Non-contact motor magnetic braking device

Abstract

A non-contact motor magnetic braking device provided by the present invention comprises a motor rotating shaft, a motor shell and a magnetic braking device, the magnetic braking device comprises a static magnetic force assembly and a dynamic magnetic force assembly, the static magnetic force assembly is fixedly installed on the motor shell, the dynamic magnetic force assembly is in threaded connection with the motor rotating shaft, and the static magnetic force assembly is fixedly installed on the motor shell. When the rotating shaft is observed towards the output end of the motor rotating shaft, the working rotating direction of the motor rotating shaft is consistent with the thread direction so that the movable magnetic assembly can move in the direction away from the motor, and the static magnetic assembly and the movable magnetic assembly are different in polarity and are oppositely arranged so that mutual attraction can be achieved. And a limiting part for preventing the static magnetic component and the dynamic magnetic component from being in contact with each other is arranged between the static magnetic component and the dynamic magnetic component. After the scheme is adopted, the mutual attraction effect of magnetic force is effectively utilized to achieve the braking effect, non-contact braking of the motor is achieved through the static magnetic force assembly, the dynamic magnetic force assembly and the limiting part, and the abrasion problem caused by friction in a traditional braking mode is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of motor brake devices, and in particular relates to a non-contact motor magnetic brake device. Background Art

[0002] As an indispensable power source in modern industry and daily life, motors play an important role in various equipment. The start and stop control of motors is one of the basic requirements in motor applications. Especially in heavy equipment such as cranes, when the motor works to lift the load (the motor shaft is working and rotating) and hoist the heavy objects, if there is no effective braking system to limit the movement of the motor shaft, there will not only be great safety hazards, but also may cause damage to the motor. Therefore, the design of the braking system becomes particularly important to ensure that the equipment can stop quickly and smoothly when needed, and to ensure that the motor shaft does not rotate.

[0003] The Chinese utility model patent with application number 202022147240.8 discloses a motor brake, including a shell, a contact plate, an electromagnet and an armature are arranged in the shell, the armature is fixedly mounted on the contact plate, and an adjusting device is also arranged in the shell, the adjusting device includes an adjusting rod, the adjusting rod passes through the contact plate, the adjusting rod is also threaded with an adjusting nut, and a spring is also sleeved on the adjusting rod, one end of the spring is against the contact plate, and the other end is against the adjusting nut; when the motor is powered off, the electromagnet will also be powered off, so the electromagnet will not absorb the armature, and because one end of the spring is against the contact plate and the other end is against the adjusting nut, under the action of the spring, the contact plate will contact the friction plate, thereby achieving a braking effect.

[0004] This mechanical braking method that relies on friction contact to achieve motor braking is currently very common, but in fact, mechanical braking will cause wear due to frequent physical contact, thereby affecting the braking efficiency and service life, and there are major safety hazards. Therefore, the utility model patent with application number 202022147240.8 proposes to compensate for the problem of decreased contact force between the contact plate and the friction plate caused by wear by adjusting the nut. However, this method does not fundamentally solve the problem of braking effect attenuation caused by friction loss. Summary of the invention

[0005] The present invention proposes a non-contact motor magnetic braking device, which utilizes the mutual attraction of magnetic forces to achieve a braking effect. By adopting a static magnetic component, a dynamic magnetic component and a limit part, non-contact braking of the motor is achieved, reducing the wear problem caused by friction in traditional braking methods and extending the service life of the braking device.

[0006] In order to solve the above technical problems, the technical solution of the present invention is:

[0007] A non-contact motor magnetic braking device comprises a motor shaft, a motor housing and a magnetic braking device, wherein the magnetic braking device comprises a static magnetic component and a dynamic magnetic component, wherein the static magnetic component is fixedly mounted on the motor housing, and the dynamic magnetic component is threadedly connected to the motor shaft, and when observing facing the output end of the motor shaft, the working rotation direction of the motor shaft is consistent with the thread direction so that the dynamic magnetic component moves in a direction away from the motor, the static magnetic component and the dynamic magnetic component have different polarities and are arranged relative to each other to achieve mutual attraction, and a limiting portion is arranged between the static magnetic component and the dynamic magnetic component to prevent the two from contacting each other.

[0008] In the present invention, when the motor is not working, the dynamic magnetic component will be adsorbed or approach the static magnetic component under the action of the magnetic attraction force. When the motor shaft attempts to rotate, the position of the dynamic magnetic component changes relative to the static magnetic component, and this change causes the direction of the magnetic attraction force to form an angle with the rotation direction of the motor shaft. This angle causes the magnetic attraction force to produce a component perpendicular to the axis of the shaft. Since the direction of this component is perpendicular to the axis of the motor shaft, it will generate a resistance torque around the motor shaft, and the direction of this resistance torque is opposite to the direction in which the motor shaft attempts to rotate. Based on the above principles, the present invention designs a non-contact motor magnetic braking device.

[0009] Since the threads on the motor shaft form a spiral pair with the dynamic magnetic assembly, when the motor shaft rotates, it will exert a tangential force on the dynamic magnetic assembly. Moreover, in the threaded connection, the inclined surface of the thread will convert part of the tangential force into a normal force along the axial direction. Among them, the tangential force is along the tangential direction of the thread. This tangential force causes the dynamic magnetic assembly to move along the thread in the direction away from the motor; the normal force on the inclined surface of the thread ensures that the dynamic magnetic assembly can move along the correct axial path, rather than simply rotating around the motor shaft. Therefore, under the combined action of the tangential force and the normal force, the dynamic magnetic assembly can overcome the magnetic attraction between it and the static magnetic assembly and the friction between the threaded connection, so that the dynamic magnetic assembly can move axially on the motor shaft.

[0010] When the motor shaft stops working, the dynamic magnetic assembly will no longer be subject to the outward force caused by the threaded connection. And as long as the distance between the two is appropriate, the magnetic attraction between the dynamic magnetic assembly and the static magnetic assembly will always exist. Therefore, when the motor shaft stops rotating, the dynamic magnetic assembly will be affected by the magnetic attraction and move in the direction of the static magnetic assembly, and the closer the two are, the greater the magnetic attraction. When the motor shaft tends to rotate abnormally, the magnetic attraction will generate a resistance torque, and the direction of this resistance torque is opposite to the direction in which the motor shaft is trying to rotate, thereby achieving a braking effect.

[0011] It is worth noting that the presence of the stopper can prevent the dynamic magnetic component from directly contacting the static magnetic component. Due to the magnetic attraction between the two, if there is no stopper, the dynamic magnetic component may directly hit the static magnetic component, causing mechanical wear or even damage.

[0012] It should also be noted that in order to achieve the movement of the dynamic magnetic assembly away from the motor when the motor shaft is working normally, there are two solutions: if the motor shaft rotates clockwise when working normally (the observer observes from the output end facing the motor shaft), the threads on the motor shaft and in the dynamic magnetic assembly are both right-handed threads; if the motor shaft rotates counterclockwise when working normally, the threads on the motor shaft and in the dynamic magnetic assembly are both left-handed threads.

[0013] Preferably, the static magnetic force component includes a static magnetic yoke and a static magnet fixedly mounted on one end of the static magnetic yoke, the static magnetic yoke is fixedly mounted on the motor housing, the dynamic magnetic force component includes a dynamic magnetic yoke and a dynamic magnet fixedly mounted on one end of the dynamic magnetic yoke, the dynamic magnetic yoke is threadedly connected to the motor shaft, and the static magnet and the dynamic magnet have different polarities and are relatively arranged. The static magnetic yoke and the dynamic magnetic yoke can not only support the magnets, but also help guide and concentrate the magnetic field, so that the magnetic attraction is more concentrated, thereby enhancing the braking effect. The static magnet and the dynamic magnet have different polarities and are relatively arranged, which can maximize the effect of the magnetic attraction, thereby improving the braking efficiency.

[0014] Among them, a screw is fixedly installed on the motor shaft, and the moving magnetic yoke is threadedly connected to the screw. Since the length of the motor shaft is fixed, when the motor shaft rotates, the moving magnetic yoke will perform spiral motion on the screw. The rotation of the screw can be accurately converted into the axial movement of the moving magnetic yoke, thereby realizing precise control of the position of the moving magnetic yoke. Compared with the sliding connection, the threaded connection can more directly and effectively realize the axial movement of the moving magnetic assembly, which helps to overcome the initial magnetic attraction more quickly, thereby improving the startup efficiency of the equipment. In addition, the threaded connection can also lock the position of the moving magnetic assembly after braking is completed to prevent position changes caused by vibration and other reasons, and compared with the general sliding connection, the threaded connection is less prone to wear at the connection.

[0015] Regarding how to realize the function that the moving magnet can reliably and quickly return to the static magnet after the motor shaft stops, the present invention provides the following preferred solutions:

[0016] The first solution: also includes an elastic reset component, the elastic reset component includes an elastic member and a first positioning member, the first positioning member is fixedly mounted on the end of the motor shaft away from the motor housing, one end of the elastic member is mounted on the moving magnetic yoke, and the other end is mounted on the first positioning member. In this way, when the motor is working, the moving magnetic yoke will move in the direction away from the static magnetic yoke, and continuously compress the elastic member, so that it stores a large amount of elastic potential energy; when the motor stops working, the elastic member releases the stored elastic potential energy, thereby automatically resetting the dynamic magnetic assembly to the initial position. Setting up such a component can prevent the dynamic magnetic assembly from being unable to reset to the vicinity of the static magnetic assembly due to external interference, thereby preventing the braking system from failing.

[0017] It is worth mentioning that when the motor is working, the dynamic magnetic assembly moves in the direction away from the static magnetic assembly, so the elastic part will continue to compress and give the dynamic magnetic assembly a resistance. This resistance is in the same direction as the magnetic attraction and is opposite to the thrust of the screw to the dynamic magnetic assembly. When the sum of the resistance and the magnetic attraction is the same as the thrust, the dynamic magnetic assembly can stop axial movement and only rotate with the motor shaft. In this way, the function of avoiding overtravel of the dynamic magnetic assembly is realized, and the reliability of the device is improved.

[0018] The second solution: also includes a magnetic reset component, the magnetic reset component includes a first magnet, a second magnet and a second positioning member, the second positioning member is fixedly mounted on the end of the motor shaft away from the motor housing, the first magnet is mounted on the moving magnetic yoke, the second magnet is fixedly mounted on the second positioning member, the first magnet and the second magnet have the same polarity and are arranged relative to each other to achieve mutual repulsion. In this way, when the motor stops working, the magnetic reset component automatically resets the dynamic magnetic force component to the initial position through the mutual repulsion of the first magnet and the second magnet. Compared with the elastic reset component, the magnetic reset method reduces mechanical contact and avoids wear caused by contact. Similarly, this solution can also achieve the function of preventing the dynamic magnetic force component from overtravel.

[0019] The second positioning member is fixedly provided with an elastic stopper to prevent the first magnet from contacting the second magnet, and the elastic stopper is located between the moving magnetic yoke and the second positioning member. This arrangement can prevent the moving magnetic yoke from directly and rigidly contacting the second positioning member when the first magnet and the second magnet fail, thereby effectively protecting the device from damage.

[0020] Preferably, the limiting part includes a limiting bracket and a yoke limiting block, the limiting bracket is fixedly mounted on the motor shaft, the yoke limiting block is sleeved on the motor shaft, the yoke limiting block is fixedly connected to the limiting bracket, and the yoke limiting block is located between the static magnetic yoke and the dynamic magnetic yoke. In this way, the yoke limiting block can avoid direct contact between the static magnetic component and the dynamic magnetic component, and prevent mechanical collision or wear between the two.

[0021] It is worth mentioning that if the static magnetic component and the dynamic magnetic component fit together due to magnetic attraction, a larger current is required to overcome the resistance formed by the magnetic attraction when the motor starts, which may cause excessive starting current, burdening the power supply and the motor itself, and both may also cause wear due to instantaneous relative movement. The existence of the limit bracket and the yoke limit block can effectively solve the above problems.

[0022] The limit bracket and the yoke limit block are both made of non-magnetic stainless steel. Non-magnetic stainless steel will not be magnetized, avoiding interference with the magnetic attraction of the magnet assembly due to material magnetization, ensuring that the brake system works stably in a magnetic field environment; and this also enables the limit part to work stably for a long time in harsh environments.

[0023] Preferably, a blocking part is further included, and the blocking part is fixedly mounted on the top of the motor shaft. In this way, the blocking part can prevent the dynamic magnetic component or the elastic reset component or the magnetic reset component from falling off the motor shaft under extreme conditions (such as vibration or impact), thereby improving safety. The blocking part can be a common component such as a retaining spring, a locking nut and a pin on the market.

[0024] Preferably, it also includes a bearing, wherein the outer ring of the bearing is fixedly installed in the motor housing, the inner ring of the bearing is fixedly matched with the motor shaft, and one end of the limit bracket rests on the inner ring of the bearing. One end of the limit bracket rests on the inner ring of the bearing, which can ensure that the position of the limit bracket is accurate and fixed, and further avoid displacement when the motor shaft rotates. In addition, the limit bracket also obtains stable support to ensure its stability on the motor shaft, especially when the dynamic magnetic component rests on the yoke limit block. The stable support obtained by the limit bracket by resting on the inner ring of the bearing is particularly important, which can ensure the stability of the position of the dynamic magnetic component on the limit block and avoid braking failure caused by the movement of the dynamic magnetic component.

[0025] To sum up, such a non-contact motor magnetic braking device utilizes the mutual attraction of magnetic forces to achieve the braking effect. By adopting static magnetic components, dynamic magnetic components and limit parts, non-contact braking of the motor is achieved, which reduces the wear problem caused by friction in traditional braking methods and extends the service life of the braking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 This is a structural schematic diagram of Example 1 of the non-contact motor magnetic braking device of the present invention;

[0028] Figure 2 This is a structural schematic diagram of Example 2 of the non-contact motor magnetic braking device of the present invention;

[0029] In the figure,

[0030] 1-motor shaft; 11-screw;

[0031] 2-motor housing;

[0032] 3-magnetic brake device; 31-static magnetic force component; 311-static magnetic yoke; 312-static magnet; 32-dynamic magnetic force component; 321-dynamic magnetic yoke; 322-dynamic magnet;

[0033] 4-elastic reset assembly; 41-elastic member; 42-first positioning member;

[0034] 5-magnetic reset assembly; 51-first magnet; 52-second magnet; 53-second positioning member; 531-elastic limit block;

[0035] 6-limiting part; 61-limiting bracket; 62-yoke limiting block;

[0036] 7- blocking part;

[0037] 8-Bearings. DETAILED DESCRIPTION

[0038] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Reference Figure 1 As shown, a non-contact motor magnetic braking device includes a motor shaft 1, a motor housing 2 and a magnetic braking device 3, wherein the magnetic braking device 3 includes a static magnetic component 31 and a dynamic magnetic component 32, wherein the static magnetic component 31 is fixedly mounted on the motor housing 2, and the dynamic magnetic component 32 is threadedly connected to the motor shaft 1, and when observing toward the output end of the motor shaft 1, the working rotation direction of the motor shaft 1 is consistent with the thread direction so that the dynamic magnetic component 32 moves in a direction away from the motor, the static magnetic component 31 and the dynamic magnetic component 32 have different polarities and are arranged relative to each other to achieve mutual attraction, and a limiting portion 6 is arranged between the static magnetic component 31 and the dynamic magnetic component 32 to prevent the two from contacting each other.

[0040] In the present invention, when the motor is not working, the dynamic magnetic component 32 will be adsorbed or approach the static magnetic component 31 under the action of magnetic attraction. When the motor shaft 1 attempts to rotate, the position of the dynamic magnetic component 32 changes relative to the static magnetic component 31, and this change causes the direction of the magnetic attraction to form an angle with the rotation direction of the motor shaft 1. This angle causes the magnetic attraction to produce a component perpendicular to the axis of the shaft. Since the direction of this component is perpendicular to the axis of the motor shaft 1, it will generate a resistance torque around the motor shaft 1. The direction of this resistance torque is opposite to the direction in which the motor shaft 1 attempts to rotate. Based on the above principles, the present invention designs a non-contact motor magnetic braking device 3.

[0041] Since the threads on the motor shaft 1 and the dynamic magnetic assembly 32 form a spiral pair, when the motor shaft 1 rotates, it will apply a tangential force to the dynamic magnetic assembly 32, and in the threaded connection, the inclined surface of the thread will convert part of the tangential force into a normal force along the axial direction. Among them, the tangential force is along the tangential direction of the thread, and this tangential force makes the dynamic magnetic assembly 32 move along the thread in the direction away from the motor; the normal force on the inclined surface of the thread ensures that the dynamic magnetic assembly 32 can move along the correct axial path, rather than simply rotating around the motor shaft 1. Therefore, under the combined action of the tangential force and the normal force, the dynamic magnetic assembly 32 can overcome the magnetic attraction between it and the static magnetic assembly 31 and the friction between the threaded connection, so that the dynamic magnetic assembly 32 can move axially on the motor shaft 1.

[0042] When the motor shaft 1 stops working, the dynamic magnetic component 32 will no longer be subject to the outward movement force caused by the threaded connection. And as long as the distance between the two is appropriate, the magnetic attraction between the dynamic magnetic component 32 and the static magnetic component 31 will always exist. Therefore, when the motor shaft 1 stops rotating, the dynamic magnetic component 32 will be affected by the magnetic attraction and move in the direction of the static magnetic component 31, and the closer the two are, the greater the magnetic attraction. When the motor shaft 1 tends to rotate abnormally, the magnetic attraction will generate a resistance torque, and the direction of this resistance torque is opposite to the direction in which the motor shaft 1 is trying to rotate, thereby achieving a braking effect.

[0043] It is worth noting that the presence of the limiter 6 can prevent the dynamic magnetic assembly 32 from directly contacting the static magnetic assembly 31. Due to the magnetic attraction between the two, if there is no limiter 6, the dynamic magnetic assembly 32 may directly hit the static magnetic assembly 31, causing mechanical wear or even damage.

[0044] It should also be noted that in order to enable the dynamic magnetic component 32 to move away from the motor when the motor shaft 1 is working normally, there are two embodiments:

[0045] Embodiment 1: When the motor shaft 1 is working normally, it rotates clockwise (the observer observes from the output end facing the motor shaft), and the threads on the motor shaft 1 and in the dynamic magnetic assembly 32 are both right-hand threads;

[0046] Embodiment 2: When the motor shaft 1 is working normally, it rotates counterclockwise (the observer observes from the output end facing the motor shaft), and the threads on the motor shaft 1 and in the dynamic magnetic assembly 32 are both left-hand threads.

[0047] Furthermore, the static magnetic assembly 31 includes a static magnetic yoke 311 and a static magnet 312 fixedly mounted on one end of the static magnetic yoke 311, the static magnetic yoke 311 is fixedly mounted on the motor housing 2, and the dynamic magnetic assembly 32 includes a dynamic magnetic yoke 321 and a dynamic magnet 322 fixedly mounted on one end of the dynamic magnetic yoke 321, the dynamic magnetic yoke 321 is threadedly connected to the motor shaft 1, and the static magnet 312 and the dynamic magnet 322 have different polarities and are relatively arranged. The static magnetic yoke 311 and the dynamic magnetic yoke 321 can not only support the magnets, but also help guide and concentrate the magnetic field, so that the magnetic attraction is more concentrated, thereby enhancing the braking effect. The static magnet 312 and the dynamic magnet 322 have different polarities and are relatively arranged, which can maximize the effect of the magnetic attraction, thereby improving the braking efficiency.

[0048] Among them, a screw 11 is fixedly mounted on the motor shaft 1, and the moving magnetic yoke 321 is threadedly connected to the screw 11. Since the length of the motor shaft 1 is fixed, when the motor shaft 1 rotates, the moving magnetic yoke 321 will perform a spiral motion on the screw 11. The rotation of the screw 11 can be accurately converted into the axial movement of the moving magnetic yoke 321, thereby realizing the precise control of the position of the moving magnetic yoke 321. Compared with the sliding connection, the threaded connection can more directly and effectively realize the axial movement of the dynamic magnetic assembly 32, which helps to overcome the initial magnetic attraction more quickly, thereby improving the startup efficiency of the equipment. In addition, the threaded connection can also lock the position of the dynamic magnetic assembly 32 after braking is completed to prevent position changes caused by vibration and other reasons, and compared with the general sliding connection, the threaded connection is less prone to wear at the connection.

[0049] Regarding how to realize the function that the moving magnet 322 can reliably and quickly return to the static magnet 312 after the motor shaft 1 stops, the present invention provides the following embodiments:

[0050] Embodiment 1: It also includes an elastic reset component 4, which includes an elastic member 41 and a first positioning member 42. The first positioning member 42 is fixedly mounted on one end of the motor shaft 1 away from the motor housing 2. One end of the elastic member 41 is mounted on the moving magnetic yoke 321, and the other end is mounted on the first positioning member 42. In this way, when the motor is working, the moving magnetic yoke 321 will move in a direction away from the static magnetic yoke 311, and continuously compress the elastic member 41, so that it stores a large amount of elastic potential energy; when the motor stops working, the elastic member 41 releases the stored elastic potential energy, thereby automatically resetting the dynamic magnetic assembly 32 to the initial position. Setting up such a component can avoid the dynamic magnetic assembly 32 from being unable to reset to the vicinity of the static magnetic assembly 31 due to the influence of external interference, thereby preventing the brake system from failing. Among them, the elastic member 41 can be a spring.

[0051] It is worth mentioning that when the motor is working, the dynamic magnetic component 32 moves in the direction away from the static magnetic component 31, then the elastic member 41 will be continuously compressed and give the dynamic magnetic component 32 a resistance, this resistance and the magnetic attraction are in the same direction and opposite to the thrust of the screw 11 to the dynamic magnetic component 32, when the sum of the resistance and the magnetic attraction is the same as the thrust, the dynamic magnetic component 32 can stop axial movement and only rotate with the motor shaft 1. In this way, the function of avoiding the overtravel of the dynamic magnetic component 32 is realized, and the reliability of the device is improved.

[0052] Example 2: Reference Figure 2 As shown, it also includes a magnetic reset component 5, which includes a first magnet 51, a second magnet 52 and a second positioning member 53. The second positioning member 53 is fixedly mounted on the end of the motor shaft 1 away from the motor housing 2, the first magnet 51 is mounted on the moving magnetic yoke 321, and the second magnet 52 is fixedly mounted on the second positioning member 53. The first magnet 51 and the second magnet 52 have the same polarity and are relatively arranged to achieve mutual repulsion. In this way, when the motor stops working, the magnetic reset component 5 automatically resets the dynamic magnetic component 32 to the initial position through the mutual repulsion of the first magnet 51 and the second magnet 52. Compared with the elastic reset component 4, the magnetic reset method reduces mechanical contact and avoids wear caused by contact. Similarly, this solution can also achieve the function of preventing the dynamic magnetic component 32 from overtravel.

[0053] Among them, an elastic stopper 531 is fixedly mounted on the second positioning member 53 to prevent the first magnet 51 and the second magnet 52 from contacting each other, and the elastic stopper 531 is located between the moving magnetic yoke 321 and the second positioning member 53. This arrangement can prevent the moving magnetic yoke 321 from directly and rigidly contacting the second positioning member 53 when the first magnet 51 and the second magnet 52 fail, thereby effectively protecting the device from damage.

[0054] Furthermore, the limiting part 6 includes a limiting bracket 61 and a yoke limiting block 62, the limiting bracket 61 is fixedly mounted on the motor shaft 1, the yoke limiting block 62 is sleeved on the motor shaft 1, the yoke limiting block 62 is fixedly connected to the limiting bracket 61, and the yoke limiting block 62 is located between the static magnetic yoke 311 and the dynamic magnetic yoke 321. In this way, the yoke limiting block 62 can avoid direct contact between the static magnetic component 31 and the dynamic magnetic component 32, and prevent mechanical collision or wear between the two.

[0055] It is worth mentioning that if the static magnetic component 31 and the dynamic magnetic component 32 fit together due to magnetic attraction, a larger current is required to overcome the resistance formed by the magnetic attraction when the motor starts, which may cause excessive starting current, burdening the power supply and the motor itself, and both may also be worn due to instantaneous relative movement. The existence of the limit bracket 61 and the yoke limit block 62 can effectively solve the above problems.

[0056] The limiting bracket 61 and the yoke limiting block 62 are both made of non-magnetic stainless steel. Non-magnetic stainless steel will not be magnetized, thus avoiding interference with the magnetic attraction of the magnet assembly due to material magnetization, ensuring that the brake system works stably in a magnetic field environment; and this also enables the limiting part 6 to work stably for a long time in a harsh environment.

[0057] Furthermore, a blocking portion 7 is also included, and the blocking portion 7 is fixedly mounted on the top of the motor shaft 1. In this way, the blocking portion 7 can prevent the dynamic magnetic component 32 or the elastic reset component 4 or the magnetic reset component 5 from falling off from the motor shaft 1 under extreme conditions (such as vibration or impact), thereby improving safety.

[0058] It should be noted that the blocking part 7 can be a common component such as a retaining spring, a locking nut and a pin on the market, and the fixed connection method with the shaft is also a conventional method, so it will not be described in detail in the present invention.

[0059] Furthermore, it also includes a bearing 8, the outer ring of the bearing 8 is fixedly installed in the motor housing 2, the inner ring of the bearing 8 is fixedly matched with the motor shaft 1, and one end of the limit bracket 61 rests on the inner ring of the bearing 8. One end of the limit bracket 61 rests on the inner ring of the bearing 8, which can ensure that the position of the limit bracket 61 is accurate and fixed, and further avoid displacement when the motor shaft 1 rotates. In addition, the limit bracket 61 also obtains stable support to ensure its stability on the motor shaft 1, especially when the dynamic magnetic component 32 rests on the yoke limit block 62, the stable support obtained by the limit bracket 61 by resting on the inner ring of the bearing 8 is particularly important, which can ensure the stability of the position of the dynamic magnetic component 32 on the limit block, and avoid braking failure caused by the movement of the dynamic magnetic component 32.

[0060] In summary, such a non-contact motor magnetic braking device 3 utilizes the mutual attraction of magnetic forces to achieve the braking effect, and realizes contactless braking of the motor by adopting a static magnetic component 31, a dynamic magnetic component 32 and a limit part 6, thereby reducing the wear problem caused by friction in traditional braking methods and extending the service life of the braking device.

[0061] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A non-contact motor magnetic brake device, comprising a motor shaft (1), a motor housing (2) and a magnetic brake device (3), characterized in that: The magnetic braking device (3) comprises a static magnetic component (31) and a dynamic magnetic component (32); the static magnetic component (31) is fixedly mounted on the motor housing (2); the dynamic magnetic component (32) is threadedly connected to the motor shaft (1); when viewed from the output end of the motor shaft (1), the working rotation direction of the motor shaft (1) is consistent with the thread direction so that the dynamic magnetic component (32) moves in a direction away from the motor; the static magnetic component (31) and the dynamic magnetic component (32) have different polarities and are arranged relative to each other to achieve mutual attraction; a limiting portion (6) is arranged between the static magnetic component (31) and the dynamic magnetic component (32) to prevent the two from contacting each other.

2. The non-contact motor magnetic brake device according to claim 1, characterized in that: The static magnetic force component (31) comprises a static magnetic yoke (311) and a static magnet (312) fixedly mounted on one end of the static magnetic yoke (311); the static magnetic yoke (311) is fixedly mounted on a motor housing (2); the dynamic magnetic force component (32) comprises a dynamic magnetic yoke (321) and a dynamic magnet (322) fixedly mounted on one end of the dynamic magnetic yoke (321); the dynamic magnetic yoke (321) is threadedly connected to a motor shaft (1); the static magnet (312) and the dynamic magnet (322) have different polarities and are arranged relative to each other.

3. The non-contact motor magnetic brake device according to claim 2, characterized in that: A screw rod (11) is fixedly mounted on the motor shaft (1), and the moving magnetic yoke (321) is threadedly connected to the screw rod (11).

4. The non-contact motor magnetic brake device according to claim 2, characterized in that: The invention also comprises an elastic reset assembly (4), wherein the elastic reset assembly (4) comprises an elastic member (41) and a first positioning member (42), wherein the first positioning member (42) is fixedly mounted on one end of the motor shaft (1) away from the motor housing (2), and one end of the elastic member (41) is mounted on the moving magnetic yoke (321), and the other end is mounted on the first positioning member (42).

5. The non-contact motor magnetic brake device according to claim 2, characterized in that: The invention also comprises a magnetic reset assembly (5), wherein the magnetic reset assembly (5) comprises a first magnet (51), a second magnet (52) and a second positioning member (53), wherein the second positioning member (53) is fixedly mounted on an end of the motor shaft (1) away from the motor housing (2), the first magnet (51) is mounted on a moving magnetic yoke (321), and the second magnet (52) is fixedly mounted on the second positioning member (53), and the first magnet (51) and the second magnet (52) have the same polarity and are arranged relative to each other to achieve mutual repulsion.

6. The non-contact motor magnetic brake device according to claim 5, characterized in that: An elastic limiting block (531) is fixedly mounted on the second positioning member (53) to prevent the first magnet (51) and the second magnet (52) from contacting each other. The elastic limiting block (531) is located between the moving magnetic yoke (321) and the second positioning member (53).

7. The non-contact motor magnetic brake device according to claim 2, characterized in that: The limiting part (6) comprises a limiting bracket (61) and a yoke limiting block (62); the limiting bracket (61) is fixedly mounted on the motor shaft (1); the yoke limiting block (62) is sleeved on the motor shaft (1); the yoke limiting block (62) is fixedly connected to the limiting bracket (61); and the yoke limiting block (62) is located between the static magnetic yoke (311) and the dynamic magnetic yoke (321).

8. The non-contact motor magnetic brake device according to claim 7, characterized in that: The limiting bracket (61) and the yoke limiting block (62) are both made of non-magnetic stainless steel.

9. The non-contact motor magnetic brake device according to claim 1, characterized in that: It also comprises a blocking portion (7), wherein the blocking portion (7) is fixedly mounted on the top end of the motor shaft (1).

10. The non-contact motor magnetic brake device according to claim 7, characterized in that: It also includes a bearing (8), the outer ring of the bearing (8) is fixedly installed in the motor housing (2), the inner ring of the bearing (8) is fixedly matched with the motor shaft (1), and one end of the limit bracket (61) is supported on the inner ring of the bearing (8).

Images