Linear motor

Abstract

The application discloses a linear motor, comprising a motion unit, a driving unit and an elastic support unit connecting the motion unit and the driving unit, the motion unit comprising a top base and a magnet; the driving unit comprising a bottom base and a stator assembly, the stator assembly comprising a core and a plurality of coil windings, the core comprising a connecting part fixedly connected with the bottom base and a plurality of core shafts extending upward from the connecting part, the plurality of core shafts being arranged in intervals in the left-right direction; the plurality of coil windings being correspondingly sleeved on the plurality of core shafts; the elastic support unit comprising an elastic arm extending in the up-down direction, the elastic arm being located at the front side and / or the rear side of the stator assembly, the upper end of the elastic arm being connected with the top base, and the lower end being connected with the bottom base. The elastic arm of the linear motor is arranged at the front side and / or the rear side of the stator assembly, so that the linear motor can be installed in a smaller installation space in the arrangement direction of the coil windings.

Description

Technical Field

[0001] This application relates to the field of linear motor technology for realizing reciprocating, oscillating or vibrating motion, and more particularly to a linear motor. Background Technology

[0002] Portable care devices often use linear motors to drive actuators, such as the head of an electric shaver or the brush head of an electric toothbrush. A linear motor consists of 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. In a reciprocating linear motor, the permanent magnet moves back and forth at a certain frequency relative to the stator assembly. Therefore, a structural unit is needed to provide support to maintain the gap between the permanent magnet and the iron core, and another structural unit is needed to provide elasticity for the reciprocating motion. The structural unit that achieves both of these functions can be called an elastic support unit. Existing elastic support units are arranged along the direction of multiple coil windings. For example, if multiple coil windings are arranged in a left-right direction, then one elastic support unit is located at the left end of the linear motor, and another elastic support unit is located at the right end. Because the elastic support units also require space for movement on both sides in the left-right direction, the linear motor's left-right dimensions are relatively large, and the required installation space is correspondingly large, making it unsuitable for installations in narrower left-right directions. Summary of the Invention

[0003] The main objective of this application is to propose a linear motor that addresses the technical problem that existing linear motors have large coil winding arrangement dimensions, making them unsuitable for smaller installation spaces.

[0004] To achieve the above objectives, the linear motor proposed in this application includes a motion unit, a drive unit, and an elastic support unit connecting the motion unit and the drive unit.

[0005] The motion unit includes a top seat and a magnet fixedly connected to the top seat;

[0006] The drive unit is located below the motion unit and has a gap with the motion unit; the drive unit includes a base and a stator assembly, the stator assembly includes an iron core and multiple coil windings, the iron core includes a connecting part fixedly connected to the base and multiple spindles extending upward from the connecting part, the multiple spindles are arranged at intervals in the left-right direction; the multiple coil windings are correspondingly sleeved on the multiple spindles.

[0007] The elastic support unit includes an elastic arm extending in the vertical direction. The elastic arm is located on the front and / or 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.

[0008] Preferably, the elastic support unit further includes an energy storage and reset part, the elastic arm is fixedly connected to the energy storage and reset part, and the energy storage and reset part is fixedly installed on the base and located below the base.

[0009] Preferably, the energy storage and reset part is a helical spring structure extending spirally in the front-back direction, and the elastic arm is a rod-shaped part extending from one end of the energy storage and reset part;

[0010] The elastic support unit further includes an upper torsion arm and a lower torsion arm. The upper torsion arm extends from the upper end of the elastic arm toward the center surface located in the front-rear direction and is fixedly connected to the top seat. The lower torsion arm extends from the other end of the energy storage and reset part and is fixedly installed on the base.

[0011] Preferably, the elastic support unit includes two energy storage and reset parts, which are spaced apart in the front-rear direction. Each of the two energy storage and reset parts is connected to an elastic arm at its opposite ends and a lower torsion arm at its close ends. Each elastic arm is connected to an upper torsion arm at its upper end, and the two upper torsion arms are connected to form an integral structure extending in the front-rear direction.

[0012] Preferably, the top seat includes a top plate and a top cover that is fixedly fitted onto the upper surface of the top plate. The lower surface of the top cover is provided with a first half-groove, and 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 joined at the joint between the top plate and the top cover to form an upper fixing hole that is adapted to the upper torsion arm. The magnet is fixedly connected to the lower surface of the top plate.

[0013] Preferably, the top cover is detachably fitted onto 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.

[0014] Preferably, the base includes a base plate and a bottom cover that is fixedly fitted onto the lower surface of the base plate, and the lower torsion arm extends adjacent to the lower surface of the base plate; the lower surface of the base plate is provided with a third semi-groove, and the upper surface of the bottom cover is provided with a fourth semi-groove corresponding to the third semi-groove; the third semi-groove and the fourth semi-groove surround the joint between the base 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 base plate.

[0015] Preferably, the number of coil windings and the number of mandrels are both two;

[0016] Two elastic support units are provided, and the energy storage and reset parts of the two elastic support units are spaced apart in the left-right direction; two bottom covers are provided, 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 and reset parts of the two elastic support units are located between the two bottom covers.

[0017] Preferably, the lower surface of the base plate is provided with a clearance groove corresponding to the energy storage and reset part, and the third half groove is connected to the clearance groove.

[0018] Preferably, the two bottom covers are detachably fitted onto the lower surfaces of the left and right ends of the base plate; the bottom cover is provided with a second through hole, the base plate is provided with a second screw hole corresponding to the second through hole, and the base also includes a second screw, which passes through the second through hole and is threadedly connected to the second screw hole;

[0019] The linear motor also includes a housing and two flexible connectors, the housing having an inner cavity and a top opening communicating with the inner cavity;

[0020] The motion unit, drive unit, and elastic support unit are all located in the inner cavity. The left and right side walls of the outer shell are chamfered at the connection with the bottom wall of the outer shell to form a first clearance hole communicating with the inner cavity.

[0021] The two flexible connectors are located on the left and right sides of the stator assembly, respectively. 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 through the first clearance hole.

[0022] Preferably, the base includes a base plate, a positioning post, and two fixing plates. The two fixing plates extend downward from the base plate and are arranged opposite each other in the front-to-back direction. The positioning post extends in the front-to-back direction and its two ends are fixedly connected to the two fixing plates respectively. The energy storage and reset part is sleeved on the positioning post.

[0023] Preferably, the number of coil windings and the number of mandrels are both two;

[0024] The elastic support unit is provided in two parts, and the energy storage and reset parts of the two elastic support units are spaced apart in the left-right direction.

[0025] The positioning post is provided in two parts. The energy storage and reset part of one elastic support unit is sleeved on one positioning post, and the energy storage and reset part of the other elastic support unit is sleeved on the other positioning post.

[0026] The fixing plate includes a lateral extension and a longitudinal extension extending upward from the upper edge of the lateral extension; the longitudinal extension is detachably fixed to the base plate; the left and right ends of the lateral extension are respectively fixedly connected to the two positioning posts.

[0027] Preferably, the edge of the base plate is provided with a clearance notch corresponding to the elastic arm, and a protrusion is formed between two adjacent clearance notches on the same side of the base plate. The fixing plate is detachably fixed to the outer end face of the adjacent protrusion.

[0028] The longitudinal extension is provided with a third through hole, and the outer end face of the convex plate is provided with a third screw hole corresponding to the third through hole. The base also includes a third screw, which passes through the third through hole and is threadedly connected to the third screw hole.

[0029] The linear motor also includes a housing and two flexible connectors, the housing having an inner cavity and a top opening communicating with the inner cavity;

[0030] The motion unit, drive unit, and elastic support unit are all located in the inner cavity, and the front and rear sidewalls of the outer shell are provided with second clearance holes corresponding to the adjacent fixing plate.

[0031] The two flexible connectors are located on the left and right sides of the stator assembly, respectively. 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.

[0032] Preferably, the positioning post includes a fixed shaft and a buffer sleeve sleeved on the fixed shaft, and the two ends of the fixed shaft are respectively fixedly connected to the two fixed plates.

[0033] Preferably, the number of coil windings and the number of mandrels are both two;

[0034] The elastic support unit is provided in two parts, and the energy storage and reset parts of the two elastic support units are spaced apart in the left-right direction.

[0035] The linear motor also includes a housing and two flexible connectors, the housing having an inner cavity and a top opening communicating with the inner cavity;

[0036] The motion unit, drive unit, and elastic support unit are all located in the inner cavity. The two flexible connectors are located on the left and right sides of the stator assembly, respectively. 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.

[0037] The linear motor of the present invention provides an elastic arm on the front and / or rear side of the stator assembly to connect the top seat of the motion unit and the base of the drive unit. The movable space of the elastic arm is also located on the front and / or rear side of the stator assembly, thereby saving space in the coil winding arrangement direction. This makes the linear motor more adaptable to installation and suitable for installation spaces with narrower coil winding arrangement directions. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a three-dimensional structural diagram of the linear motor of the present invention with the top facing upwards;

[0040] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of a linear motor with its bottom facing upwards;

[0041] Figure 3 for Figure 1 Exploded view of the structure of a linear motor;

[0042] Figure 4 for Figure 1 A top view of the structure of a linear motor;

[0043] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure along the VV line in the middle;

[0044] Figure 6 for Figure 4 A schematic diagram of the cross-sectional structure along line VI-VI;

[0045] Figure 7 for Figure 3 Another schematic diagram of the exploded structure of the moving unit;

[0046] Figure 8 for Figure 3 A three-dimensional structural diagram of the central base from another angle;

[0047] Figure 9 for Figure 8 Exploded view of the central base;

[0048] Figure 10 for Figure 3 Exploded view of the flexible connector.

[0049] Explanation of icon numbers:

[0050]

[0051] Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0053] Reference Figures 1 to 6 In one embodiment, the linear motor 100 proposed in this 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.

[0054] The motion unit 10 includes a top seat 11 and a magnet 20 fixedly connected to the top seat 11;

[0055] The drive unit 25 is located below the motion unit 10 and has a gap 60 between it and the motion unit 10. The drive 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 part 47 fixedly connected to the base 26 and a plurality of spindles 48 extending upward from the connecting part 47. The plurality of spindles 48 are arranged at intervals in the left-right direction. The plurality of coil windings 49 are correspondingly sleeved on the plurality of spindles 48.

[0056] The elastic support unit 55 includes an elastic arm 56 extending in the vertical direction. The elastic arm 56 is located on the front and / or 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.

[0057] In this embodiment, the motion unit 10 reciprocates under magnetic drive. To facilitate connection with actuators, such as the head of a razor or the brush head of an electric toothbrush, the motion unit 10 may also include an output shaft fixedly connected to the top seat 11. To achieve sufficient strength in a small volume, the top seat 11 and the base 26 are preferably made of steel. The stator assembly 45 of the drive unit 25 generates an electromagnetic field to drive the motion unit 10 when energized. The stator assembly 45 typically includes two coil windings 49, but more can be provided as needed, such as three, four, etc. The coil windings 49 include an insulating bobbin and a coil wound on the bobbin. The bobbins between different coil windings 49 can be integrally set or separately set. The elastic arm 56 can accumulate elastic potential energy when bent, thereby driving the motion unit 10 to reset when the electromagnetic force weakens.

[0058] The linear motor 100 of the present invention connects the top seat 11 of the motion unit 10 and the base 26 of the drive unit 25 by providing an elastic arm 56 on the front and / or rear side of the stator assembly 45. Thus, the movable space of the elastic arm 56 is also located on the front and / or rear side of the stator assembly 45, thereby saving space in the arrangement direction of the coil windings 49. This makes the linear motor 100 more adaptable to installation and can be suitable for installation spaces with narrower coil winding arrangement directions.

[0059] Furthermore, in order to further improve the compactness of the structure, the elastic support unit 55 also includes an energy storage and reset part 57. The elastic arm 56 is fixedly connected to the energy storage and reset part 57. In this way, the elastic arm 56 can accumulate more potential energy with a relatively small activity space by means of the energy storage and reset part 57. The energy storage and reset part 57 is fixedly installed on the base 26 and located below the base 26, so that the space below the base 26 can be better utilized.

[0060] Furthermore, the energy storage and reset part 57 is a helical spring structure that extends spirally in the front-back direction, and the elastic arm 56 is a rod-shaped part extending from one end of the energy storage and reset part 57.

[0061] 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 toward the center surface located in the front-rear direction and is fixedly connected to the top seat 11. The lower torsion arm 59 extends from the other end of the energy storage and reset part 57 and is fixedly installed on the base 26.

[0062] In this embodiment, the energy storage and reset part 57 of the elastic support unit 55 is a helical spring structure. Thus, the elastic arm 56, upper torsion arm 58, and lower torsion arm 59 can be directly extended from the helical spring structure, allowing the elastic support unit 55 to be integrally formed by bending a rod-shaped material. The upper and lower ends of the elastic arm 56 are fixedly connected to the top seat 11 and the base 26 via the upper torsion arm 58 and lower torsion arm 59, respectively. This facilitates assembly and also makes it easier to ensure connection strength.

[0063] Furthermore, the elastic support unit 55 includes two energy storage and reset parts 57, which are spaced apart in the front-back direction. Each of the two energy storage and reset parts 57 is connected to an elastic arm 56 at its opposite ends and a lower torsion arm 59 at its close ends. Each elastic arm 56 is connected to an upper torsion arm 58 at its upper end, and the two upper torsion arms 58 are connected to form an integral structure extending in the front-back direction.

[0064] In this embodiment, by providing two energy storage and reset parts 57, the energy storage intensity can be further increased, thereby reducing the required activity space of the elastic arm 56. Since each energy storage and reset part 57 is connected to an elastic arm 56, the elastic support unit 55 can form a more balanced elastic support and reset function on both sides of the center plane in the front-rear direction.

[0065] Furthermore, please refer to the following: Figure 7 In one embodiment, the top seat 11 includes a top plate 12 and a top cover 15 fixedly fitted onto the upper surface of the top plate 12. The lower surface of the top cover 15 is provided with a first half groove 13, and the upper surface of the top plate 12 is provided with a second half groove 16 corresponding to the first half groove 13. The first half groove 13 and the second half groove 16 surround the joint between the top plate 12 and the top cover 15 to form an upper fixing hole 18 that is adapted to the upper torsion arm 58. The magnet 20 is fixedly connected to the lower surface of the top plate 12.

[0066] In this embodiment, the top seat 11 clamps and fixes the upper torsion arm 58 by the top plate 12 and the top cover 15, thereby making the assembly of the upper torsion arm 58 easier, and the upper torsion arm 58 passes through the upper fixing hole 18, thus playing a good limiting role. In some embodiments, the upper torsion arm 58 can also rotate within the upper fixing hole 18.

[0067] Furthermore, the top cover 15 is detachably fitted onto 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, which passes through the first through hole 17 and is threadedly connected to the first screw hole 14.

[0068] 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.

[0069] Furthermore, referring to Figures 1 to 6 , Figure 8 and Figure 9 In one embodiment, the base 26 includes a base plate 27 and a bottom cover 33 fixedly covering the lower surface of the base plate 27. The lower torsion arm 59 extends adjacent to the lower surface of the base plate 27. The lower surface of the base plate 27 is provided with a third semi-groove 28, and the upper surface of the bottom cover 33 is provided with a fourth semi-groove 34 corresponding to the third semi-groove 28. The third semi-groove 28 and the fourth semi-groove 34 surround the joint between the base plate 27 and the bottom cover 33 to form a lower fixing hole 36 that is adapted to the lower torsion arm 59. The iron core 46 is fixedly connected to the base plate 27.

[0070] In this embodiment, similar to the fixing of the upper torsion arm 58, the lower torsion arm 59 is fixed by clamping the bottom plate 27 and the bottom cover 33. This makes the assembly of the lower torsion arm 59 easier, and the lower fixing hole 36 can also play a good limiting role for the lower torsion arm 59.

[0071] Furthermore, the number of coil windings 49 and the number of spindles 48 are both two;

[0072] Two elastic support units 55 are provided, and the energy storage and reset parts 57 of the two elastic support units 55 are spaced apart in the left and right directions; two bottom covers 33 are provided, 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 and reset parts 57 of the two elastic support units 55 are located between the two bottom covers 33.

[0073] In this embodiment, by setting 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-rear direction. By reasonably arranging the spatial positions of the two bottom covers 33 and the two energy storage and reset parts 57, both the fixing strength of the lower torsion arm 59 and the balance of the energy storage and reset parts 57 are ensured, and the compactness of the structure is also achieved.

[0074] Furthermore, in order to save installation space in the vertical direction and reduce the height of the linear motor 100, the lower surface of the base plate 27 is provided with a relief groove 29 corresponding to the energy storage and reset part 57. The third half groove 28 is connected to the relief groove 29, so that the lower torsion arm 59 can extend directly in the left and right direction.

[0075] Furthermore, in order to enable the detachable installation of the lower torsion arm 59, two bottom covers 33 are detachably fitted onto the lower surfaces of the left and right ends of the base plate 27 respectively; the bottom cover 33 is provided with a second through hole 35, the base plate 27 is provided with a second screw hole 30 corresponding to the second through hole 35, and the base 26 also includes a second screw 37, which passes through the second through hole 35 and is threadedly connected to the second screw hole 30.

[0076] The linear motor 100 also includes a housing 65 and two flexible connectors 75. The housing 65 has an inner cavity 66 and a top opening 67 communicating with the inner cavity 66.

[0077] The motion unit 10, drive unit 25, and elastic support unit 55 are all located in the inner cavity 66. In order to further reduce the external size of the linear motor 100, the left and right side walls of the housing 65 are chamfered at the connection with the bottom wall of the housing 65 to form a first clearance hole 68 communicating with the inner cavity 66;

[0078] Two flexible connectors 75 are located on the left and right sides of the stator assembly 45, respectively. 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 clearance hole 68.

[0079] In this embodiment, a flexible connector 75 is provided to connect the housing 65 and the drive unit 25. In this way, a portion of the vibration of the drive unit 25 can be buffered, thereby reducing the noise of the linear motor 100.

[0080] Furthermore, the base 26 includes a base plate 27, a positioning post 38, and two fixing plates 41. The two fixing plates 41 extend downward from the base plate 27 and are arranged opposite each other in the front-back direction. The positioning post 38 extends in the front-back direction and is fixedly connected to the two fixing plates 41 at both ends. The energy storage and reset part 57 is sleeved on the positioning post 38. This can prevent the energy storage and reset part 57 from becoming loose and ensure that the energy storage and reset part 57 deforms in a preset direction, thereby ensuring the smoothness of the reciprocating motion.

[0081] Furthermore, the number of coil windings 49 and the number of spindles 48 are both two;

[0082] Two elastic support units 55 are provided, and the energy storage and reset parts 57 of the two elastic support units 55 are spaced apart in the left and right directions.

[0083] There are two positioning posts 38. The energy storage and reset part 57 of one elastic support unit 55 is sleeved on one positioning post 38, and the energy storage and reset part 57 of the other elastic support unit 55 is sleeved on the other positioning post 38.

[0084] The fixing plate 41 includes a lateral extension 41 and a longitudinal extension 42 extending upward from the upper edge of the lateral extension 41; the longitudinal extension 42 is detachably fixed to the base plate 27; the left and right ends of the lateral extension 41 are respectively fixedly connected to two positioning posts 38.

[0085] 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-rear direction. A fixed plate 41 connecting two positioning posts 38 reduces the number of components. Furthermore, by configuring the fixed plate 41 to include a lateral extension 41 and a longitudinal extension 42, the overall size of the fixed plate 41 is reduced, thereby lowering its weight and consequently reducing the overall weight of the linear motor 100.

[0086] Furthermore, the edge of the base plate 27 is provided with a clearance notch 31 corresponding to the elastic arm 56, and a protrusion 32 is formed between two adjacent clearance notches 31 on the same side of the base plate 27. The outer end face of the fixing plate 41 and the adjacent protrusion 32 can be detachably fixed.

[0087] The longitudinal extension 42 is provided with a third through hole 421, and the outer end face of the protrusion 32 is provided with a third screw hole 321 corresponding to the third through hole 421. The base 26 also includes a third screw 43, which passes through the third through hole 421 and is threadedly connected to the third screw hole 321.

[0088] The linear motor 100 also includes a housing 65 and two flexible connectors 75. The housing 65 has an inner cavity 66 and a top opening 67 communicating with the inner cavity 66.

[0089] 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 outer shell 65 are provided with second clearance holes 69 corresponding to the adjacent fixing plate 41.

[0090] Two flexible connectors 75 are located on the left and right sides of the stator assembly 45, respectively. 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.

[0091] In this embodiment, the elastic arm 56 is located within the clearance notch 31, which not only makes the structure more compact but also does not affect the swing of the elastic arm 56 itself. To ensure sufficient structural strength and reduce volume, the fixing plate 41 is preferably made of steel.

[0092] Furthermore, the positioning post 38 includes a fixed shaft 39 and a buffer sleeve 40 sleeved on the fixed shaft 39. The two ends of the fixed shaft 39 are respectively fixedly connected to two fixed plates 41.

[0093] In this embodiment, the energy storage reset part 57 contacts the buffer sleeve 40, so that a portion of the energy of the energy storage reset part 57 can be buffered by the buffer sleeve 40.

[0094] Furthermore, the number of coil windings 49 and the number of spindles 48 are both two;

[0095] Two elastic support units 55 are provided, and the energy storage and reset parts 57 of the two elastic support units 55 are spaced apart in the left and right directions.

[0096] The linear motor 100 also includes a housing 65 and two flexible connectors 75. The housing 65 has an inner cavity 66 and a top opening 67 communicating with the inner cavity 66.

[0097] The motion unit 10, drive unit 25 and elastic support unit 55 are all located in the inner cavity 66. Two flexible connectors 75 are located on the left and right sides of the stator assembly 45 respectively. 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.

[0098] 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-rear direction. By providing a flexible connector 75 to connect the housing 65 and the drive unit 25, some of the vibration of the drive unit 25 can be buffered, thereby reducing the noise of the linear motor 100.

[0099] Furthermore, referring to Figures 1 to 6 ,as well as Figure 10 In one embodiment, to fix the linear motor 100 to the main structure of the household appliance, the outer 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 clearance hole 68. In this way, the linear motor 100 can be fixed by passing a fastener through the through hole 71 on the fixing lug 70 and then connecting it to the fixing hole on the main structure.

[0100] Furthermore, the flexible connector 75 includes a spring piece 76 and two clamping pieces 81. The spring piece 76 is "U-shaped" and includes a fixed piece 77 and two swinging pieces 79 extending upward from both ends of the fixed piece 77. The two clamping pieces 81 are attached to the inner and outer sides of the fixed piece 77 and are fixedly connected to the fixed piece 77.

[0101] The flexible connector 75 has a positioning hole 83 that passes through the middle of the fixing piece 77 and two clamping pieces 81. The base 26 has a positioning boss 44 that is embedded in the positioning hole 83. The positioning boss 44 is welded and fixed to the positioning hole 83. The upper end of the swing piece 79 is fixedly connected to the edge of the top opening 67.

[0102] In this embodiment, the lower end of the spring piece 76 is pre-fixed by two clips 81, and the thickness of the flexible connector 75 and the depth of the positioning hole 83 are locally increased. In this way, it can be precisely pre-installed by fitting the positioning boss 44 through the positioning hole 83, and the connection position has sufficient strength after welding.

[0103] Furthermore, in order to achieve faster assembly, the fixing piece 77 is riveted to two clamping pieces 81. Each end of the fixing piece 77 is provided with a first connecting hole 78, and the clamping piece 81 is provided with a first riveting hole 82 corresponding to the first connecting hole 78. The flexible connector 75 also includes a first rivet 84 that passes through the first riveting hole 82 and the first connecting hole 78 to fix the fixing piece 77 and the clamping piece 81.

[0104] Furthermore, in order to facilitate the connection between the flexible connector 75 and the housing 65 and reduce stress concentration at the connection, the upper end of the swing plate 79 is provided with a second connection hole 80; the linear motor 100 also includes a gasket 85, which is long and strip-shaped and arranged in the front-back direction. Each end of the gasket 85 is provided with a second riveting hole 86, and the edge of the top opening 67 is provided with a third riveting hole 72. The flexible connector 75 also includes a second rivet, which is fixedly inserted through the second riveting hole 86, the second connection hole 80, and the second connection hole 80 to fix the upper end of the swing plate 79 to the edge of the top opening 67.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions 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 this application.

Claims

1. A linear motor, comprising a motion unit, a drive unit, and an elastic support unit connecting the motion unit and the drive unit, characterized in that, The motion unit includes a top seat and a magnet fixedly connected to the top seat; The drive unit is located below the motion unit and has a gap with the motion unit; the drive unit includes a base and a stator assembly, the stator assembly includes an iron core and multiple coil windings, the iron core includes a connecting part fixedly connected to the base and multiple spindles extending upward from the connecting part, the multiple spindles are arranged at intervals in the left-right direction; the multiple coil windings are correspondingly sleeved on the multiple spindles. The elastic support unit includes an elastic arm extending in the vertical direction. The elastic arm is located on the front and / or 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 also includes a housing and two flexible connectors. 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 located on the left and right sides of the stator assembly, respectively. 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.

2. The linear motor as described in claim 1, characterized in that, The elastic support unit also includes an energy storage and reset part. The elastic arm is fixedly connected to the energy storage and reset part, and the energy storage and reset part is fixedly installed on the base and located below the base.

3. The linear motor as described in claim 2, characterized in that, The energy storage and reset part is a helical spring structure that extends spirally in the front-back direction, and the elastic arm is a rod-shaped part that extends from one end of the energy storage and reset part. The elastic support unit further includes an upper torsion arm and a lower torsion arm. The upper torsion arm extends from the upper end of the elastic arm toward the center surface located in the front-rear direction and is fixedly connected to the top seat. The lower torsion arm extends from the other end of the energy storage and reset part and is fixedly installed on the base.

4. The linear motor as described in claim 3, characterized in that, The elastic support unit includes two energy storage and reset parts, which are spaced apart in the front-back direction. Each of the two energy storage and reset parts is connected to an elastic arm at its opposite ends and a lower torsion arm at its close ends. Each elastic arm is connected to an upper torsion arm at its upper end, and the two upper torsion arms are connected to form an integral structure extending in the front-back direction.

5. The linear motor as described in claim 3, characterized in that, The top seat includes a top plate and a top cover that is fixedly fitted onto the upper surface of the top plate. The lower surface of the top cover is provided with a first half-groove, and 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 joined at the joint between the top plate and the top cover to form an upper fixing hole that is adapted to the upper torsion arm. The magnet is fixedly connected to the lower surface of the top plate.

6. The linear motor as described in claim 5, characterized in that, The top cover is detachably fitted onto the upper surface of the top plate. The top cover has a first through hole, and the top plate has a first screw hole corresponding to the first through hole. The top seat also includes a first screw, which passes through the first through hole and is threadedly connected to the first screw hole.

7. The linear motor according to any one of claims 3-5, characterized in that, The base includes a base plate and a bottom cover that is fixedly fitted onto the lower surface of the base plate. The lower torsion arm extends adjacent to the lower surface of the base plate. The lower surface of the base plate is provided with a third semi-groove, and the upper surface of the bottom cover is provided with a fourth semi-groove corresponding to the third semi-groove. The third and fourth semi-grooves surround the joint between the base plate and the bottom cover to form a lower fixing hole that is adapted to the lower torsion arm. The iron core is fixedly connected to the base plate.

8. The linear motor as described in claim 7, characterized in that, The number of coil windings and the number of mandrels are both two; Two elastic support units are provided, and the energy storage and reset parts of the two elastic support units are spaced apart in the left-right direction; two bottom covers are provided, 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 and reset parts of the two elastic support units are located between the two bottom covers.

9. The linear motor as described in claim 8, characterized in that, The lower surface of the base plate is provided with a clearance groove corresponding to the energy storage and reset part, and the third half groove is connected to the clearance groove.

10. The linear motor as claimed in claim 8, characterized in that, The two bottom covers are detachably fitted onto the lower surfaces of the left and right ends of the base plate; the bottom cover is provided with a second through hole, the base plate is provided with a second screw hole corresponding to the second through hole, and the base also includes a second screw, which passes through the second through hole and is threadedly connected to the second screw hole; The left and right side walls of the outer shell are chamfered at the connection points with the bottom wall of the outer shell to form a first clearance hole communicating with the inner cavity; The lower middle part of the flexible connector and the base are exposed outside the first clearance hole.

11. The linear motor according to any one of claims 3-5, characterized in that, The base includes a base plate, a positioning post, and two fixing plates. The two fixing plates extend downward from the base plate and are arranged opposite each other in the front-back direction. The positioning post extends in the front-back direction and its two ends are fixedly connected to the two fixing plates respectively. The energy storage and reset part is sleeved on the positioning post.

12. The linear motor as claimed in claim 11, characterized in that, The number of coil windings and the number of mandrels are both two; The elastic support unit is provided in two parts, and the energy storage and reset parts of the two elastic support units are spaced apart in the left-right direction. The positioning post is provided in two parts. The energy storage and reset part of one elastic support unit is sleeved on one positioning post, and the energy storage and reset part of the other elastic support unit is sleeved on the other positioning post. The fixing plate includes a lateral extension and a longitudinal extension extending upward from the upper edge of the lateral extension; the longitudinal extension is detachably fixed to the base plate; the left and right ends of the lateral extension are respectively fixedly connected to the two positioning posts.

13. The linear motor as claimed in claim 12, characterized in that, The edge of the base plate is provided with a clearance notch corresponding to the elastic arm. A protrusion is formed between two adjacent clearance notches on the same side of the base plate. The fixing plate is detachably fixed to the outer end face of the adjacent protrusion. The longitudinal extension is provided with a third through hole, and the outer end face of the convex plate is provided with a third screw hole corresponding to the third through hole. The base also includes a third screw, which passes through the third through hole and is threadedly connected to the third screw hole. The linear motor also includes a housing and two flexible connectors, the housing having 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, and the front and rear sidewalls of the outer shell are provided with second clearance holes corresponding to the adjacent fixing plate. The two flexible connectors are located on the left and right sides of the stator assembly, respectively. 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.

14. The linear motor as claimed in claim 11, characterized in that, The positioning post includes a fixed shaft and a buffer sleeve sleeved on the fixed shaft. The two ends of the fixed shaft are respectively fixedly connected to the two fixed plates.

15. The linear motor according to any one of claims 2-5, characterized in that, The number of coil windings and the number of mandrels are both two; The elastic support unit is provided in two parts, and the energy storage and reset parts of the two elastic support units are spaced apart in the left-right direction. The linear motor also includes a housing and two flexible connectors, the housing having 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 located on the left and right sides of the stator assembly, respectively. 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.

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