A method of manufacturing a centrifugal wheel for a mixing or pumping device with a magnetically levitated centrifugal wheel, includes providing an impeller configured to be magnetically levitated, has and having a permanent magnetic core, permanent magnetic core completely enclosed by a sheathing, the sheathing including plastic, and a plurality of blades to mix or convey substances provided on the sheathing, removing all blades from the sheathing, separating the permanent magnetic core from the sheathing, the permanent magnetic core being demagnetized before the permanent magnetic core is separated from the sheathing, attaching an encapsulation including plastic, and which completely encloses the permanent magnetic core, and attaching a plurality of vanes to the encapsulation.

A method for manufacturing a rotor for devices having a magnetically levitated rotor includes providing an impeller configured to be magnetically levitated, has and having a magnetically active core, is the magnetically active core completely enclosed by a sheathing, the sheathing comprising a plastic, and at least one impeller element configured to interact with substances is provided on the sheathing, providing a magnetization device to demagnetize or magnetize the magnetically active core, the magnetization device comprising a receptacle into which the impeller or the rotor is capable of being inserted, inserting the impeller into the receptacle and demagnetizing the magnetically active core, separating the magnetically active core from the sheathing, attaching an encapsulation to the magnetically active core, the encapsulation comprising a plastic and completely enclosing the magnetically active core, and attaching at least one conveyor element to the encapsulation.