• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 추계학술대회논문집
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• pp.577-580
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• 2005

This paper reports the high sensitivity actuator for flexible disk. The air stabilized flexible optical disk has very small axial runout. Therefore, It is proper to develop an actuator which has high sensitivity in tracking direction rather than in focusing direction. In order to maximize driving force in radial direction, we present an efficient design of magnetic circuit with simple multi-polarized magnets and auxiliary magnets. Designed magnetic circuit has big force in tracking direction. And we shift 2$^{nd}$ resonance frequency of moving parts Into high frequency band, not causing increase of mass and discord between force and mass centers to secure high sensitivities and sufficient control bandwidth. Finally, experimental results show that designed actuator has superior sensitivity in tracking direction.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2009년도 제33회 추계학술대회논문집
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• pp.573-577
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• 2009

초음속제트 엔진의 동적거동 모사를 수행하고 흡입구에서의 버즈 마진 확보와 추력 제어를 위한 PI 제어 알고리즘을 연구하였다. 먼저 연료유량 제어를 통해 요구추력을 추종하고 노즐 목 면적 제어를 통해 흡입구에서의 버즈마진이 항상 양의 수를 갖도록 흡입구 출구 압력을 조절하였다. 비행 마하 수, 고도, 받음각 변화에 따라 추력제어와 버즈 마진 제어를 위한 비례 게인과 적분 게인을 각각 구하고 시뮬레이션 하였다. 그 결과 비행 마하 수 2.1에서 3.0, 받음각 $0^{\circ}$에서 $10^{\circ}$ 사이의 운용영역에서 제어목표를 만족함을 확인하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 추계학술대회논문집
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• pp.512-514
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• 2008

In this paper, a new electromagnetic circuit is proposed for an optical pickup actuator with high sensitivity. Contrary to those of conventional actuators, the proposed circuit has two focusing coils which are diagonally placed at the front and rear of a moving part. The configuration which makes the effective length of the focusing coil longer and the moving part lighter, is helpful in increasing the sensitivity of the actuator. However, the asymmetry of the moving part by two focusing coils causes flexible node vibrations in quite low frequency range. This paper shows that the design modification of the moving part for the reconfiguration of mass moment of inertia can reduce the mode vibrations.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2010년도 추계학술대회
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• pp.66-67
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• 2010

마이크로그리드 또는 발전용 연료전지 시스템과 같이 계통 이상 시 독립운전으로의 모드전환이 필요한 응용에서 과도현상을 최소화하는 Seamless Transfer 기술이 필수적이다. 모드전환 시 전압제어를 유지함으로서 이러한 과도상태를 최소화할 수 있는 간접전류제어 알고리즘이 제안된 바 있다. 그러나 제어기 모델에 의한 해석이 불가능하므로 제어 파라미터 설정이 어려운 단점이 있었다. 본 논문에서는 인버터의 모델을 고려하여 제어기를 해석함으로서 원하는 제어대역폭과 위상마진을 갖는 제어기의 게인 설정을 가능하게 하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 추계학술대회논문집
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• pp.479-483
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• 2006

As high-definition television(HDTV) broadcasting were generalized, there have been many researches and developments about large storage capacity and fast data transfer rate in optical disk drives(ODD). Pickup actuators must have high flexible mode frequencies and gain margins. Flexible modes are caused by the flexibility of moving parts in the actuator and a servo bandwidth is limited by them. As a result, the system becomes unstable for high-speed operations in high density reading and recording. In this paper, we suggest improved modeling method that considers the bonding layer. And, flexible mode frequency of actuator is improved by Design of Experiment of lens holder. Magnet circuit is designed considering the relation with moving part. Through improving yoke design, the magnetic flux is changed and DC tilt is reduced. Consequently, we designed actuator which has high flexible mode frequency and gain margins.

• 정보저장시스템학회논문집
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• 제2권4호
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• pp.240-244
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• 2006

As high-definition television(HDTV) broadcasting becoming more generalized, there have been many researches and developments about a large storage capacity and a fast data transfer rate in optical disk drives (ODD). Pickup actuators must have high flexible mode frequencies and large gain margins. Flexible modes are caused by the flexibility of moving parts in the actuator and a servo bandwidth is limited by them. As a result, the system becomes unstable for high-speed operations in high density reading and recording. In this paper, we suggest improved modeling method in considering of the bonding layer. And, the flexible mode frequency of actuator is improved by Design of Experiments of lens holder. The Magnet circuit is designed considering the relation with the moving part. Through improving the yoke design, the magnetic flux is changed and the DC tilt is reduced. Consequently, we designed an actuator which has a high flexible mode frequency and a large gain margins.