High-stability transmission mechanism of permanent magnet synchronous motor

Abstract

The invention discloses a high-stability transmission mechanism of a permanent magnet synchronous motor, and relates to the technical field of motor transmission mechanisms. Comprising a coupler A and a coupler B symmetrically arranged on one side of the coupler A, and further comprises a movable disc rotationally arranged on the surface of the coupler A in a sleeving mode through threads to rotate to generate thrust. The connecting rod is movably inserted into one side of the movable disc and moves along with rotation of the movable disc; the movable circular ring movably sleeves the surface of the coupling A and moves under the thrust of the connecting rod; the compression springs are fixed on one side of the coupler B at equal angles and deform under stress to change a transmission mode. Equipment can be switched according to different working conditions, performance and efficiency are considered, the equipment can flex and stretch to protect the equipment when needing flexibility (such as installation, start and stop and distress), the equipment can be fixed to guarantee precision when needing rigidity (such as stable high-speed operation), and therefore the equipment is multipurpose, longer in service life and better in performance.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of motor transmission mechanisms, in particular to a high-stability transmission mechanism of a permanent magnet synchronous motor. BACKGROUND

[0002] The permanent magnet synchronous motor is widely applied to industrial driving, rail transportation and new energy fields due to high efficiency, high power density and excellent control performance, however, the reliability and stability of the transmission system of the permanent magnet synchronous motor are largely dependent on the performance of a shaft coupling, and the shaft coupling is mainly divided into rigid and flexible types.

[0003] The rigid shaft coupling focuses on precision and torque, can realize synchronous rotation without slip and phase difference between input and output shafts, and does not have torsional vibration, movable parts, return gap and air gap error in reverse movement, but has no compensation capacity (radial / angular / axial) and is prone to generate huge additional stress, and requires high precision of the two shafts.

[0004] The flexible shaft coupling can compensate for axial, radial and angular deviation, tolerates certain installation errors and thermal deformation, can buffer and reduce vibration, reduces impact and noise, and protects bearings and seals, but all the flexible shaft couplings have limited torsional stiffness, are prone to have return gaps, affect positioning accuracy, and usually have lower torque transmission and transmission efficiency than the rigid shaft coupling of the same size.

[0005] The fact that only one of the two types can be selected means that the engineers must make a difficult choice of "this or that" in advance according to the main contradiction of the application, and the result is often "unsatisfactory at both ends", and many devices are obviously switched between different working conditions (installation, start and stop and running), and when the device needs to be frequently switched between the two types of working conditions and the shaft coupling mode cannot be switched, it is difficult to cover all working conditions without sacrificing efficiency or reliability, resulting in compromise of overall performance and increase of life cycle cost.

[0006] In view of the above problems, it is urgent to make an innovative design on the basis of the original high-stability transmission mechanism of the permanent magnet synchronous motor. SUMMARY

[0007] The technical scheme of the application provides a solution significantly different from the prior art, and specifically aims to provide a high-stability transmission mechanism of a permanent magnet synchronous motor to solve the problem that the flexible and rigid shaft couplings have advantages and disadvantages, many devices are obviously switched between different working conditions, but only one of the two types can be selected, which leads to difficulty in switching the use mode, compromise of overall performance and increase of life cycle cost.

[0008] In order to achieve the above object, the present application provides the following technical scheme: a high-stability transmission mechanism of a permanent magnet synchronous motor, comprising an A coupling and a B coupling symmetrically arranged on one side of the A coupling, further comprising: a moving disc rotatably sleeved on the surface of the A coupling and generating a thrust force through rotation; a connecting rod movably inserted on one side of the moving disc and displaced with the rotation of the moving disc; a moving ring movably sleeved on the surface of the A coupling and moved under the thrust force of the connecting rod; a compression spring fixed at equal angles on one side of the B coupling and deformed under stress to change the transmission mode.

[0009] Preferably, a fastening bolt is movably inserted on one side of the A coupling and the B coupling; a plurality of groups of the fastening bolt are arranged at equal angles.

[0010] Preferably, a diaphragm group is arranged in the middle of the A coupling and the B coupling, and a fastening bolt is movably inserted in the diaphragm group at equal angles; the diaphragm group is composed of a plurality of identical parts.

[0011] Preferably, a threaded groove is movably formed on the surface of the A coupling and the inner wall of the moving disc; a circular annular groove is formed on one side of the moving disc; the tooth angle and the thread of the two groups of threaded grooves are matched.

[0012] Preferably, a fixed ring is fixedly sleeved on the surface of the A coupling; a connecting rod is movably inserted through the surface of the fixed ring at equal angles.

[0013] Preferably, a square groove is formed at equal angles on the surface of the B coupling; the square groove is arranged through on one side close to the B coupling; a compression spring is movably arranged in the square groove.

[0014] Preferably, a circular groove is formed at equal angles on the surface of the diaphragm group; the diameter of the circular groove is greater than the diameter of the compression spring, and the circular groove is not in contact with the compression spring.

[0015] Preferably, a connecting block is fixed at equal angles on the inner wall of the moving ring; the connecting block is movably inserted in the square groove; the number of the connecting block is consistent with the number of the compression spring, and one side of the connecting block is fixedly connected with the compression spring.

[0016] Preferably, rubber pads are fixedly laid on both sides of the moving ring. A rubber pad is fixedly laid on one side of the connecting block.

[0017] Preferably, multiple sets of connecting rods are arranged at equal angles, and the multiple sets of connecting rods are composed of round rods and spheres; The round rod is fixed to one side of the movable ring, and the round rod is movably inserted into the fixed ring; The sphere is movably disposed in an annular groove on one side of the movable disk, and the sphere is movably inserted into the annular groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are: When a steady-state, high-precision operation is required, the moving disk is rotated clockwise. The continuous rotation of the moving disk pushes the connecting rod and the moving ring, at which point the connecting block is pushed to compress the compression springs. As a result, multiple sets of compression springs are compressed into a "dense spiral" state, all the spring coils are in close contact with each other, and there are no gaps between adjacent coils, forming a "solid height" metal column. Switching to rigid mode can provide higher torsional stiffness, lower backlash, and higher transmission efficiency, which is beneficial for accuracy and dynamic response, as well as high-precision positioning and stable control.

[0019] During start-up, shutdown, impact loads, or installation and thermal deformation, the moving disc rotates counterclockwise. This causes the moving disc to move the connecting rod and the moving ring in the opposite direction, so that the connecting block no longer compresses the compression spring to the right. The compression spring then regains its elasticity and switches to flexible mode to buffer vibration, compensate for axial / radial / angular offset, reduce transient overload and wear of bearings and seals, and assume part of the buffering and vibration reduction function. This can reduce the fatigue and failure probability of key components, extend the life of bearings and seals, and reduce maintenance frequency and cost.

[0020] It can switch between different working conditions according to the equipment, taking into account both performance and efficiency. When the equipment needs to be "flexible" (such as during installation, start-up, or emergency) it can bend and stretch to protect itself, and when it needs to be "rigid" (such as during stable high-speed operation) it can remain steadfast to ensure accuracy. This achieves multi-purpose functionality, longer lifespan, and better performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention.

[0022] Figure 2 This is a three-dimensional exploded view of the structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the second three-dimensional structure of the present invention.

[0024] Figure 4 This is a schematic diagram of the connecting rod and connecting block of the present invention.

[0025] Figure 5 This is a front view of the structure of the present invention after it has been cut open.

[0026] Figure 6 This is a schematic diagram of the square groove structure of the present invention.

[0027] Figure 7 This is a schematic diagram of the compression spring of the present invention.

[0028] Figure 8 This is a schematic diagram of the structure of the diaphragm assembly of the present invention.

[0029] Figure 9 This is a schematic diagram of the structure of the present invention in use.

[0030] In the diagram: 1. Coupling A; 2. Coupling B; 3. Moving disc; 4. Diaphragm assembly; 5. Fastening bolt; 6. Compression spring; 7. Fixed ring; 8. Moving ring; 9. Connecting rod; 10. Connecting block; 11. Square groove; 12. Threaded groove. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0032] Please see Figures 1 to 9 The present invention provides a technical solution: a highly stable transmission mechanism for a permanent magnet synchronous motor, comprising an A coupling 1 and a B coupling 2 symmetrically located on one side of the A coupling 1, and further comprising: The moving disc 3, which is screwed onto the surface of coupling A 1, generates thrust by rotating; A connecting rod 9 is movably inserted on one side of the movable disc 3 and moves with its rotation; A movable ring 8 that is fitted onto the surface of coupling A 1 and moves under the thrust of connecting rod 9; A compression spring 6, which is fixed at an equal angle to one side of coupling 2 of B, changes the transmission mode by deforming under force.

[0033] In practice, fastening bolts 5 are movably inserted on one side of coupling A 1 and coupling B 2. There are multiple sets of fastening bolts at equal angles.

[0034] Additionally, it should be noted that during installation, the fastening bolt 5 is a key component of the main force transmission path, reliably transmitting the torque from the active end to the driven end through the diaphragm assembly 4. At the same time, it works with the nut to apply axial preload to the diaphragm stack, keeping the diaphragm in a controlled preload state and ensuring connection rigidity and stability.

[0035] In specific implementation, a diaphragm assembly 4 is provided between coupling A 1 and coupling B 2, and a fastening bolt 5 is inserted into the diaphragm assembly 4 at a moderate angle. Membrane group 4 consists of multiple identical parts.

[0036] In specific implementation, threaded grooves 12 are movably opened on the surface of coupling A 1 and the inner wall of movable disk 3 respectively; A circular groove is provided on one side of the movable disc 3; The tooth angles of the two sets of thread grooves 12 are compatible with the threads.

[0037] Additionally, it should be noted that when coupling A 1 and the movable disk 3 rotate to the end, that is, when they are rotated to both ends, they can achieve self-locking. The thread groove 12 adopts a larger tooth profile angle, which enables the thread to generate a larger normal reaction force between the tooth sides when under force, thereby increasing the friction and facilitating self-locking. At the same time, the thread groove 12 has a smaller pitch, which can ensure the stability of the position after adjustment.

[0038] In specific implementation, a fixing ring 7 is fixedly sleeved on the surface of coupling A 1; A connecting rod 9 is inserted through the surface of the fixed ring 7 at equal angles.

[0039] Additionally, it should be noted that the fixed ring 7 limits the direction of movement of the connecting rod 9 and the movable ring 8, allowing the movable ring 8 and the connecting rod 9 to move horizontally left and right, which in turn drives the connecting block 10 to move horizontally left and right. This enables the compression spring 6 to be pushed horizontally at all times, allowing the compression spring 6 to be squeezed into a "dense spiral" state, thus achieving the switching of the transmission mode.

[0040] In specific implementation, square grooves 11 are opened at equal angles on the surface of coupling B 2; The square groove 11 is provided through one side near the B coupling 2; A compression spring 6 is movably installed in the square groove 11.

[0041] In addition, it should be noted that by rotating the movable disc 3, the displacement of the movable ring 8 can be achieved to compress and reset the compression spring 6, making the operation simpler and the switching of transmission modes more convenient and quicker.

[0042] In specific implementation, circular grooves are formed at equal angles on the surface of diaphragm group 4; The diameter of the circular groove is larger than the diameter of the compression spring 6, and the circular groove and the compression spring 6 do not contact each other.

[0043] Additionally, it should be noted that the diameter of the compression spring 6 increases when it is compressed, so that the compression spring 6 does not contact the diaphragm assembly 4 even at its maximum diameter, thus maintaining the good performance of the diaphragm assembly 4.

[0044] In practice, the inner wall of the movable ring 8 is fixed with connecting blocks 10 at equal angles; The connecting block 10 is movably inserted into the square groove 11; Additionally, it should be noted that the design of the square groove 11 allows the connecting block 10 to move smoothly, changing the adjustment of the transmission mode, and also provides the space required for the compression spring 6 to rebound, thus releasing the rigid connection between coupling A 1 and coupling B 2.

[0045] The number of connecting blocks 10 is the same as that of compression springs 6, and the connecting blocks 10 are fixedly connected to one side of the compression springs 6.

[0046] Additionally, it should be noted that when the connecting block 10 moves, it can compress the compression spring 6 into a metal cylinder, and also allow the compression spring 6 to regain its elasticity. The combination of these two mechanisms is suitable for different application scenarios.

[0047] In practice, rubber pads are fixedly laid on both sides of the movable ring 8; A rubber pad is fixedly laid on one side of the connecting block 10.

[0048] In addition, it should be noted that rubber material has a certain degree of elasticity and good friction, which can convert impact and torsional vibration energy into heat energy, significantly reducing the vibration and noise of the transmission system, protecting the surface of the components, and extending their service life.

[0049] In practice, multiple sets of connecting rods 9 are set at equal angles, and the multiple sets of connecting rods 9 are composed of round rods and round balls; The round rod is fixed to one side of the movable ring 8, and the round rod is movably connected to the fixed ring 7; The sphere is movably positioned in an annular groove on one side of the movable disk 3, and the sphere is movably inserted into the annular groove.

[0050] Additionally, it should be noted that as the movable disc 3 rotates, the connecting rod 9 continuously rotates and moves within the annular groove of the movable disc 3, being driven by the movable disc 3 to move left and right continuously, and will not fall out of the annular groove of the movable disc 3.

[0051] Working principle: When using the high-stability transmission mechanism of this permanent magnet synchronous motor, first clean and inspect all components. With the couplings completely disassembled, install the two half-couplings, A coupling 1 and B coupling 2, onto the motor shaft and equipment shaft respectively. Initially connect the two half-couplings already installed on the shafts with bolts. Do not tighten the bolts too much; fine adjustments can be made later. Adjust the installation accuracy according to the situation. Once the alignment accuracy meets the standard, use a torque wrench to tighten the motor's foundation bolts according to the specified torque and sequence. When it is necessary to adjust to the rigid mode, hold the movable disc 3 on the surface of coupling A 1 and rotate it clockwise. As the movable disc 3 rotates, it moves closer to the diaphragm group 4, pushing the connecting rod 9 and the movable ring 8 to move. As the movable ring 8 moves, it causes the connecting block 10 to slide in the square groove 11, compressing multiple sets of compression springs 6. The multiple sets of compression springs 6 are compressed into the "dense spiral" state, and all the coils of the compression springs 6 will be in close contact with each other. There are no gaps between adjacent coils, forming a "solid height" metal column. At this time, coupling A 1 and coupling B 2 are directly connected by the compression springs 6, thus switching coupling A 1 and coupling B 2 to the rigid mode. When it is necessary to adjust to the flexible mode, similarly, hold the moving disc 3 in the opposite direction and rotate it counterclockwise. This causes the moving disc 3 to move the connecting rod 9 away from the diaphragm group 4. The movement of the connecting rod 9 causes the moving ring 8 and the connecting block 10 to move simultaneously. As the connecting block 10 moves continuously, the compression spring 6 gradually recovers its elasticity and switches to the flexible mode. The compression spring 6 can buffer and dampen shocks and compensate for offset during transmission. When using the equipment, the usage mode can be adjusted according to the usage scenario and different stages of the equipment.

[0052] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A highly stable transmission mechanism for a permanent magnet synchronous motor, comprising an A coupling (1) and a B coupling (2) symmetrically located on one side of the A coupling (1), characterized in that, Also includes: The moving disc (3) rotates on the surface of coupling A (1) by rotating through the thread to generate thrust. A connecting rod (9) is movably inserted on one side of the movable disc (3) and moves with it as it rotates; The movable ring (8) is mounted on the surface of coupling A (1) and moves under the thrust of connecting rod (9); A compression spring (6) is fixed at an equal angle to one side of coupling B (2) and deforms under force to change the transmission mode.

2. The high-stability transmission mechanism for a permanent magnet synchronous motor according to claim 1, characterized in that: The fastening bolt (5) is movably inserted on one side of both coupling A (1) and coupling B (2). The fastening bolts (5) are arranged in multiple sets at equal angles.

3. The high-stability transmission mechanism for a permanent magnet synchronous motor according to claim 1, characterized in that: A diaphragm assembly (4) is provided between the A coupling (1) and the B coupling (2), and a fastening bolt (5) is inserted into the diaphragm assembly (4) at a medium angle. The diaphragm assembly (4) consists of multiple identical parts.

4. The high-stability transmission mechanism for a permanent magnet synchronous motor according to claim 1, characterized in that: The surface of the A coupling (1) and the inner wall of the movable disk (3) are respectively provided with threaded grooves (12). A circular groove is provided on one side of the movable disk (3); The tooth angle and thread of the two sets of thread grooves (12) are compatible.

5. The high-stability transmission mechanism for a permanent magnet synchronous motor according to claim 1, characterized in that: The surface of the A coupling (1) is fixedly fitted with a fixing ring (7); The surface of the fixed ring (7) is flexibly inserted with a connecting rod (9) at equal angles.

6. The high-stability transmission mechanism for a permanent magnet synchronous motor according to claim 1, characterized in that: The surface of the B coupling (2) is provided with square grooves (11) at equal angles. The square groove (11) is provided through one side near the B coupling (2); A compression spring (6) is movably disposed in the square groove (11).

7. The high-stability transmission mechanism for a permanent magnet synchronous motor according to claim 3, characterized in that: The surface of the diaphragm assembly (4) is provided with circular grooves at equal angles; The diameter of the circular groove is larger than the diameter of the compression spring (6), and the circular groove does not contact the compression spring (6).

8. The high-stability transmission mechanism for a permanent magnet synchronous motor according to claim 1, characterized in that: The inner wall of the movable ring (8) is fixed with connecting blocks (10) at equal angles. The connecting block (10) is movably inserted into the square groove (11); The number of connecting blocks (10) is the same as that of compression springs (6), and the connecting blocks (10) are fixedly connected to one side of the compression springs (6).

9. A high-stability transmission mechanism for a permanent magnet synchronous motor according to claim 8, characterized in that: Rubber pads are fixedly laid on both sides of the movable ring (8); A rubber pad is fixedly laid on one side of the connecting block (10).

10. A high-stability transmission mechanism for a permanent magnet synchronous motor according to claim 1, characterized in that: The connecting rods (9) are arranged in multiple sets at equal angles, and the multiple sets of connecting rods (9) are composed of round rods and spheres; The round rod is fixed to one side of the movable ring (8), and the round rod is movably inserted into the fixed ring (7); The sphere is movably disposed in an annular groove on one side of the movable disk (3), and the sphere is movably inserted into the annular groove.

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