Linear switched reluctance motor. A new design methodology based on performance evaluation

This paper concerns the design of linear switched reluctance machines (LSRM), by evaluating the traction forces under defined speed operation conditions. A new methodology concerning optimised design of LSRM, for urban systems of electric traction at low and medium speeds, is proposed. This methodology, supposed to be original, is based on the systematic use of a known and fast processing calculation process, in which some changes are made in order to turn it more generic. For each one of the several design machines the respective magnetization curves are calculated, based on the B=f(H) characteristic of the used material, as well as on the calculated machine dimensions. This calculation was made through the linearization of the airgap length mean value between the unaligned and aligned positions. The simulation of different machines permits the selection of proper model for specific requested application. Simultaneously, machine simulation allows to define the best control strategy for continuous operation. The developed software, for machine simulation, still allows to simulate any LSRM with known magnetization curve I=f(ψ,x).