Indirect vector control of induction motors drive systems considering the iron loss resistance

The paper deals with a modality to perform indirect vector control while considering the iron loss resistance. The control algorithm was conceived starting from the induction motor's mathematic model. Its implementation improves the drive system efficiency. Two cases are presented. In both of them the iron loss resistance is considered, but the first one considers the same value for the rotor time constant, whilst for the second one the rotor time constant is modified. A comparative analysis is made for the mechanic torque, when the speed is lower than the rated value. Through this control algorithm a reduction of the difference between estimated and measured torques while considering the iron loss resistance and a variation of the rotor time constant were realized. dSPACE DS 1104 was used to perform the experimental tests. In the end, tests were performed considering the variation of the magnetizing inductance in the range of speeds higher than the rated one.