General info overviewgoals schematics railgun prototype rail. Electromagnetic coil gunconstruction and basic simulation. The tube runs through a series of electromagnetic coils like solenoids. It used a fine silver wire that the would vaporize under the high current. Electromagnetic coil gun project nuts volts magazine battery bank wiring diagram project description sf 2630 grid tie solar panel wiring diagram also off battery bank. Energy sources suggestions about what can be used to power a coilgun. Second prototype is trying to avoid all the flaws, which were found on the first prototype and find a benefits of using multiple acceleration stages. The electromagnetic fea model of the capacitordriven inductance coil gun was constructed to be able to optimize the coils dimensions. The coils on the coil gun have to be wired based on the schematic shown above. I kept the voltage low 36v, although it does pack about 100a through the coil in 10ms and it will fire a small section of nail at a maximum of about 30 mph. There is a point where higher voltage will taper off the output energy of the gun through power disipated through heat. A coil gun is an electronic gun that fires a projectile by means of the magnetic field generated when a large pulse of current is run through a coil. He is the author or editor of over a dozen books on technology, diy, and geek culture. The driving circuit was implemented as a dynamic model for the simulation of current.
This should launch the projectile outside the coil. If it is muzzle energy then projectiles from this weapon deliver. The em15 coil gun is a handheld, battery powered 12 vdc rifle that is capable of launching a. An electromagnetic launcher eml is a device used to propel and accelerate a. Oystein pedersens coilgun original page is down now. The oldest electromagnetic gun came in the form of the coilgun, the first of which was. Coil construction issues high power coilguns experience large dynamic forces so the coils need to be constructed with inherent strength. Traditional nail guns use compressed air, explosive gases or charge, or an electric motor. Watch a homemade coilgun destroy a laptop popular science. Some simple ways to achieve a strong coil are discussed. I used a 50a rated stud type scr, 50ria120, smaller scrs like the tyn616 can also be used if 5 or 6.
The instantaneous vertical position should be calculated. Electromagnetic coil gun design and construction abstract a singlestage, sensor less, coil gun was designed to demonstrate the capability to accelerate a ferromagnetic projectile to high velocity. A coil gun is a device that uses a magnetic field to launch a ferromagnetic projectile. Particularly if they make a loud noise, explode, or launch something at high velocity. This paper summarize all important steps during coil gun design, such as physical laws of the coil gun, preliminary calculations, the. The armature of reluctancetype coilgun is ferromagnetic material. They use a current to charge copper wires and create an electromagnet to launch a projectile. There is also a chapter discussing velocity measurement of a projectile. The pulse time also relates to the length of the coil, a longer pulse time will be nessesary for a longer coil and a shorter pulse time will be necessary for a shorter coil.
In a ringshaped electromagnet with a small air gap, the magnetic field. Design and experiments of multistage coil gun system jve journals. The future of the navys electromagnetic railgun could be a. Electromagnetic coil gun project nuts volts magazine. It was about 3 meters long, consisting of 2 meters of accelerating coil and 1 meter of decelerating coil.
It was able to launch a glider or projectile about 500 meters. The oldest electromagnetic gun came in the form of the coilgun, the first of which was invented by norwegian scientist kristian birkeland at the university of kristiania today oslo. This was a nice seconday tesla coil size coil that an expendable component kinda like ammo. A coil gun is a device that fires magnetic projectiles at high velocities, using electricity. Efficient coil gun drive requires the coil to maintain current while the projectile is accelerating, and only cut the current when the projectile is in the coil. Optimization of reluctance accelerator efficiency by an improved. If the current persists after the projectile exits the coil it will act to decellerate the projectile, which does defeat the purpose of the whole thing. It accelerates a piece of iron or steel down a tube. To see some of our coils, click on the word photos below to find a coil to fit your existing needs. This somewhat larger singlestage coilgun will examine two key concepts. Ive always been interested in home made devices that do something useful. A coil gun, which is a type of eml, can propel a projectile without any.
A helical railgun was built at mit in 1980 and was powered by several banks of, for the time, large capacitors approximately 4 farads. This paper summarizes all important steps during coil gun. The information contained in this article is potentially dangerous. Jun 04, 2014 building something powerful and dangerous probably lies in the nature of a man. The invention was officially patented in 1904, although its development reportedly started as early as 1845. Electromagnetic coil gun final report capstone advisor rutgers. A coil gun is a type of rifle that uses an electromagnetic accelerator coil or a series of. They have imported accutech, citadel, excel, howa, and issc pistols. An electromagnetic coil gun is a type of weapon that uses an electromagnetic launch coil or a series of launch coils to accelerate a ferromagnetic projectile. This is a great project to explore a number of analog electronics concepts. Fabricated a lighter and shorter projectile, grams at 3.
Simplified diagram of a multistage coilgun with three coils, a barrel, and a ferromagnetic projectile. In this article, ill show you how to build a coil gun. This projectile does not yield the high joules i expected because the lc discharge pulse period, which is fine for the 7. The coil gun is designed for an exhibition centre as an exhibit. Learn how to make a simple but extremely effective coil gun using only a few parts that are fairly easy to obtain by only going to a few places and possibly online.
Electromagnetic coils are used in electrical engineering, in applications where electric currents interact with magnetic fields, in devices such as electric motors, generators, inductors, electromagnets, transformers, and sensor coils. Pdf a singlestage, sensorless, coil gun was designed to demonstrate the capability to accelerate a. Feature comparison the feature differences between magnetic weapons and standard firearms. An scr silicon controlled rectifier or thyristor is used to control the high voltage supplied to the coil, it acts like a switch. A singlestage, sensorless, coil gun was designed to demonstrate the capability to accelerate a ferromagnetic projectile to high velocity. Threestage coil gun final project report december 8, 2006 e155 dan pivonka and michael pugh abstract. An electromagnetic coil gun with three stages of accelerating coils is designed and built. The em15 coil gun schematic diagram is shown in figure 2. This article will describe the general construction of the electromagnetic coil gun shown in figure 1.
Be willing to spend more than a week on this and you might need a few heavy power tools only to make good projectiles. In contrast to an electric circuit through which electric charge flows, nothing actually flows in a magnetic circuit. The goal of this article is to help you design and build an electromagnetic coil gun. This paper summarizes all important steps during coil gun design, such as physical laws of the coil gun, preliminary calculations, the testing device and the final product. Electromagnetic coil gun construction and basic simulation 91 where v 0 is the initial speed, t is time and g is gravity acceleration. At this point, current through the loop is abruptly turned off so the projectile wont be slowed down by its continued attraction to the coil s magnetic field. C1 12,000 uf 200wvdc c2 15 uf 25wvdc d1 800v bridge rectifier d2 800v bridge rectifier l1 coil, 56 turns 12 awg p1 iron projectile r1 220 ohm 1 watt r2 25 ohm 25 watt r3 150k ohm 1 watt r4 62 milliohm 5 watt s1 momentary action dpdt centeroff switch s2 dpst power switch. Electromagnetic control in components and devices handbook. Feb 22, 2016 electro magnetic cannon, capacitor 4700uf160v, supply output 100v dc, coil made of dual 0.
To test the coil gun project simply put the metal piece inside the coil and press the button on the breadboard. Electromagnetic coil gun construction and basic simulation. These are the basic physics principles by which a coil gun operates, which appears to be what you are interested in. A coilgun, also known as a gauss rifle is a type of projectile accelerator consisting of one or. The highpower switch is a mechanical contactor of a novel design. After my move from brazil to study in the us i had to leave behind all of my ongoing projects, including the 3kj single stage coil gun and my 7kj multi stage coil gun prototype, both of which were incomplete the multi stage coil gun was crushing the glass coil forms i was using as barrels and the. Electric machine gun is silent electricity replaces gunpowder in a silent, smokeless, machine gun recently perfected for defense against hostile aircraft.
Shot from a singlestage coil, the kinetic output is a meager 8 joules. Diy, batterypowered coilgun destroys all toys wired. The rail gun was fired from a height of 25 inches with an angle of 110 inch 6 inches so 1 degree. Even or especially some mit professors are passionate about powerful technical devices such as chain saws and theres also some competition on the internet in the worlds coilgun arsenal, where devices from all over the world are sorted and several parameters can be compared with others. Magnetic circuit, closed path to which a magnetic field, represented as lines of magnetic flux, is confined. We put a barrier 24 ft away and it went over it, giving it a min speed of about 70 fts. Pdf electromagnetic coil gun construction and basic simulation. Apr 17, 2007 electric machine gun is silent nov, 1936 this is a pretty cool looking rail gun. Emf schematics w parts lists numrich numrich gun parts.
Coil guns require no explosive propellant, therefor can be fired an infinite amount of time, providing that there is ammunition and available electricity. The simplified edition is very cheap and easy to build and requires no explosive propellant. The driving circuit was implemented as dynamic model for simulation of current. The large copper contacts offers an esr equivalent series resistance much lower than silicon devices. In our coil gun, we store high levels of charge within capacitors we discharge it through a coil we build up the charge with a 36 volt source we control the circuit with a dpdt switch and scr. An electromagnetic coil is an electrical conductor such as a wire in the shape of a coil, spiral or helix. Transient response of rlc circuit with 35v, 3900uf capacitor.
I built my first one in only a week after i had all the parts. Sep 20, 2010 no, this is not one of the scifi video game replica weapon props i keep posting aboutits a real, functioning homemade coil gun by jason, aka youtube user larsplatoon, aka photobucket and user saz43, who has been working on it for two years. Electromagnetic coil gun elektromagnetic cannon youtube. Mathematics covers some of the math used in electromagnetics. The nail coil gun project attempts to fill a void in the nail gun market of coil gun based nail guns, while using the advantages of the coil gun to solve some problems associated with conventional nail guns. In this paper, an improved discharging circuit was proposed to quicken the. Includes the fundamental relation between flux and magnetomotive forces, the magnetic circuit with iron, hysteresis and eddy currents in iron, induced e. Coil guns may sound like futuristic weapons, but theyre actually something you can build at home. It is driven by an battery pack not mounted yet with 1012 discmansize limh rechargeable batteries. Anyway, ive always wanted to try to make a coilgun. However, we think it hit the wall at a height of 15 inches, giving it a speed of 140 fts. Rail gun and coil gun designs main overview goals intro railgun accelerator electronics misc. Gauss guns, also known as coil guns, derive their name from the mathematician gauss, whos name is a measure of magnetic field strength and since the propellant force in a gauss gun is a magnetic field, it makes sense to call them by the unit of that field. Electromagnetic launch technology provides a competitive.
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