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Generating Characteristics of a Cantilever Type Piezoelectric Generator for Changeable Frequency

주파수 가변용 외팔보형 압전발전기의 발전특성

  • Jeong, Seong-Su (Department of Electrical Engineering, Changwon National University) ;
  • Park, Choong-Hyo (Department of Electrical Engineering, Changwon National University) ;
  • Kang, Shin-Chul (Department of Electricity, Gyeongnam Provincial Namhae College) ;
  • Kim, Jong-Wook (Department of Electrical Engineering, Changwon National University) ;
  • Lim, Jung-Hoon (Department of Electrical Engineering, Changwon National University) ;
  • Kim, Myong-Ho (Department of Electrical Engineering, Changwon National University) ;
  • Park, Tae-Gone (Department of Electrical Engineering, Changwon National University)
  • Received : 2011.09.30
  • Accepted : 2011.10.21
  • Published : 2011.11.01

Abstract

A cantilever-type piezoelectric generator has advantages of simple structure, ease of fabrication and large displacement by transverse vibration of a beam. It is easy to control the natural frequency, and also possible to increase the output power by changing the length, width, and thickness of the generator. In particular, the length increases, the natural frequency sharply decreases, and vice versa. Hence, the natural frequency can widely be controlled by using change in the length of elastic body. In this paper, the generator was designed and fabricated to change natural frequency using the slides of the case. In addition, the generating characteristics were confirmed through finite element analyses and vibration experiment. As a result, the maximum output characteristics could be generated due to resonance phenomenon although any frequency of external force was applied.

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