Abstract
This paper focuses on a stator-core and rotor-core losses compensation technique devoted to a direct field-oriented control system of an induction motor incorporating parameter identification. The fundamental control algorithm is based on direct field orientation, which essentially requires rotor flux estimation using several motor parameters and detection of line currents and a rotor position. In order to suppress the flux estimation error caused by parameter mismatches, the magnetizing inductance and the rotor resistance are identified insensitively to the stator resistance by utilizing instantaneous reactive power. However, due to a model mismatch associated with the stator-core loss and rotor-core loss, neither the field orientation nor the parameter identification can be achieved as is expected, which mainly results in degradation of flux and torque control accuracy. This paper describes characteristics of the motor parameters precisely measured under various operating conditions, the influence of both stator-core loss resistance and rotor-core loss resistance on the field orientation and the parameter identification, and a compensation technique to obtain higher controllability than conventional field-oriented control techniques. Effectiveness of the proposed technique has been examined through experimental tests as well as computer simulations, and the absolute accuracy and linearity of the motor torque has been improved as a result.
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