• Title/Summary/Keyword: electric machine

Search Result 112, Processing Time 0.368 seconds

Robust Optimization with Static Analysis Assisted Technique for Design of Electric Machine

  • Lee, Jae-Gil;Jung, Hyun-Kyo;Woo, Dong-Kyun
    • Journal of Electrical Engineering and Technology
    • /
    • v.13 no.6
    • /
    • pp.2262-2267
    • /
    • 2018
  • In electric machine design, there is a large computation cost for finite element analyses (FEA) when analyzing nonlinear characteristics in the machine Therefore, for the optimal design of an electric machine, designers commonly use an optimization algorithm capable of excellent convergence performance. However, robustness consideration, as this factor can guarantee machine performances capabilities within design uncertainties such as the manufacturing tolerance or external perturbations, is essential during the machine design process. Moreover, additional FEA is required to search robust optimum. To address this issue, this paper proposes a computationally efficient robust optimization algorithm. To reduce the computational burden of the FEA, the proposed algorithm employs a useful technique which termed static analysis assisted technique (SAAT). The proposed method is verified via the effective robust optimal design of electric machine to reduce cogging torque at a reasonable computational cost.

A New Breed of Electric Machines - Basic Analysis and Applications of Dual Mechanical Port Electric Machines

  • Xu Longya
    • Journal of Electrical Engineering and Technology
    • /
    • v.1 no.1
    • /
    • pp.73-79
    • /
    • 2006
  • Conceptually, mechanical port of an electric machine can be doubled and the concept of dual-mechanical-port (DMP) will then give birth to a new breed of electric machines. In this paper, the various possible structures of DMP electric machine are discussed. Basic modeling and analysis issues related to the DMP electric machine are presented. An exemplary design of DMP machine is given and verified by FEM results. Potential applications and future research work are given to conclude the paper.

A Study of a Manual Generator System for 50Wh Battery Charge (50Wh급 배터리 충전을 위한 휴대용 자가발전시스템 연구)

  • Lee, Ji-Young;Koo, Dae-Hyun;Han, Choong-Kyu
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.61 no.2
    • /
    • pp.223-230
    • /
    • 2012
  • This paper deals with an design of axial flux electric machine which is a key element for a compact size in a portable and manual generator system. It is expected that the generator system with an axial flux electric machine is more light and has higher efficiency than other types of generator systems. And it is used the soft magnetic composite core instead of silicon steel core in the axial flux electric machine for more compact size. The weight and efficiency of the generator system are the main keys to select the value of design variables. In this paper, the overall design process to meet the design goals, and the design results are presented with experiment results.

Characteristics of AC Treeing for Three Epoxy Resins for High Voltage Heavy Electric Machine Appliances (고전압 중전기기용 에폭시 수지 3종에 대한 교류트리잉 파괴특성)

  • Park, Jae-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.67 no.10
    • /
    • pp.1322-1329
    • /
    • 2018
  • In this paper, the reliability test of three kinds of epoxy resin for GIS Spacer, which is a high voltage based heavy electric machine, AC electrical treeing experiments were performed. Three types of epoxy resins, Araldite B41, CT 5531 CI and B46, have slight viscosity differences. An non-uniform electric field, E = 1149.4 kV/mm, as the needle to plate electrode, a power source with a frequency of 1 kHz was applied to the tree electrode for accelerated deterioration. The treeing phenomena of the three kinds of epoxy resin all initiated, propagated, and destroyed by the branch tree. Epoxy Resin B46 was 145 times longer than B41 and 53 times longer than CT 5531CI. I think that the choice of epoxy resin is very important in choosing high voltage heavy electric machine insulation materials.

Iron Loss Analysis of Electric Machine Considering Vector Magnetic Properties of Electrical Steel Sheet (전기강판의 벡터 자기특성을 고려한 전기기기의 손실특성 해석)

  • Yoon, Heesung;Koh, Chang Seop
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.61 no.12
    • /
    • pp.1813-1819
    • /
    • 2012
  • This paper presents vector magnetic properties of an electrical steel sheet (ESS) employed for electric machine and iron loss analysis considering the vector magnetic properties of the ESS. The vector magnetic properties of the ESS are measured by using a two-dimensional single sheet tester and modeled by an E&S vector hysteresis model to be applied to finite element method. The finite element analysis considering the vector magnetic properties is applied to iron loss analysis of a three-phase induction motor model, and the influences of the vector magnetic properties on the iron loss distribution are verified by comparing with numerical results from a typical B-H curve model.

Torque Analysis of Rotary Actuator Using Equvalent Magnetic Circuit method in combination with finite element method (등가자기회로법과 유한요소법을 이용한 액츄에이터의 토크특성 해석)

  • Kim, Young-Kyoun;Hong, Jung-Pyo;Kim, Je-Deok
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.605-607
    • /
    • 2000
  • Although Equvalent Magnetic Circuit (EMC) method. Using lumped parameter and numerical analysis method are widely used for electric machine analysis. these are neither always accurate enough nor sometimes available to easily use. Moreover three dimensional finite element method (3D-FEM) is inherently unsuitable for electric machine performance evaluation due to its poor computational efficiency, such as too long calculation time and difficulty in modeling for analysis. In this paper, Nonlinear Equivalent Magnetic Circuit (NEMC) method in combination with 2D-FEM is proposed to analyze the electric machine requiring 3D-FEM, and this method applys to torque evaluation for rotary actuator of Electro Magnetic Electronic Controller Power Steering (EM-ECPS).

  • PDF

A study and implementation of a 30kV highly isolated DC-DC converter (30kV 절연성능을 갖는 고절연 DC-DC 컨버터에 관한 연구)

  • Kim, Jeongwoo;Bu, Hanyoung;Cho, Younghoon;Kim, Ho-Sung;Cho, Jintae
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.355-356
    • /
    • 2017
  • In this paper, a highly isolated DC-DC converter is designed as a power supply, and an insulator-molded transformer is used to achieve high insulation performance. Finally, the insulation performance of the power supply was verified by experimental results.

  • PDF

Analysis of Torque Characteristic Considering The Dimensional Tolerance of BLDC Motor (치수공차를 고려한 BLDC 전동기의 토크 특성 해석)

  • Kim, Young-Kyoun;Hong, Jung-Pyo;Hur, Jin;Sung, Ha-Kyong
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.750-752
    • /
    • 2003
  • This paper presents a method of tolerance analysis for a electric machine. Tolerance analysis technique is required to find the tolerance band of design variables and estimate the characteristic distribution of the electric machine, because that manufacturing tolerances as well as measuring errors have a great influence on the electric machine. Therefore, this paper introduces Stochastic Response Surface Methodology to achieve the tolerance analysis. As an example, the tolerance analysis is applied to the analysis of torque characteristics for a BLDC motor from the electric point of view.

  • PDF

The Practical Method and Experimental Verification of Temperature Estimation in the Permanent Magnet of Electric Machine

  • Kang, Kyongho;Yu, Sukjin;Lee, Geunho;Lee, Byeong-Hwa
    • Journal of Magnetics
    • /
    • v.20 no.4
    • /
    • pp.421-426
    • /
    • 2015
  • This paper presents a practical method for estimation of average temperature in the permanent magnet (PM) of electric machine by using finite element analysis (FEA) and dynamo load experiment. First of all, the temperature effect of PM to the torque has been employed by FEA in order to evaluate the Temperature-Torque characteristic curve. The 1st order polynomial equation which is torque attenuation coefficient is derived by the FEA result of the Temperature-Torque curve. Next, torque saturation test with constant current condition is performed by dynamo load experiment. Then, the temperature trend can be estimated by adding the initial starting temperature using the torque attenuation coefficient and torque saturation curve. Lastly, estimated temperature is validated by infrared thermometer which measures temperature of PM surface. The comparison between the estimated result and experimental result gives a good agreement within a deviation of maximum $8^{\circ}C$.

The study on characteristics of operating limit of electric machine under the effects of Sag (순간전압강하에 대한 저압전기기기의 운전특성에 관한 연구)

  • Lee, Hyun-Chul;Gim, Jae-Hyeon;Jung, Sung-Won;Lee, Geun-Joon
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.113-114
    • /
    • 2008
  • For the supported high-technology, it is in need of estimation about power quality and reasonable price through machinism. The power system made much of precision digital industrial damage under sag. This study suggested electric machine under effects of power quality in the theory and test. A electric machine was simulated and experimented about sag. The test system made up IPC as voltage sag device. The test machine was magnetic contactor and PLC. The result, electric machines appeared to influence sag with CBEMA curve. It was make possible analysis of power system about a fault. This study was expected to method that investment and development of equipment on power market in the future.

  • PDF