Optimum Iron Pole Design of a Tubular Linear Synchronous Machine With Double-Sided Axially Magnetized Permanent Magnets Considering Leakage Flux

In this paper, the design optimization of tubular linear synchronous machines (TLSMs) was achieved by minimizing the mass of the iron pole, subject to satisfying the other performance specifications. Furthermore, to optimize the design of TLSMs with axially magnetized permanent magnets, an optimum design of the magnetic circuit of the machine with a reduced mass of ferromagnetic material was proposed while considering leakage flux. The leakage flux density at the iron pole on the surface of each side is an important consideration when choosing a suitable thickness ratio for the iron poles. The machine was optimized by maintaining a constant level of the back electromotive force, and considering the leakage magnetic flux at the iron pole. Finally, the total mass of the flux passing the iron pole of the optimized design is $\sim 39.31$ % of that in the conventional model.