Over here we normaly use the Burkert 5404 with 24V coil.
But a lower voltage coil would be great.
I'm not an electrical guy, so, what is needed to make one?
A thin wall non magnetic tube that fits over the "plunjer" and a load of thin insulated copper wire....
But after that? Is it just a long single winding? How much and how thin is needed?
Is long and thick better than a thin and shorter wire? Total resistance can be the same, but how goes the magnetic force then?
It's a huge block of plastic, with a U shaped steel bracket holding the coil and reinforcing the plastic.
The coil does not have a core in itself, the stainless steel "tube" on top of the valve fits comfortable in the coil.
Tue Jul 28, 2015 11:35 am
Nick Experienced Roboteer
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As well as getting it working on 12V, will it improve performance if the valve opens a bit quicker? The 24V coil has a really low current rating so if you use thicker wire and that calculator, the current and the magnetic field strength can be increased, pulling the solenoid core into the coil faster. Since the coil is only energised for a short time, you can increase the current quite a bit without overheating it. _________________ Australian 2015 Featherweight champion
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Tue Jul 28, 2015 12:02 pm
Glen Experienced Roboteer
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quote:Originally posted by maddox:
It's a huge block of plastic, with a U shaped steel bracket holding the coil and reinforcing the plastic.
The coil does not have a core in itself, the stainless steel "tube" on top of the valve fits comfortable in the coil.
interesting, might have a go of winding a new one tonight then. 200 winds of 24g at 12v should do the trick. _________________ www.demon50s.com - Minimoto parts
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Tue Jul 28, 2015 12:32 pm
Valen Experienced Roboteer
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wind it with the thickest you can easily fit, limit it with a resistor, that way you can tune it more easily perhaps? _________________ Mechanical engineers build weapons, civil engineers build targets
Tue Jul 28, 2015 1:56 pm
Glen Experienced Roboteer
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Heres a shameful example wound with a powerdrill after work.
450 turns of 24g 0.5mm diam wire. 1.6-1.7 ohm resistance. Draws about 9 amps at 12v with some extremely sloppy winding lol.
Pulls closed at 5.5v holding it in a vertical position and 6v with the whole valve assembled with springs. Will test it under pressure tonight
Don't forget you could wind one to be the same wattage as the stock coil at a lower voltage. I just didn't have the patience to put 1000 turns + on it lol _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Wed Jul 29, 2015 4:55 pm
Glen Experienced Roboteer
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okay just tested him then, heated the bottle up to about 700psi - Valve fired between 11-12v, after the first shot it was happy to fire down to 10v. This one would be sweet off a 4s lipo _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Wed Jul 29, 2015 5:43 pm
Nick Experienced Roboteer
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Small and cheap, just what you need, _________________ Australian 2015 Featherweight champion
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Wed Jul 29, 2015 7:02 pm
miles&Jules Experienced Roboteer
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Cool... that homemade one looks amazing…. Do solenoids always suck inward like that? i bought one at the dump…but thought they popped out rather than in…so maybe it does work _________________ Miles Blow - Julie Pitts
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Thu Jul 30, 2015 10:27 am
Nick Experienced Roboteer
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Location: Sydney, NSW
Solenoids always pull the iron core into the coil - but if the core has a non-magnetic extension, that part can be pushed out the other side. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
Thu Jul 30, 2015 10:36 am
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