Spinning rotor for mounting in electromagnetic bearing and driving system of rotor spinning machine workstation and process for producing thereof

The invention relates to a spinning rotor for mounting in an electromagnetic bearing and a driving system of a rotor spinning machine workstation and a process for producing thereof. The spinning rotor comprises a spinning rotor (1) with opening at two sides which is arranged at one end of a hollow carrier portion (2), a ferromagnetic ring used for a function of a magnetic bearing is arranged in the periphery of the carrier portion, an annular permanent magnet (3) used for a function of an electric driver is positioned in a cavity of the carrier portion, and the permanent magnet is formed of a multipole magnet or a plurality of segments. The carrier portion is made of ferromagnetic material and is provided with an outer peripheral seam portion (21) at an end part where the spinning rotor is mounted, a non-ferromagnetic ring (4) is arranged in the periphery of the carrier portion and close to the outer peripheral seam portion, and the ferromagnetic ring is arranged in the periphery of the carrier portion and c