Vibration motor

Abstract

A vibration motor of the present invention comprises a housing, a vibration unit, a driving unit and a guide member, wherein the vibration unit vibrates in a first direction, the vibration unit comprises a magnetic-steel assembly arranged in the first direction, the magnetic-steel assembly comprises at least two pieces of magnetic steel arranged in the first direction, each piece of magnetic steel is magnetized in the first direction, and every two adjacent pieces of magnetic steel have opposite magnetizing directions; and the driving unit comprises a coil unit for driving the vibration unit to vibrate. The vibration motor further comprises two auxiliary magnetic-steel assemblies fixed to the housing and respectively arranged at two ends of the magnetic-steel assembly; the magnetic steel arranged at the head and tail ends is defined as first magnetic steel, and the two auxiliary magnetic-steel assemblies are arranged corresponding to the two pieces of first magnetic steel on a one-to-one basis; and each auxiliary magnetic-steel assembly is magnetized in a second direction perpendicular to the first direction and forms a magnetic repulsive force with the corresponding piece of first magnetic steel. The vibration motor further comprises a damping unit fixed to the housing and arranged around adjacent ends of two adjacent pieces of magnetic steel. The vibration motor provided in the present invention can start and stop faster.

Description

Vibration motor Technical Field

[0001] This invention relates to the field of motor technology, and more particularly to a linear vibration motor. Background Technology

[0002] With the development of science and technology and the progress of society, portable electronic products, such as mobile phones, handheld game consoles, navigation devices, or handheld multimedia entertainment devices, are widely used in people's daily lives. In some usage scenarios of these electronic products, such as incoming call notifications, message notifications, navigation prompts, and vibration feedback of game consoles, vibration motors are generally used to achieve these functions.

[0003] The vibration motor of the related technology includes a vibration unit and a drive unit. The drive unit is fixed and the vibration unit vibrates to generate vibration. In order to solve the problem of fatigue and fracture of traditional elastic components, the related technology uses the force generated by the repulsion between like poles and the attraction between unlike poles of magnets to replace the traditional spring. Since the horizontal linear vibration motor itself has low damping, foam damping is usually used to improve stability. However, foam damping is greatly affected by temperature and the damping provided is not very stable, which seriously affects the vibration performance of the vibration motor.

[0004] Therefore, it is necessary to provide a product that solves the above problems. Technical issues

[0005] The purpose of this invention is to provide a vibration motor whose vibration unit can start or stop more quickly. Technical solutions

[0006] The present invention also provides a vibration motor, comprising a housing having a receiving space, a vibration unit housed in the receiving space, a drive unit for driving the vibration unit to reciprocate along a first direction, and a guide member supporting the vibration unit. The vibration unit includes a magnet assembly arranged along the first direction, the magnet assembly including at least two magnets arranged along the first direction, each magnet being magnetized along the first direction and adjacent magnets having opposite magnetization directions. The drive unit includes a coil unit for driving the vibration unit to reciprocate. The vibration motor further includes two auxiliary magnet assemblies fixed to the housing and respectively disposed at two ends of the magnet assembly. The magnets arranged at the first and last ends are defined as first magnets. The two auxiliary magnet assemblies are arranged one-to-one with the two first magnets. Each auxiliary magnet assembly is magnetized along a second direction perpendicular to the first direction and forms a magnetic repulsion force with the corresponding first magnet. The vibration motor further includes a damping unit fixed to the housing and disposed around adjacent ends of the two adjacent magnets.

[0007] Preferably, there are two magnets, and the damping unit includes a damping ring fixed to the housing and the damping ring is arranged around the adjacent ends of the two magnets. The damping ring includes an outer surface fixedly connected to the housing and an inner surface opposite to the outer surface. There is one coil unit and the coil unit is fixed to the inner surface.

[0008] Preferably, at least three magnets are provided, the damping unit includes at least one damping ring fixed to the housing, and at least one coil unit is provided. At least one of the damping rings and at least one of the coil units are respectively arranged around the adjacent ends of two different adjacent magnets.

[0009] Preferably, four magnets are provided, and the two magnets arranged between the two first magnets are defined as the second magnet and the third magnet. The damping unit includes a damping ring fixed to the housing and the damping ring is arranged around the adjacent ends of the second magnet and the third magnet. Two coil units are provided, and the two coil units are respectively arranged around the adjacent ends of the first magnet and the second magnet and the adjacent ends of the first magnet and the third magnet.

[0010] Preferably, the number of magnets is four, and the two magnets arranged between the two first magnets are defined as the second magnet and the third magnet. The coil unit is provided and is arranged around the adjacent ends of the second magnet and the third magnet. The damping unit includes two damping rings and the two damping rings are arranged around the adjacent ends of the first magnet and the second magnet and the adjacent ends of the first magnet and the third magnet, respectively.

[0011] Preferably, the material of the damping unit includes at least one selected from iron, aluminum, silver, copper, and gold.

[0012] Preferably, the magnet assembly further includes soft magnets spaced apart along the first direction, wherein the number of soft magnets is one more than the number of magnets, and the magnets are respectively disposed between two adjacent soft magnets.

[0013] Preferably, the vibration unit further includes mass blocks disposed at opposite ends of the magnet assembly, the soft magnet includes a first soft magnet located between the mass blocks and the first magnet and a second soft magnet sandwiched between two adjacent magnets, the coil unit and the damping unit are both disposed opposite to the second soft magnet at a distance, and the auxiliary magnet assembly is disposed opposite to the first soft magnet at a distance.

[0014] Preferably, the auxiliary magnet assembly includes a pair of auxiliary magnets disposed on one opposite side of the vibration unit and magnetized along the second direction, the pair of auxiliary magnets forming a magnetic repulsion force with the corresponding first magnet; or the auxiliary magnet assembly includes two pairs of auxiliary magnets disposed on two opposite sides of the vibration unit and magnetized along the second direction, the two pairs of auxiliary magnets forming a magnetic repulsion force with the corresponding first magnet; or the auxiliary magnet assembly is a ring magnet, the second direction being the radial direction of the ring magnet, the ring magnet forming a magnetic repulsion force with the corresponding first magnet.

[0015] Preferably, the vibration unit further includes a clamping plate with a cavity, the magnet assembly is fixed to the clamping plate and housed in the cavity, and the clamping plate is slidably connected to the guide member. Beneficial effects

[0016] The novel vibration motor of the present invention includes a housing with a receiving space, a vibration unit housed in the receiving space, a drive unit for driving the vibration unit to reciprocate along a first direction, and a guide member supporting the vibration unit. The vibration unit includes a magnet assembly arranged along the first direction, the magnet assembly including at least two magnets arranged along the first direction, each magnet being magnetized along the first direction with adjacent magnets having opposite magnetization directions. The drive unit includes a coil unit for driving the vibration unit to reciprocate. The vibration motor further includes two auxiliary magnet assemblies fixed to the housing and respectively disposed at two ends of the magnet assembly. The magnets arranged at the first and last ends are defined as first magnets. The two auxiliary magnet assemblies are arranged one-to-one with the two first magnets. Each auxiliary magnet assembly is magnetized along a second direction perpendicular to the first direction and forms a magnetic repulsion force with the corresponding first magnet. The vibration motor further includes a damping unit fixed to the housing and disposed around adjacent ends of two adjacent magnets. In the above structure, the damping unit enables the vibration unit in the vibration motor to start and stop more quickly, thereby improving the vibration effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0018] Figure 1 is a perspective view of the vibration motor of the present invention;

[0019] Figure 2 is a partial three-dimensional exploded view of the vibration motor of the present invention;

[0020] Figure 3 is a cross-sectional view of the vibration motor of the present invention along line AA in Figure 1 when the magnets of the vibratory motor of the present invention are provided with four magnets.

[0021] Figure 4 is a cross-sectional view of the vibration motor of the present invention along line AA in Figure 1 when the magnet has two magnets.

[0022] The labels in the attached diagram are as follows:

[0023] 100. Vibration motor;

[0024] 1. Shell; 10. Receiving space; 11. Top cover; 12. Bottom cover;

[0025] 2. Vibration unit; 21. Magnet assembly; 211. Magnet; 2111. First magnet; 2112. Second magnet; 2113. Third magnet; 212. Soft magnet; 2121. First soft magnet; 2122. Second soft magnet; 22. Mass block; 23. Clamping plate; 231. Cavity;

[0026] 3. Drive unit; 31. Coil unit;

[0027] 4. Guide components;

[0028] 5. Auxiliary magnet assembly; 51. Auxiliary magnet;

[0029] 6. Damping unit; 61. Damping ring; 611. Outer surface; 612. Inner surface. Embodiments of the present invention

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please refer to Figures 1-3. In this embodiment of the invention, a vibration motor 100 is provided, which includes a housing 1 having a receiving space 10, a vibration unit 2 housed in the receiving space 10, a driving unit 3 that drives the vibration unit 2 to reciprocate along a first direction, and a guide member 4 that supports the vibration unit 2. The housing 1 includes an upper cover 11 and a lower cover 12 that covers the upper cover 11.

[0032] The vibration unit 2 includes a magnet assembly 21 arranged along a first direction. The magnet assembly 21 includes at least two magnets 211 arranged along the first direction. Each magnet 211 is magnetized along the first direction and the magnetization directions of two adjacent magnets 211 are opposite. The drive unit 3 includes a coil unit 31 that drives the vibration unit 2 to reciprocate. The vibration motor 100 also includes two auxiliary magnet assemblies 5 fixed to the housing 1 and respectively arranged at the two ends of the magnet assembly 21. The magnets 211 arranged at the beginning and end are defined as first magnets 2111. The two auxiliary magnet assemblies 5 are arranged one-to-one with the two first magnets 2111. Each auxiliary magnet assembly 5 is magnetized along a second direction perpendicular to the first direction and forms a magnetic repulsion force with the corresponding first magnet 2111. The vibration motor 100 also includes a damping unit 6 fixed to the housing 1 and arranged around the adjacent ends of the two adjacent magnets 211.

[0033] Specifically, when the vibration unit 2 vibrates under the magnetic field of the coil unit 31 and the magnet assembly 21, the damping unit 6 cuts the magnetic field lines, generating local eddy currents, thereby generating a reverse electromotive force that hinders the vibration of the vibration unit 2, thus producing an electromagnetic damping effect. It can provide different damping forces depending on the magnitude of the vibration of the vibration unit 2. By setting the damping unit 6, the vibration unit 2 in the vibration motor 100 can start and stop faster, thereby improving the vibration effect.

[0034] Preferably, in this embodiment, the material of the damping unit 6 includes at least one of iron, aluminum, silver, copper and gold. Of course, in other embodiments, the material of the damping unit 6 can also be other materials with high conductivity, which is not limited here. The metal with high conductivity used in the damping unit 6 is less affected by temperature and the damping effect is more stable.

[0035] In addition, since the area around the coil unit 31 is where the electromagnetic field changes the most, when the damping unit 6 is located near the coil unit 31, a high electromagnetic damping effect can be achieved. It should be noted that the arrangement of the coil unit 31 and the damping unit 6 can be adjusted according to the number of magnets 211.

[0036] As shown in Figure 4, when there are two magnets 211, the damping unit 6 includes a damping ring 61 fixed to the housing 1 and the damping ring 61 is arranged around the adjacent ends of the two first magnets 2111. The damping ring 61 includes an outer surface 611 fixedly connected to the housing 1 and an inner surface 612 opposite to the outer surface 611. There is one coil unit 31 and the coil unit 31 is fixed to the inner surface 612.

[0037] Of course, at least three magnets 211 may be provided. The damping unit 6 includes at least one damping ring 61 fixed to the housing 1. At least one coil unit 31 is provided. At least one of the damping rings 61 and at least one of the coil units 31 are respectively arranged around the adjacent ends of two different adjacent magnets 211.

[0038] As shown in Figures 2-3, four magnets 211 are provided. The two magnets 211 arranged between the two first magnets 2111 are defined as the second magnet 2112 and the third magnet 2113. The damping unit 6 includes a damping ring 61 fixed to the housing 1 and the damping ring 61 is arranged around the adjacent ends of the second magnet 2112 and the third magnet 2113. Two coil units 31 are provided, and the two coil units 31 are arranged around the adjacent ends of the first magnet 2111 and the second magnet 2112 and the adjacent ends of the first magnet 2111 and the third magnet 2113, respectively. Of course, in some other embodiments, there is one coil unit 31 and the coil unit 31 is arranged around the adjacent ends of the second magnet 2112 and the third magnet 2113. The damping unit 6 includes two damping rings 61 and the two damping rings 61 are arranged around the adjacent ends of the first magnet 2111 and the second magnet 2112 and the adjacent ends of the first magnet 2111 and the third magnet 2113, respectively.

[0039] Preferably, as shown in Figures 2-4, the magnet assembly 21 further includes soft magnets 212 spaced apart along the first direction. The arrangement of the soft magnets 212 can enhance the magnetic field and make the driving force of the vibration motor 100 greater. The number of soft magnets 212 is one more than the number of magnets 211, and the magnets 211 are respectively arranged between two adjacent soft magnets 212.

[0040] Preferably, the vibration unit 2 further includes mass blocks 22 disposed at opposite ends of the magnet assembly 21, and the soft magnet 212 includes a first soft magnet 2121 located between the mass block 22 and the auxiliary magnet assembly 5 and a second soft magnet 2122 sandwiched between two adjacent magnets 211. The coil unit 31 and the damping unit 6 are both disposed opposite to the second soft magnet 2122 at a distance, and the auxiliary magnet assembly 5 is disposed opposite to the first soft magnet 2121 at a distance. This arrangement can maximize the utilization of the magnetic field.

[0041] Preferably, as shown in Figures 2-3, in this embodiment, each auxiliary magnet assembly 5 may also include a pair of auxiliary magnets 51 disposed on one opposite side of the vibration unit 2 and magnetized along the second direction, the pair of auxiliary magnets 51 forming a magnetic repulsion force with the corresponding first magnet 2111; it is understood that the second direction is a series of directions perpendicular to the first direction. In other embodiments, each auxiliary magnet assembly 5 includes two pairs of auxiliary magnets 51 disposed on two opposite sides of the vibration unit 2 and magnetized along the second direction, the two pairs of auxiliary magnets 51 forming a magnetic repulsion force with the corresponding first magnet 2111; or each auxiliary magnet assembly 5 may also be an annular magnet, the second direction being the radial direction of the annular magnet, the annular magnet forming a magnetic repulsion force with the corresponding first magnet 2111.

[0042] Preferably, the vibration unit 2 further includes a clamping plate 23 with a cavity 231. The magnet assembly 21 is fixed to the clamping plate 23 and housed in the cavity 231. The clamping plate 23 is slidably connected to the guide member 4. The clamping plate 23 and the guide member 4 undergo sliding friction, thereby protecting the magnet assembly 21 and preventing damage to the magnet assembly 21 during movement. It should be noted that the guide member 4 can be a sliding shaft passing through the vibration unit 2, or the guide member 4 can be a track fixed to the housing 1, etc., without limitation.

[0043] In the above structure, the damping unit 6 enables the vibration unit 2 in the vibration motor 100 to start and stop faster, thereby improving the vibration effect.

[0044] The above are merely embodiments of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A vibration motor, comprising a housing having a receiving space, a vibration unit housed within the receiving space, a drive unit for driving the vibration unit to reciprocate along a first direction, and a guide member supporting the vibration unit, characterized in that, The vibration unit includes a magnet assembly arranged along the first direction. The magnet assembly includes at least two magnets arranged along the first direction. Each magnet is magnetized along the first direction, and the magnetization directions of two adjacent magnets are opposite. The driving unit includes a coil unit that drives the vibration unit to reciprocate. The vibration motor also includes two auxiliary magnet assemblies fixed to the housing and respectively disposed at two ends of the magnet assembly. The magnets arranged at the first and last ends are defined as first magnets. The two auxiliary magnet assemblies are arranged one-to-one with the two first magnets. Each auxiliary magnet assembly is magnetized along a second direction perpendicular to the first direction and forms a magnetic repulsion force with the corresponding first magnet. The vibration motor also includes a damping unit fixed to the housing and disposed around the adjacent ends of two adjacent magnets.

2. The vibration motor according to claim 1, characterized in that: Two magnets are provided. The damping unit includes a damping ring fixed to the housing and the damping ring is arranged around the adjacent ends of the two magnets. The damping ring includes an outer surface fixedly connected to the housing and an inner surface opposite to the outer surface. One coil unit is provided and the coil unit is fixed to the inner surface.

3. The vibration motor according to claim 1, characterized in that: The magnets are provided in at least three. The damping unit includes at least one damping ring fixed to the housing. The coil unit is provided in at least one way. At least one of the damping rings and at least one of the coil units are respectively arranged around the adjacent ends of two different adjacent magnets.

4. The vibration motor according to claim 3, characterized in that: The magnets are provided in four parts. The two magnets arranged between the two first magnets are defined as the second magnet and the third magnet. The damping unit includes a damping ring fixed to the housing and the damping ring is arranged around the adjacent ends of the second magnet and the third magnet. The coil unit is provided in two parts and the two coil units are arranged around the adjacent ends of the first magnet and the second magnet and the adjacent ends of the first magnet and the third magnet, respectively.

5. The vibration motor according to claim 3, characterized in that: The number of magnets is four. The two magnets arranged between the two first magnets are defined as the second magnet and the third magnet. The coil unit is provided and is arranged around the adjacent ends of the second magnet and the third magnet. The damping unit includes two damping rings and is arranged around the adjacent ends of the first magnet and the second magnet, and the adjacent ends of the first magnet and the third magnet, respectively.

6. The vibration motor according to claim 1, characterized in that: The damping unit is made of at least one of iron, aluminum, silver, copper, and gold.

7. The vibration motor according to claim 1, characterized in that: The magnet assembly further includes soft magnets arranged at intervals along the first direction, wherein the number of soft magnets is one more than the number of magnets, and the magnets are respectively disposed between two adjacent soft magnets.

8. The vibration motor according to claim 7, characterized in that: The vibration unit further includes mass blocks disposed at opposite ends of the magnet assembly. The soft magnet includes a first soft magnet located between the mass block and the first magnet, and a second soft magnet sandwiched between two adjacent magnets. The coil unit and the damping unit are both disposed opposite to the second soft magnet at a distance. The auxiliary magnet assembly is disposed opposite to the first soft magnet at a distance.

9. The vibration motor according to claim 1, characterized in that: The auxiliary magnet assembly includes a pair of auxiliary magnets disposed on one opposite side of the vibration unit and magnetized along the second direction, the pair of auxiliary magnets forming a magnetic repulsion force with the corresponding first magnet; or the auxiliary magnet assembly includes two pairs of auxiliary magnets disposed on two opposite sides of the vibration unit and magnetized along the second direction, the two pairs of auxiliary magnets forming a magnetic repulsion force with the corresponding first magnet; or the auxiliary magnet assembly is a ring magnet, the second direction being the radial direction of the ring magnet, the ring magnet forming a magnetic repulsion force with the corresponding first magnet.

10. The vibration motor according to claim 1, characterized in that: The vibration unit also includes a clamping plate with a cavity, the magnet assembly is fixed to the clamping plate and housed in the cavity, and the clamping plate is slidably connected to the guide member.

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