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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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The characteristics of a projectile made of permalloy

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guitardude012
Wed Sept 24 2008, 03:39AM
guitardude012 Registered Member #968 Joined: Fri Aug 24 2007, 04:54PM
Location: Norman, Oklahoma
Posts: 104
nicora wrote ...

>WaveRider
I have not ever read what you said.
What is the source of the information?

Most of this, with the exception of saturation flux density values, are covered in the coil gun wiki page: Link2


For information on saturation flux density of steel check out: Link2
with some of our key words highlighted

Note that the second reference points out Saturation flux density won't exceed 3T except under "the most abnormal conditions".
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nicora
Wed Sept 24 2008, 07:48PM
nicora Registered Member #1681 Joined: Fri Sept 05 2008, 07:39PM
Location: Tokyo, Japan
Posts: 16
 		>rp181
Please tell me the efficiency of your coil-gun which uses a projectile made of hymu-80.
My coil-gun's efficiency is about 2% and it uses a projectile made of neodymium magnet (N40).
By the way, I obtained a rod made of permalloy.
So I will try to do experiment by using this material.

>quitardude012
Thanks.
It is very informative.
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rp181
Thu Sept 25 2008, 12:48AM
rp181 Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
 		I still need to get the capacitors for my coilgun, shouldnt be to long. I have everything else ready, including chrono. How much did the permalloy cost?
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nicora
Thu Sept 25 2008, 05:29AM
nicora Registered Member #1681 Joined: Fri Sept 05 2008, 07:39PM
Location: Tokyo, Japan
Posts: 16
 		>rp181
It costs about $70(diameter: 8mm length:1000mm).
I bought it in Japan.
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rp181
Thu Sept 25 2008, 12:02PM
rp181 Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
 		wow, do you know the value of hymu-80? i cant find anything on it.
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nicora
Thu Sept 25 2008, 12:19PM
nicora Registered Member #1681 Joined: Fri Sept 05 2008, 07:39PM
Location: Tokyo, Japan
Posts: 16
 		>rp181
I don't know.
I have done the experiment and the result was obtained.

There is no significant effect if I use 45%-Ni permalloy instead of iron as a projectile.
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WaveRider
Thu Sept 25 2008, 07:10PM
WaveRider Registered Member #29 Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
 		Hi nicora,
You can try the experiment. I used a ferrite rod (permeability approx 1000) and mild steel (permeabililty approx 2000...same order of magnitude). However the ferrite had a saturation flux density of about 0.35T and the milt steel, about 2T. Attempts to maximise armature exit velocity produced a paltry 9m/s for the ferrite, but the steel achieved about 20m/s in a single stage coilgun.

There is a physical reason for this, which I touch on here (see Fig. 3; the pressure vs. flux density)
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nicora
Mon Sept 29 2008, 06:55PM
nicora Registered Member #1681 Joined: Fri Sept 05 2008, 07:39PM
Location: Tokyo, Japan
Posts: 16
 		>WaveRider
Thank you.
I've read the discourse.
I was surprised that Mild steel was good material for a projectile.

Now, I intend to do experiment to measure the effect of the Si-steel shield attached to main acceleration coil.
Could you give me some ideas?
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rp181
Mon Sept 29 2008, 11:03PM
rp181 Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
 		what about steel projectile (or alloy) with a core of ferritre.
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