UNINTERRUPTIBLE POWER SUPPLY USING A HIGH SPEED CYLINDER FLYWHEEL
摘要
An uninterruptible power supply flywheel (120) includes a solid steel cylindrical flywheel (121) levitated for rotation about a vertical axis at tip speeds greater than 250 m/s on magnetic bearings (124, 125) in a low pressure housing (123). The flywheel inertia section operates with a maximum stress of greater than 60% and less than 80% of the material yield stress when spinning at fully charged operating speed. The flywheel is constructed from steel with an ultimate strength greater than 150 ksi and a toughness greater than 100ksi (in) &cir& 1/2. The flywheel is a solid steel cylinder that is hardened to centerline structure throughout the axial thickness of the large diameter portion that is greater than 40 % martensite. The flywheel is a solid steel cylinder that, in normal, fully charged operation, spins at a speed that would cause a fracture failure no sooner than one hundred thousand cycles between the fully charged normal operating speed and 10% of that normal operating speed. The flywheel is free of flaws with length greater than 1/8th inch at a diameter less than 20% of the outer diameter of the flywheel.
申请公布号
WO0203523(A2)
申请公布日期
2002.01.10
申请号
WO2001US20026
申请日期
2001.06.21
申请人
INDIGO ENERGY, INC.;GABRYS, CHRISTOPHER, W.;CAMPBELL, DAVID, R.