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An adaptive sliding-mode observer is proposed in this paper to update the rotor resistance in indirect field oriented controlled induction motor drives. Although the observer is implemented in stationary reference frame, the design and theory analysis are made in the rotor-field oriented reference frame. Through coordinate transformation, the essence of the sliding- mode manifold and the theory foundation...
This paper describes the application of ANNs observer based on the extended Kalman filter (EKF) for rotor resistance, Mutual inductance and rotor speed estimation of an induction motor, in order to overcome the constraint of adjustment of the covariance matrices and to improve the estimate of these last three parameters. It is an observer for non-linear systems; it is applied to the indirect field...
The paper deals with rotor resistance identification of induction motor considering core loss. The rotor resistance can not be measured directly and easily varies with the increasing temperature. The problem of its identification bases on equivalent circuit. In the equivalent circuit, the equivalent resistance of core loss is in parallel with mutual inductance of induction motor in two-phase stationary...
This paper analyzes a high-frequency (HF) voltage-injection-based rotor winding temperature estimation method for current-regulated squirrel-cage induction motors (IMs). We develop a theoretical HF model of the rotor bar and then first provide an analysis of relevant HF model-based estimation aspects, such as the dependence of the rotor leakage inductance on the temperature and the relationship between...
The paper deals with methods and algorithms for the estimation of the induction motor equivalent circuit parameters starting from the geometrical and electrical data generally available after an electromagnetic design. The main aim of the paper is to help the readers to pass from the theoretical analysis to numerical code suitable to be included in own design software. For this reason, the step-by-step...
A new approach employing the circuit analysis theory instead of electromagnetic field theory is presented to calculate the rotor resistances and inductances of single-phase induction motors. The resistance and inductance parameters are obtained at positive sequence and negative sequence frequencies, respectively, with skin effect consideration. The rotor bar is divided into many thin-layers with their...
This paper presents an improved stator flux orientated (SFO) control strategy of induction motors. Based on coordinate transformation and stator flux orientation, a mathematical model of induction motor is derived. In this new system, the stator flux linkage is directly controlled by the d-axis component of stator voltage and in the speed control channel, the output of current controller is regarded...
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