Linear motor

Abstract

The invention provides a linear motor. The linear motor comprises a shell, a cover body connected with the shell to form a containing space, a rotor contained in the containing space, a stator and an elastic piece, the rotor comprises a mass block provided with a mounting cavity and a first magnetic structure fixed in the mounting cavity, and the stator comprises a coil assembly contained in the mounting cavity and a circuit board. The first magnetic structures are located on the two sides of the coil assembly in the first direction. The circuit board comprises inner bonding pads located on the two sides of the coil assembly in the second direction and connecting parts connected with the inner bonding pads, the inner bonding pads are located in the first magnetic gaps of the first magnetic structures, and the connecting parts at least partially coincide with the projections of the first magnetic structures in the third direction; the first direction, the second direction and the third direction are mutually orthogonal, and the second direction is parallel to the vibration direction of the rotor; the mass block is provided with an avoiding groove to avoid the inner bonding pad. According to the linear motor, the height of the first magnetic structure can be increased, and the driving force is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of motors, and particularly relates to a linear motor. BACKGROUND

[0002] The linear motor generally comprises a shell, a coil and a magnetic steel accommodated in the shell, and a circuit board electrically connected with the coil and led out of the shell, the coil is arranged between the magnetic steels, the coil is electrically connected with the circuit board through soldering on the solder pad of the circuit board, and the coil drives the magnetic steel to vibrate after being electrified.

[0003] In the related art, the solder pad of the circuit board is generally arranged on the opposite sides of the coil, the lead wire of the coil is soldered with the solder pad, in order to protect the lead wire of the coil and make the overall structure relatively compact, the solder pad is generally arranged on one side of the magnetic steel along the height direction, and a sufficient safety space is reserved between the magnetic steel and the solder pad part, however, this will reduce the height of the magnetic steel and affect the vibration of the magnetic steel, thereby reducing the driving force of the linear motor, and it is difficult to meet the demand of the consumer electronic product for better vibration feedback effect.

[0004] Therefore, it is necessary to provide a new linear motor. SUMMARY

[0005] The application aims to provide a linear motor capable of improving the driving force of the motor.

[0006] The technical scheme of the application is as follows:

[0007] A linear motor comprises a shell, a cover connected with the shell to form an accommodation space, a mover accommodated in the accommodation space, a stator driving the mover to vibrate, and an elastic piece suspending the mover in the accommodation space, the mover comprises a mass block provided with a mounting cavity and a first magnetic structure fixed in the mounting cavity, the stator comprises a coil assembly fixed to the shell and accommodated in the mounting cavity and a circuit board electrically connected with the coil assembly, and the first magnetic structure is located on both sides of the coil assembly along a first direction; the circuit board comprises inner solder pads located on both sides of the coil assembly along a second direction and a connecting part connecting the inner solder pads, the inner solder pads are located in first magnetic gaps of the first magnetic structure, and the connecting part at least partially overlaps with a projection of the first magnetic structure along a third direction; the first direction, the second direction and the third direction are orthogonal to each other, and the second direction is parallel to the vibration direction of the mover, the mass block comprises a bottom surface facing the circuit board along the third direction and a top surface corresponding to the bottom surface, the mass block is provided with an avoiding groove recessed from the bottom surface to the top surface, and the avoiding groove is communicated with the mounting cavity to avoid the inner solder pads.

[0008] Further, in some embodiments, the mover further comprises a second magnetic structure fixed in the mounting cavity and located on both sides of the coil assembly along the second direction; the inner pad is located in a second magnetic gap of the second magnetic structure.

[0009] Further, in some embodiments, the circuit board is fixedly connected to the housing, a side of the housing along the second direction is provided with an opening, the cover body comprises a cover portion extending along a third direction and covering the opening, the cover portion is provided with a communication hole for communication between the outside and the accommodation space, and the circuit board extends to the outside of the accommodation space through the communication hole.

[0010] Further, in some embodiments, a side of the housing along the second direction comprises an extension portion protruding out of the accommodation space, the circuit board further comprises an outer pad connected to a side of the connecting portion away from the inner pad along the second direction and used for connecting with an external circuit, and the outer pad is located outside the accommodation space and fixed to the extension portion.

[0011] Further, in some embodiments, the cover body further comprises a first body portion arranged orthogonally to the cover portion, the housing further comprises a second body portion arranged in parallel to the first body portion, and a surrounding portion located between the first body portion and the second body portion and surrounding to define the accommodation space, the opening is arranged on the surrounding portion, the extension portion is connected to the second body portion, and the second body portion, the surrounding portion and the extension portion are integrally formed.

[0012] Further, in some embodiments, the mass is fixed to the housing through the elastic member, and the mass is located on a side of the circuit board away from the housing.

[0013] Further, in some embodiments, the linear motor is further provided with a baffle, the baffle is fixedly connected to the cover body, the mass is provided with a recessed slot recessed from the top surface to the bottom surface, the recessed slot is in communication with the mounting cavity to avoid the baffle, and in the movement process of the linear motor, the side wall of the recessed slot abuts against the baffle to limit the movement stroke of the mass.

[0014] Further, in some embodiments, the coil assembly comprises a coil and a skeleton, the skeleton is fixedly connected to the housing, and the coil is wound on the skeleton.

[0015] Further, in some embodiments, the skeleton comprises a main body structure and connecting structures connected to both sides of the main body structure along the second direction, the coil is wound on the main body structure, and the connecting structures are connected to the housing; the connecting structures are provided with notches penetrating along the second direction for the lead wires of the coil to pass through.

[0016] Further, in some embodiments, the coil assembly has a long axis side and a short axis side, and the inner pads are located on both sides of the long axis side of the coil assembly.

[0017] The present application has the advantages that the inner pads and the first magnetic structure are arranged in different directions of the coil assembly, and the inner pads are arranged in the first magnetic gap of the first magnetic structure, so that the inner pads and the first magnetic structure are spaced apart, thus the first magnetic structure does not need to provide a space for the inner pads to avoid, compared with the inner pads being arranged on one side of the first magnetic structure in the height direction in the related art, the present application can increase the height of the first magnetic structure, improve the driving force of the linear motor, and enhance the vibration feeling of the linear motor. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a perspective view of a linear motor according to an embodiment of the present application;

[0019] Figure 2 FIG. 2 is a sectional view of the linear motor along direction A-A in FIG. 1; Figure 1

[0020] Figure 3 FIG. 3 is a sectional view of the linear motor along direction B-B in FIG. 1; Figure 1

[0021] Figure 4 FIG. 4 is a perspective view of a linear motor according to another embodiment of the present application;

[0022] Figure 5 FIG. 5 is a connection diagram of a coil assembly and a circuit board according to an embodiment of the present application;

[0023] Figure 6 FIG. 6 is a partial structure diagram of a linear motor according to another embodiment of the present application.

[0024] In the drawings, the reference signs represent: 1, housing; 10, opening; 11, extension; 12, second main body part; 13, enclosing part; 2, cover; 21, covering part; 211, communication hole; 22, first main body part; 3, coil assembly; 31, coil; 32, skeleton; 321, main body structure; 322, connection structure; 3221, notch; 4, elastic member; 5, mover; 51, first magnetic structure; 511, first magnetic gap; 52, second magnetic structure; 521, second magnetic gap; 53, mass block; 531, avoiding slot; 532, mounting cavity; 533, accommodating slot; 534, embedding slot; 535, top surface; 536, bottom surface; 6, circuit board; 61, inner pad; 62, connection part; 63, outer pad; 7, damping member; 71, protrusion; 8, baffle. DETAILED DESCRIPTION

[0025] ​​In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0027] The present application will be further described below in conjunction with the drawings and embodiments.

[0028] Please refer to Figures 1 to 6 A linear motor, comprising a housing 1, a cover 2 connected with the housing 1 to form a receiving space, a mover 5 received in the receiving space, a stator driving the mover 5 to vibrate, and an elastic member 4 suspending the mover 5 in the receiving space, the mover 5 comprising a mass block 53 provided with a mounting cavity 532 and a first magnetic structure 51 fixedly installed in the mounting cavity 532, the stator comprising a coil assembly 3 fixed to the housing 1 and received in the mounting cavity 532, and a circuit board 6 electrically connected with the coil assembly 3, the first magnetic structure 51 being located on both sides of the coil assembly 3 along a first direction; the circuit board 6 comprising inner pads 61 located at both ends of the coil assembly 3 along a second direction and a connecting portion 62 connecting the inner pads 61, the inner pads 61 being located in a first magnetic gap 511 of the first magnetic structure 51, the connecting portion 62 and the first magnetic structure 51 at least partially overlapping in projection along a third direction, the first direction, the second direction and the third direction being orthogonal to each other, and the second direction being parallel to the vibration direction of the mover. As Figure 2As shown, the mass 53 includes a bottom surface 536 facing the circuit board 6 along the third direction and a top surface 535 corresponding to the bottom surface 536, the mass 53 is provided with a relief groove 531 recessed from the bottom surface 536 to the top surface 535, the relief groove 531 is in communication with the mounting cavity 532 to avoid the inner pad 61. In the embodiment of the present application, the coil assembly 3 is a solenoid, including a long axis side and a short axis side, the long axis side is parallel to the vibration direction of the mover, the inner pad 61 and the first magnetic structure 51 are arranged in different directions of the coil assembly 3, for example, the inner pad 61 is arranged on both sides of the coil assembly 3 along the long axis side thereof, and the first magnetic structure 51 is arranged on both sides of the coil assembly 3 along the short axis side thereof, and the inner pad 61 is arranged in the first magnetic gap 511 of the first magnetic structure 51, so that the inner pad 61 and the first magnetic structure 51 are spaced apart, therefore, the first magnetic structure 51 does not need to provide space for the inner pad 61 to avoid, compared with the related art that the inner pad 61 is on one side of the first magnetic structure 51 along the height direction, the embodiment of the present application can increase the height of the first magnetic structure 51, improve the driving force of the linear motor, and enhance the vibration feeling of the linear motor.

[0029] In addition, the projection of the connecting part 62 and the first magnetic structure 51 in the third direction at least partially coincides, so that the overall structure can be more compact. It should be understood that since the connecting part 62 is only used to connect the inner pad 61 and does not need to connect the lead of the coil assembly 3, even if the projection of the first magnetic structure 51 and the connecting part 62 in the third direction coincides, the height of the first magnetic structure 51 does not need to be reduced, compared with the technical solution that the first magnetic structure 51 needs to avoid the lead in the related art, the embodiment of the present application can improve the driving force of the motor while ensuring compactness.

[0030] In addition, the inner pads 61 are spaced apart along the second direction, and the connecting part 62 can connect the inner pads 61, so that the coil assembly 3 can be connected to the inner pads 61, realizing the electrical connection of the coil assembly 3 and the circuit board 6.

[0031] Furthermore, for example, taking the side of the circuit board 6 provided with the inner pad 61 along the third direction as the upper side, the relief groove 531 avoiding the inner pad 61 is opened on the bottom surface 536 of the mass 53, so that the lead of the coil assembly 3 can be connected to the inner pad 61 through the relief groove 531, and the lead of the coil assembly 3 can be protected. Through the design of the relief groove 531, space is provided for the inner pad 61 to avoid, ensuring the reliable connection of the inner pad 61 and the lead of the coil assembly 3, and avoiding the physical interference or short circuit risk of the mass 53 to the inner pad 61. Thus, the stability and safety of the circuit connection are ensured.

[0032] It can be understood that the third direction is the direction of the height of the first magnetic structure 51. For example, Figure 1As shown, the first direction is the X-axis direction, the second direction is the Y-axis direction, and the third direction is the Z-axis direction.

[0033] For example, the first magnetic structure 51 and the mass 53 are welded, and the mass 53 and the first magnetic structure 51 together serve as the mover 5. By arranging the mass 53, the vibration feeling of the linear motor can be improved.

[0034] For example, the first magnetic structure 51 can be a magnetic steel or a magnet or the like.

[0035] It should be noted that in the embodiment of the present application, the height of the first magnetic structure 51 is increased mainly by arranging the directions of the inner pads 61 and the first magnetic structure 51 arranged in different directions of the coil assembly 3. Therefore, the specific number of the inner pads 61 can not be limited. For example, in some implementation manners, one side along the second direction of the coil assembly 3 can have one inner pad 61, and the other side can also have one inner pad 61; in some implementation manners, one side along the second direction of the coil assembly 3 can have two inner pads 61, and the other side can have one inner pad 61; in some implementation manners, one side along the second direction of the coil assembly 3 can have three inner pads 61, and the other side can have two inner pads 61, which will not be described here.

[0036] In the embodiment of the present application, the circuit board 6 is fixedly connected to the housing 1, the housing 1 is provided with an opening 10 on one side along the second direction, the cover 2 includes a covering portion 21 extending along the third direction and covering the opening 10, the covering portion 21 is provided with a communication hole 211 communicating the outside and the accommodation space, the circuit board 6 extends to the outside of the accommodation space through the communication hole 211, and the third direction is orthogonal to the first direction and orthogonal to the second direction.

[0037] Specifically, the covering portion 21 covers the opening 10, the communication hole 211 is arranged on the covering portion 21, and the circuit board 6 is partially arranged in the accommodation space to communicate with the coil 31 and partially extends to the outside of the accommodation space through the communication hole 211. In this way, the circuit board 6 can be electrically connected to the external circuit through the part located outside the accommodation space.

[0038] In the embodiment of the present application, the housing 1 includes an extension 11 protruding out of the accommodation space on one side along the second direction, and the circuit board 6 further includes an outer pad 63 connected to the external circuit. The outer pad 63 is located outside the accommodation space and is fixed to the extension 11. Specifically, the outer pad 63 is connected to the side of the connecting portion 62 away from the inner pad 61 to be located outside the accommodation space, so as to be connected to the external circuit board. The housing 1 is provided with the extension 11 corresponding to the outer pad 63. In this way, the extension 11 can provide mechanical support for the outer pad 63 of the circuit board 6.

[0039] In the embodiment of the present application, please refer toFigures 1 to 4 The cover 2 further comprises a first body portion 22 connected with the cover portion 21 and arranged orthogonally, the shell 1 further comprises a second body portion 12 arranged in parallel with the first body portion 22, and a surrounding portion 13 arranged between the first body portion 22 and the second body portion 12 and surrounding to define a receiving space, the opening 10 is arranged on the surrounding portion 13, and the extending portion 11 is connected to the second body portion 12, the second body portion 12, the surrounding portion 13 and the extending portion 11 are integrally formed.

[0040] Specifically, the cover 2 comprises the first body portion 22 and the cover portion 21, the shell 1 comprises the second body portion 12, the surrounding portion 13 and the extending portion 11, the opening 10 is arranged on the surrounding portion 13, and the extending portion 11 extends outward from one side of the second body portion 12. The surrounding portion 13 surrounds to define a receiving space, the first body portion 22 and the second body portion 12 are arranged on two sides of the surrounding portion 13 respectively to cover the receiving space, and the cover portion 21 is arranged at the opening 10. The circuit board 6 and the second body portion 12 are arranged in parallel, and the circuit board 6 is partially arranged on the second body portion 12 and partially arranged on the extending portion 11 through the communication hole 211 of the cover portion 21, so that the circuit board 6 is stably fixed and connected to the shell 1.

[0041] In some specific embodiments, referring to Figures 1 to 5 The circuit board 6 can mainly be in an "E" shape, and the inner pads 61 are arranged at intervals in the second direction on the circuit board 6, and the connecting portions 62 on the same side of the inner pads 61 connect the inner pads 61 arranged at intervals; the connecting portions 62 of the circuit board 6 are connected to the inner pads 61 and extend to the outside of the receiving space through the communication hole 211 of the cover portion 21, and one end of the connecting portion 62 extending out of the receiving space can be further connected with an outer pad 63 for electrical connection with an external circuit structure.

[0042] In the related art, for a linear motor, the circuit board 6 and the coil 31 are usually fixed on the cover 2, the mass block 53 and the magnetic steel are connected to the shell 1 through the elastic member 4, and then the cover 2 and the shell 1 are assembled and connected. However, the linear motor thus arranged needs to comprehensively consider the spatial layout of the shell 1 and the cover 2 in the actual process, that is, not only to ensure that the layout on the shell 1 alone and the layout on the cover 2 alone are reasonable, but also to consider that after the cover 2 and the shell 1 are assembled, there will be no interference between the parts, and at the same time, the compactness of the overall structure is ensured, which increases the difficulty of spatial layout, and at the same time, it is easy to cause low assembly precision and low assembly yield, which seriously affects the yield of the linear motor, and even if the finished product, it is easy to have performance problems in use. Therefore, the assembly of the parts of the linear motor affects the finished product and performance of the linear motor, which is a great test for those skilled in the art.

[0043] In the embodiment of the present application, the mass 53 is fixed to the housing 1 by the elastic member 4, and the mass 53 is located on the side of the circuit board 6 away from the housing 1.

[0044] Specifically, the mass 53, the first magnetic structure 51, the circuit board 6 and the coil assembly 3 are all arranged in the housing 1. Among them, the first magnetic structure 51 is arranged in the mounting cavity 532 of the mass 53, the coil assembly 3 is also arranged in the mounting cavity 532 and arranged in the first magnetic gap 511 of the first magnetic structure 51, and the solder pad 61 can be arranged in the avoiding groove 531, and the lead of the coil assembly 3 can be directly connected to the solder pad 61, so that the overall structure can be more compact. In addition, since the mass 53, the first magnetic structure 51, the circuit board 6 and the coil assembly 3 are all arranged in the housing 1, they can be uniformly based on the housing 1, which is beneficial to the spatial layout of the housing 1. In addition, the cover 2 is mainly used to cover the housing 1, and after the parts are assembled in the housing 1, the cover 2 can be directly covered, without worrying that the assembly of the cover 2 will affect the use of the parts, so that the assembly precision and assembly yield can be improved.

[0045] In the embodiment of the present application, one end of the elastic member 4 is connected to the housing 1 and the other end is fixedly connected to the mass 53. The mass 53 can be elastically connected to the housing 1 by the elastic member 4. In addition, the mass 53 and the first magnetic structure 51 are fixedly connected, so that the elastic member 4 can provide elastic force for the first magnetic structure 51 through the mass 53, so that the mover 5 can be elastically connected to the housing 1 by the elastic member 4, and the vibration of the mover 5 on the housing 1 can be realized.

[0046] For example, the elastic member 4 can be an elastic sheet. In some specific embodiments, the elastic sheet can be U-shaped, the mouth of the U-shaped elastic sheet faces the mass 53, one end of the U-shaped elastic sheet is fixedly connected to the housing 1 and the other end is fixedly connected to the mass 53, so that the elastic connection between the mass 53 and the housing 1 can be realized by the elastic sheet, and finally the vibration of the mover 5 on the housing 1 can be realized.

[0047] In the embodiment of the present application, the linear motor further comprises a damping member 7, which is arranged between the mass 53 and the elastic member 4. The elastic damping can be provided by the damping member 7, and the vibration response speed of the mover 5 can be improved.

[0048] In some specific embodiments, both ends of the elastic member 4 are fixedly connected to the housing 1 and the mass 53 respectively, and the middle part of the elastic member 4 is used to connect the damping member 7. The damping member 7 is provided with a limiting groove, and the middle part of the elastic member 4 can be located in the limiting groove, so that the assembly connection of the damping member 7 and the elastic member 4 can be realized.

[0049] In some specific embodiments, the damping member 7 protrudes a protrusion 71 towards one side of the mass block 53, the mass block 53 is provided with an embedding groove 524, and the protrusion 71 is located in the embedding groove 524, so that the assembly connection of the damping member 7 and the mass block 53 can be realized.

[0050] In the embodiment of the present application, the linear motor is further provided with a baffle 8 fixedly connected to the cover 2, the mass block 53 is provided with a recessed accommodation groove 533 recessed from the top surface 535 to the bottom surface 536, the accommodation groove 533 is communicated with the mounting cavity 532 to avoid the baffle 8, and the sidewall of the accommodation groove 533 abuts against the baffle 8 to limit the moving stroke of the mass block 53 during the movement of the linear motor. Specifically, after the assembly connection of the cover 2 and the shell 1, the baffle 8 is located in the accommodation groove 533 of the mass block 53, and by arranging the baffle 8, the amplitude of the mass block 53 can be limited, so as to avoid the mass block 53 from colliding with the shell 1, the elastic member 4 and other components during the vibration.

[0051] In some specific embodiments, the middle part of the mass block 53 is provided with a mounting cavity 532, and the first magnetic structure 51 and the coil assembly 3 are arranged in the mounting cavity 532. In addition, the mass block 53 is provided with an avoidance groove 531 communicated with the mounting cavity 532 on the side facing the circuit board 6, and the avoidance groove 531 is arranged at both ends of the coil assembly 3 along the second direction, the pads 61 and the avoidance grooves 531 are one-to-one corresponding, and the pads of the circuit board 6 are located in the avoidance grooves 531 to protect the lead wires of the coil assembly 3. Furthermore, the mass block 53 is provided with an accommodation groove 533 communicated with the mounting cavity 532 on the side away from the circuit board 6, and the baffle 8 is located in the accommodation groove 533 after the assembly connection of the cover 2 and the shell 1. In this way, the compactness of the overall structure can be realized.

[0052] In some specific embodiments, the cover 2 comprises a first main body part 22 and a covering part 21, and the baffle 8 is fixedly connected to the first main body part 22, so that the baffle 8 is located in the accommodation groove 533 after the assembly connection of the cover 2 and the shell 1, and the baffle 8 can limit the amplitude of the mass block 53.

[0053] In some specific embodiments, the linear motor comprises two baffles 8 respectively located at both ends of the coil assembly 3 along the second direction, and the mass block 53 is provided with an accommodation groove 533 corresponding to the baffle 8 on the side facing the first main body part 22, and the baffle 8 is located in the accommodation groove 533, so that the baffle 8 can limit the amplitude of the mass block 53.

[0054] In the embodiment of the present application, the coil assembly 3 comprises a coil 31 and a skeleton 32, the skeleton 32 is fixedly connected to the shell 1, and the coil 31 is arranged around the skeleton 32.

[0055] Specifically, the skeleton 32 can provide mechanical support for the coil 31, and the coil 31 can be fixedly connected to the shell 1 through the skeleton 32, facilitating installation and fixation of the coil 31.

[0056] In some specific embodiments, the coil 31 can have lead wires respectively led out in the second direction of the coil assembly 3, the lead wires and the pads 61 of the circuit board 6 are in one-to-one correspondence, and the electrical connection between the coil 31 and the circuit board 6 is realized through the connection between the lead wires and the pads 61.

[0057] In the embodiments of the present application, please refer to Figures 1 to 5 , the skeleton 32 includes a main structure 321 and a connecting structure 322 connected to both sides of the main structure 321 along the second direction, the coil 31 is arranged around the main structure 321, and the connecting structure 322 is connected to the shell 1; the connecting structure 322 is provided with a notch 3221 penetrating in the second direction for the lead wires of the coil 31 to pass through, so that the lead wires of the coil 31 are connected to the corresponding inner pads 61, realizing the electrical connection between the coil assembly 3 and the circuit board 6.

[0058] In some specific embodiments, the coil 31 is arranged around the main structure 321, so that the coil 31 can be stably assembled on the skeleton 32; there are two connecting structures 322 respectively connected to both sides of the main structure 321, and the connecting structure 322 on the side of the main structure 321 facing the shell 1 in the third direction can be fixedly connected to the shell 1 by adhesion or the like. In addition, one of the connecting structures 322 is located between the main structure 321 and one of the inner pads 61, and the other connecting structure 322 is located between the main structure 321 and the other inner pad 61; and the connecting structure 322 is provided with a penetrating notch 3221 in the second direction, in the present embodiment, the notch 3221 is provided on the bottom wall of the connecting structure 322 connected to the shell 1, so that the two lead wires of the coil 31 arranged on the main structure 321 can be respectively led out through the notches 3221 on both sides to be connected to the corresponding inner pads 61, realizing the electrical connection between the coil assembly 3 and the circuit board 6.

[0059] For example, the main structure 321 and the connecting structure 322 can be integrally formed.

[0060] In the embodiment of the present application, the coil assembly 3 has a long axis side and a short axis side, and the inner pads 61 are located on both sides of the long axis side of the coil assembly 3. Specifically, the coil assembly 3 can be a solenoid, including a long axis side and a short axis side, wherein the short axis side can be parallel to the first direction, and the long axis side can be parallel to the second direction, so that the inner pads 61 are located on both sides of the long axis side of the coil assembly 3, and the first magnetic structure 51 is arranged on both sides of the short axis side of the coil assembly 3, so that the inner pads 61 and the first magnetic structure 51 can be arranged in different directions of the coil assembly 3, and the first magnetic structure 51 does not need to provide a space for the inner pads 61, so that the embodiment of the present application can increase the height of the first magnetic structure 51, can improve the driving force of the linear motor, and enhance the vibration feeling of the linear motor.

[0061] Please refer to FIG. 6, in other embodiments of the present application, the difference from the above-mentioned embodiment is that the mover 5 further includes a second magnetic structure 52 fixed in the mounting cavity 532 and located on both sides of the coil assembly 3 along the second direction; and the two inner pads 61 are located in the second magnetic gap 521 of the second magnetic structure 52. By arranging the second magnetic structure 52, the vibration feeling can be further improved. In addition, the second magnetic structure 52 is arranged on both sides of the coil assembly 3 along the second direction, and there is a gap between the second magnetic structure 52 and the coil assembly, so that the inner pads 61 can be arranged in the gap, so that the lead of the coil assembly 3 can be directly connected to the inner pads 61, so that the second magnetic structure 52 also does not need to reserve space for the inner pads 61 along the third direction, and the driving force can be improved.

[0062] In some specific embodiments, the mounting cavity 532 of the mass block 53 can include a first cavity in a square shape, and a second cavity recessed away from the coil assembly 3 along the second direction, the coil assembly 3 is arranged in the middle of the first cavity, the first cavity is provided with the first magnetic structure 51 on both sides along the first direction, the first cavity is provided with the two inner pads 61 on both sides along the second direction, and the second cavity is provided with the second magnetic structure 52.

[0063] The above-mentioned is only the embodiment of the present application, and it should be pointed out that for those skilled in the art, without departing from the concept of the present application, improvements can be made, but these all belong to the protection scope of the present application.

Claims

1. A linear motor, comprising a housing, a cover connected to the housing to form a receiving space, a mover housed within the receiving space, a stator for driving the mover to vibrate, and an elastic member suspending the mover within the receiving space, the mover comprising a mass block having a mounting cavity and a first magnetic structure fixed within the mounting cavity, the stator comprising a coil assembly fixed to the housing and housed within the mounting cavity and a circuit board electrically connected to the coil assembly, the first magnetic structure being located on both sides of the coil assembly along a first direction; characterized in that, The circuit board includes inner pads located on both sides of the coil assembly along a second direction and a connecting portion connecting the inner pads. The inner pads are located in a first magnetic gap of the first magnetic structure. The connecting portion at least partially coincides with the projection of the first magnetic structure along a third direction. The first direction, the second direction, and the third direction are orthogonal to each other, and the second direction is parallel to the vibration direction of the mover. The mass block includes a bottom surface facing the circuit board along the third direction and a top surface corresponding to the bottom surface. The mass block is provided with a relief groove recessed from the bottom surface to the top surface. The relief groove communicates with the mounting cavity to avoid the inner pads.

2. The linear motor according to claim 1, characterized in that, The mover also includes a second magnetic structure fixed within the mounting cavity and located on both sides of the coil assembly along the second direction; the inner pad is located in the second magnetic gap of the second magnetic structure.

3. The linear motor according to claim 1, characterized in that, The circuit board is fixedly connected to the housing. The housing has an opening on one side along the second direction. The cover includes a covering portion that extends along the third direction and covers the opening. The covering portion has a connecting hole that connects the outside to the receiving space. The circuit board extends to the outside of the receiving space through the connecting hole.

4. The linear motor according to claim 3, characterized in that, The housing includes an extension protruding outside the receiving space on one side along the second direction, and the circuit board also includes an outer pad connected to the side of the connection portion away from the inner pad along the second direction and for connection to an external circuit. The outer pad is located outside the receiving space and fixed to the extension.

5. The linear motor according to claim 4, characterized in that, The cover also includes a first main body portion connected to and orthogonally arranged with the covering portion. The housing also includes a second main body portion arranged parallel to the first main body portion, and an enclosure portion located between the first main body portion and the second main body portion and defining the receiving space. The opening is provided in the enclosure portion, and the extension portion is connected to the second main body portion. The second main body portion, the enclosure portion and the extension portion are integrally formed.

6. The linear motor according to claim 3, characterized in that, The mass block is fixed to the housing by the elastic element, and the mass block is located on the side of the circuit board away from the housing.

7. The linear motor according to claim 1, characterized in that, The linear motor is also provided with a baffle plate, which is fixedly connected to the cover. The mass block is provided with a relief groove that is recessed from the top surface to the bottom surface. The relief groove communicates with the mounting cavity to avoid the baffle plate. During the movement of the linear motor, the side wall of the relief groove abuts against the baffle plate to limit the movement stroke of the mass block.

8. The linear motor according to claim 1, characterized in that, The coil assembly includes a coil and a frame, the frame being fixedly connected to the housing, and the coil being wound around the frame.

9. The linear motor according to claim 8, characterized in that, The skeleton includes a main structure and a connecting structure connected to both sides of the main structure along a second direction. The coil is wound around the main structure, and the connecting structure is connected to the housing. The connecting structure is provided with a notch that passes through along the second direction for the lead wire of the coil to pass through.

10. The linear motor according to claim 1, characterized in that, The coil assembly has a long axis and a short axis, and the inner pads are located on both sides of the long axis of the coil assembly.

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