Flywheel energy storage (FES) system depends on high-speed flywheel
and stores kinetic energy. It has such merits in the field of energy storage
as high efficiency, long life and no environmental pollution. Before the 80抯,
the FES technology developed slowly because of many unsolvable
problems such as the driving of high-speed flywheel, the high-efficient
energy converting, the friction of flywheel bearing and the...