Flywheel Inertia Data: composite_rotor
Flywheel inertia and energy storage reference data for speed regulation and press design — solid disc, rimmed, spoked, and composite rotor configurations across cast iron, steel, aluminum, and carbon fiber composite materials; covers small (5–12 in OD), medium (12–36 in OD), and large (36–72 in OD) size ranges
| flywheel type | flywheel id | allowable stress psi (psi) | coefficient of fluctuation typical | density lb in3 (lb/in3) | energy stored ft lb at 1000rpm (ft_lbf) | inner diameter in (in) | mass lb (lb) | material | max rim speed ft per s (ft/s) | moment of inertia lb ft2 (lb_ft2) | notes | outer diameter in (in) | typical applications | width in (in) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| composite_rotor | composite_rotor_alum_12 | 60,000 | 0.03 | 0.098 | 406.9 | 4 | 19.5 | aluminum | 130 | 0.753 | 7075-T6 aluminum composite rotor; allowable 60000 psi (0.75*Fty for 7075-T6 Fty=80 ksi per MMPDS); rho=0.101 lb/in3 nominal; lighter than steel for same OD | 12 | cost-effective FESS; automotive flywheel; moderate energy density | 4 |
| composite_rotor | composite_rotor_alum_18 | 60,000 | 0.03 | 0.098 | 2,507 | 6 | 47.5 | aluminum | 130 | 4.638 | 7075-T6 Al rotor; OD 18 in; aluminum composite rotors used where weight saving offsets cost vs steel | 18 | medium FESS; wind power energy storage; weight-critical drives | 5 |
| composite_rotor | composite_rotor_cf_12 | 150,000 | 0.03 | 0.056 | 110.1 | 6 | 4.76 | carbon_fiber_composite | 500 | 0.204 | T700 CFRP rotor; rho~0.056 lb/in3 (1550 kg/m3); filament wound; vacuum-encapsulated; magnetic bearings; specific energy ~20-50 Wh/kg; sigma_allow=150000 psi (filament wind hoop). Conservative; see notes. | 12 | flywheel energy storage systems; UPS; grid regulation; automotive KERS | 4 |
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