ELECTRIC MACHINE

The invention relates to an electric machine (10) comprising a stator (16) that has a stator core (17). Said core has a substantially cylindrical opening (60) having a central axis (63), and the opening (60) accommodates a rotor (20). The stator core (17) has an axial length (L17a) and said core (17) holds a stator winding (18) together with the rotor (20) which has a rotational axis (66). The rotor (20) has an axial end face (69), on which a fan (30) with fan blades (72) is located and is non-rotatably connected to the rotor (20). The rotor (20) has an electromagnetically excitable path (75) having a pole shank (78), a respective pole plate (22, 23) adjoining each axially rotational end (80, 82) of said shank. Claw poles (24) having a north polarity extend from one pole plate (22) and claw poles (25) having a south polarity extend from the other pole plate (23), said claw poles (24) and (25) alternating between north and south polarities around the periphery of the rotor (20). The rotor (20) has a gap (21) with a longitudinal direction (86) between two neighbouring claw poles (24, 25) of opposite polarity, a permanent magnet system (88) being provided in the gap (21) between the two claw poles (24, 25). The permanent magnet system (88) has a length (L88) in the longitudinal direction (86) of the gap (21). The rotor comprises a pole shank (78) located radially inside the claw poles (24, 25), said shank having an axially rotational length (L78), and the ratio of the length (L88) of the permanent magnet system (88) to the axially rotational length (L78) of the pole shank (78) is greater than 1.3.