a method for estimating a torque of a three - phase motor for a vehicle includes measuring a respective current strength in at least two of three phase lines , wherein the three - phase motor is supplied with power by a converter , and wherein the three phase lines lead from the converter to the three - phase motor of the vehicle , measuring a respective voltage at each of the three phase lines , determining a rotating field frequency as a function of the measured current strengths or the measured voltages ; and determining an estimated value for the torque as a function of the measured current strengths , the measured voltages and the determined rotating field frequency .