Gauss Coil Gun by gabyion

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									Portable Mass Driver
       Presentation by:
        Brad Garrison
     Overview: Mass Drivers
 Classificationof devices that use
  electromagnetic forces to propel an
 More efficient than existing means of
A Brief “History” of Mass Drivers

Current Development:

   Navy/Army Research

   Amateur Research
                 Future Possibilities
   Peaceful Uses                   Military Uses

Ground Based Mass Drivers
                                    Rail Guns

Orbital Mass Drivers

                                    Electro Thermal Chemical Guns
Spacecraft Based Mass Drivers
            Types of Mass Drivers
   Rail

   Coil

   Gauss

   Disk
       Project Motivations
 Interest  in electromagnetism
 Little research being conducted

 Current designs are repetitive
Project Goals
   To construct a Gauss/Coil Gun that is portable and
    easily operated
   For the projectile to have a muzzle velocity of
    approximately 50m/s
   All components will be powered by a single
    rechargeable battery
   High rate of fire (60rpm)
   Extremely durable
   Completely safe for anyone to use
        Possible Designs

   Coil Gun

   Rail Gun
Rail Gun Limitations

   High “recoil” force
   Extremely high temperatures
   Armature vaporization
   Expensive materials
   More applicable to larger designs
Coil Gun

   Lower operating temperatures than
    Rail Gun
   No projectile vaporization
   Lower, more manageable “recoil”
                     Coil Parameters
►   NL : Number of Layers > 30 -- Inductance will be unreasonably

►   LL : Low Inductance, < 5 uH -- Unusually low inductance because
    the wire resistance had to be small in order to get the target current.
    This happens when the goal is very high current with a low voltage.

►   TC : Time Constant > 2.0 msec -- Current rise time is too slow.

►   OR : Outer Radius > 1.5 inches -- Too many layers of large wire. A
    smaller wire size will give a higher current density in a smaller space.

►   CD : Current Density > 1000 MA/m^2 -- Practical value for copper
    wire to limit the heating.
Start Position
Coil Cutoff
Coil Shielding
                       Projectile Design

Maximum Volume with Minimum Mass


Silicon Steel: the ideal material
    Drawbacks of Existing
   Most are driven off of
    AC power making
    portability impossible.
   DC designs operate at
    a much reduced power.
   All have a very low rate
    of fire
   Most are dangerous to
   All are very fragile
   Capacitors used are
    expensive and heavy
Preliminary Design
   Barrel must be strong enough to withstand
    compressive force of the coil
   Capacitor banks can not provide pluses fast
    enough for the desired rate of fire
   Capacitors may fail after repeated use
   Heat build up
Initial Design
Initial Design
   Induction coil produces high voltage pulses not high
    current pulses
   Electromagnets will drain the battery even in
    standby mode
   Optical gates will further drain battery and
    introduce more fragile components into the design
   Microprocessor vulnerable to magnetic fields and
                     Second Design
Induction coil replaced with photo capacitors

Electromagnets replaced with permanent magnets utilizing principals of
   the Gauss Rifle

This eliminates the need for photo gates as well
Second Design
               Charge Booster

(example is using a bank of 20 1.2V 0.25Amp AA batteries)
             Charge indicator
► Theindicator will
 signal when the
 capacitor is fully
Parallel Charging
               Resonance Charging

►   Resonance charging will be used to conserve energy and to decrease
    the charging time
              Possible Problems
► Fragilityof permanent magnets
► Resistive heating of the coil
► Over working the capacitors
► Battery life
         Future Improvements
► Optimized   coil
► Heatsinks
► Improved indicators
► Coilguns are not practical for portable
► Superconductors
► Specialized Capacitors/Semiconductors
► New coil designs

► Advanced   batteries

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