WO2021082127A1

WO2021082127A1 - Linear vibration electric motor

Info

Publication number: WO2021082127A1
Application number: PCT/CN2019/120472
Authority: WO
Inventors: 凌芳华; 浦晓峰; 王俊生; 陶锋
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: 2019-10-28
Filing date: 2019-11-25
Publication date: 2021-05-06
Also published as: CN211321180U

Abstract

Provided is a linear vibration electric motor, comprising a base (1) with an accommodating space (10), a vibration unit (2), an elastic assembly (3) fixed to the base (1) and suspending the vibration unit (2) in the accommodating space (10), a coil unit fixed to the base (1) to drive the vibration unit (2) to vibrate, and a good conductor (4) fixed to the base (1). The vibration unit (2) comprises a magnetic steel unit (21) which interacts with the coil unit to provide a driving force. The good conductor (4) is fixed on the base (1), the good conductor and the vibration unit (2) are arranged at an interval, and the good conductor (4) is located in a magnetic field of the magnetic steel unit (21) so as to generate a damping force which hinders the movement of the vibration unit (2). Compared with the prior art, the linear vibration electric motor has a better vibration performance and higher reliability.

Description

Linear vibration motor

Technical field

The utility model relates to a motor, in particular to a linear vibration motor used in the field of mobile electronic products.

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 linear vibration motors for system feedback , Such as mobile phone call reminder, information reminder, navigation reminder, vibration feedback of game console, etc. Such a wide range of applications requires the vibration motor to have excellent performance and long service life.

The related art linear vibration motor includes a base having a housing space, a vibration unit, an elastic component fixed to the base and suspending the vibration unit in the housing space, and a base fixed to the base to drive the The coil unit vibrated by the vibrating unit interacts with the magnetic field generated by the vibrating unit through the electric field generated by the coil unit, thereby driving the vibrating unit to make a reciprocating linear motion to generate vibration.

technical problem

However, in the related art linear vibration motor, because the vibration unit is damped by the vibration unit during the vibration process, the stability of the vibration unit is affected. In the related art, the vibration unit is adjusted by adding magnetic fluid or damping foam. Damping, but due to the poor temperature characteristics of magnetic fluid or foam, the reliability of adjusting the damping of the vibration unit is not high.

Therefore, it is necessary to provide a new linear vibration motor to solve the above-mentioned problems.

Technical solutions

The technical problem to be solved by the utility model is to provide a linear vibration motor with good vibration performance and reliability.

In order to solve the above technical problems, the present invention provides a linear vibration motor, which includes a base with an accommodation space, a vibration unit, and an elastic component fixed to the base and suspended in the accommodation space. , A coil unit fixed to the base to drive the vibration unit to vibrate and a good conductor fixed to the base; the vibration unit includes a magnetic steel unit that interacts with the coil unit to provide a driving force, so The linear vibration motor further includes a good conductor fixed to the base and spaced apart from the vibration unit, and the good conductor is located in the magnetic field of the magnetic steel unit to generate a damping force that hinders the movement of the vibration unit.

Preferably, the magnetic steel unit includes a main magnetic steel and a soft magnetic block attached to the magnetic pole of the main magnetic steel.

Preferably, the good conductors are respectively arranged on opposite sides of the vibration unit along a vibration direction perpendicular to the vibration unit.

Preferably, the magnetic steel unit further includes a secondary magnetic steel, and the secondary magnetic steel is attached to a side of the soft magnetic block away from the main magnetic steel along the vibration direction.

Preferably, the soft magnetic blocks include two and are respectively located on opposite sides of the main magnet, and the auxiliary magnet includes two and are respectively located on the two soft magnetic blocks away from the main magnet. On the side.

Preferably, the magnetization directions of the main magnet and the auxiliary magnet are both parallel to the vibration direction, and the magnetization directions of the main magnet and the auxiliary magnet are opposite.

Preferably, the elastic components include two groups, and are respectively fixed on opposite sides of the vibration unit along the vibration direction.

Preferably, the vibration unit further includes a mass block, the magnetic steel unit is embedded and fixed in the mass block, and the elastic component is fixed to the mass block.

Preferably, each of the elastic components sequentially includes a first fixed arm, a first elastic arm extending from the first fixed arm, a second elastic arm extending in the opposite direction from the first elastic arm, and a second elastic arm extending from the first elastic arm. A second fixed arm extending from two elastic arms; the first fixed arm is fixed to the vibration unit, and the second fixed arm is fixed to the base.

Preferably, the good conductor is a copper sheet.

Beneficial effect

Compared with the related art, the linear vibration motor of the present invention is provided with good conductors in the base, and the good conductors are respectively arranged on opposite sides of the vibration unit along the vibration direction perpendicular to the vibration unit, and It is arranged spaced apart from the vibration unit. The good conductor is stationary because it is fixed on the base. When the vibrating unit reciprocates in the direction of vibration, the magnetic field emitted by the soft magnetic block moves with the movement of the vibrating unit, which makes the magnetic field intensity of a certain point of the good conductor continuously change, which is equivalent to A good conductor cuts the magnetic field emitted by the soft magnetic block, thereby generating an induced electromotive force, and the induced electromotive force hinders the movement of the good conductor, that is, the phenomenon of electromagnetic damping, thereby generating an interaction force that hinders the movement of the vibrating unit, and achieves the effect of adjusting the vibration characteristics of the vibrating unit. The faster the unit moves, the greater the induced electromotive force and the better the damping characteristics, which makes the linear vibration motor's vibration performance better. At the same time, the electromagnetic damping formed by the above structure is less affected by temperature, which makes the stability of adjusting the vibration characteristics higher.

Description of the drawings

Figure 1 is a schematic diagram of the three-dimensional structure of the linear vibration motor of the utility model;

Figure 2 is an exploded schematic diagram of part of the three-dimensional structure of the linear vibration motor of the utility model;

Figure 3 is a front view of a part of the three-dimensional structure of the linear vibration motor of the utility model;

Figure 4 is a schematic diagram of the relationship between the magnetic pole setting of the magnetic steel unit and the good conductor in the linear vibration motor of the utility model.

Embodiments of the present invention

The utility model will be further described below in conjunction with the drawings and the embodiments.

Please refer to FIGS. 1-3 at the same time. The present invention provides a linear vibration motor 100, which includes a base 1, a vibration unit 2, an elastic component 3, a good conductor 4, a reinforcement block 5, and a limit block 6.

The base 1 has a receiving space 10, which includes a bottom cover 11 and an upper cover 12 covering the bottom cover and forming the receiving space 10 together.

The vibration unit 2 includes a magnetic steel unit 21 and a mass 22.

The coil unit of the magnetic steel unit 21 interacts to provide a driving force, and includes a main magnetic steel 211, a soft magnetic block 212 and a secondary magnetic steel 213.

The soft magnetic block 212 is attached to the magnetic pole of the main magnet 21. Specifically, the soft magnetic block 212 is attached to one side of the main magnet 21 along the vibration direction. More preferably, in this embodiment, there are two soft magnetic blocks 212, and the two soft magnetic blocks 212 are respectively attached to opposite sides of the main magnetic steel 21 along the vibration direction, and the stability of the symmetrical structure is better.

In order to further increase the magnetic field and make the vibration performance of the vibrating unit 2 better, the magnet unit 21 is also provided with a secondary magnet 213. The auxiliary magnet 213 is attached to the side of the soft magnetic block 212 away from the main magnet 211 along the vibration direction. In this embodiment, there are two secondary magnets 213, which are respectively located on the side of the two soft magnetic blocks 212 away from the main magnet 211 to form a symmetrical structure and improve stability.

The mass 22 is used as a counterweight to increase the weight of the vibration unit 2 to achieve the purpose of increasing the vibration amplitude of the vibration unit 2 and improving the vibration performance. In this embodiment, the magnetic steel unit 21 is embedded and fixed in the mass 22.

The elastic component 3 suspends the vibration unit 2 in the receiving space 10.

One end of the elastic component 3 is fixed to the vibration unit 2, in this embodiment, it is specifically fixed to the mass 22; the other end of the elastic component 3 is fixed to the base 1, such as the bottom cover 11, for The vibration of the vibration unit 2 in the horizontal vibration direction provides restoring force.

In this embodiment, the elastic component 3 includes two groups, which are respectively located on opposite sides of the vibration unit 22 along the vibration direction thereof.

Specifically, the elastic component 3 has a V-shaped elastic sheet structure. The elastic component 3 includes a first fixed arm 31, a first elastic arm 32 extending from the first fixed arm 31, and a first elastic arm 32 extending from the first fixed arm 31. The second elastic arm 33 extending in the opposite direction from the elastic arm 32 and the second fixed arm 34 extending from the second elastic arm 33.

The first fixed arm 31 is fixed to the vibration unit 2, and the second fixed arm 34 is fixed to the base 1, specifically to the bottom cover 11 of the base 1.

In this embodiment, in order to increase the stability and symmetry of the restoring force provided by the elastic component 3, the first elastic arm 32 and the second elastic arm 33 of one of the two elastic components 3 are surrounded by The formed opening is opposite to the opening surrounded by the first elastic arm 32 and the second elastic arm 33 of the other.

The good conductor 4 is fixed to the base 1 and is spaced apart from the vibration unit 2, and the good conductor 4 is located in the magnetic field of the magnetic steel unit 21 to generate a damping force that hinders the movement of the vibration unit 2. In this embodiment, it is specifically fixed to the bottom cover 11. The good conductors 4 are respectively arranged on opposite sides of the vibration unit 2 along the vibration direction perpendicular to the vibration unit 2 and are spaced apart from the vibration unit 2.

More preferably, the good conductor 4 is preferably a copper sheet, which has excellent electrical conductivity.

In this embodiment, as shown in FIG. 4, the magnetization direction of the main magnet 211 is parallel to the vibration direction of the vibration unit 2, and the magnetization direction of the auxiliary magnet 213 is parallel to the vibration direction. The main magnet 211 and the auxiliary magnet 213 of the magnet unit 21 are magnetized along the vibration direction, and the magnetization directions of the main magnet 211 and the auxiliary magnet 213 are opposite. After the magnet unit 21 of the above structure is installed , The magnetic field lines emitted from the magnetic steel unit 21 pass through the good conductor 4 perpendicularly to the vibration direction.

When the vibrating unit 2 vibrates in the direction of vibration, the good conductor 4 is fixed to the base 1 and is stationary, and the magnetic field emitted by the soft magnetic block 212 moves with the movement of the vibrating unit 2, making the magnetic field intensity of a certain point of the good conductor 4 constantly change , Which is equivalent to the good conductor 4 cutting the magnetic field emitted by the soft magnetic block 212, thereby generating induced electromotive force, and the induced electromotive force hinders the movement of the good conductor 4, that is, electromagnetic damping phenomenon, thereby generating the interaction force hindering the movement of the vibrating unit 2 to achieve adjustment The vibration characteristic of the vibration unit 2 acts. The faster the movement speed of the vibration unit 2 is, the greater the induced electromotive force generated by the good conductor 4 and the better the damping characteristic, so that the linear vibration motor 100 has better vibration performance. At the same time, because the electromagnetic damping formed by the good conductor 4 in the above structure is less affected by temperature, the stability of adjusting the vibration characteristics is higher.

In this embodiment, the reinforcing block 5 includes four. For each elastic component 3, the reinforcing block 5 is fixed on the side of the first fixed arm 31 away from the vibration unit 2 and The side of the second fixed arm 34 close to the vibration unit 2. The arrangement of this structure strengthens the fixing strength of the first fixed arm 31 and the vibration unit 2 and strengthens the fixing strength of the second fixed arm 34 and the base 1 to prevent the elastic component 3 Falling off from the vibration unit 2 and/or the base 1 improves the reliability of the linear vibration motor 100.

The limiting block 6 includes two and is respectively fixed to the side of the second fixing arm 34 of the two elastic components 3 away from the vibration unit 2. The setting of the limit block 6 increases the distance between the second elastic arm 33 and the base 1, and prevents the second elastic arm 33 from being caused by excessive amplitude during the vibration of the vibration unit 2 The collision with the base 1 improves the vibration performance and reliability of the linear vibration motor.

The above are only the embodiments of the utility model, and do not limit the patent scope of the utility model. Any equivalent structure or equivalent process transformation made by using the description and drawings of the utility model, or directly or indirectly applied to other Related technical fields are included in the scope of patent protection of the utility model in the same way.

Claims

A linear vibration motor includes a base with a receiving space, a vibrating unit, an elastic component fixed to the base and suspending the vibrating unit in the receiving space, and fixed to the base to drive the The coil unit vibrated by the vibration unit is characterized in that the vibration unit includes a magnetic steel unit that interacts with the coil unit to provide a driving force, and the linear vibration motor further includes Good conductors arranged at intervals between the vibration units, and the good conductors are located in the magnetic field of the magnetic steel unit to generate a damping force that hinders the movement of the vibration unit.
The linear vibration motor according to claim 1, wherein the magnetic steel unit comprises a main magnetic steel and a soft magnetic block attached to the magnetic pole of the main magnetic steel.
The linear vibration motor according to claim 1, wherein the good conductors are respectively arranged on opposite sides of the vibration unit along a vibration direction perpendicular to the vibration unit.
The linear vibration motor according to claim 2, wherein the magnetic steel unit further comprises a secondary magnetic steel, and the secondary magnetic steel is attached to the soft magnetic block away from the main magnetic steel along the vibration direction. On the side.
The linear vibration motor according to claim 4, wherein the soft magnetic block comprises two and is respectively located on opposite sides of the main magnet, and the auxiliary magnet comprises two and is respectively located on the two One side of the soft magnetic block away from the main magnetic steel.
The linear vibration motor of claim 4, wherein the magnetizing directions of the main magnet and the auxiliary magnet are both parallel to the vibration direction, and the magnetizing directions of the main magnet and the auxiliary magnet are both parallel to the vibration direction. The magnetic direction is opposite.
The linear vibration motor according to claim 1, wherein the elastic components comprise two groups, and are respectively fixed on opposite sides of the vibration unit along the vibration direction.
The linear vibration motor according to claim 7, wherein the vibration unit further comprises a mass block, the magnetic steel unit is embedded and fixed in the mass block, and the elastic component is fixed to the mass block.
The linear vibration motor according to claim 7, wherein each of the elastic components includes a first fixed arm, a first elastic arm extending from the first fixed arm, and a first elastic arm reversed from the first fixed arm. A second elastic arm extending in the direction and a second fixed arm extending from the second elastic arm; the first fixed arm is fixed to the vibration unit, and the second fixed arm is fixed to the base.
The linear vibration motor of claim 1, wherein the good conductor is a copper sheet.