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황형진(H.J. Hwang),원태현(T.H. Won),안진우(J.W. Ahn) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
This paper presents a design and characteristics analysis of a SRM drive for EPS application A conventional driving room space and mechanical structure are suggested in design stage In the restricted design conditions, motor parameters are determined for sufficient torque and speed For the smooth torque generation and simple circuit of power system, 12/8 motor drive is considered. With FEM and magnetic circuit analysis, designed motor is simulated to meet the requirement of specifications. Effectiveness of the suggested SRM drive for EPS application is verified by the manufactured prototype motor drive tests.<br/>
α-레벨 퍼지집합 분해에 의한 직류 서보제어용 퍼지 PI+PD 로직회로 구현
홍정표(J.P. Hong),원태현(T.H. Won),정종원(J.W. Jeong),이영수(Y.S. Lee),이상무(S.M. Lee),홍순일(S.I. Hong) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
This paper describes a method of approximate reasoning for fuzzy control of servo system, based on decomposition of α-level fuzzy sets. It is propose that logic circuits for fuzzy PI+PD are a body from fuzzy inference to defuzzificaion in cases where the output variable u directly is generated PWM. The effectiveness for robust and faster response of the fuzzy control scheme is verified for a variable parameter by comparison with a PID control and fuzzy control. A position control of DC servo system with a fuzzy logic controller successfully demonstrated.
홍정표(J.P.Hong),박성준(S.J.Park),원태현(T.H.Won),권순재(S.J.Kwon) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
In a motor driving, the current rate is directly related to the rate of a switching device and in cost reduction, the parallel switching operation is the alternatives because It has the smaller current rate through current 야vision There are many Investigations for the parallel switching operations to equaling the current division However It remains many problems for practical usage The reason is that the switching characteristics are mainly relied on the different saturation voltage of each device etc. and these factors are not altered by circuit designer In order to compensate this problem, a proper resistance is experimently Inserted to the switching device But this method can not be the optimal solution Therefore this paper proposes a new parallel operation which uses a parallel phase winding to remove the traditional effect of switching device such as saturation voltage according to the division of current Also the reliable and stable driving is Improved through experiments and the detailed principles
홍정표(J.P. Hong),손정기(J.K. Son),원태현(T.H Won),권순재(S.J. Kwon),홍순일(S.I. Hong),김종달(J.D. Kim) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
Position controls are very important in semiconductor manufacturing devices, machine tools precision measuring instruments, etc. In this paper, a novel encoder of digital and analog hybrid type is proposed. It is shown that from this experiment a high-resolution angle measurement device can be designed by a low cost incremental encoder.