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Flywheel
Flywheel energy storage
There have been a number of experiments using flywheel energy storage in
electric vehicles. The flywheels store energy as rotation, which is converted to
electricity via a generator, which then drives the wheel motors. It might seem
odd to convert rotational energy to electrical energy, only to convert it back
again to rotate the vehicle's drive wheels, but in fact it is a necessary step:
in order to hold a useful amount of energy, flywheels need to spin extremely
fast, and an electric generator is usually a more practical converter for this
high speed rotational energy than a mechanical gearing system would be.
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