WO2021134360A1

WO2021134360A1 - Vibration electric motor

Info

Publication number: WO2021134360A1
Application number: PCT/CN2019/130198
Authority: WO
Inventors: 马杰
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: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-07-08

Abstract

Provided is a vibration electric motor. The vibration electric motor comprises a housing provided with an accommodating space, an elastic assembly arranged in the accommodating space and fixed on the housing, a vibrator suspended in the accommodating space by means of the support of the elastic assembly, and a stator fixed on the housing to drive the vibrator to vibrate. A fixing member, which is clamped between the elastic assembly and the housing and is fixedly connected to the elastic assembly and the housing, is arranged at a position where the elastic assembly is fixed to the housing, and the fixing member comprises a first connection part and a second connection part, which are spaced apart opposite each other in a thickness direction of the vibration electric motor. The fixing member arranged on the vibration electric motor in the present utility model can not only stably connect the elastic assembly and the housing, but also can ensure the length of the elastic assembly, thereby reducing stress of the elastic assembly and improving a vibration effect of the vibration electric motor.

Description

A kind of vibration motor

Technical field

The utility model relates to the technical field of consumer electronics, 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, and with people’s pursuit of user experience, electronic products such as mobile phones, handheld game consoles, car navigation or handheld multimedia entertainment devices are generally adopted Vibration motors are used for system feedback, such as mobile phone call reminders, information reminders, navigation reminders, and vibration feedback from game consoles.

At present, the linear vibration motor in the related art mainly consists of a housing with a housing space inside, an elastic piece provided in the housing space and connected to the housing, a vibrator supported by the elastic piece and suspended in the housing space, and a housing accommodated in the housing space. And the stator opposite to the vibrator, the interaction between the stator and the vibrator can generate force to drive the vibrator to vibrate. In the linear vibration motor in the related art, the shrapnel is fixed on the housing by welding lugs. The presence of the welding lug shortens the length of the elastic arm of the shrapnel and increases the elastic stress, which is not conducive to the sensitivity reflected by the linear vibration motor.

It is necessary to provide a new type of vibration motor to overcome the above-mentioned drawbacks.

technical problem

The purpose of the utility model is to provide a vibration motor with excellent performance.

Technical solutions

The technical solution of the present invention is as follows: a vibration motor, comprising a housing with a housing space, an elastic component arranged in the housing space and fixed to the housing, supported by the elastic component and suspended in the housing The vibrator in the accommodating space and a stator fixed to the housing to drive the vibrator to vibrate, and a position where the elastic component and the housing are fixed is provided between the elastic component and the housing. A fixing member for fixedly connecting the elastic component and the housing in between, the fixing member includes a first connecting portion and a second connecting portion that are arranged at a relatively interval in the thickness direction of the vibration motor.

Preferably, the fixing member further includes an intermediate connecting portion connecting the first connecting portion and the second connecting portion, the width of the first connecting portion in a direction perpendicular to the thickness of the vibration motor and the The width of the second connecting portion in the direction perpendicular to the thickness of the vibration motor is greater than the width of the intermediate connecting portion in the direction perpendicular to the thickness of the vibration motor.

Preferably, the width of the first connecting portion in the direction perpendicular to the thickness of the vibration motor and the width of the second connecting portion in the direction perpendicular to the thickness of the vibration motor are both at least as large as the width of the intermediate connecting portion. 3 times the width in the direction perpendicular to the thickness of the vibration motor.

Preferably, the intermediate connecting portion connects the center position of the first connecting portion and the center position of the second connecting portion respectively, and the intermediate connecting piece is arranged parallel to the thickness direction of the vibration motor.

Preferably, the width of the first connecting portion in the direction perpendicular to the thickness of the vibration motor is equal to the width of the second connecting portion in the direction perpendicular to the thickness of the vibration motor.

Preferably, the fixing member is a metal welding sheet.

Preferably, the outer contour of the vibrator is in a rectangular structure, and includes a first side that is relatively parallel and a second side that is relatively parallel and connected to the first side; the elastic component includes a The housing is close to one side of one of the first sides and is spaced apart from the fixed arm of the vibrator, and the first side is bent and extended from the opposite ends of the fixed arm in a direction close to the adjacent first side. An elastic arm, a second elastic arm bent and extended from an end of the first elastic arm away from the fixed arm in a direction close to the adjacent second side, and a second elastic arm extending and fixed by the second elastic arm For the connecting arm on the second side of the vibrator, the fixing member is sandwiched between the fixing arm and the housing.

Preferably, the included angle between the second elastic arm and the second side edge is greater than the included angle between the first elastic arm and the housing.

Preferably, the number of the elastic components is two, and the two elastic components are respectively arranged on opposite sides of the vibrator, wherein the second elastic arms of the two elastic components are located on the vibration motor Stacked and crossed in the thickness direction.

Preferably, the stator includes a stator that is fixed to the housing to drive the vibrator in a first direction, a second direction, or along a plane formed by the first direction and the second direction. A coil unit that vibrates in a third direction that coincides with the first direction and the second direction, the first direction and the second direction are perpendicular to each other, and the coil unit includes a coil unit fixed to the housing and located at the An iron core on one or both sides of the vibrator and a coil wound around the iron core.

Preferably, the vibrator includes a magnetic steel unit that is spaced apart from the coil unit and interacts to provide a driving force, and the magnetic steel unit includes a first magnet part and a second magnet part that are magnetized in a magnetizing direction. The magnetic poles of the first magnet part and the second magnet part are opposite, and the magnetizing direction is perpendicular to the plane formed by the first direction and the second direction; the first magnet part and the second magnet part have opposite magnetic poles. The interface of the magnet part forms an included angle of non-90 degrees with the first direction, the coil is in a racetrack shape, and the long axis or the short axis of the coil is parallel to the interface.

Preferably, the iron core is strip-shaped, the length direction of the iron core is parallel to the long axis direction of the coil, and the thickness direction of the iron core is parallel to the magnetizing direction; the coil unit further includes The magnetic conductive sheet attached to the side of the coil away from the vibrator, the magnetic conductive sheet is connected to the iron core; the magnetic conductive sheet is provided with a relief opening extending inward from its periphery, the The welding lead of the coil extends through the relief opening.

Preferably, the vibrator further includes a mass block, the mass block is provided with a receiving through hole penetrating therethrough along the magnetizing direction, the magnetic steel unit is received in the receiving through hole and fixed, so The elastic component is connected with the mass block; the coil unit is partially located in the receiving through hole. To

Preferably, the housing includes a bottom wall, a side wall bent and extended from an edge of the bottom wall, and a cover plate covering an end of the side wall away from the bottom wall. The wall and the cover plate enclose the accommodating space; the side surface of the mass block facing the cover plate or the bottom wall is provided with a limiting groove, and the cover plate or the bottom wall faces the side surface of the mass block A limit block is provided in the limit slot to limit the movement and displacement of the mass block.

Beneficial effect

Compared with the prior art, the beneficial effect of the present utility model is that the vibration motor of the present utility model is used to connect the elastic component and the fixing part of the housing, and the fixing part includes a first connecting part and a second connecting part that are relatively spaced apart. In this way, the elastic component and the housing can be firmly connected, and the length of the elastic component can be ensured, the stress of the elastic component can be reduced, and the vibration effect of the vibration motor can be improved.

Description of the drawings

Figure 1 is a perspective view of a vibrating motor according to an embodiment of the utility model;

Fig. 2 is a cross-sectional view of Fig. 1 along the A-A direction.

Fig. 3 is an internal schematic diagram of a vibration motor according to an embodiment of the utility model.

Figure 4 is an exploded view of the vibrating motor of the embodiment of the utility model.

Fig. 5 is a partial internal schematic diagram of the vibration motor of the embodiment of the utility model from another perspective.

Figure 6 is a schematic diagram of the structure of the vibration motor soldering sheet according to the embodiment of the utility model.

The best mode of the present invention

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

The utility model provides a vibration motor 100. For the convenience of description, an XYZ three-axis coordinate system is established. As shown in Figure 4, the X-axis direction is defined as the first direction, and the Y-axis direction is defined as the second direction. The direction along the Z axis is defined as the magnetizing direction, where the first direction and the second direction are two different vibration directions, and the magnetizing direction is the thickness direction of the vibrating motor 100. Then, the first direction, the second direction and the charging The magnetic directions are perpendicular to each other.

Referring to FIGS. 1-6, the vibration motor 100 includes a housing 10 having a housing space 15, an elastic component 20 disposed in the housing space 15 and fixed to the housing 10, and supported by the elastic component 20 The vibrator 40 suspended in the housing space 15, the stator 30 fixed to the housing 10 to drive the vibrator 40 to vibrate, and the damping device sandwiched between the elastic component 20 and the vibrator 40 Piece 43.

The housing 10 includes a bottom wall 13, a side wall 12 bent and extended from the edge of the bottom wall 13, and a cover plate 11 covering an end of the side wall 12 away from the bottom wall 13. The bottom wall 13, the side wall 12 and the cover plate 11 enclose the receiving space 15.

A fixing member 50 is provided at a position where the elastic component 20 is fixed to the side wall 12 of the casing 10, and the fixing member 50 is sandwiched between the elastic component 20 and the casing 10 and protects the elastic The assembly 20 and the housing 10 are fixedly connected, and the fixing member 50 is a metal welding sheet. The fixing member 50 includes a first connecting portion 51 and a second connecting portion 53 which are relatively spaced apart in the thickness direction of the vibration motor 100. In this way, the elastic component 20 and the housing 10 can be fixedly connected, the length of the elastic component 20 can be ensured, the stress of the elastic component 20 can be reduced, and the vibration effect of the vibration motor 100 can be improved.

In one embodiment, in order to firmly connect the elastic component 20 and the side wall 12 of the housing 10, the fixing member 50 further includes an intermediate connecting portion 52 connecting the first connecting portion 51 and the second connecting portion 53. The width of the first connecting portion 51 in the direction perpendicular to the thickness of the vibration motor 100 and the width of the second connecting portion 53 in the direction perpendicular to the thickness of the vibration motor 100 are both larger than those of the intermediate connecting portion 52. The width perpendicular to the thickness direction of the vibration motor 100, that is, the fixing member 50 resembles an I-shape.

Specifically, in a preferred embodiment of the present invention, the width of the first connecting portion 51 in the direction perpendicular to the thickness of the vibration motor 100 and the width of the second connecting portion 53 in the direction perpendicular to the vibration motor 100 The width in the thickness direction is at least 3 times the width of the intermediate connecting portion 52 in the direction perpendicular to the thickness of the vibration motor 100. Further, the width of the first connecting portion 51 in the direction perpendicular to the thickness of the vibration motor and the width of the second connecting portion 53 in the direction perpendicular to the thickness of the vibration motor are equal. The intermediate connecting portion 52 connects the center position of the first connecting portion 51 and the center position of the second connecting portion 53 respectively, and the intermediate connecting portion 52 is arranged parallel to the thickness direction of the vibration motor 100. In this way, through the first connecting portion 51 and the second connecting portion 53, the contact width between the elastic component 20 and the housing 10 is larger, and the width of the intermediate connecting portion 52 is smaller, which ensures a stable connection between the elastic component 20 and the housing 10 at the same time. , It can also ensure that the stress of the elastic component 20 is small, and prevent the vibration effect of the vibration motor 100 from being affected.

The outer contour of the vibrator 40 has a rectangular structure, and includes a first side 411 that is relatively parallel and a second side 412 that is relatively parallel and connected to the first side 411.

The elastic component 20 includes a fixed arm 21 fixed to the housing 10, and a first elastic arm bent and extended from opposite ends of the fixed arm 21 in a direction close to the adjacent first side 411. 22. The second elastic arm 23 bent and extended from the end of the first elastic arm 22 away from the fixed arm 21 in the direction close to the adjacent second side 412, and the second elastic arm 23 The connecting arm 24 extends and is fixed to the second side 412 of the vibrator 40, and the fixed arm 21 is close to one side of the first side 411 and is spaced apart from the vibrator 40. The second elastic arm The included angle between 23 and the second side 412 is greater than the included angle between the first elastic arm 22 and the side wall 12 of the housing 10. Wherein, in order to reduce the volume of the vibration motor 100, the number of the elastic components 20 is two, and the two elastic components 20 are respectively disposed on opposite sides of the vibrator 40, wherein, two elastic components 20 The second elastic arms 23 of the assembly are stacked and crossed in the thickness direction of the vibration motor. In this way, the first elastic arm 22 and the second elastic arm 23 can be formed to be spaced apart from the vibrator 40 and the vibrator 40 is formed to be suspended. The fixing member 50 is sandwiched between the fixing arm 21 and the housing 10. In combination with the fixing member 50 provided by the present invention, the length of the first elastic arm 22 can be lengthened, the stress of the elastic component 20 can be effectively reduced, and the vibration effect of the vibration motor 100 can be improved.

The stator 30 includes fixed to the housing 10 to drive the vibrator 40 in a first direction, a second direction, or along a plane formed by the first direction and the second direction and is not in contact with each other. The coil unit 31 vibrating in a third direction where the first direction and the second direction overlap, the first direction and the second direction are perpendicular to each other, and the coil unit 31 includes and is fixed to the housing 10 An iron core 32 located on one or both sides of the vibrator 40 and a coil 31 wound around the iron core 32. Specifically, the stator 30 is fixed to the bottom wall 13 and the cover plate 11 respectively.

The vibrator 40 includes a magnetic steel unit 42 and a mass 41. The magnetic steel unit 42 is spaced apart from the coil unit and interacts to provide a driving force. The vibrator 40 also includes a mass 41. The mass 41 Used to increase the weight of the vibrator 40 and improve the vibration performance. The mass 41 is provided with a receiving through hole 414 passing through it along the magnetizing direction. The magnetic steel unit 42 is received and fixed in the receiving through hole 414. The elastic component 20 and the mass Block 41 is connected; the coil unit is partially located in the receiving through hole 414.

The magnetic steel unit 42 includes a first magnet part 421 and a second magnet part 422 that are magnetized along a magnetizing direction, and the first magnet part 421 and the second magnet part 422 have opposite magnetic poles, and the magnetizing direction It is perpendicular to the plane formed by the first direction and the second direction. The interface 423 of the first magnet portion 421 and the second magnet portion 422 forms an included angle other than 90 degrees with the first direction, or an included angle other than 90 degrees with the second direction.

In this embodiment, the coil 31 has a racetrack shape and the long axis or the short axis of the coil 31 is parallel to the interface 423. The iron core 32 has a strip shape, the length direction of the iron core 32 is parallel to the long axis direction of the coil 31, and the thickness direction of the iron core 32 is parallel to the magnetizing direction.

In order to reduce magnetic leakage, the stator 30 further includes a magnetic conductive sheet 33 attached to the coil 31 on a side away from the vibrator 40, and the magnetic conductive sheet 33 is connected to the iron core 32.

More preferably, the magnetic conductive sheet 33 is provided with a relief opening 331 extending inward from its periphery, and the welding lead of the coil 31 extends through the relief opening 331.

The damping member 43 includes four and is located at the four corners of the mass 41. Each of the damping members 43 abuts against the adjacent first elastic arm 22 and the second elastic arm 23 of the corresponding elastic component 20. That is to say, the damping member 43 has parts in contact with the mass 41 and the elastic component 20 in the first direction and the second direction, so as to realize the mass 41 in the first direction (X-axis direction) and the second direction. (Y-axis direction) or the third direction (direction on the plane formed by the X-axis and the Y-axis and not coincident with the X-axis and the Y-axis) provides damping to improve its stability and reliability.

More preferably, the side surface of the mass block 41 facing the cover plate 11 or the bottom wall 13 is provided with a limiting groove 413, and the side surface of the cover plate 11 or the bottom wall 13 facing the mass block 41 is provided A limit block 111 located in the limit slot 413 to limit the movement and displacement of the mass block 41. The body of the limit block 111 realizes the displacement limit of the vibrator 40 when vibrating in the second direction, and the limit block 111 is at least partially placed in the limit slot 413 to limit the movement and displacement of the mass block 41.

More preferably, in order to further reduce the size of the vibration motor 100 along the magnetizing direction (its thickness direction, that is, the Z-axis direction), it reduces its thickness. In this embodiment, referring to FIG. 4, the two elastic components 20 are stacked and crossed along the magnetizing direction, and the two limiting blocks 111 are respectively fixed to the housing 10 along the On opposite sides of the magnetizing direction, the two limiting grooves 413 are respectively opened on the opposite sides of the mass 41 along the magnetizing direction. Therefore, in the magnetizing direction, the limiting block 111 and the elastic component 20 make full use of the thickness space of the mass block 41 along the magnetizing direction.

As shown in Figure 2, when the coil 31 is energized, the energized coil 31 cuts the magnetic lines of induction to form ampere force. At the same time, the iron core 32 is polarized due to the energization of the coil 31 and has a polarity. The two iron cores 32 respectively act on the magnetic steel unit 42 to form electromagnetic force. The ampere force and the electromagnetic force work together to form a driving force along the normal direction of the interface 423, as shown in Figure X. The driving force has driving force components in the first direction and the second direction, so that the driving force is in the first direction, the second direction, and is located on the plane formed by the first direction and the second direction and does not coincide with the The vibration in the third direction in which the first direction and the second direction coincide provides driving force. When the frequency of the current (that is, the frequency of the driving signal) is close to the resonance frequency of the vibration motor 100 in the first direction or the second direction , The mode in the first direction or the second direction is excited to form the main direction of movement. When the frequency of the driving signal corresponds to the resonance frequency in the first direction and the resonance frequency in the second direction at the same time, the vibrator 40 is in the first direction (X) and the second vibration (Y) mode It is excited at the same time. At this time, under the action of the resultant force, the vibrator 40 vibrates along the third direction.

However, the above-mentioned structure arrangement makes great use of the interaction between the stator 30 and the magnetic steel unit 42, which effectively increases the driving force and improves the vibration performance.

It should be understood that the shapes of the mass 41, the iron core 32 and other components described above are only used as examples and are not limited to the present invention. The iron core 32 can also be cylindrical or other shapes. The mass 41 can also be circular, for example, A square or other regular or irregular shape only needs to be able to fix the magnetic steel unit 42 and connect with the elastic component 20. Compared with the related art, in the vibration motor 100 of the present invention, a fixing member 50 for connecting the elastic component 20 and the housing 10, and the fixing member 50 includes a first connecting portion 51 and a second connecting portion that are arranged relatively spaced apart 53. In this way, the elastic component 20 and the housing 10 can be connected, the length of the elastic component 20 can be ensured, the stress of the elastic component 20 can be reduced, and the vibration effect of the vibration motor 100 can be improved.

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

Claims

A vibration motor includes a housing with a housing space, an elastic component arranged in the housing space and fixed to the housing, a vibrator supported by the elastic component and suspended in the housing space, and The stator fixed to the housing to drive the vibrator to vibrate is characterized by:

The position where the elastic component and the casing are fixed is provided with a fixing member that is sandwiched between the elastic component and the casing to fixedly connect the elastic component and the casing, and the fixing member includes The first connecting portion and the second connecting portion are arranged relatively spaced apart in the thickness direction of the vibration motor.
The vibration motor according to claim 1, wherein the fixing member further comprises an intermediate connecting portion connecting the first connecting portion and the second connecting portion, and the first connecting portion is perpendicular to The width in the thickness direction of the vibration motor and the width of the second connecting portion in the direction perpendicular to the thickness of the vibration motor are both larger than the width of the intermediate connecting portion in the direction perpendicular to the thickness of the vibration motor.
The vibration motor according to claim 2, wherein the width of the first connecting portion in the direction perpendicular to the thickness of the vibration motor and the width of the second connecting portion in the direction perpendicular to the thickness of the vibration motor The width of the upper part is at least 3 times the width of the intermediate connecting part in the direction perpendicular to the thickness of the vibration motor.
The vibration motor according to claim 2, wherein the intermediate connecting part connects the center position of the first connecting part and the center position of the second connecting part respectively, and the intermediate connecting part is parallel to The vibration motor is arranged in the thickness direction.
The vibration motor according to claim 4, wherein the width of the first connecting portion in the direction perpendicular to the thickness of the vibration motor and the width of the second connecting portion in the direction perpendicular to the thickness of the vibration motor The upper widths are equal.
The vibration motor according to any one of claims 1 to 5, wherein the fixing member is a metal welding sheet.
The vibration motor according to claim 1, wherein the outer contour of the vibrator is a rectangular structure, and includes a first side that is relatively parallel and a second side that is relatively parallel and connected to the first side. Side; the elastic component includes a fixed arm fixed on the side of the housing close to one of the first side and spaced apart from the vibrator, by the opposite ends of the fixed arm respectively along the adjacent adjacent A first elastic arm that is bent and extended in the direction of the first side, and a second elastic arm that is bent and extended from an end of the first elastic arm away from the fixed arm in a direction close to the adjacent second side , And a connecting arm extending from the second elastic arm and fixed to the second side of the vibrator, and the fixing member is sandwiched between the fixing arm and the housing.
The vibration motor according to claim 7, wherein the angle between the second elastic arm and the second side is greater than the angle between the first elastic arm and the housing angle.
The vibration motor according to claim 7, wherein the number of the elastic components is two, and the two elastic components are respectively disposed on opposite sides of the vibrator, wherein two of the elastic components are provided on opposite sides of the vibrator. The second elastic arms of the elastic component are stacked and crossed in the thickness direction of the vibration motor.
7. A vibration motor according to claim 7, characterized in that: the stator includes fixed to the housing to drive the vibrator along the first direction, the second direction, or along the first and second directions. A coil unit vibrating in a third direction on a plane formed by the second direction that does not overlap with the first direction and the second direction, the first direction and the second direction are perpendicular to each other, the The coil unit includes an iron core fixed to the housing and located on one or both sides of the vibrator and a coil wound around the iron core.
The vibration motor according to claim 10, characterized in that: the vibrator includes a magnetic steel unit that is spaced apart from the coil unit and interacts to provide a driving force, and the magnetic steel unit includes a magnetizing unit along the magnetizing direction. The first magnet part and the second magnet part of magnetism and the magnetic poles of the first magnet part and the second magnet part are opposite, and the magnetizing direction is perpendicular to the plane formed by the first direction and the second direction The interface between the first magnet part and the second magnet part forms an included angle of non-90 degrees with the first direction, the coil is in a racetrack shape, and the long axis or the short axis of the coil is parallel to the The interface is described.
The vibration motor according to claim 11, wherein the iron core is strip-shaped, the length direction of the iron core is parallel to the long axis direction of the coil, and the thickness direction of the iron core is parallel to the charging The magnetic direction is parallel; the coil unit also includes a magnetic conductive sheet attached to the side of the coil away from the vibrator, and the magnetic conductive sheet is connected to the iron core; the magnetic conductive sheet is provided with a peripheral edge An inwardly extending relief opening, through which the welding lead of the coil extends.
The vibration motor according to claim 11, wherein the vibrator further comprises a mass, and the mass is provided with a receiving through hole penetrating it along the magnetizing direction, and the magnetic steel unit receives It is fixed in the receiving through hole, the elastic component is connected with the mass block; the coil unit is partially located in the receiving through hole.
The vibration motor according to claim 13, wherein the housing includes a bottom wall, a side wall bent and extended from the edge of the bottom wall, and a cover provided at an end of the side wall away from the bottom wall. The cover plate, the bottom wall, the side walls and the cover plate enclose the containing space; the side of the mass facing the cover plate or the bottom wall is provided with a limiting groove, the cover plate Or the side surface of the bottom wall facing the mass block is provided with a limit block located in the limit groove to limit the movement and displacement of the mass block.