Stator structure of shaft type linear motor and assembling method thereof

Abstract

The invention provides a stator structure of a shaft type linear motor and an assembling method thereof, and belongs to the technical field of motors, the stator structure comprises a shell, the shell is of a cylindrical hollow structure, a plurality of magnet yokes and cylindrical permanent magnets are alternately installed in the shell in the axis direction, and the magnet yokes and the cylindrical permanent magnets are used for providing a magnetic field for sliding of a rotor in the linear motor; axial flow guide grooves are uniformly formed in the contact part of the magnet yoke and the shell and are used for allowing colloid to pass through; the cylindrical permanent magnet is provided with a plurality of fan-shaped sliding ring pieces used for limiting the cylindrical permanent magnet so that the cylindrical permanent magnet and the shell can be kept concentric, and gaps facilitating passing of the colloid are reserved between the sliding ring pieces. Pressing blocks are fixedly installed in the two end sides of the shell, and glue injection holes are formed in the pressing blocks. According to the scheme, the parabola-shaped magnet yoke structure is adopted, the cylindrical permanent magnets with the sliding ring pieces are combined, and the assembly stability and accuracy are effectively improved and the high performance of the stator is ensured through a method of firstly installing and then fixing.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator structure of an axial linear motor and an assembly method thereof. Background Art

[0002] The stator is a fixed component in motors, generators and other rotating mechanical devices, and its corresponding rotating component is the rotor. The key function of the stator is to generate a stable magnetic field, which interacts with the magnetic field generated by the rotor to generate force or torque. In a shaft linear motor, this design can directly convert electrical energy into linear motion. Unlike traditional rotary motor designs, the stator and mover of a shaft linear motor are arranged in a straight line.

[0003] In the prior art, there is a problem with shaft-type linear motors, that is, when the yoke and the permanent magnet are fixed by glue and then installed in the stator housing, there is a tolerance range between the two, which causes installation errors. This error will also increase with the cumulative installation length, and even cause the stator to warp, affecting the performance of the motor. The invention with patent application publication number CN117811302A provides a solution, which introduces a high positioning accuracy cylindrical linear motor. By adopting a threaded connection method, the assembly tolerance between the yoke and the permanent magnet is effectively adjusted, the cumulative error is significantly reduced, and the assembly accuracy is improved. However, this improvement measure still has certain problems. For example, the processing process of the yoke groove thread and the permanent magnet brace is relatively complicated, which increases the production cost; at the same time, the special shape processing of the yoke and the permanent magnet may also cause changes in the magnetic field distribution, which in turn has an adverse effect on the working performance of the motor. Summary of the invention

[0004] The object of the present invention is to provide a stator structure of an axial linear motor and an assembly method thereof to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a stator structure of an axial linear motor, which adopts the following technical solution:

[0006] The linear motor comprises a shell, wherein the shell is a cylindrical hollow structure, and a plurality of magnetic yokes and cylindrical permanent magnets are alternately installed in the shell along the axial direction, and the magnetic yokes and cylindrical permanent magnets are used to provide a magnetic field for the sliding of the mover in the linear motor;

[0007] The contact part between the yoke and the shell is evenly provided with axial guide grooves, and the guide grooves are used for the colloid to pass through;

[0008] The cylindrical permanent magnet is provided with a plurality of sector-shaped slip rings for limiting the position of the cylindrical permanent magnet so that it remains concentric with the housing, and gaps are left between the slip rings for the colloid to pass through;

[0009] A pressing block is fixedly installed inside both end sides of the shell, a glue injection hole is provided on the pressing block, and a plug for sealing the glue injection hole is provided on the outer side of the pressing block.

[0010] As a further improvement, the cylindrical permanent magnets are spaced by yokes, and the same magnetic poles of adjacent magnets are close to each other.

[0011] As a further improvement, the magnetic strengths of the cylindrical permanent magnets are all the same and they are axially magnetized magnets.

[0012] As a further improvement, the magnetic yoke includes magnet one, magnet two and magnet three distributed in sequence, the outer diameter curves of magnet one and magnet three form a parabola, magnet two is a cylinder, and the outer diameter of magnet two is the same as the inner diameter of the shell.

[0013] As a further improvement, the magnetic steel one and the magnetic steel three have the same structure.

[0014] As a further improvement, the diameter of the cylindrical permanent magnet is the same as the minimum end surface diameter of the magnetic steel one or the magnetic steel three.

[0015] As a further improvement, a sealing ring is provided on the inner side of the pressing block.

[0016] As a further improvement, the plug is a fastening bolt.

[0017] The present invention also provides a method for assembling a stator of an axial linear motor, which adopts the stator structure of the axial linear motor and comprises the following steps:

[0018] Installation: Alternately install the yoke and the cylindrical permanent magnet with slip ring inside the housing according to the design requirements, and use sealing rings and pressure blocks to seal both ends of the housing so that the yoke and the cylindrical permanent magnet are in close contact;

[0019] Fix, seal one end of the shell with a plug, and inject colloid into the shell through the injection hole on the pressure block at the other end. When injecting the glue, keep the axis of the shell in a vertical state to prevent the yoke or cylindrical permanent magnet from deflecting under the action of gravity. The injected colloid gradually fills the entire shell space through the gaps and guide grooves between the slip rings, and keeps the yoke and cylindrical permanent magnet coaxial with the shell under the pressure of the colloid;

[0020] Sealing: After the glue injection is completed, use a plug to seal the injected end of the shell. During the process, always keep the shell in a vertical state until the glue is completely solidified.

[0021] As a further improvement, the colloid is epoxy resin.

[0022] The beneficial effects of the above technical solution of the present invention are as follows:

[0023] This solution uses a parabolic yoke structure, combined with a cylindrical permanent magnet with a slip ring, and effectively improves the stability and accuracy of component assembly by installing first and then fixing. By injecting colloid into the shell, the colloid generates uniform pressure on the yoke and cylindrical permanent magnet to ensure that the yoke, cylindrical permanent magnet and shell always remain coaxial until the colloid is completely solidified. This solution further enhances the stability of the overall structure, not only ensuring the high performance of the stator, but also avoiding complex processing and relatively low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 for Figure 1 AA section view;

[0027] Figure 3 for Figure 1 BB cross-sectional view;

[0028] Figure 4 Schematic diagram of the structure of the yoke.

[0029] Description of reference numerals:

[0030] 1. Shell; 2. Yoke; 21. Magnet 1; 22. Magnet 2; 23. Magnet 3; 24. Guide groove; 3. Cylindrical permanent magnet; 4. Slip ring; 5. Colloid; 6. Press block; 7. Sealing ring; 8. Plug. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the 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 position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the prior art, glue is usually used to fix the yoke 2 and the permanent magnet, and then they are assembled into the stator housing 1. This method easily leads to installation errors between the yoke 2 and the permanent magnet. Such errors will continue to accumulate and amplify with the increase of the installation length. In extreme cases, it may even cause deformation of the stator, thereby affecting the operating performance of the motor.

[0034] This solution designs a parabolic yoke 2 structure and combines it with a cylindrical permanent magnet 3 with a slip ring 4. By injecting a colloid 5 into the shell 1, the yoke 2, the cylindrical permanent magnet 3 and the shell 1 are kept in a coaxial state by utilizing the uniform squeezing force of the colloid 5 on the yoke 2 and the stator until the colloid 5 is completely solidified.

[0035] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0036] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0037] Embodiment 1 of the stator structure of an axial linear motor provided by the present invention:

[0038] like Figure 1-4 As shown, a stator structure of an axial linear motor includes a housing 1, a yoke 2 and a cylindrical permanent magnet 3. The housing 1 is a cylindrical hollow structure, and the yoke 2 and the cylindrical permanent magnet 3 are alternately installed in the housing 1 along the axial direction to provide a magnetic field for the sliding of the mover in the linear motor.

[0039] like Figure 1-4As shown, the contact part between the yoke 2 and the shell 1 is evenly provided with axial guide grooves 24. When injecting glue, the colloid 5 fills the shell 1 through the guide grooves 24. The yoke 2 includes magnet steel 1 21, magnet steel 2 22 and magnet steel 3 23 distributed in sequence, wherein the outer diameter curves of magnet steel 1 21 and magnet steel 3 23 form a parabola, magnet steel 2 22 is a cylinder, and the outer diameter of magnet steel 2 22 is the same as the inner diameter of the shell 1. This design idea can make the yoke 2 cooperate with the shell 1 through magnet steel 2 22 to obtain a part of support, and when the colloid 5 completely wraps the yoke 2, it further generates a uniform centripetal extrusion force on it, so that it is consistent with the axis of the shell.

[0040] The diameter of the cylindrical permanent magnet 3 is the same as the diameter of the smallest end face of the magnetic steel 1 21, which is also the diameter of the smallest end face of the magnetic steel 3 23. All the above cylindrical permanent magnets 3 have the same magnetic strength and are axially magnetized magnets. The same magnetic poles of adjacent magnets are close to each other to cooperate with the yoke 2 to provide a stable and optimized magnetic field for the rotor. A number of fan-shaped slip rings 4 are provided on the cylindrical permanent magnet 3, and gaps are left between the slip rings 4. The cylindrical permanent magnet 3 is supported in the shell by the slip rings 4, and the colloid 5 can fill the shell 1 through the gaps between the slip rings 4, and wrap the cylindrical permanent magnet 3 to generate a uniform centripetal extrusion force, so that the cylindrical permanent magnet 3 and the shell axis remain the same, that is, the yoke 2, the cylindrical permanent magnet 3 and the shell are coaxial.

[0041] like Figure 1 As shown, pressure blocks 6 for limiting are fixedly installed at both ends of the shell 1, and injection holes are opened on the pressure block 6 for easy injection of glue. A sealing ring 7 for buffering and sealing is fixedly installed on the inner side of the pressure block 6, and a plug 8 for sealing is also fixedly installed on the outer side of the pressure block 6.

[0042] In this embodiment, the pressure block 6 is fixed at both ends of the shell 1 by welding; the plug 8 used for sealing is a fastening bolt, and accordingly, the injection hole is provided with a thread that cooperates with the fastening bolt. After the injection of glue is completed, the injection hole is sealed by the fastening bolt. This method simplifies the assembly process, improves the assembly efficiency and overall durability.

[0043] The present invention also provides a method for assembling a stator of an axial linear motor, which adopts the stator structure of the axial linear motor and comprises the following steps:

[0044] Installation: The yoke 2 and the cylindrical permanent magnet 3 with the slip ring 4 are alternately installed inside the housing 1 according to the design requirements, and the two ends of the housing 1 are sealed with a sealing ring 7 and a pressing block 6, so that the yoke 2 and the cylindrical permanent magnet 3 are in close contact;

[0045] Fix, use the plug 8 to seal one end of the housing 1, and inject the colloid 5 into the housing 1 through the injection hole on the pressure block 6 at the other end. When injecting the glue, keep the axis of the housing 1 in a vertical state to prevent the yoke 2 or the cylindrical permanent magnet 3 from being deflected under the action of gravity. The injected colloid 5 gradually fills the entire housing 1 space through the gap between the slip rings 4 and the guide groove 24, and makes the yoke 2 and the cylindrical permanent magnet 3 keep coaxial with the housing 1 under the extrusion of the colloid 5;

[0046] Sealing: After the glue injection is completed, use the plug 8 to seal the glue-injected end of the shell 1. During the process, the shell 1 is always kept in a vertical state until the colloid 5 is completely solidified.

[0047] In this embodiment, the colloid 5 used is epoxy resin. Epoxy resin has the characteristics of high-strength bonding, excellent electrical insulation performance, low curing shrinkage, adjustable curing time and easy processing, making it an ideal choice for fixing the yoke 2 and the cylindrical permanent magnet 3, effectively improving the assembly accuracy and operation stability of the motor.

[0048] Embodiment 2 of the stator structure of an axial linear motor provided by the present invention:

[0049] The main difference between it and Example 1 is:

[0050] The two ends of the housing 1 are provided with threads that cooperate with the fastening bolts, while the glue injection hole on the pressure block 6 is not provided with threads. After the glue injection is completed, the fastening bolts are fixedly installed by cooperating with the threads of the housing 1, thereby sealing the glue injection hole. This sealing method is directly fixedly connected to the housing 1, which not only enhances the sealing performance, but also improves the stability of the structure.

[0051] Embodiment 3 of the stator structure of an axial linear motor provided by the present invention:

[0052] The main difference between it and Example 2 is:

[0053] Both sides of the shell 1 and the glue injection hole of the pressing block 6 are provided with threads matching with the fastening bolts. After the glue injection is completed, the fastening bolts are threadedly connected with the shell 1 and the pressing block 6 in turn, thereby sealing the glue injection hole.

[0054] Both ends of the housing 1 and the injection hole of the pressing block 6 are provided with threads matching the fastening bolts. After the injection is completed, the fastening bolts are threadedly connected with the housing 1 and the pressing block 6 in turn to achieve effective sealing of the injection hole. This method further ensures the reliability of the seal and the stability of the structure.

[0055] The above-mentioned ideal embodiments of the present invention are used as inspiration, but it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will think of many changes, modifications and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The attached claims are intended to define the scope of protection of the present invention, and therefore cover the modular composition, equivalent or alternatives within the scope of protection of these claims.

Claims

1. A stator structure of an axis-type linear motor, characterized in that: include: A shell (1), the shell (1) being a cylindrical hollow structure, a plurality of magnetic yokes (2) and cylindrical permanent magnets (3) being alternately installed in the shell (1) along the axial direction, the magnetic yokes (2) and cylindrical permanent magnets (3) being used to provide a magnetic field for the sliding of a mover in the linear motor; Axial guide grooves (24) are evenly arranged at the contact portion between the yoke (2) and the housing (1), and the guide grooves (24) are used for the colloid (5) to pass through; The cylindrical permanent magnet (3) is provided with a plurality of fan-shaped slip rings (4) for limiting the position of the cylindrical permanent magnet (3) so as to keep it concentric with the housing (1); gaps are left between the slip rings (4) to facilitate the passage of the colloid (5); A pressing block (6) is fixedly installed on both end sides of the housing (1), a glue injection hole is provided on the pressing block (6), and a plug (8) for sealing the glue injection hole is provided on the outer side of the pressing block (6).

2. The stator structure of an axial linear motor according to claim 1, characterized in that: The cylindrical permanent magnets (3) are spaced apart by a magnetic yoke (2), and the same magnetic poles of adjacent magnets are close to each other.

3. The stator structure of an axial linear motor according to claim 2, characterized in that: The cylindrical permanent magnets (3) all have the same magnetic strength and are axially magnetized magnets.

4. The stator structure of an axial linear motor according to claim 1, characterized in that: The magnetic yoke (2) comprises a magnetic steel one (21), a magnetic steel two (22) and a magnetic steel three (23) which are distributed in sequence, the outer diameter curves of the magnetic steel one (21) and the magnetic steel three (23) form a parabola, the magnetic steel two (22) is a cylinder, and the outer diameter of the magnetic steel two (22) is the same as the inner diameter of the shell (1).

5. The stator structure of an axial linear motor according to claim 4, characterized in that: The magnetic steel one (21) and the magnetic steel three (23) have the same structure.

6. The stator structure of an axial linear motor according to claim 1 or 5, characterized in that: The diameter of the cylindrical permanent magnet (3) is the same as the minimum end face diameter of the magnetic steel one (21) or the magnetic steel three (23).

7. The stator structure of an axial linear motor according to claim 1, characterized in that: A sealing ring (7) is provided on the inner side of the pressing block (6).

8. The stator structure of an axial linear motor according to claim 1, characterized in that: The plug (8) is a fastening bolt.

9. A method for assembling a stator of an axial linear motor, using the stator structure of the axial linear motor according to any one of claims 1 to 8, characterized in that: The following steps are involved: Installation, the yoke (2) and the cylindrical permanent magnet (3) with the slip ring (4) are alternately installed inside the housing (1) according to design requirements, and the two ends of the housing (1) are sealed using a sealing ring (7) and a pressing block (6) so that the yoke (2) and the cylindrical permanent magnet (3) are in a close contact state; The casing (1) is fixed, one end of which is sealed with a plug (8), and a colloid (5) is injected into the casing (1) through a colloid injection hole on a pressure block (6) at the other end. When injecting the colloid, the axis of the casing (1) is kept in a vertical state to prevent the yoke (2) or the cylindrical permanent magnet (3) from being deflected under the action of gravity. The injected colloid (5) gradually fills the entire casing (1) space through the gap between the slip rings (4) and the guide groove (24), and the yoke (2) and the cylindrical permanent magnet (3) are kept coaxial with the casing (1) under the pressure of the colloid (5); After the glue injection is completed, a plug (8) is used to seal the glue-injected end of the shell (1). During the process, the shell (1) is always kept in a vertical state until the glue (5) is completely solidified.

10. The stator assembly method of a shaft-type linear motor according to claim 9, characterized in that: The colloid (5) is epoxy resin.

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