CN106911242B - Linear vibration motor - Google Patents
Linear vibration motor Download PDFInfo
- Publication number
- CN106911242B CN106911242B CN201710293567.6A CN201710293567A CN106911242B CN 106911242 B CN106911242 B CN 106911242B CN 201710293567 A CN201710293567 A CN 201710293567A CN 106911242 B CN106911242 B CN 106911242B
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- Prior art keywords
- permanent magnet
- mass block
- vibration motor
- linear vibration
- mass
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
- H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/02—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
Abstract
The invention provides a linear vibration motor, which comprises a shell and a vibration system accommodated in the shell; wherein the vibration system comprises a mass block and a permanent magnet fixed in the mass block; the center of mass of the permanent magnet is not coincident with the center of mass of the vibration system. The invention can reduce the occupied space of the permanent magnet to the mass block, increase the quality of a vibration system and improve the vibration feeling of products.
Description
Technical Field
The invention relates to the technical field of portable electronic products, in particular to a linear vibration motor with permanent magnets asymmetrically arranged.
Background
With the development of communication technology, portable electronic products, such as mobile phones, palm game machines or palm multimedia entertainment devices, are entering into the lives of people. In these portable electronic products, a micro vibration motor is generally used for system feedback, such as call prompt of a mobile phone, vibration feedback of a game machine, and the like. However, along with the trend of thinning electronic products, various components inside the electronic products are required to adapt to the trend, and the micro vibration motor is no exception.
The conventional micro vibration motor generally comprises an upper cover, a lower cover forming a vibration space with the upper cover, a vibrator (comprising a mass block and a permanent magnet) which can do linear reciprocating vibration in the vibration space, an elastic support piece which is connected with the upper cover and enables the vibrator to do reciprocating vibration, and a coil which is positioned below the vibrator for a certain distance.
At present, the positions of the permanent magnets are symmetrically distributed relative to the long axis or the short axis of the mass block in a plane perpendicular to the vibration direction, so that the magnets or coils are required to be even, more space of the mass block is occupied, the mass of the vibrator is reduced, the resonance frequency of the motor is increased, and the vibration sense is not strong enough.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a linear vibration motor, so as to solve the problems of high resonant frequency and low vibration feeling of the motor caused by a symmetrical permanent magnet distribution structure of the linear vibration motor and a large occupied space.
The invention provides a linear vibration motor, which comprises a shell and a vibration system accommodated in the shell; wherein the vibration system comprises a mass block and a permanent magnet fixed in the mass block; the center of mass of the permanent magnet is not coincident with the center of mass of the vibration system.
In addition, it is preferable that the permanent magnet is embedded in one side of the mass in the major axis or minor axis direction.
Furthermore, the preferred structure also comprises a stator system; the stator system comprises stator coils which are arranged corresponding to the permanent magnets in position; the magnetizing direction of the permanent magnet is vertical magnetizing; the axial direction of the stator coil is perpendicular to the magnetizing direction of the permanent magnet.
In addition, the preferred structure is that the stator system further comprises a flexible circuit board fixed on the housing; the stator coil is in conduction with the flexible circuit board.
In addition, the shell comprises an upper shell and a lower shell which are connected in an adapting way, a supporting plate which extends out is arranged on the lower shell, and the flexible circuit board is buckled or stuck and fixed on the supporting plate.
In addition, the permanent magnets are preferably distributed asymmetrically in the mass.
In addition, the permanent magnets are preferably asymmetrically distributed in the X-axis direction and/or the Y-axis direction and/or the Z-axis direction of the mass.
In addition, it is preferable that damping members are provided on the upper and lower end surfaces of the mass block and the permanent magnet close to the housing, respectively.
In addition, it is preferable that an elastic support member for suspending the mass support in the housing is welded between the mass and the housing.
In addition, it is preferable that a corresponding Hua Siban is attached to one side or both sides of the permanent magnet.
By using the linear vibration motor, the permanent magnets are distributed on one side of the long axis or the short axis of the plane perpendicular to the vibration direction of the mass block and fixed on the mass block or the shell, the stator coils are correspondingly arranged with the permanent magnets, the permanent magnets are arranged into an asymmetric structure, the occupation of the space of the mass block can be reduced, the mass of a vibration system is increased, the resonance frequency of the linear vibration motor is reduced, and the vibration sense of a product is improved.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Furthermore, the invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and attainments together with a more complete understanding of the invention will become apparent and appreciated by referring to the following description taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is an exploded view of a linear vibration motor according to a first embodiment of the present invention;
fig. 2 is a cross-sectional view of a linear vibration motor according to a first embodiment of the present invention;
fig. 2-1 is a schematic diagram showing a permanent magnet distribution structure according to a first embodiment of the present invention:
FIG. 2-2 is a schematic diagram showing a permanent magnet distribution structure according to a first embodiment of the present invention;
FIGS. 2-3 are schematic diagrams showing a third permanent magnet distribution structure according to a first embodiment of the present invention;
FIGS. 2-4 are schematic diagrams showing a permanent magnet distribution structure according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a linear vibration motor according to a first embodiment of the present invention;
fig. 4-1 is a cross-sectional view of a linear vibration motor according to a second embodiment of the present invention;
fig. 4-2 is a schematic diagram of a linear vibration motor according to a second embodiment of the present invention;
fig. 5-1 is a cross-sectional view of a linear vibration motor according to a third embodiment of the present invention;
fig. 5-2 is a cross-sectional view of a linear vibration motor according to a third embodiment of the present invention'
Fig. 5 to 3 are schematic diagrams of a linear vibration motor according to a third embodiment of the present invention.
Wherein reference numerals include: upper shell 1, damping element 2, 2', permanent magnet 3, 3', 3", stator coil 4, 4', 4", flexible circuit board 5, lower shell 6, 6', elastic support element 7, 7', 7", mass 8, 8', 8".
The same reference numerals will be used throughout the drawings to refer to similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
The term "mass" as used in the following description of the embodiments may also be referred to as "balancing weight", and refers to a high-mass, high-density metal mass that is fixed to a vibrating mass that generates vibration to enhance vibration balance. In addition, the invention is mainly used for improvement of micro-vibration motors, but the application of the technology in the invention to large-scale vibration motors is not excluded. However, for convenience of description, in the following description of the embodiments, the meaning of "linear vibration motor" and "micro vibration motor" is the same.
The linear vibration motor comprises a shell and a vibration system accommodated in the shell; the vibration system comprises a mass block and a permanent magnet fixed in the mass block; the center of mass of the permanent magnet is not coincident with the center of mass of the vibration system. The mass center of the permanent magnet refers to the common mass center of the permanent magnet fixed in the mass block, and the mass center is not coincident with the common mass center of the mass block and the permanent magnet.
In addition, the linear vibration motor further includes a stator system accommodated in the housing, the stator system including stator coils provided corresponding to positions of the permanent magnets. In other words, the linear vibration motor of the embodiment of the present invention includes a housing, a vibration system and a stator system accommodated in the housing; the vibration system comprises a mass block and permanent magnets, the stator system comprises stator coils which are arranged corresponding to the permanent magnets in position, and the permanent magnets are asymmetrically distributed in the mass block; the stator coils/permanent magnets are fixed on the housing, the corresponding permanent magnets/stator coils are fixed in the mass block, i.e. one of the stator coils or the permanent magnets is fixed on the housing, and the other part is fixed on the mass block, and the mass block reciprocates.
Specifically, the stator coil and the permanent magnet are correspondingly arranged, when the stator coil is fixed on the shell and the permanent magnet is fixed in the mass block, the permanent magnet is embedded at one side of the major axis or the minor axis of the mass block, and the positions of the permanent magnet are asymmetrically distributed in a plane perpendicular to the vibration direction of the linear vibration motor; alternatively, when the stator coil is fixed to the mass and the permanent magnet is fixed in the housing, the stator coil may be fixed to one side in the major axis or minor axis direction of the mass. The long axis direction of the mass block is in the same horizontal plane, and the maximum dimension of the mass block along the X axis or the Y axis direction is generally the X axis direction or the length direction of the mass block; correspondingly, the short axis direction of the mass block is in the same horizontal plane, and the minimum dimension of the mass block along the X axis or the Y axis direction is generally the Y axis direction or the width direction of the mass block, and the structure of the mass block shown in the attached drawings can be referred to specifically.
In order to describe the structure of the linear vibration motor of the embodiment of the present invention in detail, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 and 2 show an exploded structure and a sectional view structure of a linear vibration motor according to a first embodiment of the present invention, respectively.
As shown in fig. 1 and 2 together, in this embodiment, the linear vibration motor includes a housing, a vibration system accommodated in the housing, the vibration system including a mass block 8 and a permanent magnet 3 embedded at one end of the mass block 8 in the long axis direction, and a stator system including a stator coil 4 vertically fixed on an inner side wall of the housing and a flexible circuit board (FPCB, flexible Printed Circuit Board) 5 laterally fixed on the housing, the stator coil 4 being in welding conduction with the flexible circuit board 5, connection of an internal and external circuit of the linear vibration motor being achieved through the flexible circuit board 5.
Wherein, be provided with the accepting groove with permanent magnet 3 looks adaptation in one side of the major axis direction of quality piece 8, permanent magnet 3 can paste or welded fastening in the accepting groove of quality piece 8, and the magnetization direction of permanent magnet 3 is vertical magnetization, and stator coil 4 then fixes on the casing of quality piece 8 corresponding permanent magnet 3 one end, and the axis direction of stator coil 4 is perpendicular with the magnetization direction of permanent magnet 3. The axial direction of the stator coil 4 is the direction of the central axis of the columnar body formed by the designated sub-coil 4, which is perpendicular to the vibration direction of the mass 8.
In a specific embodiment of the present invention, elastic supporting members 7 are welded and fixed between the upper and lower end surfaces of the mass block 8 and the housing, respectively, and the elastic supporting members 7 are used for supporting and suspending the mass block 8 in the housing and providing elastic restoring force for the movement of the mass block 8.
In another embodiment of the present invention, corresponding Hua Siban (not shown in the figure) may be attached to one side or two sides of the permanent magnet, the placement position of the washer may be deformed according to the placement position of the permanent magnet in the mass block, the washer may be attached to one side, two sides or multiple sides of the permanent magnet where the mass block contacts, and the magnetic field generated by the permanent magnet is enhanced through Hua Siban, so as to gather the number of magnetic lines of force passing through the stator coil, enhance the vibration feeling of the linear vibration motor, and improve the user experience.
It should be noted that, in the embodiment of the present invention, the permanent magnets are asymmetrically distributed in a plane perpendicular to the vibration direction of the linear vibration motor, which may be understood that the permanent magnets may be asymmetrically distributed in the X-axis direction, the Y-axis direction, or the Z-axis direction of the mass, that is, the permanent magnets may be asymmetrically distributed in the X-axis direction and/or the Y-axis direction and/or the Z-axis direction of the mass; of course, the permanent magnets may be symmetrically distributed in a plane perpendicular to the vibration direction of the linear vibration motor. A linear vibration motor structure in which permanent magnets are asymmetrically or symmetrically distributed will be exemplified with reference to the accompanying drawings.
In the transverse cross-sectional structure of the linear vibration motor shown in fig. 2-1, the permanent magnets 3 are symmetrically distributed with respect to the X-axis of the mass block 8, asymmetrically distributed with respect to the Y-axis of the mass block 8, and the stator coils 4 are correspondingly arranged according to the permanent magnets; in the cross-sectional structure of the transverse linear vibration motor shown in fig. 2-2, the permanent magnets 3 are asymmetrically distributed with respect to both the X-axis and Y-axis directions of the mass block 8; in the longitudinal sectional structure of the linear vibration motor shown in fig. 2 to 3, the permanent magnets 3 are asymmetrically distributed with respect to the Z-axis direction of the mass 8, and fig. 2 to 4 show the transverse sectional structure of the linear vibration motor of fig. 2 to 3.
It will be appreciated that various modifications may be made to the permanent magnet structure of the embodiments of the present invention without departing from the scope of the invention, and are not specifically set forth herein.
Specifically, fig. 3 shows the principle of a linear vibration motor according to the first embodiment of the present invention.
As shown in fig. 1 to 3 together, the permanent magnet 3 is asymmetrically arranged at one side of the mass block 8, the stator coil 4 is arranged in parallel with the permanent magnet 3, after two currents with opposite directions are introduced into the stator coil 4, the left hand is stretched out according to the left hand rule for judging the stress direction of the energized conductor in the magnetic field, so that the thumb is perpendicular to the other four fingers and is in the same plane with the palm; the magnetic induction line enters from the palm center, and the four fingers point to the current direction, and the direction pointed by the thumb is the direction of ampere force applied by the electrified conducting wire in the magnetic field.
As shown in FIG. 3, the direction of the current indicated as "" is oriented vertically outward and indicated asThe current direction is oriented in the vertical plane, assuming that the energizing direction of the stator coil 4 is up +.>In the following "", according to the left hand rule, the force bearing direction of the stator coil 4 in the magnetic field is downward F ', because the stator coil 4 is fixed on the shell and can not move, based on the relation between the acting force and the reacting force, the force bearing direction of the permanent magnet 3 is upward F, and the directions of F and F' are the same and opposite. Thus, the permanent magnet 3 which is pushed upwards drives the mass block 8 to act togetherThe upper translational movement, thereby pressing the elastic support on the upper side of the mass 8 and stretching the elastic support on the lower side of the mass 8.
Similarly, when the direction of the current in the stator coil 4 is changed, the direction of the magnetic field force F' applied to the stator coil 4 is upward according to the left-hand rule. However, since the stator coil 4 is fixed, the permanent magnet 3 receives the force of F which is opposite to the direction of F' and has the same magnitude, and the permanent magnet 3 receiving the downward pushing force drives the mass block 8 to perform downward translational movement together, and simultaneously, the elastic supporting members 7 at both sides of the mass block 8 are continuously stretched/extruded after being restored from the extruded/stretched state. The above movements are alternated to reciprocate the vibrating system in a direction parallel to the mounting plane of the stator system.
In order to prevent the mass block 8 or the permanent magnet 3 from colliding with the inner wall of the housing during the movement of the linear vibration motor, in another embodiment of the present invention, damping members 2 are respectively adhered and fixed to the upper and lower end surfaces of the mass block 8 and the permanent magnet 3 near the side of the housing; wherein, the damping piece 2 can be a member with elastic restoring force such as foam piece, rubber piece or silica gel piece; the position of the damper 2 can be adjusted according to the change in the direction of movement of the mass 8.
In order to enhance the vibration sense of the linear vibration motor and the vibration balance of the mass block 8, the mass block 8 may be made of a high-density metal material such as a tungsten steel block, a nickel steel block or a nickel tungsten alloy, etc., so that the vibration force of the mass block is increased, and the vibration of the electronic product is stronger.
In addition, in the linear vibration motor provided by the invention, the shell can further comprise an upper shell 1 and a lower shell 6 which are connected in an adaptive manner, the upper shell 1 is of an unsealed cuboid structure, the lower shell 6 is fixed at the open end of the upper shell 1, and the vibrator system and the stator system are both accommodated in a cavity formed by the upper shell 1 and the lower shell 6. The lower shell 6 is provided with an extending supporting plate, the structure of the supporting plate corresponds to that of the flexible circuit board 5, the flexible circuit board 5 can be buckled or stuck and fixed on the supporting plate, and the lead wires of the coil extend to the outer side of the shell and are communicated with the flexible circuit board 5.
In the linear vibration motor of the embodiment of the invention, when the stator coil is fixed on the shell and the permanent magnet is fixed in the mass block, the permanent magnet is embedded at one side of the mass block in the long axis or short axis direction; when the stator coil is fixed on the mass block and the permanent magnet is fixed in the shell, the stator coil can be fixed on one side of the mass block in the major axis or minor axis direction, and the permanent magnet and the stator coil are correspondingly arranged.
As an example, fig. 4-1 and 4-2 show the structure and principle of a linear vibration motor according to a second embodiment of the present invention, respectively.
As shown in fig. 4-1 and fig. 4-2, the linear vibration motor of the second embodiment of the present invention includes a housing, a mass block 8', a stator coil 4' embedded in one end of the mass block 8 'in the long axis direction, and a permanent magnet 3' vertically fixed on the inner side wall of the housing, wherein the stator coil 4 'and the permanent magnet 3' are arranged in parallel; in addition, the motor also comprises a flexible circuit board connected with the internal and external circuits of the linear vibration motor, and the lead wires of the stator coil 4' extend to the flexible circuit board and are welded and conducted with the flexible circuit board.
Wherein, can set up the structure of dodging of going out of shape with stator coil 4 'adaptation in one side of the major axis direction of quality piece 8', stator coil 4 'can overlap and establish on quality piece 8', and permanent magnet 3 'then paste or welded fastening is on the inside wall of casing, and the direction of magnetizing of permanent magnet 3' is vertical and magnetizes, and the axis direction of stator coil 4 'is mutually perpendicular with the direction of magnetizing of permanent magnet 3'.
As shown in fig. 4-2, according to the left hand rule, the stress direction of the stator coil 4' in the magnetic field is upward F, and since the stator coil 4' is fixed on the mass block 8', the stator coil 4' which is subjected to upward pushing force drives the mass block 8' to perform upward translational movement together, so as to squeeze the elastic support 7' on the upper side of the mass block 8', and stretch the elastic support 7' on the lower side of the mass block 8 '. When the direction of the current in the stator coil 4 'is changed, the direction of the force applied to the stator coil 4' is changed, and the elastic supports 7 'on both sides of the mass 8' are stretched/pressed continuously after being restored from the pressed/stretched state. The above movements are alternately performed, and thus the reciprocating vibration of the linear vibration motor can be realized.
Fig. 5-1 and 5-2 show cross-sectional structures of a linear vibration motor according to a third embodiment of the present invention from different angles, respectively; fig. 5-3 illustrate the principle of a linear vibration motor according to a third embodiment of the present invention.
As shown in fig. 5-1 to 5-3 together, the linear vibration motor of the third embodiment of the present invention comprises a housing, a vibration system accommodated in the housing, and a stator system, wherein the vibration system comprises a mass block 8 "and a permanent magnet 3" embedded in one side of the mass block 8 "in the short axis direction, the stator system comprises a stator coil 4" vertically fixed on the inner side wall of the housing and a flexible circuit board (FPCB, flexible Printed Circuit Board) transversely fixed on the housing, the stator coil 4 "is in welding conduction with the flexible circuit board, and the connection of the internal circuit and the external circuit of the linear vibration motor is realized through the flexible circuit board.
Wherein, be provided with the accepting groove with permanent magnet 3 "looks adaptation in one side of quality piece 8" minor axis direction, permanent magnet 3 "can paste or welded fastening in the accepting groove of quality piece 8", and the magnetization direction of permanent magnet 3 "is vertical magnetization, and stator coil 4" then fixes on the casing of quality piece 8 "one end corresponding permanent magnet 3", and the axis direction of stator coil 4 "is perpendicular with the magnetization direction of permanent magnet 3". In addition, the end faces of the elastic supporting pieces 7 'for supporting the fixed mass block 8' where the permanent magnets 3 'are located are arranged between the upper end face and the lower end face of the mass block 8' and the side wall of the shell.
It should be noted that, in the linear vibration motors according to the second and third embodiments, other structural members of the Guan Xianxing vibration motor, such as the elastic supporting member, the damping member (including the damping member 2 'in fig. 4-1), the housing structure (including the lower housing 6' in fig. 4-1), etc., may be referred to the description of the first embodiment, and will not be repeated herein.
According to the embodiment, the permanent magnets of the linear vibration motor are asymmetrically arranged and distributed on one side of the long shaft or the short shaft of the linear vibration motor; in addition, the permanent magnet can be fixed on the mass block or the shell, the corresponding stator coil is fixed on the shell or the mass block, the positions of the stator coil and the mass block are correspondingly arranged, the asymmetrically arranged permanent magnet can not only reduce the occupation of the space of the mass block, but also increase the mass of the vibration system, can also reduce the resonance frequency of the linear vibration motor, and can heighten the vibration feeling and the user experience of the product.
The linear vibration motor according to the present invention is described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the linear vibration motor as set forth in the foregoing invention without departing from the spirit of the invention. Accordingly, the scope of the invention should be determined from the following claims.
Claims (6)
1. A linear vibration motor comprising a housing, a vibration system housed within the housing; wherein the vibration system comprises a mass block and a permanent magnet fixed in the mass block; it is characterized in that the method comprises the steps of,
the mass center of the permanent magnet is not coincident with the mass center of the vibration system;
the permanent magnets are asymmetrically distributed in the mass block, and the permanent magnets are asymmetrically distributed in the X-axis direction, the Y-axis direction and the Z-axis direction of the mass block;
the permanent magnet motor also comprises a stator system, wherein the stator system comprises stator coils which are arranged corresponding to the permanent magnet positions; the magnetizing direction of the permanent magnet is vertical magnetizing, and the axial direction of the stator coil is perpendicular to the magnetizing direction of the permanent magnet;
an elastic support piece is welded and fixed between the mass block and the shell, and the elastic support piece is used for supporting and suspending the mass block in the shell.
2. A linear vibration motor according to claim 1, wherein,
the permanent magnet is embedded at one side of the major axis or the minor axis of the mass block.
3. The linear vibration motor of claim 1, wherein the stator system further comprises a flexible circuit board secured to the housing;
the stator coil is conducted with the flexible circuit board.
4. A linear vibration motor according to claim 3, wherein,
the shell comprises an upper shell and a lower shell which are connected in an adaptive manner, a supporting plate extending out is arranged on the lower shell, and the flexible circuit board is buckled or stuck and fixed on the supporting plate.
5. A linear vibration motor according to claim 1, wherein,
damping elements are respectively arranged on the upper end face and the lower end face of the mass block and the permanent magnet, which are close to the shell.
6. A linear vibration motor according to claim 1, wherein,
corresponding Hua Siban is respectively stuck on one side or two sides of the permanent magnet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710293567.6A CN106911242B (en) | 2017-04-28 | 2017-04-28 | Linear vibration motor |
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| CN201710293567.6A CN106911242B (en) | 2017-04-28 | 2017-04-28 | Linear vibration motor |
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| CN106911242B true CN106911242B (en) | 2023-09-12 |
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| CN214674820U (en) * | 2020-12-22 | 2021-11-09 | 瑞声光电科技(常州)有限公司 | Vibration motor |
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