Vibration motor

Abstract

The invention provides a vibration motor. The vibration motor comprises a shell, a stator, a rotor and an elastic piece, wherein the stator and the rotor are accommodated in the shell at an interval; the elastic piece is used for elastically suspending the rotor in the shell; the stator is fixed on the shell and is used for driving the rotor to vibrate; the stator comprises a coil fixed in the shell; the rotor comprises two first magnetic steels distributed on two opposite sides of the coil and second magnetic steels located on the same side of the two first magnetic steels; the first magnetic steel is provided with a first magnetic area, the second magnetic steel is provided with a second magnetic area adjacent to the first magnetic area, and the magnetic pole, close to one side of the coil, of the first magnetic area is the same as the magnetic pole, close to one side of the coil, of the second magnetic area. According to the vibration motor, the magnetic field utilization rate of the magnetic steel is improved, and the driving force of the stator for driving the rotor to vibrate is also improved.

Description

Technical Field

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

[0002] A vibration motor is a machine that converts other forms of energy into mechanical vibration. It is mainly used to provide vibration effects for devices that require vibration, such as game consoles, mobile phones, and tablets.

[0003] A vibration motor mainly includes a housing, a stator, a mover, and an elastic element that elastically suspends the mover within the housing; wherein, the stator is fixedly connected to the housing to drive the mover to generate vibration.

[0004] The housing in the related technology includes a base plate and a cover on the base plate. The stator mainly includes coils. Some stators also have an iron core and the coils are wound around the outer periphery of the iron core. The mover includes two magnets that are spaced apart from each other and located on opposite sides of the coils. The two magnets are spaced apart from the coils so that the mover can vibrate. This method of designing magnets on opposite sides of the coils only provides two usable magnetic fields, and the magnetic fields are divergent. This results in a low utilization rate of the magnetic field of the magnets, and the driving force of the stator to drive the mover to vibrate is also reduced.

[0005] Therefore, it is necessary to provide a new vibration motor to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a new type of vibration motor to solve the problem that the magnetic field utilization rate of the magnets is low when magnets are designed on opposite sides of the coil in vibration motors in related technologies.

[0007] The present invention provides a vibration motor, comprising a housing, a stator and a mover spaced apart within the housing, and an elastic element that elastically suspends the mover within the housing; the stator is fixed to the housing and is used to drive the mover to vibrate along a first direction; The stator includes a coil fixed within the housing; the mover includes two first magnets distributed on opposite sides of the coil and a second magnet located on the same side of the two first magnets, the two first magnets and the second magnet are spaced apart along the winding direction of the coil and are all spaced apart from the stator; the magnetization direction of the first magnet is a second direction perpendicular to the first direction, and the magnetization direction of the second magnet is a third direction, the third direction being perpendicular to both the first direction and the second direction; the first magnet has a first magnetic region, and the second magnet has a second magnetic region adjacent to the first magnetic region, the magnetic poles of the first magnetic region near the coil and the magnetic poles of the second magnetic region near the coil are the same magnetic poles; the stator extends at least partially between the two first magnets.

[0008] Preferably, the second magnet is a unipolar magnet, and the second magnet has a second magnetic region; The first magnet is a unipolar magnet, and the first magnet has one first magnetic region; or, The first magnet is a multi-pole magnet. The first magnet has a plurality of first magnetic regions arranged at intervals along the first direction. One of the first magnetic regions is adjacent to the second magnetic region. The magnetic poles on the same side of two adjacent first magnetic regions are opposite magnetic poles.

[0009] Preferably, the first magnet is a tripolar magnet, and the first magnet has three first magnetic regions, with the middle first magnetic region adjacent to the second magnetic region.

[0010] Preferably, both the first magnet and the second magnet are multipole magnets; the first magnet has a plurality of first magnetic regions arranged at intervals along the first direction, and the magnetic poles on the same side of two adjacent first magnetic regions are opposite magnetic poles; the second magnet has a plurality of second magnetic regions arranged at intervals along the first direction, and the magnetic poles on the same side of two adjacent second magnetic regions are opposite magnetic poles; the number of first magnetic regions is equal to or greater than the number of second magnetic regions, and each second magnetic region is adjacent to one first magnetic region.

[0011] Preferably, the first magnet is a tripolar magnet having three first magnetic regions; the second magnet is a tripolar magnet having three second magnetic regions.

[0012] Preferably, the first magnet is an integral magnet structure or a multi-segment magnet structure having multiple first magnetic regions; the second magnet is an integral magnet structure or a multi-segment magnet structure having multiple second magnetic regions.

[0013] Preferably, each of the first magnets includes sub-magnets and pole cores stacked sequentially along the second direction, wherein the sub-magnets are closer to the coil than the pole cores.

[0014] Preferably, the vibration motor further includes welding plates fixed to two opposite inner sides of the housing along the second direction.

[0015] Preferably, the stator further includes an iron core fixed inside the housing; the coil is wound around the outer periphery of the iron core and spaced apart from the housing.

[0016] Preferably, the mover further includes a mass block, the mass block having an inwardly recessed receiving groove on the side near the stator; the stator at least partially extends into the receiving groove and is spaced apart from the mass block, the first magnet and the second magnet are respectively fixed in the receiving groove; the elastic member elastically suspends the mass block within the housing.

[0017] Compared with related technologies, the vibration motor of the present invention provides two first magnets and one second magnet on three adjacent sides of the coil, defines the magnetization direction of the first and second magnets, and defines the magnetic poles of the first magnetic region near the coil and the magnetic poles of the second magnetic region near the coil as the same magnetic pole. At the same time, the stator extends at least partially between the two first magnets, so that the magnetic steel structure has a magnetic field available on three sides and the magnetic field is concentrated in the coil. This not only improves the magnetic field utilization rate of the magnetic steel structure, but also increases the driving force of the stator to drive the vibration of the mover. Attached Figure Description

[0018] 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: Figure 1 A three-dimensional structural schematic diagram of the first type of vibration motor provided in an embodiment of the present invention; Figure 2 This is a partial exploded view of the structure of the first type of vibration motor provided in an embodiment of the present invention; Figure 3 For along Figure 1 Cross-sectional view of line AA in the middle; Figure 4 This is a planar schematic diagram of the first type of vibration motor provided in this embodiment of the invention after removing the base plate, coil, iron core, and flexible circuit board; Figure 5A schematic diagram of the magnetic poles of the first magnet and the second magnet in the first type of vibration motor provided in the embodiments of the present invention; Figure 6 This is a magnetic field cloud diagram of a vibration motor in related technologies; Figure 7 A magnetic field cloud diagram of a first type of vibration motor provided in an embodiment of the present invention; Figure 8 This is a partial exploded view of the structure of the second type of vibration motor provided in an embodiment of the present invention. Figure 9 A schematic diagram of the magnetic poles of a first magnet and a second magnet in one of the second types of vibration motors provided in an embodiment of the present invention; Figure 10 A schematic diagram of the magnetic poles of another first magnet and a second magnet in a second type of vibration motor provided in an embodiment of the present invention.

[0019] Among them, 100 is the vibration motor; 1 is the housing; 11 is the base plate; 12 is the top cover; 13 is the receiving space; 2 is the stator; 21 is the coil; 22 is the iron core; 3 is the mover; 31 is the first magnet; 310 is the first magnetic zone; 311 is the sub-magnet; 312 is the pole core; 32 is the second magnet; 320 is the second magnetic zone; 33 is the mass block; 331 is the receiving groove; 4 is the elastic element; 41 is the first fixed arm; 42 is the second fixed arm; 43 is the elastic arm; 5 is the elastic shock absorber; 6 is the flexible circuit board; and 7 is the solder sheet. Detailed Implementation

[0020] 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 them. 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.

[0021] Example 1 This invention provides a vibration motor 100, combined with... Figures 1 to 5 As shown, it includes a housing 1, a stator 2 and a mover 3 spaced apart and housed within the housing 1, and an elastic member 4 that elastically suspends the mover 3 within the housing 1; the stator 2 is fixed to the housing 1 and is used to drive the mover 3 to vibrate along a first direction.

[0022] The housing 1 includes a base plate 11 and an upper cover 12 that covers the base plate 11 and together with the base plate 11 forms an accommodating space 13; the stator 2, the mover 3 and the elastic element 4 are all housed in the accommodating space 13, the coil 21 is fixed to the base plate 11, and the elastic element 4 is fixed to the opposite sides of the upper cover 12.

[0023] The stator 2 is rectangular and includes a coil 21 fixed inside the housing 1.

[0024] The mover 3 includes two first magnets 31 distributed on opposite sides of the coil 21 and a second magnet 32 ​​located on the same side of the two first magnets 31. The two first magnets 31 and the second magnet 32 ​​are arranged at intervals along the winding direction of the coil 21 and are all spaced apart from the stator 2.

[0025] The magnetization direction of the first magnet 31 is a second direction perpendicular to the first direction, and the magnetization direction of the second magnet 32 ​​is a third direction, which is perpendicular to both the first and second directions. Figure 2 As shown, the first direction is the X-axis, the second direction is the Y-axis, and the third direction is the Z-axis.

[0026] like Figure 5 As shown, the first magnet 31 has a first magnetic region 310, and the second magnet 32 ​​has a second magnetic region 320 adjacent to the first magnetic region 310. The magnetic poles of the first magnetic region 310 and the second magnetic region 320 near the coil 21 are the same, that is, the magnetic poles of each first magnetic region 310 and each adjacent second magnetic region 320 near the coil 21 are either both N poles or both S poles. The stator 2 extends at least partially between the two first magnets 31. A magnetic region is the area or magnetic field region formed by the N poles and S poles on both sides of the same position of the magnet.

[0027] Both the first magnet 31 and the second magnet 32 ​​are multipole magnets; the first magnet 31 has a plurality of first magnetic regions 310 arranged at intervals along a first direction, and the magnetic poles on the same side of two adjacent first magnetic regions 310 are opposite magnetic poles; the second magnet 32 ​​has a plurality of second magnetic regions 320 arranged at intervals along the first direction, and the magnetic poles on the same side of two adjacent second magnetic regions 320 are opposite magnetic poles; the number of first magnetic regions 310 is equal to or greater than the number of second magnetic regions 320, and each second magnetic region 320 is adjacent to a first magnetic region 310.

[0028] Multipole magnets are magnets with multiple identical N poles and S poles, or magnets with multiple magnetic regions.

[0029] At this time, the first magnet 31 is an integral magnet structure or a multi-segment magnet structure with multiple first magnetic regions 310, that is, it has a multi-segment magnetization function; the second magnet 32 ​​is an integral magnet structure or a multi-segment magnet structure with multiple second magnetic regions 320, that is, it has a multi-segment magnetization function.

[0030] In this embodiment, the first magnet 31 is a tripolar magnet with three first magnetic regions 310; the second magnet 32 ​​is a tripolar magnet with three second magnetic regions 320.

[0031] The two first magnets 31 are positioned facing each other.

[0032] Each first magnet 31 includes sub-magnets 311 and pole cores 312 stacked sequentially along a second direction. The sub-magnets 311 are closer to the coil 21 than the pole cores 312. That is, any first magnet 31 includes sub-magnets 311 and pole cores 312 stacked sequentially along a vibration direction perpendicular to the mover 3. This design can enhance the magnetic field of the first magnet 31 through the sub-magnets 311 and pole cores 312. Of course, depending on actual needs, the first magnet 31 can also adopt an integral magnet structure without pole cores 312.

[0033] Each of the first magnet 31 and the second magnet 32 ​​has a magnetically conductive material at its end, which will cause more magnetic field lines to circulate at the ends of the first magnet 31 and the second magnet 32, resulting in a stronger magnetic field than other places.

[0034] The stator 2 also includes an iron core 22 fixed to the base plate 11 of the housing 1; the coil 21 is wound around the outer periphery of the iron core 22 and spaced apart from the housing 1, and the iron core 22 is fixed to the base plate 11 of the housing 1.

[0035] The mover 3 also includes a mass block 33, which has an inwardly recessed receiving groove 331 on the side near the stator 2. The stator 2 extends at least partially into the receiving groove 331 and is spaced apart from the mass block 33. The first magnet 31 and the second magnet 32 ​​are respectively fixed in the receiving groove 331. The elastic member 4 elastically suspends the mass block 33 on the upper cover 12 of the housing 1. This design not only improves the vibration effect of the mover 3 by the weight of the mass block 33, but also reduces the overall size of the vibration motor 100 by the design of the receiving groove 331.

[0036] The mass block 33 is rectangular; the elastic element 4 includes two elements, which are fixed to opposite sides of the mass block 33 along the vibration direction of the mover 3, and together they elastically suspend the first magnet 31 and the second magnet 32 ​​in the upper cover 12 of the housing 1; each elastic element 4 includes a first fixed arm 41 fixed to one side of the housing 1, a second fixed arm 42 fixed to the side of the mass block 33 away from the first fixed arm 41, and a spring arm 43 that bends and extends from the first fixed arm 41 toward the second fixed arm 42 and forms a fixed connection with the second fixed arm 42; the two elastic elements 4 are arranged centrally symmetrically. This design allows the elastic elements 4 to more stably suspend the mover 3 in the housing 1.

[0037] like Figure 4 As shown, the vibration motor 100 also includes welding plates 7 fixed to the two opposite inner sides of the upper cover 12 of the housing 1 along the second direction. This design can thicken or raise this part of the housing 1 to prevent the mover 3 from colliding with the housing 1 and rotating during a fall. Each welding plate 7 is spaced apart and directly opposite the second fixed arm 42.

[0038] The vibration motor 100 also includes an elastic damping element 5 fixed between the spring arm 43 and the mass block 33; the elastic damping element 5 includes two elements and is distributed at intervals on opposite sides of the mass block 33 along the vibration direction perpendicular to the mover 3; the elastic damping element 5 can be any one of foam, spring, and spring sheet. This design prevents the mover 3 from directly impacting the housing 1 during vibration, thus avoiding the possibility of damage to the vibration motor 100.

[0039] The vibration motor 100 also includes a flexible circuit board 6 fixed inside the housing 1 and extending outside the housing 1; the coil 21 is electrically connected to the flexible circuit board 6, and the flexible circuit board 6 is fixed to the base plate 11 of the housing 1.

[0040] like Figure 6 As shown, the related technology uses magnets designed on opposite sides of the coil, which only provides a usable magnetic field on two sides, and the magnetic field is divergent and escapes from the sides, resulting in low magnetic field utilization of the magnets; for example... Figure 7 As shown, the vibration motor 100 in this embodiment not only designs first magnets 31 on both sides of the coil 21, but also designs a second magnet 32 ​​on the side directly opposite the fixed surface of the coil 21. At the same time, the magnetic poles of the first magnetic region 310 near the coil 21 and the magnetic poles of the second magnetic region 320 near the coil 21 are the same. In this way, the magnetic field can be concentrated at the position of the coil 21, thereby improving the magnetic field utilization rate of the magnet structure.

[0041] Compared with related technologies, the vibration motor 100 in this embodiment provides two first magnets 31 and one second magnet 32 ​​on three adjacent sides of the coil 21, defines the magnetization direction of the first magnets 31 and the second magnets 32, and defines the magnetic poles of the first magnetic region 310 near the coil 21 and the magnetic poles of the second magnetic region 320 near the coil 21 as having the same magnetic poles. At the same time, the stator 2 extends at least partially between the two first magnets 31, so that the magnet structure can have a magnetic field available on three sides and the magnetic field is concentrated in the coil 21. This not only improves the magnetic field utilization rate of the magnet structure, but also increases the driving force of the stator 2 to drive the vibrator 3 to vibrate.

[0042] Example 2 Unlike Example 1, in combination Figure 8 and Figure 9 As shown, the second magnet 32 ​​is a unipolar magnet and has a second magnetic region 320; the first magnet 31 is a multipolar magnet and has a plurality of first magnetic regions 310 arranged at intervals along a first direction, wherein one of the first magnetic regions 310 is adjacent to the second magnetic region 320, and the magnetic poles on the same side of the two adjacent first magnetic regions 310 are opposite magnetic poles.

[0043] Of course, depending on actual needs, such as Figure 10As shown, the first magnet 31 can also be a single-pole magnet. In this case, the first magnet 31 has a first magnetic region 310.

[0044] The technical effects achieved in this embodiment are the same as those achieved in Embodiment 1, and will not be described again here.

[0045] 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, a stator and a mover spaced apart and housed within the housing, and an elastic element elastically suspending the mover within the housing; the stator is fixed to the housing and used to drive the mover to vibrate along a first direction; characterized in that, The stator includes a coil fixed within the housing; the mover includes two first magnets distributed on opposite sides of the coil and a second magnet located on the same side of the two first magnets, the two first magnets and the second magnet are spaced apart along the winding direction of the coil and are all spaced apart from the stator; the magnetization direction of the first magnet is a second direction perpendicular to the first direction, and the magnetization direction of the second magnet is a third direction, the third direction being perpendicular to both the first direction and the second direction; the first magnet has a first magnetic region, and the second magnet has a second magnetic region adjacent to the first magnetic region, the magnetic poles of the first magnetic region near the coil and the magnetic poles of the second magnetic region near the coil are the same magnetic poles; the stator extends at least partially between the two first magnets.

2. The vibration motor as described in claim 1, characterized in that, The second magnet is a unipolar magnet, and the second magnet has a second magnetic region; The first magnet is a unipolar magnet, and the first magnet has one first magnetic region; or, The first magnet is a multi-pole magnet. The first magnet has a plurality of first magnetic regions arranged at intervals along the first direction. One of the first magnetic regions is adjacent to the second magnetic region. The magnetic poles on the same side of two adjacent first magnetic regions are opposite magnetic poles.

3. The vibration motor as described in claim 2, characterized in that, The first magnet is a tripolar magnet, and the first magnet has three first magnetic regions, with the middle first magnetic region adjacent to the second magnetic region.

4. The vibration motor as described in claim 1, characterized in that, Both the first magnet and the second magnet are multipole magnets; the first magnet has a plurality of first magnetic regions arranged at intervals along the first direction, and the magnetic poles on the same side of two adjacent first magnetic regions are opposite magnetic poles; the second magnet has a plurality of second magnetic regions arranged at intervals along the first direction, and the magnetic poles on the same side of two adjacent second magnetic regions are opposite magnetic poles; the number of first magnetic regions is equal to or greater than the number of second magnetic regions, and each second magnetic region is adjacent to one first magnetic region.

5. The vibration motor as described in claim 4, characterized in that, The first magnet is a tripolar magnet, and the first magnet has three first magnetic regions; the second magnet is a tripolar magnet, and the second magnet has three second magnetic regions.

6. The vibration motor as described in claim 4, characterized in that, The first magnet is an integral magnet structure or a multi-segment magnet structure with multiple first magnetic regions; the second magnet is an integral magnet structure or a multi-segment magnet structure with multiple second magnetic regions.

7. The vibration motor as described in claim 1, characterized in that, Each of the first magnets includes a sub-magnet and a pole core stacked sequentially along the second direction, wherein the sub-magnet is closer to the coil than the pole core.

8. The vibration motor as described in claim 1, characterized in that, The vibration motor also includes welding plates that are fixed to the opposite inner sides of the housing along the second direction.

9. The vibration motor as described in claim 1, characterized in that, The stator also includes an iron core fixed inside the housing; the coil is wound around the outer periphery of the iron core and spaced apart from the housing.

10. The vibration motor as described in claim 1, characterized in that, The mover also includes a mass block, and the mass block has an inwardly recessed receiving groove on the side near the stator; the stator extends at least partially into the receiving groove and is spaced apart from the mass block, and the first magnet and the second magnet are respectively fixed in the receiving groove; the elastic member elastically suspends the mass block in the housing.

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