Algorithm for IM Optimal Flux Determination Respecting Nonlinearities and Thermal Influences

The paper deals with calculation of the optimal flux linkage of induction motor, which corresponds to the maximal motor efficiency at the specified combination of torque and speed. The proposed algorithm respects the non-linearity of the motor parameters but also the change of the stator and rotor winding temperatures in dependence on the load of the motor. There are described the procedures for the experimental determination of the nonlinearities of motor parameters.