Linear motor, electromagnetic suspension and vehicle

Abstract

The invention 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 one of the magnetic steel and the winding is arranged on the iron core; when the magnetic steel is arranged on the inner wall of the sleeve, the bearing is located 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 located in an annular gap between the magnetic steel and the inner wall of the sleeve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, and more particularly, to a linear motor, an electromagnetic suspension and a vehicle. BACKGROUND

[0002] A linear motor is a kind of electric power transmission device which directly converts electric energy into linear motion mechanical energy without any intermediate conversion mechanism.

[0003] At present, a tubular linear motor is completely cylindrical, and the mover moves up and down along the stator, so that a radial deviation is prone to occur between the mover and the stator during the movement. In order to reduce the radial deviation between the mover and the stator, bearings are usually arranged between the stator and the mover.

[0004] The bearings are generally shorter than the axial length of the linear motor, so that two or more bearings are usually arranged at the two end portions of the mover or the stator, which increases the axial length of the linear motor.

[0005] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. SUMMARY

[0006] An object of the present application is to provide a new technical solution of a linear motor.

[0007] According to a first aspect of the present application, an electromagnetic suspension applied to a vehicle is provided, which comprises a linear motor, the linear motor comprising a winding and a magnetic steel, the magnetic steel being capable of sliding relative to the winding in the axial direction of the winding; a sleeve, the sleeve being provided with a cavity; one of the winding and the magnetic steel being arranged on the sleeve, and the other being arranged in the cavity; and a bearing, the bearing being located in an annular gap between the winding and the magnetic steel.

[0008] Optionally, the bearing is fixedly connected with one of the winding and the magnetic steel, and forms a sliding support with the other.

[0009] Optionally, the bearing has a lubricating layer on the peripheral surface.

[0010] Optionally, the magnetic steel is formed by laminating a plurality of annular magnetic steel sheets, and an attractive force is formed between adjacent annular magnetic steel sheets.

[0011] Optionally, the annular magnetic steel sheets are integrally formed by injection molding.

[0012] Optionally, adjacent annular magnetic steel sheets are attracted to each other.

[0013] Optionally, the magnetic steel comprises a plurality of magnetic steel sheets, two ends of the magnetic steel sheets form a repulsive force, and adjacent end portions of the magnetic steel sheets are spliced to form annular magnetic steel sheets.

[0014] Optionally, the bearing covers at least part of the magnetic steel.

[0015] Optionally, further comprising a core, the core being arranged in the cavity of the sleeve; when the winding is arranged on the core and the magnetic steel is arranged on the sleeve, the winding and the core jointly form a primary assembly, and the magnetic steel and the sleeve jointly form a secondary assembly; when the winding is arranged on the sleeve and the magnetic steel is arranged on the core, the winding and the sleeve jointly form a primary assembly, and the magnetic steel and the core jointly form a secondary assembly.

[0016] According to a second aspect of the present application, a linear motor is provided. The linear motor comprises a sleeve, a core, a magnetic steel, a winding and a bearing; the 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 core; when the magnetic steel is arranged on the inner wall of the sleeve, the bearing is located in an annular gap between the magnetic steel and the core; when the magnetic steel is arranged on the core, the bearing is located in an annular gap between the magnetic steel and the inner wall of the sleeve.

[0017] Optionally, the bearing is fixedly connected with one of the sleeve and the core, and forms a sliding support with the other.

[0018] Optionally, in the axial direction, the bearing covers the magnetic steel.

[0019] Optionally, the magnetic steel is arranged on the inner wall of the sleeve, and the bearing is fixedly connected with the magnetic steel.

[0020] Optionally, the core comprises a core body, the winding is arranged on the core body, and the bearing is located between the winding and the magnetic steel.

[0021] Optionally, the bearing is bonded to the inner wall of the magnetic steel.

[0022] Optionally, the magnetic steel is in interference fit with the sleeve.

[0023] Optionally, two adjacent magnetic steels are bonded, the bearing is bonded to the inner wall of the magnetic steel, and the bearing covers at least part of the magnetic steel.

[0024] Optionally, the magnetic steel comprises a plurality of magnetic steel pieces, the two ends of the magnetic steel pieces form repulsive forces, and adjacent magnetic steel pieces surround the sleeve to form annular magnetic steel pieces.

[0025] Optionally, adjacent annular magnetic steel pieces form attractive forces.

[0026] Optionally, the magnet has an annular protrusion protruding toward one side of the mandrel body, and the bearing is disposed on the annular protrusion.

[0027] Optionally, the two ends of the sleeve protrude axially from the two ends of the bearing, and the two ends of the bearing protrude axially from the two ends of the magnet.

[0028] Optionally, the inner wall of the sleeve is provided with an annular groove to define the position of the magnet.

[0029] Optionally, the iron core has a cavity inside, and a partition is provided in the cavity to divide the cavity into an upper cavity and a lower cavity that are not connected.

[0030] Optionally, a cooling channel is provided in the upper chamber, and an inlet and an outlet are provided at the end of the iron core. The inlet and the outlet are both located at the end away from the partition, and the inlet and the outlet are both connected to the cooling channel.

[0031] Optionally, the iron core is provided with one liquid inlet and two liquid outlets, with the liquid inlet located between the two liquid outlets.

[0032] Optionally, the linear motor further includes a sensor reading head, a guide post, and a magnetic grating strip. The sensor reading head is disposed in the lower cavity. The sleeve has a bottom cover. The guide post is disposed at the bottom of the sleeve and is at least partially located in the lower cavity. The magnetic grating strip is disposed on the guide post, and the sensor reading head cooperates with the magnetic grating strip.

[0033] According to a third aspect of this application, an electromagnetic suspension is provided. The electromagnetic suspension includes a linear motor as described above.

[0034] According to a fourth aspect of this application, a vehicle is provided. The vehicle includes the electromagnetic suspension described above.

[0035] In this embodiment, by setting the winding and magnet in the sleeve and cavity respectively, and coordinating the bearing in the annular gap, the structural stability and movement flexibility of the electromagnetic suspension are improved, while also facilitating installation and maintenance.

[0036] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0037] The accompanying drawings, which form part of this specification, illustrate embodiments of this application and, together with the specification, serve to explain the principles of this application.

[0038] Figure 1This is a cross-sectional structural diagram of a linear motor according to an embodiment of this application.

[0039] Figure 2 This is a schematic diagram of the structure of the annular magnet sheet according to an embodiment of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Sleeve; 11. Cavity; 12. Annular groove; 13. Magnet; 131. Annular magnet sheet; 1311. Magnet sheet; 2. Iron core; 21. Mandrel body; 22. Winding; 23. Partition; 24. Upper chamber; 25. Lower chamber; 26. Cooling channel; 27. Liquid inlet; 28. Liquid outlet; 3. Annular gap; 4. Bearing; 5. Sensor readout head; 6. Guide post; 7. Magnetic grid strip; 8. Air gap. Detailed Implementation

[0042] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0043] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0044] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0045] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0047] According to one embodiment of this application, a linear motor is provided. The linear motor includes a sleeve 1, an iron core 2, a magnet 13, a winding 22, and a bearing 4. The iron core 2 is sleeved inside the sleeve 1; one of the magnet 13 and the winding 22 is disposed on the inner wall of the sleeve 1, and the other is disposed on the iron core 2; when the magnet 13 is disposed on the inner wall of the sleeve 1, the bearing 4 is located in the annular gap 3 between the magnet 13 and the iron core 2; when the magnet 13 is disposed on the iron core 2, the bearing 4 is located in the annular gap 3 between the magnet 13 and the inner wall of the sleeve 1. This arrangement does not increase the axial length or the outer diameter of the linear motor.

[0048] like Figure 1 As shown, a cavity 11 is formed inside the sleeve 1, and the iron core 2 is placed inside the cavity 11 of the sleeve 1. One of the magnet 13 and the winding 22 is located on the inner wall of the sleeve 1, and the other is located on the iron core 2, so that the sleeve 1 and the iron core 2 can slide relative to each other. Of course, the sleeve 1 can also slide along the axial direction of the iron core 2.

[0049] Electromagnetic drive enables relative motion between sleeve 1 and iron core 2. When winding 22 is located on iron core 2, winding 22 and iron core 2 together form a primary assembly, and magnet 13 and sleeve 1 together form a secondary assembly. The primary assembly and secondary assembly can move relative to each other when winding 22 is energized.

[0050] Of course, in the embodiments of this application, the relative movement of sleeve 1 and iron core 2 is not limited to the above-described manner, and those skilled in the art can set it according to actual needs. For example, electromagnetic drive can be used to enable relative movement between sleeve 1 and iron core 2.

[0051] The diameter of cavity 11 is larger than the diameter of iron core 2, so that an air gap 8 is formed between iron core 2 and the inner wall of sleeve 1. A bearing 4 is installed in the air gap 8, which acts as a guide to allow iron core 2 to move axially along sleeve 1. Alternatively, the bearing 4 can be used to guide the movement of sleeve 1 axially along iron core 2.

[0052] When bearing 4 is connected to iron core 2, bearing 4 and sleeve 1 form a sliding support.

[0053] An air gap 8 is formed between the sleeve 1 and the iron core 2. The magnet 13 and the winding 22 are both located within the air gap 8. The magnet 13 or the winding 22 can be disposed on the inner wall of the sleeve 1. When the magnet 13 is disposed on the inner wall of the sleeve 1, the winding 22 is disposed on the iron core 2. When the winding 22 is disposed on the inner wall of the sleeve 1, the magnet 13 is disposed on the iron core 2.

[0054] When magnet 13 is placed in sleeve 1, an annular gap 3 is formed between magnet 13 and iron core 2, and bearing 4 is placed between magnet 13 and iron core 2. Bearing 4 is a long bearing. By covering magnet 13 with bearing 4, the coaxiality is relatively high, and the airflow between the primary and secondary components is relatively uniform when the primary and secondary components move relative to each other. Thus, no guide rod is needed between the primary and secondary components to ensure airflow, which is a precise linear motor structure.

[0055] In this embodiment, the coaxiality is effectively improved by covering the magnet 13 with the bearing 4, and the air gap 8 between the sleeve 1 and the iron core 2 is relatively uniform when the sleeve 1 and the iron core 2 move relative to each other, so that the bearing 4 plays a guiding role when the iron core 2 and the sleeve 1 slide relative to each other, thus refining the structure of the linear motor.

[0056] In one example, the bearing 4 is fixedly connected to one of the sleeve 1 and the iron core 2, and forms a sliding support with the other.

[0057] like Figure 1 As shown, the sleeve 1 is cylindrical. A cavity 11 is provided inside the sleeve 1. The bearing 4 is located inside the cavity 11 of the sleeve 1, and the bearing 4 is located in the annular gap 3 between the sleeve 1 and the iron core 2.

[0058] The radial dimension of bearing 4 is smaller than the radial dimension of annular gap 3. When bearing 3 is connected to the inner wall of sleeve 1, bearing 4 and iron core 2 form a sliding support. The circumferential surface of bearing 4 has a lubricating layer. When sleeve 1 and iron core 2 move relative to each other, bearing 4 moves synchronously with sleeve 1, and bearing 4 and iron core 2 form a sliding support.

[0059] When bearing 4 is connected to iron core 2, bearing 4 and sleeve 1 form a sliding support. The circumferential surface of bearing 4 has a lubricating layer. When sleeve 1 and iron core 2 move relative to each other, bearing 4 and sleeve 1 move synchronously, and bearing 4 and iron core 2 form a sliding support.

[0060] In one example, the bearing 4 covers the magnet 13 in the axial direction.

[0061] like Figure 1 As shown, in this embodiment, the bearing 4 is a long bearing. The bearing 4 covers the magnet 13, which effectively improves the coaxiality between the bearing 4 and the magnet 13. In addition, the bearing 4 can protect the magnet 13 and prevent it from being damaged by impact during the operation of the linear motor.

[0062] In one example, the magnet 13 is disposed on the inner wall of the sleeve 1, and the bearing 4 is fixedly connected to the magnet 13.

[0063] like Figure 1As shown, when the magnet 13 is disposed on the inner wall of the sleeve 1, the bearing 4 is connected to the sleeve 1, and the bearing 4 covers the magnet 13, effectively improving the coaxiality of the bearing 4 and the magnet 13.

[0064] In one example, the core 2 includes a mandrel body 21. The winding 22 is disposed on the mandrel body 21. The bearing 4 is located between the winding 22 and the magnet 13. The winding 22 and the magnet 13 form an electromagnetic drive.

[0065] like Figure 1 As shown, the mandrel body 21 is cylindrical. The diameter of the mandrel body 21 is smaller than the diameter of the inner wall of the sleeve 1. The winding 22 is disposed on the mandrel body 21. The bearing 4 is disposed between the winding 22 and the magnet 13 to ensure the distance between the winding 22 and the magnet 13. The mandrel body 21 is connected to the winding 22, and the sleeve 1 is connected to the magnet 13. The winding 22 and the magnet 13 form an electromagnetic drive, so that the sleeve 1 and the mandrel body 21 move relative to each other through electromagnetic drive.

[0066] Of course, the winding 22 and magnet 13 in this embodiment are not limited to the above structure, and those skilled in the art can configure them according to actual needs. For example, the winding 22 can be disposed on the sleeve 1. The magnet 13 can be disposed on the mandrel body 21. The winding 22 and the magnet 13 form an electromagnetic drive, so that the sleeve 1 and the mandrel body 21 move relative to each other.

[0067] In one example, the bearing 4 is bonded to the inner wall of the magnet 13.

[0068] like Figure 1 As shown, bearing 4 is a long bearing. The outer wall of bearing 4 is connected to the inner wall of magnet 13 by bonding. By bonding bearing 4 to magnet 13, the thickness of bearing 4 and magnet 13 is effectively increased, thereby reducing the air gap 8 between sleeve 1 and spindle body 21.

[0069] The axial dimension of bearing 4 is the same as that of winding 22, so that bearing 4 on sleeve 1 covers winding 22 on spindle body 21, thereby ensuring that winding 22 is subjected to uniform force during operation.

[0070] Of course, the winding 22 and magnet 13 in this embodiment are not limited to the above structure, and those skilled in the art can make configurations according to actual needs. For example, the bearing 4 can also be a short bearing. When the bearing 4 is a short bearing, multiple bearings 4 are provided between the sleeve 1 and the spindle body 21. The multiple bearings 4 are provided on the inner wall of the magnet 13. The multiple bearings 4 are distributed along the axial direction of the sleeve 1. The multiple bearings 4 are all located between the magnet 13 and the winding 22.

[0071] Of course, the winding 22 and the magnet 13 in this embodiment are not limited to the above structure, and those skilled in the art can make the configuration according to actual needs. For example, the bearing 4 can also be disposed on the winding 22, and the bearing 4 is located between the winding 22 and the magnet 13.

[0072] In one example, the magnet 13 is interference-fitted with the sleeve 1.

[0073] like Figure 1 As shown, the magnet 13 and the sleeve 1 can be connected by an interference fit. The interference fit between the magnet 13 and the sleeve 1 reduces the overall radial dimension of the linear motor.

[0074] In one example, two adjacent magnets 13 are glued together, and the bearing 4 is glued to the inner wall of the magnets 13. The bearing 4 covers at least a portion of the magnets 13.

[0075] like Figure 1 As shown, 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 spindle body 21, thereby ensuring that the winding 22 is subjected to uniform force during operation.

[0076] Of course, the winding 22 and magnet 13 in this embodiment are not limited to the above structure, and those skilled in the art can make configurations according to actual needs. For example, the bearing 4 can also be a short bearing. When the bearing 4 is a short bearing, multiple bearings 4 are provided between the sleeve 1 and the spindle body 21. The multiple bearings 4 are provided on the inner wall of the magnet 13. The multiple bearings 4 are distributed along the axial direction of the sleeve 1. The multiple bearings 4 are all located between the magnet 13 and the winding 22.

[0077] Of course, the winding 22 and the magnet 13 in this embodiment are not limited to the above structure, and those skilled in the art can make the configuration according to actual needs. For example, the bearing 4 can also be disposed on the winding 22, and the bearing 4 is located between the winding 22 and the magnet 13.

[0078] In one example, the magnet 13 comprises a plurality of magnet plates 1311. The two ends of the magnet plates 1311 form a repulsive force. Adjacent magnet plates 1311 surround the sleeve 1 to form an annular magnet plate 131.

[0079] like Figure 2 As shown, the magnet sheet 1311 is arc-shaped. The two ends of the magnet sheet 1311 generate a repulsive force. Multiple magnet sheets 1311 are joined at their ends to form a ring-shaped magnet sheet 131. The ring-shaped magnet sheet 131 is then injection molded into a single unit. Multiple injection-molded ring-shaped magnet sheets 131 are then layered and adhered to the inner wall of the sleeve 1 to form a magnet 13.

[0080] Of course, the magnet 13 in this embodiment is not limited to the structure described above, and those skilled in the art can make modifications according to actual needs. For example, the magnet sheet 1311 can also be bonded to the mandrel body 21.

[0081] In one example, an attractive force is formed between adjacent annular magnet sheets 131.

[0082] Adjacent magnets 1311 on the same layer repel each other. However, adjacent annular magnets 131 attract each other.

[0083] In one example, the magnet 13 has an annular protrusion extending toward one side of the mandrel body 21. The bearing 4 is disposed on the annular protrusion.

[0084] like Figure 1 As shown, the magnet 13 has an annular protrusion extending towards one side of the mandrel body 21. That is, the diameter of the magnet 13 decreases from the middle towards both ends. The diameters at both ends of the magnet 13 are the same in the axial direction. Two bearings 4 are mounted on the annular protrusion. The two bearings 4 are located at opposite ends of the magnet 13. The annular protrusion helps to maintain the distance between the winding 22 and the magnet 13, ensuring that the winding 22 experiences uniform force during operation.

[0085] In one example, the two ends of the sleeve 1 protrude axially from the two ends of the bearing 4. The two ends of the bearing 4 protrude axially from the two ends of the magnet 13.

[0086] like Figure 1 As shown, the size of sleeve 1 is larger than that of bearing 4 in the axial direction. The end face of bearing 4 is 1.5mm lower than the end face of sleeve 1 to avoid impact on the end face of bearing 4 when the linear motor is in motion.

[0087] like Figure 1 As shown, the size of bearing 4 is larger than that of magnet 13 in the axial direction. The end face of magnet 13 is 1mm lower than the end face of bearing 4 to prevent the impact component from damaging magnet 13 when the linear motor is in motion.

[0088] In one example, the inner wall of the sleeve 1 is provided with an annular groove 12 to define the position of the magnet 13.

[0089] like Figure 1 As shown, an annular groove 12 is provided on the inner wall of the sleeve 1, and the magnet 13 is bonded to the inner wall of the annular groove 12. The annular groove 12 defines the position of the magnet 13 on the sleeve 1, so as to facilitate axial positioning when the sleeve 1 moves relative to the mandrel body 21.

[0090] Of course, the annular groove 12 in this embodiment 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 magnet 13 is disposed on the mandrel body 21, the annular groove 12 can be formed on the mandrel body 21 to define the position of the magnet 13.

[0091] In one example, the core 2 has a cavity inside. A partition 23 is provided within the cavity. The partition 23 divides the cavity into an upper cavity 24 and a lower cavity 25 that are not connected.

[0092] like Figure 1 As shown, the mandrel body 21 is cylindrical. A chamber is provided inside the mandrel body 21. A partition 23 divides the chamber into an upper chamber 24 and a lower chamber 25. The upper chamber 24 and the lower chamber 25 are sealed and separated by the partition 23. The lower chamber 25 communicates with the cavity 11 of the sleeve 1.

[0093] Setting a cavity inside the spindle body 21 not only helps to achieve lightweight linear motors, but also reduces the use of materials and lowers costs.

[0094] In one example, a cooling channel 26 is provided within the upper chamber 24. An inlet 27 and an outlet 28 are provided at the end of the iron core 2. Both the inlet 27 and the outlet 28 are located at one end of the partition 23. Both the inlet 27 and the outlet 28 are connected to the cooling channel 26.

[0095] like Figure 1 As shown, the upper chamber 24 is used to cool the mandrel body 21. The mandrel body 21 is cylindrical. A cooling channel 26 is formed inside the upper chamber 24 of the mandrel body 21. The mandrel body 21 is located inside the cavity 11 of the sleeve 1. One end of the mandrel body 21 penetrates the sleeve 1. An inlet 27 and an outlet 28 are provided on the end face of the mandrel body 21 penetrating the sleeve 1. Both the inlet 27 and the outlet 28 are connected to the cooling channel 26.

[0096] Liquid is injected into the cooling channel 26 through the liquid inlet 27. The liquid flows along the cooling channel 26 and flows out through the liquid outlet 28. The heat of the mandrel body 21 is dissipated with the liquid, thereby achieving cooling of the mandrel body 21.

[0097] Of course, the cooling method described above is not limited to the methods used in this embodiment. Those skilled in the art can make adjustments according to actual needs. For example, cooling pipes can be installed on the mandrel body 21.

[0098] 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.

[0099] likeFigure 1 As shown, the mandrel body 21 is provided with one liquid inlet 27 and two liquid outlets 28. The liquid inlet 27 is located between the two liquid outlets 28. Liquid is injected into the cooling channel 26 through the middle liquid inlet 27. The liquid flows along the cooling channel 26 and is divided to the two liquid outlets 28, thereby dissipating the heat of the mandrel body 21 with the liquid, thus achieving cooling of the mandrel body 21.

[0100] Of course, the cooling system in this embodiment is not limited to the structure described above, and those skilled in the art can configure it according to actual needs. For example, the mandrel body 21 may be provided with four or six liquid outlets 28. Liquid is injected into the cooling channel 26 through the injection port, and the liquid is distributed to multiple liquid outlets 28 to dissipate the heat from the mandrel body 21.

[0101] In one example, the linear motor further includes a sensor reading head 5, a guide post 6, and a magnetic grating strip 7. 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 and is located below the spindle body 21. The guide post 6 is at least partially located in the lower chamber 25. The magnetic grating strip 7 is disposed on the guide post 6. The sensor reading head 5 cooperates with the magnetic grating strip 7.

[0102] like Figure 1 As shown, the sensor read head 5 is mounted on the spindle body 21. The guide post 6, where the magnetic grating strip 7 is located, is situated on the sleeve 1. The sleeve 1 slides against the spindle body 21. The sensor read head 5 reads the signal at the corresponding position on the magnetic grating strip 7 to obtain the distance data of the movement between the sleeve 1 and the spindle body 21.

[0103] In this embodiment, when the winding 22 is located on the iron core 2, the winding 22 and the iron core 2 together form a primary component, and the magnet 13 and the sleeve 1 together form a secondary component. The primary component and the secondary component can move relative to each other when the winding 22 is energized.

[0104] The sensor read head 5 is disposed within the lower chamber 25 of the spindle body 21. The guide post 6 is disposed at the bottom of the sleeve 1 and located below the spindle body 21. The guide post 6 is at least partially located within the lower chamber 25 so that the magnetic grating strip 7 on the guide post 6 engages with the sensor read head 5, thereby allowing the sensor read head 5 to read the signal at the corresponding position of the magnetic grating strip 7 and obtain the distance data of the movement between the sleeve 1 and the spindle body 21.

[0105] According to another embodiment of this application, an electromagnetic suspension is provided. The electromagnetic suspension includes a linear motor as described above.

[0106] This linear motor is suitable for electromagnetic suspension.

[0107] According to yet another embodiment of this application, a vehicle is provided. The vehicle includes the electromagnetic suspension described above.

[0108] This linear motor is suitable for electromagnetic suspension systems in vehicles. However, it is not limited to electromagnetic suspension systems; those skilled in the art can configure it according to actual needs.

[0109] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0110] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. An electromagnetic suspension system, applied to a vehicle, characterized in that, Includes a linear motor, the linear motor comprising: The winding (22) and the magnet (13) are slidable relative to the winding (22) along the axial direction of the winding (22); Sleeve (1), wherein a cavity (11) is provided inside the sleeve (1); One of the winding (22) and the magnet (13) is disposed on the sleeve (1), and the other is disposed in the cavity (11); The bearing (4) is located in the annular gap (3) between the winding (22) and the magnet (13).

2. The electromagnetic suspension according to claim 1, characterized in that, The bearing (4) is fixedly connected to one of the winding (22) and the magnet (13), and forms a sliding support with the other.

3. The electromagnetic suspension according to claim 2, characterized in that, The bearing (4) has a lubricating layer on its circumferential surface.

4. The electromagnetic suspension according to claim 2, characterized in that, The magnet (13) is formed by stacking multiple annular magnet sheets (131), and an attractive force is formed between adjacent annular magnet sheets (131).

5. The electromagnetic suspension according to claim 4, characterized in that, The annular magnet sheet (131) is injection molded into a whole.

6. The electromagnetic suspension according to claim 4, characterized in that, The adjacent annular magnets (131) attract each other.

7. The electromagnetic suspension according to claim 2, characterized in that, The magnet (13) includes a plurality of magnet sheets (1311), the two ends of the magnet sheets (1311) form a repulsive force, and the ends of adjacent magnet sheets (1311) are spliced ​​together to form an annular magnet sheet (131).

8. The electromagnetic suspension according to claim 2, characterized in that, The bearing (4) covers at least a portion of the magnet (13).

9. The electromagnetic suspension according to claim 1, characterized in that, It also includes an iron core (2), which is disposed in the cavity (11) of the sleeve (1); when the winding (22) is disposed on the iron core (2), the magnet (13) is disposed on the sleeve (1), the winding (22) and the iron core (2) together form a primary component, and the magnet (13) and the sleeve (1) together form a secondary component; When the magnet (13) is placed on the iron core (2), the winding (22) is placed on the sleeve (1). The winding (22) and the sleeve (1) together form a primary component, and the magnet (13) and the iron core (2) together form a secondary component.

10. A vehicle, characterized in that, Including the electromagnetic suspension as described in any one of claims 1-9.

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