WO2022143039A1

WO2022143039A1 - Linear motor

Info

Publication number: WO2022143039A1
Application number: PCT/CN2021/136091
Authority: WO
Inventors: 张雨晴; 董宇航
Original assignee: 歌尔股份有限公司
Priority date: 2020-12-30
Filing date: 2021-12-07
Publication date: 2022-07-07
Also published as: CN213846505U

Abstract

A linear motor. The linear motor comprises a housing (1), a vibrator assembly (2), a stator assembly (3) and a copper support (4), wherein the stator assembly (3) is fixed on the housing (1) and is arranged parallel to the vibrator assembly (2); the vibrator assembly (2) is positioned in a coil (31) of the stator assembly (3); the copper support (4) is connected to the housing (1); the coil (31) is wound on the copper support (4); and the copper support (4) is spaced apart from the vibrator assembly (2). In the technical solution, the copper support (4) is arranged between the vibrator assembly (2) and the stator assembly (3), and the copper support (4) is in contact with the coil (31), thus protecting the coil (31) and preventing the vibrator assembly (2) from impacting and damaging the coil (31). In addition, the copper support (4) is arranged between the vibrator assembly (2) and the stator assembly (3), thereby achieving an electromagnetic damping effect so as to reduce a magnetic gap of a magnetic circuit structure of the linear motor and improve the utilization rate of a magnetic field.

Description

Linear motor

technical field

The utility model relates to the field of transmission devices, in particular to a linear motor.

Background technique

With the development and application of haptic feedback in electronic products, linear motors are more and more diverse in structure and function as the actuator for haptic feedback. In different linear motor structures, the drop test requires that the vibrator part does not damage the coil under the specified drop conditions; and a magnetic circuit structure with high magnetic field utilization, the magnetic gap must be controlled within a small range.

Therefore, how to protect the coil and improve the utilization of the magnetic field needs to be considered in the design.

Utility model content

The main purpose of the utility model is to provide a linear motor, which aims to prevent the vibrator from causing impact damage to the coil and to improve the utilization rate of the magnetic field.

In order to achieve the above purpose, the utility model proposes a linear motor, comprising:

shell;

a stator assembly, the stator assembly being fixed on the casing;

a vibrator assembly, the vibrator assembly is arranged in parallel with the stator assembly, and the vibrator assembly is located in the coil of the stator assembly;

A copper support, the copper support is connected to the casing, the coil is wound on the copper support, and the copper support is spaced from the vibrator assembly.

In an optional embodiment, the copper support includes:

a connecting part, the coil is wound on the connecting part;

The limiting portion protruding on the bottom end or the outer edge of the top end of the connecting portion is used for limiting the end portion of the coil.

In an optional embodiment, the connection between the connecting portion and the limiting portion is arranged in an arc shape.

In an optional embodiment, the inner diameter of the coil is larger than the outer diameter of the connecting portion.

In an optional embodiment, the vibrator assembly includes a permanent magnet, and the permanent magnet is spaced apart from the coil to form a vibration gap.

In an optional embodiment, the vibrator assembly further includes:

The inner spacer, the injection molded part and the gasket are arranged on the permanent magnet in sequence, the end of the injection molded part facing away from the inner spacer is provided with an installation groove, and the gasket is installed in the installation groove.

In an optional embodiment, the stator assembly further includes:

The outer washer is fixed on the inner wall of the casing and is spaced apart from the coil.

In an optional embodiment, the end of the injection molded part facing away from the Nevada is further provided with a connecting block, and the stator assembly further includes:

An elastic connecting piece, the elastic connecting piece has a connecting end and a fixed end, the connecting end is connected to the connecting block, and the fixed end is connected to the outer washer and the casing.

In an optional embodiment, the elastic connecting member is an elastic sheet.

In an optional embodiment, the shape of the copper support is annular.

The utility model provides a linear motor, the linear motor comprises a casing, a vibrator assembly, a stator assembly and a copper bracket, the stator assembly is fixed on the casing and is arranged in parallel with the vibrator assembly, and the vibrator assembly is located in the In the coil of the stator assembly, the copper bracket is connected to the housing, and the coil is wound on the copper bracket, and the copper bracket is spaced from the vibrator assembly. That is, in the technical solution provided by the present invention, the copper bracket is arranged between the vibrator assembly and the stator assembly, and the copper bracket is in contact with the coil, so as to protect the coil and prevent the The vibrator assembly causes impact damage to the coil; and the copper bracket is arranged between the vibrator assembly and the stator assembly, which can play an electromagnetic damping effect to reduce the magnetic field of the magnetic circuit structure of the linear motor. gap, thereby improving the utilization of the magnetic field.

Description of drawings

In order to illustrate the technical solutions in the embodiments or exemplary embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that are used in the embodiments or exemplary descriptions. Obviously, the accompanying drawings in the following description are only For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained according to the drawings without creative efforts.

1 is a schematic structural diagram of a linear motor according to an embodiment of the present invention;

FIG. 2 is a schematic exploded view of the structure of the linear motor according to the embodiment of the present invention;

3 is a schematic cross-sectional view of a linear motor according to an embodiment of the present invention

4 is a schematic structural diagram of a copper support according to an embodiment of the present invention.

The realization, functional characteristics and advantages of the purpose of the present utility model will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The technical solutions in the embodiments 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. Obviously, the described embodiments are only a part of the embodiments of the present utility model, but not all of them. Example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the difference between the various components under a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly.

In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection required by the present utility model.

The utility model provides a linear motor.

The utility model is mainly used for the improvement of the miniature linear motor, but it does not exclude the application of the technology in the utility model to the large linear motor. However, for the sake of expression, in the following description of the embodiments, "linear motor" and "mini linear motor" have the same meaning.

In order to describe the structure of the linear motor of the present invention in detail, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In order to solve the problem that the vibrator part of the existing linear motor is under the specified drop condition in the drop test, the coil may be damaged, and the magnetic gap of the magnetic circuit structure of the linear motor is relatively large. A copper bracket is set on one side to prevent the vibrator from causing impact damage to the coil during the drop test of the linear motor, so as to protect the coil; on the other hand, the copper material of the copper bracket itself can play an electromagnetic role in the linear motor structure. The damping effect can reduce the magnetic gap of the magnetic circuit structure of the linear motor, thereby improving the utilization rate of the magnetic field.

In addition, the copper bracket can be used as a base for attaching and assembling the coil to fix the coil and further protect the coil from being damaged.

As shown in FIGS. 1-3 , the linear motor includes a casing 1, a vibrator assembly 2, a stator assembly 3 and a copper bracket 4, the stator assembly 3 is fixed on the casing 1 and is arranged in parallel with the vibrator assembly 2, The vibrator assembly 2 is located in the coil 31 of the stator assembly 3 , the copper bracket 4 is connected to the housing 1 , and the coil 31 is wound on the copper bracket 4 , and the copper bracket 4 is connected to the outer casing 1 . The oscillator components 2 are arranged at intervals. That is, in the technical solution provided by the present invention, the copper bracket 4 is arranged between the vibrator assembly 2 and the stator assembly 3 , and the copper bracket 4 is in contact with the coil 31 , so that the coil 31 is connected to the coil 31 . Protected to prevent the vibrator assembly 2 from causing impact damage to the coil 31; and the copper bracket 4 is arranged between the vibrator assembly 2 and the stator assembly 3, which can play an electromagnetic damping effect, so as to prevent damage to the coil 31. The magnetic gap of the magnetic circuit structure of the linear motor is reduced, thereby improving the utilization rate of the magnetic field.

In this embodiment, the vibrator assembly 2 is a vibrating element of the linear motor, and is located in the coil 31 to achieve the effect of vibration in the coil.

Specifically, the vibrator assembly 2 includes a permanent magnet 21 , a Nevada 22 arranged on the permanent magnet 21 in sequence, an injection molded part 23 and a gasket 24 , wherein the permanent magnet 21 and the coil 31 are arranged at intervals , to form a vibration gap A; an installation groove (not shown) is provided at one end of the injection molded part 23 away from the Nevada 22 , and the gasket 24 is installed in the installation groove.

It can be understood that the vibrator assembly 2 of the linear motor is not improved in this embodiment, that is, the vibrator assembly 2 can refer to the structure and principle of the vibrator of the exemplary linear motor, and will not be described in this embodiment. Repeat.

Further, since the coil 31 will vibrate with the vibration of the vibrator group 2 , and in this embodiment, the stator assembly further includes an outer washer 32 , and the outer washer 32 is fixed on the housing 1 . At this time, in order to prevent the outer washer 32 from vibrating with the coil 31, in this embodiment, the outer washer 32 and the coil 31 are spaced apart to form a gap B to prevent the outer washer 32 from vibrating with the coil 31. The division 32 vibrates with the housing 1 . The functions and principles of the outer washer 32 and the coil 31 are the same as those of the outer washer and the coil provided in the exemplary linear motor, and will not be repeated in this embodiment.

Further, in order to realize the connection between the vibrator assembly 2 and the stator assembly 3, the stator assembly 3 further includes an elastic connecting piece 33, and the elastic connecting piece 33 has a connecting end 331 and a fixing end 332. A connecting block 231 is also provided at one end of the injection molded part 23 away from the inner washer 22 , the connecting end 331 is connected to the connecting block 231 , and the fixed end 332 is connected to the outer washer 32 and the outer casing 1, so that the vibrator assembly 2 is connected with the stator assembly 3.

Optionally, the elastic connecting member 33 is an elastic piece. Alternatively, in other embodiments, the elastic connecting member 33 may also be other elastic connecting structures, which are not limited herein.

Further, as shown in FIGS. 2 and 3 , the copper bracket 4 includes a connecting portion 41 and a limiting portion 42 protruding from the bottom end or the outer edge of the top end of the connecting portion 41 , and the coil 31 is wound around the connecting portion 41 . On the connecting portion 41 , and one end of the coil 31 abuts on the limiting portion 42 , so that the end portion of the coil 31 is limited by the limiting portion 42 . For example, when the coil 31 is wound on the connecting portion 41 , the winding position of the coil 31 may be limited by the limiting portion 42 .

That is to say, the bottom end or the outer edge of the top end of the connecting portion 41 is only for the convenience of describing the embodiment of the present invention, and does not limit the position of the limiting portion 42, which is used to connect the coil 31 in the The position of the part 41 is limited to prevent the coil 31 from not being completely wound around the connection part 41 or beyond the connection part 41, resulting in unstable connection to the coil 31, thereby affecting the connection of the coil 31. Describe the performance of linear motors.

Since the linear motor in this embodiment has a symmetrical structure up and down, that is, the vibrator assembly 2 is provided with two sets of the permanent magnets 21, the inner part 22, the injection molded part 23 and the spacer 24, and the stator assembly 3 is also provided There are two upper and lower sets of the coils 31 , the external washer 32 and the elastic connector 33 . At this time, the number of the copper brackets 4 is two groups. Between the stator assemblies 3 and in contact with the coil 31 above, another copper bracket 4 is arranged between the vibrator assembly 2 and the stator assembly 3 below and in contact with the coil 31 below .

Further, in order to facilitate the setting of the coil 31 in the connecting portion 41, the inner diameter of the coil 31 is larger than the outer diameter of the connecting portion 41 in this embodiment, so as to facilitate the connection between the coil 31 and the connecting portion 41. The connection between the connection parts 41 .

Further, the connecting portion 41 and the limiting portion 42 are integral structures, that is, in order to enable the limiting portion 42 to smoothly transition to the connecting portion 41 , the connecting portion 41 and the limiting portion The connection between 42 is arranged in an arc shape.

Of course, in this embodiment, in order to enable the copper bracket 4 to better fix the coil 31 , the inner wall of the coil 31 abuts on the outer wall of the connecting portion 41 to make the coil 31 tightly The ground is clamped on the copper bracket 4 to prevent the coil 31 from falling off during the vibration process.

Based on the linear motor described above, the coil 31 is a ring structure, that is, the shape of the copper bracket 4 is a ring. In other embodiments, the coil 31 may be of other structures, that is, the copper support 4 is configured to match the structure of the coil 31, so that the coil 31 can be sleeved on the copper support 4, Thus, the copper bracket 4 can support and fix the coil 31 .

Further, when the coil 31 is a ring structure, the copper support 4 can also be other structures than the ring. For example, the copper support 4 can be a part of the ring, that is, a part of the ring is cut out, as long as it can The coil 31 can be sleeved on the copper bracket 4 to protect the coil 31 , support the coil 31 , provide electromagnetic damping, and prevent the coil 31 from being damaged by falling, which is not limited herein.

Further, the structures of the vibrator assembly 2 and the stator assembly 3 are not limited to the forms shown in the drawings, and the structures shown in FIGS. 1 to 3 of this embodiment are not the basic elements of the linear motor of this embodiment. The only structural representation of the components is to set a copper bracket 4 on the coil 31 to realize the functions of protecting the coil 31, supporting the coil 31, providing electromagnetic damping, and preventing the coil 31 from being damaged by falling.

In the technical solution provided by the present invention, the linear motor includes a casing 1 , a vibrator assembly 2 , a stator assembly 3 and a copper bracket 4 , and the stator assembly 3 is fixed on the casing 1 and is arranged in parallel with the vibrator assembly 2 , the vibrator assembly 2 is located in the coil 31 of the stator assembly 3, the copper bracket 4 is connected to the casing 1, and the coil 31 is wound on the copper bracket 4, and the copper bracket 4 is connected with The vibrator assemblies 2 are arranged at intervals. That is, in the technical solution provided by the present invention, the copper bracket 4 is arranged between the vibrator assembly 2 and the stator assembly 3 , and the copper bracket 4 is in contact with the coil 31 , so that the coil 31 is connected to the coil 31 . Protected to prevent the vibrator assembly 2 from causing impact damage to the coil 31; and the copper bracket 4 is arranged between the vibrator assembly 2 and the stator assembly 3, which can play an electromagnetic damping effect, so as to prevent damage to the coil 31. The magnetic gap of the magnetic circuit structure of the linear motor is reduced, thereby improving the utilization rate of the magnetic field.

The above are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Under the conception of the present invention, any equivalent transformations made by using the contents of the description and drawings of the present invention, or directly / Indirect applications in other related technical fields are included in the scope of patent protection of the present utility model.

Claims

A linear motor, characterized in that it includes:

shell;

a stator assembly, the stator assembly being fixed on the casing;

a vibrator assembly, the vibrator assembly is arranged in parallel with the stator assembly, and the vibrator assembly is located in the coil of the stator assembly;

A copper support, the copper support is connected to the casing, the coil is wound on the copper support, and the copper support is spaced from the vibrator assembly.
The linear motor of claim 1, wherein the copper bracket comprises:

a connecting part, the coil is wound on the connecting part;

The limiting portion protruding on the bottom end or the outer edge of the top end of the connecting portion is used for limiting the end portion of the coil.
The linear motor according to claim 2, wherein the connection between the connecting portion and the limiting portion is arranged in an arc shape.
The linear motor of claim 3, wherein the inner diameter of the coil is larger than the outer diameter of the connecting portion.
The linear motor of claim 1, wherein the vibrator assembly comprises a permanent magnet, and the permanent magnet is spaced apart from the coil to form a vibration gap.
The linear motor according to claim 5, wherein the vibrator assembly further comprises:

The inner spacer, the injection molded part and the gasket are arranged on the permanent magnet in sequence, the end of the injection molded part facing away from the inner spacer is provided with an installation groove, and the gasket is installed in the installation groove.
The linear motor of claim 6, wherein the stator assembly further comprises:

The outer washer is fixed on the inner wall of the casing and is spaced apart from the coil.
The linear motor according to claim 7, wherein a connecting block is further provided at the end of the injection molded part away from the Nevada, and the stator assembly further comprises:

An elastic connecting piece, the elastic connecting piece has a connecting end and a fixed end, the connecting end is connected to the connecting block, and the fixed end is connected to the outer washer and the casing.
The linear motor according to claim 8, wherein the elastic connecting member is an elastic sheet.
The linear motor according to any one of claims 1 to 9, wherein the shape of the copper bracket is annular.