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Location: Luleå, Sweden
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Design of Solenoid - High Speed on Moving Axis

07/13/2010 2:41 AM

To whom it may concern!

I want to design a solenoid that creates a high speed on the moving axis.

Does anyone have good information on how to design a solenoid to optimise the force/speed of the punch?

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Guru
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#1

Re: Design of solenoid

07/13/2010 3:37 AM

There are lots of stuff on the web .. here are two good links to help you get started.

magnet-schultz

http://www.coilgun.info/about/home.htm

Since you want high speed, the coilgun websites maybe more interesting and useful

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#2

Re: Design of solenoid

07/13/2010 3:54 AM

coilgun.eclipse.co.uk

Another good site for the basics

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Guru
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#3

Re: Design of Solenoid - High Speed on Moving Axis

07/13/2010 9:35 AM

Handheld? Portable? Bench mounted? Truck mounted?

Pneumatic? Electric? Powder actuated?

You have not told us much. Maybe have a look at a captive bolt stun gun for ideas.

This is a powder actuated portable captive bolt gun used on animals.

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#4

Re: Design of Solenoid - High Speed on Moving Axis

07/13/2010 11:21 AM

Ahhh.. i assume the OP has asked for a 'solenoid' in the electrical forum, so my thinking is biased towards an electromagnet. Maybe there are other options as Doorman points out (reminded me of a book called 'Bolt' by Dick Francis. Thanks for the image Doorman)

Assuming that the OP still wants an electromagnetic solution, the Magnetschultz website has a document where the possibility of different force/stroke characteristics can be achieved .... the ascending characteristic III seems to suit the OP....

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#5
In reply to #4

Re: Design of Solenoid - High Speed on Moving Axis

07/13/2010 11:49 AM

Hello kvsridhar. It is good to meet you.

I suspect you may be correct about an electric solenoid. Pneumo or hydraulic cylinders with pistons are not really solenoids.

Buy when I consider the phrase "...a solenoid to optimise the force/speed of the punch?", I think he may be looking for a device that converts energy into linear motion, but not necessarily a solenoid.

As with many questions posted on CR4, we are just guessing what the real question is. We will probably have to wait for some input from OP.

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#8
In reply to #5

Re: Design of Solenoid - High Speed on Moving Axis

07/14/2010 10:52 AM

Nice to meet you too ... i have admired many posts of yours and increased my knowledge too. Like this one of the 'bolt'

The T-shirt used to be a bit of a distraction, now it is a welcome sight

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Guru
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#9
In reply to #8

Re: Design of Solenoid - High Speed on Moving Axis

07/14/2010 11:03 AM

"Nice to meet you too ... i have admired many posts of yours and increased my knowledge too. Like this one of the 'bolt'"

Thank you, kvsridhar. That is very kind of you to say.

Yes, the tee-shirt avatar is part of my tag line, Semper Ubi Sub Ubi. This is a remnant from latin class, which translates (VERY loosely, with tongue firmly planted in cheek) to "Always wear underwear". I am pleased you enjoy it!

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Guru
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#10
In reply to #9

Re: Design of Solenoid - High Speed on Moving Axis

07/14/2010 11:16 AM

Ahhh.. i have no latin background (other than 'cogito ergo ...er .. dubito ergo so i maybe sum???") so i was wondering, very nice, i hope you will permit me to use it appropriately in everyday life .

i think i managed to translate Tornado's tagline i think, the moral being "better drink wine or beer and be stupid rather than drink water and be full of sh*t " i guess. i am scrupulously following that advice until my doctor (the blighter) tells me "there is too little blood in your alcohol stream"

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#6
In reply to #4

Re: Design of Solenoid - High Speed on Moving Axis

07/13/2010 10:53 PM

I too recognize the Dick Francis reference - nice work for those of us who read for pleasure!

I'm thinking that he's looking for a kick start in the angular momentum area - that is to say an elecrtomaticaly anchored lug (I don't know of any other way to express it) struck by an em force. I don't see that happening. I have seen rachet collars employed in outfits like this, but shsaft wear becomes a problem.

Like many of the problems submitted here, we seem to be working without build and function parameters.

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#11
In reply to #6

Re: Design of Solenoid - High Speed on Moving Axis

07/14/2010 11:34 AM

You bet! Dick Francis is one of my favourites, as are Alistair Maclean, John Grisham, David Baldacci .. hundreds of outstanding authors. Also the new Indian authors like Chetan Bhagat, Arundhati Roy (a little heavy), Arvind Adiga... what is life without reading !

About the other part, do you mean a rotary solenoid ? i have seen one or two, did not have time to study them though... i am keen to learn some new things on these.

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#7

Re: Design of Solenoid - High Speed on Moving Axis

07/14/2010 2:58 AM

Hi,

a solenoid has some inductance, so to bring a current through it will require a very high voltage combined by a low inductance.

Only one turn of the coil and pulsed by a switched capacitor bank of low inductance capacitors would be best.

Pulsed-laser power supplies have these characteristics.

The problems are:

- insulating the solenoids wires against sparking,

- mechanically strengthening the copper turns in order to not tear to pieces the coil at any shot, (or straightening the "coil" by the axial forces if more than 1 turn),

- getting a switch that is reliable and fast - depending on how many shots your machine shall do.

I used such an arrangement for magnetising SmCo and FeNdB-magnets. These need 4 Tesla for some 20 ms to reach a good quality.

RHABE

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