Most commonly, WPT circuits use electromagnetic coupling between coils. These WPT circuits use capacitors to reduce reactive power. Figure 2 is a commonly chosen series–series capacitor representation which has been widely used because the capacitances can be chosen independent of the load and coupling conditions.
In the case of a multi-stage coil gun, setting this period is limited by the number of turns and capacitance because the acceleration time depends on the projectile’s initial velocity. This adjustment may be good for energy conversion efficiency because the circuit can be configured with a low-capacitance capacitor.
The electromagnetic FEA model of the capacitor-driven inductance coil gun was constructed to be able to optimize the coil's dimensions. The driving circuit was implemented as a dynamic model for the simulation of current. The coil gun was not designed for really shooting applications, i.e. the projectile is accelerated to a relatively low speed.
In cases where a solenoid coil is constructed using a copper wire with a large diameter since the corresponding self-resistance and inductance of the coil are low, a capacitance of at least 7000 uF is required to match the RLC function’s period. However, the corresponding supplied current’s magnitude increases.
Since a total of nine capacitors of the nine-stage coil gun should be charged, we developed a device that connects and disconnects the capacitors during charging using a relay to reduce the errors caused by the difference in the charging amounts of individual capacitors.
Therefore, a capacitance of 3000 uF, which is a capacity less than half of that of a coil gun system configured using a 1.7 mm diameter copper wire, was used to match the RLC period. However, the magnetic flux density transferred from the coil gun’s solenoid coil to the projectile increased. Thus, there was no significant velocity difference.
These coils are used in magnetic manipulation systems by adjusting the amplitude of the current [Kummer 2010]. Pulsewidth modulation (PWM) is the most frequently used technique to control the current, since it provides high efficiency, low power loss, and robustness to noise [Ma 2003].
Most commonly, WPT circuits use electromagnetic coupling between coils. These WPT circuits use capacitors to reduce reactive power. Figure 2 is a commonly chosen series–series capacitor representation which has been widely used because the capacitances can be chosen independent of the load and coupling conditions.
Transistor VT1 is designed to connect the electromagnet coil L to the DC voltage source E when the electromagnetic device is switched on. To quickly reduce current iL in the winding when the electromagnetic device is switched on, transistor VT1 is locked, but transistor VT2 allowing transferring the.
2.2 Numerical Modeling of a Coil Gun. In order to solve the variable coefficient ordiry differential equations in Sect. 2.1, it is necessary to obtain the value or change curve of loop inductance L, loop mutual inductance M and other system parameters, so as to obtain the change curve of armature velocity V, driving loop current, current filament loop current and other …
Tetra has recently designed and fabricated a 25-stage prototype electromagnetic coil gun. To date, five stages have been successfully tested. Initial results track very well with predicted …
conducting tube in electromagnetic forming process H. Choudhary, T. Kolge, R. Kapoor et al. -High voltage capacitor charging system in application of multi-stage coil gun B Winarno, R G Putra, I Yuwono et al.-This content was downloaded from IP address 40.77.167.182 on 19/02/2023 at 20:10. Content from this work may be used under the terms of the …
L: Inductance of the coil C: Capacitance of the capacitor R: Series resistance of the coil and equivalent resistance of the capacitor By solving Eq. (7), the electric current in the electro-magnetic coil can be described as follows: (8) If the electromagnetic coil is still energized after the projectile passes the longitudinal center of the ...
The inductor and capacitor have energy input and output but do not dissipate it out of the circuit. Rather they transfer energy back and forth to one another, with the resistor dissipating exactly what the voltage source puts into the circuit. This assumes no significant electromagnetic radiation from the inductor and capacitor, such as radio ...
Electromagnetic forming, by combining multiple coils and multiple capacitor banks, is an emerging manufacturing method that can produce flexible spatial-temporal patterns of the Lorentz force...
Abstract—Pulsewidth modulation (PWM) is the most commonly used technique to drive electromagnetic coils in mag-netic manipulation systems. Relatively low PWM frequencies …
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. The...
A high voltage magnetic pulse is designed by applying an electrical pulse to the coil. Capacitor banks are developed to generate the pulse current. Switching circuit consisting …
Abstract – This paper will present the design of a novel-type velocity-controllable electromagnetic coil launcher (EMCL). By studying the influence of initial capacitor voltage on the velocity of an EMCL, the launcher voltage can be set to precisely adjust the velocity of projectile launching.
Electromagnetic forming, by combining multiple coils and multiple capacitor banks, is an emerging manufacturing method that can produce flexible spatial-temporal patterns of the Lorentz force...
The electromagnetic FEA model of the capacitor-driven inductance coil gun was constructed to be able to optimize the coil''s dimensions. The driving circuit was implemented as a dynamic model for ...
A single-stage, sensorless, coil gun was designed to demonstrate the capability to accelerate a ferromagnetic projectile to high velocity. 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. The
Most commonly, WPT circuits use electromagnetic coupling between coils. These WPT circuits use capacitors to reduce reactive power. Figure 2 is a commonly chosen …
A single-stage, sensorless, coil gun was designed to demonstrate the capability to accelerate a ferromagnetic projectile to high velocity. This paper summarizes all important steps during coil …
A high voltage magnetic pulse is designed by applying an electrical pulse to the coil. Capacitor banks are developed to generate the pulse current. Switching circuit consisting of Double Pole Double Throw (DPDT) switches, thyristor, and triggering circuit is developed and tested. The coil current is measured using a Hall-effect current sensor ...
Key learnings: Capacitor Definition: A capacitor is a basic electronic component that stores electric charge in an electric field.; Basic Structure: A capacitor consists of two conductive plates separated by a dielectric material.; Charge Storage Process: When voltage is applied, the plates become oppositely charged, creating an electric potential difference.
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. The …
Tetra has recently designed and fabricated a 25-stage prototype electromagnetic coil gun. To date, five stages have been successfully tested. Initial results track very well with predicted values. Each coil is sequentially fired as the projectile moves down the bore.
Abstract—Pulsewidth modulation (PWM) is the most commonly used technique to drive electromagnetic coils in mag-netic manipulation systems. Relatively low PWM frequencies generate high-magnitude current ripple and magnetic field fluctuation. In this letter, coils are powered by a driver at PWM frequencies close to their self-resonant ...
We present in this paper a method of improving a coil gun circuit''s energy efficiency and acceleration performance. Particularly, the improvement was performed by designing a solenoid coil and capacitance for …
11.1 – Electromagnetic induction. Electromotive force (emf) When a conducting wire moves through a magnetic field, a potential difference is created along the wire. This phenomenon is called electromagnetic induction. When the movement of the wire is perpendicular to the magnetic field, the emf (ε) induced is given by ε = Bvl where B is the magnetic field, v is the velocity of …
Transistor VT1 is designed to connect the electromagnet coil L to the DC voltage source E when the electromagnetic device is switched on. To quickly reduce current iL in the winding when …
The device typically consists of an electromagnetic coil, capacitor, switch, barrel and movable core – projectile. The coil can be wound as a solenoid electromagnet with a ferromagnetic projectile placed at one of its ends (starting position). The launching process can be divided into three phases. The situation can be reflected in Figure 1. In the first phase the energy needed …
Abstract – This paper will present the design of a novel-type velocity-controllable electromagnetic coil launcher (EMCL). By studying the influence of initial capacitor voltage on the velocity of an …
We present in this paper a method of improving a coil gun circuit''s energy efficiency and acceleration performance. Particularly, the improvement was performed by designing a solenoid coil and capacitance for projectile velocity enhancement in a multi-stage coil gun, based on simulations and experiments.
A single stage consists of a series capacitor CO, starter switch So, and coil Lo. A second switch, S, is placed across the capacitor CO to crowbar voltage reversals. The RLC circuit that is formed is underdamped and tries to reverse the voltage across the capacitor Co. Switch, S, is …
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. The...
Stay updated with the latest news and trends in solar energy and storage. Explore our insightful articles to learn more about how solar technology is transforming the world.