Procedure of consecutively no-load tests for the identification of control relevant equivalent circuit parameter of squirrel cage motors

The realization of a vector control for the operation of induction motors often takes advantage of ordinary equivalent circuit models. These are usually based on a set of lumped resistive and inductive parameters for a substituted characterization of the real motor design. Some simplified models are consisting of a reduced number of system parameters and allow a very basically identification procedure by no-load tests in the lab. Fictive identification tests could fortunately be carried out by the finite element method during the development and optimization process, without the necessity of cost-extensive prototyping. Such numerically obtained equivalent parameters of projected motor designs are used within an even more complex simulation of the complete controlled drive system. Deviations between the numerically predicted controlled system behavior and the required features could be found and eliminated in advance.