WO2022006839A1

WO2022006839A1 - Linear motor

Info

Publication number: WO2022006839A1
Application number: PCT/CN2020/101263
Authority: WO
Inventors: 王尧; 马杰
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技（南京）有限公司
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2022-01-13

Abstract

A linear motor (100), comprising a first cover plate (11), a housing (10) fixed to the first cover plate (11) and forming a first accommodating space (14) with the first cover plate (11), a vibrator (20) accommodated in the first accommodating space (14), a stator (30) driving the vibrator (20) to vibrate, and a spring support (50) fixed to the housing (10) and elastically supporting the vibrator (20). The stator (30) comprises at least a first coil (31) fixed to the housing (10) and providing a first driving force to drive the vibrator (20) to vibrate along a first direction (X) and a second coil (32) fixed to the first cover plate (11) and providing a second driving force to drive the vibrator (20) to vibrate along a second direction (Y) perpendicular to the first direction (X); the vibrator (20) comprises a mass block (21) having a second accommodating space (211) formed therein in a through manner. By adjusting the first driving force and the second driving force, the vibrator (20) moves obliquely under the combined action of the first driving force and the second driving force.

Description

a linear motor

【Technical field】

The utility model relates to the field of motors, in particular to a linear motor.

【Background technique】

Portable consumer electronic products, such as mobile phones, handheld game consoles, navigation devices or handheld multimedia entertainment devices, generally use linear motors for system feedback, such as mobile phone call alerts, game console vibration feedback, etc. There are several types of motors such as cylindrical iron core motors, hollow cup motors and linear linear motors. The vibration direction of the traditional linear linear motor is single, which can only vibrate in a fixed direction, and cannot be adjusted to a specified vibration direction. Therefore, it is necessary to provide a linear motor that can vibrate in an oblique direction in a plane.

【Content of utility model】

The purpose of the utility model is to provide a linear motor which can vibrate in an oblique direction in a plane.

The technical solution of the present invention is as follows: a linear motor includes a first cover plate, a casing fixed on the first cover plate and forming a first receiving space with the first cover plate, A vibrator in the accommodation space, a stator for driving the vibrator to vibrate, and a spring bracket fixed on the casing and elastically supporting the vibrator, the stator at least includes a first driving force fixed to the casing and providing a first driving force to drive the vibrator to vibrate in a first direction The first coil and the second coil fixed with the first cover plate and providing a second driving force to drive the vibrator to vibrate in a second direction perpendicular to the first direction, the vibrator includes a second accommodating space formed through The mass block, the first magnetic steel fixed in the second receiving space and facing and spaced apart from the first coil along the third direction perpendicular to the first direction and the second direction, and the first magnetic steel fixed on the A second magnetic steel in the second receiving space and facing and spaced from the second coil in the third direction, the first magnetic steel and the second magnetic steel are respectively magnetized and polarized by two pieces along the third direction. Magnetic steels with opposite properties are spliced together, the third direction is the thickness direction of the magnetic steels, two pieces of the magnetic steels are spliced to form a splicing line, and the splicing lines of the first magnetic steel and the second magnetic steel are perpendicular to each other , the first driving force and the second driving force act together on the vibrator to cause the vibrator to move obliquely.

More preferably, the linear motor further includes a conductive terminal, and the conductive terminal includes a first conductive terminal electrically connected to the first coil and a second conductive terminal electrically connected to the second coil.

More preferably, the first coil and the second coil are both rectangular coils, and the long axis of the first coil is perpendicular to the long axis of the second coil.

More preferably, the splicing line of the first magnetic steel is the symmetry line of the first magnetic steel, and the splicing line of the second magnetic steel is the symmetry line of the second magnetic steel.

More preferably, the vibrator further includes a bracket fixed in the second receiving space and respectively fixed with the first magnetic steel and the second magnetic steel, the first magnetic steel is fixed on the bracket away from the first magnetic steel. On one side of a cover plate, the second magnetic steel is fixed on a side of the bracket close to the first cover plate.

More preferably, the housing includes a second cover plate disposed opposite to the first cover plate, supports the second cover plate and the first cover plate and is connected with the second cover plate and the first cover plate. A cover plate forms a side wall of the first receiving space, the stator is disposed between the second cover plate and the first cover plate, and the first conductive terminal is fixed on the second cover plate close to the At one end of the stator, the second conductive terminal is fixed to one end of the first cover plate close to the stator.

More preferably, the stator further includes a first iron core installed in the first coil, fixed on the side of the second cover plate close to the stator and fixed with the first iron core and the first coil. The first magnetic conductive sheet, the second iron core installed in the second coil, and the first cover fixed to the side of the first cover plate close to the stator and fixed with the second iron core and the second coil. Two magnetic sheets.

More preferably, the mass block includes a first surface close to one end of the second cover plate, and a second surface opposite to the first surface, and the second accommodation space includes a direction from the first surface toward the first cover plate. A first stepped hole extending and accommodating the first coil, a second stepped hole extending from the second surface to the direction of approaching the second cover plate and accommodating the second coil, approaching from the second stepped hole A fixing groove is formed in the direction of the second cover plate concavely and fixed with the bracket.

More preferably, the bracket includes a support portion for fixing the first magnet steel and the second magnet steel, and an extension portion extending outward from the support portion and fixed with the fixing groove.

More preferably, the vibrator further includes a damping member fixed between the mass block and the spring support.

The beneficial effect of the present utility model is that: the utility model provides a first driving force to drive the vibrator to vibrate in the first direction by arranging the first coil, and provides a second driving force to drive the vibrator to vibrate along the first direction by arranging the second coil. Vibration in the second direction, by adjusting the magnitude of the first driving force and the second driving force, the vibrator moves obliquely under the combined action of the first driving force and the second driving force, and the direction of the oblique movement is And the size can be adjusted by controlling the magnitude of the first driving force and the second driving force.

【Description of drawings】

FIG. 1 is a schematic diagram of the motor structure of the present invention;

FIG. 2 is a schematic exploded view of the motor structure of the present invention;

Fig. 3 is a schematic cross-sectional view at A-A in Fig. 1;

Fig. 4 is a schematic sectional view at B-B in Fig. 1;

FIG. 5 is a schematic structural diagram of the motor concealing second cover of the present invention;

FIG. 6 is a schematic structural diagram of a motor concealing a first cover of the present invention;

FIG. 7 is a top view of the motor hidden second cover of the present invention;

8 is a schematic structural diagram of the stator combined with the magnetic steel and the bracket of the present invention;

Fig. 9 is the structural schematic diagram of the mass block of the present invention;

Fig. 10 is the vibrator vibrating schematic diagram of the utility model along 45 ° direction;

FIG. 11 is a schematic diagram of the magnetization of the magnetic steel of the present invention.

【detailed description】

The present utility model will be further described below with reference to the accompanying drawings and embodiments.

The present invention provides a linear motor 100 , referring to FIGS. 1 to 11 , the motor 100 includes a first cover 11 , a housing 10 , a vibrator 20 , a stator 30 , a conductive terminal 40 and a spring support 50 .

More preferably, the casing 10 is fixed to the first cover plate 11 , and the casing 10 and the first cover plate 11 form a first accommodation space 14 , and the vibrator 20 is accommodated in the first accommodation space 14 . The stator 30 drives the vibrator 20 to vibrate, the spring bracket 50 is fixed to the housing 10 , and the spring bracket 50 plays an elastic supporting role for the vibrator 20 .

More preferably, referring to FIGS. 2 to 7 , the housing 10 includes a second cover plate 12 and a side wall 13 , the first cover plate 11 and the second cover plate 12 are disposed opposite to each other, and the side wall 13 supports the second cover plate 13 . The cover plate 12 and the side wall 13 of the first cover plate 11 , and the side wall 13 , the first cover plate 11 and the second cover plate 12 form a first receiving space 14 . In this embodiment, the side wall 13 includes a first side wall 131 and a second side wall 132 , the first side wall 131 and the second side wall 132 are both L-shaped structures, and the first side wall 131 connected to the second side wall 132 . The stator 30 is disposed between the second cover plate 12 and the first cover plate 11 .

More preferably, the vibrator 20 includes a mass block 21 , a damping member 22 , a bracket 23 , a first magnetic steel 24 and a second magnetic steel 25 ; Installed between the second cover plate 12 and the first cover plate 11 , the damping member 22 is fixed between the mass block 21 and the spring bracket 50 . The bracket 23 is fixed to the second receiving space 211 and is respectively fixed to the first magnetic steel 24 and the second magnetic steel 25 , and the first magnetic steel 24 is fixed to the bracket 23 away from the first cover plate 11 . The second magnetic steel 25 is fixed on the side of the bracket 23 close to the first cover plate 11 , and the bracket 23 is made of high magnetic permeability material to optimize the magnetic field performance of the stator 30 . It can also be made of non-magnetic conductive material, and only plays the role of supporting and fixing the first magnetic steel 24 and the second magnetic steel 25 .

More preferably, referring to FIGS. 1 to 9 , the mass block 21 includes a second receiving space 211 , a first surface 212 and a second surface 213 , and the first surface 212 is where the mass block 21 is close to the second cover plate 12 . The second surface is the end of the mass block close to the first cover plate, and the mass block 21 penetrates to form a second receiving space 211 . The second accommodating space 211 includes a first stepped hole 2111 , a second stepped hole 2112 and a fixing slot 2113 . The first stepped hole 2111 extends from the first surface 212 toward the first cover plate 11 , and the The first stepped hole 2111 accommodates the first coil 31 , the second stepped hole 2112 extends from the second surface 213 toward the second cover 12 , and the second stepped hole 2112 accommodates the first coil 31 . For the second coil 32 , the fixing slot 2113 is recessed from the second stepped hole 2112 toward the second cover plate 12 , and the fixing slot 2113 is fixed to the bracket 23 .

More preferably, referring to FIGS. 2 to 11 , the stator 30 includes a first coil 31 , a second coil 32 , a first magnetic conductive sheet 33 , a second magnetic conductive sheet 34 , a first iron core 35 and a second iron core 36. In this embodiment, the first coil 31 and the second coil 32 are both rectangular coils, the long axis L1 of the first coil 31 is perpendicular to the long axis L2 of the second coil 32, and the The long axis L1 of the first coil 31 is perpendicular to the first direction X, and the long axis of the second coil 32 is perpendicular to the second direction Y. The first coil 31 is fixed to the housing 10 , and the first coil 31 provides a first driving force F1 to drive the vibrator 20 to vibrate along the first direction X. The second coil 32 is fixed to the first cover plate 11 , and the second coil 32 provides a second driving force F2 to drive the vibrator 20 to vibrate in a second direction Y perpendicular to the first direction X, the vibrator The vibration direction of 20 is the direction of the resultant force F of the first driving force F1 and the second driving force F2. By adjusting the magnitude of the first driving force F1 and the second driving force F2, the vibrator can be moved in the first direction X and the second direction Y. It vibrates along the oblique direction in the plane where it is located, and the direction and size of the oblique motion can be adjusted.

Specifically, the first iron core 35 is installed in the first coil 31 , the second iron core 36 is installed in the second coil 32 , and the first magnetic conductive sheet 33 is fixed on the second cover plate 12 close to the stator 30 side, and the first magnetic conductive sheet 33 is fixed with the first iron core 35 and the first coil 31, and the second magnetic conductive sheet 34 is fixed on the side of the first cover plate 11 close to the stator 30, The second magnetic conductive sheet 34 is fixed to the second iron core 36 and the second coil 32 , and the bracket 23 is disposed between the first coil 31 and the second coil 32 .

More preferably, the bracket 23 includes a support portion 231 and an extension portion 232 , the support portion 231 fixes the first magnetic steel 24 and the second magnetic steel 25 , the extension portion 232 extends outward from the support portion 231 , and The extension portion 232 is fixed with the fixing groove 2113 . The first magnetic steel 24 is fixed on the side of the bracket 23 away from the first cover plate 11 , and the first magnetic steel 24 is spaced from the first coil 31 , and the second magnetic steel 25 is fixed on the side of the bracket 23 . The bracket 23 is close to one side of the first cover plate 11 , the second magnetic steel 25 is spaced apart from the second coil, the first magnetic steel 24 is fixed in the second receiving space 211 , and The first magnetic steel 24 is directly opposite and spaced from the first coil 31 along the third direction Z, the third direction Z is perpendicular to the first direction Y and the second direction X, and the third direction Z is perpendicular to the first direction Y and the second direction X. The three directions Z are the thickness directions of the magnetic steel. The second magnetic steel 25 is fixed in the second receiving space 211 , and the second magnetic steel 25 is arranged along the third direction Z facing the second coil 32 at intervals.

More preferably, the first magnetic steel 24 and the second magnetic steel 25 are respectively formed by splicing two magnetic steels magnetized along the third direction Z with opposite polarities, and the two magnetic steels are spliced together. A splicing line L3 is formed, and the splicing line L3 of the first magnetic steel 24 and the second magnetic steel 25 forms an included angle with each other. Preferably, the splicing line L3 of the first magnetic steel 24 and the second magnetic steel 25 is perpendicular to each other.

More preferably, the splicing line L3 of the first magnetic steel 24 is the line of symmetry of the first magnetic steel 24 , and the splicing line L3 of the second magnetic steel 25 is the line of symmetry of the second magnetic steel 25 . The first driving force F1 and the second driving force F2 act together on the vibrator 20 to cause the vibrator 20 to move obliquely. When the first driving force F1 is equal to the second driving force F2, the vibrator moves along the same direction as the second driving force F2. One direction X vibrates at an included angle of 45°.

More preferably, the conductive terminal 40 includes a first conductive terminal 41 and a second conductive terminal 42 , the first conductive terminal 41 is fixed to an end of the second cover plate 12 close to the stator 30 , the second conductive terminal 41 is The conductive terminal 42 is fixed on one end of the first cover 11 close to the stator 30 . The first conductive terminal 41 extends out of the casing 10 and is electrically connected to the second conductive terminal 42 extending out of the casing 10 .

More preferably, referring to FIGS. 2 to 11 , the first conductive terminal 41 is electrically connected to the first coil 31 , the second conductive terminal 42 is electrically connected to the second coil 32 , and the first conductive terminal 41 controls the The magnitude of the first driving force F1 is used to drive the vibrator 20 to vibrate in the first vibration mode, and the second conductive terminal 42 controls the magnitude of the second driving force F2 to drive the vibrator 20 to vibrate in the second vibration mode. vibration,

More preferably, the modal frequency of the first vibration mode is defined as a, and the modal frequency of the second vibration mode is defined as b, which satisfies the relationship:

|a-b|≤10Hz,

where Hz is the unit of Hertz. Preferably, the relational expression: |a-b|=0 Hz is satisfied, so that the modal frequencies of the two are equal.

More preferably, one end of the spring bracket 50 is welded to the mass block 21 along the second direction Y, and the other end of the spring bracket 50 is welded to the housing 10 along the first direction X, so that the vibrator 20 is in the first direction X. The spring bracket 50 is supported to vibrate in an oblique direction in the plane where the first direction X and the second direction Y are located. The spring bracket 50 includes a first spring bracket 51 and a second spring bracket 52 .

More preferably, referring to FIG. 2 and FIG. 6 , the first spring bracket 51 includes a first welding part 511 , a first welding piece 512 , a first elastic supporting part 513 , a first bending part 514 , and a second elastic supporting part 515 , the second welding part 516 and the second welding piece 517 . The first welding part 511 is fixed with the mass block 21 , the first welding piece 512 is fixed on the side of the first welding part 511 away from the mass block 21 , and the first elastic supporting part 513 is formed by the first welding part 511 along the first The first bending part 514 is formed by bending the first elastic supporting part 513; the second elastic supporting part 515 is formed by extending the first bending part 514 along the second direction Y; The two elastic support portions 515 are connected together, the second welding portion 516 is fixed to the casing 10 , and the second welding piece 517 is fixed to the side of the second welding portion 516 away from the casing 10 .

More preferably, referring to FIGS. 2 and 7 , the second spring bracket 52 includes a third welding portion 521 , a third welding piece 522 , a third elastic supporting portion 523 , a second bending portion 524 , and a fourth elastic supporting portion 525, the fourth welding part 526 and the fourth welding piece 527, the third welding part 521 is fixed with the mass block 21, the third welding piece 522 is fixed on the side of the third welding part 521 away from the mass block 21, the first The three elastic support parts 523 are formed by the third welding part 521 extending along the first direction X, the second bending part 524 is formed by bending the third elastic support part 523 , and the fourth elastic support part 525 is formed by the second bending part 524 along the The fourth welding portion 526 is connected to the fourth elastic support portion 525 , the fourth welding portion 526 is fixed to the casing 10 , and the fourth welding piece 527 is fixed to the fourth welding portion 526 away from the casing 10 . side.

Specifically, referring to FIG. 2 , FIG. 6 and FIG. 7 , the damping member 22 includes a first damping member 221 and a second damping member 222 , and the first damping member 221 is fixed to the mass block 21 and the first spring support 51 , the second damping member 222 is fixed between the mass block 21 and the second spring bracket 52 .

Therefore, the present invention provides the first driving force F1 by setting the first coil 31 to drive the vibrator 20 to vibrate in the first direction X, and provides the second driving force F2 by setting the second coil 32 to drive the vibrator 20 along the first direction. The second direction Y perpendicular to X vibrates, and by adjusting the magnitudes of the first driving force F1 and the second driving force F2, the vibrator 20 vibrates obliquely in the plane where the first direction X and the second direction Y are located.

The above are only the embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present utility model, but these belong to the present utility model. A new range of protection.

Claims

A linear motor includes a first cover plate, a casing fixed on the first cover plate and forming a first receiving space with the first cover plate, a vibrator held in the first receiving space, and driving the A vibrator vibrating stator and a spring bracket fixed to the casing and elastically supporting the vibrator, characterized in that the stator at least includes a first coil fixed to the casing and providing a first driving force to drive the vibrator to vibrate in a first direction and a second coil that is fixed with the first cover plate and provides a second driving force to drive the vibrator to vibrate in a second direction perpendicular to the first direction, the vibrator includes a mass block that penetrates through and forms a second accommodation space, a first magnetic steel fixed in the second receiving space and facing and spaced apart from the first coil along a third direction perpendicular to the first direction and the second direction and fixed in the second receiving space And the second magnetic steel facing and spaced apart from the second coil in the third direction, the first magnetic steel and the second magnetic steel are respectively composed of two magnets that are magnetized along the third direction and have opposite polarities. The third direction is the thickness direction of the magnetic steel. Two pieces of the magnetic steel are spliced to form a splicing line. The splicing line of the first magnetic steel and the second magnetic steel is perpendicular to each other. A driving force and the second driving force act together on the vibrator to cause the vibrator to move obliquely.
The linear motor of claim 1, wherein the linear motor further comprises a conductive terminal, and the conductive terminal comprises a first conductive terminal electrically connected to the first coil and electrically connected to the second coil the second conductive terminal.
The linear motor according to claim 1, wherein the first coil and the second coil are both rectangular coils, and the long axis of the first coil is perpendicular to the long axis of the second coil.
The linear motor according to claim 1, wherein the splicing line of the first magnetic steel is the symmetry line of the first magnetic steel, and the splicing line of the second magnetic steel is the second magnetic steel line of symmetry.
The linear motor according to claim 1, wherein the vibrator further comprises a bracket fixed to the second receiving space and respectively fixed to the first magnetic steel and the second magnetic steel, the first magnetic steel The steel is fixed to the side of the bracket away from the first cover plate, and the second magnetic steel is fixed to the side of the bracket close to the first cover plate.
The linear motor according to claim 2, wherein the housing comprises a second cover plate disposed opposite to the first cover plate, and supports the second cover plate and the first cover plate and is connected with the first cover plate. The second cover plate and the first cover plate form a side wall of the first accommodation space, the stator is arranged between the second cover plate and the first cover plate, and the first conductive terminal is fixed At the end of the second cover plate close to the stator, the second conductive terminal is fixed on the end of the first cover plate close to the stator.
The linear motor according to claim 6, wherein the stator further comprises a first iron core installed in the first coil, fixed on the side of the second cover plate close to the stator and connected with the The first magnetic conductive sheet fixed with the first iron core and the first coil, the second iron core installed in the second coil, and the second iron core fixed on the side of the first cover plate close to the stator and connected with the second The iron core and the second coil are fixed with the second magnetic conductive sheet.
The linear motor according to claim 7, wherein the mass block comprises a first surface close to one end of the second cover plate and a second surface opposite to the first surface, and the second receiving space comprises a self The first surface extends in the direction close to the first cover plate and accommodates the first stepped hole of the first coil, and the second stepped hole extends from the second surface in the direction close to the second cover plate and accommodates the second coil and a fixing groove formed concavely from the second stepped hole toward the direction close to the second cover plate and fixed with the bracket.
The linear motor of claim 8, wherein the bracket comprises a support portion for fixing the first magnet steel and the second magnet steel, and a support portion extending outward from the support portion and being fixed with the fixing groove the extension.
The linear motor according to claim 9, wherein the vibrator further comprises a damping member fixed between the mass block and the spring support.