Flat vibration motor

Abstract

The utility model relates to the technical field of vibration motors, and discloses a flat vibration motor, which comprises a shell assembly, an end cover, a stator assembly, a rotor assembly and a fixed shaft, the shell assembly and the end cover are buckled to form an accommodating space, the stator assembly is fixed on the inner surface of the end cover, and the fixed shaft is fixed in the center of the end cover. The rotor assembly is arranged on the fixed shaft in a sleeving manner and rotates around the fixed shaft, the shell assembly comprises two separation blades which are vertically arranged in the accommodating space in a spaced manner and springback sheets which are adaptively arranged on the inner sides of the separation blades, and the rotor assembly comprises a bracket, elastic mechanisms which are positioned on two sides of the bracket, an eccentric hammer which is fixed on the bracket and a first magnet which is embedded in the eccentric hammer; the stator assembly comprises a flexible circuit board, an annular coil and a second magnet embedded in the coil; the first magnet and the second magnet are vertically and correspondingly arranged at intervals so as to attract each other to maintain the initial position of the rotor assembly, square wave current is switched to the coil to generate a magnetic field, and the magnetic field and the first magnet perform mutual attraction and mutual exclusion rotary motion, so that more diversified vibration modes are realized, and the vibration sense is stronger.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration motors, in particular to a flat vibration motor. Background Art

[0002] With the development of electronic technology, portable consumer electronic products have gradually occupied the global consumer market, such as mobile phones, handheld game consoles, multimedia entertainment equipment, etc. These electronic products generally use vibration motors for tactile feedback, such as incoming call reminders on mobile phones, vibration feedback on game consoles, etc. If such a wide range of applications is to be met, the vibration performance requirements of vibration motors will become higher and higher. Existing vibration motors usually have chip-type cylindrical vibration motors. The eccentric weight arranged on the rotating shaft realizes high-speed rotation under the driving force of the motor, but the vibration mode of the chip-type cylindrical vibration motor is single, and the vibration experience obtained by customers is also relatively single. Therefore, it is necessary to provide a vibration motor with more diverse vibration modes and stronger vibration. Utility Model Content

[0003] The purpose of the utility model is to provide a flat vibration motor with strong vibration feeling, and its specific technical scheme is as follows:

[0004] A flat vibration motor comprises a shell assembly, an end cover, a stator assembly, a rotor assembly and a fixed shaft, wherein the shell assembly and the end cover are buckled to form a containing space, wherein the stator assembly, the rotor assembly and the fixed shaft are contained in the containing space, wherein the stator assembly is fixed on the inner surface of the end cover, wherein the fixed shaft is fixed at the center of the end cover, wherein the rotor assembly is sleeved on the fixed shaft and rotates around the fixed shaft, wherein the shell assembly comprises two baffles which are spaced apart and vertically disposed in the containing space and a rebound sheet which is adapted to be disposed on the inner side of the baffles, wherein the rotor assembly comprises a bracket, an elastic mechanism located on both sides of the bracket, an eccentric weight fixed on the bracket, and a first magnet embedded in the eccentric weight; wherein the stator assembly comprises a flexible circuit board, a ring coil and a second magnet embedded in the coil; wherein the first magnet and the second magnet are disposed at corresponding intervals up and down.

[0005] Preferably, the shell assembly further comprises a circular plate-shaped bottom wall and side walls vertically bent in the same direction from the edge of the bottom wall, and the blocking piece is formed by punching and vertically bending on the same side of the center of the bottom wall to form a bilaterally symmetrical blocking piece.

[0006] Preferably, the rotor assembly further comprises a sliding bearing for fixing the bracket and the eccentric weight at the same time.

[0007] Preferably, the bracket includes a fan-shaped plate-like body, a through hole arranged at the center of the body and adapted to the sliding bearing, and the elastic mechanism integrally bent to protrude from both sides of the body; the axial projection of the body coincides with the eccentric hammer; and the elastic mechanism is adapted to be arranged with the rebound sheet.

[0008] Preferably, the rebound sheet is located between the blocking sheet and the elastic mechanism, the elastic mechanism is located between the eccentric weight and the rebound sheet, and the shape of the rebound sheet is adapted to the blocking sheet.

[0009] Preferably, an axial projection area of ​​the first magnet is larger than an area of ​​the second magnet.

[0010] Preferably, the single swing angle of the rotor assembly is 3°-7°.

[0011] Preferably, the sliding bearing protrudes axially from an upper surface of the body and a lower surface of the eccentric weight, respectively.

[0012] Preferably, the axial thickness of the eccentric weight is consistent with the axial thickness of the first magnet; the axial thickness of the coil is consistent with the axial thickness of the second magnet.

[0013] Preferably, the outer surface of the bottom wall is adapted to be covered with a dustproof sheet.

[0014] Compared with the prior art, the beneficial effects of the utility model are: the initial position of the rotor assembly is maintained by the mutual attraction between the first magnet and the second magnet, and the magnetic field generated by switching the square wave current supplied to the coil attracts and repels the first magnet to produce rotational motion, thereby achieving more diverse vibration modes and stronger vibration sensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural explosion diagram of the utility model.

[0016] Figure 2 It is an axial cross-sectional view of the utility model.

[0017] Figure 3 It is a three-dimensional diagram of the bracket of the present utility model.

[0018] Figure 4A It is a schematic diagram of the initial position of the rotor assembly of the utility model.

[0019] Figure 4B It is a schematic diagram of the rotation position of the rotor assembly of the utility model.

[0020] in:

[0021] 1-housing assembly; 10-bottom wall; 11-side wall; 12-blocking piece; 13-rebounding piece; 14-dustproof piece;

[0022] 2-end cover; 20-shaft fixing part;

[0023] 3- rotor assembly; 30- eccentric weight; 31- first magnet; 32- bracket; 33- sliding bearing;

[0024] 320-body; 321-elastic mechanism; 322-through hole;

[0025] 4-stator assembly; 40-flexible circuit board; 41-coil; 410-second magnet;

[0026] 5-Fixed axis;

[0027] 6- Gasket;

[0028] 7- Slide. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] A flat vibration motor structure is as follows Figure 1 and Figure 2 , including a shell assembly 1, an end cover 2, a rotor assembly 3, a stator assembly 4 and a fixed shaft 5. The shell assembly 1 is a hollow cylindrical structure with one end open, and the end cover 2 is plate-shaped. The shell assembly 1 and the end cover 2 are buckled to form an accommodating space (not marked). The rotor assembly 3, the stator assembly 4 and the fixed shaft 5 are accommodated in the accommodating space. The stator assembly 4 is fixed on the inner surface of the end cover 2, and the fixed shaft 5 is fixed at the center of the end cover 2. The rotor assembly 3 is sleeved on the fixed shaft 5 and rotates around it. In order to ensure that the fixed shaft 5 firmly supports the rotation of the rotor assembly 3, a raised shaft fixing portion 20 is formed by stretching at the center of the end cover 2 to enhance the stability of the fixed combination of the fixed shaft 5 and the end cover 2.

[0031] The housing assembly 1 includes a circular plate-shaped metal bottom wall 10 and a side wall 11 formed by vertically bending in the same direction from the edge of the bottom wall 10. The side wall 11 is buckled with the end cover 2 to form a receiving space. The center of the bottom wall 10 is punched and vertically bent to form a left-right symmetrical baffle 12. The metal baffle 12 extending into the receiving space has a certain damping effect. The free end of the baffle 12 extends into the receiving space. The inner side of the baffle 12 is adapted to be provided with a rebound sheet 13, and the shape of the rebound sheet 13 is adapted to the baffle 12. Since the bottom wall 10 has an opening (not marked) due to punching the bottom wall 10 and bending to form the baffle 12, the outer surface of the bottom wall 10 is adapted to be covered with a dustproof sheet 14 to prevent foreign impurities from entering the receiving space through the opening and affecting the rotation of the rotor assembly 3. At the same time, the dustproof sheet 14 is made of foam. When the vibration motor (not marked) is placed in a packaging box for standby use, especially during transportation, it can play a shock-absorbing role, thereby reducing the risk of damage to the vibration motor due to impact.

[0032] The rotor assembly 3 includes a metal bracket 32, elastic mechanisms 321 located on both sides of the bracket 32, an eccentric weight 30 bonded or welded to the lower surface of the bracket 32, a first magnet 31 embedded in the eccentric weight 30, and a sliding bearing 33 that fixes the bracket 32 ​​and the eccentric weight 30 at the same time; the axial thickness of the eccentric weight 30 is consistent with the axial thickness of the first magnet 31, so that the first magnet 31 can be completely embedded in the eccentric weight 30 without being wrapped by the eccentric weight 30, and will not affect the role of the first magnet 31 in the magnetic field; the structure of the bracket 32 ​​is as follows Figure 3As shown, it includes a fan-shaped plate-like body 320, a through hole 322 arranged at the center of the body 320 and adapted to the sliding bearing 33, and an elastic mechanism 321 that is bent integrally to protrude from both sides of the body 320; the elastic mechanism 321 is located below the body 320 and is adapted to the rebound sheet 13, the rebound sheet 13 is located between the baffle 12 and the elastic mechanism 321, and the elastic mechanism 320 is located between the eccentric weight 30 and the rebound sheet 13; the metal baffle 12 is used to limit the rotation of the rotor assembly 3; the rebound sheet 13 is made of a high-rebound plastic material, such as polyethylene high-rebound plastic or polycarbonate high-rebound plastic, which can prevent the elastic mechanism from The structure 321 directly collides with the baffle 12 to generate noise, and at the same time has high resilience, so that the elastic mechanism 321 can be buffered and stably rebounded, maintaining long-term comfort and supporting force, and realizing rapid resetting of the rotor assembly 3. At the same time, the elastic mechanism 321 has a limiting function, which can help the eccentric weight 30 to be quickly positioned on the bracket 32; the axial projection of the main body 320 coincides with the eccentric weight 30, and the position of the eccentric weight 30 corresponding to the through hole 322 is also penetrated by a through hole (not marked) that is adapted to be connected to the through hole 322 for passing the sliding bearing 33, so as to ensure the consistency of the rotor assembly 3 during the rotation and swinging process, thereby improving the vibration performance of the vibration motor. The rotor assembly 3 is sleeved on the fixed shaft 5 through the sliding bearing 33 to support the rotor assembly 3 to rotate around the fixed shaft 5. The sliding bearing 33 protrudes from the upper surface of the body 320 and the lower surface of the eccentric weight 30 in the axial direction, respectively, to prevent the eccentric weight 30 below from hitting the coil 41 and the upper body 320 from hitting the inner surface of the bottom wall 10. At the same time, in order to prevent the sliding bearing 33 from abutting against the inner surface of the bottom wall 10 and causing friction to damage the bottom wall 10 as the rotor assembly 3 rotates, a sliding plate 7 is arranged between the bottom wall 10 and the sliding bearing 33 to prevent the housing assembly 1 from being damaged. The height of the shaft fixing portion 20 is set to be smaller than the axial height of the coil 41 to prevent the shaft fixing portion 20 from directly contacting the sliding bearing 33 to affect the stability of the fixed shaft 5; in addition, a gasket 6 is arranged between the shaft fixing portion 20 and the sliding bearing 33 to limit the distance between the rotor assembly 3 and the stator assembly 4, so the vibration motor can adjust the thickness of the gasket 6 according to actual needs. The pendulum angle of the rotor assembly 3 is set to 3°-7°. Since the pendulum motion is affected by factors such as air resistance and friction coefficient, in actual use, the initial angle and pendulum length of the rotor assembly 3 can be adjusted by adjusting the arc and mass of the eccentric weight 30 to optimize the vibration effect. Preferably, the vibration amount is best when the pendulum angle of the rotor assembly 3 is 5°, because the pendulum angle of 5° is close to simple harmonic motion, thereby achieving a larger vibration amount of the rotor assembly 3.

[0033] The stator assembly 4 includes a flexible circuit board 40, an annular coil 41 and a second magnet 410 embedded in the coil. By energizing the coil 41 to generate a magnetic field and drive the rotor assembly 3 equipped with the first magnet 31 to rotate, the vibration motor of the utility model adopts a square wave current. In the process of switching the current, the magnetic field generated by the energization of the coil 41 and the first magnet 31 attract and repel each other, so that the rotor assembly 3 rotates. The first magnet 31 and the second magnet 410 are arranged at intervals up and down, and the axial projection area of ​​the first magnet 31 is larger than the area of ​​the second magnet 410; the first magnet 31 is made of a strong magnetic material, which is used to generate a force of mutual attraction and repulsion with the magnetic field generated by the energization of the coil 41; the second magnet 410 is a weak magnetic material, which is mainly used to be magnetically attracted by the first magnet 31. When the coil 41 is powered off, the rotor assembly 3 is ensured to be in the initial position by the mutual attraction between the first magnet 31 and the second magnet 410. At this time, the rotor assembly 3 stops symmetrically on the central axis of the coil 41 and the second magnet 410. The axial thickness of the coil 41 is consistent with the axial thickness of the second magnet 410 , so that the second magnet 410 can be completely embedded in the coil 41 while not being wrapped by the coil 41 , ensuring that the second magnet 410 can be magnetically attracted by the first magnet 31 .

[0034] The assembly steps of a flat vibration motor of the utility model are as follows:

[0035] First, the bottom wall 10, the side wall 11 and the baffle 12 of the housing assembly 1 are formed by punching, the dustproof sheet 14 is bonded and fixed on the outer surface of the bottom wall 10, the sliding sheet 7 is welded and fixed at the center of the inner surface of the bottom wall 10, and the springback sheet 13 is fixed on the inner surface of the baffle 12 to complete the housing assembly 1;

[0036] Then, the body 320 of the bracket 32, the through hole 322 at the center of the body 320 and the elastic mechanisms 321 on both sides are formed by punching, the eccentric weight 30 embedded with the first magnet 31 is bonded or welded to the lower surface of the body 320, and the sliding bearing 33 is embedded in the integrally fixed eccentric weight 30 and the bracket 32 ​​to complete the rotor assembly 3;

[0037] Then, the coil 41 embedded with the second magnet 410 is bonded and fixed on the flexible circuit board 40 to complete the stator assembly 4;

[0038] Then, fix the fixed shaft 5 at the center of the end cover 2, glue and fix the stator assembly 4 to the inner surface of the end cover 2, and sleeve the gasket 6 and the rotor assembly 3 on the fixed shaft 5;

[0039] Finally, the side wall 10 of the housing assembly 1 is welded and fixed to the end cover 2 to complete the flat vibration motor.

[0040] The working principle of the flat vibration motor of the utility model is as follows Figure 4A and Figure 4B As shown:

[0041] When the coil 41 is not energized, the N pole of the first magnet 31 attracts the S pole of the second magnet 410, and the rotor assembly 3 is positioned at the initial position on the center line of the two baffles 12;

[0042] When the coil 41 is energized, the first magnet 31 at the initial position and the coil 41 form mutual repulsion, pushing the rotor assembly 3 to rotate; when the rotor assembly 3 touches the baffle 12 on one side, the current direction of the coil 41 is switched, the first magnet 31 and the coil 41 form mutual attraction, and the elastic collision between the rebound sheet 13 and the elastic mechanism 321 causes the rotor assembly 3 to rebound and rotate;

[0043] When the rotor assembly 3 rotates to the center line position of the two baffles 12, the current direction of the coil 41 is switched, the first magnet 31 and the coil 41 form mutual repulsion, and continue to push the rotor assembly 3 to rotate. When the rotor assembly 3 touches the baffle 12 on the other side; the current direction of the coil 41 is switched, the first magnet 31 and the coil 41 form mutual attraction, and the elastic collision between the rebound sheet 13 and the elastic mechanism 321 causes the rotor assembly 3 to rebound and rotate.

[0044] The utility model discloses a flat vibration motor that makes the rotor assembly 3 swing back and forth according to this working principle. When the rotor assembly 3 is located at the initial position, the angle between the eccentric weight 30 and the two sides of the baffle 12 is X; when the rotor assembly 3 touches the baffle 12 on one side, the angle between the eccentric weight 30 and the baffle 12 on the other side is Y; the single pendulum angle obtained by subtracting X from Y is 3°-7°. Preferably, when the single pendulum angle is 5°, the eccentric weight 30 can generate stronger vibration, allowing the user to feel a very high-quality strong vibration.

[0045] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "horizontal direction", "vertical direction" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flat vibration motor, comprising a housing assembly, an end cover, a stator assembly, a rotor assembly and a fixed shaft, wherein the housing assembly and the end cover are buckled to form a containing space, the stator assembly, the rotor assembly and the fixed shaft are contained in the containing space, the stator assembly is fixed on the inner surface of the end cover, the fixed shaft is fixed at the center of the end cover, the rotor assembly is sleeved on the fixed shaft and rotates around it, characterized in that: The shell assembly includes two baffles that are spaced apart and vertically placed in the accommodating space and a rebound sheet that is adapted to be arranged on the inner side of the baffles. The rotor assembly includes a bracket, elastic mechanisms located on both sides of the bracket, an eccentric weight fixed on the bracket, and a first magnet embedded in the eccentric weight; the stator assembly includes a flexible circuit board, a ring coil and a second magnet embedded in the coil; the first magnet and the second magnet are arranged at corresponding intervals up and down.

2. The flat vibration motor according to claim 1, characterized in that: The housing assembly further comprises a circular plate-shaped bottom wall and side walls vertically bent in the same direction from the edge of the bottom wall, and the blocking piece is formed by punching and vertically bending on the same side of the center of the bottom wall to form a bilaterally symmetrical blocking piece.

3. The flat vibration motor according to claim 2, characterized in that: The rotor assembly also includes a sliding bearing for fixing the bracket and the eccentric weight at the same time.

4. The flat vibration motor according to claim 3, characterized in that: The bracket includes a fan-shaped plate-like body, a through hole arranged at the center of the body and adapted to the sliding bearing, and the elastic mechanism integrally bent to protrude from both sides of the body; the axial projection of the body coincides with the eccentric weight; the elastic mechanism is adapted to be arranged with the rebound sheet.

5. The flat vibration motor according to claim 4, characterized in that: The rebound sheet is located between the blocking sheet and the elastic mechanism, the elastic mechanism is located between the eccentric weight and the rebound sheet, and the shape of the rebound sheet is adapted to the blocking sheet.

6. The flat vibration motor according to claim 5, characterized in that: An axial projection area of ​​the first magnet is larger than an area of ​​the second magnet.

7. The flat vibration motor according to claim 6, characterized in that: The single swing angle of the rotor assembly is 3°-7°.

8. The flat vibration motor according to claim 7, characterized in that: The sliding bearing protrudes axially from the upper surface of the body and the lower surface of the eccentric weight respectively.

9. The flat vibration motor according to claim 8, characterized in that: The axial thickness of the eccentric weight is consistent with the axial thickness of the first magnet; the axial thickness of the coil is consistent with the axial thickness of the second magnet.

10. The flat vibration motor according to claim 9, characterized in that: The outer surface of the bottom wall is adapted to be covered with a dustproof sheet.

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