We have proposed a current observer-based speed sensorless vector control system taking into account both iron loss and stator resistance identification. The method is constructed in a synchronously rotating reference frame. The effectiveness of the proposed system has been investigated by digital simulation and experimentation. Furthermore important control parameters such as stator resistance, observer gain and filter of speed estimation are studied by comparing the computed result with experimental one.

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We have proposed a current observer-based induction motor speed sensorless vector control system which is composed in a rotating reference frame. The characteristic improvement of this system is discussed by taking into account iron loss, stator resistance identification, current low-pass filter and speed estimation low-pass filter. The stability of the system has been investigated by the trajectories of poles and zeros. The effectiveness of the proposed system has been investigated by digital simulation and experimentation.

We have proposed a current‐observer‐based speed‐sensorless vector control system that is in a rotating reference frame and takes into account iron loss. By deriving a linear model and by computing the trajectories of poles and zeros, the system stability on various parameters such as operating points, observer gain, controller gain, and stator resistance has been investigated. Furthermore, an exact analytical model including PWM control, dead time, and nonideal features of power devices is developed. The characteristic improvement and stability limit of the proposed system are discussed by simulation and experiment. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 180(1): 46–56, 2012; Published online in Wiley Online Library (http://wileyonlinelibrary.com). DOI 10.1002/eej.21301