The main purpose is to smooth out the power delivered from a motor to a given machine.
In that sense, the inertia of the flywheel opposes and moderates fluctuations in the speed of the engine and stores the excess in kinetic energy for intermittent use.
The purpose of a flywheel in a mechanical system is to store rotational energy and provide rotational inertia. It is a mechanical device that consists of a heavy wheel or disk mounted on an axle. The flywheel's main function is to maintain the rotational speed or angular momentum of the system.
The purpose of a flywheel in a mechanical system is to store rotational energy, smooth out fluctuations in rotational speed, and provide inertia to maintain a steady output during periods of varying input. It acts as a mechanical energy reservoir, enhancing the system's stability and efficiency. Flywheels are commonly used in engines, machinery, and energy storage systems.