An electric motor with a stator (10, 40) which is designed to carry an energizable winding, with a rotor which is mounted so as to be rotatable relative to the stator in a circumferential direction about an axis of rotation, and with a stationary support unit (20, 30, 50, 60) for fastening and holding the stator, wherein bow-like raised portions (14, 44) with interposed radial recesses (16, 46) are formed on a stator circumferential surface and a slot-like stator axial opening (18, 48) extends in the circumferential direction at least partially along the raised portions, wherein the raised portions are used to form a frictional connection with a circumferential surface of the carrier unit, wherein the electric motor is embodied as an electric external rotor motor with the rotor surrounding the stator and the carrier unit comprising a carrier tube which is enclosed by the stator and to which the stator is fixed, wherein, on the stator circumferential surface, which is embodied as the inner circumferential surface of the stator, the raised portions are aligned radially inward and, in cooperation with the circumferential surface of the carrier unit, which is embodied as the outer circumferential surface of the carrier tube, produce the frictional connection in the form of a clamp connection, wherein, in order to form a rotary-clamp connection, the carrier unit (30, 60) has projecting portions (34, 64) which project radially from the circumferential surface of the carrier unit and are arranged so as to be distributed along this circumferential surface with recessed portions (36, 66) arranged therebetween, wherein, in an assembled state, the projecting portions are flush between the carrier unit and the stator (10, 40), have a clearance, and can be situated opposite the portion-wise radial recesses (16, 46) on the stator circumferential surface in order to enable the stator (10, 40) to be plugged on axially, and, in a fastening state, preferably the operational readiness state of the electric motor, in which the stator is held on or in the carrier unit in a rotationally rigid manner and in which the relative position between the stator and the carrier unit is rotated about the axis of rotation compared to the assembled state, produce a clamping effect between the circumferential surface of the carrier unit and the stator circumferential surface. with a rotor which is mounted so as to be rotatable relative to the stator in a circumferential direction about an axis of rotation, and with a stationary support unit (20, 30, 50, 60) for fastening and holding the stator, wherein bow-like raised portions (14, 44) with interposed radial recesses (16, 46) are formed on a stator circumferential surface and a slot-like stator axial opening (18, 48) extends in the circumferential direction at least partially along the raised portions, wherein the raised portions are used to form a frictional connection with a circumferential surface of the carrier unit, wherein the electric motor is embodied as an electric external rotor motor with the rotor surrounding the stator and the carrier unit comprising a carrier tube which is enclosed by the stator and to which the stator is fixed, wherein, on the stator circumferential surface, which is embodied as the inner circumferential surface of the stator, the raised portions are aligned radially inward and, in cooperation with the circumferential surface of the carrier unit, which is embodied as the outer circumferential surface of the carrier tube, produce the frictional connection in the form of a clamp connection, wherein, in order to form a rotary-clamp connection, the carrier unit (30, 60) has projecting portions (34, 64) which project radially from the circumferential surface of the carrier unit and are arranged so as to be distributed along this circumferential surface with recessed portions (36, 66) arranged therebetween, wherein, in an assembled state, the projecting portions are flush between the carrier unit and the stator (10, 40), have a clearance, and can be situated opposite the portion-wise radial recesses (16, 46) on the stator circumferential surface in order to enable the stator (10, 40) to be plugged on axially, and, in a fastening state, preferably the operational readiness state of the electric motor, in which the stator is held on or in the carrier unit in a rotationally rigid manner and in which the relative position between the stator and the carrier unit is rotated about the axis of rotation compared to the assembled state, produce a clamping effect between the circumferential surface of the carrier unit and the stator circumferential surface.