Characteristic Analysis for Electromagnetic Force of Circnlar Metal plate under Time-Varying Magnetic Excitation
Jiang Yixuan,Gao Yuanwen,Zhou Youhe
(Department of Mechanics, Lanzhou University, Lanzhou 73000,China)

Abstract: Evaluation of electromagnetic force is essential in electromagnetic fo rming, a new style of processing technique. Based on Maxwell equations, a theore tical derivation is presented instead of the existing formula P_m=B²2/2μ₀ for the distribution characteristics of eddy current in a circular metal plate under the transverse magnetic exitation, and the analytic expression of electroma gnetic force is deduced to modify magnetic pressure formula. The results indicat e that modified magnetic pressure formula is coincident with the traditional on e for the workpiece of larger radius in higher frequency magnetic fields, while the formula enables to simulate the situations of small-scale workpiece under lower frequncy magnetic exitations.
Keywords: circular metal plate, electromagnetic forming, distribution of eddy current, equivalent magnetic pressure force.