CN117674530A - Linear motor, electromagnetic suspension and vehicle - Google Patents

Abstract

The application relates to a linear motor, an electromagnetic suspension and a vehicle. The linear motor comprises a sleeve, an iron core, magnetic steel, a winding and a bearing; the iron core is sleeved in the sleeve, one of the magnetic steel and the winding is arranged on the inner wall of the sleeve, and the other is arranged on the iron core; when the magnetic steel is arranged on the inner wall of the sleeve, the bearing is positioned in an annular gap between the magnetic steel and the iron core; when the magnetic steel is arranged on the iron core, the bearing is positioned in an annular gap between the magnetic steel and the inner wall of the sleeve.

Description

Linear motor, electromagnetic suspension and vehicle

Technical Field

The application relates to the technical field of motors, and more specifically, relates to 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, the tubular linear motor is completely cylindrical, and the rotor moves up and down along the stator, so that the radial direction deviation between the rotor and the stator is easy to occur in the action process. In order to reduce the radial offset of the mover from the stator, bearings are typically provided between the stator and the mover.

Since the bearing is generally shorter than the linear motor in axial length, the bearing is generally provided with two or more bearings provided at both end portions of the mover or the stator, which increases the axial length of the linear motor.

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

Disclosure of Invention

An object of the present application is to provide a new solution for a linear motor.

According to a first aspect of the present application, a linear motor is provided. The linear motor comprises a sleeve, an iron core, magnetic steel, a winding and a bearing; the iron core is sleeved in the sleeve; one of the magnetic steel and the winding is arranged on the inner wall of the sleeve, and the other is arranged on the iron core; when the magnetic steel is arranged on the inner wall of the sleeve, the bearing is positioned in an annular gap between the magnetic steel and the iron core; when the magnetic steel is arranged on the iron core, the bearing is positioned in an annular gap between the magnetic steel and the inner wall of the sleeve.

Optionally, the bearing is fixedly connected with one of the sleeve and the iron core, and forms a sliding support with the other.

Optionally, the bearing covers the magnetic steel in an axial direction.

Optionally, the magnetic steel is arranged on the inner wall of the sleeve, and the bearing is fixedly connected with the magnetic steel.

Optionally, the iron core includes a core shaft body, the winding is disposed on the core shaft body, and the bearing is located between the winding and the magnetic steel.

Optionally, the bearing is adhered to the inner wall of the magnetic steel.

Optionally, the magnetic steel is in interference fit with the sleeve.

Optionally, two adjacent magnetic steels are glued and bonded, the bearing is glued and bonded to the inner wall of the magnetic steel, and the bearing covers at least part of the magnetic steel.

Optionally, the magnetic steel comprises a plurality of magnetic steel sheets, wherein the two ends of the magnetic steel sheets form repulsive force, and adjacent magnetic steel sheets surround the sleeve to form annular magnetic steel sheets.

Optionally, attractive force is formed between adjacent annular magnetic steel sheets.

Optionally, the magnetic steel is provided with an annular protrusion protruding to one side of the mandrel body, and the bearing is arranged on the annular protrusion.

Optionally, two ends of the sleeve protrude from two ends of the bearing along the axial direction, and two ends of the bearing protrude from two ends of the magnetic steel along the axial direction.

Optionally, an inner wall of the sleeve is provided with an annular groove to define the position of the magnetic steel.

Optionally, a chamber is arranged in the iron core, a partition plate is arranged in the chamber, and the partition plate divides the chamber into an upper chamber and a lower chamber which are not communicated.

Optionally, be provided with the cooling runner in the upper chamber, the tip of iron core is provided with inlet and liquid outlet, the inlet with the liquid outlet all is located keeping away from the one end of baffle, the inlet with the liquid outlet all with the cooling runner intercommunication.

Optionally, the iron core is provided with one liquid inlet and two liquid outlets, and the liquid inlet is located between the two liquid outlets.

Optionally, the linear motor further includes a sensor reading head, a guide pillar and a magnetic grating, the sensor reading head is disposed in the lower chamber, the sleeve has a bottom cover, the guide pillar is disposed at the bottom of the sleeve, the guide pillar is at least partially disposed in the lower chamber, the magnetic grating is disposed on the guide pillar, and the sensor reading head is matched with the magnetic grating.

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

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

In this application embodiment, through set up the air gap between sleeve and iron core, effectively reduce the holistic axial height of linear electric motor. The bearing is arranged in the air gap, so that the air gap space is fully utilized, and the bearing plays a guiding role when the iron core and the sleeve slide relatively.

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 a schematic structural view of an annular magnetic steel sheet according to an embodiment of the present application.

Reference numerals illustrate:

1. a sleeve; 11. a cavity; 12. an annular groove; 13. magnetic steel; 131. annular magnetic steel sheet; 1311. a magnetic steel sheet; 2. an iron core; 21. a mandrel body; 22. a winding; 23. a partition plate; 24. an upper chamber; 25. a lower chamber; 26. a cooling flow passage; 27. a liquid inlet; 28. a liquid outlet; 3. an annular gap; 4. a bearing; 5. a sensor readhead; 6. a guide post; 7. magnetic bars; 8. an air gap.

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 one embodiment of the present application, a linear motor is provided. The linear motor comprises a sleeve 1, an iron core 2, magnetic steel 13, a winding 22 and a bearing 4. The iron core 2 is sleeved in the sleeve 1; one of the magnetic steel 13 and the winding 22 is arranged on the inner wall of the sleeve 1, and the other is arranged on the iron core 2; when the magnetic steel 13 is arranged on the inner wall of the sleeve 1, the bearing 4 is positioned in the annular gap 3 between the magnetic steel 13 and the iron core 2; when the magnetic steel 13 is arranged on the iron core 2, the bearing 4 is positioned in the annular gap 3 between the magnetic steel 13 and the inner wall of the sleeve 1. This arrangement does not increase the axial length of the linear motor nor the outer diameter thereof.

As shown in fig. 1, a cavity 11 is formed in the sleeve 1, and the core 2 is disposed in the cavity 11 of the sleeve 1. One of the magnetic steel 13 and the winding 22 is arranged on the inner wall of the sleeve 1, and the other is arranged on the iron core 2; so that the sleeve 1 and the core 2 can slide relatively. Of course, the sleeve 1 can also slide in the axial direction of the core 2.

The sleeve 1 and the core 2 are allowed to move relative to each other by electromagnetic driving. When the winding 22 is arranged on the iron core 2, the magnetic steel 13 and the sleeve 1 form a secondary component together when the winding 22 and the iron core 2 form a primary component together, and the primary component and the secondary component can move relatively when the winding 22 is electrified.

Of course, in the embodiment of the present application, the relative movement of the sleeve 1 and the core 2 is not limited to the above manner, and a person skilled in the art may set the relative movement according to actual needs. For example, the sleeve 1 and the core 2 can be made to move relatively by electromagnetic driving.

The diameter of the cavity 11 is larger than the diameter of the core 2 so that an air gap 8 is formed between the core 2 and the inner wall of the sleeve 1. A bearing 4 is arranged in the air gap 8, a guide being formed by the bearing 4 to move the core 2 in the axial direction of the sleeve 1. Alternatively, by providing the bearing 4 so as to move the sleeve 1 in the axial direction of the core 2, the bearing 4 plays a guiding role.

When the bearing 4 is connected to the core 2, the bearing 4 forms a sliding support with the sleeve 1. When the bearing 4 is connected to the sleeve 1, the bearing 4 forms a sliding support with the core 2.

An air gap 8 is formed between the sleeve 1 and the core 2. The magnet steel 13 and the winding 22 are both located within the air gap 8. The magnet steel 13 or the windings 22 may be arranged on the inner wall of the sleeve 1. When the magnetic steel 13 is provided on the inner wall of the sleeve 1, the winding 22 is provided on the core 2. When the winding 22 is provided on the inner wall of the sleeve 1, the magnetic steel 13 is provided on the core 2.

When the magnetic steel 13 is arranged on the sleeve 1, an annular gap 3 is formed between the magnetic steel 13 and the iron core 2, and the bearing 4 is arranged between the magnetic steel 13 and the iron core 2. The bearing 4 is a long bearing. The magnetic steel 13 is covered by the bearing 4, so that the coaxiality is higher, and when the primary component and the secondary component move mutually, the breath between the primary component and the secondary component is uniform, so that a guide rod is not required to be arranged between the primary component and the secondary component, the breath can be ensured, and the structure of the linear motor is simplified.

In this application embodiment, cover magnet steel 13 through bearing 4, effectively improve the axiality to when sleeve 1 and iron core 2 mutually moved, air gap 8 between sleeve 1 and the iron core 2 was more even, so that bearing 4 played the guide effect when iron core 2 and sleeve 1 relative slip, retrenched linear electric motor's structure.

In one example, the bearing 4 is fixedly connected to one of the sleeve 1 and the core 2, and forms a sliding support with the other.

As shown in fig. 1, the sleeve 1 has a columnar shape. A cavity 11 is provided in the sleeve 1. The bearing 4 is located in the cavity 11 of the sleeve 1 and the bearing 4 is located in the annular gap 3 between the sleeve 1 and the core 2.

The radial dimension of the bearing 4 is smaller than the radial dimension of the annular gap 3. When the bearing 3 is connected to the inner wall of the sleeve 1, the bearing 4 forms a sliding support with the core 2. The bearing 4 has a lubricating layer on its peripheral surface. When the sleeve 1 and the iron core 2 move mutually, the bearing 4 moves synchronously with the sleeve 1, and the bearing 4 and the iron core 2 form sliding support.

When the bearing 4 is connected to the core 2, the bearing 4 forms a sliding support with the sleeve 1. The bearing 4 has a lubricating layer on its peripheral surface. When the sleeve 1 and the iron core 2 move mutually, the bearing 4 moves synchronously with the sleeve 1, and the bearing 4 and the iron core 2 form sliding support.

In one example, the bearing 4 covers the magnetic steel 13 in the axial direction.

In this embodiment, as shown in fig. 1, the bearing 4 is a long bearing. The bearing 4 covers the magnetic steel 13, so that the coaxiality of the bearing 4 and the magnetic steel 13 is effectively improved, the bearing 4 can play a protective role on the magnetic steel 13, and the magnetic steel 13 is prevented from being damaged due to impact on the magnetic steel 13 in the action process of the linear motor.

In one example, the magnetic steel 13 is disposed on the inner wall of the sleeve 1, and the bearing 4 is fixedly connected with the magnetic steel 13.

As shown in fig. 1, when the magnetic steel 13 is disposed on the inner wall of the sleeve 1, the bearing 4 is connected with the sleeve 1, and the bearing 4 covers the magnetic steel 13, so that the coaxiality of the bearing 4 and the magnetic steel 13 is effectively improved.

In one example, the core 2 includes a core shaft body 21. The winding 22 is arranged on the mandrel body 21. The bearing 4 is located between the winding 22 and the magnetic steel 13. The windings 22 form an electromagnetic drive with the magnetic steel 13.

As shown in fig. 1, the mandrel body 21 has a columnar shape. The diameter of the mandrel body 21 is smaller than the diameter of the inner wall of the sleeve 1. The winding 22 is arranged on the mandrel body 21. By disposing the bearing 4 between the winding 22 and the magnetic steel 13, the distance between the winding 22 and the magnetic steel 13 is ensured. The mandrel body 21 is connected with the winding 22, and the sleeve 1 is connected with the magnetic steel 13. Electromagnetic drive is formed with the magnetic steel 13 through the winding 22, so that the sleeve 1 and the mandrel body 21 form relative movement through the electromagnetic drive.

Of course, the winding 22 and the magnetic steel 13 are not limited to the above structure in the embodiment of the present application, and may be set by those skilled in the art according to actual needs. For example, the winding 22 may be provided on the sleeve 1. The magnetic steel 13 may be disposed on the spindle body 21. Electromagnetic drive is formed with the magnetic steel 13 through the winding 22 so as to enable the sleeve 1 and the mandrel body 21 to form relative motion.

In one example, the bearing 4 is bonded to the inner wall of the magnetic steel 13.

As shown in fig. 1, the bearing 4 is a long bearing. The outer wall of the bearing 4 and the inner wall of the magnetic steel 13 are connected in an adhesive mode. The connection is realized by the bonding mode of the bearing 4 and the magnetic steel 13, so that the thickness of the bearing 4 and the magnetic steel 13 is effectively increased, and the air gap 8 between the sleeve 1 and the mandrel body 21 is reduced.

The axial dimension of the bearing 4 is the same as the axial dimension of the winding 22, so that the bearing 4 on the sleeve 1 covers the winding 22 on the mandrel body 21, thereby ensuring that the winding 22 is uniformly stressed when in operation.

Of course, the winding 22 and the magnetic steel 13 are not limited to the above structure in the embodiment of the present application, and may be set by those skilled in the art according to actual needs. For example, the bearing 4 may also be a short bearing. When the bearing 4 is a short bearing, a plurality of bearings 4 are provided between the sleeve 1 and the spindle body 21. A plurality of bearings 4 are provided on the inner wall of the magnetic steel 13. A plurality of bearings 4 are distributed along the axial direction of the sleeve 1. A plurality of bearings 4 are each located between the magnet steel 13 and the winding 22.

Of course, the winding 22 and the magnetic steel 13 are not limited to the above structure in the embodiment of the present application, and may be set by those skilled in the art according to actual needs. For example, the bearing 4 may also be arranged on the winding 22, said bearing 4 being located between the winding 22 and the magnetic steel 13.

In one example, the magnetic steel 13 is in an interference fit with the sleeve 1.

As shown in fig. 1, the magnetic steel 13 and the sleeve 1 can be connected by interference fit. The magnetic steel 13 is in interference fit with the sleeve 1, so that the overall radial size of the linear motor is reduced.

In one example, two adjacent magnetic steels 13 are glued and bonded, and the bearing 4 is glued and bonded to the inner wall of the magnetic steel 13. The bearing 4 covers at least part of the magnetic steel 13.

As shown in fig. 1, the axial dimension of the bearing 4 is the same as the axial dimension of the winding 22, so that the bearing 4 on the sleeve 1 covers the winding 22 on the mandrel body 21, thereby ensuring that the winding 22 is uniformly stressed during operation.

Of course, the winding 22 and the magnetic steel 13 are not limited to the above structure in the embodiment of the present application, and may be set by those skilled in the art according to actual needs. For example, the bearing 4 may also be a short bearing. When the bearing 4 is a short bearing, a plurality of bearings 4 are provided between the sleeve 1 and the spindle body 21. A plurality of bearings 4 are provided on the inner wall of the magnetic steel 13. A plurality of bearings 4 are distributed along the axial direction of the sleeve 1. A plurality of bearings 4 are each located between the magnet steel 13 and the winding 22.

Of course, the winding 22 and the magnetic steel 13 are not limited to the above structure in the embodiment of the present application, and may be set by those skilled in the art according to actual needs. For example, the bearing 4 may also be arranged on the winding 22, said bearing 4 being located between the winding 22 and the magnetic steel 13.

In one example, the magnetic steel 13 includes a plurality of magnetic steel sheets 1311. The two ends of the magnetic steel sheet 1311 form repulsive force. Adjacent the magnetic steel sheet 1311 surrounds the sleeve 1 to form an annular magnetic steel sheet 131.

As shown in fig. 2, the magnetic steel sheet 1311 has an arc shape. The two ends of the magnetic steel sheet 1311 form opposing forces. The ends of the plurality of magnetic steel sheets 1311 are spliced to form the annular magnetic steel sheet 131. The annular magnetic steel sheet 131 is injection molded to form a whole. A plurality of ring-shaped magnetic steel sheets 131 after injection molding are adhered layer by layer to the inner wall of the sleeve 1 to form the magnetic steel 13.

Of course, the magnetic steel 13 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. For example, the magnetic steel sheet 1311 may be bonded to the mandrel body 21.

In one example, attractive force is formed between adjacent annular magnetic steel sheets 131.

The adjacent magnetic steel sheets 1311 of the same layer are repulsive. But the adjacent annular magnetic steel sheets 131 are attracted to each other.

In one example, the magnetic steel 13 has an annular projection protruding toward the mandrel body 21 side. The annular protrusion is provided with the bearing 4.

As shown in fig. 1, the magnetic steel 13 has an annular projection projecting toward the mandrel body 21 side. That is, the diameter dimension of the magnetic steel 13 decreases from the middle toward both ends. The diameters of both ends of the magnetic steel 13 in the axial direction are the same. The annular protrusion is provided with two bearings 4. The two bearings 4 are respectively positioned at two ends of the magnetic steel 13. The annular bulge is beneficial to ensuring the distance between the winding 22 and the magnetic steel 13, and the winding 22 is uniformly stressed during the bag rescue work.

In one example, the two ends of the sleeve 1 protrude from the two ends of the bearing 4 in the axial direction. Both ends of the bearing 4 protrude from both ends of the magnetic steel 13 in the axial direction.

As shown in fig. 1, the sleeve 1 has a dimension in the axial direction that is larger than the dimension of the bearing 4. The end face of the bearing 4 is 1.5mm lower than the end face of the sleeve 1, so that the end face of the bearing 4 is prevented from being impacted when the linear motor acts.

As shown in fig. 1, the size of the bearing 4 is larger than the size of the magnetic steel 13 in the axial direction. The end face of the magnetic steel 13 is 1mm lower than the end face of the bearing 4, so that the magnetic steel 13 is prevented from being impacted by the striking assembly when the linear motor acts, and the magnetic steel 13 is damaged.

In one example, the inner wall of the sleeve 1 is provided with an annular groove 12 to define the position of the magnet steel 13.

As shown in fig. 1, an annular groove 12 is provided on the inner wall of the sleeve 1, and a magnetic steel 13 is bonded to the inner wall of the annular groove 12. The position of the magnet steel 13 on the sleeve 1 is defined by the annular groove 12 to facilitate axial positioning of the sleeve 1 in relative movement with the spindle body 21.

Of course, the annular groove 12 in the embodiment of the present application is not limited to the above-described position, and those skilled in the art can set it according to actual needs. For example, when the magnetic steel 13 is disposed on the mandrel body 21, an annular groove 12 may be formed on the mandrel body 21 to define the position of the magnetic steel 13.

In one example, the core 2 is internally provided with a cavity. A partition 23 is provided in the chamber. The partition 23 divides the chamber into an upper chamber 24 and a lower chamber 25 which are not in communication.

As shown in fig. 1, the mandrel body 21 has a columnar shape. The mandrel body 21 is internally provided with a chamber. The chamber is divided by a partition 23 into an upper chamber 24 and a lower chamber 25. The upper chamber 24 is hermetically separated from the lower chamber 25 by a partition 23. The lower chamber 25 communicates with the cavity 11 of the sleeve 1.

The cavity is arranged in the mandrel body 21, so that the linear motor is light, the use of materials can be reduced, and the cost is reduced.

In one example, a cooling flow passage 26 is provided in the upper chamber 24. The end of the iron core 2 is provided with a liquid inlet 27 and a liquid outlet 28. The liquid inlet 27 and the liquid outlet 28 are both positioned at one end of the partition 23. The liquid inlet 27 and the liquid outlet 28 are both communicated with the cooling flow passage 26.

As shown in fig. 1, the upper chamber 24 is used for cooling the mandrel body 21. The mandrel body 21 has a columnar shape. A cooling flow passage 26 is formed in the upper chamber 24 of the mandrel body 21. The mandrel body 21 is located within the cavity 11 of the sleeve 1. One end of the mandrel body 21 penetrates the sleeve 1. The end surface of the mandrel body 21 penetrating through the sleeve 1 is provided with a liquid inlet 27 and a liquid outlet 28. Both the liquid inlet 27 and the liquid outlet 28 are communicated with the cooling flow passage 26.

Liquid is injected into the cooling flow passage 26 through the liquid inlet 27, flows along the cooling flow passage 26, and flows out through the liquid outlet 28. The heat of the mandrel body 21 is led out along with the liquid, so that the mandrel body 21 is cooled.

Of course, the cooling in the embodiment of the present application is not limited to the above manner, and those skilled in the art may set the cooling according to actual needs. For example, a cooling pipe is disposed on the mandrel body 21.

In one example, the iron core 2 is provided with one liquid inlet 27 and two liquid outlets 28. The liquid inlet 27 is located between the two liquid outlets 28.

As shown in fig. 1, the mandrel body 21 is provided with a liquid inlet 27 and two liquid outlets 28. The liquid inlet 27 is located between two liquid outlets 28. Liquid is injected into the cooling flow passage 26 through the liquid inlet 27 located in the middle. The liquid flows along the cooling flow channel 26 and is split to the two liquid outlets 28, so that heat of the mandrel body 21 is led out along with the liquid, and cooling of the mandrel body 21 is achieved.

Of course, the cooling in the embodiment of the present application is not limited to the above structure, and those skilled in the art may set the cooling according to actual needs. For example, four liquid outlets 28 or six liquid outlets 28 are provided on the mandrel body 21. Liquid is injected into the cooling flow channel 26 through the liquid injection port, and the liquid is split to the liquid outlets 28 so as to lead out the heat of the mandrel body 21.

In one example, the linear motor further includes a sensor reading head 5, a guide pillar 6 and a magnetic grating 7, where the sensor reading head 5 is disposed in the lower chamber 25, the sleeve 1 has a bottom cover, the guide pillar 6 is disposed at the bottom of the sleeve 1, the guide pillar 6 is located below the mandrel body 21, the guide pillar 6 is at least partially located in the lower chamber 25, the magnetic grating 7 is disposed on the guide pillar 6, and the sensor reading head 5 is matched with the magnetic grating 7.

As shown in fig. 1, the sensor reading head 5 is provided on the spindle body 21. The guide post 6 where the magnetic bars 7 are positioned is positioned on the sleeve 1. The sleeve 1 slides with the spindle body 21. The sensor reading head 5 reads signals at the corresponding positions on the magnetic bars 7 so as to acquire the distance data of the actions of the sleeve 1 and the mandrel body 21.

In the embodiment of the present application, when the winding 22 is disposed on the core 2, the winding 22 and the core 2 form a primary assembly together, and the magnetic steel 13 and the sleeve 1 form a secondary assembly together, and the primary assembly and the secondary assembly can move relatively when the winding 22 is energized.

The sensor reading head 5 is disposed within the lower chamber 25 of the spindle body 21. The guide post 6 is arranged at the bottom of the sleeve 1 and below the mandrel body 21. The guide post 6 is at least partially positioned in the lower cavity 25, so that the magnetic grating 7 on the guide post 6 is matched with the sensor reading head 5, signals of the corresponding positions of the magnetic grating 7 are read through the sensor reading head 5, and distance data of the actions of the sleeve 1 and the mandrel body 21 are obtained.

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

The linear motor is suitable for electromagnetic suspensions.

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

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 linear motor, comprising:

a sleeve (1);

the iron core (2) is sleeved in the sleeve (1);

a magnetic steel (13) and a winding (22), wherein one of the magnetic steel (13) and the winding (22) is arranged on the inner wall of the sleeve (1), and the other is arranged on the iron core (2); and

a bearing (4), wherein when the magnetic steel (13) is arranged on the inner wall of the sleeve (1), the bearing (4) is positioned in an annular gap (3) between the magnetic steel (13) and the iron core (2); when the magnetic steel (13) is arranged on the iron core (2), the bearing (4) is positioned in the annular gap (3) between the magnetic steel (13) and the inner wall of the sleeve (1).

2. Linear motor according to claim 1, characterized in that the bearing (4) is fixedly connected to one of the sleeve (1) and the core (2), forming a sliding support with the other.

3. Linear motor according to claim 1, characterized in that the bearing (4) covers the magnetic steel (13) in the axial direction.

4. The linear motor according to claim 2, characterized in that the magnetic steel (13) is arranged on the inner wall of the sleeve (1), and the bearing (4) is fixedly connected with the magnetic steel (13).

5. Linear motor according to claim 4, characterized in that the core (2) comprises a core shaft body (21), the winding (22) being arranged on the core shaft body (21), the bearing (4) being located between the winding (22) and the magnetic steel (13).

6. A linear motor according to claim 5, characterized in that the bearing (4) is glued to the inner wall of the magnetic steel (13).

7. Linear motor according to claim 5, characterized in that the magnetic steel (13) is in interference fit with the sleeve (1).

8. Linear motor according to claim 5, characterized in that between two adjacent magnetic steels (13) there is glued a joint, the bearing (4) being glued to the inner wall of the magnetic steel (13), the bearing (4) covering at least part of the magnetic steel (13).

9. The linear motor according to claim 5, characterized in that the magnetic steel (13) comprises a plurality of magnetic steel sheets (1311), the two ends of the magnetic steel sheets (1311) form repulsive forces, adjacent magnetic steel sheets (1311) surround the sleeve (1) to form annular magnetic steel sheets (131).

10. The linear motor according to claim 9, characterized in that attractive forces are formed between adjacent annular magnetic steel sheets (131).

11. Linear motor according to claim 5, characterized in that the magnetic steel (13) has an annular projection protruding towards the side of the spindle body (21), on which the bearing (4) is arranged.

12. Linear motor according to claim 5, characterized in that the two ends of the sleeve (1) protrude in the axial direction from the two ends of the bearing (4), the two ends of the bearing (4) protruding in the axial direction from the two ends of the magnetic steel (13).

13. Linear motor according to claim 5, characterized in that the inner wall of the sleeve (1) is provided with an annular groove (12) to define the position of the magnetic steel (13).

14. The linear motor according to claim 5, characterized in that a chamber is provided inside the core (2), a partition (23) is provided inside the chamber, and the partition (23) divides the chamber into an upper chamber (24) and a lower chamber (25) which are not communicated.

15. The linear motor according to claim 14, wherein a cooling flow channel (26) is arranged in the upper chamber (24), a liquid inlet (27) and a liquid outlet (28) are arranged at the end part of the iron core (2), the liquid inlet (27) and the liquid outlet (28) are both positioned at one end far away from the partition plate (23), and the liquid inlet (27) and the liquid outlet (28) are both communicated with the cooling flow channel (26).

16. Linear motor according to claim 15, characterized in that the core (2) is provided with one liquid inlet (27) and two liquid outlets (28), the liquid inlet (27) being located between the two liquid outlets (28).

17. The linear motor of claim 16, further comprising a sensor reading head (5), a guide post (6) and a magnetic grating (7), wherein the sensor reading head (5) is disposed in the lower chamber (25), the sleeve (1) has a bottom cover, the guide post (6) is disposed at the bottom of the sleeve (1), the guide post (6) is at least partially disposed in the lower chamber (25), the magnetic grating (7) is disposed on the guide post (6), and the sensor reading head (5) is matched with the magnetic grating (7).

18. An electromagnetic suspension comprising a linear motor as claimed in any one of claims 1 to 17.

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