• Title/Summary/Keyword: 풍차형

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Fabrication and FEM Analysis of Wind-Mill Type Ultrasonic Motors using Piezoelectric Ceramics (압전 세라믹스를 이용한 풍차형 초음파모터의 제작과 유한요소해석)

  • 강형우;이상기;박태곤
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.373-376
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    • 2000
  • The modified Moonie(Cymbal) transducer has been investigated for an accelerometer application. This paper present a wind-mill type ultrasonic motors using ternary piezoelectric ceramics and aluminum endcaps applied by cymbal transducer. The maximum displacement was increased depend on applied voltage and layer number. The multi-layer was fabricated by tape casting using doctor-blade process. The maximum displacement of multi-layered ultrasonic motor was much higher than that of one-layered.

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Fabrication of Ultrasonic Motors of Wind-Mill Type using Piezoelectric Ceramics and Its Characteristics (압전 세라믹스를 이용한 풍차형 초음파 전동기의 제작과 특성)

  • 지승환;이덕출;김진수
    • Electrical & Electronic Materials
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    • v.10 no.9
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    • pp.889-894
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    • 1997
  • A miniaturized wind-mill type ultrasonic motor which has diameter in 12.7 mm and thickness in 2.0mm using PMN-PZT piezoelectric ceramics was fabricated. The wind-mill type ultrasonic motors has only three plate and of two wind-mill shape slotted metal endcaps a rotor whose end is hollowed out so that its periphery fits with the shape of the stator and a bearing to guide the rotor. A Finite Element Analysis was carried out to obtain the endcaps behavior under a radial displacement change of piezoelectric disk and to optimize the structure of the number of slots. Increasing the applied voltage the revolution speed of ultrasonic motors was increased. The maximum speed of 700 rpm and the maximum torque of 0.22 nN·m of the wind-mill type ultrasonic motors were obtained.

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The Effect of Stator`s Slot on the Torque in the Windmill Type Ultrasonic Motor (풍차형 초음파 전동기의 고정자 슬롯이 토크에 미치는 영향)

  • 김영균;김진수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.323-326
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    • 1999
  • In this paper, a windmill type ultrasonic motor operated by single-Phase AC electric field was fabricated, and then torque characteristics were investigated. A metal-ceramic composite component was used as the stator\`s vibrator to generate ultrasonic vibrations. The windmill type ultrasonic motors has only three components; a stator element with two wind-mill shape slotted metal endcaps, a rotor and a bearing. In this parer we measured torque, when stator\`s slot was changed Iron 4, 6, 8. Brass metal was pressed with umbrella-type using metal molt then slot of 3 kind was manufactured. The maximum revolution speed was 388(rpm) in the case of a small ultrasonic motor of 11.35 mm diameter, 8 slot and 1.01 mm thickness. The maximum torque of 0.17 mNm was obtained at a speed of 131 rpm.

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Effect of Pressing Force Applied to a Rotor on Revolution Characteristics in the Windmill Type Ultrasonic Motor (풍차형 초음파 전동기의 회전자에 인가된 힘이 회전특성에 미치는 영향)

  • 김영균;김진수
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.13 no.5
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    • pp.390-395
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    • 2000
  • The ultrasonic motor have recently begun to be used for certain unique practical utilizations in the fields of industrial medical consumer and automotive applications. Ultrasonic motor stimulated to ultrasonic oscillations by piezoelectrics to drive a rotor via friction contact. The metal and ceramic composite component was used as the stator element to generate ultrasonic vibrations. The ultrasonic motor used here was the windmill type ultrasonic motor operated by single-phase AC source. The windmill type ultrasonic motors has only three components; a stator element of two windmill shape slotted metal endcaps a rotor and a bearing. In this paper a prototype motor with 11.35 mm diameter was fabricated then relationship between the pressing force applied to a rotor and the rotation characteristic of windmill type ultrasonic motor are investigated when stator’s slots was changed from 4, 6, 8 and thickness changed from 0.15, 0.20 mm, respectively. Optimum pressing force applied to a rotor in the six stators was 1.2 mN.

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A Study on the Characteristics of Windmill Type Ultrasonic Motor with Changed Endcap Shape Using FEM (FEM을 이용한 endcap 형상이 변형된 풍차형 초음파 모터의 특성연구)

  • Lee, J.H.;Park, T.G.;Kim, M.H.
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1500-1503
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    • 2002
  • In this paper, we proposed windmill type ultrasonic motor which has modified shape of Endcap. The motor was especially designed by FEM for high speed. As results, displacements of the windmill and the clover type motor was compared. Using clover type motor, more smooth rotation of rotor was achieved. If Z component of the displacement of the clover type motor can be applied for linear motor.

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Finite Element Analysis of Windmill Type Ultrasonic Motors Depend on the Shape of Ceramics (세라믹 형상에 따른 풍차형 초음파 모터의 유한요소해석)

  • Lee, Jae-Hyung;Park, Tae-Gone;Kim, Myung-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07b
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    • pp.674-677
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    • 2002
  • In this paper, two kinds of windmill type motors which have a disk shape and a ring shape piezoelectric ceramics were studied. And characteristics of two models were compared with each others. A windmill type ultrasonic motor is composed of a stator, a rotor, and a ball bearing. The stator is made of a piezoelectric ceramics and two metals endcaps. When the piezoelectric ceramics vibrate, displacement of torsonal vibration appear at metal endcaps. The motor with 11.0[mm] diameter was studied by finite element analysis. The voltage of 100[V] was supplied at each model. Resonance frequency of 206.875[KHz] was obtained at the disk type, but ring type was 137.562[KHz]. The maximum torsonal displacement of $1.112[{\mu}m]$ was obtained at the disk type, but ring type was $1.698[{\mu}m]$.

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Aerodynamic Performance Prediction of a Counter-rotating Wind Turbine System with Wake Effect (후류영향을 고려한 상반회전 풍력발전 시스템의 공력성능 예측에 관한 연구)

  • Dong, Kyung-Min;Jung, Sung-Nam
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.7
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    • pp.20-28
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    • 2002
  • In this paper, the aerodynamic performance prediction of a 30kW counter-rotating (C/R) wind turbine system has been made by using the momentum theory as well as the two-dimensional quasi-steady strip theory with special care on the wake and the post-stall effects. In order to take into account the wake effects in the performance analysis, the wind tunnel test data obtained for a scaled blade are used. Both the axial and rotational inductions behind the auxiliary rotors are determined through the wake model. In addition, the optimum chord and twist distributions along the blades are obtained from the Glauert's optimum actuator disk model considering the Prandtl's tip loss effect. The performance results of the counter-rotating wind turbine system are compared with those of the conventional single rotor system and demonstrated the effectiveness of the counter-rotating wind turbine system.

Resonance & Vibration Velocity Characteristics of the Wind-mill type Stator of Ultrasonic Motor (풍차형 초음파 전동기 고정자의 공전 및 전동 속도 특성)

  • 박만주;김영균;김진수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1998.11a
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    • pp.231-234
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    • 1998
  • In this study, the wind-mill type ultrasonic motor was fabricated, and then resonant frequency and vibration velocity characteristics of the stator were measured. Brass metal was pressed with umbrella-type using metal mold, then slot of 4 kind was processed in each of thickness. Among sixteen's stators, resonant frequency on vibration velocity was decreased remarkably in stator of higher resonant point, but resonant frequency on vibration velocity wasn't almost changed at lower resonant point of stator. The thickener thickness of elastic body, vibration velocity was decreased. The more slot of elastic body, vibration velocity was increased Applied voltage was changed from 10$V_{max}$ to 100$V_{max}$. Maximum vibration velocity value was 2.0[m/s].

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Fabrication of the Windmill Type Ultrasonic Its Characteristics of Torque and Bidirectional Revolution (풍차형 초음파 전동기의 제작과 토크 및 정$\cdot$역회전특성)

  • Kim, Young-Gyun;Kim, Jin-Soo
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.50 no.3
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    • pp.105-109
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    • 2001
  • In this paper, the windmill type ultrasonic motors with 11.35 mm diameter, 2.87 mm thickness of metal endcap and 1.47 g weight were fabricated. Effects of slots and thickness on torque characteristic in the windmill type ultrasonic motor were investigated, when stator's slots were changed from 4, 6, 8 and thickness 0.15 mm, respectively. Specially designed metal endcaps with windmill shaped cutting can provide longitudinal and torsional displacements simultaneously as the ceramic disk vibrates radically. The windmill type ultrasonic motor has only three components: a stator element with windmill shape slotted metal endcap, a rotor and bearing. Ultrasonic motor stimulated to ultrasonic oscillations by piezoelectrics to drive a rotor via friction contact. The ultrasonic motor fabricated here was the windmill type ultrasonic motor operated by single-phase AC source. Bidirectional revolution using single-phase high frequency for driving the ultrasonic motor was presented.

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FEM Analysis of 3-Dimensional Vibration Mode for Windmill type Ultrasonic Motors (풍차형 초음파 전동기에 대한 3차원 진동모드의 유한요소해석)

  • Kim, Woo-Tae;U, Sang-Ho;Shin, Soon-In;Kim, Jin-Soo;Sa, Jeong-Woo;Kim, Ki-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.05c
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    • pp.110-113
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    • 2001
  • In this paper, vibration mode of Windmill type Ultrasonic Motors was analysed. We used the ANSYS program to analysis by FEM. Vibration Mode express 20 modes as each resonance frequency. We bind nearly same modes and compress 5 modes. Windmill type Ultrasonic Motor's rotation is generated the friction of rotor at top endcap. Thus, We will find the best driving frequency that generating large friction at top endcap.

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