Electromagnetically levitated flywheel energy storage system with very low internal impedance

This paper describes an original concept of electromagnetically levitated flywheel energy storage capable of very fast discharges and, consequently, unusually high pulsed power in rapid pulses, with short rise time. The anisotropy and nonuniformity of the compensation winding allows not only for the very low internal impedance, but also for the reduction of losses during the electrical discharge by a partial decoupling from excitation. A discussion of force management, excitation management and related effects recommends the use of ferromagnetic structures, for both drum and disk topologies, in order to achieve the desired performance.