a cylindrical impeller extending in an axial direction from a first end to a second end, the cylindrical impeller including an annularly designed first magnetically effective core disposed at the first end, an annularly designed second magnetically effective core disposed at the second end, a plurality of vanes, each of the plurality of vanes being arranged between the first magnetically effective core and the second magnetically effective core with respect to the axial direction, and extending in the axial direction from a sheath, the sheath enclosing the magnetically effective core and configured to reduce eddy current losses;

a first stator, which is a bearing and drive stator, and which interacts with the first magnetically effective core as a first electromagnetic rotary drive; and

a second stator, which is at least a bearing stator, and with which the second magnetically effective core is capable of being magnetically levitated without contact with respect to the second stator,

the impeller configured to be magnetically driven without contact by the first and the second stators and to be magnetically levitated without contact with respect to the first stator and the second stator, the first stator arranged within the first magnetically effective core such that the first magnetically effective core surrounds the first stator, the first and second magnetically effective cores being configured to interact magnetically with the first and second stators to generate torque and generate forces for magnetic levitation.