A rotor coupling based on a permanent magnet synchronous motor

Abstract

The application discloses a rotor coupling based on a permanent magnet synchronous motor and relates to the technical field of couplings. The locking assembly is arranged in a first half shaft sleeve in an equal proportion and is driven by centrifugal force generated by high-speed rotation of the first half shaft sleeve to protect a motor rotating shaft. In the application, the coaxial and stable rotation of the rotor and the load shaft can be effectively maintained during the operation of the load equipment. If the equipment is overloaded in an extreme case, the equipment will shake, the second half shaft sleeve will be shaken, the inserted rod will be forcibly broken, and then the vibration force will be buffered by the deformation of the diaphragm, so that the motor and the load equipment are protected. The application retains the protection of the traditional single-diaphragm coupling for the motor rotor and the load shaft in an extreme case, reduces the possibility of unnecessary shaking of the traditional single-diaphragm coupling during the normal operation of the equipment, and is more in line with the operation requirements of the load equipment.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of couplings, in particular to a rotor coupling based on a permanent magnet synchronous motor. BACKGROUND

[0002] The permanent magnet synchronous motor is an alternating current motor that utilizes a permanent magnet to generate a rotor magnetic field, a stator winding to generate a rotating magnetic field, and electromagnetic interaction to realize synchronous rotation of the rotor and the stator rotating magnetic field. At present, the permanent magnet synchronous motor is a core driving component in the fields of new energy vehicles, industrial precision driving, and high-end equipment, and needs to transmit power to a load through a transmission system. The coupling, as a key intermediate component connecting the motor rotor and the load shaft, directly affects the power transmission efficiency, operation stability, and service life of the entire driving system.

[0003] There are various types of couplings on the market. Among them, the diaphragm coupling becomes the preferred solution for realizing efficient and stable power transmission in scenes such as permanent magnet synchronous motor driving systems due to its wear resistance, fatigue resistance, and high precision. The diaphragm coupling is divided into single-diaphragm couplings and double-diaphragm couplings. When the diaphragm of the double-diaphragm coupling is elastically deformed, it can effectively compensate for the axial, radial, and angular installation deviations between the motor rotor and the load shaft, reducing the damage of additional bending moments to the shaft system and bearings. However, for the motor rotor and the load shaft which are in the same coaxial state, the single-diaphragm coupling is more suitable. This is because during equipment operation, if an overload occurs by chance, the torque of the load shaft exceeds that of the motor rotor, and the equipment will vibrate (this phenomenon is extremely rare and belongs to an extreme damage situation). The deformation of the single-diaphragm in the single-diaphragm coupling can buffer the vibration force to prevent damage or even breakage of the motor rotor due to resonance. The single-diaphragm coupling plays an extreme protection role for the motor (that is, the main function of the single-diaphragm coupling is not to compensate for the axial, radial, and angular installation deviations between the motor rotor and the load shaft, but to buffer the vibration force in emergency situations to protect the motor and the load shaft). This does not require a more expensive double-diaphragm coupling.

[0004] Although the single diaphragm coupling can buffer the jitter force generated by the overload of the equipment through the deformation of the diaphragm, and plays an extreme protection role on the motor, but due to the elasticity of the diaphragm, when the equipment is normally operated to a certain high speed (when the equipment is not overloaded, the load shaft and the rotor need to keep coaxial rotation state), the rigidity between the shaft transmission is insufficient due to the existence of the single diaphragm coupling, and under high speed condition, the shaft connection is easy to occur micro deflection and abnormal jitter, and the stability of the axial output is limited during the load operation of the equipment, which is one of the main reasons why the synchronous motor will occur abnormal vibration or sound after reaching a certain output speed. In short, the single diaphragm coupling which can play a protection role on the shaft in the extreme situation of equipment overload, instead brings the risk of load shaft and rotor micro offset and abnormal jitter when the equipment is operated at high speed, and it is difficult to balance and adapt between the two.

[0005] In view of the above problems, it is urgent to make innovative design on the basis of the existing rotor coupling based on permanent magnet synchronous motor. SUMMARY

[0006] The technical scheme of the present application provides a solution significantly different from the prior art to solve the problem that the single diaphragm coupling which can play a protection role in the extreme situation of equipment overload, instead increases the risk of load shaft and rotor offset and jitter when the equipment is normally operated.

[0007] To achieve the above object, the present application provides the following technical scheme: a rotor coupling based on permanent magnet synchronous motor, comprising a symmetrical one-half shaft sleeve and a two-half shaft sleeve, further comprising:

[0008] A locking assembly arranged in the one-half shaft sleeve in proportion to the centrifugal force generated by the high-speed rotation of the one-half shaft sleeve to protect the motor shaft;

[0009] The locking assembly comprises a cavity opened in the one-half shaft sleeve in proportion, a gravity ball movably arranged in the cavity, a first sliding block movably arranged in the cavity, and a second sliding block also movably arranged in the cavity.

[0010] Preferably, the locking assembly further comprises a lightweight sliding block movably sleeved on the outer surface of the gravity ball;

[0011] The size of the lightweight sliding block is matched with the size of the cavity;

[0012] The lightweight sliding block is movably arranged in the cavity.

[0013] Preferably, the size of the first sliding block is matched with the size of the cavity;

[0014] The first sliding block slides in a straight and horizontal state inside the cavity.

[0015] Preferably, the side of the first sliding block and the side of the second sliding block in contact are provided with inclined surfaces, and the two inclined surfaces are polished.

[0016] The inclined surface of the side of the first sliding block and the inclined surface of the side of the second sliding block are in close contact.

[0017] Preferably, a circular groove is provided on one side of the first half shaft sleeve in a proportional manner.

[0018] Limiting blocks are fixed on both sides of the circular groove.

[0019] Preferably, a plug rod is fixed to one end of the second sliding block.

[0020] The diameter of the plug rod is consistent with the diameter of the circular groove.

[0021] The plug rod movably penetrates the inside of the circular groove.

[0022] Square grooves are provided on both sides of the plug rod.

[0023] The size of the square groove is adapted to the size of the limiting block, and the limiting block slides in the square groove.

[0024] Preferably, a first spring is fixedly connected between the first sliding block and the lightweight sliding block.

[0025] A second spring is fixedly connected between the second sliding block and the inner wall of the first half shaft sleeve in a symmetrical manner.

[0026] The elastic force of the first spring is smaller than the elastic force of the second spring.

[0027] Preferably, the gravity ball is located at the proximal end of the first half shaft sleeve.

[0028] The gravity ball is provided as a solid sphere, and the surface of the gravity ball is polished.

[0029] Preferably, a plurality of groups of lock grooves are provided on one side of the second half shaft sleeve in a proportional manner.

[0030] Each group of lock grooves corresponds to each group of plug rods.

[0031] The end of the lock groove is in the shape of an expanded port, and the end of the lock groove and the end of the plug rod are both chamfered.

[0032] Preferably, the maximum width of the end of the lock groove is greater than the diameter of the plug rod.

[0033] The width of the other end of the lock groove is consistent with the diameter of the plug rod.

[0034] Compared with the prior art, the present application has the following advantages:

[0035] In the application, when the device is normally operated, the motor rotor drives the load and the coupling to rotate at high speed as a whole. The application relies on the centrifugal force generated by the high-speed rotation of the first half shaft sleeve to throw the gravity ball from the near-end of the first half shaft sleeve to the far-end of the first half shaft sleeve. When the lightweight slider squeezes the first spring to the point where it cannot be compressed any further, the overall rigidity of the first spring is enhanced, similar to a rigid cylinder. At this time, the continuous squeezing of the lightweight slider will push the first slider to move, thereby inserting the one end of the insertion rod into the deep part of the locking groove. At this time, the connection between the first half shaft sleeve and the second half shaft sleeve is more secure, and the rigidity of the entire coupling is stronger, i.e., from flexible to rigid coupling. During the operation of the load device, the rotor and the load shaft can be effectively kept coaxial and stable rotation. If the device is overloaded in an extreme situation, the device will vibrate, which will cause the second half shaft sleeve to vibrate, thereby breaking the insertion rod. After that, the vibration force will be buffered by the deformation of the diaphragm, which will protect the motor and the load device. The application retains the protection of the traditional single-diaphragm coupling for the motor rotor and the load shaft in extreme situations, while reducing the possibility of unnecessary shaking of the traditional single-diaphragm coupling during normal operation of the device, which is more in line with the current needs of load device operation. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is the first perspective structural schematic diagram of the application.

[0037] Figure 2 It is the disassembled state structural schematic diagram of the application.

[0038] Figure 3 It is the locking state structural schematic diagram of the application.

[0039] Figure 4 It is the partial sectional structural schematic diagram of the application.

[0040] Figure 5 It is the gravity ball structural schematic diagram of the application.

[0041] Figure 6 It is the second slider structural schematic diagram of the application.

[0042] Figure 7 It is the limit block structural schematic diagram of the application.

[0043] Figure 8 It is the locking groove structural schematic diagram of the application.

[0044] Figure 9 It is the partial sectional structural schematic diagram of the application in the locking state.

[0045] In the figure: 1, the first half shaft sleeve; 2, the second half shaft sleeve; 3, the insertion rod; 4, the lock slot; 5, the cavity; 6, the lightweight sliding block; 7, the gravity ball; 8, the first sliding block; 9, the first spring; 10, the second sliding block; 11, the second spring; 12, the limiting block. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] Please refer to Figures 1 to 9 , the present application provides a technical solution: a rotor coupling based on a permanent magnet synchronous motor, comprising a symmetrically arranged first half shaft sleeve 1 and second half shaft sleeve 2, further comprising:

[0048] The locking assembly is arranged in the first half shaft sleeve 1 at an equal proportion and is driven by the centrifugal force generated by the high-speed rotation of the first half shaft sleeve 1 to protect the motor rotating shaft.

[0049] In a specific implementation, the present application is improved on the basis of a traditional single diaphragm coupling. As shown in the accompanying drawings, Figure 2 The insertion rod 3 is inserted into the lock slot 4 from the recessed part at the edge of the single diaphragm group, and the first half shaft sleeve 1 and the second half shaft sleeve 2 are reversely fixed and connected by a plurality of groups of hinge hole bolts distributed at an equal proportion. The surface of the hinge hole bolt is movably sleeved with a buffer sleeve. The specific connection mode can refer to the prior art, and the present application will not be described in detail here. In use, the motor rotor is inserted into the middle of the first half shaft sleeve 1, and the load shaft is inserted into the middle of the second half shaft sleeve 2.

[0050] The locking assembly comprises a cavity 5 arranged in the first half shaft sleeve 1 at an equal proportion, a gravity ball 7 movably arranged in the cavity 5, a first sliding block 8 movably arranged in the cavity 5, and a second sliding block 10 also movably arranged in the cavity 5.

[0051] The locking assembly further comprises a lightweight sliding block 6 movably sleeved on the outer surface of the gravity ball 7.

[0052] In a specific implementation, the lightweight sliding block 6 is light in texture, and the material of the lightweight sliding block 6 includes but is not limited to lightweight PP plastic and PVC plastic. The purpose is that when the gravity ball 7 is driven to move by the centrifugal force, the lightweight sliding block 6 can not only ensure that the first spring 9 can be smoothly compressed, but also can reduce the resistance of the movement of the gravity ball 7.

[0053] The dimensions of the lightweight slider 6 are adapted to the dimensions of the cavity 5;

[0054] The lightweight slider 6 is movably positioned inside the cavity 5.

[0055] In practice, both the surface of the lightweight slider 6 and the inner wall of the cavity 5 need to be polished. Although the two are sized to match, the friction between the lightweight slider 6 and the cavity 5 will not be too great when the lightweight slider 6 moves. This allows the gravity ball 7 to move smoothly to the distal end of the first half-shaft sleeve 1, and the movement of the lightweight slider 6 is more stable and less prone to deflection, ensuring that the first spring 9 is radially and horizontally compressed.

[0056] The dimensions of slider 8 are compatible with the dimensions of cavity 5;

[0057] Slider 8 slides horizontally in a straight line inside cavity 5.

[0058] In practice, the surface of slider 8 also needs to be polished. The stable horizontal movement of slider 8 ensures that when slider 8 pushes slider 10, slider 10 can move smoothly in the predetermined direction. (See attached...) Figure 4 As shown, guide posts are provided on one side of both the lightweight slider 6 and the first slider 8. The two ends of the first spring 9 are movably sleeved on the outer surface of the guide posts. As a prior art, the guide posts can effectively reduce the possibility of the first spring 9 twisting in this invention, so that the first spring 9 can be compressed horizontally and extend the service life of the first spring 9.

[0059] The sides of slider 8 and slider 10 that come into contact are both set as bevels, and the surfaces of the two bevels are polished.

[0060] The inclined surfaces on one side of slider 8 and the inclined surfaces on one side of slider 10 are in contact with each other.

[0061] In specific implementation, as shown in the appendix Figure 4 and attached Figure 6 As shown, when slider 8 moves, it will push slider 10. Under the action of the inclined planes of the two, the moving direction of slider 8 and the moving direction of slider 10 can be made perpendicular to each other, which provides one of the key conditions for the insertion rod 3 into the locking groove 4.

[0062] A circular groove is proportionally provided on one side of the No. 1 half-shaft sleeve 1;

[0063] Limiting blocks 12 are fixed on both sides of the circular groove.

[0064] One end of the second slider 10 is fixed with a plug rod 3;

[0065] The diameter of the insertion rod 3 is the same as the diameter of the circular groove;

[0066] The insertion rod 3 moves through the interior of the circular groove;

[0067] The two sides of the insertion rod 3 are provided with square grooves;

[0068] The size of the square groove is matched with the size of the limiting block 12, and the limiting block 12 slides in the square groove.

[0069] In specific implementation, in order to ensure that the insertion rod 3 can be smoothly inserted into the lock slot 4 along the predetermined direction, the limiting block 12 and the square groove provide limiting effect for the movement of the insertion rod 3, and the cooperation between the round groove and the insertion rod 3 provides limiting effect and supporting effect for the movement of the insertion rod 3 again, so that the insertion rod 3 can be smoothly inserted into the lock slot 4 along the predetermined direction.

[0070] The first spring 9 is fixedly connected between the first sliding block 8 and the lightweight sliding block 6;

[0071] The second spring 11 is fixedly connected between the second sliding block 10 and the inner wall of the first half shaft sleeve 1 in a symmetrical manner;

[0072] The elastic force of the first spring 9 is smaller than the elastic force of the second spring 11.

[0073] In specific implementation, when the gravity ball 7 is driven to move by the centrifugal force, the gravity ball 7 first presses the first spring 9, and before the first spring 9 is compressed to the limit, the indirect thrust of the gravity ball 7 on the first sliding block 8 is released by the first spring 9, and the thrust on the first sliding block 8 is small and not enough to compress the second spring 11, that is, under the action of the gravity of the gravity ball 7 itself, the moving distance of the gravity ball 7 is short, and the insertion rod 3 and the lock slot 4 are in an initial state of not contacting each other, when the motor rotor rotates at high speed, the centrifugal force increases, the gravity ball 7 driven by the centrifugal force has enough thrust to press the first spring 9, when the first spring 9 is compressed to the limit, the first spring 9 becomes a structure similar to a rigid column, at this time, the thrust of the gravity ball 7 can be smoothly transmitted to the first sliding block 8, and finally the second spring 11 is compressed, so that the insertion rod 3 is inserted into the lock slot 4.

[0074] The gravity ball 7 is located at the proximal end of the first half shaft sleeve 1;

[0075] The gravity ball 7 is provided as a solid sphere, and the surface of the gravity ball 7 is polished.

[0076] In specific implementation, the gravity ball 7 has a certain weight, when the first half shaft sleeve 1 rotates at high speed, the heavier the object, the greater the force pushed outward under the action of the centrifugal force, and the friction between the spherical structure and other components is smaller than the friction between other shape structures and other components, so that the thrust of the gravity ball 7 can press the first spring 9 and the second spring 11, and the insertion rod 3 is inserted into the lock slot 4.

[0077] A plurality of groups of lock slots 4 are provided on one side of the second half shaft sleeve 2 in a proportional manner;

[0078] Each set of locking slots 4 corresponds to each set of insertion rods 3;

[0079] The cross section of one end of the locking slot 4 is flared, and the other end of the locking slot 4 and the insertion rod 3 are both chamfered.

[0080] The maximum width of one end of the locking slot 4 is greater than the diameter of the insertion rod 3;

[0081] The width of the other end of the locking slot 4 is consistent with the diameter of the insertion rod 3.

[0082] In specific implementation, the flared end of the locking slot 4 allows the insertion rod 3 to be inserted more smoothly, without the need for precise alignment. After the insertion rod 3 is inserted into the locking slot 4, the overall rigidity of the device is enhanced, effectively reducing the possibility of deformation and shaking of the single diaphragm group during normal operation of the load equipment, ensuring the stability of the equipment during normal operation. It is important to note that the insertion rod 3 is made of brittle material, including but not limited to gray cast iron material. This is because the insertion rod 3 needs to remain inserted into the locking slot 4 during normal operation of the equipment, and the coupling itself cannot have the risk of shaking. When the equipment is inadvertently overloaded, the more expensive load shaft and motor need to be protected, the load shaft torque increases, and the equipment may vibrate and break the most fragile insertion rod 3 first. Before the vibration causes fatal damage to the load shaft and rotor, the vibration force will be first buffered by the diaphragm group, protecting the rotor and load shaft.

[0083] Working principle: when using the rotor coupling based on permanent magnet synchronous motor, first, according to the existing mode, the first half shaft sleeve 1 and the second half shaft sleeve 2 are connected with the motor rotor and the load shaft respectively, the specific connection mode is the existing mature technology, which is not described in detail. When the motor rotor drives the first half shaft sleeve 1 and the second half shaft sleeve 2 to rotate at high speed, the gravity ball 7 is "thrown" to the far end of the first half shaft sleeve 1 under the influence of centrifugal force. Under the pushing of the gravity ball 7, the first spring 9 is first squeezed, and when the first spring 9 is compressed to the extreme, the pushing force of the gravity ball 7 is almost all transmitted to the first sliding block 8, and the loss of a small part of the pushing force can be ignored. At this time, the first sliding block 8 is pushed and moves along the same trajectory as the gravity ball 7. Under the extrusion of the inclined surface of the first sliding block 8 and the second sliding block 10, the second sliding block 10 drives the insertion rod 3 to move to the direction of the lock slot 4, and the second spring 11 is compressed. Until the insertion rod 3 is inserted into the other end of the lock slot 4, a rigid connection is formed between the first half shaft sleeve 1 and the second half shaft sleeve 2, that is, the single diaphragm group between the first half shaft sleeve 1 and the second half shaft sleeve 2 will not easily deform and shake, which can reduce the risk of damage to the rotor and the load shaft caused by external factors such as accidental touch of the coupling, outdoor wind blowing the coupling, etc. When the equipment is shut down, the motor rotor stops rotating, and the gravity ball 7 loses the centrifugal force driving and no longer has enough pushing force to push the first sliding block 8. Thus, under the rebound of the second spring 11, the insertion rod 3 is pulled out from the inside of the lock slot 4, which can facilitate the disassembly and assembly of the device.

[0084] When the equipment is overloaded, the load shaft torque becomes larger, and the equipment appears abnormal vibration. The vibration force will first break the most weak insertion rod 3, and then the vibration force is transmitted to the single diaphragm group, and the vibration force is buffered by the deformation of the single diaphragm group, so as to prevent fatal damage to the rotor and the load shaft.

[0085] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor coupling based on a permanent magnet synchronous motor, comprising a first half shaft sleeve (1) and a second half shaft sleeve (2) arranged symmetrically, characterized in that, Also include: The first half shaft sleeve (1) and the second half shaft sleeve (2) are movably provided with a single diaphragm group; The locking assembly is arranged in the first half shaft sleeve (1) in equal proportion and is driven by the centrifugal force generated by the high-speed rotation of the first half shaft sleeve (1) to protect the motor shaft; The locking assembly includes a cavity (5) opened in the first half shaft sleeve (1), a gravity ball (7) movably arranged in the cavity (5), a first sliding block (8) movably arranged in the cavity (5), and a second sliding block (10) also movably arranged in the cavity (5); The locking assembly further comprises a light sliding block (6) movably sleeved on the outer surface of the gravity ball (7); The side of the first sliding block (8) and the side of the second sliding block (10) are provided with inclined surfaces, and the two inclined surfaces are polished; The inclined surface on one side of the first sliding block (8) and the inclined surface on one side of the second sliding block (10) are in close contact; The first half shaft sleeve (1) is proportionally provided with a circular groove on one side; One end of the second sliding block (10) is fixedly connected with a plug rod (3); The diameter of the plug rod (3) is consistent with the diameter of the circular groove; The plug rod (3) movably penetrates the inside of the circular groove; The first sliding block (8) and the light sliding block (6) are fixedly connected with a first spring (9); The second sliding block (10) and the inner wall of the first half shaft sleeve (1) are fixedly connected with a second spring (11); The second half shaft sleeve (2) is proportionally provided with a plurality of groups of lock grooves (4) on one side; Each group of lock grooves (4) corresponds to each group of plug rods (3).

2. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: The size of the light sliding block (6) is adapted to the size of the cavity (5); The light sliding block (6) is movably arranged in the cavity (5).

3. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: The size of the first sliding block (8) is adapted to the size of the cavity (5); The first sliding block (8) slides in a straight line in the cavity (5).

4. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: The two sides of the circular groove are fixedly connected with a limiting block (12).

5. A rotor coupling based on a permanent magnet synchronous motor according to claim 4, characterized in that: The plug rod (3) is provided with a square groove on both sides; The size of the square groove is adapted to the size of the limiting block (12), and the limiting block (12) slides in the square groove.

6. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: The elastic force of the first spring (9) is smaller than the elastic force of the second spring (11).

7. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: The gravity ball (7) is located at the proximal end of the first half shaft sleeve (1); The gravity ball (7) is provided as a solid sphere, and the surface of the gravity ball (7) is polished.

8. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: The cross section of one end of the lock groove (4) is in the shape of an expanded mouth, and one end of the lock groove (4) and one end of the plug rod (3) are both chamfered.

9. A rotor coupling based on a permanent magnet synchronous motor according to claim 8, characterized in that: The maximum width of one end of the lock groove (4) is greater than the diameter of the plug rod (3); The width of the other end of the lock groove (4) is consistent with the diameter of the plug rod (3).

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