Linear motor

Abstract

Provided in the present application is a linear motor, comprising a housing having an accommodating space, and, a vibrator assembly, a stator assembly and an elastic assembly which are accommodated in the accommodating space. The elastic assembly is used for suspending and supporting the vibrator assembly in the accommodating space. The vibrator assembly comprises a central magnetic steel part. The stator assembly comprises a coil part and auxiliary magnetic steel parts, which are arranged in a first direction; the coil part is sleeved on the middle portion of the periphery of the central magnetic steel part; the auxiliary magnetic steel parts are respectively arranged at two end portions of the central magnetic steel part; after the coil part is energized, the vibrator assembly is pushed to vibrate in the first direction, and the auxiliary magnetic steel parts and the elastic assembly jointly provide a restoring force for the vibrator assembly, such that the vibrator assembly reciprocates in the first direction. The linear motor of the present application can improve the sensation of low-frequency vibration, improve the overall stability and reliability of motors, and achieve effective control of production costs.

Description

Linear motor TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, in particular to a linear vibration motor. BACKGROUND

[0002] With the development of electric machine technology, the vibration of the traditional X-axis linear motor in the high frequency field can meet most customer needs, but the vibration of the traditional X-axis linear motor in the low frequency field is not satisfactory. There is still a certain gap between the performance of the existing product and customer needs. The minimum base frequency of the X-axis linear motor currently maturely applied in the mobile phone field is about 130 Hz. Under the same size, the low frequency vibration has encountered a bottleneck, and the optimization of the performance structure of the traditional material has limited improvement on the low frequency vibration, and the cost is relatively high. However, the market demand for low frequency motors is booming at present, such as a series of application scenarios such as wearable watches, mobile phones, handheld consoles, game controllers and vehicle seat headrests. The electric machines applied in these fields usually require a base frequency of about 60-90 Hz, which is lower than the frequency of the current mainstream linear motor. In the face of huge market demand, the low frequency performance of the existing electric machine still needs to be further improved.

[0003] Therefore, it is necessary to provide a linear motor which can effectively improve the low frequency vibration and at the same time take into account the cost and process manufacturing. TECHNICAL PROBLEM

[0004] The purpose of the present application is to provide a linear motor to solve the technical problem of poor low frequency vibration of the linear motor in the prior art. TECHNICAL SOLUTION

[0005] The technical solution of the present application is as follows:

[0006] In a first aspect, the present application provides a linear motor, comprising a housing having a receiving space, and a vibrator assembly, a stator assembly and an elastic assembly received in the receiving space, the elastic assembly being used to suspend and support the vibrator assembly in the receiving space; wherein the vibrator assembly comprises a center magnetic steel part; the stator assembly comprises a coil part arranged in a first direction and an auxiliary magnetic steel part, the coil part is sleeved in the outer circumferential middle part of the center magnetic steel part, and the two end parts of the center magnetic steel part are respectively provided with the auxiliary magnetic steel part, the coil part is energized to push the vibrator assembly to vibrate along the first direction, and the auxiliary magnetic steel part and the elastic assembly jointly provide a restoring force for the vibrator assembly to make the vibrator assembly reciprocate along the first direction.

[0007] Each of the auxiliary magnetic steel portions respectively comprises a first auxiliary magnetic steel group and / or a second auxiliary magnetic steel group, the first auxiliary magnetic steel group comprises two first auxiliary magnetic steels arranged along a second direction and respectively arranged at both sides of the end portion of the central magnetic steel portion, the second auxiliary magnetic steel group comprises two second auxiliary magnetic steels arranged along a third direction and respectively arranged at both sides of the end portion of the central magnetic steel portion, and the first direction, the second direction and the third direction are arranged perpendicularly two by two.

[0008] Preferably, the central magnetic steel portion comprises a first magnetic steel, an iron core and a second magnetic steel arranged along the first direction, and the first magnetic steel and the second magnetic steel are symmetrically arranged at both sides of the iron core.

[0009] Preferably, the first magnetic steel and the second magnetic steel are magnetized along the first direction and the magnetic poles thereof are arranged oppositely in the same manner.

[0010] Preferably, the two first auxiliary magnetic steels are magnetized along the second direction and the magnetic poles thereof are arranged oppositely in the same manner, the two second auxiliary magnetic steels are magnetized along the third direction and the magnetic poles thereof are arranged oppositely in the same manner, and the first auxiliary magnetic steel and the second auxiliary magnetic steel are arranged oppositely in the same manner with the central magnetic steel portion.

[0011] Preferably, the vibrator assembly further comprises a mass fixed to the end portion of the central magnetic steel portion along the first direction, and each of the masses is connected with the elastic assembly.

[0012] Preferably, the elastic assembly comprises two elastic sheets arranged along the first direction, one of the elastic sheets is arranged between the end portion of the vibrator assembly and the shell, the other of the elastic sheets is arranged between the other end portion of the vibrator assembly and the shell, the two elastic sheets are respectively in V-shaped structure, and the opening ends of the two elastic sheets are arranged oppositely.

[0013] Preferably, each of the elastic sheets respectively comprises an elastic arm, and a first connecting arm and a second connecting arm respectively extended from the elastic arm, the first connecting arm is used for connecting with the vibrator assembly, the second connecting arm is used for connecting with the shell, and the elastic assembly further comprises a first insert piece, a second insert piece and a third insert piece fixed to the elastic sheet and arranged along the first direction, the first insert piece is fixed to the side of the first connecting arm away from the vibrator assembly, the second insert piece is fixed to the side of the second connecting arm away from the shell, and the third insert piece is fixed to the side of the second connecting arm close to the shell.

[0014] Preferably, the linear motor further comprises a circuit board at least partially accommodated in the accommodation space, and the circuit board is electrically connected with the coil portion.

[0015] Preferably, the linear motor comprises one or more of the center magnetic steel parts; the number of the coil parts is equal to the number of the center magnetic steel parts, and the coil parts are arranged one by one corresponding to the center magnetic steel parts; in the case that the linear motor comprises a plurality of the center magnetic steel parts, the plurality of the center magnetic steel parts are sequentially fixed end to end in one body along the first direction; one of the auxiliary magnetic steel parts is arranged at the head end of the center magnetic steel part at the head end, one of the auxiliary magnetic steel parts is arranged at the tail end of the center magnetic steel part at the tail end, and the rest of the auxiliary magnetic steel parts are arranged corresponding to the end parts of the adjacent two center magnetic steel parts. Advantages

[0016] The linear motor of the present application has the following advantages: in the initial state, the magnetic circuit of the linear motor has a zero resultant force, and the vibrator assembly is balanced; when the coil part is energized, the vibrator assembly can be pushed to vibrate along the first direction; the auxiliary magnetic steel part and the elastic assembly jointly provide a restoring force for the vibrator assembly to make the vibrator assembly reciprocate along the first direction; the magnetic interaction force between the auxiliary magnetic steel part and the center magnetic steel part can increase the negative stiffness, thereby reducing the resonance frequency of the linear motor and improving the low-frequency vibration feeling; at the same time, the auxiliary magnetic steel part does not affect the vibration path of the vibrator assembly and does not occupy the design size in the first direction, so it does not increase the size of the linear motor, and can improve the attenuation of the electromagnetic driving force under large stroke, so that the motor has a stable input performance in the stroke; in addition, the process and thickness requirements of the elastic assembly can be relaxed, the stability and reliability of the motor as a whole are improved, the auxiliary magnetic steel part has a simple structure and is easy to process, and the cost is low, so the production cost can be effectively controlled. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is a structural schematic diagram of the linear motor of the embodiment of the present application.

[0018] Fig. 2 is an exploded view of the linear motor shown in Fig. 1.

[0019] Fig. 3 is a top view of the linear motor shown in Fig. 1.

[0020] Fig. 4 is an A-A sectional view of Fig. 3.

[0021] Fig. 5 is a structural schematic diagram of the linear motor shown in Fig. 3 with the cover part removed.

[0022] Fig. 6 is another perspective view of the linear motor shown in Fig. 5.

[0023] Fig. 7 is a magnetic circuit principle diagram of the linear motor shown in Fig. 1.

[0024] Fig. 8 is a comparison diagram of the steady-state vibration amount of the embodiment and the comparative example shown in Fig. 1.

[0025] Fig. 9 is a schematic diagram of a partial structure of a linear motor according to an embodiment of the present application.

[0026] Wherein: 10-linear motor (1-housing (101-housing space, 102-shell, 103-cover), 2-vibrator assembly (201-center magnetic steel part (2011-first magnetic steel, 2012-iron core, 2013-second magnetic steel), 202-mass), 3-stator assembly (301-coil part, 302-assistant magnetic steel part (3021-first assistant magnetic steel group (30211-first assistant magnetic steel))), 4-elastic assembly (401-elastic sheet (4011-elastic arm, 4012-first connecting arm, 4013-second connecting arm), 402-first insert sheet, 403-second insert sheet, 404-third insert sheet), 5-circuit board). Embodiments of the present application

[0027] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] An embodiment of the present application provides a linear motor 10, which comprises a housing 1, a vibrator assembly 2, a stator assembly 3 and an elastic assembly 4, please refer to Figs. 1-7 and Fig. 9. The housing 1 has a housing space 101. Wherein, the stator assembly 3 is fixed in the housing space 101, the vibrator assembly 2 is suspended in the housing space 101, and the elastic assembly 4 is used to suspend and support the vibrator assembly 2 in the housing space 101. The vibrator assembly 2 comprises a center magnetic steel part 201. The stator assembly 3 comprises a coil part 301 and an assistant magnetic steel part 302. The coil part 301 and the assistant magnetic steel part 302 are arranged along a first direction. The coil part 301 is sleeved in the outer circumferential middle part of the center magnetic steel part 201, and the two ends of the center magnetic steel part 201 are respectively provided with the assistant magnetic steel part 302. After the coil part 301 is electrified, the vibrator assembly 2 is pushed to vibrate along the first direction, and the assistant magnetic steel part 302 and the elastic assembly 4 jointly provide a restoring force for the vibrator assembly 2, so that the vibrator assembly 2 reciprocates along the first direction.

[0029] In some examples, the first direction can be the X-axis.

[0030] In the embodiments of the present application, referring to FIG. 2, FIG. 4 and FIG. 7, the coil part 301 can drive the vibrator assembly 2 to vibrate in the first direction when the coil part 301 is energized, and the auxiliary magnetic steel part 302 and the elastic assembly 4 jointly provide the restoring force for the vibrator assembly 2 to reciprocate in the first direction. The magnetic interaction force between the auxiliary magnetic steel part 302 and the central magnetic steel part 201 can increase the negative stiffness, thereby reducing the resonance frequency of the linear motor 10 and improving the low-frequency vibration feeling. Meanwhile, the auxiliary magnetic steel part 302 does not affect the vibration path of the vibrator assembly 2 and does not occupy the design size in the first direction, so it does not increase the size of the linear motor 10. Compared with the conventional motor, the linear motor 10 can be designed with a large stroke and improved low-frequency vibration feeling. Moreover, the attenuation of the electromagnetic driving force under the large stroke can be improved, so that the motor has a relatively stable input performance in the stroke. In addition, the elastic assembly 4 does not need to be designed to be softer to reduce the stiffness of the motor system, so the process and thickness requirements of the elastic assembly 4 can be relaxed, thereby improving the stability and reliability of the motor as a whole. Moreover, the negative stiffness of the motor system can be adjusted by controlling the size and magnetism of the auxiliary magnetic steel part 302, and the auxiliary magnetic steel part 302 has a simple structure, is easy to process and has low cost, so the production cost can be effectively controlled.

[0031] As an example, referring to FIG. 7, in the initial state, the magnetic force of the linear motor 10 is zero, and the vibrator assembly 2 is balanced and located at the center position. When the coil part 301 is energized, the vibrator assembly 2 is driven to swing in the first direction, the magnetic resistance between the auxiliary magnetic steel part 302 and the central magnetic steel part 201 changes, the magnetic interaction force of the two auxiliary magnetic steel parts 302 on the central magnetic steel part 201 is unbalanced, the magnetic interaction force of one side of the auxiliary magnetic steel part 302 increases, and the magnetic interaction force of the other side of the auxiliary magnetic steel part 302 decreases, so that when the central magnetic steel part 201 deviates from the center position in the first direction, an unbalanced magnetic interaction force F in the first direction is generated. By controlling the position and size of the auxiliary magnetic steel part 302, the magnetic interaction force F can change linearly with the deviation from the center position. Referring to FIG. 8, the low-frequency vibration feeling of the linear motor 10 of the present application is significantly improved compared with the low-frequency vibration feeling of the conventional motor of the comparative example.

[0032] In some preferred embodiments, referring to FIG. 2, FIG. 4 and FIG. 7, the central magnetic steel part 201 includes a first magnetic steel 2011, an iron core 2012 and a second magnetic steel 2013. The first magnetic steel 2011, the iron core 2012 and the second magnetic steel 2013 are sequentially arranged in the first direction, and the first magnetic steel 2011 and the second magnetic steel 2013 are symmetrically arranged on both sides of the iron core 2012. The first magnetic steel 2011 and the second magnetic steel 2013 generate a magnetic field, the coil part 301 generates a driving force in the magnetic field when energized, drives the vibrator assembly 2 to vibrate in the first direction, and the iron core 2012 can enhance the magnetic field to make the driving force larger.

[0033] In some examples, the first magnetic steel 2011 can be a permanent magnet, and the second magnetic steel 2013 can be a permanent magnet.

[0034] It can be understood that, in the initial state, referring to FIG. 4 and FIG. 7, the coil part 301 is arranged symmetrically about the core 2012, which can maximize the use of the magnetic field and generate greater driving force.

[0035] In other embodiments, the core 2012 can also be replaced by a structure of other materials that can enhance the magnetic field.

[0036] In some more preferred embodiments, referring to FIG. 7, the first magnetic steel 2011 and the second magnetic steel 2013 are magnetized along the first direction, and the magnetic poles of the first magnetic steel 2011 and the second magnetic steel 2013 are arranged in the same polarity, thereby generating a strong magnetic field.

[0037] In some examples, referring to FIG. 7, the first magnetic steel 2011 and the second magnetic steel 2013 are magnetized along the first direction, the N pole of the first magnetic steel 2011 is arranged opposite to the N pole of the second magnetic steel 2013, and the magnetic poles of the first magnetic steel 2011 and the second magnetic steel 2013 are arranged in the same polarity, thereby generating a strong magnetic field.

[0038] It can be understood that, in other embodiments, the S pole of the first magnetic steel 2011 can be arranged opposite to the S pole of the second magnetic steel 2013, and the magnetic poles of the auxiliary magnetic steel part 302 are also changed accordingly, which will not be described here.

[0039] In some preferred embodiments, each auxiliary magnetic steel part 302 includes a first auxiliary magnetic steel group 3021 and / or a second auxiliary magnetic steel group. Each first auxiliary magnetic steel group 3021 includes two first auxiliary magnetic steels 30211, the two first auxiliary magnetic steels 30211 are arranged in a second direction and are respectively arranged on both sides of the end of the center magnetic steel part 201. Each second auxiliary magnetic steel group includes two second auxiliary magnetic steels, the two second auxiliary magnetic steels are arranged in a third direction and are respectively arranged on both sides of the end of the center magnetic steel part 201. The first direction, the second direction and the third direction are arranged perpendicular to each other. The specific structure of the auxiliary magnetic steel part 302 can be determined according to the required negative stiffness size.

[0040] In some examples, referring to FIG. 2, FIG. 4, FIG. 7 and FIG. 9, each auxiliary magnetic steel part 302 can include a first auxiliary magnetic steel group 3021. Each first auxiliary magnetic steel group 3021 includes two first auxiliary magnetic steels 30211, the two first auxiliary magnetic steels 30211 are arranged in a second direction and are respectively arranged on both sides of the end of the center magnetic steel part 201.

[0041] It can be understood that in other embodiments, each auxiliary magnetic steel part 302 can include a second auxiliary magnetic steel group. Each second auxiliary magnetic steel group includes two second auxiliary magnetic steels, the two second auxiliary magnetic steels are arranged along a third direction, and the two second auxiliary magnetic steels are respectively arranged on both sides of the end of the central magnetic steel part 201. Alternatively, in other embodiments, each auxiliary magnetic steel part 302 can simultaneously include a first auxiliary magnetic steel group 3021 and a second auxiliary magnetic steel group, and the specific structure of the auxiliary magnetic steel part 302 can be determined according to the required negative stiffness size, which will not be repeated here.

[0042] As an example, referring to FIG. 7, the two first auxiliary magnetic steels 30211 of the first auxiliary magnetic steel group 3021 are magnetized along the second direction respectively, and the magnetic poles of the two first auxiliary magnetic steels 30211 are arranged in the same polarity. At the same time, the two first auxiliary magnetic steels 30211 are also arranged in the same polarity with the central magnetic steel part 201, and by using the same pole repulsion principle, repulsive force is generated to form a magnetic spring system, so that the auxiliary magnetic steel part 302 and the elastic assembly 4 can jointly provide a restoring force for the vibrator assembly 2 to reciprocate along the first direction, and the magnetic interaction force between the auxiliary magnetic steel part 302 and the central magnetic steel part 201 can increase the negative stiffness, thereby reducing the resonance frequency of the linear motor 10 and improving the low-frequency vibration feeling.

[0043] In one example, referring to FIG. 7, the first magnetic steel 2011 and the second magnetic steel 2013 are magnetized along the first direction, the N pole of the first magnetic steel 2011 is arranged opposite to the N pole of the second magnetic steel 2013, and the magnetic poles of the first magnetic steel 2011 and the second magnetic steel 2013 are arranged in the same polarity, thereby generating a strong magnetic field. The four first auxiliary magnetic steels 30211 of the two auxiliary magnetic steel parts 302 are magnetized along the second direction respectively, and the S poles of the two first auxiliary magnetic steels 30211 of one of the auxiliary magnetic steel parts 302 are arranged opposite to the S pole of the first magnetic steel 2011 respectively, and the S poles of the two first auxiliary magnetic steels 30211 of the other auxiliary magnetic steel part 302 are arranged opposite to the S pole of the second magnetic steel 2013 respectively, and by using the same pole repulsion principle, repulsive force is generated to form a magnetic spring system, so that the auxiliary magnetic steel part 302 and the elastic assembly 4 can jointly provide a restoring force for the vibrator assembly 2 to reciprocate along the first direction, and the magnetic interaction force between the auxiliary magnetic steel part 302 and the central magnetic steel part 201 can increase the negative stiffness, thereby reducing the resonance frequency of the linear motor 10 and improving the low-frequency vibration feeling.

[0044] As an example, the two second auxiliary magnetic steels of the second auxiliary magnetic steel group are magnetized along the third direction, and the two second auxiliary magnetic steels are arranged in the same polarity. At the same time, the two second auxiliary magnetic steels are also arranged in the same polarity with the center magnetic steel part 201, and the repulsive force is generated by the same-pole repulsion principle to form a magnetic spring system, so that the auxiliary magnetic steel part 302 and the elastic assembly 4 can jointly provide a restoring force for the vibrator assembly 2 to make the vibrator assembly 2 reciprocate along the first direction. In addition, the magnetic interaction force between the auxiliary magnetic steel part 302 and the center magnetic steel part 201 can increase the negative stiffness, thereby reducing the resonance frequency of the linear motor 10 and improving the low-frequency vibration feeling.

[0045] In some examples, the first auxiliary magnetic steel 30211 can be a permanent magnet, and the second auxiliary magnetic steel can also be a permanent magnet.

[0046] In some preferred embodiments, please refer to FIG. 2, FIG. 4 and FIG. 6, the vibrator assembly 2 further comprises a mass 202. The mass 202 can be fixed to the two end portions of the center magnetic steel part 201 along the first direction, and each mass 202 is connected with the elastic assembly 4. In this embodiment, the mass 202 can provide a larger vibration amount for the vibrator assembly 2.

[0047] As an example, please refer to FIG. 2 and FIG. 4, the vibrator assembly 2 can comprise two masses 202 arranged along the first direction. One mass 202 is fixed to one end portion of the center magnetic steel part 201, and the other mass 202 is fixed to the other end portion of the center magnetic steel part 201. The two masses 202 can be arranged symmetrically about the center magnetic steel part 201, so that the overall structure is more stable.

[0048] It can be understood that in other embodiments, the vibrator assembly 2 can also not comprise a mass 202, which is determined according to actual needs.

[0049] In some preferred embodiments, referring to FIG. 2 and FIG. 4 to FIG. 7, the elastic assembly 4 comprises two elastic sheets 401 arranged along the first direction. One of the elastic sheets 401 is arranged between the one end of the vibrator assembly 2 and the housing 1, and the other elastic sheet 401 is arranged between the other end of the vibrator assembly 2 and the housing 1. The two elastic sheets 401 are V-shaped, and the open ends of the two elastic sheets 401 are arranged in opposite directions. In this embodiment, the elastic sheet 401 provides spring stiffness, and the magnetic force generated by the auxiliary magnetic steel part 302 on the central magnetic steel part 201 of the vibrator assembly 2 can increase the negative stiffness of the system. Moreover, due to the arrangement of the auxiliary magnetic steel part 302, the soft elastic sheet 401 is not required to increase the negative stiffness, which can relax the process and thickness requirements of the elastic sheet 401, and improve the stability and reliability of the motor as a whole. Within the range of the stability and reliability of the elastic sheet 401, the stroke of the motor can be appropriately increased, thereby improving the low-frequency vibration feeling.

[0050] In some more preferred embodiments, referring to FIG. 2, each elastic sheet 401 comprises an elastic arm 4011, a first connecting arm 4012 and a second connecting arm 4013. The first connecting arm 4012 and the second connecting arm 4013 are respectively formed by extending from the two ends of the elastic arm 4011. The first connecting arm 4012 is arranged to connect with the vibrator assembly 2, and the second connecting arm 4013 is arranged to connect with the housing 1.

[0051] In some examples, referring to FIG. 2, FIG. 5 and FIG. 6, in order to protect the elastic sheet 401, the elastic assembly 4 can further comprise a first insert 402, a second insert 403 and a third insert 404. The first insert 402 is fixed to the side of the first connecting arm 4012 away from the vibrator assembly 2, the second insert 403 is fixed to the side of the second connecting arm 4013 away from the housing 1, and the third insert 404 is fixed to the side of the second connecting arm 4013 close to the housing 1, thereby preventing the first connecting arm 4012 and the second connecting arm 4013 from stress deformation.

[0052] For example, the projections of the first insert 402, the second insert 403 and the third insert 404 along the first direction can coincide, and the projections of the first insert 402, the second insert 403 and the third insert 404 along the first direction can at least partially coincide with the projections of the first connecting arm 4012 and the second connecting arm 4013 along the first direction, or even completely coincide, thereby more fully protecting the elastic sheet 401.

[0053] In some preferred embodiments, referring to FIGS. 1-3, 5 and 6, the linear motor 10 further comprises a circuit board 5 electrically connected with the coil part 301, which can provide the coil part 301 with alternating current. In order to protect the circuit board 5 and make the overall structure more stable, the circuit board 5 can be at least partially accommodated in the accommodation space 101.

[0054] As an example, the circuit board 5 can be a flexible printed circuit (FPC), which is more convenient for assembly.

[0055] In some preferred embodiments, referring to FIGS. 2 and 9, the linear motor 10 comprises one or more center magnetic steel parts 201. The number of coil parts 301 is equal to the number of center magnetic steel parts 201, and the coil parts 301 are arranged one by one corresponding to the center magnetic steel parts 201. Referring to FIG. 9, in the case where the linear motor 10 comprises a plurality of center magnetic steel parts 201, all the center magnetic steel parts 201 are sequentially fixed in one body along the first direction. The auxiliary magnetic steel parts 302 are arranged corresponding to the ends of the adjacent two center magnetic steel parts 201. That is, the center magnetic steel parts 201 can be stacked, and the auxiliary magnetic steel parts 302 are also changed accordingly for stacking.

[0056] In some examples, referring to FIGS. 2 and 4-7, the linear motor 10 comprises one center magnetic steel part 201, one coil part 301 and two auxiliary magnetic steel parts 302.

[0057] In some examples, referring to FIG. 9, the linear motor 10 comprises a plurality of center magnetic steel parts 201, a plurality of coil parts 301 and a plurality of auxiliary magnetic steel parts 302. The number of coil parts 301 is equal to the number of center magnetic steel parts 201, and one coil part 301 corresponds to one center magnetic steel part 201. All the center magnetic steel parts 201 are sequentially fixed in one body along the first direction. One of the auxiliary magnetic steel parts 302 is arranged corresponding to the head end of the auxiliary magnetic steel part 302 at the head end, one of the auxiliary magnetic steel parts 302 is arranged corresponding to the tail end of the auxiliary magnetic steel part 302 at the tail end, and the rest of the auxiliary magnetic steel parts 302 are arranged corresponding to the ends of the adjacent two center magnetic steel parts 201.

[0058] In some preferred embodiments, referring to FIGS. 1-4, in order to facilitate assembly, the shell 1 comprises a shell part 102 and a cover part 103 covering the shell part 102, and the shell part 102 and the cover part 103 jointly form the accommodation space 101.

[0059] The linear motor 10 of the embodiments of the present application can be applied in the fields of watches, mobile phones, handheld game consoles, handles, augmented reality (AR), virtual reality (VR) and vehicle-mounted devices, etc.

[0060] The above merely provides an example of the present application, and it should be pointed out that those skilled in the art can make modifications without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. Linear motor, characterized in that The linear motor comprises a shell with a receiving space, a vibrator assembly, a stator assembly and an elastic assembly received in the receiving space, and the elastic assembly is used for suspending and supporting the vibrator assembly in the receiving space; wherein the vibrator assembly comprises a central magnetic steel part; the stator assembly comprises a coil part arranged along a first direction and an auxiliary magnetic steel part, the coil part is sleeved in the outer circumferential middle part of the central magnetic steel part, two end parts of the central magnetic steel part are respectively provided with the auxiliary magnetic steel part, the coil part drives the vibrator assembly to vibrate along the first direction after being electrified, and the auxiliary magnetic steel part and the elastic assembly jointly provide a restoring force for the vibrator assembly to make the vibrator assembly reciprocate along the first direction. Each of the auxiliary magnetic steel parts respectively comprises a first auxiliary magnetic steel group and / or a second auxiliary magnetic steel group, the first auxiliary magnetic steel group comprises two first auxiliary magnetic steels arranged along a second direction and respectively arranged on both sides of the end part of the central magnetic steel part, and the second auxiliary magnetic steel group comprises two second auxiliary magnetic steels arranged along a third direction and respectively arranged on both sides of the end part of the central magnetic steel part, and the first direction, the second direction and the third direction are arranged perpendicularly in pairs. The central magnetic steel part comprises a first magnetic steel, an iron core and a second magnetic steel arranged along the first direction, and the first magnetic steel and the second magnetic steel are symmetrically arranged on both sides of the iron core.

2. The linear motor of claim 1, wherein, The first magnetic steel and the second magnetic steel are magnetized along the first direction and the magnetic poles thereof are arranged in the same polarity.

3. The linear motor of claim 2, wherein, The two first auxiliary magnetic steels are magnetized along the second direction and the magnetic poles thereof are arranged in the same polarity, the two second auxiliary magnetic steels are magnetized along the third direction and the magnetic poles thereof are arranged in the same polarity, and the first auxiliary magnetic steel and the second auxiliary magnetic steel are respectively arranged in the same polarity with the central magnetic steel part.

4. The linear motor of claim 1, wherein, The vibrator assembly further comprises a mass fixed to the two end parts of the central magnetic steel part along the first direction, and each of the masses is connected with the elastic assembly.

5. The linear motor of claim 1, wherein, The elastic assembly comprises two elastic sheets arranged along the first direction, one of the elastic sheets is arranged between one end part of the vibrator assembly and the shell, the other elastic sheet is arranged between the other end part of the vibrator assembly and the shell, the two elastic sheets are respectively V-shaped structures, and the opening ends of the two elastic sheets are arranged in opposite directions.

6. The linear motor of claim 1, wherein, Each of the elastic sheets respectively comprises an elastic arm, a first connecting arm and a second connecting arm respectively extended from the elastic arm, the first connecting arm is used for connecting with the vibrator assembly, the second connecting arm is used for connecting with the shell, and the elastic assembly further comprises a first insert piece, a second insert piece and a third insert piece fixed to the elastic sheet and arranged along the first direction, wherein the first insert piece is fixed to one side of the first connecting arm away from the vibrator assembly, the second insert piece is fixed to one side of the second connecting arm away from the shell, and the third insert piece is fixed to one side of the second connecting arm close to the shell.

7. A linear motor as claimed in claim 6, characterised in that, The linear motor further comprises a circuit board at least partially received in the receiving space, and the circuit board is electrically connected with the coil part.

8. The linear motor of claim 1, wherein, ​ 9. The linear motor of claim 1, wherein, The linear motor comprises one or more center magnetic steel parts; the number of the coil parts is equal to the number of the center magnetic steel parts, and the coil parts are arranged one by one corresponding to the center magnetic steel parts; in the case that the linear motor comprises a plurality of center magnetic steel parts, the plurality of center magnetic steel parts are sequentially fixed in one body in the first direction with the first end connected to the tail end; one of the auxiliary magnetic steel parts is arranged at the first end of the corresponding first end of the center magnetic steel part, one of the auxiliary magnetic steel parts is arranged at the tail end of the corresponding tail end of the center magnetic steel part, and the remaining auxiliary magnetic steel parts are arranged at the end part corresponding to the connection of the adjacent two center magnetic steel parts.

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