Self-locking electric actuator

Abstract

The utility model relates to the field of electric actuators, and provides a self-locking electric actuator which comprises a rotor, a stator, first magnetic steel and second magnetic steel. The number of the first magnetic steels is multiple, the multiple first magnetic steels are all installed on the rotor, and the multiple first magnetic steels are arranged around the central axis of the rotor at intervals; the number of the second magnetic steels is multiple, the multiple second magnetic steels are all installed on the stator, and the multiple second magnetic steels are arranged around the central axis of the stator at intervals; the opposite ends of the first magnetic steel and the second magnetic steel are special-shaped magnetic poles. The electric actuator has the advantages that mechanical abrasion of the electric actuator is reduced, and the failure rate of the electric actuator is reduced.

Description

Technical Field

[0001] This application relates to the field of electric actuators, and more particularly to a self-locking electric actuator. Background Technology

[0002] Traditional self-locking electric actuators are generally divided into two types: the first type uses the principle of worm gear self-locking; the second type uses the brake self-locking method, which achieves the purpose of self-locking by applying braking force through the drive shaft or the power output. The usual method of brake self-locking is mechanical braking, which uses mechanical friction to achieve the purpose of brake self-locking.

[0003] However, worm gear self-locking is only suitable for situations where the worm gear reduction is relatively large, and its self-locking performance gradually decreases as the electric actuator is used for longer periods. Traditional brake self-locking suffers from two problems: firstly, the self-locking torque decreases due to wear of the mechanical brake; secondly, wear of the mechanical brake leads to the accumulation of wear debris and other particles inside the motor, increasing the motor's failure rate. Utility Model Content

[0004] In order to improve upon the aforementioned shortcomings of self-locking electric actuators that employ transmission brake self-locking, this application provides a self-locking electric actuator.

[0005] The self-locking electric actuator provided in this application adopts the following technical solution:

[0006] A self-locking electric actuator includes a rotor, a stator, a first magnet, and a second magnet; multiple first magnets are provided, each mounted on the rotor, and the multiple first magnets are arranged at intervals around the central axis of the rotor; multiple second magnets are provided, each mounted on the stator, and the multiple second magnets are arranged at intervals around the central axis of the stator; the ends of the first magnets and the second magnets opposite to each other are irregularly shaped magnetic poles.

[0007] By adopting the above technical solution, magnetic resistance is used as the torque source, which reduces the mechanical wear of the electric actuator and lowers the failure rate of the electric actuator. In addition, the magnetic force of the magnet changes little, which can improve the problem of reduced self-locking torque caused by wear against the mechanical brake in traditional brake self-locking.

[0008] Optionally, the first magnet is an electromagnet.

[0009] By adopting the above technical solution, the magnitude of the self-locking torque of the electric actuator can be adjusted by adjusting the magnetic strength of the first magnet, making the operation simple and convenient.

[0010] Optionally, the second magnet is an electromagnet.

[0011] By adopting the above technical solution, the self-locking torque of the electric actuator can be adjusted by adjusting the magnetic strength of the second magnet, making the operation simple and convenient.

[0012] Optionally, the rotor has a plurality of first mounting cavities inside, and the first magnet is installed in the first mounting cavity. The plurality of first mounting cavities correspond one-to-one with the plurality of first magnets. The first mounting cavities extend along the length direction of the rotor, and the length of the first mounting cavity is greater than the length of the first magnet.

[0013] By adopting the above technical solution, the distance between the first magnet and the second magnet can be adjusted by adjusting the position of the first magnet in the first mounting cavity, thereby adjusting the magnitude of the self-locking torque and improving the flexibility of the self-locking electric actuator.

[0014] Optionally, the stator has a plurality of second mounting cavities inside, and the second magnet rod is installed in the second mounting cavity. The plurality of second mounting cavities correspond one-to-one with the plurality of second magnets. The second mounting cavities extend along the length direction of the rotor, and the length of the second mounting cavity is greater than the length of the second magnet.

[0015] By adopting the above technical solution, the distance between the second magnet and the first magnet can be adjusted by adjusting the position of the second magnet in the second mounting cavity, thereby adjusting the magnitude of the self-locking torque and improving the flexibility of the self-locking electric actuator.

[0016] Optionally, the rotor has an adjustment cavity inside, which extends along the length of the rotor and is coaxial with the rotor; the rotor has a communicating cavity, and the adjustment cavity communicates with the first mounting cavity through the communicating cavity; an adjustment screw is provided in the adjustment cavity, which is coaxial with the rotor; a connecting cylinder and an adjustment sleeve are provided around the adjustment screw, and the adjustment sleeve is rotatably connected to the end of the connecting cylinder near the stator; the adjustment sleeve and the adjustment screw are threadedly connected; multiple connecting rods are provided around the connecting cylinder, and the end of the connecting rod away from the connecting cylinder is connected to the first magnet.

[0017] By adopting the above technical solution, when adjusting the distance between the first magnet and the second magnet, the adjusting cylinder is turned relative to the adjusting screw, and the adjusting cylinder drives the connecting cylinder to move along the length direction of the adjusting screw. In turn, multiple connecting rods drive multiple first magnets to move along the length direction of the first mounting cavity, thereby realizing the adjustment of the distance between the first magnet and the second magnet.

[0018] Optionally, the adjusting screw has a polygonal groove at one end near the stator, and the center point of the polygonal groove is located on the central axis of the rotor; the polygonal groove is used for the insertion of the polygonal cylinder.

[0019] By adopting the above technical solution, when rotating the adjusting screw, the polygonal cylinder is inserted into the polygonal groove, and the polygonal cylinder drives the adjusting screw to rotate, thereby improving the convenience of rotating the adjusting screw.

[0020] Optionally, it also includes a clamp, which is magnetic, and the rotor is fitted onto the clamp.

[0021] By adopting the above technical solution, when adjusting the position of the first magnet in the first mounting cavity, the clamp is first placed on the outer periphery of the rotor, and then the clamp is moved relative to the rotor. The magnetic clamp drives multiple first magnets to move simultaneously, so that the movement of the first magnet in the first mounting cavity can be achieved when it is inconvenient to disassemble the rotor and stator.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By setting a first magnet in the rotor and a second magnet in the stator, the magnetic resistance between the first magnet and the second magnet is used as a torque source, thereby reducing the mechanical wear of the electric actuator, reducing the failure rate of the electric actuator, and improving the problem of reduced self-locking torque caused by wear on the mechanical brake in traditional brake self-locking.

[0024] 2. By setting a first mounting cavity on the rotor, and the length of the first mounting cavity is greater than the length of the first magnet, the distance between the first magnet and the second magnet is adjustable, so as to adjust the self-locking torque and improve the flexibility of use of the self-locking electric actuator;

[0025] 3. By fitting a magnetic clamp around the outer periphery of the rotor, the position of the first magnet in the first mounting cavity can be moved, thereby improving the convenience of adjusting the self-locking torque. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application.

[0027] Figure 2 This is a schematic diagram illustrating the setting position of the adjusting screw in Embodiment 1.

[0028] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this application.

[0029] Figure 4 This is a schematic diagram used to illustrate the state of the clamp sleeved on the rotor in Embodiment 2.

[0030] Explanation of reference numerals in the attached drawings: 1. Rotor; 11. First mounting cavity; 12. Adjusting cavity; 13. Connecting cavity; 14. Adjusting screw; 15. Adjusting screw barrel; 151. Polygonal groove; 16. Connecting cylinder; 161. Connecting rod; 2. Stator; 21. Second mounting cavity; 3. First magnet; 4. Second magnet; 5. Clamp. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0032] This application discloses a self-locking electric actuator.

[0033] Example 1

[0034] Reference Figure 1 and Figure 2 A self-locking electric actuator includes a rotor 1, a stator 2, first magnets 3, and second magnets 4. Multiple first magnets 3 are provided, each mounted on the rotor 1 and arranged at intervals around the central axis of the rotor 1. Multiple second magnets 4 are provided, each mounted on the stator 2 and arranged at intervals around the central axis of the stator 2. The ends of the first magnets 3 and second magnets 4 opposite to each other are irregularly shaped magnetic poles. This utilizes magnetic resistance as a torque source, reducing mechanical wear and lowering the failure rate of the electric actuator. Furthermore, the magnetic force variation of the magnets is small, which can improve the problem of reduced self-locking torque caused by wear against the mechanical brake in traditional self-locking brakes.

[0035] In this embodiment, both the first magnet 3 and the second magnet 4 are high-temperature resistant magnets, such as samarium cobalt permanent magnets, AlNiCo magnets, etc., to reduce the change in magnetic force of the magnets.

[0036] In this embodiment, the rotor 1 has a plurality of first mounting cavities 11 inside, and the first magnet 3 is installed in the first mounting cavity 11. The first magnet 3 can slide along the length direction of the first mounting cavity 11, and the plurality of first mounting cavities 11 correspond one-to-one with the plurality of first magnets 3. The first mounting cavity 11 extends along the length direction of the rotor 1, and the length of the first mounting cavity 11 is greater than the length of the first magnet 3.

[0037] The rotor 1 has an adjustment cavity 12 inside, which extends along the length of the rotor 1 and is coaxial with the rotor 1. The rotor 1 has a connecting cavity 13, through which the adjustment cavity 12 communicates with the first mounting cavity 11. An adjustment screw 14 is provided in the adjustment cavity 12, which is coaxial with the rotor 1. A connecting cylinder 16 and an adjustment sleeve 15 are sleeved on the adjustment screw 14. The adjustment sleeve 15 is rotatably connected to the end of the connecting cylinder 16 near the stator 2, and the adjustment sleeve 15 is threadedly connected to the adjustment screw 14. Multiple connecting rods 161 are provided around the periphery of the connecting cylinder 16, and the end of the connecting rod 161 away from the connecting cylinder 16 is connected to the first magnet 3.

[0038] The distance between the first magnet 3 and the second magnet 4 can be adjusted by adjusting the position of the first magnet 3 in the rotor 1, thereby adjusting the magnitude of the self-locking torque of the electric actuator. Specifically, the adjustment method is as follows: The adjusting screw 15 is turned relative to the adjusting screw 14, causing the adjusting screw 15 to move the connecting cylinder 16 along the length of the adjusting screw 14. This, in turn, causes multiple connecting rods 161 to move multiple first magnets 3 along the length of the first mounting cavity 11, thus adjusting the distance between the first magnet 3 and the second magnet 4.

[0039] Furthermore, in this embodiment, a plurality of second mounting cavities 21 are formed inside the stator 2, and the second magnets 4 are mounted in the second mounting cavities 21, with each of the plurality of second mounting cavities 21 corresponding to a plurality of second magnets 4. The second mounting cavities 21 extend along the length direction of the rotor 1, and the length of the second mounting cavity 21 is greater than the length of the second magnet 4, thereby allowing the second magnets 4 to move along the length direction of the second mounting cavity 21. The distance between the first magnet 3 and the second magnet 4 can be adjusted by moving the second magnets 4 relative to the second mounting cavities 21.

[0040] With the second mounting cavity 21 provided, a gripping rod is fixedly connected to the end of the second magnet 4 near the first magnet 3 to facilitate operation by the staff.

[0041] Furthermore, a polygonal groove 151 is formed at the end of the adjusting screw 15 near the stator 2. The center point of the polygonal groove 151 is located on the central axis of the rotor 1. The polygonal groove 151 is used for inserting the polygonal cylinder. When rotating the adjusting screw 15, the polygonal cylinder is inserted into the polygonal groove 151, and the polygonal cylinder drives the adjusting screw 15 to rotate, improving the convenience of rotating the adjusting screw 15.

[0042] In other embodiments, the first magnet 3 may also be an electromagnet, and the magnitude of the self-locking torque of the electric actuator can be adjusted by adjusting the magnetic strength of the first magnet 3.

[0043] It is understood that in other embodiments, the second magnet 4 may also be an electromagnet, and the magnitude of the self-locking torque of the electric actuator can be adjusted by adjusting the magnetic strength of the second magnet 4.

[0044] The implementation principle of Example 1 is as follows: by setting a first magnet 3 in the rotor 1 and a second magnet 4 in the stator 2, the magnetic resistance between the first magnet 3 and the second magnet 4 is used as the torque source, thereby reducing the mechanical wear of the electric actuator, reducing the failure rate of the electric actuator, and improving the problem of reduced self-locking torque caused by wear of the mechanical brake in traditional brake self-locking.

[0045] When it is necessary to adjust the self-locking torque, insert the polygonal cylinder into the polygonal groove 151, drive the adjusting screw cylinder 15 to rotate, thereby driving the connecting cylinder 16 to move along the length direction of the adjusting screw 14, and then driving the first magnet 3 to move along the length direction of the first mounting cavity 11, so as to realize the adjustment of the distance between the first magnet 3 and the second magnet 4, and thus realize the adjustment of the self-locking torque.

[0046] Example 2

[0047] Reference Figure 3 and Figure 4 The difference between this embodiment and embodiment 1 is that a self-locking electric actuator also includes a clamp 5, which is magnetic, and the rotor 1 is fitted with the clamp 5.

[0048] When it is necessary to adjust the position of the first magnet 3, the magnetic clamp 5 is fitted around the outer periphery of the rotor 1, and the first magnet 3 is moved by moving the clamp 5, which improves the ease of operation.

[0049] It is understandable that when the position of the first magnet 3 is adjusted using the clamp 5, the adjustment cavity, adjustment screw, adjustment cylinder, connecting cylinder and connecting rod do not need to be set inside the rotor.

[0050] Among them, the clamp 5 can be magnetic or an electromagnet.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A self-locking electric actuator, characterized in that: It includes a rotor (1), a stator (2), a first magnet (3) and a second magnet (4); multiple first magnets (3) are provided, and multiple first magnets (3) are installed on the rotor (1), and multiple first magnets (3) are arranged at intervals around the central axis of the rotor (1); multiple second magnets (4) are provided, and multiple second magnets (4) are installed on the stator (2), and multiple second magnets (4) are arranged at intervals around the central axis of the stator (2); the ends of the first magnets (3) and the second magnets (4) opposite to each other are irregular magnetic poles.

2. The self-locking electric actuator according to claim 1, characterized in that: The first magnet (3) is an electromagnet.

3. A self-locking electric actuator according to claim 1 or 2, characterized in that: The second magnet (4) is an electromagnet.

4. A self-locking electric actuator according to claim 1, characterized in that: The rotor (1) has a plurality of first mounting cavities (11) inside, and the first magnet (3) is installed in the first mounting cavity (11). The plurality of first mounting cavities (11) correspond one-to-one with the plurality of first magnets (3). The first mounting cavity (11) extends along the length direction of the rotor (1), and the length of the first mounting cavity (11) is greater than the length of the first magnet (3).

5. A self-locking electric actuator according to claim 1 or 4, characterized in that: The stator (2) has a plurality of second mounting cavities (21) inside, and the second magnet (4) rod is installed in the second mounting cavity (21). The plurality of second mounting cavities (21) correspond one-to-one with the plurality of second magnets (4). The second mounting cavity (21) extends along the length direction of the rotor (1), and the length of the second mounting cavity (21) is greater than the length of the second magnet (4).

6. A self-locking electric actuator according to claim 4, characterized in that: The rotor (1) has an adjustment cavity (12) inside, which extends along the length of the rotor (1) and is coaxial with the rotor (1). The rotor (1) has a connecting cavity (13), and the adjustment cavity (12) is connected to the first mounting cavity (11) through the connecting cavity (13). An adjustment screw (14) is provided in the adjustment cavity (12), which is coaxial with the rotor (1). The adjustment screw (14) is fitted with a connecting cylinder (16) and an adjustment cylinder (15). The adjustment cylinder (15) is rotatably connected to the end of the connecting cylinder (16) near the stator (2), and the adjustment cylinder (15) is threadedly connected to the adjustment screw (14). Multiple connecting rods (161) are provided on the periphery of the connecting cylinder (16), and the end of the connecting rod (161) away from the connecting cylinder (16) is connected to the first magnet (3).

7. A self-locking electric actuator according to claim 6, characterized in that: The adjusting screw (15) has a polygonal groove (151) at one end near the stator (2), and the center point of the polygonal groove (151) is located on the central axis of the rotor (1); the polygonal groove (151) is used for the insertion of the polygonal screw.

8. A self-locking electric actuator according to claim 4, characterized in that: It also includes a clamp (5), which is magnetic, and the rotor (1) is fitted onto the clamp (5).

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