A cylinder type self-adjusting air-gap permanent magnet soft connection device

Abstract

The present application relates to the technical field of mechanical transmission, in particular to a cylinder type self-adjusting air gap permanent magnet soft connection device, comprising: a first connecting shaft adapted to connect a load; a second connecting shaft adapted to connect a drive and coaxial with the first connecting shaft; a conductor rotor comprising a conductor ring and a cylindrical conductor ring carrier, the conductor ring carrier is fixed on the first connecting shaft, and the conductor ring is fixed on the inner wall of the conductor ring carrier; a permanent magnet rotor located between the conductor ring and the second connecting shaft and coaxial with the conductor ring, the permanent magnet rotor comprises a permanent magnet carrier, the permanent magnet carrier comprises at least two carrier blocks uniformly distributed along the circumference of the second connecting shaft, the carrier blocks are installed on the second connecting shaft and can slide in the radial direction of the second connecting shaft, each carrier block is fixed with a permanent magnet on the surface facing the conductor ring, and each carrier block is connected with an elastic member adapted to hinder the radial outward sliding of the carrier block. By adopting the above scheme, the automatic adjustment of the air gap can be realized during starting, the structure is simple, the weight is light, and the cost is low.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet coupler technology, and more specifically to a cylindrical self-adjusting air gap permanent magnet soft connection device. Background Technology

[0002] To address the problem of excessive starting torque, a hydraulic coupling or soft starter is typically added between the motor and the load. Hydraulic couplings can delay motor start-up time and reduce starting shock, but they suffer from low efficiency, oil leakage, and large footprint. Conventional soft starters can achieve soft starting of the system, but they all require dedicated control systems, resulting in complex structures and inconvenient maintenance.

[0003] To address these issues, permanent magnet couplers have been developed specifically to solve the aforementioned problems. Existing permanent magnet couplers mainly include disc-type and cylindrical-type couplers. Disc-type couplers have an axial air gap between the induction rotor and the permanent magnet rotor; cylindrical-type couplers have a radial air gap between the induction rotor and the permanent magnet rotor. Both types of couplers rely on the magnetic field lines generated by the conductor in the induction rotor cutting the magnets in the permanent magnet rotor to produce an induced magnetic field. The interaction of these two magnetic fields transmits torque.

[0004] To improve efficiency, existing permanent magnet couplers typically have a slip ratio of no more than 4%, meaning the slip at rated torque does not exceed 60 rpm. This is because a higher slip ratio leads to severe overheating of the conductor discs and reduced efficiency. However, a low slip ratio causes the permanent magnet coupler to reach its rated torque at the moment of motor startup, resulting in a large startup shock. This can cause the motor to fail to drive the load, resulting in a "stalled" state, or momentarily exceeding the maximum torque and surpassing the coupler's optimal operating slip speed, leading to continuous high slip operation, low efficiency, and severe overheating. Furthermore, for loads with high starting inertia, this can cause motor overload and prevent starting. To address these issues, some permanent magnet couplers have added external actuators to adjust the air gap, thereby regulating the slip. However, these mechanisms are complex, heavier, and increase the additional rotational inertia, making it difficult to eliminate additional vibration factors in high-speed or high-power equipment. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the existing adjustable air gap permanent magnet coupler in terms of complex structure and heavy weight, so as to provide a disc-type permanent magnet soft connection device that can self-adjust air gap.

[0006] To solve the above-mentioned technical problems, the present invention provides a cylindrical self-adjusting air gap permanent magnet flexible connection device, comprising:

[0007] The first connecting shaft is suitable for connecting a load;

[0008] The second connecting shaft is adapted to connect to the drive and is coaxial with the first connecting shaft;

[0009] A conductor rotor includes a conductor ring and a cylindrical conductor ring carrier, the conductor ring carrier being fixed relative to the first connecting shaft, and the conductor ring being fixed to the inner wall of the conductor ring carrier;

[0010] A permanent magnet rotor is located between the conductor ring and the second connecting shaft and is coaxial with the conductor ring. The permanent magnet rotor includes a permanent magnet carrier. The permanent magnet carrier includes at least two carrier blocks evenly distributed circumferentially along the second connecting shaft. The carrier blocks are mounted on the second connecting shaft and can slide radially along the second connecting shaft. A permanent magnet is fixed on the surface of each carrier block facing the conductor ring. Each carrier block is connected to an elastic element suitable for preventing its radial outward sliding.

[0011] Optionally, the second connecting shaft corresponding to the shaft segment of the permanent magnet rotor is configured as a hollow shaft, and the permanent magnet rotor further includes:

[0012] A guide rod is fixed or integrally formed on the surface of the carrier block facing the second connecting shaft and arranged radially along the second connecting shaft. The guide rod passes through the shaft wall of the second connecting shaft.

[0013] A limiting member is provided to prevent the guide rod from disengaging from the second connecting shaft. The limiting member is fixed or integrally formed on the inner end of the guide rod.

[0014] Optionally, the elastic element is a compression elastic element, one end of the elastic element abuts against the second connecting shaft, and the other end of the elastic element abuts against the limiting element.

[0015] Optionally, the inner end of the guide rod is provided with external threads and scale lines, and the limiting member is a nut screwed onto the inner end of the guide rod.

[0016] Optionally, the end face of the second connecting shaft near the first connecting shaft is sealed and a connecting portion is protruding in the middle. The elastic element is a tensile elastic element, one end of the elastic element is connected to the carrier block, and the other end of the elastic element is connected to the connecting portion.

[0017] Optionally, the elastic element is a tensile elastic element, and the two ends of the elastic element are respectively connected to two adjacent carrier blocks.

[0018] Optionally, the elastic element can be detachably installed or its length can be adjusted.

[0019] Optionally, the outer circumferential surface of the conductor ring carrier is provided with heat dissipation teeth.

[0020] Optionally, the permanent magnet rotor further includes:

[0021] A pressure plate is fixed to the carrier block and is adapted to press the permanent magnet onto the carrier block.

[0022] Optionally, the second connecting shaft includes:

[0023] Connecting shaft;

[0024] The mounting shaft is coaxially and fixedly connected to the connecting shaft, and is suitable for mounting the permanent magnet rotor.

[0025] The technical solution of this invention has the following advantages:

[0026] 1. The cylindrical self-adjusting air gap permanent magnet soft connection device provided by the present invention utilizes the centrifugal force during rotation to gradually move the carrier block radially outward, so that the permanent magnet gradually approaches the conductor ring, thereby slowly reducing the air gap, increasing the density of magnetic lines of force cut by the induction rotor, and slowly increasing the load torque. The maximum torque in the motor starting torque curve is used to drive the load to start, thus realizing the no-load start of the motor. The starting current is small, the impact on the load is small, and after the start is completed, the slip during rated operation is small, the efficiency is high, the slip heat of the body can be reduced, and the safety and reliability of use are improved.

[0027] 2. The cylindrical self-adjusting air gap permanent magnet soft connection device provided by the present invention includes at least two carrier blocks evenly distributed along the circumference of the permanent magnet carrier. By sliding the carrier blocks relative to the second connecting shaft and cooperating with the elastic element, the automatic adjustment of the air gap during the start-up process can be realized. Compared with the permanent magnet couplers of existing peripheral actuators, it has low production cost, simple structure, and light weight, which can reduce the load on the shaft and help make the product suitable for higher speed and higher power scenarios, and also helps to reduce vibration. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the permanent magnet soft connection device in the no-load start-up state according to Embodiment 1 of the present invention;

[0030] Figure 2 for Figure 1 Sectional view at point AA;

[0031] Figure 3 This is a schematic diagram of the rated operating state structure of the permanent magnet flexible connection device according to Embodiment 1 of the present invention;

[0032] Figure 4 for Figure 3 Sectional view at point BB;

[0033] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0035] Figure 7 for Figure 6 Sectional view at point CC.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. First connecting shaft; 2. Second connecting shaft; 21. Connecting shaft; 22. Mounting shaft; 221. Connecting part; 3. Conductor rotor; 31. Conductor ring; 32. Conductor ring carrier; 321. Heat dissipation teeth; 4. Permanent magnet rotor; 41. Permanent magnet carrier; 411. Carrier block; 42. Permanent magnet; 43. Pressure plate; 44. Guide rod; 45. Elastic element; 46. Limiting element. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Example 1

[0043] Reference Figures 1-4 The cylindrical self-adjusting air gap permanent magnet flexible connection device provided in this embodiment includes:

[0044] First connecting shaft 1, suitable for connecting load;

[0045] The second connecting shaft 2 is adapted to connect to the drive and is coaxial with the first connecting shaft 1;

[0046] The conductor rotor 3 includes a conductor ring 31 and a cylindrical conductor ring carrier 32. The conductor ring carrier 32 is relatively fixed to the first connecting shaft 1, and the conductor ring 31 is fixed to the inner wall of the conductor ring carrier 32. As is known to those skilled in the art, the conductor ring carrier 32, the conductor ring 31, and the first connecting shaft 1 are coaxial. "Cylindrical" refers to a hollow cylindrical structure open at both ends. "Relatively fixed" can be direct fixing or indirect fixing to the first connecting shaft 1 via connectors. Indirect fixing is preferred, as it increases the diameter of the conductor ring 31, providing more space for the installation of the permanent magnet rotor 4. Figure 1 As shown in the figure; it should be noted that if the conductor ring carrier 32 is indirectly fixed to the first connecting shaft 1 through the connector, and the conductor ring carrier 32 and the connector are integrally formed, the overall structure should also be considered to include the cylindrical conductor ring carrier 32. It is just that the connector is fixed to the conductor ring carrier 32 in an integral form. Therefore, this structure also falls within the protection scope of this application.

[0047] A permanent magnet rotor 4 is located between the conductor ring 31 and the second connecting shaft 2 and is coaxial with the conductor ring 31. The permanent magnet rotor 4 includes a permanent magnet carrier 41. The permanent magnet carrier 41 includes at least two carrier blocks 411 evenly distributed circumferentially along the second connecting shaft 2. The carrier blocks 411 are mounted on the second connecting shaft 2 and can slide radially along the second connecting shaft 2. A permanent magnet 42 is fixed on the surface of each carrier block 411 facing the conductor ring 31. Each carrier block 411 is connected to an elastic element 45 suitable for preventing its radial outward sliding. The elastic element 45 can be a spring, elastic rope, etc.

[0048] The cylindrical self-adjusting air gap permanent magnet flexible connection device of this application divides the permanent magnet carrier 41 into multiple carrier blocks 411 evenly distributed along the circumference. Each carrier block 411 can be slidably mounted on the second connecting shaft 2 along the radial direction and is connected to an elastic element 45 that hinders its radial outward movement. When started, the carrier block 411 is at the innermost radial limit position, and the air gap between the conductor ring 31 and the permanent magnet 42 is the largest, which is equivalent to the no-load start of a traditional motor. After starting, as the rotational speed of the second connecting shaft 2 increases, the centrifugal force on the carrier block 411 slowly increases. When the centrifugal force is greater than the resistance force of the elastic element 45, the carrier block 411 will move radially outward along the second connecting shaft 2, thereby reducing the air gap between the permanent magnet 42 and the conductor ring 31, reducing the slip, increasing the magnetic induction, and slowly increasing the load torque until the carrier block 411 moves to the outermost radial limit position and stops moving. At this time, the optimal operating clearance is reached. In this state, the air gap is the smallest, the slip of the rated torque is the smallest, the heat generation is the smallest, and the efficiency is the highest. The core inventive point of this application is that the structural basis for achieving the above-mentioned air gap adjustment is not an externally added actuator, but an automated adjustment achieved through the sliding arrangement of the carrier block 411 relative to the second connecting shaft 2 and the elastic element 45. This results in low cost, simple structure, low weight, reduced shaft load, and makes the product suitable for higher speed and higher power scenarios.

[0049] Reference Figure 1 This embodiment provides a preferred sliding installation structure for the carrier block 411: the second connecting shaft 2 corresponding to the shaft segment of the permanent magnet rotor 4 is set as a hollow shaft, and the permanent magnet rotor 4 further includes:

[0050] The guide rod 44 is fixed or integrally formed on the surface of the carrier block 411 facing the second connecting shaft 2 and arranged radially along the second connecting shaft 2. The guide rod 44 penetrates the shaft wall of the second connecting shaft 2.

[0051] The limiting member 46 is adapted to prevent the guide rod 44 from disengaging from the second connecting shaft 2. The limiting member 46 is fixed or integrally formed on the inner end of the guide rod 44.

[0052] In other embodiments, a guide rod 44 may be protruded on the outer peripheral surface of the second connecting shaft 2, and then the carrier block 411 may be slidably mounted on the guide rod 44, or other commonly used sliding structures may be used.

[0053] Compared with other embodiments, in this embodiment, the extreme inward position of the carrier block 411 can directly contact the second connecting shaft 2, resulting in a more compact structure and saving installation space.

[0054] Reference Figures 1-4This embodiment provides a preferred structure for the elastic element 45: the elastic element 45 is a compression elastic element, preferably a compression spring, one end of the elastic element 45 abuts against the second connecting shaft 2, and the other end of the elastic element 45 abuts against the limiting element 46; the limiting element 46 can be a detachable and fixed part such as a nut, or it can be a non-detachable part that is welded and fixed.

[0055] Preferably, the inner end of the guide rod 44 is provided with an external thread and a scale line, and the limiting member 46 is a nut screwed onto the inner end of the guide rod 44. It has three functions: first, the initial compression force of the elastic member 45 can be adjusted by the nut in conjunction with the scale line, ensuring that the compression force of each elastic member 45 is consistent, and the nut acts as a pre-tightener on the elastic member 45; second, the elastic force of the elastic member 45 can be adjusted by the nut to adapt to motors with different speeds; third, the permanent magnet 42 is controlled to move radially at a certain speed to achieve the normal operating air gap.

[0056] This structure requires fewer parts, is simpler, and has a lower cost.

[0057] This embodiment also provides an improved structure for the conductor ring carrier 32: the outer circumferential surface of the conductor ring carrier 32 is provided with heat dissipation teeth 321. Because the permanent magnet 42 and the conductor ring 31 require a certain slip rotational speed during transmission, slip loss is generated during operation and dissipated as heat. By adopting this structure, the heat dissipation teeth 321 can improve the heat dissipation efficiency of the conductor ring carrier 32. Preferably, the heat dissipation teeth 321 are multiple annular teeth, which can further improve the heat dissipation efficiency.

[0058] This embodiment also provides a preferred mounting structure for the permanent magnet 42, wherein the permanent magnet rotor 4 further includes:

[0059] The pressure plate 43 is fixed on the carrier block 411 and is adapted to press the permanent magnet 42 onto the carrier block 411.

[0060] Specifically, such as Figure 2 As shown, each carrier block 411 is equipped with two permanent magnets 42 and three pressure plates 43. The permanent magnets 42 and pressure plates 43 are arranged at intervals. The pressure plates 43 are fixed to the carrier block 411 by bolts. The pressure plates 43 press the permanent magnets 42 through the stepped surface. The magnetic poles of the two permanent magnets 42 are opposite.

[0061] In other embodiments, the permanent magnet 42 can also be fixed to the carrier block 411 by other common structures, such as opening a T-shaped groove on the carrier block 411, inverting the T-shaped groove, and then inserting the permanent magnet 42 that matches the shape of the T-shaped groove from the side; or a dovetail groove can also be used.

[0062] Reference Figure 1This embodiment also provides a specific structure for the second connecting shaft 2, including:

[0063] Connecting shaft 21;

[0064] Mounting shaft 22 is coaxially and fixedly connected to the connecting shaft 21, and is suitable for mounting the permanent magnet rotor 4.

[0065] Specifically, while ensuring the sliding length of the guide rod 44, the outer circumference of the mounting shaft 22 is designed with a multi-step structure, which can reduce the weight of the mounting shaft 22.

[0066] By adopting the above structure, the internal installation space can be expanded by designing the inner diameter of the mounting shaft 22 to be larger than the inner diameter of the connecting shaft 21. Furthermore, during assembly, the permanent magnet rotor 4 is first installed on the mounting shaft 22, and then the whole assembly is installed on the second connecting shaft 2, making the installation more convenient and easier.

[0067] In this embodiment, the conductor ring 31 is made of a material with high conductivity, such as aluminum (alloy) or copper (alloy); the carrier conductor ring carrier 32 is made of a non-magnetic material with good heat dissipation, such as aluminum (alloy); the permanent magnet 42 is made of rare earth permanent magnet material; the pressure plate 43 is made of a non-magnetic material, such as stainless steel or aluminum (alloy); the carrier block 411 is made of a non-magnetic material, such as stainless steel or aluminum (alloy); and the mounting shaft 22 can be made of either a magnetic or non-magnetic material.

[0068] As a specific implementation, the working process of the permanent magnet flexible connection device of the present invention is as follows:

[0069] First, connect the second connecting shaft 2 to the drive end, and connect the first connecting shaft 1 to the load.

[0070] Reference Figure 1 and Figure 2 When starting, the carrier block 411 is in the innermost radial limit position under the action of the elastic element 45. At this time, the air gap between the permanent magnet 42 and the conductor ring 31 is the largest. Starting in this state is equivalent to starting under no-load conditions.

[0071] After startup, as the rotational speed of the second connecting shaft 2 increases, the centrifugal force on the carrier block 411 increases. When the centrifugal force on it is greater than the elastic force of the elastic element 45, the carrier block 411 will move outward along the guide rod 44, thereby reducing the air gap between the permanent magnet 42 and the conductor ring 31, increasing the torque, and thus driving the load to rotate.

[0072] Under centrifugal force, the carrier block 411 gradually moves radially outward until it reaches its limit position and stops moving. At this point, the air gap between the permanent magnet 42 and the conductor ring 31 is minimal, and the efficiency is highest. Figure 3 and Figure 4 As shown, this state is the rated operating state.

[0073] When the machine stops, the rotational speed of the second connecting shaft 2 decreases, and the centrifugal force on the carrier block 411 is insufficient to overcome the elastic force of the elastic element 45. Therefore, the carrier block 411 will slide inward along the guide rod 44 until it contacts the second connecting shaft 23. At this time, the carrier block 411 will also return to its original position under the action of the elastic element 45. Figure 1 and Figure 2 The state shown.

[0074] Example 2

[0075] Reference Figure 5 The only difference between this embodiment and Embodiment 1 is the installation structure of the elastic element 45, as detailed below:

[0076] The second connecting shaft 2 has an end face sealed near the first connecting shaft 1 and a connecting portion 221 protruding from the middle. The elastic element 45 is a tensile elastic element, with one end connected to the carrier block 411 and the other end connected to the connecting portion 221. The tensile force of the elastic element 45 drives the carrier block 411 closer to the second connecting shaft 2, thereby preventing the carrier block 411 from moving radially outward.

[0077] Example 3

[0078] Reference Figures 6-7 The only difference between this embodiment and Embodiment 1 is the installation structure of the elastic element 45, as detailed below:

[0079] The elastic element 45 is a tensile elastic element, and its two ends are respectively connected to two adjacent carrier blocks 411. The tensile force of the elastic element 45 drives the two adjacent carrier blocks 411 to move closer to each other. Since the carrier blocks 411 are slidably mounted on the second connecting shaft 2, they will be driven to move closer to the second connecting shaft 2, thereby hindering the radial outward movement of the carrier blocks 411.

[0080] The above three embodiments provide three different mounting structures for the elastic element 45. In other embodiments, the elastic element 45 can be a compression elastic element or a tension elastic element; the elastic element 45 can be adopted as follows: Figure 1 or Figure 5 or Figure 6 The detachable structure shown can be used for installation, but a non-detachable structure such as welding can also be used; the elastic element 45 can be used as... Figure 1 The adjustable-length structure shown can be used for installation, but a non-adjustable-length structure can also be used. Preferably, the elastic element 45 is detachable or adjustable in length, allowing its elastic force to be adjusted according to different motors, thereby adapting to motors of different speeds.

[0081] The above description focuses on the permanent magnet flexible connector as a soft starter. However, in practical applications, this permanent magnet flexible connector can also be used as a torque limiter. The specific principle is as follows:

[0082] First, connect the first connecting shaft 1 to the drive end, and connect the second connecting shaft 2 to the load end.

[0083] When the load end suddenly overloads and stalls, the carrier block 411 loses the centrifugal force and moves radially inward under the action of the elastic element 45. The permanent magnet 42 and the conductor ring 31 move away from each other, and the air gap between them increases until the permanent magnet 42 moves to the limit position furthest from the conductor ring 31. At this time, the eddy current coupling becomes weak coupling due to the increase in coupling distance, thereby cutting off the torque transmission between the motor and the load. After that, the motor is unloaded, and there is no torque or torque transmission in the load shaft system, thus realizing the torque limiting function and protecting the entire shaft system.

[0084] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A cylindrical self-adjusting air gap permanent magnet flexible connection device, characterized in that, include: First connecting shaft (1); The second connecting shaft (2) is coaxial with the first connecting shaft (1); The conductor rotor (3) includes a conductor ring (31) and a cylindrical conductor ring carrier (32), wherein the conductor ring carrier (32) is fixed relative to the first connecting shaft (1), and the conductor ring (31) is fixed to the inner wall of the conductor ring carrier (32); A permanent magnet rotor (4) is located between the conductor ring (31) and the second connecting shaft (2) and is coaxial with the conductor ring (31). The permanent magnet rotor (4) includes a permanent magnet carrier (41). The permanent magnet carrier (41) includes at least two carrier blocks (411) evenly distributed circumferentially along the second connecting shaft (2). The carrier blocks (411) are mounted on the second connecting shaft (2) and can slide radially along the second connecting shaft (2). A permanent magnet (42) is fixed on the surface of each carrier block (411) facing the conductor ring (31). Each carrier block (411) is connected to an elastic element (45) suitable for preventing its radial outward sliding. The second connecting shaft (2) is a hollow shaft corresponding to the shaft segment of the permanent magnet rotor (4), and the permanent magnet rotor (4) further includes: A guide rod (44) is fixed or integrally formed on the surface of the carrier block (411) facing the second connecting shaft (2) and arranged radially along the second connecting shaft (2). The guide rod (44) passes through the shaft wall of the second connecting shaft (2). A limiting member (46) is adapted to prevent the guide rod (44) from disengaging from the second connecting shaft (2), and the limiting member (46) is fixed or integrally formed on the inner end of the guide rod (44); The guide rod (44) has an external thread and a scale line at its inner end, and the limiting member (46) is a nut screwed onto the inner end of the guide rod (44); The hollow shaft has a stepped structure on the outer peripheral surface facing the carrier block (411).

2. The cylindrical self-adjusting air gap permanent magnet flexible connection device according to claim 1, characterized in that, The elastic element (45) is a compression elastic element. One end of the elastic element (45) abuts against the second connecting shaft (2), and the other end of the elastic element (45) abuts against the limiting element (46).

3. The cylindrical self-adjusting air gap permanent magnet flexible connection device according to claim 1, characterized in that, The second connecting shaft (2) is sealed at the end face near the first connecting shaft (1) and has a connecting part (221) protruding in the middle. The elastic element (45) is a tensile elastic element. One end of the elastic element (45) is connected to the carrier block (411), and the other end of the elastic element (45) is connected to the connecting part (221).

4. The cylindrical self-adjusting air gap permanent magnet flexible connection device according to claim 1, characterized in that, The elastic element (45) is a tensile elastic element, and the two ends of the elastic element (45) are respectively connected to two adjacent carrier blocks (411).

5. The cylindrical self-adjusting air gap permanent magnet flexible connection device according to any one of claims 1 to 4, characterized in that, The elastic element (45) is detachable or its length is adjustable.

6. The cylindrical self-adjusting air gap permanent magnet flexible connection device according to claim 1, characterized in that, The outer circumferential surface of the conductor ring carrier (32) is provided with heat dissipation teeth (321).

7. The cylindrical self-adjusting air gap permanent magnet flexible connection device according to claim 1, characterized in that, The permanent magnet rotor (4) also includes: A pressure plate (43) is fixed on the carrier block (411) and is adapted to press the permanent magnet (42) onto the carrier block (411).

8. The cylindrical self-adjusting air gap permanent magnet flexible connection device according to claim 1, characterized in that, The second connecting shaft (2) includes: Connecting shaft (21); The mounting shaft (22) is coaxially fixedly connected to the connecting shaft (21) and is suitable for mounting the permanent magnet rotor (4).

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