Electrical drives with asynchronous motors controlled by field orientation are the most widely used due to advantages in terms of dynamic behavior and of possibility to adjust speed in wide range.The drive can be considered as a nonlinear process, so that the parameters of the mathematical model obtained by linearization of its, change from an operating point to another. This requires adding an extra adaptation loop in order to update the speed PI controller parameters.
The paper presents the achievement of an adaptive system, developed by so-called gain scheduling strategy, which in adjustment functions of speed controller parameters used as input variable motor speed even. Gain scheduling functions are obtained for four different intervals covering the full range of speeds slower than the nominal. Matlab Simulink simulations show the validity of the designed system.