• Title/Summary/Keyword: Electrical Design

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An Analytical Approach for Design of Nth-band FIR Digital Filters with Equi-Ripple Passband

  • Moon, Dong-Wook;Kim, Lark-Kyo;Lim, Cheng-Chew
    • Journal of Electrical Engineering and Technology
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    • v.4 no.3
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    • pp.423-428
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    • 2009
  • In FIR (Finite Impulse Response) filter applications, Nth-band FIR digital filters are known to be important due to their reduced computational requirements. The conventional methods for designing FIR filters use iterative approaches such as the well-known Parks-McClellan algorithm. The Parks-McClellan algorithm is also used to design Nth-band FIR digital filters after Mintzer's research. However, a disadvantage of the Parks-McClellan algorithm is that it needs a large amount of design time. This paper describes a direct design method for Nth-band FIR Filters using Chebyshev polynomials, which provides a reduced design time over indirect methods such as the Parks-McClellan algorithm. The response of the resulting filter is equi-ripple in passband. Our proposed method produces a passband response that is equi-ripple to within a minuscule error, comparable to that of Mintzer's design method which uses the Parks-McClellan algorithm.

The Optimal Design of Switched Reluctance Motor Using Progressive Quadratic Response Surface Method (점진적 2차 반응 표면 모델링 방법(PQRSM)을 이용한 SRM의 최적 설계)

  • Choi, Jae-Hak;Jung, Sung-In;Park, Jae-Bum;Lee, Ju;Hong, Kyung-Jin;Choi, Dong-Hoon
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.595-597
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    • 2002
  • This paper presents an optimum design, which is able to determine optimal geometric and electric parameters of Switched Reluctance Motor so as to fit respective operating conditions specified in various industrial fields. Those works describe an approach to maximize the average torque while keeping the torque ripple within 10${\sim}$100(%) of respective limited values. This optimum design is obtained by uniting an optimization algorithm of PQRSM to a time stepping finite element method.

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Design of high speed linear switched reluctance motor (고속 직선형 스위치드 릴럭턴스 전동기의 설계)

  • Jang, Seok-Myeong;Park, Ji-Hoon;Choi, Jang-Young;You, Dae-Joon;Sung, Ho-Kyung
    • Proceedings of the KIEE Conference
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    • 2007.04c
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    • pp.62-64
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    • 2007
  • This paper deals with design of high speed linear switched reluctance motor(LSRM). First, we derived design factor from pole arc ratio of stator and mover, and calculated time constant using inductance and resistance. Second, we decided design parameter from design factor using time constant. Finally, analyze characteristics for LSRM using finite element analysis.

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Study on the Design of Line-Start Synchronous Reluctance Motor Replacing Induction Motor (유도전동기 대체 라인기동식 동기형 릴럭턴스 전동기 회전자의 설계 연구)

  • Liu, Huai-Cong;Lee, Sang-Don;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.11
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    • pp.1813-1819
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    • 2016
  • In this paper, LS-SynRM (Line Start-Synchronous Reluctance Motor) has been attracting attention in replace of induction motor which hardly provides high efficiency. Compared to induction motor, LS-SynRM has better efficiency per unit area. This study demonstrated the electromagnetic design methods of LS-SynRM while maintaining the frame of existing IE3 induction motor for blower. We documented the design procedures for generating high saliency which is the most essential and mechanical stress analysis is also treated. In conclusion, we proved the validity of our design by manufacturing and testing our LS-SynRM models.

Topology Design of BLDC Motor for Cogging Torque Reduction and Characteristic Analysis (코깅토크 저감을 위한 BLDC 전동기의 형상 설계 및 특성 분석)

  • Seo, Kyung-Sik;Jung, Sang-Yong;Lee, Cheol-Gyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.11
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    • pp.1519-1525
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    • 2014
  • This paper presents the shape design for reducing cogging torque and characteristic analysis in Brushless DC (BLDC) motor. In this BLDC motor, ${\Delta}$(delta)-winding is applied, and in order to obtain the $60^{\circ}$ trapezoidal phase back-EMF waveform, permanent magnet shape design is carried out. And then, a method on specifying design parameters to effectively reduce cogging torque is developed. back-EMF, input voltage and input current which are analyzed by the Finite Element Method (FEM) are validated by experimental results. Also, efficiency calculations based on analysis and experimental results are performed and analyzed.

Design Solutions to Minimize Iron Gore Loss in Synchronous Reluctance Motors Using Preisach Model & FEM (프라이자흐 모델이 결합된 유한요소 해석을 이용한 동기형 릴럭턴스 전동기의 철손 최소화 회전자 구조 설계)

  • Lee, D.D.;Lee, M.M.;Sim, J.M.;Lee, J.H.
    • Proceedings of the KIEE Conference
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    • 2002.11d
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    • pp.138-140
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    • 2002
  • This paper deals with an automatic design procedure for the minimization of iron core loss in a synchronous reluctance motor (SynRM). The focus of this paper is the design relative to hysteresis loss on the basis of rotor shape of a SynRM in the same torque density. The coupled Finite Elements Analysis (FEA) & Preisach model have been used to evaluate the iron core loss with the rotor shape. The proposed procedure allows to define the rotor geometric dimensions starting from an existing motor or a preliminary design. The iron loss has been reduced with a rotor design variation.

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The Optimal Design of Passive Shimming Elements for High Homogeneous Permanent Magnets Utilizing Sensitivity Analysis

  • Yao, Yingying;Choi, Yong-Kwon;Koh, Chang-Seop
    • Journal of Electrical Engineering and Technology
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    • v.1 no.4
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    • pp.461-465
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    • 2006
  • This paper presents a useful and simple method to design the passive skimming system for homogeneous permanent magnets based on numerical optimization. To simulate the effects of manufacturing and assembling tolerances, the actual geometrical parameter of the magnet with a derivation is suggested. Then, the optimal design model oi a passive shim system is set up to correct the derivative of field homogeneity. The numbers, sizes and locations of the passive shims are optimized by the steepest descent algorithm combined with design sensitivity analysis. Two implementations show that the proposed method can achieve the required homogeneity of the field with the minimum quantity of ferromagnetics.

A New Sensitivity-Based Reliability Calculation Algorithm in the Optimal Design of Electromagnetic Devices

  • Ren, Ziyan;Zhang, Dianhai;Koh, Chang Seop
    • Journal of Electrical Engineering and Technology
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    • v.8 no.2
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    • pp.331-338
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    • 2013
  • A new reliability calculation method is proposed based on design sensitivity analysis by the finite element method for nonlinear performance constraints in the optimal design of electromagnetic devices. In the proposed method, the reliability of a given design is calculated by using the Monte Carlo simulation (MCS) method after approximating a constraint function to a linear one in the confidence interval with the help of its sensitivity information. The validity and numerical efficiency of the proposed sensitivity-assisted MCS method are investigated by comparing its numerical results with those obtained by using the conventional MCS method and the first-order reliability method for analytic functions and the TEAM Workshop Problem 22.

THE DESIGN AND ANALYSIS PROGRAM FOR THE DEVELOPMENT OF LEO SATELLITE ELECTRICAL POWER SUBSYSTEM (저궤도 인공위성 전력계 개발을 위한 설계 분석 프로그램)

  • Lee, Sang-Kon;Ra, Sung-Woong
    • Journal of Astronomy and Space Sciences
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    • v.24 no.2
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    • pp.179-194
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    • 2007
  • The design and analysis of satellite power subsystem is an important driver for the mass, size, and capability of the satellite. Every other satellite subsystem is affected by the power subsystem, and in particular, important issues such as launch vehicle selection, thermal design, and structural design are largely influenced by the capabilities and limitations of the power system. This paper introduces a new electrical power subsystem design program for the rapid development of LEO satellite and shows an example of design results using other LEO satellite design data. The results shows that the proposed design program can be used the optimum sizing and the analytical prediction of the on-orbit performance of satellite electrical power subsystem.

Multi-Objective Optimization of Electromagnetic Device Based on Design Sensitivity Analysis and Reliability Analysis (설계 민감도와 신뢰도 분석에 근거한 전자기기의 다목적 최적화)

  • Ren, Ziyan;Zhang, Dianhai;Park, Chanhyuk;Koh, Chang Seop
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.1
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    • pp.49-56
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    • 2013
  • In this paper, for constrained optimization problem, one multi-objective optimization algorithm that ensures both performance robustness and constraint feasibility is proposed when uncertainties are involved in design variables. In the proposed algorithm, the gradient index of objective function assisted by design sensitivity with the help of finite element method is applied to evaluate robustness; the reliability calculated by the sensitivity-assisted Monte Carlo simulation method is used to assess the feasibility of constraint function. As a demonstration, the performance and numerical efficiency of the proposed method is investigated through application to the optimal design of TEAM problem 22--a superconducting magnetic energy storage system.