• Proceedings of the KIEE Conference
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• 2007.10c
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• pp.175-177
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• 2007

This paper presents for the torque characteristics and improving the efficiency of driving system of electric bicycle which applied IEWPM(Independently Excited Winding Permanent Magnet) motor. IEWPM motor can expand the number of phase from 3 phases to multiphase like SRM motor because stator windings are unconnected directly. BLDC motor raise rotor'-s electromagnetic torque per unit volume by using Spoke type permanent magnet. By using two photo sensor per phase and applying excited width, advance angle and bipolar control, we confirmed higher torque at a low speed, higher out-put at a high speed, and efficiency improvement at a wide speed control area.

• Proceedings of the IEEK Conference
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• 2009.05a
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• pp.313-315
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• 2009

In this thesis, A methodology of system implement for PID controller, PWM logic, HSC logic, Host Communication and external DAC interface are implemented into single FPGA chip is proposed. The implemented system is used to control the speed of DC servo motor. A DATA block transfers set point value(SV) and P, I, D gain parameters to the corresponding Blocks respectively by the Host Communication to Computer. A HSC block generates process value(PV) by a pulse and $90^{\circ}$ shifted pulse from the encoder A PID block makes error(E) signal from the set value and process value and output manufacture value(MV) through the PID controller. In PWM block using the MV from the PID block, drives H-bridge controlling the Motor. Also DAC interface controls the DAC to graph the digital signal such as SV, PV, E, MV in FPGA onto the Oscilloscope.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.353-356
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• 2008

This paper is proposed that the photovoltaic/fuel cell hybrid generation system for the stand-alone system. In case of the photovoltaic generation system, it depends on the weather condition, irradiation and so on... On the contrary, fuel cell has not this limitation. It can be interactive generation system between photovoltaic and fuel cell. This paper simulated stand-alone co-generation system based on the control of DC link. Moreover, 1[kw] BLDC motor system with speed and hysteresis current controller is used for the proposed system.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.07a
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• pp.269-270
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• 2017

본 연구에서는 부력조형물이 정해진 위치에서 사용자가 원하는 자세를 유지할 수 있는 시스템을 연구하였다. 기존의 부력조형물은 로프를 이용한 고정식이었지만 본 기술이 적용된 부력조형물은 로프 없이 스스로 부력에 의한 공중부양과 사용자가 원하는 자세를 취할 수가 있도록 구성하였다. 이러한 시스템은 주로 홍보용으로 널리 사용되며 박람회, 제품 설명회, 지역축제, 예술 등 많은 분야에 적용이 가능하다. 부력조형물이 자세를 유지하기 위하여 드론 기술에 적용되는 IMU 센서를 이용한 방향과 자세정보와 6개의 BLDC 모터에 8인치 프로펠러를 접합시켜 부력조형물이 상하좌우로 이동이 가능하도록 자세 제어장치를 구성하였으며 실험을 통하여 시스템의 검증하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.355-356
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• 2018

본 연구에서는 드론 기술을 응용한 부력조형물의 수평 및 수직 자세제어에 관한 연구를 수행 하였다. 기존의 공중부양 조형물은 헬륨 Gas를 이용한 애드벌룬이 대표적으로 로프를 이용한 단순한 공중부양 조형물이었다. 본 연구에서는 이러한 공중부양 조형물에 로프를 없애고 드론 기술을 응용한 프로펠러로 공중부양 조형물의 자세를 제어하는 방법을 연구하였다. 시스템 구성은 단일 제어기로서의 역할보다 시스템 구성요소로서의 역할이 매우 중요해지므로 조형물의 제어시스템, 다양한 센서등의 연동되어지는 전체의 제어기로 확장시켜 사용되는 퓨전 시스템의 방향으로 구성하였다. 부력조형물의 수평 및 수직제어를 위하여 사용된 센서는 2축의 자이로센서와 3축의 가속도센서를 사용하였다. 프로펠러와 연결된 BLDC모터를 효율적으로 제어하기 위한 알고리즘으로 PI 알고리즘을 이용하였다. 시스템의 성능 향상을 위한 효율적인 동적 작업부하 균등화와 시스템 자원인 CPU와 메모리를 효율적으로 사용하여 고성능 컴퓨팅 시스템의 처리량을 최소화하고, 센싱 및 제어의 수행시간을 최소화하였다. 본 연구에서는 PI 알고리즘을 시스템에 적용하여 응답특성 실험을 행한 결과 시뮬레이션에 의한 응답 결과와 잘 일치하였으며 그 유용성이 검증하였다.

• Journal of Institute of Control, Robotics and Systems
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• v.17 no.3
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• pp.241-247
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• 2011

This paper is intended to improve efficiency of two-phase BLDC motor using analytical and statistical methods, and then the stability of the starting for the designed model is investigated. The characteristics of the motor according to magnetization directions of permanent magnet are analyzed through the analytical method, and design variables that affect the efficiency are selected. Preliminary optimal design is performed using the analytical method with the design variable. The RSM (Response Surface Method) based on the FEA (Finite Element Analysis) is applied to complement errors of the analytical method. As a result, the optimal design is determined. Finally, the stability of the starting for the optimal designed model is evaluated by analyzing cogging torque, and it is verified through the FEA.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.11a
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• pp.409-414
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• 2005

We are interaction refrigeration warehouse cold water pump system and photovoltaic generation system. At this time, a target pressure is able to control in spite of change of the pressure according to pump head and rate of flow of pump. Also, we carry out the vector control of BLDC moor with the maximum torque operation and a high reliability from territory of each operation speed. Therefore, in this paper, we conclude energy saving technique of refrigeration warehouse cold water pump system.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1294-1296
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• 2005

Because of its cost effectiveness, the Brushless DC Motor(BLDCM) is focused by the industry these days. Considering the constant back-EMF region of the BLDCM, only a simple position information should be provided for constant torque control. From this point of view, using expensive position sensors, such as encoder, resolver, etc, decreases the cost effectiveness of the BLDCM. The Proposed detecting circuit detects position of zero crossing point(ZCP) then relative position could be calculated from ZCP. This circuit is robust to noise because of working in the current level. BLDCM is driven from the position information by the ZCP The reliability on BLDCM sensorless control using the voltage detecting circuit is shown through simulation using Matlab.

• Journal of the Korean Society for Precision Engineering
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• v.27 no.6
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• pp.39-46
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• 2010

Linear induction motor is adopted as an actuator of the planar stage. An inherently poor characteristic at zero or ultra-low speed zone of the induction motor is remarkably improved due to a recent development of power electronic semiconductor technology and a spatial vector control theory. At present, a servo response speed of the induction motor reaches 90 percent of one of PM synchronous or BLDC motor. Specially, as a secondary of the induction motor can be constructed using uniform conducting sheets, there is no periodic force ripple as in PM motors. So, the induction motor can be superior to another driving means under a certain condition. This paper discusses the overall development procedure of non-contact planar stage with a big workspace using linear induction motors.

• Journal of Institute of Control, Robotics and Systems
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• v.15 no.7
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• pp.675-682
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• 2009

Instead of direct driving like BLDC, the induction principle is adopted as a driving one for planar stage. The stage composed of four linear induction motors put in square type is activated by two-axial forces; low-frequency attractive force and thrust force of the linear induction motors. Here, the modified vector control whose new inputs are q-axis current and dc current biased to three phase current instead of d-axis current or flux current is applied extensively to overall motion of the stage. For the developed system, the precision step test and the constant velocity test are tried to guarantee its feasibility for TFT-LCD pattern inspection. However, to exclude a discontinuity due to phase shift and minimize a force ripple synchronized with the command frequency, the initial system is revised to the antagonistic structure over the full degree of freedom. Concretely describing, the porous air bearings guide an air-gapping of the stage up and down and a pair of liner induction motors instead of single motor are activated in the opposite direction each other. The performances of the above systems are compared from trapezoid tracking test and sinusoidal test.