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This paper is an investigation in the performance of two types of magnetic screws (MSs). The first is the magnet to magnet and consists of permanent magnet (PM) nut and PM screw and the second is a magnet to reluctance and consists of PM nut and a double-start reluctance screw. It is argued that for cost sensitive and long stoke applications, a magnet-to-reluctance MS may be the preferred option. It is also shown that capacitor discharge magnetization techniques can be employed for imprinting helical magnetization distributions on cylindrical PMs, significantly reducing the complexity and facilitating the practical realization of MS systems. [ABSTRACT FROM AUTHOR]

This paper discusses a study made for good asymmetric three-stage electromagnetic coilgun launching medium-weight projectile. Different lengths, number of turns, and switching times are chosen for each individual coil to get better results. Two detailed investigated models have been presented, including the effect of the switching time. Medium-caliber projectile of \text weight = 0.5 kg is employed in this paper. The results confirm that the second model asymmetric coilgun has 16.96% higher output speed, 63.92% lower length, and 57.5% lower launching time than the first model asymmetric coilgun. The obtained results have been recorded using the transient time electromagnetic simulations. [ABSTRACT FROM PUBLISHER]