The present invention discloses a method for determining a rotor angle of a rotor of an electric machine, having the steps of producing a torque-dependent test signal which depends on the torque of the electric machine and has a higher frequency than a supply signal for the electric machine, controlling the electric machine using the supply signal and the test signal which is superimposed on the supply signal, recording phase currents of the electric machine, and determining the rotor angle of the rotor of the electric machine on the basis of the effects of the test signal on the phase currents. The present invention also discloses an angle determination apparatus and a corresponding control apparatus.