CN215580858U - Linear vibration motor - Google Patents
Linear vibration motor Download PDFInfo
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- CN215580858U CN215580858U CN202121042530.4U CN202121042530U CN215580858U CN 215580858 U CN215580858 U CN 215580858U CN 202121042530 U CN202121042530 U CN 202121042530U CN 215580858 U CN215580858 U CN 215580858U
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Abstract
The utility model discloses a linear vibration motor, which comprises a shell, a vibration assembly, a stator assembly and an elastic supporting piece, wherein the vibration assembly, the stator assembly and the elastic supporting piece are accommodated in the shell; the stator component comprises an iron core and a coil wound on the outer peripheral surface of the iron core; the axial direction of the coil is along the vibration direction of the vibration component; in the direction vertical to the vibration direction of the vibration assembly, the stator assembly comprises a central line; the vibration component at least comprises two magnetic groups; the two magnetic groups are respectively positioned at two opposite sides of the stator component in the axial direction of the coil; the magnetic group includes: the magnetic conduction plate is positioned on one side of the magnet, which is far away from the stator component; the iron core and one magnet on one side of the iron core form two groups of first magnetic induction line closed loops which are symmetrically distributed relative to the central line of the stator assembly; the iron core and one magnetic conduction plate on one side of the iron core form two groups of second magnetic induction line closed loops which are symmetrically distributed relative to the central line of the stator assembly. The magnetic induction lines are distributed symmetrically, so that more magnetic induction lines penetrate through the iron core.
Description
Technical Field
The present invention relates to the field of vibration motors. And more particularly, to a linear vibration motor.
Background
With the development of communication technology, portable electronic products, such as mobile phones, handheld game consoles or handheld multimedia entertainment devices, have come into the lives of people. In these portable electronic products, a micro vibration motor is generally used for system feedback, such as incoming call prompt of a mobile phone, vibration feedback of a game machine, and the like. With the rapid development of consumer electronics, vibration motors are increasingly required to have higher vibration sense, faster take-off and landing time and larger frequency bandwidth.
The existing linear vibration motor generally comprises a shell, a vibrator system and a stator system, wherein the vibrator system and the stator system are accommodated in the shell, the vibrator system is composed of a mass block, a permanent magnet and a spring plate, the stator system is generally composed of an FPCB (field programmable logic controller) and a coil, and the vibrator system is driven by the stator system to vibrate so as to drive the motor to vibrate integrally and transmit vibration to the outside. Most of the existing linear vibration motors drive a vibrator system to vibrate back and forth through the reaction force of ampere force applied to a coil, but the linear vibration motors are limited by the space volume of the coil, the number of turns and the effective length of the coil are limited, and the ampere force is usually small, which is an important reason for the weak vibration sense of the existing motors.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, it is an object of the present invention to provide a linear vibration motor in which magnetic induction lines are distributed symmetrically throughout a magnetic circuit, so that the magnetic induction lines pass through a core and a coil more, the effective utilization rate of the magnetic induction lines is higher, and the driving force of the system is larger.
According to one aspect of the present invention, there is provided a linear vibration motor including a housing, and a vibration assembly, a stator assembly and an elastic support member which supports the vibration assembly, which are accommodated in the housing;
the stator assembly comprises an iron core and a group of coils wound on the outer peripheral surface of the iron core;
the axial direction of the coil is along the vibration direction of the vibration assembly; in the direction perpendicular to the vibration direction of the vibration assembly, the stator assembly comprises a central line;
the vibration component at least comprises two magnetic groups;
the two magnetic groups are respectively positioned at two opposite sides of the stator component in the axial direction of the coil;
the magnetic group includes: the magnetic conduction plate is positioned on one side of the magnet, which is far away from the stator component;
the iron core and one magnet on one side of the iron core form two groups of first magnetic induction line closed loops which are symmetrically distributed relative to the central line of the stator assembly;
and two groups of second magnetic induction line closed loops which are symmetrically distributed relative to the central line of the stator assembly are formed on the iron core and one magnetic conduction plate on one side of the iron core.
Preferably, the first closed loop and the second closed loop of the magnetic induction lines, which are respectively formed with the iron core, of the two magnetic groups are symmetrical relative to the axis of the iron core.
Preferably, in a vibration direction of the vibration assembly, a length of the magnetic group is greater than a length of the stator assembly.
Preferably, the magnets include two side magnets arranged in a vibration direction of the vibration assembly, and a middle magnet located between the two side magnets; the magnetizing directions of the two side magnets are parallel to the vibration direction of the vibration assembly, and the magnetizing directions are opposite;
the magnetizing direction of the middle magnet is perpendicular to the vibration direction of the vibration assembly.
Preferably, in a direction perpendicular to the vibration direction of the vibration assembly, the magnetizing directions of two corresponding side magnets in the two groups of magnets are the same, and the magnetizing directions of two corresponding middle magnets in the two groups of magnets are opposite.
Preferably, one side surface of the magnetic conduction plate close to the stator assembly is recessed inwards to form an accommodating groove, and the magnet is accommodated and fixed in the accommodating groove.
Preferably, the magnetic conducting plate includes a bottom wall portion which is attached to and fixed with a surface of the magnet on a side away from the stator assembly, and a side wall portion which extends from two end portions of the bottom wall portion to a side close to the stator assembly, and the bottom wall portion and the side wall portion enclose to form the accommodating groove; one side surface of the side wall part close to the stator component is flush with one side surface of the magnet close to the stator component.
Preferably, the iron core includes a body portion around which the coil is wound, and extension portions extending from both end portions of the body portion.
Preferably, the stator assembly further includes a magnetic conductive ring sleeved on the extension portion.
Preferably, the vibration assembly comprises a mass, the elastic support being connected to the mass; the mass block is provided with a containing hole, and the two magnetic groups are combined and fixed on two opposite side walls of the containing hole; the coil is fixed on the shell and extends into the accommodating hole.
The utility model has the following beneficial effects:
the linear vibration motor of the utility model forms a first magnetic induction line closed loop and a second magnetic induction line closed loop between the iron core and the magnet and between the iron core and the magnetic conduction plate respectively, and leads the magnetic induction lines of the whole magnetic circuit to be distributed symmetrically through the relative positions of the iron core, the magnet and the magnetic conduction plate, so that more magnetic induction lines can pass through the iron core, more magnetic induction lines can pass through the coil, the effective utilization rate of the magnetic induction lines is higher, the ampere force borne by the coil is larger, the driving force of the vibration component is larger, and the vibration induction of the motor is stronger.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows an exploded view of the present invention.
Fig. 2 shows a schematic view of the internal structure of the present invention.
Fig. 3 shows a schematic diagram of the magnetic induction lines of the present invention.
Fig. 4 shows a partial structural schematic of the present invention.
Fig. 5 shows an internal structural diagram of an embodiment of the present invention.
FIG. 6 shows a magnetic induction line schematic of one embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the utility model, the utility model is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the utility model.
Fig. 1 and 2 show a schematic structural view of the linear vibration motor of the present invention, which includes a housing, a vibrator assembly accommodated in the housing, a stator assembly, and a resilient support 40.
The housing forming the housing space in the present embodiment includes the first housing 11 and the second housing 12, and may be an upper housing and a lower housing, which are not limited in the present invention. In the housing structure provided in this embodiment, the first housing 11 is a plate-shaped structure, the second housing 12 is a cavity structure with an opening at the bottom and the top and four sides of the cavity structure are closed by bending; the first housing 11 is fixed at the bottom opening of the second housing 12, the housing structure provided by the embodiment is more convenient for assembling the stator assembly, the vibrator assembly, the elastic support 40 and the housing, the process is simple, the cost is lower, and the housing can be made of a magnetic conductive material, so that the driving force of the motor can be further improved, and the vibration sense of the motor can be improved.
Stator module includes iron core 21 and around locating coil 22 on the iron core 21 outer peripheral face, and wherein, coil 22's axis direction does the vibration direction of vibration subassembly, the vibration direction is parallel with first casing 11, with in the perpendicular direction of vibration subassembly vibration direction, stator module is including the central line.
The coil 22 is fixed to the first housing 11, and the core 21 has a columnar shape and may have a circular cross section or a cross section similar to that of the coil 22, for example, the coil 22 is a rectangular coil and the core 21 has a rectangular cross section.
In the present embodiment, when the coil 22 is energized, the iron core 21 is magnetized by the magnetic field of the coil 22, and the magnetized iron core 21 becomes a magnet whose magnetic field is superimposed with the magnetic field of the coil 22, so that the magnetic force of the stator assembly is increased.
The coil 22 is electrically connected to an external circuit through a circuit board 50, the circuit board 50 is fixed on the first housing 11, and one end of the circuit board 50 extends out of the accommodating space to be connected to the external circuit.
The vibration assembly includes at least two magnetic groups respectively located at opposite sides of the stator assembly in the axial direction of the coil 22. Each of the magnetic groups comprises a magnet 31 and a magnetic conduction plate 32 positioned on one side of the magnet 31 far away from the stator assembly.
As shown in fig. 3, two first closed loops 61 of magnetic induction lines are formed on the iron core 21 and the magnet 31 on the iron core side, which are symmetrically distributed with respect to the stator assembly center line, and two second closed loops 62 of magnetic induction lines are formed on the iron core 21 and the one magnetic conductive plate 32 on the iron core side, which are symmetrically distributed with respect to the stator assembly center line, and in fig. 3, the first closed loop 61 of magnetic induction lines and the second closed loop 62 of magnetic induction lines are respectively shown by broken lines.
According to the motor, due to the relative positions of the magnetic conduction plate 32, the magnet 31 and the iron core 21, the magnetic induction lines of the whole magnetic circuit are distributed symmetrically, more magnetic induction lines penetrate through the iron core 21, more magnetic induction lines can penetrate through the coil 22, the effective utilization rate of the magnetic induction lines is higher, the ampere force applied to the coil 22 is larger, the driving force of the vibration assembly is larger, and the vibration induction of the motor is stronger.
In addition, the motor is provided with the magnetic conduction plate 32 and the iron core 21, has the characteristic of more magnetic conduction materials, enables the magnetic induction lines in the whole structure to form a plurality of closed loops, has good magnetic shielding effect, and further greatly reduces the magnetic leakage of the structure.
In the present embodiment, the first closed loop 61 and the second closed loop 62 of the magnetic induction line formed by the two magnetic groups and the iron core 21 are symmetrical with respect to the central axis of the iron core 21. Therefore, more magnetic induction lines can penetrate through the coil 22, the effective utilization rate of the magnetic induction lines is higher, the ampere force borne by the coil 22 is larger, the driving force of the vibration assembly is larger, and the vibration induction of the motor is stronger.
Further, in the vibration direction of the vibration assembly, the length of the magnetic group is greater than that of the stator assembly, and specifically, the length of the magnetic conduction plate 32 is greater than that of the iron core 21. Therefore, when the vibration assembly reciprocates, the side suction force between the vibration assembly and the stator assembly is smaller, the vibration stability of the product is better, and the assembly process is simpler.
As shown in fig. 1 and 3, the magnet 31 of the present embodiment includes side magnets 312 arranged at both sides along the vibration direction, and a middle magnet 311 located between the side magnets 312, the two side magnets 312 have magnetization directions parallel to the vibration direction of the vibration assembly and opposite to each other, and the middle magnet 311 has a magnetization direction perpendicular to the vibration direction of the vibration assembly. The middle magnet 311 and the side magnets 312 on both sides form a Halbach array, so that the magnetic field intensity close to one side of the coil 22 is greatly improved, the effective utilization rate of the magnetic induction lines is improved, and the vibration induction of the product is improved.
In the present embodiment, in the direction perpendicular to the vibration direction of the vibration assembly, the magnetizing directions of the two corresponding side magnets 312 in the two sets of magnets 31 are the same, and the magnetizing directions of the two corresponding middle magnets 311 in the two sets of magnets 31 are opposite. For example, the N-poles of the two middle magnets 311 face the coil 22, and the N-poles of the side magnets 312 on both sides of the middle magnet 311 face the middle magnet.
As shown in fig. 4, a side surface of the magnetic conductive plate 32 close to the stator assembly is recessed inward to form a receiving groove 321, and the magnet 31 is received in the receiving groove 321. Specifically, the magnetic conductive plate 32 includes a bottom wall portion 322 attached to and fixed to a surface of the magnet 31 on a side away from the stator assembly, and a side wall portion 323 formed by extending two end portions of the bottom wall portion 322 to a side close to the stator assembly, where the bottom wall portion 322 and the side wall portions 323 on two sides thereof together form the receiving groove 321. Preferably, a side surface of the sidewall portion 323 adjacent to the stator assembly is flush with a side surface of the magnet 31 adjacent to the stator assembly.
As shown in fig. 2 and 3, the core 21 includes a body 211 around which the coil 22 is wound, and extending portions 212 extending from both ends of the body 211, that is, both ends of the core 21 are located outside the coil 22. The two end parts of the iron core 21 are respectively close to the side wall parts 323 at two sides of the magnetic conduction plate 32, so that a second closed magnetic induction line loop is formed.
As shown in fig. 1 and 2, the vibration assembly further includes a mass 33, the mass 33 has a receiving hole perpendicular to the vibration direction of the vibration assembly, the two magnetic groups are fixedly coupled to two opposite sidewall surfaces of the receiving hole, and the coil 22 is fixed to the first housing 11 and extends into the receiving hole. One end of the elastic support 40 is connected to the mass 33, and the other end is connected to the second housing 12, and the mass 33 and the magnetic assembly are suspended in the housing through the elastic support 40.
Specifically, the two opposite sides of the mass block 33 along the vibration direction are respectively provided with an elastic supporting member 40, the elastic supporting members 40 are U-shaped springs, two ends of each U-shaped spring are respectively connected with the mass block 33 and the second housing 12, and the opening directions of the U-shaped springs are opposite.
As shown in fig. 5 and fig. 6, in some embodiments, the two ends of the iron core 21 are respectively sleeved with the magnetic conductive rings 23, that is, the magnetic conductive rings 23 are sleeved on the outer side surfaces of the extending portions 212 of the iron core 21, that is, the two ends of the coil 22 are respectively abutted against the magnetic conductive rings 23.
The magnetic conductive ring 23 and the coil 22 are fixedly combined on the first housing 11, and together with the iron core 21, form a stator assembly. The low-carbon steel with lower carbon content of the magnetic conductive ring 23 is made, so that the magnetic resistance can be reduced, the first magnetic induction line closed loop 61 and the second magnetic induction line closed loop 62 respectively enter the upper side wall part 323 and the side magnet 312 of the magnetic conductive plate 32 from the magnetic conductive ring 23, the internal magnetic induction lines form a plurality of closed loops, the magnetic shielding effect is good, and the magnetic leakage of the product is greatly reduced.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. A linear vibration motor, the motor comprising a housing and a vibration assembly housed within the housing, a stator assembly and a resilient support supporting the vibration assembly; it is characterized in that the preparation method is characterized in that,
the stator assembly comprises an iron core and a group of coils wound on the outer peripheral surface of the iron core;
the axial direction of the coil is parallel to the vibration direction of the vibration assembly; in the direction perpendicular to the vibration direction of the vibration assembly, the stator assembly comprises a central line;
the vibration component at least comprises two magnetic groups;
the two magnetic groups are respectively positioned at two opposite sides of the stator component in the axial direction of the coil;
the magnetic group includes: the magnetic conduction plate is positioned on one side of the magnet, which is far away from the stator component;
the iron core and one magnet on one side of the iron core form two groups of first magnetic induction line closed loops which are symmetrically distributed relative to the central line of the stator assembly;
and two groups of second magnetic induction line closed loops which are symmetrically distributed relative to the central line of the stator assembly are formed on the iron core and one magnetic conduction plate on one side of the iron core.
2. The motor of claim 1, wherein the first closed loop and the second closed loop of the two magnetic groups, which are respectively formed with the iron core, are symmetrical with respect to the axis of the iron core.
3. The motor of claim 1, wherein the length of the magnet assembly is greater than the length of the stator assembly in a direction of vibration of the vibration assembly.
4. The motor of claim 1, wherein the magnets include two side magnets arranged in a vibration direction of the vibration assembly, and a middle magnet located between the two side magnets; the magnetizing directions of the two side magnets are parallel to the vibration direction of the vibration assembly, and the magnetizing directions are opposite;
the magnetizing direction of the middle magnet is perpendicular to the vibration direction of the vibration assembly.
5. The motor of claim 4, wherein the two corresponding side magnets of the two sets of magnets have the same magnetizing direction and the two corresponding middle magnets of the two sets of magnets have opposite magnetizing directions in a direction perpendicular to the vibration direction of the vibration assembly.
6. The motor of claim 1, wherein a side surface of the magnetic conductive plate close to the stator assembly is recessed inwards to form a receiving groove, and the magnet is received and fixed in the receiving groove.
7. The motor of claim 6, wherein the magnetic conductive plate comprises a bottom wall portion attached to a surface of the magnet on a side facing away from the stator assembly, and a side wall portion extending from two end portions of the bottom wall portion to a side close to the stator assembly, and the bottom wall portion and the side wall portion enclose the accommodating groove; one side surface of the side wall part close to the stator component is flush with one side surface of the magnet close to the stator component.
8. The motor according to claim 1, wherein the core includes a body portion around which the coil is wound, and extension portions extending from both end portions of the body portion.
9. The motor as claimed in claim 8, wherein the stator assembly further comprises a magnetic ring sleeved on the extension portion.
10. The motor of claim 1, wherein the vibration assembly includes a mass, the resilient support being connected to the mass; the mass block is provided with a containing hole, and the two magnetic groups are combined and fixed on two opposite side walls of the containing hole; the coil is fixed on the shell and extends into the accommodating hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121042530.4U CN215580858U (en) | 2021-05-14 | 2021-05-14 | Linear vibration motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121042530.4U CN215580858U (en) | 2021-05-14 | 2021-05-14 | Linear vibration motor |
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| Publication Number | Publication Date |
|---|---|
| CN215580858U true CN215580858U (en) | 2022-01-18 |
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| CN202121042530.4U Active CN215580858U (en) | 2021-05-14 | 2021-05-14 | Linear vibration motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117856564A (en) * | 2024-03-06 | 2024-04-09 | 瑞声光电科技(常州)有限公司 | Vibration motor |
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2021
- 2021-05-14 CN CN202121042530.4U patent/CN215580858U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117856564A (en) * | 2024-03-06 | 2024-04-09 | 瑞声光电科技(常州)有限公司 | Vibration motor |
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