3 ms·
They usually are, but if you've got a receiving coil then you can put in a lot more energy before you begin heating up the primary coil. This is because with t
by simcop2387 12y ago
They usually are, but if you've got a receiving coil then you can put in a lot more energy before you begin heating up the primary coil. This is because with the other coil there it'll take in energy that would otherwise be turned into heat in the primary coil if you weren't draining it off. This means that if you can detect the presence of the device (usually by a change in the resonant frequency of your own coil I think is how they do it) then you know that it's safer to dump more energy into since it won't all be turned into heat.
- jacquesm 12y agoNo, you simply measure the current drain into the coil and when it hits a value that you associate with a magnetic short-circuit you limit the current to something very low until the short-circuit goes away. That way nothing gets hot. http://pics.camarades.com/v/jacques/renewables/windmill/dscf0297.jpg.html http://pics.camarades.com/v/jacques/renewables/windmill/dscf... See those laminates at the edges? They're 'open' for that same reason, that way the magnetic field goes through the coils rather than that it heats up the steel and generates waste heat. (that's from a windmill I built, diameter is ~ 12").
- quietplatypus 12y agoCould you discriminate between receivers too, based on picking a particular resonant frequency for the whole system? Or is that how you have to do it to do it safely.
- simcop2387 12y agoYou end up with a resonant frequency simply because physics ends up dictating that there is one, and staying at it gives you the highest efficiency. That said it does mean that you can use it as a discrimination between devices/standards.