CN212850206U

CN212850206U - Linear vibration motor

Info

Publication number: CN212850206U
Application number: CN202021343371.7U
Authority: CN
Inventors: 毛路斌; 李子昂; 崔志勇; 汤赟
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2021-03-30
Anticipated expiration: 2030-07-08
Also published as: WO2022006938A1

Abstract

The utility model provides a linear vibration motor, including the inside shell that has accommodating space and accommodate stator and the oscillator in accommodating space and suspend the oscillator in the elastic support piece in accommodating space, one of them party of oscillator and stator includes the coil pack, the other party includes the magnet steel assembly relative with the coil pack interval, the magnet steel assembly includes the magnet steel array that is located the vibration direction both sides of the relative oscillator of coil pack; the magnetic steel array comprises inner magnetic steel facing the coil assembly and outer magnetic steel arranged on two sides of the inner magnetic steel and arranged side by side with the inner magnetic steel; the magnetizing direction of the inner magnetic steel is perpendicular to the vibration direction, and the included angle a between the magnetizing direction of the outer magnetic steel and the winding plane of the coil satisfies the relation: 0 ° < a <90 °; the magnetic lines of force of the external magnetic steel positioned at two sides of the same internal magnetic steel are symmetrically arranged relative to the internal magnetic steel. The utility model discloses a linear vibration motor can improve thereby magnetic circuit flatness reduces the distortion, improves thereby the increase vibration volume of electrical coil magnetic induction intensity.

Description

Linear vibration motor

[ technical field ] A method for producing a semiconductor device

The utility model relates to a vibrating motor technical field especially relates to a linear vibrating motor.

[ background of the invention ]

A linear motor is a transmission device that directly converts electric energy into linear motion mechanical energy, and is also called a linear motor, a push rod motor, and the like. The linear motor generally comprises a vibrator and a stator, the vibrator of the linear motor generally reciprocates under the action of ampere force, and transmission mechanisms such as gears and the like are not needed for transmission. The linear motor has the advantages of simple structure, high acceleration, high precision and the like, and is widely applied to different manufacturing and processing technical fields, and along with the rapid development of the technology in each field, the requirements of each field on the motion performance of the linear motor are gradually increased.

The magnetic steel of the linear motor in the prior art is generally parallel to the thickness direction of the linear motor to be magnetized, and the magnetic steel provides a constant magnetic field for the motor through different cloth arranging modes. Therefore, the existing linear motor has a limited magnetic flux generated by the magnetic steel in a limited size space, so that the vibration amount of the linear motor is also limited, and the distortion of the linear motor caused by the large change of the magnetic field gradient is also large.

Therefore, it is necessary to provide a linear vibration motor to improve the above problems.

[ Utility model ] content

An object of the utility model is to provide a thereby magnetize through the slant and reduce the distortion and improve the linear vibrating motor of electrical coil magnetic induction intensity improvement vibration volume.

The technical scheme of the utility model as follows: the linear vibration motor comprises a shell with an accommodating space inside, a stator and a vibrator accommodated in the accommodating space, and an elastic support part for suspending the vibrator in the accommodating space, wherein one of the vibrator and the stator comprises a coil assembly, the other of the vibrator and the stator comprises a magnetic steel assembly opposite to the coil assembly at intervals, the coil assembly comprises an iron core and coils wound on the periphery of the iron core, and the magnetic steel assembly comprises magnetic steel arrays positioned on two sides of the coil assembly opposite to the vibration direction of the vibrator; the magnetic steel array comprises inner magnetic steel facing the coil assembly and outer magnetic steel arranged on two sides of the inner magnetic steel and arranged side by side with the inner magnetic steel; the magnetizing direction of the inner magnetic steel is perpendicular to the vibration direction, the magnetic poles of the inner magnetic steel and the adjacent outer magnetic steel close to the coil assembly are opposite, the included angle between the magnetizing direction of the outer magnetic steel and the winding plane of the coil is a, and the included angle a meets the relation: 0 ° < a <90 °; the magnetic lines of force of the external magnetic steel positioned on two sides of the same internal magnetic steel are symmetrically arranged relative to the internal magnetic steel.

Preferably, the magnetic steel assembly further comprises a coil assembly located at two ends of the vibration direction and opposite to and spaced from the coil assembly, and magnetic poles of the side magnetic steels at different sides are arranged in a homopolar and opposite mode.

Preferably, the internal magnetic steel comprises a first internal magnetic steel and a second internal magnetic steel which are symmetrically arranged relative to the coil assembly, and the first internal magnetic steel and the second internal magnetic steel are oppositely arranged close to the same poles of the coil assembly.

Preferably, the external magnetic steel ladles are positioned on first external magnetic steel on two sides of the first internal magnetic steel and second external magnetic steel on two sides of the second internal magnetic steel, and the magnetic poles of the first external magnetic steel and the opposite magnetic poles of the second external magnetic steel are opposite.

Preferably, the side magnetic steels are symmetrically arranged relative to the coil assembly.

Preferably, the coil assembly further includes pole shoes fixed to both ends of the core in the vibration direction, and the coil is located between the pole shoes.

More preferably, the orthographic projection of the external magnetic steel on the coil along the direction perpendicular to the vibration direction is at least partially non-overlapped with the coil.

Preferably, the coil assembly is the stator, and the coil assembly is fixedly connected with the shell; the oscillator further comprises a mass block for supporting and fixing the magnetic steel assembly, one end of the elastic supporting piece is fixed to the mass block, the other end of the elastic supporting piece is fixed to the shell, the mass block penetrates through the through hole, the magnetic steel assembly is contained in the through hole and fixed to the mass block, and at least part of the coil assembly extends into the through hole and is arranged at intervals with the magnetic steel assembly.

Preferably, the elastic support comprises an elastic arm, and a first connecting arm and a second connecting arm which are respectively connected with two opposite ends of the elastic arm; the quality piece includes relative and the interval first side that sets up and connects the second side between the first side, first side with second side end to end encloses into the through-hole, first linking arm with the second side is fixed continuous, the second linking arm with the shell is fixed continuous.

Preferably, the oscillator further comprises a magnetic conductive sheet clamped between the mass block and the magnetic steel, one side of the magnetic conductive sheet connected with the magnetic steel assembly is provided with a glue containing groove, and the magnetic conductive sheet is fixed with the magnetic steel assembly through gluing.

Preferably, a damping member is disposed between the elastic arm and the first side.

Preferably, the housing includes a base plate fixedly connected to the stator and a cover body cooperatively connected to the base plate.

Preferably, the linear vibration motor further comprises a limiting block fixed to the bottom plate, and the limiting block is arranged between the mass block and the cover body along the vibration direction.

The beneficial effects of the utility model reside in that: the utility model discloses an outer magnet magnetize the direction with the contained angle on winding plane is a, contained angle a satisfies the relational expression: 0 < a <90 °, namely the external magnetic steel is obliquely magnetized, and the obliquely magnetized external magnetic steel can improve the flatness of a magnetic induction coefficient curve BL (x) of the whole magnetic circuit of the magnetic steel assembly, thereby reducing the distortion of the linear vibration motor, and simultaneously, the obliquely magnetized external magnetic steel can also improve the magnetic induction intensity of the electrified coil, thereby improving the vibration quantity of the linear vibration motor.

[ description of the drawings ]

Fig. 1 is a schematic perspective view of a linear vibration motor according to an embodiment of the present invention;

fig. 2 is an exploded view of a linear vibration motor according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 4 is a block diagram of a coil assembly and a base plate according to an embodiment of the present invention;

fig. 5 is an internal structure view of a linear vibration motor according to an embodiment of the present invention;

fig. 6 is a schematic view of the magnetic circuit principle of the linear vibration motor of the present invention;

fig. 7 is an electromagnetic induction schematic diagram of the linear vibration motor according to the present invention when a forward current is applied;

fig. 8 is an electromagnetic induction schematic diagram of the linear vibration motor according to the present invention when negative current is applied.

[ detailed description ] embodiments

The present invention will be further described with reference to the accompanying drawings and embodiments.

The utility model provides a linear vibration motor. As shown in fig. 1 to 5, the linear vibration motor 100 includes a housing 1, a stator 2, a vibrator 3, an elastic support member 4, a pad 5, a stopper 6, a damping member 7, and a flexible circuit board 8.

As shown in fig. 1-3, the stator 2, the vibrator 3, the elastic support member 4, the soldering lug 5, the limiting block 6 and the damping member 7 are all installed in the accommodating space 13 of the housing 1. The stator 2 is fixed on the housing 1, and the vibrator 3 is fixed on the housing 1 through two elastic supporting pieces 4 and then suspended in the accommodating space 13 of the housing 1. The elastic supporting piece 4 and the shell 1 and the vibrator 3 are welded through the welding pieces 5, and the vibrator 3 can reciprocate relative to the stator 2 along the vibration direction of the vibrator.

Specifically, as shown in fig. 1 to 3, the housing 1 includes a bottom plate 11, a cover 12, and a housing space 13. As shown in fig. 2-3, the bottom plate 11 includes a fixing plate 111 and a lower cover plate 112, the fixing plate 111 is fixed on one side of the lower cover plate 112 close to the cover 12 and is connected to the cover 12, and the pole piece 23 and the circuit board 8 are fixed on the fixing plate 111.

Further, as shown in fig. 1 to 3, the cover 12 includes a top cover 121, a first side plate 122, a second side plate 123, and two oppositely disposed third side plates 124, the top cover 121 is opposite to the bottom plate 11, the first side plate 122 is opposite to the second side plate 123, and the first side plate 122, the second side plate 123, and the two third side plates 124 connect the top cover 121 and the bottom plate 11 to form the accommodating space 13 of the enclosure 1. As shown in fig. 1-2, a first groove 1221 is formed on one side of the first side plate 122 close to the bottom plate 11, and the first groove 1221 is provided for the circuit board 8 to penetrate through and extend out of the housing 1. In this embodiment, as shown in fig. 1 to 3, a first groove 1221 is also formed on one side of the second side plate 123 close to the bottom plate 11, and the second side plate 123 is centrosymmetric with the first side plate 122 relative to the stator 2. In this embodiment, the first side plate 122, the second side plate 123, and the two third side plates 124 are integrally formed with the top cover 121 to form the cover 12.

Specifically, as shown in fig. 2-4, in this embodiment, the stator 2 is a coil assembly 20 and is fixedly connected to the housing 1, and the coil assembly at least partially extends into the through hole 311 and is spaced from the magnetic steel assembly 32. The coil assembly 20 includes a core 21, a coil 22, and a pole piece 23. The coil 22 is wound around the outer periphery of the core 21 to form a winding plane P, as shown in fig. 6, and in the present embodiment, the vibration direction of the vibrator is the X direction as shown in fig. 6.

Further, the pole piece 23 includes a first pole piece 231 and a second pole piece 232, the first pole piece 231 and the second pole piece 232 are respectively welded and fixed to two ends of the iron core 21 along the vibrator vibration direction, the coil 22 is located between the first pole piece 231 and the second pole piece 232, and the bottom of the pole piece 23 is welded to the fixing plate 111 of the bottom plate 11, so that the entire coil assembly 20 is fixed to the bottom plate 11. By providing pole pieces 23 at both ends of core 21, pole pieces 23 induce N and S poles when coil 22 is energized, as shown in fig. 7-8. According to the same poles repelling each other and the opposite poles attracting each other, electromagnetic force is generated between the coil assembly 20 and the first side magnetic steel 3211 and the second side magnetic steel 3212.

Further, in the present embodiment, the iron core 21 and the pole shoe 23 are made of SPCD material according to japanese industrial standard.

Specifically, as shown in fig. 2, the vibrator 3 includes a mass 31, a magnetic steel assembly 32, and four magnetic conductive sheets 33.

Further, as shown in fig. 2, the mass 31 is used for supporting and fixing the magnetic steel assembly 32, the mass 31 includes a through hole 311, a pair of first sides 312, a pair of second sides 313 and a second groove 314, in this embodiment, the through hole 311 is opened through a central area of the mass. The two first sides 312 are oppositely arranged at intervals, the two second sides 313 are respectively connected between the two first sides, the first sides 312 and the second sides 313 are connected end to form the through hole 311, and the second groove 314 is arranged on the first sides 312 and comprises two parts oppositely arranged along the vibration direction of the vibrator, as shown in fig. 2-3. In this embodiment, the through hole 311 is rectangular, a pair of first sides 312 is close to the elastic arm 41 and spaced apart from the elastic arm by a certain distance, and a pair of second sides 313 connects the ends of the pair of first sides 312. The first connecting arm 42 is fixedly connected at its end to the second side 313 of the mass 31 and the second connecting arm 43 is fixedly connected at its end to the housing 1.

Further, as shown in fig. 1-3 in conjunction with fig. 5, the mass 31 is suspended within the housing 1 around the stator 2. The mass 31 and the first connecting arm 42 of the elastic supporting member 4 are welded together by the first welding plate 51, and the second connecting arm 43 of the elastic supporting member 4 is welded to the third side plate 124 by the second welding plate 52 so as to suspend the mass 31 within the housing 1. Furthermore, as shown in fig. 2 to 3, two second sides 313 are symmetrical with respect to the center of the coil assembly 20, the second sides 313 and the first connecting arms 42 of the elastic supporting members 4 are fixedly connected by the first soldering tabs 51, and the second recess 314 is opened at one side of the first side 312 close to the elastic arm 41 for filling a part of the damping member 7. In this embodiment, the damping member 7 is specifically foam.

Specifically, as shown in fig. 2-3 in combination with fig. 5, the magnetic steel assembly 32 is received in the through hole 311 and fixed to the mass 31. The magnetic steel assembly 32 is accommodated in the through hole 311, and includes eight magnetic steels respectively spaced from the coil assembly 20, and the magnetic steel assembly 32 includes a side magnetic steel 321 and a magnetic steel array 322.

Specifically, the side magnet steel 321 is located the coil assembly 20 is along the both ends of oscillator vibration direction and with the coil assembly 20 is relative and the interval sets up, and side magnet steel 321 includes first side magnet steel 3211 and second side magnet steel 3212. The first side magnetic steel 3211 and the second side magnetic steel 3212 are respectively disposed on two sides of the winding plane P of the coil assembly 20 and are opposite to the pole shoes 23 at two ends of the coil assembly along the vibration direction at an interval. The like poles of the first side magnetic steel 3211 and the second side magnetic steel 3212 are opposite. The first side magnetic steel 3211 and the second side magnetic steel 3212 are symmetrically disposed with respect to the coil assembly 20, and are magnetized in a vibration direction, and the magnetizing directions of the two are opposite.

Specifically, the magnetic steel array 322 is located on two sides of the coil assembly 20 opposite to the vibration direction of the vibrator and symmetrically arranged relative to the coil assembly 20. The magnetic steel array 322 includes an inner magnetic steel 3221 facing the coil assembly 20 and an outer magnetic steel 3222 disposed at two sides of the inner magnetic steel 3221 and arranged side by side with the inner magnetic steel 3221. Wherein the projection of the external magnetic steel 3222 on the coil 22 along the vibration direction perpendicular to the vibrator does not overlap at least partially with the coil. The internal magnetic steel 3221 includes a first internal magnetic steel 32211 and a second internal magnetic steel 32212, the first internal magnetic steel 32211 and the second internal magnetic steel 32212 are symmetrically arranged with respect to the coil assembly 20, and the first internal magnetic steel 32211 and the second internal magnetic steel 32212 are arranged with their magnetic poles in the vicinity of the coil assembly 20. The magnetizing directions of the first internal magnetic steel 32211 and the second internal magnetic steel 32212 are perpendicular to the vibration direction of the vibrator and opposite to each other. Both the first inner magnetic steel 32211 and the second inner magnetic steel 32212 have like poles near the coil assembly 20, and both the inner magnetic steel 3221 and its adjacent outer magnetic steel 3222 have opposite poles near the coil assembly 20. In this embodiment, the magnetic pole of the inner magnetic steel 3221 near the coil assembly 20 is an S pole, and the magnetic pole of the outer magnetic steel 3222 near the coil assembly 20 is an N pole, as shown in fig. 6.

As shown in fig. 2 and fig. 5, the external magnetic steel 3222 includes two first external magnetic steels 32221 and two second external magnetic steels 32222, the two first external magnetic steels 32221 are located on two sides of the first internal magnetic steel 32211 and are arranged side by side with the first internal magnetic steel 32211 along the vibration direction of the transducer, the two second external magnetic steels 32222 are located on two sides of the second internal magnetic steel 32212 and are arranged side by side with the second internal magnetic steel 32212 along the vibration direction of the transducer, and the first external magnetic steel 32221 is arranged opposite to the opposite side of the same magnetic pole of the second external magnetic steel 32222. Wherein, the angle between the magnetizing direction of the external magnetic steel 3222 and the winding plane is a, and the angle a satisfies the relation: 0 ° < a <90 °. The two first external magnetic steels 32221 are arranged side by side with the first internal magnetic steel 32211 along the vibration direction of the vibrator and are symmetrical with respect to the first internal magnetic steel 32211, and the two second external magnetic steels 32222 are arranged side by side with the second internal magnetic steel 32212 along the vibration direction of the vibrator and are symmetrical with respect to the second internal magnetic steel 32212, that is, magnetic lines of force of the two external magnetic steels 3222 located at two sides of the same internal magnetic steel 3221 are symmetrical with respect to the internal magnetic steel 3221. In this embodiment, magnetic steel assembly 32 provides the magnetic field, and the mode that the combination adopted the slant to magnetize (magnetization direction and vibration direction nonparallel are also not perpendicular) to the magnet steel of particular position provides the linear vibrating motor of the novel magnetic circuit that has the slant to magnetize, the utility model provides a linear vibrating motor is for current motor structure, and the slant outer magnet that magnetizes can improve the flatness of the line coefficient curve of induction BL (x) of the whole magnetic circuit of magnetic steel assembly, thereby reduces the utility model discloses linear vibrating motor's distortion, simultaneously, the slant outer magnet that magnetizes can also improve the magnetic induction intensity of circular telegram coil to improve linear vibrating motor's vibration volume.

As shown in fig. 2-3 and fig. 5, the magnetic conductive plates 33 are sandwiched between the mass block 31 and the magnetic steel assembly 32, the four magnetic conductive plates 33 are respectively welded on the inner wall 3111 of the rectangular through hole 311 of the mass block 31, one side of the magnetic conductive plate 33 away from the mass block 31 is fixed to the magnetic steel assembly 32 by gluing, and the magnetic conductive plate 33 includes two first magnetic conductive plates 331 arranged oppositely and two second magnetic conductive plates 332 arranged oppositely. The first magnetic conductive sheet 331 is opposite to the side magnetic steel 321, the second magnetic conductive sheet 332 is opposite to the magnetic steel array 322, the four magnetic conductive sheets 33 enclose a rectangular frame, and the four magnetic conductive sheets 33 are made of SPCD materials of Japanese industrial standards and can play roles of magnetic shielding and magnetic gathering.

Furthermore, as shown in fig. 2, the side of the four magnetic conductive plates 33 connected to the magnetic steel assembly 32 is provided with a glue containing slot 333, and the magnetic conductive plates 33 and the magnetic steel assembly 32 are fixed by gluing. The glue containing groove 333 can increase the reliability of gluing between the magnetic steel assembly 32 and the magnetic conductive sheet 33, and prevent the risk of glue overflow.

Furthermore, in this embodiment, the position of the angle a between the magnetizing direction of the external magnetic steel 3222 and the winding plane P is shown in fig. 6.

Specifically, as shown in fig. 1-2 in conjunction with fig. 5, in the present embodiment, the elastic support members 4 are two in number. The elastic support 4 includes an elastic arm 41, a first connecting arm 42 and a second connecting arm 43. The first connecting arm 42 and the second connecting arm 43 are respectively connected with two opposite ends of the elastic arm and are formed by bending and extending two ends of the elastic arm 41 along the vibration direction of the vibrator 3. The two elastic supporting members 4 are arranged in central symmetry with respect to the coil assembly 20, and one end of each elastic supporting member is fixed to the mass block 31, and the other end of each elastic supporting member is fixed to the housing 1. Elastic arm 41 is suspended above limiting block 6, first connecting arm 42 and second connecting arm 43 extend in the same direction in a bending manner, first connecting arm 42 and mass block 31 are welded together through first soldering lug 51, second connecting arm 43 welds elastic support 4 on third side plate 124 through second soldering lug 52, and then mass block 31 is suspended in housing 1, that is, elastic support 4 connects vibrator 3 and housing 1 through soldering lug 5 and provides supporting force and restoring force for vibrator 3.

Specifically, as shown in fig. 1-2, the linear vibration motor 100 further includes a soldering lug 5, two first soldering lugs 51 and two second soldering lugs 52, the first soldering lugs 51 are used for welding and fixing the first connecting arms 42 of the elastic supporting members 4 on the same side to the second side edge 313 of the mass block 31, and the second soldering lugs 52 are used for welding and fixing the second connecting arms 43 of the elastic supporting members 4 on the same side to the housing 1.

Specifically, as shown in fig. 2 to 4, the linear vibration motor 100 further includes two stoppers 6, and the two stoppers 6 are respectively located between the mass block 31 and the first side plate 122 and between the mass block 31 and the second side plate 123 along the vibration direction and are welded and fixed to the fixing plate 111 of the base plate 11. In this embodiment, the two limit blocks 6 are located below the elastic arm 41 of the elastic support 4, and are respectively close to the first side plate 122 and the second side plate 123, and are far away from the mass block 31. The limiting block 6 can prevent the vibrator 3 from colliding with the shell 1.

Specifically, as shown in fig. 2 to 3 and 5, the linear vibration motor 100 further includes a damping member 7, in this embodiment, the damping member 7 is specifically foam, and the foam is fixed between the elastic arm 41 of the elastic support member 4 and the first side 312 of the mass 31. In this embodiment, two second grooves 314 symmetrical to the coil assembly 20 are further formed on the side, close to the elastic arm 41, of the first side 312 of the mass 31, a part of the damping element 7 is filled in the second grooves 314, and the other part of the damping element is filled between the elastic arm 41 and the first side 312 of the mass 31, so as to play a role in protecting and increasing mechanical damping in the vibration process of the vibrator 3.

Specifically, the circuit board 8 is attached to the fixing plate 111, and has one end electrically connected to the coil 22 and the other end extending out of the housing 1 through the first recess 1221, as shown in fig. 1-3.

The working principle is as follows: as shown in fig. 6, the vibration direction of the vibrator 3 is along the X direction, which includes an X positive direction in which an arrow is directed and an X negative direction opposite to the X positive direction. The magnetizing directions of the magnetic steel assembly 32 are shown by arrows in fig. 6, and the included angles a (0 ° < a <90 °) between the magnetizing directions of the four external magnetic steels and the winding plane P are shown in fig. 8.

Specifically, as shown in fig. 2 and fig. 6, the magnetic steel assemblies 32 are arranged according to the arrangement shown in fig. 6, and can generate a constant magnetic field, wherein magnetic lines of force point to S poles from N poles, and the directions of the magnetic lines of force are shown in fig. 7-8. As shown in fig. 2-4 in combination with fig. 6, the energized coil 22 generates an ampere force along the vibration direction according to the left-hand rule under the action of the constant magnetic field, and meanwhile, when the coil 22 is fed with an alternating current with a certain frequency, the pole shoe 23 respectively induces an N pole and an S pole according to the direction of the fed current, and the polarity induced by the pole shoe 23 changes along with the change of the current direction, and at this time, the first side magnetic steel 3211 and the second side magnetic steel 3212 opposite to the pole shoe 23 are also generated electromagnetic force on the stator according to the repulsion and opposite attraction of the same poles. The resultant force obtained by superposition of electromagnetic force and ampere force applied to the stator 2 is F1, according to the acting force and the reacting force, the force applied to the vibrator 3 is F2 of F1, and the forces F2 and F1 required by movement of the vibrator 3 are the acting force and the reacting force, so that F1 and F2 are equal in size and opposite in direction, namely F1+ F2 is equal to 0.

(1) The direction of the magnetic force line of the constant magnetic field is shown in fig. 7, with reference to fig. 6, when the coil 22 of the stator 2 is energized with a forward current, it is determined according to the right-hand rule that the first pole shoe 231 induces an N pole and the second pole shoe 232 induces an S pole, and according to the same-polarity attraction and opposite-polarity repulsion and the magnetizing directions of the first side magnetic steel 3211 and the second side magnetic steel 3212, the magnetizing directions are shown in fig. 6, and an electromagnetic force along the X forward direction is generated under the action of an external constant magnetic field. At the same time, according to the left-hand rule, the energized coil 22 generates an ampere force in the positive X direction under the action of the constant magnetic field. The electromagnetic force and the ampere force are superposed to generate a thrust F1 along the positive direction X, and according to the acting force and the reacting force, the vibrator 3 generates a thrust F2 along the negative direction X, so that the vibrator 3 vibrates towards the negative direction X.

(2) As shown in fig. 8, with reference to fig. 6, when the coil 22 of the stator 2 is supplied with a negative current, it is determined according to the right-hand rule that the first pole piece 231 induces an S pole and the second pole piece 232 induces an N pole, and an electromagnetic force along the negative X direction is generated under the action of an external constant magnetic field according to the magnetization direction and the principle that like poles attract and repel each other of the

magnetic steel assemblies

3211 and 3212 shown in fig. 6. Meanwhile, according to the left-hand rule, the energized coil 22 generates an ampere force in the negative X direction under the action of a constant magnetic field. The electromagnetic force and the ampere force are superposed to generate a thrust F1 in the negative X direction, and the vibrator 3 vibrates in the positive X direction by generating a thrust F2 in the positive X direction according to the acting force and the reaction force.

In summary, when an alternating current with a certain frequency is applied to the coil 22, the vibrator 3 will alternately generate positive thrust and negative thrust along X direction, so that the vibrator 3 vibrates back and forth along X direction. Magnet steel assembly adopts specific mode of arranging to be used for providing the magnetic field, combines to adopt the mode that the slant magnetizes to the magnet steel of particular position to provide a linear vibration motor who has the novel magnetic circuit that the slant magnetizes, the utility model provides a linear vibration motor is for current motor structure, and the vibration thrust that receives is electromagnetic force and the resultant force that produces with the equidirectional ampere force combined action of electromagnetic force, and magnetizes the outer magnet steel slant of particular position and can improve the flatness of the line coefficient curve of induction BL (x) of the whole magnetic circuit of magnet steel assembly, thereby reduces the utility model discloses linear vibration motor's distortion, simultaneously, the slant magnetizes outer magnet steel still can improve the magnetic induction intensity of electrified coil to improve linear vibration motor's vibration volume.

The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.

Claims

1. A linear vibration motor comprises a shell with an accommodating space inside, a stator and a vibrator accommodated in the accommodating space, and an elastic support part for suspending the vibrator in the accommodating space, wherein one of the vibrator and the stator comprises a coil assembly, the other of the vibrator and the stator comprises a magnetic steel assembly opposite to the coil assembly at intervals, the coil assembly comprises an iron core and a coil wound on the periphery of the iron core, and the magnetic steel assembly is characterized by comprising magnetic steel arrays positioned on two sides of the coil assembly opposite to the vibration direction of the vibrator; the magnetic steel array comprises inner magnetic steel facing the coil assembly and outer magnetic steel arranged on two sides of the inner magnetic steel and arranged side by side with the inner magnetic steel; the magnetizing direction of the inner magnetic steel is perpendicular to the vibration direction, the magnetic poles of the inner magnetic steel and the adjacent outer magnetic steel close to the coil assembly are opposite, the included angle between the magnetizing direction of the outer magnetic steel and the winding plane of the coil is a, and the included angle a meets the relation: 0 ° < a <90 °; the magnetic lines of force of the external magnetic steel positioned on two sides of the same internal magnetic steel are symmetrically arranged relative to the internal magnetic steel.

2. The linear vibration motor of claim 1, wherein the magnetic steel assembly further includes side magnetic steels located at two ends of the coil assembly along the vibration direction and opposite to and spaced from the coil assembly, and magnetic poles of the side magnetic steels located at different sides are arranged in opposite polarities.

3. A linear vibration motor as claimed in claim 1, wherein said internal magnetic steel includes a first internal magnetic steel and a second internal magnetic steel symmetrically disposed with respect to said coil block, both of said first internal magnetic steel and said second internal magnetic steel being disposed in homopolar opposition adjacent to a magnetic pole of said coil block.

4. The linear vibration motor of claim 3, wherein the outer magnetic steel is positioned on a first outer magnetic steel on both sides of the first inner magnetic steel and on a second outer magnetic steel on both sides of the second inner magnetic steel, and the first outer magnetic steel is arranged opposite to the opposite second outer magnetic steel in the same pole.

5. A linear vibration motor according to claim 2, wherein said side magnetic steels are symmetrically disposed with respect to said coil block.

6. A linear vibration motor according to claim 1, wherein said coil assembly further comprises pole pieces fixed to both ends of said iron core in said vibration direction, said coil being located between said pole pieces.

7. A linear vibration motor according to claim 1, wherein an orthogonal projection of said external magnet on said coil in a direction perpendicular to said vibration direction is at least partially non-overlapping with said coil.

8. A linear vibration motor as claimed in claim 1, wherein said coil block is said stator, said coil block being fixedly connected to said housing; the oscillator further comprises a mass block for supporting and fixing the magnetic steel assembly, one end of the elastic supporting piece is fixed to the mass block, the other end of the elastic supporting piece is fixed to the shell, the mass block penetrates through the through hole, the magnetic steel assembly is contained in the through hole and fixed to the mass block, and at least part of the coil assembly extends into the through hole and is arranged at intervals with the magnetic steel assembly.

9. The linear vibration motor of claim 8, wherein the elastic support member includes an elastic arm and first and second connection arms connected to opposite ends of the elastic arm, respectively; the quality piece includes relative and the interval first side that sets up and connects the second side between the first side, first side with second side end to end encloses into the through-hole, first linking arm with the second side is fixed continuous, the second linking arm with the shell is fixed continuous.

10. The linear vibration motor of claim 8, wherein the vibrator further includes a magnetic conductive plate sandwiched between the mass block and the magnetic steel, a glue accommodating groove is provided on a side of the magnetic conductive plate connected to the magnetic steel assembly, and the magnetic conductive plate is fixed to the magnetic steel assembly by gluing.

11. The linear vibration motor of claim 9, wherein a damping member is provided between the elastic arm and the first side.

12. The linear vibration motor of claim 8, wherein the housing includes a base plate fixedly coupled to the stator and a cover body coupled to the base plate.

13. The linear vibration motor of claim 12, further comprising a stopper fixed to the base plate, the stopper being disposed between the mass and the cover in the vibration direction.