about what equipment you might consider buying and a list of my
Coils Description -
are the coils which are used for the majority of the basic experimental
Coils Data -
gives the parameters of the test coils.
range of projectile types have been produced for general experimental
work. This details the projectile parameters.
Energy Sources -
not new types of energy sources, just the specific details of
the systems I'm using.
experimental rig is where most of the coilgun testing is conducted.
At the moment it consists of a base platform with coil mounting
flanges, a raised module platform.
Speed Trap -
system allows the velocity of the projectile to be determined
to a high degree of accuracy.
Sensor Module -
is a simple module which can be inserted in the current path to
basic introduction to measuring the various different parameters
during a firing sequence.
and Switching Systems:
Loop Pulse Trigger Module -
on the 555 timer chip, this module can produce any pulse width
between 100us and 100ms.
Trigger Module -
details a basic optical triggering device which is suitable for
velocities up to 50m/s.
MOSFET Module -
self contained module with screw terminals is described. This
is the switching device used for all of the low power experimental
Switching Issues -
into the potential problems of switching MOSFET devices.
Transient Suppression -
experiment takes a brief look at the overshoot and ringing which
occur when the current is switched off in a coil circuit.
Voltage Trigger -
induced voltage trigger for use with single stage coilguns is
Induced Voltage Trigger -
trigger stages are combined to provide a cascading trigger system.
Loop Pulse Triggering -
triggering method is used to investigate how critical the current
timing needs to be.
with an optical gate is a highly reliable method. These experiments
look at how this triggering method compares to the best open loop
Voltage Triggering -
of the dynamic flux linkage can be used to determine the projectile's
position in the coil. This method is investigated for both battery
and capacitor voltage sources.
Commutation Modification -
rate of current decay in a coil can have a significant effect
on the resulting muzzle speed. These experiments look at a 'constant
voltage' decay in which several commutating diodes are connected
Position Effect -
launch position is shown to have a large effect on the resulting
velocity and efficiency.
Fired Coilgun -
simple thyristor fired coilgun is examined.
Flux Linkage -
powdered-iron shell flux path is used to improve the efficiency
of a single stage coilgun.
Modified: 10 Jan 2005