Operation of an indirect rotor flux oriented induction machine in the field weakening region is usually realized by varying the rotor flux reference in inverse proportion to the speed of rotation. In order to provide the correct stator d-axis current reference at all speeds, it is necessary to incorporate the inverse magnetizing curve of the machine in the controller. The paper proposes an experimental method for identifying the inverse magnetizing curve, specifically developed for the type of vector controlled drives described. The method utilizes the same indirect vector controller and PWM inverter that are used in subsequent normal operation of the drive. It requires that the machine can run under no-load conditions and that the fundamental component of the stator voltage can be measured. The simplicity and accuracy of the method make it well suited for use during commissioning of the drive. The method is verified by extensive experimentation.
A novel induction motor model, that fully accounts for both the fundamental iron loss and main flux saturation, is derived. The model is then applied to the design of a modified rotor flux oriented control scheme. A rotor flux estimator and a rotor resistance identifier are both developed using the novel model, so that simultaneous compensation of main flux saturation, iron loss and rotor resistance variation is achieved.
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