Indirect field oriented control of induction machine has been widely applied in industry applications. This control scheme is relatively simple but strongly relies on the parameters of the machine, such as the rotor time constant and mutual inductance. The parameter deviation could result in the decrease of control performance, and this is vital especially for the torque control mode. In this paper, the effects of the deviation of rotor time constant and mutual inductance on the rotor flux and the electromagnetic torque are discussed in details. A new algorithm of on-line parameter estimation using the steady state voltage model based rotor flux observation is proposed, in which the rotor time constant and mutual inductance are corrected by the error of phase angle and magnitude of the observed rotor flux. The simulation and experimental results validates the effectiveness in improving torque control of the new method. Keywords-induction machine; indirect field oriented control; on-line parameter estimation; steady state voltage model;I.

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In this paper the relationship between induction motor port impedance and internal parameters including stator inductance, rotor inductance, magnetizing inductance and rotor resistance is deduced based on T-model equivalent circuit. The relationship explains the reason that every internal parameter can not be uniquely identified with the port impedance, and rotor speed or frequency. The minimum parameters set of T-model equivalent circuit is proposed based on this deduce. Two methods of calculating the minimum parameters set applied for rotation and lockedrotor conditions respectively are proposed. In order to analyze the influence of iron loss on the motor parameters, a simplified T-model equivalent circuit, suitable for low frequency environment, is presented. The effectiveness of the model and the two methods proposed are verified with the experimental results.

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