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Magnetic/piezoelectric broadband vibration energy collector

A vibration energy harvesting, piezoelectric transducer technology, applied in generators/motors, piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, etc. Short and other problems, to achieve the effect of improving conversion efficiency, improving frequency response bandwidth, and good linearity

Active Publication Date: 2015-07-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of the battery: short life, limited storage capacity, and great harm to the environment; disadvantages of the power supply line: high cost, difficult to replace, and unusable in special environments, etc.
No matter what the binder is, it will cause a large loss of energy, which directly affects the conversion efficiency of the transducer, and also becomes the main obstacle to making a high-sensitivity, high-efficiency piezoelectric transducer.

Method used

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  • Magnetic/piezoelectric broadband vibration energy collector
  • Magnetic/piezoelectric broadband vibration energy collector
  • Magnetic/piezoelectric broadband vibration energy collector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0037] Such as figure 2 As shown: the magnetic circuit mechanism 3 and the cantilever beam 4 are connected into one body to form the main vibration mechanism, and the cantilever beam 4 is fastened to the bracket I1-8 with fastening strips 1-2, and the magnet / piezoelectric transducer 2 Place it on the drag table 1-4, adjust the height of the drag table 1-4 and the position of the magnetic circuit drag table 3-2, so that the magnet / piezoelectric transducer 2 is in the geometric center of the air gap of the magnetic circuit mechanism 3, and the overall force is applied balance. Specifically, the length of the cantilever beam 4 is adjusted so that the frequency of the main vibration mechanism during vibration is similar to the frequency of external vibration, so that its resonance can achieve the best output effect. When the energy harvester feels the vibration in the external environment and the magnet / piezoelectric transducer 2 is relatively displaced, a changed external magne...

Embodiment approach 2

[0039] Such as figure 1 As shown: the magnet / piezoelectric transducer 2 and the cantilever beam 4 (plus mass) together form the main vibration mechanism, which is fastened on the support I1-8. According to the vibration characteristics in the environment, the length of the cantilever beam 4 and the weight of the mass block 5 are adjusted to achieve resonance, that is, the output reaches the maximum value. The magnetic circuit is symmetrically placed on the drag table 1-4, and the bracket II 1-3 is adjusted so that the magnet / piezoelectric transducer 2 can be at the geometric center of the air gap of the magnetic circuit mechanism 3, so that the magnet / piezoelectric transducer 2 is in static state force balance. The mechanical-magnetic-electrical conversion principle of the second scheme is the same as that of the first scheme, except that the main vibration structure becomes the magnet / piezoelectric transducer 2 and the cantilever beam 4 .

Embodiment approach 3

[0041] Such as image 3 As shown: the magnet / piezoelectric transducer 2 and the cantilever beam, the magnetic circuit mechanism 3 and the cantilever beam together form the main vibration mechanism, forming a transducer with a double-arm structure. The conversion principle of Scheme 3 is the integration of Scheme 1 and Scheme 2. When external vibration is excited, the transducer with double-arm structure has the adaptability to the environmental vibration frequency, which further improves the frequency response bandwidth of the transducer.

[0042] In the present invention, the gap between the magnetic circuit and the transducer can be adjusted according to the strength of the vibration in the environment so as to achieve the best output effect. The resonance frequency of the energy harvester is adjustable, and the length of the cantilever beam and the weight of the mass block can be changed to be similar to the frequency of external vibration, so that the resonance can achieve...

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PUM

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Abstract

The invention discloses a magnetic / piezoelectric broadband vibration energy collector. The magnetic / piezoelectric broadband vibration energy collector comprises a supporting mechanism, a magnetic path mechanism, a magnetic / piezoelectric transducer and a cantilever beam. The magnetic / piezoelectric transducer is located in air gap magnetic field space of the magnetic path mechanism, and the magnetic path mechanism or / and the magnetic / piezoelectric transducer are connected with the supporting mechanism through the cantilever beam. When the energy collector senses vibration in an external environment, the magnetic / piezoelectric transducer conducts reciprocating motion in the air gap magnetic field space of the magnetic path mechanism, and therefore electric output is generated. The energy collector is suitable for weak-vibration and high in magnetic-electric conversion efficiency, and frequency bandwidths of energy collecting response are widened.

Description

technical field [0001] The invention relates to the field of converting mechanical energy into electrical energy output, in particular to a magnet / piezoelectric-based broadband vibration energy harvester. Background technique [0002] The continuous advancement of semiconductor manufacturing technology has led to the miniaturization of electronic devices and products. The emergence of Bluetooth technology and low-power communication standards (such as Zigbee and IEEE802.15.4) has largely promoted the development of miniature wireless sensor networks and communication nodes. Research. Due to its low power consumption, small size, good performance, and mass production, MEMS is developing rapidly. However, compared with the size reduction of wireless sensing products and MEMS devices, power supply has become a great obstacle to their development. Powering these systems currently relies primarily on batteries and power lines. Disadvantages of the battery: short life, limited ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/18
Inventor 邱景陈恒佳文玉梅李平
Owner CHONGQING UNIV
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