Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Study on Design and Driving Characteristics of T-Shaped Piezoelectric Actuators

T형상 압전 엑추에이터의 설계 및 구동특성 연구

  • Kim, Tae-Hoon (Department of Electrical Engineering, Changwon National University) ;
  • Park, Min-Ho (Defense Agency for Technology and Quality) ;
  • Jeong, Seong-Su (Department of Electrical Engineering, Changwon National University) ;
  • Jun, Ho-Ik (Department of Electrical Engineering, Changwon National University) ;
  • Cheon, Seong-Kyu (Department of Electrical Engineering, Changwon National University) ;
  • Park, Tae-Gone (Department of Electrical Engineering, Changwon National University)
  • Received : 2018.08.30
  • Accepted : 2018.09.28
  • Published : 2019.01.01
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Abstract

A newly proposed T-shape piezoelectric actuator, composed of piezoelectric benders, was designed and studied. This actuator has four legs, and can walk in both forward and backward directions. The piezoelectric actuator has a simple structure and can be easily fabricated. It consists of a piezoelectric bender and a joint. The piezoelectric bender is composed of carbon and ceramic materials. Therefore, there is an advantage in that it can be fabricated on a very small scale. Elliptical displacements of the piezoelectric actuators were analyzed by finite element analysis. Elliptical motion at the tip occurred at two voltages having a 90-degree phase difference. Based on the finite element analysis results, prototype actuators with maximum displacements were fabricated, and the characteristics of their movements were characterized.

Keywords

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Fig. 1. Structure of the T-shaped.

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Fig. 2. Driving principle of the T-type actuator. (a) Displacement of piezoelectric benders and (b) phase difference of applied voltage.

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Fig. 3. Parameters of piezoelectric bender.

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Fig. 4. Displacement characteristics according to elastic body material.

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Fig. 5. Displacement characteristics depending on the elastic bodythickness.

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Fig. 6. Displacement characteristics depending on the piezoelectricbender width.

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Fig. 7. T-type actuator fabrication and driving system.

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Fig. 8. Speed of T-type actuator depending on voltage.

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Fig. 9. Speed of T-type actuator depending on load.

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Fig. 10. Speed of T-type ambulatory robot depending on surface.

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Fig. 11. The speed of T-type ambulatory robot depending onangle of slope.

Table 1. Parameters of piezoelectric bender.

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References

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