Method for magnetizing curve identification in vector controlled induction machines

If an adaptive induction machine flux model is to be used for rotor flux space vector estimation in a vector controlled drive, the magnetizing curve of the machine has to be known. A desirable feature of the magnetizing curve identification algorithm is that the procedure should constitute a separate routine which can be executed during commissioning of the drive. An experimental procedure, which utilizes current regulated PWM inverter aimed for continuous operation of a vector controlled induction machine, is developed for this purpose. It relies on indirect vector control technique and makes use of a PC implemented indirect vector controller. Appropriate processing of data, obtained during measurements, enables identification of the magnetizing curve. To illustrate the accuracy of the algorithm, results of identification are verified by an existing method aimed for rotor time constant tuning in indirect vector controller.