL

A primary object of the utility model is to provide a transfer magnetic ring structure, magnetic gear subassembly and compound motor to solve the iron core of transferring among the prior art on the magnetic ring and be type of rectangle structure, and type of rectangle structure transfer the magnetic field modulation effect of magnetic ring limited, and the magnetic leakage between the iron core is serious, has reduced the problem of the output torque of magnetic gear subassembly.

In order to achieve the above object, according to an aspect of the present invention, there is provided a magnetic flux regulating ring structure, including a plurality of modulation units, two adjacent modulation units are connected by a connection portion to form a magnetic flux regulating ring structure, and the magnetic flux regulating ring structure is disposed in an annular gap enclosed by a first rotor structure and a second rotor structure; wherein, the modulation unit is formed with groove structure towards one side of first rotor structure, and the both sides of groove structure form arc boots respectively.

Further, adjacent arcuate shoes are connected by a connecting portion.

Further, connecting portion are made by magnetic materials, and two adjacent arc boots portion and connecting portion form the magnetic bridge structure, and the one end of keeping away from connecting portion of arc boots portion forms the bridgehead of magnetic bridge structure, and connecting portion form the axle center of magnetic bridge structure.

Further, the bridge head of the magnetic bridge structure has a thickness t1, the thickness from the outer circumferential surface of the modulation unit to the boot sole of the arc-shaped boot is t2, and t1 and t2 satisfy: t1/t2 is more than or equal to 0.25 and less than or equal to 0.3.

Further, the thickness of the bridge core of the magnetic bridge structure is t3, and t3 satisfies: t3 is less than or equal to 0.5 mm.

Further, the groove wall face of the groove structure is a first arc face, the curvature radius of the first arc face is r1, the surface of the arc shoe portion facing one side of the second rotor structure and the surface of the connecting portion facing one side of the second rotor structure are smoothly transited to form an arc transition face, the arc contour line of the arc transition face is arranged in parallel with the magnetic line of force passing through the arc transition face, the curvature radius of the arc transition face is r2, and r1 and r2 satisfy: r2 is 5 × r 1.

Further, each modulation unit has a first side and a second side which are oppositely arranged, the first side and the second side of each modulation unit form an included angle a1, the included 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. ltoreq. a1/a 2. ltoreq.0.5, and r1 and a1 satisfy: r1/a1 is more than or equal to 0.2 and less than or equal to 0.3.

Further, the connecting portion is made of a non-magnetic conductive material, a thickness of an end of the arc-shaped shoe portion, which is away from the connecting portion, is t4, a thickness of an outer circumferential surface of the modulating unit to a sole of the arc-shaped shoe portion is t5, and t4 and t5 satisfy: t4/t5 is more than or equal to 0.25 and less than or equal to 0.3.

Further, the vamp of the arc-shaped boot part 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 is 4 × r 4.

Further, each of the modulating units has a first side and a second side which are oppositely arranged, the first side and the second side of each modulating unit form an included angle a3, the included angle formed between the toe heads of the two arc-shaped boots parts of each modulating unit is a4, and a3 and a4 satisfy: 0.5 is not less than a3/a4 is not less than 0.6, and r4 and a3 satisfy: r4/a3 is more than or equal to 0.2 and less than or equal to 0.3.

Further, the connecting portion is integrally formed with the brewing unit.

According to another aspect of the present invention, there is provided a magnetic gear assembly, comprising a first rotor structure, a second rotor structure and a magnetic ring adjusting structure, wherein the first rotor structure is sleeved on an outer peripheral side of the rotating shaft structure, and a first magnetic element is disposed on an outer peripheral surface of the first rotor structure; the second rotor structure is sleeved on the outer peripheral side of the first rotor structure, and a second magnetic element is arranged on the inner peripheral surface of the second rotor structure; the magnetic adjustment ring structure is arranged in an annular gap surrounded by the first magnetic element and the second magnetic element, and is the magnetic adjustment ring structure.

Further, the rotating speed of the first rotor structure is greater than that of the magnetic adjustment ring structure, and the rotating speed of the second rotor structure is zero.

Further, the magnetic adjustment ring structure and the first magnetic element are arranged with a gap, and the magnetic adjustment ring structure and the second magnetic element are arranged with a gap.

Further, the first magnetic elements are plural and the plural first magnetic elements are arranged at intervals in the circumferential direction of the first rotor structure, and/or the second magnetic elements are plural and the plural second magnetic elements are arranged at intervals in the circumferential direction of the second rotor structure.

According to another aspect of the present invention, there is provided a hybrid motor, including a magnet gear assembly, the magnet gear assembly being the above-mentioned magnet gear assembly.

By applying the technical scheme of the utility model, the structure of the modulation unit is improved, so that the modulation unit is provided with the groove structure and the two arc-shaped boots, and the groove structure can effectively reduce the variation amplitude of the magnetic density harmonic wave between the modulation units in the running process of the magnetic gear component, thereby reducing the eddy current loss as much as possible; in addition, because the arc-shaped contour line of the edge of the arc-shaped boot part is parallel to the magnetic lines of force passing through the inside of the arc-shaped boot part, the magnetic lines of force can pass through the arc-shaped boot part smoothly as much as possible, and the magnetic leakage between two adjacent modulation units is effectively reduced, so that the output torque of the magnetic gear component is greatly improved.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic view of a magnetic gear assembly according to an alternative embodiment of the present invention mounted to a rotating shaft structure;

FIG. 2 is a schematic view of the magnetic tuning ring structure of the magnet gear assembly of FIG. 1, wherein the coupling portion is integrally formed with the modulation unit;

FIG. 3 is a schematic view of the flux regulating ring structure of the magnet gear assembly of FIG. 1, with the attachment portion made of a non-magnetically conductive material omitted;

FIG. 4 illustrates the output torque of the magnetic gear assembly of FIG. 1 as a function of t1/t 2;

FIG. 5 illustrates the output torque of the magnetic gear assembly of FIG. 1 as a function of a1/a 2;

FIG. 6 illustrates the eddy current loss versus r1/a1 for the magnetic gear assembly of FIG. 1;

FIG. 7 illustrates the output torque of the magnetic gear assembly of FIG. 1 as a function of r1/a 1;

fig. 8 shows a graph comparing the output torque of a magnetic bridge structure according to an alternative embodiment of the present invention with an existing magnetic bridge structure;

fig. 9 illustrates the distribution of magnetic lines of force in the flux modulating ring structure of the magnet gear assembly according to an alternative embodiment of the present invention;

FIG. 10 shows a comparison of radial flux density harmonic distributions at the inner air gap;

FIG. 11 shows a tangential flux density harmonic distribution comparison at the inner air gap;

fig. 12 shows a comparison of output torque of a magnetic tuning ring structure according to an alternative embodiment of the present invention with an existing magnetic tuning ring structure.

Wherein the figures include the following reference numerals:

10. a first rotor structure; 11. a first magnetic element; 20. a rotating shaft structure; 30. a second rotor structure; 31. a second magnetic element; 40. a magnetic regulating ring structure; 41. a modulation unit; 411. a groove structure; 412. an arcuate boot portion; 100. an annular gap.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In order to solve the iron core of transferring on the magnetic ring among the prior art and be type rectangle structure, and the magnetic field modulation effect of transferring the magnetic ring of type rectangle structure is limited, and the magnetic leakage between the iron core is serious, has reduced the problem of magnetic gear assembly's output torque, the utility model provides a transfer magnetic ring structure, magnetic gear assembly and compound motor, wherein, compound motor includes the magnetic gear assembly, and the magnetic gear assembly is above-mentioned and following magnetic gear assembly.

As shown in fig. 1, the magnetic gear assembly includes a first rotor structure 10, a second rotor structure 30 and a magnetic ring adjusting structure 40, the first rotor structure 10 is sleeved on the outer periphery of the rotating shaft structure 20, and a first magnetic element 11 is disposed on the outer periphery of the first rotor structure 10; the second rotor structure 30 is sleeved on the outer peripheral side of the first rotor structure 10, and a second magnetic element 31 is arranged on the inner peripheral surface of the second rotor structure 30; the magnetic flux regulating ring structure 40 is disposed in the annular gap 100 surrounded by the first magnetic element 11 and the second magnetic element 31, and the magnetic flux regulating ring structure 40 is the magnetic flux regulating ring structure described above and below.

In the present application, the rotation speed of the first rotor structure 10 is greater than that of the magnetic flux regulating ring structure 40, and the rotation speed of the second rotor structure 30 is zero.

In the present application, the magnetic flux adjusting ring structure 40 is provided with a gap from the first magnetic element 11, and the magnetic flux adjusting ring structure 40 is provided with a gap from the second magnetic element 31. In this way, it is ensured that the magnet gear assembly can achieve a contactless torque transmission.

As shown in fig. 1, the first magnetic elements 11 are plural, and the plural first magnetic elements 11 are arranged at intervals in the circumferential direction of the first rotor structure 10, and/or the second magnetic elements 31 are plural, and the plural second magnetic elements 31 are arranged at intervals in the circumferential direction of the second rotor structure 30.

Example one

As shown in fig. 2, the magnetic flux regulating ring structure includes a plurality of modulation units 41, two adjacent modulation units 41 are connected by a connecting portion to form a magnetic flux regulating ring structure, and the magnetic flux regulating ring structure is disposed in an annular gap 100 enclosed by the first rotor structure 10 and the second rotor structure 30; wherein, one side of the modulation unit 41 facing the first rotor structure 10 is formed with a groove structure 411, and two sides of the groove structure 411 are respectively formed with an arc-shaped boot portion 412.

By improving the structure of the modulation unit 41, so that the modulation unit 41 has the groove structure 411 and the two arc-shaped boots 412, the groove structure 411 can effectively reduce the variation amplitude of the magnetic density harmonic between the modulation units 41 during the operation of the magnetic gear component, thereby reducing the eddy current loss as much as possible; in addition, since the arc-shaped contour line of the edge of the arc-shaped boot part 412 is parallel to the magnetic lines passing through the inside of the arc-shaped boot part, the magnetic lines can pass through as many as possible smoothly, and the magnetic leakage between two adjacent modulation units 41 is effectively reduced, so that the output torque of the magnetic gear component is greatly improved.

In the present embodiment, in order to reduce the difficulty in processing and manufacturing the magnetic flux regulating ring structure, the adjacent arc-shaped shoes 412 may be connected by a connecting portion. Further, the connecting portion is integrally formed with the modulation unit 41. Thus, the laminating forming of the subsequent magnetic adjusting ring structure is ensured.

As shown in fig. 2, the connecting portion is made of a magnetic conductive material, two adjacent arc-shaped boots 412 and the connecting portion form a magnetic bridge structure, one end of each arc-shaped boot 412 far 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. The bridge head of the magnetic bridge structure has a thickness t1, the thickness from the outer circumferential surface of the modulation unit 41 to the boot sole of the arc-shaped boot portion 412 is t2, and t1 and t2 satisfy: t1/t2 is more than or equal to 0.25 and less than or equal to 0.3. In this way, by optimizing the ratio of the thickness of the bridgehead to t1 and the thickness of the outer peripheral surface of the modulation unit 41 to the thickness of the boot sole of the arc-shaped boot portion 412 to t2, it is avoided that the magnetic flux is not guided well because the ratio of the thickness of the bridgehead to t1 and the thickness of the outer peripheral surface of the modulation unit 41 to the thickness of the boot sole of the arc-shaped boot portion 412 is too small, and it is also avoided that the magnetic flux leakage phenomenon occurs because the ratio of the thickness of the bridgehead to t1 and the thickness of the outer peripheral surface of the modulation unit 41 to the thickness of the boot sole of the arc-shaped boot portion 412 is too large.

As shown in fig. 2, the thickness of the bridge core of the magnetic bridge structure is t3, and t3 satisfies: t3 is less than or equal to 0.5 mm. Therefore, the phenomenon of serious magnetic flux leakage caused by over-thick bridge core of the magnetic bridge structure is avoided.

As shown in fig. 2, the groove wall surface of the groove structure 411 is a first arc surface, the radius of curvature of the first arc surface is r1, the surface of the arc shoe portion 412 facing the side of the second rotor structure 30 and the surface of the connecting portion facing the side of the second rotor structure 30 are smoothly transited to form an arc transition surface, the arc contour line of the arc transition surface is arranged in parallel with the magnetic line of force passing through the inside of the arc transition surface, the radius of curvature of the arc transition surface is r2, and r1 and r2 satisfy: r2 is 5 × r 1. In this way, it is ensured that as many magnetic lines as possible can pass smoothly through the magnetic bridge structure, thereby minimizing magnetic leakage.

As shown in fig. 2, each modulation unit 41 has a first side and a second side which are oppositely arranged, the first side and the second side of each modulation unit 41 form an included angle a1, the included angle formed between the first side of one modulation unit 41 and the first side of the other modulation unit 41 in two adjacent modulation units 41 is a2, and a1 and a2 satisfy: 0.4. ltoreq. a1/a 2. ltoreq.0.5, and r1 and a1 satisfy: r1/a1 is more than or equal to 0.2 and less than or equal to 0.3. In this way, it is avoided that the modulation units 41 are too dense to guide the magnetic field lines.

Example two

It should be noted that, in the present embodiment, as shown in fig. 3, the difference from the first embodiment is that the connecting portion is made of a non-magnetic conductive material, the thickness of the end of the arc-shaped shoe portion 412 away from the connecting portion is t4, the thickness from the outer circumferential surface of the modulation unit 41 to the sole of the arc-shaped shoe portion 412 is t5, and t4 and t5 satisfy: t4/t5 is more than or equal to 0.25 and less than or equal to 0.3. Thus, the magnetic flux leakage caused by the existence of the magnetic bridge structure is favorably reduced as much as possible, and the output torque of the magnetic gear assembly is ensured to be as large as possible.

It should be noted that, in the present embodiment, in order to facilitate the connection of the modulation units 41 to form the magnetic ring structure, the modulation units 41 are connected by the connection portion made of the non-magnetic conductive material, which facilitates the subsequent lamination and the installation of the magnetic ring structure.

As shown in fig. 3, the shoe surface of the arcuate shoe portion 412 is a second arcuate surface having a radius of curvature r3, the groove wall surface of the groove structure 411 is a third arcuate surface having a radius of curvature r4, and r3 and r4 satisfy: r3 is 4 × r 4. 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 smoothly pass through the arcuate shoe portion 412.

As shown in FIG. 3, each of the modulating units 41 has a first side and a second side disposed opposite to each other, the first side and the second side of each modulating unit 41 form an included angle a3, the toe heads of the two arc-shaped boots 412 of each modulating unit 41 form an included angle a4, and a3 and a4 satisfy: 0.5 is not less than a3/a4 is not less than 0.6, and r4 and a3 satisfy: r4/a3 is more than or equal to 0.2 and less than or equal to 0.3. Thus, it is ensured that the magnetic lines of force can smoothly pass through the arc-shaped shoe portion 412, thereby reducing the leakage flux as much as possible and further improving the output torque of the magnet gear assembly.

In the present application, each of the modulation units 41 has a first side and a second side that are disposed opposite to each other, and the first side and the second side may be defined in a counterclockwise direction of the flux modulating ring structure or may be defined in a clockwise direction of the flux modulating ring structure.

As shown in FIG. 4, the output torque of the magnet gear assembly varies with t1/t 2. As can be seen from fig. 4, when t1/t2 is 0.2, the output torque of the magnet and gear assembly reaches a peak value of about 51 Nm; when t1/t2<0.2, the output torque of the magnet gear assembly increases with increasing t1/t2 ratio; when t1/t2>0.2, the output torque of the magnet gear assembly decreases as the t1/t2 ratio increases.

As shown in FIG. 5, the output torque of the magnet gear assembly is plotted as a function of a1/a 2. As can be seen from FIG. 5, when a1/a2<0.4, the output torque of the magnet gear assembly increases with increasing ratio of a1/a 2; when the a1/a2 is more than or equal to 0.4 and less than or equal to 0.6, the output torque of the magnetic gear assembly is basically in a gentle state along with the change curve of a1/a 2; when a1/a2>0.6, the output torque of the magnet gear assembly decreases as the ratio of a1/a2 increases.

As shown in FIG. 6, the eddy current loss of the magnet gear assembly is plotted as a function of r1/a 1. As can be seen from fig. 6, when r1/a1 is 6, the eddy current loss of the magnet gear assembly is the lowest; when r1/a1<6, the eddy current loss of the magnet gear assembly decreases with increasing r1/a1 ratio; when r1/a1>6, the eddy current loss of the magnet gear assembly tends to increase with increasing r1/a1 ratio.

As shown in FIG. 7, the output torque of the magnet gear assembly is plotted as a function of r1/a 1. As can be seen from FIG. 7, when r1/a1 is less than or equal to 0.3, the output torque of the magnetic gear assembly has a gently decreasing trend along with the increase of the ratio of r1/a 1; when r1/a1>0.3, the output torque of the magnet gear assembly tends to decrease rapidly with increasing r1/a1 ratio, with the slope of the latter being greater than the former.

As shown in fig. 8, a graph comparing the output torque of the magnetic bridge structure of the first embodiment with that of the conventional magnetic bridge structure. As can be seen from fig. 8, the magnetic bridge connection method provided in the present application can ensure that the magnetic gear assembly outputs a larger output torque than the magnetic gear assembly of the conventional magnetic bridge connection method.

As shown in fig. 9, the distribution of the magnetic lines of force in the magnetic flux adjusting ring structure of the magnetic gear assembly of the first embodiment is shown. In fig. 9, a represents magnetic lines.

As shown in fig. 10, the radial magnetic flux density harmonics at the inner air gap are contrasted.

As shown in fig. 11, the tangential flux density harmonic distributions at the inner air gap are compared.

As shown in fig. 12, the output torque of the magnetic tuning ring structure of the first embodiment is compared with the output torque of the conventional magnetic tuning ring structure. The application provides a transfer magnetic ring structure can ensure that the magnetic gear subassembly output is than the magnetic gear subassembly bigger output torque of current transfer magnetic ring structure.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (16)

1. A flux ring structure, comprising:

a plurality of modulation units (41), wherein two adjacent modulation units (41) are connected through a connecting part to form a magnetic flux regulating ring structure, and the magnetic flux regulating ring structure is arranged in an annular gap (100) enclosed by the first rotor structure (10) and the second rotor structure (30);

one side of the modulation unit (41) facing the first rotor structure (10) is provided with a groove structure (411), two sides of the groove structure (411) are respectively provided with an arc-shaped boot part (412), and an arc-shaped contour line of the edge of the arc-shaped boot part (412) facing the second rotor structure (30) is parallel to a magnetic line of force passing through the interior of the arc-shaped boot part.

2. The magnetic tuning ring structure according to claim 1, wherein each of the modulation units (41) has a first side and a second side which are oppositely disposed, the arcuate shoe portion (412) of the first side of one of the adjacent two modulation units (41) is connected to the connecting portion, and the arcuate shoe portion (412) of the second side of the other of the adjacent two modulation units (41) is connected to the connecting portion.

3. The magnetic tuning ring structure according to claim 2, wherein the connecting portion is made of a magnetic conductive material, and two adjacent arc-shaped shoes (412) and the connecting portion connected to the same connecting portion form a magnetic bridge structure, wherein an end of the arc-shaped shoe (412) far away from the connecting portion forms a bridge head of the magnetic bridge structure, and the connecting portion forms a bridge center of the magnetic bridge structure.

4. The magnetic tuning ring structure of claim 3, wherein the bridge head of the magnetic bridge structure has a thickness t1, the outer circumferential surface of the modulation unit (41) has a thickness t2 to the sole of the arc-shaped shoe portion (412), and the t1 and the t2 satisfy: t1/t2 is more than or equal to 0.25 and less than or equal to 0.3.

5. The magnetic tuning ring structure of claim 3, wherein the thickness of the bridge center of the magnetic bridge structure is t3, and the t3 satisfies: t3 is less than or equal to 0.5 mm.

6. The magnetic tuning ring structure according to claim 3, wherein the groove wall surface of the groove structure (411) is a first arc surface, the radius of curvature of the first arc surface is r1, the surface of the arc shoe portion (412) facing the second rotor structure (30) and the surface of the connecting portion facing the second rotor structure (30) are smoothly transited to form an arc transition surface, the arc contour of the arc transition surface is parallel to the magnetic lines of force passing through the inner portion of the arc transition surface, the radius of curvature of the arc transition surface is r2, and r1 and r2 satisfy: r2 is 5 × r 1.

7. The magnetic tuning ring structure of claim 6, wherein the first side and the second side of each modulation unit (41) form an included angle a1, the included angle formed between the first side of one modulation unit (41) and the first side of the other modulation unit (41) in two adjacent modulation units (41) is a2, and the a1 and the a2 satisfy: 0.4. ltoreq. a1/a 2. ltoreq.0.5, and the r1 and the a1 satisfy: r1/a1 is more than or equal to 0.2 and less than or equal to 0.3.

8. The magnetic tuning ring structure according to claim 1, wherein the connecting portion is made of a non-magnetic conductive material, the thickness of the end of the arc-shaped shoe portion (412) far from the connecting portion is t4, the thickness of the outer circumferential surface of the modulation unit (41) to the shoe bottom of the arc-shaped shoe portion (412) is t5, and the t4 and the t5 satisfy: t4/t5 is more than or equal to 0.25 and less than or equal to 0.3.

9. The magnetic tuning ring structure of claim 8, wherein the shoe surface of the arc-shaped shoe part (412) is a second circular arc surface, the radius of curvature of the second circular arc surface is r3, the groove wall surface of the groove structure (411) is a third circular arc surface, the radius of curvature of the third circular arc surface is r4, and r3 and r4 satisfy: r3 is 4 × r 4.

10. The magnetic tuning ring structure of claim 9, wherein each modulation unit (41) has a first side and a second side which are oppositely arranged, the first side and the second side of each modulation unit (41) form an included angle a3, the included angle formed between the shoe heads of the two arc-shaped shoes (412) of each modulation unit (41) is a4, and the a3 and the a4 satisfy: 0.5. ltoreq. a3/a 4. ltoreq.0.6, and the r4 and the a3 satisfy: r4/a3 is more than or equal to 0.2 and less than or equal to 0.3.

11. The magnetic tuning ring structure according to claim 3, wherein the connecting portion is integrally formed with the modulation unit (41).

12. A magnetic gear assembly, comprising:

the first rotor structure (10), the first rotor structure (10) is sleeved on the outer peripheral side of the rotating shaft structure (20), and a first magnetic element (11) is arranged on the outer peripheral surface of the first rotor structure (10);

a second rotor structure (30), wherein the second rotor structure (30) is sleeved on the outer peripheral side of the first rotor structure (10), and a second magnetic element (31) is arranged on the inner peripheral surface of the second rotor structure (30);

a magnetic flux regulating ring structure (40), wherein the magnetic flux regulating ring structure (40) is arranged in an annular gap (100) enclosed by the first magnetic element (11) and the second magnetic element (31), and the magnetic flux regulating ring structure (40) is the magnetic flux regulating ring structure of any one of claims 1 to 11.

13. A magnetic gear assembly according to claim 12, characterized in that the rotational speed of the first rotor structure (10) is greater than the rotational speed of the flux ring structure (40), and the rotational speed of the second rotor structure (30) is zero.

14. A magnetic gear assembly according to claim 12, characterized in that the magnetic ring adjusting structure (40) is arranged with a gap to the first magnetic element (11) and the magnetic ring adjusting structure (40) is arranged with a gap to the second magnetic element (31).

15. A magnetic gear assembly according to claim 12, wherein the first magnetic element (11) is plural, a plurality of the first magnetic elements (11) being spaced circumferentially of the first rotor structure (10), and/or a plurality of the second magnetic elements (31) being spaced circumferentially of the second rotor structure (30).

16. A compound electric motor comprising a magnet gear assembly, wherein the magnet gear assembly is as claimed in any one of claims 12 to 15.

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