Showing papers by "Navid Reza Abjadi published in 2005"
01 Jan 2005
TL;DR: In this paper, an adaptive nonlinear controller is designed for rotor surface permanent magnet synchronous motor (SPMSM) drive based on input-output feedback control (IOFC), and recursive least square (RLS) method.
Abstract: In this paper, based on input-output feedback control (IOFC), and recursive least square (RLS) method, an adaptive nonlinear controller is designed for rotor surface permanent magnet synchronous motor (SPMSM) drive. The RLS estimator online detects the motor electromechanical parameters including the motor iron loss resistance. Moreover, a sliding-mode (SM) observer is developed for online detecting the rotor speed and rotor position. In this control scheme, the torque reference signal is obtained by a conventional speed PI controller. The effectiveness and feasibility of the proposed control approach is tested by simulation. Computer simulation results obtained, show that the errors in the estimated quantities asymptotically converge to zero. The results also show that the drive system is stable and robust against the parameter uncertainties and external load disturbance.
11 citations
28 Nov 2005
TL;DR: In this article, a new adaptive rotor flux observer for speed sensorless induction motor (IM) drives is presented, which provides the rotor speed, stator and rotor resistances estimations simultaneously.
Abstract: This paper presents a new adaptive rotor flux observer for speed sensorless induction motor (IM) drives which provides the rotor speed, stator and rotor resistances estimations simultaneously. The rotor speed and rotor flux controllers are designed based on combination of input-output feedback linearizing, sliding-mode (SM) control and linear quadratic (LQ) feedback control. It is shown that the composite rotor speed and rotor flux controllers in combination with adaptive flux observer guarantee the system stability and robustness against the parameter variations and external load disturbance under system persistency of excitation (PE) condition. The PE condition is satisfied if a low frequency AC signal is superimposed to the rotor reference flux under motor loading operating. The validity of the proposed method is supported by simulation and experimental results
5 citations