Linear actuator
By employing a linear motor design with a first stator assembly and a second stator assembly in the electric actuator, the cost and complexity issues of traditional electric actuators when stroke requirements change are solved, achieving flexible stroke adjustment and improved stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DAHUAN ROBOTICS TECHNOLOGY CO LTD
- Filing Date
- 2025-04-28
- Publication Date
- 2026-05-01
AI Technical Summary
Traditional electric actuators require motors with larger strokes to meet different stroke requirements, which increases the size and weight of the motor, increases manufacturing costs, and makes replacing the internal motor complicated and prone to damaging other components.
The linear motor design includes a first stator assembly and a second stator assembly. The stroke can be changed by disassembling or replacing the second stator assembly, avoiding the complexity of disassembly and assembly and damage to parts, thus ensuring the stability and accuracy of the linear drive.
It enables flexible adjustment of the stroke, reduces manufacturing costs, improves the stability and accuracy of linear drive, and simplifies the motor replacement process.
Smart Images
Figure CN224191812U_ABST
Abstract
Description
Linear actuator Technical Field
[0001] This application relates to the field of actuators, and more particularly to a linear actuator. Background Technology
[0002] Electric actuators, as important drive devices, are widely used in industrial automation, robotics, smart homes, aerospace, and other fields. Their core function is to drive a mover with a motor to complete a specific stroke, thereby achieving precise control of the target equipment.
[0003] In traditional electric actuator designs, the motor typically employs a structure with one stator and one mover, using an electromagnetic field to drive the mover to achieve linear motion. This design can meet basic drive requirements in a single application scenario, but when faced with different stroke requirements, it is often necessary to select a motor with a larger stroke to accommodate the maximum stroke requirement.
[0004] However, while using a motor with a larger stroke can meet the maximum stroke requirement, it will increase the size and weight of the motor, thereby increasing manufacturing costs and the overall cost of the equipment.
[0005] In addition, when the same actuator faces greater stroke requirements, it is generally necessary to replace the internal motor. However, the internal structure of actuators is quite complex, and it is difficult and time-consuming to disassemble and assemble an entire motor, which can easily damage other internal components. Summary of the Invention
[0006] This application provides a linear actuator, including a housing, a linear motor, a sliding frame, and an actuator. The linear motor and the sliding frame are disposed in the housing. The housing has a through hole corresponding to the actuator, through which the actuator extends out of the housing. The sliding frame is connected to the actuator. The linear motor includes a mover assembly, a first stator assembly, and a second stator assembly. The first stator assembly and the second stator assembly are respectively connected to the housing and are arranged sequentially along a straight line. The sliding frame is connected to the mover assembly. The mover assembly is at least partially located within the first stator assembly or the second stator assembly. The actuator is located on the same side of the first stator assembly and the second stator assembly. The mover assembly can move within the first stator assembly and / or the second stator assembly. The sliding frame follows the mover assembly and drives the actuator to move linearly.
[0007] In some embodiments, the length of the first stator assembly along the straight line is greater than the length of the second stator assembly along the straight line.
[0008] In some embodiments, the number of magnets in the first stator assembly is 0.2 to 0.3 times the number of magnets in the second stator assembly.
[0009] In some embodiments, the distance between the first stator assembly and the second stator assembly is a first distance, the distance between two adjacent magnets in the first stator assembly or the distance between two adjacent magnets in the second stator assembly is a second distance, and the first distance is greater than the second distance.
[0010] In some embodiments, the first spacing is 0.1-0.4 times the second spacing.
[0011] In some embodiments, the first stator assembly includes a first upper yoke, a first lower yoke, a first support member, and a plurality of first magnets. The first upper yoke and the first lower yoke are arranged at intervals. The first support member is located between the first upper yoke and the first lower yoke and is connected to the first upper yoke and the first lower yoke, respectively. The first magnets are disposed on the surface of the first upper yoke facing the first lower yoke, and the first magnets are disposed on the surface of the first lower yoke facing the first upper yoke. A first receiving space is formed between the first magnets disposed on the first upper yoke and the first magnets disposed on the first lower yoke, and the first receiving space is used to receive the mover. The second stator assembly includes a second upper yoke, a second lower yoke, a second support member, and a plurality of second magnets. The second upper yoke and the second lower yoke are arranged at intervals. The second support member is located between the second upper yoke and the second lower yoke and is connected to the second upper yoke and the second lower yoke respectively. The second magnets are disposed on the surface of the second upper yoke facing the second lower yoke, and the second magnets are disposed on the surface of the second lower yoke facing the second upper yoke. A second receiving space is formed between the second magnets disposed on the second upper yoke and the second magnets disposed on the second lower yoke. The second receiving space is used to receive the mover assembly.
[0012] In some embodiments, the first support member has a first groove facing the first receiving space, and the second support member has a second groove facing the second receiving space.
[0013] In some embodiments, the first support member is connected to the first upper yoke and the first lower yoke via a first connector, and the second support member is connected to the second upper yoke and the second lower yoke via a second support member.
[0014] In some embodiments, the first support member is further connected to the side of the housing away from the actuator via a third connector, and the second support member is connected to the side of the housing away from the actuator via a fourth connector.
[0015] In some embodiments, mounting holes are provided on the sides of the housing, and the first stator assembly and the second stator assembly are both installed in the mounting holes and exposed outward through the mounting holes.
[0016] Compared with the prior art, since the linear actuator in the embodiment of this application includes a first stator assembly and a second stator assembly, the stroke of the linear motor can be changed by disassembling and assembling the second stator assembly, or by replacing the second stator assembly with a different stroke length. Thus, the stroke of the linear actuator in the embodiment of this application can be changed without disassembling the stator assembly. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 is a three-dimensional structural diagram of a linear actuator according to an embodiment of this application.
[0019] Figure 2 is a schematic diagram of the planar structure of the linear actuator shown in Figure 1 behind the hidden housing.
[0020] Figure 3 is a three-dimensional structural diagram of a linear motor according to an embodiment of this application.
[0021] Figure 4 is an exploded view of a linear motor according to an embodiment of this application. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0025] First, in the description of the embodiments of this application, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0026] Secondly, the terms "first," "second," and "third" are used only to distinguish descriptions and have no order or distinction of importance. They should not be interpreted as indicating or implying relative importance. Features marked "first" or "second" may explicitly or implicitly include one or more of the same feature.
[0027] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted; the term "along a certain direction" does not imply that it must be absolutely parallel to that direction, but can be offset, that is, it can have a component in that direction.
[0028] Furthermore, it should be noted in the description of this application that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, an electromagnetic connection, or even a communication connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0029] Furthermore, in this application, "and / or," such as "feature 1 and / or feature 2," refers to three possibilities: feature 1 alone, feature 2 alone, or feature 1 plus feature 2.
[0030] Referring to Figures 1-2, the linear actuator 100 of this embodiment includes a housing 10, a linear motor 20, a sliding frame 40, and an actuator 30. The linear motor 20 and the sliding frame 40 are disposed in the housing 10. The housing 10 has a through hole 10a corresponding to the actuator 30, through which the actuator 30 extends out of the housing 10. The sliding frame 40 and the actuator 30 are connected. The linear motor 20 includes a mover assembly 21, a first stator assembly 22, and a second stator assembly 23. The first stator assembly 22 and the second stator assembly 23... The first stator assembly 22 and the second stator assembly 23 are respectively connected to the housing 10. The first stator assembly 22 and the second stator assembly 23 are arranged sequentially in a straight line. The sliding frame 40 is respectively connected to the moving part assembly 21. The moving part assembly 21 is at least partially located in the first stator assembly 22 or the second stator assembly 23. The actuator 30 is located on the same side of the first stator assembly 22 and the second stator assembly 23. The moving part assembly 21 can move in the first stator assembly 22 and / or the second stator assembly 23. The sliding frame 40 follows the moving part assembly 21 and drives the actuator 30 to move linearly.
[0031] In some embodiments, the length of the first stator assembly 22 along the straight direction is greater than the length of the second stator assembly 23 along the straight direction, so that the stroke driven by the first stator assembly 22 is greater than the stroke driven by the second stator assembly 23. This avoids the significant impact on the linear drive caused by the inaccurate positioning of the second stator assembly 23 due to disassembly and assembly, and ensures the stability of the linear drive of the linear driver 100 of this application.
[0032] As shown in Figures 3 and 4, in some embodiments, the number of magnets 224 in the first stator assembly 22 is 0.2 to 0.3 times the number of magnets 234 in the second stator assembly 23, further ensuring that the inaccurate positioning of the second stator assembly 2 due to the disassembly and assembly of the second stator assembly 23 will not affect the stability of the linear drive of the linear driver 100.
[0033] As shown in Figures 3 and 4, in some embodiments, the distance between the first stator assembly 22 and the second stator assembly 23 is a first distance, and the distance between two adjacent magnets 224 in the first stator assembly 22 or the distance between two adjacent magnets 234 in the second stator assembly 23 is a second distance. The first distance is greater than the second distance to ensure the smoothness of the mover assembly 21 when passing through the gap between the first stator assembly 22 and the second stator assembly 23, and to reduce the change in the driving magnetic field caused by the gap. Of course, in other embodiments, the second distance is the distance between two adjacent magnets 234 in the second stator assembly 23, but it is not limited to this.
[0034] In some embodiments, the first spacing is 0.1-0.4 times the second spacing. While providing space for assembly errors, this further ensures the smoothness of the mover assembly 21 when passing through the gap between the first stator assembly 22 and the second stator assembly 23, and reduces the change in the driving magnetic field caused by the gap.
[0035] As shown in Figures 3 and 4, in some embodiments, the first stator assembly 22 includes a first upper yoke 221, a first lower yoke 222, a first support member 223, and a plurality of first magnets 224. The first upper yoke 221 and the first lower yoke 222 are arranged at intervals, and the first support member 223 is located between the first upper yoke 221 and the first lower yoke 222. The first support member 223 is connected to the first upper yoke 221 and the first lower yoke 222 so as to facilitate the installation of the first stator assembly 22 in the housing 100 and to facilitate the assembly of the first stator assembly 22 itself, which helps to reduce manufacturing costs.
[0036] The first magnet 224 is disposed on the surface of the first upper yoke 221 facing the first lower yoke 222, and the first magnet 224 is disposed on the surface of the first lower yoke 222 facing the first upper yoke 221. A first receiving space 224a is formed between the first magnet 224 disposed on the first upper yoke 221 and the first magnet 224 disposed on the first lower yoke 222. The first receiving space 224a is used to receive the mover assembly 21, thereby ensuring the magnetic drive effect of the first magnet 224 on the mover assembly 21 and making the structure of the first stator assembly 22 compact and reasonable.
[0037] As shown in Figures 3 and 4, in some embodiments, the second stator assembly 23 includes a second upper yoke 231, a second lower yoke 232, a second support member 233, and a plurality of second magnets 234. The second upper yoke 231 and the second lower yoke 232 are arranged at intervals, and the second support member 233 is located between the second upper yoke 231 and the second lower yoke 232. The second support member 233 is connected to the second upper yoke 231 and the second lower yoke 232 to facilitate the installation of the second stator assembly 23 in the housing 100 and to facilitate the assembly of the second stator assembly 23 itself, which helps to reduce manufacturing costs.
[0038] As shown in Figures 3 and 4, in some embodiments, the second magnet 234 is disposed on the surface of the second upper yoke 231 facing the second lower yoke 232, and the second magnet 234 is disposed on the surface of the second lower yoke 232 facing the second upper yoke 231. A second receiving space 234a is formed between the second magnet 234 disposed on the second upper yoke 231 and the second magnet 234 disposed on the second lower yoke 232. The second receiving space 234a is used to accommodate the mover assembly 21, thereby ensuring the magnetic drive effect of the second magnet 234 on the mover assembly 21 and making the structure of the second stator assembly 23 compact and reasonable.
[0039] As shown in Figures 3 and 4, in some embodiments, the first support member 223 has a first groove 223a facing the first receiving space 224a to provide movement space and clearance for the mover assembly 21, which is beneficial to reducing the size of the linear motor 20; the second support member 233 has a second groove 234a facing the second receiving space 234a to provide movement space and clearance for the mover assembly 21, which is beneficial to reducing the size of the linear motor 20.
[0040] As shown in Figures 3 and 4, in some embodiments, the first support member 223 is connected to the first upper magnetic yoke 221 and the first lower magnetic yoke 222 via the first connector 225, and the second support member 233 is connected to the second upper magnetic yoke 231 and the second lower magnetic yoke 232 via the second support member 233, so as to improve the ease of assembly of the first stator assembly 22 and the second stator assembly 23.
[0041] As shown in Figures 3 and 4, in some embodiments, the first support member 223 is also connected to the side of the housing 10 away from the actuator 30 via the third connector 226, and the second support member 233 is connected to the side of the housing 10 away from the actuator 30 via the fourth connector 236, so as to realize the connection between the first stator assembly 22, the second stator assembly 23 and the housing 10, and improve the compactness and rationality of the structure.
[0042] As shown in Figures 3 and 4, in some embodiments, mounting holes 10b are provided on the side of the housing 10. The first stator assembly 22 and the second stator assembly 23 are installed in the mounting holes 10b and exposed to the outside through the mounting holes 10b, which helps to reduce the thickness of the linear actuator 100 and facilitate the disassembly, assembly, and observation of the first stator assembly 22 and the second stator assembly 23.
[0043] It should be noted that in the attached diagram, the direction pointed to by arrow L is the straight line direction mentioned above, but it is not limited to this.
[0044] Compared with the prior art, since the linear actuator 100 in this application embodiment includes a first stator assembly 22 and a second stator assembly 23, the stroke of the linear motor 20 can be changed by disassembling and assembling the second stator assembly 23, or by replacing the second stator assembly 23 with a different stroke length. Thus, the stroke of the linear actuator 100 in this application embodiment can be changed without disassembling the stator assembly.
[0045] The above-disclosed examples are merely preferred embodiments of this application, intended to facilitate understanding and implementation by those skilled in the art. However, they cannot be used to limit the scope of this application. Therefore, equivalent variations made within the scope of this application are still within the scope of this application.
Claims
1. A linear actuator, characterized in that, The device includes a housing, a linear motor, an actuator, and a sliding frame. The linear motor and the sliding frame are disposed in the housing. The housing has a through hole corresponding to the actuator, through which the actuator extends out of the housing. The sliding frame is connected to the actuator. The linear motor includes a mover assembly, a first stator assembly, and a second stator assembly. The first stator assembly and the second stator assembly are respectively connected to the housing and are arranged sequentially in a straight line. The sliding frame is connected to the mover assembly. The mover assembly is at least partially located within the first stator assembly or the second stator assembly. The actuator is located on the same side of the first stator assembly and the second stator assembly. The mover assembly can move within the first stator assembly and / or the second stator assembly. The sliding frame follows the movement of the mover assembly and drives the actuator to move linearly.
2. The linear actuator as described in claim 1, characterized in that, The length of the first stator assembly along the straight line is greater than the length of the second stator assembly along the straight line.
3. The linear actuator as described in claim 1, characterized in that, The number of magnets in the first stator assembly is 0.2 to 0.3 times the number of magnets in the second stator assembly.
4. The linear actuator as described in claim 1, characterized in that, The distance between the first stator assembly and the second stator assembly is the first distance, and the distance between two adjacent magnets in the first stator assembly or between two adjacent magnets in the second stator assembly is the second distance, wherein the first distance is greater than the second distance.
5. The linear actuator as described in claim 4, characterized in that, The first spacing is 0.1-0.4 times the second spacing.
6. The linear actuator as claimed in claim 1, characterized in that, The first stator assembly includes a first upper yoke, a first lower yoke, a first support member, and a plurality of first magnets. The first upper yoke and the first lower yoke are arranged at intervals. The first support member is located between the first upper yoke and the first lower yoke and is connected to the first upper yoke and the first lower yoke respectively. The first magnets are disposed on the surface of the first upper yoke facing the first lower yoke, and the first magnets are disposed on the surface of the first lower yoke facing the first upper yoke. A first receiving space is formed between the first magnets disposed on the first upper yoke and the first magnets disposed on the first lower yoke, and the first receiving space is used to receive the mover assembly. The second stator assembly includes a second upper yoke, a second lower yoke, a second support member, and a plurality of second magnets. The second upper yoke and the second lower yoke are arranged at intervals. The second support member and the second magnets are located between the second upper yoke and the second lower yoke and are respectively connected to the second upper yoke and the second lower yoke. The second magnets are disposed on the surface of the second upper yoke facing the second lower yoke, and the second magnets are disposed on the surface of the second lower yoke facing the second upper yoke. A second receiving space is formed between the second magnets disposed on the second upper yoke and the second magnets disposed on the second lower yoke. The second receiving space is used to receive the mover assembly.
7. The linear actuator as described in claim 6, characterized in that, The first support member has a first groove facing the first receiving space, and the second support member has a second groove facing the second receiving space.
8. The linear actuator as described in claim 6, characterized in that, The first support member is connected to the first upper yoke and the first lower yoke via a first connector, and the second support member is connected to the second upper yoke and the second lower yoke via a second support member.
9. The linear actuator as claimed in claim 6, characterized in that, The first support member is also connected to the side of the housing away from the actuator via a third connector, and the second support member is connected to the side of the housing away from the actuator via a fourth connector.
10. The linear actuator as claimed in claim 1, characterized in that, Mounting holes are provided on the sides of the housing. The first stator assembly and the second stator assembly are both installed in the mounting holes and exposed to the outside through the mounting holes.