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Coilgun does not work with capacitor? Answered

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?

Discussions

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iceng

1 year 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....

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steveastrouk

1 year ago

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

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Josehf Murchisonsteveastrouk

Answer 1 year ago

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.

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Josehf Murchison

1 year ago

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.

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Downunder35m

1 year 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.

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steveastrouk

1 year ago

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