Method for determining the rotor position of an electronically commutated multi-phase DC motor having a pole number ≥ 2 and a multi-strand winding system and also a commutating device for generating phase voltages (U ph_u, U ph_v, U ph_w,) in the winding system, wherein the DC motor comprises a rotor and a stator, characterized by the following method steps: (a) generating multiple test voltage pulses (V 0, V 2, V 4, V 6, V 8, V 10) in the winding system with a predetermined duty cycle ΔT by means of the commutating device in different phase positions that are distributed over 360°; (b) measuring the current values (I 0, I 2, I 4, I 6, I 8, I 10) of the current responses to the test voltage pulses (V 0, V 2, V 4, V 6, V 8, V 10) with the expiry of the duty cycle ΔT of the respective test voltage pulses (V 0, V 2, V 4, V 6, V 8, V 10); (c) approximating the measured current values (I 0, I 2, I 4, I 6, I 8, I 10) by means of a periodic function approximation I(α s) from the superposition of a fundamental wave that has an amplitude I EMF and the superposition of the associated first harmonic wave that has an amplitude I Ind in dependence upon the phase position α s of the test voltage pulses V 0, V 2, V 4, V 6, V 8, V 10), wherein the fundamental wave emulates the temporal progression of the back-EMF voltage of the stator and the first harmonic wave emulates the temporal progression of the inductance of the stator of the DC motor; (d) determining an amplitude ratio value I EMF /I Ind of the amplitudes I EMF and I Ind of the fundamental wave and of the first harmonic wave of the function approximation I(α s); (e) determining the rotor position as an EMF angle α EMF from the argument (αs - α EMF) of the fundamental wave of the function approximation I(α s) and/or as an inductance angle α Ind from the argument of the first harmonic wave of the function approximation I(α s) in dependence upon the amplitude ratio I EMF /I Ind, wherein the EMF angle α EMF indicates the phase offset of the sinusoidal progression of the back-EMF voltage of the stator with respect to the function approximation I(α s) and the inductance angle α Ind indicates the phase offset of the sinusoidal progression of the inductance of the stator with respect to the function approximation I(α s). (a) generating multiple test voltage pulses (V 0, V 2, V 4, V 6, V 8, V 10) in the winding system with a predetermined duty cycle ΔT by means of the commutating device in different phase positions that are distributed over 360°; (b) measuring the current values (I 0, I 2, I 4, I 6, I 8, I 10) of the current responses to the test voltage pulses (V 0, V 2, V 4, V 6, V 8, V 10) with the expiry of the duty cycle ΔT of the respective test voltage pulses (V 0, V 2, V 4, V 6, V 8, V 10); (c) approximating the measured current values (I 0, I 2, I 4, I 6, I 8, I 10) by means of a periodic function approximation I(α s) from the superposition of a fundamental wave that has an amplitude I EMF and the superposition of the associated first harmonic wave that has an amplitude I Ind in dependence upon the phase position α s of the test voltage pulses V 0, V 2, V 4, V 6, V 8, V 10), wherein the fundamental wave emulates the temporal progression of the back-EMF voltage of the stator and the first harmonic wave emulates the temporal progression of the inductance of the stator of the DC motor; (d) determining an amplitude ratio value I EMF /I Ind of the amplitudes I EMF and I Ind of the fundamental wave and of the first harmonic wave of the function approximation I(α s); (e) determining the rotor position as an EMF angle α EMF from the argument (αs - α EMF) of the fundamental wave of the function approximation I(α s) and/or as an inductance angle α Ind from the argument of the first harmonic wave of the function approximation I(α s) in dependence upon the amplitude ratio I EMF /I Ind, wherein the EMF angle α EMF indicates the phase offset of the sinusoidal progression of the back-EMF voltage of the stator with respect to the function approximation I(α s) and the inductance angle α Ind indicates the phase offset of the sinusoidal progression of the inductance of the stator with respect to the function approximation I(α s).