CN109802550B - Vibrating diaphragm type linear motor - Google Patents
Vibrating diaphragm type linear motor Download PDFInfo
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- CN109802550B CN109802550B CN201910075433.6A CN201910075433A CN109802550B CN 109802550 B CN109802550 B CN 109802550B CN 201910075433 A CN201910075433 A CN 201910075433A CN 109802550 B CN109802550 B CN 109802550B
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Abstract
The invention provides a vibrating diaphragm type linear motor which comprises a motor shell, a vibrator and an elastic unit, wherein the vibrator is suspended in the motor shell, the elastic unit is used for providing elastic restoring force for the vibrator, the elastic unit comprises vibrating diaphragms respectively positioned at two ends of the vibrator in the vibration direction, and the vibrating diaphragms are fixedly connected with the vibrator. The vibration diaphragm is adopted to replace the elastic sheet, and the damping of the vibration diaphragm is much larger than that of the elastic sheet, so that the amplitude variation of the linear motor driven under the same voltage and different frequencies is smaller, the vibration sensing driving is easier to control, and the stop time of the elastic unit can be greatly reduced.
Description
Technical Field
The present invention relates to the field of vibration technology of electronic devices, and more particularly, to a diaphragm type linear motor.
Background
Linear vibration motors, linear motors for short, generally comprise three major components: stator, oscillator and elastic element. The elastic element of the linear vibration motor currently on the market is basically made of a spring plate. The elastic sheet has small damping, large vibration inductance change of different driving frequencies, serious nonlinearity, difficult control and long stop time, and if the damping needs to be increased, the magnetic fluid is often used, so that the difficulty of the assembly process is greatly increased.
Disclosure of Invention
In view of the above problems, the present invention provides a diaphragm type linear motor, which includes a motor housing, a vibrator, and an elastic unit suspending the vibrator in the motor housing and providing elastic restoring force to the vibrator, wherein the elastic unit includes diaphragms respectively located at two ends of the vibrator in a vibration direction, and the diaphragms are fixedly connected to the vibrator.
The vibration diaphragm is adopted to replace the elastic sheet, and the damping of the vibration diaphragm is much larger than that of the elastic sheet, so that the amplitude variation of the linear motor driven under the same voltage and different frequencies is smaller, the vibration sensing driving is easier to control, and the stop time of the elastic unit can be greatly reduced.
Preferably, the diaphragm includes an annular suspension edge, a first fixing portion located inside the suspension edge, and a second fixing portion located outside the suspension edge; reinforcing ribs are arranged on the suspension edges; the vibrating diaphragm type linear motor further comprises a support, the support is fixedly connected to the motor shell, and the vibrating diaphragm is fixed to the support.
Preferably, the first fixing portion of the diaphragm is fixedly connected with the oscillator, and the second fixing portion is fixedly connected with the bracket.
Preferably, the second fixing portion of the diaphragm is fixedly connected with the oscillator, and the first fixing portion is fixedly connected with the bracket.
Preferably, the first fixing part and the second fixing part are planes, the overhanging edge is raised upwards relative to the first fixing part and the second fixing part, and the section of the overhanging edge 21 is arched in an arc shape; and reinforcing ribs are arranged on the suspension edges.
Preferably, the motor housing includes an upper cover, and the diaphragm type linear motor further includes an electromagnet fixed to the upper cover; the electromagnet comprises an iron core and a first coil wound on the iron core, and alternating current with the current direction changing periodically is applied to the first coil; the vibrator includes a permanent magnet including a first permanent magnet; the vibration direction of the diaphragm type linear motor is the horizontal direction, and the magnetic pole directions of the first permanent magnet and the electromagnet are parallel to the vibration direction of the diaphragm type linear motor.
Preferably, the permanent magnet further comprises a second permanent magnet, and the magnetic poles of the first permanent magnet and the second permanent magnet are oppositely arranged; the electromagnet is arranged between the first permanent magnet and the second permanent magnet; the vibration direction of the diaphragm type linear motor is the horizontal direction, and the magnetic pole directions of the first permanent magnet, the electromagnet and the second permanent magnet are all parallel to the vibration direction of the diaphragm type linear motor.
Preferably, the motor housing has an upper cover, the upper cover has a protrusion extending in the vibrator direction, and the electromagnet is fixed to the protrusion of the upper cover.
Preferably, the vibrator includes a fixing block for fixing the permanent magnet.
Preferably, the vibrator comprises a mass block and a third permanent magnet connected with the mass block in a nested mode; the diaphragm type linear motor further comprises a second coil, the motor shell comprises an upper cover, and the second coil is fixed on the upper cover; the vibration direction of the diaphragm type linear motor is the horizontal direction, and the magnetic pole direction of the third permanent magnet is perpendicular to the vibration direction of the diaphragm type linear motor.
Preferably, the diaphragm type linear motor further includes a flexible printed circuit board, and the second coil is electrically connected to the flexible printed circuit board.
Compared with the prior art, the invention has the beneficial effects that:
the vibration diaphragm is adopted to replace the elastic sheet, and the damping of the vibration diaphragm is much larger than that of the elastic sheet, so that the amplitude variation of the linear motor driven under the same voltage and different frequencies is smaller, the vibration sensing driving is easier to control, and the stop time of the elastic unit can be greatly reduced.
Drawings
Fig. 1 is an exploded view of a diaphragm type linear motor according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an elastic unit of a diaphragm type linear motor according to a first embodiment of the present invention;
fig. 3 is a cross-sectional view of an elastic unit of a diaphragm type linear motor according to a first embodiment of the present invention;
fig. 4 is a top view of a diaphragm linear motor according to a first embodiment of the present invention;
FIG. 5 is a cross-sectional view taken at A-A of FIG. 4;
fig. 6 is a cross-sectional view of a diaphragm type linear motor according to a second embodiment of the present invention;
FIG. 7 is a diagram illustrating the force of the electromagnet on the permanent magnet after the coil is energized according to the second embodiment of the present invention;
fig. 8 is a diagram illustrating the force of the electromagnet on the permanent magnet after the direction of the coil current is changed according to the second embodiment of the present invention.
Reference numerals:
11-upper cover, 12-lower shell, 2-vibrating diaphragm, 21-overhanging edge, 211-reinforcing rib, 22-second fixing part, 23-first fixing part, 3-vibrator, 31-third permanent magnet, 32-mass block, 4-bracket, 5-second coil, 6-fixing block, 7-electromagnet, 71-iron core, 72-first coil, 81-first permanent magnet, 82-second permanent magnet and 9-lug.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment of the present invention, as shown in fig. 1 to 5, a diaphragm type linear motor includes a motor housing, a vibrator 3, and an elastic unit suspending the vibrator 3 in the motor housing and providing an elastic restoring force to the vibrator 3. The elastic unit provides mechanical support and power output or conversion for the whole vibration motor, and improves the working frequency of the product. The motor housing includes an upper cover 11 and a lower cover 12.
The elastic unit comprises vibrating diaphragms 2 respectively positioned at two ends of the vibrator 3 in the vibration direction, and the vibrating diaphragms 2 are fixedly connected with the vibrator 3. The diaphragms 2 are generally used in pairs, and in the present embodiment, there are two diaphragms 2.
The diaphragm 2 includes an annular suspended edge 21, a first fixing portion 23 located inside the suspended edge 21, and a second fixing portion 22 located outside the suspended edge 21.
The suspended edge 21 is upwardly convex with respect to the first fixing portion 23 and the second fixing portion 22, the cross section of the suspended edge 21 is arched, and the suspended edge 21 is annular as a whole. Since the hanging edge 21 has a certain elasticity, the vibrator 3 can be used as an elastic unit of the linear motor when the vibrator vibrates.
The hanging edge 21 is provided with a reinforcing rib 211, and the reinforcing rib 211 is in a concave pattern on the hanging edge 21. The ribs 211 may be linear as shown; the rib 211 may have an involute shape.
The vibrating diaphragm type linear motor further comprises a support 4, the support 4 is fixedly connected to the motor shell, and the vibrating diaphragm 2 is fixed to the support 4.
As shown in fig. 2, the first fixing portion 23 of the inner ring of the diaphragm 2 is fixedly connected to the vibrator 3, and the second fixing portion 22 of the outer ring of the diaphragm 2 is fixedly connected to the bracket 4, and the connection manner may be bonding by adhesive glue. Preferably, the first fixing portion 23 and the second fixing portion 22 are both flat surfaces, and the joint surfaces of the diaphragm 2, the bracket 4 and the motor casing, which are fixedly connected, are both flat surfaces, so that the bonding is easier. The bracket 4 is welded to the motor housing.
In other embodiments, the fixing manner of the diaphragm 2 may also be: the second fixing part 22 of the inner ring of the vibrating diaphragm 2 is fixedly connected with the vibrator 3, and the first fixing part 23 of the outer ring of the vibrating diaphragm 2 is fixedly connected with the bracket 4.
The material of the diaphragm 2 may be selected from polyetheretherketone PEEK, polyimide PI, polyethylene naphthalate PEN, polyethylene terephthalate PET, and the like.
In this embodiment, the inner ring of the diaphragm 2 further has an inner hole. In other embodiments, the inner ring of the diaphragm 2 may not have an inner hole.
As shown in fig. 1, 3 to 5, in the present embodiment, the vibrator 3 includes a mass 32 and a third permanent magnet 31 nested in and connected to the mass 32; a through hole is provided in the mass 32, and the third permanent magnet 31 is disposed in the through hole of the mass 32.
The diaphragm type linear motor further includes a second coil 5, and the second coil 5 is located directly above the third permanent magnet 31 of the vibrator 3. The second coil 5 is generally flat, and the second coil 5 may be fixed to the upper cover 11 by bonding, and the second coil 5 may be spaced apart from the vibrator 3. The direction of the N-S pole of the third permanent magnet 31 is perpendicular to the direction of vibration, the direction of vibration of the diaphragm linear motor is horizontal, and the direction of polarization of the permanent magnet is vertical.
In the present embodiment, the power driving structure includes the third magnet on the vibrator 3 and the second coil 5 on the upper cover 11. When the second coil 5 is energized, the vibrator 3 linearly vibrates in the horizontal direction.
The diaphragm type linear motor further comprises a flexible printed circuit board, and the second coil 5 is electrically connected with the flexible printed circuit board. The flexible printed circuit board is fixedly arranged on the upper cover 11 in an adhesion mode.
In this embodiment, the elastic sheet is replaced by the vibrating diaphragm, and the damping of the vibrating diaphragm is much larger than that of the elastic sheet, so that the amplitude variation of the linear motor driven under the same voltage and different frequencies is smaller, the vibration sensing driving is easier to control, and meanwhile, the stop time of the elastic unit can be greatly reduced.
Example two
In the diaphragm type linear motor according to the first embodiment, the power drive structure includes the third magnet on the vibrator 3 and the second coil 5 on the upper cover 11, and the diaphragm type linear motor has a small vibration intensity and often needs to use a plurality of diaphragm type linear motors to drive the target object.
Unlike the first embodiment, the present embodiment also improves the power driving structure of the diaphragm type linear motor.
As shown in fig. 6, in the present embodiment, the vibrator 3 includes a permanent magnet and a fixing block 6 for fixing the permanent magnet. The permanent magnets include a first permanent magnet 81 and a second permanent magnet 82. In the vibrator 3, the first permanent magnet 81 and the second permanent magnet 82 are provided so that their magnetic poles face each other.
The electromagnet 7 includes an iron core 71 and a first coil 72 wound around the iron core 71, and an alternating current whose current direction changes periodically is applied to the first coil 72. The waveform of the alternating current can be a sine curve, and the waveform can also be a triangular wave or a square wave. But preferably the mains used in life, i.e. an alternating current with a sinusoidal waveform, can be used.
The motor shell comprises an upper cover 11, the diaphragm type linear motor further comprises an electromagnet 7, and the electromagnet 7 is fixed on the upper cover 11. Specifically, the upper cover 11 has a bump 9 extending in the direction of the vibrator 3, and the electromagnet 7 is fixed to the bump 9 of the upper cover 11.
The electromagnet 7 is provided between the first permanent magnet 81 and the second permanent magnet 82, and three of the first permanent magnet 81, the electromagnet 7, and the second permanent magnet 82 are provided side by side. The vibration direction of the diaphragm type linear motor is the horizontal direction, and the magnetic pole directions of the first permanent magnet 81, the electromagnet 7, and the second permanent magnet 82 are all the horizontal direction. The first permanent magnet 81, the electromagnet 7, and the second permanent magnet 82 are spaced from each other.
In the non-energized state, the first permanent magnet 81, the electromagnet 7, and the second permanent magnet 82 are preferably spaced apart from each other by the same gap. It can be understood that the first permanent magnet 81, the electromagnet 7, and the second permanent magnet 82 are symmetrically disposed on the linear motor, so that the forces applied to the left and right sides of the vibrator 3 are balanced when the vibrator is not energized.
For example, as shown in fig. 7, from left to right, the magnetic poles of the first permanent magnet 81 are arranged to be S-N, the magnetic poles of the electromagnet 7 located in the middle may be arranged to be S-N, and the magnetic poles of the second permanent magnet 82 are arranged to be N-S. At this time, the first permanent magnet 81 and the permanent magnet are attracted by opposite poles, and the direction in which the electromagnet 7 gives a force F1 to the first permanent magnet 81 is rightward; the same polarity of the electromagnet 7 is repelled from the second permanent magnet 82 and the direction of another force F2 applied by the electromagnet 7 to the second permanent magnet 82 is also rightward. The vibrator 3 receives a force to the right as a whole and moves to the right.
When the directions of the alternating currents in the first coils 72 are simultaneously changed, as shown in fig. 8, the magnetic pole directions of the electromagnets 73 are simultaneously changed, and the magnetic pole arrangement of the electromagnet 7 is changed from S-N to N-S. At this time, the same polarity of the first permanent magnet 81 is repelled from the permanent magnet, and the direction in which the electromagnet 7 gives a force F1 to the first permanent magnet 81 is leftward; the opposite pole attraction between the electromagnet 7 and the second permanent magnet 82, and the direction of the other force F2 given to the second permanent magnet 82 by the electromagnet 7 is also leftward. Then the vibrator 3 as a whole receives a leftward force and moves leftward.
Therefore, as the direction of the alternating current in the first coil 72 changes, the direction of the force between the electromagnet 7 and the permanent magnet changes. The vibrator 3 is finally driven to vibrate back in a linear direction. In addition, compared with the structure of a conventional linear vibration motor, the permanent magnet and the electromagnet are used as the power driving structure, so that a larger vibration quantity can be realized, the structure is simpler, and the vibration starting and stopping time is short.
It should be noted that in other embodiments, the permanent magnet may include only one permanent magnet, i.e., the first permanent magnet 81. The first permanent magnet 81 and the electromagnet 7 are arranged side by side. The vibration direction of the diaphragm type linear motor is the horizontal direction, and the magnetic pole directions of the first permanent magnet 81 and the electromagnet 7 are parallel to the vibration direction of the diaphragm type linear motor, and are both the horizontal direction. Therefore, as the direction of the alternating current in the first coil 72 of the electromagnet 7 changes, the direction of the force acting between the electromagnet 7 and the first permanent magnet 81 changes. Eventually also the vibrator 3 is driven to vibrate back in a linear direction. However, in this embodiment, as compared with the case where the first permanent magnet 81 and the second permanent magnet 82 are provided at the same time, the driving force applied to the vibrator 3 is reduced, and therefore, the vibration of the linear vibration module is reduced. Meanwhile, the balance of linear vibration is poor.
In the second embodiment, the elastic sheet is replaced by the vibrating diaphragm, and the damping of the vibrating diaphragm is much larger than that of the elastic sheet, so that the amplitude change of the linear motor driven under the same voltage and different frequencies is smaller, the vibration sensing driving is easier to control, and meanwhile, the stop time of the elastic unit can be greatly reduced.
In addition, the permanent magnet and the electromagnet are arranged side by side, and the magnetic pole directions of the first permanent magnet and the electromagnet are parallel to the vibration direction of the diaphragm type linear motor; and alternating current is applied to the first coil of the electromagnet, so that magnetic poles at two ends of the electromagnet change along with the change of the current direction, the mutual acting force direction of the permanent magnet and the electromagnet changes along with the direction of the alternating current, and finally the vibrator is driven to return to vibrate along the linear direction.
Compared with the prior art, the invention has the beneficial effects that:
1. the vibration diaphragm is adopted to replace the elastic sheet, and the damping of the vibration diaphragm is much larger than that of the elastic sheet, so that the amplitude variation of the linear motor driven under the same voltage and different frequencies is smaller, the vibration sensing driving is easier to control, and the stop time of the elastic unit can be greatly reduced.
2. The permanent magnet and the electromagnet are arranged, so that the mutual acting force direction of the permanent magnet and the electromagnet changes along with the direction of alternating current, and the vibrator is finally driven to vibrate back along the linear direction.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting the same, and although the embodiments of the present invention are described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot make the modified technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A vibrating membrane type linear motor comprises a motor shell, a vibrator and an elastic unit, wherein the vibrator is suspended in the motor shell and provides elastic restoring force for the vibrator;
the vibrating diaphragm comprises an annular suspension edge, a first fixing part and a second fixing part, wherein the first fixing part is positioned on the inner side of the suspension edge, and the second fixing part is positioned on the outer side of the suspension edge; the vibrating diaphragm type linear motor also comprises a support, the support is fixedly connected to the motor shell, and the vibrating diaphragm is fixed on the support; the suspended edge is upwards raised relative to the first fixing part and the second fixing part, and the cross section of the suspended edge is arched in an arc shape.
2. The diaphragm type linear motor according to claim 1, wherein the first fixing portion of the diaphragm is fixedly connected to the vibrator, and the second fixing portion is fixedly connected to the bracket.
3. The diaphragm type linear motor according to claim 1, wherein the second fixing portion of the diaphragm is fixedly connected to the vibrator, and the first fixing portion is fixedly connected to the bracket.
4. The diaphragm linear motor according to claim 1, wherein the first fixing portion and the second fixing portion are flat surfaces, the overhanging portion is upwardly convex with respect to the first fixing portion and the second fixing portion, and a cross section of the overhanging portion is curved and arched; and reinforcing ribs are arranged on the suspension edges.
5. The diaphragm linear motor according to claim 1, wherein said motor housing includes an upper cover, said diaphragm linear motor further comprising an electromagnet, said electromagnet being fixed to said upper cover; the electromagnet comprises an iron core and a first coil wound on the iron core, and alternating current with the current direction changing periodically is applied to the first coil; the vibrator includes a permanent magnet including a first permanent magnet; the vibration direction of the diaphragm type linear motor is the horizontal direction, and the magnetic pole directions of the first permanent magnet and the electromagnet are parallel to the vibration direction of the diaphragm type linear motor.
6. The diaphragm linear motor according to claim 5, wherein said permanent magnet further comprises a second permanent magnet, and poles of said first permanent magnet and said second permanent magnet are disposed to be opposite to each other; the electromagnet is arranged between the first permanent magnet and the second permanent magnet; the vibration direction of the diaphragm type linear motor is the horizontal direction, and the magnetic pole directions of the first permanent magnet, the electromagnet and the second permanent magnet are all parallel to the vibration direction of the diaphragm type linear motor.
7. The diaphragm type linear motor according to claim 5, wherein said motor housing has an upper cover, said upper cover having a projection extending in a vibrator direction, said electromagnet being fixed at the projection of the upper cover.
8. The diaphragm type linear motor according to claim 5, wherein said vibrator includes a fixing block for fixing a permanent magnet.
9. The diaphragm type linear motor according to claim 1, wherein said vibrator includes a mass, and a third permanent magnet nestingly connected to the mass; the diaphragm type linear motor further comprises a second coil, the motor shell comprises an upper cover, and the second coil is fixed on the upper cover; the vibration direction of the diaphragm type linear motor is the horizontal direction, and the magnetic pole direction of the third permanent magnet is perpendicular to the vibration direction of the diaphragm type linear motor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910075433.6A CN109802550B (en) | 2019-01-25 | 2019-01-25 | Vibrating diaphragm type linear motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910075433.6A CN109802550B (en) | 2019-01-25 | 2019-01-25 | Vibrating diaphragm type linear motor |
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| CN109802550A CN109802550A (en) | 2019-05-24 |
| CN109802550B true CN109802550B (en) | 2020-05-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112671200A (en) * | 2020-12-15 | 2021-04-16 | 歌尔股份有限公司 | Linear vibration motor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1222425A (en) * | 1967-03-04 | 1971-02-10 | Philips Nv | Electrodynamic vibrator compressor |
| CN2572659Y (en) * | 2002-10-06 | 2003-09-10 | 刘奥宇 | Reciprocative straight line motor |
| CN204046800U (en) * | 2014-01-16 | 2014-12-24 | 宁波升亚电子有限公司 | A kind of waveform vibration unit |
| CN206602446U (en) * | 2016-10-25 | 2017-10-31 | 瑞声科技(新加坡)有限公司 | Linear vibration electric motor |
| CN208174511U (en) * | 2018-06-08 | 2018-11-30 | 信利光电股份有限公司 | A kind of linear vibration motor |
-
2019
- 2019-01-25 CN CN201910075433.6A patent/CN109802550B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1222425A (en) * | 1967-03-04 | 1971-02-10 | Philips Nv | Electrodynamic vibrator compressor |
| CN2572659Y (en) * | 2002-10-06 | 2003-09-10 | 刘奥宇 | Reciprocative straight line motor |
| CN204046800U (en) * | 2014-01-16 | 2014-12-24 | 宁波升亚电子有限公司 | A kind of waveform vibration unit |
| CN206602446U (en) * | 2016-10-25 | 2017-10-31 | 瑞声科技(新加坡)有限公司 | Linear vibration electric motor |
| CN208174511U (en) * | 2018-06-08 | 2018-11-30 | 信利光电股份有限公司 | A kind of linear vibration motor |
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