How Do You Calculate Energy Harvested from a Shaken Electromagnet Device?

[Chip41]

Hi all, i was wondering if you could help me calculate a few things to do with induction and electromagnets.

I wanted to look into energy harvesting or charging using electromagnets and wanted to know how to calculate the energy that is created from this product below

http://www.qfonic.com/images/products/shaketocharge/image01.jpg

It is not much more than a coil of wire, a magnet, a bridge rectifier, super capacitor and white LED. A small magnet attached to an on/off switch is used to turn on the light by activating an internal reed relay. Shaking the device forces a large magnet slug to slide back and forth inside the body of the device therefore charging the capacitor inside.

How would i work out exactly how much energy is being gathered from the shaking of this device (if that is a stupid question can you give me an example of a similar system with the WxHxB and no.of coils and size of magnet running through.. so i can get an understanding of how to calculate this.. much appraciated!)

Sorry if its a stupid question

 

[member 553083]

!To calculate the energy harvested from this device, you would need to know the size of the magnet slug, the number of coils, the frequency of the shaking motion, and the voltage of the capacitor. With these values, you can calculate the amount of energy that is generated each time the device is shaken. You can then multiply that value by the number of shakes per minute to get an estimate of the total energy being generated. Additionally, you can factor in any losses due to friction or resistance in the system to get a more accurate result.