Decoupling control and parameter identification of field-orientedinduction motor with saturation

摘要

A new decoupling control and self-commissioning parameteridentification scheme for the PWM-inverter-fed asynchronous motor withsaturation is presented. The modification of the field-oriented controlmodel is considered with respect to rotor-flux-oriented control, whilethe nonlinear magnetizing curve is expressed as a function of themagnetizing current of the main flux path. The control model and themagnetizing curve are bridged through the inherent relationship betweenthe rotor flux and the airgap flux. The complex signal flow graphsindicate that the dynamic structure of AC machines are not changed withmagnetic saturation effects. The nonlinear magnetizing curve isestimated from a transient voltage caused by an ejected constant statord-axis current. Experiment results indicate that the vector control ofinduction motor with saturation can be finely realized with the proposedmodel, on the basis of the recognized magnetizing characteristics