On-line parameter estimation for indirect field oriented control of induction machine based on steady state voltage model

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.