Comparison between self-excitation and pulse-excitation in air-core pulsed alternator system

摘要

Air-core pulsed alternators greatly enhance the power density capabilities of pulsed power supply for electromagnetic launchers. Compared with iron-core electric machines, they require very high excitation currents. Usually, the self-excitation mode is adopted in these systems. However, the self-excitation mode is a positive feedback process which should be precisely controlled to avoid the system being destroyed. The excitation losses are very large during the process of establishing the large field current.