Compact large-damping linear vibration motor

Abstract

The utility model discloses a compact large-damping linear vibration motor, which comprises a casing and a support, a flexible circuit board is connected above the support, a coil is connected above the flexible circuit board, the casing is connected above the support, a mass block is arranged inside the casing, a magnetic steel assembly is connected inside the mass block, and the magnetic steel assembly is connected above the flexible circuit board. The two sides of the mass block are connected with the machine shell through springs, and the two sides of the upper end of the mass block are connected with limiting protruding blocks respectively. According to the utility model, the two sides of the upper end of the mass block are respectively connected with the limiting bumps, so that the motor can be used for limiting during mechanical impact, the weight of the vibrator is increased, and the performance of the motor is optimized, that is, the spring stress is reduced and the service life of the motor is prolonged on the basis that the performances such as frequency and vibration quantity are not changed.

Description

Technical Field

[0001] The utility model belongs to the technical field of vibration motors, and in particular relates to a compact large-damping linear vibration motor. Background Art

[0002] Motors are essential components for vibration in smartphones, smart wearables, and other products. However, due to the increasing number of functional hardware, motors are becoming smaller and smaller, while maintaining a fast and crisp response time.

[0003] The linear motor in the prior art, such as the linear motor disclosed in Chinese patent application No. 202021091046.6, requires slots to be cut on the mass block for assembling reinforcement plates in order to improve the drop reliability of the mass block and enhance the performance of the linear motor, and also requires corresponding limit blocks to be set.

[0004] Although the above-mentioned patent improves the drop reliability of the mass block and enhances the performance of the linear motor, it requires slotting on the mass block, which reduces the weight of the vibrator, and also requires the design of a special limiting mechanism, which increases the cost of the motor. Utility Model Content

[0005] The purpose of the present invention is to provide a compact high-damping linear vibration motor to solve the problems mentioned in the above background technology. The present invention provides a compact high-damping linear vibration motor that has the characteristics of ensuring the limiting effect while increasing the weight of the vibrator.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a compact large-damping linear vibration motor, comprising a casing and a bracket, wherein a flexible circuit board is connected to the top of the bracket, a coil is connected to the top of the flexible circuit board, the casing is connected to the top of the bracket, a mass block is provided inside the casing, a magnetic steel assembly is connected to the inside of the mass block, both sides of the mass block are connected to the casing through springs, and limiting protrusions are respectively connected to both sides of the upper end of the mass block.

[0007] In order to effectively restrain the excessive magnetic field on the magnetic field enhancement side of the magnetic steel and reduce the magnetic leakage of the motor, the casing and bracket are made of magnetic stainless steel.

[0008] In order to avoid the limiting bumps and the solder joints on the flexible circuit board, and to adjust the spring stiffness and ultimately the motor frequency, avoidance grooves are further provided on the upper and lower sides of the spring.

[0009] In order to provide a damping effect and reduce the start-up time and stop time of the motor, a damping rubber block is further connected to the inner side of the bent portion of the spring.

[0010] In order to converge the magnetic field on the housing side, increase the magnetic field on the coil side, and improve the drive, the magnetic steel assembly further includes a first magnetic steel, and second magnetic steels are connected to both sides of the first magnetic steel. The first magnetic steel and the two second magnetic steels are arranged in a Halbach array.

[0011] In order to increase the driving force, the inner circle of the coil is further filled with soft magnetic material. The soft magnetic material is a whole piece or laminated soft iron.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. This utility model connects limiting bumps on both sides of the upper end of the mass block, which can be used to limit the position during mechanical impact. At the same time, it increases the weight of the vibrator and optimizes the motor performance. That is, it reduces the spring stress while maintaining the same performance such as frequency and vibration amount, thereby increasing the life of the motor.

[0014] 2. The spring of the utility model is provided with avoidance grooves on the upper and lower sides, which are used to avoid the limit bumps and the solder joints on the flexible circuit board. On the other hand, the size and position of the avoidance grooves can be used to adjust the spring stiffness and ultimately adjust the motor frequency.

[0015] 3. The inner side of the bent portion of the spring of the utility model is connected to a damping rubber block. The damping rubber block is arranged inside the bent portion of the spring, which does not require additional space for damping. It makes rational use of the limited space, provides damping when the motor is working, and reduces the starting and stopping time of the motor.

[0016] 4. The inner ring of the coil of the utility model is filled with soft magnetic material, which is a whole piece or laminated soft iron, which can further increase the driving force;

[0017] 5. The utility model can maximize the use of structural space and can adjust characteristics such as vibration amount, frequency, response time and stop time according to specific usage requirements without making design changes to structural components, greatly improving the applicability and compatibility of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the explosion structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the connection between the mass block and the housing of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the connection between the coil and the flexible circuit board and the bracket of the utility model;

[0021] Figure 4 Schematic diagram of the structure of the mass block of the utility model;

[0022] Figure 5This is a schematic structural diagram of the spring of the utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the magnetic steel assembly of the utility model;

[0024] Figure 7 and 8 They are all schematic cross-sectional views of the present invention;

[0025] In the figure: 1. Housing; 2. Mass block; 21. Limiting protrusion; 3. Magnetic steel assembly; 31. First magnetic steel; 32. Second magnetic steel; 4. Flexible circuit board; 5. Bracket; 6. Coil; 7. Spring; 71. Avoidance groove; 8. Damping rubber block. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example 1

[0028] See also Figure 1-8 The utility model provides the following technical solutions: a compact large-damping linear vibration motor, comprising a housing 1 and a bracket 5, wherein a flexible circuit board 4 is connected to the top of the bracket 5, a coil 6 is connected to the top of the flexible circuit board 4, the housing 1 is connected to the top of the bracket 5, a mass block 2 is provided inside the housing 1, a magnetic steel assembly 3 is connected to the inside of the mass block 2, both sides of the mass block 2 are connected to the housing 1 through springs 7, and both sides of the upper end of the mass block 2 are respectively connected to limit protrusions 21, and the limit protrusions 21 are arranged along the vibration stroke direction.

[0029] By adopting the above technical solution, the utility model connects limiting protrusions 21 on both sides of the upper end of the mass block 2, which can be used for limiting during mechanical impact, while increasing the weight of the vibrator and optimizing the motor performance, that is, reducing the spring stress and improving the motor life on the basis of unchanged performance such as frequency and vibration amount.

[0030] Specifically, the housing 1 and the bracket 5 are both made of magnetic stainless steel, or can be made of soft iron with an anti-rust coating.

[0031] By adopting the above technical solution, the excessive magnetic field on the magnetic field enhancement side (coil side) of the magnetic steel can be effectively restrained, thereby reducing the magnetic leakage of the motor.

[0032] Specifically, the magnetic steel assembly 3 includes a first magnetic steel 31, and two second magnetic steels 32 are connected to both sides of the first magnetic steel 31. The first magnetic steel 31 and the two second magnetic steels 32 are arranged in a Halbach array.

[0033] By adopting the above technical solution, the magnetic field on the casing side is converged, the magnetic field on the coil side is increased, and the drive is improved.

[0034] Example 2

[0035] The difference between this embodiment and embodiment 1 is that: specifically, avoidance grooves 71 are respectively provided on the upper and lower sides of the spring 7. Preferably, the position of the avoidance groove 71 does not extend to the bending corner, so as to maintain the spring stiffness in the non-vibration direction, and at the same time further increase the damping rubber storage space, thereby increasing the upper limit of the damping adjustment.

[0036] By adopting the above technical solution, on the one hand, it is used to avoid the limiting protrusion 21 and the solder joint on the flexible circuit board 4, and on the other hand, the size and position of the avoidance groove 71 can be used to adjust the spring stiffness and ultimately adjust the motor frequency.

[0037] Example 3

[0038] The difference between this embodiment and the first embodiment is that: specifically, a damping rubber block 8 is connected to the inner side of the bent portion of the spring 7, and the damping rubber block 8 is formed by curing the damping rubber.

[0039] By adopting the above technical solution, the damping rubber block 8 is set on the inner side of the bent part of the spring 7, and there is no need to provide additional mechanism space for damping. The limited space is reasonably utilized to provide damping effect when the motor is working, thereby reducing the motor start-up time and stop time.

[0040] Example 4

[0041] The difference between this embodiment and embodiment 1 is that: specifically, the inner ring of the coil 6 is filled with soft magnetic material, and the soft magnetic material is a whole block or laminated soft iron, and a magnetic fluid with curing ability can also be selected.

[0042] By adopting the above technical solution, the driving force is further increased.

[0043] In summary, the present invention connects limiting protrusions 21 on both sides of the upper end of the mass block 2, which can be used for limiting the position during mechanical impact, while increasing the weight of the vibrator and optimizing the motor performance, that is, reducing the spring stress on the basis of unchanged performance such as frequency and vibration amount, thereby improving the life of the motor; the upper and lower sides of the spring 7 of the present invention are respectively provided with avoidance grooves 71, which are used to avoid the limiting protrusions 21 and the solder joints on the flexible circuit board 4 on the one hand, and the size and position of the avoidance grooves 71 can be used to adjust the spring stiffness and ultimately adjust the motor frequency; the inner side of the bent part of the spring 7 of the present invention is connected with a damping rubber block 8 to damp the spring 7. The rubber block 8 is arranged on the inner side of the bent part of the spring 7, and no additional mechanical space is required for damping. The limited space is reasonably utilized to provide damping when the motor is working, thereby reducing the starting time and stopping time of the motor. The inner ring of the coil 6 of the utility model is filled with soft magnetic material, and the soft magnetic material is a whole block or laminated soft iron, which can further increase the driving force. The utility model can maximize the utilization of the structural space and can adjust the vibration amount, frequency, response time and stop time and other characteristics according to specific use requirements without making design changes to the structural components, thereby greatly improving the applicability and compatibility of the structure.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A compact high-damping linear vibration motor, characterized by: It includes a casing and a bracket, wherein a flexible circuit board is connected to the top of the bracket, a coil is connected to the top of the flexible circuit board, the casing is connected to the top of the bracket, a mass block is provided inside the casing, a magnetic steel assembly is connected inside the mass block, both sides of the mass block are connected to the casing through springs, and both sides of the upper end of the mass block are respectively connected to limiting protrusions.

2. The compact high-damping linear vibration motor according to claim 1, characterized in that: The casing and the bracket are both made of magnetic stainless steel.

3. The compact high-damping linear vibration motor according to claim 1, characterized in that: The upper and lower sides of the spring are respectively provided with avoidance grooves.

4. The compact high-damping linear vibration motor according to claim 1, characterized in that: The inner side of the bent portion of the spring is connected with a damping rubber block.

5. The compact high-damping linear vibration motor according to claim 1, characterized in that: The magnetic steel assembly includes a first magnetic steel, and two sides of the first magnetic steel are respectively connected to second magnetic steels.

6. The compact high-damping linear vibration motor according to claim 5, characterized in that: The first magnetic steel and the two second magnetic steels are arranged in a Halbach array.

7. The compact high-damping linear vibration motor according to claim 1, characterized in that: The inner circle of the coil is filled with soft magnetic material.

8. The compact high-damping linear vibration motor according to claim 7, characterized in that: The soft magnetic material is a whole block or laminated soft iron.

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