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A Dumbbell-shaped Piezoelectric Force-Electric Transducer

A dumbbell-shaped, transducer technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc., can solve the problem of low output energy density, piezoelectric materials prone to micro Cracks, short working life and other problems, to achieve the effect of increasing service life, improving electrical output performance, and high output power density

Active Publication Date: 2022-06-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a dumbbell-shaped piezoelectric force-electric transducer, which solves the problems of low output energy density, short working life and easy generation of piezoelectric materials in existing piezoelectric force-electric transducers. The problem with microcracks

Method used

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  • A Dumbbell-shaped Piezoelectric Force-Electric Transducer
  • A Dumbbell-shaped Piezoelectric Force-Electric Transducer
  • A Dumbbell-shaped Piezoelectric Force-Electric Transducer

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Effect test

Embodiment 1

[0060] Specifically, the vibration of the dumbbell-shaped force-electric transducer mass around the Z axis is defined as the transverse vibration mode, and the vibration of the mass mass around the Y axis is defined as the longitudinal vibration mode. The relationship between the output voltage and the vibration frequency when two piezoelectric stacks are electrically connected in series is as follows: Image 6 shown. The transverse vibration frequency of the dumbbell-shaped force-electric transducer is 350 Hz, and the longitudinal vibration frequency is 390 Hz. Since half of the piezoelectric material is in compression and half in tension at the transverse vibration frequency, the signs of the charges generated by the strain are opposite, and the output charge is lower after mutual neutralization, so the output voltage is much lower than that at the longitudinal vibration frequency. In this example, the output current of a single piezoelectric stack of the dumbbell-type forc...

Embodiment 2

[0070] Specifically, the open-circuit output voltage and output power test results of the all-electrode and split-electrode energy recovery devices are as follows: Figure 11 shown. It can be seen that the first-order bending mode resonance of the force-electric transducer occurs at a frequency of 60 Hz, and the open-circuit output voltage is the largest. Transducer-like 6.6V p-p , and the output voltage value increases linearly with the acceleration, and the output voltage of the all-electrode transducer is 15.37V when the acceleration is 2.5g. p-p , Separate electrode transducer sample is 26.4V p-p . Therefore, the electrode division can indeed avoid the neutralization of positive and negative charges and increase the output open circuit voltage value. exist Figure 11 The output power changes with the load impedance under 1g acceleration, the external resistance is from 0.05MΩ to 6MΩ, the maximum output power of the full-electrode transducer is 15.78μW when the externa...

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Abstract

A dumbbell-shaped piezoelectric force-electric transducer provided by the present invention includes a frame, a piezoelectric material, a screw and a mass block, wherein the piezoelectric material is provided with a plurality of piezoelectric materials along the circumference The directions are evenly distributed in the frame; one end of the screw is connected to the frame, and the other end is connected to the mass block; compared with the traditional cantilever beam force-electric transducer, since the piezoelectric material is in a clamped state, it works in 33 modes , only bears normal stress, so the piezoelectric material is not easy to crack, so the stability of the transducer with this structure is higher. Compared with the traditional 31-mode cantilever beam transducer, its service life will be significantly improved.

Description

technical field [0001] The invention relates to the field of transducers, in particular to a dumbbell-type piezoelectric force-electric transducer. Background technique [0002] In recent years, with the continuous maturity of microelectronic technology and digital system integration technology, wireless sensor technology, portable electronic devices, wearable electronic devices, and Internet of Things technologies have developed rapidly. Currently, these microelectronic devices are generally powered by chemical batteries. However, chemical batteries have shortcomings such as short lifespan, poor temperature stability, difficult replacement and high cost, which seriously hinder the further development of such devices. Therefore, self-powered devices that can harvest energy such as heat, light, magnetism, and mechanical vibration from the natural environment have become a current research focus and are expected to replace traditional chemical batteries. Among these renewabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/18
CPCH02N2/18H02N2/186H02N2/188
Inventor 高翔宇刘金凤李飞邱超锐乔辽杨帅王明文徐卓
Owner XI AN JIAOTONG UNIV
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