Transfer-matrix analysis of linear induction machines with finite width and depth

The linear induction machine is considered as a stack of rectangular regions bounded by an impressed excitation. These regions may in general be moving or stationary secondary conductors and iron segments and airgaps. For performance analysis, the field quantities must be evaluated in each region. A wave-impedance approach has previously been successfully applied in cases where lateral edge effects are neglected. Its application greatly simplifies the tedious task of matching up boundary conditions. The paper outlines a wave-impedance approach that takes into account the finite width of the secondary. Consequently the effects of the closure of the induced currents as well as skin effect can be simultaneously studied. The generalised results are shown to give answers consistent with known formulas when in turn lateral and skin effect are neglected.