CN112491248B

CN112491248B - Magnetic adjustment ring, magnetic adjustment ring assembly, magnetic gear, composite motor

Info

Publication number: CN112491248B
Application number: CN202011378616.4A
Authority: CN
Inventors: 胡余生; 陈彬; 马晓皓; 李权锋
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2025-05-30
Anticipated expiration: 2040-11-30
Also published as: CN112491248A

Abstract

The present invention provides a magnetic adjustment ring, a magnetic adjustment ring assembly, a magnetic gear, and a composite motor. The magnetic adjustment ring includes an annular yoke and a plurality of magnetic adjustment protrusions on the outer peripheral side wall of the annular yoke, wherein the plurality of magnetic adjustment protrusions extend from the inside to the outside along the radial direction of the annular yoke, and the free end of the magnetic adjustment protrusion has a plurality of teeth facing the outer rotor side, and the plurality of teeth are arranged at intervals along the circumference of the annular yoke. According to a magnetic adjustment ring, a magnetic adjustment ring assembly, a magnetic gear, and a composite motor of the present invention, by arranging a plurality of teeth at the free end of the magnetic adjustment protrusion, the high-order harmonic content at the outer air gap during operation is effectively reduced, thereby reducing the output torque fluctuation.

Description

Magnet adjusting ring, magnet adjusting ring assembly, magnetic gear and compound motor

Technical Field

The invention belongs to the technical field of magnetic gears, and particularly relates to a magnetic adjusting ring, a magnetic adjusting ring assembly, a magnetic gear and a compound motor.

Background

Compared with the magnetic gear with the traditional structure, the magnetic field modulation type magnetic gear can enable all permanent magnets to play a role in torque transmission, has relatively high torque density and high efficiency, and has good application prospect. The magnetic field modulation type magnetic gear of the existing scheme consists of an inner rotor, an inner rotor permanent magnet, a magnetic modulation ring, an outer rotor permanent magnet and other structures. The torque fluctuation directly affects the working performance of the magnetic gear, but in the prior art, the structure of the magnetic ring facing to the outer rotor is not thinned, for example, the magnetic ring facing to the outer rotor in the prior art is a smooth cambered surface, and the smooth cambered surface structure enables the higher harmonic content at the outer air gap to be larger in the operation process of the magnetic ring, so that the output torque fluctuation is larger, and the invention is proposed for reducing the torque fluctuation.

Disclosure of Invention

Therefore, the invention aims to solve the technical problem of providing a magnetic adjusting ring, a magnetic adjusting ring assembly, a magnetic gear and a compound motor, so as to overcome the defect of larger fluctuation of output torque of the magnetic gear caused by a smooth cambered surface structure on one side of the magnetic adjusting ring facing to an outer rotor in the prior art.

In order to solve the above problems, the present invention provides a magnetism adjusting ring, which includes an annular yoke and a plurality of magnetism adjusting protrusions on an outer peripheral side wall of the annular yoke, wherein the magnetism adjusting protrusions extend outwards from inside to outside along a radial direction of the annular yoke, a free end of the magnetism adjusting protrusions faces to one side of an outer rotor, and the plurality of teeth are arranged at intervals along a circumferential direction of the annular yoke.

Preferably, in the circumferential direction of the annular yoke, both side surfaces of the magnetism regulating protrusion protrude from an outer side surface of an outermost tooth of the plurality of teeth.

Preferably, in the circumferential direction of the annular yoke, the width of any one tooth is w1, and the width of a tooth slot formed between any two adjacent teeth is w2, where w1/w2=2.5 to 3.

Preferably, the number of the teeth on the single magnetic regulating protrusion is N1, the pole pair number of the outer rotor is Pout, when Pout is even, N1=Pout/4, and when Pout is odd, N1=Pout/3, and Pout is equal to or greater than 16.

The invention also provides a magnetic adjusting ring assembly which comprises a magnetic adjusting ring and a supporting ring body capable of supporting the magnetic adjusting ring, wherein the supporting ring body is provided with a plurality of supporting bars which are arranged at intervals along the circumferential direction of the supporting ring body, mounting grooves are formed between any two adjacent supporting bars, the magnetic adjusting ring is the magnetic adjusting ring, and a plurality of magnetic adjusting protrusions are respectively and correspondingly arranged in the mounting grooves one by one.

Preferably, the support bar is made of high-temperature superconducting materials.

Preferably, in the circumferential direction of the annular yoke, the width of the magnetism regulating protrusion is a1, the support bar comprises a support main body, and the width of the support main body is a2, a 1/a2=0.7-0.8.

Preferably, the support bar further comprises an end support body located at one side of the support body facing the outer rotor, the thickness of the teeth is d1 in the radial direction of the annular yoke, and the thickness of the support bar is d2, d1/d2=0.2-0.25.

Preferably, the end support body extends to both sides in the circumferential direction of the annular yoke portion, and is matched with the outer side surfaces of the two outermost teeth in the circumferential direction on the adjacent two magnetic regulating protrusions.

Preferably, the magnetic adjusting ring assembly further comprises a first end cover body, wherein the first end cover body and the support ring body are integrally formed and are positioned at one axial end of the support ring body.

Preferably, a plurality of connecting holes are formed on the other axial end of the support ring body, which is far away from the first end cover body.

Preferably, the aperture of the connecting hole is b, and b is smaller than d2/2.5.

The invention also provides a magnetic gear, which comprises an inner rotor, an outer rotor and a magnetic ring adjusting assembly arranged in an air gap formed by the inner rotor and the outer rotor, wherein the magnetic ring adjusting assembly is the magnetic ring adjusting assembly.

The invention also provides a compound motor, which comprises a magnetic gear, wherein the magnetic gear is the magnetic gear.

According to the magnetic adjusting ring, the magnetic adjusting ring assembly, the magnetic gear and the compound motor, the plurality of teeth are arranged on the side face of the free end of the magnetic adjusting protrusion, which faces the outer rotor, so that the higher harmonic content of an outer air gap (namely a circumferentially extending gap between the free end and the outer rotor) of the magnetic gear in the operation process can be effectively reduced, and torque fluctuation is effectively reduced.

Drawings

FIG. 1 is a schematic cross-sectional view of a magnetism adjusting ring according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic structural diagram of a magnetic tuning ring assembly according to another embodiment of the present invention;

FIG. 4 is a partial enlarged view at B in FIG. 3;

FIG. 5 is a schematic perspective view of FIG. 3;

FIG. 6 is a schematic diagram of a magnetic gear according to another embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view of FIG. 6;

FIG. 8 is a graph of torque ripple as a function of w1/w 2;

FIG. 9 is a graph of torque as a1/a 2;

FIG. 10 is a graph of torque as a function of d1/d 2;

FIG. 11 is a graph of torque ripple as a function of d1/d 2;

FIG. 12 is a graph comparing the output torque of the present solution, i.e. the present solution, with the output torque of the prior art solution using glue filling;

fig. 13 is a graph comparing output torque harmonics of the present solution, i.e. the present solution, with output torque harmonics of the prior art solution, i.e. the present solution.

The reference numerals are expressed as:

1. The magnetic adjusting ring comprises a magnetic adjusting ring, 11, an annular yoke part, 12, a magnetic adjusting protrusion, 13, teeth, 2, a supporting ring body, 21, a supporting bar, 211, a supporting main body, 212, an end supporting body, 22, a second end cover body, 221, a first shaft hole, 23, a connecting hole, 100, an inner rotor, 101, an inner permanent magnet, 102, an inner iron core, 200, an outer rotor, 201, an outer permanent magnet, 202, an outer iron core, 300, a magnetic adjusting ring assembly, 400, a first bearing, 500, a second bearing, 600, a first end cover body, 601, a power output rotating shaft, 700 and a power input rotating shaft.

Detailed Description

Referring to fig. 1 to 13 in combination, according to an embodiment of the present invention, there is provided a magnetism adjusting ring including an annular yoke 11 and a plurality of magnetism adjusting protrusions 12 on an outer circumferential side wall of the annular yoke 11, wherein the plurality of magnetism adjusting protrusions 12 extend outwards from inside to outside in a radial direction of the annular yoke 11, a free end of the magnetism adjusting protrusions 12 has a plurality of teeth 13 toward an outer rotor 200 side, and the plurality of teeth 13 are disposed at intervals in a circumferential direction of the annular yoke 11. In this technical solution, by providing a plurality of teeth 13 on the side surface of the free end of the magnetism regulating protrusion 12 facing the outer rotor 200, the harmonic content at the outer air gap (i.e., the circumferentially extending gap between the free end and the outer rotor 200) of the magnetic gear during operation can be effectively reduced, so that torque fluctuation is effectively reduced.

For convenience of description, as shown in fig. 1, on any cross section perpendicular to the axial direction of the magnetism regulating ring, in the circumferential direction of the annular yoke 11, both side surfaces of the magnetism regulating 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 of the plurality of teeth 13 are recessed in the side surface of the magnetism regulating protrusion 12, so that the effect of eliminating the higher harmonic can be ensured, and when the outer side surfaces of the outermost two teeth 13 of the plurality of teeth 13 are flush with the side surface of the magnetism regulating protrusion 12, the outermost two teeth 13 cannot exert the effect of eliminating the higher harmonic, that is, when the outermost two teeth 13 are recessed in the side surface of the magnetism regulating protrusion 12, assuming that eight teeth are present, the number of teeth capable of eliminating the higher harmonic at this time is eight, and similarly, when the outer side surfaces of the outermost two teeth 13 of the plurality of teeth 13 are flush with the side surface of the magnetism regulating protrusion 12, the number of teeth capable of eliminating the higher harmonic at this time is six.

In order to further reduce the adverse effect of the structure of the magnetism adjusting ring on the torque ripple, preferably, in the circumferential direction of the annular yoke 11, the width of any one tooth 13 is w1, the width of a tooth slot formed between any two adjacent teeth 13 is w2, w1/w2=2.5 to 3, and through simulation verification (as shown in fig. 8), when w1/w2=2.5 to 3, the torque ripple is relatively optimal.

In order to eliminate higher harmonics to the greatest extent, the number of teeth 13 on the single magnetic regulating protrusion 12 is preferably N1, the pole pair number of the outer rotor 200 is Pout, where n1=pout/4 when Pout is even, and where n1=pout/3 when Pout is odd, pout is equal to or greater than 16.

The invention also provides a magnetic adjusting ring assembly, which comprises a magnetic adjusting ring 1 and a support ring body 2 capable of supporting the magnetic adjusting ring 1, wherein the support ring body 2 is provided with a plurality of support bars 21 which are arranged at intervals along the circumferential direction of the support ring body 2, and a mounting groove is formed between any two adjacent support bars 21, the magnetic adjusting ring 1 is the magnetic adjusting ring, and a plurality of magnetic adjusting protrusions 12 are respectively and correspondingly arranged in the mounting grooves one by one. In the prior art, the process of supporting the magnetic adjusting rings by adopting the glue filling mode is an alternate curing process, so that the magnetic adjusting protrusions 12 and even the positions of the magnetic adjusting rings are easily changed or mechanically deformed in the glue filling process, the torque fluctuation is larger, and the technical scheme of the invention adopts the supporting ring body 2 to replace the glue filling supporting scheme in the prior art, so that the adverse effect of the glue filling process is eliminated.

In addition, the method for optimizing the torque in the prior art generally modifies the structural parameters of each component, such as the thickness of the inner rotor permanent magnet, the thickness of the outer rotor permanent magnet, the shape of the magnetic regulating ring iron core, etc., but the torque improvement which can be brought by the optimization modes is very limited and is generally below 10%, the permanent magnet adopted by the magnetic field modulation type magnetic gear is a rare earth permanent magnet, which has very high magnetic energy product, the utilization ratio of the magnetic force of the permanent magnet is lower in the current scheme, more magnetic force waste is caused, and based on the defect in the prior art, preferably, the supporting bar 21 is made of a high-temperature superconducting material, such as yttrium system (YBCO), bismuth System (BSCCO), magnesium diboride (MgB ₂) and other materials which exist in the prior art, the relative permeability can reach a zero number, the magnetic force between the magnetic cores of the magnetic regulating ring can be very effectively blocked, the magnetic force lines of the inner permanent magnet and the outer permanent magnet can be well attributed to the magnetic ring of the magnetic regulating ring, so that the magnetic force lines of the inner permanent magnet and the outer permanent magnet can be well concentrated in the magnetic ring, the magnetic force can be modulated, the magnetic force of the magnetic ring can be greatly improved, the magnetic force of the magnetic force can be greatly increased, and the magnetic force output of the magnetic gear can greatly, and the magnetic force can greatly increase the magnetic force efficiency of the magnetic gear, and the magnetic output torque of the magnetic gear, and the magnetic efficiency can be greatly increased. Fig. 12 and 13 show the output torque and the output torque harmonic wave after the technical scheme is adopted compared with the glue filling scheme in the prior art, and it is obvious from the figure that the output torque is improved to 80Nm from 50Nm in the prior art by adopting the technical scheme of the application, the torque lifting effect is obvious, and the torque fluctuation is more gentle.

In order to further optimize the torque of the lifting magnetic gear, preferably, in the circumferential direction of the annular yoke 11, the width of the magnetism regulating protrusion 12 is a1, the supporting bar 21 includes a supporting body 211, the width of the supporting body 211 is a2, a1/a2=0.7-0.8, and as verified by simulation (as shown in fig. 9), 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 212 disposed on a side of the support body 211 facing the outer rotor 200, wherein the thickness of the teeth 13 is d1 in the radial direction of the annular yoke 11, the thickness of the support bar 21 is d2, d1/d2=0.2 to 0.25, and when d 1/d2=0.2 to 0.25, the torque is near the maximum value and the output torque is optimal, and the output torque fluctuation is ensured to be within the minimum range, as verified by simulation (as shown in fig. 10 and 11).

Preferably, the end supporting bodies 212 extend to two sides along the circumferential direction of the annular yoke 11 and are matched with the outer side surfaces of the two outermost teeth 13 on the adjacent two magnetic regulating protrusions 12, and in the technical scheme, the end supporting bodies 212 can provide a supporting force facing to the radial direction of the annular yoke 11 for the magnetic regulating protrusions 12, and the supporting force is opposite to the centrifugal force of the magnetic regulating protrusions 12 during operation, so that the deformation of the magnetic regulating protrusions 12 caused by the centrifugal force is effectively prevented, the uniformity of the outer air gap can be ensured, and further the torque fluctuation can be further reduced.

In order to further increase the mechanical strength of the support ring 2 and thus its resistance to deformation, it is preferred that the support ring 2 can be integrated with an end cap of a magnetic gear, such as an output end cap or an output end cap. As a specific embodiment, as shown in fig. 5, the magnetic ring adjusting assembly further includes a first end cover 600, where the first end cover 600 is integrally formed with the support ring body 2 and is located at one axial end of the support ring body 2, it can be understood that, in fig. 5, the first end cover 600 is shown as an output end cover body of a magnetic gear, one side of the first end cover body 600 away from the second bearing 500 is configured with a power output rotating shaft 601, the power output rotating shaft 601 and the first end cover body 600 are integrally formed by casting or machining, so that coaxiality of an output shaft is effectively ensured, that is, the first end cover body 600 is preferably an output end cover body rather than an input end cover body, which can effectively avoid that when the input end cover body is the first end cover body, the output end cover body is connected with the support ring body 2 through a screw, so that a moment transmitted from the support ring body 2 is transmitted to the output end cover body through the screw, the power output end cover body is relatively unstable, and the first end cover body 600 is easily deformed by twisting or machining, and the first end cover body 600 is preferably deformed into an integral structure when a load is increased, so that the first end cover body is not firmly deformed, and the first end cover body is preferably integrally formed.

Preferably, the support ring body 2 is provided with a plurality of connecting holes 23 at the other end of the support ring body, which is far away from the first end cover body 600, and is fixed with the first end cover body 600 by screws, so that the support performance of the magnetic exchange ring is well ensured while the installation is more convenient. Preferably, the diameter of the connecting hole 23 (nominal diameter of the internal thread) is b, b < d2/2.5, to ensure structural strength and magnetic shielding effect of the support bar 21.

It will be appreciated that the sides of the support bar 21, except the side facing the outer rotor 200, are attached to the magnetism adjusting ring 2 to ensure the supporting effect, and the side of the support bar 21 facing the outer rotor 200 is preferably designed to be planar, so as to simplify the manufacturing process of the support bar 21.

The invention also provides a magnetic gear, which comprises an inner rotor 100, an outer rotor 200 and a magnetic ring adjusting assembly 300 positioned in an air gap formed by the inner rotor 100 and the outer rotor 200, wherein the magnetic ring adjusting assembly 300 is the magnetic ring adjusting assembly. Specifically, the inner rotor 100 includes an inner core 102 and a plurality of inner permanent magnets 101 surface-mounted on an outer peripheral wall of the inner core 102, the outer rotor 200 includes an outer core 202 and a plurality of outer permanent magnets 201 assembled on an inner peripheral wall of the outer core 202, and it is understood that the pole pair number of the inner permanent magnets 101 is Pin, the pole pair number Pout of the outer permanent magnets 201, and the number Pt of the magnetic regulating protrusions 12 in the magnetic regulating ring assembly should be in line with pt=pin+pout, so as to realize the magnetic modulation function of the magnetic regulating protrusions 12. The inner iron core 102 comprises an inner rotor yoke, inner rotor salient points and an input shaft hole, wherein the inner rotor salient points are formed by laminating soft magnetic materials, the number of the inner rotor salient points is equal to 2Pin of the pole number of an inner permanent magnet, the inner permanent magnet 101 is made of rare earth or ferrite permanent magnet materials, the inner permanent magnet 101 is adhered to the outer surface of the inner iron core 102 in a surface mode, radial magnetization is adopted, the magnetization directions of two adjacent permanent magnets are opposite, the outer iron core 202 comprises an outer rotor yoke and outer rotor salient points, the outer rotor salient points are formed by laminating soft magnetic materials, the number of the outer rotor salient points is equal to 2Pout of the pole number of an outer permanent magnet, the outer permanent magnet is made of rare earth or ferrite permanent magnet materials, the outer permanent magnet is adhered to the inner surface of the outer rotor core in a surface mode, and the magnetization directions of the two adjacent permanent magnets are opposite. The magnetic regulating protrusion 12 is formed by laminating soft magnetic materials.

The inner rotor 100 is sleeved on the power input shaft 700, the power input shaft 700 is respectively mounted on the second end cover 22 (with a bearing chamber thereon) and the first end cover 600 (with a bearing chamber thereon) through the first bearing 400 and the second bearing 500, and meanwhile, one end of the power input shaft 700 corresponding to the second end cover 22 is inserted in the first shaft hole 221 and extends out to be in driving connection with an external power component.

The first end cover 600 is bolted to the second end cover 22, specifically, the second end cover 22 is also provided with a through hole at a position corresponding to the connecting hole 23, the two are connected by a screw, the connecting hole 23 is specifically a blind hole with internal threads, and the screw is made of a high-strength non-magnetic material such as austenitic stainless steel.

According to an embodiment of the present invention, there is further provided a compound motor, including a magnetic gear, where the magnetic gear is the magnetic gear described above.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims

1. A magnetic tuning ring, characterized in that it comprises an annular yoke (11) and a plurality of magnetic tuning protrusions (12) on the outer peripheral side wall of the annular yoke (11), wherein the plurality of magnetic tuning protrusions (12) extend from the inside to the outside along the radial direction of the annular yoke (11), and the free end of the magnetic tuning 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 the circumferential direction of the annular yoke (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=2.5~3.

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

3. The magnetic tuning ring according to claim 1 is characterized in that the number of the teeth (13) on a single magnetic tuning protrusion (12) is N1, the number of pole pairs of the outer rotor (200) is Pout, and 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 comprises a magnetic tuning ring (1) and a supporting ring body (2) capable of supporting the magnetic tuning ring (1), the supporting ring body (2) having a plurality of support strips (21) arranged at intervals along the circumference of the supporting ring body (2), and a mounting groove is formed between any two adjacent support strips (21), the magnetic tuning ring (1) is the magnetic tuning ring described in any one of claims 1 to 3, and the plurality of magnetic tuning protrusions (12) are respectively and one-to-one mounted in the plurality of mounting grooves.

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

6. The magnetic tuning ring assembly according to claim 4 is characterized in that, in the circumferential direction of the annular yoke (11), the width of the magnetic tuning protrusion (12) is a1, the support strip (21) includes a support body (211), the width of the support body (211) is a2, and a1/a2=0.7~0.8.

7. The magnetic tuning ring assembly according to claim 6 is characterized in that the support bar (21) further includes an end support body (212) located on the side of the support body (211) facing the outer rotor (200), and in the radial direction of the annular yoke (11), the thickness of the tooth (13) is d1, the thickness of the support bar (21) is d2, and d1/d2=0.2~0.25.

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

9. The magnetic tuning ring assembly according to claim 7, characterized in that it also includes a first end cover body (600), wherein 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 tuning ring assembly according to claim 9, characterized in that 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 body (600).

11. The magnetic tuning ring assembly according to claim 10, characterized in that the aperture of the connecting hole (23) is b, b<d2/2.5.

12. A magnetic gear, comprising an inner rotor (100), an outer rotor (200), and a magnetic adjustment ring assembly (300) located in an air gap formed by the inner rotor (100) and the outer rotor (200), characterized in that the magnetic adjustment ring assembly (300) is the magnetic adjustment ring assembly described in any one of claims 4 to 11.

13. A composite motor comprising a magnetic gear, wherein the magnetic gear is the magnetic gear according to claim 12.