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Hi, I am fascinated by coilguns and have already built a working one (though it hardly had the energy to exit the barrel :<). I was reading this (http://www.coilgun.eclipse.co.uk/energy_sources.html) page on energy sources and i was intrigued by the last section on inductors:
Inductor -
An inductive storage system consists of two windings on a closed magnetic circuit - basically a transformer. The primary winding forms the 'charging' side and the secondary winding delivers the output. This is a much more bulky system compared to the capacitor bank. As well as this drawback, there is the need to supply current continually in order to keep the inductor 'charged'. On the up side, the windings can be configured to produce any desired output voltage and current combination (within the capabilities of the device). The output can also be controlled by the collapsing the primary winding current in a controlled manner. Inductor storage systems can be built using superconducting technology which removes the need to continually supply current to keep it 'charged' however it introduces a host of other problems.
Do any of you know about inductive storage? What are the limits (could it achieve several hundred volts from a wall adapter)? Are these difficult to construct?
If anyone could share some information (love) it would be fantastic. Cheers, Jack Allison
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Without the use of superconductors, no inductive charge based system will be able to hold its charge for more than a second, the resistance of copper is just too large for it to work efficiently. With superconductors it works quite well, for example a typical MRI machine with superconducting magnets can store ~1MJ of energy in its magnet.
They can be used for applications where you do not need to store the energy very long (such as with pulsed power type systems) however capacitors are almost always a better choice.
Registered Member #3411
Joined: Sat Nov 13 2010, 08:25PM
Location:
Posts: 33
... wrote ...
They can be used for applications where you do not need to store the energy very long (such as with pulsed power type systems) however capacitors are almost always a better choice.
Im not so sure, inductors have much much higher energy densities. There are quite a few railguns powered by inductors on the internet, a relatively small inductor can dump extremely high currents. I do believe matching the inductor to the load is a huge issue tho. Railguns are obviously low-impedance devices, so its not a biggy. Coilguns are a whole other story and with those, an inductor is going to be really suboptimal.
The charging / dumping switches of an inductor-based power supply are also a bit more complicated.
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inductive energy source?
