Characterization of a new linear switched reluctance actuator

This paper presents the electromagnetic analysis of a new designed and constructed prototype of a single-sided linear switched reluctance actuator. First, a brief consideration on the adopted analytical design methodology, establishing some desired electrical and mechanical parameters, is stated. After, a characterization of the actuator is made, analyzing the distribution of magnetic fields and connected translation forces, through the determination of energy and co-energy variation, performing a numerical analysis based on Finite Element Method. A saturation factor is then introduced, corresponding to the magnetic circuit saturation level, allowing the knowledge of the actuator thrust development performance, as well as the definition of proper relative positions for coils excitation, and respective current intensities, in specific practical motion applications. The influence of saturation factor in the actuator mechanical force development, for different positions and excitations, is established and connected with thermal, electrical and mechanical constraints. The paper is illustrated with experimental tests carried out by the authors.