Linear vibration motor

Abstract

The linear vibration motor provided by the present invention includes a vibration component including a mass block with a receiving hole, a magnetic steel component fixed to the mass block, and a guide; the stator component includes an iron core and a coil, the iron core includes an iron core body around which the coil is wound, and an extension structure, the extension structure includes a first extension extending from the first end of the iron core body, a first claw pole extending from the first extension toward the second end, a second extension extending from the second end of the iron core body, and a second claw pole extending from the second extension toward the first end, the first claw pole and the second claw pole are arranged at intervals along the vibration direction and are both arranged opposite to the magnetic steel component. By arranging the first claw pole and the second claw pole staggered along the vibration direction, the thickness of the linear vibration motor is reduced while ensuring sufficient driving force, so that it can be better applied to thinner mobile terminals.

Description

[Technical field]

[0001] The invention relates to a motor, and in particular to a linear vibration motor used in the field of mobile electronic products. [Background technology]

[0002] 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 devices. These electronic products generally use linear vibration motors for system feedback, such as incoming call prompts, message prompts, navigation prompts, vibration feedback of game consoles, etc.

[0003] The linear vibration motor of the related technology includes a shell with a receiving space, a vibration component located in the receiving space and a stator component fixed to the shell, the vibration component includes a mass block with a receiving hole and a magnet fixed to the mass block and received in the receiving hole, the stator component is partially received in the receiving hole, and includes an iron core and an iron core wound around a coil, the coil and the magnet interact to generate a driving force to drive the vibration component to vibrate reciprocatingly, thereby providing a vibration sense.

[0004] However, in order to generate sufficient driving force between the coil and the magnet, the linear vibration motor in the related art requires a certain thickness of space in the magnetic circuit design, which makes it impossible to further reduce the product height of the linear vibration motor and cannot meet the development trend of lightweight and thin consumer electronic products.

[0005] Therefore, it is necessary to provide a new linear vibration motor to solve the above problems. [Summary of the invention]

[0006] Based on the above problems, the present invention proposes a linear vibration motor with good vibration performance and small thickness.

[0007] To achieve the above-mentioned object, the present invention proposes a linear vibration motor, which includes a shell with a receiving space and a vibration component and a stator component received in the receiving space, the vibration component includes a mass block received in the receiving space, a magnetic steel component fixed to the mass block, and a guide member for driving the mass block to reciprocate, the mass block includes a receiving hole passing therethrough, the magnetic steel component is received in the receiving hole, the stator component is fixed to the shell and at least partially received in the receiving hole, the stator component includes an iron core fixed to the shell and a coil wound on the iron core, the iron core includes an iron core main body for winding the coil The core body comprises a first end and a second end along the thickness direction of the coil, the extension structure comprises a plurality of mutually parallel and spaced first extension portions extending from the first end toward the magnetic steel component, a first claw pole extending from one end of the first extension portion away from the core body toward the second end, a plurality of mutually parallel and spaced second extension portions extending from the second end toward the magnetic steel component, and a second claw pole extending from one end of the second extension portion away from the core body toward the first end, the first claw pole and the second claw pole being spaced apart along the vibration direction and both being arranged opposite to the magnetic steel component.

[0008] Preferably, the height of the core body along the thickness direction is greater than the thickness of the coil, and the first end portion and the second end portion extend out of the coil along the thickness direction.

[0009] Preferably, the coil includes a first top surface perpendicular to the thickness direction, a first bottom surface arranged relative to the first top surface, and an outer side surface connecting the first top surface and the first bottom surface, the first extension portion is parallel to the first top surface, the second extension portion is parallel to the first bottom surface, and the first claw pole and the second claw pole are both parallel to the outer side surface.

[0010] Preferably, the coil is in a racetrack shape, the outer side surface includes a first outer side surface extending along the long axis and parallel to the vibration direction, and the first claw pole and the second claw pole are alternately arranged in sequence along the first outer side surface.

[0011] Preferably, a projection of the first extension portion along the thickness direction is located between two adjacent second extension portions.

[0012] Preferably, the magnetic steel assembly includes a magnetic steel fixed to the mass block and arranged relative to the first claw pole and the second claw pole, the magnetic steel includes a first magnetizing region and a second magnetizing region with opposite magnetizing directions, the first magnetizing region is arranged relative to the first claw pole, and the second magnetizing region is arranged relative to the second claw pole.

[0013] Preferably, the magnetization direction of the magnetic steel is perpendicular to the thickness direction and the vibration direction.

[0014] Preferably, the shell includes a bottom cover for fixing the core body, a top cover arranged relative to the bottom cover and a side wall connecting the bottom cover and the top cover, and the coil is arranged relative to the bottom cover and the top cover.

[0015] Preferably, the guide member is a spring, one end of the spring is fixed to the mass block, and the other end of the spring is fixed to the side wall.

[0016] Preferably, the guide member includes a first permanent magnet fixed on the mass block and a second permanent magnet fixed on the side wall, the first permanent magnet and the second permanent magnet are arranged opposite to each other along the vibration direction, the first permanent magnet and the second permanent magnet are magnetized along the vibration direction and are arranged opposite to each other with the same poles.

[0017] Compared with the related art, the vibration assembly of the linear vibration motor provided by the present invention includes a mass block with a receiving hole, a magnetic steel assembly fixed to the mass block, and a guide member for driving the mass block to reciprocate; the stator assembly at least partially received in the receiving hole includes an iron core and a coil wound on the iron core, the iron core includes an iron core body around which the coil is wound and an extension structure, the extension structure includes a first extension extending from the first end of the iron core body, a first claw pole extending from the first extension toward the second end, a second extension extending from the second end of the iron core body, and a second claw pole extending from the second extension toward the first end, the first claw pole and the second claw pole are arranged at intervals along the vibration direction and are both arranged opposite to the magnetic steel assembly; after the coil is energized, the first claw pole and the second claw pole are polarized and interact with the magnetic steel assembly to generate a driving force. By arranging the first claw pole and the second claw pole staggered along the vibration direction, the thickness of the linear vibration motor is reduced while ensuring sufficient driving force, so that it can be better applied to thinner mobile terminals.

Brief Description of the Drawings

[0018] Figure 1 is a three-dimensional diagram of the linear vibration motor of the present invention;

[0019] Figure 2 An exploded view of the linear vibration motor of the present invention;

[0020] Figure 3 is a three-dimensional diagram of an iron core in a linear vibration motor of the present invention;

[0021] Figure 4 for Figure 1 Sectional view along line AA;

[0022] Figure 5for Figure 1 Sectional view along line BB;

[0023] Figure 6 for Figure 5 Enlarged view of part C;

[0024] Figure 7 Schematic diagram of the magnetic circuit of the pole core and magnetic steel of the linear vibration motor of the present invention;

[0025] Figure 8 is a three-dimensional diagram of a linear vibration motor according to another embodiment of the present invention;

[0026] Fig. 9 It is a three-dimensional diagram of a linear vibration motor without a top cover in another embodiment of the present invention. [Specific implementation method]

[0027] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific implementation methods.

[0028] like Figure 1-Figure 7 As shown, the present invention provides a linear vibration motor 100, which includes a housing 1 having a receiving space 10 and a vibration component 2 and a stator component 3 received in the receiving space 10; wherein the stator component 3 can drive the vibration component 2 to vibrate back and forth along its vibration direction X to provide a vibration sensation.

[0029] The housing 1 includes a bottom cover 11 for fixing the stator assembly 3 , a top cover 12 spaced apart from the bottom cover 11 , and a side wall 13 connecting the bottom cover 11 and the top cover 12 . The bottom cover 11 , the top cover 12 , and the side wall 13 enclose the receiving space 10 .

[0030] The vibration assembly 2 includes a mass block 21 accommodated in the accommodation space 10, a magnetic steel assembly 22 fixed to the mass block 21, and a guide 23 for driving the mass block 21 to reciprocate; specifically, the mass block 21 includes a receiving hole 211 penetrating therethrough, and the magnetic steel assembly 22 is accommodated in the receiving hole 211; further, the magnetic steel assembly 22 includes a pole core 221 fixed to the mass block 21 and a magnetic steel 222 fixed to the pole core 221. It can be seen that the pole core 221 is sandwiched between the magnetic steel 222 and the mass block 21; the magnetic steel 222 is arranged relative to the stator assembly 3; Figure 7 As shown, the magnetic steel 222 includes a first magnetizing region 2221 and a second magnetizing region 2222 which are arranged adjacent to each other in the vibration direction X and have opposite magnetizing directions.

[0031] The stator assembly 3 includes an iron core 31 fixed on the bottom cover 11 of the housing 1 and a coil 32 wound around the iron core 31; specifically, Figures 2 to 6 As shown, the iron core 31 includes an iron core body 311 and an extension structure 312 for winding the coil 32; wherein the coil 32 is wound at the middle position of the iron core body 311 along the thickness direction Y, so that the coil 32 is spaced apart from the bottom cover 11 and the top cover 12. The core body 311 includes a first end 3111 and a second end 3112 along the thickness direction Y of the coil 32, the extension structure 312 includes a plurality of mutually parallel and spaced first extension portions 3121 extending from the first end 3111 toward the magnetic steel component 22, a first claw pole 3122 extending from one end of the first extension portion 3121 away from the core body 311 toward the second end 3112, a plurality of mutually parallel and spaced second extension portions 3123 extending from the second end 3112 toward the magnetic steel component 22, and a second claw pole 3124 extending from one end of the second extension portion 3123 away from the core body 311 toward the first end 3111, the first claw pole 3122 and the second claw pole 3124 are arranged at intervals along the vibration direction X and are both arranged opposite to the magnetic steel component 22; the projection of the first extension portion 3121 along the thickness direction Y is located between two adjacent second extension portions 3123. It is understandable that the number of the first claw poles 3122 and the second claw poles 3124 can be adjusted according to demand and is not limited here.

[0032] In this embodiment, in order to allow the first end 3111 and the second end 3112 to extend out of the coil 32, the height of the core body 311 along the thickness direction Y is greater than the thickness of the coil 32. Specifically, the coil 32 includes a first top surface 321 perpendicular to the thickness direction Y, a first bottom surface 322 arranged relatively spaced from the first top surface 321, and an outer side surface 323 connecting the first top surface 321 and the first bottom surface 322, the first extension portion 3121 is parallel to the first top surface 321, the second extension portion 3123 is parallel to the first bottom surface 322, and the first claw pole 3122 and the second claw pole 3124 are both parallel to the outer side surface 323.

[0033] In this embodiment, the first claw pole 3122 is arranged opposite to the first magnetizing region 2221, and the second claw pole 3124 is arranged opposite to the second magnetizing region 2222; it can be understood that in the linear vibration motor 100 provided by the present invention, the magnetizing directions Z of the first magnetizing region 2221 and the second magnetizing region 2222 of the magnetic steel 222 are perpendicular to the vibration direction X and the thickness direction Y. Therefore, the first claw pole 3122 and the first magnetizing region 2221 are arranged opposite to each other along the magnetizing direction Z, and the second claw pole 3124 is similar, that is, the second claw pole 3124 and the second magnetizing region 2222 are arranged opposite to each other along the magnetizing direction Z.

[0034] Specifically, the coil 32 is in a runway shape, and the outer side surface 323 includes a first outer side surface 3231 extending along the long axis direction and parallel to the vibration direction X, and the first claw pole 3122 and the second claw pole 3124 are arranged alternately in sequence along the first outer side surface 3231; in this way, when the coil 32 is energized, the pole core 31 is polarized, and the first claw pole 3122 and the second claw pole 3124 have different polarities, which interact with the magnetic steel 222 to generate a driving force to drive the mass block to reciprocate along the vibration direction X. In this way, the magnetic steel 222 that generates the driving force and the first claw pole 3122 and the second claw pole 3124 are arranged along the vibration direction X instead of the thickness direction Y. On the premise of ensuring sufficient driving force, the thickness of the linear vibration motor 100 is reduced, so that it can be better applied to thinner mobile terminals.

[0035] In this embodiment, the guide member 23 of the linear vibration motor 100 is a spring, one end of which is fixed to the mass block 21 , and the other end of which is fixed to the side wall 13 of the housing 1 .

[0036] like Figure 8-Figure 9 As shown, another embodiment of the present invention further provides a linear vibration motor 200, which is only different from the linear vibration motor 100 in that the guide member 23 in the linear vibration motor 200 includes a first permanent magnet 231 fixed on the mass block 21 and a second permanent magnet 232 fixed on the side wall 13, the first permanent magnet 231 and the second permanent magnet 232 are arranged opposite to each other along the vibration direction X, the first permanent magnet 231 and the second permanent magnet 232 are magnetized along the vibration direction X and arranged opposite to each other with the same poles, and when the mass block 21 moves close to the first permanent magnet 231, it interacts with the second permanent magnet 232 to generate resistance.

[0037] Compared with the related art, the vibration assembly of the linear vibration motor provided by the present invention includes a mass block with a receiving hole, a magnetic steel assembly fixed to the mass block, and a guide member for driving the mass block to reciprocate; the stator assembly at least partially received in the receiving hole includes an iron core and a coil wound on the iron core, the iron core includes an iron core body around which the coil is wound and an extension structure, the extension structure includes a first extension extending from the first end of the iron core body, a first claw pole extending from the first extension toward the second end, a second extension extending from the second end of the iron core body, and a second claw pole extending from the second extension toward the first end, the first claw pole and the second claw pole are arranged at intervals along the vibration direction and are both arranged opposite to the magnetic steel assembly; after the coil is energized, the first claw pole and the second claw pole are polarized and interact with the magnetic steel assembly to generate a driving force. By arranging the first claw pole and the second claw pole staggered along the vibration direction, the thickness of the linear vibration motor is reduced while ensuring sufficient driving force, so that it can be better applied to thinner mobile terminals.

[0038] The above description is only an implementation mode of the present invention. It should be pointed out that, for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present invention, but these all belong to the protection scope of the present invention.

Claims

1. A linear vibration motor, comprising a housing having a receiving space, and a vibration component and a stator component received in the receiving space, wherein the vibration component comprises a mass block received in the receiving space, a magnetic steel component fixed to the mass block, and a guide member for driving the mass block to reciprocate, wherein the mass block comprises a receiving hole passing therethrough, the magnetic steel component is received in the receiving hole, the stator component is fixed to the housing and at least partially received in the receiving hole, and characterized in that: The stator assembly includes an iron core fixed to the shell and a coil wound on the iron core, the iron core includes an iron core body for winding the coil and an extension structure, the iron core body includes a first end and a second end along the thickness direction of the coil, the extension structure includes a plurality of mutually parallel and spaced first extensions extending from the first end toward the magnetic steel assembly, a first claw pole extending from an end of the first extension away from the iron core body toward the second end, a plurality of mutually parallel and spaced second extensions extending from the second end toward the magnetic steel assembly, and a second claw pole extending from an end of the second extension away from the iron core body toward the first end, the first claw pole and the second claw pole are arranged at intervals along the vibration direction and are both arranged opposite to the magnetic steel assembly.

2. The linear vibration motor according to claim 1, characterized in that: The height of the core body along the thickness direction is greater than the thickness of the coil, and the first end portion and the second end portion extend out of the coil along the thickness direction.

3. The linear vibration motor according to claim 2, characterized in that: The coil includes a first top surface perpendicular to the thickness direction, a first bottom surface arranged relative to the first top surface and an outer side surface connecting the first top surface and the first bottom surface, the first extension portion is parallel to the first top surface, the second extension portion is parallel to the first bottom surface, and the first claw pole and the second claw pole are both parallel to the outer side surface.

4. The linear vibration motor according to claim 3, characterized in that: The coil is in a racetrack shape, the outer side surface includes a first outer side surface extending along the long axis and parallel to the vibration direction, and the first claw pole and the second claw pole are alternately arranged in sequence along the first outer side surface.

5. The linear vibration motor according to claim 1, characterized in that: A projection of the first extending portion along the thickness direction is located between two adjacent second extending portions.

6. The linear vibration motor according to claim 1, characterized in that: The magnetic steel assembly includes a magnetic steel fixed to the mass block and arranged relative to the first claw pole and the second claw pole, the magnetic steel includes a first magnetizing region and a second magnetizing region with opposite magnetizing directions, the first magnetizing region is arranged relative to the first claw pole, and the second magnetizing region is arranged relative to the second claw pole.

7. The linear vibration motor according to claim 6, characterized in that: The magnetization direction of the magnetic steel is perpendicular to the thickness direction and the vibration direction.

8. The linear vibration motor according to claim 7, characterized in that: The shell includes a bottom cover for fixing the core body, a top cover arranged relatively and spaced apart from the bottom cover, and a side wall connecting the bottom cover and the top cover. The coil is spaced apart from the bottom cover and the top cover.

9. The linear vibration motor according to claim 8, characterized in that: The guide member is a spring, one end of which is fixed to the mass block, and the other end of which is fixed to the side wall.

10. The linear vibration motor according to claim 8, characterized in that: The guide member includes a first permanent magnet fixed on the mass block and a second permanent magnet fixed on the side wall. The first permanent magnet and the second permanent magnet are arranged opposite to each other along the vibration direction. The first permanent magnet and the second permanent magnet are magnetized along the vibration direction and arranged opposite to each other with the same poles.

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