Magnetic and transport eddy-current anomalies in cylinders owing to magnetization rotations

Abstract For a magnetic conducting cylinder with a coaxial core, where the spontaneous magnetization M s is helical, the technical magnetization under an axial AC magnetic field or AC transport current is carried out by M s rotations, which induce normal and lateral eddy currents. The low-frequency eddy-current anomaly factors for the magnetic and the transport case, η , are calculated as functions of the radius ratio of the core to the cylinder, p = r b / r 0 , the scalar susceptibility of the shell normalized to the normal susceptibility of the core, q = χ s / χ zz or χ s / χ φφ , and the helical angle with respect to the z -axis, α . It is shown that for the typical case of α = π /4, the lateral-eddy-current loss is appreciably less and greater than the normal one in the magnetic and transport case, respectively, which is in contrast to the situation of a slab where both losses are equal.