Primary assembly, linear motor, electromagnetic suspension and vehicle

Abstract

The utility model discloses a primary assembly, a linear motor, an electromagnetic suspension and a vehicle. The primary assembly comprises a plurality of stator teeth which are arranged at intervals in the axial direction of the primary assembly, the stator teeth are used for arranging windings, and the stator teeth comprise a first stator tooth and a second stator tooth which are located at the two ends of the primary assembly respectively and a middle stator tooth located between the first stator tooth and the second stator tooth. The thickness of at least one of the first stator teeth and the second stator teeth is not equal to the thickness of the middle stator teeth. According to the primary assembly, the end effect force can be reduced, so that the no-load magnetic resistance of the motor is reduced, and the no-load magnetic resistance of the motor can be reduced while the motor can output large thrust density.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and more specifically, to a primary component, a linear motor, an electromagnetic suspension and a vehicle. Background Art

[0002] In the related technology, the stator core of the linear motor is broken at the end, causing a sudden change in the end magnetic field where the permanent magnet of the mover interacts with the stator core. The magnetic flux will produce a tangential magnetic field component, and then generate a magnetic pull, i.e., the end effect force. The air gap magnetic field of the linear motor is easily distorted at the end.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Utility Model Content

[0004] An object of the present invention is to provide a new technical solution for a primary component.

[0005] According to a first aspect of the utility model, a primary component is provided. It includes:

[0006] A plurality of stator teeth are arranged at intervals along the axial direction of the primary assembly, the stator teeth are used to set windings, and the stator teeth include a first stator tooth and a second stator tooth respectively located at two ends of the primary assembly, and an intermediate stator tooth located between the first stator tooth and the second stator tooth;

[0007] Wherein, a thickness of at least one of the first stator tooth and the second stator tooth is not equal to a thickness of the middle stator tooth.

[0008] Optionally, assuming that the pole pitch of the linear motor is Zp, the thickness of at least one of the first stator tooth and the second stator tooth is greater than the thickness of the middle stator tooth, the value of the thickness of the first stator tooth minus the thickness of the middle stator tooth is L1, and the value of the thickness of the second stator tooth minus the thickness of the middle stator tooth is L2, wherein q*Zp<L1+L2≤Zp / 2+q*Zp, q is 0 or a positive integer.

[0009] Optionally, assuming that the motor pole pitch is Zp, the thickness of at least one of the first stator tooth and the second stator tooth is smaller than the thickness of the middle stator tooth, the value of the thickness of the middle stator tooth minus the thickness of the first stator tooth is L1, and the value of the thickness of the middle stator tooth minus the thickness of the second stator tooth is L2, wherein 0<L1+L2≤Zp / 2.

[0010] Optionally, L1+L2=Zp / 2.

[0011] Optionally, assuming that the length of the primary component is Ls, the pole pitch of the linear motor is Zp, Ls=(k±0.5)*Zp, where k is a positive integer.

[0012] Optionally, k is an odd number.

[0013] Optionally, a stator slot is formed between two adjacent stator teeth, and a double-layer winding is arranged in the stator slot.

[0014] According to a second aspect of the present invention, a linear motor is provided, which comprises a secondary assembly and the primary assembly of the above embodiment, wherein the secondary assembly is slidably disposed outside the primary assembly.

[0015] Optionally, the linear motor is a three-slot four-pole linear motor.

[0016] Optionally, the length of the secondary component is greater than the length of the primary component.

[0017] According to a third aspect of the utility model, an electromagnetic suspension is provided, comprising a shock absorbing assembly and the linear motor of the above embodiment, wherein the shock absorbing assembly is connected to the linear motor.

[0018] According to a fourth aspect of the present utility model, a vehicle is provided, which comprises a vehicle body and the electromagnetic suspension of the above embodiment, wherein the electromagnetic suspension is connected to the vehicle body.

[0019] A technical effect of the present application is that a primary assembly is provided with a plurality of stator teeth at intervals along the axial direction, the stator teeth are suitable for providing windings, the stator teeth include a first stator tooth and a second stator tooth respectively located at two ends of the primary assembly, and an intermediate stator tooth located between the first stator tooth and the second stator tooth, and the thickness of at least one of the first stator tooth and the second stator tooth is not equal to the thickness of the intermediate stator tooth. The primary assembly of the present application can reduce the end effect force to reduce the no-load magnetic resistance of the motor.

[0020] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0022] Figure 1 It is a schematic diagram of the partial structure of a linear motor according to an embodiment of the present application.

[0023] Figure 2 It is a schematic diagram of the partial structure of a linear motor according to another embodiment of the present application.

[0024] Figure 3 The motor magnetic resistance distribution diagram of a linear motor according to one embodiment of the present application.

[0025] Figure 4 4 is a graph showing the magnetic resistance of primary components of different lengths according to an embodiment of the present application.

[0026] Reference numerals:

[0027] 1. Primary assembly; 11. Intermediate stator tooth; 12. First stator tooth; 13. Second stator tooth; 14. Coil winding;

[0028] 2. Secondary components;

[0029] 3. Shell. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0033] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0034] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] According to one embodiment of the present application, a primary component 1 is provided. Figure 1 and Figure 2 As shown, the primary component 1 includes: a plurality of stator teeth arranged at intervals along the axial direction of the primary component 1, the stator teeth are used to set windings, and the stator teeth include a first stator tooth 12 and a second stator tooth 13 respectively located at two ends of the primary component 1, and an intermediate stator tooth 11 located between the first stator tooth 12 and the second stator tooth 13. The thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is not equal to the thickness of the intermediate stator tooth 11.

[0036] In this example, the primary component 1 is provided with a plurality of stator teeth spaced apart in the axial direction, and the stator teeth include a first stator tooth 12 and a second stator tooth 13 respectively located at two ends of the primary component 1, and an intermediate stator tooth 11 located between the first stator tooth 12 and the second stator tooth 13. The thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is not equal to the thickness of the intermediate stator tooth 11. For example, the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is less than the thickness of the intermediate stator tooth 11. Alternatively, the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is greater than the thickness of the intermediate stator tooth 11. The primary component 1 of the present application can reduce the end effect force to reduce the no-load magnetic drag of the motor, so that the motor can output a larger thrust density while reducing its no-load magnetic drag.

[0037] like Figure 3 As shown, the primary component 1 is provided with a plurality of stator teeth at intervals along the axial direction, a stator slot is formed between two adjacent stator teeth, and a coil winding 14 is provided in the stator slot. Among them, the stator slot can be a double-layer two-phase winding structure. The motor magnetic resistance mainly includes the slot force F and the end effect forces Fn+ and Fn- at both ends. The slot force F is mainly caused by the inconsistent force of the permanent magnet magnetic field on both sides of the slot due to the slotting of the stator core (the different magnetic permeabilities of air and the core lead to different magnetic resistance of the slot magnetic circuit, which changes the magnetic field energy storage). The end effect forces Fn+ and Fn- at both ends are due to the opening of the stator core, the asymmetry of the three-phase winding of the motor, and the distortion of the air gap magnetic field of the linear motor at the end, which is caused by the magnetic force difference of the permanent magnet magnetic field of the mover of the secondary component 2 at both ends of the primary component 1. The structure of the primary component 1 of the present application can reduce the end effect force, thereby reducing the no-load magnetic resistance of the motor.

[0038] like Figure 2 As shown, Figure 2 The schematic diagram of the structure of a unit cycle of the linear motor is shown in FIG. The primary component is provided with a plurality of stator teeth spaced apart in the axial direction. The stator teeth at both ends of the primary component 1 are the first stator teeth 12 and the second stator teeth 13, and the plurality of intermediate stator teeth 11 are located between the first stator teeth 12 and the second stator teeth 13.

[0039] In this example, if the thickness of the first stator tooth 12 along the axial direction is less than the thickness of the middle stator tooth 11 along the axial direction, the thickness of the second stator tooth 13 can be set to be less than or equal to the thickness of the middle stator tooth 11. If the thickness of the second stator tooth 13 along the axial direction is less than the thickness of the middle stator tooth 11, the thickness of the first stator tooth 12 can be set to be less than or equal to the thickness of the middle stator tooth 11.

[0040] Alternatively, if the thickness of the first stator tooth 12 along the axial direction is greater than the thickness of the middle stator tooth 11 along the axial direction, the thickness of the second stator tooth 13 can be set to be greater than or equal to the thickness of the middle stator tooth 11. If the thickness of the second stator tooth 13 along the axial direction is greater than the thickness of the middle stator tooth 11, the thickness of the first stator tooth 12 can be set to be greater than or equal to the thickness of the middle stator tooth 11.

[0041] In an example, Figure 2 As shown, assuming that the motor pole pitch is Zp, the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is greater than the thickness of the middle stator tooth 11, the value of the thickness of the first stator tooth 12 minus the thickness of the middle stator tooth 11 is L1, and the value of the thickness of the second stator tooth 13 minus the thickness of the middle stator tooth 11 is L2, wherein q*Zp<L1+L2≤Zp / 2+q*Zp, q is 0 or a positive integer.

[0042] In this example, let the linear motor pole pitch be Zp, and the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is greater than the thickness of the middle stator tooth 11. The difference between the thickness of the first stator tooth 12 and the thickness of the middle stator tooth 11 is L1, and the difference between the thickness of the second stator tooth 13 and the thickness of the middle stator tooth 11 is L2. Among them, L1 and L2 satisfy: q*Zp<L1+L2≤Zp / 2+q*Zp, and L1≥0, L2≥0.

[0043] For example, q may be 0, that is, 0<L1+L2≤Zp / 2. At this time, the value of L1+L2 may be Zp / 4, Zp / 3 or Zp / 2, etc., which may be determined by those skilled in the art according to actual conditions and is not specifically limited here.

[0044] Among them, L1 may be equal to L2, for example, when L1+L2=Zp / 2, L1=L2=Zp / 4. That is, the thickness of the first stator tooth 12 and the second stator tooth 13 is Zp / 4 greater than the thickness of the middle stator tooth 11. Alternatively, L1 may not be equal to L2, for example, when L1+L2=Zp / 2, L1=0, L2=Zp / 2. The values ​​of L1 and L2 can be determined by those skilled in the art according to actual conditions, and are not specifically limited here.

[0045] Of course, the value of q may also be 1, 2 or 3, etc. Those skilled in the art may determine the value according to actual conditions, for example, the value may be set according to the axial length of the primary component 1, and no specific limitation is made here.

[0046] In one example, assuming that the motor pole pitch is Zp, the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is less than the thickness of the middle stator tooth 11, the value of the thickness of the middle stator tooth 11 minus the thickness of the first stator tooth 12 is L1, and the value of the thickness of the middle stator tooth 11 minus the thickness of the second stator tooth 13 is L2, wherein 0<L1+L2≤Zp / 2.

[0047] In this example, if Figure 2 As shown, the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is less than the thickness of the middle stator tooth 11. Let the pole pitch of the linear motor be Zp, the thickness of the first stator tooth 12 is L1 less than the thickness of the middle stator tooth 11, and the thickness of the second stator tooth 13 is L2 less than the thickness of the middle stator tooth 11. Among them, L1 and L2 satisfy: 0<L1+L2≤Zp / 2.

[0048] For example, the value of L1+L2 may be Zp / 4, Zp / 3 or Zp / 2, etc. Those skilled in the art may determine the value based on actual conditions, and no specific limitation is made here.

[0049] Among them, L1 may be equal to L2, for example, when L1+L2=Zp / 2, L1=L2=Zp / 4. That is, the thickness of the first stator tooth 12 and the second stator tooth 13 are both less than the thickness of the middle stator tooth 11 by Zp / 4. Alternatively, L1 may not be equal to L2, for example, when L1+L2=Zp / 2, L1=0, L2=Zp / 2. The values ​​of L1 and L2 may be determined by those skilled in the art according to actual conditions, and are not specifically limited here.

[0050] In one example, let the length of the primary component 1 be Ls, the pole pitch of the linear motor be Zp, the unit length of the unit cycle of the linear motor be H, and the number of unit cycles be m. Figure 4 As shown, the horizontal axis represents the running time of the linear motor, and the vertical axis represents the electromagnetic resistance. When the length of the primary component 1 Ls = 4mZp, that is, the thickness of all stator teeth is equal, the simulation result of the magnetic resistance of the linear motor is Figure 4 As shown in curve B.

[0051] When the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is greater than the thickness of the middle stator tooth 11, and L1+L2=Zp / 2, that is, the length of the primary component 1 increases by Zp / 2, Ls=4mZp+Zp / 2, the simulation result of the magnetic resistance of the linear motor is Figure 4 As shown in the C curve.

[0052] When the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is less than the thickness of the middle stator tooth 11, and L1+L2=Zp / 2, that is, the length of the primary component 1 is reduced by Zp / 2, Ls=4mZp-Zp / 2, the reluctance force simulation result of the linear motor is Figure 4 As shown in curve A.

[0053] like Figure 4 It can be seen from the curve shown that when the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is less than the thickness of the middle stator tooth 11, the magnetic resistance of the linear motor is greatly reduced. Alternatively, when the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is greater than the thickness of the middle stator tooth 11, the magnetic resistance of the linear motor is also greatly reduced. Moreover, the magnetic resistance when the length of the primary component 1 increases by Zp / 2 is slightly lower than the magnetic resistance when the length of the primary component 1 decreases by Zp / 2. Increasing the length of the primary component 1 can reduce magnetic field saturation, increase load thrust output, and increase the thrust density of the linear motor.

[0054] After the primary stator core is disconnected, the stator ends interact with the permanent magnets to generate end effect forces, and the magnitude of the end effect forces is related to the relative displacement between the two ends of the stator core and the permanent magnets. The end effect forces on the stator core can be decomposed into the sum of two end force components formed by the interaction between the two ends of the stator and the permanent magnets of the mover, and the two end force components are periodic functions of the permanent magnet pole pitch zp.

[0055] In an example, let the end force on the linear motor be Fend:

[0056]

[0057] Where Fn is the Fourier decomposition coefficient of the force on one end of the cylindrical permanent magnet linear motor, Zp is the pole pitch of the linear motor, σ represents the phase difference between the forces at the upper and lower ends of the primary of the linear motor, and x is the relative position of the end of the stator core relative to a certain reference position.

[0058] According to the end effect force formula, it can be known that when When it is zero, the end force is minimum, that is, the corresponding σ is: σ=(2k+1)π.

[0059] Since the end force Fend of the linear motor is a periodic function with the pole pitch as the period, the phase difference σ between the left and right end forces corresponds to the length Ls of the primary component 1. When the length of the primary component 1 satisfies Ls=zp*σ / 2π=(k±0.5)*Zp, the end effect force of the linear motor reaches the minimum value.

[0060] Wherein, k is a positive integer, for example, it can be 1, 2, 3 or 4, etc., and those skilled in the art may determine it according to the actual situation, and no specific limitation is made here.

[0061] In this example, when k is an odd number, the end force harmonic content is low and the end effect force is lower. For example, k can be 1, 3 or 5, etc.

[0062] In an example, Figure 2 As shown, the thickness of the middle stator tooth 11 is set to St, and the thickness of the first stator tooth 12 is S1, satisfying that S1=St / 4.

[0063] like Figure 2 As shown, let the thickness of the middle stator tooth 11 be St, and the thickness of the first stator tooth 12 be S1. And St and S1 satisfy, S1=St / 4. That is, the thickness of the first stator tooth 12 is less than that of the middle stator tooth 11, and is equal to one quarter of the thickness of the middle stator tooth 11.

[0064] In this example, the thickness of the second stator tooth 13 is also less than the thickness of the middle stator tooth 11. The thickness of the second stator tooth 13 may also be one quarter of the thickness of the middle stator tooth 11. Of course, the specific thickness of the second stator tooth 13 can be determined by those skilled in the art according to actual conditions.

[0065] In one example, a reinforcement piece is provided at an end of the first stator tooth 12 and / or the second stator tooth 13 facing away from the middle stator tooth 11 .

[0066] In this example, when the thickness of the first stator tooth 12 is smaller than the thickness of the middle stator tooth 11 , a reinforcement member may be provided at the end of the first stator tooth 12 away from the middle stator tooth 11 to improve the strength of the first stator tooth 12 .

[0067] Of course, when the thickness of the second stator tooth 13 is less than the thickness of the middle stator tooth 11, a reinforcement member may be provided at the end of the second stator tooth 13 away from the middle stator tooth 11 to improve the strength of the second stator tooth 13. That is, when the thickness of the stator teeth at both ends of the primary assembly 1 is small, reinforcement members may be provided at both ends of the primary assembly 1 to improve the strength of the stator teeth at both ends of the primary assembly 1, thereby improving the strength of the primary assembly 1.

[0068] In this example, the reinforcing member is a non-magnetic material. For example, the reinforcing member may include non-magnetic materials such as aluminum or stainless steel. Of course, the reinforcing member may also be other materials, that is, metals and alloys other than iron, cobalt, nickel and their alloys. Those skilled in the art may determine the material according to actual conditions, and no specific limitation is made here.

[0069] In this example, the reinforcement member can be connected to the primary component 1 by bonding or welding. Of course, other connection methods are also possible, and those skilled in the art can determine according to actual conditions, and no specific limitation is made here.

[0070] In one example, a stator slot is formed between two adjacent stator teeth, and a double-layer winding is arranged in the stator slot. The primary component is provided with a plurality of stator teeth spaced axially, a stator slot is formed between two adjacent stator teeth, and a coil winding is arranged in the stator slot. A double-layer two-phase winding structure can be arranged in the stator slot.

[0071] According to another embodiment of the present invention, a linear motor is provided, which includes a secondary component 2 and the primary component 1 described in the above embodiment. The secondary component 2 is slidably disposed on the outer periphery of the primary component 1.

[0072] In this example, the primary component 1 is provided with a plurality of stator teeth spaced apart in the axial direction, and the stator teeth include a first stator tooth 12 and a second stator tooth 13 respectively located at two ends of the primary component 1, and an intermediate stator tooth 11 located between the first stator tooth 12 and the second stator tooth 13; the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is less than the thickness of the intermediate stator tooth 11, or the thickness of at least one of the first stator tooth 12 and the second stator tooth 13 is greater than the thickness of the intermediate stator tooth 11. The primary component 1 of the present application can reduce the end effect force to reduce the no-load magnetic drag of the motor, so that the linear motor can output a larger thrust density while reducing its no-load magnetic drag.

[0073] In this example, the secondary component 2 can be a plurality of magnetic rings arranged in a Halbach array, that is, the plurality of magnetic rings are arranged in an alternating manner of axial and radial magnetization. The permanent magnets in this array cause the magnetic field on the side of the rotor close to the air gap to be enhanced and the magnetic field on the side away from the air gap to be weakened, thereby increasing the electromagnetic air gap flux, reducing the magnetic flux of the yoke, and improving the thrust density of the motor.

[0074] In one example, the linear motor is a three-slot four-pole linear motor. The linear motor can be a three-slot four-pole motor, and the stator slots of the primary component 1 are arranged as a double-layer two-phase winding structure. The linear motor also includes a secondary component 2 and a housing 3. The secondary component is sleeved on the outer periphery of the primary component 1, and the housing 3 is sleeved on the outer periphery of the secondary component.

[0075] In one example, the length of the secondary component 2 is greater than the length of the primary component 1. The secondary component 2 is slidably sleeved on the outer periphery of the primary component 1, and the axial length of the secondary component 2 is greater than the axial length of the primary component 1.

[0076] Of course, the linear motor also includes at least all the beneficial effects of the above embodiments, which will not be elaborated here.

[0077] According to another embodiment of the utility model, an electromagnetic suspension is provided. The electromagnetic suspension includes a shock absorbing assembly and the linear motor of the above embodiment. The shock absorbing assembly is connected to the linear motor to form an electromagnetic suspension. Of course, regarding the actual application environment of the linear motor of the present application, those skilled in the art can choose according to the actual situation, and no specific limitation is made here.

[0078] According to another embodiment of the utility model, a vehicle is provided. The vehicle comprises a vehicle body and the electromagnetic suspension of the above embodiment. The electromagnetic suspension is connected to the vehicle body to maintain the stability of the vehicle during operation.

[0079] The above embodiments focus on 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. Considering the simplicity of the text, they will not be repeated here.

[0080] Although some specific embodiments of the present invention have been described in detail by way of examples, 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 invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A primary component, characterized in that include: A plurality of stator teeth arranged at intervals along the axial direction of the primary component, the stator teeth being used to set windings, the stator teeth comprising a first stator tooth (12) and a second stator tooth (13) respectively located at two ends of the primary component, and an intermediate stator tooth (11) located between the first stator tooth (12) and the second stator tooth (13); The thickness of at least one of the first stator tooth (12) and the second stator tooth (13) is not equal to the thickness of the middle stator tooth (11).

2. The primary component according to claim 1, characterized in that Assuming that the pole pitch of the linear motor is Zp, the thickness of at least one of the first stator tooth and the second stator tooth is greater than the thickness of the middle stator tooth, the value of the thickness of the first stator tooth (12) minus the thickness of the middle stator tooth (11) is L1, and the value of the thickness of the second stator tooth (13) minus the thickness of the middle stator tooth (11) is L2, wherein q*Zp<L1+L2≤Zp / 2+q*Zp, q is 0 or a positive integer.

3. The primary component according to claim 1, characterized in that Assuming that the motor pole pitch is Zp, the thickness of at least one of the first stator tooth and the second stator tooth is smaller than the thickness of the middle stator tooth, the value of the thickness of the middle stator tooth (11) minus the thickness of the first stator tooth (12) is L1, and the value of the thickness of the middle stator tooth (11) minus the thickness of the second stator tooth (13) is L2, wherein 0<L1+L2≤Zp / 2.

4. The primary component according to claim 2 or 3, characterized in that L1+L2=Zp / 2.

5. The primary assembly according to claim 1, characterized in that Assume that the length of the primary component is Ls, the pole pitch of the linear motor is Zp, Ls = (k ± 0.5) * Zp, where k is a positive integer.

6. The primary assembly according to claim 5, characterized in that k is an odd number.

7. The primary assembly according to claim 1, characterized in that A stator slot is formed between two adjacent stator teeth, and a double-layer winding is arranged in the stator slot.

8. A linear motor, characterized in that: It comprises a primary component (1) and a secondary component (2) as claimed in any one of claims 1 to 7, wherein the secondary component (2) is slidably arranged outside the primary component (1).

9. The linear motor according to claim 8, characterized in that: The linear motor is a three-slot four-pole linear motor.

10. The linear motor according to claim 8, characterized in that: The length of the secondary assembly (2) is greater than the length of the primary assembly (1).

11. An electromagnetic suspension, characterized in that: It comprises a shock absorbing assembly and a linear motor as claimed in any one of claims 8 to 10, wherein the shock absorbing assembly is connected to the linear motor.

12. A vehicle, characterized in that: It comprises a vehicle body, and the electromagnetic suspension as claimed in claim 11, wherein the electromagnetic suspension is connected to the vehicle body.

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