WO2022000643A1 - 线性振动电机 - Google Patents

线性振动电机 Download PDF

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Publication number
WO2022000643A1
WO2022000643A1 PCT/CN2020/104508 CN2020104508W WO2022000643A1 WO 2022000643 A1 WO2022000643 A1 WO 2022000643A1 CN 2020104508 W CN2020104508 W CN 2020104508W WO 2022000643 A1 WO2022000643 A1 WO 2022000643A1
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WO
WIPO (PCT)
Prior art keywords
pole core
linear vibration
coil assembly
hole
vibration motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/104508
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English (en)
French (fr)
Inventor
陶峰
凌芳华
浦晓峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AAC Technologies Holdings Shenzhen Co Ltd
AAC Microtech Changzhou Co Ltd
Original Assignee
AAC Acoustic Technologies Shenzhen Co Ltd
AAC Microtech Changzhou Co Ltd
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Filing date
Publication date
Application filed by AAC Acoustic Technologies Shenzhen Co Ltd, AAC Microtech Changzhou Co Ltd filed Critical AAC Acoustic Technologies Shenzhen Co Ltd
Publication of WO2022000643A1 publication Critical patent/WO2022000643A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/34—Reciprocating, oscillating or vibrating parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/02—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs

Definitions

  • the present invention relates to the field of vibration motors, in particular to a linear vibration motor used in portable consumer electronic products.
  • a linear vibration motor includes a casing, a coil assembly housed in the casing, a vibration unit, and an elastic support for supporting the vibration unit.
  • the vibration unit includes a mass block with a receiving hole and a magnet fixed on the hole wall of the receiving hole.
  • Circuit structure, the coil assembly interacts with the magnetic circuit structure to drive the vibration unit to vibrate along the length direction of the housing, and the magnetic circuit structure includes a pole core fixed on the hole wall, a first magnet fixed on the pole core facing the coil assembly side, The second pole core of the second hole wall and the magnetic steel fixed on the side of the second pole core facing the coil assembly, wherein the pole core is in the shape of a flat plate.
  • the pole core and the pole core are positioned with the mass block through their own shape matching. Positioning in this way will easily lead to low positioning accuracy of the pole core and the pole core of the assembled linear vibration motor.
  • the concentricity of the magnet is not high.
  • the purpose of the invention is to provide a linear vibration motor, which can improve the positioning accuracy of the pole core, reduce the difficulty of process assembly, and improve the concentricity between the magnet and the pole core.
  • the linear vibration motor provided by the present invention includes a casing, a coil assembly accommodated in the casing, a vibration unit and an elastic support for supporting the vibration unit, the casing has a bottom plate for fixing the coil assembly, and the vibration unit It includes a mass block with a receiving hole and a magnetic circuit structure fixed in the receiving hole and formed with a magnetic gap at intervals.
  • the coil assembly is located in the magnetic gap and interacts with the magnetic circuit structure to drive the vibration.
  • the unit vibrates along a vibration direction parallel to the bottom plate
  • the mass block includes a hole wall surrounding the receiving hole and an outer surface opposite to the hole wall
  • the magnetic circuit structure includes a wall attached to the hole
  • the pole core of the wall and the magnetic steel attached to the pole core and opposite to the coil assembly, the pole core includes a flat part that is flatly attached to the side of the magnetic steel away from the coil assembly, the flat Positioning grooves are provided at opposite ends of the portion along a direction parallel to the bottom plate, and the positioning grooves are close to the bottom plate.
  • the mass further includes a groove recessed from the hole wall to the outer surface, the groove includes a bottom wall parallel to the outer surface and connecting the bottom wall and the hole wall the side wall, the flat part is flat on the bottom wall.
  • the pole core further includes bent portions that are bent and extended from opposite ends of the flat portion close to the side wall to the coil assembly, respectively, the bent portions are flat against the side wall and It does not extend beyond the groove.
  • the pole core further includes an extension portion bent and extended from the bending portion along the hole wall, and the extension portion is flatly attached to the hole wall.
  • the bent portion is perpendicular to the flat portion and the extension portion.
  • the hole walls include a pair of first hole walls spaced along the short axis side of the mass block and a pair of second hole walls spaced along the long axis side of the mass block, a pair of the The first hole walls are respectively recessed with the grooves, the pole cores are respectively accommodated in a pair of the grooves, and the long axis edge of the mass block extends along the vibration direction.
  • the pole core is stamped and formed by a magnetic conductive plate.
  • the coil assembly includes a core body and a coil wound around the outer periphery of the core body, and the axis of the coil extends along the vibration direction.
  • the core body includes a main body and fixed ends fixed on both ends of the main body, the coil is wound on the main body, and the fixed ends are fixed on the bottom plate.
  • the core body is an iron core.
  • the linear vibration motor provided by the present invention is provided with a positioning groove on the pole core, and when assembling, a positioning tool is inserted into the positioning groove to realize the positioning between the pole core and the mass block, thereby improving the performance of the linear vibration motor.
  • FIG. 1 is a perspective exploded schematic diagram of Embodiment 1 of the linear vibration motor provided by the present invention.
  • FIG. 2 is a partially exploded schematic view of the linear vibration motor shown in FIG. 1 .
  • FIG. 3 is a perspective view of the linear vibration motor shown in FIG. 1 after being assembled.
  • FIG. 4 is a cross-sectional view of the linear vibration motor shown in FIG. 3 taken along line A-A.
  • FIG. 5 is a schematic structural diagram of a mass block in the linear vibration motor shown in FIG. 4 .
  • FIG. 6 is a cross-sectional view of the linear vibration motor shown in FIG. 3 taken along line B-B.
  • FIG. 7 is a schematic structural diagram of Embodiment 2 of the linear vibration motor provided by the present invention.
  • FIG. 8 is a schematic structural diagram of Embodiment 2 of the linear vibration motor provided by the present invention.
  • the linear vibration motor includes a housing 1 , a coil assembly 2 accommodated in the housing 1 , a vibration unit 3 and an elastic support 4 supporting the vibration unit 3 .
  • the casing 1 is rectangular, and the casing 1 includes a casing 11 and a bottom plate 13 assembled with the casing 11 to form a receiving space 1B.
  • the coil assembly 2 is fixed to the bottom plate 13 .
  • the coil assembly 2 includes a core body 21 and a coil 23 wound around the outer circumference of the core body 21 , wherein the axis direction of the coil 23 is the vibration direction of the vibration unit 3 , and the vibration direction is related to the base plate. 13 parallel.
  • the core body 21 may be in the shape of a column or an "I" shape.
  • the core body 21 is “I”-shaped, and includes a main body portion 211 and fixed ends 213 fixed on both ends of the main body portion 211 , and the coil 23 is wound around the main body portion. 211 , the coil assembly 2 is fixed on the base plate 13 through the fixed end 213 .
  • the core body 21 is an iron core. After the coil 23 is energized, the core 21 is magnetized by the magnetic field of the coil 23, the magnetized core 21 becomes a magnet, and the magnetic field of the magnet and the magnetic field of the coil 23 are superimposed on each other, so that the The magnetic force of the coil assembly 2 increases.
  • the coil 23 is electrically connected to an external power source through the circuit board 5 .
  • the circuit board 5 is fixed on the bottom plate 13 , and one end of the circuit board 5 extends out of the receiving space 1B to be electrically connected to an external circuit.
  • the vibration unit 3 includes a mass block 31 with a receiving hole 3A and a magnetic circuit structure 33 fixed in the receiving hole 3A and formed with a magnetic gap 3B at intervals.
  • the magnetic circuit structures 33 interact to drive the vibration unit 3 to vibrate along the vibration direction.
  • the mass block 31 includes a hole wall 35 surrounding the receiving hole 3A, an outer surface 37 opposite to the hole wall 35 , and a groove 39 recessed from the hole wall 35 to the outer surface 37 .
  • the hole wall 35 includes a pair of first hole walls 351 spaced along the short axis side of the mass block 31 and a pair of second hole walls 353 spaced along the long axis side of the mass block 31 , wherein, The long axis of the mass 31 extends along the vibration direction. As shown in FIG. 5 , the grooves 39 are formed on a pair of the first hole walls 351 , respectively.
  • the groove 39 includes a bottom wall 391 parallel to the outer surface 37 and a side wall 393 connecting the bottom wall 391 and the hole wall 35 .
  • the side wall 393 connects the bottom wall 391 and the first hole wall 351 .
  • the magnetic circuit structure 33 includes a pole core 331 attached to the hole wall 35 and a magnetic steel 333 attached to the pole core 331 and opposite to the coil assembly 2 .
  • the four pole cores 331 there are four pole cores 331 , and the four pole cores 331 are a pair of first pole cores 331 a and a pair of first pole cores 331 a spaced along the short axis of the mass block 31 , respectively.
  • a pair of second pole cores 331b are arranged at intervals along the long axis of the mass block 31, wherein the groove 39 accommodates the first pole cores 331a.
  • the first pole core 331a and the second pole core 331b both include a flat portion 335 that is flatly attached to the side of the magnetic steel 333 away from the coil assembly 2, and the flat portion 335 is flatly attached to the bottom wall. 391 , and two opposite ends of the flat portion 335 along a direction parallel to the bottom plate 13 are provided with positioning grooves a, and the positioning grooves a are close to the bottom plate 13 .
  • the first pole core 331a further includes a bending portion 337 extending from the opposite ends of the flat portion 335 close to the hole wall 35 toward the coil assembly 2 , and a bending portion 337 extending from the bending portion 337 along the line.
  • the extension portion 339 of the hole wall 35 is bent and extended.
  • the bent portion 337 is flat against the side wall 393 and does not extend beyond the groove 39.
  • the extension portion 339 is flat against the hole wall 35 of the first hole wall 351.
  • the bent portion 337 is perpendicular to the flat portion 335 and the extension portion 339 .
  • the pole core 331 is stamped and formed by a magnetic conductive plate.
  • the four magnetic steels 333 are respectively a pair of first magnetic steels 333 a spaced along the short axis of the mass block 31 and along the long axis of the mass block 31 .
  • a pair of second magnets 333b arranged at intervals.
  • the polarity direction of the first magnetic steel 333a is arranged along the short axis of the mass block 31, and the polar directions of the two first magnetic steels 333a are opposite.
  • the core body 21 has two magnetic poles (N pole and S pole) distributed along the long axis of the mass block 31 (ie, the vibration direction), so that the coil assembly 2 and the magnetic circuit structure 33 can be connected.
  • the first magnetic steel 333a interacts to drive the vibration unit 3 to vibrate along the vibration direction;
  • the polarity direction of the second magnetic steel 333b is along the long axis of the mass block 31 (that is, the vibration direction), and the two second magnetic steels 333b are opposite to each other with the same pole, so that the coil assembly 2 and the first magnetic steel 333a and the second magnetic steel 333b of the magnetic circuit structure 33 can be connected Interact to achieve fast response of the vibration motor.
  • the side of the first magnet 333a close to the first pole core 331a is the S pole, and the side close to the coil assembly 2 is the N pole;
  • the second magnet 333b is close to the One side of the second pole core 331b is the N pole, and the side close to the coil assembly 2 is the S pole.
  • the second hole wall 353 can also be recessed to form the groove, and further, the second pole core 331b can also be configured to include a flat portion 335, a bent portion 337 and extension 339.
  • the elastic support members 4 are respectively provided on opposite sides of the vibration unit 3 along its vibration direction.
  • the elastic supports 4 are U-shaped springs, and the opening directions of the two elastic supports 4 are opposite to each other.
  • the elastic support member 4 includes a first fixing portion 41 connected with the mass block 311 , a second fixing portion 43 connected with the housing 1 , and connecting the first fixing portion 41 and the second fixing portion 43 .
  • the deformation portion 45 of the second fixing portion 43 and the first fixing portion 41 are arranged at intervals along the short axis side of the mass block 31 .
  • a buffer sheet 6 is provided between the first fixing portion 41 and the casing 1 and between the second fixing portion 43 and the mass block 31 .
  • the buffer sheet 6 can be made of foam, rubber, silicon or the like. The buffer sheet 6 can prevent the elastic support 4 from colliding with the housing 1 and the mass 31 of the vibration unit 3 during the vibration of the vibration unit 3 , thereby improving the reliability of the product.
  • FIG. 7 is a schematic structural diagram of the linear vibration motor 200 in the second embodiment.
  • the second embodiment is basically the same as the first embodiment, and the meanings of the symbols in the following list are also the same as those in the first embodiment. Therefore, the same parts will not be repeated here, and the following only List the differences.
  • the first pole core 331a only includes a flat portion 335 and a bent portion 337 extending from opposite ends of the flat portion 335 close to the hole wall 35 toward the coil assembly 2 , respectively. , excluding extensions.
  • the third embodiment is basically the same as the first embodiment, and the meanings of the symbols in the following list are also the same as those in the first embodiment. Therefore, the same parts will not be repeated here. List the differences.
  • the first pole core 331a only includes the flat portion 335, but does not include the bent portion and the extension portion.
  • the pole core is set to include a flat part part 335 and the bending part 337 extending from the opposite ends of the flat part 335 close to the hole wall 35 to the coil assembly 2 respectively, that is, through the bending process of the pole core 331, the pole core 331 can be bent.
  • the magnetic induction intensity of the core 331 at the flat part 335 near the bent part 337 and the bent part 337 is increased (that is, the magnetic flux in the magnetic gap 3B can be enhanced by the bending of the pole core 331 ), so that the transient state can be improved.
  • the pole core of the first embodiment is further bent and extended from the bending part 337 to form an extension part 339 , and the arrangement of the extension part 339 can further improve the magnetic flux in the magnetic gap 3B , therefore, relative to the linear vibration motor of the second embodiment, the linear vibration motor of the first embodiment has a shorter starting and braking time; on the other hand, relative to the vibration unit of the first embodiment (the vibration unit includes a pole core),
  • the acceleration root mean square value (Grms) of the vibration unit (the vibration unit includes the pole core) is larger, and the acceleration root mean square value (Grms) mainly affects the steady-state performance of the linear vibration motor.
  • the acceleration root mean square value (Grms) The larger the value of , the stronger the vibration sense of the linear vibration motor. Therefore, compared with the linear vibration motor of the first embodiment, the vibration sense of the linear vibration motor of
  • a positioning groove a is provided on the pole core 331, and during assembly, a positioning tool is inserted into the positioning groove a to realize the positioning between the pole core and the mass block, so that the positioning of the pole core can be improved. Accuracy, ease of process assembly and improved concentricity of magnets and pole cores.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

本发明提供了一种线性振动电机，其包括外壳、线圈组件、振动单元及弹性支撑件，外壳具有底板，振动单元包括具有收容孔的质量块及固定于收容孔并且间隔设置形成有磁间隙的磁路结构，线圈组件位于磁间隙内并与磁路结构相互作用以驱动振动单元沿平行于底板的振动方向振动，质量块包括围设成收容孔的孔壁及与孔壁相对的外表面，磁路结构包括贴设于孔壁的极芯和贴设于极芯且与线圈组件相对设置的磁钢，极芯包括平贴于磁钢远离线圈组件一侧的平坦部，平坦部沿平行于底板方向上的相对两端设置有定位槽，且定位槽靠近底板。与相关技术相比，本发明提供的线性振动电机可以提高极芯的定位精度、降低过程装配难度及提高磁体和极芯的同心度。

Description

线性振动电机 技术领域
本发明涉及振动电机领域，尤其涉及一种用于便携式消费性电子产品上的线性振动电机。
 背景技术
随着电子技术的发展，便携式消费性电子产品越来越受人们的欢迎，如手机、掌上游戏机、导航装置或掌上多媒体娱乐设备等，这些电子产品一般都会用到振动电机来做系统反馈，比如手机的来电提示、信息提示、导航提示、游戏机的振动反馈等。
相关技术中，线性振动电机包括外壳以及收容于外壳内的线圈组件、振动单元及支撑振动单元的弹性支撑件，振动单元包括具有收容孔的质量块及固设于收容孔的孔壁上的磁路结构，线圈组件与磁路结构相互作用以驱动振动单元沿外壳的长度方向振动，磁路结构包括固定于孔壁的极芯、固定于极芯朝向线圈组件一侧的第一磁体、固定于第二孔壁的第二极芯以及固定于第二极芯朝向线圈组件一侧的磁钢，其中，极芯呈平板状。然而，此种线性振动电机组装过程中，极芯和极芯均与质量块通过自身形状配合定位，以这种定位方式定位易导致极芯定位精度低以及组装后的线性振动电机的极芯与磁体的同心度不高的问题。
因此，实有必要提供一种新的线性振动电机解决上述问题。
 技术问题
发明的目的在于提供一种线性振动电机，该线性振动电机可以提高极芯的定位精度、降低过程装配难度及提高磁体和极芯的同心度。
 技术解决方案
本发明提供的线性振动电机，包括外壳以及收容于所述外壳内的线圈组件、振动单元及支撑所述振动单元的弹性支撑件，所述外壳具有固定所述线圈组件的底板，所述振动单元包括具有收容孔的质量块及固定于所述收容孔并且间隔设置形成有磁间隙的磁路结构，所述线圈组件位于所述磁间隙内并与所述磁路结构相互作用以驱动所述振动单元沿平行于所述底板的振动方向振动，所述质量块包括围设成所述收容孔的孔壁及与所述孔壁相对的外表面，所述磁路结构包括贴设于所述孔壁的极芯和贴设于所述极芯且与所述线圈组件相对设置的磁钢，所述极芯包括平贴于所述磁钢远离所述线圈组件一侧的平坦部，所述平坦部沿平行于所述底板方向上的相对两端设置有定位槽，且所述定位槽靠近所述底板。
优选地，所述质量块还包括自所述孔壁向所述外表面凹陷的凹槽，所述凹槽包括与所述外表面平行相对的底壁以及连接所述底壁和所述孔壁的侧壁，所述平坦部平贴于所述底壁。
优选地，所述极芯还包括自所述平坦部靠近所述侧壁的相对两端分别向所述线圈组件弯折延伸的折弯部，所述折弯部平贴于所述侧壁且其延伸不超出所述凹槽。
优选地，所述极芯还包括自所述折弯部沿着所述孔壁弯折延伸的延伸部，所述延伸部平贴于所述孔壁。
优选地，所述折弯部与所述平坦部和所述延伸部垂直。
优选地，所述孔壁包括沿所述质量块的短轴边间隔设置的一对第一孔壁以及沿所述质量块的长轴边间隔设置的一对第二孔壁，一对所述第一孔壁上分别凹陷形成有所述凹槽，一对所述凹槽内分别收容有所述极芯，所述质量块的长轴边沿所述振动方向延伸。
优选地，所述极芯由导磁板冲压成型。
优选地，所述线圈组件包括芯体及绕设于所述芯体外周的线圈，所述线圈的轴线沿所述振动方向延伸。
优选地，所述芯体包括主体部及固设于所述主体部的两端的固定端，所述线圈设于缠绕在所述主体部上，所述固定端固定在所述底板上。
优选地，所述芯体为铁芯。
 有益效果
与相关技术相比，本发明提供的线性振动电机通过在在所述极芯上设置定位槽，组装时，定位工装插入所述定位槽以实现极芯和质量块之间的定位，从而可以提高极芯的定位精度、降低过程装配难度及提高磁体和极芯的同心度。
 附图说明
图1为本发明提供的线性振动电机实施例一的立体分解示意图。
图2为图1所示线性振动电机的部分分解示意图。
图3为图1所示线性振动电机组装后的立体图。
图4为图3所示线性振动电机沿A-A线的剖视图。
图5为图4所示线性振动电机中质量块的结构示意图。
图6为图3所示线性振动电机沿B-B线的剖视图。
图7为本发明提供的线性振动电机实施例二的结构示意图。
图8为本发明提供的线性振动电机实施例二的结构示意图。
 本发明的实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部份实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例一
如图1至图6所示，所述线性振动电机包括外壳1以及收容于所述外壳1内的线圈组件2、振动单元3及支撑所述振动单元3的弹性支撑件4。
所述外壳1呈矩形，所述外壳1包括壳体11及与所述壳体11组配形成收容空间1B的底板13。所述线圈组件2固定于所述底板13。
所述线圈组件2包括芯体21及绕设于所述芯体21外周的线圈23，其中，所述线圈23的轴线方向为所述振动单元3的振动方向，所述振动方向与所述底板13平行。
所述芯体21可以为柱状，也可以为“工”字形。在本实施例中，所述芯体21为“工”字形，其包括主体部211及固设于所述主体部211的两端的固定端213，所述线圈23设于缠绕在所述主体部211上，所述线圈组件2通过所述固定端213固定在所述底板13上。
在本实施例中，所述芯体21为铁芯。所述线圈23通电后，所述芯体21被所述线圈23的磁场磁化，磁化后的所述芯体21变成一个磁体，该磁体的磁场与所述线圈23的磁场相互叠加，从而使得所述线圈组件2的磁力增加。
所述线圈23通过电路板5与外部电源电连接。如图3和图6所示，所述电路板5固定在所述底板13上，且其一端延伸出所述收容空间1B以与外部电路电连接。
所述振动单元3包括具有收容孔3A的质量块31及固定于所述收容孔3A并且间隔设置形成有磁间隙3B的磁路结构33，所述线圈组件2位于所述磁间隙3B内并与所述磁路结构33相互作用以驱动所述振动单元3沿所述振动方向振动。
所述质量块31包括围设成所述收容孔3A的孔壁35、与所述孔壁35相对的外表面37及自所述孔壁35向所述外表面37凹陷形成的凹槽39。
所述孔壁35包括沿所述质量块31的短轴边间隔设置的一对第一孔壁351以及沿所述质量块31的长轴边间隔设置的一对第二孔壁353，其中，所述质量块31的长轴边沿所述振动方向延伸。如图5所示，一对所述第一孔壁351上分别凹陷形成有所述凹槽39。
所述凹槽39包括与所述外表面37平行相对的底壁391以及连接所述底壁391和所述孔壁35的侧壁393。具体地，所述侧壁393连接所述底壁391和所述第一孔壁351。
所述磁路结构33包括贴设于所述孔壁35的极芯331和贴设于所述极芯331且与所述线圈组件2相对设置的磁钢333。
如图1和图4所示，所述极芯331设有四个，四个所述极芯331分别为沿所述质量块31的短轴边间隔设置的一对第一极芯331a以及沿所述质量块31的长轴边间隔设置的一对第二极芯331b，其中，所述凹槽39收容所述第一极芯331a。通过在所述孔壁35上设置配合所述极芯331的所述凹槽39，不仅可以在保证磁路性能的情况下，降低零部件（极芯和磁钢）的装配难度以及提升装配精度，而且在不牺牲收容孔容积的情况下，可以拓宽质量块31的壁厚和增加质量块31重量，从而可以降低质量块31跌落时出现断裂的风险。
所述第一极芯331a和所述第二极芯331b均包括平贴于所述磁钢333远离所述线圈组件2一侧的平坦部335,所述平坦部335平贴于所述底壁391，且所述平坦部335沿平行于所述底板13方向上的相对两端设置有定位槽a，且所述定位槽a靠近所述底板13。
所述第一极芯331a还包括自所述平坦部335靠近所述孔壁35的相对两端分别向所述线圈组件2弯折延伸的折弯部337及自所述折弯部337沿着所述孔壁35弯折延伸的延伸部339，所述折弯部337平贴于所述侧壁393且其延伸不超出所述凹槽39，所述延伸部339平贴于所述孔壁35的所述第一孔壁351。
如图4所示，所述折弯部337与所述平坦部335和所述延伸部339垂直。
在本实施例中，所述极芯331由导磁板冲压成型。
所述磁钢333设有四个，四个所述磁钢333分别为沿所述质量块31的短轴边间隔设置的一对第一磁钢333a以及沿所述质量块31的长轴边间隔设置的一对第二磁钢333b。
其中，所述第一磁钢333a的极性方向沿所述质量块31的短轴边设置，且两个所述第一磁钢333a的极性方向相反，在所述线圈23通电时，所述芯体21具有沿所述质量块31的长轴边（即所述振动方向）分布的两个磁极（N极和Ｓ极），从而可使得所述线圈组件2与所述磁路结构33的所述第一磁钢333a相互作用以驱动所述振动单元3沿所述振动方向振动；所述第二磁钢333b的极性方向沿所述质量块31的长轴边（即所述振动方向）设置，且两个所述第二磁钢333b同极相对设置，从而可使得所述线圈组件2与所述磁路结构33的所述第一磁钢333a和所述第二磁钢333b相互作用以实现振动电机的快速反应。如图4所示，所述第一磁钢333a靠近所述第一极芯331a的一侧为Ｓ极，其靠近所述线圈组件2的一侧为Ｎ极；所述第二磁钢333b靠近所述第二极芯331ｂ的一侧为Ｎ极，其靠近所述线圈组件2的一侧为Ｓ极。
可以理解的是，在其他实施方式中，所述第二孔壁353上也可以凹陷形成所述凹槽，进一步地，所述第二极芯331b也可以设置成包括平坦部335、折弯部337及延伸部339。
所述振动单元3沿其振动方向的相对两侧分别设有所述弹性支撑件4。所述弹性支撑件4为U型弹簧，且两个所述弹性支撑件4的开口方向相对设置。
所述弹性支撑件4包括与所述质量块311连接的第一固定部41、与所述外壳1连接的第二固定部43及连接所述第一固定部41和所述第二固定部43的形变部45，所述第二固定部43与所述第一固定部41沿所述质量块31的短轴边间隔设置。
所述第一固定部41与所述外壳1之间以及所述第二固定部43与所述质量块31之间设有缓冲片6。其中，所述缓冲片6可以采用泡棉、橡胶、硅等制成。所述缓冲片6可以防止所述振动单元3在振动过程中所述弹性支撑件4与所述外壳1和所述振动单元3的所述质量块31发生碰撞，从而提高产品的可靠性。
实施例二
图7是实施例二中线性振动电机200的结构示意图，实施例二与实施例一基本相同，以下列表中符号含义与实施例一也相同，故对于相同的部分此处不再赘述，以下仅列出不同点。
在本实施例中，所述第一极芯331a仅包括平坦部335及自所述平坦部335靠近所述孔壁35的相对两端分别向所述线圈组件2弯折延伸的折弯部337，而不包括延伸部。
实施例三。
图8是实施例三中线性振动电机300的结构示意图，实施例三与实施例一基本相同，以下列表中符号含义与实施例一也相同，故对于相同的部分此处不再赘述，以下仅列出不同点。
在本实施例中，所述第一极芯331a仅包括平坦部335，而不包括折弯部和延伸部。
需要说明的是，相对于实施例三中的所述第一极芯331a（所述第一极芯331a仅包括平坦部335），实施例一和实施例二均通过将极芯设置成包括平坦部335、自所述平坦部335靠近所述孔壁35的相对两端分别向所述线圈组件2弯折延伸的折弯部337，即通过所述极芯331折弯处理可以使得所述极芯331在平坦部335于折弯部337附近以及所述折弯部337的磁感应强度增大（即通过所述极芯331折弯处理可以增强磁间隙3B内的磁通量），从而可以提高瞬态振动性能（磁通量越大，振动单元启动及刹车时间越短）。其中，相对于实施例二的极芯，实施例一的极芯还自所述折弯部337弯折延伸形成有延伸部339，所述延伸部339的设置可以进一步提高磁间隙3B内的磁通量，因此，相对于实施例二的线性振动电机，实施例一的线性振动电机启动及刹车时间更短；另一方面，相对于实施例一的振动单元（振动单元包括极芯），实施例二的振动单元（振动单元包括极芯）的加速度均方根值(Grms) 更大，加速度均方根值(Grms) 的大小主要影响线性振动电机的稳态性能，加速度均方根值(Grms) 的越大，线性振动电机的振感越强，因此，相对于实施例一的线性振动电机，实施例二的线性振动电机振感更强。
本发明提供的线性振动电机通过在所述极芯331上设置定位槽a，组装时，定位工装插入所述定位槽a以实现极芯和质量块之间的定位，从而可以提高极芯的定位精度、降低过程装配难度及提高磁体和极芯的同心度。
以上所述的仅是本发明的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出改进，但这些均属于本发明的保护范围。

Claims (10)

  1. 一种线性振动电机，包括外壳以及收容于所述外壳内的线圈组件、振动单元及支撑所述振动单元的弹性支撑件，所述外壳具有固定所述线圈组件的底板，所述振动单元包括具有收容孔的质量块及固定于所述收容孔并且间隔设置形成有磁间隙的磁路结构，所述线圈组件位于所述磁间隙内并与所述磁路结构相互作用以驱动所述振动单元沿平行于所述底板的振动方向振动，所述质量块包括围设成所述收容孔的孔壁及与所述孔壁相对的外表面，所述磁路结构包括贴设于所述孔壁的极芯和贴设于所述极芯且与所述线圈组件相对设置的磁钢，其特征在于：所述极芯包括平贴于所述磁钢远离所述线圈组件一侧的平坦部，所述平坦部沿平行于所述底板方向上的相对两端设置有定位槽，且所述定位槽靠近所述底板。
  2. 根据权利要求1所述的线性振动电机，其特征在于：所述质量块还包括自所述孔壁向所述外表面凹陷的凹槽，所述凹槽包括与所述外表面平行相对的底壁以及连接所述底壁和所述孔壁的侧壁，所述平坦部平贴于所述底壁。
  3. 根据权利要求2所述的线性振动电机，其特征在于：所述极芯还包括自所述平坦部靠近所述侧壁的相对两端分别向所述线圈组件弯折延伸的折弯部，所述折弯部平贴于所述侧壁且其延伸不超出所述凹槽。
  4. 根据权利要求3所述的线性振动电机，其特征在于：所述极芯还包括自所述折弯部沿着所述孔壁弯折延伸的延伸部，所述延伸部平贴于所述孔壁。
  5. 根据权利要求4所述的线性振动电机，其特征在于：所述折弯部与所述平坦部和所述延伸部垂直。
  6. 根据权利要求2-5中任一项所述的线性振动电机，其特征在于：所述孔壁包括沿所述质量块的短轴边间隔设置的一对第一孔壁以及沿所述质量块的长轴边间隔设置的一对第二孔壁，一对所述第一孔壁上分别凹陷形成有所述凹槽，一对所述凹槽内分别收容有所述极芯，所述质量块的长轴边沿所述振动方向延伸。
  7. 根据权利要求3-5中任一项所述的线性振动电机，其特征在于：所述极芯由导磁板冲压成型。
  8. 根据权利要求1所述的线性振动电机，其特征在于：所述线圈组件包括芯体及绕设于所述芯体外周的线圈，所述线圈的轴线沿所述振动方向延伸。
  9. 根据权利要求8所述的线性振动电机，其特征在于：所述芯体包括主体部及固设于所述主体部的两端的固定端，所述线圈设于缠绕在所述主体部上，所述固定端固定在所述底板上。
  10. 根据权利要求8或9所述的线性振动电机，其特征在于：所述芯体为铁芯。
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