Electric motor with magnetic gear arrangement

Electric machine (30) comprising an electric motor (15) and a magnetic gear arrangement (20),

• wherein the electric motor (15) is a brushless motor,
• wherein the electric motor (15) comprises
• an internal stator (31) with a first number of electric windings (32) in the form of wire coils disposed circumferentially around a longitudinal axis (24) of the electric machine (30) and;
• an external rotor (34) with a second number of permanent magnets (35) of alternating polarities rotatable externally around the internal stator (31) about the longitudinal axis (24) during operation of the electric motor (15),
• wherein the magnetic gear arrangement (20) is located in a manner displaced along the longitudinal axis (24) in respect to the electric motor (15), and
• wherein the magnetic gear arrangement (20) comprises
• a first magnetic element (41) with a third number of permanent magnets (42),
• a second magnetic element (44) with a fourth number of permanent magnets (45), and
• a modulator (48) comprising a fifth number of ferromagnetic elements (49) disposed between the third number of permanent magnets (42) and the fourth number of permanent magnets (45),
• wherein the first magnetic element (41), the second magnetic element (44) and the modulator (48) are rotatable in respect to each other about the longitudinal axis, wherein one of the first magnetic element (41) and second magnetic element (44) or the modulator (48) is connected to the external rotor (34) of the electric motor (15) in a torque proof manner, and wherein another one of the first magnetic element (41) and second magnetic element (44) or the modulator (48) is connected to an output shaft (46) of the electric machine (30) in a torque proof manner,
• characterized in that a venting element (22) is attached to or forms part of at least one of the external rotor (34), first magnetic element (41) and second magnetic element (44) of the electric machine (30).