A cylindrical linear motor with high positioning accuracy

Abstract

The present invention belongs to the technical field of tubular linear motors, and relates to a high positioning precision cylindrical linear motor, comprising a stator and a tubular mover, wherein the stator is sleeved on the outer periphery of the tubular mover, and the tubular mover or the stator can perform reciprocating linear motion along its axial direction; a coil assembly is arranged in the stator, and the coil assembly is sleeved on the outer periphery of the tubular mover; the tubular mover comprises a sleeve, and permanent magnets and a yoke are alternately arranged in the sleeve, and the permanent magnets and the yoke are screwed together to adjust the assembly tolerance of the yoke and the permanent magnets.

Description

Technical Field

[0001] The invention belongs to the technical field of tubular linear motors and relates to a cylindrical linear motor with high positioning accuracy. Background Art

[0002] In the field of industrial automation, cylindrical linear motors are widely used. Existing technical solutions mostly use permanent magnets and yokes to bond with glue. Since the tolerances of the yokes and permanent magnets have a range of values, cumulative assembly will lead to large cumulative tolerances. The efficiency of adjusting the tolerances through tolerance adaptation and free combination assembly is extremely low. The longer the length of the magnetic bar, the more difficult it is to control. The permanent magnets and yokes in the conventional cylindrical linear motor magnetic bars are made by gluing and adding sleeves. The magnetic bars made by this structural process are not used as feedback devices, mainly because the accuracy of the pole pitch cannot be guaranteed. Usually, an external position feedback component is used as a feedback device, which is costly. And the longer the length of the magnetic bar, the more serious the deformation of the magnetic bar, which has a certain impact on the assembly of the motor. Summary of the invention

[0003] The purpose of the present invention is to provide a cylindrical linear motor with high positioning accuracy in view of the deficiencies in the prior art, so as to achieve the purpose of adjusting the assembly tolerance of the permanent magnet and the yoke by means of threaded connection.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A cylindrical linear motor with high positioning accuracy comprises a stator and a tubular mover, wherein the stator is sleeved on the outer periphery of the tubular mover, and the tubular mover or the stator can perform reciprocating linear motion along its axis direction;

[0006] A coil assembly is provided in the stator, and the coil assembly is sleeved on the outer periphery of the tubular mover;

[0007] The tubular mover comprises a sleeve, in which permanent magnets and yokes are alternately arranged, and the permanent magnets and the yokes are screwed together to adjust the assembly tolerance of the yokes and the permanent magnets.

[0008] Furthermore, a toothed sleeve is embedded in the permanent magnet, and threaded bosses are provided on both sides of the yoke, and the yoke is threadably connected to the toothed sleeve via the threaded bosses.

[0009] Furthermore, the outer wall of the brace is provided with a limiting convex edge, and the inner wall of the permanent magnet is provided with a limiting groove cooperating with the limiting convex edge, and the limiting convex edge is located in the limiting groove to limit the rotation of the brace.

[0010] Furthermore, the length of the dental brace is smaller than that of the permanent magnet.

[0011] Furthermore, an annular groove is provided at the threaded boss of the yoke.

[0012] Furthermore, end blocks are provided at both ends of the sleeve, and the end blocks are made of non-magnetic conductive material.

[0013] Furthermore, the stator includes a stator shell, a coil assembly arranged inside the stator shell, and support blocks arranged on both sides of the stator shell;

[0014] The end support block is provided with a sliding bearing for positioning and guiding the tubular mover.

[0015] Furthermore, the stator housing is provided with a position feedback element for monitoring the position of the tubular mover.

[0016] Furthermore, the position feedback element is a photoelectric encoder or a magnetic encoder.

[0017] Furthermore, the stator housing is provided with a control panel, and a protective cover is provided outside the control panel.

[0018] By applying the technical solution of the present invention, the assembly tolerance of the permanent magnet and the yoke can be adjusted by screwing together, ensuring that the axial height dimension is within the design requirements. Compared with the traditional glue bonding method, the cumulative tolerance can be greatly reduced and the assembly accuracy can be improved. Integrated position feedback elements, such as photoelectric encoders or magnetic encoders, can improve the positioning accuracy of the motor. No external position feedback components are required, which reduces costs and simplifies the system structure. The force strength of the magnetic rod can be enhanced by assembling and matching the yoke boss thread and the permanent magnet brace, especially when the magnetic rod is longer. At the same time, the cylindricity of the magnetic rod can be improved, further improving the performance of the motor.

[0019] Other features and advantages of the invention will be described in the following description, and partly become apparent from the description, or understood by practicing the invention. The purpose and other advantages of the invention can be realized and obtained by the structures particularly pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is described in detail below in conjunction with the accompanying drawings to make the above advantages of the present invention more clear.

[0021] Figure 1 It is a schematic diagram of a cylindrical linear motor with high positioning accuracy according to the present invention;

[0022] Figure 2 It is a cross-sectional view of a cylindrical linear motor with high positioning accuracy according to the present invention;

[0023] Figure 3 It is a schematic diagram of a permanent magnet of a cylindrical linear motor with high positioning accuracy according to the present invention;

[0024] Figure 4It is an exploded view of a permanent magnet of a cylindrical linear motor with high positioning accuracy according to the present invention;

[0025] Figure 5 It is a schematic diagram of a magnetic yoke of a cylindrical linear motor with high positioning accuracy according to the present invention;

[0026] Figure 6 It is a schematic diagram of assembly tolerance of a cylindrical linear motor with high positioning accuracy according to the present invention. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the present invention, it is necessary to understand that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Reference Figure 1-6As shown, a high positioning accuracy cylindrical linear motor comprises a stator 100 and a tubular mover 200, wherein the stator 100 is sleeved on the outer periphery of the tubular mover 200, and the tubular mover 200 or the stator 100 can perform reciprocating linear motion along its axial direction;

[0032] The stator 100 is provided with a coil assembly 110, and the coil assembly 110 is sleeved on the outer periphery of the tubular mover 200;

[0033] The tubular mover 200 includes a sleeve, in which a permanent magnet 300 and a yoke 400 are alternately arranged, and the permanent magnet 300 and the yoke 400 are screwed together to adjust the assembly tolerance of the yoke 400 and the permanent magnet 300. The magnetic field is generated by the coil assembly 110 of the stator 100, and combined with the assembly of the permanent magnet 300 and the yoke 400, motion control with high positioning accuracy can be achieved. The screw threading method can adjust the assembly tolerance of the yoke 400 and the permanent magnet 300 to ensure that the axial height dimension is within the design requirement range. The traditional glue bonding method has the problem of large cumulative tolerance, while the screw threading method can ensure that the assembly tolerance is within the design requirement range through fine adjustment. In this way, the assembly accuracy can be improved and the assembly error can be reduced. The force strength of the magnetic bar can be enhanced by the screw threading assembly method. Especially when the length of the magnetic bar is long, compared with the traditional glue bonding method, it can more effectively maintain the stability and cylindricity of the magnetic bar.

[0034] In this embodiment, the permanent magnet 300 is embedded with a toothed sleeve 310, and threaded bosses 410 are provided on both sides of the yoke 400, and the yoke 400 is threadedly screwed with the toothed sleeve 310 through the threaded bosses 410. Through the threaded screwing method, the assembly between the yoke 400 and the permanent magnet 300 can be adjusted. The assembly of each set of yokes 400 and permanent magnets 300 can be adjusted within the tolerance range, avoiding the cumulative effect of tolerance. In this way, the accuracy and stability of the assembly can be guaranteed. The threaded boss 410 is screwed into the toothed sleeve 310 to increase the stability of the magnetic rod. Compared with the traditional glue bonding method, the threaded screwing can better fix the magnetic rod and reduce the deformation of the magnetic rod. Especially when the length of the magnetic rod is long, this advantage is more obvious. Assembly adjustment by threaded screwing can improve assembly efficiency. Compared with the traditional tolerance adaptation free combination assembly method, threaded screwing is simpler and faster, which can reduce assembly time and process complexity. Since the threaded connection can better fix the magnetic bar, it can reduce the deformation of the magnetic bar and thus improve the cylindricality of the magnetic bar. This has a great impact on the performance and stability of the motor.

[0035] In this embodiment, the outer wall of the brace 310 is provided with a limiting ridge 320, and the inner wall of the permanent magnet 300 is provided with a limiting groove 330 that cooperates with the limiting ridge 320. The limiting ridge 320 is located in the limiting groove 330 to limit the rotation of the brace 310.

[0036] By setting a limiting ridge 320 and a limiting groove 330 between the brace 310 and the permanent magnet 300, the rotation range of the brace 310 can be limited. In this way, the position of the brace 310 can be fixed, and accidental rotation can be avoided during operation, thereby ensuring the stability and reliability of the system. The cooperation of the limiting ridge 320 and the limiting groove 330 can help accurately locate the position of the brace 310. During the assembly process, the cooperation of the limiting ridge 320 and the limiting groove 330 can ensure the accurate position of the brace 310, avoid assembly errors, and improve assembly accuracy. The limitation of the limiting ridge 320 and the limiting groove 330 can effectively prevent the brace 310 from loosening during operation. In this way, poor assembly, performance degradation or failure caused by looseness can be avoided, and the reliability and stability of the system can be improved. The design of the limiting ridge 320 and the limiting groove 330 can simplify the structure while ensuring the function. Compared with other complex limiting devices, this design is simpler and easier to use, and reduces the number and complexity of parts.

[0037] In this embodiment, the length of the braces 310 is shorter than the length of the permanent magnet 300. By ensuring that the length of the braces 310 is shorter than the length of the permanent magnet 300, it is possible to avoid the surface of the braces 310 being higher than the surface of the permanent magnet 300, thereby avoiding interference during the assembly process. This ensures the smooth progress of the assembly process and reduces assembly errors and assembly difficulties. The problem of interference assembly is avoided, and the assembly efficiency can be improved. The assembly process is smoother, the time for adjustment and debugging is reduced, and the efficiency and production efficiency of assembly are improved. By avoiding interference assembly, the accuracy of assembly can be guaranteed. Without the existence of interference, the assembly process is more stable, the assembly accuracy is higher, and the quality and performance of the product are improved. Interference assembly may cause damage and loss during the assembly process. By designing to ensure that the length of the braces 310 is shorter than the length of the permanent magnet 300, the assembly risk can be reduced and the possibility of damage and loss during the assembly process can be reduced.

[0038] In this embodiment, an annular groove 420 is provided at the threaded boss 410 of the yoke 400. By providing the annular groove 420 at the threaded boss 410, it is possible to prevent the threaded boss 410 from having a fillet higher than the surface of the yoke 400. This can avoid interference during the assembly process of the permanent magnet 300 and the yoke 400, ensuring smooth assembly. The problem of interference assembly is avoided, and the assembly efficiency can be improved. The assembly process is smoother, the time for adjustment and debugging is reduced, and the assembly efficiency and production efficiency are improved. By avoiding interference assembly, the accuracy of assembly can be guaranteed. Without the existence of interference, the assembly process is more stable, the assembly accuracy is higher, and the quality and performance of the product are improved. Interference assembly may cause damage and loss during the assembly process. By designing an annular groove 420 to avoid interference assembly, the assembly risk can be reduced and the possibility of damage and loss during the assembly process can be reduced.

[0039] In this embodiment, end blocks 210 are provided at both ends of the sleeve, and the end blocks 210 are made of non-magnetic material. By arranging the end blocks 210 at both ends of the sleeve, stable support and fixation can be provided to ensure the stability and reliability of the sleeve during operation. The end blocks 210 can withstand axial and radial forces to prevent deformation or loosening of the sleeve. The use of non-magnetic materials to manufacture the end blocks 210 can avoid the interference of the end blocks 210 on the magnetic field of the motor. Magnetic materials may affect the distribution of the magnetic field, while non-magnetic materials can avoid such interference and maintain the performance and stability of the motor. The provision of the end blocks 210 can improve assembly efficiency. During the assembly process, the end blocks 210 can be used as a reference point to facilitate the positioning and fixing of the sleeve, reducing assembly time and process complexity.

[0040] In this embodiment, the stator 100 includes a stator 100 shell, a coil assembly 110 disposed inside the stator 100 shell, and support blocks disposed on both sides of the stator 100 shell;

[0041] The end support block 120 is provided with a sliding bearing for positioning and guiding the tubular mover 200. By setting the support block, a stable support and fixing of the stator 100 housing can be provided. The support block can withstand axial force and radial force to maintain the stability and reliability of the stator 100 housing. A sliding bearing is provided on the end support block 120 for positioning and guiding the tubular mover 200. The sliding bearing can reduce friction and wear and ensure smooth and precise movement of the tubular mover 200. By setting the support block and the sliding bearing, the structure of the stator 100 can be simplified. The support block provides stable support and fixation, and the sliding bearing provides positioning and guiding functions, avoiding the design and manufacture of other complex support structures and guiding devices. The setting of the support block and the sliding bearing can improve assembly efficiency. During the assembly process, the support block and the sliding bearing can be used as reference points to facilitate the positioning and fixing of the stator 100 housing and the tubular mover 200, reducing assembly time and process complexity.

[0042] In this embodiment, the housing of the stator 100 is provided with a position feedback element 500 for monitoring the position of the tubular mover 200 .

[0043] The high-precision assembly and small deformation of the tubular mover 200 are the basis of the built-in position feedback element 500. By controlling the assembly process and the selection of materials, the assembly accuracy and stability of the tubular mover 200 can be guaranteed to meet the requirements of the position feedback element 500. By setting the position feedback element 500 on the stator 100 housing, the position of the tubular mover 200 can be monitored in real time. In this way, accurate position information can be obtained, providing important reference and feedback for the motion control of the motor. The presence of the position feedback element 500 can improve the positioning accuracy of the system. By real-time monitoring the position of the tubular mover 200, the control strategy can be adjusted in time to achieve more accurate position control. The built-in position feedback element 500 can simplify the system structure. Traditional position feedback elements 500 usually need to be external, while this implementation case directly integrates the position feedback element 500 on the stator 100 housing, avoiding the use of external lines and connectors, and simplifying the system structure and wiring.

[0044] In this embodiment, the position feedback element 500 is a photoelectric encoder or a magnetic encoder. Photoelectric encoders and magnetic encoders have high-precision position detection capabilities and can provide accurate position feedback information. They can monitor the position of the tubular mover 200 in real time and convert it into a digital signal or an analog signal to achieve precise position control. Photoelectric encoders and magnetic encoders have the characteristics of fast response and can obtain position information in a short time, thereby achieving fast and accurate control. At the same time, they also have high stability and can maintain accurate position detection capabilities during long-term operation. Photoelectric encoders and magnetic encoders use highly durable materials and structural designs, and can operate stably for a long time in harsh working environments. They have strong anti-interference and anti-vibration performance, and can ensure the accuracy and reliability of position feedback. Photoelectric encoders and magnetic encoders can be selected and configured according to specific needs. They can adapt to different working environments and application scenarios, and can meet the position feedback requirements under different accuracy requirements and working conditions.

[0045] In this implementation case, the stator 100 housing is provided with a control panel 130, and the control panel 130 is provided with a protective cover. The stator 100 housing is provided with a control panel 130, which makes repair and maintenance operations more convenient. A protective cover is provided on the outside of the control panel 130, which can be opened at any time for repair and debugging, reducing the difficulty and time cost of repair. By providing a protective cover, the control panel 130 can be effectively protected from the influence of the external environment, such as dust, moisture, collision, etc. The protective cover can prevent the control panel 130 from being damaged unnecessarily, and improve the reliability and service life of the control panel 130. The existence of the protective cover can improve the safety of the system. It can prevent personnel from misoperating or improperly touching the control panel 130, and prevent the occurrence of safety hazards such as circuit short circuit and electric shock. The protective cover can isolate the control panel 130 from the external environment, making the system layout neater and more beautiful. At the same time, the protective cover can prevent dust and debris from entering the control panel 130 area, keeping the system clean and in good working condition.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cylindrical linear motor with high positioning accuracy, characterized in that: It comprises a stator (100) and a tubular mover (200), wherein the stator (100) is sleeved on the outer periphery of the tubular mover (200), and the tubular mover (200) or the stator (100) can perform reciprocating linear motion along its axial direction; The stator (100) is provided with a coil assembly (110), and the coil assembly (110) is sleeved on the periphery of the tubular mover (200); The tubular mover (200) comprises a sleeve, in which permanent magnets (300) and magnetic yokes (400) are alternately arranged, and the permanent magnets (300) and the magnetic yokes (400) are screwed together to adjust the assembly tolerance of the magnetic yokes (400) and the permanent magnets (300); The permanent magnet (300) is embedded with a toothed sleeve (310), and threaded bosses (410) are provided on both sides of the yoke (400), and the yoke (400) is threadedly connected to the toothed sleeve (310) through the threaded bosses (410); the outer wall of the toothed sleeve (310) is provided with a limiting ridge (320), and the inner wall of the permanent magnet (300) is provided with a limiting groove (330) matched with the limiting ridge (320), and the limiting ridge (320) is located in the limiting groove (330) for limiting the rotation of the toothed sleeve (310).

2. The high positioning accuracy cylindrical linear motor according to claim 1, characterized in that: The length of the dental brace (310) is smaller than that of the permanent magnet (300).

3. The high positioning accuracy cylindrical linear motor according to claim 1, characterized in that: An annular groove (420) is provided at the threaded boss (410) of the yoke (400).

4. The high positioning accuracy cylindrical linear motor according to claim 1, characterized in that: End blocks (210) are provided at both ends of the sleeve, and the end blocks (210) are made of non-magnetic conductive material.

5. The high positioning accuracy cylindrical linear motor according to claim 1, characterized in that: The stator (100) comprises a stator (100) shell, a coil assembly (110) arranged inside the stator (100) shell, and end support blocks (120) arranged on both sides of the stator (100) shell; The end support block (120) is provided with a sliding bearing for positioning and guiding the tubular mover (200).

6. The high positioning accuracy cylindrical linear motor according to claim 1, characterized in that: The stator (100) housing is provided with a position feedback element (500) for monitoring the position of the tubular mover (200).

7. The high positioning accuracy cylindrical linear motor according to claim 6, characterized in that: The position feedback element (500) is a photoelectric encoder or a magnetic encoder.

8. The high positioning accuracy cylindrical linear motor according to claim 1, characterized in that: The stator (100) housing is provided with a control panel (130), and a protective cover is provided outside the control panel (130).

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