Electronically commutated electric motor with two rotor cores

Electronically commutated electric motor comprising:

• a stator, a rotor rotatably mounted relative to said stator;
• and
• at least one sensor for scanning a magnetic field that co-rotates with said rotor, where said stator includes a stator winding and a magnetically soft stator core, where said rotor includes, several permanent magnets arranged distributed in the circumferential direction of said rotor as well as a first magnetically soft rotor core for said permanent magnets, and where said permanent magnets, together with said first magnetically soft rotor core, are configured to generate a rotor magnetic field which, for operating said electric motor, will interact with the stator magnetic field of said stator when generated by said stator winding and said stator core, wherein said rotor has a second magnetically soft rotor core which adjoins said first magnetically soft rotor core in the axial direction of said rotor, where a non-magnetic separator element is arranged in the axial direction between said first magnetically soft rotor core and said second magnetically soft rotor core, the thickness of the non-magnetic separator element measured in the axial direction of said rotor is at least 10% of the outer diameter of the rotor, where said permanent magnets extend in the axial direction over said first magnetically soft rotor core, said non-magnetic separator element and said second magnetically soft rotor core, and where the magnetic field scanned by said sensor will be generated as a control magnetic field by said permanent magnets together with said second magnetically soft rotor core, wherein said at least one sensor faces an axial face end of the second magnetically soft rotor core.