• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.321-321
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• 2010

In this paper, we propose a novel type shaft-less ring type ultrasonic motor. A traveling wave rotary type ultrasonic motor is selected as a base model. The newly designed stator has two piezoelectric ceramic rings which are bonded in sandwich shape as traveling wave generator. So, we can expect to produce higher torque. The proposed model has the rotor structure that coupled with the stator provokes the pressure, this model do not install the separate plate any spring device. We used the finite element method to verify the operation principle and to compute the vibration mode of proposed model.

• 한국전기전자재료학회논문지
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• 제13권4호
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• pp.280-285
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• 2000

The conventional ultrasonic linear motors developed so far utilize a standing wave and are of a pi-type or a hybrid transducer type structure. Traveling wave type bi-direction linear motors have not been developed yet. This paper describes design of a new bi-directional ultrasonic linear motor working by means of a traveling wave. With the finite element method we design and verify validity of the new structure. And we determine its optimal structure size of design variables material and boundary conditions for proper generation of the traveling wave.

• Journal of international Conference on Electrical Machines and Systems
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• 제3권1호
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• pp.32-39
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• 2014

Traveling wave generation in a ring type stator has been studied. The basic working principle to create traveling wave has been modelled by the superposition of two orthogonal standing waves. Theoretical analysis shows that the length to radius ratio affects the frequency gap between two pseudo orthogonal modes used to create traveling wave. FEM simulation is then discussed and applied to validate the analytical model. At last, a possible optimal solution is reported with FEM verification.

• 한국진공학회지
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• 제6권S1호
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• pp.89-95
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• 1997

A new type of piexoelectric membrane traveling wave motor has been designed and forbricated. The small motor is composed by the stator which is the combination of annular/circular membrane and metal elastic base using as the common electrode at some time and the rotor which is placed on the metal elastic body. Thus the motor structure is simple and easy to fabricate. The material of a piezoelectric membrane is fabricated by sol-gel method or wear-down method. A piezoelectric traveling wave motor has been fabricated with the stator diameter 8mm The total thickness of the stator is 350$\mu$m. Under the alternative excitation voltage 10-12V the revolving speed of the rotor is more than 100RPM.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권6호
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• pp.450-456
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• 2000

In this paper, we proposed a novel control method which uses the internal impedance angles as a control parameter to drive traveling wave type ultrasonic motor. An impedance characteristic of the ultrasonic motor is obtained by analysis of the equivalent circuits including the external inductor used to generate the coupled resonance. The phase angle of internal impedance to achieve optimal control performance is derived. For the tracking of impedance angle, an information of phase difference is obtained from the applied voltage and current. The high speed phase difference detector is designed to monitor the phases of ultrasonic motor. The effectiveness of the proposed control scheme is clarified by experiments.

• 한국음향학회지
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• 제18권8호
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• pp.25-31
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• 1999

본 논문에서는 진행파를 이용하여 쌍방향으로 움직일 수 있는 새로운 구조의 초음파 리니어 모터를 개발하고, 그 시제품을 제작하였다. 설계과정에서는 유한요소해석법을 이용해 모터구조의 타당성을 검증하였고, 진행파가 왜곡되지 않는 최적구조, 재질, 크기, 경계조건을 결정하였다. 설계 결과에 따라 리니어 모터를 실제로 제작하고, 특성을 평가함으로써 개발된 새로운 구조의 이용 가능성을 확인하였다.

• 전력전자학회논문지
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• 제4권3호
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• pp.285-293
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• 1999

본 논문에서는 인버터를 사용하여 진행파형 초음파 모터를 구동할 때에 구동 주파수, 위상차 및 상간의 전압을 제어하기 위해 새로운 방식의 초음파 모터 구동용 디지털 제어기를 제안하였다. 제안된 디지털 제어기는 주파수 발생과 위상차 제어를 하기 위하여 기존의 제어기에서 사용한 디지털-아날로그 혼합 방식이 아닌 디지털 논리에 의하여 출력이 발생되며 이로 인하여 제어기의 구성이 대폭 단순해진 특징을 갖는다. 제안된 디지털 제어기는 두 가지 형태로 주파수와 위상만을 제어하기 위한 경우와 상간의 전압까지 제어하기 위한 경우로 분리하였다. 실험에서는 상용 LSI와 EPLD를 사용하여 구현된 단순화된 디지털 제어기의 성능을 평가하였다.

• 전력전자학회논문지
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• 제5권2호
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• pp.105-114
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• 2000

본 논문에서는 진행파형 초음파 모터 구동을 위한 직렬형 모터측에 직렬로 삽입되는 인덕터의 설계를 위한 새로운 해석 방법을 제시하였다. 초음파 모터의 구조를 등가적으로 해석하였고 이를 토대로 직렬 인덕터의 선정법을 제시하였다. 직렬 인덕터가 최적으로 설계되었을 때 모터 내부의 기계측 고유 공진 요소에 효율적인 전력이 전달될 수 있음을 시뮬레이션을 통하여 확인하였다. 여러 단계의 외부 인덕터에 대한 실험을 통하여 초음파 모터의 주파수 및 속도 특성이 검토되었다. 그 결과 제안된 외부 인덕터 선정방법의 타당성이 입증되었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 A
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• pp.597-599
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• 1996

This paper describes the bending traveling-wave type ultrasonic motor which generates the traveling wave by combining two standing waves with phase difference time and space. In $+20^{\circ}C{\sim}30^{\circ}C$, the USM motor operation character has represented normal condition. But the other temperature, (that is say, when long time operating condition) USM operation characteristic has abnormal condition, that is driving frequency, drive current and r.p.m is down. The recent USM has controller without temperature compensation. This study aimed at fuzzy controller which must follow the frequency at operation temperature and then r.p.m and torque increase.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1996년도 창립기념 전력전자학술발표회 논문집
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• pp.52-55
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• 1996

This paper describes the bending traveling-wave type ultrasonic motor which generates the traveling wave by combining two standing waves with phase difference time and space. In $+20^{\circ}C$~$30^{\circ}C$, the USM motor operation character has represented normal condition. But the other temperature, (that is say, when long time operating condition) USM operation characteristic has abnormal condition, that is driving frequency, drive current and r.p.m is down. The recent USM has controller without temperature compensation. This study aimed at fuzzy controller which must follow the phase angle difference 90$^{\circ}$at operation temperature and them r.p.m and torque increase.