• 전력전자학회논문지
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• 제5권1호
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• pp.95-103
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• 2000

본 논문에서는 브러시리스 직류 전동기용 센서리스 드라이브의 성능 향상을 위한 새로운 회전자 위치 간접 검출 방식을 제안한다. 단자 전압을 이용하는 기존의 회전자 위치 간접 검출 방식들은 전동기를 동기 모드로 운전시 과도한 전압이 인가되면 회전자 위치를 정확히 검출할 수 없기 때문에 센서리스 운전 모드로의 신속한 전환이 어렵다. 따라서 본 논문에서는 전동기를 동기 모드로 운전하는 경우, 과전압에 의한 단자 전압과 역기전력 파형의 관계를 분석하여 저속 운전 영역에서도 회전자 위치를 정확히 검출할 수 있는 새로운 간접 검출 방식을 제안한다. 또한 실험을 통하여 제안한 방식의 효용성을 입증한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.31-36
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• 1999

In this paper, a novel indirect rotor position sensing method is proposed to improve the performance of sensorless drive of brushless DC motors. Fast mode change to the sensorless operation is difficult in the existing indirect rotor position sensing methods because precise rotor position can not be obtained when an excessive input is applied to the drive during synchronous operation mode. To cope with this problem, the relationship between terminal voltage and back-emf waveform is analyzed in this paper, also a novel indirect position sensing method which can detect a precise rotor position at low speed range is proposed. The effectiveness of the proposed method is verified through the experimental results.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.507-515
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• 2002

Remote Sensing Monitoring and Loss Estimated System of Flood Disaster based on GIS is an integrated system comprised flood disaster information receiving and collection, flood disaster simulation, and flood disaster estimation. When the system receives and collects remote sensing monitoring and conventional investigation information, the distributional features of flood disaster on space and time is obtained by means of image processing and information fusion. The economic loss of flood disaster can be classified into two pus: direct economic loss and indirect economic loss. The estimation of direct economic loss applies macroscopic economic analysis methods, i.e. applying Product (Industry and Agriculture Gross Product or Gross Domestic Product - GDP) or Unit Synthetic Economic Loss Index, direct economic loss can be estimated. Estimating indirect economic loss applies reduction coefficient methods with direct economic loss. The system can real-timely ascertains flood disaster and estimates flood Loss, so that the science basis fur decision-making of flood control and relieving disaster may be provided.

• 전력전자학회논문지
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• 제2권3호
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• pp.44-50
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• 1997

본 논문은 영구자석 매입형 브러시리스 직류 전동기를 회전자 위치 센서 없이 구동하는 센서리스 드라이브의 개발에 관한 연구이다. 영구자석 매입형 전동기는 회전자의 위치에 따라 각 상의 인덕턴스가 크게 변화한다. 회전자의 위치를 간접적으로 검출하기 위해 인덕턴스 변화에 따른 단자전압 파형의 특성을 분석하고 이에 적합한 회전자 위치 간접검출 방법을 제시하였다. 또한 87c196mc 원 칩 마이크로프로세서를 이용하여 실용적이고 경제성 있는 센서리스 드라이브를 제작하여 에어콘 콤프레서의 구동에 적용하였다. 제시된 실험 결과는 본 연구에서 제안한 간접검출 방법의 타당성과 개발된 드라이브의 유용성을 보여준다.

• 대한원격탐사학회지
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• 제18권6호
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• pp.327-336
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• 2002

다양한 분야에서 고해상도 위성영상의 활용도가 높아짐에 따라 많은 고해상도 인공위성이 발사되고 있으며 발사예정에 있다. 본 논문은 DEM과 항공사진영상을 이용하여 임의의 궤도정보와 자세정보를 가지는 인공위성에 대하여 모의위성영상을 제작할 수 있는 두 가지 방법을 제안하였다. 제작된 모의위성영상의 센서모델에서 자세는 변화가 없는 것으로 가정하였고, 투영중심의 위치는 위성의 진행방향에 따라 변화하는 모델을 사용하였다. 또한 자세와 위치에 변화를 준 모의위성영상을 제작하여 입체시 가능성을 실험하였으며, 제작된 모의위성영상의 정확도를 검증하기 위해 공간전방 교회를 이용하여 검증하였다.

• Design & Manufacturing
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• 제15권1호
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• pp.14-20
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• 2021

The objective of this study is to introduce the new possibility of sensing technology based on inductive displacement sensors to monitor the status of wheel position in the hot forging process. In order to validate effectiveness of proposed sensing technology, the indirect forging force measurement with displacement sensor was applied into a typical closed hot forging die-set used for the manufacturing of flange bolts. The locations to implement the displacement sensor were selected carefully by simulating forming process and static structural. From the measurement results of the forging force change during one hot forging cycle, it was found that the proposed monitoring system can provide useful information to understand the detailed behaviors of die-set in the closed hot forging process.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 F
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• pp.2095-2097
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• 1997

This paper describes a indirect sensing method for the rotor flux position of interior permanent magnet (IPM) brushless DC motors. The phase inductance of an IPM motor varies appreciably according to the rotor position. The waveform characteristics of the terminal voltage of IPM brushless DC motors is analysed and a simple and practical method for indirect sensing of the rotor position is proposed. A compact sensorless drive is implemented and tested using a 87c196mc 16-bit microcomputer. The experimental results show the validity of the proposed method and the drive works well from 500 to 7,200rpm.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.591-595
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• 2000

In this paper we proposed a new sensorless drive system for the trapezoidal type brushless DC motor which does not use any mechanical position or speed sensor and applicable to the systems requiring a constant speed and torque such as Fan. For this a novel indirect rotor position sensing technique based on a detailed analysis of the terminal voltage characteristics is proposed in this paper. And a sensorless drive system for the brushless DC motor is implemented using a 87c196mc fo the main microprocessor and a power FET for the inverter. The experimental results will show the validity of the proposed indirect sensing method and the practical use of the sensorless drive

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제48권2호
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• pp.63-68
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• 1999

This pper describes a digital sensorless drive of permanent magnet brushless DC motors. In order to detect in real time the rotor positions of which Emf becomes zero, terminal voltages are sampled during PWM duty cycle. This method generates detection error in indirect sensed position, which is the harmonic component of PWM frequency. In this paper, the drive adopted Butterworth low pass filter for rejection of the sensing error and for accurate estimation of commutation time. Analytical design process of the digital filter is proposed and the experimental results show that the performance of the proposed sensorless drive is superior to that of the sensorless drives without filterint.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.653-657
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• 1996

This paper presents adaptive cutting force control in milling process using indirect cutting force measurement. The cutting forces in X, Y, and Z axes are measured indirectly from the sensing current of the feed-drive servo motor. After modelling the feed-drive system of a horizontal machining center, the relation between the cutting force and the servo motor current is analyzed. The pulsating milling forces are measured from the sensing current within the bandwidth of the servo. It is shown that indirect cutting farce measurement can be used in adaptive cutting force control. The adaptive control scheme which is globally convergent and stable is attached to a commercial CNC machining center. Cutting experiments on end milling are performed for diagonal cutting.