CN202713190U - Piezoelectric/electromagnetic combined-type micro energy device - Google Patents
Piezoelectric/electromagnetic combined-type micro energy device Download PDFInfo
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- CN202713190U CN202713190U CN 201220426332 CN201220426332U CN202713190U CN 202713190 U CN202713190 U CN 202713190U CN 201220426332 CN201220426332 CN 201220426332 CN 201220426332 U CN201220426332 U CN 201220426332U CN 202713190 U CN202713190 U CN 202713190U
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Abstract
The utility model relates to a piezoelectric/electromagnetic combined-type micro energy device. According to an existing device, a mass block itself does not generate power, which can decrease the density of output power. The combined-type micro energy device of the utility model comprises a base, a piezoelectric power-generating set and a magnetic power-generating set. The piezoelectric power-generating set comprises a substrate two surfaces of which are provided with piezoelectric sheets, and external surfaces of the piezoelectric sheets are clad with metal electrode layers. The magnetic power-generating set comprises iron cores and magnets; enameled wires are wrapped on the exteriors of the iron cores; and either the iron cores or the magnets are fixedly arranged at a lower surface of a free end of the substrate, the iron cores or the magnets are arranged on a horizontal bottom base in pairs. The piezoelectric power-generating set generates power through the bending deformation of the piezoelectric sheets, and the magnetic power-generating set generates power through cutting magnetic force lines. According to the piezoelectric/electromagnetic combined-type micro energy device of the utility model, based on full consideration of the structure of a piezoelectric type micro energy device, an electromagnetic-type micro energy device is integrated on the piezoelectric type micro energy device, which forms the micro energy device enabling a mass block itself to generate power, thereby increasing the density of output power.
Description
Technical field
The utility model belongs to the piezo technology field, relates to the little energy source device of a kind of piezoelectricity electromagnetism combined type, specifically a kind of device of the energy being provided for the various Embedded micro-systems such as sensor-based system, actuating system, intelligence system.
Background technology
Little energy source device is a kind of by automatically gathering the vibrational energy in the environment, supply with the device of electronic circuit energy, can be used for the distributed sensor system of the biology sensor of implant into body, the tire pressure monitoring system that places automobile tire inside, factory's motor etc.Utilize the vibrational energy of environment to come little energy source device to system power supply, have the time-independent characteristics of output power density with respect to traditional lithium battery, as: used 1 year, the decline output power density of energy source device of piezoelectricity is 250 μ W/ cm
3, the decline output power density of energy source device of electromagnetism is 10 μ W/cm
3, the output power density of rechargeable lithium ion batteries is not 45 μ W/ cm
3Used 10 years, the output power density of piezoelectric micromotor energy source device still is 250 μ W/ cm
3, the decline output power density of energy source device of electromagnetism still is 10 μ W/cm
3, the output power density of not chargeable Li ion battery then is 35 μ W/ cm
3Therefrom can find out, the passing in time of the output power density of lithium ion battery can reduce.Gather ambient vibration can little energy source device then not can, decline the output power density of energy source device for the highest with piezoelectricity simultaneously.At present the piezoelectricity energy source device that declines mostly is suspension beam structure, usually on the overarm top mass is set, to reduce its frequency.But itself does not generate electricity mass, can reduce output power density.
Summary of the invention
The purpose of this utility model overcomes the deficiencies in the prior art exactly, and a kind of little energy source device of piezoelectricity electromagnetism combined type of high-output power density is provided, and is adapted at using in the systems such as biology sensor, tire pressure monitoring, motor detection.
The utility model comprises pedestal, piezo-electric generating group and magnetic generating set.
The cross section of described pedestal is L shaped, comprises horizontal base and vertically is arranged on piezo-electric generating group mount pad on the horizontal base.
Described piezo-electric generating group comprises substrate, piezoelectric patches and metal electrode layer, and the stiff end of substrate is fixedly installed on the piezo-electric generating group mount pad, free end is unsettled; Described substrate is the sheet metal of strip, adopts elastic metallic material; The two sides of substrate is respectively arranged with piezoelectric patches, and the one side of piezoelectric patches is fixedly connected with substrate, and another side is covered with metal electrode layer; Be connected with piezo-electric generating group positive wire on the metal electrode layer, be connected with piezo-electric generating group negative wire on the substrate.
Described magnetic generating set comprises iron core and magnet, and iron core is tied with enamelled wire outward, and two of enamelled wire is connected with respectively magnetic generating set positive wire and magnetic generating set negative wire; Magnetic generating set positive wire is connected with piezo-electric generating group positive wire, as the positive wire of little energy source device; Magnetic generating set negative wire is connected with piezo-electric generating group negative wire, as the negative wire of little energy source device.
Described iron core or magnet are fixedly installed on the free-ended lower surface of substrate; If iron core is fixed on the substrate, two magnet are fixedly installed on the horizontal base, and two magnet divide and be located at the both sides of iron core in the horizontal base projection, and when iron core runs to when minimum, the coil on the iron core is between two magnet fully; If magnet is fixed on the substrate, two iron cores are fixedly installed on the horizontal base, and two iron cores divide and be located at the both sides of magnet in the horizontal base projection, and when magnet runs to when minimum, magnet is between two coils on the iron core fully.
The material of described substrate is phosphor bronze, and the material of described piezoelectric patches is doped PZT pottery or ZnO or AlN or PVDF.
During work, the free end of substrate is in the situation that stressed or resonance moves up and down, and the deformation that bends of the piezoelectric patches of piezo-electric generating group produces electric charge; The magnetic generating set generates electricity by cutting magnetic line simultaneously; Be arranged on the free-ended iron core of substrate or magnet as the mass of piezo-electric generating group, increased the piezoelectric patches degree of crook.
The utility model declines on the basis of energy source device structure taking into full account piezoelectricity, proposes on piezoelectricity declines energy source device the composite electromagnetic energy source device that declines, and little energy source device that mass itself is also generated electricity has improved the output power density of device.
Description of drawings
Fig. 1 is the side structure schematic diagram of an embodiment of the utility model;
Fig. 2 is the Facad structure schematic diagram of Fig. 1;
Fig. 3 is the side structure schematic diagram of another embodiment of the utility model;
Fig. 4 is the Facad structure schematic diagram of Fig. 2.
Embodiment
Embodiment 1.
As illustrated in fig. 1 and 2, the little energy source device of piezoelectricity electromagnetism combined type comprises pedestal, piezo-electric generating group and magnetic generating set.
The cross section of pedestal is L shaped, comprises horizontal base 1-1 and vertically is arranged on the piezo-electric generating group mount pad 1-2 of 1-1 on the horizontal base.
The piezo-electric generating group comprises substrate 2, piezoelectric patches and metal electrode layer, and the stiff end of substrate 2 is fixedly installed on the piezo-electric generating group mount pad 1-2, free end is unsettled.Substrate is the sheet metal of strip, adopts elastic metallic material, such as the phosphor bronze material.The two sides of substrate is respectively arranged with piezoelectric patches 3-1 and 3-2, and piezoelectric patches adopts the doped PZT material, and one side is fixedly connected with substrate 2, and another side is covered with respectively metal electrode layer 4-1 and 4-2.Be connected with piezo-electric generating group positive wire on metal electrode layer 4-1 and the 4-2, be connected with piezo-electric generating group negative wire on the substrate 2.
The magnetic generating set comprises iron core 5 and magnet 7, is tied with enamelled wire 6 outside the iron core 5, and two of enamelled wire is connected with respectively magnetic generating set positive wire and magnetic generating set negative wire; Magnetic generating set positive wire is connected with piezo-electric generating group positive wire, as the positive wire of little energy source device; Magnetic generating set negative wire is connected with piezo-electric generating group negative wire, as the negative wire of little energy source device.
Shown in Fig. 3 and 4, the little energy source device of piezoelectricity electromagnetism combined type comprises pedestal, piezo-electric generating group and magnetic generating set.
The cross section of pedestal is L shaped, comprises horizontal base 1-1 and vertically is arranged on the piezo-electric generating group mount pad 1-2 of 1-1 on the horizontal base.
The piezo-electric generating group comprises substrate 2, piezoelectric patches and metal electrode layer, and the stiff end of substrate 2 is fixedly installed on the piezo-electric generating group mount pad 1-2, free end is unsettled.Substrate is the sheet metal of strip, adopts elastic metallic material, such as the phosphor bronze material.The two sides of substrate is respectively arranged with piezoelectric patches 3-1 and 3-2, and piezoelectric patches adopts the doped PZT material, and one side is fixedly connected with substrate 2, and another side is covered with respectively metal electrode layer 4-1 and 4-2.Be connected with piezo-electric generating group positive wire on metal electrode layer 4-1 and the 4-2, be connected with piezo-electric generating group negative wire on the substrate 2.
The magnetic generating set comprises iron core 5 and magnet 7, is tied with enamelled wire 6 outside the iron core 5, and two of enamelled wire is connected with respectively magnetic generating set positive wire and magnetic generating set negative wire; Magnetic generating set positive wire is connected with piezo-electric generating group positive wire, as the positive wire of little energy source device; Magnetic generating set negative wire is connected with piezo-electric generating group negative wire, as the negative wire of little energy source device.
Among the embodiment 1 and 2, the ratio of the length of substrate, width, thickness is a:b:c=20～40:5:1; Piezoelectric patches is d:e=2:2.2～3.5 with the Length Ratio of substrate, and Thickness Ratio is f:g=2～4:1; Magnet is x:y=1:0.98 to the ratio of the width of the same iron-core coil of distance (or magnet) of (or iron core to).The height of magnet and the aspect ratio of iron-core coil are z:w=1:1.
Operation principle of the present utility model and the course of work:
For the piezoelectric electro magnetic-type compound micro-energy device in the utility model, its free-ended amount of deflection W is with satisfying following relational expression between the free end applied force F:
Wherein EI is equivalent bending stiffness.
Definition stiffness coefficient Ku
Consider that equivalent bending stiffness EI is:
Wherein Ep is the piezoelectric layer modulus of elasticity, and Em is the substrate modulus of elasticity, and b is width, and tp is piezoelectric layer thickness, and tm is substrate thickness.
Can draw the unidimensional functional relation of stiffness coefficient by above three formulas is:
The expression formula of considering frequency is:
Then in the situation that consider frequency and rigidity, can determine the size of piezoelectric layer and substrate.
Simultaneously, consider that the piezoelectric micromotor energy source electric generating device has based on d31 and two kinds of patterns of d33, the electric charge that produces during its generating is with being described by following relational expression between the voltage:
Q=C
totalV
Total capacitance C
TotalInclude piezoelectric layer intrinsic capacity C
0With the piezoelectric response capacitor C
e
The peak power output of piezoelectric micromotor energy source electric generating device is:
R
0Be intrinsic resistance;
For the piezoelectric micromotor energy source electric generating device based on the d33 pattern, the intrinsic capacity C of its piezoelectric layer
0Can be expressed as:
Wherein
Be the thickness of piezoelectric layer,
Dielectric constant for electricity electric capacity.
For the electrode logarithm be n based on d33 call by pattern piezoelectric micromotor energy source electric generating device, the expression formula of its piezoelectric response electric capacity is:
Equally, for based on d33 call by pattern piezoelectric micromotor energy source electric generating device, the expression formula of its intrinsic resistance is:
And same, for the piezoelectric micromotor energy source electric generating device based on the d31 pattern, the intrinsic capacity C of its piezoelectric layer
0Can be expressed as:
The expression formula of its intrinsic resistance is:
Under the condition of considering certain stiffness coefficient, can obtain the concrete size of substrate and piezoelectric layer.
During work, the substrate free end is wound with the iron core of enamelled wire by the right magnetic field of magnet in the situation that stressed or resonance moves up and down, and cutting magnetic line will have alternating current output in the enamelled wire; The piezoceramics layer Bending Deformation causes the change of piezoelectric ceramic surface bound charge simultaneously.The piezoelectric ceramic surface bound charge changes, and can cause the variation of electric field, promotes the movement of free electron, and this moment, the piezoelectric ceramic two ends had the indefinite alternating current output of peak value.The alternating current of output is stored after rectification, filtering and can supply with electronic installation.
Claims (2)
1. the little energy source device of piezoelectricity electromagnetism combined type comprises pedestal, piezo-electric generating group and magnetic generating set, it is characterized in that:
The cross section of described pedestal is L shaped, comprises horizontal base and vertically is arranged on piezo-electric generating group mount pad on the horizontal base;
Described piezo-electric generating group comprises substrate, piezoelectric patches and metal electrode layer, and the stiff end of substrate is fixedly installed on the piezo-electric generating group mount pad, free end is unsettled; Described substrate is the sheet metal of strip, adopts elastic metallic material; The two sides of substrate is respectively arranged with piezoelectric patches, and the one side of piezoelectric patches is fixedly connected with substrate, and another side is covered with metal electrode layer; Be connected with piezo-electric generating group positive wire on the metal electrode layer, be connected with piezo-electric generating group negative wire on the substrate;
Described magnetic generating set comprises iron core and magnet, and iron core is tied with enamelled wire outward, and two of enamelled wire is connected with respectively magnetic generating set positive wire and magnetic generating set negative wire; Magnetic generating set positive wire is connected with piezo-electric generating group positive wire, as the positive wire of little energy source device; Magnetic generating set negative wire is connected with piezo-electric generating group negative wire, as the negative wire of little energy source device;
Described iron core or magnet are fixedly installed on the free-ended lower surface of substrate; If iron core is fixed on the substrate, two magnet are fixedly installed on the horizontal base, and two magnet divide and be located at the both sides of iron core in the horizontal base projection, and when iron core runs to when minimum, the coil on the iron core is between two magnet fully; If magnet is fixed on the substrate, two iron cores are fixedly installed on the horizontal base, and two iron cores divide and be located at the both sides of magnet in the horizontal base projection, and when magnet runs to when minimum, magnet is between two coils on the iron core fully.
2. the little energy source device of a kind of piezoelectricity electromagnetism combined type as claimed in claim 1, it is characterized in that: the material of described substrate is phosphor bronze, the material of described piezoelectric patches is doped PZT pottery or ZnO or AlN or PVDF.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201220426332 CN202713190U (en) | 2012-08-27 | 2012-08-27 | Piezoelectric/electromagnetic combined-type micro energy device |
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| CN 201220426332 CN202713190U (en) | 2012-08-27 | 2012-08-27 | Piezoelectric/electromagnetic combined-type micro energy device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820805A (en) * | 2012-08-27 | 2012-12-12 | 杭州电子科技大学 | Piezoelectric and electromagnetic combined micro-energy resource device |
| CN103178744A (en) * | 2013-03-26 | 2013-06-26 | 北京大学 | Composite nano generator based on piezoelectric friction electromagnetism |
| CN103343725A (en) * | 2013-07-22 | 2013-10-09 | 哈尔滨工业大学 | Composite rainwater power generation device based on mini water bucket and PVDF film piezoelectric technology |
| CN103795149A (en) * | 2014-03-04 | 2014-05-14 | 镇江博联电子科技有限公司 | Energy accumulation method and device based on piezoelectric materials for wearable electronic product |
| CN105634205A (en) * | 2016-03-25 | 2016-06-01 | 吉林大学 | Micro piezoelectric-electromagnetic composite power generation device |
| TWI566511B (en) * | 2015-12-03 | 2017-01-11 | 財團法人工業技術研究院 | Piezoelectric generator |
| CN108023501A (en) * | 2017-12-28 | 2018-05-11 | 西华师范大学 | A kind of combined-type magnetic suspension wideband vibration energy collector using structure for amplifying |
| CN108540014A (en) * | 2018-05-14 | 2018-09-14 | 中国科学院上海微系统与信息技术研究所 | A kind of low frequency flexible energy collector and self energizing motion counter |
-
2012
- 2012-08-27 CN CN 201220426332 patent/CN202713190U/en not_active Withdrawn - After Issue
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820805A (en) * | 2012-08-27 | 2012-12-12 | 杭州电子科技大学 | Piezoelectric and electromagnetic combined micro-energy resource device |
| CN102820805B (en) * | 2012-08-27 | 2015-05-20 | 杭州电子科技大学 | Piezoelectric and electromagnetic combined micro-energy resource device |
| CN103178744A (en) * | 2013-03-26 | 2013-06-26 | 北京大学 | Composite nano generator based on piezoelectric friction electromagnetism |
| CN103343725A (en) * | 2013-07-22 | 2013-10-09 | 哈尔滨工业大学 | Composite rainwater power generation device based on mini water bucket and PVDF film piezoelectric technology |
| CN103343725B (en) * | 2013-07-22 | 2015-08-19 | 哈尔滨工业大学 | Based on the compound power generation apparatus by rainwater of miniature bucket and pvdf membrane piezo technology |
| CN103795149A (en) * | 2014-03-04 | 2014-05-14 | 镇江博联电子科技有限公司 | Energy accumulation method and device based on piezoelectric materials for wearable electronic product |
| CN103795149B (en) * | 2014-03-04 | 2016-11-02 | 镇江博联电子科技有限公司 | Energy storage method based on piezoelectric and device for Wearable electronic product |
| TWI566511B (en) * | 2015-12-03 | 2017-01-11 | 財團法人工業技術研究院 | Piezoelectric generator |
| CN105634205A (en) * | 2016-03-25 | 2016-06-01 | 吉林大学 | Micro piezoelectric-electromagnetic composite power generation device |
| CN108023501A (en) * | 2017-12-28 | 2018-05-11 | 西华师范大学 | A kind of combined-type magnetic suspension wideband vibration energy collector using structure for amplifying |
| CN108540014A (en) * | 2018-05-14 | 2018-09-14 | 中国科学院上海微系统与信息技术研究所 | A kind of low frequency flexible energy collector and self energizing motion counter |
| CN108540014B (en) * | 2018-05-14 | 2020-03-24 | 中国科学院上海微系统与信息技术研究所 | Low-frequency flexible energy collector and self-powered motion counter |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130130 Effective date of abandoning: 20150520 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130130 Effective date of abandoning: 20150520 |
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