Free Flywheel Energy Calculator
Calculate the rotational kinetic energy stored in a flywheel.
kg
mm
RPM
Stored Kinetic Energy
49,348 J
Moment of Inertia (solid disc)1.0000 kg-m^2
Energy in kWh0.01371 kWh
Stored Kinetic Energy vs Flywheel Mass (m)
Flywheel Rotational Energy
A flywheel stores kinetic energy in its rotating mass.
Formulas
I = 0.5 m R^2 (moment of inertia for a solid disc)
E = 0.5 I omega^2 (rotational kinetic energy)
where m is mass, R is outer radius, and omega = 2 pi N / 60 is angular velocity. The usable energy is the difference between energy at maximum and minimum operating speeds.
Example Calculation
A 50 kg solid disc flywheel, 200 mm radius, spinning at 3000 RPM.
- 01R = 0.2 m
- 02I = 0.5 x 50 x 0.04 = 1.0 kg-m^2
- 03omega = 2 x pi x 3000 / 60 = 314.16 rad/s
- 04E = 0.5 x 1.0 x 314.16^2 = 49,348 J = 49.3 kJ
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