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A study on the piezoelectric energy conversion system using motor vibration

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Abstract

This study is focused on the piezoelectric system to use a fixed frequency range from the real motion of motor for implementing wireless sensor network. The energy conversion system is made up of a cantilever beam including a piezoelectric mechanism. The natural frequency of the system is designed near the frequency range of external source. The design parameters are determined by FEM simulation of stress and strain distribution for various types of the beam configurations. The simulation and experimental results show that the generating power from the trapezoidal configuration is more efficient than that from the rectangular configuration. From the motor vibration (0.3g at 205Hz), the trapezoid energy harvesting module extracts power of 56uW with the load resistance of 800k. Then, a test applicable to the motor demonstrates that the conversed energy can be charged/discharged in a capacitor (22uF). Therefore, it is possible to power motor health monitoring with energy harvesting using motor vibration.

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Abbreviations

m:

mass

c:

damping coefficient

k:

spring coefficient

w:

excitation frequency

F0 :

amplitude of force

x(t):

displacement of beam’s tip

Y:

base displacement

wn :

natural frequency

wb :

excitation frequency

ζ:

damping ratio

cp :

elastic constant of the piezoelectric material

k31 :

piezoelectric coupling coefficient

tc :

thickness of one layer of the piezoelectric material

k2 :

geometric constant that relates average piezoelectric material strain to the tip deflection

ɛ:

dielectric constant of piezoelectric material

R:

load resistance

V:

voltage across the load resistance

Cb :

capacitance of the piezoelectric birmorph

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sogang University, 1 Sinsu-dong, Mapo-gu, Seoul, Republic of Korea, 121-742

    Jaeyun Lee & Bumkyoo Choi

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  1. Jaeyun Lee
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  2. Bumkyoo Choi
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Correspondence to Bumkyoo Choi.

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Lee, J., Choi, B. A study on the piezoelectric energy conversion system using motor vibration. Int. J. Precis. Eng. Manuf. 13, 573–579 (2012). https://doi.org/10.1007/s12541-012-0073-8

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  • DOI: https://doi.org/10.1007/s12541-012-0073-8

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