CN207742217U - A kind of self-powered 3-axis acceleration sensor - Google Patents
A kind of self-powered 3-axis acceleration sensor Download PDFInfo
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- CN207742217U CN207742217U CN201721630950.8U CN201721630950U CN207742217U CN 207742217 U CN207742217 U CN 207742217U CN 201721630950 U CN201721630950 U CN 201721630950U CN 207742217 U CN207742217 U CN 207742217U
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Abstract
A kind of self-powered 3-axis acceleration sensor of the utility model offer and detection method, belong to energy and material and device arts.Cantilever beam totally four is in two-by-two vertically crossing distribution, and cantilever beam end is equipped with piezoelectric layer, is detected for 3-axis acceleration；Free end is connected with matrix gauge block, and end is connected with support construction；Being fixedly connected sequentially immediately below matrix gauge block has quality of assistance block, permanent magnet, and three constitutes entire mass block；Electromagnetic induction coil is placed in immediately below permanent magnet, on the inner bottom surface of support construction, is powered for acceleration transducer for acquiring vibrational energy.The utility model proposes acceleration transducer any direction acceleration can be detected, and self-powered may be implemented, reduces cost, expand application range.
Description
Technical field
The utility model belongs to energy and material and device arts, though it is special be related to it is a kind of based on electromagnetic induction principle from
Power supply 3-axis acceleration sensor and detection method.
Background technology
Acceleration transducer is a kind of electronic equipment that can measure acceleration, has been widely used in auto industry, boat
Empty space flight, the fields such as military equipment.Although piezoelectric acceleration transducer does not need power supply when detecting, its output signal is not
It can directly be obtained by AD Acquisition Circuit, it is necessary to power for it through constant-current source, and by its signal condition at standard signal.And wireless
Sensing network application in, due to number of nodes mostly with distribution it is big, battery altering problem is difficult to solve；Meanwhile for many
Power supply cannot be provided, need long term monitoring, battery to be not easy replacement or the application of inflammable and explosive equal dangerous situations, it is necessary to using passive
Sensor measures to realize；Acceleration transducer passive can also be substantially reduced the power consumption and volume of system, improve system collection
Cheng Du.Therefore, the self-powered for realizing acceleration transducer, is of great significance.
Vibrational energy is a kind of energy of generally existing in natural environment, the operation of production equipment, the traveling of the vehicles, people
The movement of body can all generate vibrational energy.For acceleration transducer, application scenarios are mostly dynamic environment, and acquisition vibrational energy is it
Power supply is a tempting idea.According to the difference of operation principle, vibrational energy acquisition be based primarily upon piezoelectric effect, electromagnetic induction,
Four kinds of methods such as electrostatic induction and triboelectricity.Wherein electromagnetic vibration energy acquisition is based on Faraday's electromagnetic induction law, leads to
It crosses extraneous vibration and changes magnetic flux, acquire the induced current generated in coil.Therefore, electromagnetic vibration energy acquisition can generally adopt
With coil, the design of spring and magnet.Electromagnetic vibration energy collecting efficiency is high, but volume is larger, increases for device miniaturization
Difficulty.
Invention content
The utility model provides a kind of self-powered 3-axis acceleration sensor, is sensed with solving traditional piezoelectric type acceleration
The problem of device needs power supply to provide electric current for the output of its signal, passive transmission is realized on the basis of passive detection.
The technical scheme adopted by the utility model is that：Four cantilever beams are vertical two-by-two, are in crossing distribution, in every cantilever
The end of beam is fixedly connected with piezoelectric layer, free end has same matrix gauge block, and cantilever beam end is connected with support construction, matrix
Be fixedly connected with quality of assistance block immediately below gauge block, permanent magnet be fixedly connected with below quality of assistance block, the underface of permanent magnet,
It is fixedly connected with electromagnetic induction coil above support construction inner bottom surface, magnetic masking layer is with outside electromagnetic induction coil.
There are slots, the width of slot should be slightly bigger than the width of cantilever beam, the depth of slot below four cantilever beams for magnetic masking layer
It should be slightly bigger than when by the acceleration of Z-direction, maximum displacement of the cantilever beam in Z-direction.
The matrix gauge block should be greater than at a distance from magnetic masking layer by X, when the acceleration of Y direction, matrix amount
Block, quality of assistance block and permanent magnet are in X, the maximum displacement of Y direction；In the case where meeting above-mentioned requirements, matrix amount should be minimized
Block is at a distance from magnetic masking layer.
The magnetic masking layer is circular cylindrical cavity.
The utility model has the advantages that：Required magnet design is that three axis of piezoelectricity adds during electromagnetic vibration energy is acquired
A part for the matrix gauge block of cantilever beam in velocity sensor, the larger disadvantage of volume can be acquired by having evaded electromagnetic vibration,
Realize it is self-powered simultaneously, whole device volume has no too big variation.The self-powered 3-axis acceleration that the utility model is proposed
Sensor provides understanding for the passive detection and transmission of ICP (Integrated circuits piezoelectric) sensor
Certainly scheme.Meanwhile processing technology is simple, device overall structure is easily realized, at low cost, can be mass.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the sectional view of the utility model；
Fig. 3 is the sectional view of the utility model；
Fig. 4 is the detection method schematic diagram based on magnetic disturbance numerical compensation of the utility model.
Specific implementation mode
As shown in Figure 1, 2, including：Cantilever beam 1, piezoelectric layer 2, matrix gauge block 3, quality of assistance block 4, permanent magnet 5, electromagnetism sense
Answer coil 6, magnetic masking layer 7 and support construction 8.
Four cantilever beams 1 are vertical two-by-two, are in crossing distribution, connect as shown in Figure 1, being fixed in the end of every cantilever beam 1
Piezoelectric layer 2, free end are connected to same matrix gauge block 3, cantilever beam 1 is integrated with matrix gauge block 3 and is process, cantilever beam 1
End is connected with support construction 8, and cantilever beam 1 can be by being integrally machined with support construction 8；When cantilever beam 1 and support construction 8 select
When with different materials, 1 end of cantilever beam, which can be bolted, to be fixed in support construction, and bolt material therefor is nonmagnetic
Insulating materials such as nylon (Polyamide, PA) etc.；
The underface of matrix gauge block 3 is fixedly connected with quality of assistance block 4, and 4 lower section of quality of assistance block is fixedly connected with permanent magnet 5；
It is fixedly connected with electromagnetic induction coil 6 above the underface of permanent magnet 5,8 inner bottom surface of support construction, in electromagnetic induction coil 6
It is with magnetic masking layer 7 outside.
For magnetic masking layer 7 there are slot below four cantilever beams 1, the width of slot should be slightly bigger than the width of cantilever beam 1, the depth of slot
Degree should be slightly bigger than when by the acceleration of Z-direction, maximum displacement of the cantilever beam 1 in Z-direction.
The matrix gauge block 3 should be greater than at a distance from magnetic masking layer 7 by X, when the acceleration of Y direction, matrix amount
Block 3, quality of assistance block 4 and permanent magnet 5 are in X, the maximum displacement of Y direction；In the case where meeting above-mentioned requirements, matrix should be minimized
Gauge block is at a distance from magnetic masking layer.
The permanent magnet 5 is neodymium iron boron (Nd2Fe14B) etc.；
The quality of assistance block 4 is the material that density is less than permanent magnet 5, such as organic glass (Polymethyl
Methacrylate, PMMA) etc.；Or the structure to be designed containing voided layer；Its act on be reduce barycenter so that when sensor by
To X, when the acceleration of Y direction, including matrix gauge block, the vibrational structure torsional amplitude including permanent magnet and quality of assistance block increases
Greatly.Advantage is when by X or Y direction acceleration, and the torsional amplitude of permanent magnet increases, production in electromagnetic induction coil
Raw induced current increases, so that sensor is by X, when Y-axis acceleration, can also acquire considerable electric energy.
6 material therefor of the electromagnetic induction coil is copper, aluminium etc.；When by the acceleration of Z-direction, permanent magnet can be
Z-direction moves, and makes to generate induced current in electromagnetic induction coil.
The specific location of the electromagnetic induction coil 6 can be looped around 5 surrounding of permanent magnet；Or apply at micro manufacturing field,
5 lower section of permanent magnet is fixedly connected in the form of planar coil.
The magnetic masking layer 7 is the higher material of magnetic conductivity, such as soft iron, silicon steel, permalloy etc.；
The magnetic masking layer 7 is circular cylindrical cavity.
Operation principle is：When by extraneous acceleration, 1 free end matrix gauge block of cantilever beam will produce vibration, correspondingly,
Cantilever beam 1 understands the pulling force or pressure by matrix gauge block, and the piezoelectric layer 2 on cantilever beam 1 will produce electric signal by piezoelectric effect, when
By Z-direction acceleration when, the stressing conditions of four cantilever beams 1 are identical, therefore the piezoelectric layer 2 on four cantilever beams 1 is defeated
The electric signal gone out is identical；When by the acceleration of X or Y direction, two cantilever beams 1 on direction axis are by along axis
The size in direction is identical, the opposite power in direction, while piezoelectric layer 2 on two cantilever beams 1 generates that size is identical, and direction is opposite
Electric signal, and another two cantilever beams 1 on the axis vertical with acceleration direction are by identical torsion, piezoelectric layer 2 has
Identical electric signal output passes through the piezoelectric signal u for exporting four cantilever beams 1 to the acceleration of any direction1(t),u2
(t),u3(t),u4(t) it is decoupled, to decomposite X, the corresponding acceleration of tri- axis of Y, Z；
Self-powered cell operation principle is：When by the acceleration of Z-direction, permanent magnet 5 can be vibrated in Z-direction,
Magnetic flux changes in the electromagnetic induction coil 6 of 5 lower section of permanent magnet, induced current is generated, when by X, the acceleration of Y direction
When spending, since quality of assistance block 4 reduces the barycenter of mass block, permanent magnet 5 can generate larger torsion, permanent magnetism in X, Y direction
Magnetic flux changes in the electromagnetic induction coil 6 of 5 lower section of body, generates induced current, the induced current of acquisition is stored into storage
In capacitance, when needing the signal transmission by detection, storage capacitor electric discharge exports stabling current, powers, will export for sensor
Signal condition is standard signal, and is transmitted to receiving terminal.
It is influenced since electromagnetic induction coil has acceleration transducer accuracy of detection, the utility model proposes a kind of bases
In the detection method of numerical compensation.According to principle of conservation of energy, the electric energy of electromagnetic induction coil acquisition, ignore air damping etc. because
Element is equal to acceleration transducer vibrational structure (four cantilever beams 1, piezoelectric layer 2, matrix gauge block 3, quality of assistance block 4, permanent magnet
5) kinetic energy lost.The electric energy expression formula of the acquisition of the kinetic energy and electromagnetic induction coil of vibrational structure is as follows：
M is the quality of vibrational structure in formula, and V is the speed of vibrational structure, and a is the acceleration measured, and i, R, L is respectively electricity
Induced current, internal resistance and the inductance generated in magnetic induction coil 6, t are the time.
To actual acceleration a0, by EDynamic 0=EIt is dynamic+ECoil, have：
I.e.：
By (3) formula it is found that solving actual acceleration a0(t) it needs to obtain a (t) and i (t), a (t) is decoupled by receiving terminal
The u received1(t),u2(t),u3(t),u4(t) four piezoelectric signals obtain；Induced current i (t) is then needed in self-powered power supply
It is transmitted before management circuit part rectification, is finally further calculated with a (t) signals of decoupling out, find out actual acceleration
a0(t)。
Claims (3)
1. a kind of self-powered 3-axis acceleration sensor, including：Cantilever beam, piezoelectric layer, matrix gauge block and support construction, wherein
Four cantilever beams are vertical two-by-two, are in crossing distribution, the end of every cantilever beam is fixedly connected with piezoelectric layer, free end has
Same matrix gauge block, cantilever beam end are connected with support construction, it is characterised in that：Auxiliary is fixedly connected with immediately below matrix gauge block
Mass block, quality of assistance block lower section is fixedly connected with permanent magnet, fixed above the underface of permanent magnet, support construction inner bottom surface to connect
It is connected to electromagnetic induction coil, magnetic masking layer is with outside electromagnetic induction coil.
2. a kind of self-powered 3-axis acceleration sensor according to claim 1, it is characterised in that：The magnetic masking layer exists
There are slot below four cantilever beams, the width of slot should be slightly bigger than the width of cantilever beam, and the depth of slot should be slightly bigger than by Z axis side
To acceleration when, maximum displacement of the cantilever beam in Z-direction.
3. a kind of self-powered 3-axis acceleration sensor according to claim 1, it is characterised in that：The magnetic masking layer
For circular cylindrical cavity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721630950.8U CN207742217U (en) | 2017-11-28 | 2017-11-28 | A kind of self-powered 3-axis acceleration sensor |
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| CN201721630950.8U CN207742217U (en) | 2017-11-28 | 2017-11-28 | A kind of self-powered 3-axis acceleration sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113680A (en) * | 2021-12-17 | 2022-03-01 | 上海凸申科技有限公司 | Piezoelectric film acceleration or vibration sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113680A (en) * | 2021-12-17 | 2022-03-01 | 上海凸申科技有限公司 | Piezoelectric film acceleration or vibration sensor |
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