Optimized Design of a Novel Modular Tubular Transverse Flux Reluctance Machine

This paper presents a new type of tubular electrical machine with a modular construction. The structure of the machine, concerning its construction, is discussed in the first part of the paper. A semi-analytical method based on the magnetic equivalent circuit calculation is used in order to obtain the flux densities in different parts of the iron core of the machine. A Gauss elimination procedure is applied to the system of linear equations resulted from the magnetic equivalent circuit, in order to express the flux in the air gap. The problem of optimization of the traction force is analyzed. The maximization of the function is handled with the Nonlinear Conjugate Gradient method and verified with a Gauss Newton algorithm. An application of the presented theory shows the usefulness of this approach. The results provided by the optimization method applied on a designed tubular machine illustrate its advantages. A numerical analysis performed on both a designed and then optimized structure confirmed the results obtained in the optimization process.