Method and arrangement for commutating an electronically commutated motor

An electronically commutated motor has a permanent-magnet rotor having: at least two rotor poles; at least one phase; a power stage; and a rotor position sensor. Associated therewith is a control circuit implemented to carry out the following steps in order to even out the motor current: A) after a change of the rotor position signal, referred to as a first pole change, a first value (I_MEAS(HCnt−1)) of the current through the at least one phase is ascertained; B) after a predetermined time span (T_Default+T_Offset(HCnt−1)), a new commutation is carried out; C) after a change of the rotor position signal, referred to as a second pole change, a second value for the motor current (I_MEAS(HCnt)) is ascertained; D) as a function of the difference between the first value (I_MEAS(HCnt−1)) and second value (I_MEAS(HCnt)), the value for the predetermined time span is modified.