Armature reaction field and inductance calculations for a permanent magnet linear synchronous machine based on subdomain model

摘要

This paper proposes an analytical technique to calculate the armature reaction field and inductance of permanent magnet linear synchronous machines (PMLSMs) based on a subdomain analytical model. The analytical expressions can be used for PMLSMs with any armature current waveform and any number of slots. The analytical solutions based on the subdomain model, in terms of a two-dimensional Cartesian coordinate system, are obtained using boundary conditions. The analytical results of the magnetic field are validated extensively with finite-element (FE) analyses. Based on these solutions, the inductance is also determined analytically. Finally, the predictions are compared with the three-dimensional FE analyses and the measured data to confirm the validity of the analysis methods presented in this paper.