Determination method for determining one electrical and at least one mechanical transfer function (GE, GMP, GMR) of an electric machine which is connected via an inverter to an electrical supply network, - wherein the electrical transfer function indicates to what extent a current of the same frequency (f) is excited in the electric machine during an excitation with a voltage of a particular frequency (f), - wherein the at least one mechanical transfer function (GMP, GMR) indicates to what extent a mechanical vibration of the same frequency (f) is excited in the electric machine during excitation with a radial force (FRP, FRR) in the air gap of the electric machine which has a certain frequency (f), - wherein by appropriate control of the inverter a ramp-up of the electric machine from an initial speed to a final speed is performed, - wherein during the ramp-up of the electric machine a respective voltage curve (U(t)) is applied to the electric machine, - wherein the respective voltage curve (U(t)) is determined such that an associated voltage spectrum (U(f)) contains predetermined portions (ai) of predetermined harmonics of the fundamental frequency in addition to a fundamental vibration at a fundamental frequency, - wherein by means of appropriate sensors (10 to 12) at least one resulting corresponding respective current path (I(t)) and a resulting corresponding mechanical vibration curve (S(t)) are detected, - wherein based on the respective current path (I(t)) a corresponding respective current spectrum (I(f)) is determined and based on the respective current spectrum (I(f)) and the respective voltage spectrum (U(f)) the electrical transfer is determined for at least one of the predetermined harmonics of the fundamental frequency, - wherein based on the respective current spectrum (I(f)) a corresponding respective radial force spectrum (FRR(f), FRP(f)) is determined in the air gap of the electric machine, - wherein based on the detected respective mechanical vibration curve (S(t)) a corresponding respective vibration spectrum (S(f)) is determined and - wherein based on the respective radial force spectrum (FRR(f), FRP(f)) and the respective vibration spectrum (S(f)) for at least one harmonic of the fundamental frequency the at least one mechanical transfer function (GMP, GMR) of the electric machine is determined. - wherein the electrical transfer function indicates to what extent a current of the same frequency (f) is excited in the electric machine during an excitation with a voltage of a particular frequency (f), - wherein the at least one mechanical transfer function (GMP, GMR) indicates to what extent a mechanical vibration of the same frequency (f) is excited in the electric machine during excitation with a radial force (FRP, FRR) in the air gap of the electric machine which has a certain frequency (f), - wherein by appropriate control of the inverter a ramp-up of the electric machine from an initial speed to a final speed is performed, - wherein during the ramp-up of the electric machine a respective voltage curve (U(t)) is applied to the electric machine, - wherein the respective voltage curve (U(t)) is determined such that an associated voltage spectrum (U(f)) contains predetermined portions (ai) of predetermined harmonics of the fundamental frequency in addition to a fundamental vibration at a fundamental frequency, - wherein by means of appropriate sensors (10 to 12) at least one resulting corresponding respective current path (I(t)) and a resulting corresponding mechanical vibration curve (S(t)) are detected, - wherein based on the respective current path (I(t)) a corresponding respective current spectrum (I(f)) is determined and based on the respective current spectrum (I(f)) and the respective voltage spectrum (U(f)) the electrical transfer is determined for at least one of the predetermined harmonics of the fundamental frequency, - wherein based on the respective current spectrum (I(f)) a corresponding respective radial force spectrum (FRR(f), FRP(f)) is determined in the air gap of the electric machine, - wherein based on the detected respective mechanical vibration curve (S(t)) a corresponding respective vibration spectrum (S(f)) is determined and - wherein based on the respective radial force spectrum (FRR(f), FRP(f)) and the respective vibration spectrum (S(f)) for at least one harmonic of the fundamental frequency the at least one mechanical transfer function (GMP, GMR) of the electric machine is determined.