Coil Gun Electromagnetic Launcher (EML) System with Multi-stage Electromagnetic Coils

Lee, Su-Jeong; Kim, Ji-Hun; Song, Bong Sob; Kim, Jin Ho

doi:10.4283/jmag.2013.18.4.481

Cited by 32 publications

(5 citation statements)

References 8 publications

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“…Two main kinds of electromagnetic launchers are rail and coil launchers. 15,16 The rail launcher is not appropriate for a weaving machine because a spark occurs between the rail and the projectile. Also, it needs a large power source and a huge amount of heat is produced at the contact points between the rails and the projectile.…”

mentioning

confidence: 99%

Design and modeling of an electromagnetic launcher for weft insertion system

Owlia

Mirjalili

Shahnazari

2018

Textile Research Journal

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An electromagnetic launcher can be used as an accelerator for yarn attached to a ferromagnetic projectile. As a result, yarn endures a specific amount of tension. In addition to the yarn variables and the type of weft insertion system, the parameters of the weft yarn accelerator strongly affect the weft yarn velocity, its tension, and consequently the fabric quality. An applicable model that can represent the relationship between input and output parameters of this weft insertion system is very useful for predicting the strike of the projectile. Therefore, in this research a 3D imitating launching model was developed by the finite element method. A coil electromagnetic launcher was employed. An experimental methodology using an image-processing technique was also utilized to measure the projectile velocity. Numerical results were compared with experimental results to verify the numerical procedure. A validated model can be a reliable tool to investigate the effects of many process parameters on the strike of the projectile and to optimize them. Therefore, the system parameters can be scientifically defined by this model to insert a weft yarn.

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mentioning

confidence: 99%

Design and modeling of an electromagnetic launcher for weft insertion system

Owlia

Mirjalili

Shahnazari

2018

Textile Research Journal

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“…The capacity of the capacitor is 5000 mF, and the charging voltage is 400 V ( Table 2). The resistance R was calculated using equation (1). Figure 6 shows the design variables for the solenoid coil, and Table 3 shows the definitions and values for the design variables.…”

Section: Structure Of Two-stage Coil Gunmentioning

confidence: 99%

“…A multi-stage solenoid coil design is required to improve the final velocity of the projectile. [1][2][3][4] The projectile moves through the passage and accelerates when current is applied to the next solenoid coil. The final velocity of the projectile is significantly affected by the discharge time of the capacitor connected to the solenoid coil according to the projectile's position.…”

Section: Introductionmentioning

confidence: 99%

Control of discharge time using physical contact in a two-stage coil gun

Kim

2019

Advances in Mechanical Engineering

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In this study, a coil gun was designed using a trigger that can discharge a capacitor using physical contact. Controlling the discharge time of the capacitor in a multi-stage coil gun is an important factor for the final velocity of the projectile. To control the discharge time, we used the physical contact of the projectile and the trigger and controlled the point in time when discharge occurs by sensing the projectile location using a sensor. Controlling the discharge using sensors allows for more accurate timing control than physical discharge systems, but the circuit is more complex, and the high current results in a higher risk of malfunction and higher costs. In contrast, systems that use physical contact are simple, have low risk of malfunction, and have low cost. The velocity of the projectile was predicted using the electromagnetic analysis simulation program MAXWELL, and the final velocity of the projectile was compared to the results of a prototype.

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“…The stator contains coils and the translator is a moving-magnet where the force is calculated using the Lorentz force equation. The earlier references [4][5][6][7][8] mainly focused on the design and performance of electromagnetic propulsion systems with limitations such as: each of the drive coil length equal to projectile lengths, neglecting the flux distributions, infinite permeability of the core materials. The control of the propelling object was not discussed in any of the past literatures.…”

Section: Fig 13d Structure Of the Proposed Designmentioning

confidence: 99%