WO2022062154A1

WO2022062154A1 - Vibration electric motor

Info

Publication number: WO2022062154A1
Application number: PCT/CN2020/131366
Authority: WO
Inventors: 崔志勇; 毛路斌
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-09-28
Filing date: 2020-11-25
Publication date: 2022-03-31
Also published as: CN213461489U

Abstract

A vibration electric motor, comprising a housing (100), and a vibrator (200) and a stator (300), which are accommodated in the housing (100), wherein one of the vibrator (200) and the stator (300) comprises a solenoid structure (310), and the other one of the vibrator (200) and the stator (300) comprises a magnetic circuit structure (210); the solenoid structure (310) comprises an iron core (311), a coil (312) wound around the iron core (311), and pole shoes (313) fixed at two ends of the iron core (311); and the iron core (311) comprises a body (3111) and several magnetic conductive sheets (3112) stacked opposite the body (3111), and the magnetic conductive performance of at least one magnetic conductive sheet (3112) is stronger than that of the body (3111). The solenoid structure (310) or the magnetic circuit structure (210) is driven to vibrate by means of interaction between the solenoid structure (310) and the magnetic circuit structure (210), so as to realize the vibration of the vibration electric motor. The iron core (311) comprises the body (3111) and the several magnetic conductive sheets (3112) stacked opposite the body (3111), and the magnetic conductive performance of at least one magnetic conductive sheet (3112) is stronger than that of the body (3111), such that it is more difficult for the iron core (311) to reach magnetic saturation, and thus, the driving force applied to the vibrator (200) does not decrease when the vibrator vibrates to the maximum amplitude, thereby improving the performance of the vibration electric motor.

Description

Vibration motor

technical field

The present application relates to the field of motors, and in particular, to a vibration motor.

Background technique

With the development of electronic technology, portable consumer electronic products are more and more sought after by people, 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, and vibration feedback from game consoles. Such a wide range of applications requires high performance and long service life of the vibration motor.

technical problem

The iron core of the solenoid structure of the vibration motor in the related art is made of a single material, which is easy to achieve magnetic saturation, and then when the vibrator vibrates to the maximum amplitude, the driving force received by the vibrator will be weakened, resulting in poor performance of the vibration motor. good.

Therefore, it is necessary to provide a new type of vibration motor to solve the above problems.

technical solutions

The purpose of this application is to provide a vibration motor with better performance.

The technical solution of the present application is as follows: a vibration motor, comprising a housing with a receiving space, a vibrator and a stator contained in the receiving space, one of the vibrator and the stator including a solenoid structure, the The other of the vibrator and the stator includes a magnetic circuit structure;

The solenoid structure includes an iron core, a coil wound on the iron core, and pole pieces fixed on both ends of the iron core;

The iron core includes a main body and a plurality of magnetic conductive sheets stacked opposite to the main body, and the magnetic conductivity of at least one of the magnetic conductive sheets is stronger than that of the main body.

As an embodiment of the present application, there are two magnetic conductive sheets, which are a first magnetic conductive sheet and a second magnetic conductive sheet arranged on opposite sides of the main body and arranged relatively parallel to each other.

As an embodiment of the present application, the magnetic permeability of the first magnetic conductive sheet is the same as that of the second magnetic conductive sheet.

As an embodiment of the present application, the magnetic circuit structure includes two relatively parallel first magnetic frames disposed on both sides of the solenoid structure, and two relatively parallel and perpendicular to the first magnetic frame. a second magnetic frame, a first magnetic steel group fixed on the side of the first magnetic frame facing the solenoid structure, and a first magnetic steel group fixed on the side of the second magnetic frame facing the solenoid structure In the second magnetic steel group, the two first magnetic frames and the two second magnetic frames are enclosed to form an accommodation cavity for accommodating the solenoid structure.

As an embodiment of the present application, the stator is fixed to the housing, the stator includes the solenoid structure, and the vibrator includes the magnetic circuit structure.

As an embodiment of the present application, the vibrator further includes a counterweight block arranged around the magnetic circuit structure, and the magnetic circuit structure is fixed on the counterweight block.

As an embodiment of the present application, the vibration motor further includes an elastic support member accommodated in the housing and suspendingly supporting the vibrator.

As an embodiment of the present application, the elastic support includes a first fixing arm fixed to the counterweight, a second fixing arm fixed to the housing, and connecting the first fixing arm and the first fixing arm Two elastic arms of fixed arms.

As an embodiment of the present application, the housing includes an upper cover plate and a lower cover plate that are relatively parallel and spaced apart, and a side plate for connecting the upper cover plate and the lower cover plate, the upper cover plate , the lower cover plate and the side plate are enclosed to form the receiving space, and the solenoid structure is fixed on the lower cover plate.

As an embodiment of the present application, the vibration motor further includes a first limit block and a second limit block disposed on the lower cover plate, the first limit block and the second limit block They are respectively arranged on the moving path of the vibrator.

beneficial effect

The beneficial effect of the present application is that: through the interaction between the solenoid structure and the magnetic circuit structure, the solenoid structure or the magnetic circuit structure is driven to vibrate, thereby realizing the vibration of the vibration motor. Several magnetic conductive sheets, and at least one of the magnetic conductive sheets has better magnetic conductivity than the main body, which makes it more difficult for the iron core to reach magnetic saturation, and the driving force received by the vibrator when it vibrates to the maximum amplitude will not become smaller, The performance of the vibration motor in this embodiment is improved.

Description of drawings

1 is a schematic diagram of the overall structure of a vibration motor according to an embodiment of the application;

Fig. 2 is the exploded schematic diagram of the vibration motor in Fig. 1;

Fig. 3 is the partial structure schematic diagram in Fig. 1;

FIG. 4 is a schematic structural diagram of the stator in FIG. 1 .

100, housing; 101, storage space; 110, upper cover plate; 120, lower cover plate; 130, side plate; 200, vibrator; 210, magnetic circuit structure; 211, first magnetic frame; 212, second magnetic frame ; 213, the first magnet group; 2131, the first magnet; 2132, the second magnet; 2133, the third magnet; 214, the second magnet group; 220, the counterweight; 300, the stator; 310, Solenoid structure; 311, iron core; 3111, body; 3112, magnetic conductive sheet; 3112a, first magnetic conductive sheet; 3112b, second magnetic conductive sheet; 312, coil; 313, pole piece; 400, elastic support 410, the first fixed arm; 420, the second fixed arm; 430, the elastic arm; 440, the welding piece; 510, the first limit block; 520, the second limit block.

Embodiments of the present invention

To further illustrate the various embodiments, the present application provides accompanying drawings. These drawings are part of the disclosure content of the present application, and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant description of the specification to explain the operation principles of the embodiments. With reference to these contents, one of ordinary skill in the art will understand other possible implementations and advantages of the present application. Components in the figures are not drawn to scale, and similar component symbols are often used to represent similar components.

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

Referring to FIGS. 1 to 4 , an embodiment of the present application provides a vibration motor. The vibration motor in this embodiment includes a housing 100 having an accommodation space 101 , a vibrator 200 and a stator 300 accommodated in the accommodation space 101 , One of the vibrator 200 and the stator 300 includes a solenoid structure 310 , and the other of the vibrator 200 and the stator 300 includes a magnetic circuit structure 210 . The interaction between the stator 300 and the vibrator 200 drives the vibrator 200 to vibrate.

Preferably, the stator 300 is fixed to the casing 100 , the stator 300 includes a solenoid structure 310 , and the vibrator 200 includes a magnetic circuit structure 210 .

Referring to FIG. 1 and FIG. 2 , in one embodiment, the housing 100 includes an upper cover 110 and a lower cover 120 that are relatively parallel and spaced apart, and a side plate 130 for connecting the upper cover 110 and the lower cover 120 , the upper cover plate 110 , the lower cover plate 120 and the side plate 130 are enclosed to form the above-mentioned receiving space 101 , and the stator 300 is fixed on the upper cover plate 110 or the lower cover plate 120 .

Preferably, the casing 100 is made of a magnetically conductive material, so as to better guide the magnetic field and improve the utilization rate of the magnetic field.

Referring to FIG. 4 , in one embodiment, the solenoid structure 310 includes an iron core 311 , a coil 312 wound on the iron core 311 , and pole shoes 313 fixed at both ends of the iron core 311 ; the iron core 311 includes a body 3111 and Several magnetic conductive sheets 3112 are stacked opposite to the body 3111 , and at least one magnetic conductive sheet 3112 has a magnetic conductivity stronger than that of the body 3111 . Since the iron core 311 includes the main body 3111 and a plurality of magnetic conductive sheets 3112 stacked opposite to the main body 3111 , and at least one magnetic conductive sheet 3112 has better magnetic conductivity than that of the main body 3111 , the iron core 311 is more difficult to achieve The magnetic saturation is achieved, so that the driving force received by the vibrator 200 when the vibrator 200 vibrates to the maximum amplitude will not be reduced, which improves the performance of the vibration motor in this embodiment.

Referring to FIG. 4 , in one embodiment, there are two magnetic conductive sheets 3112 , which are a first magnetic conductive sheet 3112 a and a second magnetic conductive sheet 3112 b disposed on opposite sides of the main body 3111 and disposed relatively parallel. Preferably, the magnetic permeability of the first magnetic conductive sheet 3112 a and the second magnetic conductive sheet 3112 b are both stronger than that of the body 3111 .

It should be noted that the number of the magnetic conductive sheets 3112 included in the iron core 311 in this embodiment is not specifically limited, and the number of the magnetic conductive sheets 3112 can be adjusted according to different needs. For example, the number of the magnetic conductive sheets 3112 can also be 4, 5 or other quantities.

Preferably, the magnetic permeability of the first magnetic conductive sheet 3112a is the same as that of the second magnetic conductive sheet 3112b.

Referring to FIG. 2 and FIG. 3 , in one embodiment, the magnetic circuit structure 210 includes two relatively parallel first magnetic frames 211 disposed on both sides of the solenoid structure 310 . Two second magnetic frames 212 perpendicular to the magnetic frame 211 , a first magnetic steel group 213 fixed on the side of the first magnetic frame 211 facing the solenoid structure 310 , and a first magnetic steel group 213 fixed on the second magnetic frame 212 Towards the second magnetic steel group 214 on the side of the solenoid structure 310 , the two first magnetic frames 211 and the two second magnetic frames 212 are enclosed to form an enclosure for accommodating the solenoid structure 310's containment cavity.

Specifically, each magnetic conductive sheet 3112 is a long strip, each magnetic conductive sheet 3112 is located between the two first magnetic frames 211 and the two second magnetic frames 212, and the length direction of each magnetic conductive sheet 3112 is directed toward the first magnetic frame 211. Preferably, each of the two magnetic frames 212 is parallel to the first magnetic frame 211 .

Referring to FIG. 2 and FIG. 3 , in one embodiment, the first magnetic steel group 213 includes a first magnetic steel 2131 and a second magnetic steel 2132 fixed on the first magnetic frame 211 at intervals to be fixed on the first magnetic steel A third magnet 2133 on the frame 211 and sandwiched between the first magnet 2131 and the second magnet 2132.

In some embodiments, the first magnet 2131, the second magnet 2132, and the third magnet 2133 may be arranged in a Halbach array.

In one embodiment, the second magnet steel group 214 includes a single magnet steel, of course, the second magnet steel group 214 may also be composed of several magnet steels.

2 and FIG. 3 , in one embodiment, the vibrator 200 further includes a weight block 220 disposed around the magnetic circuit structure 210 , and the magnetic circuit structure 210 is fixed on the weight block 220 .

Referring to FIG. 2 and FIG. 3 , in one embodiment, the vibration motor further includes an elastic support member 400 that is accommodated in the housing 100 and supports the vibrator 200 in a suspended manner.

Please refer to FIG. 2 and FIG. 3 . Specifically, the elastic support 400 includes a first fixing arm 410 fixed to the counterweight 220 , a second fixing arm 420 fixed to the housing 100 and connecting the The first fixed arm 410 and the elastic arm 430 of the second fixed arm 420 .

Preferably, there are two elastic support members, which are respectively disposed at both ends of the counterweight 220 in the vibration direction.

Specifically, the first fixing arm 410 and the counterweight 220 are welded together by the soldering piece 440 , and the second fixing arm 420 and the casing 100 are welded together by the soldering piece 440 .

Referring to FIG. 2 and FIG. 3 , in one embodiment, the vibration motor further includes a first limit block 510 and a second limit block 520 disposed on the lower cover, the first limit block 510 and the second limit block 510 The bit blocks 520 are respectively arranged on the moving paths of the vibrator 200 . The first limiting block 510 and the second limiting block 520 can prevent the vibration amplitude of the vibrator 200 from being too large to cause damage to the vibration motor.

The above are only the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of the present application, but these belong to the present application. scope of protection.

Claims

A vibrating motor is characterized in that it comprises a casing with an accommodation space, a vibrator and a stator accommodated in the accommodation space, one of the vibrator and the stator comprises a solenoid structure, the vibrator and the The other side of the stator includes a magnetic circuit structure;

The solenoid structure includes an iron core, a coil wound on the iron core, and pole pieces fixed on both ends of the iron core;

The iron core includes a main body and a plurality of magnetic conductive sheets stacked opposite to the main body, and the magnetic conductivity of at least one of the magnetic conductive sheets is stronger than that of the main body.
The vibration motor according to claim 1, wherein there are two magnetic conductive sheets, which are a first magnetic conductive sheet and a second magnetic conductive sheet arranged on opposite sides of the main body and arranged relatively in parallel.
The vibration motor according to claim 2, wherein the magnetic permeability of the first magnetic conductive sheet is the same as that of the second magnetic conductive sheet.
The vibration motor according to claim 1, wherein the magnetic circuit structure comprises two relatively parallel first magnetic frames disposed on both sides of the solenoid structure, and two relatively parallel first magnetic frames arranged in parallel with the second magnetic frame. Two second magnetic frames perpendicular to the magnetic frame, a first magnetic steel group fixed on the side of the first magnetic frame facing the solenoid structure, and a first magnetic steel group fixed on the second magnetic frame facing the solenoid In the second magnetic steel group on one side of the tube structure, the two first magnetic frames and the two second magnetic frames are enclosed to form an accommodation cavity for accommodating the solenoid structure.
The vibration motor according to any one of claims 1 to 4, wherein the stator is fixed to the housing, the stator includes the solenoid structure, and the vibrator includes the magnetic circuit structure.
The vibration motor according to claim 5, wherein the vibrator further comprises a counterweight block arranged around the magnetic circuit structure, and the magnetic circuit structure is fixed on the counterweight block.
The vibration motor according to claim 6, wherein the vibration motor further comprises an elastic support member accommodated in the casing and suspended and supporting the vibrator.
The vibration motor according to claim 7, wherein the elastic support member comprises a first fixed arm fixed to the counterweight, a second fixed arm fixed to the housing, and a second fixed arm connected to the first The fixed arm and the elastic arm of the second fixed arm.
The vibration motor according to claim 5, wherein the casing comprises an upper cover plate and a lower cover plate that are relatively parallel and spaced apart, and a side plate for connecting the upper cover plate and the lower cover plate , the upper cover plate, the lower cover plate and the side plate are enclosed to form the receiving space, and the solenoid structure is fixed on the lower cover plate.
The vibration motor according to claim 9, wherein the vibration motor further comprises a first limit block and a second limit block arranged on the lower cover plate, the first limit block and the The second limiting blocks are respectively arranged on the moving path of the vibrator.