WO2022067921A1

WO2022067921A1 - Linear motor and electronic device

Info

Publication number: WO2022067921A1
Application number: PCT/CN2020/123815
Authority: WO
Inventors: 邵焱; 华子旭; 浦晓峰; 汤赟
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: 2020-09-29
Filing date: 2020-10-27
Publication date: 2022-04-07
Also published as: CN213661417U

Abstract

A linear motor (10) and an electronic device (1). The linear motor comprises a drive assembly (300), a vibrator assembly (200), an elastic support member (400) for supporting the vibrator assembly (200), and a housing (100) having an accommodation space (111); the vibrator assembly (200) comprises a mass block (210) fixed to the elastic support member (400), and a magnetic steel group (220), the mass block (210) has an annular portion (211) and a bearing portion (212) that are integrally formed, the bearing portion (212) is connected to the annular portion (211) to define a mounting cavity (213) having an opening (2131) at one end, and the magnetic steel group (220) is provided in the mounting cavity (213); the drive assembly (300) is provided at the side close to the opening (2131), and is capable of generating a variable magnetic field for driving the magnetic steel group (220) to move, so as to drive the mass block (210) to make reciprocating motion with respect to the housing (100). Compared with conventional linear motors, by providing, on a mass block, a mounting cavity having an opening at one end, the linear motor can achieve the function of limiting a magnetic steel group even when a pole core is removed; in addition, the assembling process is simplified, and glue leakage is avoided.

Description

Linear Motors and Electronic Equipment

technical field

The present application relates to the technical field of motors, and in particular, to a linear motor and electronic equipment.

Background technique

With the development of technology, electronic devices on the market have gradually popularized linear motors to provide vibration sense for electronic devices instead of traditional rotor motors. The linear motor is driven by the electromagnetically driven mass block to reciprocate to generate vibration sensation. The magnetic steel group is set in the hole opened on the mass block, and is positioned by the pole core covered on the hole.

technical problem

During the assembly process of the existing linear motor, the pole core and the mass block need to be connected by welding or bonding, and then the magnetic steel group is placed in the hole position, the assembly process is complicated, and the production efficiency is affected; in addition, due to the mass block There is still a certain gap with the pole core after assembly. When glue is injected into the hole to fix the magnetic steel group, the glue is easy to overflow from the gap, and it is easy to contaminate other parts of the linear motor. Therefore, it is necessary to design a new type of linear motor to change the status quo.

technical solutions

In view of this, the present application provides a linear motor and an electronic device, which are used to solve the problems of complicated assembly process of the existing linear motor and easy leakage of glue during the assembly process.

The present application proposes a linear motor, which includes a drive assembly, a vibrator assembly, an elastic support member supporting the vibrator assembly, and a housing having an accommodating space, where the vibrator assembly is suspended in the accommodating space by the elastic support member inside, the drive assembly is at least partially disposed in the accommodating space and connected to the housing;

The vibrator assembly includes a mass block fixed with the elastic support member and a magnetic steel group, the mass block has an integrally formed annular portion and a bearing portion, the bearing portion is covered on one side of the annular portion to enclose An installation cavity with an opening at one end is formed, and the magnetic steel group is accommodated and fixed in the installation cavity; the drive assembly is fixed on the side of the casing close to the opening and is opposite and spaced from the magnetic steel group It is provided that the driving assembly interacts with the magnetic steel group to drive the mass block to vibrate back and forth relative to the housing.

In some embodiments of the present application, the bearing portion surrounds the magnetic steel group and is adapted to the magnetic steel group; the magnetic steel group includes a first magnetic steel and a second magnetic steel arranged along the vibration direction A magnetic steel, the orthographic projection of the second magnetic steel toward the first magnetic steel along the vibration direction of the mass block is at least partially located outside the first magnetic steel.

In some embodiments of the present application, the orthographic projection of the magnetic steel group on the bearing portion is a rectangle or a circle.

In some embodiments of the present application, a through hole communicated with the installation cavity is formed on the bearing portion.

In some embodiments of the present application, the number of the through holes is multiple, and a plurality of the through holes are arranged along the vibration direction and are spaced apart from each other.

In some embodiments of the present application, the drive assembly includes an electrical connector and a coil fixed on the electrical connector, the electrical connector is fixed on the housing and connected to an external power source, the coil It is directly opposite to and spaced apart from the magnetic steel group.

In some embodiments of the present application, the driving assembly includes two of the coils, and the two coils are arranged in sequence along the vibration direction.

In some embodiments of the present application, the elastic support has a fixed part, an intermediate part and a connecting part connected in sequence; along a direction perpendicular to the vibration direction of the mass, the fixed part and the connecting part They are respectively located on opposite sides of the mass block, the fixing portion is fixed on the casing, and the connecting portion is fixed on the mass block.

In some embodiments of the present application, a positioning groove is formed on the mass block, and the connecting portion is provided in the positioning groove.

In some embodiments of the present application, two elastic support members are provided, the number of the positioning grooves is two, and each elastic support member corresponds to one positioning groove, and two positioning grooves are provided. The slot is centrosymmetric with respect to the geometric center of the mass.

In some embodiments of the present application, the electrical connector is a flexible circuit board.

The present application also provides an electronic device, including the linear motor described in any one of the above.

beneficial effect

Implementing the embodiments of the present application has the following beneficial effects:

In the linear motor of this embodiment, the mass block is provided with an installation cavity with an opening at one end, and the magnetic steel group can be inserted into the installation cavity through the opening, and is limited by the bearing portion. Compared with the existing linear motor, the In the assembly process, the process of installing the fixed pole core can be omitted, and the assembly process can be simplified. At the same time, since the mass block is composed of an integrally formed annular part and a bearing part, it can also be avoided when the magnetic steel group is fixed by injecting glue into the installation cavity. Glue spilled. Compared with the traditional linear motor, the linear motor of this embodiment can also realize the function of limiting the position of the magnetic steel group, and simplify the Assembly process to avoid glue leakage.

Description of drawings

1 is a schematic diagram of an electronic device in an embodiment of the present application;

2 is a schematic diagram of a linear motor in an embodiment of the present application;

Fig. 3 is a sectional view along line A-A in Fig. 2;

Fig. 4 is the sectional view along B-B line in Fig. 3;

Fig. 5 is the exploded schematic diagram of the linear motor in the embodiment of the present application;

6 is a schematic structural diagram of a vibrator assembly in some embodiments of the present application;

7 is a schematic structural diagram of a vibrator assembly in some embodiments of the present application;

8 is a schematic diagram of a magnetic pole arrangement of a vibrator assembly in an embodiment of the present application;

In the picture:

1. Electronic equipment; 10. Linear motor;

100, shell; 110, upper shell; 111, accommodating space; 120, cover plate;

200, vibrator assembly; 210, mass block; 211, annular part; 212, bearing part; 2121, through hole; 213, installation cavity; 2131, opening; 2132, cavity body; 2133, installation slot; 214, counterweight part; 2141, positioning slot; 220, magnet steel group; 221, first magnet steel; 222, second magnet steel; 223, third magnet steel;

300, drive assembly; 310, electrical connector; 320, coil;

400, elastic support; 410, fixing part; 420, middle part; 430, connecting part;

20. Body.

Embodiments of the present invention

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

Referring to FIG. 1 , an embodiment of the present application provides an electronic device 1 , which includes a linear motor 10 and a body 20 , and the linear motor 10 is fixed in the body 20 . Referring specifically to FIGS. 2 to 4 , an embodiment of the present application provides a linear motor 10 , which includes a housing 100 having an accommodating space 111 , a vibrator assembly 200 , a driving assembly 300 , and an elastic support 400 . The elastic support 400 The vibrator assembly 200 is supported on the vibrator assembly 200 , and the vibrator assembly 200 is suspended in the accommodating space 111 , and the driving assembly 300 is at least partially disposed in the accommodating space 111 and connected to the housing 100 ; the vibrator assembly 200 includes a mass block fixed with the elastic support 400 210 and the magnetic steel group 220. The mass block 210 has an integrally formed annular portion 211 and a bearing portion 212. The bearing portion 212 is covered on one side of the annular portion 211 to enclose an installation cavity 213 with an opening 2131 at one end. 220 is accommodated and fixed in the installation cavity 213; the driving component 300 is fixed on the side of the casing 100 close to the opening 2131 and is opposite to the magnetic steel group 220 and arranged at intervals, and the driving component 300 interacts with the magnetic steel group 220 to drive the mass 210 opposite. The casing 100 vibrates back and forth.

In the linear motor 10 of the present embodiment, the mass block 210 is provided with an installation cavity 213 having an opening 2131 at one end, and the magnetic steel group 220 can be inserted into the installation cavity 213 from the opening 2131, and is limited by the bearing portion 212. Compared with the existing linear motor 10, the process of installing the fixed pole core can be omitted during the assembly process, and the assembly process can be simplified. When glue is injected into the 213 to fix the magnetic steel group 220, the glue can also be prevented from overflowing. Compared with the conventional linear motor 10, the linear motor 10 of the present embodiment is provided with a mounting cavity 213 having an opening 2131 at one end in mass, and the magnetic steel group 220 can also be limited on the premise that the pole core is not provided. function, while simplifying the assembly process and avoiding glue leakage.

In addition, with the elastic support member 400 provided, during the reciprocating vibration of the driving assembly 300, the elastic support member 400 generates elastic deformation to store elastic potential energy, thereby driving the mass block 210 to realize the reset function.

It should be noted here that, referring to FIGS. 2 to 8 , the X direction is defined as the vibration direction of the mass block 210 , the Y direction is defined as the direction perpendicular to the vibration direction of the mass block 210 , and the Z direction is defined as the opening 2131 facing the bearing direction of section 212.

Please refer to FIG. 2 , FIG. 3 and FIG. 5 , in one embodiment, the driving assembly 300 includes an electrical connector 310 and a coil 320 fixed on the electrical connector 310 , and the electrical connector 310 is fixed on the housing 100 and connected to For the external power supply, the coil 320 is directly opposite to and spaced apart from the magnetic steel group 220 .

Referring to the placement state shown in FIG. 3 , in this embodiment, the electrical connector 310 is fixed in the housing 100 and protrudes from the housing 100 , so that the electrical connector 310 can be connected to an external power source. The coil 320 is energized to form a variable magnetic field by passing current to the electrical connector 310 to drive the magnetic steel group 220 to drive the mass block 210 to reciprocate in the X direction, and the linear motor 10 generates vibration through the movement of the mass block 210 . feel.

Please refer to FIG. 3 and FIG. 5 , in one embodiment, the driving assembly 300 includes two coils 320 , and the two coils 320 are arranged in sequence along the vibration direction of the mass 210 . In other embodiments, the driving assembly 300 may also include at least three coils 320, and the plurality of coils 320 are arranged in sequence along the X direction. By arranging the plurality of coils 320, the magnetic steel group 220 can be provided with a more stable driving effect and / or to achieve multiple modes of vibration control.

Specifically, the electrical connector 310 can be fixedly connected to the housing 100 by means of bonding, welding, etc., and the coil 320 is welded to the electrical connector 310 to achieve electrical communication. In other embodiments, the electrical connector 310 is connected to the coil 320 by welding. It can also be connected through contacts, so that the electrical connector 310 and the coil 320 can be easily disassembled and assembled.

In one embodiment, the electrical connector 310 is a flexible circuit board. The flexible circuit board has good flexibility, and at the same time, the thickness is small, and when the linear motor 10 is applied to the electronic device 1 , the installation and arrangement of the linear motor 10 can be facilitated. In other embodiments, the electrical connector 310 can also be a printed circuit board, so that the electrical connector 310 can have higher strength.

Referring to FIG. 4 , in one embodiment, the elastic support member 400 has a fixed portion 410 , an intermediate portion 420 and a connecting portion 430 connected in sequence; along the direction perpendicular to the vibration direction, the fixed portion 410 and the connecting portion 430 are respectively Located on opposite sides of the mass block 210 , the fixing portion 410 is fixed on the housing 100 , and the connecting portion 430 is fixed on the mass block 210 .

It can be understood that, in this embodiment, the elastic support member 400 is roughly in the shape of a “Zhong”, and the elastic support member 400 surrounds the end of the mass 210 . Therefore, the elastic support member 400 has the premise of elastic driving effect. Therefore, the vibrator assembly 200 can have a more compact structure, so as to reduce the dimensions of the housing 100 in the X direction and the Y direction, so as to facilitate the installation and arrangement of the linear motor 10 in the body 20 . In this embodiment, the elastic support 400 is an elastic sheet. In other embodiments, the elastic support 400 may also be a coil spring, and is disposed at the end of the mass block 210 in the vibration direction, so as to realize the reset function.

Further, a positioning groove 2141 is formed on the mass block 210 , and the connecting portion 430 is disposed in the positioning groove 2141 . By arranging the connecting portion 430 of the elastic support member 400 in the positioning groove 2141 of the mass block 210 , as shown in FIG. 4 , the upper surface of the connecting portion 430 is located below the upper surface of the mass block 210 . The connecting portion 430 is prevented from occupying the inner space of the housing 100 in the Y direction, and the size of the housing 100 in the Y direction does not need to be enlarged, so that the linear motor 10 as a whole has a small and compact structure.

Further, two elastic support members 400 are provided, the number of positioning grooves 2141 is two, and each elastic support member 400 corresponds to one positioning groove 2141 , and the two positioning grooves 2141 are centered relative to the geometric center of the mass block 210 . symmetry.

In this way, through the cooperation between the two sets of positioning grooves 2141 and the elastic support members 400, the two elastic support members 400 can balance the force of the mass block 210 in the Y direction, so that the mass block 210 tends to be in a balanced state as a whole, Further, the vibration stability of the linear motor 10 is improved, and the use effect is good.

Referring to FIG. 6 , in one embodiment, the bearing portion 212 surrounds the magnetic steel group 220 and fits with the magnetic steel group 220 ; the magnetic steel group 220 includes a first magnetic steel 221 and a second magnetic steel arranged along the vibration direction 222 , the orthographic projection of the second magnetic steel 222 toward the first magnetic steel 221 along the vibration direction is at least partially located outside the first magnetic steel 221 .

In this way, a stepped positioning structure can be formed between the cavity body 2132 and the installation groove 2133 , and the magnetic steel group 220 is provided with a convex structure adapted to the installation groove 2133 , so that the mass block 210 has a “fool-proof” Function, the magnetic steel group 220 can be conveniently installed and positioned through the installation slot 2133, the assembly efficiency of the vibrator assembly 200 is improved, and the assembly efficiency of the linear motor 10 is also improved.

Specifically, in this embodiment, the magnetic steel group 220 includes a first magnetic steel 221 , a second magnetic steel 222 and a third magnetic steel 223 arranged in sequence along the X direction, and in the Y direction, the first magnetic steel 221 has The width dimension is equal to the width dimension of the third magnetic steel 223 , the width dimension of the second magnetic steel 222 is larger than that of the first magnetic steel 221 , and is matched with the installation slot 2133 .

In this way, when the magnetic steel group 220 of this embodiment is assembled, the installation groove 2133 can position the second magnetic steel 222 , and then the first magnetic steel 221 and the second magnetic steel 222 can be installed on opposite sides of the second magnetic steel 222 . The third magnet 223 is easy to install. Specifically, the second magnetic steel 222 may be set as a single magnetic steel or a combination of multiple magnetic steels according to the design requirements of the linear motor 10 .

It should be noted that, in this embodiment, the width direction of the installation groove 2133 is in the same direction as the Y direction. In other embodiments, the width direction of the installation groove 2133 may also be in the same direction as the Z direction, so that the cavity body 2132 With the installation groove 2133, a sawtooth structure extending along the X direction and changing in height in the Z direction can be formed. In this embodiment, the height dimension of the corresponding second magnetic steel 222 in the Z direction is the same as that of the first magnetic steel. The height dimensions of the 221 are not the same.

Referring to FIG. 7 , in one embodiment, a through hole 2121 communicating with the mounting cavity 213 is formed on the bearing portion 212 . By opening the through hole 2121 on the bearing portion 212 , the weight reduction function of the bearing portion 212 can be realized, and the strength of the mass block 210 can also be improved, and the exhaust function can also be realized in the process of assembling the magnetic steel group 220 .

Further, the number of the through holes 2121 is multiple, and the multiple through holes 2121 are arranged in sequence along the vibration direction of the mass block 210 . Referring to FIG. 7 , in this embodiment, there are three through holes 2121 , and the through holes 2121 are evenly and spaced apart along the X direction. In other embodiments, the through holes 2121 can also be set to two or three above.

In some embodiments, the orthographic projection of the magnetic steel group 220 on the bearing portion 212 is a rectangle or a circle. By setting the mounting cavity 213 in the shape corresponding to the magnetic steel group 220 , the magnetic steel group 220 of the corresponding structure can be adapted.

In one embodiment, the second magnetic steel 222 includes three single magnetic steels, the three single magnetic steels are arranged in sequence along the X direction, the two single magnetic steels located at the ends are symmetrically arranged, and the magnetic pole directions are also symmetrical to each other. , the two single magnets located at both ends are S poles on one side close to the single magnet in the middle, the upper side of the single magnet located in the middle is S pole, and the lower side is N pole. The upper and lower sides of the first magnetic steel 221 and the third magnetic steel 223 are the S pole and the N pole, respectively. The first magnetic steel 221 and the third magnetic steel 223 are symmetrically arranged on opposite sides of the second magnetic steel 222 along the X direction. side. It can be understood that, in other embodiments, the magnetic pole direction of each magnetic steel can be adjusted according to actual requirements, which is not limited here.

Referring specifically to FIG. 4 , in one embodiment, the casing 100 includes an upper casing 110 and a cover plate 120 . The cover plate 120 is covered on the upper casing 110 and is enclosed with the upper casing 110 to form a receiving space 111 . The vibrator assembly The driving assembly 300 is at least partially fixed on the cover plate 120 . In other embodiments, the driving assembly 300 may also be fixed in the upper casing 110, which is not limited herein.

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 linear motor, characterized in that it includes a drive assembly, a vibrator assembly, an elastic support member for supporting the vibrator assembly, and a housing with an accommodating space, and the vibrator assembly is suspended in the accommodating space by the elastic support member In the space, the drive assembly is at least partially disposed in the accommodating space and connected to the housing;

The vibrator assembly includes a mass block fixed with the elastic support member and a magnetic steel group, the mass block has an integrally formed annular portion and a bearing portion, the bearing portion is covered on one side of the annular portion to enclose An installation cavity with an opening at one end is formed, and the magnetic steel group is accommodated and fixed in the installation cavity; the drive assembly is fixed on the side of the casing close to the opening and is opposite and spaced from the magnetic steel group It is provided that the driving assembly interacts with the magnetic steel group to drive the mass block to vibrate back and forth relative to the housing.
The linear motor according to claim 1, wherein the bearing portion surrounds the magnetic steel group and is adapted to the magnetic steel group; the magnetic steel group comprises first A magnetic steel and a second magnetic steel, wherein the orthographic projection of the second magnetic steel toward the first magnetic steel along the vibration direction of the mass block is at least partially located outside the first magnetic steel.
The linear motor according to claim 1, wherein the orthographic projection of the magnetic steel group on the bearing portion is a rectangle or a circle.
The linear motor according to claim 1, wherein a through hole communicated with the installation cavity is formed on the bearing portion.
The linear motor according to claim 4, wherein the number of the through holes is plural, and the plurality of the through holes are arranged along the vibration direction and are spaced apart from each other.
The linear motor according to claim 1, wherein the drive assembly comprises an electrical connector and a coil fixed on the electrical connector, and the electrical connector is fixed on the housing and connected to the outside A power supply, the coil and the magnetic steel group are directly opposite and spaced apart.
The linear motor according to claim 6, wherein the driving assembly comprises two coils, and the two coils are arranged in sequence along the vibration direction.
The linear motor according to claim 7, wherein the elastic support has a fixed part, an intermediate part and a connecting part connected in sequence; along a direction perpendicular to the vibration direction of the mass, the fixed part and the connecting parts are respectively located on opposite sides of the mass block, the fixing part is fixed on the casing, and the connecting part is fixed on the mass block.
The linear motor according to claim 8, wherein a positioning groove is formed on the mass block, and the connecting portion is arranged in the positioning groove.
The linear motor according to claim 9, wherein there are two elastic support members, the number of the positioning grooves is two, and each of the elastic support members corresponds to one positioning groove, The two positioning grooves are centrally symmetric with respect to the geometric center of the mass.
The linear motor according to claim 6, wherein the electrical connector is a flexible circuit board.
An electronic device, characterized by comprising the linear motor according to any one of claims 1-11.