Showing papers by "Seok-Myeong Jang published in 2007"
TL;DR: The experimental results confirmed the validity of the proposed design and analysis scheme of the high-speed BLDC motor and the results were validated by finite element method.
Abstract: This paper describes the design and analysis of a high-speed and high-power density BLDC motor for a 50-kW, 70 000-rpm class centrifugal compressor. Design criteria and power loss analysis of the high-speed machine structure are described by analytical method, and the results are validated by finite element method. And then, the prototype machine has been fabricated and tested. The experimental results confirmed the validity of the proposed design and analysis scheme of the high-speed BLDC motor
114 citations
TL;DR: In this article, an analytical solution to predict magnetic field distribution and to calculate parameters of permanent magnet synchronous motor equipped with surface-mounted magnet using an electromagnetic transfer relations theorem (TRT) in terms of 2-D model in polar co-ordinates system is presented.
Abstract: This paper presents an analytical solution to predict magnetic field distribution and to calculate parameters of permanent magnet (PM) synchronous motor equipped with surface-mounted magnet using an electromagnetic transfer relations theorem (TRT) in terms of 2-D model in polar co-ordinates system. The analytical results are validated by comparison with finite element (FE) analyses and experimental results
15 citations
26 Dec 2007
TL;DR: In this article, an electromagnetic analysis for torque ripple reduction between mechanical geometry and electric parameters was performed for a switched reluctance motor (SRM) drive and the results were verified by the finite element method and experiment results with dynamic simulation.
Abstract: Industrial interest in switched reluctance motor (SRM) drives has varied since 1850s. This has been primarily due to the emerging markets for simple design geometry and low cost in consumer and industrial products, such as home appliances, air conditioning, hand tools, fans, pump motor, etc. However, SRM has been plagued with the acoustic noise and vibration problem by input power of fixed section. Therefore, this paper offers electromagnetic analysis for torque ripple reduction between mechanical geometry and electric parameters. Also, in dynamic operating for uniform torque, the dynamic characteristics by the switching time and input current are presented. This means that the rotor pole arc and electric parameters have related to produce the active and negative torque. This analysis results are verified by the finite element method and experiment results with dynamic simulation.
13 citations
26 Dec 2007
TL;DR: Characteristics for the LSRM are analyzed using finite element analysis (FEA) to derive design factor from pole arc ratio of stator and mover, and calculated time constant using phase inductance and resistance.
Abstract: 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 phase inductance and resistance. Second, we decided design parameter from design factor using time constant. Finally, analyze characteristics for the LSRM using finite element analysis (FEA).
9 citations
TL;DR: Using transfer relations derived in terms of magnetic vector potential and a two-dimensional (2-d) cylindrical coordinate system, the authors in this paper derived analytical solutions for Magnetic vector potential due to permanent magnets (PMs) and stator winding currents.
Abstract: This paper deals with analytical prediction for electromagnetic characteristics of a tubular linear actuator with Halbach array using transfer relations, namely, Melcher's methodology. Using transfer relations derived in terms of magnetic vector potential and a two-dimensional (2-d) cylindrical coordinate system, this paper derives analytical solutions for magnetic vector potential due to permanent magnets (PMs) and stator winding currents. On the basis of these analytical solutions, this paper also achieves analytical solutions for the magnetic fields distribution produced by PMs, stator windings current and axial thrust. The analytical results are validated extensively by finite element (FE) analyses. In particular, test results such as thrust measurements are given to confirm the analysis. Finally, this paper estimates control parameters using analytical solutions and test results such as thrust, back-emf, inductance and resistance measurements.
8 citations
26 Dec 2007
TL;DR: In this article, the authors present an analytical solution to predict the magnetic field distribution and characteristics of a 2 kW high speed permanent magnet (PM) synchronous generator equipped with surface-mounted magnet.
Abstract: This paper present an analytical solution to predict the magnetic field distribution and characteristics of a 2 kW high speed permanent magnet (PM) synchronous generator equipped with surface-mounted magnet. To analyze the magnetic field distribution, electromagnetic transfer relations (TR) theorem is applied. And characteristics are obtained by solving the PM machine's equivalent circuit (EC) equation for variable resistive load and the operating speed. The analytical results are validated by comparison with nonlinear finite element analyses (FEA) and experimental results.
4 citations
26 Dec 2007
TL;DR: In this paper, the authors compared the dynamic behavior of a moving-coil linear oscillatory actuator (MCLOA) with and without a mechanical spring and found that the spring influence on the MCLOA's dynamic behavior was negligible.
Abstract: This paper deals with the comparison and dynamic behavior of a moving-coil linear oscillatory actuator (MCLOA) with/without a mechanical spring. On the basis of a dynamic simulation model, the dynamic characteristics such as a current and a stroke of the MCLOA without the spring are predicted for various values of frequency. And then, dynamic test results are given to confirm the dynamic simulations. Finally, this paper describes the influence of the spring on the dynamic behavior of the MCLOA from the dynamic experiments of the MCLOA with/without the spring.
3 citations
TL;DR: In this paper, a two-stage current transformer with switches and an electronic circuit was used to improve the linearity and reduce the errors of the transformer, and the error of the current ratio was less than 0.3% over a current range 200:1.
1 citations