High-stability transmission mechanism of permanent magnet synchronous motor

Abstract

The application discloses a high-stability transmission mechanism of a permanent magnet synchronous motor and relates to the technical field of motor transmission mechanisms. The high-stability transmission mechanism comprises an A shaft coupling and a B shaft coupling which is symmetrically arranged on the side of the A shaft coupling, and further comprises a moving disc which is sleeved on the surface of the A shaft coupling through thread rotation and generates a pushing force through rotation; a connecting rod which is movably inserted on the side of the moving disc and is displaced along with the rotation of the moving disc; a moving ring which is movably sleeved on the surface of the A shaft coupling and is displaced under the pushing force of the connecting rod; and a compression spring which is fixed on the side of the B shaft coupling at equal angles, is deformed under stress and changes the transmission mode. The application can switch the equipment according to different working conditions, takes into account the performance and efficiency, enables the equipment to bend and stretch to protect itself when the equipment needs to be flexible (such as installation, start and stop and in distress), and enables the equipment to be firm and unswerving to ensure accuracy when the equipment needs to be rigid (such as stable high-speed operation), so that the equipment can be used in multiple ways, has a longer service life and performs better.

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 cannot cause torsional vibration, has no movable part, has no back lash, has no back lash error during reverse movement, but has no compensation capacity (radial / angular / axial), and is prone to cause huge additional stress, and is extremely high in requirements for the alignment precision of the two shafts.

[0004] The flexible shaft coupling can compensate for axial, radial and angular deviation, tolerates certain installation error 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 back lash, affect positioning precision, and are generally lower in torque transmission than rigid shaft couplings of the same size and slightly lower in transmission efficiency.

[0005] The fact that only one of the two types can be selected means that an engineer 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 (during 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 respective advantages and disadvantages, many devices are obviously switched between different working conditions, but only one of the two types can be selected, which is difficult to switch the use mode, resulting in compromise of overall performance and increase of life cycle cost.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a highly stable transmission mechanism for a permanent magnet synchronous motor, comprising a coupling A and a coupling B symmetrically located on one side of coupling A, and further comprising:

[0009] A movable disc that rotates on the surface of coupling A via a threaded rotation generates thrust.

[0010] A connecting rod that is movably inserted on one side of a movable disc and moves with its rotation;

[0011] A movable ring that is fitted onto the surface of coupling A and moves under the thrust of the connecting rod;

[0012] A compression spring that is fixed at an equal angle to one side of coupling B and changes the transmission mode by deforming under force.

[0013] Preferably, a fastening bolt is movably inserted on one side of both coupling A and coupling B;

[0014] The fastening bolts are arranged in multiple sets at equal angles.

[0015] Preferably, a diaphragm assembly is provided between the A coupling and the B coupling, and a fastening bolt is inserted into the diaphragm assembly at a moderate angle.

[0016] The diaphragm assembly consists of multiple identical parts.

[0017] Preferably, threaded grooves are movably provided on the surface of the A coupling and the inner wall of the movable disc, respectively;

[0018] A circular groove is provided on one side of the movable disk;

[0019] The tooth angle and thread of the two sets of thread grooves are compatible.

[0020] Preferably, a fixing ring is fixedly sleeved on the surface of the A coupling;

[0021] A connecting rod is inserted through the surface of the fixed ring at equal angles.

[0022] Preferably, the surface of the B coupling is provided with square grooves at equal angles;

[0023] The square groove is provided through the side near the B coupling.

[0024] A compression spring is movably disposed in the square groove.

[0025] Preferably, the surface of the diaphragm assembly has circular grooves formed at equal angles;

[0026] The diameter of the circular groove is larger than the diameter of the compression spring, and the circular groove does not contact the compression spring.

[0027] Preferably, the inner wall of the moving ring is equiangularly fixed with a connecting block;

[0028] The connecting block is movably inserted in the square groove;

[0029] The number of the connecting block is consistent with that of the compression spring, and one side of the connecting block is fixedly connected with the compression spring.

[0030] Preferably, rubber pads are fixedly laid on the two sides of the moving ring;

[0031] One side of the connecting block is fixedly laid with a rubber pad.

[0032] Preferably, a plurality of groups of the connecting rods are equiangularly arranged, and the plurality of groups of the connecting rods are composed of round rods and round balls;

[0033] The round rod is fixed on one side of the moving ring, and the round rod is movably and insertingly connected with the fixed ring;

[0034] The round ball is movably arranged in the annular groove on one side of the moving disc, and the round ball is movably and insertingly connected with the annular groove.

[0035] Compared with the prior art, the present application has the following beneficial effects:

[0036] When a steady high-precision operation stage is needed, the moving disc is rotated clockwise, the moving disc is continuously rotated and pushed to move the connecting rod and the moving ring, at this time, the connecting block is pushed to extrude the compression spring, so that a plurality of groups of the compression spring are extruded into a "dense spiral" state, all spring coils are closely contacted together, there is no gap between adjacent coils to become a "solid height" metal column, and the mode is switched to a rigid mode, higher torsional stiffness, lower gap and higher transmission efficiency can be provided, which is beneficial to precision and dynamic response, and is beneficial to high-precision positioning and stable control.

[0037] When starting and stopping, impact load or installation and thermal deformation exist, the moving disc is counterclockwise, at this time, the moving disc drives the connecting rod and the moving ring to move reversely, so that the connecting block no longer extrudes the compression spring to the right, the compression spring restores elasticity, and the mode is switched to a flexible mode to buffer and reduce vibration, compensate for axial / radial / angle deviation, reduce transient overload and wear of bearings and seals, bear part of the buffering and damping function, reduce the fatigue and failure probability of key components, prolong the service life of bearings and seals, and reduce the maintenance frequency and cost.

[0038] The device can be switched between different working conditions according to the device, the performance and efficiency are considered, the device can bend and stretch to protect itself when it needs to be "flexible" (such as installation, starting and stopping, and encountering danger), and it can be firm and unswerving when it needs to be "rigid" (such as stable high-speed operation), so as to realize one machine with multiple functions, longer service life and better performance. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is the first perspective structural schematic diagram of the present application.

[0040] Figure 2 It is the perspective exploded schematic diagram of the structure of the present application.

[0041] Figure 3 It is the second perspective structural schematic diagram of the present application.

[0042] Figure 4 It is the structural schematic diagram of the connecting rod and the connecting block of the present application.

[0043] Figure 5 It is the schematic diagram of the structure of the present application after being cut open.

[0044] Figure 6 It is the structural schematic diagram of the square recess of the present application.

[0045] Figure 7 It is the structural schematic diagram of the compression spring of the present application.

[0046] Figure 8 It is the structural schematic diagram of the diaphragm group of the present application.

[0047] Figure 9 It is the schematic diagram of the structure of the present application in use.

[0048] In the figure: 1, A coupling; 2, B coupling; 3, moving disc; 4, diaphragm group; 5, fastening bolt; 6, compression spring; 7, fixed ring; 8, moving ring; 9, connecting rod; 10, connecting block; 11, square recess; 12, threaded groove. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0050] Please refer to Figures 1 to 9 The present application provides a technical solution: a high-stability transmission mechanism of a permanent magnet synchronous motor, which comprises an A coupling 1 and a B coupling 2 symmetrically arranged on one side of the A coupling 1, and further comprises:

[0051] A moving disc 3 is sleeved on the surface of the A coupling 1 and rotates to generate a pushing force;

[0052] A connecting rod 9 is movably inserted on one side of the moving disc 3 and displaced with the rotation of the moving disc 3;

[0053] A movable ring 8 that is fitted onto the surface of coupling A 1 and moves under the thrust of connecting rod 9;

[0054] 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.

[0055] In practice, fastening bolts 5 are movably inserted on one side of coupling A 1 and coupling B 2.

[0056] There are multiple sets of fastening bolts at equal angles.

[0057] 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.

[0058] 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.

[0059] Membrane group 4 consists of multiple identical parts.

[0060] 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;

[0061] A circular groove is provided on one side of the movable disc 3;

[0062] The tooth angles of the two sets of thread grooves 12 are compatible with the threads.

[0063] 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.

[0064] In specific implementation, a fixing ring 7 is fixedly sleeved on the surface of coupling A 1;

[0065] A connecting rod 9 is inserted through the surface of the fixed ring 7 at equal angles.

[0066] 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.

[0067] In specific implementation, square grooves 11 are equiangularly arranged on the surface of B coupling 2;

[0068] The square grooves 11 are arranged through the side close to B coupling 2;

[0069] The square grooves 11 movably arrange compression springs 6.

[0070] In addition, it needs to be explained that the displacement of moving disc 3 is pushed by rotating moving disc 3, so as to realize the extrusion and reset of compression spring 6, so that the operation is more simple, and it is more convenient and fast when the transmission mode needs to be switched.

[0071] In specific implementation, circular grooves are equiangularly arranged on the surface of diaphragm group 4;

[0072] The diameter of the circular groove is greater than the diameter of the compression spring 6, and the circular groove is not in contact with the compression spring 6.

[0073] In addition, it needs to be explained that the diameter of the compression spring 6 is increased in the extruded state, so that the compression spring 6 does not contact the diaphragm group 4 at the maximum diameter, and the performance of the diaphragm group 4 is maintained.

[0074] In specific implementation, connecting blocks 10 are equiangularly arranged on the inner wall of moving ring 8;

[0075] The connecting blocks 10 are movably arranged in the square grooves 11;

[0076] In addition, it needs to be explained that the design of square groove 11 allows the connecting block 10 to be smoothly moved, changes the adjustment of the transmission mode, and also provides the space required for the rebound of compression spring 6, so that the rigid connection state between A coupling 1 and B coupling 2 is released.

[0077] The number of connecting blocks 10 is consistent with the number of compression springs 6, and one side of the connecting block 10 is fixedly connected with the compression spring 6.

[0078] In addition, it needs to be explained that the connecting block 10 extrudes the compression spring 6 into a metal column when moving, and also allows the compression spring 6 to recover elasticity, and the two cooperate with each other to adapt to different use scenarios.

[0079] In specific implementation, rubber pads are fixedly arranged on both sides of moving ring 8;

[0080] The side of the connecting block 10 is fixedly arranged with a rubber pad.

[0081] In addition, it needs to be explained that the rubber material has certain elasticity and good friction, can convert impact and torsional vibration energy into heat energy, significantly reduce the vibration and noise of the transmission system, and also protect the surface of the parts and prolong the service life.

[0082] In the embodiment, the connecting rods 9 are arranged at equal angles and are composed of round rods and round balls;

[0083] The round rods are fixed on one side of the moving ring 8 and are movably inserted and connected with the fixed ring 7.

[0084] The round balls are movably arranged in the circular grooves on one side of the moving disc 3 and are movably inserted and connected with the circular grooves.

[0085] In addition, it should be noted that with the rotation of the moving disc 3, the connecting rods 9 are continuously rotated and moved in the circular grooves of the moving disc 3 and are continuously moved left and right driven by the moving disc 3 and will not fall off from the circular grooves of the moving disc 3.

[0086] Working principle: when using the high-stability transmission mechanism of the permanent magnet synchronous motor, first clean and inspect all parts, install the two half-couplings of the A coupling 1 and the B coupling 2 to the motor shaft and the equipment shaft respectively in the state that the couplings are completely disassembled, preliminarily connect the two half-couplings already installed on the shafts with bolts, the bolts should not be tightened too tightly, and fine adjustment can be performed later, adjust the installation accuracy according to the situation, and when the centering accuracy meets the standard, use a torque wrench to tighten the motor foot bolts according to the specified torque and sequence.

[0087] When it is necessary to adjust to the rigid mode, hold the moving disc 3 on the surface of the A coupling 1 and rotate it clockwise, continuously move the connecting rods 9 and the moving ring 8 towards the diaphragm group 4 with the rotation of the moving disc 3, push the connecting rods 9 and the moving ring 8 to move, slide the connecting block 10 in the square groove 11 with the movement of the moving ring 8, extrude the plurality of compression springs 6, and the plurality of compression springs 6 are extruded into the "dense spiral" state, all the turns of the compression spring 6 are in close contact and there is no gap between adjacent turns to form a "solid height" metal column, at this time, the A coupling 1 and the B coupling 2 are directly connected by the compression spring 6, so that the A coupling 1 and the B coupling 2 are switched to the rigid mode.

[0088] When it is necessary to adjust to the flexible mode, hold the moving disc 3 counterclockwise in the opposite direction, so that the moving disc 3 drives the connecting rods 9 to move away from the diaphragm group 4, the connecting rods 9 drive the moving ring 8 and the connecting block 10 to move at the same time, and with the continuous movement of the connecting block 10, the compression spring 6 gradually recovers elasticity and switches to the flexible mode, the compression spring 6 can buffer and compensate for deviation during transmission, and the use mode can be adjusted according to different stages of use of the equipment.

[0089] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-stability transmission mechanism of a permanent magnet synchronous motor, comprising an A coupling (1) and a B coupling (2) symmetric to one side of the A coupling (1), characterized in that, Also includes: The moving disc (3) is sleeved on the surface of the A shaft (1) and generates thrust by rotating; The connecting rod (9) is movably inserted on one side of the moving disc (3) and moves with it; The moving ring (8) is movably sleeved on the surface of the A shaft (1) and moves under the thrust of the connecting rod (9); The compression spring (6) is fixed at an equal angle on one side of the B shaft (2) and changes the transmission mode by being deformed under stress.

2. The high-stability transmission mechanism of the permanent magnet synchronous motor according to claim 1, wherein: one side of the A shaft (1) and the B shaft (2) movably inserts a fastening bolt (5) together; The fastening bolt (5) is provided with multiple groups at an equal angle.

3. The high-stability transmission mechanism of the permanent magnet synchronous motor according to claim 1, wherein: a diaphragm group (4) is arranged in the middle of the A shaft (1) and the B shaft (2), and the diaphragm group (4) movably inserts a fastening bolt (5) at an equal angle; The diaphragm group (4) is composed of multiple identical parts.

4. The high-stability transmission mechanism of the permanent magnet synchronous motor according to claim 1, wherein: the surface of the A shaft (1) and the inner wall of the moving disc (3) movably open a thread groove (12) respectively; One side of the moving disc (3) is provided with a circular recess; The thread angle and thread of the two groups of thread grooves (12) are matched.

5. The high-stability transmission mechanism of the permanent magnet synchronous motor according to claim 1, wherein: the surface of the A shaft (1) movably sleeves a fixed ring (7); The surface of the fixed ring (7) movably penetrates and inserts a connecting rod (9) at an equal angle.

6. The high-stability transmission mechanism of the permanent magnet synchronous motor according to claim 1, wherein: The surface of the B shaft (2) movably opens a square recess (11) at an equal angle; The square recess (11) is arranged near one side of the B shaft (2); The square recess (11) movably arranges a compression spring (6).

7. The high-stability transmission mechanism of the permanent magnet synchronous motor according to claim 3, wherein: The surface of the diaphragm group (4) movably opens a circular recess at an equal angle; The diameter of the circular recess is larger than the diameter of the compression spring (6), and the circular recess and the compression spring (6) are not in contact.

8. The high-stability transmission mechanism of the permanent magnet synchronous motor according to claim 1, wherein: The inner wall of the moving ring (8) movably inserts a connecting block (10) at an equal angle; The connecting block (10) is movably inserted in the square recess (11); The number of the connecting block (10) is consistent with the number of the compression spring (6), and one side of the connecting block (10) is fixedly connected with the compression spring (6).

9. The high-stability transmission mechanism of the permanent magnet synchronous motor according to claim 8, wherein: The two sides of the moving ring (8) are respectively fixedly laid with rubber pads; One side of the connecting block (10) is fixedly laid with a rubber pad.

10. The high-stability transmission mechanism of the permanent magnet synchronous motor according to claim 1, wherein: ​ ​ ​ ​ The connecting rods (9) are equiangularly arranged in multiple groups, and the multiple groups of connecting rods (9) are composed of round rods and round balls; The round rods are fixed on one side of the moving circular ring (8), and the round rods are movably and insertingly connected with the fixed circular ring (7); The round balls are movably arranged in the circular groove on one side of the moving disc (3), and the round balls are movably and insertingly connected with the circular groove.

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