WO2024087542A1

WO2024087542A1 - Linear motor

Info

Publication number: WO2024087542A1
Application number: PCT/CN2023/089276
Authority: WO
Inventors: 叶洪新
Original assignee: 深圳术叶创新科技有限公司
Priority date: 2022-10-24
Filing date: 2023-04-19
Publication date: 2024-05-02
Also published as: CN218733801U

Abstract

The present application discloses a linear motor, comprising a motion unit, a driving unit, and an elastic supporting unit connecting the motion unit and the driving unit. The motion unit comprises a top seat and a magnet; the driving unit comprises a bottom seat and a stator assembly; the stator assembly comprises an iron core and a plurality of coil windings; the iron core comprises a connecting portion fixedly connected to the bottom seat, and a plurality of mandrels extending upwards from the connecting portion; the plurality of mandrels are arranged at intervals in a left-right direction; the plurality of coil windings are sleeved on the plurality of mandrels in a one-to-one correspondence manner; the elastic supporting unit comprises elastic arms extending in a vertical direction; the elastic arms are located on the front side and/or the rear side of the stator assembly; and the elastic arms have upper ends connected to the top seat, and lower ends connected to the bottom seat. The elastic arms of the linear motor of the present utility model are arranged on the front side and/or the rear side of the stator assembly, so that the linear motor can be suitable for a narrower installation space in the arrangement direction of the coil windings.

Description

Linear Motor

Technical Field

The present application relates to the technical field of linear motors for realizing reciprocating, swinging or vibrating motion, and in particular to a linear motor.

Background technique

Portable care appliances often use linear motors to drive actuators, such as the blade of an electric shaver or the brush head of an electric toothbrush. The linear motor includes a motion unit (permanent magnet) and a drive unit (iron core coil). There is a certain gap between the permanent magnet of the motion unit and the stator assembly of the drive unit. The permanent magnet of the reciprocating linear motor reciprocates back and forth at a certain frequency relative to the stator assembly. Therefore, a structural unit is required to provide support to ensure the gap between the permanent magnet and the iron core, and another structural unit provides elastic force for reciprocating back and forth. The structural unit that realizes the above two functions can be called an elastic support unit. The existing elastic support unit is arranged in the arrangement direction of multiple coil windings. For example, multiple coil windings are arranged in the left and right directions, then one elastic support unit is arranged at the left end of the linear motor, and the other elastic support unit is arranged at the right end of the linear motor. Since the elastic support unit also requires movement space on both sides of the left and right directions, the left and right dimensions of the linear motor are large, and the required installation space is correspondingly large, so it cannot adapt to the narrower installation space in the left and right directions.

Utility Model Content

The main purpose of this application is to propose a linear motor, which aims to solve the technical problem that the existing linear motors are large in the arrangement direction of the coil windings and cannot adapt to a smaller installation space.

To achieve the above-mentioned purpose, the linear motor proposed in the present application includes a motion unit, a drive unit and an elastic support unit connecting the motion unit and the drive unit.

The motion unit includes a top seat and a magnet fixedly connected to the top seat;

The driving unit is arranged below the motion unit and a gap is formed between the driving unit and the motion unit; the driving unit includes a base and a stator assembly, and the stator assembly includes an iron core and a plurality of The coil winding, the iron core comprises a connection portion fixedly connected to the base and a plurality of core shafts extending upward from the connection portion, the plurality of core shafts being arranged in a spaced arrangement in the left-right direction; the plurality of coil windings are sleeved on the plurality of core shafts in a one-to-one correspondence;

The elastic support unit includes an elastic arm extending in the up-down direction, the elastic arm is located at the front side and/or the rear side of the stator assembly, the upper end of the elastic arm is connected to the top seat, and the lower end is connected to the base.

Preferably, the elastic support unit further includes an energy storage reset portion, the elastic arm is fixedly connected to the energy storage reset portion, and the energy storage reset portion is fixedly mounted on the base and located below the base.

Preferably, the energy storage reset portion is a coil spring structure that spirally extends in the front-rear direction, and the elastic arm is a rod-shaped structure extending from one end of the energy storage reset portion;

The elastic support unit also includes an upper torsion arm and a lower torsion arm. The upper torsion arm extends from the upper end of the elastic arm to a center plane close to the front-to-back direction, and is fixedly connected to the top seat; the lower torsion arm is led out from the other end of the energy storage reset part, and is fixedly installed on the base.

Preferably, the elastic support unit includes two energy storage reset parts, and the two energy storage reset parts are spaced apart in the front-to-back direction. Two ends of the two energy storage reset parts that are away from each other are each connected to an elastic arm, and two ends of the two energy storage reset parts that are close to each other are each connected to a lower torsion arm, and the upper end of each elastic arm is connected to an upper torsion arm, and the two upper torsion arms are connected to form an integrated structure extending along the front-to-back direction.

Preferably, the top seat includes a top plate and a top cover fixedly covering the upper surface of the top plate, the lower surface of the top cover is provided with a first half groove, the upper surface of the top plate is provided with a second half groove corresponding to the first half groove, the first half groove and the second half groove are enclosed at the joint of the top plate and the top cover to form an upper fixing hole adapted to the upper torsion arm; the magnet is fixedly connected to the lower surface of the top plate.

Preferably, the top cover is detachably covered on the upper surface of the top plate, the top cover is provided with a first through hole, and the top plate is provided with a first screw hole corresponding to the first through hole; the top seat also includes a first screw, the first screw passes through the first through hole and is threadedly connected to the first screw hole.

Preferably, the base comprises a bottom plate and a bottom cover fixedly covering the lower surface of the bottom plate, the lower torsion arm extends adjacent to the lower surface of the bottom plate; a third half groove is provided on the lower surface of the bottom plate, a fourth half groove is provided on the upper surface of the bottom cover corresponding to the third half groove, the third half groove and the fourth half groove are enclosed at the joint of the bottom plate and the bottom cover to form a lower fixing hole adapted to the lower torsion arm; The iron core is fixedly connected to the bottom plate.

Preferably, the number of the coil windings and the number of the mandrels are both two;

There are two elastic support units, and the energy storage reset parts of the two elastic support units are spaced apart in the left-right direction; there are two bottom covers, and the lead-out directions of the lower torsion arms of the two elastic support units are opposite to each other, and the two energy storage reset parts of the two elastic support units are located between the two bottom covers.

Preferably, a avoidance groove is provided on the lower surface of the bottom plate corresponding to the energy storage reset portion, and the third half groove is connected to the avoidance groove.

Preferably, the two bottom covers are detachably covered on the lower surfaces of the left and right ends of the bottom plate respectively; the bottom cover is provided with a second through hole, the bottom plate is provided with a second screw hole corresponding to the second through hole, and the base further includes a second screw, the second screw passes through the second through hole and is threadedly connected to the second screw hole;

The linear motor further comprises a housing and two flexible connectors, wherein the housing has an inner cavity and a top opening communicating with the inner cavity;

The motion unit, the driving unit and the elastic support unit are all located in the inner cavity, and the connections between the left and right side walls of the outer shell and the bottom wall of the outer shell are chamfered to form a first avoidance hole communicating with the inner cavity;

The two flexible connectors are respectively located on the left and right sides of the stator assembly, the upper end of the flexible connector is fixedly connected to the edge of the top opening, and the lower end is fixedly connected to the base; the lower middle part of the flexible connector and the base are exposed in the first avoidance hole.

Preferably, the base includes a bottom plate, a positioning column and two fixed plates, the two fixed plates extend downward from the bottom plate and are arranged opposite to each other in the front-to-back direction, the positioning column extends along the front-to-back direction and both ends are fixedly connected to the two fixed plates respectively; the energy storage reset part is sleeved on the positioning column.

The elastic support units are provided with two, and the energy storage reset parts of the two elastic support units are arranged at intervals in the left-right direction;

There are two positioning posts, the energy storage reset part of one elastic support unit is sleeved on one positioning post, and the energy storage reset part of the other elastic support unit is sleeved on the other positioning post;

The fixing plate includes a transverse extension portion and a longitudinal extension portion extending upward from the upper edge of the transverse extension portion; the longitudinal extension portion is detachably fixed to the bottom plate; the left and right sides of the transverse extension portion are The ends are respectively fixedly connected to the two positioning posts.

Preferably, the edge of the bottom plate is provided with a avoiding notch corresponding to the elastic arm, a convex plate is formed between two adjacent avoiding notches on the same side of the bottom plate, and the fixing plate is detachably fixed to the outer end surface of the adjacent convex plate;

The longitudinal extension portion is provided with a third through hole, the outer end surface of the convex plate is provided with a third screw hole corresponding to the third through hole, and the base further includes a third screw, the third screw passes through the third through hole and is threadedly connected to the third screw hole;

The motion unit, the driving unit and the elastic support unit are all located in the inner cavity, and the front and rear side walls of the shell are provided with second avoidance holes corresponding to the adjacent fixing plates;

The two flexible connectors are respectively located on the left and right sides of the stator assembly; the upper ends of the flexible connectors are fixedly connected to the edge of the top opening, and the lower ends are fixedly connected to the base.

Preferably, the positioning column comprises a fixed shaft and a buffer sleeve sleeved on the fixed shaft, and two ends of the fixed shaft are respectively fixedly connected to the two fixing plates.

The motion unit, drive unit and elastic support unit are all located in the inner cavity, the two flexible connectors are respectively located on the left and right sides of the stator assembly, the upper end of the flexible connector is fixedly connected to the edge of the top opening, and the lower end is fixedly connected to the base.

The linear motor of the utility model is provided with elastic arms on the front side and/or the rear side of the stator assembly to connect the top seat of the motion unit and the base of the drive unit. In this way, the movable space of the elastic arms is also located on the front side and/or the rear side of the stator assembly, thereby saving space in the arrangement direction of the coil windings, thereby making the installation adaptability of the linear motor higher and suitable for a narrower installation space in the arrangement direction of the coil windings.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will describe the embodiments. The drawings that need to be used are briefly introduced. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of a three-dimensional structure of a linear motor of the present invention with the top facing upward;

FIG2 is a schematic diagram of a three-dimensional structure of the linear motor in FIG1 with its bottom facing upward;

FIG3 is a schematic diagram of an exploded structure of the linear motor in FIG1 ;

FIG4 is a schematic diagram of a top view of the structure of the linear motor in FIG1 ;

FIG5 is a schematic diagram of the cross-sectional structure along line V-V in FIG4 ;

FIG6 is a schematic cross-sectional view of the structure along line VI-VI in FIG4 ;

FIG7 is another exploded structural schematic diagram of the motion unit in FIG3 ;

FIG8 is a schematic diagram of the three-dimensional structure of the base in FIG3 from another angle;

FIG9 is a schematic diagram of the exploded structure of the base in FIG8 ;

FIG. 10 is a schematic diagram of the exploded structure of the flexible connector in FIG. 3 .

Description of Figure Numbers:

Detailed ways

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

1 to 6 , in one embodiment, the linear motor 100 proposed in the present application includes a motion unit 10, a drive unit 25, and an elastic support unit 55 connecting the motion unit 10 and the drive unit 25.

The motion unit 10 includes a top seat 11 and a magnet 20 fixedly connected to the top seat 11;

The driving unit 25 is disposed below the motion unit 10 and a gap 60 is formed between the driving unit 25 and the motion unit 10; the driving unit 25 includes a base 26 and a stator assembly 45, the stator assembly 45 includes an iron core 46 and a plurality of coil windings 49, the iron core 46 includes a connecting portion 47 fixedly connected to the base 26 and a plurality of core shafts 48 extending upward from the connecting portion 47, the plurality of core shafts 48 are arranged at intervals in the left-right direction; the plurality of coil windings 49 are sleeved on the plurality of core shafts 48 in a one-to-one correspondence;

The elastic support unit 55 includes an elastic arm 56 extending in the up-down direction. The elastic arm 56 is located at the front side and/or the rear side of the stator assembly 45 . The upper end of the elastic arm 56 is connected to the top seat 11 , and the lower end is connected to the base 26 .

In this embodiment, the motion unit 10 reciprocates under the drive of magnetic force. In order to facilitate connection with an actuator, such as a razor head or an electric toothbrush head, the motion unit 10 may also include an output shaft fixedly connected to the top seat 11. In order to achieve sufficient strength with a smaller volume, the top seat 11 and the base 26 are preferably made of steel. The stator assembly 45 of the drive unit 25 is used to generate an electromagnetic field for driving the motion unit 10 when powered. The stator assembly 45 usually includes two coil windings 49, but more, such as 3, 4, etc., can be provided as needed. The coil winding 49 includes a bobbin of insulating material and a coil wound on the bobbin. The bobbins between different coil windings 49 can be arranged in one piece or in a separate piece. The elastic arm 56 can accumulate elastic potential energy when bent, thereby driving the motion unit 10 to reset when the electromagnetic force weakens.

The linear motor 100 of the present invention is connected to the top seat 11 of the motion unit 10 and the base 26 of the drive unit 25 by arranging an elastic arm 56 on the front side and/or the rear side of the stator assembly 45. In this way, the movable space of the elastic arm 56 is also located on the front side and/or the rear side of the stator assembly 45, thereby saving space in the arrangement direction of the coil winding 49, thereby making the installation adaptability of the linear motor 100 higher and suitable for a narrower installation space in the arrangement direction of the coil winding 49.

Furthermore, in order to further improve the compactness of the structure, the elastic support unit 55 also includes an energy storage reset part 57, and the elastic arm 56 is fixedly connected to the energy storage reset part 57, so that the elastic arm 56 can accumulate greater potential energy in a relatively small activity space by storing energy with the help of the energy storage reset part 57. The energy storage reset part 57 is fixedly mounted on the base 26 and is located below the base 26, so that the space below the base 26 can be better utilized.

Further, the energy storage reset portion 57 is a coil spring structure that spirally extends in the front-rear direction, and the elastic arm 56 is a rod-shaped structure extending from one end of the energy storage reset portion 57;

The elastic support unit 55 also includes an upper torsion arm 58 and a lower torsion arm 59. The upper torsion arm 58 extends from the upper end of the elastic arm 56 to a center plane close to the front-to-back direction, and is fixedly connected to the top seat 11; the lower torsion arm 59 is led out from the other end of the energy storage reset portion 57, and is fixedly installed on the base 26.

In this embodiment, the energy storage reset portion 57 of the elastic support unit 55 is a spiral spring structure, so that the elastic arm 56, the upper torsion arm 58, and the lower torsion arm 59 can be directly drawn out from the spiral spring structure, so that the elastic support unit 55 can be formed by bending a rod-shaped material in one piece. The upper end and the lower end of the elastic arm 56 are fixedly connected to the top seat 11 and the base 26 through the upper torsion arm 58 and the lower torsion arm 59, respectively, so that on the one hand, it is convenient to assemble, and on the other hand, it is easier to ensure the connection strength.

Furthermore, the elastic support unit 55 includes two energy storage reset parts 57, and the two energy storage reset parts 57 are arranged at intervals in the front-to-back direction. The two ends of the two energy storage reset parts 57 that are away from each other are each connected to an elastic arm 56, and the two ends of the two energy storage reset parts 57 that are close to each other are each connected to a lower torsion arm 59, and the upper end of each elastic arm 56 is connected to an upper torsion arm 58, and the two upper torsion arms 58 are connected to form an integrated structure extending along the front-to-back direction.

In this embodiment, by providing two energy storage reset parts 57, the strength of energy storage can be further increased, thereby reducing the activity space required by the elastic arm 56, and since each energy storage reset part 57 is connected to an elastic arm 56, the elastic support unit 55 can form a more balanced elastic support and reset effect on both sides of the center plane in the front-to-back direction.

Further, please refer to FIG. 7, in one embodiment, the top base 11 includes a top plate 12 and a fixed A top cover 15 is fixedly covered on the upper surface of the top plate 12, a first half groove 13 is provided on the lower surface of the top cover 15, a second half groove 16 is provided on the upper surface of the top plate 12 corresponding to the first half groove 13, the first half groove 13 and the second half groove 16 are enclosed at the joint of the top plate 12 and the top cover 15 to form an upper fixing hole 18 adapted to the upper torsion arm 58; the magnet 20 is fixedly connected to the lower surface of the top plate 12.

In this embodiment, the top seat 11 is clamped and fixed with the upper torsion arm 58 by the top plate 12 and the top cover 15, so that the assembly of the upper torsion arm 58 is easier, and the upper torsion arm 58 is passed through the upper fixing hole 18, so that a good limiting effect can be achieved. In some embodiments, the upper torsion arm 58 can also rotate in the upper fixing hole 18.

Furthermore, the top cover 15 is detachably covered on the upper surface of the top plate 12 , the top cover 15 is provided with a first through hole 17 , and the top plate 12 is provided with a first screw hole 14 corresponding to the first through hole 17 ; the top seat 11 also includes a first screw 19 , the first screw 19 passes through the first through hole 17 and is threadedly connected to the first screw hole 14 .

In this embodiment, the upper torsion arm 58 can be detachably fixed. In order to reduce magnetic loss, the top plate 12 is made of pure iron, and the top cover 15 is made of steel.

Further, referring to Figures 1 to 6, Figures 8 and 9, in one embodiment, the base 26 includes a bottom plate 27 and a bottom cover 33 fixedly covering the lower surface of the bottom plate 27, and the lower torsion arm 59 extends adjacent to the lower surface of the bottom plate 27; a third half groove 28 is provided on the lower surface of the bottom plate 27, and a fourth half groove 34 is provided on the upper surface of the bottom cover 33 corresponding to the third half groove 28, and the third half groove 28 and the fourth half groove 34 are enclosed at the joint of the bottom plate 27 and the bottom cover 33 to form a lower fixing hole 36 adapted to the lower torsion arm 59; the iron core 46 is fixedly connected to the bottom plate 27.

In this embodiment, similar to the fixation of the upper torque arm 58 , the lower torque arm 59 is fixed by clamping the bottom plate 27 and the bottom cover 33 , which makes the assembly of the lower torque arm 59 easier, and the lower fixing hole 36 can also play a good limiting role for the lower torque arm 59 .

Further, the number of coil windings 49 and the number of core shafts 48 are both two;

There are two elastic support units 55, and the energy storage reset parts 57 of the two elastic support units 55 are arranged at intervals in the left-right direction; there are two bottom covers 33, and the lead-out directions of the lower torsion arms 59 of the two elastic support units 55 are opposite to each other, and the two energy storage reset parts 57 of the two elastic support units 55 are located between the two bottom covers 33.

In this embodiment, two elastic support units 55 are provided to form a more balanced elastic support and reset function on both sides of the center plane in the front-rear direction. By rationally arranging the two bottom covers 33 and the spatial positions of the two energy storage reset parts 57, the fixing strength of the lower torsion arm 59 and the balance of the energy storage reset part 57 are ensured, and the compactness of the structure is achieved.

Furthermore, in order to save installation space in the up and down directions and reduce the height dimension of the linear motor 100, a avoidance groove 29 is provided on the lower surface of the base plate 27 corresponding to the energy storage reset portion 57, and the third half groove 28 is connected to the avoidance groove 29, so that the lower torsion arm 59 can extend straight in the left and right directions.

Further, in order to realize the detachable installation of the lower torsion arm 59, the two bottom covers 33 are detachably covered on the lower surfaces of the left and right ends of the bottom plate 27 respectively; the bottom cover 33 is provided with a second through hole 35, the bottom plate 27 is provided with a second screw hole 30 corresponding to the second through hole 35, and the base 26 further includes a second screw 37, the second screw 37 passes through the second through hole 35 and is threadedly connected with the second screw hole 30;

The linear motor 100 further includes a housing 65 and two flexible connectors 75 , wherein the housing 65 has an inner cavity 66 and a top opening 67 communicating with the inner cavity 66 ;

The motion unit 10, the drive unit 25 and the elastic support unit 55 are all located in the inner cavity 66. In order to further reduce the outer dimensions of the linear motor 100, the connection between the left and right side walls of the housing 65 and the bottom wall of the housing 65 is chamfered to form a first avoidance hole 68 communicating with the inner cavity 66;

The two flexible connectors 75 are respectively located on the left and right sides of the stator assembly 45 , the upper end of the flexible connector 75 is fixedly connected to the edge of the top opening 67 , and the lower end is fixedly connected to the base 26 ; the middle and lower parts of the flexible connector 75 and the base 26 are exposed in the first avoidance hole 68 .

In this embodiment, the housing 65 and the driving unit 25 are connected by providing a flexible connecting member 75 , so that a portion of the vibration of the driving unit 25 can be buffered, thereby reducing the noise of the linear motor 100 .

Furthermore, the base 26 includes a bottom plate 27, a positioning column 38 and two fixing plates 41. The two fixing plates 41 extend downward from the bottom plate 27 and are arranged opposite to each other in the front-to-back direction. The positioning column 38 extends along the front-to-back direction and both ends are fixedly connected to the two fixing plates 41 respectively; the energy storage reset part 57 is sleeved on the positioning column 38, so as to prevent the energy storage reset part 57 from loosening and ensure that the energy storage reset part 57 is deformed in a preset direction, thereby ensuring the stability of the reciprocating motion.

There are two elastic support units 55, and the energy storage reset parts 57 of the two elastic support units 55 are spaced apart in the left-right direction;

There are two positioning posts 38, the energy storage reset portion 57 of one elastic support unit 55 is sleeved on one positioning post 38, and the energy storage reset portion 57 of the other elastic support unit 55 is sleeved on the other positioning post 38;

The fixing plate 41 includes a transverse extension portion 41 and a longitudinal extension portion 42 extending upward from the upper edge of the transverse extension portion 41 ; the longitudinal extension portion 42 is detachably fixed to the bottom plate 27 ; the left and right ends of the transverse extension portion 41 are fixedly connected to the two positioning columns 38 respectively.

In this embodiment, by providing two elastic support units 55, a more balanced elastic support and reset function can be formed on both sides of the center plane in the front-back direction. A fixing plate 41 connects two positioning posts 38, so that the number of parts can be reduced, and the fixing plate 41 is configured to include a transverse extension portion 41 and a longitudinal extension portion 42, so that the size of the fixing plate 41 is reduced, thereby reducing the weight of the fixing plate 41, and further reducing the overall weight of the linear motor 100.

Furthermore, the edge of the bottom plate 27 is provided with a avoiding notch 31 corresponding to the elastic arm 56, and a convex plate 32 is formed between two adjacent avoiding notches 31 on the same side of the bottom plate 27, and the fixing plate 41 is detachably fixed to the outer end surface of the adjacent convex plate 32;

The longitudinal extension portion 42 is provided with a third through hole 421, and the outer end surface of the protruding plate 32 is provided with a third screw hole 321 corresponding to the third through hole 421. The base 26 further includes a third screw 43, which passes through the third through hole 421 and is threadedly connected to the third screw hole 321;

The motion unit 10, the drive unit 25 and the elastic support unit 55 are all located in the inner cavity 66, and the front and rear side walls of the housing 65 are provided with second avoidance holes 69 corresponding to the adjacent fixing plates 41;

The two flexible connectors 75 are respectively located on the left and right sides of the stator assembly 45 . The upper ends of the flexible connectors 75 are fixedly connected to the edge of the top opening 67 , and the lower ends of the flexible connectors 75 are fixedly connected to the base 26 .

In this embodiment, the elastic arm 56 is located in the avoidance notch 31, which not only makes the structure more compact, but also does not affect the swing of the elastic arm 56. In order to ensure sufficient structural strength and reduce the volume, preferably, the fixing plate 41 is made of steel.

Furthermore, the positioning column 38 includes a fixed shaft 39 and a buffer sleeve 40 sleeved on the fixed shaft 39 , and two ends of the fixed shaft 39 are fixedly connected to two fixing plates 41 respectively.

In this embodiment, the energy storage reset portion 57 is in contact with the buffer sleeve 40 , so that a portion of the energy of the energy storage reset portion 57 can be buffered by the buffer sleeve 40 .

The motion unit 10, the drive unit 25 and the elastic support unit 55 are all located in the inner cavity 66. The two flexible connectors 75 are respectively located on the left and right sides of the stator assembly 45. The upper end of the flexible connector 75 is connected to the top The edge of the opening 67 is fixedly connected, and the lower end is fixedly connected to the base 26 .

In this embodiment, two elastic support units 55 are provided to form a more balanced elastic support and reset function on both sides of the center plane in the front-back direction. A flexible connector 75 is provided to connect the housing 65 and the drive unit 25, so that a part of the vibration of the drive unit 25 can be buffered, thereby reducing the noise of the linear motor 100.

Further, referring to FIGS. 1 to 6 and 10 , in one embodiment, in order to fix the linear motor 100 to the main structure of the household appliance, the outer side surfaces of the left and right side walls of the housing 65 are provided with fixing lugs 70, and the fixing lugs 70 are provided with through holes 71; the fixing lugs 70 are adjacent to the upper edge of the first avoidance hole 68. In this way, the fixing of the linear motor 100 can be achieved by passing the fastener through the through holes 71 on the fixing lugs 70 and then connecting to the fixing holes on the main structure.

Furthermore, the flexible connector 75 includes a spring piece 76 and two clips 81. The spring piece 76 is in a "匚-shaped" shape, including a fixed piece 77 and two swing pieces 79 extending upward from both ends of the fixed piece 77. The two clips 81 are attached to the inner and outer sides of the fixed piece 77 and are fixedly connected to the fixed piece 77.

The flexible connector 75 is provided with a positioning hole 83 that passes through the middle of the fixing plate 77 and the two clips 81 . The base 26 is provided with a positioning boss 44 embedded in the positioning hole 83 . The positioning boss 44 is welded and fixed to the positioning hole 83 . The upper end of the swinging plate 79 is fixedly connected to the edge of the top opening 67 .

In this embodiment, the lower end of the spring piece 76 is pre-fixed and connected by two clips 81, which partially increases the thickness of the flexible connector 75 and the depth of the positioning hole 83. In this way, the positioning hole 83 can be connected to the positioning boss 44 to achieve precise pre-installation, and the connection position has sufficient strength after welding.

Furthermore, in order to achieve faster assembly, the fixing plate 77 is fixed to the two clips 81 by riveting, a first connecting hole 78 is provided at each end of the fixing plate 77, and a first rivet hole 82 is provided on the clip 81 corresponding to the first connecting hole 78, and the flexible connector 75 also includes a first rivet 84 that passes through the first rivet hole 82 and the first connecting hole 78 to fix the fixing plate 77 and the clip 81.

Furthermore, in order to facilitate the connection between the flexible connector 75 and the housing 65 and reduce stress concentration at the connection, a second connecting hole 80 is provided at the upper end of the swing plate 79; the linear motor 100 also includes a gasket 85, which is in the shape of a long strip and is arranged along the front-to-back direction. A second rivet hole 86 is provided at each end of the gasket 85, and a third rivet hole 72 is provided at the edge of the top opening 67. The flexible connector 75 also includes a second rivet, which is fixedly inserted into the second rivet hole 86, the second connecting hole 80 and the second connecting hole 80 to fix the upper end of the swing plate 79 to the edge of the top opening 67.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

A linear motor comprises a motion unit, a driving unit and an elastic supporting unit connecting the motion unit and the driving unit, wherein:

The motion unit includes a top seat and a magnet fixedly connected to the top seat;

The driving unit is arranged below the moving unit and a gap is formed between the driving unit and the moving unit; the driving unit includes a base and a stator assembly, the stator assembly includes an iron core and a plurality of coil windings, the iron core includes a connecting portion fixedly connected to the base and a plurality of core shafts extending upward from the connecting portion, the plurality of core shafts are arranged at intervals in the left-right direction; the plurality of coil windings are sleeved on the plurality of core shafts in a one-to-one correspondence;

The elastic support unit includes an elastic arm extending in the up-down direction, the elastic arm is located at the front side and/or the rear side of the stator assembly, the upper end of the elastic arm is connected to the top seat, and the lower end is connected to the base.
The linear motor as described in claim 1 is characterized in that the elastic support unit also includes an energy storage reset part, the elastic arm is fixedly connected to the energy storage reset part, and the energy storage reset part is fixedly installed on the base and located below the base.
The linear motor according to claim 2, characterized in that

The energy storage reset part is a coil spring structure that spirally extends in the front-rear direction, and the elastic arm is a rod-shaped structure extending from one end of the energy storage reset part;

The elastic support unit also includes an upper torsion arm and a lower torsion arm. The upper torsion arm extends from the upper end of the elastic arm to a center plane close to the front-to-back direction, and is fixedly connected to the top seat; the lower torsion arm is led out from the other end of the energy storage reset part, and is fixedly installed on the base.
The linear motor according to claim 3, characterized in that

The elastic support unit comprises two energy storage reset parts, the two energy storage reset parts are arranged at intervals in the front-to-back direction, two ends of the two energy storage reset parts that are away from each other are each connected to an elastic arm, two ends of the two energy storage reset parts that are close to each other are each connected to a lower torsion arm, the upper end of each elastic arm is connected to an upper torsion arm, and the two upper torsion arms are connected to form a front-to-back direction. An integrated structure extending inwards.
The linear motor according to claim 3, characterized in that

The top seat includes a top plate and a top cover fixedly covering the upper surface of the top plate, the lower surface of the top cover is provided with a first half groove, the upper surface of the top plate is provided with a second half groove corresponding to the first half groove, the first half groove and the second half groove are enclosed at the joint of the top plate and the top cover to form an upper fixing hole adapted to the upper torsion arm; the magnet is fixedly connected to the lower surface of the top plate.
The linear motor as described in claim 5 is characterized in that the top cover is detachably covered on the upper surface of the top plate, the top cover is provided with a first through hole, and the top plate is provided with a first screw hole corresponding to the first through hole; the top seat also includes a first screw, the first screw passes through the first through hole and is threadedly connected to the first screw hole.
The linear motor as described in any one of claims 3-5 is characterized in that the base includes a bottom plate and a bottom cover fixedly covering the lower surface of the bottom plate, the lower torque arm extends adjacent to the lower surface of the bottom plate; a third half groove is provided on the lower surface of the bottom plate, and a fourth half groove is provided on the upper surface of the bottom cover corresponding to the third half groove, the third half groove and the fourth half groove are enclosed at the joint of the bottom plate and the bottom cover to form a lower fixing hole adapted to the lower torque arm; the iron core is fixedly connected to the bottom plate.
The linear motor according to claim 7, characterized in that

The number of the coil windings and the number of the mandrels are both two;

There are two elastic support units, and the energy storage reset parts of the two elastic support units are spaced apart in the left-right direction; there are two bottom covers, and the lead-out directions of the lower torsion arms of the two elastic support units are opposite to each other, and the two energy storage reset parts of the two elastic support units are located between the two bottom covers.
The linear motor according to claim 8, characterized in that

A avoiding groove is provided on the lower surface of the bottom plate corresponding to the energy storage reset portion, and the third half groove is communicated with the avoiding groove.
The linear motor according to claim 8, characterized in that

The two bottom covers are detachably covered on the lower surfaces of the left and right ends of the bottom plate respectively; the bottom cover is provided with a second through hole, the bottom plate is provided with a second screw hole corresponding to the second through hole, and the base further includes a second screw, the second screw passes through the second through hole and is threadedly connected to the second screw hole;

The linear motor further comprises a housing and two flexible connectors, wherein the housing has an inner cavity and a top opening communicating with the inner cavity;

The motion unit, the driving unit and the elastic support unit are all located in the inner cavity, and the connections between the left and right side walls of the outer shell and the bottom wall of the outer shell are chamfered to form a first avoidance hole communicating with the inner cavity;

The two flexible connectors are respectively located on the left and right sides of the stator assembly, the upper end of the flexible connector is fixedly connected to the edge of the top opening, and the lower end is fixedly connected to the base; the lower middle part of the flexible connector and the base are exposed in the first avoidance hole.
The linear motor according to any one of claims 3 to 5 is characterized in that the base includes a bottom plate, a positioning column and two fixed plates, the two fixed plates extend downward from the bottom plate and are arranged opposite to each other in the front-to-back direction, the positioning column extends along the front-to-back direction and both ends are fixedly connected to the two fixed plates respectively; the energy storage reset part is sleeved on the positioning column.
The linear motor according to claim 11, wherein:

The number of the coil windings and the number of the mandrels are both two;

The elastic support units are provided with two, and the energy storage reset parts of the two elastic support units are arranged at intervals in the left-right direction;

There are two positioning posts, the energy storage reset part of one elastic support unit is sleeved on one positioning post, and the energy storage reset part of the other elastic support unit is sleeved on the other positioning post;

The fixing plate comprises a transverse extension portion and a longitudinal extension portion extending upward from the upper edge of the transverse extension portion; the longitudinal extension portion is detachably fixed to the bottom plate; the left and right ends of the transverse extension portion are respectively fixedly connected to the two positioning posts.
The linear motor according to claim 12, characterized in that

The edge of the bottom plate is provided with a avoiding notch corresponding to the elastic arm, and a convex plate is formed between two adjacent avoiding notches on the same side of the bottom plate, and the fixing plate and the adjacent convex plate The outer end surface can be detachably fixed;

The longitudinal extension portion is provided with a third through hole, the outer end surface of the convex plate is provided with a third screw hole corresponding to the third through hole, and the base further includes a third screw, the third screw passes through the third through hole and is threadedly connected to the third screw hole;

The linear motor further comprises a housing and two flexible connectors, wherein the housing has an inner cavity and a top opening communicating with the inner cavity;

The motion unit, the driving unit and the elastic support unit are all located in the inner cavity, and the front and rear side walls of the shell are provided with second avoidance holes corresponding to the adjacent fixing plates;

The two flexible connectors are respectively located on the left and right sides of the stator assembly; the upper ends of the flexible connectors are fixedly connected to the edge of the top opening, and the lower ends are fixedly connected to the base.
The linear motor according to claim 11 is characterized in that the positioning column includes a fixed shaft and a buffer sleeve sleeved on the fixed shaft, and both ends of the fixed shaft are respectively fixedly connected to the two fixed plates.
The linear motor according to any one of claims 2 to 5, characterized in that:

The number of the coil windings and the number of the mandrels are both two;

The elastic support units are provided with two, and the energy storage reset parts of the two elastic support units are arranged at intervals in the left-right direction;

The linear motor further comprises a housing and two flexible connectors, wherein the housing has an inner cavity and a top opening communicating with the inner cavity;

The motion unit, drive unit and elastic support unit are all located in the inner cavity, the two flexible connectors are respectively located on the left and right sides of the stator assembly, the upper end of the flexible connector is fixedly connected to the edge of the top opening, and the lower end is fixedly connected to the base.