Methods of rotational energy harvesting and storage

AI Thread Summary
Methods for harvesting rotational energy include using turbines to compress air, electric generators paired with batteries, torsional springs, and flywheels, although the latter requires significant mass for effective energy storage. The pulsed alternator is highlighted as an efficient device that accumulates rotational kinetic energy and converts it into high-current electrical pulses, particularly useful in applications like rail guns. The discussion seeks to identify additional methods and products for efficient energy harvesting and storage beyond electromagnetic generators. Efficiency remains a key concern in selecting the best method. Overall, exploring various technologies can enhance the effectiveness of rotational energy harvesting systems.
physea
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Hello!

What are the available methods to harvest rotational energy?
I was thinking to put a turbine on the shaft and compress air, but the air will get cold and the energy will be lost.
I was thinking to put an electric generator, which is ok but it needs a battery.
I was thinking to use torsional springs.
I was thinking to use a flywheel, but it must have quite large mass to store the energy.

Are there any other methods to harvest and store the rotational energy of a shaft?
Which would be the most efficient?
Are there any products/systems sold? (apart from the electromagnetic generator).

Thanks!
 
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There is a device called a pulsed alternator that is used to power rail guns. It allows the accumulation of rotational kinetic energy over an extended time period with a quick conversion to a high-current electrical pulse when the energy is dumped.
 

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