a claw - pole machine has a stator and a rotor , and an exciter coil that is wound on a solid core in the rotor . the solid core extends in the radial direction into two claw magnet wheels that end in a plurality of claw - pole fingers , having a plurality of solid , radially - outward - oriented parts , and has a plurality of tangential side surfaces , which alternate axially , starting from two sides , wherein a plurality of u - shaped metal sheets are attached to the solid , radially - outward - oriented parts of the claw - pole fingers . the u - shaped metal sheets are layered one on top of the other in the axial direction to prevent eddy currents .