Torque peak self-feedback permanent magnet coupling and design method thereof

Abstract

The application discloses a torque peak self-feedback permanent magnet coupling and a design method thereof, and belongs to the technical field of mechanical transmission. The torque peak self-feedback permanent magnet coupling comprises a driving cylinder and a driven cylinder. The driving cylinder comprises a driving shaft, a first back iron coaxially fixed on the first end of the driving shaft, a first magnetic ring and a second magnetic ring coaxially and spacedly fixed on the outer peripheral wall of the first back iron in the direction from the second end to the first end of the driving shaft. The driven cylinder comprises a connecting cylinder coaxially sleeved on the outside of the first back iron, a driven shaft coaxially fixed on the connecting cylinder, a second back iron coaxially fixed on the inner peripheral wall of the connecting cylinder, a third magnetic ring fixed on the inner peripheral wall of the second back iron and corresponding to the first magnetic ring, and a fourth magnetic ring corresponding to the second magnetic ring. A gap is left between the third magnetic ring and the first magnetic ring to form a pair of magnetic rings, and a gap is left between the fourth magnetic ring and the second magnetic ring to form a pair of magnetic rings. The torque peak self-feedback permanent magnet coupling can realize self-feedback of the torque peak.

Description

Technical Field

[0001] This invention relates to the field of coupling technology, and in particular to a torque peak self-feedback permanent magnet coupling and its design method. Background Technology

[0002] Permanent magnet couplings transmit power by utilizing the interaction force between the permanent magnets at the driving and driven ends. This allows for torque transmission without direct mechanical contact, completely solving leakage problems in certain mechanical transmission processes. Furthermore, when the load on the prime mover exceeds the maximum torque that the permanent magnet coupling can transmit, the driving and driven ends disengage, providing load isolation and overload protection.

[0003] The maximum transmission torque of a permanent magnet coupling is directly related to the load capacity of the transmission system. Exceeding this maximum torque will cause disengagement. Furthermore, the maximum transmission torque of a permanent magnet coupling varies with factors such as machining errors, permanent magnet characteristics, and the operating environment. The maximum transmission torque of a conventional permanent magnet coupling can only be measured in advance using experimental equipment. It is impossible to predict or determine during use whether the load is about to reach the maximum transmission torque limit, thus hindering its widespread application in high-precision servo drive systems. Summary of the Invention

[0004] To address the technical problems existing in the background art, this invention proposes a torque peak self-feedback permanent magnet coupling and its design method.

[0005] In a first aspect, the present invention proposes a torque peak self-feedback permanent magnet coupling, comprising: a driving cylinder and a driven cylinder: The active cylinder includes: an active shaft, a first back iron, a first magnetic ring, and a second magnetic ring; the first back iron is coaxially fixed to the first end of the active shaft, and the second end of the active shaft extends out from the first back iron; the first magnetic ring and the second magnetic ring are coaxially fixed to the outer peripheral wall of the first back iron in sequence along the direction from the second end to the first end of the active shaft, and a gap is left between the first magnetic ring and the second magnetic ring. The driven cylinder includes a driven shaft, a connecting cylinder, a second back iron, a third magnetic ring, and a fourth magnetic ring. The connecting cylinder is coaxially sleeved outside the first back iron, and one end of the connecting cylinder facing away from the first end of the driving shaft is coaxially and fixedly connected to the driven shaft. The second back iron is coaxially fixed on the inner circumferential wall of the connecting cylinder. A third magnetic ring is fixed on the inner circumferential wall of the second back iron at a position corresponding to the first magnetic ring, and a gap is left between the third magnetic ring and the first magnetic ring. A fourth magnetic ring is fixed on the inner circumferential wall of the second back iron at a position corresponding to the second magnetic ring, and a gap is left between the fourth magnetic ring and the second magnetic ring. The third magnetic ring and the first magnetic ring have the same number of pole pairs, and the first magnetic ring and the third magnetic ring form a pair of magnetic rings. The fourth magnetic ring and the second magnetic ring have the same number of pole pairs, and the second magnetic ring and the fourth magnetic ring form a pair of magnetic rings.

[0006] Preferably, the first magnetic ring includes a plurality of first permanent magnet blocks, which are uniformly and spaced apart and fixed on the outer peripheral wall of the first back iron, and the magnetization directions of any two adjacent first permanent magnet blocks are opposite; the second magnetic ring includes a plurality of second permanent magnet blocks, which are uniformly and spaced apart and fixed on the outer peripheral wall of the first back iron, and the magnetization directions of any two adjacent second permanent magnet blocks are opposite; the number of first permanent magnet blocks and second permanent magnet blocks are different; The third magnetic ring comprises multiple third permanent magnet blocks, which are evenly and spaced apart along the circumference, and the magnetization directions of any two adjacent third permanent magnet blocks are opposite. The fourth magnetic ring comprises multiple fourth permanent magnet blocks, which are evenly and spaced apart along the circumference, and the magnetization directions of any two adjacent fourth permanent magnet blocks are opposite.

[0007] Preferably, the first, second, third and fourth permanent magnet blocks are all radially magnetized permanent magnet blocks.

[0008] Preferably, the inner diameter and outer diameter of each permanent magnet block in the first and second magnetic rings are the same, and the inner diameter and outer diameter of each permanent magnet block in the third and fourth magnetic rings are the same.

[0009] Secondly, the present invention also proposes a design method for a torque peak self-feedback permanent magnet coupling, applicable to the torque peak self-feedback permanent magnet coupling described in any one of the first aspects, characterized in that it includes: S1. Design a multi-peak torque characteristic curve, and select two sine curves with different frequencies from the multi-peak torque characteristic curve to serve as the target transmission torque characteristic curves of the two pairs of magnetic rings of the torque peak self-feedback permanent magnet coupling. S2. Based on the target torque transmission characteristic curves of the two pairs of magnetic coils, the peak torque and frequency characteristics of each pair of magnetic coils are obtained. The dimensions and initial position deflection angles of the two pairs of magnetic coils that satisfy the peak torque and frequency characteristics are calculated using the analytical calculation method of the torque transmission of permanent magnet couplings. The dimensions of the two pairs of magnetic coils include the number of pole pairs, the axial length of the permanent magnet block, and the inner and outer diameters of the permanent magnet block. S3. Based on the dimensions and initial position deflection angles of the two pairs of magnetic coils, establish simulation models of conventional permanent magnet couplings respectively, and calculate the torque transmission characteristic curves of the two pairs of magnetic coils using the finite element method; superimpose the two torque transmission characteristic curves to obtain the torque transmission characteristic curve of the torque peak self-feedback permanent magnet coupling. S4. Compare the torque transmission characteristic curve of the peak torque self-feedback permanent magnet coupling with the multi-peak torque transmission characteristic curve to determine whether the peak and second peak values ​​of the torque transmission characteristic curve of the peak torque self-feedback permanent magnet coupling meet the design requirements of the multi-peak torque transmission characteristic curve. If not, iteratively design the size parameters and initial position deflection angle of the two pairs of magnetic rings until the peak and second peak values ​​of the torque transmission characteristic curve of the peak torque self-feedback permanent magnet coupling meet the design requirements of the multi-peak torque transmission characteristic curve. If yes, output the size and initial position deflection angle of the two pairs of magnetic rings.

[0010] Preferably, in S1, a multi-peak torque characteristic curve is designed, specifically including: By adjusting the frequency, initial deflection angle, and amplitude of the two sine curves, the two sine curves are superimposed to form a multi-peak torque characteristic curve.

[0011] Preferably, the multi-peaked torque characteristic curve includes a bimodal curve, and the typical expression for a bimodal curve is as follows: ; The bimodal curve is obtained by superimposing the first sine curve and the second sine curve. The first sine curve is... The second sine curve is .

[0012] Preferably, the multi-peaked torque characteristic curve includes a three-peaked curve, and the expression for the three-peaked curve is as follows: ; The three-peaked curve is obtained by superimposing the third and fourth sine curves. The expression for the third sine curve is: The expression for the fourth sine curve is: .

[0013] In this invention, the proposed torque peak self-feedback permanent magnet coupling and its design method, through the design and combination of two pairs of magnetic rings, make the torque transmission curve of the permanent magnet coupling present a multi-peak shape, with one peak and several secondary peaks. This facilitates subsequent judgment of whether the torque is about to reach the peak by detecting the torque fluctuation phenomenon that occurs when the load torque exceeds the secondary peak, thereby realizing the self-feedback of the torque peak. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the torque peak self-feedback permanent magnet coupling in one embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the active cylinder in one embodiment of the present invention.

[0016] Figure 3 This is a schematic diagram of the driven cylinder in one embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the structure of two pairs of magnetic coils in one embodiment of the present invention.

[0018] Figure 5 This is a flowchart illustrating the design method of a torque peak self-feedback permanent magnet coupling in one embodiment of the present invention.

[0019] Figure 6 This is a schematic diagram of a bimodal curve and its Fourier decomposition results in one embodiment of the present invention.

[0020] Figure 7 This is a schematic diagram of a three-peaked curve and its Fourier decomposition results in one embodiment of the present invention.

[0021] Figure label: 1-Driven shaft 2-Connecting cylinder 3-Second back iron 4-Third magnetic ring 5-Fourth magnet 6-First magnetic ring 7-Second magnetic coil; 8-First back iron; 9-Drive shaft Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Firstly, referring to Figures 1-4 The present invention proposes a torque peak self-feedback permanent magnet coupling, comprising: a driving cylinder and a driven cylinder: The active cylinder includes: an active shaft 9, a first back iron 8, a first magnetic ring 6, and a second magnetic ring 7; the first back iron 8 is coaxially fixed to the first end of the active shaft 9, and the second end of the active shaft 9 extends out from the first back iron 8; the first magnetic ring 6 and the second magnetic ring 7 are coaxially fixed to the outer peripheral wall of the first back iron 8 in sequence along the direction from the second end to the first end of the active shaft 9, and a gap is left between the first magnetic ring 6 and the second magnetic ring 7; The driven cylinder includes a driven shaft 1, a connecting cylinder 2, a second back iron 3, a third magnetic ring 4, and a fourth magnetic ring 5. The connecting cylinder 2 is coaxially sleeved outside the first back iron 8, and one end of the connecting cylinder 2 facing away from the first end of the driving shaft 9 is coaxially fixedly connected to the driven shaft 1. The second back iron 3 is coaxially fixed on the inner peripheral wall of the connecting cylinder 2. The third magnetic ring 4 is fixed on the inner peripheral wall of the second back iron 3 at a position corresponding to the first magnetic ring 6, and a gap is left between the third magnetic ring 4 and the first magnetic ring 6. The fourth magnetic ring 5 is fixed on the inner peripheral wall of the second back iron 3 at a position corresponding to the second magnetic ring 7, and a gap is left between the fourth magnetic ring 5 and the second magnetic ring 7. The third magnetic ring 4 has the same number of pole pairs as the first magnetic ring 6, and the fourth magnetic ring 5 has the same number of pole pairs as the second magnetic ring 7.

[0024] The first magnetic ring 6 includes multiple first permanent magnet blocks, which are uniformly and spaced apart and fixed on the outer peripheral wall of the first back iron 8. The magnetization directions of any two adjacent first permanent magnet blocks are opposite. The second magnetic ring 7 includes multiple second permanent magnet blocks, which are uniformly and spaced apart and fixed on the outer peripheral wall of the first back iron. The magnetization directions of any two adjacent second permanent magnet blocks are opposite. The number of first permanent magnet blocks and second permanent magnet blocks are different. The third magnetic ring 4 includes multiple third permanent magnet blocks, which are evenly distributed and spaced apart along the circumference, and the magnetization directions of any two adjacent third permanent magnet blocks are opposite; the fourth magnetic ring 5 includes multiple fourth permanent magnet blocks, which are evenly distributed and spaced apart along the circumference, and the magnetization directions of any two adjacent fourth permanent magnet blocks are opposite.

[0025] In this embodiment, the first, second, third, and fourth permanent magnet blocks are all radially magnetized permanent magnet blocks.

[0026] In this embodiment, the first magnetic ring 6 and the third magnetic ring 4 form one pair of magnetic rings, and the second magnetic ring 7 and the fourth magnetic ring 5 form another pair of magnetic rings. By setting the dimensions between the two pairs of magnetic rings in the axial direction, i.e., maintaining a reasonable gap distance, it is possible to facilitate installation while avoiding mutual interference between the magnetic fields of the two pairs of magnetic rings.

[0027] This invention, through the design and combination of two pairs of magnetic coils, makes the torque transmission curve of the torque peak self-feedback permanent magnet coupling present a multi-peak shape, with one peak and several secondary peaks. This facilitates subsequent detection of torque fluctuations that occur when the load torque exceeds the secondary peak to determine whether the torque is about to reach the peak, thereby achieving self-feedback of the torque peak.

[0028] This embodiment avoids local magnetic field oversaturation in the first back iron 8 and the second back iron 3 by setting up uniformly and spaced permanent magnet blocks in each magnetic ring, thus effectively improving the utilization rate of the permanent magnet blocks.

[0029] In this embodiment, the first back iron 8 can be processed in sections and then assembled by flanges, or it can be machined as a whole.

[0030] In this embodiment, the drive shaft 9 and the first back iron 8 are connected by a keyway or flange or other structure.

[0031] In this embodiment, each permanent magnet block in the first magnetic coil 6 and the second magnetic coil 7 is installed on the outer peripheral wall of the first back iron 8 by adhesive, fastening sleeve or other structure.

[0032] In this embodiment, the connecting cylinder 2 can be processed in sections and then assembled by flanges, or it can be machined as a whole.

[0033] In this embodiment, the driven shaft 1 and the connecting cylinder 2 are connected by a keyway or flange or other structures.

[0034] In this embodiment, the outer peripheral wall of the second back iron 3 and the inner peripheral wall of the connecting cylinder 2 are fixed by a tight fit.

[0035] In this embodiment, each permanent magnet block in the third magnetic coil 4 and the fourth magnetic coil 5 is mounted on the inner surface of the second back iron 3 by adhesive, fastening sleeve or other structure.

[0036] To facilitate processing and installation, in this embodiment, the inner diameter and outer diameter of each permanent magnet block of the first magnetic ring 6 and the second magnetic ring 7 are the same, and the inner diameter and outer diameter of each permanent magnet block of the third magnetic ring 4 and the fourth magnetic ring 5 are the same.

[0037] In this embodiment, when the driving cylinder and the driven cylinder deflect by an angle under the action of external force, because the number of magnetic poles is different, the torque transmission characteristic curves generated by the two pairs of magnetic rings have different periods. The superimposed torque transmission characteristic curves are multi-peaked, with one peak and at least one sub-peak. When the load torque exceeds the sub-peak, a torque fluctuation will occur. At the same time, since the peak value is not exceeded, the motion will not disengage. By detecting the torque fluctuation phenomenon, it can be determined that the torque is about to reach the peak value, thereby realizing the self-feedback of the torque peak value.

[0038] Secondly, such as Figure 4 As shown, this invention also proposes a design method for a torque peak self-feedback permanent magnet coupling, comprising: S1. Design a multi-peak torque characteristic curve, and select two sine curves with different frequencies from the multi-peak torque characteristic curve to serve as the target transmission torque characteristic curves of the two pairs of magnetic rings of the torque peak self-feedback permanent magnet coupling. S2. Based on the target torque transmission characteristic curves of the two pairs of magnetic coils, the peak torque and frequency characteristics of each pair of magnetic coils are obtained. The dimensions and initial position deflection angles of the two pairs of magnetic coils that satisfy the peak torque and frequency characteristics are calculated using the analytical calculation method of the torque transmission of permanent magnet couplings. The dimensions of the two pairs of magnetic coils include the number of pole pairs, the axial length of the permanent magnet block, and the inner and outer diameters of the permanent magnet block. S3. Establish simulation models of conventional permanent magnet couplings based on the dimensions of the two pairs of magnetic coils, and calculate the torque transmission characteristic curves of the two pairs of magnetic coils using the finite element method. Superimpose the two torque transmission characteristic curves to obtain the torque transmission characteristic curve of the torque peak self-feedback permanent magnet coupling. S4. Compare the torque transmission characteristic curve of the self-feedback permanent magnet coupling obtained in S3 with the multi-peak torque transmission characteristic curve designed in S1 to determine whether the peak and second peak values ​​of the torque transmission characteristic curve of the self-feedback permanent magnet coupling meet the design requirements. If not, proceed to S2, that is, iteratively design the size and initial position deflection angle parameters of the two pairs of magnetic rings until the peak and second peak values ​​of the multi-peak torque transmission characteristic curve that meet the requirements are obtained. If yes, output the size and initial position deflection angle of the two pairs of magnetic rings.

[0039] This involves adjusting the frequencies, initial deflection angles, and amplitudes of two sine curves to create a multi-peaked curve through their superposition. This multi-peaked curve should have at least one peak and one secondary peak, with the secondary peak being smaller than the peak. Commonly seen curves are bimodal and trimodal. The frequency of the target torque transmission characteristic curve for the two pairs of magnetic coils is equal to the number of pole pairs; the frequency should be chosen for ease of engineering implementation.

[0040] It is important to understand that the torque transmission characteristic curve of a conventional permanent magnet coupling is single-peaked. The maximum transmission torque of a conventional permanent magnet coupling can only be measured in advance through experimental equipment. It is impossible to predict and judge whether the load is about to reach the upper limit of the maximum transmission torque during use, which hinders its widespread application in high-precision servo drive systems.

[0041] The present invention proposes a design method for a torque peak self-feedback permanent magnet coupling, which can design a torque peak self-feedback permanent magnet coupling that meets preset requirements, such as the upper limit of the maximum transmitted torque, without the need to be measured by experimental equipment. Moreover, by introducing Fourier decomposition into the design of permanent magnet couplings, the torque transmission curve can be designed, thus expanding the design ideas and application scenarios of permanent magnet couplings.

[0042] The present invention will now be described in conjunction with specific embodiments.

[0043] Example 1 This embodiment provides a design method for a torque peak self-feedback permanent magnet coupling. (See also...) Figure 5 The method includes the following steps: S1. Design a bimodal curve; where the expression for the bimodal curve is: It can be decomposed into two sine curves, such as Figure 6 As shown; the decomposition result includes a first sine curve and a second sine curve, the first sine curve being... The second sine curve is ; The first sine curve is used as the target torque transmission curve for the first pair of magnetic coils, and the second sine curve is used as the target torque transmission curve for the second pair of magnetic coils. S2. Ignoring the mutual influence between the two pairs of magnetic coils, each pair of magnetic coils is designed as a separate conventional permanent magnet coupling. The peak torque and frequency characteristics of each pair of magnetic coils are calculated using analytical formulas. Based on the peak torque and frequency characteristics of each pair of magnetic coils, the dimensions and initial position deflection angles of the two pairs of magnetic coils that satisfy their respective peak torque and frequency characteristics are calculated. The dimensions of the two pairs of magnetic coils are the number of pole pairs, the axial length of the permanent magnet block, and the inner and outer diameters of the permanent magnet block. Generally, for ease of processing and installation, the inner and outer diameters of each permanent magnet block of the first magnetic coil 6 and the second magnetic coil 7 are the same, as are the inner and outer diameters of each permanent magnet block of the third magnetic coil 4 and the fourth magnetic coil 5. When the first pair of magnetic coils has 2 pole pairs, the second pair of magnetic coils has 4 pole pairs. S3. Based on the specific dimensions and initial position deflection angle of the two pairs of magnetic rings, establish a simulation model of a conventional permanent magnet coupling, and use the finite element method to calculate the torque transmission characteristic curves of the two pairs of magnetic rings respectively. By superimposing the two torque transmission characteristic curves, the actual torque transmission characteristic curve of the torque peak self-feedback permanent magnet coupling can be obtained. S4. Compare the obtained torque transmission characteristic curve with the designed bimodal curve to determine whether the peak value, second peak value, and frequency characteristics of the torque transmission characteristic curve of the self-feedback permanent magnet coupling meet the design requirements. If not, repeat S2-S3 until the peak value, second peak value, and frequency characteristics meet the design requirements. If yes, obtain the size and initial position deflection angle of the two pairs of magnetic rings.

[0044] Example 2

[0045] This example provides a design method for a torque peak self-feedback permanent magnet coupling. This method is similar to that in Example 1, except that a three-peak curve is used as the torque transmission characteristic curve. Furthermore, in this embodiment, the first pair of magnetic coils has 2 pole pairs, and the second pair of magnetic coils has 10 pole pairs. See also... Figure 7 The expression for the three-peak curve in this embodiment is: .

[0046] The decomposition of the trimodal curve includes a third sine curve and a fourth sine curve. The expression for the third sine curve is: The expression for the fourth sine curve is: .

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A torque peak self-feedback permanent magnet coupling, characterized in that, include: Driving cylinder and driven cylinder: The active cylinder includes: an active shaft, a first back iron, a first magnetic ring, and a second magnetic ring; the first back iron is coaxially fixed to the first end of the active shaft, and the second end of the active shaft extends out of the first back iron; the first magnetic ring and the second magnetic ring are coaxially and spaced apart on the outer peripheral wall of the first back iron along the direction from the second end to the first end of the active shaft. The driven cylinder includes a driven shaft, a connecting cylinder, a second back iron, a third magnetic ring, and a fourth magnetic ring. The connecting cylinder is coaxially sleeved outside the first back iron, and one end of the connecting cylinder facing away from the first end of the driving shaft is coaxially and fixedly connected to the driven shaft. The second back iron is coaxially fixed on the inner circumferential wall of the connecting cylinder. A third magnetic ring is fixed on the inner circumferential wall of the second back iron at a position corresponding to the first magnetic ring, and a gap is left between the third magnetic ring and the first magnetic ring. A fourth magnetic ring is fixed on the inner circumferential wall of the second back iron at a position corresponding to the second magnetic ring, and a gap is left between the fourth magnetic ring and the second magnetic ring. The third magnetic ring and the first magnetic ring have the same number of pole pairs, and the first magnetic ring and the third magnetic ring form a pair of magnetic rings. The fourth magnetic ring and the second magnetic ring have the same number of pole pairs, and the second magnetic ring and the fourth magnetic ring form a pair of magnetic rings. The first magnetic ring comprises multiple first permanent magnet blocks, which are uniformly and spaced apart and fixed to the outer peripheral wall of the first back iron, with the magnetization directions of any two adjacent first permanent magnet blocks being opposite; the second magnetic ring comprises multiple second permanent magnet blocks, which are uniformly and spaced apart and fixed to the outer peripheral wall of the first back iron, with the magnetization directions of any two adjacent second permanent magnet blocks being opposite; the number of first permanent magnet blocks and second permanent magnet blocks are different; The third magnetic ring comprises multiple third permanent magnet blocks, which are evenly and spaced apart along the circumference, and the magnetization directions of any two adjacent third permanent magnet blocks are opposite. The fourth magnetic ring comprises multiple fourth permanent magnet blocks, which are evenly and spaced apart along the circumference, and the magnetization directions of any two adjacent fourth permanent magnet blocks are opposite.

2. The torque peak self-feedback permanent magnet coupling according to claim 1, characterized in that, The first, second, third, and fourth permanent magnet blocks are all radially magnetized permanent magnet blocks.

3. The torque peak self-feedback permanent magnet coupling according to claim 1, characterized in that, The inner diameter and outer diameter of each permanent magnet block in the first and second magnetic coils are the same, and the inner diameter and outer diameter of each permanent magnet block in the third and fourth magnetic coils are the same.

4. A design method for a torque peak self-feedback permanent magnet coupling, applied to the torque peak self-feedback permanent magnet coupling according to any one of claims 1-3, characterized in that, include: S1. Design a multi-peak torque characteristic curve, and select two sine curves with different frequencies from the multi-peak torque characteristic curve to serve as the target transmission torque characteristic curves of the two pairs of magnetic rings of the torque peak self-feedback permanent magnet coupling. S2. Based on the target torque transmission characteristic curves of the two pairs of magnetic coils, the peak torque and frequency characteristics of each pair of magnetic coils are obtained. The dimensions and initial position deflection angles of the two pairs of magnetic coils that satisfy the peak torque and frequency characteristics are calculated using the analytical calculation method of the torque transmission of permanent magnet couplings. The dimensions of the two pairs of magnetic coils include the number of pole pairs, the axial length of the permanent magnet block, and the inner and outer diameters of the permanent magnet block. S3. Based on the dimensions and initial position deflection angles of the two pairs of magnetic coils, establish simulation models of conventional permanent magnet couplings respectively, and calculate the torque transmission characteristic curves of the two pairs of magnetic coils using the finite element method; superimpose the two torque transmission characteristic curves to obtain the torque transmission characteristic curve of the torque peak self-feedback permanent magnet coupling. S4. Compare the torque transmission characteristic curve of the peak torque self-feedback permanent magnet coupling with the multi-peak torque transmission characteristic curve to determine whether the peak and second peak values ​​of the torque transmission characteristic curve of the peak torque self-feedback permanent magnet coupling meet the design requirements of the multi-peak torque transmission characteristic curve; if not, proceed to S2; if yes, output the size and initial position deflection angle of the two pairs of magnetic rings.

5. The design method of the torque peak self-feedback permanent magnet coupling according to claim 4, characterized in that, In S1, a multi-peak torque characteristic curve is designed, specifically including: By adjusting the frequency, initial deflection angle, and amplitude of the two sine curves, the two sine curves are superimposed to form a multi-peak torque characteristic curve.

6. The design method of the torque peak self-feedback permanent magnet coupling according to claim 4, characterized in that, Multi-peak torque characteristic curves include bimodal curves, and the expression for a bimodal curve is: ; The bimodal curve is obtained by superimposing the first sine curve and the second sine curve. The first sine curve is... ; The second sine curve is .

7. The design method of the torque peak self-feedback permanent magnet coupling according to claim 4, characterized in that, The multi-peaked torque characteristic curve includes a three-peaked curve, and the expression for the three-peaked curve is as follows: ; The three-peaked curve is obtained by superimposing the third and fourth sine curves. The expression for the third sine curve is: The expression for the fourth sine curve is: .

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