Linear electric motor

Abstract

A linear electric motor (100), comprising a housing (1), and a vibrator assembly (2) and elastic holders (3), which are accommodated in the housing (1). The elastic holders (3) are respectively disposed on two sides of the vibrator assembly (2) in a direction of vibration. Each elastic holder comprises a first fixing portion (31) connected to the housing (1), a second fixing portion (32) connected to the vibrator assembly (2), and a middle connecting portion (33). A solder piece (5) is provided on the outer surface of the second fixing portion (32), and comprises two first side edges (51) which are arranged in parallel to each other and extend in the direction of vibration, and a second side edge (52) and a circular-arc edge (53), which connect the two first side edges (51), wherein the circular-arc edge (53) is closer to the connecting portion (33) than the second side edge (52), and the circular-arc edge (53) protrudes in a direction away from the second side edge (52). In the linear electric motor (100), an edge of the solder piece (5) is of a circular-arc structure, so that the stress distribution of spring holders can be improved, thereby prolonging the service life of a product.

Description

Linear motor Technical Field

[0001] The utility model relates to a linear motor, in particular to a linear motor used in the field of mobile electronic products. Background Art

[0002] With the advancement of electronic technology, the demand for mobile electronic products is increasing. These products often use linear motors for system vibration feedback, such as incoming call notifications, message notifications, and vibration feedback for games. Such a wide range of applications requires vibration motors with excellent performance and long service life.

[0003] A conventional linear motor consists of a housing, a vibrator housed within the housing, a stator, and an elastic support. The vibrator includes a mass and a magnetic circuit system. The elastic support and mass are secured to each other by welding tabs to support the reciprocating motion of the vibrator. However, the welding tabs in conventional technology are typically rectangular or chamfered, which can cause stress concentration at several vertices of the elastic support welded to them, easily leading to fatigue and rapid wear of the elastic support.

[0004] Therefore, it is necessary to provide a new linear motor to solve the above technical problems. Technical issues

[0005] In view of the above problems, the present invention proposes a linear motor capable of improving the stress distribution of the elastic bracket and increasing the product life. Technical Solutions

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A linear motor includes a housing with a receiving space, a vibrator assembly received in the housing, and a pair of elastic supports fixed to the housing and arranged on both sides of the vibration direction of the vibrator assembly, the elastic supports including a first fixing portion connected to the housing, a second fixing portion connected to the vibrator assembly, and a connecting portion connecting the first fixing portion and the second fixing portion; a welding piece is provided on the outer surface of the second fixing portion, the welding piece including two first side edges arranged relatively parallel and extending along the vibration direction, a second side edge and an arc edge connecting the two first side edges, the arc edge being closer to the connecting portion than the second side edge, and the arc edge protruding in a direction away from the second side edge.

[0008] Preferably, the second side is perpendicular to the vibration direction.

[0009] Preferably, the arc edge is symmetrical along the central axis of the second side.

[0010] Preferably, the first side edge and the second side edge are flush with an edge of the second fixing portion.

[0011] Preferably, the vibrator assembly includes a mass block having a mounting cavity and a magnetic circuit structure disposed in the mounting cavity, the mass block is provided with a fixing protrusion fixed to the second fixing portion, and the shape of the fixing protrusion is consistent with the shape of the welding piece.

[0012] Preferably, a foam damper is provided between the connecting portion and the mass block.

[0013] Preferably, the housing comprises an upper cover and a lower cover which are arranged opposite to each other, and a stator assembly for driving the vibrator assembly to vibrate and a limit block for limiting the movement of the vibrator assembly along the vibration direction are fixed on the lower cover. Beneficial effects

[0014] The beneficial effects of this utility model are:

[0015] The welding piece for fixing the elastic support to the vibrator assembly in the linear motor includes two first side edges arranged relatively parallel and extending along the vibration direction, and a second side edge and an arc edge connecting the two first side edges. The arc edge is closer to the connection portion of the elastic support than the second side edge, and the arc edge protrudes in a direction away from the second side edge. The provision of the arc edge can improve the stress distribution of the elastic support, reduce the loss of the elastic support, and increase the service life of the elastic support. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art in the field of the present invention, other drawings can be obtained based on these drawings without creative work. Among them:

[0017] FIG1 is a perspective view of a linear motor provided by the present invention;

[0018] FIG2 is a cross-sectional view along line AA in FIG1 ;

[0019] FIG3 is a perspective exploded view of the linear motor provided by the present invention;

[0020] FIG4 is a perspective view of the elastic bracket and welding piece of the linear motor provided by the present invention;

[0021] FIG5 is a three-dimensional view of the linear motor provided by the present invention with the upper cover removed.

[0022] In the picture:

[0023] 100. Linear motor; 1. Housing; 11. Upper cover; 12. Lower cover; 13. Accommodation space; 2. Vibrator assembly; 21. Mass block; 211. Mounting cavity; 212. Fixing protrusion; 22. Magnetic circuit structure; 221. Magnet; 222. Magnetic plate; 3. Elastic bracket; 31. First fixing part; 32. Second fixing part; 33. Connecting part; 4. Stator assembly; 41. Coil; 42. Iron core; 43. Flexible circuit board; 5. Soldering piece; 51. First side edge; 52. Second side edge; 53. Arc edge; 6. Foam damping; 7. Limit block; X, vibration direction. Modes for Carrying Out the Invention

[0024] The technical solution of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] As shown in Figures 1 to 5, the present invention provides a linear motor 100, which includes a housing 1 having a receiving space 13, a vibrator assembly 2 accommodated in the housing 1, a pair of elastic brackets 3 fixed to the housing 1 and arranged symmetrically on both sides of the vibration direction X of the vibrator assembly 2, and a stator assembly 4 fixed to the housing 1 for driving the vibrator assembly 2 to vibrate.

[0026] The housing 1 includes an upper cover 11 and a lower cover 12 that are oppositely arranged, and the stator assembly 4 is fixed on the lower cover 12 .

[0027] The vibrator assembly 2 includes a mass block 21 having a mounting cavity 211 and a magnetic circuit structure 22 placed in the mounting cavity 211. The magnetic circuit structure 22 includes a magnetic conductive plate 222 fixed on the mass block 21 and a magnetic steel 221 fixed on the magnetic conductive plate 222. The magnetic conductive plate 222 is used to converge the magnetic lines of force of the magnetic steel 221, thereby improving the magnetic field performance of the linear motor 100.

[0028] The elastic bracket 3 includes a first fixing portion 31 connected to the housing 1 , a second fixing portion 32 connected to the mass block 21 , and a connecting portion 33 connecting the first fixing portion 31 and the second fixing portion 32 . A welding piece 5 is provided on an outer surface of the second fixing portion 33 .

[0029] The stator assembly 4 includes an iron core 42 arranged corresponding to the magnetic steel 221, a coil 41 wound around the iron core 42, and a flexible circuit board 43 fixed to the lower cover 12 and electrically connected to the coil 41. When the coil 41 is energized, it interacts with the magnetic steel 221, so that the elastic bracket 3 drives the mass block 21 to reciprocate along the vibration direction X, thereby providing a vibration sense.

[0030] As shown in Figure 4, the welding piece 5 includes two first side edges 51 arranged relatively parallel and extending along the vibration direction X, and a second side edge 52 and an arc edge 53 connecting the two first side edges 51. The arc edge 53 is closer to the connecting portion 33 than the second side edge 52, and the arc edge 53 protrudes in the direction away from the second side edge 52. The second side edge 52 is perpendicular to the vibration direction X. The arc edge 53 is symmetrical along the central axis of the second side edge 52, and the first side edge 51 and the second side edge 52 are flush with the edge of the second fixing portion 32.

[0031] Furthermore, as shown in Figure 3, the mass block 21 is provided with a fixing protrusion 211 fixed to the second fixing portion 32. The shape of the fixing protrusion 211 is consistent with the shape of the welding piece 5 to ensure that the second fixing portion 33 of the elastic bracket 3 is evenly stressed when fixed to the mass block 21.

[0032] Furthermore, as shown in FIG2 , in order to prevent the connection portion 33 of the elastic bracket 3 from colliding with the mass block 21 during vibration to generate noise and to improve the vibration damping of the vibrator assembly 2 , a foam damper 6 is provided between the connection portion 33 and the mass block 21 .

[0033] Furthermore, as shown in FIG. 2-FIG . 3 , a limit block 7 for limiting the movement of the vibrator assembly 2 along the vibration direction X is fixed on the lower cover 12 of the housing.

[0034] Compared with the related art, the welding piece of the linear motor provided by the present invention is changed from a rectangular or chamfered structure to an arc structure, thereby improving the stress distribution of the elastic bracket, reducing the loss of the elastic bracket, and increasing the service life of the elastic bracket.

[0035] The above is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements are all within the scope of protection of the present invention.

Claims

1. A linear motor, comprising a housing having a receiving space, a vibrator assembly received in the housing, and a pair of elastic brackets fixed to the housing and arranged on both sides of the vibration direction of the vibrator assembly, characterized in that: The elastic bracket includes a first fixing portion connected to the housing, a second fixing portion connected to the vibrator assembly, and a connecting portion connecting the first fixing portion and the second fixing portion; a welding piece is provided on the outer surface of the second fixing portion, and the welding piece includes two first side edges which are relatively parallel and extend along the vibration direction, and a second side edge and an arc edge connecting the two first side edges, wherein the arc edge is closer to the connecting portion than the second side edge and the arc edge protrudes in a direction away from the second side edge.

2. The linear motor according to claim 1, characterized in that: The second side is perpendicular to the vibration direction.

3. The linear motor according to claim 2, characterized in that: The arc edge is symmetrical along the central axis of the second side.

4. The linear motor according to claim 1, characterized in that: The first side edge and the second side edge are flush with an edge of the second fixing portion.

5. The linear motor according to claim 1, characterized in that: The vibrator assembly includes a mass block having a mounting cavity and a magnetic circuit structure disposed in the mounting cavity. The mass block is provided with a fixing protrusion fixed to the second fixing portion, and the shape of the fixing protrusion is consistent with the shape of the welding piece.

6. The linear motor according to claim 5, characterized in that: A foam damper is arranged between the connecting portion and the mass block.

7. The linear motor according to claim 1, characterized in that: The housing comprises an upper cover and a lower cover which are arranged opposite to each other. A stator assembly for driving the vibrator assembly to vibrate and a limit block for limiting the movement of the vibrator assembly along the vibration direction are fixed on the lower cover.

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