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Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Inductors store energy like capactors, so why wouldnt people use them instead of capactors for high energy discharges. Was planning to try just wondering what the differences would be
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
They are used. In ignition systems for cars, flyback transformers for CRTs, etc. Inductors and capacitors are "duals". What one does with voltage and current the other does with current and voltage. Inductors have an additional flexibility that capacitors don't have, the mutual inductance, allowing transformers.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I guess; 1) energy density with present technologies capacitors can store much more energy per unit volume than inductors 2) cost of metal required for a given energy storage 3) inductance, capacitors can release huge discharge currents, the current from an inductor is the same as the charging current just before discharge
A compulsator stores enormous amounts of inertial energy in a rotating mass and releases the energy rapidly via rotating magnets & coils, a kind of inductive storage.
Registered Member #2906
Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727
Its just not practical. Voltage can be stored without loss. Magnetic fields must be sustained by a circulating current which generates powerdisipation over ESR in the loop which is allways present. Voltage alone does never disipate power. Current does.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
That compulsaltor like interesting and along the lines im think I might have to heed.
Having continuous current throught it is a down side.
Done some back of the envolpe, a 12 volt 100 amphour battery as the same energy storage as 250 amp 138 Henery coil, which apart from being large could be doable.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Inductors can have a much higher energy density than capacitors, but nothing like the power. Look up Sandia's 1MV 1MA transmission line water dielectric capacitors. One reason the water was cooled and ultra-pure was to lower the leakage, so increase the storage time, which made it possible to charge them from slow storage inductors rather than the more expensive and bigger storage capacitors.
Registered Member #54278
Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
Inductors certainly are able to store much energy, E=(1/2)L(I^2) joules. Here is where I find the idea interesting: For a capacitor it would be difficult to 'get at' the internal electric field (where the energy is stored) but, since an inductor's energy resides in it's magnetic field WHICH is out in the open you have 'easy access'. Do you have any specific energy extracting technique in mind?
Registered Member #42796
Joined: Mon Jan 13 2014, 06:34PM
Location:
Posts: 195
to store energy for long time in an inductor you need zero resistance in the wires so as long as superconductors are expensive and far bigger than a capacitor it will not be used
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
Andy wrote ...
That compulsaltor like interesting and along the lines im think I might have to heed.
Having continuous current throught it is a down side.
Done some back of the envolpe, a 12 volt 100 amphour battery as the same energy storage as 250 amp 138 Henery coil, which apart from being large could be doable.
A coil that could take 250 Amp and be 138 Henries would be the size of a house: 138 Henry coils do exist, however they are only rated to milliamps, because they have so many turns, the wire size needs to be small.
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High energy discharge but not as you know it.
