Magnetic coupling assembly for coupling of a first rotary shaft and a second rotary shaft, comprising: a first rotary hub (4; 104) connectable to the first shaft; a second rotary hub (5; 105) connectable to the second shaft; at least one rotatable inductor rotor (20, 21; 130, 131) arranged to co-rotate with the rotation of the first rotary hub (4; 104); at least one rotatable magnet rotor (30; 129) comprising a set of permanent magnets , the at least one rotatable magnet rotor connected to the second rotary hub (5; 105) and arranged to co-rotate with the rotation of the second rotary hub (4; 104), wherein the at least one rotatable inductor rotor (20, 21; 130, 131) and the at least one rotatable magnet rotor (30; 129) are arranged so as to transfer torque between the at least one magnet rotor and the at least one inductor rotor; wherein the at least one rotatable inductor rotor (20, 21; 130, 131) comprises a central opening and further comprises: an inductor rotor front plate facing the magnet rotor (30; 129) and comprised of a non-magnetic electrically conductive material; an inductor rotor back plate connected to the back side of the inductor rotor front plate and comprised of magnetic material; characterized in that one or more passages inside the at least one rotatable inductor rotor (20, 21; 130, 131) between the inductor rotor front plate and the inductor rotor back plate and arranged for allowing the passage of ambient fluid, such as ambient air, from the central opening radially outward so as to cool the inductor rotor front plate and inductor rotor back plate . a first rotary hub (4; 104) connectable to the first shaft; a second rotary hub (5; 105) connectable to the second shaft; at least one rotatable inductor rotor (20, 21; 130, 131) arranged to co-rotate with the rotation of the first rotary hub (4; 104); at least one rotatable magnet rotor (30; 129) comprising a set of permanent magnets , the at least one rotatable magnet rotor connected to the second rotary hub (5; 105) and arranged to co-rotate with the rotation of the second rotary hub (4; 104), wherein the at least one rotatable inductor rotor (20, 21; 130, 131) and the at least one rotatable magnet rotor (30; 129) are arranged so as to transfer torque between the at least one magnet rotor and the at least one inductor rotor; wherein the at least one rotatable inductor rotor (20, 21; 130, 131) comprises a central opening and further comprises: an inductor rotor front plate facing the magnet rotor (30; 129) and comprised of a non-magnetic electrically conductive material; an inductor rotor back plate connected to the back side of the inductor rotor front plate and comprised of magnetic material; characterized in that one or more passages inside the at least one rotatable inductor rotor (20, 21; 130, 131) between the inductor rotor front plate and the inductor rotor back plate and arranged for allowing the passage of ambient fluid, such as ambient air, from the central opening radially outward so as to cool the inductor rotor front plate and inductor rotor back plate . an inductor rotor front plate facing the magnet rotor (30; 129) and comprised of a non-magnetic electrically conductive material; an inductor rotor back plate connected to the back side of the inductor rotor front plate and comprised of magnetic material; characterized in that one or more passages inside the at least one rotatable inductor rotor (20, 21; 130, 131) between the inductor rotor front plate and the inductor rotor back plate and arranged for allowing the passage of ambient fluid, such as ambient air, from the central opening radially outward so as to cool the inductor rotor front plate and inductor rotor back plate . <EOS>