A miniature linear motor

Abstract

The utility model provides a kind of miniature linear motor, including support, plane spring, support seat;Support is provided with plane spring by support seat, support seat is set at the periphery of plane spring bottom, and placement groove is set in the middle of plane spring, and multiple arc grooves are set around placement groove in plane spring in a staggered manner.The utility model is provided with support, plane spring, support seat, and there is only one thickness of distance in the Z direction space of plane spring, which saves the internal space of linear motor, and further reduces the volume of linear motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a miniature linear motor. Background Technology

[0002] With the advent of the Internet of Things era, everyday items such as rings, glasses, watches, and jewelry are becoming electronic and intelligent. As a key component, micro vibration motors are widely used in tactile feedback, status prompts, and interactive control. Currently, linear motors on the market are mainly used in smartphones and high-end watches. Due to their large size, they cannot be used in applications such as rings and jewelry that require light weight and small size.

[0003] The existing coin-shaped linear vibration motor spring uses a tension spring structure (1mm in height). This structure is bulky, occupies a large amount of internal space of the motor, and compresses the knitting motion distance of the motor. Utility Model Content

[0004] The technical problem to be solved by this invention is how to reduce the size of a linear motor.

[0005] This utility model solves the above-mentioned technical problems through the following technical means:

[0006] A miniature linear motor includes a bracket (1), a planar spring (5), and a support base (6); the planar spring (5) is mounted on the bracket (1) via the support base (6), the support base (6) is located on the periphery of the bottom of the planar spring (5), a placement groove (51) is provided in the middle of the planar spring (5), and multiple arc-shaped grooves (52) are alternately provided on the planar spring (5) around the placement groove (51).

[0007] Beneficial effects: By setting up the bracket, flat spring and support base, the flat spring has only a material thickness distance in the Z direction, which saves the internal space of the linear motor and thus reduces the size of the linear motor.

[0008] Furthermore, it also includes a flexible printed circuit board (3), and a notch (61) is provided on one side of the support base (6). The output end of the flexible printed circuit board (3) passes through the notch (61) and is fixed on the bracket (1).

[0009] Beneficial effect: The notch is designed to allow for the avoidance of flexible printed circuit boards.

[0010] Furthermore, the support base (6) is arranged in a circular shape.

[0011] Furthermore, a coil (4) is fixed at the output end of the flexible printed circuit board (3), and the coil (4) is disposed through the placement slot (51).

[0012] Beneficial effects: By setting up a flexible printed circuit board and coils, the two input pads at the input end of the flexible printed circuit board are connected to a sine wave generator, which loads a periodic sine wave signal onto the motor, and the coil connected to the flexible printed circuit board will generate a periodic magnetic field.

[0013] Furthermore, the coil (4) is provided with an inlet line (41) located inside the coil (4) and an outlet line (42) located outside the coil (4). A second clearance groove (32) is provided on the flexible printed circuit board (3) near the inlet line (41) and a third clearance groove (33) is provided on the flexible printed circuit board (3) near the outlet line (42). The inlet line (41) is led out through the second clearance groove (32) and fixed to the first output pad (34) of the flexible printed circuit board (3). The outlet line (42) is led out through the third clearance groove (33) and fixed to the second output pad (35) of the flexible printed circuit board (3).

[0014] Beneficial effects: The second and third clearance slots ensure that the coil is stably fixed on the flexible printed circuit board.

[0015] Furthermore, a first clearance groove (31) is provided on the flexible printed circuit board (3) near the coil (4), and the coil (4) is fixed on the flexible printed circuit board (3) around the first clearance groove (31).

[0016] Beneficial effect: The first clearance groove is designed to prevent the magnet from colliding with the flexible printed circuit board during movement.

[0017] Furthermore, a magnet (9) is provided inside the coil (4), the top wall of the magnet (9) is fixed on the magnetic guide plate (8), the outer periphery of the magnetic guide plate (8) is fixed on the mass block (7), and the bottom wall of the mass block (7) is fixed on the planar spring (5).

[0018] Beneficial effects: By setting up a coil, magnet, magnetic plate, mass block, and plane spring, the periodic magnetic field generated by the coil and the magnet produce an electromagnetic force that attracts (repels) each other, thereby pushing the mass block to move in the Z direction. Under the action of the plane spring, the mass block can perform periodic simple harmonic motion.

[0019] Furthermore, the mass block (7) is set as a stepped frustum, the diameter of the bottom of the mass block (7) is smaller than the diameter of the top, the mass block (7) is set through the middle, and the top wall of the mass block (7) near the through point is provided with an installation groove (71), a magnetic plate (8) is fixed in the installation groove (71), and a magnet (9) is set at the through point of the mass block (7).

[0020] Furthermore, the thickness of the face spring (5) is 0.04-0.08 mm, and the height of the support base (6) is 0.25-0.5 mm.

[0021] Furthermore, a housing (2) is fixed on the top wall of the bracket (1). The housing (2) is hollow, and a planar spring (5) and a support base (6) are set inside the housing (2). Attached Figure Description

[0022] Figure 1 This is a side sectional view of a miniature linear motor according to Embodiment 1 of this utility model;

[0023] Figure 2 This is an assembly diagram of the bracket, flexible printed circuit board, and coil in a miniature linear motor according to Embodiment 1 of this utility model;

[0024] Figure 3 This is a top view of the planar spring in the micro linear motor of Embodiment 1 of this utility model. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Example 1

[0027] like Figure 1 As shown, this embodiment provides a miniature linear motor, including a bracket 1, a housing 2, a flexible printed circuit board 3, a coil 4, a planar spring 5, a support base 6, a mass block 7, a magnetic plate 8, and a magnet 9.

[0028] like Figure 1 , Figure 2As shown, a housing 2 is fixed to the top wall of the support 1. The housing 2 is hollow, and the support 1 is circular. Both the support 1 and the housing 2 are made of stainless steel. A flexible printed circuit board 3 is fixed to the top wall of the support 1. The input end of the flexible printed circuit board 3 extends out of the housing 2, and a coil 4 is fixed to the output end of the flexible printed circuit board 3. Specifically, a first clearance groove 31 is provided on the flexible printed circuit board 3 near the coil 4. The coil 4 is fixed on the flexible printed circuit board 3 around the first clearance groove 31. The first clearance groove 31 is used to prevent the magnet 9 from colliding with the flexible printed circuit board 3 when it moves. The coil 4 is provided with an input line 41. Inside the coil 4, an output wire 42 is provided on the coil 4. Outside the coil 4, a second clearance groove 32 is provided on the flexible printed circuit board 3 near the input wire 41, and a third clearance groove 33 is provided on the flexible printed circuit board 3 near the output wire 42. The second clearance groove 32 and the third clearance groove 33 are both connected to the first clearance groove 31. The input wire 41 is led out through the second clearance groove 32 and fixed to the first output pad 34 of the flexible printed circuit board 3. The output wire 42 is led out through the third clearance groove 33 and fixed to the second output pad 35 of the flexible printed circuit board 3, which can ensure that the coil 4 is stably fixed on the flexible printed circuit board 3.

[0029] like Figure 1 , Figure 3 As shown, a planar spring 5 is arranged around the coil 4. The planar spring 5 is circular. A support base 6 is fixed to the outer periphery of the bottom wall of the planar spring 5. The support base 6 is through-shaped in the middle. The bottom wall of the support base 6 is fixed to the bracket 1. A notch 61 is opened near the flexible printed circuit board 3 to avoid the flexible printed circuit board 3. In this embodiment, the support base 6 is annular. A placement groove 51 is opened in the middle of the planar spring 5. The placement groove 51 is circular. Multiple arc-shaped grooves 52 are staggered around the placement groove 51 around the planar spring 5. In this embodiment, three arc-shaped grooves 52 are staggered around the circular placement groove 51 around the planar spring 5. The planar spring 5 and the support base 6 are both obtained by stainless steel wire cutting or punching. The thickness of the planar spring 5 is 0.04-0.08mm, and the height of the support base 6 is 0.25-0.5mm. Preferably, the thickness of the planar spring 5 is 0.05mm, and the height of the support base 6 is 0.3mm.

[0030] like Figure 1As shown, a magnet 9 is disposed inside the coil 4. The top wall of the magnet 9 is fixed to the magnetic guide plate 8, the periphery of the magnetic guide plate 8 is fixed to the mass block 7, and the bottom wall of the mass block 7 is fixed to the planar spring 5. The mass block 7 is a stepped frustum, the diameter of the bottom of the mass block 7 is smaller than the diameter of the top, and the middle of the mass block 7 is through. An installation groove 71 is opened on the periphery of the top wall of the mass block 7 near the through point. The magnetic guide plate 8 is fixed in the installation groove 71, and the magnet 9 is disposed at the through point of the mass block 7. In this embodiment, the magnet 9 is made of neodymium iron boron, the magnetic guide plate 8 is made of stainless steel, and the mass block 7 is made of tungsten alloy.

[0031] In use, the two input pads at the input end of the flexible printed circuit board 3 are connected to the sine wave generator to load a periodic sine wave signal onto the motor. The coil 4 connected to the flexible printed circuit board 3 will generate a periodic magnetic field. This magnetic field will generate an electromagnetic force that attracts (repels) the magnet 9, thereby pushing the mass block 7 to move in the Z direction. Under the action of the planar spring 5, the mass block 7 can perform periodic simple harmonic motion. The simple harmonic motion of the mass block 7 drives the motor and the equipment attached to the motor to move, forming a vibration signal and providing the user with a vibration experience.

[0032] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 utility model.

Claims

1. A miniature linear motor, characterized in that, Includes bracket (1), planar spring (5), and support base (6); A planar spring (5) is provided on the bracket (1) via a support base (6). The support base (6) is located on the periphery of the bottom of the planar spring (5). A placement groove (51) is provided in the middle of the planar spring (5). Multiple arc-shaped grooves (52) are interlaced around the placement groove (51) on the planar spring (5).

2. The micro linear motor according to claim 1, characterized in that: It also includes a flexible printed circuit board (3), and a notch (61) is provided on one side of the support base (6). The output end of the flexible printed circuit board (3) passes through the notch (61) and is fixed on the bracket (1).

3. The micro linear motor according to claim 2, characterized in that: The support base (6) is arranged in a circular shape.

4. The micro linear motor according to claim 2, characterized in that: A coil (4) is fixed at the output end of the flexible printed circuit board (3), and the coil (4) is set through the placement slot (51).

5. The micro linear motor according to claim 4, characterized in that: The coil (4) has an inlet wire (41) located inside the coil (4) and an outlet wire (42) located outside the coil (4). The flexible printed circuit board (3) has a second clearance groove (32) near the inlet wire (41) and a third clearance groove (33) near the outlet wire (42). The inlet wire (41) is led out through the second clearance groove (32) and fixed to the first output pad (34) of the flexible printed circuit board (3). The outlet wire (42) is led out through the third clearance groove (33) and fixed to the second output pad (35) of the flexible printed circuit board (3).

6. The micro linear motor according to claim 4, characterized in that: A first clearance groove (31) is provided on the flexible printed circuit board (3) near the coil (4), and the coil (4) is fixed on the flexible printed circuit board (3) around the first clearance groove (31).

7. The micro linear motor according to claim 4, characterized in that: A magnet (9) is installed inside the coil (4). The top wall of the magnet (9) is fixed on the magnetic guide plate (8). The outer periphery of the magnetic guide plate (8) is fixed on the mass block (7). The bottom wall of the mass block (7) is fixed on the planar spring (5).

8. The micro linear motor according to claim 7, characterized in that: The mass block (7) is a stepped frustum. The diameter of the bottom of the mass block (7) is smaller than the diameter of the top. The mass block (7) is through the middle. The top wall of the mass block (7) near the through point has an installation groove (71). A magnetic plate (8) is fixed in the installation groove (71). A magnet (9) is placed at the through point of the mass block (7).

9. The miniature linear motor according to claim 1, characterized in that: The thickness of the planar spring (5) is 0.04-0.08mm, and the height of the support base (6) is 0.25-0.5mm.

10. The miniature linear motor according to claim 1, characterized in that: The bracket (1) has a housing (2) fixed on its top wall. The housing (2) is hollow, and the planar spring (5) and the support base (6) are set inside the housing (2).

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