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WO2018166090A1 - Moteur à vibration linéaire - Google Patents

Moteur à vibration linéaire Download PDF

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Publication number
WO2018166090A1
WO2018166090A1 PCT/CN2017/089387 CN2017089387W WO2018166090A1 WO 2018166090 A1 WO2018166090 A1 WO 2018166090A1 CN 2017089387 W CN2017089387 W CN 2017089387W WO 2018166090 A1 WO2018166090 A1 WO 2018166090A1
Authority
WO
WIPO (PCT)
Prior art keywords
vibration motor
vibrator
coil
housing
linear vibration
Prior art date
Application number
PCT/CN2017/089387
Other languages
English (en)
Chinese (zh)
Inventor
朱跃光
孙长军
Original Assignee
歌尔股份有限公司
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 歌尔股份有限公司 filed Critical 歌尔股份有限公司
Publication of WO2018166090A1 publication Critical patent/WO2018166090A1/fr

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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
    • H02K33/12—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moving in alternate directions by alternate energisation of two coil systems
    • 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 present invention relates to the field of vibration device technology, and more particularly to a linear vibration motor.
  • a miniature vibration motor is generally used for system feedback.
  • the incoming call alert of the mobile phone the vibration feedback of the gaming machine, and the like.
  • the vibration direction of the vibration motor is generally along the horizontal long axis direction.
  • the long axis direction is the extending direction of the long side of the vibration motor.
  • Such a vibration motor generally includes a vibrator assembly and a metal dome housed in a housing.
  • a metal dome is used to suspend the magnetic vibrator within the housing.
  • the metal shrapnel not only provides a restoring force to the vibrator assembly, but also provides a supporting force for suspending the vibrator assembly in the space.
  • the magnetic circuit of the long-axis direction vibration motor is mostly vertically magnetized, and the magnetization direction is perpendicular to the coil, thereby forming a long-axis direction driving force.
  • the short axis direction is the extending direction of the short side of the vibration motor.
  • F Lorentz force formula
  • B magnetic induction intensity
  • I current magnitude
  • L wire length
  • the vibration component in the vibration motor also uses a metal piece having a higher density, and a larger mass can provide a higher vibration.
  • the mass block in order to accommodate the magnetic circuit system and the vibration space, the mass block will reserve a lot of escape grooves, so that a mass of a large mass cannot be obtained, and the groove has a low strength. The mass is difficult to form and is easy to break.
  • a linear vibration motor includes a housing, a vibrator, a coil, and an elastic member, the housing having a cavity, the vibrator, the coil and the elastic member are disposed in the cavity, and the vibrator passes through the elastic member Suspended in the cavity, the vibrator includes a permanent magnet and a weight portion connected together, a long side of the permanent magnet and a long side of the coil are parallel to a long axis direction, respectively, and both are short The sides are respectively parallel to the short axis direction, the permanent magnets are plural and the magnetization direction is parallel to the short axis direction, and adjacent sides of the plurality of permanent magnets have the same polarity, and the long sides of the coil are The gaps between the adjacent permanent magnets are opposed to cause the vibrator to vibrate in the short axis direction.
  • the number of the coils is two, and the permanent magnets are two, and the adjacent long sides of the two coils are opposite to the gap between the two permanent magnets, and two of the long The sides have the same current direction.
  • adjacent long sides of the two coils are symmetrically disposed with respect to a center line of the gap.
  • the housing has a first raised portion, and the coil is disposed on the first raised portion.
  • the pole core is two, the coil is disposed around the pole core, and the two are in one-to-one correspondence, the shell is made of a magnetic conductive material, each of the A pole core is coupled to the housing to magnetize a sidewall of the housing adjacent the pole core, the sidewall forming a magnetic force with the permanent magnet.
  • the permanent magnet is embedded in the weight portion.
  • the weight portion is provided with a groove, and the permanent magnet is disposed in the groove, and a reinforcing rib is arranged between the adjacent grooves.
  • a second protrusion is disposed on the wall of the weight portion perpendicular to the vibration direction, and one end of the elastic element is connected to the second protrusion.
  • a third protrusion is disposed on the wall of the housing perpendicular to the vibration direction, and the other end of the elastic element is coupled to the third protrusion.
  • the elastic element is a spring piece
  • the elastic piece includes a first connecting portion for connecting with the housing, a second connecting portion for connecting with the vibrator, and a middle portion between the first connecting portion and the second connecting portion.
  • a spring arm which is in the form of a straight piece.
  • the inventors of the present invention have found that in the prior art, the linear vibration motors each vibrate in the long axis direction, limited by the size in the short axis direction, and the driving force is limited. Therefore, the technical task to be achieved by the present invention or the technical problem to be solved is not thought of or expected by those skilled in the art, so the present invention is a new technical solution.
  • FIG. 1 is an exploded view of a linear vibration motor in accordance with one embodiment of the present invention.
  • FIG. 2 is an assembled view of a stator and a lower case in accordance with one embodiment of the present invention.
  • FIG 3 is a cross-sectional view of a linear vibration motor in accordance with one embodiment of the present invention.
  • FIG. 4 is a schematic structural view of a shrapnel according to an embodiment of the present invention.
  • Figure 5 is a block diagram showing the structure of a mass in accordance with one embodiment of the present invention.
  • Figure 6 is a schematic view showing the structure of an upper case in accordance with one embodiment of the present invention.
  • Fig. 7 is a schematic structural view of a linear vibration motor in which a lower case is not mounted, according to an embodiment of the present invention.
  • Figure 8 is a schematic view showing the structure of a linear vibration motor in which a lower case is not mounted, according to another embodiment of the present invention.
  • 11 upper shell; 12: third boss; 13: mass; 14: groove; 15: shrapnel; 16: permanent magnet; 17: pole core; 18: coil; 19: FPCB; 20: lower shell; 21: first raised portion; 22: first connecting portion; 23: second connecting portion; 24: first side wall; 25: second side wall; 26: long side of the coil; 27: short side of the coil; 28: long side of the permanent magnet; 29: short side of the permanent magnet; 30: elastic arm; 31: reinforcing rib.
  • a linear vibration motor is provided.
  • the vibration motor can be used in electronic devices such as mobile phones, game machines, notebook computers, wearable devices, walkie-talkies, and the like.
  • the vibration motor includes a housing, a vibrator, a coil 18, and a resilient member.
  • the housing has a cavity.
  • the vibrator, coil 18 and spring element are disposed within the cavity.
  • the vibrator is suspended in the cavity by a resilient element.
  • the elastic member may be, but not limited to, a resilient piece 15, an elastic rubber member, a spring, or the like.
  • the vibrator includes a permanent magnet 16 and a weight portion that are coupled together.
  • the permanent magnet 16 is used to form a magnetic field.
  • the permanent magnet 16 is a ferrite magnet or a neodymium iron boron magnet.
  • the weight portion is used to increase the inertia of the vibrator to enhance the vibration.
  • the long side 28 of the permanent magnet and the long side 26 of the coil are respectively parallel to the long axis direction, and the short side 27 of the coil and the short side 29 of the permanent magnet are respectively parallel to the short axis direction.
  • the long axis direction is the extending direction of the long side of the linear vibration motor
  • the short axis direction is the extending direction of the short side of the linear vibration motor.
  • the permanent magnets 16 are plural and the magnetization direction is parallel to the short axis direction.
  • the magnetization direction of the permanent magnet 16 is parallel to the coil 18.
  • Adjacent sides of the plurality of permanent magnets 16 have the same polarity.
  • the isotropic repulsion causes the adjacent permanent magnets 16 to form a hedging structure, and the magnetic field direction of the gap of the adjacent permanent magnets 16 is perpendicular to the coil 18.
  • the long side 26 of the coil opposes the gap between adjacent permanent magnets 16 to cause the vibrator to vibrate in the short axis direction.
  • the two gaps of 16 are oppositely arranged to drive the vibrator with three permanent magnets 16 to vibrate.
  • one of the long sides of the coil 18 opposes the gap of the adjacent two permanent magnets 16 to drive the vibrator with the two permanent magnets 16 to vibrate.
  • the long side 28 of the permanent magnet and the long side 26 of the coil are parallel to the long axis direction, respectively, and the short sides of the both are parallel to the short axis direction, and the vibrator vibrates in the short axis direction.
  • the lengths of the permanent magnets 16 and the coils 18 are not limited by the housing, and the user can set the lengths of the two according to actual needs, thereby increasing the driving force of the linear vibration motor, shortening the response time, and improving the vibration of the linear vibration motor.
  • the number of the permanent magnets 16 is plural and the magnetization direction of the permanent magnets 16 is parallel to the short-axis direction, which can effectively increase the magnetic field strength and further increase the driving force.
  • the weight portion does not need to be designed to avoid the processing difficulty, and the mass 13 is easy to obtain a large mass, and the vibration of the linear vibration motor is improved.
  • FIG. 1 is an exploded view of a linear vibration motor in accordance with one embodiment of the present invention.
  • 3 is a cross-sectional view of a linear vibration motor in accordance with one embodiment of the present invention.
  • the housing includes an upper case 11 and a lower case 20.
  • the upper case 11 and the lower case 20 are fastened together to form a cavity inside them.
  • the housing is provided in a rectangular parallelepiped shape.
  • the cross section of the housing may be an approximately rectangular parallelepiped shape, such as an elliptical shape, a racetrack shape, or the like, as long as it has opposing major and minor axes.
  • the material of the housing may be, but not limited to, metal, plastic, ceramic, and the like.
  • the linear vibration motor further includes a pole core 17 disposed around the pole core 17.
  • the pole core 17 is capable of gathering magnetic lines of inductance.
  • the housing has a first raised portion 21, and the coil 18 is disposed on the first raised portion 21.
  • the lower case 20 protrudes into the cavity to form the first boss portion 21.
  • the coil 18 is disposed on the first boss portion 21 by bonding. In this way, the gap between the permanent magnet 16 and the coil 18 is smaller, enabling more magnetic lines to pass through the coil 18. Thereby increasing the size of the Lorentz force.
  • the elastic member is a spring piece 15.
  • the elastic piece 15 includes a first connecting portion 22 for connecting with the housing, a second connecting portion 23 for connecting with the vibrator, and a spring arm 30 located between the first connecting portion 22 and the second connecting portion 23, and the elastic arm 30 is Straight sheet.
  • the straight-shaped elastic arm 30 reduces the manufacturing difficulty of the elastic piece 15, and the structural strength of the elastic piece 15 is high.
  • the elastic piece 15 does not need to be bent, which reduces the damage during the processing and improves the service life.
  • the size of the elastic piece 15 in the axial direction is not limited and can have a larger length.
  • the stress and resonance frequency of the elastic piece 15 are low.
  • a person skilled in the art can set the thickness of the elastic piece 15 according to actual conditions.
  • the elastic piece 15 is located between the vibrator and the side wall of the upper case 11 to provide the vibrator with an elastic restoring force in the short-axis direction.
  • the number of the elastic pieces 15 is two, and the vibrator is located between the two elastic pieces 15. The vibrator is suspended above the coil 18 by two springs 15.
  • the second convex portion is provided on the wall of the weight portion perpendicular to the vibration direction, and one end of the elastic member is connected to the second convex portion.
  • the provision of the second raised portion provides a space for the connection of the elastic elements.
  • the second connecting portion 23 is welded to the second raised portion by welding.
  • a third raised portion 12 is provided on the wall of the housing perpendicular to the direction of vibration, and the other end of the resilient member is coupled to the third raised portion 12.
  • the provision of the third raised portion 12 provides space for the connection of the resilient elements.
  • a third boss portion 12 is provided on both the first side wall 24 and the second side wall 25 in the direction of the extension axis.
  • the third raised portion 12 is convex toward the cavity.
  • the first connecting portion 22 of the elastic piece 15 is welded to the third convex portion 12.
  • the third convex portion 12 can avoid the violent collision of the elastic piece 15 with the first side wall 24 and the second side wall 25 in the vibration process and the drop test to reduce the vibration noise of the vibration motor and improve the vibration of the elastic piece 15. reliability.
  • the elastic pieces 15 are two.
  • the first connecting portion 22 of each of the elastic pieces 15 is at a set angle to the elastic arm 30, for example, 90°.
  • the elastic piece 15 is L-shaped.
  • the first connecting portion 22 is welded to the side wall of the upper casing 11 in the short-axis direction.
  • the elastic piece 15 occupies in the direction along the short axis The space used is reduced, which increases the vibration space of the vibrator.
  • the permanent magnet 16 is embedded in the weight portion.
  • the weight portion is the mass 13 .
  • the mass 13 is made of tungsten steel.
  • the weight portion is provided with a recess 14 in which the permanent magnet 16 is disposed. In this way, it is possible to prevent the permanent magnets 16 from protruding out of the mass 13, reducing the volume of the vibrators, and reducing or even avoiding collision of the permanent magnets 16 with other components.
  • reinforcing ribs 31 are provided between adjacent grooves 14 to improve the overall strength of the mass 13 and to prevent breakage or failure of the mass 13 during the forming and dropping tests.
  • the mass 13 can be integrally formed by pouring.
  • the rib 31 and the groove 14 are simultaneously cast. In this way, the mass 13 can have a higher structural strength.
  • the adjacent long sides of the two coils 18 are symmetrically disposed with respect to the centerline of the gap.
  • the two permanent magnets 16 are of the same type, and the magnetic lines of interest of the two adjacent permanent magnets 16 respectively form two closed magnetic circuits.
  • the long side 26 of the coil is symmetrically disposed with respect to the centerline of the gap.
  • the linear vibration motor also includes a pole core 17.
  • the pole core 17 is used to gather the magnetic field generated by the energized coil 18 to increase the magnetic field strength.
  • the casing is made of a magnetically permeable material, for example, the upper casing 11 and the lower casing 20 are made of SUS-430.
  • Each pole core 17 is coupled to the housing to magnetize a sidewall of the housing adjacent the pole core 17, and a magnetic force is formed between the sidewall and the permanent magnet 16.
  • the polarity of the housing is the same as the polarity of the end of the pole core 17 that is connected to the housing.
  • the adjacent side of the two permanent magnets 16 is an N pole, and the direction of the magnetic field is perpendicular to the coil 18 downward.
  • the two long sides of the two coils 18 cut the magnetic line of inductance.
  • the coil 18 is subjected to a Lorentz force to the right, and the vibrator is subjected to a reaction force F to the left.
  • the currents of the two coils 18 are opposite in direction.
  • the lower end of the right pole core 17 is an S pole, and since the second side wall 25 is close to the pole core 17, it is magnetized to the S pole; the lower end of the pole core 17 on the left side is the N pole, due to the first The side wall 24 is close to the pole core and is magnetized to the N pole.
  • the permanent magnet 16 on the right side is subjected to the repulsive force of the second side wall 25, and the force is to the left.
  • the permanent magnet 16 on the left side is subjected to the attraction of the first side wall 24, which is directed to the left. Both forces are generated simultaneously.
  • the vibrator is subjected to the "electromagnetic force" F' of the shell wall.
  • the reaction force F of the coil 18 and the "electromagnetic force" F' of the casing wall are in the same direction, which together constitute the driving force of the vibrator vibration.
  • the driving force of the linear vibration motor is greatly improved, the response time of the vibration motor is effectively shortened, and the vibration feeling is improved.

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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

L'invention concerne un moteur à vibration linéaire, comprenant un boîtier, un vibreur, une bobine (18) et un élément élastique. Le boîtier comporte une cavité, le vibreur, la bobine (18) et l'élément élastique, qui est disposé à l'intérieur de la cavité. Le vibreur est suspendu à l'intérieur de la cavité par l'élément élastique, et le vibreur comprend un aimant permanent (16) et un poids d'équilibrage reliés l'un à l'autre. Le côté plus long de l'aimant permanent (16) et le côté plus long de la bobine (18) sont respectivement parallèles à la direction d'un axe principal, et les côtés plus courts des deux sont respectivement parallèles à la direction d'un axe secondaire. Il y a une pluralité d'aimants permanents (16), et la direction de magnétisation est parallèle à la direction de l'axe secondaire. Les côtés adjacents de la pluralité d'aimants permanents (16) ont la même polarité, et le côté plus long de la bobine (18) fait face à un espace entre des aimants permanents adjacents (16), de telle sorte que le vibreur vibre dans la direction de l'axe secondaire. Le moteur de vibration a un temps de réponse court et l'expérience de l'utilisateur de vibration est bonne.
PCT/CN2017/089387 2017-03-13 2017-06-21 Moteur à vibration linéaire WO2018166090A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710147453.0 2017-03-13
CN201710147453.0A CN107070159B (zh) 2017-03-13 2017-03-13 线性振动马达

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WO2018166090A1 true WO2018166090A1 (fr) 2018-09-20

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WO (1) WO2018166090A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106953492B (zh) * 2017-03-23 2020-02-18 歌尔股份有限公司 线性振动马达
CN208479444U (zh) * 2017-12-21 2019-02-05 四川安和精密电子电器有限公司 一种振动电机
CN110957881A (zh) * 2019-12-26 2020-04-03 浙江省东阳市东磁诚基电子有限公司 一种低漏磁的水平线性马达及其实现方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07169074A (ja) * 1993-12-14 1995-07-04 Hitachi Metals Ltd 駆動装置
CN101488697A (zh) * 2009-02-20 2009-07-22 瑞声声学科技(深圳)有限公司 扁平线性振动电机
CN102035345A (zh) * 2010-12-17 2011-04-27 歌尔声学股份有限公司 扁平线性振动器
CN204928524U (zh) * 2015-07-30 2015-12-30 瑞声光电科技(常州)有限公司 振动电机
CN205231986U (zh) * 2015-07-31 2016-05-11 歌尔声学股份有限公司 线性振动电机
CN106169855A (zh) * 2016-08-22 2016-11-30 歌尔股份有限公司 纵向振动马达

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8013699B2 (en) * 2002-04-01 2011-09-06 Med-El Elektromedizinische Geraete Gmbh MRI-safe electro-magnetic tranducer
CN201789401U (zh) * 2010-09-01 2011-04-06 歌尔声学股份有限公司 扁平线性振动器
CN204597754U (zh) * 2015-05-07 2015-08-26 歌尔声学股份有限公司 扁平线性马达
CN205178826U (zh) * 2015-11-25 2016-04-20 歌尔声学股份有限公司 线性振动马达

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07169074A (ja) * 1993-12-14 1995-07-04 Hitachi Metals Ltd 駆動装置
CN101488697A (zh) * 2009-02-20 2009-07-22 瑞声声学科技(深圳)有限公司 扁平线性振动电机
CN102035345A (zh) * 2010-12-17 2011-04-27 歌尔声学股份有限公司 扁平线性振动器
CN204928524U (zh) * 2015-07-30 2015-12-30 瑞声光电科技(常州)有限公司 振动电机
CN205231986U (zh) * 2015-07-31 2016-05-11 歌尔声学股份有限公司 线性振动电机
CN106169855A (zh) * 2016-08-22 2016-11-30 歌尔股份有限公司 纵向振动马达

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CN107070159A (zh) 2017-08-18

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