A radial blower (1) comprises a housing (2) with an outlet opening (5) in tangential direction and at least one axial suction opening (3), a conveying group (6, 7) arranged inside the housing (2) and having an electric motor (6) and an impeller (7) connected to a rotor (9) of the electric motor (6), in which the rotor (9) comprises a circumferential wall (25) moulded from synthetic material mixed with particles of ferromagnetic material and magnetised with a HALBACH magnetic pattern with circumferentially alternating poles.