Electronically commutated electric motor and method for controlling the same

An electronically commutated electric motor comprising:

• a stator comprising at least one stator coil;
• a magnetized rotor which is configured to rotate relative to the stator about an axis of rotation, the magnetized rotor comprising at least two opposite magnet poles which generate an excitation field;
• a static magnetic field sensor which is configured to detect the excitation field and to generate a rectangular sensor signal comprising signal edges, a full-wave signal period, and half-wave lengths of an N-signal level and of an S-signal level;
• a motor energizing device which is configured to drive the at least one stator coil and to generate a revolving stator field when triggered by a symmetric trigger signal;
• a memory unit which is configured to save parameter values;
• and
• an evaluation unit which is configured to generate the symmetric trigger signal,
• wherein,
• the evaluation unit generates the symmetric trigger signal via a shift compensation of an asymmetric shift of the signal edges of the rectangular sensor signal, the shift compensation being calculated based on a position of a received sensor signal edge, the full-wave signal period, and the half-wave lengths of the rectangular sensor signal.