A wide-speed-range sensorless control for an IPMSM is deeply studied in this paper, which combines the high-frequency injection (HFI) method and sliding-mode observer (SMO) method. At low-speed range, a rotating voltage signal injected into IPMSM; rotor position can be estimated by HFI based on saliency of IPMSM. high-speed SMO extended back electromotive force (EMF) utilized to estimate positi...

It is impossible to install or apply position sensors appropriately in some special applications of PMSM. Sensorless PMSM control an appropriate choice solve problems the necessary acquire estimated precisely and avoid chattering phenomenon for sensorless control. This paper proposes algorithm estimating with sliding mode observer (SMO) based on sigmoid function, a sufficient condition that lea...

In this paper, a sensorless speed control for linear induction motors (LIMs) is developed based on fuzzy observer design. First, the LIMs is represented by a Takagi-Sugeno (T-S) fuzzy model. Next, the fuzzy observer is constructed to estimate the immeasurable states of mover speed and secondary flux, where the observer gains are obtained by solving a set of linear matrix inequalities (LMIs). To...