WO2022067905A1 - Moteur à vibrations - Google Patents

Moteur à vibrations Download PDF

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Publication number
WO2022067905A1
WO2022067905A1 PCT/CN2020/122342 CN2020122342W WO2022067905A1 WO 2022067905 A1 WO2022067905 A1 WO 2022067905A1 CN 2020122342 W CN2020122342 W CN 2020122342W WO 2022067905 A1 WO2022067905 A1 WO 2022067905A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic steel
magnetic
steel
stator
magnet
Prior art date
Application number
PCT/CN2020/122342
Other languages
English (en)
Chinese (zh)
Inventor
崔志勇
毛路斌
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 WO2022067905A1 publication Critical patent/WO2022067905A1/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

Definitions

  • the present application relates to the technical field of motors, and in particular, to a vibration motor.
  • vibration motors for system feedback, such as incoming calls from mobile phones Prompts, information prompts, navigation prompts, vibration feedback for game consoles, etc.
  • Vibration motor is a device that converts electrical energy into mechanical energy using the principle of electromagnetic force.
  • the elastic member supports the vibrator to reciprocate in the horizontal direction in the housing to generate vibration.
  • the magnetic circuits at both ends of the vibrator and the magnetic conductive material of the stator form a suction force, thereby generating a suction force difference.
  • the direction of the resultant force of the suction force is the same as the direction of movement (+x direction).
  • the direction of the resultant force of the suction force is the same as that of the elastic member.
  • the suction difference of the magnetic circuit will produce negative stiffness to the vibration motor.
  • the purpose of the present application is to provide a vibration motor to reduce the direct force between the magnet and the stator, thereby reducing the negative stiffness of the vibration motor.
  • an embodiment of the present application provides a vibration motor, which includes: a housing with an accommodation space, a stator and a vibrator accommodated in the accommodation space, and a vibrator fixed on the casing and suspended on the vibrator the elastic member of the receiving space;
  • the vibrator includes a counterweight block fixedly connected with the elastic member and having an installation cavity and a magnetic circuit structure accommodated in the installation cavity, the counterweight block includes an inner wall surrounding and forming the installation cavity; the The magnetic circuit structure is fixed on the inner wall;
  • the stator is at least partially accommodated in the installation cavity and is spaced apart from the inner wall;
  • the stator includes an iron core fixed on the casing and wound on the surface of the iron core and disposed opposite to the magnetic circuit structure the coil;
  • the magnetic circuit structure includes a first magnetic steel assembly and a second magnetic steel assembly which are arranged on both sides of the stator along the vibration direction and are symmetrical with respect to the stator.
  • a magnetic conductive sheet is provided on the surface and on the surface of the second magnetic steel assembly facing the stator.
  • the stator further includes a first magnetically conductive pole piece and a second magnetically conductive pole piece respectively fixed on both ends of the iron core.
  • the magnetic circuit structure further includes a third magnetic steel assembly, and the third magnetic steel assembly includes a first magnetic steel located on one side of the coil and opposite to the coil along the vibration direction. and a second magnetic steel located on the other side of the coil perpendicular to the vibration direction and opposite to the coil;
  • the first magnetic steel assembly includes a third magnetic steel arranged on one side of the first magnetic steel along the vibration direction and a fourth magnetic steel arranged on one side of the second magnetic steel along the vibration direction, and the first magnetic steel
  • the three magnetic steels and the fourth magnetic steel are arranged opposite to each other along the direction perpendicular to the vibration direction and both partially overlap with the first magnetic conducting pole piece;
  • the second magnetic steel assembly includes a fifth magnetic steel arranged on the other side of the first magnetic steel along the vibration direction and a sixth magnetic steel arranged on the other side of the second magnetic steel along the vibration direction, and the The fifth magnetic steel and the sixth magnetic steel are arranged opposite to each other along the direction perpendicular to the vibration direction, and both are partially overlapped with the second magnetically conductive pole piece;
  • the magnetization directions of the first magnetic steel, the second magnetic steel, the third magnetic steel, the fourth magnetic steel, the fifth magnetic steel and the sixth magnetic steel are all perpendicular to The vibration direction of the vibrator, and the magnetization directions of the third magnet steel and the fifth magnet steel are opposite to the magnetization direction of the first magnet steel, the fourth magnet steel and the sixth magnet steel
  • the magnetization directions of the magnets are opposite to the magnetization directions of the second magnets.
  • the first magnetic steel assembly further includes a seventh magnetic steel that is spaced apart from the first magnetically conductive pole piece along the vibration direction;
  • the second magnetic steel assembly further includes an eighth magnetic steel disposed opposite to the second magnetic conducting pole piece along the vibration direction;
  • the magnetization directions of the seventh magnet and the eighth magnet are parallel to the vibration direction, and the magnetization directions of the seventh magnet and the eighth magnet are opposite.
  • the third magnetic steel, the fourth magnetic steel, the fifth magnetic steel and the sixth magnetic steel are all attached with the magnetic conductive sheet.
  • both the seventh magnetic steel and the eighth magnetic steel are attached with the magnetic conductive sheet.
  • the third magnet, the fourth magnet, the fifth magnet, the sixth magnet, the seventh magnet and the eighth magnet are all attached with the magnetic conductive sheet.
  • the vibrator further includes a magnetic frame fixed on the inner wall for fixing the magnetic circuit structure, the magnetic frame includes a first frame plate and a second frame plate arranged at a relative interval, and a relative interval a third frame plate and a fourth frame plate arranged between the two ends of the first frame plate and the second frame plate;
  • the first magnet steel, the third magnet steel and the fifth magnet steel are arranged on the inner surface of the first frame plate facing the stator, the second magnet steel, the fourth magnet steel
  • the steel and the sixth magnetic steel are arranged on the inner surface of the second frame plate facing the stator, and the seventh magnetic steel is arranged on the inner surface of the third frame plate facing the stator,
  • the eighth magnet steel is disposed on the inner surface of the fourth frame plate facing the stator.
  • the vibration motor further includes an elastic member for elastically supporting the vibrator, and the elastic member includes a first elastic portion connected to the housing and a second elastic portion connected to the counterweight. part and a connecting part connected between the first elastic part and the second elastic part.
  • the beneficial effect of the present application is that: the first magnetic steel component and the second magnetic steel component of the vibrator are respectively located on both sides of the stator along the vibration direction, on the inner surface of the first magnetic steel component facing the stator and the second magnetic steel component facing A magnetic conductive sheet is attached to the surface of the stator.
  • This technical solution reduces the direct force between the first magnetic steel assembly, the second magnetic steel assembly and the stator through the magnetic conductive action of the magnetic conductive sheet, thereby reducing the negative stiffness. Improves the performance of the vibration motor.
  • FIG. 1 is a schematic diagram of the overall structure of a vibration motor in an embodiment of the application
  • Fig. 2 is the exploded structure schematic diagram of Fig. 1;
  • Fig. 3 is the top view after removing the top wall of Fig. 1;
  • FIG. 4 is a schematic structural diagram of a stator, a magnetic circuit structure and a magnetic frame
  • FIG. 5 is a cross-sectional view taken along the direction A-A in FIG. 1 .
  • the present application provides a vibration motor 100 , which includes a housing 10 having an accommodation space 10 a , a stator 20 and a vibrator 30 accommodated in the accommodation space 10 a , and a vibrator 30 that is fixed to the casing 10 and suspends the vibrator 30 .
  • the elastic member 41 placed in the receiving space 10a.
  • the vibrator 30 includes a counterweight 33 fixedly connected to the elastic member 41 and having an installation cavity 33a and a magnetic circuit structure 31 accommodated in the installation cavity 33a.
  • the counterweight 33 includes an inner wall 331 surrounding the installation cavity; the magnetic circuit The structure 31 is fixed to the inner wall 331 ; the stator 20 is at least partially accommodated in the installation cavity 33 a and is spaced apart from the inner wall 331 ; the stator 20 includes an iron core 21 fixed to the casing 10 and a surface wound around the iron core 21 and facing the magnetic circuit structure 31
  • the coil 24 is provided;
  • the magnetic circuit structure 31 includes a first magnetic steel component 311 and a second magnetic steel component 312 that are respectively arranged on both sides of the stator 20 along the vibration direction and are symmetrical with respect to the stator 20, and a magnetic steel component 312 attached to the first magnetic steel component 311.
  • the magnetic conductive sheet 314 on the inner surface facing the stator 20 and the inner surface of the second magnetic steel assembly 312 facing the stator 20 .
  • the first magnetic steel assembly 311 and the second magnetic steel assembly 312 of the vibrator 30 are located on both sides of the stator 20 along the vibration direction, respectively. Therefore, the first magnetic steel assembly 311 and the second magnetic steel assembly 312 and the stator 20 Directly acting, a magnetic conductive sheet 314 is attached on the inner surface of the first magnetic steel assembly 311 facing the stator 20 and the inner surface of the second magnetic steel assembly 312 facing the stator 20.
  • This technical solution uses the magnetic conductive effect of the magnetic conductive sheet 314. In order to reduce the direct acting force between the first magnetic steel assembly 311 , the second magnetic steel assembly 312 and the stator 20 , the negative stiffness is reduced, and the performance of the vibration motor 100 is improved.
  • the housing 10 includes a top wall 12, a bottom wall 11 opposite and spaced apart from the top wall 12, and side walls 13 connected between the bottom wall 11 and the top wall 12, the top wall 12 and the bottom
  • the walls 11 are respectively covered on both ends of the side wall 13 to enclose a receiving space 10a, and both the stator 20 and the vibrator 30 are received in the receiving space 10a.
  • the vibration motor 100 further includes a flexible circuit board 50 for connecting the external circuit and the stator 20 .
  • the stator 20 is fixed on the bottom wall 11, and the flexible circuit board 50 is arranged on the bottom wall 11 and connected to the stator 20; the vibrator 30 is suspended in the accommodation space 10a, one end of the elastic member 41 is connected to the vibrator 30, and the elastic member 41 The other end is connected to the side wall 13 of the housing 10 to provide elastic support for the vibrator 30 .
  • the elastic member 41 includes a first elastic portion 411 connected with the side wall 13 of the housing 10 , a second elastic portion 412 connected with the counterweight 33 , and a second elastic portion 412 connected between the first elastic portion 411 and the second elastic portion 412 . connecting part 413 between them.
  • the elastic member 41 is a leaf spring with a U-shaped structure.
  • the vibration motor 100 further includes a soldering piece 42 for fixing the first elastic portion 411 to the side wall 13 and the second elastic portion 412 to the vibrator 30 , which can not only strengthen the first elastic portion 411
  • the bonding force with the side wall 13 , the second elastic portion 412 and the vibrator 30 can also prevent the elastic member 41 from being broken due to excessive bending.
  • the stator 20 further includes a first magnetically conductive pole piece 22 and a second magnetically conductive pole piece 23 respectively fixed at both ends of the iron core 21. After the coil 24 is energized, the first magnetically conductive pole piece 22 and the second magnetically conductive pole piece 23 The shoe 23 is then magnetized.
  • the winding plane of the coil 24 is perpendicular to the vibration direction of the vibrator 30 . It should be noted that the winding plane of the coil 24 is the plane corresponding to one winding of the coil 24 .
  • the magnetic circuit structure 31 further includes a third magnetic steel assembly 313, and the third magnetic steel assembly 313 includes a first magnetic steel 3131 located on one side of the coil 24 and opposite to the coil 24 along the vertical vibration direction and a The vertical vibration direction is located on the other side of the coil 24 and is opposite to the second magnetic steel 3132 arranged with the coil 24 .
  • the first magnetic steel assembly 311 includes a third magnetic steel 3111 arranged on one side of the first magnetic steel 3131 along the vibration direction and a fourth magnetic steel arranged on one side of the second magnetic steel 3132 along the vibration direction 3112, and the third magnetic steel 3111 and the fourth magnetic steel 3112 are oppositely arranged perpendicular to the vibration direction and both partially overlap with the first magnetic conducting pole piece 22. Therefore, the third magnetic steel 3111 and the fourth magnetic steel 3112 directly act on one end of the stator 20 , and there is a difference in attractive force between the third magnetic steel 3111 , the fourth magnetic steel 3112 and the first magnetic conducting pole piece 22 .
  • the second magnetic steel assembly 312 includes a fifth magnetic steel 3121 provided on the other side of the first magnetic steel 3131 along the vibration direction, and a sixth magnetic steel 3122 provided on the other side of the second magnetic steel 3132 along the vibration direction.
  • the magnetic steel 3121 and the sixth magnetic steel 3122 are oppositely arranged perpendicular to the vibration direction and both partially overlap with the second magnetically conductive pole piece 23 . Therefore, the fifth magnetic steel 3121 , the sixth magnetic steel 3122 directly act on the other end of the stator 20 , and there is a difference in attractive force between the fifth magnetic steel 3121 , the sixth magnetic steel 3122 and the second magnetic conducting pole piece 23 .
  • the magnetization directions of the first magnet 3131, the second magnet 3132, the third magnet 3111, the fourth magnet 3112, the fifth magnet 3121 and the sixth magnet 3122 are all perpendicular to the vibration direction, and the third magnet
  • the magnetization directions of the magnets 3111 and the fifth magnets 3121 are opposite to the magnetization directions of the first magnets 3131, and the magnetization directions of the fourth magnets 3112 and the sixth magnets 3122 are both opposite to the magnetization directions of the second magnets 3132. Magnetic directions are opposite.
  • the first magnetic steel assembly 311 further includes a seventh magnetic steel 3113 that is spaced apart from the first magnetic conductive pole piece 22 along the vibration direction; therefore, the third magnetic steel 3111 and the fourth magnetic steel 3112 and the The seven magnetic steels 3113 directly act on one end of the stator 20 , and there is a difference in attractive force between the third magnetic steel 3111 , the fourth magnetic steel 3112 , and the seventh magnetic steel 3113 and the first magnetic conducting pole piece 22 .
  • the second magnetic steel assembly 312 further includes an eighth magnetic steel 3123 that is spaced apart from the second magnetically conductive pole piece 23 along the vibration direction; The other end of the magnetic steel directly acts, and there is a difference in attraction between the fifth magnetic steel 3121 , the sixth magnetic steel 3122 and the eighth magnetic steel 3123 and the second magnetic conducting pole piece 23 .
  • the magnetization directions of the seventh magnet 3113 and the eighth magnet 3123 are parallel to the vibration direction, and the magnetization directions of the seventh magnet 3113 and the eighth magnet 3123 are opposite.
  • the third magnetic steel 3111 , the fourth magnetic steel 3112 , the fifth magnetic steel 3121 and the sixth magnetic steel 3122 are all attached with magnetic conductive sheets 314 to reduce the size of the third magnetic steel 3111 , the third magnetic steel 3111 and the sixth magnetic steel 3122 .
  • the direct acting force between the fourth magnetic steel 3112 , the fifth magnetic steel 3121 , the sixth magnetic steel 3122 and the stator 20 reduces the negative stiffness and improves the performance of the vibration motor 100 .
  • the seventh magnetic steel 3113 and the eighth magnetic steel 3123 are both attached with a magnetic conductive sheet 314 to reduce the direct interaction between the seventh magnetic steel 3113 and the eighth magnetic steel 3123 and the stator 20 . force, thereby reducing the negative stiffness and improving the performance of the vibration motor 100 .
  • the third magnetic steel 3111 , the fourth magnetic steel 3112 , the fifth magnetic steel 3121 , the sixth magnetic steel 3122 , the seventh magnetic steel 3113 and the eighth magnetic steel 3123 are all attached with magnetic conductive sheets 314 , to reduce the direct force between the third magnet 3111, the fourth magnet 3112, the fifth magnet 3121, the sixth magnet 3122, the seventh magnet 3113, the eighth magnet 3123 and the stator 20, Thus, the negative stiffness is reduced, and the performance of the vibration motor 100 is improved.
  • the magnetic conductive sheet 314 attached to the third magnetic steel 3111 and the fifth magnetic steel 3121 is flush with the first magnetic steel 3131, and attached to the fourth magnetic steel 3112 and the sixth magnetic steel The magnetic conductive sheet 314 on the 3122 is flush with the eighth magnetic steel 3123 .
  • each magnetic steel is defined as follows:
  • the magnetization direction of the first magnetic steel 3131 is from the outer surface of the first magnetic steel 3131 away from the stator 20 to the inner surface of the first magnetic steel 3131 toward the stator 20;
  • the magnetization direction of the second magnetic steel 3132 is from the outer surface of the second magnetic steel 3132 away from the stator 20 to the inner surface of the second magnetic steel 3132 toward the stator 20
  • the magnetization direction of the third magnetic steel 3111 is from the inner surface of the third magnetic steel 3111 toward the stator 20 to the outer surface of the third magnetic steel 3111 away from the stator 20;
  • the magnetization direction of the fourth magnetic steel 3112 is from the inner surface of the fourth magnetic steel 3112 toward the stator 20 to the outer surface of the fourth magnetic steel 3112 away from the stator 20;
  • the magnetization direction of the fifth magnetic steel 3121 is from the inner surface of the fifth magnetic steel 3121 toward the stator 20 to the outer surface of the fifth magnetic steel 3121 away from the stator 20;
  • the magnetization direction of the sixth magnetic steel 3122 is from the inner surface of the sixth magnetic steel 3122 toward the stator 20 to the outer surface of the sixth magnetic steel 3122 away from the stator 20;
  • the magnetization direction of the seventh magnetic steel 3113 is from the inner surface of the seventh magnetic steel 3113 toward the stator 20 to the outer surface of the seventh magnetic steel 3113 away from the stator 20;
  • the magnetization direction of the eighth magnetic steel 3123 is from the inner surface of the eighth magnetic steel 3123 toward the stator 20 to the outer surface of the eighth magnetic steel 3123 away from the stator 20 .
  • the vibrator 30 further includes a magnetic frame 32 fixed on the inner wall 331 for fixing the magnetic circuit structure 31, and electromagnetic shielding is realized by the magnetic frame 32, and the magnetic frame 32 includes a first frame plate 321 and The second frame plate 322 , and the third frame plate 323 and the fourth frame plate 324 are disposed relatively spaced between the two ends of the first frame plate 321 and the second frame plate 322 .
  • the first magnetic steel 3131, the third magnetic steel 3111 and the fifth magnetic steel 3121 are disposed on the inner surface of the first frame plate 321 facing the stator 20, the second magnetic steel 3132, the fourth magnetic steel 3112 and the sixth magnetic steel 3132
  • the magnetic steel 3122 is arranged on the inner surface of the second frame plate 322 facing the stator 20
  • the seventh magnetic steel 3113 is arranged on the inner surface of the third frame plate 323 facing the stator 20
  • the eighth magnetic steel 3123 is arranged on the fourth frame On the inner surface of the plate 324 facing the stator 20 .
  • the magnetic frame 32 may adopt an integrated structure or a split structure.
  • two limit blocks 111 are provided at both ends of the bottom wall 11 along the movement direction of the vibrator 30
  • the counterweight block 33 is provided with a limit slot 33 b with a notch facing the limit block 111 .
  • 33b cooperates with the limiting block 111 to limit the displacement of the vibrator 30 .

Landscapes

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

Abstract

Moteur à vibrations, comprenant un boîtier (10) et un stator (20) et un oscillateur (30) et un élément flexible (41) logés dans le boîtier (10); l'oscillateur (30) comprend un bloc de contrepoids (33) relié à demeure à l'élément flexible (41) et présentant une cavité de montage (33a) et une structure de circuit magnétique (31) logée dans la cavité de montage (33a), le bloc de contrepoids (33) comprenant une paroi intérieure (331) agencée de façon à entourer pour former une cavité de montage (33a); la structure de circuit magnétique (31) est fixée à la paroi intérieure (331); le stator (20) est au moins partiellement logé dans la cavité de montage (33a) et disposé loin de la paroi intérieure (331); le stator (20) comprend un noyau de fer (21) fixé au boîtier (10) et une bobine (24) enroulée sur la surface du noyau de fer (21) et disposée à l'opposé de la structure de circuit magnétique (31); la structure de circuit magnétique (31) comprend un premier ensemble aimant (311) et un second ensemble aimant (312) disposés sur les deux côtés du stator (20) et symétriques par rapport au stator (20), et des languettes magnétiquement perméables (314) sont disposées sur la surface du premier ensemble aimant (311) faisant face au stator (20) et sur la surface du second ensemble aimant (312) faisant face au stator (20). Grâce à la conductibilité magnétique des languettes magnétiquement perméables, la présente solution technique réduit la force directe entre le premier ensemble aimant, le second ensemble aimant et le stator, ce qui permet de réduire la rigidité négative et d'améliorer les performance du moteur à vibrations.
PCT/CN2020/122342 2020-09-30 2020-10-21 Moteur à vibrations WO2022067905A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202022219075.2U CN213461492U (zh) 2020-09-30 2020-09-30 一种振动电机
CN202022219075.2 2020-09-30

Publications (1)

Publication Number Publication Date
WO2022067905A1 true WO2022067905A1 (fr) 2022-04-07

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PCT/CN2020/122342 WO2022067905A1 (fr) 2020-09-30 2020-10-21 Moteur à vibrations

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CN (1) CN213461492U (fr)
WO (1) WO2022067905A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180297069A1 (en) * 2017-04-14 2018-10-18 AAC Technologies Pte. Ltd. Vibration motor
CN208015563U (zh) * 2018-03-07 2018-10-26 昆山联滔电子有限公司 线性振动马达
CN209200903U (zh) * 2018-12-17 2019-08-02 瑞声科技（南京）有限公司 振动电机
CN210167935U (zh) * 2019-06-29 2020-03-20 瑞声科技(新加坡)有限公司 振动电机
CN210167941U (zh) * 2019-06-29 2020-03-20 瑞声科技(新加坡)有限公司 振动电机
CN111431371A (zh) * 2020-04-29 2020-07-17 四川安和精密电子电器股份有限公司 一种扁平振动马达及其制造方法
CN211530984U (zh) * 2019-12-30 2020-09-18 瑞声科技(新加坡)有限公司 一种线性电机

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180297069A1 (en) * 2017-04-14 2018-10-18 AAC Technologies Pte. Ltd. Vibration motor
CN208015563U (zh) * 2018-03-07 2018-10-26 昆山联滔电子有限公司 线性振动马达
CN209200903U (zh) * 2018-12-17 2019-08-02 瑞声科技（南京）有限公司 振动电机
CN210167935U (zh) * 2019-06-29 2020-03-20 瑞声科技(新加坡)有限公司 振动电机
CN210167941U (zh) * 2019-06-29 2020-03-20 瑞声科技(新加坡)有限公司 振动电机
CN211530984U (zh) * 2019-12-30 2020-09-18 瑞声科技(新加坡)有限公司 一种线性电机
CN111431371A (zh) * 2020-04-29 2020-07-17 四川安和精密电子电器股份有限公司 一种扁平振动马达及其制造方法

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