The starting time of the three – phase asynchronous motors can be determined using the equation of the movement of the electric drive putting down into this equation the mechanical characteristics of the mechanism and motor. The mechanical characteristics of the motor often are expressed by the Kloss formula, but this formula can't be used for the up to date asynchronous motors, wich have very different mechanical characteristics. The analysis of the method letting to express the mechanical characteristics of the motor as the sum of two components: one according Kloss formula, another – as a power function, are carried out. Using this expession of the mechanical characteristics of the induction motor and the equation of the movement of the drive, the method for determination of the starting time is developed.