Analytical Modeling of Flat and Tubular Linear PM Machines with Surface-Mounted Magnets and Semi-Closed Slots

Abstract

An exact 2D analytical model for predicting the magnetic field in idealized structures of flat and tubular linear permanent magnet machines with surface-mounted magnets and semi-closed slots is described. The open-circuit and armature reaction magnetic field distributions are analytically derived and compared to those obtianed by finite elements analyses. The analytical model is then used for studying the effect of the slot-opening dimensions on the performance of linear machines. The developed analytical model can be advantageously used for the analysis and design of a class of linear machines.