Vibration motor

Abstract

The present invention provides a vibration motor, comprising a housing, a vibration unit, a driving unit, and a guide member supporting the vibration unit. The vibration unit comprises a magnetic steel assembly arranged in a first direction, the magnetic steel assembly comprises at least two magnetic steels arranged in the first direction, each magnetic steel is magnetized in the first direction, and magnetization directions of two adjacent magnetic steels are opposite. The driving unit comprises a coil assembly arranged around adjacent ends of two adjacent magnetic steels. 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 steels arranged at two outermost ends of the magnetic steel assembly are defined as first magnetic steels, the two auxiliary magnetic steel assemblies are arranged in one-to-one correspondence with the two first magnetic steels, and each auxiliary magnetic steel assembly is magnetized in a second direction perpendicular to the first direction and forms a magnetic repulsive force with a corresponding first magnetic steel. The vibration motor of the present invention has high reliability and a long service life.

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] Vibration motors in related technologies include a vibration unit and a drive unit. Generally, the vibration unit is held by an elastic element and provides elastic restoring force, ultimately generating reciprocating motion. However, the elastic element experiences deformation stress during motion, and the greater the stroke, the greater the stress. When the lifespan of the spring material reaches its limit, the elastic element will break, leading to the failure of the vibration system.

[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 that uses the force generated by the repulsion between like poles of magnets as a magnetic spring structure to solve the problems of small vibration and short life of traditional elastic components. Technical solutions

[0006] To achieve the above objectives, this embodiment of the invention provides a vibration motor, which 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 and adjacent magnets having opposite magnetization directions. The drive unit includes a coil assembly arranged around adjacent ends of the two adjacent magnets. 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.

[0007] Preferably, each 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 each 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 each 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.

[0008] Preferably, the guide includes two guide sleeves disposed at opposite ends of the vibration unit along the first direction, each guide sleeve having a guide channel extending therethrough, the vibration unit being housed in the guide channel and slidably connected to the guide sleeve.

[0009] Preferably, the vibration unit further includes a clamping plate sleeved inside the guide sleeve and having 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 sleeve.

[0010] Preferably, the guide sleeve is further provided with a clearance groove to avoid the edge of the clamping plate.

[0011] 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.

[0012] Preferably, the vibration unit further includes counterweights disposed at opposite ends of the magnet assembly, the soft magnet includes a first soft magnet sandwiched between the counterweight and the first magnet and a second soft magnet sandwiched between two adjacent magnets, the auxiliary magnet assembly is disposed opposite to the first soft magnet at a distance, and the coil assembly is disposed opposite to the second soft magnet at a distance.

[0013] Preferably, the counterweight includes a first part disposed outside the cavity and a second part housed inside the cavity. The first part does not contact the guide sleeve, and the clamping plate abuts against the first part. The surface of the second part connected to the clamping plate is also provided with a groove, which engages with a protrusion provided on the clamping plate.

[0014] Preferably, the soft magnet is made of a soft magnetic material, which includes at least one of carbon steel, iron-cobalt alloys, amorphous alloys, and nanocrystalline alloys. Beneficial effects

[0015] The novel vibration motor of the present invention includes 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 assembly arranged around adjacent ends of the two adjacent magnets. 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. In the above structure, the magnetic repulsion force formed by the auxiliary magnet assembly and the first magnet replaces the traditional elastic element to provide the restoring force for the vibration unit, saving the space occupied by the traditional elastic element, enabling vibration with a larger displacement, effectively improving vibration performance and vibration effect, avoiding the short service life defects caused by fatigue and other problems of traditional elastic elements, and improving reliability. Attached Figure Description

[0016] 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:

[0017] Figure 1 is a perspective view of the vibration motor of the present invention;

[0018] Figure 2 is an exploded view of the vibration motor of the present invention;

[0019] Figure 3 is an exploded three-dimensional structural diagram of the vibration motor part of the present invention;

[0020] Figure 4 is a partial three-dimensional exploded view of the vibration unit of the vibration motor of the present invention.

[0021] Figure 5 is a cross-sectional view of the vibration motor of the present invention along line AA in Figure 1;

[0022] Figure 6 is a cross-sectional view of the vibration motor of the present invention along line BB in Figure 1;

[0023] The labels in the attached diagram are as follows:

[0024] 100. Vibration motor;

[0025] 1. Shell; 10. Receiving space; 11. Top cover; 12. Bottom cover;

[0026] 2. Vibration unit; 21. Magnet assembly; 211. Magnet; 2111. First magnet; 212. Soft magnet; 2121. First soft magnet; 2122. Second soft magnet; 22. Clamping plate; 221. Cavity; 222. Upper clamping plate; 223. Lower clamping plate; 224. Protrusion; 23. Counterweight; 231. First part; 232. Second part; 2321. Groove;

[0027] 3. Drive unit; 31. Coil assembly;

[0028] 4. Guide component; 41. Guide sleeve; 411. Clearance groove; 42. Guide channel;

[0029] 5. Auxiliary magnet assembly; 51. Auxiliary magnet. 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 1-6. 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] As shown in Figures 3-5, 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 two adjacent magnets 211 are arranged with the same pole facing each other to generate a strong magnetic field, thereby increasing the driving force. The drive unit 3 includes a coil assembly 31 arranged around the adjacent ends of the two adjacent magnets 211. 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 the 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 with the corresponding first magnet 2111. It should be noted that the second direction is a series of directions perpendicular to the first direction.

[0033] In the above structure, the magnetic repulsion force formed between the auxiliary magnet assembly 5 and the first magnet 2111 is used to replace the traditional elastic element to provide the restoring force for the vibration unit 2. This saves the space occupied by the traditional elastic element, enables vibration with a larger displacement, effectively improves the vibration performance and vibration effect, avoids the short service life defects caused by fatigue and other problems of the traditional elastic element, and improves the reliability of the vibration motor.

[0034] As shown in Figures 2-3, in this embodiment, 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 form 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 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 form a magnetic repulsion force with the corresponding first magnet 2111. Alternatively, each auxiliary magnet assembly 5 may also be an annular magnet, with the second direction being the radial direction of the annular magnet. The annular magnet forms a magnetic repulsion force with the corresponding first magnet 2111.

[0035] Furthermore, as shown in Figure 3, the guide member 4 includes two guide sleeves 41 disposed at opposite ends of the vibration unit 2 along the first direction. The guide sleeves 41 are provided with guide channels 42 passing through them. The vibration unit 2 is housed in the guide channels 42 and slidably connected to the guide sleeves 41. Of course, in some other embodiments, the guide member 4 may also be a sliding shaft passing through the vibration unit 2, or the guide member 4 may also be a track fixed to the housing 1, etc., which are not limited here.

[0036] Furthermore, the vibration unit 2 also includes a clamping plate 22 sleeved inside the guide sleeve 41 and having a cavity 221. The magnet assembly 21 is fixed to the clamping plate 22 and housed in the cavity 221. The clamping plate 22 is slidably connected to the guide sleeve 41. The magnet assembly 21 is disposed in the cavity 221. When the vibration unit 2 reciprocates in the guide sleeve 41, the clamping plate 22 slides against the inner wall of the guide sleeve 41, thereby protecting the magnet assembly 21 and preventing damage to the magnet assembly 21 during movement. It should be noted that the clamping plate 22 can be integral or, as shown in this embodiment, can be formed by an upper clamping plate 222 and a lower clamping plate 223.

[0037] Furthermore, as shown in Figure 6, the guide sleeve 41 is also provided with a clearance groove 411 to avoid the edge of the clamping plate 22. The edges of the upper clamping plate 222 and the lower clamping plate 223 may have burrs, and the welding surfaces of the upper clamping plate 222 and the lower clamping plate 223 may be rough and uneven during welding. The clearance groove 411 can prevent these burrs and the rough welding surface from increasing the sliding friction resistance between the vibration unit 2 and the guide sleeve 41, thereby affecting the vibration effect of the vibration motor.

[0038] As shown in Figure 4, the magnet assembly 21 also includes soft magnets 212 spaced apart along a first direction. The number of soft magnets 212 is one more than the number of magnets 211, and the magnets 211 are respectively disposed between two adjacent soft magnets 212. The arrangement of the soft magnets 212 can enhance the magnetic field, thereby increasing the driving force of the vibration motor 100.

[0039] Furthermore, the vibration unit 2 also includes counterweights 23 disposed at opposite ends of the magnet assembly 21. The counterweights 23 can provide a greater amount of vibration. The soft magnet 212 includes a first soft magnet 2121 sandwiched between the counterweights 23 and the first magnet 2111, and a second soft magnet 2122 sandwiched between two adjacent magnets 211. The auxiliary magnet assembly 5 is positioned opposite to the first soft magnet 2121 at a distance. With this arrangement, a more stable repulsive force can be generated between the auxiliary magnet assembly 5 and the first magnet 2111. The coil assembly 31 is positioned opposite to the second soft magnet 2122 at a distance. This arrangement can maximize the utilization of the magnetic field and generate a greater driving force.

[0040] As shown in Figure 5, the counterweight 23 includes a first part 231 disposed outside the cavity 221 and a second part 232 housed inside the cavity 221. The first part 231 does not contact the guide sleeve 41, and the clamping plate 22 abuts against the first part 231. When the vibration unit 2 reciprocates in the guide sleeve 41, the first part 231 ensures that the internal magnet assembly 21 and soft magnet 212 are not deformed or displaced by the pressure of the counterweight 23, thus ensuring a good vibration effect. The surface of the second part 232 connected to the clamping plate 22 is also provided with a groove 2321. The groove 2321 engages with the protrusion 224 provided on the clamping plate 22. The engagement makes the assembly of the counterweight 23 and the clamping plate 22 more flexible and convenient. At the same time, during the vibration process, it can prevent the counterweight 23 from separating from the clamping plate 22 due to vibration inertia, thus ensuring good vibration stability.

[0041] Furthermore, the soft magnet 212 is made of a soft magnetic material, which includes at least one of carbon steel, iron-cobalt alloys, amorphous alloys and nanocrystalline alloys. Of course, other metals or alloys with high conductivity can also be used as soft magnetic materials, which are not limited here.

[0042] In this embodiment, the magnet assembly 21 is a combination of separate magnets that have been magnetized and the soft magnet that has been bonded together. Of course, in other embodiments, in order to simplify the assembly process and improve production efficiency, the magnet assembly 21 can also magnetize different areas of a whole piece of soft magnet as a whole.

[0043] Compared with related technologies, this invention utilizes the repulsive force formed between the auxiliary magnet assembly and the first magnet to replace the traditional elastic element in providing restoring force for the vibration unit. This saves the space occupied by the traditional elastic element, enables vibration with a larger displacement, effectively improves vibration performance and vibration effect, avoids the short service life defects caused by fatigue and other problems of traditional elastic elements, and improves the reliability of the vibration motor.

[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, wherein the vibration unit includes a magnet assembly disposed 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, and the drive unit including a coil assembly disposed around adjacent ends of the adjacent two magnets, characterized in that... The vibration motor further includes two auxiliary magnet components fixed to the housing and respectively disposed at two ends of the magnet assembly. The magnets arranged at the beginning and end are defined as first magnets. The two auxiliary magnet components are disposed in one-to-one correspondence with the two first magnets. Each auxiliary magnet component is magnetized along a second direction perpendicular to the first direction and forms a magnetic repulsion force with the corresponding first magnet.

2. The vibration motor according to claim 1, characterized in that: Each of the auxiliary magnet assemblies 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 each of the auxiliary magnet assemblies 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 each of the auxiliary magnet assemblies 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.

3. The vibration motor according to claim 1, characterized in that: The guide includes two guide sleeves disposed at opposite ends of the vibration unit along the first direction. Each guide sleeve has a guide channel extending through it. The vibration unit is housed in the guide channel and slidably connected to the guide sleeve.

4. The vibration motor according to claim 3, characterized in that: The vibration unit further includes a clamping plate sleeved inside the guide sleeve and having a cavity, the magnet assembly being fixed to the clamping plate and housed in the cavity, and the clamping plate being slidably connected to the guide sleeve.

5. The vibration motor according to claim 4, characterized in that: The guide sleeve is also provided with a clearance groove to avoid the edge of the clamping plate.

6. The vibration motor according to claim 4, 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.

7. The vibration motor according to claim 6, characterized in that: The vibration unit further includes counterweights disposed at opposite ends of the magnet assembly. The soft magnet includes a first soft magnet sandwiched between the counterweight and the first magnet, and a second soft magnet sandwiched between two adjacent magnets. The auxiliary magnet assembly is disposed opposite to the first soft magnet at a distance, and the coil assembly is disposed opposite to the second soft magnet at a distance.

8. The vibration motor according to claim 7, characterized in that: The counterweight includes a first part disposed outside the cavity and a second part contained inside the cavity. The first part does not contact the guide sleeve. The clamping plate abuts against the first part. The surface of the second part connected to the clamping plate is also provided with a groove. The groove engages with a protrusion provided on the clamping plate.

9. The vibration motor according to claim 6, characterized in that: The soft magnet is made of a soft magnetic material, which includes at least one of carbon steel, iron-cobalt alloys, amorphous alloys, and nanocrystalline alloys.

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