Coilgun does not work with capacitor?

I have a coil of 8 layers of 50 loops, so 400 loops. which has a resistance of 0,91 ohm.
To power this I use 3 450V 220μF in series charged to about 1000V and when I connect my coil it gives a small spark and the Iron projectile doesn't move.
I know the coil works because when I connected it to my welding transformer of 70V It did work.
what am I doing wrong?

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iceng8 months ago

stefl5 should also be aware that EL capacitors are slow to discharge in a
coilgun despite C x V x V / 2 potential energy, which is why the
welding transformer worked....

steveastrouk8 months ago

Also be aware that capacitors rarely share voltage across them evenly, without biasing resistors.


Extremely topical.

A schematic would be nice.

Without a schematic we cant tell if there is resistors or even a diode on the transformer secondary.

I forgot to mention make sure the diode between the step up transformer and the capacitors is working.

Sounds like the capacitors are not charging to capacity, if they were fully charged you should get a big spark at 1000 volts.

Check your connections and make sure of the capacitors polarity you could have one connected in reverse.

Downunder35m8 months ago

Coilgun usually operate with power level above the 5kW range.
As Stevastrouk pointed out you only have enough energy available to give your projectile a slight tap.
Unless your projectile is the size of a sewing pin it simply can't overcome inertia.

steveastrouk8 months ago

You have 73uF of capacitance, holding only 36Joules.