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재질 및 사이즈 변화에 따른 심벌타입 압전 트랜스듀서의 발전특성
박충효(Choong-Hyo Park),김종욱(Jong-Wook Kim),정현호(Hyon-Ho Chong),정성수(Seong-Su Jeong),김명호(Myung-Ho Kim),박태곤(Tae-Gone Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Generating characteristics of cymbal type piezoelectric transducer depending on changes in materials and thickness of elastic bodies were studied. Cymbal type piezoelectric transducer is well known model in the piezoelectric transducer fields. Particularly, the transducer has good characteristic for stress of low frequency. Shape of the transducer is that the elastic bodies of cymbal type are attached to upper and bottom of the piezoelectric ceramic. The principle of generation is to generate larger displacement of the ceramic because applied vertical stress is transformed into horizontal stress by slope angle of the elastic bodies. This study was based on the previous study on generating characteristics of cymbal type transducer depending on shape of the cymbal cap. To define generating characteristic depending on changes in materials and thickness, simulation was performed by FEM program. From the simulation, the model of high efficiency could be chosen.
박충효,김종욱,정성수,정현호,김명호,박태곤,Park, Choong-Hyo,Kim, Jong-Wook,Jeong, Seong-Su,Chong, Hyon-Ho,Kim, Myong-Ho,Park, Tae-Gone 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.1
On this paper, a circular unimorph-type piezoelectric transducer was proposed and studied. The transducer was fabricated by attaching a circular-shaped PZT ceramic to a circular plate of brass and output characteristics of the fabricated transducer were then analyzed and measured by changing driving points where the mechanical vibrations were applied. Two conditions depending on the location of vibration were respectively defined as a center forced model and an edge forced model. The resonance frequency and output voltage of the models were simulated by using ANSYS, a FEM(finite element method) program. Based on the results of the analyses, the vibration experiment was conducted and the output characteristics then measured through measurement equipment. As a result, the maximum output characteristics of two models were respectively generated at each resonance frequency and the resonance frequency of the center forced model was lower than the edge forced model.
김종욱,박충효,정현호,정성수,박태곤,Kim, Jong-Wook,Park, Choong-Hyo,Chong, Hyon-Ho,Jeong, Seong-Su,Park, Tae-Gone 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.7
In this paper, the characteristics of a thin-type ultrasonic motor generating elliptical displacements analyzed by FEM are presented, and then fabrication of the motor is then described. The structure of the motor consists of sixteen ceramic pieces attached to the upper and bottom surfaces of an elastic body. The principle of the motor is to apply alternating voltages which have a 90 phase difference to the attached ceramics, and then elliptical displacements are generated at four edges of the elastic body. Then the rotor is moved by the elliptical displacements. In the case of a ceramic thickness of 1.5, the highest speed was obtained at 79 kHz. In the case of a ceramic thickness of 2 mm, the highest speed was obtained at 77.5 kHz. Consequently, the speed and torque of the ultrasonic motor (USM) increased linearly with increasing applied voltage.
김종욱,박충효,임정훈,정성수,김명호,박태곤,Kim, Jong-Wook,Park, Choong-Hyo,Lim, Jung-Hoon,Jeong, Seong-Su,Kim, Myong-Ho,Park, Tae-Gone 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.9
A novel design of a simple square-frame USM (ultrasonic motor) was proposed. The stator of the motor consists of a square-frame shape elastic body and four rectangular plate ceramics. The four ceramics were attached to inner surfaces of the square frame elastic body. The same phase voltages were applied to the ceramics on horizontal surfaces, and 90 degree phase difference voltage were applied to the ceramics on vertical surfaces. To find a model that generates elliptical motion at outside of the stator, the finite element analysis program ATILA was used. The analyzed results were compared to the experimental results. As result, the model EL10EH3ET0.5CL4 which generates the maximum elliptical displacement was chosen by analyzing the resonance mode according to changes in frequency.
정성수,박충효,강신출,김종욱,임정훈,김명호,박태곤,Jeong, Seong-Su,Park, Choong-Hyo,Kang, Shin-Chul,Kim, Jong-Wook,Lim, Jung-Hoon,Kim, Myong-Ho,Park, Tae-Gone 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.11
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.
김종욱(Jong-Wook Kim),박충효(Choong-Hyo Park),정성수(Seong-Su Jeong),정현호(Hyon-Ho Chong),박태곤(Tae-Gone Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
In this study, a coupled standing wave-type ultrasonic motor is proposed and analyzed. A prototype of the motor was fabricated by using a v shaped SUS stator which consist of two ceramic pieces attached on upper surfaces. Principle of the motor is to apply alternative voltages which have 90 phase difference to attached ceramics, and then elliptical displacement is generated at tip of stator. As a result, the slider was driven by frictional force and the revolving direction of tip is same to slider direction. To obtain analysis result, FEM(finite element method) was used by ATILA 1.4.5. Design Variables is chosen as the size of the stator and ceramics. The arm, leg and angle of fabricated motor is 6 [㎜], 7 [㎜] and 75°, 95° respectively. A deformation amplitude of about 0.16 [㎛] can be obtained by applying a 70 [V] voltage. Likewise, maximum speed of the motor represent 0.08 [㎧] at 70 [V] voltage.
정성수(Seong-Su Jeong),박민호(Min-Ho Park),정현호(Hyon-Ho Chong),김종욱(Jong-Wook Kim),박충효(Choong-Hyo Park),박태곤(Tae-Gone Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
본 연구에서는 두께가 얇고 간단한 구조를 갖는 V-type 초음파모터를 설계하였다. 얇은 판형 스테이터 구조는 소형 정밀 기기용 액추에이터로서의 역할이 가능하고, 회전형 및 선형 초음파모터로 제작이 가능한 장점을 가진다. 스테이터는 ‘V'형태의 얇은 금속판의 아랫면과 윗면에 길이방향 진동을 갖는 압전세라믹이 접합된 형태이고, 두 leg가 결합되는 모서리 부분에서 생성된 타원변위를 로터에 전달하여 움직임을 얻어낸다. 유한요소해석 프로그램(ATILA)을 이용하여 최적설계된 모터를 제작하고, 운전특성을 측정하여 소형 정밀기기에 적용이 가능함을 확인하였다.