• 한국자동차공학회논문집
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• 제16권5호
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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.

• 전기학회논문지
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• 제66권11호
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• pp.1663-1668
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• 2017

A BLDC motor with higher number of phases has several advantages, compared to the conventional three-phase BLDC motors. It can reduce the commutation torque ripple and the iron loss without increasing the voltage per phase and increase the reliability and power density. Higher number of phases increase the torque-per-ampere ratio for the same machine volume and output power by widening the electrical conduction period. In this paper, the proposed seven-phase BLDC motor drive system is made into several functional modular blocks, so that it can be easily extended to other ac motor applications: back-EMF block, hysteresis current control block, pwm inverter block, phase current block, and speed/torque control block. Also in a system of BLDC motor drive, the PI controller has been widely used in the speed controller because of the simple implementation. To obtain a good speed response in a general drive system using the PI controller, the high bandwidth of a controller is established. therefore, in this paper, a Fuzzy controller is applied to the 7-phase BLDC motor drive system in order to improve the speed control performance. The Fuzzy controller is compared with a conventional PI controller through the experiment with respect to speed dynamic responses. These experimental results show that the Fuzzy controller of the 7-phase BLDC motor drive system is superior over the conventional PI controller. The algorithm using the Fuzzy controller can improve a comfortable ride in the field of high performance 7-phase BLDC motor drive applications.

• 한국군사과학기술학회지
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• 제4권2호
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• pp.179-188
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• 2001

The objective of this paper is to design and implement sliding mode control scheme for an actuation system using BLDC motor. Since the dynamic characteristics of this system with unknown disturbance and parameter variations are very complicated and highly nonlinear, the conventional linear control approaches may not guarantee satisfactory control performances. In order to improve the dynamic performances of this system, a model following sliding mode control(MFSMC) with perturbation estimation approach is designed and implemented. It eliminates the conventional requirements for the knowledge of uncertainty upper boundary. The effectiveness of this control approach is verified by comparison with a PID control through a series of simulation and experimental studies.

• 대한전기학회논문지
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• 제45권1호
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• pp.60-66
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• 1996

Brushless DC(BLDC) motor have been increasingly used in machine tools and robotics applications due to the reliability and the efficiency. In control of BLDC motor, it is important to construct the controller which is robust to parameter variations and external disturbances. Variable structure controller(VSC) has been known as a powerful tool in robust control of time varying systems. In practical systems, however, VSC has a high frequency chattering which deteriorates system performances. In this paper, a binary controller(BC) which takes the form of VSC and MRAC combined is presented to solve this problem. BC consists of the primary loop controller and the external loop controller to change the gain of primary loop controller smoothly. So it can generate the continuous control input and is insensitive to parameter variations in the given domain. To confirm the validity, various investigations of control characteristics for various design parameters in a position control system of BLDC motor are carried out. (author). 11 refs., 18 figs., 1 tab.

• 한국전자통신학회논문지
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• 제15권3호
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• pp.503-512
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• 2020

송풍기를 이용한 제품으로는 핸드드라이기, 자동세차기, 건조기, 청소기등이 있다. 이러한 전동기의 특징은 순간에 강한 바람이 나오도록 구조, 제어 알고리즘이 필요하다. 종래의 여자방식에 따른 전동기는 직권식, 분권식, 복권식, 영구자석식이 있다. 이러한 전동기는 고속 회전 시 기동전류가 크고 회전수가 불규칙한 단점이 있다. 이를 개선하고자 고속BLDC 전동기 제어에 관한 연구로 구동회로 설계, 센서리스 제어 알고리즘, 시뮬레이션, 실험 등을 통해 800W급 고속BLDC 모터 제어와 회로 설계하였고, 95% 이상 고효율을 제어기의 운전성능 평가 방법, 시제품 실험 및 검증을 연구하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.627-628
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• 2006

Miniature BLDC is widely used in industrial applications because of high driving efficiency and high torque characteristic. Otherwise the general BLDC, torque ripple of a high speed miniature BLDC is serous during conduction due to the very low electrical time constant. This paper present instant voltage and current control for torque ripple reduction of a high speed miniature BLDC. Computer simulation and experiment test for 40,000 rpm miniature BLDC show the verification of the proposed control method.

• 전기학회논문지
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• 제65권5호
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• pp.868-872
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• 2016

This paper presents the design of a BLDC motor driver applicable to various valve control systems using smart devices. BLDC motors are relatively small in size and have better performance than other motors. They help in reducing maintenance cost, installation costs and power consumption in plant facilities. The proposed driver is specially designed for BLDC motors using Smart Communication Platform. It adds smart features in the valve control system using BLDC motors such as multi-management, control, networking and monitoring in real time with the help of smart devices.

• Journal of Advanced Marine Engineering and Technology
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• 제33권6호
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• pp.939-945
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• 2009

This paper is described BLDC motor in the submarine propulsion system which is asked high power per unit area. This study analyzes the independent 6-phase BLDC motor a specific extended by existing the independent 3-phase BLDC motor and propose forward development direction. Independent 6-phase motor has a characteristics that phases of stator are independent electrically with each other and two's independence 3-phase BLDC motor are linked with each difference of 60 degree. Six-phase BLDC motor is simulated with Matlab-simulink, the simulation result has a high current and low torque pulsation than existent independence 3-phase BLDC motor.

• 한국자동차공학회논문집
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• 제21권2호
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• pp.114-121
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• 2013

High efficiency operation is required for motors of vehicle to increase fuel efficiency due to the regulation of exhaust gas. This paper presents a control method of fuel pressure to increase fuel efficiency and a sensorless control method of BLDC motor to get higher efficiency than conventional brushed DC motor. Initial rotor position of BLDC motor is detected from current value that is occurred by test voltage pulse and rotor is accelerated by defined sequence to enter sensorless operation mode. The algorithm to control flow rate of fuel pump uses PI controller that is control motor speed to maintain the target fuel pressure commanded by ECU.

• 한국정보통신학회논문지
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• 제16권5호
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• pp.1095-1101
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• 2012

본 논문은 DSP 제어기와 IGBT 구동기를 이용하는 조립과 공급의 자동처리를 위한 BLDC 서보 모터 제어시스템 설계를 제안한다. 조립, 공급 자동처리 시스템은 다양한 동작을 위해 서보모터의 토크, 속도, 위치 제어를 필요로한다. 본 논문은 이러한 서보제어를 벡터제어와 공간벡터 PWM 기법을 이용하여 구현한다. 제어기의 CPU 로서 PWM 파형발생기, A/D 컨버터, SPI 통신 포트 및 많은 입/출력 포트를 갖는 TMS320F240 DSP를 채택하였다. 이 제어시스템은 메인 호스트 PC 가 위로부터의 명령을 전달하고 끝단의 서보제어기의 상태들을 모니터링하는 세 개의 부 DSP시스템을 관리하는 3레벨의 계층적 구조로 이루어져 있다. 각 부 DSP 시스템은 DSP와 IPM을 사용하여 BLDC 서보모터를 제어하는 8개의 BLDC 서보모터제어부를 운영한다. 호스트 시스템과 중간의 DSP는 RS-422을 이용하여 통신하며, 주프로세서와 제어기는 SPI 포트를 이용하여 통신한다.