• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.11
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• pp.1894-1899
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• 2016

In this paper, because the position sensor represents the important factor in BLDC (Brushless DC) motor drives, BLDC motor is necessary that the three Hall-sensors evenly be distributed around the stator circumference in case of the 3 phase motor. The Hall-sensor is set up in this motor to detect the main flux from the rotor. So the output signal from Hall-sensor is used to drive IGBT to control the stator winding current. However, in case of breakdown Hall sensor, we research that the estimation algorithm of Hall sensor signal to detect rotor position and for the speed feedback signals with BLDC motor whose six stator and two rotor designed. In addition, this paper presents a sensorless speed control of BLDC Motor using terminal voltage of the one phase. Rotor position information is extracted by indirectly sensing the back EMF from only one of the three terminal voltages for a three-phase BLDC motor.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.1018-1019
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• 2006

BLDC(Brushless DC) 전동기는 브러시(brush) 방식 DC 전동기의 브러시와 정류자를 반도체 소자를 이용한 인버터로 대체한 것으로 높은 효율과 제어의 용이성 때문에 최근 많이 사용되고 있다. 하지만 회전자의 위치 정보에 의해 정류를 하므로 회전자 위치 센서가 필요하고 그에 따라 전동기의 구조가 복잡하게 되고 작동 환경에 제한을 받게 된다. 본 논문에서는 위치 센서 없이 고정자의 권선에 유기되는 역기전력을 이용한 센서리스(sensorless) BLDC 전동기의 토크리플 저감에 대하여 연구하였다. BLDC 전동기를 수학적으로 모델링하여 센서리스 BLDC 전동기의 토크리플 제어 알고리즘을 구성하고 시뮬레이션과 실험을 통하여 그 결과를 검토하였다. 또한 기존 센서 부착형 BLDC 전동기와 비교하여 그 타당성을 입증하였다.

• Transactions of the Korean Society of Automotive Engineers
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• v.16 no.5
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• pp.92-99
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• 2008

This paper describes an signal processing method for the hall sensorless position control of ETC control system using a BLDC motor. The proposed ETC control system, which is mainly consisted of a BLDC motor, a throttle plate, a return spring and reduction gear, has a position sensor with an analog voltage output on the throttle valve instead of BLDC motor for detecting rotor position of motor. So the additional commutation information is necessarily needed to control the mentioned ETC module. In order to estimate and determine the commutation state, it is proposed to properly manipulate the resolution of A/D converter considering the mechanical parameter, that is, the number of motor slot and the ratio of reduction gear. Through this method, the estimation of commutation state for operating the system is possible and the discrete signal for commutation is stably obtained. The validity of the method is examined through the experimental results.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.919_920
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• 2009

본 논문에서는 Full-digitalize 구현으로 부가적인 회로가 필요 없는 EHPS용 BLDC 모터의 센서리스 제어 알고리즘을 제안한다. 제안된 알고리즘을 일반적인 영점검출방법 및 역기전력 추정 센서리스 방법과 비교 분석하고 시뮬레이션을 통해 타당성을 검증한다

• Journal of the Korean Society for Precision Engineering
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• v.25 no.5
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• pp.15-21
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• 2008

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.10
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• pp.97-103
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• 2008

Recently, it is increased to apply sensorless drive for BLDC (Brushless DC) motor to household electrical appliances, especially in the refrigerators and air conditioners, to reduce the cost and the acoustic noise by the operation and to make their functions more comfortable for human beings. In this paper, low-cost sensorless drive for BLDE motor is implemented by random PWM (Pulse Width Modulation). The experimental results show that the electromagnetic noise was reduced and the sound quality was improved by BLDC motor sensorless random PWM Control.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2761-2763
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• 1999

In this paper, we analyzed the characteristics of the detected EMF signals used to detect the rotor position in the IPM(Interior Permanent Magnet) BLDC motor and SPM (Surface Permanent Magnet) BLDC motor. The position sensing signal, in the IPM BLDC motors, advances the real rotor position due to the variation of the rotor inductances. This fact was verified by the simulation and experiment.

• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.325-327
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• 2007

This paper proposes a novel sensorless fault detection algorithm for a brushless DC(BLDC) motor drive system. This proposed method is configured without the additional sensor for fault detection and identification. The fault detection and identification are achieved by a simple algorithm using the operating characteristic of the BLDC motor. This proposed method can also be embedded into existing BLDC motor drive systems as a subroutine without excessive computational effort. The feasibility of a novel sensorless fault detection algorithm is validated in simulation.

• Journal of Electrical Engineering and Technology
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• v.12 no.1
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• pp.466-471
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• 2017

Pantograph must be correctly attached to catenary to continuously supply stable power to railway vehicle, and the device used here is Auxiliary Air Compressor (ACM). The existing ACM used the DC motor that included commutator and brush. Since maintenance and repair by mechanical friction are essential for the DC motor, BLDC motor studies have been conducted to improve this. A three-phase BLDC motor does $120^{\circ}$ two-phase commutation through hall sensors in general. However, since hall sensor is vulnerable to heat and can run only when all three sensors work normally, sensorless control method has been studied to solve this. Using back EMF Zero Crossing Point (ZCP) detection method, this paper will introduce a stable switching sensing method that has a non-commutation area in a low speed zone.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.63 no.1
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• pp.35-41
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• 2014

This paper presents a design method of programmable low pass filter(PLPF) which reduce an estimation error of a zero crossing point(ZCP) for a high speed brushless DC(BLDC) motor drive. BLDC motor sensorless drive is possible by estimation of ZCP. The ZCP estimated by detecting a change of back-EMF polarity has the estimation error because noises exist on the measured back-EMF. Therefore a calculated commutation timing using the ZCP is inaccurate. And the inexact commutation timing leads to ripples of 3-phase current and degradation of drive performance. This paper proposes the design method of the PLPF to overcome these problems. First, a speed calculated a inaccurate period of the ZCP is analyzed in the frequency domain. Then, the PLPF that has varying cut-off frequency according to change of the speed is designed on the frequency analysis result. The proposed method is verified by the experiment.