Energy harvesting
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From: Marco Trapanese on 6 Mar 2010 05:38 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
From: D Yuniskis on 6 Mar 2010 12:54 Marco Trapanese wrote: > 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... google "shake light" The problem you will have is you *still* need storage of some sort (lest the light blink).
From: Marco Trapanese on 7 Mar 2010 07:54 Il 06/03/2010 18.54, D Yuniskis ha scritto: > The problem you will have is you *still* need storage > of some sort (lest the light blink). Yes, that's true. A supercap for example. But at the end the energy provided must be enough to power the load even with the storage unit. Otherwise the led will turn off after some time. Marco
From: D Yuniskis on 7 Mar 2010 13:58 Marco Trapanese wrote: > Il 06/03/2010 18.54, D Yuniskis ha scritto: > >> The problem you will have is you *still* need storage >> of some sort (lest the light blink). > > > Yes, that's true. A supercap for example. New devices use a small Li cell. And, when *that* dies (refuses to accept charge) you throw the thing away! > But at the end the energy provided must be enough to power the load even > with the storage unit. Otherwise the led will turn off after some time. > > Marco >
From: Marco Trapanese on 8 Mar 2010 09:23
Il 07/03/2010 19.58, D Yuniskis ha scritto: > New devices use a small Li cell. And, when *that* dies > (refuses to accept charge) you throw the thing away! So, what's the advantage of the Li cell instead of the supercap? >> But at the end the energy provided must be enough to power the load >> even with the storage unit. Otherwise the led will turn off after some >> time. Any rough values for sizes of magnet and coil to obtain some hundreds mW? Just to know how big should be the "torch". Thanks! Marco |