INDUCTION-MOTOR DYNAMIC AND STATIC INDUCTANCE IDENTIFICATION USING A BROAD-BAND EXCITATION TECHNIQUE

The performance of indirect vector control depends upon accurate predi ction of the motor slip angular frequency (omega(s)) for the demand to rque. The required slip gain depends upon the rotor time constant of t he motor (T-r). This value varies significantly over the operating tem perature range and saturation level of a typical motor. This variation , if not compensated for, results in a significant degradation in torq ue production from a vector control system. The saturation effect can be compensated by an adaptive flux model if precise knowledge of the i nduction motor magnetizing curve is available. The aim of this paper i s to present the application of an advanced system identification meth odology enabling the offline estimation of the magnetizing curve (dyna mic and static inductance) of induction motors.