• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.973_974
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• 2009

본 연구는 영구자석 AC 동기전동기의 초기 기동제어에 대하여 연구하였다. 회전자 위치 검출용 센서는 홀센서를 사용하였고 전동기 운전을 벡터제어를 사용하기 위해 전동기가 정지된 상태에서 홀센서 신호에 따른 회전자 위치를 계산하였다. 견인전동기가 주행저항 보다 큰 견인력을 내기 위해 전동기를 BLDC로 기동한 후 안정적 운전을 위해서 벡터제어로 전환하였다.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.530-531
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• 2010

최근 고유가 문제와 환경에 대한 관심 증가로 인해 친환경 저연비 자동차에 대한 기술 연구가 다양한 분야에서 활발히 진행되고 있다. 이 가운데서도 특히 반도체 및 배터리의 급속한 기술발전으로 자동차용 부품들이 기계식 방식에서 전자식 방식으로 대체되고 있다. 자동차 동력효율을 높이기 위해 내연기관 및 주변 전장장치들의 온도를 주행조건에 따라 제어하여 적정하게 유지시킬 필요가 있으며 이를 위한 자동차 부품으로 전동워터펌프의 중요성이 커지고 있다. 본 논문에서는 이와 같은 자동차용 전동워터펌프 제어기 개발을 위하여 브러시리스형 DC모터를 적용하였으며, 내환경성과 고신뢰성을 고려하여 제어기를 개발하였다.

• Journal of the Korean Society of Industry Convergence
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• v.9 no.3
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• pp.221-228
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• 2006

As Industrialization gets more and more advanced, human technological medical apparatus for dentistry has been developed. Such a medical apparatus have to let precision revolution and torque control facilitate. Consequently, Development of Micro hand-piece with strong durability should be required. Moreover, It's also very important to evaluate performance of such a Micro hand-piece, Evaluation of Mechanical property of Material and ANOVA have been known as useful methods in the field of Quality Evaluation. For Verification of Quality Evaluation, It has been evaluated by One-way layout ANOVA based on the data of Surface Roughness Test. Anyhow, This test has been respectively carried out by 3 kinds of Test and Superior performance has appeared in the Test result.

• Proceedings of the KIEE Conference
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• 1993.07b
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• pp.883-885
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• 1993

This paper presents a integral-augumented nonlinear sliding surface without a reaching phase. The conventional linear sliding surface has reaching phase, and sliding mode can't realized during this phase, the trajectories may he sensitive to the load disturbances. An proposed algorithm does not have reaching phase, so robust to the load disturbances.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1094-1095
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• 2007

현재 산업분야에서는 보편적으로 방경방향 자속(Radial Flux)형 전동기가 사용되고 있다. 때문에 대용량의 경우 축방향 길이가 길어지게 되고 구조적 제약이 있는 곳에서의 적용이 어렵다. 이와 달리 축방향 자속(Axial Flux)형 전동기의 응용 범위는 광범위하며 기구적, 구조적으로 많은 이점을 지니고 있다. 본 논문에서는 7.5kW급 축방향 자속형 Brushless DC(BLDC) 전동기의 구동회로 및 속도제어 알고리즘을 구성하고 시뮬레이션과 실험을 통하여 그 결과를 검토하였다.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.6
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• pp.569-577
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• 2005

In this paper, a new control scheme to use 6-switch IGBI module for 3-phase switched reluctance motors(SRM) is proposed. Compared with the conventional asymmetric bridge converter topology, it can minimize the entire system size and cost. Therefore, it may have a new topology lot SRM to compare the other ac motors, such as induction motors, brushless dc motors, and so on. The validity of the proposed method is verified by simulation, and experimental results.

• Transactions of the Korean hydrogen and new energy society
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• v.34 no.6
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• pp.758-766
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• 2023

Multi-copter of unmanned aerial vehicle (UAV) was initially developed as strategic technology in the only military field, but it is developing into an industrial field with a wide range of applications in the civil sector based on the development and convergence of aviation technology and information and communication technology. Currently, the degree of utilization of multi-copter is increasing in various industries for the purpose of performing classic tactical missions, logistics transportation, farm management, internet supply, video filming, weather management, life-saving, etc, and active technology development responding to market demand. Existing commercial multi-copter mainly use an electric energy propulsion system consisting of an electric battery and a brushless direct current (BLDC) motor. It is the limitations for usage in the flying time (up to 20 minutes) and payload (less than 20 kg). this study aims to overcome these limitations and expand the commercialization of engine-powered multi-copter of UAV in various industries in the futures.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.2
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• pp.164-170
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• 2016

The initial urban railway was only required to perform its role as means of transportation. As the time of staying in an underground platform was extended, it has been faced with the issues of environmental improvement as a living space. Therefore, the sliding automatic door, which is the basis of the screen door, is used widely for large distribution stores, hospitals, restaurants, and public offices for customers' convenience and as a convenient method to control access. Therefore, screen doors are required for the purpose of customers' convenience, securing safety, establishing pleasant station buildings, and energy savings. It would be also necessary to develop the optimal design technology for a screen door system through the design of element parts and to ensure reliability. Therefore, this paper calculated, interpreted, and verified the theoretical weight of the composition parts to verify the design drive hardness of the motor for screen doors necessary for the safety of subways.

• Journal of Aerospace System Engineering
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• v.13 no.3
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• pp.1-8
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• 2019

The electromagnetic forces generate a torque on the gimbal motor, and changes in the coil current causes torque ripple. This affects the gimbals' speed and results to unstable satellite attitude. It is therefore essential to reduce the torque ripple of the gimble motor with the aim of improving the attitude control accuracy of the satellite. This paper theoretically analyzes the torque generated from the modeling of a motor for general concentrated winding and distributed winding. The prototype was designed and fabricated through selection of the winding that reduces the torque ripple through simulation results. The results of the magnetic fields' theoretical analysis and the back electromotive force of the prototype were compared with the calibrated results for verification of conformity and manufacture of the design. The low-speed test proved that the torque ripple is reduced by improving the speed stability.

• Journal of Practical Engineering Education
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• v.10 no.1
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• pp.17-24
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• 2018

Through the design and production of works for the third semester as a major unit, It is proposed the process of satisfying the graduation standards with the design and production process of the drone which can be applied to various mobile environments. Using the shape of Ring Propeller, it is made to be able to play both the role of generating lift as a propeller and the role of a wheel that touches the ground through the surface of the rim. In addition, the Servo Motor is used to convert the drive shaft of the motor to the correct angle according to the command. Then, based on the idea, the 3D printing is implemented to confirm the result of the configuration, and the circuit for driving the propulsion is designed and manufactured. As a result, the conversion of the desired propulsion system during air navigation and operation failed due to the weight increase of the propellant. It is confirmed that the size of the thrust and the tolerance limit of the ring propeller are the errors. Through these processes, it has been recognized to have experience of creative thinking and cooperation through engineering approach and comprehensive design, and confirmed to satisfy the graduation criteria by writing an engineering paper on the result.