A 500-Wh Power Flywheel on Permanent Magnet Bearings

A 500-Wh disk-and-shaft power flywheel test prototype for possible application in uninterruptible power supply (UPS) systems is described. The system was set up in order to evaluate the stability of a passive radial permanent-magnet bearing system under static and dynamic power load of the integrated motor generator. Preliminary tests have been run under up to 15-kW transient discharge power load with no significant effect on the bearing stability.