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WO2020140533A1 - 线性振动电机 - Google Patents

线性振动电机 Download PDF

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Publication number
WO2020140533A1
WO2020140533A1 PCT/CN2019/110615 CN2019110615W WO2020140533A1 WO 2020140533 A1 WO2020140533 A1 WO 2020140533A1 CN 2019110615 W CN2019110615 W CN 2019110615W WO 2020140533 A1 WO2020140533 A1 WO 2020140533A1
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WO
WIPO (PCT)
Prior art keywords
side wall
pole core
vibration motor
fixed
linear vibration
Prior art date
Application number
PCT/CN2019/110615
Other languages
English (en)
French (fr)
Inventor
凌芳华
陶锋
浦晓峰
石梦珣
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 (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 瑞声声学科技(深圳)有限公司, 瑞声科技(新加坡)有限公司 filed Critical 瑞声声学科技(深圳)有限公司
Publication of WO2020140533A1 publication Critical patent/WO2020140533A1/zh

Links

Classifications

    • 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
    • H02K33/18—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/04—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism
    • B06B1/045—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism using vibrating magnet, armature or coil system
    • 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
    • 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
    • H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system

Definitions

  • the utility model relates to a motor, in particular to a linear vibration motor used in the field of mobile electronic products.
  • the related art linear vibration motor includes a base with an accommodation space, a vibration unit located in the accommodation space, an elastic member that fixes and suspends the vibration unit in the accommodation space, and a coil assembly fixed to the base ,
  • the vibration unit includes a mass, pole core, and magnetic steel, and the coil assembly includes a coil and an iron core, and the magnetic field generated by the coil interacts with the magnetic field generated by the vibration unit, thereby driving the vibration unit to do The reciprocating linear motion generates vibration.
  • the thickness of the pole core is substantially the same, and the thickness of the iron core is also substantially the same.
  • the magnetic field generated by the coil is concentratedly blocked by magnetic field lines in the magnetic field of the pole core and the iron core, weakening the strength of the magnetic field, causing the vibration unit to weaken the vibration, thereby affecting the vibration performance of the linear vibration motor Get worse.
  • the purpose of the utility model is to provide a linear vibration motor with good vibration performance.
  • the present invention provides a linear vibration motor, which includes a base with a receiving space, a vibrating unit placed in the receiving space, an elastic member suspending the vibrating unit in the receiving space, and A coil assembly fixed to the base and driving the vibration unit to vibrate;
  • the vibration unit includes a mass with a through hole, a pole core accommodated in the through hole, and fixed on opposite sides of the pole core Magnetic steel,
  • the pole core includes a first side wall disposed oppositely spaced and a second side wall disposed oppositely spaced, the magnetic steel is fixed to the first side wall, the thickness of the second side wall is greater than The thickness of the first side wall.
  • the first side wall is arranged parallel to the long axis direction of the pole core, and the second side wall is arranged parallel to the short axis direction of the pole core.
  • the base includes an upper cover connected with the elastic member and a bottom plate fixedly formed with the upper cover to form the receiving space
  • the coil assembly includes an insert in the through hole and is connected to the magnetic
  • An iron core provided at intervals in the steel and a coil wound around the iron core, the iron core is fixed to the bottom plate.
  • the mass is made of non-magnetic material.
  • the pole core of the linear vibration motor of the present invention includes a first side wall and a second side wall, wherein the magnetic steel is fixed to the first side wall; and the pole core
  • the thickness of the second side wall increases, that is, the thickness of the second side wall is greater than the thickness of the first side wall.
  • Figure 1 is a perspective structural view of a linear vibration motor of the present invention
  • Figure 3 is a cross-sectional view taken along line A-A in Figure 1;
  • the utility model provides a linear vibration motor 100 including a base 1, a vibration unit 2, an elastic member 3 and a coil assembly 4.
  • the base 1 has a receiving space 10.
  • the base 1 includes a bottom plate 11 and an upper cover 12 that covers the bottom plate 11 and forms a receiving space 10 together with the bottom plate 11.
  • the vibration unit 2 is placed in the storage space 10.
  • the vibration unit 2 is supported and suspended in the accommodation space 10 by the elastic member 3.
  • the vibration unit 2 includes a mass 21, a pole core 22, and a magnetic steel 23.
  • the mass 21 includes a through hole 210 and a hole wall 211 surrounding the through hole 210.
  • the mass 21 is made of non-magnetic material.
  • the pole core 22 is rectangular.
  • the pole core 22 is received in the through hole 210.
  • the pole core 22 is fixed to the hole wall 211.
  • the pole core 22 includes a first side wall 221 opposite and spaced apart and a second side wall 222 opposite and spaced apart.
  • the first side wall 221 is disposed parallel to the long axis direction of the pole core 22, and the second side wall 222 is disposed parallel to the short axis direction of the pole core 22.
  • the magnetic steel 23 includes two, and the two magnetic steels 23 are disposed on opposite sides of the pole core 22. That is, the two magnetic steels 23 are fixed on opposite sides of the pole core 22.
  • the first side wall 221 includes two
  • the second side wall 222 includes two. The two magnetic steels 23 are respectively fixed to the two first side walls 221.
  • the thickness of the second side wall 222 that is, the second side wall 222 is increased where the magnetic field lines are concentratedly blocked, that is, the second side wall 222 Has a thickness greater than that of the first side wall 221.
  • the elastic member 3 suspends the vibration unit 2 in the receiving space 10. Specifically, one end of the elastic member 3 is fixed to the vibration unit 2, and the other end is fixed to the base 1. Specifically, the elastic member 3 is connected to the upper cover 12, that is, the elastic member 3 is fixed to the upper cover 12 of the base 1.
  • the coil assembly 4 is fixed to the base 1 and drives the vibration unit 2 to vibrate.
  • the coil assembly 4 extends between the two magnetic steels 23 and is spaced apart from the magnetic steels 23.
  • the coil assembly 4 includes an iron core 41 inserted into the through hole 210 and spaced apart from the magnetic steel 23 and a coil 42 wound around the iron core 41.
  • the iron core 41 includes an iron core body 411 extending in the vibration direction and an iron core extension 412 extending from opposite ends of the iron core body 411 and fixed to the base 1.
  • the coil 42 is wound around the iron core body 411;
  • the iron core extension portion 412 includes a connecting portion 4121 connected to the iron core body 411 and bent and extended by the connecting portion 4121 and fixed to the base
  • the fixing portion 4122 of the seat 1 is fixed to the bottom plate 11.
  • the magnetic field strength be increased by increasing the thickness of the second side wall 222 of the pole core 22. More preferably, in order to increase the magnetic flux of the iron core 41, it is also feasible to increase the thickness of the connecting portion 4121 at the place where the magnetic force lines are concentratedly blocked, that is, the connecting portion 4121. That is, the thickness of the connecting portion 4121 is greater than the thickness of the fixing portion 4122. Therefore, the circulation of magnetic lines of force is increased, the strength of the magnetic field is increased, and the linear vibration motor 100 has good vibration performance.
  • the coil 42 is wound around the iron core body 411 and located between the two magnetic steels 23. After the coil 42 is energized, the iron core 41 forms a magnetic field and interacts with the magnetic field of the magnetic steel 23 to drive the reciprocating linear motion of the vibration unit 2 to produce a vibration effect.
  • the pole core of the linear vibration motor of the present invention includes a first side wall and a second side wall, wherein the magnetic steel is fixed to the first side wall; and the pole core
  • the thickness of the second side wall increases, that is, the thickness of the second side wall is greater than the thickness of the first side wall.

Landscapes

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

Abstract

一种线性振动电机（100），其包括具有收容空间（10）的基座（1）、置于所述收容空间（10）的振动单元（2）、将所述振动单元（2）悬置于所述收容空间（10）的弹性件（3）以及固定于所述基座（1）并驱动所述振动单元（2）振动的线圈组件（4）；所述振动单元（2）包括具有通孔（210）的质量块（21）、收容于所述通孔（210）内的极芯（22）以及固定于所述极芯（22）相对两侧的磁钢（23），所述极芯（22）包括相对间隔设置的第一侧壁（221）和相对间隔设置的第二侧壁（222），所述磁钢（23）固定于所述第一侧壁（221），所述第二侧壁（222）的厚度大于所述第一侧壁（221）的厚度。该线性振动电机（100）的振动性能好。

Description

线性振动电机 技术领域
本实用新型涉及一种电机，尤其涉及一种运用在移动电子产品领域的线性振动电机。
 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追捧，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线性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。如此广泛的应用，就要求振动电机的性能优，使用寿命长。
相关技术的线性振动电机包括具收容空间的基座、位于所述收容空间的振动单元、将所述振动单元固定并悬置于所述收容空间的弹性件和固定于所述基座的线圈组件，所述振动单元包括质量块、极芯及磁钢，所述线圈组件包括线圈和铁芯，通过所述线圈产生的磁场与所述振动单元产生的磁场相互作用，从而驱动所述振动单元做往复直线运动而产生振动。
 技术问题
然而，相关技术的线性振动电机中，所述极芯的厚度基本一致，所述铁芯的厚度也基本一致。所述线圈产生的磁场，在所述极芯和所述铁芯存在磁场中的磁力线集中阻塞，削弱了磁场强度，造成所述振动单元产生振动减弱，从而使所述线性振动电机振动性能受到影响变差。
因此，有必要提供一种新的线性振动电机解决上述问题。
 技术解决方案
本实用新型的目的在于提供一种振动性能好的线性振动电机。
为达到上述目的，本实用新型提供一种线性振动电机，其包括具有收容空间的基座、置于所述收容空间的振动单元、将所述振动单元悬置于所述收容空间的弹性件以及固定于所述基座并驱动所述振动单元振动的线圈组件；所述振动单元包括具有通孔的质量块、收容于所述通孔内的极芯以及固定于所述极芯相对两侧的磁钢，所述极芯包括相对间隔设置的第一侧壁和相对间隔设置的第二侧壁，所述磁钢固定于所述第一侧壁，所述第二侧壁的厚度大于所述第一侧壁的厚度。
优选的，所述第一侧壁平行于所述极芯的长轴方向设置，所述第二侧壁平行于所述极芯的短轴方向设置。
优选的，所述基座包括与所述弹性件连接的上盖以及与所述上盖固定形成所述收容空间的底板，所述线圈组件包括插设于所述通孔内且与所述磁钢间隔设置的铁芯和绕设于所述铁芯的线圈，所述铁芯固定于所述底板。
优选的，所述质量块由非导磁材料制成。
 有益效果
与相关技术相比，本实用新型的线性振动电机的所述极芯包括第一侧壁和第二侧壁，其中，所述磁钢固定于所述第一侧壁；并将所述极芯的所述第二侧壁的厚度增大，即所述第二侧壁的厚度大于所述第一侧壁的厚度。在不影响整体体积情况下，所述线性振动电机通过将所述极芯的局部增大，从而扩大磁力线流通，并提升磁场强度，磁通量相应提升，从而使所述线性振动电机振动性能好。
 附图说明
为了更清楚地说明本实用新型实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本实用新型的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图，其中：
图1为本实用新型线性振动电机的立体结构图；
图2为本实用新型线性振动电机的部分结构图；
图3为沿图1中A-A线的剖示图；
图4为本实用新型线性振动电机的部分结构装配图。
 本发明的实施方式
下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本实用新型的一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，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它实施例，都属于本实用新型保护的范围。
请同时参阅图1-4，本实用新型提供了一种线性振动电机100，其包括基座1、振动单元2、弹性件3以及线圈组件4。
所述基座1具有收容空间10。所述基座1包括底板11和盖设与所述底板11且与所述底板11共同形成收容空间10的上盖12。
所述振动单元2置于所述收容空间10。本实施方式中，所述振动单元2通过所述弹性件3支撑悬置于所述收容空间10内。
具体的，所述振动单元2包括质量块21、极芯22以及磁钢23。
所述质量块21包括通孔210和围设形成所述通孔210的孔壁211。所述质量块21由非导磁材料制成。
所述极芯22呈矩形。所述极芯22收容于所述通孔210内。具体的，所述极芯22固定于所述孔壁211。所述极芯22包括相对且间隔设置的第一侧壁221和相对且间隔设置的第二侧壁222。具体的，所述第一侧壁221平行于所述极芯22的长轴方向设置，所述第二侧壁222平行于所述极芯22的短轴方向设置。
所述磁钢23包括两个，两个所述磁钢23设置于所述极芯22的相对两侧。即两个所述磁钢23固定于所述极芯22相对两侧。具体的，所述第一侧壁221包括两个，所述第二侧壁222包括两个。两个所述磁钢23分别固定于两个所述第一侧壁221。
更优的，为了增加所述极芯22的磁通量，在磁力线集中阻塞处，也就是所述第二侧壁222，增加所述第二侧壁222的厚度，也就是所述第二侧壁222的厚度大于所述第一侧壁221的厚度。从而扩大磁力线流通，提升磁场强度，磁通量相应提升10%左右，使所述线性振动电机100振动性能好。
所述弹性件3将所述振动单元2悬置于所述收容空间10。具体的，所述弹性件3一端固定于所述振动单元2，其另一端固定于所述基座1。具体的，所述弹性件3与所述上盖12连接，即所述弹性件3固定于所述基座1的所述上盖12。
所述线圈组件4固定于所述基座1并驱动所述振动单元2振动。所述线圈组件4延伸至两个所述磁钢23之间且与所述磁钢23间隔设置。
具体的，所述线圈组件4包括插设于所述通孔210内且与所述磁钢23间隔设置的铁芯41和绕设于所述铁芯41的线圈42。
所述铁芯41包括沿所述振动方向延伸的铁芯本体411和由所述铁芯本体411的相对两端延伸且固定于所述基座1的铁芯延伸部412。所述线圈42绕设于所述铁芯本体411；所述铁芯延伸部412包括连接于所述铁芯本体411的连接部4121和由所述连接部4121弯折延伸且固定于所述基座1的固定部4122，所述固定部4122固定于所述底板11。
当然，不仅是可通过增加所述极芯22的所述第二侧壁222的厚度来提升磁场强度。更优的，为了增加所述铁芯41的磁通量，在磁力线集中阻塞处，也就是所述连接部4121，增加所述连接部4121的厚度也是可行的。也就是所述连接部4121的厚度大于所述固定部4122的厚度。从而扩大磁力线流通，提升磁场强度，使所述线性振动电机100振动性能好。
所述线圈42绕设于所述铁芯本体411且位于两个所述磁钢23之间。所述线圈42通电后，所述铁芯41形成磁场并与所述磁钢23的磁场相互作用，从而驱动所述振动单元2往复直线运动，产生振动效果。
与相关技术相比，本实用新型的线性振动电机的所述极芯包括第一侧壁和第二侧壁，其中，所述磁钢固定于所述第一侧壁；并将所述极芯的所述第二侧壁的厚度增大，即所述第二侧壁的厚度大于所述第一侧壁的厚度。在不影响整体体积情况下，所述线性振动电机通过将所述极芯的局部增大，从而扩大磁力线流通，并提升磁场强度，磁通量相应提升，从而使所述线性振动电机振动性能好。
以上所述的仅是本实用新型的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本实用新型创造构思的前提下，还可以做出改进，但这些均属于本实用新型的保护范围。

Claims (4)

  1. 一种线性振动电机，其包括具有收容空间的基座、置于所述收容空间的振动单元、将所述振动单元悬置于所述收容空间的弹性件以及固定于所述基座并驱动所述振动单元振动的线圈组件；所述振动单元包括具有通孔的质量块、收容于所述通孔内的极芯以及固定于所述极芯相对两侧的磁钢，其特征在于，所述极芯包括相对间隔设置的第一侧壁和相对间隔设置的第二侧壁，所述磁钢固定于所述第一侧壁，所述第二侧壁的厚度大于所述第一侧壁的厚度。
  2. 根据权利要求1所述的线性振动电机，其特征在于，所述第一侧壁平行于所述极芯的长轴方向设置，所述第二侧壁平行于所述极芯的短轴方向设置。
  3. 根据权利要求1所述的线性振动电机，其特征在于，所述基座包括与所述弹性件连接的上盖以及与所述上盖固定形成所述收容空间的底板，所述线圈组件包括插设于所述通孔内且与所述磁钢间隔设置的铁芯和绕设于所述铁芯的线圈，所述铁芯固定于所述底板。
  4. 根据权利要求1所述的线性振动电机，其特征在于，所述质量块由非导磁材料制成。
PCT/CN2019/110615 2018-12-30 2019-10-11 线性振动电机 WO2020140533A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201822278807.8 2018-12-30
CN201822278807.8U CN209389915U (zh) 2018-12-30 2018-12-30 线性振动电机

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