Linear motor

Abstract

The utility model discloses a linear motor, which comprises a shell, a vibrator assembly and a stator assembly, the vibrator assembly comprises a mass block and a magnetic circuit assembly fixed with the mass block, the magnetic circuit assembly comprises at least two side magnets and at least two center magnets which are different in thickness and are positioned between the two adjacent side magnets, the side magnets and the center magnets are arranged in the first direction and the second direction respectively, the magnetizing directions of the two center magnets are opposite and parallel to the first direction, and the magnetizing directions of the two adjacent side magnets are opposite and parallel to the second direction. The stator assembly comprises a coil and a conductive damping piece, the coil and the conductive damping piece are distributed on the two sides of the magnetic circuit assembly and fixed to the shell, and the two driving edges of the coil correspond to the two adjacent edge magnets respectively. The magnetic field intensity of the coil side and the conductive damping piece side is increased, it is guaranteed that the stator assembly side has strong electromagnetic driving force, sufficient electromagnetic damping is provided for the conductive damping piece side, the descending time of the motor is effectively shortened, and the user experience feeling is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a linear motor. Background Art

[0002] At present, due to the good stability of electromagnetic damping under high temperature and high humidity, linear motors with electromagnetic damping are widely used in devices such as mobile phones and handles. At the same time, with the improvement of motor performance, the demand for motor damping is also increasing. When the set volume of the motor is small, its damping force is small, resulting in a relatively long descent time of the motor, which affects the user experience. Content of the Utility Model

[0003] Aiming at the defects in the prior art, the utility model provides a linear motor, which can provide sufficient electromagnetic damping for the motor while meeting the driving force, so as to achieve the purpose of shortening the descent time and improving the user experience.

[0004] The technical solution provided by the utility model is: a linear motor, including a housing, a vibrator assembly and a stator assembly. The vibrator assembly and the stator assembly are located in the housing. The vibrator assembly includes a mass block and a magnetic circuit assembly fixed to the mass block. The magnetic circuit assembly includes at least two side magnets and at least two center magnets. At least two of the side magnets are arranged at intervals along a first direction. Two center magnets are clamped between two adjacent side magnets. The two center magnets are arranged along a second direction. The magnetization directions of the two center magnets are opposite and parallel to the first direction. The magnetization directions of two adjacent side magnets are opposite and parallel to the second direction. Any one of the two center magnets and the two adjacent side magnets form a Halbach magnetic circuit. The thicknesses of the two center magnets along the second direction are different.

[0005] The stator assembly includes a coil and a conductive damping member. Along the second direction, the coil and the conductive damping member are respectively located on both sides of the magnetic circuit assembly and fixed to the housing. The two driving edges of the coil respectively correspond to two adjacent side magnets.

[0006] The first direction is the displacement direction of the vibrator assembly, and the second direction is perpendicular to the first direction.

[0007] As an improvement, the magnetic circuit assembly includes two side magnets and two center magnets.

[0008] As an improvement, the two center magnets clamped between two adjacent side magnets include a first center magnet and a second center magnet. The first center magnet is located between the second center magnet and the conductive damping member. Along the second direction, the thickness of the first center magnet is less than that of the second center magnet.

[0009] As a further improvement, the mass block has a through hole arranged along the second direction, and the magnetic circuit assembly is embedded in the through hole.

[0010] As a further improvement, a crossbeam arranged transversely is provided in the through hole on the mass block, the two side magnets are distributed on both sides of the crossbeam along the first direction, and the two center magnets are distributed on both sides of the crossbeam along the second direction.

[0011] As a further improvement, the crossbeam and the mass block are integrally formed.

[0012] As a further improvement, the conductive damping member is a copper sheet.

[0013] As a further improvement, the magnetic circuit assembly is attached to the side wall of the through hole, and the two center magnets are attached or spaced apart.

[0014] As a further improvement, along the second direction, at least one side of the mass block is provided with an avoidance groove, and at least one of the conductive damping member and the coil corresponds to the avoidance groove.

[0015] As an improvement, avoidance notches are provided at the corner positions of the conductive damping member.

[0016] Adopting the above technical solutions, the beneficial effects of a linear motor provided by the present utility model are as follows:

[0017] Under the action of the electromagnetic force generated on the stator assembly side, the magnetic circuit assembly drives the mass block to reciprocate synchronously. At the same time, the magnetic induction lines penetrating the copper sheet change alternately and generate a large electromagnetic damping, that is: the magnetic field strength on the stator assembly side and the copper sheet side is increased, which not only ensures a strong electromagnetic driving force on the stator assembly side, but also provides sufficient electromagnetic damping for the copper sheet side, effectively shortening the falling time of the motor and improving the user experience, providing a guarantee for the small size of the motor and good product characteristics. Description of the Drawings

[0018] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 It is a cross-sectional view of the linear motor provided by the present utility model;

[0020] Figure 2Is an isometric view of the linear motor provided by the present utility model (excluding the upper shell);

[0021] Figure 3 Is Figure 2 Isometric view after removing the copper sheet;

[0022] Figure 4 Is an exploded view of the defined motor provided by the present utility model;

[0023] In the figure, 1 - housing; 2 - mass block; 201 - through hole; 202 - cross beam; 203 - avoidance groove; 3 - shrapnel assembly; 4 - magnetic circuit assembly; 401 - first side magnet; 402 - second side magnet; 403 - first center magnet; 404 - second center magnet; 5 - stator assembly; 501 - FPCB; 502 - coil; 6 - copper sheet; 601 - avoidance notch. Detailed implementation mode

[0024] Next, embodiments of the technical solution of the present utility model will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present utility model, so they are only examples and cannot be used to limit the protection scope of the present utility model.

[0025] As Figures 1 to 4 Collectively shown, a linear motor includes a housing 1. An oscillator assembly and a stator assembly are provided inside the housing 1. The oscillator assembly includes a mass block 2 and a magnetic circuit assembly 4 fixed to the mass block 2 (the magnetic circuit assembly 4 can be embedded in the mass block 2, directly bonded and fixed, or snap-fitted and fixed, etc.). The magnetic circuit assembly 4 includes at least two side magnets and at least two center magnets. The at least two side magnets are arranged at intervals along a first direction. Two center magnets are clamped between two adjacent side magnets. The two center magnets are arranged along a second direction. The magnetization directions of the two center magnets are opposite and parallel to the first direction. The magnetization directions of two adjacent side magnets are opposite and parallel to the second direction (for the magnetization directions, refer to Figure 1 The directions of the solid arrow and the dashed arrow in the figure, where the dashed arrow represents one magnetization direction and the solid arrow represents one magnetization direction). Any one of the two center magnets and the two adjacent side magnets together form a Halbach magnetic circuit. The thicknesses of the two center magnets are different along the second direction; the first direction is the displacement direction of the oscillator assembly, and the second direction is perpendicular to the first direction.

[0026] The stator assembly 5 includes an FPCB 501, a coil 502, and a conductive damping member. The conductive damping member is a copper sheet 6 in this solution. Along the second direction, the coil 502 and the conductive damping member are respectively located on both sides of the magnetic circuit assembly 4 and are adhesively fixed to the housing 1. The two driving sides of the coil 502 respectively correspond to two adjacent side magnets.

[0027] Any one of the two central magnets and the two adjacent side magnets form a Halbach magnetic circuit, which can not only increase the magnetic field strength on the side of the coil 502 to enhance the driving force, but also increase the magnetic field strength on the side of the conductive damping member to enhance the electromagnetic damping effect.

[0028] In one embodiment, the housing 1 includes an upper shell and a lower shell. The upper shell and the lower shell enclose a receiving cavity for accommodating the oscillator assembly and the stator assembly. The conductive damping member is fixed to the upper shell, and the upper shell is made of a magnetic conductive material. The coil 502 is fixed to the lower shell, and the lower shell can be made of a magnetic conductive material or a non-magnetic conductive material.

[0029] In one embodiment, the magnetic circuit assembly 4 includes two side magnets and two central magnets. The central magnets include a first central magnet 403 and a second central magnet 404; the side magnets include a first side magnet 401 and a second side magnet 402.

[0030] In one embodiment, the two central magnets sandwiched by two adjacent side magnets include a first central magnet 403 and a second central magnet 404. The first central magnet 403 is located between the second central magnet 404 and the conductive damping member. Along the second direction, the thickness of the first central magnet 403 is less than the thickness of the second central magnet 404. Of course, it can also be set that the thickness of the first central magnet 403 is greater than the thickness of the second central magnet 404.

[0031] In one embodiment, a through hole 201 is formed in the mass block 2 along the second direction and is located at the central position of the mass block 2. The magnetic circuit assembly is embedded in the through hole 201; the magnetic circuit assembly 4 is adhesively attached to the side wall of the through hole 201. The two central magnets are arranged in contact or spaced apart. The present invention does not limit the magnetism.

[0032] In one embodiment, a cross beam 202 is provided in the through hole 201 of the mass block 2 and runs through it. The two side magnets are distributed on both sides of the cross beam 202 along the first direction, and the two central magnets are distributed on both sides of the cross beam 202 along the second direction (the first side magnet 401, the second side magnet 402, the first central magnet 403 and the second central magnet 404 are distributed around the cross beam 202); the cross beam 202 is integrally formed with the mass block 2, so as to ensure the mass of the mass block 2 through the cross beam 202 to ensure the vibration effect of the motor; at the same time, it is convenient for the assembly of the magnetic circuit assembly 4. The tops of the first side magnet 401 and the second side magnet 402 are flush with the top surface of the mass block 2, and the bottoms of the first side magnet 401 and the second side magnet 402 are flush with the bottom surface of the mass block 2; the top surface of the first central magnet 403 does not protrude from the top surface of the mass block 2 and can be flush, and the bottom surface of the second central magnet 404 does not protrude from the bottom surface of the mass block 2 and can be flush.

[0033] In one embodiment, along the second direction, at least one side of the mass block 2 is provided with an avoidance groove 203, and at least one of the copper sheet 6 and the coil 502 is arranged corresponding to the avoidance groove 203; the copper sheet 6 extends towards the mass block 2 and extends into the avoidance groove 203, and an avoidance notch 601 is provided at the corner position of the copper sheet 6. Thus, through the above structure, it not only helps the design of the motor to be miniaturized, but also avoids the problem of mutual interference during operation.

[0034] In one embodiment, the conductive damping member is the copper sheet 6, which has good electrical conductivity.

[0035] Elastic sheet assemblies 3 are provided between the outer walls on both sides of the mass block 2 and the inner walls of the corresponding housing 1. The elastic sheet assemblies 3 include an elastic sheet body, the elastic sheet body is bent and has a V-shaped structure, the bent part of the elastic sheet body is arc-shaped, and the open ends of the elastic sheet body are respectively fixedly connected (such as welded) to the outer wall of the mass block 2 and the inner wall of the housing 1; the open ends of the two elastic sheet assemblies 3 located on both sides of the mass block 2 are arranged in opposite directions. Thus, through the two elastic sheet assemblies 3 with this structure, the forces generated during operation are distributed more reasonably and evenly.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A linear motor, comprising a housing, a vibrator assembly and a stator assembly, wherein the vibrator assembly and the stator assembly are located within the housing, characterized in that, The oscillator assembly includes a mass block and a magnetic circuit assembly fixed to the mass block. The magnetic circuit assembly includes at least two side magnets and at least two center magnets. At least two of the side magnets are arranged at intervals in a first direction. Two center magnets are clamped between two adjacent side magnets. The two center magnets are arranged in a second direction. The magnetization directions of the two center magnets are opposite and parallel to the first direction. The magnetization directions of two adjacent side magnets are opposite and parallel to the second direction. Any one of the two center magnets and the two adjacent side magnets form a Halbach magnetic circuit. The thicknesses of the two center magnets in the second direction are different; The stator assembly includes a coil and a damping resistor. Along the second direction, the coil and the damping resistor are respectively located on both sides of the magnetic circuit assembly and fixed to the housing. The two driving edges of the coil respectively correspond to two adjacent side magnets; The first direction is the displacement direction of the oscillator assembly, and the second direction is perpendicular to the first direction.

2. The linear motor according to claim 1, wherein The magnetic circuit assembly includes two side magnets and two center magnets.

3. The linear motor according to claim 1, wherein The two center magnets clamped between two adjacent side magnets include a first center magnet and a second center magnet. The first center magnet is located between the second center magnet and the damping resistor. Along the second direction, the thickness of the first center magnet is less than that of the second center magnet.

4. The linear motor according to any one of claims 1 to 3, characterized in that, The mass block has a through hole arranged in the second direction, and the magnetic circuit assembly is embedded in the through hole.

5. The linear motor according to claim 4, wherein A cross beam is arranged across the through hole on the mass block. The two side magnets are distributed on both sides of the cross beam in the first direction, and the two center magnets are distributed on both sides of the cross beam in the second direction.

6. The linear motor according to claim 5, wherein The cross beam and the mass block are integrally formed.

7. The linear motor according to any one of claims 1-3, characterized in that The damping resistor is a copper sheet.

8. The linear motor according to claim 4, characterized in that, The magnetic circuit assembly is in contact with the side wall of the through hole, and the two center magnets are arranged in contact or at intervals.

9. The linear motor according to any one of claims 1-3, characterized in that, Along the second direction, at least one side of the mass block is provided with an avoidance groove, and at least one of the damping resistor and the coil corresponds to the avoidance groove.

10. The linear motor according to claim 1, characterized in that, Avoidance notches are provided at the corner positions of the damping resistor.

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