CN105680662B - Linear vibration electric motor - Google Patents
Linear vibration electric motor Download PDFInfo
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- CN105680662B CN105680662B CN201610184300.9A CN201610184300A CN105680662B CN 105680662 B CN105680662 B CN 105680662B CN 201610184300 A CN201610184300 A CN 201610184300A CN 105680662 B CN105680662 B CN 105680662B
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- mass block
- vibration motor
- linear vibration
- lower shell
- mass
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The present invention provides a kind of linear vibration electric motor, including the upper casing of adaptation connection and lower casing, be hung in upper casing and lower casing vibrational system, be correspondingly arranged with vibrational system stator, support vibrational system and provide the spring part of elastic restoring force for it;Wherein, vibrational system includes mass block and the permanent magnet for being incorporated into mass block medium position;Lower casing is stamped and formed out by permeability magnetic material, and elastic supporting member for supporting optical member is provided between mass block and lower casing;Wherein, elastic supporting member for supporting optical member is fixed on mass block/lower casing, and when mass block is moved with lower casing/mass block sliding friction.The frequency bandwidth of linear vibration electric motor can be extended using foregoing invention, reduce collision and noise.
Description
Technical Field
The present invention relates to the field of consumer electronics, and more particularly, to a linear vibration motor applied to a portable consumer electronic product.
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. However, with the continuous development and wide application of electronic products, higher and higher requirements are also put forward on the performance and service life of the vibration motor.
The conventional vibration motor generally includes an upper cover, a lower cover forming a vibration space with the upper cover, a vibrator (including a mass block and a permanent magnet) performing linear reciprocating vibration in the vibration space, an elastic support member connecting the upper cover and causing the vibrator to perform reciprocating vibration, and a stator coil located at a distance below the vibrator.
At present, the problems of noise and collision when a vibration motor (or a motor) vibrates are often difficult to avoid. In the prior art, magnetic liquid is generally coated in a space between a stator and a shell, and the vibration amplitude of a vibrator is reduced by using the friction force between the magnetic liquid and the shell, so that the effects of reducing noise and avoiding collision are realized.
However, the magnetic liquid is easy to splash in the falling process, and the physical performance of the magnetic liquid is easily influenced by the environmental temperature, so that the stability of the performance of the vibration motor is influenced.
Therefore, it is necessary to provide a new damping structure to reduce the impact and noise during the vibration of the vibration motor.
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 that the magnetic liquid is not easily fixed, the magnetic liquid is easily splashed, and the performance stability of the vibration motor is affected when the conventional vibration motor adopts a method of reducing noise by the magnetic liquid.
The invention provides a linear vibration motor, which comprises an upper shell, a lower shell, a vibration system, a stator and a spring part, wherein the upper shell and the lower shell are in adaptive connection; the vibration system comprises a mass block and a permanent magnet combined with the middle part of the mass block; the lower shell is formed by punching a magnetic conductive material, and an elastic supporting piece is arranged between the mass block and the lower shell; the elastic supporting piece is fixed on the mass block/lower shell and slides and rubs with the lower shell/mass block when the mass block moves.
In addition, it is preferable that the elastic supporting member is a polyester member, a silicone member, or a rubber member.
In addition, preferably, the elastic supporting piece is of a long strip structure and comprises a fixing part and a sliding part; wherein, the fixed part is fixed with the mass block/the lower shell; the cross section of the sliding part is of an arc structure, and when the mass block moves, the elastic supporting part is in sliding friction with the lower shell/mass block through the sliding part.
In addition, it is preferable that the length of the elastic support member is not greater than the width of the mass block in the Y-axis direction of the linear vibration motor, and the height of the elastic support member is equal to the distance between the mass block and the lower case.
Further, it is preferable that the surface of the wiping portion is coated with a lubricant.
In addition, it is preferable that the elastic supporting members are symmetrically disposed at both sides of the stator, and the elastic supporting members are spaced apart from the stator.
Furthermore, it is preferred that, when the spring support is fixed to the mass, the distance between the stator and the spring support in the rest state is greater than the distance of movement of the mass from the rest position to one end thereof.
In addition, it is preferable that, when the elastic support member is fixed to the lower case, a distance between an end of the mass close to the elastic support member and the elastic support member is larger than a distance of the mass moving from the rest position to an end thereof.
In addition, the preferable scheme is that a magnetic conduction plate is attached to the surface of the mass block, which is far away from the stator.
Further, it is preferable that the stator includes a stator coil fixed to the lower case; the vibration system comprises at least one permanent magnet, the middle position of the mass block is provided with a groove corresponding to the permanent magnet, and the permanent magnet is fixed in the corresponding groove; the magnetizing direction of the permanent magnet coincides with the axial direction of the stator coil.
By utilizing the linear vibration motor, the attaching state of the mass block and the elastic supporting piece is ensured through the attraction force between the magnetic lower shell and the permanent magnet, and the elastic supporting piece plays a role in flexible damping in the motion process of the mass block, so that the noise of the linear vibration motor can be effectively reduced; in addition, the lower shell formed by the magnetic conductive material also has the function of dredging magnetic induction lines, and the vibration induction of the linear vibration motor is increased.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described and particularly pointed out in the claims. 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. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description and appended claims, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is an exploded view of a linear vibration motor according to an embodiment of the present invention;
fig. 2 is a sectional view of a linear vibration motor according to an embodiment of the present invention.
Wherein the reference numerals include: the magnetic conduction device comprises an upper shell 1, a magnetic conduction plate 2, a permanent magnet 3, a mass block 4, a spring piece 5, a stator coil 6, an elastic supporting piece 7 and a lower shell 8.
The same reference numbers in all figures indicate 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.
As used in the description of the embodiments below, the "mass" may also be referred to as a "counterweight," which refers to a high mass, high density metal block that is secured to a permanent magnet that generates vibrations to enhance the vibration balance. In the invention, the mass block can be made of high-density metal materials such as a tungsten steel block, a nickel steel block or nickel-tungsten alloy and the like, so that the vibration force is increased, and the vibration of the electronic product is stronger.
In addition, the present invention is mainly used for the improvement of a micro vibration motor, but the application of the technology of the present invention to a large vibration motor is not excluded. For convenience of description, in the following description of the embodiments, the terms "linear vibration motor", "micro vibration motor" and "linear vibration motor" are used synonymously.
In order to describe the structure of the linear vibration motor of the present invention in detail, specific embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
Fig. 1 illustrates an exploded structure of a linear vibration motor according to the present invention; fig. 2 shows a sectional structure of a linear vibration motor according to the present invention.
As shown in fig. 1 and 2, the linear vibration motor according to the embodiment of the present invention includes an upper housing 1 and a lower housing 8 which are fittingly coupled, a vibration system suspended in the upper housing 1 and the lower housing 8, a stator disposed corresponding to the vibration system and spaced apart from the vibration system by a predetermined distance, and a spring member 5 supporting the vibration system and providing an elastic restoring force thereto; the vibration system comprises a mass 4 and a permanent magnet 3 combined with the mass 4 at the middle position. The lower case 8 is formed by punching a magnetic conductive material and can generate attractive magnetic force with the permanent magnet 3. Elastic supporting pieces 7 which are symmetrically distributed relative to the stator are arranged between the mass block 4 and the lower shell 8, the elastic supporting pieces 7 are fixed on the mass block/lower shell and are mutually attached to the lower shell/mass block when the mass block 4 moves, and the elastic supporting pieces 7 and the lower shell/mass block are in sliding friction in the moving process of the mass block 4 to provide damping for the vibration of the linear vibration motor.
The elastic supporting piece 7 is made of polyester, silica gel or rubber, and the like, namely the elastic supporting piece 7 can be made of polyester materials, rubber or other high-elasticity materials, and mainly plays a role in providing damping for the moving mass block 4, ensuring the linear motion of the mass block along the X axis of the linear vibration motor, reducing the friction loss in the vibration of the mass block and reducing the noise of a product.
In one embodiment of the present invention, the elastic supporting members 7 are in a strip structure, symmetrically disposed on both sides of the stator and spaced from the stator by a certain distance; the elastic supporting member 7 includes a fixing portion and a sliding portion, the fixing portion is a plane fixedly connected with the mass block or the lower shell, the sliding portion is a structure having a certain radian and having a sliding friction with the lower shell or the mass block and playing a damping role, for example, the cross section of the sliding portion may be set to be an arc or an arch structure. Wherein, for the installation of the elastic supporting member, the length of the elastic supporting member 7 is not more than the width of the mass block in the Y-axis direction of the linear vibration motor, and the height of the elastic supporting member 7 is equal to the distance between the mass block and the lower shell.
In addition, in order to reduce the friction coefficient between the sliding part of the elastic support member 7 and the lower case or the mass block and reduce the friction loss therebetween, in the linear vibration motor of the present invention, a lubricant such as a lubricating oil or a lubricating fluid may be applied to the elastic support member 7 or the sliding part thereof.
Embodiment one (fixed part of the elastic supporting piece is fixedly connected with the lower shell, and the sliding part is in sliding friction with the mass block)
In the first embodiment, the housing includes an upper case 1 provided with a notch, and a lower case 8 which is connected to the upper case 1 in a fitting manner and forms a cavity in which the vibration system and the stator are accommodated. The lower shell 8 is made of a magnetic conductive material and can generate magnetic force attracting the permanent magnet 3. The elastic supporting pieces 7 are of a long strip-shaped structure and are provided with two strips, the two elastic supporting pieces 7 are symmetrically fixed on two sides of the stator and keep a certain distance with the stator, the elastic supporting pieces 7 are located on the same side of the mass block 4, the magnetic conduction plate 2 is arranged on the other side of the mass block 4, and the magnetic conduction plate 2 is attached to the side face of the mass block 4 in a sticking or welding mode.
Wherein, the both ends of quality piece 4 are respectively through the lateral wall elastic connection of spring part 5 with epitheca 1, provide elastic restoring force for the motion of quality piece 4 through spring part 5, in the motion of quality piece 4, elastic support piece 7 is fixed motionless on inferior valve 8, because inferior valve 8 adopts magnetic material to make, the magnetic force between the permanent magnet 3 in inferior valve 8 and quality piece 4 can order about quality piece 4 atress downwards, simultaneously because elastic support piece 7's supporting role, make quality piece 4 in the motion only can follow linear vibrating motor's X axle direction motion, and laminate and sliding friction with elastic support piece 7's the portion of wiping. The magnetic conductivity of the lower shell 8 enables the mass block 4 to be attached to the elastic support 7, so that the linear motion of the mass block 4 is kept, and the magnetic induction line can be dredged, so that the vibration induction of the linear vibration motor is enhanced.
In addition, in order to ensure that the mass can always maintain the fitting state with the elastic support 7 when moving, in this embodiment, when the elastic support 7 is fixed on the lower case 8, the distance between the end of the mass 4 close to the elastic support 7 and the elastic support 7 is greater than the distance of the mass 4 moving from the rest position to one end thereof. For example, when the mass 4 is at rest, the distance between the elastic support 7 located at the left side of the stator and the left end of the mass 4 is greater than the maximum distance of the mass 4 moving to the left from the rest state, so as to prevent the mass 4 from falling off the elastic support 7 during the movement.
Embodiment two (fixed part of the elastic supporting piece is fixedly connected with the mass block, and the sliding part is in sliding friction with the lower shell)
In the second embodiment, the structures of the housing, the spring element, the magnetic conductive plate and the elastic supporting element can be referred to the description of the first embodiment, and are not further described herein. In the second embodiment, the elastic supporting member is located on the same side of the mass block, and the fixing portion of the elastic supporting member is fixedly connected with the mass block and moves along with the movement of the mass block, and the sliding portion of the elastic supporting member is in sliding contact with the lower shell.
The two ends of the mass block are respectively connected with the side wall of the upper shell through the spring pieces, the spring pieces provide elastic restoring force for the movement of the mass block, the elastic support piece is fixed on the lower shell and is still in the movement process of the mass block, the lower shell is made of a magnetic conductive material, the magnetic force between the permanent magnet in the lower shell and the permanent magnet in the mass block tends to force the mass block downwards, and meanwhile, due to the action of the elastic support piece, the mass block in the movement can only move along the X-axis direction of the linear vibration motor and is attached to the sliding friction part of the elastic support piece and slides and rubs. The magnetic conductivity of the lower shell can enable the mass block to be attached to the elastic support piece, so that the linear motion of the mass block is kept, and the magnetic induction line can be dredged to enhance the vibration induction of the linear vibration motor.
In addition, in order to ensure that the mass can always keep the fitting state with the elastic support when moving, in the embodiment, when the elastic support is fixed on the mass, the distance between the stator and the elastic support in the static state is larger than the distance of the mass moving from the static position to one end of the mass. For example, when the mass block is in a static state, the minimum distance between the elastic support located on the left side of the stator and the stator is greater than the maximum distance of the mass block moving to the left from the static state, so that the elastic support is prevented from colliding with the stator during the movement of the mass block.
In the above embodiments, the stator includes the stator coil 6 fixed on the lower shell 8, the vibration system includes at least one permanent magnet, the middle position of the mass block is provided with a groove corresponding to the permanent magnet, the permanent magnet is fixed in the corresponding groove; the magnetizing direction of the permanent magnet coincides with the axial direction of the stator coil 6.
Specifically, the vibration system comprises three permanent magnets which are adjacently arranged, wherein the adjacent ends of the two permanent magnets which are adjacently arranged have opposite polarities, namely the permanent magnets are arranged in an S-N, N-S, S-N sequence or an N-S, S-N, N-S sequence in the Z-axis direction of the linear vibration motor; moreover, the thicknesses of the permanent magnets in the Z-axis direction are the same, the length of the permanent magnet in the middle position in the X-axis direction of the linear vibration motor is larger than that of the permanent magnet adjacent to the permanent magnet in the X-axis direction of the linear vibration motor, and the volume of the permanent magnet can be increased to enable the stator to obtain the magnetic flux as large as possible, so that the vibration sense of the linear vibration motor is enhanced, and better user experience is obtained. Correspondingly, the sizes of the groove and the accommodating groove corresponding to the permanent magnet are also designed into the middle groove and the grooves on two sides, and the size of the middle groove is larger than the sizes of the grooves on two sides, so that the magnetic liquid is firmly adsorbed in the corresponding groove.
In addition, in the linear vibration motor of the present invention, the stator includes the stator coil 6 provided on the side of the vibration system away from the flux guide plate, and the axial direction of the stator wire coincides with the magnetizing direction of the permanent magnet. The axial direction of the stator coil 6 is the direction of the central axis of the stator coil 6, in the specific embodiment shown in fig. 1 and 2, the magnetization mode of the permanent magnet is Z-phase magnetization, the axial direction of the stator coil 6 is vertical, and the winding directions of the two stator coils 6 arranged in parallel are the same or the current directions passing through the stator coils are the same.
The linear vibration motor of the present invention further includes a Flexible Printed circuit board (PFCB); wherein, a flexible circuit board (not shown in the figure) is fixedly connected with the lower casing 8, the stator coil 6 is fixed on the flexible circuit board and conducted with the flexible circuit board, and the communication between the internal circuit and the external circuit of the linear vibration motor is realized through the flexible circuit board. After an external current signal is transmitted to the stator coil 6 through the flexible circuit board, the stator coil 6 generates electromagnetic force under the action of a magnetic field generated by vibrating the system, and the vibrating system can receive the reaction force of the stator coil 6 because the stator coil 6 is fixed, and is driven to vibrate by the elastic supporting piece 7.
According to the linear vibration motor, the lower shell is formed by punching a magnetic conductive material, the elastic supporting piece is arranged between the mass block and the lower shell, and the magnetic force between the permanent magnet and the lower shell enables the elastic supporting piece and the mass block or the lower shell to be mutually attached to generate friction force so as to provide damping for the linear vibration motor, so that the frequency bandwidth is expanded, and collision and noise are reduced; in addition, set up the inferior valve into magnetic conduction spare, can also dredge the magnetic induction line that passes the stator coil, increase linear vibrating motor's the sense of shaking.
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 of the present invention as set forth above without departing from the spirit of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (9)
1. A linear vibration motor comprises an upper shell and a lower shell which are connected in a matching way, a vibration system suspended in the upper shell and the lower shell, a stator arranged corresponding to the vibration system, and a spring piece for supporting the vibration system and providing elastic restoring force for the vibration system; the vibration system comprises a mass block and a permanent magnet combined at the middle position of the mass block; it is characterized in that the preparation method is characterized in that,
the elastic supporting pieces are symmetrically arranged on two sides of the stator, the elastic supporting pieces and the stator are arranged at intervals, and the stator comprises stator coils fixed on the lower shell;
the lower shell is formed by punching a magnetic conductive material, and an elastic supporting piece is arranged between the mass block and the lower shell; wherein,
the elastic supporting piece is fixed on the mass block/lower shell and is in sliding friction with the lower shell/mass block when the mass block moves.
2. The linear vibration motor of claim 1,
the elastic supporting piece is a polyester piece, a silica gel piece or a rubber piece.
3. The linear vibration motor of claim 1,
the elastic supporting piece is of a strip-shaped structure and comprises a fixing part and a sliding part; wherein,
the fixing part is fixed with the mass block/lower shell;
the cross section of the sliding part is of an arc-shaped structure, and when the mass block moves, the elastic supporting piece is in sliding friction with the lower shell/mass block through the sliding part.
4. The linear vibration motor of claim 3,
the length of the elastic supporting piece is not more than the width of the mass block in the Y-axis direction of the linear vibration motor, and the height of the elastic supporting piece is equal to the distance between the mass block and the lower shell.
5. The linear vibration motor of claim 3,
and a lubricant is coated on the surface of the sliding part.
6. The linear vibration motor of claim 1, wherein when said elastic support member is fixed to said mass,
the distance between the stator and the elastic support in the rest state is greater than the distance of the mass moving from the rest position to one end thereof.
7. The linear vibration motor of claim 1, wherein when said elastic support member is fixed to said lower case,
the distance between the end of the mass close to the elastic support and the elastic support is greater than the distance of the mass moving from the rest position to one end of the mass.
8. The linear vibration motor of claim 1,
and a magnetic conduction plate is attached to the surface of the mass block, which is far away from the stator.
9. The linear vibration motor of claim 1,
the vibration system comprises at least one permanent magnet, a groove corresponding to the permanent magnet is arranged in the middle of the mass block, and the permanent magnet is fixed in the corresponding groove; and,
the magnetizing direction of the permanent magnet coincides with the axial direction of the stator coil.
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CN201610184300.9A CN105680662B (en) | 2016-03-28 | 2016-03-28 | Linear vibration electric motor |
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CN201610184300.9A CN105680662B (en) | 2016-03-28 | 2016-03-28 | Linear vibration electric motor |
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CN105680662B true CN105680662B (en) | 2018-07-20 |
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Address after: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Applicant after: Goertek Inc. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Applicant before: Goertek Inc. |
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