An induction coil contains the beginning section of metal sheet, a plurality ofrepeater section of sheet metal, and the end section of metal sheets are mutually sequential cohesion, and each relay section of metal sheet is alsoconnected, each adjacent link part relay section of metal sheets folded formthe folded part, and sequentially folded around, and with the stack around thenumber of hops to the sheet metal layers of warehouse into a box type multilayered coil structure, and the folding portions adjacent layer relay section of metal sheet is not in the same straight axis azimuth, but each other astaggered angle and. The folding part in folding deformation even constitutes a insulating disposal damage the surface, also because of the folding part isstaggered arranged, and can prevent the short circuit, and always maintain the use function of the induction coil is excellent.
Single stage induction coilgun launch coil and projectile are simplified into twosame diameter and coaxial placed current loop. When the transmitting coil a through a rising current of I0, the strength of the magnetic field emissionaround the coil will also rise, resulting in the increase of the magnetic flux through the body. By Lenz's law shows the projectile will induce a current, and this current occurred in magnetic field is obstruct the projectile flux continues to increase, that is to say the current direction of the electric current and the transmitting coil a in the opposite direction of magnetic field in the body, Binduction magnetic field and the emission coil is on the contrary. Among them is mutual overhead, because the emission coil is fixed, so to accelerate theprojectile force direction trek.
The primary disadvantage of the coil is: synchronization relatively messy; when high velocity projectile coil current is usually very large, need to think aboutoverheating bring doubt; induction voltage is very high and back electromotive force. Because of rapid current change requirement of synchronization will occur induction voltage. High speed motion of carrying electric coil andprojectile detour to happen back electromotive force, and the higher the speedcounter electromotive force is larger, typically 20km/s counter electromotive force of about 100kV.
In this way, the coil current and back EMF of the drive coil are bound speed.Lead to overheating of the current I and bound speed the EMF U and impedance and U equivalent, are in the reference the [4] table to show the corresponding formula method, and the amount and the rail gun were seen;under shock load case of large projectile force also bound to speed up themechanical strength of the coil. But the experiment found a strangeappearance, namely the projectile coil existence will reduce applied to thedrive coil outwardly expanding vigorously, this and the gun bore stresssituation just the opposite.
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