WO2022267306A1

WO2022267306A1 - Linear vibrating motor

Info

Publication number: WO2022267306A1
Application number: PCT/CN2021/129980
Authority: WO
Inventors: 史德璋; 张雨晴; 高文花
Original assignee: 歌尔股份有限公司
Priority date: 2021-06-25
Filing date: 2021-11-11
Publication date: 2022-12-29
Also published as: CN215580856U

Abstract

An embodiment of the present utility model discloses a linear vibrating motor, comprising a housing, a vibration assembly and stator assembly which are accommodated in the housing, and an elastic support member which supports the vibration assembly. The stator assembly comprises a coil, the axial direction of which in a horizontal plane is perpendicular to the vibration direction of the vibration assembly. The vibration assembly comprises: two mass blocks arranged along the vibration direction of the vibration assembly and two sets of magnetic circuit structures arranged along the axial direction of the coil. The vibration assembly comprises a vibration cavity, and the coil is located in the vibration cavity. The magnetic circuit structures comprise: a magnetic set and a magnetic conductive plate bound and fixed to the side of the magnetic set distant from the coil. The magnetic set is sandwiched and fixed between the two mass blocks. In the present utility model, the magnetic field strength of magnetic circuit structures can be effectively increased, thereby increasing the driving force of a motor structure and providing, for market products, more possibilities to select a linear vibrating motor having a large vibrating sensation within a limited space.

Description

A linear vibrating motor

technical field

The utility model belongs to the technical field of electronic products. More specifically, it relates to a linear vibration motor.

Background technique

With the development of electronic technology, portable consumer electronic products are becoming more and more popular, such as mobile phones, handheld game consoles, navigation devices or handheld multimedia entertainment equipment, etc. These electronic products generally use vibration motors for system feedback. Such as mobile phone call prompts, information prompts, navigation prompts, vibration feedback of game consoles, etc.

The linear vibration motor technology is also developing in the direction of small size, large vibration, fast response, low power consumption, and low magnetic leakage, but it is difficult for the existing motor structure to have all the above advantages. The driving force is the main parameter of the linear vibration motor, achieving greater driving in a limited space can bring higher competitiveness to the product.

Utility model content

In order to solve the above problems, the utility model provides a linear vibration motor to improve the driving force of the linear vibration motor.

In order to achieve the above object, the utility model adopts the following technical solutions:

A linear vibration motor, comprising a housing, a vibration assembly accommodated in the housing, a stator assembly, and an elastic support for supporting the vibration assembly, the stator assembly includes an axis in a horizontal plane whose direction is perpendicular to the vibration direction of the vibration assembly Coil;

The vibrating components include:

two masses aligned along the direction of vibration of the vibrating assembly, and

Two sets of magnetic circuit structures arranged along the axial direction of the coil;

The vibrating assembly includes a vibrating cavity, and the coil is located in the vibrating cavity;

The magnetic circuit structure includes:

magnetic group; and

Combined with the magnetic conductive plate fixed on the side of the magnetic group away from the coil;

The magnetic group is interposed and fixed between two mass blocks.

In addition, preferably, the magnetic conductive plate covers at least the surface of the magnetic group facing away from the coil; the two magnetic conductive plates are arranged symmetrically about the center.

In addition, the preferred solution is that the cavity formed by the two mass blocks and the two sets of magnetic circuit structures is the vibration cavity.

In addition, preferably, the magnetically conductive plate includes:

Flatly attached to the straight part of the surface of the magnetic group away from the coil;

a bent portion extending from one end of the straight portion to the direction of the coil, and

An extension part extending from an end of the bending part away from the straight part along the outer wall surface of the mass block.

In addition, preferably, the outer wall surface of the mass block includes a groove for accommodating the bent portion and the extending portion.

In addition, it is preferred that the elastic support includes a first fixing part combined with the housing, a second fixed part combined with the vibration assembly, and an elastic part connecting the first fixed part and the second fixed part ;

The second fixing part is combined and fixed on the extension part.

In addition, preferably, the stator assembly includes two coils arranged along the vibration direction of the vibration assembly; the two coils are energized in opposite directions.

In addition, the preferred solution is that the magnetic group includes a central magnet and two side magnets arranged at both ends of the central magnet along the vibration direction; wherein, the magnetization direction of the central magnet is opposite to that of the side magnets, and the charging direction of the two side magnets is opposite to that of the side magnets. same magnetic direction;

The magnetization directions of the two magnetic groups are the same.

In addition, it is preferred that the projection of the junction of the central magnet and the side magnet on the inner cavity of the coil is within the width range defined by the inner cavity of the coil.

In addition, preferably, the inner cavity of the coil includes a core body; the projection of the junction of the central magnet and the side magnet on the inner cavity of the coil is located within the width range defined by the core body.

The beneficial effects of the application are as follows:

Aiming at the technical problems existing in the prior art, the linear vibration motor provided by this application forms a vibration cavity through two mass blocks and two sets of magnetic circuit structures. While ensuring the necessary vibration space between the vibrator assembly and the coil, it can Effectively increase the structural size of the magnetic group of the vibration component and increase the magnetic field strength, thereby effectively improving the driving force of the linear vibration motor, providing more possibilities for market products to choose linear vibration motors with greater vibration in a limited space. For the specific advantages of the utility model compared with the prior art, each technical feature will be described in detail in the following specific embodiments.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

Fig. 1 shows an exploded view of the linear vibration motor provided by the present invention.

Fig. 2 shows a cross-sectional view of the linear vibration motor provided by the present invention.

Fig. 3 shows a cross-sectional view from another angle of the linear vibration motor provided by the present invention.

Fig. 4 shows a schematic diagram of the assembly structure of the vibration assembly provided by the present invention.

detailed description

In order to illustrate the utility model more clearly, the utility model will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present utility model.

In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower" and so on is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed, or operate in a particular orientation, and thus should not be construed as limiting the application. Unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, or an indirect connection through an intermediary, or an internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

It should also be noted that in the description of the present application, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these No such actual relationship or order exists between entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

In order to overcome the defects existing in the prior art, the embodiment of the utility model provides a linear vibration motor 100, as shown in Fig. 1-3, specifically, the linear vibration motor 100 includes a housing 1 and a The vibrating component 2, the stator component 3 and the elastic support 4 supporting the vibrating component 2 in the body.

The housing 1 includes a top wall 11, a bottom wall 13 opposite to the top wall 11, and a side wall 15 connecting the top wall 11 and the bottom wall 13, the top wall 11, the bottom wall 13 and the side walls 15 Cooperate with the storage space of the siege, the vibration assembly 2, the stator assembly 3 and the elastic support member 4 are accommodated in the storage space.

The side wall 15 includes two parallel long sides 151 arranged at intervals and two short sides 153 arranged at two ends of the long side 151 and connecting the two long sides 151, the long side 151 and the short side 153 can adopt integral molding structure, also can adopt split design and connect and fix. In this embodiment, the top wall 11 and the side wall 15 are integrally formed, and the bottom wall 13 is directly covered on the side wall 15, which can facilitate the assembly of the linear vibration motor 100. In other implementations In another way, the side wall 15 can also be integrally formed with the bottom wall 13 .

With reference to the illustrated structure, in this embodiment, the stator assembly 3 is fixed in the housing 1, specifically, the stator assembly 3 is fixed on the bottom wall 13, and the stator assembly 2 includes an axis in the horizontal plane The coil 31 whose direction is perpendicular to the vibration direction of the vibration component 2 . The coil 31 is connected to an external power source through the FPC board 5 , the FPC board is fixed on the bottom wall 13 , and one end of the FPC board extends out of the receiving space to be electrically connected to an external circuit. The vibration assembly 2 is used for vibration. Specifically, the vibration assembly 2 includes two mass blocks 21 arranged along the vibration direction of the vibration assembly 2, and two sets of magnetic circuit structures 22 arranged along the axial direction of the coil 31, two groups The magnetic circuit structure 22 is distributed on two opposite sides of the coil 31 , and the counterweight 21 is suspended in the containing space. It can be understood that the mass block 21 is used to increase the inertia of the vibrating assembly 2 to enhance the vibration feeling. The magnetic circuit structure 22 is used to provide a magnetic field. The coil 31 is located in the magnetic field of the two magnetic circuit structures 22 , and the magnetic circuit structure 22 cooperates with the coil 31 to drive the vibrating assembly 2 to vibrate.

In order to meet the requirement that the vibrating component can vibrate back and forth relative to the stator component, the vibrating component 2 includes a vibrating cavity 20 , and the coil 31 is accommodated in the vibrating cavity 20 . As shown in FIG. 2 to FIG. 4 , in this embodiment, the magnetic circuit structure 22 includes a magnetic group 221 and a magnetically conductive plate 222 fixed on the side of the magnetic group 221 away from the coil 31 , and the magnetic group 221 Sandwiched between two mass blocks 21 , two sets of magnetic circuit structures are combined and fixed with the two mass blocks 21 to form the vibration assembly 2 . In the traditional motor structure, as the mass block and the magnetic circuit structure of the vibration component, in order to achieve a good fixation of the magnetic circuit structure and the mass block, the mass block will occupy a certain space in the axial direction of the coil perpendicular to the vibration direction of the vibration component. Therefore, the structural size of the magnetic group is restricted in this direction, which affects the overall comprehensive performance of the motor. In the motor structure provided in this embodiment, two magnetic groups are interposed and fixed between two mass blocks, and the combination and fixation of the two magnetic groups and the two mass blocks together constitute the vibration assembly. The size of the magnetic group structure can be significantly increased in the side direction (the axial direction of the coil in the figure). Higher drive.

In this embodiment, the magnetically permeable plate 222 is made of a magnetically permeable material, which can play a magnetically permeable role, avoid the scattering of the magnetic induction lines, increase the magnetic flux of the coil, strengthen the Lorentz force, and effectively enlarge the vibrator assembly. The size of the vibration force and the vibration effect. In a specific embodiment, the magnetically conductive plate 222 at least covers the surface of the magnetic group 221 on a side away from the coil 31 , so as to avoid the scattering of magnetic induction lines. In order to improve the bonding strength between the magnetic group 221 and the mass block 21 and improve the service life of the linear vibration motor 100, the magnetic conductive plate 222 should cover the mass while ensuring that the outer surface of the magnetic group 221 is covered. The outer wall surface of the block 21. In this embodiment, as shown in FIG. 2 , in order to ensure that the vibrating assembly vibrates stably in the specified direction in the housing and avoid polarization, the two magnetic conductive plates 22 are arranged symmetrically about the center.

In this embodiment, the two mass blocks 21 and the two sets of magnetic circuit structures 22 surround the outside of the coil 31, and the cavity formed by the two mass blocks 21 and the two sets of magnetic circuit structures 22 is Vibration cavity 20, the magnetic guide plate 222 covers the outer surface of the magnetic group 221 and the outer wall surface of the mass block 21, the magnetic flux line does not scatter, has a more efficient magnetic concentration effect, and realizes the effective utilization of the magnetic flux line. Achieve larger drive in limited space. Moreover, this design also increases the bonding area between the magnetic circuit structure 22 and the mass block 21, enhances the bonding strength, and improves the service life.

In a specific example, the magnetically conductive plate 222 includes a straight portion 2221 that is flatly attached to the surface of the magnetic group 221 facing away from the coil 31 , from one end of the straight portion 2221 to the coil 31 The bent portion 2222 is bent and extended, and the extension portion 2223 extends from an end of the bent portion 2222 away from the straight portion 2221 along the outer wall surface of the proof mass 21 . Wherein, the straight portion 2221 includes a portion corresponding to the outer wall surface of the mass block 21 .

In this embodiment, the outer wall surface of the mass block 21 includes a groove 210 for accommodating the bent portion 2222 and the extension portion 2223. It can be understood that the groove 210 corresponds to the extension portion 2223 and the extension portion 2223. In the bending portion 2222, the groove 210 is formed by inwardly recessing the outer side wall of the long axis side of the mass block 21. As shown in FIG. 2 , setting the groove 21 can reduce the size increase of the vibrating assembly 2 in the vertical vibration direction, and can reduce the structural size, thereby reducing the overall volume of the linear vibration motor 100 and meeting the requirement of miniaturization.

In this embodiment, there are two elastic supports 4 , which are arranged on both sides of the vibration assembly 2 along the vibration direction. The four elastic supports are U-shaped springs, and the opening directions of the two elastic supports 4 are oppositely arranged. The elastic support member 4 includes a first fixing part 41 combined and fixed with the housing 1 , a second fixed part 42 combined and fixed with the vibration assembly 2 , and an elastic part connecting the first fixed part 41 and the second fixed part 42 43. Specifically, the second fixing portion 42 and the first fixing portion 41 are arranged at intervals along the short axis of the mass block 21 , and the second fixing portion 42 is combined and fixed on the extension portion 2223 .

Between the first fixing part 41 and the housing 1 and between the second fixing part 42 and the magnetic permeable plate 222 are combined and fixed by the blocking piece 6, and the blocking piece 6 can not only increase the bonding area, but also enhance The bonding force of the elastic support member 4 can also prevent the elastic support member 4 from breaking due to excessive bending.

In a specific example, the stator assembly 3 includes two coils 31 arranged along the vibration direction of the vibration assembly 2 , and the current directions of the two coils 31 are opposite. In this embodiment, the inner cavity of the coil 31 includes a core 32, and the height of the core 32 perpendicular to the vibration direction should be smaller than the height of the coil 31 perpendicular to the vibration direction, so that the vibration direction The static suction is reduced. Optionally, the core 32 is made of iron-silicon alloy, and its shape is a columnar structure, and the coil 31 is sheathed on the outer circumference of the core 32 . During installation, the coil 31 is inserted from one end of the core 32 to facilitate assembly and disassembly.

As shown in Figure 2 and Figure 3, in this technical solution, when the coil 31 is energized, the coil 31 cooperates with the core 32 to form an electromagnet structure, the coil 31 generates a magnetic field, and the core 32 is magnetized, and the magnetic field generated by the magnetization of the core 32 and the magnetic field of the coil 31 are superimposed on each other, so that the magnetism of the coil 31 is greatly increased.

Further, when the current directions of the two coils 31 are opposite, the directions of the generated magnetic fields are also opposite. The magnetic fields generated by the two coils 31 are superimposed on each other, which strengthens the magnitude of the electromagnetic force, and acts on the vibrating component 2 at the same time, which can increase the magnitude of the driving force and improve the vibration effect of the vibrating component 2 .

In this embodiment, the magnetic groups 221 are magnetized along a direction perpendicular to the vibration direction of the vibrating assembly 2 , and the magnetization directions of the two magnetic groups 221 are the same. Specifically, the magnetic group 221 includes a central magnet 2211 and two side magnets 2212 arranged at both ends of the central magnet 2211 along the vibration direction. Wherein, referring to FIG. 4 , the magnetization directions of the center magnet 2211 and the side magnets 2212 are opposite, and the magnetization directions of the two side magnets 2212 are the same.

In order to increase the effective area where the lines of magnetic flux pass through the coil 31, thereby improving the utilization rate of the coil, the projection of the junction of the central magnet 2211 and the side magnet 2212 on the inner cavity of the coil 31 is located in the inner cavity of the coil 31 within the defined width range. In one embodiment, when a core is included inside the coil, the projection of the junction of the central magnet 2211 and the side magnet 2212 on the inner cavity of the coil 31 is within the width range defined by the core 32 Inside.

In a specific embodiment, the linear vibration motor 100 includes two limit blocks 7, the two limit blocks 7 and a half are located outside the two ends of the vibration direction of the vibration component 2, and are combined and fixed on On the housing 1, in this embodiment, two limiting blocks 7 are arranged on the sides corresponding to the two short axes of the mass block 21 to limit the displacement of the vibrating assembly 2 and protect the vibrating assembly 2. Prevent it from colliding with the housing 1 due to excessive vibration amplitude.

In one embodiment, the material of the housing 1 is made of a material with magnetic properties, and a closed magnetically conductive shell can reduce the magnetic flux leakage of the motor structure and improve the magnetic field utilization rate and driving force of the magnetic group structure. .

Usually, when the magnetic circuit structure is used as a vibrator component, the magnetic group is mostly combined and fixed in the vibration cavity formed by the mass block. In order to ensure the necessary vibration space between the vibrator component and the coil, the structural size of the magnetic group will be limited. And in order to avoid the dispersion of the magnetic induction lines, strengthen the Lorentz force, and effectively increase the vibration force and vibration effect of the vibrator assembly, the magnetic permeable plate needs to be arranged between the magnetic group and the vibration cavity wall, thereby further limiting The structural size of the magnetic group is determined, which affects the vibration force and vibration effect of the vibrator assembly. However, in the embodiment provided by the utility model, two mass blocks and two sets of magnetic circuit structures jointly constitute the vibration cavity, so that the structural size of the magnetic set will not be limited, and the magnetic induction intensity is stronger, making the linear vibration The driving force of the motor is also effectively improved. In practical applications, multiple magnets can be combined and fixed by magnetic plates to form a magnetic group structure, and then assembled with the mass block. While the assembly is convenient, the bonding and fixing strength between each magnet and the mass block can be increased to improve the connection quality .

Apparently, the above-mentioned embodiments of the utility model are only examples for clearly illustrating the utility model, rather than limiting the implementation of the utility model. For those of ordinary skill in the art, on the basis of the above description It is also possible to make other changes or changes in different forms, and all implementation modes cannot be exhausted here, and all obvious changes or changes that belong to the technical solutions of the present utility model are still within the scope of protection of the present utility model .

Claims

A linear vibrating motor, comprising a housing, a vibrating assembly accommodated in the housing, a stator assembly, and an elastic support for supporting the vibrating assembly, wherein the stator assembly includes a horizontal plane in which the axis direction is perpendicular to the vibration Coils in the direction of component vibration;

The vibrating components include:

two masses aligned along the direction of vibration of the vibrating assembly, and

Two sets of magnetic circuit structures arranged along the axial direction of the coil;

The vibrating assembly includes a vibrating cavity, and the coil is located in the vibrating cavity;

The magnetic circuit structure includes:

magnetic group; and

Combined with the magnetic conductive plate fixed on the side of the magnetic group away from the coil;

The magnetic group is interposed and fixed between two mass blocks.
The linear vibration motor according to claim 1, wherein the magnetic conductive plate covers at least the surface of the magnetic group facing away from the coil; and the two magnetic conductive plates are arranged symmetrically about the center.
The linear vibration motor according to claim 1, wherein the cavity formed by the two masses and the two sets of magnetic circuit structures is the vibration cavity.
The linear vibration motor according to claim 1, wherein the magnetic permeable plate comprises:

Flatly attached to the straight part of the surface of the magnetic group away from the coil;

a bent portion extending from one end of the straight portion to the direction of the coil, and

An extension part extending from an end of the bending part away from the straight part along the outer wall surface of the mass block.
The linear vibration motor according to claim 4, characterized in that, the outer wall surface of the mass block includes a groove for accommodating the bent portion and the extending portion.
The linear vibration motor according to claim 4, characterized in that, the elastic support includes a first fixing part combined and fixed with the housing, a second fixing part combined and fixed with the vibration assembly, and a connection with the first fixing part and the elastic part of the second fixing part;

The second fixing part is combined and fixed on the extension part.
The linear vibration motor according to claim 1, wherein the stator assembly includes two coils arranged along the vibration direction of the vibration assembly; the two coils are energized in opposite directions.
The linear vibration motor according to claim 7, wherein the magnetic group includes a central magnet and two side magnets arranged at both ends of the central magnet along the vibration direction; wherein, the magnetization directions of the central magnet and the side magnets are On the contrary, the magnetization directions of the two side magnets are the same;

The magnetization directions of the two magnetic groups are the same.
The linear vibration motor according to claim 8, wherein the projection of the junction of the central magnet and the side magnet on the inner cavity of the coil is within the width range defined by the inner cavity of the coil.
The linear vibration motor according to claim 8, wherein the inner cavity of the coil includes a core body; the projection of the junction of the center magnet and the side magnet on the inner cavity of the coil is located at the core body within the specified width.