Linear vibration motor

Abstract

The invention provides a linear vibration motor which comprises a shell, a rotor, a stator and an elastic part, the rotor and the stator are accommodated in the shell at an interval, the elastic part is used for elastically suspending the rotor in the shell, and the stator is fixed in the shell and used for driving the rotor to vibrate; the rotor comprises two groups of magnetic steels which are arranged in parallel at intervals; the stator comprises a coil which is arranged between the two groups of magnetic steel and is spaced from the two groups of magnetic steel in the first direction, the winding plane of the coil is parallel to the vibration direction of the rotor, and the two opposite ends of the coil in the second direction are fixed to the two opposite sides of the shell respectively; the first direction, the second direction and the vibration direction of the rotor are perpendicular to each other. According to the linear vibration motor, the magnetic lines of force can be completely closed through the design of the double magnetic steels, so that the driving efficiency of the stator for driving the rotor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration, and particularly to a linear vibration motor. Background Art

[0002] A linear vibration motor is a machine that converts other forms of energy into mechanical vibration, mainly providing vibration for devices that require vibration, such as mobile phones, tablets, game consoles, etc.

[0003] A linear vibration motor mainly includes a housing, a mover, a stator, an elastic member that elastically suspends the mover in the housing, and a flexible circuit board with a control system, etc., and the stator is used to drive the mover to vibrate.

[0004] In a linear vibration motor, the mover is mainly one of a permanent magnet and a coil, and the stator is the other of the permanent magnet and the coil. No matter how it is selected, the related art always selects a permanent magnet or a plurality of permanently magnets stacked in sequence, and at the same time, the coil is disposed opposite to one outer side surface of the permanent magnet. Although this design method can achieve the vibration effect of the linear vibration motor, it will reduce the driving efficiency of the stator for driving the mover and cannot meet the requirements of devices with high driving efficiency.

[0005] Therefore, it is necessary to provide a new linear vibration motor to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a new linear vibration motor to solve the problem of low driving efficiency of the linear vibration motor in the related art.

[0007] The present invention provides a linear vibration motor, which includes a housing, a mover and a stator that are spaced and received in the housing, and an elastic member that elastically suspends the mover in the housing, and the stator is fixed to the housing and used to drive the mover to vibrate;

[0008] The mover includes two groups of permanent magnets that are spaced apart and arranged in parallel; the stator includes a coil that is disposed between the two groups of permanent magnets and spaced from the two groups of permanent magnets in a first direction, the winding plane of the coil is parallel to the vibration direction of the mover, and the opposite ends of the coil in a second direction are respectively fixed to the opposite sides of the housing, and the first direction, the second direction and the vibration direction of the mover are perpendicular to each other pairwise.

[0009] Preferably, each group of the permanent magnets includes a three-segment magnetized permanent magnet, and the magnetization directions of the three-segment magnetized permanent magnet form a Halbach array; or each group of the permanent magnets includes three sub-permanent magnets that are stacked in sequence along the vibration direction of the mover, and the three sub-permanent magnets form a Halbach array.

[0010] Preferably, the linear vibration motor further includes a flexible circuit board fixed inside the housing and extending outside the housing, and the coil is electrically connected to the flexible circuit board; there are two elastic members, which are spaced apart along the vibration direction of the mover and are respectively disposed on opposite sides of the mover, and the two elastic members are respectively fixed on opposite sides of the housing and jointly suspend the mover elastically inside the housing.

[0011] Preferably, the mover further includes pole cores stacked and fixed on one side of each set of magnetic steel away from the other set of magnetic steel.

[0012] Preferably, the mover further includes a mass block; the mass block has a through hole penetrating along the second direction, the magnetic steel and the pole core are both fixed inside the through hole, and the magnetic steel is fixed to the mass block through the pole core; the elastic member is connected between the mass block and the housing.

[0013] Preferably, the linear vibration motor further includes an elastic shock absorber connecting the housing and the mass block.

[0014] Preferably, the mass block is rectangular; there are two elastic shock absorbers and they are spaced apart from each other, and the two elastic shock absorbers are respectively located at one set of diagonal positions of the mass block.

[0015] Preferably, the housing includes a bottom plate and an upper cover covering the bottom plate and jointly enclosing a receiving space with the bottom plate; the mover, the stator and the elastic member are all received in the receiving space, opposite ends of the coil along the second direction are respectively fixed to the bottom plate and the side of the upper cover facing the bottom plate, and the flexible circuit board is fixed to the bottom plate and extends outside the receiving space through the upper cover.

[0016] Preferably, each elastic member includes a first fixed arm fixed to the housing, a second fixed arm fixed to the mass block, and an elastic arm bent and extended from the first fixed arm towards the second fixed arm and fixedly connected to the second fixed arm.

[0017] Preferably, opposite ends of the coil along the second direction are respectively fixed to the housing by glue or bonding blocks.

[0018] Compared with the related art, in the linear vibration motor of the present invention, the mover is designed as two sets of magnetic steel spaced apart and arranged in parallel, the stator is designed as a coil located between the two sets of magnetic steel, the winding plane of the coil is parallel to the vibration direction of the mover, and at the same time, opposite ends of the coil along the second direction are respectively fixed to opposite sides of the housing, so that the magnetic force lines can be completely closed through the design of the double magnetic steel, thereby improving the driving efficiency of the stator for driving the mover. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings, where:

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the linear vibration motor provided by the embodiment of the present invention;

[0021] Figure 2 It is a partial structural exploded schematic diagram of the linear vibration motor provided by the embodiment of the present invention;

[0022] Figure 3 Along Figure 1 The sectional view along line A-A in;

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the linear vibration motor after removing the upper cover provided by the embodiment of the present invention;

[0024] Figure 5 It is a polarity schematic diagram of another magnetic steel structure in the linear vibration motor provided by the embodiment of the present invention.

[0025] Among them, 100, linear vibration motor; 1, housing; 11, bottom plate; 12, upper cover; 13, accommodation space; 2, mover; 21, magnet; 211, sub-magnet; 22, pole core; 23, mass block; 231, through hole; 3, stator; 4, elastic member; 41, first fixed arm; 42, second fixed arm; 43, elastic arm; 5, flexible circuit board; 6, elastic shock absorber. Specific Embodiments

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0027] The embodiment of the present invention provides a linear vibration motor 100. As shown in combination with Figures 1 to 4 shown, it includes a housing 1, a mover 2 and a stator 3 that are spaced apart and housed in the housing 1, an elastic member 4 that elastically suspends the mover 2 in the housing 1, and a flexible circuit board 5 that is fixed in the housing 1 and extends outside the housing 1.

[0028] Among them, the stator 3 is used to drive the mover 2 to vibrate; the mover 2 includes two sets of magnets 21 that are spaced apart from each other and arranged in parallel; the stator 3 includes coils that are arranged between the two sets of magnets 21 at intervals and spaced from the two sets of magnets 21 in the first direction. The winding plane of the coils is parallel to the vibration direction of the mover 2. The opposite ends of the coils in the second direction are respectively fixed to the opposite sides of the housing 1. The first direction, the second direction, and the vibration direction of the mover 2 are perpendicular to each other pairwise. The vibration direction of the mover 2 is Figure 1 the X-axis direction in Figure 1 the Y-axis direction in Figure 1 the Z-axis direction in; the coils are electrically connected to the flexible circuit board 5. There are two elastic members 4, which are spaced apart from each other along the vibration direction of the mover 2 and are respectively located on the opposite sides of the mover 2. The two elastic members 4 are respectively fixed to the opposite sides of the housing 1 and jointly suspend the mover elastically in the housing 1.

[0029] In this embodiment, the housing 1 is rectangular; the housing 1 includes a bottom plate 11 and an upper cover 12 that covers the bottom plate 11 and jointly encloses a receiving space 13 with the bottom plate 11; the mover 2, the stator 3, and the elastic member 4 are all received in the receiving space 13. The opposite ends of the coils in the second direction are respectively fixed to the bottom plate 11 and the side of the upper cover 12 facing the bottom plate 11. The two elastic members 4 are respectively fixed to the opposite sides of the upper cover 12. The flexible circuit board 5 is fixed to the bottom plate 11 and extends out of the receiving space 13 through the upper cover 12. Such a design can disassemble and assemble the linear vibration motor 100 for easy later maintenance.

[0030] The mover 2 further includes pole cores 22 that are stacked and fixed on one side of each set of magnets 21 away from the other set of magnets 21. Such a design can enhance the magnetism of the mover 2, so that the driving efficiency of the coils for driving the mover 2 is better.

[0031] The mover 2 further includes a mass block 23; the mass block 23 has a through hole 231 that penetrates in the second direction. The magnets 21 and the pole cores 22 are both fixed in the through hole 231, and the magnets 21 are fixed to the mass block 23 through the pole cores 22; the two pole cores 22 are respectively fixed to the opposite inner side surfaces of the mass block 23, and the two elastic members 4 are respectively fixed to the opposite outer side surfaces of the mass block 23, that is, the elastic members 4 are connected between the mass block 23 and the housing 1. Such a design can increase the weight of the mover 2, so that the vibration effect of the mover 2 is better.

[0032] The linear vibration motor 100 further includes an elastic shock absorber 6 that connects the housing 1 and the mass block 23; in this embodiment, the mass block 23 is rectangular; there are two elastic shock absorbers 6 and they are spaced apart from each other. The two elastic shock absorbers 6 are respectively located at one set of diagonal positions of the mass block 23. Such a design can prevent the mover 2 from directly hitting the housing 1 during vibration, thereby avoiding the situation that the linear vibration motor 100 is easily damaged.

[0033] The elastic shock absorber 6 can be selected from one of elastic silica gel, foam, elastic sheet or spring.

[0034] The opposite ends of the coil in the second direction are respectively fixed to the housing 1 through glue or bonding blocks. Such a design can better fix the coil to the housing 1.

[0035] In this embodiment, each elastic member 4 includes a first fixed arm 41 fixed to the housing 1, a second fixed arm 42 fixed to the mass block 23, and an elastic arm 43 that bends and extends from the first fixed arm 41 towards the second fixed arm 42 and forms a fixed connection with the second fixed arm 42. Such a design can make the elastic member 4 have better elasticity.

[0036] In this embodiment, each group of permanent magnets 21 includes a permanently magnetized magnet with three-stage magnetization, and the magnetization directions of the permanently magnetized magnet with three-stage magnetization form a Halbach array.

[0037] As another alternative structure of each group of permanent magnets 21, as Figure 5 shown, each group of permanent magnets 21 includes three sub-permanent magnets 211 stacked in sequence along the vibration direction of the mover 2, and the three sub-permanent magnets 211 form a Halbach array. It is equivalent to that the permanent magnet 21 can use an integrally magnetized permanent magnet structure or a multi-permanent magnet structure with split installation.

[0038] In the alternative structure of the permanent magnet 21, as Figure 5 shown, the polarities of the two outer sub-permanent magnets 211 in each permanent magnet 21 are opposite, and the magnetic core 22 of the middle sub-permanent magnet 211 is perpendicular to the direction from the N pole to the S pole of the outer sub-permanent magnets 211 in the direction from the N pole to the S pole; the polarity of any one sub-permanent magnet 211 in one permanent magnet 21 is opposite to the polarity of the corresponding sub-permanent magnet 211 in another permanent magnet 21.

[0039] Compared with the related art, in the linear vibration motor 100 of this embodiment, by designing the mover 2 into two groups of permanent magnets 21 that are spaced apart and arranged in parallel, and designing the stator 3 into a coil located between the two groups of permanent magnets 21, the winding plane of the coil is also parallel to the vibration direction of the mover 2, and at the same time, the opposite ends of the coil in the second direction are respectively fixed to the opposite sides of the housing 1. In this way, the magnetic field lines can be completely closed through the design of the double permanent magnets 21, thereby improving the driving efficiency of the stator 3 for driving the mover 2.

[0040] The above are only the embodiments of the present invention. It should be noted here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these all belong to the protection scope of the present invention.

Claims

1. A linear vibration motor, comprising a housing, a mover and a stator accommodated in the housing at intervals, and an elastic member elastically suspending the mover in the housing, wherein the stator is fixed to the housing and used to drive the mover to vibrate; characterized in that: The mover includes two groups of magnets that are spaced apart from each other and arranged in parallel; the stator includes a coil that is arranged between the two groups of magnets and spaced apart from the two groups of magnets in a first direction, a winding plane of the coil is parallel to the vibration direction of the mover, and opposite ends of the coil along the second direction are respectively fixed to opposite sides of the shell, and the first direction, the second direction and the vibration direction of the mover are perpendicular to each other.

2. The linear vibration motor according to claim 1, characterized in that: Each group of the magnetic steels includes a three-section magnetized magnetic steel, and the magnetization directions of the three-section magnetized magnetic steels form a Halbach array; or each group of the magnetic steels includes three sub-magnetic steels stacked in sequence along the vibration direction of the mover, and the three sub-magnetic steels form a Halbach array.

3. The linear vibration motor according to claim 1, characterized in that: The linear vibration motor also includes a flexible circuit board fixed in the shell and extending outside the shell, and the coil is electrically connected to the flexible circuit board; the elastic member includes two elastic members that are distributed at intervals on opposite sides of the mover along the vibration direction of the mover, and the two elastic members are respectively fixed on opposite sides of the shell and together elastically suspend the mover in the shell.

4. The linear vibration motor according to claim 3, characterized in that: The mover also includes a pole core which is stacked and fixed on a side of each group of magnetic steels away from another group of magnetic steels.

5. The linear vibration motor according to claim 4, characterized in that: The mover also includes a mass block; the mass block has a through hole penetrating along the second direction, the magnetic steel and the pole core are both fixed in the through hole, and the magnetic steel is fixed to the mass block through the pole core; the elastic member is connected between the mass block and the shell.

6. The linear vibration motor according to claim 5, characterized in that: The linear vibration motor further includes an elastic shock absorbing member connecting the housing and the mass block.

7. The linear vibration motor according to claim 6, characterized in that: The mass block is rectangular; the elastic shock absorbing members include two and are spaced apart from each other, and the two elastic shock absorbing members are respectively located at one set of diagonal positions of the mass block.

8. The linear vibration motor according to claim 3, characterized in that: The shell includes a bottom plate and an upper cover which is arranged on the bottom plate and together with the bottom plate to form a receiving space; the mover, the stator and the elastic member are all accommodated in the receiving space, the opposite ends of the coil along the second direction are respectively fixed to the bottom plate and the side of the upper cover opposite to the bottom plate, and the flexible circuit board is fixed to the bottom plate and extends through the upper cover to the outside of the receiving space.

9. The linear vibration motor according to claim 5, characterized in that: Each of the elastic members includes a first fixed arm fixed to the shell, a second fixed arm fixed to the mass block, and an elastic arm bent and extended from the first fixed arm toward the second fixed arm and fixedly connected to the second fixed arm.

10. The linear vibration motor according to claim 1, wherein: The opposite ends of the coil along the second direction are fixed to the housing by glue or adhesive blocks respectively.

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