• 대한전기학회논문지
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• 제36권3호
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• pp.171-178
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• 1987

A study of two phase chopper system with four separate groups of DC motors in powering. A novel two phase chopper system with four separate groups of DC motors which applies the principles of two phase chopper with two separate groups of DC motors is dealt with this article. The main circuit consists of eight sets of chopping parts, four diodes and four separate groups of DC motors. Four groups of DC motors are driven through the series and parallel connections to each other in accordance with the operating conditions of the choppers. Although the proposed chopper circuit requires more circuit elements than the conventional two phase chopper system with combined output or two phase chopper system with two separate groups of DC motors, it has the following advantages` (1). It is possible to drive twice as much motors as conventional system does, using esisting receiving-and equipments and motors. (2). It is possible to control load voltage continuously from 0 to source voltage by changing time-ratio from 0 to 1. (3). Load current division becomes equalized. Therefore it is possible to drive not only series motors but also shunt and separately exited motors. (4). When smoothing reactor L is small, harmonic components of the proposed circuit is not so large. Therefore, the value of L can be determined from viewpoints of allowable value of ripple-ratio and current unbalance factor.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 추계종합학술대회
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• pp.325-328
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• 2003

본 연구는 인터넷을 통해서 실시간으로 전달되는 속도지령에 대해서 원거리에 위치한 로봇구동용 DC 전동기 동기화 제어에 관한 연구이다. 두 대의 DC 전동기 구동시스템에서 80C196KC $\mu$-Processor에 의해서 DC 전동기에 인가되는 PWM전압과 회전수의 관계로 PID제어기를 설계하고 임의의 속도(위치) 지령에 대해서 두 대의 전동기가 빠른 시간에 동기화가 될 수 있게 하였다. 또, 호환성이 뛰어난 Java 플랫폼을 기반의 Java Applet과 Servlet을 연동시켜 보안을 유지하면 인터넷 상에서 전동기를 실시간으로 제어하고, 속도를 모니터링 할 수 있게 하였다.

• Journal of Electrical Engineering and Technology
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• 제8권5호
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• pp.1049-1055
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• 2013

DC motors are widely used in industries like cement, paper manufacturing, etc., even today. Early fault identification in dc motors significantly improves its life time and reduces power consumption. Many conventional and soft computing techniques for fault identification in DC motors including a recent work using model based analysis with the help of fuzzy logic are available in literature. In this paper fuzzy logic and norm based wavelet analysis of startup transient current are proposed to identify and quantify the armature winding fault and bearing fault in DC motors, respectively. Results obtained by simulation using Matlab and Simulink are presented in this paper to validate the proposed work.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 A
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• pp.224-227
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• 1998

Linear motors are increasingly employed as direct actuators replacing the more conventional systems composed by a rotating motor and a mechanical device. Linear DC motor is useful in a high speed and high accuracy positioning system with a feedback controller. Because of these advantages, linear DC motors have already been used as motors of pen recorders and magnetic disk storage devices, these are moving coil type linear DC motors as these movers are light. Moving magnet type linear DC motor has advantages at long stroke motors because its mover's feeding wires for driving is not necessary. This paper is concerned with the analysis of linear DC motor that is moving magnet type with unipolar. In order to analyze the dynamic behaviour a mathematical model based on a simplified field analysis developed. A two dimensional finite element field solution is employed in order to illustrate the effect of yoke saturation and motor performance. It is deduced the relation between the limit value of the thrust of the linear DC motor and the dimension of the yokes.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.203-206
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• 1997

DC servo motors are widely used in many industrial fields as actuator of robot and driving power motors of electrical vehicle. Usually in the speed control systems, of motors, speed sensors are required and this fact results in the increased price and operating cost and the limited application of the motors. In this paper, a new speed control method for DC servo motor is proposed. In the scheme, the rotational speed is estimated by the measurement values of the armature voltage and current, instead of measurement by sensor. Optimal control theory is applied to design of the controller in construction of real system. This paper also report on the results of experiments to prove the validity of the proposed method.

• Journal of Advanced Marine Engineering and Technology
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• 제22권3호
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• pp.311-319
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• 1998

DC Motors have been widely used in industry as driving power motors for electrical vehicles cranes and winches due to their strong starting torques and as servo-motors for position and speed control systems due to their convenience of speed control etc. Generally in the speed control systems of motors speed sensors are required and this fact results in he increased price and operating cost and in the limitted applications. This paper presents a new speed control method for sensorless DC motors. In this scheme the speed signal is estimatd by the measurement values of the armature voltage and current. A Fuzzy feedback controller instead of the conventional PID controller. Through simulations the effectiveness and usefullness of the proposed method are illustrated.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
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• pp.41-44
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• 1986

Recently, the robot has been used in industries and laboratories for the automation and the coarse and hazardous environments. In this paepr, it was studied the robot using DC servo motors. In that maner, Gold Star educational robot "Top-1" which was drived by 6-step motors was rebuilt to the robot. "Kon Kuk-I" using 6-servo motors. Because the caracteristics of step motors were not fit well the differential change. For the precise robot control, it was designed the controller which was adopted the velocity mode control and the position mode control. It was studied also the supporting software for the robot motion. As the results of this experiments, it was found that the robot "Kon Kuk-I" moved smoothly and accurately.

• 대한전기학회논문지
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• 제34권3호
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• pp.115-123
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• 1985

A two phase chopper system with two separate groups of DC motors for regenerative braking is dealt with in this article. The main circuit consists of two sets of chopping parts, four diodes and two separate groups of DC motors. Although the proposed chopper circuit requires more circuit elements than the conventional two phase chopper system with combined output, it has the following advantages`(1). Ripple frequency of smoothing reactor current becomes twice as high as that of the conventional system, so the continuous current range and the ripple ratio are improved greatly. Therefore, the efficiency becomes even higher, the capacity of commutation equipment is reduced and the inductive interference become less.(2). Load current division becomes equalized. Therefore it is possible to drive not only series motors but also shunt, separately excited and compound motors.

• 한국인터넷방송통신학회논문지
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• 제21권2호
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• pp.131-136
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• 2021

직류 전동기 (DC Motor)는 유도전동기와 더불어 광범위한 영역에서 사용되고 있는 중요한 구동원이다. 비록 구조가 복잡하고 유지보수의 측면에서 불리한 점이 있어 오늘날 산업의 동력원으로서 대부분의 수요를 유도전동기에 내어준 상태이지만 우수한 제어성능으로 인하여 소형의 제어용 전동기로는 직류 전동기가 꾸준하게 사용되는 중이다. 또한 계자에 영구자석을 쓸 수 있는 구조로 자석재료의 발달과 더불어 고출력, 고효율 운전이 가능한 구조의 직류 전동기가 개발되고 있다. 그리고 인버터를 이용한 유도전동기의 경우보다 제어기의 구성이 단순하여 아직도 직류 전동기를 선호하는 수요도 무시할 수 없을 정도여서 여전히 중요한 동력원으로 자리를 차지하고 있는 전동기이다. 이러한 경향을 고려하여 본 논문에서는 시뮬레이션을 통한 모델링, EPLD를 이용한 PWM 발생회로 및 전동기구동회로, 프로세서 이용한 PI 제어 등의 하드웨어 구현을 통한 직류전동기의 제어성능을 살펴보고자 한다.

• Journal of Advanced Marine Engineering and Technology
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• 제23권3호
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• pp.292-299
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• 1999

DC motors are widely used in many industrial fields as the actuator of the robot and the driving power motors of the electrical vehicle, Usually in the sensors of DC motors such as the encoder the tachogenerator and the potentiometer etc. are applied, But usage of these sensors results in the increased price and operating cost such that the application of the motors are limitted. To solve this problem another method to construct low cost control system is investigates. In this paper a new speed control method for DC motor is proposed. This method uses motor parameters instead of using speed or position sensors. In this way the angular velocity is estimated by the measure-ment values of the armature voltage and current instead of measuring the sensor signal. This paper presents an alorithm for estimating the angular velocity of DC motor The effectiveness of the proposed method is verified by experimental results. Also the applicability of the proposed method is presented by applying to the velocity contol of a wheeled mobile robot.