The electrical controlled drives are described as controlled systems that contain one or two large time constants and several small time constants, whose influence is replaced by approximately sum time constant. The large time constants are then compensated by a serial correction using a controller, while the sum time constant remains uncompensated. The quality of the control is assessed according to the response of the control loop to step change of the input variable. In the paper, there is used a genetic algorithm to identify the unknown time constants of the controlled system with the electrical drive from the step response characteristic.