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Thursday, October 22, 2020

# Coil gun design

Want to know more about magnetism in coilguns? Want to know why and how electromagnets work? Want some math to help analyze coilguns? For background, here are some relevent coilgun topics on "the theory of electromagnets". Capacitors What are capacitors? What are the units of capacitance? How do they insulate plates? How does a capacitor discharge? Can multiple capacitors store more energy? How much kinetic energy from a capacitor?

Inductors What are inductors? What is inductive kickback? Is coilgun inductance important? How to measure inductance Equations for a damped oscillator Undamped vs critically damped. Projectiles What kind of magnetic materials are there? Consider the magnetic field and how it interacts with the projectile Force - where does it come from? Overview of electromagnetic guns. Winding Coils What if each coil has a larger number of turns?

Choice of magnet wire What coil size works best? What wire size works best? Coil With Projectile Physics of solenoids Magnetic field of a single wire loop What happens in very strong fields? What if you have a coil surrounded by iron? How much improvement do you get? What are salient pole motors? Multiple Coils Open-loop versus closed-loop control Variable coil length What if you use a larger number of coils? Building the ballistic pendulum Setting up the pendulum Determining muzzle velocity Physics of pendulums Tips and troubleshooting Benjamin Robins, inventor of the ballistic pendulum.

Other Phototransistor spectrum Want more? Here are some good books to read!Read the slides for Magnetic Launches - Hands-on Ideas 10my presentation about coilguns on May 22, As of this website supports SSL.

Let me know if you spot anything broken or just plain strange. Current projects : Click here to see my latest coilgun, my best coilgun or my levitator. What is a coilgun or gauss gun? It accelerates a piece of iron or steel down a tube. The tube runs through a series of electromagnetic coils like solenoids. There are no sparks or noise or impressive side effects or parts to wear out. Some careful timing circuits energize each coil in sequence. The principle of magnetic attraction draws the projectile along at rapidly increasing speed.

Why build a coilgun? It demonstrates many basic concepts of magnetic machines. A coilgun is foremost an example of a solenoid. These appear practically everywhere, from car door locks to doorbells, from diskette drive ejectors to fuel injectors. The only difference is that most solenoids limit the range of travel, and usually have a spring return. A coilgun is scalable to very large applications, possibly as large as a mass driver to put payloads into orbit. It's a keen space-age toy.

It has no moving parts -- there's the magic of invisible forces at work. It requires no special construction techniques or unusual tools.

Winding coils is fun and relaxing at least for the first few! Even small coils are remarkably powerful. You can also learn about magnetic levitation here. These pages include complete design details for several maglev demonstrators which levitate small iron parts. Read all about it and see levitation pictures. May 22, - Added the Overview page for a quick introduction to how it started, what happened and where it's going.

Check out the notes on each slide; very entertaining.

About This Site Topics: About. This website is my engineering notebook. This is a quick way to see how and why it started, what happened, and where it's going. Download my presentation here.You seem to have CSS turned off.

Please don't fill out this field. Coil Gun: Coil gun is an instrument that uses electricity to fire magnetic projectiles at a greater velocity. It requires no volatile propellant and can easily be fired at any unlimited time, providing that there is a quantity of bullets.

When coil gun is fired the coil of the wire induces magnetic field that produce ferromagnetic projectile into the cask. As soon as projectile reaches the coil magnetic field kept off allowing the projectile to continue down the cask at high velocities. Coil gun Design Web Site. Please provide the ad click URL, if possible:. Help Create Join Login. Operations Management. IT Management. Project Management. Services Business VoIP. Resources Blog Articles Deals. Menu Help Create Join Login.

Home Browse Coil gun Design. Coil gun Design Design and implementation of Coil gun Brought to you by: aliraza Add a Review. Browse Code Get Updates. Get project updates, sponsored content from our select partners, and more.

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Oh no!This is a relatively simple coilgun me and my grandpa made this summer. I will show you how to make a similar one. Please add a comment if you need extra help with anything. Also, add a comment if I need to change any of the steps. Please rate and comment, andplease help me if i'm not clear on something.

It takes about to minutes to charge. Have fun!

Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. Wind the coil as well as you can around a axle a little bit bigger than the barrel. Fasten the washers around the axle for support. You may use you hands, but my grandpa and I made a little rig to make it easier.

Wind it 2. Note: Before you go to the next step, you may want to rig a testing circuit to make sure the coil fires. Find the length that the barrel should be in your gun and cut it to the correct length. Find the projectile your are going to use, most likely a nail with a grounded down head, and position the coil so when the projectile end is at the very end off the barrel, the tip of the projectile is at the very begining of the coil. Last, put a stopper on the end of the barrel so that you may slide the projecile from the tip of the barrel.

## Barry's Coilgun Design Site

Now it is time to start laying out the circuits. Figure out where you want to lay the components. Make sure they will fit in the spots you want to lay them. The title says it all. Solder the componets together using this schematics below. Notice there is no relay.

### Oh no! Some styles failed to load. ðŸ˜µ

We tried a gun with a relay, put after a few shots, it nedded to be replaced. Since we are using a switch that cuts the battery on to make the circuit start charging, we need to solder a bare piece of wire to the switch on the circuit. Here are a few of the ones we did: -a lens from the camera to make the LED from the circuit appear larger when the capacitors charged -a cover to go over the big, bare spot on the top of our gun -a projectile holder -test prongs to make sure the gun was charging recommended.

And at v, holds about joules of energy. They should be able to handle the current that killed the relay. Reply 1 year ago. If you can bump it up to about joules of energy, you could propel a 10 gram projectile about fps. Reply 9 years ago on Introduction. Reply 7 years ago on Introduction.

You might want to add a couple more of those, say at least 4 of the same caps. And get a better switching device like an scr. Reply 8 years ago on Step 5. Reply 8 years ago on Introduction. BIG or small.

Its all relative, compared to the camera circuit capacitors if very large, but compared to other larger ones, its small.By Karl P.

Most conventional firearms operate by the action of expanding gasses forcing a projectile out of a barrel at high speed.

The propulsion for these systems is the detonation of gunpowder that causes an explosion behind a projectile positioned in a tube barrel that is closed at one end the breech. Systems that operate on gunpowder are extremely loud and leave residue in the barrel and action making them prone to malfunction and requiring considerable cleaning efforts for continued use. With new research and innovation in high-tech electronic weapons systems, gunpowder may soon become a thing of the past.

Caution The information contained in this article is dangerous and potentially life threatening. Use extreme caution when experimenting with high voltage and capacitor discharge circuits. If you are not experienced in the fabrication of such devices, then do not attempt to build this project.

Always short out the capacitor bank when working with it or the circuit. Regular firearm handling precautions should be taken. Always wear eye protection. The author and the publisher accept no liability and will not be held responsible for any injury or damages caused by the construction, use, or misuse of this device. Are Coil Guns New? The concept of electromagnetic guns has actually been around for a while.

The June Modern Mechanics magazine cover story featured an electric cannon built by an English designer named Dr. This approach sounds very similar to the modern compensated pulsed alternators compulsators being used to power the rail guns being developed at the University of Texas at Austin for the US Army electric gun program. For more information about the research going on at the University of Texas, visit their website at www.

An interesting story was printed in the November issue of Popular Science about an electric machine gun. It was claimed that the gun could fire rounds per minute using a series of electromagnets positioned along the barrel.

Make way for the electromagnetic coil guns! These devices substitute electromagnetic EM propulsion for gunpowder with nearly equivalent results in speed and kinetic energy. What better way to get acquainted with this futuristic technology than to build your own electromagnetic gun! The objective of this project is to design and construct a portable, self-contained electromagnetic coil gun. A coil gun is a type of rifle that uses an electromagnetic accelerator coil or a series of coils to accelerate a metallic projectile.

A fully functional rail gun was developed for this program although it was never deployed in space. Coil guns use a strong magnetic field to accelerate ferromagnetic projectiles. The projectiles used in coil and rail guns are often referred to as armatures. A large electric current is switched from a fast discharge storage device usually a capacitor bank into a coil of wire wrapped around a barrel to produce the strong magnetic field required for the rapid acceleration of the metallic projectile.

The projectile is situated at one end of the coil and is pulled to its center by magnetic induction. When the current is switched off, the projectile travels forward down the barrel, exits the gun and moves towards the intended target. The force applied to the armature is proportional to the change in inductance of the coil with respect to the change in position of the armature and the current flowing through the coil.

The force applied to the armature will always move it in a direction that increases the coil inductance. These systems are very quiet when projectiles are fired at velocities lower than the speed of sound, are clean, and require little maintenance.

More advanced coil gun designs incorporate a number of accelerator coils switched in sequence as the projectile moves down the barrel. The multiple coil design is intended to maximize projectile velocity. The major problem with electromagnetic weapons at the moment is the huge amount of energy lost when converting the electrical energy into kinetic energy.

This article will describe the general construction of the electromagnetic coil gun shown in Figure 1. This is a great project to explore a number of analog electronics concepts.Journal of Vibroengineering, Vol.

Deadliest weapons ever invented- Metal Storm

Received 1 September ; received in revised form 4 November ; accepted 5 January ; published 31 March Recently, a coil gun was brought to the attention of engineering community as electromagnetic alternative to the chemical launchers. Various studies were performed on coil gun systems focused on achieving the high muzzle velocity in military applications and for satellite launching. Most of these studies focused on improvement of muzzle velocity via increase in the size of the coil gun.

Present paper describes the process of design optimization where the size of the coli gun system is restricted. The design of experiment approach utilizes the orthogonal array table that reduces the required number of experiments. The design of experiment is carried out with a commercial PIAnO tool, where the finite element analysis is performed at each experimental point. Then, Kriging model is created to achieve accurate approximation in problems of many design variables or strongly nonlinear model.

The coil gun is optimally designed using an evolutionary algorithm EA as optimization technique. In order to verify the improvement of muzzle velocity by optimal design, the prototypes of coil gun system are manufactured and the experiments to launch the projectile are performed. Keywords: coil gun, electromagnetic launcher, finite element analysis, muzzle velocity, optimal design.

While the conventional launching system utilizing the chemical energy of the fuel has high cost and negative environmental impact, electromagnetic launching EML system present a viable projectile propulsion alternative with reasonably low cost and minimal environmental drawbacks such as production of carbon dioxide.

That is, the electromagnetic force of the coils attracts and launches the projectile [1]. In addition, many studies of coil gun projectile launching systems are underway in the Japan and the United Kingdom. Most of studies of coil gun system have focused on achieving high muzzle velocity because the coil gun system is mainly employed in military weapon systems and in space launching.

The larger coil gun can provide higher muzzle velocity of projectile, but it also increases the required space and increases costs of the system installation, operation, maintenance, and repair. In this paper, we performed the design optimization of the coil gun parameters to maximize the muzzle velocity while preserving the restricted size of the coil gun. Design variables are the number of axial turns of electromagnetic coil Nthe number of radial turns of electromagnetic coil Mthe initial distance between the projectile and the coil zthe inner radius of electromagnetic coil Rand the length of the projectile L.

These design variables are independent of each other but these are nonlinearly related to the magnetic force that determines the muzzle velocity. Five design variables are selected and an orthogonal design array is constructed. The analytical modeling is difficult to implement due to nonlinearity of the functional dependence of the muzzle velocity on the parameters listed above.

Subsequently, these analytical results are imported into the PIAnO and Kriging model is created to generate an accurate solution approximation of the non-linear model with many design variables. Finally, the coil gun is optimally designed using an optimization approach of the evolutionary algorithm EA []. The schematic diagram of electric circuit for coil gun launching system is shown in Fig.

### Electromagnetic Coil Gun Project

The electromagnetic coil is energized by discharging of a capacitor. The electromagnetic force of the energized coils attracts the projectile. If the electromagnetic coil is still energized after the projectile passes the longitudinal center of the electromagnetic coil windings, the magnetic force of the coils pulls the projectile in the direction opposite to the launching direction, and the projectile is decelerated. To prevent this, the electric current on the electromagnetic coils must be cut off just before the projectile passes the longitudinal center of the coil windings [7].

Schematic diagram of electric circuit for the coil gun launching system. The muzzle velocity of the coil gun system is proportional to the value of the maximum electric current flowing through the electromagnetic coil. However, there exists the maximum allowable value of the electric current exceeding which temperature will rise above the melting point of the coil material.

In this design, the AWG 12 commercial coil is utilized. Table 1 shows specification for the coil material [8].During these challenging times, we guarantee we will work tirelessly to support you. We will continue to give you accurate and timely information throughout the crisis, and we will deliver on our mission â€” to help everyone in the world learn how to do anything â€” no matter what. Thank you to our community and to all of our readers who are working to aid others in this time of crisis, and to all of those who are making personal sacrifices for the good of their communities.

We will get through this together. Updated: April 14, References. They use a current to charge copper wires and create an electromagnet to launch a projectile. To build a coil gun, all you need are a few tools, some wire, and a disposable camera.

Tip: Coil the end of the wire around the terminal before you solder if you want a more solid connection. Make sure to wear rubber gloves to prevent any accidental shocks.