The existence of the transverse eddy current field corresponding to emf Matteucci was taken into account in the equation of the domain wall motion in sandwich structure appearing during magnetizing of amorphous ribbon with helical magnetic anisotropy. The obtained equation together with the "emf Matteucci / emf of induction coil - the domain wall coordinate" independent relation lets determine the dependence of the damping coefficient beta (r) (x) on domain wall coordinate. We discovered the sharp maximum beta (r) (x) in the middle section of the domain wall run.