Hello,
let's say I want to light a led (steady, not flashing) of some hundred mW. I'd like to use a magnetic energy harvesting method, for example the classical strong magnet into a coil (suggestion about other e. harvesting method are welcome; no thermal or solar, though).
Given the following condition (estimated) for the magnet movements:
frequency of oscillation: 1 Hz acceleration: 1 m/s^2 max velocity: 1 m/s
I want to estimate the dimension of the magnet and of the coil to produce the needed energy. I bet they will quite large... but I need just an order of magnitude.
Here another way to see the problem. Given the coil:
length: 50 mm internal diameter: 10 mm # of turns: 300 wire diameter: 0,1 mm
and given the magnet:
material: neodymium shape: cylinder diameter: 10 mm length: 10 mm
and given the information above about its movements, how much energy the system could provide? I'm interested to a rough value: 10 uW, 100 uW, 1 mW, 10 mW etc...
Thanks in advance for any answer Marco