CN220798047U - Secondary assembly, linear motor, electromagnetic suspension and vehicle - Google Patents

Abstract

The application relates to a secondary assembly, a linear motor, an electromagnetic suspension and a vehicle. The secondary assembly comprises a sleeve, magnetic steel and a sliding bearing; the inner wall of the magnetic steel is glued with the outer wall of the sliding bearing, and the outer wall of the magnetic steel is connected with the inner wall of the sleeve. The sliding bearing is arranged in the sleeve, so that the space of the secondary assembly along the axial direction can be reduced.

Description

Secondary assembly, linear motor, electromagnetic suspension and vehicle

Technical Field

The present application relates to the field of motor technology, and more particularly, to a secondary assembly, a linear motor, an electromagnetic suspension, and a vehicle.

Background

A linear motor is an electric transmission device that converts electric energy directly into linear motion mechanical energy without any intermediate conversion mechanism.

At present, a tubular linear motor comprises a primary component and a secondary component, wherein the primary component comprises a sleeve and magnetic steel arranged on the inner wall of the sleeve, and the secondary component comprises an iron core and a winding arranged on the iron core; one of the primary component and the secondary component is a stator, the other is a rotor, the rotor moves up and down relative to the stator, and in the action process, the radial direction deviation easily occurs between the rotor and the stator. In order to reduce the radial offset of the mover from the stator, a sliding bearing is usually provided between the stator and the mover.

The sliding bearing is generally in interference fit with the magnetic steel or the iron core, so that the installation is inconvenient.

Therefore, a new technical solution is needed to solve the above technical problems.

Disclosure of Invention

It is an object of the present application to provide a new solution for a sub-assembly.

According to a first aspect of the present application, a secondary assembly is provided. The subassembly includes:

the magnetic steel inner wall is glued with the outer wall of the sliding bearing, and the outer wall of the magnetic steel is connected with the inner wall of the sleeve.

Optionally, the outer wall of the magnetic steel is glued with the inner wall of the sleeve.

Optionally, the magnetic steel comprises a plurality of magnetic rings which are sequentially arranged along the axial direction, and two adjacent magnetic rings are fixedly connected.

Optionally, two adjacent magnetic rings are glued together.

Optionally, the magnetic steel comprises a plurality of magnetic rings which are sequentially arranged along the axial direction, and the sliding bearing at least covers other magnetic rings except the magnetic rings at two ends along the axial direction.

Optionally, the sliding bearing axially covers the magnetic steel.

Optionally, the periphery of magnet steel cladding has the plastic layer, the outer wall of magnet steel passes through the plastic layer with telescopic inner wall is connected.

Optionally, the magnetic ring includes a plurality of segments, and the segments are connected end to end in sequence to form the magnetic ring.

Optionally, the sleeve has a first end along axial one end, slide bearing is close to the one end of first end is the second end, the magnet steel is close to the one end of first end is the third end, the second end protrusion in the third end.

Optionally, the first end protrudes from the second end.

According to a second aspect of the present application, a linear motor is provided. The linear motor comprises the sub-assembly of the above-described embodiments.

Optionally, the linear motor further comprises a primary component, and the primary component is sleeved in the sliding bearing.

Optionally, the primary assembly further comprises a coil and an iron core, the iron core is provided with an annular groove, and the coil is arranged in the annular groove.

Optionally, the sleeve is a cylinder, and the iron core is a cylinder.

According to a third aspect of the present application, a linear motor is provided. The linear motor includes: the magnetic steel mounting column is arranged in the sleeve; the sliding bearing is arranged between the sleeve and the magnetic steel mounting column, and the sliding bearing is bonded with the magnetic steel glue.

Optionally, the inner peripheral surface of the sliding bearing is glued with the outer peripheral surface of the magnetic steel, and the inner peripheral surface of the magnetic steel is fixedly connected with the magnetic steel mounting column.

According to a fourth aspect of the present application, a secondary assembly is provided. The subassembly includes: magnetic steel, a magnetic steel mounting column and a sliding bearing; the inner peripheral surface of the sliding bearing is glued and bonded with the outer peripheral surface of the magnetic steel, and the inner peripheral surface of the magnetic steel is fixedly connected with the magnetic steel mounting column.

According to a fifth aspect of the present application, an electromagnetic suspension is provided. The electromagnetic suspension comprises a linear motor as described above.

According to a sixth aspect of the present application, a vehicle is provided. The vehicle includes an electromagnetic suspension as described above.

In an embodiment of the present application, the secondary assembly comprises a sleeve, magnetic steel and a sliding bearing; the inner wall of the magnetic steel is fixedly connected with the outer wall of the sliding bearing, and the outer wall of the magnetic steel is connected with the inner wall of the sleeve. The sliding bearing is arranged in the sleeve, so that the space of the secondary assembly along the axial direction can be reduced.

Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the present application, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic cross-sectional structure of a linear motor according to an embodiment of the present application.

Fig. 2 is an enlarged schematic view of the portion a in fig. 1.

Fig. 3 is an enlarged schematic view of a portion B in fig. 1.

Fig. 4 is a partial structural schematic diagram of a linear motor according to an embodiment of the present application.

Fig. 5 is a schematic diagram of a magnetic steel structure of a linear motor according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a magnetic steel structure of a linear motor according to another embodiment of the present application.

Reference numerals illustrate:

1. a primary component; 11. an iron core; 12. a coil; 2. a secondary component; 21. a cavity; 211. a first end; 22. a sleeve; 221. a concave portion; 23. magnetic steel; 231. a magnetic ring; 2311. fragments; 232. a third end; 3. an air gap; 4. a sliding bearing; 41. a second end; 8. a glue layer; 9. and a plastic layer.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.

Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

According to some embodiments of the present application, a secondary assembly is provided. As shown in fig. 1 to 4, the sub-assembly 2 includes a sleeve 22, magnetic steel 23, and a slide bearing 4. The inner wall of the magnetic steel 23 is glued with the outer wall of the sliding bearing 4, namely, the magnetic steel 23 is sleeved on the outer wall of the sliding bearing 4. And the outer wall of the magnetic steel 23 is fixedly connected in the sleeve.

In some embodiments of the present application, the secondary assembly 2 comprises a sleeve 22, a magnetic steel 23 and a sliding bearing 4, wherein the magnetic steel 23 is sleeved on the outer wall of the sliding bearing 4, and the outer wall of the magnetic steel 23 facing away from the sliding bearing 4 is connected to the inner wall of the sleeve 22. The slide bearing 4 is provided inside the sleeve 22, so that the space of the sub-assembly 2 in the axial direction can be reduced.

Wherein, sleeve 22 is equipped with cavity 21, and magnet steel 23 and slide bearing 4 are located the inside cavity 21.

The primary assembly 1 of the linear motor is connected to the secondary assembly 2 by means of a sliding bearing 4. That is, the primary assembly 1 is inserted into the cavity 21 of the sleeve 22, and the sliding bearing 4 is sleeved on the primary assembly 1, so that the sliding bearing 4 does not occupy the axial space of the sleeve 22, and the structure of the primary assembly 1 can be simplified.

In some embodiments of the present application, the magnetic steel 23 is in an annular structure, the magnetic steel 23 is sleeved on the sliding bearing 4, and the outer wall of the magnetic steel 23 along the radial direction is connected to the inner wall of the cavity 21. As shown in fig. 4, a glue layer 8 is disposed between the outer wall of the magnetic steel 23 and the inner wall of the cavity 21, and the magnetic steel 23 is fixedly connected to the inner wall of the cavity 21 by bonding. An adhesive layer 8 is also arranged between the magnetic steel 23 and the sliding bearing 4, so that the sliding bearing 4 is fixedly connected with the magnetic steel 23 in an adhesive mode.

Wherein the sleeve 22 may be cylindrical. A cavity 21 is provided in the sleeve 22. The magnetic steel 23 is located in the cavity 21 of the sleeve 22, and the magnetic steel 23 is connected with the inner wall of the sleeve 22.

In some embodiments of the present application, when the secondary assembly 2 is installed, the magnetic steel 23 may be adhered to the outer wall of the sliding bearing 4, then the magnetic steel 23 and the sliding bearing 4 are installed into the sleeve 22 together, and the outer wall of the magnetic steel 23 is fixedly connected to the inner wall of the sleeve 22. Alternatively, the magnetic steel 23 may be first installed in the sleeve 22, and then the sliding bearing 4 may be inserted into the inner ring of the magnetic steel 23. Of course, those skilled in the art may, depending on the actual situation, not specifically limited herein.

According to some embodiments of the present application, as shown in fig. 2, one end of the cavity 21 along the axial direction has a first end 211, one end of the sliding bearing 4 near the first end 211 is a second end 41, one end of the magnetic steel 23 near the first end 211 is a third end 232, and the second end 41 protrudes from the third end 232.

As shown in fig. 2, the cavity 21 has a first end 211 at one end in the axial direction, and the magnetic steel 23 and the slide bearing 4 can be fitted into the cavity 21 from the first end 211. The end of the sliding bearing 4 close to the first end 211 is a second end 41, and the end of the magnetic steel 23 close to the first end 211 is a third end 232. The second end 41 protrudes from the third end 232, that is, the second end 41 Gao Chuyu is disposed at the third end 232. So that the primary assembly 1 can be prevented from striking the magnetic steel 23 when the primary assembly 1 is mounted in the cavity 21, and the magnetic steel 23 is prevented from being damaged. The first end 211 is provided with an opening from which the magnet steel 23 and the sliding bearing 4 can be fitted into the sleeve.

The second end 41 of the sliding bearing 4 may be about 1mm higher than the third end 232. For example, the second end 41 may be 0.7mm, 0.9mm, 1mm, 1.2mm, etc. higher. Those skilled in the art will recognize the actual situation, and are not particularly limited herein.

According to some embodiments of the present application, as shown in fig. 2, the first end 211 protrudes from the second end 41.

As shown in fig. 2, the first end 211 of the cavity 21 may also be disposed to protrude from the second end 41. I.e. the first end 211 is arranged higher than the second end 41. To avoid damage to the end face of the slide bearing 4 by impact.

Wherein the first end 211 of the cavity 21 may be about 1.5mm higher than the second end 41. For example, the second end 41 may be 1.2mm, 1.4mm, 1.5mm, 1.7mm, etc. higher. Those skilled in the art will recognize the actual situation, and are not particularly limited herein.

According to some embodiments of the present application, as shown in fig. 1 to 3, a recess 221 is formed on an inner wall of the cavity 21, and at least a portion of the magnetic steel 23 is disposed in the recess 221 to limit the magnetic steel 23.

As shown in fig. 3, the inner wall of the cavity 21 is provided with a recess 221, and the magnetic steel 23 can be disposed in the recess 221. The sliding grooves can play an axial positioning role on the magnetic steel 23. That is, when the magnetic steel 23 is mounted in the cavity 21, the lower end of the magnetic steel 23 can abut against the side wall of the recess 221 to perform an axial positioning function on the magnetic steel 23.

Alternatively, the magnetic steel 23 may be bonded in the recess 221. The magnetic steel 23 may be fitted in the recess 221 by interference fit with the sleeve 22.

As shown in fig. 3, a part of the magnetic steel 23 in the radial direction is disposed in the recess 221 so that a certain air gap 3 can be provided between the sleeve 22 and the coil 12.

The recess 221 may be an annular groove structure circumferentially arranged on the inner wall of the sleeve 22.

According to some embodiments of the present application, the magnetic steel 23 includes a plurality of magnetic rings 231 disposed along an axial direction, the plurality of magnetic rings 231 are disposed in the cavity 21 along an axial direction of the sleeve 22, and two adjacent magnetic rings 231 are connected.

In some embodiments of the present application, the magnetic steel 23 may include a plurality of magnetic rings 231, where the plurality of magnetic rings 231 are disposed in the cavity 21 along the axial direction of the sleeve 22 and adhered to the inner wall of the cavity 21, and two adjacent magnetic rings 231 are connected.

For example, two adjacent magnetic rings 231 may be connected by glue bonding. Alternatively, the magnetic rings 231 have magnetism, and adjacent two magnetic rings 231 may be connected by magnetism.

In some embodiments of the present application, a plurality of magnetic rings 231 are connected in an axial direction to constitute the magnetic steel 23. The slide bearing 4 covers at least all other magnetic rings 231 except the magnetic rings 231 at both ends in the axial direction. That is, the slide bearing 4 can cover the other magnetic rings 231 of the magnetic steel 23 except for both ends.

Alternatively, in some embodiments, the sliding bearing 4 may cover the entire magnetic steel 23. As shown in fig. 1 to 3, the sliding bearing 4 may cover all the magnetic steels 23, i.e., the axial length of the sliding bearing 4 is the same as the axial length of the magnetic steels 23, or the axial length of the sliding bearing 4 may be larger than the axial length of the magnetic steels 23.

According to some embodiments of the present application, as shown in fig. 4, the outer periphery of the magnetic steel 23 is coated with a plastic layer 9, and the outer wall of the magnetic steel 23 is connected with the inner wall of the sleeve 22 through the plastic layer 9.

As shown in fig. 4, a plurality of magnetic rings 231 are bonded together by glue to form the magnetic steel 23. The outer periphery of the magnetic steel 23 is coated with a plastic layer 9 to further improve the stability of the magnetic steel 23. And so as to bond the inner wall of the magnetic steel 23 with the outer wall of the sliding bearing 4. The outer wall of the magnetic steel 23 is bonded with the inner wall of the sleeve 22 through the plastic layer 9, i.e. the plastic layer 9 is bonded with the inner wall of the sleeve 22.

According to some embodiments of the present application, as shown in fig. 6, the magnetic ring 231 is integrally formed. That is, the magnetic ring 231 may be a complete ring structure.

Alternatively, as shown in fig. 5, the magnetic ring 231 includes a plurality of segments 2311, and the segments 2311 are sequentially connected end to form the magnetic ring 231. Segment 2311 is arcuate, creating attractive forces at the ends of segment 2311. The ends of the plurality of segments 2311 are spliced by magnetic attraction to form the magnetic loop 231. Alternatively, adjacent segments 2311 may be fixedly coupled by adhesive means to form the magnetic loop 231.

Of course, the magnetic steel 23 in the embodiment of the present application is not limited to the above-described structure, and those skilled in the art can set the magnetic steel according to actual needs.

According to another embodiment of the present application, a linear motor is provided. The linear motor comprises the sub-assembly 2 of the above-described embodiment.

In some embodiments of the present application, the secondary assembly 2 comprises a sleeve 22, a magnetic steel 23 and a sliding bearing 4. The magnetic steel 23 is sleeved on the outer wall of the sliding bearing 4, and the outer wall of one end of the magnetic steel 23, which is away from the sliding bearing 4, is fixedly connected with the inner wall of the sleeve 22. The sliding bearing 4 is provided in the sleeve 22, and the space of the sub-assembly 2 in the axial direction can be reduced.

The primary assembly 1 of the linear motor is connected to the secondary assembly 2 by means of a sliding bearing 4. That is, the primary assembly 1 is inserted into the sleeve 22, and the sliding bearing 4 is sleeved on the primary assembly 1, so that the sliding bearing 4 does not occupy the axial space of the sleeve 22, and the structure of the primary assembly 1 can be simplified.

According to some embodiments of the present application, as shown in fig. 1, the linear motor further comprises a primary assembly 1, and the primary assembly 1 is sleeved in a sliding bearing 4.

As shown in fig. 1, the linear motor further comprises a primary assembly 1, and the primary assembly 1 is sleeved in a sliding bearing 4 and can slide relative to the secondary assembly 2. That is, the primary assembly 1 is at least partially inserted into the sleeve 22, and the sliding bearing 4 is sleeved on the outer periphery of the primary assembly 1. The secondary assembly 2 and the primary assembly 1 are allowed to move relative to each other by electromagnetic actuation.

According to some embodiments of the present application, as shown in fig. 1 to 3, the primary assembly 1 includes a core 11, at least a portion of the core 11 is disposed in the sleeve 22, and the sliding bearing 4 is sleeved on the outer periphery of the core 11. The core 11 is slidable with respect to the slide bearing 4.

As shown in fig. 1 to 3, the primary assembly 1 includes a core 11 and a coil 12. The core 11 is provided with an annular groove, and a plurality of annular grooves are provided in the axial direction. The coil 12 is wound in the annular recess. At least part of the iron core 11 is arranged in the sleeve 22, and the sliding bearing 4 is sleeved on the iron core 11, so that an air gap 3 is formed between the coil 12 and the inner wall of the cavity 21 of the sleeve 22. The sliding bearing 4 covers the magnetic steel 23, so that the distance between the coil 12 and the sleeve 22 can be ensured, and the coil 12 is uniformly stressed during working.

The sliding bearing 4 is arranged in the air gap 3, so that the space of the air gap 3 is fully utilized, and the axial space of the secondary assembly 2 is reduced. The sliding bearing 4 also serves as a guide when the primary assembly 1 and the secondary assembly 2 slide relative to each other.

The primary assembly 1 comprises an iron core 11 and a coil 12, the coil 12 is arranged on the iron core 11, the sliding bearing 4 is arranged between the coil 12 and the magnetic steel 23, and the coil 12 and the magnetic steel 23 form electromagnetic driving.

In some embodiments of the present application, the sleeve 22 is a cylinder, and the core 11 is provided in a cylindrical structure. The sleeve 22 is provided with an open end and a closed end at both ends in the axial direction, respectively, from which the core 11 can be fitted into the sleeve 22. The core 11 has a certain clearance from the closed end to ensure that the core 11 slides relative to the sleeve 22.

The iron core 11 and the sleeve 22 are connected through the sliding bearing 4, so that the sleeve 22 does not need to be provided with a guide post connected with the iron core, and the structure of the sleeve can be simplified.

According to another embodiment of the present application, a linear motor is provided. The linear motor comprises a sleeve 22, a magnetic steel mounting column and a sliding bearing 4. Wherein the magnetic steel mounting column is arranged in the sleeve 22; the sliding bearing 4 is arranged between the sleeve 22 and the magnetic steel mounting column, and the sliding bearing 4 is glued with the magnetic steel 23.

In some embodiments of the present application, the magnetic steel mounting posts are disposed within the sleeve 22, the sliding bearing 4 is disposed between the sleeve 22 and the magnetic steel mounting posts, and the sliding bearing 4 is glued to the magnetic steel 23. For example, the inner peripheral surface of the slide bearing 4 is bonded to the outer peripheral surface of the magnetic steel 23. The magnetic steel 23 is sleeved on the magnetic steel mounting column, and the inner peripheral surface of the magnetic steel 23 is fixedly connected with the magnetic steel mounting column, for example, the inner peripheral surface of the magnetic steel 23 is glued with the magnetic steel mounting column.

According to another embodiment of the present application, a sub-assembly 1 is provided. The sub-assembly 1 comprises a magnet steel 23, a magnet steel mounting post and a sliding bearing 4. The inner peripheral surface of the sliding bearing 4 is glued to the outer peripheral surface of the magnetic steel 23, and the inner peripheral surface of the magnetic steel 23 is fixedly connected with the magnetic steel mounting column.

In some embodiments of the present application. The magnetic steel 2 is positioned on the inner peripheral surface of the sliding bearing 4 and is glued and bonded with the outer peripheral surface of the magnetic steel 23. The magnetic steel 23 is sleeved on the magnetic steel mounting column, and the inner peripheral surface of the magnetic steel 23 is fixedly connected with the magnetic steel mounting column, for example, the inner peripheral surface of the magnetic steel 23 can be adhered with the magnetic steel mounting column by glue.

According to another embodiment of the present application, an electromagnetic suspension is provided. The electromagnetic suspension comprises a linear motor as described above.

According to some embodiments of the present application, the linear motor comprises a sub-assembly 2 of the above-described implementation. Wherein the secondary assembly 2 comprises a sleeve 22, magnetic steel 23 and a sliding bearing 4, wherein the sleeve 22 is provided with a cavity 21; the magnetic steel 23 is adhered to the outer wall of the sliding bearing 4, and one end of the magnetic steel 23, which is away from the sliding bearing 4, is connected to the inner wall of the cavity 21. The sliding bearing 4 is arranged in the cavity 21 of the sleeve 22, so that the space of the sub-assembly 2 in the axial direction can be reduced.

The primary assembly 1 of the linear motor is connected to the secondary assembly 2 by means of a sliding bearing 4. That is, the primary assembly 1 is inserted into the cavity 21 of the sleeve 22, and the sliding bearing 4 is sleeved on the primary assembly 1, so that the sliding bearing 4 does not occupy the axial space of the sleeve 22, the structure of the primary assembly 1 can be simplified, and the structure of the linear motor can be simplified.

According to another embodiment of the present application, a vehicle is provided. The vehicle includes an electromagnetic suspension as described above.

According to some embodiments of the present application, the vehicle comprises the electromagnetic suspension of the above embodiments, and the linear motor is adapted for the electromagnetic suspension. The linear motor comprises the secondary assembly 2, wherein the secondary assembly 2 comprises a sleeve 22, magnetic steel 23 and a sliding bearing 4, and the sleeve 22 is provided with a cavity 21; the magnetic steel 23 is sleeved on the outer wall of the sliding bearing 4, and one end of the magnetic steel 23, which is away from the sliding bearing 4, is connected to the inner wall of the cavity 21. The sliding bearing 4 is arranged in the cavity 21 of the sleeve 22, so that the space of the sub-assembly 2 in the axial direction can be reduced. The primary assembly 1 of the linear motor is connected to the secondary assembly 2 by means of a sliding bearing 4. That is, the primary assembly 1 is inserted into the cavity 21 of the sleeve 22, and the sliding bearing 4 is sleeved on the primary assembly 1, so that the sliding bearing 4 does not occupy the axial space of the sleeve 22, the structure of the primary assembly 1 can be simplified, and the structure of the linear motor can be simplified.

The linear motor is suitable for electromagnetic suspensions of vehicles. Of course, the linear motor is not limited to the electromagnetic suspension of the vehicle, and may be set by those skilled in the art according to actual needs.

The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.

Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims (19)

1. A sub-assembly, comprising:

a sleeve (22);

a magnetic steel (23);

the sliding bearing (4), the inner wall of magnet steel (23) with the outer wall glue bonding of sliding bearing (4), just the outer wall connection of magnet steel (23) telescopic inner wall.

2. The subassembly of claim 1, wherein an outer wall of the magnetic steel is glued to an inner wall of the sleeve.

3. The secondary assembly according to claim 1, wherein the magnetic steel (23) comprises a plurality of magnetic rings (231) arranged in sequence along the axial direction, and two adjacent magnetic rings (231) are fixedly connected.

4. A sub-assembly according to claim 3, wherein adjacent two of said magnetic rings are adhesively bonded.

5. The secondary assembly according to claim 1, wherein the magnetic steel comprises a plurality of magnetic rings arranged in sequence in the axial direction, and the sliding bearing (4) covers at least the other magnetic rings except the magnetic rings at both ends in the axial direction.

6. The secondary assembly according to claim 1, wherein the sliding bearing (4) axially covers the magnetic steel.

7. The subassembly of claim 1, wherein the outer periphery of the magnetic steel is coated with a plastic layer, and the outer wall of the magnetic steel is connected with the inner wall of the sleeve through the plastic layer.

8. A sub-assembly according to claim 3, wherein the magnetic ring (231) comprises a plurality of segments (2311), the segments (2311) being connected end to end in sequence to form the magnetic ring (231).

9. The secondary assembly according to claim 1, wherein the sleeve has a first end (211) at one end in the axial direction, the end of the sliding bearing (4) adjacent to the first end is a second end (41), the end of the magnetic steel (23) adjacent to the first end is a third end (232), and the second end (41) protrudes from the third end (232).

10. The sub-assembly according to claim 9, wherein the first end (211) protrudes from the second end (41).

11. A linear motor comprising a sub-assembly as claimed in any one of claims 1 to 10.

12. The linear motor according to claim 11, characterized in that the linear motor further comprises a primary assembly (1), the primary assembly (1) being nested within the sliding bearing.

13. The linear motor of claim 12, wherein the primary assembly further comprises a coil and an iron core, the iron core being provided with an annular groove, the coil being disposed in the annular groove.

14. The linear motor of claim 13, wherein the sleeve is a cylinder and the core is a cylinder.

15. A linear motor, comprising:

a sleeve;

the magnetic steel mounting column is arranged in the sleeve; and

the sliding bearing is arranged between the sleeve and the magnetic steel mounting column, and the sliding bearing is bonded with the magnetic steel glue.

16. The linear motor of claim 15, wherein an inner peripheral surface of the sliding bearing is glued to an outer peripheral surface of the magnetic steel, and wherein the inner peripheral surface of the magnetic steel is fixedly connected to the magnetic steel mounting post.

17. A sub-assembly, comprising:

magnetic steel;

a magnetic steel mounting column; and

the inner peripheral surface of the sliding bearing is glued with the outer peripheral surface of the magnetic steel, and the inner peripheral surface of the magnetic steel is fixedly connected with the magnetic steel mounting column.

18. An electromagnetic suspension comprising a linear motor according to any one of claims 11-16.

19. A vehicle comprising an electromagnetic suspension according to claim 18.