• 제목/요약/키워드: Starting Method

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영구자석의 착자방향을 고려한 브러시리스DC 전동기의 효율 최적화 설계 (Efficiency Optimal Design of a Brushless DC Motor Considering the Magnetization Direction of Permanent Magnet)

  • 송정현;김병택
    • 제어로봇시스템학회논문지
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    • 제17권3호
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    • pp.241-247
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    • 2011
  • This paper is intended to improve efficiency of two-phase BLDC motor using analytical and statistical methods, and then the stability of the starting for the designed model is investigated. The characteristics of the motor according to magnetization directions of permanent magnet are analyzed through the analytical method, and design variables that affect the efficiency are selected. Preliminary optimal design is performed using the analytical method with the design variable. The RSM (Response Surface Method) based on the FEA (Finite Element Analysis) is applied to complement errors of the analytical method. As a result, the optimal design is determined. Finally, the stability of the starting for the optimal designed model is evaluated by analyzing cogging torque, and it is verified through the FEA.

반응표면법을 이용한 전기자동차 구동용 유도전동기의 회전자 슬롯형상 최적설계 (Optimal Design of Induction Motor Rotor Slot Shape for Electric Vehicle by Response Surface Method)

  • 전경원;한성진
    • 조명전기설비학회논문지
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    • 제25권11호
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    • pp.58-66
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    • 2011
  • In this paper, the starting torque and efficiency characteristics of the induction motor (IM) for the electric vehicle (EV) are improved by changing the slot shapes of squirrel cage. The initial model of the induction motor is designed by the loading distribution method (LDM), and then the rotor with squirrel cage of NEMA class A is selected to optimize the slot shape by response surface method(RSM). The design variables of rotor slot shape are obtained by the RSM. Starting torque and efficiency were calculated by the equivalent circuit method. As a result, starting torque and efficiency of the optimized model shows good performance through whole-speed range.

리액터 탭 절환에 의한 유도전동기의 기동 특성 (Starting Characterization of Induction Motor using Reactor Tap Change)

  • 김종겸
    • 전기학회논문지P
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    • 제63권1호
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    • pp.24-28
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    • 2014
  • An induction motor is most widely used to obtain driving force in the industrial field. The induction motor is generated a high current at starting. A starting current is often more than five times of rated current. A high starting current can cause problems such as voltage drop in the power system. In order to solve these problems, a reactor starting method has been widely applied in a large motor capacity. There are differences in the operating characteristics of induction motor corresponding the switching time of reactor tap. In this study, I analyzed that current, torque, power of induction motor are different from changing time and tap setting values of reactor tap.

디젤 엔진 저온 시동 시스템 최적화를 위한 엔진 시동 과정의 동적 모델링 및 시뮬레이션 (Dynamic Modelling and Simulation of Engine Starting Process for Optimization of Diesel Engine Cold Starting System)

  • 박정규;배근식;유천
    • 한국자동차공학회논문집
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    • 제8권1호
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    • pp.32-39
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    • 2000
  • To optimize the cold start process of a 4-stroke, 8 cylinder Diesel engine, a dynamic simulation model from cranking to idle speed is developed. Physically-based first order starter motor dynamics are used to model the performance of starting process which is very complex. These equations are solved using numerical schemes(Petzold-Gear BDF method) to describe the starting process of diesel engine and to study the effects of starting parameters. The validity of this model is examined by start test. This model can be served as a tool for computer aided control systems design to improve cold improve cold start performance.

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독립공리를 이용한 메인 스타팅 밸브의 분석 및 설계 (Analysis and Design of a Main Starting Valve Using Independence Axiom)

  • 배태성;박수철;박상일;이권희
    • 한국기계가공학회지
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    • 제9권5호
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    • pp.7-13
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    • 2010
  • Main starting valve is one of the main parts in the control system of diesel engines, purposed for starting main engines. It is composed of ball valve, check valve, actuator, etc. The design axioms provide a general framework for design methodology. Two axioms are independence axiom and information axiom. These axioms can be applied to all design process in a general way. The first axiom is introduced to analyze and evaluate the design of a main starting valve. The design parameters(DPS) are determined sequentially by considering the independence axiom. For the structural design of a main starting valve, the strength is calculated by using finite element method. In addition, the strength of its actuator piston is evaluated.

LSRM의 기동 안정성 개선을 위한 도체바 설계 (Conduction Bar Design to Improve Starting Stability of LSRM)

  • 정태욱;남혁;엄재부;엄상준;조성국;홍정표
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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    • pp.1168-1170
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    • 2005
  • This paper deals with the conductor bar design to improve starting stability of line-start synchronous reluctance motor(LSRM). As design variables, the number and the shape of conductor bars of rotor are chosen. The starting characteristics are calculated by finite element method(FEM) and the conductor bars are designed to improve the starting torque according to initial starting rotor position. Finally, the starting characteristic of the designed model are compared with that of the initial model.

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THE STARTING CHARACTERISTICS IMPROVEMENT OF SPIM WITH ONE-CHIP MICROCONTROLLER

  • Park, Su-Kang;Choi, Nak-Il;Cho, Geum-Bae;Oh, Keum-Gon;Baek, Hyung-Lae;Lim, Yang-Su
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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    • pp.321-324
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    • 1998
  • A single phase induction motor (SPIM) rated in fractional horsepower is widely used in home and industrial equipment: washing machines, fans, refrigerators, etc. In this paper, authors present the experimental results of the SPIM under controlling of currents of main and auxiliary windings by using a one-chip micro stator(OMS). This new starting method is developed to replace the conventional starting device consisted with a mechanical switch and a capacitor. In mentioned method, the soft-starting of SPIM is simply implemented and higher efficiency is obtained in comparison with conventional condenser type SPIM.

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원칩 마이컴을 이용한 단상유도전동기의 주권선 제어에 관한 연구 (A Study on the Main Winding Control of Single Phase Induction Motor using One-Chip Micom)

  • 박수강;백형래
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제49권1호
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    • pp.70-76
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    • 2000
  • This paper describes a one-chip micom controller and phase angle control method for self-starting and energy saving of single-phase induction motor. The proposed method is based on the optimal efficiency control which is running by variable phase angle of main winding current such as to maintain the maximum efficiency characteristics of the motor, in voltage control with TRIAC. Experiments are focused on a capacitor starting single-phase induction motor. The optimal energy saving by variable phase angle control are verified by experimental results. Also, auxiliary winding was controlled by electronic starting switch.

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비선형 최소자승법을 이용한 성장곡선 모형의 매개변수 추정시 초기값 설정 방법에 관한 연구 (Determination of starting values in estimating growth curves by using non-linear least squares)

  • 염세경;홍승표;강회일;김지수;전치혁
    • 산업공학
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    • 제14권2호
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    • pp.190-197
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    • 2001
  • Growth curves including Logistic and Gompertz functions are widely used in forecasting the market demand. To estimated the parameters of those functions, we use the non-linear least square method. However, it is difficult to set up the starting points for each parameter. If a wrong starting point is selected, the result reveals the local optimum or does not converge to a certain value. The purpose of this paper is to resolve the problem of selecting a starting point. Especially, rescaling the market data using the national economic index make it possible to figure out the range of parameters and to utilize the grid search method. Applications to some real data are also included.

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Sensorless Vector Control of a Wound Induction Motor Using MRAS with On-Line Stator Resistance Tuning

  • Lee Jae-Hak;Kim Yoon-Ho;Lee Houng-Gyun;Woo Hyuk-Jae
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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    • pp.462-465
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    • 2001
  • The wound induction motor can provide high starting torque and reduced starting current simultaneously by inserting large scale resistor. And this technique is one of the well known methods among the induction motor starting methods and generally used for heavy load starting such as Crain and Cement factories. The conventional PI controller has been widely used in industrial application due to the simple control algorithm and in general, PI controller is used for control of current, torque, position, and speed for the wound induction motor drive system. However, the system may result in poor performance since sensors have to be used, which in turn is limited by the environmental condition. Recently, to overcome these problems, many sensorless vector control methods for the wound induction motor have been studied. This paper presents MRAS method with on-line stator resistance tuning for sensorless vector control of the wound induction motor drive. In conventional MRAS method, in low frequency, stator resistance variation can result in poor performance. Therefore, to overcome several shortages of the conventional MRAS caused by parameter variation and enhance robustness of the sensor less vector control, this paper investigates a MRAS method with on-line stator resistance tuning for sensorless vector control of the wound induction motor. The validity and effectiveness of the proposed method is verified through digital simulation.

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