Electrical rotary drive

A blood pump comprising an electrical rotary drive, the rotary drive comprising:

• a magnetically journalled rotor;
• a stator comprising:
• a drive winding comprising at least two loops for producing a magnetic drive field which produces a torque on the rotor;
• and
• a control winding comprising at least three loops for producing a magnetic control field to regulate the position of the rotor with respect to the stator;
• wherein each loop of the drive winding belongs to a different electrical drive phase and each loop of the control winding belongs to a different electrical control phase;
• and
• a setting device that supplies each loop of the drive winding and each loop of the control winding with a phase current or a phase voltage as a setting parameter;
• wherein the setting device is designed in such a manner that the setting parameter for each loop of the drive winding and for each loop of the control winding can be regulated independently of the setting parameters for the other loops;
• wherein the drive winding has a number of pole pairs equal to p and the control winding has a number of pole pairs equal to p±1;
• and
• wherein the rotor of the rotary drive is permanent-magnetically excited and has a plurality of vanes for forwarding blood, so that the rotor of the rotary drive also serves as pump rotor.