  We discuss theoretically the properties of an electromechanical oscillating
system whose operation is based upon the cyclic conservative conversion between
gravitational potential, kinetic, and magnetic energies. The system consists of
a superconducting coil subjected to a constant external force and to magnetic
fields. The coil oscillates and has induced in it a rectified electrical
current whose magnitude may reach hundreds of Ampere. The design differs from
that of most conventional superconductor machines since the motion is linear
(and practically unnoticeable depending on frequency) rather than rotatory, and
it does not involve high speeds. Furthermore, there is no need for an external
electrical power source for the system to start out. We also show that the
losses for such a system can be made extremely small for certain operational
conditions, so that by reaching and keeping resonance the system main
application should be in the generation and storage of electromagnetic energy.
