• Title, Summary, Keyword: Piezoelectric actuator

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Design and Characteristics of a Monolithic Inchworm Type Actuator (MITA) (일체형 인치웜 방식 액추에이터의 설계 및 특성)

  • Kang, Hyung-Won;Lee, Hyeong-Gyu
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.44-44
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    • 2007
  • New inchworm type piezoelectric actuator design, which can reduce the number of the piezoelectric body for manufacturing inchworm type actuator, is suggested in this work. Inchworm type actuator consists of three or more piezoelectric bodies, on the other hand the new-designed inchworm type actuator has only one piezoelectric body. The one piezoelectric body that size is $2\;{\times}\;2\;{\times}\;4\;[mm^2]$ (DWL) has 2 clamping part and 1 extending part. The size of the new-designed actuator with one piezoelectric body is $5\;{\times}\;6\;{\times}\;9\;[mm^2]$ (DWL). The new-designed inchworm type actuator performed the operation at a cycle (6 steps) of $0.3{\mu}m$ per $33.3{\mu}s$ and a generated force of 0.6N.

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Finite Element Analysis of A Piezoelectric Actuator (압전 작동기 거동해석을 위한 유한요소 모사)

  • Lee, Heung-Shik;Cho, Chong-Du
    • Proceedings of the KSME Conference
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    • pp.1401-1406
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    • 2003
  • Mechanical behavior of a piezoelectric actuator is studied as a preceding research for the manufacturing of three-dimensional micro-structures. It is needed to examine the simulation of a piezoelectric actuator according to applied direction of voltage, by researching displacement characterization of piezoelectric material through piezoelectric theory. To this end, finite element modeling is employed to study the response of a piezoelectric material under the various input voltages. Where the actuator is simulated by use of ANSYS. To avoid direct contact piezoelectric material with working fluid, silicon, polymer, etc., the actuator is modeled with nickel fixed diaphragm.

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Simulation and Design of a Multilayer Piezoelectric Actuator

  • Lee, Kabsoo;Yoo, Juhyun;Lee, Sangho;Hong, Jaeil
    • Transactions on Electrical and Electronic Materials
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    • v.18 no.3
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    • pp.144-147
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    • 2017
  • In this study, two- and three-layer ceramic piezoelectric actuators were designed and simulated according to SUS316 thickness, actuator width, and mass using ATILA software in order to develop a piezoelectric actuator for haptic application. Numerical modelling based on the finite element method was performed to find the resonance frequencies and modal shapes of the actuator. The resonance frequency was affected by the thickness of the SUS316 plate and mass. On the other hand, the width of the actuator did not have a significant impact. Maximum displacements were generated at the center of a haptic three-layer ceramic piezoelectric actuator. The two-layer ceramic piezoelectric actuator with a mass of 2.6 g was suitable as $16.28{\mu}m$ at 265 Hz for haptic sensation application.

ELECTROMECHANICAL ANALYSIS OF PIEZOELECTRIC STACK ACTUATOR (적층 압전 액추에이터의 전기-기계적 특성 분석)

  • Ha, Gi Hong;Lee, Soo Il
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.374-378
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    • 2014
  • The piezoelectric materials convert from mechanical energy to electrical energy. The piezoelectric materials are used in various engineering applications such as piezoelectric ultrasonic actuators. Since the piezoelectric coupling characteristics of the actuator systems should be considered at the initial design stage, it is essential to analyze the piezoelectric coupling characteristics of the ultrasonic actuators. In this study, we analyzed the electromechanical characteristics of piezoelectric stacked actuator using the equivalent circuit model with modal mass stiffness parameters. It was compared the admittance of piezoelectric stack actuators with the analytical circuit model and the finite element model. Also, the coupling coefficient of piezoelectric stack actuator was discussed according to the number of stacks of actuators.

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Performance Evaluation for Piezoelectric Unimorph Actuator with Stress Distribution (응력 분포에 따른 압전 유니모프 작동기의 성능 평가)

  • Lee, Jong-Won;Kang, Lae-Hyoung;Han, Jae-Hung;Jung, Sang-Jun;Ko, Han-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.127-131
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    • 2008
  • This paper deals with the performance evaluation of piezoelectric unimorph actuator. In the unimorph design, the thickness ratio of substrate to piezoelectric material and the elastic modulus ratio of substrate to piezoelectric material are important parameters. There exists only one structural configuration that satisfies the optimal condition among them, and actuators using that configuration exhibit better actuating displacements. Another design parameter is the piezoelectric coefficient which can be improved due to the induced tensile stress and voltages. The application of the tensile stress to the piezoelectric material makes it get higher piezoelectric coefficient and the total displacement performance of the unimorph actuator is improved. Finally, the piezoelectric actuator system with spring elements is fabricated and it shows higher actuating displacement capability.

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Omni-directional piezoelectric actuator using mixed mode (혼합 모드를 이용한 전방향성 초음파 액추에이터)

  • Jung, Woo-Suk;Kang, Jhong-Yun;Song, Hyun-Chul;Yoon, Seok-Jin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.299-299
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    • 2007
  • This paper presents an omni-directional piezoelectric actuator which utilizes only one actuator. The actuator has a simple structure of cone type consists of two piezoelectric ceramics of ring type and electrodes divided four segments and a stainless steel body. To find the optimal operating condition of the actuator, the frequency characteristics of the actuator are analyzed by ATILA, FEM and measured by Impedance Analyzer. We have also developed a stage using the omni-directional actuator and an actuator driver circuit to create four sinusoidal waves with a variable frequency and phase difference.

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Research for Stepping Motor Using Piezoelectric Torsional Actuator (압전회전작동기를 이용한 스텝모터에 관한 연구)

  • Kim Jun Hyuk;Kim Jaehwan;Chung Dal Do
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.4
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    • pp.499-505
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    • 2005
  • In this paper, a new type of pi+ezoelectric stepping motor is designed, manufactured and tested. This motor is composed of piezoelectric torsional actuator and a pair of one-way clutch bearings. The torsional actuator consists of 16-polygonal tube of piezoceramic that can produce an angular displacement associated with shear mode. One-way clutch bearing converts oscillation of torsional actuator into a continuous stepping rotation. The proposed stepping motor does not require any conversion mechanism for stepping motion like any other motors. In the design process, the shear resonance mode of piezoelectric actuator is analyzed by using a commercial finite element analysis program, and the performance of the fabricated torsional actuator is measured. $0.124^{\circ}$ of maximum angular displacement is measured in square wave excitation on the actuator only. The stepping motor is manufactured by assembling a pair of one-way clutch bearings and the torsional actuator. The maximum rotation speed of 72rpm and the blocking torque of 3.136 mNm are measured at 3540 Hz and 100V/mm. Once the proposed piezoelectric stepping motor is miniaturized, it can be used for many compact and precise moving applications.

A Finite-element Method of a Multilayer Piezoelectric Body for an Actuator Depending on Inner Electrode Pattern (내부전극패턴 변경에 따른 적층형 압전 액추에이터의 유한요소해석)

  • Lee, Hyeung-Gyu;Kang, Hyung-Won
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.12
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    • pp.1124-1128
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    • 2005
  • New piezoelectric actuator design, which can reduce the number of the stacking layer without lowering the piezoelectric displacement, is suggested in this work. Each layer of the new designed multilayer actuator has the same electrode pattern as the cross-sectioned layer of the existing multilayer actuator has. The piezoelectric displacement was calculated by Finite-Element Method (FEM) analysis. The maximum piezoelectric displacement of the new-designed actuator with 13 layers was calculated to be almost same value (55.9 ${\mu}m$) as that of the existing actuator with 25 layers(60.1 ${\mu}m$).

Precision Position Control of a Piezoelectric Actuator Using Neural Network (신경 회로망을 이용한 압전구동기의 정밀위치제어)

  • Kim, Hae-Seok;Lee, Byung-Ryong;Park, Kyu-Youl
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.11
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    • pp.9-15
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    • 1999
  • A piezoelectric actuator is widely used in precision positioning applications due to its excellent positioning resolution. However, the piezoelectric actuator lacks in repeatability because of its inherently high hysteresis characteristic between voltage and displacement. In this paper, a controller is proposed to compensate the hysteresis nonlinearity. The controller is composed of a PID and a neural network part in parallel manner. The output of the PID controller is used to teach the neural network controller by the unsupervised learning method. In addition, the PID controller stabilizes the piezoelectric actuator in the beginning of the learning process, when the neural network controller is not learned. However, after the learning process the piezoelectric actuator is mainly controlled by the neural netwok controller. In this paper, the excellent tracking performance of the proposed controller was verified by experiments and was compared with the classical PID controller.

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Development of Shell Element to Analyze an Intelligent Structure with Piezoelectric Sensor/Actuator (압전 감지기/작동기를 포함하는 셀 요소의 개발)

  • 황우석;고성현;박현철
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.3
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    • pp.225-231
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    • 2003
  • A new three-dimensional thin shell element for a structure containing an integrated distributed piezoelectric sensor and actuator is Proposed. The assumed strain formulation and the bubble function are introduced to improve the performance of the shell element. A finite element formulation gives a general tool that can predict the static or dynamic responses of the shell with piezoelectric sensor/actuator. The verification through the calculation of the static response for the piezoelectric bimorph beam shows that the results agree with those from the theoretical analysis very well. Dynamic response of a shell shows that the reduction of vibration is possible with the introduction of the piezoelectric shell sensor and actuator. However. the curvature of sensor/actuator is an obstacle for application, since the flexible PVDF is not strong enough and the PZT with curvature should be made specially.