Fast Computation Technique of Forces Acting on Moving Permanent Magnet

Abstract

Relative movement of permanent magnet and conductor evokes forces acting on both objects (Lorentz forces). These forces can be used for studying material characteristics of the conducting object (nondestructive testing). The paper compares various modeling techniques (transient, quasi-static, fast-quasi-static) of a moving permanent magnet above conducting plate using 2-D and 3-D finite-element method (FEM). The proposed approaches are applied to calculations of force profiles which enable to identify defects in conductor. The comparison of simulations with measurements performed on a long aluminum bar is also presented.