Title :
Analytical Solution for Rotor Eddy-Current Losses in a Slotless Permanent-Magnet Motor: The Case of Current Sheet Excitation
Author :
Markovic, Miroslav ; Perriard, Yves
Author_Institution :
Ecole Polytech. Federale de Lausanne, Lausanne
fDate :
3/1/2008 12:00:00 AM
Abstract :
We present an analytical solution for the magnetic field, induced eddy currents, and the corresponding losses generated in the rotor of a slotless permanent-magnet (PM) motor. The field excitation is a current sheet placed at the stator interior surface. The solution is based on an analytical solution of the diffusion equation using double Fourier series and in the complex domain. The first and the second Fourier series correspond to the time and space harmonics, respectively. We have analyzed the effect of each time harmonic in detail, and verified the results with FEM software.
Keywords :
Fourier series; eddy current losses; finite element analysis; harmonics; permanent magnet motors; rotors; stators; FEM software; diffusion equation; double Fourier series; field excitation; finite-element method; rotor; rotor eddy-current losses; slotless permanent-magnet motor; space harmonics; stator interior surface; time harmonics; Eddy currents; modulation; permanent magnet;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2007.914620
