• 항공우주시스템공학회지
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• 제10권4호
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• pp.75-83
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• 2016

본 연구에서는 복합형 무인 회전익기의 로터드라이브시스템 개발 개념을 정립하기 위해 관련 특허를 조사하고 분석하였다. 특허를 로터드라이브시스템 개발의 관점에서 10개의 유사한 그룹별로 나누어 세부적인 검토 및 분석을 수행하였다. 결과적으로, 특허 분석 결과를 통해 비행체의 로터드라이브시스템 개발 개념을 제안한다.

• 한국항공운항학회:학술대회논문집
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• 한국항공운항학회 2016년도 춘계학술대회
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• pp.9-13
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• 2016

Reaction drive rotor system is capable of providing hover and low speed capabilities to different aircraft concepts such as stopped rotor wing, canard rotor wing, compound gyroplane etc. Existing sizing and analysis tools for shaft drive rotor system cannot be applied directly to this system. The available methodologies to size this system were reviewed. Power available calculation procedure and factors affects it were addressed prior to sizing process. Various design issues of this system due to interrelationship of internal gas flow dynamics and rotor external aerodynamics was discussed. Finally, a modification that is required in existing sizing methodologies was identified and combined approach in sizing process to consider the interrelationship among engine, rotor and blade duct was introduced.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제5B권2호
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• pp.189-195
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• 2005

This paper presents a new velocity estimation strategy for a non-salient permanent magnet synchronous motor drive without high frequency signal injection or special PWM pattern. This approach is based on the d-axis current regulator output voltage of the drive system, which contains the rotor position error information. The rotor velocity can be estimated through a rotor position tracking PI controller that controls the position error at zero. For zero and low speed operation, the PI gain of the rotor position tracking controller has a variable structure according to the estimated rotor velocity. Then, at zero speed, the rotor position and velocity have sluggish dynamics because the varying gains are very low in this region. In order to boost the bandwidth of the PI controller during zero speed, the loop recovery technique is applied to the control system. The PI tuning formulas are also derived by analyzing this control system by frequency domain specifications such as phase margin and bandwidth assignment.

• 항공우주기술
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• 제7권1호
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• pp.49-60
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• 2008

스마트무인기 기술개발사업단에서 개발 중인 틸트로터 스마트무인기의 드라이브장치 개발과 관련하여, 주요 구성부품의 설계와 해석을 중심으로 개발 결과를 기술한다. 스마트무인기의 로터 구동을 위한 드라이브장치는 매우 정밀한 고난이 도의 시스템으로서 국내 개발 경험이 전혀 없는 기술 분야의 하나이다. 따라서 드라이브장치의 개발을 위해서 미국의 선진업체(EATI)와의 공동연구개발을 수행하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
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• pp.201-205
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• 2004

A method for driving and position sensing of TSRM(Toroidal Switched Reluctance Motor) using the search coil is presented in this paper. Position information of the rotor is essential for SRM drives. The rotor position sensor such as an opto-interrupter or high performance encoder is generally used for the estimation of rotor position. However, these discrete position sensors not only add complexity and cost to the system but also tend to reduce the reliability of the drive system. In order to solve these problems, in the proposed method, rotor position detection is achieved using the voltage waveforms induced by the time varying flux linkage in the search coils, and then the appropriate phases are excited to drive the SRM. But the search coil EMF is generated only when the motor rotates. Therefore the rotor position sensing method at standstill is also suggested.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.752-753
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• 2006

Oil Pump rotor is essential parts for automobile and, it is consisted of drive rotor and driven rotor in general. These parts are requested different properties according to environment. There are 2 types of Oil Pump rotor according to its usage. One is used for electric system, and the other is used for shaft-driven system. Especially, high precision and functionality is required in electric pump, and cost reduction is required in shaft-drive pump without slowing down its performance. This paper is mainly describing about the non-machine treated shaft-drive pump, based on the trial sample producing process.

• 산업기술연구
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• 제34권
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• pp.15-20
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• 2014

Recently, PMSMs(Permanent Magnet Synchronous Motors) have become increasingly popular in various high-performance motor drive applications. However, the high-performance drive of PMSMs needs a position sensor such as a resolver, which increases not only the price of the system but also reduces the system reliability. This paper is on the implementation of sensorless control of a SPMSM, which drives a fan for cooling in appliances. In this paper, the rotor position for high-performance drive of a SPMSM is derived from back electromotive force (EMF) information proportional to the rotor speed. Also, the initial rotor position information for start-up is estimated from a saturation phenomenon of inductance. The validity of the proposed sensorless drives was confirmed by the experiment on the SPMSM drive systems for cooling fans of refrigerators and laptop computers.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2004년도 춘계학술발표대회 논문집
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• pp.79-82
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• 2004

The rotor drive system in rotor-craft carries out power transmission from powerplant to rotors and the drive shafts are fallen into misaligned condition by the vibration of engine and shafts and the deformation of supporting structures. The high performance flexible coupling accommodates these misalignments of drive shafts. In this study, we compare the performance of the metalic flexible coupling with the composite flexible coupling through analytic method to develop the high performance flexible coupling used in the rotor drive system of UAV tilt-rotor.

• 항공우주기술
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• 제7권1호
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• pp.15-23
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• 2008

본 논문은 항우연에서 운용 중에 있는 축소 로터 시험장치(General Small-scaled Rotor Test System, GSRTS)에 대한 구조 안전성 확보를 위한 구조해석 수행 결과를 제시하고 있다. 프루드(froude) 축소 및 마하(mach) 축소 시험을 수행하고, 관절형 및 무힌지 로터 등 다양한 로터 시스템 적용을 위해서는 시험장치의 안전성 확보와 운용상의 능력 범위를 확인하기 위해 로터 운용 조건에서 나오는 기준하중을 이용하여 구조 안전계수를 산출하였다. 특히, 구동계통(drive system)은 베어링 및 기어, 축 등으로 구성되어 있어 운용상의 안전성 확보가 우선적으로 요구되는 필수 항목이다. 구조해석은 구동계통의 기본 부품의 형상 및 재료 물성치를 이용하여 해석적 방법으로 구하였다. 본 로터 시험장치는 설계된 안전계수 안에서 운용을 해야 하며, 향후 KUH 축소 품동모델 시험을 적용할 때도 하중계산을 통해서 시험시 운용조건의 범위를 정해야한다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제53권11호
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• pp.664-670
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• 2004

This paper presents a new velocity estimation strategy of a non-salient permanent magnet synchronous motor (PMSM) drive without high frequency signal injection or special PWM pattern. This approach is based on the d-axis current regulator output voltage of the drive system that has the information of rotor position error. The rotor velocity can be estimated through a rotor position tracking PI controller that controls the position error to zero. For zero and low speed operation, PI controller gains of rotor position tracking controller have a variable structure according to the estimated rotor velocity. In order to boost the bandwidth of PI controller around zero speed, a loop recovery technique is applied to the control system. The proposed method only requires the flux linkage of permanent magnet and is insensitive to the parameter estimation error and variation. The designers can easily determine the possible operating range with a desired bandwidth and perform the vector control even at low speeds. The experimental results show the satisfactory operation of the proposed sensorless algorithm under rated load conditions.