A NEW METHOD FOR COMPUTATION OF DYNAMIC INDUCTANCE OF TUBULAR MOTOR

Abstract

Static and dynamic inductances are critical technical parameters of electromagnetic systems during the designing process. The static inductance is used for estimating the stored energy, magnetic flux linkage in coils at instantaneous currents. The dynamic inductance interprets the interrelation between the instantaneous flux linkage and currents governing the transient process in coils. This article presents a study and computation of coil inductance and force profile in a tubular electromagnetic motor with closed type magnetic circuits. The equations for dynamic inductance of the drive coil and the magnetic force on the basis of the magnetic field analysis are derived. The derived expressions handle the flux distribution at the boundary layers of the coil under consideration so that the leakages effects are reflected in the comparisons unlike earlier methods available in literature. Further a simulation methodology is proposed with the model parameters for the best system geometry. Electromagnetic finite field distributions are validated using CAD software