Magnetic adjustment ring, magnetic adjustment ring assembly, magnetic gear, composite motor

Abstract

The present invention provides a magnetic modulation ring, a magnetic modulation ring assembly, a magnetic gear, and a compound motor. The magnetic modulation ring includes an annular yoke portion and a plurality of magnetic modulation protrusions on the outer peripheral side wall of the annular yoke portion. The plurality of magnetic modulation protrusions extend radially from the inside to the outside of the annular yoke portion, and the free ends of the magnetic modulation protrusions have a plurality of teeth facing the outer rotor side. The plurality of teeth are arranged at intervals in the circumferential direction of the annular yoke portion. According to the magnetic modulation ring, the magnetic modulation ring assembly, the magnetic gear, and the compound motor of the present invention, by providing a plurality of teeth at the free ends of the magnetic modulation protrusions, the content of high-order harmonics at the outer air gap during operation is effectively reduced, thereby reducing the output torque fluctuation.

Description

Technical Field

[0001] The present invention belongs to the technical field of magnetic gears, and particularly relates to a magnetic modulation ring, a magnetic modulation ring assembly, a magnetic gear, and a compound motor. Background Art

[0002] Compared with the magnetic gear of the traditional structure, the magnetic field modulation type magnetic gear can make all permanent magnets play a role in torque transmission, has a relatively high torque density and very high efficiency, and has good application prospects. The existing magnetic field modulation type magnetic gear in the solution is composed of structures such as an inner rotor, inner rotor permanent magnets, a magnetic modulation ring, an outer rotor, and outer rotor permanent magnets. And the magnitude of torque fluctuation directly affects the working performance of the magnetic gear. In the prior art, there is a lack of refinement of the structure of the magnetic modulation ring facing the outer rotor side. For example, in the prior art, the side of the magnetic modulation ring facing the outer rotor is mostly a smooth arc surface. This smooth arc surface structure makes the content of high-order harmonics at the outer air gap relatively large during the operation of the magnetic modulation ring, resulting in a relatively large output torque fluctuation. In order to reduce the torque fluctuation, the present invention is proposed. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a magnetic modulation ring, a magnetic modulation ring assembly, a magnetic gear, and a compound motor to overcome the deficiency that the output torque fluctuation of the magnetic gear is relatively large due to the smooth arc surface structure on the side of the magnetic modulation ring facing the outer rotor in the prior art.

[0004] To solve the above problems, the present invention provides a magnetic modulation ring, including an annular yoke portion and a plurality of magnetic modulation protrusions on the outer peripheral side wall of the annular yoke portion. The plurality of magnetic modulation protrusions extend radially from the inside to the outside of the annular yoke portion. The free end of the magnetic modulation protrusion has a plurality of teeth on the side facing the outer rotor, and the plurality of teeth are arranged at intervals in the circumferential direction of the annular yoke portion.

[0005] Preferably, in the circumferential direction of the annular yoke portion, the two side surfaces of the magnetic modulation protrusion protrude from the outer side surface of the outermost tooth among the plurality of teeth.

[0006] Preferably, in the circumferential direction of the annular yoke portion, the width of any one tooth is w1, and the width of the tooth groove formed between any two adjacent teeth is w2, and w1 / w2 = 2.5 - 3.

[0007] Preferably, the number of teeth on a single magnetic modulation protrusion is N1, and the number of pole pairs of the outer rotor is Pout. When Pout is an even number, N1 = Pout / 4; when Pout is an odd number, N1 = Pout / 3, and Pout≥16.

[0008] The present invention further provides a magnetic modulation ring assembly, which includes a magnetic modulation ring and a support ring body capable of supporting the magnetic modulation ring. The support ring body has a plurality of support bars spaced circumferentially along the support ring body, and an installation groove is formed between any two adjacent support bars. The magnetic modulation ring is the above-mentioned magnetic modulation ring, and a plurality of the magnetic modulation protrusions are respectively installed in a one-to-one correspondence in a plurality of the installation grooves.

[0009] Preferably, the support bars are made of high-temperature superconducting materials.

[0010] Preferably, in the circumferential direction of the annular yoke portion, the width of the magnetic modulation protrusion is a1, the support bar includes a support body, the width of the support body is a2, and a1 / a2 = 0.7 to 0.8.

[0011] Preferably, the support bar further includes an end support body on the side of the support body facing the outer rotor. In the radial direction of the annular yoke portion, the thickness of the tooth is d1, and the thickness of the support bar is d2, and d1 / d2 = 0.2 to 0.25.

[0012] Preferably, the end support body extends along the circumferential direction of the annular yoke portion to both sides and matches the outer side surfaces of the two outermost teeth in the circumferential direction on two adjacent magnetic modulation protrusions.

[0013] Preferably, the magnetic modulation ring assembly further includes a first end cover body, which is integrally formed with the support ring body and is located at one axial end of the support ring body.

[0014] Preferably, a plurality of connection holes are formed at the other axial end of the support ring body away from the first end cover body.

[0015] Preferably, the aperture of the connection hole is b, and b < d2 / 2.5.

[0016] The present invention further provides a magnetic gear, which includes an inner rotor, an outer rotor, and a magnetic modulation ring assembly in an air gap formed between the inner rotor and the outer rotor. The magnetic modulation ring assembly is the above-mentioned magnetic modulation ring assembly.

[0017] The present invention further provides a composite motor, which includes a magnetic gear, and the magnetic gear is the above-mentioned magnetic gear.

[0018] For a magnetic modulation ring, a magnetic modulation ring assembly, a magnetic gear, and a composite motor provided by the present invention, by providing a plurality of teeth on the side surface of the free end of the magnetic modulation protrusion facing the outer rotor, the content of high-order harmonics at the outer air gap (i.e., the circumferentially extending gap between the free end and the outer rotor) during the operation of the magnetic gear can be effectively reduced, thereby effectively reducing torque ripple. Description of the Drawings

[0019] Figure 1 Schematic cross-sectional structure diagram of the magnetic flux regulating ring according to an embodiment of the present invention;

[0020] Figure 2 is Figure 1 local enlarged view at A in

[0021] Figure 3 Schematic structure diagram of the magnetic flux regulating ring assembly according to another embodiment of the present invention;

[0022] Figure 4 is Figure 3 local enlarged view at B in

[0023] Figure 5 is Figure 3 three-dimensional structure diagram of

[0024] Figure 6 Schematic structure diagram of the magnetic gear according to still another embodiment of the present invention;

[0025] Figure 7 is Figure 6 cross-sectional structure diagram of

[0026] Figure 8 Curve diagram of torque fluctuation varying with w1 / w2;

[0027] Figure 9 Curve diagram of torque varying with a1 / a2;

[0028] Figure 10 Curve diagram of torque varying with d1 / d2;

[0029] Figure 11 Curve diagram of torque fluctuation varying with d1 / d2;

[0030] Figure 12 Comparison diagram of the output torque of the technical solution of the present invention (i.e., this solution) and the output torque of the prior art using the potting solution;

[0031] Figure 13 Comparison diagram of the output torque harmonics of the technical solution of the present invention (i.e., this solution) and the output torque harmonics of the prior art using the potting solution.

[0032] The reference numerals are represented as:

[0033] 1. Magnetic modulation ring; 11. Annular yoke; 12. Magnetic modulation protrusion; 13. Tooth; 2. Support ring body; 21. Support bar; 211. Support main body; 212. End support body; 22. Second end cover body; 221. First shaft hole; 23. Connection hole; 100. Inner rotor; 101. Inner permanent magnet; 102. Inner iron core; 200. Outer rotor; 201. Outer permanent magnet; 202. Outer iron core; 300. Magnetic modulation ring assembly; 400. First bearing; 500. Second bearing; 600. First end cover body; 601. Power output rotating shaft; 700. Power input rotating shaft. Detailed implementation manners

[0034] Refer to Figures 1 to 13 As shown in the figure, according to an embodiment of the present invention, a magnetic modulation ring is provided, including an annular yoke 11 and a plurality of magnetic modulation protrusions 12 on the outer peripheral side wall of the annular yoke 11. The plurality of magnetic modulation protrusions 12 extend radially from the inside to the outside along the annular yoke 11. The free end of the magnetic modulation protrusion 12 has a plurality of teeth 13 on the side facing the outer rotor 200, and the plurality of teeth 13 are arranged at intervals along the circumferential direction of the annular yoke 11. In this technical solution, by arranging a plurality of the teeth 13 on the side of the free end of the magnetic modulation protrusion 12 facing the outer rotor 200, the content of high-order harmonics at the outer air gap (i.e., the circumferentially extending gap between the free end and the outer rotor 200) during the operation of the magnetic gear can be effectively reduced, thereby effectively reducing the torque ripple.

[0035] For the convenience of description, as shown in the attached Figure 1 figure, in any cross-section perpendicular to the axial direction of the magnetic modulation ring, in the circumferential direction of the annular yoke 11, the two side surfaces of the magnetic modulation protrusion 12 protrude from the outer side surface of the outermost tooth 13 among the plurality of teeth 13. That is, the outermost two teeth 13 among the plurality of teeth 13 are concave into the side surface of the magnetic modulation protrusion 12, which can ensure the function of the plurality of teeth 13 in eliminating high-order harmonics. When the outer side surface of the outermost tooth 13 of the outermost two teeth 13 among the plurality of teeth 13 is flush with the side surface of the magnetic modulation protrusion 12, the outermost two teeth 13 will not be able to play their role in eliminating high-order harmonics. That is, when the outermost two teeth 13 are concave into the side surface of the magnetic modulation protrusion 12, assuming there are a total of eight teeth, the number of teeth that can eliminate high-order harmonics at this time is eight. Similarly, if the outer side surface of the outermost tooth 13 of the outermost two teeth 13 among the plurality of teeth 13 is flush with the side surface of the magnetic modulation protrusion 12, the number of teeth that can eliminate high-order harmonics at this time is six.

[0036] In order to further reduce the adverse effect of the structure of the magnetic modulation ring on torque ripple, preferably, in the circumferential direction of the annular yoke portion 11, the width of any one of the teeth 13 is w1, and the width of the tooth groove formed between any two adjacent teeth 13 is w2, where w1 / w2 = 2.5 to 3. Through simulation verification (as Figure 8 shown), when w1 / w2 = 2.5 to 3, the torque ripple is relatively optimal.

[0037] Regarding the number of teeth 13 provided, in order to eliminate high-order harmonics to the greatest extent, preferably, the number of teeth 13 on a single magnetic modulation protrusion 12 is N1, and the number of pole pairs of the outer rotor 200 is Pout. When Pout is an even number, N1 = Pout / 4; when Pout is an odd number, N1 = Pout / 3, and Pout ≥ 16.

[0038] The present invention also provides a magnetic modulation ring assembly, which includes a magnetic modulation ring 1 and a support ring body 2 capable of supporting the magnetic modulation ring 1. The support ring body 2 has a plurality of support bars 21 arranged at intervals in the circumferential direction of the support ring body 2. An installation groove is formed between any two adjacent support bars 21. The magnetic modulation ring 1 is the above-mentioned magnetic modulation ring, and a plurality of magnetic modulation protrusions 12 are respectively installed in a one-to-one correspondence in a plurality of the installation grooves. In the prior art, since the process of supporting the magnetic modulation ring by means of potting is an alternating curing process, during the potting process, it is extremely easy to cause the displacement or mechanical deformation of a plurality of magnetic modulation protrusions 12 or even the magnetic modulation ring, resulting in a large torque ripple. However, in the technical solution of the present invention, the support ring body 2 is used to replace the potting support solution in the prior art, eliminating the adverse effects of the potting process.

[0039] In addition, the methods generally adopted in the prior art for torque optimization are usually to modify the structural parameters of each component, such as modifying the thickness of the inner rotor permanent magnet, the thickness of the outer rotor permanent magnet, the shape of the magnetic modulation ring iron core, etc. However, the torque increase that these optimization methods can bring is often very limited, generally less than 10%. The permanent magnets currently used in magnetic field modulation type magnetic gears are rare earth permanent magnets, which have a very high magnetic energy product, but the current solutions have a low utilization rate of the magnetic force of the permanent magnets, resulting in a waste of a large amount of magnetic force. Based on this deficiency in the prior art, preferably, the support bar 21 is made of a high-temperature superconducting material, such as yttrium-based (YBCO), bismuth-based (BSCCO), magnesium diboride (MgB 2 ) and other materials existing in the prior art. Its relative magnetic permeability at room temperature can reach a few tenths, which can very effectively block the leakage magnetic field between the magnetic modulation ring iron cores, enabling the magnetic force lines of the inner and outer permanent magnets to be well gathered in the iron core of the magnetic modulation ring, thereby greatly increasing the magnetic force that the magnetic modulation ring can modulate, improving the overall utilization rate of the magnetic force of the permanent magnets by the magnetic gear, and greatly increasing the output torque of the magnetic gear.Figure 12 and Figure 13 respectively show the comparison of the output torque and the output torque harmonic after adopting this technical solution with the effect of the potting solution in the prior art. It can be clearly seen from the figure that after adopting the technical solution of this application, its output torque is increased from 50 Nm in the prior art to 80 Nm, and the torque improvement effect is significant, and the torque fluctuation is also smoother.

[0040] To further optimize and improve the torque of the magnetic gear, preferably, in the circumferential direction of the annular yoke portion 11, the width of the magnetic modulation protrusion 12 is a1, the support bar 21 includes a support body 211, and the width of the support body 211 is a2, a1 / a2 = 0.7 - 0.8. After simulation verification (as Figure 9 shown), when a1 / a2 = 0.7 - 0.8, the torque is near the maximum value and the output torque is optimal. Further, the support bar 21 further includes an end support body 212 on the side of the support body 211 facing the outer rotor 200. In the radial direction of the annular yoke portion 11, the thickness of the tooth 13 is d1, and the thickness of the support bar 21 is d2, d1 / d2 = 0.2 - 0.25. After simulation verification (as Figure 10 and Figure 11 shown), when d1 / d2 = 0.2 - 0.25, the torque is near the maximum value and the output torque is optimal, and at the same time, it can ensure that the output torque fluctuation is within the minimum range.

[0041] Preferably, the end support body 212 extends along the circumferential direction of the annular yoke portion 11 to both sides and matches the outer sides of the two outermost teeth 13 in the circumferential direction on the adjacent two magnetic modulation protrusions 12. The end support body 212 in this technical solution can provide a radially inward support force towards the annular yoke portion 11 for the magnetic modulation protrusion 12, and this support force is opposite to the centrifugal force of the magnetic modulation protrusion 12 during operation, thereby effectively preventing the deformation of the magnetic modulation protrusion 12 caused by the centrifugal force, and further ensuring the uniformity of the outer air gap, and further reducing the torque fluctuation.

[0042] To further improve the mechanical strength of the support ring body 2 and thus improve its anti-deformation ability, preferably, the support ring body 2 can be integrally formed with the end cover body of the magnetic gear, such as the output end cover body or the output end cover body. As a specific implementation manner, as Figure 5 shown, the magnetic modulation ring assembly further includes a first end cover body 600, and the first end cover body 600 is integrally formed with the support ring body 2 and is at one axial end of the support ring body 2. It can be understood that the Figure 5As shown, the first end cover 600 is the output end cover of the magnetic gear. On the side of the first end cover 600 away from the second bearing 500, a power output rotating shaft 601 is constructed. The power output rotating shaft 601 and the first end cover 600 are integrally formed by casting or machining, effectively ensuring the coaxiality of the output shaft. That is, the first end cover 600 is preferably the output end cover rather than the input end cover. This can effectively avoid the situation where when the input end cover is the first end cover, the output end cover has to be connected to the support ring body 2 by screws. Then, the torque transmitted from the support ring body 2 will be transmitted to the output end cover and the output shaft through the screws. Such a structure is relatively unstable and is prone to problems such as distortion, deformation, and fracture when the load is increased. Therefore, it is preferred to make the first end cover 600 and the support ring body 2 into one body to ensure the structural strength.

[0043] Preferably, a plurality of connection holes 23 are constructed on the other axial end of the support ring body 2 away from the first end cover 600 and are fixed to the first end cover 600 by screws. While the installation is more convenient, the support for the magnetic modulation ring is also well guaranteed. Preferably, the aperture diameter (nominal diameter of the internal thread) of the connection hole 23 is b, and b < d2 / 2.5 to ensure the structural strength and magnetic isolation effect of the support bar 21.

[0044] It can be understood that except for the side facing the outer rotor 200, the support bar 21 is in contact with the magnetic modulation ring 2 on all other sides to ensure its support effect. And the side of the support bar 21 facing the outer rotor 200 is preferably designed as a plane to simplify the manufacturing process of the support bar 21.

[0045] The present invention also provides a magnetic gear, which includes an inner rotor 100, an outer rotor 200, and a magnetic modulation ring assembly 300 disposed in the air gap formed between the inner rotor 100 and the outer rotor 200. The magnetic modulation ring assembly 300 is the above-mentioned magnetic modulation ring assembly. Specifically, the inner rotor 100 includes an inner iron core 102 and a plurality of inner permanent magnets 101 surface-mounted on the outer peripheral wall of the inner iron core 102. The outer rotor 200 includes an outer iron core 202 and a plurality of outer permanent magnets 201 assembled on the inner peripheral wall of the outer iron core 202. It can be understood that the number of pole pairs Pin of the inner permanent magnets 101, the number of pole pairs Pout of the outer permanent magnets 201, and the number Pt of magnetic modulation protrusions 12 in the magnetic modulation ring assembly should satisfy Pt = Pin + Pout to achieve the magnetic modulation function of the magnetic modulation protrusions 12. The inner iron core 102 includes an inner rotor yoke, inner rotor bumps, and an input shaft hole, which is laminated by soft magnetic materials. The number of inner rotor bumps is equal to the number of poles 2Pin of the inner permanent magnets, which serves to fix the inner permanent magnets. The inner permanent magnets 101 are made of rare earth or ferrite permanent magnet materials. The inner permanent magnets 101 are surface-mounted on the outer surface of the inner iron core 102, and all are radially magnetized with the magnetization directions of adjacent two permanent magnets being opposite. The outer iron core 202 includes an outer rotor yoke and outer rotor bumps, which are laminated by soft magnetic materials. The number of outer rotor bumps is equal to the number of poles 2Pout of the outer permanent magnets, which serves to fix the outer permanent magnets. The outer permanent magnets are made of rare earth or ferrite permanent magnet materials. The outer permanent magnets are surface-mounted on the inner surface of the outer rotor iron core, and all are radially magnetized with the magnetization directions of adjacent two permanent magnets being opposite. The magnetic modulation protrusions 12 are laminated by soft magnetic materials.

[0046] The inner rotor 100 is sleeved on a power input rotating shaft 700. The power input rotating shaft 700 is respectively mounted on the second end cover body 22 (which has a bearing chamber) and the first end cover body 600 (which has a bearing chamber) through a first bearing 400 and a second bearing 500. At the same time, one end of the power input rotating shaft 700 corresponding to the second end cover body 22 is inserted into a first shaft hole 221 and extends out to be drivingly connected with an external power component.

[0047] The first end cover body 600 and the second end cover body 22 are bolted together. Specifically, through holes are also provided at positions of the second end cover body 22 corresponding to the connection holes 23, and the two are connected by screws. The connection holes 23 are specifically blind holes with internal threads, and the screws used are made of high-strength non-magnetic materials such as austenitic stainless steel.

[0048] According to an embodiment of the present invention, a composite motor is also provided, which includes a magnetic gear, and the magnetic gear is the above-mentioned magnetic gear.

[0049] It is easily understood by those skilled in the art that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0050] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and variations can still be made, and these improvements and variations should also be regarded as within the protection scope of the present invention.

Claims

1. A magnetic tuning ring, characterized in that, it includes an annular yoke portion (11) and a plurality of magnetic tuning protrusions (12) on the outer peripheral side wall of the annular yoke portion (11). The plurality of magnetic tuning protrusions (12) extend radially from the inside to the outside of the annular yoke portion (11). The free end of the magnetic tuning protrusion (12) has a plurality of teeth (13) facing the outer rotor (200) side. The plurality of teeth (13) are arranged at intervals in the circumferential direction of the annular yoke portion (11); in the circumferential direction of the annular yoke portion (11), the width of any one of the teeth (13) is w1, and the width of the tooth groove formed between any two adjacent teeth (13) is w2, and w1 / w2 = 2.5 to 3.

2. The magnetic tuning ring according to claim 1, characterized in that, in the circumferential direction of the annular yoke portion (11), the two side surfaces of the magnetic tuning protrusion (12) protrude from the outer side surface of the outermost tooth (13) among the plurality of teeth (13).

3. The magnetic tuning ring according to claim 1, characterized in that, the number of the teeth (13) on a single magnetic tuning protrusion (12) is N1, and the number of pole pairs of the outer rotor (200) is Pout. When Pout is an even number, N1 = Pout / 4; when Pout is an odd number, N1 = Pout / 3, and Pout≥16.

4. A magnetic tuning ring assembly, characterized in that, it includes a magnetic tuning ring (1) and a support ring body (2) capable of supporting the magnetic tuning ring (1). The support ring body (2) has a plurality of support bars (21) arranged at intervals in the circumferential direction of the support ring body (2). An installation groove is formed between any two adjacent support bars (21). The magnetic tuning ring (1) is the magnetic tuning ring according to any one of claims 1 to 3, and the plurality of magnetic tuning protrusions (12) are respectively installed in the plurality of installation grooves in a one-to-one correspondence.

5. The magnetic tuning ring assembly according to claim 4, characterized in that, the support bar (21) is made of a high-temperature superconducting material.

6. The magnetic tuning ring assembly according to claim 4, characterized in that, in the circumferential direction of the annular yoke portion (11), the width of the magnetic tuning protrusion (12) is a1, the support bar (21) includes a support main body (211), and the width of the support main body (211) is a2, and a1 / a2 = 0.7 to 0.

8.

7. The magnetic tuning ring assembly according to claim 6, characterized in that, the support bar (21) further includes an end support body (212) on the side of the support main body (211) facing the outer rotor (200). In the radial direction of the annular yoke portion (11), the thickness of the tooth (13) is d1, and the thickness of the support bar (21) is d2, and d1 / d2 = 0.2 to 0.

25.

8. The magnetic tuning ring assembly according to claim 7, characterized in that, the end support body (212) extends along the circumferential direction of the annular yoke portion (11) to both sides and matches the outer side surfaces of the two outermost teeth (13) in the circumferential direction on the adjacent two magnetic tuning protrusions (12).

9. The magnetic tuning ring assembly according to claim 7, It is characterized in that it further includes a first end cover body (600), the first end cover body (600) is integrally formed with the support ring body (2), and is located at one axial end of the support ring body (2).

10. The magnetic flux regulating ring assembly according to claim 9 It is characterized in that a plurality of connection holes (23) are formed on the other axial end of the support ring body (2) away from the first end cover body (600).

11. The magnetic flux regulating ring assembly according to claim 10 It is characterized in that the aperture of the connection hole (23) is b, and b < d2 / 2.5 12. A magnetic gear includes an inner rotor (100), an outer rotor (200), and a magnetic flux regulating ring assembly (300) in the air gap formed between the inner rotor (100) and the outer rotor (200). It is characterized in that the magnetic flux regulating ring assembly (300) is the magnetic flux regulating ring assembly according to any one of claims 4 to 11 13. A composite motor includes a magnetic gear It is characterized in that the magnetic gear is the magnetic gear according to claim 12

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