• Journal of Electrical Engineering and Technology
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• 제9권6호
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• pp.2201-2208
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• 2014

In this research, the characteristics of Brush-less DC (BLDC) motor in accordance with winding connection method, both Y-connection and D -connection, has been identified with design methodology simply. BLDC motor has been designed for both winding connections, and their torque analysis has been performed considering ideal current source analysis and voltage source analysis with 6-step control. In addition, to reduce torque ripple of BLDC motor, caused by coil inductance, on voltage source analysis with 6-step control, we have proposed suitable control method which is Phase Advance Control. It is verified that the torque ripple has been decreased by virtue of phase advance control, advancing and widening conduction angle of switching, via performance analysis by Finite Element Analysis.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.1169-1170
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• 2006

We made a high-speed motor and a DC brush-less motor for factory automation (FA) to investigate applicability of powder magnetic core to motor application, and compared those performances with the similar motors having conventional electro magnetic steel core. Permeability and saturated magnetization of powder magnetic core are less than those of elect romagnetic steel core, however output performances of each core motor are almost the same. The FA motor with powder magnetic core using three-dimensional magnetic circuit showed higher torque than the same volume motor with electromag netic steel core.

• Journal of Magnetics
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• 제20권2호
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• pp.166-175
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• 2015

In this study, we describe the design method of a Brush-less DC (BLDC) motor with delta winding connection. After designing delta winding connection model with the $60^{\circ}$ flat-top region of the Back Electro-Motive Force (BEMF), an ideal current source analysis and a voltage source analysis, with a 6-step control, were conducted primarily employing Finite Element Method. In addition, as a current controller, we considered the Current Regulator with PI controller using Simulink for the comparison of torque characteristics. When the input current is controlled, the switching regions and reference signals are determined by means of the phase BEMF zero-crossing point. In reality, the input current variation depends on the inductance as well as input voltage, and it causes a torque ripple after all. Therefore, each control method considered in this research showed different torque ripple results. Based on the comparison, the causes of the torque ripple have been verified in detail.

• Journal of Advanced Marine Engineering and Technology
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• 제40권9호
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• pp.805-811
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• 2016

본 논문은 플래너 버스바가 적용된 BLDC 전동기 드라이브 시스템에서, 직류단 캐패시터 전단 전류를 이용한 BLDC 전동기의 상전류 추정 알고리즘을 제안한다. 플래너 버스바는 기생 인덕턴스의 크기를 최소화하여 스위칭 시 스파크에 의한 소자 파손을 방지하고, EMC (ElectroMagnetic Compatibility) 특성을 향상시킨다. 하지만 플래너 버스바의 장점을 극대화하기 위해서는 직류단 캐패시터의 전단에 전류 센서를 설치할 수밖에 없는 구조적 제약이 따른다. 직류단 캐패시터 전단에 설치된 전류 센서는 캐패시터에 흐르는 전류와 인버터 입력전류의 합을 측정하게 된다. 따라서 직류단 캐패시터 전단 전류로부터 인버터의 입력전류를 정확하게 추출하는 것이 BLDC 전동기의 전류 제어를 위해서는 필수적이다. 본 논문에서는 BLDC 전동기의 온/오프 구간 동안의 등가 회로를 분석하여 캐패시터 전단 전류로부터 인버터 입력전류를 추정하는 알고리즘을 제안하였다. 제안된 알고리즘은 실험을 통해 그 타당성을 검증하였다.

• 한국전자통신학회논문지
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• 제18권5호
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• pp.827-834
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• 2023

본 연구에서는 자동차 송풍장치용 slotless Outer Rotor BLDC 모터를 설계하고 제작하여 기존의 모터들의 단점을 개선하였다. 제안된 모터는 Brush를 제거하여 회전 시 DC 모터의 기계적 마찰에 의한 소음을 해결하고, 구조적으로 Slotless Air-Gap 권선을 사용하여 BLDC 모터 슬롯에 의해 발생되는 코깅 토크를 개선하였다. 그리고 외부 회전자에 Magnet을 부착시키고 내부 회전자와 동시에 회전하기 때문에 자속의 변화가 생기지 않아 구조적으로 철손을 원천적으로 줄여 높은 효율을 가진다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(2)
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• pp.646-650
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• 2004

This paper presents a novel method to detect the rotor position of the BrushLess DC(BLDC) motor at standstill and a start-up method to accelerate the rotor up to a certain speed where the conventional position sensorless control methods based on the back EMF could work reasonably The proposed initial rotor position estimation method is suitable to avoid the temporary reverse rotation or the starting failure. This method can be implemented using only one current sensor at DC link of the inverter. It does not depend on the model of the motor , and it is robust to motor parameter variations. By the proposed method, it is demonstrated experimentally that a stable starting can be achieved even with severe mechanical disturbance.

• 전기학회논문지P
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• 제51권4호
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• pp.219-221
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• 2002

This paper presents an electric scooter development using blushless DC motor. In recent scooters was to develop for sport leisure and short transportation. Most of scooter are used petroleum gas. This gas scooter has disadvantage to pollute the air. Some of scooters have developed by DC motor which require a brush. However brushless motors have higher maximum speed and greater capacity, save maintenance labour and produce less noise. There is also greater freedom in planing the usage of brushless motors. In this paper we develop an electric scooter driving BLDC motor for design smart system and control speed of scooter with current reference signal to apply voltage to motor by means of three phase inverter. Using accelerator device we generate current reference to control speed and send the current to a MICOM by A/D converter. This MICOM produces the voltage signal and hall sensors signal and PWM controller drive three phase inverter to minimize error between the reference and an actual current.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.390-394
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• 2001

A dynamic simulation model for the brush less dc (BLDC) motor drives using Matlab is presented. In this model, an entire BLDC motor drive, including power conversion unit, BLDC motor, and speed/torque control system, is investigated. Especially, the PWM inverter is modeled using switching function concept, so that the detailed voltage and current waveforms, such as line-to-line voltages, inverter input current, ac line current, and switch/diode currents, can be obtained and average/rms ratings of the components can be easily calculated. Also, the proposed model is made into modular blocks and it can be easily extended to other ac motor applications with a little modification. The detailed modeling method is explained and its actual implementation is described. The validity of the proposed model is verified by various simulation results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.988-990
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• 2000

This paper presents the software control of a brush-less DC motor. Not only speed and current controls but also a real-time identification of the motor parameters can be implemented by software using the digital signal processor (DSP) TMS320F240. The DSP Controller TMS320F240 from Texas Instruments is suitable for a wide range of motor drives. TMS320F240 provides a single chip solution by integrating on-chip not only a high computational power but also all the peripherals necessary for electric motor control. The main benefits are increased system reliability and cost reduction of the overall system. The present paper describes how a speed controlled brushless DC drive can be implemented using TMS320F240.

• 전력전자학회논문지
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• 제6권6호
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• pp.498-505
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• 2001

본 논문은 PV어레이를 이용한 양수펌프 시스템의 전체적인 제어를 구상하는 제시하였으며, DC/DC 컨버터를 생략하기 위하여 BLDC 모터의 벡터제어를 이용하고 DC량과 AC량과 관계를 찾아내어 인버터만으로 PV 어레이의 최대출력점을 추적하였다. 기존의 최대출력점 제어기는 3상 인버터의 DC 링크단에 나타나는 전류리플로 인하여 제어기가 불안정하게 된다. 따라서 본 연구에서는 제어기의 불안정성을 보완하기 위해 BLDC 모터의 $i_qs$ 전류를 이용한 MPPT(Maximum Power Point Tacker) 제어 알고리즘을 구성하였다. 이러한 제어기의 우수함을 입증하기 위하여 J. A Domfnguez가 비동기모터에 적용한 제어방식을 BLDC 모터에 적용한 결과와 본 논문에서 제시한 제어방식을 시뮬레이션 및 실험을 통하여 비교 검토하고 하였다.