If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
Attatched to this thread there are the simulations of 5 stages of my new microcontroller-driven pistol.
The preliminary simulations done with the simple model (proiectile as dipole moving in a magnetic field) using the same simulation parameters shows good agreement when using custom B-H curve with interpolation with the FEMM results. The snubbing resistance was chosen ( 1 ohm) to limit the spike under the switch breakdown voltage (600V IGBT)
initial speed (injector) : 4.8 m/s projectile weight 3.6g
Stage 1 spd: 27,21 m/s Kin: 1,33J eff: 3,29% on-time: 1240us Stage 2 spd: 35,18 m/s Kin: 2,30J eff: 5,31% on-time: 520us Stage 3 spd: 42,64 m/s Kin: 3,27J eff: 5,54% on-time: 440us Stage 4 spd: 50,94 m/s Kin: 4,67J eff: 6,44% on-time: 380us Stage 5 spd: 59,12 m/s Kin: 6,29J eff: 6,38% on-time: 360us --------------------------------------------
-------------------------------------------- total spd: 59,12 m/s Kin: 6,29J eff: 5,1% energy used: 124J
Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
For the first used the simple model. The attachment contains FEMM simulation instead using a LUA script. Why arent you opening the simulations? they are simply text files, open them with notepad or if you are using linux, use emacs text editor
Registered Member #511
Joined: Sat Feb 10 2007, 11:36AM
Location: Somerset UK
Posts: 55
Hi Merovingian
I am interested in your new 5 stage design could you provide more details about how the coils are driven? In another thread you describe an arrangement with one IGBT for switching and five SCRs to select each coil in turn but I find it difficult to visualize without a circuit diagram. In particular is this a dump and quench topology or half bridge? Are you using one big capacitor bank or one bank per stage? Will timing be open loop or are you using feedback from optical gates.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Coilgun 5 stage automatic pistol stage simulations
