Large-drive large-damping linear vibration motor

Abstract

The utility model discloses a large-drive large-damping linear vibration motor, which comprises a lower bracket and a casing, the casing is connected above the lower bracket, a stator assembly is connected at the middle position above the lower bracket, the stator assembly comprises a flexible circuit board and a coil assembly arranged above the flexible circuit board, and the coil assembly is connected with the lower bracket. The interior of the machine shell is connected with a vibrator assembly through a spring, the vibrator assembly comprises a mass block, the interior of the mass block is connected with a magnetic steel assembly, and the magnetic steel assembly comprises two oppositely-arranged first permanent magnets and two oppositely-arranged second permanent magnets. The same magnetic poles of the two first permanent magnets and the same magnetic poles of the two second permanent magnets are oppositely arranged, and the magnetic poles of the first permanent magnets and the second permanent magnets facing the central position of the mass block are oppositely arranged, so that the electromagnetic force is extremely small in the non-working vibration direction after the coil is electrified, and the vibration quantity in the non-vibration direction is ensured to be extremely small; therefore, the hand feeling of the whole application end is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vibration motors, and particularly relates to a large-drive and large-damping linear vibration motor. Background Technique

[0002] As the tactile source of products such as smartphones and smart wearables, with the increasing experience requirements of users, the structure has also undergone earth-shaking changes. From cylindrical motors to flat motors and then to linear motors, the provided tactile sensations are becoming more diverse and delicate. Currently, in high-end devices, in order to pursue the experience, linear motors are basically used across the board.

[0003] With the gradual maturity of terminal vibration applications, there are more and more requirements for linear vibration motors. For example, in some scenarios, due to the need for the overall feel of the machine, it is required that the vibration sensation in the other two orthogonal directions except the designed vibration direction of the motor is as low as possible; at the same time, it is required that the magnetic field strength leaking out of the motor is as small as possible, so as to reduce the influence of the permanent magnet inside the motor on the signals and working states of other electromagnetic devices in the terminal; at the same time, there are also high requirements for the start-up and stop times of the motor.

[0004] Therefore, there is an urgent need for a large-drive and large-damping linear vibration motor. Content of the Utility Model

[0005] In order to solve the problems raised in the above background technique. The utility model provides a large-drive and large-damping linear vibration motor, which has the characteristics that except for the vibration direction, the vibration amounts in the other two orthogonal directions are very small and the magnetic induction intensity leaking outside is extremely small, and basically does not affect external electromagnetic devices.

[0006] To achieve the above object, the utility model provides the following technical solution: A large-drive and large-damping linear vibration motor, including a lower bracket and a housing. Among them, the housing is connected above the lower bracket, and a stator assembly is connected to the middle position above the lower bracket. The stator assembly includes a flexible circuit board and a coil assembly arranged above the flexible circuit board. An oscillator assembly is connected inside the housing through a spring. The oscillator assembly includes a mass block, and a magnetic steel assembly is connected inside the mass block. The magnetic steel assembly includes two oppositely arranged first permanent magnets and two oppositely arranged second permanent magnets. The two first permanent magnets are arranged with the same magnetic poles facing each other, and the two second permanent magnets are arranged with the same magnetic poles facing each other. The magnetic poles of the first permanent magnet and the second permanent magnet facing the center position of the mass block are opposite.

[0007] In order to increase the drive while reducing the risk of demagnetization of the second permanent magnet, further, the outside of the second permanent magnet is coated with a pole piece, and the pole piece is of a "U" - shaped structure. The pole piece is made of a high-permeability material.

[0008] In order to ensure that the coil will not be conductive with the iron core during winding, and at the same time not affect the iron core being fixed to the lower bracket by welding or bonding, the coil assembly further includes an iron core and a coil, wherein the coil is wound on the iron core, and an insulating layer is plated on the surface of the iron core.

[0009] To eliminate the need for additional assembly space, the gap between the spring shape and the mass block is directly utilized, combined with its high viscosity to establish the position. After the glue cures, it adheres to both the spring and the mass block simultaneously. In the initial position, there is no deformation or stress, ensuring that the motor frequency response curve is a smooth, nearly symmetrical peak. High and low frequencies change smoothly with frequency, without a noticeable drop-off phenomenon, which is beneficial for application-end regulation. Furthermore, a damping block is connected to the corner of the spring and the mass block. The damping block is a high-viscosity damping rubber component.

[0010] In order to ensure that the spring is in a safe space when deforming in the stroke direction and does not collide with the housing or the mass block, thereby increasing the reliability of the motor and reducing noise, a baffle is further connected to the other side of the spring welding surface.

[0011] In order to prevent the spring from being deformed too much during mechanical testing or in harsh environments, thereby causing plastic deformation or breakage, a limit block corresponding to the spring is further connected to the inner top of the housing.

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

[0013] 1. In the present invention, the two first permanent magnets are arranged with the same poles facing each other, and the two second permanent magnets are arranged with the same poles facing each other, and the poles of the first permanent magnets and the second permanent magnets facing the center of the mass block are arranged in opposite directions. After the coil is energized, the electromagnetic force in the non-working vibration direction is extremely small, ensuring that the vibration amount in the non-vibration direction is very small, thereby improving the feel of the entire device at the application end;

[0014] 2. The magnetic circuit design adopted by the utility model can maximize the convergence of the magnetic field and reduce the leakage magnetic field on the surface of the casing and the lower bracket, so as not to affect the external electromagnetic devices;

[0015] 3. This utility model adopts a rectangular structure. Compared with circular linear motors, it can be designed with different length and width dimensions, meeting the design requirements of many existing flat terminals. It makes room for core components such as batteries while ensuring that performance is not affected.

[0016] 4. The pole piece of the utility model is covered on three sides of the second permanent magnet except the side of the coil, which increases the drive while reducing the risk of demagnetization of the second permanent magnet;

[0017] 5. The surface of the iron core of the utility model is plated with a very thin organic insulating layer, which ensures that the coil will not be conductive with the iron core when it is wound on it, and does not affect the iron core being fixed to the lower bracket by welding or bonding;

[0018] 6. The damping block is connected to the corner of the spring and the mass block of the utility model. The damping block is made of high-viscosity damping glue, which does not require additional assembly space. The gap between the spring shape and the mass block can be directly used to establish the position combined with its own high viscosity. After the glue cures, it is bonded to the spring and the mass block at the same time. Since it naturally fills the gap and cures, there is no deformation and stress in the initial position. This special state ensures that the motor frequency response curve is a smooth and nearly symmetrical peak shape. The high and low frequencies change smoothly with the frequency without obvious straight-down phenomenon, which is conducive to the regulation of the application end.

[0019] 7. A baffle is connected to the other side of the spring welding surface of the utility model to ensure that the spring is in a safe space when deforming in the stroke direction and will not collide with the casing or mass block, thereby increasing the reliability of the motor and reducing noise;

[0020] 8. The inner top of the housing of the present invention is connected with a limit block corresponding to the spring to prevent the spring from deforming too much and causing plastic deformation or breakage during mechanical testing or harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the explosion structure of the utility model;

[0023] Figure 2 This is a schematic structural diagram of the connection between the lower bracket and the stator assembly of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the connection between the housing and the vibrator assembly of the utility model;

[0025] Figure 4 This is a schematic structural diagram of the second permanent magnet of the present invention;

[0026] Figure 5 This is a schematic structural diagram of the spring of the utility model;

[0027] Figure 6 It is a structural diagram of the utility model;

[0028] Figure 7 For this utility model Figure 6 Schematic diagram of the cross-sectional structure along the AA direction;

[0029] Figure 8 For this utility model Figure 6 Schematic diagram of the cross-sectional structure along the BB direction;

[0030] Figure 9 This is a schematic diagram of the magnetic pole arrangement of the first permanent magnet and the second permanent magnet of the present invention;

[0031] In the figure: 1. lower bracket; 2. flexible circuit board; 3. coil assembly; 31. iron core; 32. coil; 4. magnetic steel assembly; 41. first permanent magnet; 42. second permanent magnet; 43. pole piece; 5. spring; 51. baffle; 6. damping block; 7. mass block; 8. limit block; 9. casing. DETAILED DESCRIPTION

[0032] 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.

[0033] Example 1

[0034] See also Figure 1-9 The utility model provides the following technical solutions: a large-drive and large-damping linear vibration motor, comprising a lower bracket 1 and a casing 9, the lower bracket 1 and the casing 9 can be made of magnetic conductive material or non-magnetic conductive material, the magnetic leakage of the magnetic conductive material can be smaller, and the driving force of the non-magnetic conductive material is greater. In this embodiment, magnetic conductive material is preferably used, wherein the casing 9 is connected to the upper part of the lower bracket 1, and a stator assembly is connected to the middle position above the lower bracket 1, the stator assembly includes a flexible circuit board 2 and a coil assembly 3 arranged above the flexible circuit board 2, the interior of the casing 9 is connected to a vibrator assembly through a spring 5, the vibrator assembly includes a mass block 7, the interior of the mass block 7 is connected to a magnetic steel assembly 4, the magnetic steel assembly 4 includes two oppositely arranged first permanent magnets 41 and two oppositely arranged second permanent magnets 42, the two first permanent magnets 41 are arranged opposite to each other with the same magnetic poles, the two second permanent magnets 42 are arranged opposite to each other with the same magnetic poles, and the magnetic poles of the first permanent magnet 41 and the second permanent magnet 42 facing the center position of the mass block 7 are opposite.

[0035] By adopting the above technical solution, in the present utility model, the two first permanent magnets 41 are arranged with the same magnetic poles facing each other, the two second permanent magnets 42 are arranged with the same magnetic poles facing each other, and the magnetic poles of the first permanent magnet 41 and the second permanent magnet 42 facing the center position of the mass block 7 are arranged in the opposite direction. After the coil 32 is energized, the electromagnetic force is extremely small in the non-working vibration direction, ensuring that the vibration amount in the non-vibration direction is very small, thereby improving the feel of the whole machine at the application end; the magnetic circuit design adopted by the present utility model can maximize the convergence of the magnetic field and reduce the magnetic leakage on the surface of the machine shell and the surface of the lower bracket, so as not to affect external electromagnetic devices; the present utility model adopts a rectangular structure, and different length and width dimensions can be designed relative to the circular linear motor, meeting the design requirements of many existing flattened terminals, and ensuring that the performance is not affected while making room for core components such as batteries.

[0036] Specifically, the outside of the second permanent magnet 42 is coated with a pole piece 43. The pole piece 43 is of a "C" - shaped structure. The pole piece 43 is made of a high - permeability material, including but not limited to one of silicon steel, ferritic stainless steel, and low - carbon steel. In this embodiment, it is preferably ferritic stainless steel.

[0037] By adopting the above technical solution, the pole piece 43 is coated on three sides of the second permanent magnet 42 except the side where the coil is located, increasing the drive while reducing the risk of demagnetization of the second permanent magnet 42.

[0038] In addition, the outside of the first permanent magnet 41 can also be coated with a pole piece. Not coating the pole piece can reduce the manufacturing cost, while coating the pole piece can further improve the drive and the thermal stability of the magnetic field.

[0039] Specifically, the coil assembly 3 includes an iron core 31 and a coil 32. Among them, the coil 32 is wound around the iron core 31, and a very thin organic insulating layer is plated on the surface of the iron core 31.

[0040] By adopting the above technical solution, it is ensured that the coil 32 will not conduct electricity with the iron core 31 when wound thereon, and at the same time, it does not affect the fixing of the iron core 31 on the lower bracket 1 by means of welding or bonding.

[0041] Embodiment 2

[0042] The difference between this embodiment and Embodiment 1 is that: specifically, a damping block 6 is connected between the bent portion of the spring 5 and the corner of the mass block 7. The damping block 6 is made of a high - viscosity damping glue material.

[0043] By adopting the above technical solution, no additional assembly space is required. The gap between the spring shape and the mass block can be directly utilized, combined with its own high viscosity to establish the position. After the glue cures, it is bonded to the spring and the mass block at the same time. Since it is naturally filled in the gap and cured, there is no deformation and stress in the initial position. This special state ensures that the motor frequency response curve is a smooth and approximately symmetrical peak shape, and the high and low frequencies change smoothly with the frequency without obvious straight-down phenomenon, which is conducive to the regulation of the application end.

[0044] Example 3

[0045] The difference between this embodiment and the first embodiment is that: specifically, a blocking piece 51 is connected to the other side of the welding surface of the spring 5 .

[0046] By adopting the above technical solution, it is ensured that the spring 5 is in a safe space when deforming in the stroke direction and will not collide with the housing 9 or the mass block 7, thereby increasing the reliability of the motor and reducing noise.

[0047] Example 4

[0048] The difference between this embodiment and the first embodiment is that: specifically, a limit block 8 corresponding to the spring 5 is connected to the inner top of the housing 9 .

[0049] By adopting the above technical solution, the spring 5 is prevented from being deformed excessively during mechanical tests or in harsh environments, thereby preventing the spring 5 from being deformed excessively and causing plastic deformation or fracture.

[0050] In summary, in the present invention, the two first permanent magnets 41 are arranged opposite to each other with the same poles, and the two second permanent magnets 42 are arranged opposite to each other with the same poles, and the poles of the first permanent magnet 41 and the second permanent magnet 42 facing the center of the mass block 7 are arranged in opposite directions. After the coil 32 is energized, the electromagnetic force is extremely small in the non-working vibration direction, ensuring that the vibration amount in the non-vibration direction is very small, thereby improving the feel of the entire application end machine; the magnetic circuit design adopted by the present invention can maximize the convergence of the magnetic field and reduce the leakage magnetic flux on the surface of the casing and the surface of the lower bracket, so as not to affect the external electromagnetic components; the present invention adopts a rectangular structure, and different length and width dimensions can be designed compared to the circular linear motor, meeting the design requirements of many existing flat terminals, making room for core components such as batteries while ensuring that performance is not affected; the pole piece 43 of the present invention is coated on the three sides of the second permanent magnet 42 except for one side of the coil, while increasing the drive and reducing the risk of demagnetization of the second permanent magnet 42; the surface of the iron core 31 of the present invention is plated with a very thin organic insulating layer to ensure that the coil 32 will not be in contact with the iron core 3 when it is wound thereon 1 is conductive, while not affecting the iron core 31 being fixed to the lower bracket 1 by welding or bonding. The corner of the curved portion of the spring 5 and the mass block 7 of the utility model is connected to a damping block 6. The damping block 6 is made of high-viscosity damping glue and does not require additional assembly space. It can directly utilize the gap between the spring shape and the mass block and establish its position in combination with its own high viscosity. After the glue cures, it is simultaneously bonded to the spring and the mass block. Since it naturally fills the gap and cures, there is no deformation and stress in the initial position. This special state ensures that the motor frequency response curve is a smooth, approximately symmetrical peak shape, with high and low frequencies changing smoothly with frequency without obvious straight-down phenomenon, which is beneficial to the regulation of the application end. The other side of the welding surface of the spring 5 of the utility model is connected to a baffle 51 to ensure that the spring 5 is in a safe space when deforming in the stroke direction and does not collide with the housing 9 or the mass block 7, thereby increasing the reliability of the motor and reducing noise. The inner top of the housing 9 of the utility model is connected to a limit block 8 corresponding to the spring 5 to prevent the spring 5 from deforming too much during mechanical testing or harsh environments, resulting in plastic deformation or fracture.

[0051] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A large-drive large-damping linear vibration motor, characterized in that: It includes a lower bracket and a housing. Among them, the housing is connected above the lower bracket. A stator assembly is connected to the middle position above the lower bracket. The stator assembly includes a flexible circuit board and a coil assembly disposed above the flexible circuit board. An oscillator assembly is connected inside the housing through a spring. The oscillator assembly includes a mass block. A magnet assembly is connected inside the mass block. The magnet assembly includes two relatively arranged first permanent magnets and two relatively arranged second permanent magnets. The two first permanent magnets are arranged with the same magnetic poles facing each other, and the two second permanent magnets are arranged with the same magnetic poles facing each other. The magnetic poles of the first permanent magnet and the second permanent magnet facing the center position of the mass block are opposite to each other.

2. A large-drive large-damping linear vibration motor according to claim 1, characterized in that: The outside of the second permanent magnet is coated with a pole piece, and the pole piece is in a "C" - shaped structure.

3. A large-drive large-damping linear vibration motor according to claim 2, characterized in that: The pole piece is made of a high - permeability material.

4. A large-drive large-damping linear vibration motor according to claim 1, characterized in that: The coil assembly includes an iron core and a coil. Among them, the coil is wound around the iron core, and an insulating layer is plated on the surface of the iron core.

5. The large-drive large-damping linear vibration motor according to claim 1, characterized in that: A damping block is connected between the bent portion of the spring and the corner of the mass block.

6. A large-drive large-damping linear vibration motor according to claim 5, characterized in that: The damping block is a high - viscosity damping glue component.

7. The large-drive large-damping linear vibration motor according to claim 1, characterized in that: A retaining piece is connected to the other side of the welding surface of the spring.

8. The large-drive large-damping linear vibration motor according to claim 1, characterized in that: A limiting block corresponding to the spring is connected to the inner top of the housing.

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