CN220964615U

CN220964615U - Linear motor

Info

Publication number: CN220964615U
Application number: CN202322403085.5U
Authority: CN
Inventors: 陈为博; 周晓荣; 张紫阳; 王科阳
Original assignee: AAC Microtech Changzhou Co Ltd
Current assignee: AAC Microtech Changzhou Co Ltd
Priority date: 2023-09-04
Filing date: 2023-09-04
Publication date: 2024-05-14
Anticipated expiration: 2033-09-04

Abstract

The utility model provides a linear motor, which comprises a shell, and a vibrator assembly and an elastic support which are accommodated in the shell. The elastic support is divided into two sides of the vibration direction of the vibrator assembly, the vibrator assembly comprises a first fixing portion connected with the shell, a second fixing portion connected with the vibrator assembly and a connecting portion in the middle, a welding lug is arranged on the outer surface of the second fixing portion, the welding lug comprises two first side edges which are relatively arranged in parallel and extend along the vibration direction, and a second side edge and an arc edge which are connected with the two first side edges, and the arc edge is closer to the connecting portion relative to the second side edge and protrudes towards the direction away from the second side edge. The edge of the soldering lug in the linear motor is of an arc structure, so that the stress distribution of the spring bracket can be improved, and the service life of a product can be prolonged.

Description

Linear motor

[ Field of technology ]

The present utility model relates to linear motors, and more particularly, to a linear motor used in the field of mobile electronic devices.

[ Background Art ]

With the development of electronic technology, mobile electronic products are increasingly demanded, and linear motors are used for system vibration feedback, such as incoming call prompt, information prompt, vibration feedback of games and the like of mobile phones. Such wide application requires excellent performance and long service life of the vibration motor.

The linear motor of the related art comprises a shell, a vibrator, a stator and an elastic support, wherein the vibrator is accommodated in the shell, the vibrator comprises a mass block and a magnetic circuit system, and the elastic support and the mass block are fixed by welding lugs and used for supporting the vibrator to reciprocate. However, the related art tab is generally rectangular or chamfered, which causes stress concentration of the elastic support welded thereto at several vertices, easily resulting in fatigue and rapid loss of the elastic support.

Accordingly, there is a need to provide a new linear motor that solves the above-mentioned technical problems.

[ utility model ]

Based on the above problems, the utility model provides a linear motor capable of improving stress distribution of an elastic support and prolonging service life of a product.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

A linear motor comprises a shell with an accommodating space, a vibrator assembly accommodated in the shell and a pair of elastic supports fixed on the shell and arranged on two sides of the vibrator assembly in the vibration direction, wherein each elastic support comprises a first fixing part connected with the shell, a second fixing part connected with the vibrator assembly and a connecting part connected with the first fixing part and the second fixing part; the surface of second fixed part is equipped with the lug, the lug is including relative parallel arrangement and follow two first sides that vibration direction extends and connect two the second side and the circular arc limit of first side, the circular arc limit for the second side is close to more connecting portion, just the circular arc limit is to keeping away from the direction protrusion of second side.

Preferably, the second side is perpendicular to the vibration direction.

Preferably, the circular arc is symmetrical along the central axis of the second side.

Preferably, the first side edge and the second side edge are flush with the edge of the second fixing portion.

Preferably, the vibrator assembly comprises a mass block with an installation cavity and a magnetic circuit structure arranged in the installation cavity, wherein the mass block is provided with a fixing lug fixed with the second fixing part, and the shape of the fixing lug is consistent with that of the soldering lug.

Preferably, foam damping is arranged between the connecting part and the mass block.

Preferably, the casing includes upper cover and lower cover that sets up relatively, be fixed with on the lower cover and be used for driving the stator module of oscillator subassembly vibration and be used for restricting the stopper that the oscillator subassembly moved along the vibration direction.

The beneficial effects of the utility model are as follows:

This linear motor is with flexible support and vibrator subassembly fixed connection's lug includes relative parallel arrangement and follows two first sides that vibration direction extends and connects two the second side and the circular arc limit of first side, the circular arc limit for the second side is close to flexible support's connecting portion more, just the circular arc limit is to keeping away from the direction protrusion of second side, the stress distribution of flexible support can be improved in this circular arc limit's setting, reduces flexible support's loss, has improved flexible support's life-span.

[ Description of the drawings ]

For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the description below are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person having ordinary skill in the art of the present utility model, wherein:

Fig. 1 is a perspective view of a linear motor provided by the present utility model;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

Fig. 3 is an exploded perspective view of a linear motor according to the present utility model;

FIG. 4 is a perspective view of a flexible support and lug for a linear motor according to the present utility model;

fig. 5 is a perspective view of the linear motor provided by the utility model with the upper cover removed.

In the figure:

100. A linear motor; 1. a housing; 11. an upper cover; 12. a lower cover; 13. an accommodating space; 2. a vibrator assembly; 21. a mass block; 211. a mounting cavity; 212. a fixing bump; 22. a magnetic circuit structure; 221. magnetic steel; 222. a magnetic conductive plate; 3. an elastic support; 31. a first fixing portion; 32. a second fixing portion; 33. a connection part; 4. a stator assembly; 41. a coil; 42. an iron core; 43. a flexible circuit board; 5. a soldering lug; 51. a first side; 52. a second side; 53. arc edges; 6. damping foam; 7. a limiting block; x, vibration direction.

[ Detailed description ] of the invention

The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

As shown in fig. 1 to 5, the present utility model provides a linear motor 100 including a housing 1 having a receiving space 13, a vibrator assembly 2 received in the housing 1, a pair of elastic supports 3 fixed to the housing 1 and disposed symmetrically along both sides of a vibration direction X of the vibrator assembly 2, and a stator assembly 4 fixed to the housing 1 for driving the vibrator assembly 2 to vibrate.

The housing 1 includes an upper cover 11 and a lower cover 12 disposed opposite to each other, and the stator assembly 4 is fixed to the lower cover 12.

The vibrator assembly 2 comprises a mass block 21 with a mounting cavity 211 and a magnetic circuit structure 22 arranged in the mounting cavity 211, wherein the magnetic circuit structure 22 comprises a magnetic conduction plate 222 fixed on the mass block 21 and magnetic steel 221 fixed on the magnetic conduction plate 222, and the magnetic conduction plate 222 is used for converging magnetic force lines of the magnetic steel 221 so as to improve the magnetic field performance of the linear motor 100.

The elastic support 3 comprises a first fixing portion 31 connected with the shell 1, a second fixing portion 32 connected with the mass block 21, and a connecting portion 33 connecting the first fixing portion 31 and the second fixing portion 32, wherein a soldering lug 5 is arranged on the outer surface of the second fixing portion 33.

The stator assembly 4 includes an iron core 42 disposed corresponding to the magnetic steel 221, a coil 41 wound on the iron core 42, and a flexible circuit board 43 fixed on the lower cover 12 and electrically connected to the coil 41, where the coil 41 interacts with the magnetic steel 221 after being electrified, so that the elastic support 3 drives the mass block 21 to reciprocate along the vibration direction X, thereby providing a vibration sense.

As shown in fig. 4, the soldering lug 5 includes two first sides 51 disposed in parallel and extending along the vibration direction X, and a second side 52 and a circular arc 53 connecting the two first sides 51, the circular arc 53 is closer to the connecting portion 33 relative to the second side 52, the circular arc 53 protrudes away from the second side 52, the second side 52 is perpendicular to the vibration direction X, the circular arc 53 is symmetrical along the central axis of the second side 52, and the first side 51 and the second side 52 are flush with the edge of the second fixing portion 32.

Further, as shown in fig. 3, the mass 21 is provided with a fixing protrusion 211 fixed to the second fixing portion 32, and the shape of the fixing protrusion 211 is identical to the shape of the soldering lug 5, so as to ensure that the second fixing portion 33 of the elastic support 3 is uniformly stressed when being fixed to the mass 21.

Further, as shown in fig. 2, in order to prevent noise generated by collision between the connection portion 33 of the elastic support 3 and the mass 21 during vibration and improve vibration damping of the vibrator assembly 2, a foam damper 6 is disposed between the connection portion 33 and the mass 21.

Further, as shown in fig. 2 to 3, a stopper 7 for restricting the vibrator assembly 2 from moving along the vibration direction X is fixed to the lower cover 12 of the housing.

Compared with the related art, the welding lug of the linear motor is changed into an arc structure from a rectangular or chamfer structure, so that the stress distribution of the elastic support can be improved, the loss of the elastic support is reduced, and the service life of the elastic support is prolonged.

While the utility model has been described with respect to the above embodiments, it should be noted that modifications can be made by those skilled in the art without departing from the inventive concept, and these are all within the scope of the utility model.

Claims

1. A linear motor comprising a housing having an accommodation space, a vibrator assembly accommodated in the housing, and a pair of elastic brackets fixed to the housing and provided at both sides of the vibrator assembly in a vibration direction, wherein the elastic brackets include a first fixing portion connected to the housing, a second fixing portion connected to the vibrator assembly, and a connecting portion connecting the first fixing portion and the second fixing portion; the surface of second fixed part is equipped with the lug, the lug is including relative parallel arrangement and follow two first sides that vibration direction extends and connect two the second side and the circular arc limit of first side, the circular arc limit for the second side is closer to connecting portion just the circular arc limit is to keeping away from the direction protrusion of second side.

2. The linear motor of claim 1, wherein the second side is perpendicular to the vibration direction.

3. The linear motor of claim 2, wherein the circular arc is symmetrical about a central axis of the second side.

4. The linear motor of claim 1, wherein the first side and the second side are flush with an edge of the second stationary portion.

5. The linear motor of claim 1, wherein the vibrator assembly comprises a mass block having a mounting cavity and a magnetic circuit structure disposed in the mounting cavity, the mass block being provided with a fixing projection fixed to the second fixing portion, the fixing projection having a shape corresponding to that of the soldering lug.

6. The linear motor of claim 5, wherein foam damping is provided between the connection and the mass.

7. The linear motor of claim 1, wherein the housing comprises an upper cover and a lower cover disposed opposite to each other, and a stator assembly for driving the vibrator assembly to vibrate and a stopper for restricting movement of the vibrator assembly in the vibration direction are fixed to the lower cover.