Characteristics Improvements of a Brushless Linear Motor

In this paper, an approach based on theoretical calculations to improve the characteristics of a realised switched tubular linear stepping motor, in terms of losses and clutter is presented. Firstly, a Joule and iron losses study for a constant magneto motive force are considered allowing several solutions permitting to reduce these losses. Secondly, a synthetic study of the developed force and the electromagnetic induction is provided. The tendency to increase the motor force and to attenuate the induction saturation, in different regions of one module of the concerned motor, had leaded to many improvement possibilities. The finite element software simulations along with the test-error method are used to select the appropriate stepping motor geometry. By analysing the iron losses expressions, an appropriate solution that reduces significantly the losses. Finally, an optimum airgap obtained by both using the numerical simulations and considering threshold magnetic constraint has conducted to a related developed force.