Rotor for a canned motor

A wet-running centrifugal pump comprising:

• a can;
• and
• a rotor received in the can, the rotor having:
• (i) a rotor shaft for the drive of a pump impeller the rotor shaft having a central longitudinal axis, a first shaft section, and an encapsulation, the first shaft section extending along the longitudinal axis and having a free end on which the impeller is arranged, and
• (ii) at least one permanent magnet within the encapsulation of the rotor shaft, the at least one permanent magnet having an axial length, the encapsulation enclosing the at least one permanent magnet in a fluid tight manner,
• wherein along the axial length of the at least one permanent magnet, the rotor shaft is formed only by an outer peripheral part of the encapsulation, the outer peripheral part of the encapsulation being radially spaced apart from the central longitudinal axis by at least a portion of the at least one permanent magnet, the first shaft section being one piece with and formed by an extension of the outer peripheral part of the encapsulation, and
• wherein a diameter of the rotor is essentially the same over an entire length of the rotor, and
• wherein, over the entire length of the rotor, a radial distance between the rotor and the can is at least equal to a radial thickness of an outer bearing shell for a first bearing seat.