Railgun Different Groove Of C Type Armature Simulation Research

Electromagnetic launch technology development,so that the great potential military applications of electromagnetic rail gun has been very good and effective excavation.As a key component of the armature electromagnetic rail guns,the relationship between the overall performance of the electromagnetic rail guns,has also been restricted to electromagnetic railgun combat the problem.Solid armature railgun armature typically use C-shaped armature.The C-shaped armature structural changes may affect the characteristics of the distribution of the armature,the armature the groove surface changes greatly changing the structure of the armature.To get the right groove face style armature,armature more optimized structure,need a variety of simulation in the groove surface affect the shape of the armature and analyze the characteristics of the distribution law.For solid armature railgun centralized distribution would cause the armature current temperature,concentration of Joule heat can cause heat to melt the material,the magnetic field will cause changes in focus bias current,magnetic induction force also increased wear of the armature and rails.In this paper,by using ANSYS finite element electromagnetic analysis software,based on the use of three-dimensional magnetic field labeled nodes-vector potential joint transient analysis method,the groove section is triangular,rectangular,parabolic,trapezoidal,linear plus five concave arc-shaped surface structure of the armature slot structure model simulations were carried out under static conditions.Focus on the various characteristics of the groove facing the armature current density,magnetic field and the Joule heat distribution,while the forces on the load current when the armature targeted analysis and comparison,to determine the appropriate C-shaped recesses of the armature groove face shape.Simulation found : rectangular,triangular,parabolic,trapezoidal,semicircular arc linear acceleration five different cross-sectional shape of the groove of the armature,the armature side corner recess,the recess facing the end face of the rear corners of the outside corner and an armature current-concentration region have appeared;armature Joule heat is similar to the current density distribution and the distribution of symmetry,which is the armature-track corresponding symmetrical structure,and the current conduction properties,the skin effect and proximity effects are the main factors affecting the distribution of its characteristics,in line with the theory of quasi-static electromagnetic field associated;field strength is mainly distributed in the four corners towards the end of the angle and the top surface of the groove and the groove surface of the armature surface of the groove internal surface area of the magnetic field strength was significantly higher than the surface on both sides;armature load current excitation armature wing forces are increasing with increasing current,and is proportional to the square of the current;armature to force most of the wing small;wing forces the armature is larger in the regions near the inner corner of the upper and lower sides of the armature,and have appeared on the outside of the corner flaps and the corresponding value in the opposite direction and the absolute value is larger region;appeared normal and reverse two directions relatively close to the value of the size.By rectangular,triangular,parabolic,trapezoidal,semicircular arc linear acceleration five different cross-sectional shape of the armature recess comparisons of : straight segment,circular arc groove shape of the armature current density,magnetic field intensity,the Joule heat distribution wing to force the consolidation of good solid track reasonable structure and shape of the armature.