阅读说明：本技术 一种筒式自调节气隙永磁软连接装置 (Barrel type self-adjusting air gap permanent magnet flexible connection device ) 是由 杨可银 薛勇 徐俊峰 于 2021-09-16 设计创作，主要内容包括：本发明涉及机械传动技术领域,具体涉及一种筒式自调节气隙永磁软连接装置。包括：第一连接轴,适于连接负载；第二连接轴,适于连接驱动且与第一连接轴同轴；导体转子,包括导体环和筒状的导体环载体,导体环载体相对固定在第一连接轴上,导体环固定于导体环载体的内壁上；永磁转子,位于导体环与第二连接轴之间且与导体环同轴,永磁转子包括永磁体载体,永磁体载体包括沿第二连接轴周向均布的至少两个载体块,载体块安装在第二连接轴上且可沿第二连接轴的径向滑动,每个载体块朝向导体环的表面皆固定有永磁体,每个载体块皆连接有适于阻碍其径向向外滑动的弹性件。通过采用上述方案,启动时能实现气隙的自动调节,结构简单,重量轻,成本低。(The invention relates to the technical field of mechanical transmission, in particular to a cylindrical self-adjusting air gap permanent magnet flexible connection device. The method comprises the following steps: a first connecting shaft adapted to connect to a load; the second connecting shaft is suitable for being connected and driven and is coaxial with the first connecting shaft; the conductor rotor comprises a conductor ring and a cylindrical conductor ring carrier, wherein the conductor ring carrier is relatively fixed on the first connecting shaft, and the conductor ring is fixed on the inner wall of the conductor ring carrier; the permanent magnet rotor is positioned between the conductor ring and the second connecting shaft and is coaxial with the conductor ring, the permanent magnet rotor comprises permanent magnet carriers, the permanent magnet carriers comprise at least two carrier blocks which are uniformly distributed along the circumferential direction of the second connecting shaft, the carrier blocks are installed on the second connecting shaft and can slide along the radial direction of the second connecting shaft, a permanent magnet is fixed on the surface of each carrier block facing the conductor ring, and each carrier block is connected with an elastic piece which is suitable for blocking the conductor ring from sliding outwards in the radial direction. By adopting the 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.)

1. A cylinder type self-adjusting air gap permanent magnet flexible connection device is characterized by comprising:

a first connecting shaft (1);

a second connecting shaft (2) coaxial with the first connecting shaft (1);

a conductor rotor (3) including a conductor ring (31) and a cylindrical conductor ring carrier (32), the conductor ring carrier (32) being fixed to the first connecting shaft (1) in a relative manner, the conductor ring (31) being fixed to an inner wall of the conductor ring carrier (32);

the permanent magnet rotor (4) is located between the conductor ring (31) and the second connecting shaft (2) and coaxial with the conductor ring (31), the permanent magnet rotor (4) comprises permanent magnet carriers (41), each permanent magnet carrier (41) comprises at least two carrier blocks (411) which are uniformly distributed along the circumferential direction of the second connecting shaft (2), the carrier blocks (411) are installed on the second connecting shaft (2) and can slide along the radial direction of the second connecting shaft (2), each carrier block (411) faces to the surface of the conductor ring (31) and is fixedly provided with a permanent magnet (42), and each carrier block (411) is connected with an elastic piece (45) which is suitable for blocking the conductor ring from sliding outwards in the radial direction.

2. A flexible connection arrangement of the cartridge type self-adjusting air gap permanent magnet according to claim 1, characterized in that the second connection shaft (2) is provided as a hollow shaft corresponding to the shaft section of the permanent magnet rotor (4), and the permanent magnet rotor (4) further comprises:

a guide rod (44) fixed or integrally formed on the surface of the pellet block (411) facing the second connecting shaft (2) and arranged along the radial direction of the second connecting shaft (2), wherein the guide rod (44) penetrates through the shaft wall of the second connecting shaft (2);

the limiting piece (46) is suitable for preventing the guide rod (44) from being separated from the second connecting shaft (2), and the limiting piece (46) is fixed to or integrally formed at the inner end of the guide rod (44).

3. A flexible connection arrangement according to claim 2, characterized in that said elastic member (45) is a compression elastic member, one end of said elastic member (45) abuts against said second connection shaft (2) and the other end of said elastic member (45) abuts against said stop member (46).

4. A flexible connection device with a cylindrical self-adjusting air gap and permanent magnet according to claim 3, characterized in that the inner end of the guide rod (44) is externally threaded and provided with graduation marks, and the stop member (46) is a nut screwed onto the inner end of the guide rod (44).

5. A flexible connection device with a cylindrical self-adjusting air gap and permanent magnet according to claim 2, characterized in that the second connection shaft (2) is closed near the end face of the first connection shaft (1) and has a connection portion (221) protruding from the middle, the elastic member (45) is a tensile elastic member, one end of the elastic member (45) is connected to the carrier block (411), and the other end of the elastic member (45) is connected to the connection portion (221).

6. The flexible connection device with a cylindrical self-adjusting air gap permanent magnet as claimed in claim 2, wherein the elastic member (45) is a tensile elastic member, and two ends of the elastic member (45) are respectively connected to two adjacent carrier blocks (411).

7. A telescopic self-adjusting air gap permanent magnet soft connection device according to any of claims 1-3 or 5 or 6, wherein said resilient member (45) is detachably mounted or adjustable in length.

8. A flexible connection arrangement according to claim 1, characterized in that the conductor ring carrier (32) is provided with heat dissipating teeth (321) on its outer circumference.

9. A flexible connection arrangement of the cartridge type self-adjusting air gap permanent magnet according to claim 1, characterized in that the permanent magnet rotor (4) further comprises:

a pressing plate (43) fixed on the pellet block (411) and adapted to press the permanent magnet (42) on the pellet block (411).

10. A flexible connection arrangement of the cartridge type self-adjusting air gap permanent magnet according to claim 1, characterized in that the second connection shaft (2) comprises:

a connecting shaft (21);

and the mounting shaft (22) is coaxially and fixedly connected with the connecting shaft (21) and is suitable for mounting the permanent magnet rotor (4).

Technical Field

The invention relates to the technical field of permanent magnet couplers, in particular to a cylindrical self-adjusting air gap permanent magnet flexible connection device.

Background

In order to solve the problem of excessive starting torque, a fluid coupling or a soft starter is generally added between the motor and the load. The hydraulic coupler can delay the starting time of a motor and slow down the starting impact, but has the problems of low efficiency, oil leakage and large occupied space; the conventional soft starter can realize the soft start of the system, but all the conventional soft starters need a special control system, and have complex structures and inconvenient maintenance.

For this reason, permanent magnet couplers have been developed on the market specifically to solve the above-mentioned problems. The existing permanent magnet coupler mainly comprises a disc type permanent magnet coupler and a cylinder type permanent magnet coupler. A certain air gap is reserved between an induction rotor and a permanent magnet rotor of the disc type permanent magnet coupler in the axial direction; a certain air gap is reserved between the induction rotor and the permanent magnet rotor of the cylindrical permanent magnet coupler in the radial direction. The two types of permanent magnet couplers generate induced magnetic fields by means of magnetic induction lines generated by cutting magnetic steel in the permanent magnet rotor by conductors in the induction rotor, and the two groups of magnetic fields interact to transfer torque.

In order to improve the efficiency of the existing permanent magnet coupler, the slip ratio is generally not more than 4 percent, namely the slip under rated torque is not more than 60rpm, because if the slip ratio is higher, the conductor disc is heated seriously, and the efficiency is reduced. However, the lower slip ratio can cause the permanent magnet coupler to reach the rated torque at the moment of starting the motor, the system starting impact is larger, the motor can not drive the load to generate a 'stuffiness', or the motor exceeds the maximum torque instantly, and the motor runs at a high slip ratio all the time after passing through the optimal running slip rotation speed of the coupler, so the running efficiency is low, and the heating is serious; in addition, loads with large starting inertia may cause the motor to overload and fail to start. In order to solve the problems, an external actuating mechanism is additionally arranged on part of the permanent magnet coupler to adjust an air gap so as to realize adjustment of slip, but the structure is complex, the weight is heavy, the additional rotational inertia is increased, and the additional vibration factor of high-speed or high-power equipment is difficult to eliminate.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects of complex structure and heavy weight of the permanent magnet coupler with adjustable air gap in the prior art, so as to provide a disc type permanent magnet flexible connection device capable of automatically adjusting the air gap.

In order to solve the above technical problem, the present invention provides a cylindrical self-adjusting air gap permanent magnet flexible connection device, which comprises:

a first connecting shaft adapted to connect to a load;

the second connecting shaft is suitable for being connected and driven and is coaxial with the first connecting shaft;

a conductor rotor including a conductor ring and a cylindrical conductor ring carrier, the conductor ring carrier being fixed to the first connecting shaft, the conductor ring being fixed to an inner wall of the conductor ring carrier;

the permanent magnet rotor is positioned between the conductor ring and the second connecting shaft and is coaxial with the conductor ring, the permanent magnet rotor comprises permanent magnet carriers, the permanent magnet carriers comprise at least two carrier blocks which are uniformly distributed along the circumferential direction of the second connecting shaft, the carrier blocks are arranged on the second connecting shaft and can slide along the radial direction of the second connecting shaft, permanent magnets are fixed on the surfaces, facing the conductor ring, of the carrier blocks, and each carrier block is connected with an elastic piece which is suitable for blocking the carrier blocks from sliding outwards in the radial direction.

Optionally, the second connecting shaft is corresponding to the shaft section of the permanent magnet rotor and is set as a hollow shaft, and the permanent magnet rotor further comprises:

the guide rod is fixed or integrally formed on the surface, facing the second connecting shaft, of the carrier block and is arranged along the radial direction of the second connecting shaft, and the guide rod penetrates through the shaft wall of the second connecting shaft;

the limiting piece is suitable for blocking the guide rod from being separated from the second connecting shaft, and the limiting piece is fixed at the inner end of the guide rod or integrally formed at the inner end of the guide rod.

Optionally, the elastic member is a compression elastic member, one end of the elastic member abuts against the second connecting shaft, and the other end of the elastic member abuts against the limiting member.

Optionally, the inner end portion of the guide rod is provided with an external thread and scale marks, and the limiting member is a nut screwed on the inner end portion of the guide rod.

Optionally, the second connecting shaft is close to the end face seal of the first connecting shaft, the middle part of the second connecting shaft is convexly provided with a connecting part, the elastic part is a tensile elastic part, one end of the elastic part is connected with the carrier block, and the other end of the elastic part is connected with the connecting part.

Optionally, the elastic member is a tensile elastic member, and two ends of the elastic member are respectively connected to two adjacent pellet blocks.

Optionally, the elastic member is detachably mounted or adjustable in length.

Optionally, the conductor ring carrier is provided with heat dissipation teeth on its outer circumferential surface.

Optionally, the permanent magnet rotor further includes:

and the pressing plate is fixed on the pellet block and is suitable for pressing the permanent magnet on the pellet block.

Optionally, the second connecting shaft includes:

a connecting shaft;

and the mounting shaft is coaxially and fixedly connected with the connecting shaft and is suitable for mounting the permanent magnet rotor.

The technical scheme of the invention has the following advantages:

1. according to the cylindrical self-adjusting air gap permanent magnet flexible connection device, the carrier block is gradually moved outwards in the radial direction by utilizing the centrifugal force during rotation, so that the permanent magnet is gradually close to the conductor ring, the air gap is slowly reduced, the density of magnetic lines of force cut by the induction rotor is increased, the load torque is slowly increased, the maximum torque in a starting torque curve of the motor is utilized to drive the load to start, and therefore the no-load starting of the motor is realized, the starting current is small, the impact on the load is small, after the starting is finished, the slip during rated running is small, the efficiency is high, the slip heating of the body can be reduced, and the use safety and reliability are improved;

2. according to the cylindrical self-adjusting air gap permanent magnet flexible connection device provided by the invention, the permanent magnet carrier comprises at least two carrier blocks which are uniformly distributed along the circumferential direction, the automatic adjustment of the air gap in the starting process can be realized by arranging the carrier blocks in a sliding manner relative to the second connection shaft and matching with the elastic piece, and compared with the existing permanent magnet coupler with an external execution mechanism, the cylindrical self-adjusting air gap permanent magnet flexible connection device is low in production cost, simple in structure, lighter in weight, capable of reducing the load of the shaft, beneficial to enabling the product to be suitable for scenes with higher rotating speed and higher power, and beneficial to reducing vibration.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a permanent magnet soft connection device in an idle start state according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;

FIG. 3 is a schematic structural diagram illustrating a rated operation state of a permanent magnet soft connection device according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view taken at B-B of FIG. 3;

FIG. 5 is a schematic structural diagram according to a second embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a third embodiment of the present invention;

fig. 7 is a cross-sectional view at C-C in fig. 6.

Description of reference numerals:

1. a first connecting shaft; 2. a second connecting shaft; 21. a connecting shaft; 22. installing a shaft; 221. a connecting portion; 3. a conductor rotor; 31. a conductor ring; 32. a conductor ring carrier; 321. a heat dissipating tooth; 4. a permanent magnet rotor; 41. a permanent magnet carrier; 411. pellet block; 42. a permanent magnet; 43. pressing a plate; 44. a guide bar; 45. an elastic member; 46. and a limiting member.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example one

Referring to fig. 1 to 4, the present embodiment provides a cartridge type self-adjusting air gap permanent magnet flexible connection device, including:

a first connecting shaft 1 adapted to connect to a load;

the second connecting shaft 2 is suitable for connecting and driving and is coaxial with the first connecting shaft 1;

a conductor rotor 3 including a conductor ring 31 and a cylindrical conductor ring carrier 32, the conductor ring carrier 32 being fixed to the first connecting shaft 1, the conductor ring 31 being fixed to an inner wall of the conductor ring carrier 32; as is well known to those skilled in the art, the conductor ring carrier 32, the conductor ring 31 and the first connecting shaft 1 are coaxial; the cylindrical shape is a hollow columnar structure with two open ends; the "relative fixation" may be a direct fixation or an indirect fixation to the first connecting shaft 1 via a connecting member, preferably an indirect fixation, which can enlarge the diameter of the conductor ring 31 and provide more space for the installation of the permanent magnet rotor 4, such as shown in fig. 1; it should be noted that, if the conductor ring carrier 32 is indirectly fixed on the first connecting shaft 1 through the connecting member, and the conductor ring carrier 32 and the connecting member are integrally formed, the integral structure should also be considered as including the conductor ring carrier 32 in a cylindrical shape, only the connecting member is fixed on the conductor ring carrier 32 through the integrally formed manner, so that the structure also falls into the protection scope of the present application;

a permanent magnet rotor 4, which is located between the conductor ring 31 and the second connecting shaft 2 and is coaxial with the conductor ring 31, wherein the permanent magnet rotor 4 comprises a permanent magnet carrier 41, the permanent magnet carrier 41 comprises at least two carrier blocks 411 uniformly distributed along the circumferential direction of the second connecting shaft 2, the carrier blocks 411 are mounted on the second connecting shaft 2 and can slide along the radial direction of the second connecting shaft 2, a permanent magnet 42 is fixed on the surface of each carrier block 411 facing the conductor ring 31, and an elastic member 45 suitable for preventing the carrier blocks from sliding radially outwards is connected with each carrier block 411; the elastic member 45 may be a spring, an elastic string, or the like.

The cylindrical self-adjusting air gap permanent magnet flexible connecting device divides a permanent magnet carrier 41 into a plurality of carrier blocks 411 which are uniformly distributed along the circumferential direction, and each carrier block 411 can be radially and slidably mounted on a second connecting shaft 2 along the second connecting shaft 2 and is connected with an elastic piece 45 for blocking the radial outward movement of the second connecting shaft 2. When starting, the carrier block 411 is at the radially innermost 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 starting of a traditional motor; after starting, with the increase of the rotation speed of the second connecting shaft 2, the centrifugal force borne by the carrier block 411 slowly increases, when the centrifugal force is larger than the blocking force of the elastic member 45, the carrier block 411 moves outwards along the radial direction of the second connecting shaft 2, so that the air gap between the permanent magnet 42 and the conductor ring 31 is reduced, the slip is reduced, the magnetic induction is increased, the load torque is slowly increased, the carrier block 411 stops moving until moving to the outermost limit position in the radial direction, the optimal running gap is reached at this moment, the air gap is minimum in the state, the slip is minimum under the rated torque, the calorific value is minimum, and the efficiency is highest. The core invention of the application is that the structural foundation for realizing the adjustment of the air gap is not an externally-added executing mechanism, but the automatic adjustment is realized through the sliding arrangement of the load block 411 relative to the second connecting shaft 2 and the elastic piece 45, the cost is low, the structure is simple, the weight is low, the load of the shaft is reduced, and the product is suitable for scenes with higher rotating speed and higher power.

Referring to fig. 1, the present embodiment provides a preferred slide mounting structure of a carrier block 411: second connecting shaft 2 corresponds permanent magnet rotor 4's shaft part establishes to the hollow shaft, permanent magnet rotor 4 still includes:

a guide rod 44 fixed or integrally formed on the surface of the pellet block 411 facing the second connecting shaft 2 and arranged along the radial direction of the second connecting shaft 2, wherein the guide rod 44 penetrates through the shaft wall of the second connecting shaft 2;

the limiting member 46 is adapted to block the guide rod 44 from disengaging from the second connecting shaft 2, and the limiting member 46 is fixed to or integrally formed at the inner end of the guide rod 44.

In other embodiments, the guide rods 44 may be protruded on the outer peripheral surface of the second connecting shaft 2, and the pellet block 411 may be slidably mounted on the guide rods 44, or other common sliding structures.

Compared with other embodiments, the inward limit position of the pellet block 411 can be directly contacted with the second connecting shaft 2, the structure is compact, and the installation space is saved.

Referring to fig. 1-4, the present embodiment provides a preferred structure for the resilient member 45: the elastic member 45 is a compression elastic member, preferably a compression spring, one end of the elastic member 45 abuts against the second connecting shaft 2, and the other end of the elastic member 45 abuts against the limiting member 46; the stopper 46 may be a detachable component such as a nut, or may be a non-detachable component fixed by welding.

Preferably, the inner end of the guide rod 44 is externally threaded and provided with scale marks, and the limiting member 46 is a nut screwed on the inner end of the guide rod 44. The effects are three: firstly, the initial compression force of the elastic pieces 45 can be adjusted by matching the nuts with the scale marks, so that the compression force of each elastic piece 45 is kept consistent, and the nuts pre-tighten the elastic pieces 45; secondly, the elasticity of the elastic part 45 is adjusted through a nut so as to adapt to motors with different rotating speeds; thirdly, the permanent magnet 42 is controlled to radially move at a certain rotation speed to reach a normal operation air gap.

The structure needs fewer parts, and is simple and low in cost.

The present embodiment also provides an improved structure of the conductor ring carrier 32: the conductor ring carrier 32 is provided with heat dissipating teeth 321 on its outer circumferential surface. Since the permanent magnet 42 and the conductor ring 31 need to have a certain slip rotation speed during the driving process, slip loss occurs during the operation and heat is dissipated. By adopting such a 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 a plurality of annular teeth, so that the heat dissipation efficiency can be further improved.

The present embodiment further provides a preferable mounting structure of the permanent magnet 42, and the permanent magnet rotor 4 further includes:

and a pressing plate 43 fixed to the pellet block 411 and adapted to press the permanent magnet 42 against the pellet block 411.

Specifically, as shown in fig. 2, two permanent magnets 42 and three pressing plates 43 are disposed on each pellet block 411, the permanent magnets 42 and the pressing plates 43 are arranged at intervals, the pressing plates 43 are fixed on the pellet blocks 411 through bolts, the pressing plates 43 press the permanent magnets 42 through stepped surfaces, and the magnetic poles of the two permanent magnets 42 are opposite.

In other embodiments, the permanent magnet 42 may also be fixed on the carrier block 411 by other common structures, for example, a T-shaped slot is formed on the carrier block 411, the T-shaped slot is inverted, and then the permanent magnet 42 with a shape adapted to the T-shaped slot is inserted from the side; or a dovetail groove or the like may be used.

Referring to fig. 1, the present embodiment further provides a specific structure of the second connecting shaft 2, including:

a connecting shaft 21;

and the mounting shaft 22 is coaxially and fixedly connected with the connecting shaft 21 and is suitable for mounting the permanent magnet rotor 4.

Specifically, the weight of the mounting shaft 22 can be reduced by providing a multi-step structure on the outer peripheral surface of the mounting shaft 22 while ensuring the sliding length of the guide bar 44.

Through adopting above-mentioned structure, the internal installation space is enlarged to the internal diameter that is greater than connecting axle 21 of the internal diameter design of installation axle 22 to earlier install permanent magnet rotor 4 on installation axle 22 during the assembly, then integral erection is on second connecting axle 2 again, and the installation is also more convenient, easy.

In this embodiment, the conductor ring 31 is made of a material with high conductivity, such as aluminum (alloy), copper (alloy), or the like; the carrier conductor ring carrier 32 is made of a non-magnetic material and a material having a good heat dissipation property, such as aluminum (alloy); the permanent magnet 42 is made of rare earth permanent magnet material; the pressing plate 43 is made of non-magnetic conductive material such as stainless steel or aluminum (alloy); the pellet block 411 is made of a non-magnetic conductive material such as stainless steel or aluminum (alloy); the mounting shaft 22 may be made of a magnetically conductive material or a non-magnetically conductive material.

As a specific implementation form, the working process of the permanent magnet flexible connection device of the invention is as follows:

first, the second connecting shaft 2 is connected to the drive end, and the first connecting shaft 1 is connected to the load.

Referring to fig. 1 and 2, during start-up, the carrier block 411 is in the radially innermost limit position under the action of the elastic member 45, the air gap between the permanent magnet 42 and the conductor ring 31 is at a maximum, and start-up in this state corresponds to no-load start-up.

After the starting, along with the increase of the rotating speed of the second connecting shaft 2, the centrifugal force borne by the carrier block 411 is increased, and when the centrifugal force borne by the carrier block is greater than the elastic force action of the elastic piece 45, the carrier block 411 moves outwards along the guide rod 44, so that the air gap between the permanent magnet 42 and the conductor ring 31 is reduced, the torque is increased, and the load is driven to rotate.

The pellet block 411 is gradually moved radially outward by centrifugal force until it stops moving when it reaches a limit position, in which the air gap between the permanent magnet 42 and the conductor ring 31 is minimized, for which reason it is most efficient, as shown in fig. 3 and 4, which is the nominal operating state.

When the rotation speed of the second connecting shaft 2 is reduced during the shutdown, the centrifugal force applied to the pellet blocks 411 is not enough to overcome the elastic force of the elastic members 45, so that the pellet blocks 411 will slide inwards along the guide rods 44 until contacting the second connecting shaft 23, and at this time, the pellet blocks 411 will be restored to the state shown in fig. 1 and 2 under the action of the elastic members 45.

Example two

Referring to fig. 5, the present embodiment is different from the first embodiment only in the mounting structure of the elastic member 45, which is as follows:

the end face of the second connecting shaft 2 close to the first connecting shaft 1 is sealed, the middle part of the second connecting shaft is convexly provided with a connecting part 221, the elastic piece 45 is a tensile elastic piece, one end of the elastic piece 45 is connected with the pellet block 411, and the other end of the elastic piece 45 is connected with the connecting part 221. The tensile force of the resilient members 45 urges the pellet blocks 411 toward the second connecting axis 2, thereby resisting radially outward movement of the pellet blocks 411.

EXAMPLE III

Referring to fig. 6 to 7, the present embodiment differs from the first embodiment only in the mounting structure of the elastic member 45, which is as follows:

the elastic member 45 is a tensile elastic member, and both ends of the elastic member 45 are respectively connected to two adjacent pellet blocks 411. The tension of the resilient members 45 urges adjacent pellet blocks 411 toward each other, and since the pellet blocks 411 are slidably mounted on the second connecting shaft 2, the pellet blocks 411 are urged toward the second connecting shaft 2, thereby resisting radially outward movement of the pellet blocks 411.

The three embodiments described above show three different mounting structures for the elastic member 45, and in other embodiments, the elastic member 45 may be a compression elastic member or a tension elastic member; the elastic member 45 may be mounted by a detachable structure as shown in fig. 1, 5 or 6, or by a non-detachable structure such as welding; the elastic member 45 may be installed in a length-adjustable structure as shown in fig. 1, or in a length-non-adjustable structure. Preferably, the elastic member 45 is detachably mounted or adjustable in length, and the elastic force of the elastic member can be adjusted according to different motors, so that the elastic member is suitable for motors with different stages.

In the above, the permanent magnet flexible connector is used as a soft starter for related description, but in actual use, the permanent magnet flexible connector can also be used as a torque limiter, and the specific principle is as follows:

first, the first connecting shaft 1 is connected with the driving end, and the second connecting shaft 2 is connected with the load end.

When the load end is suddenly overloaded and locked, the carrier block 411 loses the centrifugal force effect, moves inwards along the radial direction under the action of the elastic piece 45, the permanent magnet 42 and the conductor ring 31 are far away from each other, the air gap between the permanent magnet 42 and the conductor ring 31 is increased until the permanent magnet 42 moves to the limit position farthest from the conductor ring 31, at the moment, the eddy current coupling is changed into weak coupling due to the increase of the coupling distance, so that the torque transmission between the motor and the load is cut off, the motor is unloaded, the load shafting has no torque or moment transmission, the moment limiting effect is realized, and the whole shafting is protected.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.