WO2021237786A1 - Moteur électrique à vibration linéaire - Google Patents

Moteur électrique à vibration linéaire Download PDF

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Publication number
WO2021237786A1
WO2021237786A1 PCT/CN2020/094694 CN2020094694W WO2021237786A1 WO 2021237786 A1 WO2021237786 A1 WO 2021237786A1 CN 2020094694 W CN2020094694 W CN 2020094694W WO 2021237786 A1 WO2021237786 A1 WO 2021237786A1
Authority
WO
WIPO (PCT)
Prior art keywords
iron core
magnetic steel
vibration
magnet
vibration motor
Prior art date
Application number
PCT/CN2020/094694
Other languages
English (en)
Chinese (zh)
Inventor
崔志勇
马杰
王尧
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 WO2021237786A1 publication Critical patent/WO2021237786A1/fr

Links

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
    • 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

Definitions

  • the utility model relates to a vibration motor, in particular to a linear vibration motor used for portable consumer electronic products.
  • vibration motors for system feedback, such as mobile phones. Incoming call reminder, information reminder, navigation reminder, vibration feedback of game console, etc.
  • vibration motor to have high performance, good stability and long service life.
  • a related-art linear vibration motor includes a housing having a housing space, a vibration unit placed in the housing space, an elastic member that suspends the vibration unit in the housing space, and a housing fixed to the housing.
  • dual voice coil components are often arranged symmetrically up and down on both sides of the vibration unit along the direction perpendicular to the vibration, but At the same time, it also brings problems such as complicated circuit connection and large space occupation.
  • the linear vibration motor of the related art realizes the damping of the vibration unit by adding damping materials such as magnetic fluid or damping foam, but the temperature characteristics of the magnetic fluid or damping foam are poor.
  • the damping material is easy to fail and the damping cannot be adjusted, resulting in failure of the linear vibration motor and poor reliability.
  • a linear vibration motor includes both a voice coil assembly that provides driving force for the vibration unit and a self-conducting voice coil assembly that provides damping force for the vibration unit.
  • this double The structure of the voice coil assembly makes the circuit connection of the entire linear vibration motor complicated and takes up a large space, which increases the weight and volume of the entire linear vibration motor, so that the linear vibration motor has a very limited space perpendicular to the vibration direction. Conducive to its design.
  • the purpose of the utility model is to provide a linear vibration motor with simple structure and good reliability.
  • the present invention provides a linear vibration motor, which includes a housing with a housing space, a vibration unit placed in the housing space, and elasticity for suspending the vibration unit in the housing space. And a coil assembly that is fixed to the housing and drives the vibration unit to vibrate, the vibration unit includes a magnetic steel assembly housed in the accommodating space; the coil assembly is located along the vibration unit perpendicular to the vibration On one side of the direction, the coil assembly includes a first iron core fixed to the housing and a coil wound around the first iron core, and the first iron core is opposite to the magnetic steel assembly;
  • the linear vibration motor also includes a second iron core fixed to the housing and a metal sheet stacked on a side of the second iron core close to the magnetic steel component.
  • the second iron core is connected to the first iron core.
  • the core is arranged on opposite sides of the magnetic steel assembly; the metal sheet is located in the magnetic field of the magnetic steel assembly, and when the vibration unit vibrates, the metal sheet generates a damping force that hinders the vibration of the vibration unit.
  • the metal sheet is a copper sheet.
  • the magnetizing direction of the magnetic steel component is perpendicular to the vibration direction.
  • the vibration unit further includes a mass with a through hole, and the magnetic steel component is fixed in the through hole.
  • the magnetic steel component includes a first magnetic steel, a second magnetic steel, and a third magnetic steel that are spaced apart from each other and arranged in sequence along the vibration direction.
  • the polarities are opposite, the first magnetic steel and the third magnetic steel have the same polarity; the coil assembly is set as two spaced apart from each other along the vibration direction, and neither of the coil assemblies is connected to The first magnet or the second magnet or the third magnet is arranged directly opposite to each other.
  • the mass includes a first groove and a second groove formed along opposite sides perpendicular to the vibration direction in the direction of the magnetic steel component, and the through hole is formed by the first groove.
  • the metal sheet is at least partially received in the first recess, and the coil component is at least partially received in the second recess.
  • the linear vibration motor further includes a bracket located in the first groove and covering the through hole, and the magnetic steel component is fixedly connected to the bracket.
  • the coil assembly further includes a magnetic conductive sheet disposed on a side of the first iron core away from the magnetic steel assembly, and the first iron core is fixed to the housing through the magnetic conductive sheet.
  • the elastic pieces are arranged as two respectively located at opposite ends of the vibration unit along the vibration direction, and the two elastic pieces are arranged symmetrically; each of the elastic pieces includes an elastic arm, The opposite ends of the elastic arm are respectively a first connecting arm and a second connecting arm that are bent and extended in the same direction; the elastic arm and the mass are spaced apart, and the first connecting arm is fixedly connected to the mass The second connecting arm is fixedly connected to the housing.
  • the linear vibration motor further includes at least two first reinforcing blocks and two second reinforcing blocks, each of the first reinforcing blocks is located on a side of each of the first connecting arms away from the mass block So that the first connecting arm is fixed to the mass; each second reinforcing block is located on the side of each second connecting arm away from the housing so that the second connecting arm is fixed to The housing.
  • the coil assembly is located on one side of the vibration unit perpendicular to the vibration direction.
  • the circuit design provided to the coil is simpler, and at the same time
  • the volume of the entire linear vibration motor is saved, the space utilization rate is better, the mass of the entire linear vibration motor is reduced, and the structure is simple.
  • the second iron core is located on the side of the metal sheet away from the magnetic steel assembly, the metal sheet generates a damping force that hinders the vibration of the vibration unit, and the second iron core guides the magnetic field lines of the magnetic steel assembly to pass through the metal sheet , So that the eddy current damping force generated by the metal sheet due to the cutting of the magnetic lines of force is improved, and the reliability is better; at the same time, the second iron core and the first iron core are arranged on opposite sides of the vibration unit, that is, this
  • the structure enables the second iron core to form an attractive force on the magnetic steel assembly perpendicular to the vibration direction, which overcomes the attractive force of the first iron core on the magnetic steel assembly.
  • the force is relatively balanced or small, and the force applied along the direction perpendicular to the vibration direction can be ignored, so that the vibration effect of the linear vibration motor is better.
  • Figure 1 is a schematic diagram of the three-dimensional structure of the linear vibration motor of the utility model
  • Figure 2 is an exploded schematic diagram of the linear vibration motor of the utility model
  • Fig. 3 is a cross-sectional view along A-A of Fig. 1.
  • the present invention provides a linear vibration motor 100, which includes a housing 1 with a housing space 10, a vibration unit placed in the housing space 10, and the vibration unit 2
  • the elastic member 3 suspended in the receiving space 10, the coil assembly 4 fixed to the housing 1 and driving the vibration unit 2 to vibrate, the second iron core 5, the metal sheet 6, the bracket 7 and the first reinforcement Block 8 and second reinforcement block 9.
  • the housing 1 includes an upper housing 11 and a lower housing 12 covering the upper housing 11.
  • the upper housing 11 and the lower housing 12 jointly enclose a receiving space 10.
  • the vibration unit 2 includes a mass 21 with a through hole 210 and a magnetic steel assembly 22 housed in the receiving space 10. Specifically, the magnetic steel component 22 is fixed in the through hole 210 and the magnetizing direction is perpendicular to the vibration direction.
  • the mass 21 includes a first groove 211 and a second groove 212 recessed in the direction of the magnetic steel assembly 22 along opposite sides perpendicular to the vibration direction.
  • the through hole 210 is formed by the first groove.
  • the groove 211 penetrates to the second groove 212 to be formed.
  • the magnetic steel assembly 22 includes a first magnetic steel 221, a second magnetic steel 222, and a third magnetic steel 223 which are spaced apart from each other and arranged in sequence along the vibration direction.
  • the coil assembly 4 is located on one side of the vibration unit 2 perpendicular to the vibration direction. At this time, the circuit design provided to the coil assembly 4 is simpler, and at the same time, the volume and space of the entire linear vibration motor 100 are saved. The utilization rate is better, and the mass of the entire linear vibration motor 100 is reduced. Specifically, the coil assembly 4 is at least partially housed in the second groove 212 to further reduce the occupied space of the linear vibration motor along the direction perpendicular to the vibration direction.
  • each coil assembly 4 is provided in two and arranged at intervals along the vibration direction.
  • Each coil assembly 4 includes a first iron core 41 fixed to the housing 1, a coil 42 wound around the first iron core, and a first iron core 41 far away from the magnetic steel assembly 22.
  • the magnetic conductive sheet 43 on the side, the first iron core 41 is fixed to the lower housing 12 through the magnetic conductive sheet 43.
  • an ampere force in the vibration direction is formed in the magnetic field generated by the magnetic steel assembly 22 to drive the vibration unit 2 to vibrate and produce a vibration effect; at the same time, the coil 42 after energization makes the first iron core 41 magnetize, so that all The first iron core 41 and the adjacent magnetic steel component 22 have the same or opposite polarity, forming an electromagnetic force that attracts or repels each other.
  • the polarities of the first magnet 221 and the second magnet 222 are opposite, and the polarities of the first magnet 221 and the third magnet 223 are the same. None of the coil assemblies 4 is arranged directly opposite to the first magnet 221, the second magnet 222, or the third magnet 223; that is, one of the coil assemblies 4 faces the magnet.
  • the orthographic projection of the steel component 22 falls into the first magnetic steel 221 and the second magnetic steel 222 at the same time, and the orthographic projection of the other coil component 4 to the magnetic steel component 22 falls into the second magnetic steel component 22 at the same time.
  • FIG. 3 is taken as an example for further description.
  • the magnetizing directions of the first magnet 221, the second magnet 222, and the third magnet 223 are shown in FIG. 3.
  • the upper ends of the first magnet 221 and the third magnet 223 are both S poles, and the lower ends are N poles.
  • the upper end of the second magnet is the N pole, and the lower end is the S pole; the coil assembly 4 on the left is energized to make the first iron core 41 magnetize, at this time the upper end of the first iron core 41 is the S pole, and the lower end is N Therefore, the first iron core 41 on the left and the first magnet 221 form an attractive electromagnetic force.
  • the first iron core 41 is magnetized. At this time, the upper end of the first iron core 41 is the N pole and the lower end is the S pole, so the first iron core 41 on the right and the third magnet 223 are formed Repulsive electromagnetic force.
  • the electromagnetic forces on the left and right sides of the coil assembly 4 alternately attract and repel each other.
  • the second iron core 5 shown is fixed to the housing 1, and the second iron core 5 and the first iron core 41 are arranged on opposite sides of the magnetic steel assembly 22.
  • This structure enables the second iron core 5 to form an attractive force on the magnetic steel assembly 22 along the direction perpendicular to the vibration direction, which overcomes the attractive force of the first iron core 41 on the magnetic steel assembly 22, so that the entire linear vibration motor 100 moves along the vertical direction.
  • the force in the vibration direction is relatively balanced or small, and the force in the direction perpendicular to the vibration direction can be ignored, so that the vibration effect of the linear vibration motor 100 is better.
  • the metal sheet 6 is a copper sheet and is at least partially received in the first groove 211.
  • a damping force that hinders the vibration of the vibration unit 2 is generated.
  • the second iron core 5 because the second iron core 5 is located on the side of the metal sheet 6 away from the magnetic steel assembly 22, the second iron core 5 guides the magnetic field lines of the magnetic steel assembly 22 to pass through the metal sheet 6, so that the metal The eddy current damping force of the sheet 6 due to the cutting of the magnetic lines of force is improved, and the vibration performance of the linear vibration motor 100 is better.
  • the metal sheet 6 generates a damping force that hinders the movement of the vibration unit 2 in the entire magnetic field
  • the second iron core 5 is located in the magnetic field of the magnetic steel assembly 22 to enhance the damping force of the metal sheet 6 so that The vibration performance of the linear vibration motor 100 is better.
  • the linear vibration motor 100 further includes a bracket 7 located in the first groove 211 and covering the through hole 210, and the magnetic steel component 22 is fixedly connected to the bracket 7 for better reliability.
  • the mass 21 includes a first groove 211 and a second groove that are recessed in the direction of the magnetic steel component 22 along opposite sides perpendicular to the vibration direction.
  • a groove 212, and the through hole 210 is formed from the first groove 211 to the second groove 212.
  • the magnetic steel component 22 is located in the through hole 210
  • the bracket 7 is located in the first groove 211 and covers the through hole 210
  • the metal sheet 6 is at least partially received in the first groove 211
  • the coil component 4 is at least Partly received in the second groove 212.
  • a first groove 211 is provided on the mass block 21 to accommodate the bracket 7 and an escape space for the metal sheet 6 is formed, and a second groove 212 is opened on the mass block 21 to form an escape space for the coil assembly 4 to ensure the quality 21.
  • the bracket 7, the coil assembly 4 and the metal sheet 6 can be reasonably housed in the linear vibration motor, and the space utilization rate is high.
  • each component is located inside the linear vibration motor 100 In different spaces, if one of the components falls during transportation, other components will not be affected, and the reliability is higher.
  • the elastic member 3 is provided in two. Two elastic members 3 are respectively arranged at opposite ends of the vibration unit 2 along the vibration direction, and the two elastic members 3 are arranged symmetrically. That is to say, the double elastic member structure makes the vibration effect of the linear vibration motor 100 more balanced, and the vibration effect is better; each elastic member 3 includes an elastic arm 31, and the opposite ends of the elastic arm 31 are respectively bent in the same direction
  • the first connecting arm 32 and the second connecting arm 33 extend; the elastic arm 31 is spaced apart from the mass block 21, the first connecting arm 32 is fixedly connected to the mass block 21, and the second connecting arm 33 and the housing 1 are fixedly connected. That is, the elastic member 3 suspends the vibration unit 2 in the containing space 10 to provide vibration conditions for the vibration unit 2.
  • Each of the first reinforcement block 8 and the second reinforcement block 9 includes at least two, and each of the first reinforcement blocks 8 is located on the side of each of the first connecting arms 32 away from the mass block 21 so that the first A connecting arm 32 is fixed to the mass block 21; each of the second reinforcing blocks 9 is located on the side of each of the second connecting arms 33 away from the housing 1 to fix the second connecting arms 33 In the case 1, the reliability is better.
  • the coil assembly is located on one side of the vibration unit perpendicular to the vibration direction.
  • the circuit design provided to the coil is simpler, and at the same time
  • the volume of the entire linear vibration motor is saved, the space utilization rate is better, the mass of the entire linear vibration motor is reduced, and the structure is simple.
  • the second iron core is located on the side of the metal sheet away from the magnetic steel assembly, the metal sheet generates a damping force that hinders the vibration of the vibration unit, and the second iron core guides the magnetic field lines of the magnetic steel assembly to pass through the metal sheet , So that the eddy current damping force generated by the metal sheet due to the cutting of the magnetic lines of force is improved, and the reliability is better; at the same time, the second iron core and the first iron core are arranged on opposite sides of the vibration unit, that is, this
  • the structure enables the second iron core to form an attractive force on the magnetic steel assembly perpendicular to the vibration direction, which overcomes the attractive force of the first iron core on the magnetic steel assembly.
  • the force is relatively balanced or small, and the force applied along the direction perpendicular to the vibration direction can be ignored, so that the vibration effect of the linear vibration motor is better.

Landscapes

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

Abstract

La présente invention concerne un moteur électrique à vibration linéaire (100), comprenant un boîtier (1) avec un espace de réception (10), une unité de vibration (2) disposée dans l'espace de réception, un élément élastique (3), un ensemble bobine (4), un second noyau de fer (5) et des feuilles métalliques (6), l'unité de vibration comprenant un ensemble d'acier magnétique (22) ; l'ensemble bobine étant positionné sur un côté de l'unité de vibration dans une direction perpendiculaire à la direction de vibration, et comprenant un premier noyau de fer (41) fixé sur le boîtier et une bobine (42) enroulée autour du premier noyau de fer, et le premier noyau de fer étant situé à l'opposé de l'ensemble d'acier magnétique ; et les feuilles métalliques étant empilées sur un côté du second noyau de fer à proximité de l'ensemble d'acier magnétique, le second noyau de fer et le premier noyau de fer étant disposés sur deux côtés opposés de l'ensemble d'acier magnétique, les feuilles métalliques étant positionnées dans un champ magnétique de l'ensemble d'acier magnétique, et lorsque l'unité de vibration vibre, les feuilles métalliques étant utilisées pour générer une force d'amortissement afin d'empêcher la vibration de l'unité de vibration. Le moteur électrique à vibration linéaire a une structure simple et plus fiable.
PCT/CN2020/094694 2020-05-27 2020-06-05 Moteur électrique à vibration linéaire WO2021237786A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202020924310.3 2020-05-27
CN202020924310.3U CN212811536U (zh) 2020-05-27 2020-05-27 线性振动电机

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Publication Number Publication Date
WO2021237786A1 true WO2021237786A1 (fr) 2021-12-02

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PCT/CN2020/094694 WO2021237786A1 (fr) 2020-05-27 2020-06-05 Moteur électrique à vibration linéaire

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WO (1) WO2021237786A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112865468B (zh) * 2021-03-31 2022-05-13 歌尔股份有限公司 线性振动马达
CN215498695U (zh) * 2021-08-16 2022-01-11 歌尔股份有限公司 线性振动马达

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3605125B2 (ja) * 1993-08-09 2004-12-22 三菱重工業株式会社 リニアモータ式制振装置
CN102035340A (zh) * 2009-09-29 2011-04-27 三星电机株式会社 振动电机
CN207339617U (zh) * 2017-08-30 2018-05-08 瑞声科技（南京）有限公司 线性振动电机
CN207603420U (zh) * 2017-11-17 2018-07-10 瑞声科技（南京）有限公司 线性振动电机
CN208063027U (zh) * 2018-04-12 2018-11-06 四川安和精密电子电器有限公司 线性振动电机及振动设备
CN210350990U (zh) * 2019-04-25 2020-04-17 瑞声科技(新加坡)有限公司 线性振动电机

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3605125B2 (ja) * 1993-08-09 2004-12-22 三菱重工業株式会社 リニアモータ式制振装置
CN102035340A (zh) * 2009-09-29 2011-04-27 三星电机株式会社 振动电机
CN207339617U (zh) * 2017-08-30 2018-05-08 瑞声科技（南京）有限公司 线性振动电机
CN207603420U (zh) * 2017-11-17 2018-07-10 瑞声科技（南京）有限公司 线性振动电机
CN208063027U (zh) * 2018-04-12 2018-11-06 四川安和精密电子电器有限公司 线性振动电机及振动设备
CN210350990U (zh) * 2019-04-25 2020-04-17 瑞声科技(新加坡)有限公司 线性振动电机

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