CN110994935A - Linear vibration motor with four permanent magnet structures - Google Patents

Abstract

The utility model provides a linear vibration motor with four permanent magnet structures, including upper housing and lower casing, be provided with the active cell subassembly in upper housing and the lower casing and with the corresponding complex stator module of active cell subassembly, the active cell subassembly includes two first permanent magnets with the corresponding complex of stator module, two first permanent magnets are arranged along the X direction, are provided with two enhancement permanent magnets along the Z direction between two first permanent magnets. This openly adopts four permanent magnet structures, has increased magnetic field intensity, has promoted the drive power of active cell subassembly vibration, has improved energy utilization, can also guarantee that the magnetic field of two first permanent magnet tops is unanimous basically rather than the magnetic field of below to improve vibration effect, stability and the reliability of product, prolonged the life of product.

Description

Linear vibration motor with four permanent magnet structures

Technical Field

The present disclosure relates to the field of motor technology, and more particularly, to a linear vibration motor having a four-permanent magnet structure.

Background

With the rapid development of electronic products, especially mobile terminal devices such as mobile phones and tablet computers, these electronic devices basically use a vibration generating device for preventing noise from the electronic device from interfering with others. The traditional vibration generating device adopts a rotor motor based on eccentric rotation, and realizes mechanical vibration through the rotation of an eccentric vibrator, because the eccentric vibrator generates mechanical friction, electric sparks and the like in the rotating process, a commutator and an electric brush can influence the rotating speed of the eccentric vibrator, and further the vibration effect of the device is influenced, therefore, the vibration generating device adopts a linear motor with better performance.

Linear motors, also called linear motors, push rod motors, etc., the most commonly used types of linear motors are flat plate type, U-shaped slot type, and tube type, which are technologies for converting electric energy into linear motion mechanical energy, and suspend a moving element by repulsive force of a magnet, and directly drive the moving element by magnetic force, without transmission via a transmission mechanism such as a gear set, as in a rotary motor, so that the linear motor can make the moving element driven by the linear motor perform reciprocating motion of high acceleration and deceleration, and by this characteristic, the linear motor can be applied to various manufacturing and processing technical fields, and used as a driving power source or as a technical content for providing positioning. In addition, with the rapid development and strong competition of industries such as semiconductor, electronic, photoelectric, medical equipment and automation control, the requirement for linear motion performance of motors in various fields is increasing, and the motors are expected to have high speed, low noise and high positioning accuracy, so that linear motors are used in many applications to replace mechanical motion methods such as conventional servo motors.

However, some existing linear motors have certain defects in structural design, so that the problems of low energy utilization rate, small driving force, unstable motion, large overall structure, collision of the mover against the casing, noise generation and the like of the linear motor are caused, the vibration effect of the linear motor is poor, the stability and reliability are low, the service life is short, the cost is high and the like, and the application and development of the linear motor are influenced.

Disclosure of Invention

The present disclosure is directed to the above problems of the conventional linear motor, and provides a linear vibration motor having a four-permanent magnet structure.

In order to solve at least one of the above technical problems, the present disclosure proposes the following technical solutions:

the utility model provides a linear vibration motor with four permanent magnet structures, including upper housing and lower casing, be provided with the active cell subassembly in upper housing and the lower casing and with the corresponding complex stator module of active cell subassembly, the active cell subassembly is located stator module's top, the active cell subassembly includes two first permanent magnets with the corresponding complex of stator module, two first permanent magnets are arranged along the X direction, be provided with two enhancement permanent magnets along the Z direction between two first permanent magnets, two first permanent magnets magnetize and magnetize opposite direction along the Z direction, two enhancement permanent magnets magnetize and magnetize opposite direction along the X direction.

The beneficial effects of this disclosure are: in the use, two first permanent magnet interact through stator module and active cell subassembly, thereby make the active cell subassembly carry out reciprocal linear motion along the X direction, two first permanent magnets and two enhancement permanent magnet between them form four permanent magnet structures, two strengthen the permanent magnet and not only increased magnetic field intensity, the drive power of active cell subassembly vibration has been promoted, and can reduce magnetic leakage etc., energy utilization is improved, the magnetic field that can also guarantee two first permanent magnet tops is unanimous basically rather than the magnetic field of below, thereby the vibration effect of product has been improved, stability and reliability, the life of product has been prolonged, the cost is reduced, and then the application and the development of product have been enlarged.

In some embodiments, the stator assembly includes a first coil correspondingly engaged with the two first permanent magnets and a first FPC board for connecting the first coil with an external circuit, and the first FPC board is fixed to the lower case.

In some embodiments, the mover assembly further includes a mass, and the two first permanent magnets and the two reinforcing permanent magnets are disposed on the mass.

In some embodiments, the two first permanent magnets and the two reinforcing permanent magnets are connected together, and the mass block is provided with a first hole body for accommodating the two first permanent magnets, and the first hole body penetrates through the mass block along the Z direction.

In some embodiments, the top of the mass is provided with a pole piece cooperating with two first permanent magnets, which are located below the pole piece.

In some embodiments, the mass block is provided with a first avoidance groove for accommodating the pole piece, and the first hole body is located on the bottom surface of the first avoidance groove.

In some embodiments, two ends of the mover assembly in the X direction are respectively elastically connected to the upper case by a spring.

In some embodiments, the spring is V-shaped, and two sides of the spring are respectively connected with the mover assembly and the upper housing.

In some embodiments, the joints of the spring with the mover assembly and the upper case are provided with reinforcing plates, respectively.

In some embodiments, one side of the spring is provided with a buffer sheet on the inner side to match with the other side of the spring.

In addition, in the technical solutions of the present disclosure, the technical solutions can be implemented by adopting conventional means in the art, unless otherwise specified.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is an exploded view of a linear vibration motor having a four permanent magnet structure according to an embodiment of the present disclosure.

Fig. 2 is a perspective view of a linear vibration motor having a four permanent magnet structure according to an embodiment of the present disclosure.

Fig. 3 is a cross-sectional view of a linear vibration motor having a four permanent magnet structure according to an embodiment of the present disclosure.

Fig. 4 is a perspective view of a linear vibration motor with a four permanent magnet structure, with an upper housing removed, according to an embodiment of the present disclosure.

Fig. 5 is a perspective view of a spring provided in an embodiment of the present disclosure.

The numbers in the figures indicate that the upper case 1, the first groove 101, the lower case 2, the supporting portion 21, the mover assembly 3, the first permanent magnet 31, the mass block 32, the first hole 321, the first avoiding groove 322, the second avoiding groove 323, the reinforcing permanent magnet 33, the pole piece 34, the stator assembly 4, the first coil 41, the first FPC board 42, the extension 421, the spring 5, the buffer sheet 51, the reinforcing sheet 52, and the first connecting portion 53.

Detailed Description

In order to make the objects, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of some, but not all, embodiments of the disclosure and are not to be considered as limiting the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "both ends", "both sides", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present disclosure and simplifying the description, but do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure. Furthermore, the terms "first," "second," "upper," "lower," "primary," "secondary," and the like are used for descriptive purposes only and may be used for purposes of simplicity in more clearly distinguishing between various components and not to indicate or imply relative importance.

In the description of the present disclosure, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.

Fig. 1 is an exploded view of a linear vibration motor having a four permanent magnet structure according to an embodiment of the present disclosure, fig. 2 is a perspective view of a linear vibration motor having a four permanent magnet structure according to an embodiment of the present disclosure, fig. 3 is a cross-sectional view of a linear vibration motor having a four permanent magnet structure according to an embodiment of the present disclosure, fig. 4 is a perspective view of a linear vibration motor having a four permanent magnet structure according to an embodiment of the present disclosure with an upper case removed, and fig. 5 is a perspective view of a spring according to an embodiment of the present disclosure.

In the present disclosure, an X direction and a Z direction are given, the Z direction is a vertical direction, the X direction is a horizontal direction, the X direction is a vibration direction of the mover assembly, and the "up" and "down" in the text are all based on the Z direction.

Example (b):

as shown in fig. 1 to 5, a linear vibration motor having a four permanent magnet structure includes a casing including an upper casing 1 and a lower casing 2, and the upper casing 1 and the lower casing 2 are generally welded together. The upper casing 1 and the lower casing 2 are internally provided with a rotor component 3 and a stator component 4 correspondingly matched with the rotor component 3, the stator component 4 is usually arranged on the lower casing 2, the rotor component 3 is positioned above the stator component 4, the rotor component 3 comprises two first permanent magnets 31 correspondingly matched with the stator component 4, the two first permanent magnets 31 are arranged along the X direction, two reinforced permanent magnets 33 are arranged between the two first permanent magnets 31 along the Z direction, namely the two first permanent magnets 31 and the two reinforced permanent magnets 33 form a four-permanent-magnet structure, the two first permanent magnets 31 are magnetized along the Z direction and have opposite magnetizing directions, the two reinforced permanent magnets 33 are magnetized along the X direction and have opposite magnetizing directions, the two reinforced permanent magnets 33 not only increase the magnetic field intensity, improve the driving force of the rotor component 3 for vibration, have better vibration effect, but also can reduce magnetic leakage and the like, the energy utilization rate is improved, and the magnetic field above the two first permanent magnets 31 can be basically consistent with the magnetic field below the two first permanent magnets, so that the stability and the reliability of the product are improved.

Generally, the size, height, etc. of the two reinforcing permanent magnets 33 are determined according to specific conditions, the two reinforcing permanent magnets 33 may be equal in size and symmetrically arranged, or may be different in size, the two reinforcing permanent magnets 33 may be respectively connected to the first permanent magnets 31 on both sides thereof, or may be respectively spaced from the first permanent magnets 31 on both sides thereof by a proper distance, the two reinforcing permanent magnets 33 may be connected together, or a proper distance may be left between the two reinforcing permanent magnets 33.

The permanent magnet is a magnet capable of retaining high remanence for a long time in an open circuit state, is also called a hard magnet, such as magnetic steel, a neodymium magnet, a permanent magnet made of ferrite permanent magnet material and the like, and is generally selected from the magnetic steel which has the characteristics of high hardness, high coercive force value, high temperature resistance, strong corrosion resistance and the like.

The stator assembly 4 includes a first coil 41 correspondingly engaged with the two first permanent magnets 31 and a first FPC board 42 for connecting the first coil 41 with an external circuit, the first FPC board 42 is fixed on the lower casing 2, the first FPC board 42 is usually adhered to the lower casing 2, the first coil 41 is usually adhered to the first FPC board 42, and a lead of the first coil 41 is usually welded to a corresponding portion of the first FPC board 42. When the magnetic motor is used, the first coil 41 is in a magnetic field generated by the first permanent magnet 31 of the mover assembly 3, after the first coil 41 is electrified by the external circuit through the first FPC board 42, the first coil 41 is subjected to a certain ampere force, the first coil 41 interacts with the first permanent magnet 31 of the mover assembly 3, and due to the fact that the first coil 41 is fixed, the first permanent magnet 31 performs reciprocating linear motion along the X direction under corresponding reaction force, so that the first coil 41 also cuts magnetic induction lines, and the mover assembly 3 vibrates along the X direction, namely the product vibrates.

The FPC board is a Flexible Printed Circuit (FPC) board which is a highly reliable and excellent Flexible Printed Circuit board made of a polyimide or polyester film as a base material and has the characteristics of high wiring density, light weight, thin thickness and good bendability. Usually, first FPC board 42 includes the upper strata, middle level and lower floor, the upper strata is the protection film of making by insulating material, the lower floor is the substrate of making by insulating material, the middle level is the circuit layer that the copper foil was made, be provided with on the protection film on upper strata and dodge the groove with first coil 41's lead wire matched with, dodge be provided with in the groove with first coil 41's lead wire welded connection's connecting portion, connecting portion are circuit layer partly, first FPC board 42's lower floor is glued on lower casing 2 usually, the thickness of lower floor is greater than the thickness on upper strata usually, the lower floor not only has the middle-level effect of protection like this, and still has the effect of reinforcement, the overall structure intensity of first FPC board 42 has been improved.

The first FPC board 42 generally has an extension portion 421 extending out of the casing, the extension portion 421 is convenient to be connected with an external circuit, a connection portion connected with the external circuit is arranged on the extension portion 421, the connection portion is generally located in a corresponding avoiding groove, so that the structure is more compact, more stable and more reliable, a supporting portion 21 matched with the extension portion 421 is arranged on the lower casing 2, a first groove body 101 used for the extension portion 421 and the supporting portion 21 to penetrate is arranged on the upper casing 1, so that the first FPC board 42 is convenient to be connected with the external circuit, and the structure is more compact and stable.

The mover assembly 3 further includes a mass block 32, the two first permanent magnets 31 and the two reinforcing permanent magnets 33 are disposed on the mass block 32, the mass block 32 is also called a balance block, a vibrating block, a counter weight, and the like, and in the vibrating process, the mass block 32 can improve the vibrating force and the vibrating effect of the mover assembly 3 through self inertia, so that the mover assembly 3 can vibrate more stably and reliably.

It should be noted that the number of the first coils 41 and the first permanent magnets 31 may be determined according to the specific situations such as the size of the motor, the number of the first permanent magnets 31 arranged on the mass block 32 along the X direction may also be more than three, the two adjacent first permanent magnets 31 are magnetized along the Z direction and have opposite magnetizing directions, two reinforcing permanent magnets 33 are symmetrically arranged between the two adjacent first permanent magnets 31 along the Z direction, the two reinforcing permanent magnets 33 between the two adjacent first permanent magnets 31 form a group, the two reinforcing permanent magnets 33 in each group are magnetized along the X direction and have opposite magnetizing directions, in the two adjacent groups, the two reinforcing permanent magnets 33 on the upper layer have opposite magnetizing directions, and the two reinforcing permanent magnets 33 on the lower layer have opposite magnetizing directions, that is, the two adjacent first permanent magnets 31 and the two reinforcing permanent magnets 33 between the two adjacent first permanent magnets 31 form a four-permanent magnet structure, one, two or more four permanent magnet structures may be formed on the mass 32 along the X direction. The stator assembly 4 has more than two first coils 41 arranged along the X direction, the current directions of two adjacent first coils 41 are opposite, the number of the first coils 41 is one less than that of the first permanent magnets 31, one end of the outer first coil 41, which is far away from the adjacent first coil 41, corresponds to one first permanent magnet 31, the outer first coils 41 are the first coils 41 at two ends along the X direction, one end of the adjacent first coils 41, which is close to each other, corresponds to the same first permanent magnet 31, so that the directions of the ampere forces received by each first coil 41 are the same, and the directions of the reaction forces received by each first permanent magnet 31 are also the same, so that the stator assembly 3 can vibrate along the X direction better, and is more stable and reliable. In addition, the width of the first permanent magnet 31 on the outer side along the X direction is half of the width of the other first permanent magnets 31 along the X direction, and the first permanent magnets 31 on the outer side are the first permanent magnets 31 on both ends along the X direction, so that the magnetic field effect on both ends of each first coil 41 can be ensured to be the same.

Two first permanent magnets 31 link together with two enhancement permanent magnets 33, for example adhesive bonding, welded connection etc. are provided with the first hole body 321 of settling two first permanent magnets 31 on the quality piece 32, and first hole body 321 runs through quality piece 32 along the Z direction, is convenient for settle two first permanent magnets 31 and two enhancement permanent magnets 33 through first hole body 321, and it is more convenient to operate, and the structure is compacter, and stability and reliability are higher.

The top of quality piece 32 is provided with pole piece 34 with two first permanent magnet 31 cooperations, two first permanent magnets 31 on the quality piece 32 are located the below of pole piece 34, pole piece 34 is usually sticky or welded on quality piece 32, pole piece 34 is usually by itself not producing the magnetic field, only play the soft magnetic material of magnetic induction line transmission in the magnetic circuit and make, it can retrain the magnetic field that first permanent magnet 31 produced to a certain extent, make the magnetic induction line act on first coil 41 better, the efficiency of response joining has been improved, prevent the magnetic leakage, thereby the utilization efficiency of magnetic induction line has been improved, the utilization efficiency of energy promptly, and then the interact power of first permanent magnet 31 and first coil 41, the vibrational force of product promptly.

The mass block 32 is provided with a first avoiding groove 322 for accommodating the pole piece 34, the first hole 321 is located on the bottom surface of the first avoiding groove 322, and the pole piece 34 is usually glued or welded on the bottom surface of the first avoiding groove 322, so that the structure is more compact and stable, and the volume of the motor is reduced.

The bottom of the mass block 32 is provided with a second avoiding groove 323 matched with the first coil 41 of the stator assembly 4, and the first coil 41 is always positioned in the second avoiding groove 323 in the vibration process of the mass block 32 along the X direction, so that the structure is more compact and stable, and meanwhile, the vibration of the mass block 32 is limited.

Two ends of the mover assembly 3 along the X direction are elastically connected to the upper casing 1 through springs 5, respectively, that is, the mover assembly 3 is suspended in the upper casing 1 through two springs 5, and usually the springs 5 are welded to the mass block 32 of the mover assembly 3 and the upper casing 1, respectively. In the reciprocating vibration process of mover assembly 3 along the X direction, when spring 5 of mover assembly 3 one end was compressed, spring 5 of the other end of mover assembly 3 was stretched in step, so not only can play the effect of buffering protection to the reciprocating motion of mover assembly 3, can provide certain restoring force to the reciprocating vibration of mover assembly 3 moreover to the vibration that makes the motor is more stable, reliable.

Furthermore, the spring 5 is V-shaped, and two sides of the spring 5 are respectively connected with the mass block 32 of the mover assembly 3 and the upper case 1, and are generally connected by welding, so that the structure is simple, the operation is convenient, and the stability is good. In order to facilitate connection, the two sides of the spring 5 are respectively provided with a first connecting portion 53 connected with the mass block 32 and the upper case 1, the first connecting portion 53 is generally parallel to the corresponding connecting portion of the mass block 32 and the upper case 1, so that the operation is more convenient, the stability is better, the reinforcing sheet 52 can be further arranged on the first connecting portion 53, namely, the reinforcing sheet 52 is arranged at the connecting position of the two sides of the spring 5, the mass block 32 and the upper case 1, the connecting strength is higher, and the structure is more stable and reliable. The spring 5 may have any other suitable shape such as an L-shape, U-shape, S-shape, zigzag shape, tower-shape, or W-shape as in the prior art.

Spring 5's one side inboard is provided with rather than another side matched with buffer plate 51, can prevent vibration in-process spring 5's both sides direct impact through buffer plate 51 to play the effect of buffer protection and noise abatement, improved the stability and the reliability of product, prolonged the life of product. Generally, the buffer sheet 51 can be made of polyimide foam board, rubber, polyurethane, foam, silica gel, acrylic rubber and other materials with good buffer performance, the rubber has the advantages of good elasticity, high strength, low price and the like, the polyurethane has the advantages of higher flexibility, rebound resilience, mechanical strength, oxidation stability, excellent oil resistance and the like, and the foam has the advantages of elasticity, light weight, quick pressure-sensitive fixation, convenience in use, free bending, ultrathin volume, reliable performance and the like.

In the using process, the first coil 41 of the stator assembly 4 is in the magnetic field generated by the first permanent magnet 31 of the mover assembly 3, after the first coil 41 is electrified by the external circuit through the first FPC board 42 of the stator assembly 4, the first coil 41 is subjected to a certain ampere force through the interaction between the stator assembly 4 and the first permanent magnet 31 of the mover assembly 3, the first coil 41 interacts with the first permanent magnet 31 of the mover assembly 3, and the first coil 41 is fixed, so that the first permanent magnet 31 linearly moves in the X direction under the corresponding reaction force, and the first coil 41 also cuts the magnetic induction lines, so that the mover assembly 3 performs reciprocating linear motion in the X direction, that is, the vibration of the product, and the frequency and amplitude of the vibration of the mover assembly 3 can be changed by controlling and adjusting the current waveform of the first coil 41, so as to generate different vibration sensations, the vibration sense richness is improved, the different tactile feedback is realized, and the power source is convenient to apply to the tactile feedback of the intelligent equipment, so that better experience is provided for users, and the application range of the product is improved.

Compared with the prior art, the utility model discloses simple structure, it is compact, reduce the shared space of motor, whole volume is less, two first permanent magnets 31 and two enhancement permanent magnets 33 between them form four permanent magnet structures, two enhancement permanent magnets 33 have not only increased magnetic field intensity, the drive power of 3 vibrations of active cell subassembly has been promoted, and can reduce magnetic leakage etc., energy utilization is improved, can also guarantee that the magnetic field of two first permanent magnets 31 top is unanimous basically rather than the magnetic field of below, thereby the vibration effect of product has been improved, stability and reliability, the life of product has been prolonged, the cost is reduced, and then the application and the development of product have been enlarged. In addition, when the top in the upper case 1 is provided with damping structures such as damping copper rings or damping coils which are matched with the two first permanent magnets 31, the damping effect of the damping structures can be enhanced by the four permanent magnet structures, so that the rotor assembly 3 is better prevented from colliding with the case in vibration.

The foregoing is directed to embodiments of the present disclosure, which are provided for illustration only and not for limitation, and it is understood that modifications and substitutions may be made by those skilled in the art without departing from the spirit of the disclosure and all such modifications and substitutions are to be considered within the scope of the appended claims. In this case all the details may be replaced with equivalent elements, and the materials, shapes and dimensions may be any.

Claims (10)

1. A linear vibration motor with a four-permanent magnet structure is characterized by comprising an upper machine shell (1) and a lower machine shell (2), the upper casing (1) and the lower casing (2) are internally provided with a rotor component (3) and a stator component (4) correspondingly matched with the rotor component (3), active cell subassembly (3) are located the top of stator module (4), active cell subassembly (3) include with two first permanent magnet (31), two of the corresponding complex of stator module (4) first permanent magnet (31) are arranged, two along the X direction be provided with two along the Z direction between first permanent magnet (31) and strengthen permanent magnet (33), two first permanent magnet (31) magnetize and magnetize opposite direction, two along the Z direction strengthen permanent magnet (33) and magnetize opposite direction along the X direction.

2. A linear vibration motor having a four permanent magnet structure according to claim 1, wherein said stator assembly (4) comprises a first coil (41) correspondingly engaged with two said first permanent magnets (31) and a first FPC board (42) for connecting said first coil (31) with an external circuit, said first FPC board (42) being fixed on said lower case (2).

3. A linear vibration motor with a four permanent magnet structure according to claim 1, characterized in that the mover assembly (3) further comprises a mass (32), and two first permanent magnets (31) and two reinforcing permanent magnets (33) are provided on the mass (32).

4. A linear vibration motor having a four permanent magnet structure according to claim 3, wherein two first permanent magnets (31) are connected with two reinforcing permanent magnets (33), and a first hole (321) for accommodating the two first permanent magnets (31) is formed in the mass block (32), and the first hole (321) penetrates the mass block (32) in the Z direction.

5. A linear vibration motor with a four permanent magnet structure according to claim 4, characterized in that the top of the mass (32) is provided with a pole piece (34) cooperating with the two first permanent magnets (31), the two first permanent magnets (31) being located below the pole piece (34).

6. A linear vibration motor with a four permanent magnet structure according to claim 5, characterized in that the mass block (32) is provided with a first avoiding groove (322) for installing the pole piece (34), and the first hole body (321) is located at the bottom surface of the first avoiding groove (322).

7. The linear vibration motor with a four permanent magnet structure according to any one of claims 1 to 6, wherein both ends of the mover assembly (3) in the X direction are elastically connected to the upper case (1) by springs (5), respectively.

8. The linear vibration motor with a four permanent magnet structure according to claim 7, wherein the spring (5) is V-shaped, and both sides of the spring (5) are connected with the mover assembly (3) and the upper case (1), respectively.

9. A linear vibration motor having a four permanent magnet structure according to claim 8, wherein the joints of the springs (5) with the mover assembly (3) and the upper case (1) are respectively provided with reinforcing plates (52).

10. A linear vibration motor having a four permanent magnet structure according to claim 8, wherein the spring (5) is provided with a buffer plate (51) at an inner side of one side thereof to be engaged with the other side thereof.

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