An approach to optimal design of double-sided coreless linear motor

Abstract

Double-sided coreless linear motors have a crucial role in direct-driven precise linear motion applications. In this study, an optimum design effort focused on thrust force production is presented. For an applicable brushless linear motor structure, winding and permanent magnet (PM) dimensions which are providing the highest possible force are defined by using finite element analysis (FEA). It is shown that the most important problem of an optimum design is arising from placing proper amount of ampere-turns, i.e. windings, without losing a substantial value of permanent magnet flux density due to increased air gap. For obtaining an optimal design, structural demagnetization, loading demagnetization and fringing flux must be taken into account. So a trade-off is provided between the winding structure and the PM assembly.