Coaxial magnetic gear

Abstract

The application provides a coaxial magnetic gear, comprising: an inner rotor assembly; an outer rotor assembly sleeved on the outer periphery of the inner rotor assembly, the axis of the outer rotor assembly coincides with that of the inner rotor assembly; a modulation ring arranged in an annular cavity between the inner rotor assembly and the outer rotor assembly; the modulation ring comprises a plurality of modulation teeth arranged along the circumference of the inner rotor assembly; the modulation tooth comprises a plurality of modulation tooth cores and at least one support, the plurality of modulation tooth cores and the at least one support are stacked along the circumference of the inner rotor assembly as spliced pieces to splice into a sector block, and the two adjacent spliced pieces are tightly fitted without splicing gaps. In the scheme, the modulation teeth are spliced into sector blocks, the sector block is arranged so that the two adjacent spliced pieces can be tightly fitted by being stacked in the circumferential direction, and each spliced piece is an integral structure in the axial direction without splicing gaps. In this way, the problem that the modulation teeth are prone to deformation in the splicing mode of axial stacking in the related art is avoided.

Description

Technical Field

[0001] This invention relates to the field of equipment for transmitting torque in a non-contact manner, and particularly to a coaxial magnetic gear. Background Technology

[0002] Currently, compared with mechanical gears, coaxial magnetic gears have advantages such as low vibration, low noise, and high efficiency due to their non-contact torque transmission, and have broad application prospects in the transmission field. Coaxial magnetic gears generally consist of an outer rotor assembly, an inner rotor assembly, and a modulation ring, where the modulation ring is composed of multiple modulation teeth with good magnetic permeability. This is done to reduce eddy current losses.

[0003] In related technologies, spliced ​​components, such as silicon steel sheet cores, are typically stacked along the axial direction of the inner rotor assembly to form modulation teeth. However, modulation teeth formed in this way are difficult to keep straight in the axial direction and are prone to deformation, thus affecting the performance of the magnetic gear.

[0004] In other words, the modulation teeth in the relevant technology are prone to deformation. Summary of the Invention

[0005] To address the problems in the prior art, this application proposes a coaxial magnetic gear that solves the problem of easy deformation of the modulation teeth.

[0006] The coaxial magnetic gear of the present invention includes: an inner rotor assembly; an outer rotor assembly sleeved on the outer periphery of the inner rotor assembly, the outer rotor assembly and the inner rotor assembly having the same axis; a modulation ring disposed in an annular cavity between the inner rotor assembly and the outer rotor assembly; the modulation ring includes a plurality of modulation teeth spaced apart along the circumference of the inner rotor assembly; the modulation teeth include a plurality of modulation tooth cores and at least one support member, the plurality of modulation tooth cores and at least one support member being stacked as splicing members along the circumference of the inner rotor assembly to splice the modulation teeth into a fan-shaped block.

[0007] In one embodiment, when the modulation tooth includes a plurality of modulation tooth cores and a support member, the outer contour of the support member is configured as a fan-shaped block, the support member has a first mounting surface and a second mounting surface symmetrically disposed to the first mounting surface, wherein a portion of the plurality of modulation tooth cores are stacked on the first mounting surface along the circumference of the support member, and another portion of the modulation tooth cores are stacked on the second mounting surface along the circumference of the support member.

[0008] In one embodiment, when the modulation tooth includes multiple modulation tooth cores and two support members, the two support members are symmetrically arranged with respect to the center plane d of the modulation tooth, the support members have a third mounting surface, the two third mounting surfaces of the two support members are arranged opposite to each other, and the multiple modulation tooth cores are stacked between the two third mounting surfaces along a first direction.

[0009] In one embodiment, when the modulation tooth includes multiple modulation tooth cores and multiple support members, the multiple modulation tooth cores are arranged at circumferential intervals along the inner rotor assembly and are distributed in a fan shape, and the multiple support members are arranged one-to-one between two adjacent modulation tooth cores of the multiple modulation tooth cores.

[0010] In one embodiment, when the modulation tooth includes multiple modulation tooth cores and multiple support members, one end of the multiple modulation tooth cores is adjacent to each other, and they are distributed in a fan shape along the circumference of the inner rotor assembly. The multiple support members are arranged one-to-one between two adjacent modulation tooth cores in the multiple modulation tooth cores.

[0011] In one embodiment, the support is made of a soft magnetic composite material.

[0012] In one embodiment, the support is made of a soft magnetic composite material or a non-magnetic material.

[0013] In one embodiment, the modulated tooth core is made of silicon steel sheet core.

[0014] In one embodiment, the inner rotor assembly includes an inner rotor core and a plurality of inner rotor permanent magnets, which are arranged at circumferential intervals on the outer peripheral wall of the inner rotor core.

[0015] In one embodiment, the outer rotor assembly includes an outer rotor core and a plurality of outer rotor permanent magnets, the plurality of outer rotor permanent magnets being arranged at circumferential intervals on the inner wall surface of the outer rotor core.

[0016] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0017] The coaxial magnetic gear provided by this invention has at least the following advantages compared with the prior art:

[0018] Multiple modulation tooth cores and at least one support member serve as splicing components, stacked circumferentially along the inner rotor assembly to form sector-shaped blocks. This sector-shaped arrangement ensures a tight fit between adjacent splicing components in the circumferential direction, while maintaining a unified axial structure without gaps. This avoids the deformation problem of modulation teeth caused by axial stacking in related technologies. This ensures the modulation performance of the modulation ring, and consequently, the working performance of the coaxial magnetic gear. Attached Figure Description

[0019] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0020] Figure 1 This shows a schematic diagram of the coaxial magnetic gear in Embodiment 1 of the present invention;

[0021] Figure 2 This shows a schematic diagram of the modulation teeth in Embodiment 1 of the present invention;

[0022] Figure 3 A schematic diagram of the modulation teeth in Embodiment 2 of the present invention is shown;

[0023] Figure 4 A schematic diagram of the modulation teeth in Embodiment 3 of the present invention is shown;

[0024] Figure 5 A schematic diagram of the modulation teeth in Embodiment 4 of the present invention is shown;

[0025] Figure 6 Showing Figure 5 A magnified view of the middle modulation teeth;

[0026] Figure 7 This shows a calibration diagram of the positions of the modulation rings P1, P2, and P3 of the coaxial magnetic gear in Embodiment 1 of the present invention;

[0027] Figure 8 The diagram shows the magnetic flux density curves at positions P1, P2, and P3 of the modulation ring in Embodiment 1 of the present invention.

[0028] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0029] Figure label:

[0030] 10. Outer rotor assembly; 11. Outer rotor core; 12. Outer rotor permanent magnet; 20. Inner rotor assembly; 21. Inner rotor core; 22. Inner rotor permanent magnet; 30. Modulation ring; 31. Modulation tooth; 312. Modulation tooth core; 313. Support component; 3131. First mounting surface; 3132. Second mounting surface; 3133. Third mounting surface. Detailed Implementation

[0031] The invention will now be further described with reference to the accompanying drawings.

[0032] This invention provides a coaxial magnetic gear, comprising an inner rotor assembly 20, an outer rotor assembly 10, and a modulation ring 30. The outer rotor assembly 10 is sleeved on the outer periphery of the inner rotor assembly 20, and the axes of the outer rotor assembly 10 and the inner rotor assembly 20 coincide. The modulation ring 30 is disposed within an annular cavity between the inner rotor assembly 20 and the outer rotor assembly 10, and includes a plurality of modulation teeth 31 spaced apart circumferentially along the inner rotor assembly 20. Each modulation tooth 31 includes a plurality of modulation tooth cores 312 and at least one support member 313. The plurality of modulation tooth cores 312 and at least one support member 313 are stacked as splicing members circumferentially along the inner rotor assembly 20 to splice the modulation teeth 31 into a fan-shaped block. Adjacent splicing members fit tightly together without any splicing gaps.

[0033] In the above configuration, multiple modulation tooth cores 312 and at least one support member 313 serve as splicing components, stacked circumferentially along the inner rotor assembly to splice the modulation teeth 31 into fan-shaped blocks. This fan-shaped block configuration ensures that adjacent splicing components can fit tightly together circumferentially, and each splicing component is an integral structure in the axial direction, eliminating splicing gaps. This avoids the problem of modulation tooth deformation caused by axial stacking splicing methods in related technologies. This ensures the modulation performance of the modulation ring 30, and consequently, the working performance of the coaxial magnetic gear.

[0034] It should be noted that the modulation ring 30 in this application has a modulation function. The modulation principle of the modulation ring 30 is as follows: the modulation ring 30, composed of multiple modulation teeth 31, modulates the inner rotor permanent magnet 22 and the outer rotor permanent magnet 12 respectively, thereby generating multiple pairs of magnetic field harmonics with the same number of pole pairs and the same rotation speed in the air gap. These harmonics interact to generate a stable electromagnetic torque, thereby enabling the magnetic gear to transmit torque.

[0035] It should be noted that this application does not restrict the overlapping method of the spliced ​​parts; they can be glued together or directly pressed together.

[0036] Example 1

[0037] like Figure 1 and Figure 2 As shown, the present invention provides a coaxial magnetic gear, which includes a plurality of modulating tooth cores 312 and a support member 313. The outer contour of the support member 313 is set as a fan-shaped block. The support member 313 has a first mounting surface 3131 and a second mounting surface 3132 symmetrically arranged with respect to the first mounting surface 3131 (symmetrical about the center bisecting the surface of the support member 313). Half of the modulating tooth cores 312 are stacked on the first mounting surface 3131 along the circumference of the support member 313, and the other half of the modulating tooth cores 312 are stacked on the second mounting surface 3132 along the circumference of the support member 313.

[0038] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the support 313 is made of a soft magnetic composite material.

[0039] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the modulation tooth core 312 is made of silicon steel sheet core.

[0040] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the inner rotor assembly 20 includes an inner rotor core 21 and a plurality of inner rotor permanent magnets 22, which are arranged at circumferential intervals on the outer peripheral wall of the inner rotor core 21.

[0041] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the inner rotor assembly 20 includes an inner rotor core 21 and ten inner rotor permanent magnets 22, which are arranged at circumferential intervals on the outer peripheral wall of the inner rotor core 21.

[0042] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the outer rotor assembly 10 includes an outer rotor core 11 and a plurality of outer rotor permanent magnets 12, which are arranged at circumferential intervals on the inner wall surface of the outer rotor core 11.

[0043] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the outer rotor assembly 10 includes an outer rotor core 11 and thirty-eight outer rotor permanent magnets 12, which are arranged at circumferential intervals on the inner wall surface of the outer rotor core 11.

[0044] It should be noted that the modulation tooth 31 consists of three parts: a first part, a second part, and a third part. The first and third parts are formed by stacking silicon steel sheets along the circumferential direction, while the second part (support member 313) is sandwiched between the first and third parts and is made of soft magnetic composite material. The modulation tooth 31 constructed in this manner has high structural rigidity, effectively preventing axial deformation, and is simple in structure and easy to manufacture.

[0045] It should be noted that in this embodiment, the silicon steel sheet core and the support member 313 made of soft magnetic composite material are manufactured independently, and their manufacturing and installation methods are simple. Meanwhile, the support member 313 is located between the silicon steel sheet cores, where the magnetic flux density is relatively low (see...). Figure 7 and Figure 8 The magnetic flux density at position P3 of the modulation tooth 31 is the lowest, indicating that the magnetic flux density in the middle part of the modulation tooth 31 is low. Even if the saturation magnetic flux density of the support 313 is low, it will not have a negative impact on the electromagnetic performance of the magnetic gear. At the same time, since the core loss of the support 313 is low, the core loss of the magnetic gear can be reduced, thereby improving the efficiency of the magnetic gear.

[0046] Example 2

[0047] The difference between Example 2 and Example 1 is that:

[0048] like Figure 3 As shown, in one embodiment, when the modulation tooth 31 includes a plurality of modulation tooth cores 312 and two support members 313, the two support members 313 are symmetrically arranged with respect to the center plane d of the modulation tooth 31. The support member 313 has a third mounting surface 3133, which is a vertical surface. The two third mounting surfaces 3133 of the two support members 313 are arranged opposite to each other, and the plurality of modulation tooth cores 312 are stacked between the two third mounting surfaces 3133 along a first direction.

[0049] It should be noted that the modulation tooth 31 consists of three parts: a first part, a second part, and a third part. The first and third parts are an integral structure (support member 313), and the materials used to compose them can be soft magnetic composite materials with high magnetic permeability or magnetically conductive or non-magnetically conductive materials with high structural strength. The second part is composed of multiple silicon steel sheet cores stacked along a first direction, and is sandwiched between the first and third parts. The modulation tooth 31 assembled in this way has high structural rigidity, effectively preventing axial deformation, and is simple in structure and easy to manufacture.

[0050] Of course, depending on the actual situation, the first and third parts can be omitted, meaning the modulation tooth 31 consists only of the second part, which is formed by stacking silicon steel sheets along the first direction. Since the thickness of the silicon steel sheet core remains constant along the radial direction, the two sides of the modulation tooth 31 formed after stacking are parallel to each other in the first direction, and there is no so-called "tight inside, loose outside" phenomenon. The modulation tooth 31 formed in this way has the advantages of simple processing and manufacturing, high structural strength, and this shape of modulation tooth can adjust the magnetic field harmonics inside the magnetic gear, thereby increasing the torque density of the magnetic gear.

[0051] It should be noted that, in this embodiment, since the core loss of the modulation tooth is mainly distributed at both ends of the modulation tooth 31, when the support 313 is made of soft magnetic composite material, the core loss of the modulation tooth 31 can be reduced (the loss of soft magnetic composite material is relatively small), thereby improving the efficiency of the magnetic gear.

[0052] Example 2 is identical to Example 1 in other aspects, and will not be described again here.

[0053] Example 3

[0054] The difference between Example 3 and Example 1 is that:

[0055] like Figure 4 As shown, in one embodiment, the modulation tooth 31 includes a plurality of modulation tooth cores 312 and a plurality of support members 313. The plurality of modulation tooth cores 312 are arranged at intervals along the circumference of the inner rotor assembly 20 and are distributed in a fan shape. The plurality of support members 313 are arranged one-to-one between two adjacent modulation tooth cores 312.

[0056] It should be noted that the thickness of the support member 313 is not uniform along the radial direction, and the thickness gradually decreases from the outside to the inside along the radial direction, while the thickness of the silicon steel sheet core is uniform along the radial direction. This avoids the phenomenon of "tight inside and loose outside" in the modulation teeth 31 during stacking, thus facilitating manufacturing. Since the silicon steel sheet cores of this invention are stacked along the circumferential direction, there are no segments in the axial direction (this direction is perpendicular to the plane formed by the circumferential and radial directions) of a single silicon steel sheet core, effectively avoiding axial deformation of the modulation teeth 31 caused by the stacking process and improving the structural rigidity of the modulation teeth 31.

[0057] It should be noted that in this embodiment, the silicon steel sheet core and the support member 313 made of soft magnetic composite material are arranged alternately, which can avoid the phenomenon of "tight inside and loose outside" when the silicon steel sheet core is stacked in the circumferential direction, improve the structural rigidity of the modulation tooth 31, avoid deformation, and thus improve the electromagnetic performance of the magnetic gear.

[0058] Example 3 is identical to Example 1 in other aspects, and will not be described again here.

[0059] Example 4

[0060] The difference between Example 4 and Example 3 is that:

[0061] like Figure 5 and Figure 6 As shown, in one embodiment, when the modulation tooth 31 includes multiple modulation tooth cores 312 and multiple support members 313, one end of the multiple modulation tooth cores 312 is adjacent (adjacent and in contact, not spaced apart), and they are distributed in a fan shape along the circumference of the inner rotor assembly 20. The multiple support members 313 are arranged one-to-one between two adjacent modulation tooth cores 312 in the multiple modulation tooth cores 312.

[0062] Specifically, such as Figure 5 and Figure 6 As shown, in one embodiment, the support 313 is filled with powdered particles.

[0063] It should be noted that the thickness of the silicon steel core is exactly the same, while the thickness of the support 313 varies along the radial direction, being thinner near the inner diameter and thicker near the outer diameter (the thickness gradually decreases from the outside to the inside along the radial direction). The modulation teeth 31 constructed in this way effectively avoid the phenomenon of "tight inside and loose outside," and by overlapping in the circumferential direction, segmentation of the modulation teeth 31 in the axial direction (which is perpendicular to both the circumferential and radial directions) can be effectively avoided, thereby improving the structural rigidity of the modulation teeth 31 and offering the advantage of simple processing and manufacturing.

[0064] It should be noted that the gap between adjacent silicon steel core sheets is filled with soft magnetic composite material powder. Compared with the structure in Implementation 3, the process is simpler and easier to manufacture. At the same time, the modulation gear 31 is mainly composed of silicon steel core sheets, which has good magnetic permeability and improves the torque density of the magnetic gear.

[0065] Example 4 is identical to Example 3 in other aspects, and will not be described in detail here.

[0066] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limitations on this invention.

[0067] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A coaxial magnetic gear, characterized in that, include: Internal rotor assembly; An outer rotor assembly is sleeved on the outer periphery of the inner rotor assembly, and the outer rotor assembly and the inner rotor assembly have their axes coincident. A modulation ring is disposed within an annular cavity between the inner rotor assembly and the outer rotor assembly; The modulation ring includes a plurality of modulation teeth spaced circumferentially along the inner rotor assembly; The modulation teeth include multiple modulation tooth cores and at least one support member. The multiple modulation tooth cores and the at least one support member serve as splicing members and are stacked along the circumferential direction of the inner rotor assembly to splice the modulation teeth into a fan-shaped block. The modulated tooth core is made of silicon steel sheet core. The thickness of the support member is different along the radial direction, and the thickness gradually decreases from the outside to the inside along the radial direction. The thickness of the silicon steel sheet core is the same along the radial direction. When the modulation tooth includes multiple modulation tooth cores and a support member, the outer contour of the support member is set as a fan-shaped block. The support member has a first mounting surface and a second mounting surface symmetrically arranged with respect to the first mounting surface. Among the multiple modulation tooth cores, a portion of the modulation tooth cores are stacked on the first mounting surface along the circumference of the support member, and another portion of the modulation tooth cores are stacked on the second mounting surface along the circumference of the support member. When the modulation tooth includes multiple modulation tooth cores and two support members, the two support members are symmetrically arranged with respect to the center plane d of the modulation tooth. Each support member has a third mounting surface, which is a vertical surface. The two third mounting surfaces of the two support members are arranged opposite to each other, and the multiple modulation tooth cores are stacked between the two third mounting surfaces along a first direction. The support is filled with powdered particles.

2. The coaxial magnetic gear according to claim 1, characterized in that, When the modulation tooth includes multiple modulation tooth cores and multiple support members, the multiple modulation tooth cores are arranged at circumferential intervals along the inner rotor assembly and are distributed in a fan shape, and the multiple support members are arranged one-to-one between two adjacent modulation tooth cores.

3. The coaxial magnetic gear according to claim 1, characterized in that, When the modulation tooth includes multiple modulation tooth cores and multiple support members, one end of the multiple modulation tooth cores is adjacent to each other, and they are distributed in a fan shape along the circumference of the inner rotor assembly. The multiple support members are arranged one-to-one between two adjacent modulation tooth cores in the multiple modulation tooth cores.

4. The coaxial magnetic gear according to any one of claims 1-3, characterized in that, The support component is made of soft magnetic composite material.

5. The coaxial magnetic gear according to claim 1, characterized in that, The support component is made of soft magnetic composite material or non-magnetic material.

6. The coaxial magnetic gear according to claim 1, characterized in that, The modulated tooth core is made of silicon steel sheet.

7. The coaxial magnetic gear according to claim 1, characterized in that, The inner rotor assembly includes an inner rotor core and a plurality of inner rotor permanent magnets, which are arranged at circumferential intervals on the outer peripheral wall of the inner rotor core.

8. The coaxial magnetic gear according to claim 1, characterized in that, The outer rotor assembly includes an outer rotor core and a plurality of outer rotor permanent magnets, which are arranged circumferentially on the inner wall surface of the outer rotor core.

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