WO2022000643A1 - Moteur électrique à vibration linéaire - Google Patents

Moteur électrique à vibration linéaire 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
Authority
WO
WIPO (PCT)
Prior art keywords
pole core
linear vibration
coil assembly
hole
vibration motor
Prior art date
Application number
PCT/CN2020/104508
Other languages
English (en)
Chinese (zh)
Inventor
陶峰
凌芳华
浦晓峰
Original Assignee
瑞声声学科技(深圳)有限公司
瑞声光电科技(常州)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, 瑞声光电科技(常州)有限公司 filed Critical 瑞声声学科技(深圳)有限公司
Publication of WO2022000643A1 publication Critical patent/WO2022000643A1/fr

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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.

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. Le moteur électrique à vibration linéaire comprend un boîtier, un ensemble bobine, une unité de vibration et un élément de support élastique. Le boîtier est pourvu d'une plaque inférieure ; l'unité de vibration comprend un bloc de masse ayant un trou de réception, et une structure de circuit magnétique fixée au trou de réception et agencée à des intervalles pour former des entrefers magnétiques ; l'ensemble bobine est situé dans les entrefers magnétiques et interagit avec la structure de circuit magnétique pour faire vibrer l'unité de vibration dans une direction de vibration parallèle à la plaque inférieure ; le bloc de masse comprend une paroi de trou formant le trou de réception, et une surface externe opposée à la paroi de trou ; la structure de circuit magnétique comprend un noyau polaire fixé à la paroi de trou, et un acier magnétique fixé au noyau polaire et disposé à l'opposé de l'ensemble bobine ; et le noyau polaire comprend une partie plate fixée à plat à un côté de l'acier magnétique à l'opposé de l'ensemble bobine, des rainures de positionnement sont disposées dans deux extrémités opposées de la partie plate dans une direction parallèle à la plaque inférieure, et les rainures de positionnement sont proches de la plaque inférieure. Par rapport à l'état de la technique associé, le moteur électrique à vibration linéaire selon la présente invention peut améliorer la précision de positionnement du noyau polaire, réduire la difficulté d'assemblage de processus et améliorer la concentricité d'un aimant et du noyau polaire.
PCT/CN2020/104508 2020-06-28 2020-07-24 Moteur électrique à vibration linéaire WO2022000643A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202021221436.0U CN212381093U (zh) 2020-06-28 2020-06-28 线性振动电机
CN202021221436.0 2020-06-28

Publications (1)

Publication Number Publication Date
WO2022000643A1 true WO2022000643A1 (fr) 2022-01-06

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PCT/CN2020/104508 WO2022000643A1 (fr) 2020-06-28 2020-07-24 Moteur électrique à vibration linéaire

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WO (1) WO2022000643A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN215580856U (zh) * 2021-06-25 2022-01-18 歌尔股份有限公司 一种线性振动马达
CN218771711U (zh) * 2022-09-09 2023-03-28 瑞声光电科技(常州)有限公司 一种振动激励器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017057193A1 (fr) * 2015-09-28 2017-04-06 日本電産コパル株式会社 Moteur à vibration linéaire
CN208589892U (zh) * 2018-08-03 2019-03-08 瑞声科技（南京）有限公司 振动电机
CN208589897U (zh) * 2018-08-03 2019-03-08 瑞声科技（南京）有限公司 线性振动电机
CN208955872U (zh) * 2018-08-03 2019-06-07 瑞声科技（南京）有限公司 线性振动电机

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017057193A1 (fr) * 2015-09-28 2017-04-06 日本電産コパル株式会社 Moteur à vibration linéaire
CN208589892U (zh) * 2018-08-03 2019-03-08 瑞声科技（南京）有限公司 振动电机
CN208589897U (zh) * 2018-08-03 2019-03-08 瑞声科技（南京）有限公司 线性振动电机
CN208955872U (zh) * 2018-08-03 2019-06-07 瑞声科技（南京）有限公司 线性振动电机

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