Electromagnetically actuated, single-surface friction coupling, without a rotor slip ring

Electromagnetically actuated, single-surface friction coupling without a rotor slip-ring, comprising a rotor element (2) mounted so that it can rotate, a fixed magnet body (6) provided with a magnet coil (8) and an armature element (28) which can rotate but is mounted so that it can be axially displaced, the armature element (28) being pot shaped with a ring disc shaped area (28A) and a cylindrical jacket shaped area (28B), such that the cylindrical jacket shaped area (28B) of the armature element extends with a narrow air gap axially along an outer jacket surface (12) of the magnet body, and an axial working air gap (S) that can be bridged over is present between the ring disc shaped area (28A) of the armature element and an axially opposed, ring disc shaped friction surface (30) of the rotor element (2), the armature element (28) being able to be displaced axially by magnetic force and brought into frictionally coupled engagement with the rotor element (2), and such that the rotor element (2) is arranged on the drive output side and the armature element (28) is arranged on the drive input side.