The magnetic field analysis based on the wavelet transform is performed. The Halbach array magnetic field analysis has been studied using many methods such as magnetic scalar potential, magnetic vector potential, Fourier analysis and Finite Element Methods. But these analyses cannot identify a transient oscillation at the beginning stage of levitation. Wavelet transform can be the candidate for analyzing the transient oscillatory response of an EDS Maglev system. The proposed scheme explains the under-damped dynamics that results from the cradle*s dynamic response to the irregular distribution of the magnetic field. It suggests this EDS Maglev system that responds to a vertical repulsive force could be subject to such instability at the beginning stage of a low levitation height. The proposed method can be useful in analyzing instability at the beginning stage of levitation height.

A controller for the EDS maglev system with the Halbach array magnet is designed for the beginning stage of levitation and after reaching the defined levitation height. To design a controller for the EDS system, two different stages are suggested. Before the object reach a stable position and after reached a stable position. A stable position can be entitled a nominal height. The former is the stage I and the latter is the stage II. At the stage I, to achieve a nominal height the robust controller is investigated. At the stage II, both translational and rotational motions are considered for the control design. To maintain the system stability damping control and LQR control is performed. The proposed method can be helpful to understand system dynamics and achieve system stability.

• Major: Electrical Engineering
• Educational Career:
  • B.S., Kyungwon University, Korea, 1996
  • M.S., Kyungwon University, Korea, 1998
• Committee in Charge:
  • Dr. Chan Ham
  • Dr. Michael G. Haralambous
  • Dr. Roger Johnson
  • Dr. Stephen Watson