Equivalent Network modelling of an Axial Flux Air-Core Compulsator

The analysis of electromagnetic launchers requires the solution of strongly coupled electrical and mechanical equations since the high speeds involved cause a fast electromechanical transient. Electromagnetic launchers need extremely high currents characterized by impulsive behavior to be effectively fed. In this framework, air-core compensated pulsed alternators could be a promising choice [1]. Further improvements could be achieved considering an axial flux air-core compensated pulsed alternator. Although some examples are present in the literature [2-3], their potential has not yet been extensively studied. In general, compared to radial flux devices, axial flux ones show high torque/power density and smaller axial length, reaching the requested performances with a compact and light device. However, their design inherently requires full3D electromagnetic simulations, and consequently, their analysis is associated with intensive computational burden. Most of the studies about air-core compensated pulsed alternators are based on the standard mathematical approach used in electrical rotating devices. However, these formulations cannot take into account all the physical aspects involved and need extensive simplifications. Moreover, given the inherent time-varying nature of the launchers and compulsators, identifying the parameters for the lumped equivalent circuit of these devices can be challenging. In this contribution, the feasibility of an axial flux air-core pulsed alternator will be investigated. In particular, the numerical analysis of the device will be performed using a research numerical code based on an integral formulation.