Rotor coupling based on permanent magnet synchronous motor

Abstract

The invention discloses a rotor coupling based on a permanent magnet synchronous motor, and relates to the technical field of couplings. The locking assemblies are arranged in the first half shaft sleeve in equal proportion and are driven by centrifugal force generated by high-speed rotation of the first half shaft sleeve to protect a motor rotating shaft. According to the invention, the coaxial stable rotation of the rotor and the load shaft can be effectively kept in the operation process of the load equipment, and if the equipment is overloaded accidentally, once the equipment shakes, the second half shaft sleeve can be driven to shake, so that the insertion rod is forcibly broken off, and then the vibration force can be buffered by the deformation of the diaphragm; according to the single-diaphragm coupling, the motor and load equipment are protected, the protection effect of a traditional single-diaphragm coupling on a motor rotor and a load shaft under the extreme condition is reserved, meanwhile, the possibility that the traditional single-diaphragm coupling generates unnecessary shaking when the equipment normally operates is reduced, and the current operation requirement of the load equipment is better met.

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: 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; 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.

[0008] Preferably, the locking assembly further comprises a lightweight sliding block movably sleeved on the outer surface of the gravity ball; The size of the lightweight sliding block is matched with the size of the cavity; The lightweight sliding block is movably arranged in the cavity.

[0009] Preferably, the size of the first sliding block is matched with the size of the cavity; The first sliding block slides in a straight and horizontal state in the cavity.

[0010] 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. 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.

[0011] Preferably, a circular groove is provided on one side of the first half shaft sleeve in a proportional manner. Two sides of the circular groove are fixed with limiting blocks.

[0012] Preferably, a plug rod is fixed to one end of the second sliding block. The diameter of the plug rod is consistent with the diameter of the circular groove. The plug rod is movably penetrated into the inside of the circular groove. Square grooves are provided on two sides of the plug rod. The size of the square groove is adapted to the size of the limiting block, and the limiting block slides in the square groove.

[0013] Preferably, a first spring is fixedly connected between the first sliding block and the lightweight sliding block. 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. The elastic force of the first spring is smaller than the elastic force of the second spring.

[0014] Preferably, the gravity ball is located at the proximal end of the first half shaft sleeve. The gravity ball is provided as a solid sphere, and the surface of the gravity ball is polished.

[0015] Preferably, a plurality of groups of lock grooves are provided on one side of the second half shaft sleeve in a proportional manner. Each group of lock grooves corresponds to each group of plug rods. One end of the lock groove is in the shape of an expanded port, and one end of the lock groove and one end of the plug rod are both chamfered.

[0016] Preferably, the maximum width of one end of the lock groove is greater than the diameter of the plug rod. The width of the other end of the lock groove is consistent with the diameter of the plug rod.

[0017] Compared with the prior art, the present application has the following beneficial effects: When the device is normally operated, the motor rotor drives the load and the coupling to rotate at high speed as a whole, the present 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 extrudes the first spring to the point where it can no longer be compressed, the overall rigidity of the first spring is enhanced, similar to a rigid cylinder, at this time the continuous extrusion of the lightweight slider will push the first slider to move, so that the one end of the insertion rod is inserted into the deep inside of the lock groove, at this time the connection between the first half shaft sleeve and the second half shaft sleeve is more firm, the rigidity of the entire coupling is stronger, that is, from flexible to rigid coupling, the load device can effectively maintain the coaxial and stable rotation of the rotor and the load shaft during operation, and if the device is overloaded in this extreme case, once the device is shaken, it will drive the second half shaft sleeve to shake, thereby forcibly breaking the insertion rod, then the vibration force will be buffered by the deformation of the diaphragm, protecting the motor and the load device, the present application retains the protection of the traditional single diaphragm coupling for the motor rotor and the load shaft in extreme cases, while also reducing the possibility of unnecessary shaking of the traditional single diaphragm coupling when the device is normally operated, and is more in line with the current needs of load device operation. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the first three-dimensional structure schematic diagram of the present application.

[0019] Figure 2 It is the disassembled state structure schematic diagram of the present application.

[0020] Figure 3 It is the locking state structure schematic diagram of the present application.

[0021] Figure 4 It is the local section structure schematic diagram of the present application.

[0022] Figure 5 It is the gravity ball structure schematic diagram of the present application.

[0023] Figure 6 It is the second slider structure schematic diagram of the present application.

[0024] Figure 7 It is the limit block structure schematic diagram of the present application.

[0025] Figure 8 It is the lock groove structure schematic diagram of the present application.

[0026] Figure 9 It is the local section structure schematic diagram of the present application in the locking state.

[0027] 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

[0028] 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 the present application.

[0029] 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: proportionally arranged in the first half shaft sleeve 1 to be driven by the centrifugal force generated by the high-speed rotation of the first half shaft sleeve 1 to protect the motor shaft locking assembly; In a specific implementation, the present application is improved on the basis of the traditional single diaphragm coupling. As shown in the accompanying drawings, Figure 2 a single diaphragm group is movably arranged between the first half shaft sleeve 1 and the second half shaft sleeve 2, the single diaphragm group has a flower-like appearance, the insertion rod 3 passes through the recessed part at the edge of the single diaphragm group and is inserted into the lock slot 4, the first half shaft sleeve 1 and the second half shaft sleeve 2 are reversely and fixedly connected by a plurality of groups of hinge hole bolts which are proportionally distributed and spaced, a buffer sleeve is movably arranged on the surface of the hinge hole bolt, and the specific connection mode can refer to the prior art, which will not be described in detail herein. 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.

[0030] The locking assembly comprises a cavity 5 proportionally 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.

[0031] The locking assembly further comprises a lightweight sliding block 6 movably sleeved on the outer surface of the gravity ball 7; 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, so 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 reduce the resistance of the gravity ball 7 moving.

[0032] The size of the lightweight sliding block 6 is adapted to the size of the cavity 5; The lightweight sliding block 6 is movably arranged in the cavity 5.

[0033] In the specific implementation, the surface of the light sliding block 6 and the inner wall of the cavity 5 are polished, and the two are adapted in size, but the friction between the light sliding block 6 and the cavity 5 is not too large when the light sliding block 6 moves, which can make the gravity ball 7 move smoothly to the far end of the first half shaft sleeve 1, and the movement of the light sliding block 6 is more stable and not easy to deviate, so as to ensure that the first spring 9 is compressed radially and horizontally.

[0034] 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 and horizontal state inside the cavity 5.

[0035] In the specific implementation, the surface of the first sliding block 8 also needs to be polished, and the horizontal and stable movement of the first sliding block 8 can ensure that the second sliding block 10 can move smoothly in the predetermined direction when the first sliding block 8 pushes the second sliding block 10. Figure 4 As shown in the accompanying drawings, one side of the light sliding block 6 and one side of the first sliding block 8 are provided with guide columns, and the two ends of the first spring 9 are movably sleeved on the outer surfaces of the guide columns. The guide columns can effectively reduce the possibility of twisting of the first spring 9 in the prior art, so that the first spring 9 can be compressed horizontally and the service life of the first spring 9 is prolonged.

[0036] One side of the first sliding block 8 and one side of the second sliding block 10 are provided with inclined surfaces, and the surfaces of the two inclined surfaces are polished; The inclined surface on one side of the first sliding block 8 is in abutment with the inclined surface on one side of the second sliding block 10.

[0037] In the specific implementation, as shown in the accompanying drawings, Figure 4 and the accompanying drawings, Figure 6 the first sliding block 8 pushes the second sliding block 10 when moving, and under the action of the two inclined surfaces, the moving direction of the first sliding block 8 is perpendicular to the moving direction of the second sliding block 10, which provides one of the key conditions for the insertion of the insertion rod 3 into the lock slot 4.

[0038] A circular groove is proportionally formed on one side of the first half shaft sleeve 1; Limiting blocks 12 are fixed on both sides of the circular groove.

[0039] The insertion rod 3 is fixed to one end of the second sliding block 10; The diameter of the insertion rod 3 is consistent with the diameter of the circular groove; The insertion rod 3 movably penetrates the inside of the circular groove; Square grooves are formed on both sides of the insertion rod 3; 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.

[0040] In specific implementation, to ensure that the insertion rod 3 can be smoothly inserted into the lock slot 4, the limiting block 12 and the square slot provide limiting effect for the movement of the insertion rod 3, and the cooperation between the round slot 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 according to the predetermined direction.

[0041] The first spring 9 is fixedly connected between the first sliding block 8 and the lightweight sliding block 6; 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; The elastic force of the first spring 9 is smaller than the elastic force of the second spring 11.

[0042] 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 is 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.

[0043] 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.

[0044] 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 outward pushing force 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.

[0045] A plurality of groups of lock slots 4 are provided on one side of the second half shaft sleeve 2 in a proportional manner; Each group of lock slots 4 corresponds to each group of insertion rods 3; One end of the lock slot 4 is in a flared cross-section, and one end of the lock slot 4 and one end of the insertion rod 3 are both chamfered.

[0046] The maximum width of one end of the lock slot 4 is greater than the diameter of the insertion rod 3; The width of the other end of the lock slot 4 is consistent with the diameter of the insertion rod 3.

[0047] In a specific implementation, the flared end of the lock 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 lock slot 4, the overall rigidity of the device is increased, 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. This is because the insertion rod 3 needs to remain inserted into the lock 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, causing the most fragile insertion rod 3 to break first. Before the vibration causes fatal damage to the load shaft and rotor, the vibration force is first buffered by the diaphragm group, protecting the rotor and load shaft.

[0048] Working principle: When using the rotor coupling based on permanent magnet synchronous motor, first connect the No. 1 half shaft sleeve 1 and the No. 2 half shaft sleeve 2 with the motor rotor and the load shaft respectively according to the existing method. The specific connection method is the existing mature technology, which will not be described in detail here. When the motor rotor drives the No. 1 half shaft sleeve 1 and the No. 2 half shaft sleeve 2 to rotate at high speed, the gravity ball 7 is "thrown" to the far end of the No. 1 half shaft sleeve 1 under the influence of centrifugal force. Under the push of the gravity ball 7, the No. 1 spring 9 is first compressed. When the No. 1 spring 9 is compressed to the extreme, the push force of the gravity ball 7 is almost entirely transmitted to the No. 1 sliding block 8, and the loss of a small part of the push force can be ignored. At this time, the No. 1 sliding block 8 is pushed and moves along the same trajectory as the gravity ball 7. Under the action of the inclined surface of the No. 1 sliding block 8 and the No. 2 sliding block 10, the No. 2 sliding block 10 drives the insertion rod 3 to move towards the lock slot 4, and the No. 2 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 No. 1 half shaft sleeve 1 and the No. 2 half shaft sleeve 2. That is, the single diaphragm group between the No. 1 half shaft sleeve 1 and the No. 2 half shaft sleeve 2 will not easily deform and shake, reducing the risk of damage to the rotor and load shaft caused by external factors such as accidental touching 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 driving force of the centrifugal force, so it no longer has enough push force to push the No. 1 sliding block 8. Thus, under the rebound of the No. 2 spring 11, the insertion rod 3 is pulled out of the lock slot 4, making it easy to disassemble the device.

[0049] When the equipment is overloaded, the load shaft torque increases, and the equipment vibrates abnormally. The vibration force will first break the most fragile insertion rod 3, and then the vibration force will be transmitted to the single diaphragm group, which will buffer the vibration force through deformation to prevent fatal damage to the rotor and load shaft.

[0050] 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 rotor coupling based on a permanent magnet synchronous motor, comprising a first half-shaft sleeve (1) and a second half-shaft sleeve (2) symmetrically arranged, characterized in that, Also includes: A locking component is set proportionally inside the first half-shaft sleeve (1) and 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) proportionally opened in the first half-shaft sleeve (1), a gravity ball (7) movably disposed in the cavity (5), a first slider (8) movably disposed in the cavity (5), and a second slider (10) movably disposed in the cavity (5).

2. The rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: The locking assembly also includes a lightweight slider (6) that is movable and fits on the outer surface of the gravity ball (7); The dimensions of the lightweight slider (6) are adapted to the dimensions of the cavity (5); The lightweight slider (6) is movably disposed inside the cavity (5).

3. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: The dimensions of the first slider (8) are adapted to the dimensions of the cavity (5); The first slider (8) slides horizontally in a straight line inside the cavity (5).

4. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: The sides of the first slider (8) and the second slider (10) that are in contact are both set as inclined surfaces, and the surfaces of the two inclined surfaces are polished. The inclined surfaces on one side of the first slider (8) and the inclined surfaces on one side of the second slider (10) are in contact with each other.

5. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: A circular groove is proportionally provided on one side of the first half-shaft sleeve (1); Limiting blocks (12) are fixed on both sides of the circular groove.

6. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: One end of the second slider (10) is fixed with a plug rod (3); The diameter of the insert (3) is the same as the diameter of the circular groove; The insert (3) extends through the interior of the circular groove; Square grooves are provided on both sides of the insertion rod (3); The dimensions of the square groove are adapted to the dimensions of the limiting block (12), and the limiting block (12) slides inside the square groove.

7. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: A spring (9) is fixedly connected between the first slider (8) and the lightweight slider (6); A second spring (11) is symmetrically fixed between the inner wall of the second slider (10) and the first half-shaft sleeve (1). The elastic force of the first spring (9) is less than that of the second spring (11).

8. 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 a solid sphere, and the surface of the gravity ball (7) is polished.

9. A rotor coupling based on a permanent magnet synchronous motor according to claim 1, characterized in that: The second half-shaft sleeve (2) has several sets of locking grooves (4) opened proportionally on one side; Each set of lock slots (4) corresponds to each set of insert rods (3); The cross-section of one end of the lock groove (4) is flared, and both one end of the lock groove (4) and one end of the insertion rod (3) are chamfered.

10. A rotor coupling based on a permanent magnet synchronous motor according to claim 9, characterized in that: The maximum width of one end of the locking groove (4) is greater than the diameter of the insertion rod (3); The width of the other end of the locking groove (4) is the same as the diameter of the insertion rod (3).

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