Author: "Tae Heoung Kim" / Topic: electromagnetic induction - Searchworks@Jio Institute Digital Library Search Results

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Start Over Author "Tae Heoung Kim" Topic electromagnetic induction

Author: Sung Hong Won, Tae Heoung Kim, Ki-Bong Jang, and Ju Lee
Subjects: Electric motor, Inductance, Magnetic circuit, Materials science, Electromagnetic coil, Equivalent circuit, Torque, Mechanics, Electrical and Electronic Engineering, DC motor, Electronic, Optical and Magnetic Materials, Electromagnetic induction
Abstract: This paper proposes the single-phase flux-reversal motor for a vacuum cleaner. The circuit parameters are determined by using both finite-element method and experimental measurements while a simulation was done by using an equivalent circuit model to derive the dynamic characteristics. Due to the inductance of the coil of high-speed drives, a phase difference occurs between the current and the electromotive force which produces a negative torque that degrades the output. Through simulation, the turn-on angle and turn-off angle that minimize the negative torque are found and simulation results will be compared with the results of the experiment.
Published: 2005

Author: Tae Heoung Kim
Subjects: *MAGNETIC flux, *MAGNETIC fields, *ELECTROMAGNETIC induction, *MAGNETISM, *FINITE element method, *ADIABATIC demagnetization
Abstract: Flux-reversal machine (FRM) is a new doubly salient stator-permanent magnet (PM) machine with flux linkage reversal in the stator concentrated windings. It can operate in both motoring and generating modes. Its simple structure makes it cost effective and suitable for mass production. However, there is notable permanent magnet flux leakage which deteriorates the torque ability of the FRM. In this paper, a novel design to improve the performance of an FRM is proposed. The proposed FRM has permanent magnets parallel to the stator magnet flux lines and thus is much more difficult to demagnetize. To analyze the characteristics of the proposed FRM, a two-dimensional finite-element method (2-D FEM) is used. The prototype FRM is also built to prove the advantage of the new design method. From the analysis and experimental results, it is shown that the proposed FRM has an improved performance. [ABSTRACT FROM AUTHOR]
Published: 2009
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Author: Ki Bong Jang, Tae Heoung Kim, Yon-Do Chun, and Ju Lee
Subjects: *MAGNETIC fields, *FINITE element method, *ELECTRIC circuits, *AUTOMATIC control systems, *ELECTRIC lines, *ELECTROMAGNETIC induction
Abstract: A novel permanent-magnet flux-concentration-type linear oscillatory actuator (LOA) for a compressor is analyzed in this paper. The losses of a flux-concentration-type LOA which is driven by sinusoidal and rectangular-shaped current are compared using finite-element method (FEM). In this computation, the equation of magnetic field is coupled with the equation of the driving electric circuit and the equation of motion. The results are compared with respect to iron losses. The eddy-current loss and hysteresis loss of both the sinusoidal current and rectangular current was calculated using two-dimensional FEM. [ABSTRACT FROM AUTHOR]
Published: 2005
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Author: Tae Heoung Kim, Sung Hong Won, Ki Bong, and Ju Lee
Subjects: *MAGNETIC flux, *ROTATIONAL motion (Rigid dynamics), *TORQUE, *ELECTROMAGNETIC induction, *DENTISTRY, *SIMULATION methods & models
Abstract: The cogging torque of the flux-reversal machine (FRM) may cause some problems like noise and vibration of the motor. By FEM analysis of the cogging torque of FRM, a noticeable feature was found that the rotor teeth width increases, phase and magnitude of the cogging torque varies. So, the rotor teeth pairing method is proposed for reducing the cogging torque of FRM. In this method, we made a rotor which has two different tooth widths and measured the cogging torque of the motor. From the result, we can see that the simulation result is well matched with the measured result and the proposed method is feasible. [ABSTRACT FROM AUTHOR]
Published: 2005
Full Text: View/download PDF

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