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An electric motor-powered flywheel is common in practice. The output power of the electric motor is approximately equal to the output power of the flywheel. It can be calculated by {textstyle (V_{i})(V_{t})left({frac {sin(delta )}{X_{S}}}right)}{textstyle (V_{i})(V_{t})left({frac {sin(delta )}{X_{S}}}right)}, where {displaystyle V_{i}}V_{i} is the voltage of rotor winding, {displaystyle V_{t}}V_{t} is stator voltage, and {displaystyle delta }delta is the angle between two voltages. Increasing amounts of rotation energy can be stored in the flywheel until the rotor shatters. This happens when the hoop stress within the rotor exceeds the ultimate tensile strength of the rotor material. Tensile stress can be calculated by {displaystyle rho r^{2}omega ^{2}}{displaystyle rho r^{2}omega ^{2}}, where {displaystyle rho }rho is the density of the cylinder, {displaystyle r}r is the radius of the cylinder, and {displaystyle omega }omega is the angular velocity of the cylinder.