Tubular linear induction motor for hydraulic capsule pipeline. II. Finite element method (FEM) maximum thrust design

For part I see ibid., vol. 8, no.2, pp. 251-256 (1993). The axisymmetric analysis of the magnetic field and the finite element method (FEM) formulation of the tubular linear induction motor (TLIM) for application to hydraulic capsule pipelines was discussed in part I. In these studies a three-phase sinusoidal current source supplies the stationary windings to produce a traveling magnetic field inducing currents in the cylindrical capsule conducting wall to produce thrust on the capsule. The results of the different studies using the developed FEM tool show that by introducing iron elements in the pipe wall, the thrust can be increased. Five cases are discussed here, and the magnetic field contours for each case are presented. FEM computation of the thrust for all cases is compared to choose the design which produces the maximum thrust