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Design and Simulation of an Electromagnetic Aircraft Launch System (*) D Patterson, A Monti, C Brice, R Dougal, R Pettus (**)T Bertoncelli (*) Department of Electrical Engineering - University of South Carolina Swearingen Center – Columbia, SC 29208 USA Phone: +1 803 7777362; Fax: +1 803 777 8045 E-mail: patterson@ieee.org (**) Dipartimento di Elettrotecnica – Politecnico di Milano Piazza Leonardo Da Vinci, 32 – 20133 Milano – Italy Phone: +39 02 23993702; Fax: +39 02 23993703 E-mail: tiziana.bertoncelli@etec.polimi.it Abstract This paper describes the basic design, refinement and verification using finite element analysis (FEA), and operational simulation using the Virtual Test Bed (VTB), of a range of candidate linear machines for an electromagnetic aircraft launching system (EMALS) for the aircraft carrier of the future. Choices of basic machine format, and procedures for determining basic dimensions are presented. A detailed design is presented for a permanent magnet version, and a super conducting field coil and an induction machine version are introduced. The long armature – short field geometry is discussed, and in particular the impact of this geometry on the scale of the power electronic drive system is presented. 1 Introduction 1.1 The Project Modern ship designs are increasingly moving towards the use of electricity to distribute, control, and deliver energy for the multiplicity of on board needs. This trend has already resulted in large direct drive electric machines for traction in commercial shipping. In some significant cases, including traction, adoption in military applications is rather slower, because of the comparatively low achievable power, energy and torque, per unit volume and per unit mass, of electro-mechanical energy conversion systems. However the benefits of controllability, robustness, reliability, damage management, operational availability, reduced manning etc. are undeniable. Whilst all actuation systems are under continuous investigation, there is a high level of interest in determining the feasibility an electromagnetic aircraft launch system (EMALS) for the aircraft carriers of the future. Studies are being carried out at the University of South Carolina (USC) to investigate possible competing solutions and to determine their feasibility and comparative strengths. Simulation uses the Virtual Test Bed (VTB), a new environment for simulation and virtual prototyping of power electronic systems that includes not only simulation of system dynamics, but also solid modeling of the system and visualization of the system dynamics. To fully accommodate the breadth of disciplines that power electronics encompasses, the VTB provides several advanced capabilities, including ?? Multiformalism – the ability to express in different languages the models of the various components that make up a system, ?? A highly interactive environment – wherein users can change the system topology or parameters while a simulation executes, and