Mixing apparatus and single-use apparatus for a mixing apparatus

An apparatus for a mixing apparatus for mixing at least two substances, comprising:

• a reusable apparatus configured for multiple use;
• and
• a single-use apparatus configured for a single use and comprising a flexible plastic mixing tank configured to receive the at least two substances to be mixed and a rotor arranged in the mixing tank, the rotor comprising an impeller configured to mix the at least two substances and a magnetically effective core having an inner diameter at least 2.6 times as large as a height of the magnetically effective core, and the rotor being configured to operate with a contactless magnetic drive, the single-use apparatus being configured to cooperate with the reusable apparatus and placed into a support tank of the reusable device, and the rotor being configured to be contactlessly driven by a stator of the reusable device about an axis of rotation by a rotating magnetic field, the rotor being free of coils and permanent magnets, the stator configured to magnetically contactlessly drive the rotor about an axis of rotation in an operating state, the stator comprising at least one permanent magnet configured to generate a permanent magnet flux and at least one winding configured to generate an electromagnetic flux, the permanent magnet flux and the electromagnetic flux both together forming a resultant force contributing to a torque that is capable of driving the rotor.