Real time implementation of a rotor time-constant online estimation scheme

Implementation of AC drives insensitive to parameter variation is a challenge which interests many researchers in the field of high performance drives. In the case of drives controlled by the indirect rotor flux orientated control method (IRFOC), the rotor time-constant (/spl tau//sub r/=R/sub r//L/sub r/) exerts a dominant role in the loss of dynamic performances and its variation results in creation of an undesirable coupling between flux and torque of the machine. This paper presents a new scheme for online estimation of this parameter using measurements of motor accessible variables (voltages, currents and speed). This scheme is tested by simulation in the MATLAB/SIMULINK environment and also real-time implemented on a TMS320C31 digital signal processor. Both simulation and experimental results are presented.

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