Comparative study of rotor flux estimators sensitivity in the speed sensorless induction motor drive

Abstract

Fax: (48 71) 203467 Email: tok@ptk.iue. pwr.woc. pl. 50-372 WROCLAW, P O I J B Ablracf -Motor drives with speed semsors are expensive and Less reliable. Tberefore there Is n big inteerest in tlnding sohare-based methods of controlling the induethw motors wsing only the s~~~~ current and veltage sensors. In a simple typical estimation metads zbr flux and speed PI& UsEd sirnulation studies and the reap life a~p l i~~~s S~W Q that obseepvers fnst more p o w e~~ and manageable. differences between these two methods. Shdation results present the advantages of &sewers over estimators. For shulation them was Used a model of fldd oriented ched wtjnrntor and Rur observer or estimator for comparison. h g , control Sv&m for iQdU&Oil machine With s w d

Application of the induction motor torque - observer to the control of turbo - machines

“…The voltage model based on equation (5) was implemented in general purpose microprocessor. Experimental results have shown Fig.…”

“…However the stator flux vector cannot be directly measured and has to be estimated. One of the method of solving the problem is to use a reduced order observer based on voltage and current flux model equations [5], [6], [7]. However this requires significant computational power and parameter identification of the induction motor.…”

“…• integration of current model • integration of voltage model (5) It is well known that current equation provide valid results only for low speed of motor [8]. With increasing On the contrary the voltage equation is valid in higher ranges of motor speed which is more suitable in compressor system.…”

Properties of sensorless control systems based on multiscalar models of the induction motor

“…A new kind of speed observer for the induction motor proposed in Krzemiński (1999) is based on the estimation of disturbances instead of extending the Luenberger observer (Orłowska-Kowalska and Wojsznis, 1996). Differential equations of the induction motor considered for construction of the observer are of the following form:…”

Dynamic performance of sensorless induction motor drives with two control systems based on multiscalar models

“…Properties of the sensorless control system based on non-linear feedback depend on exactness of speed estimation and parameter values. The methods of rotor angular velocity estimtion and rotor resistance were proposed in [8], [9], [10], in which calculation from steady state relationship, application of neural and fuzzy systems, sliding mode and observers with additional variable were applied. A different structure suitable for estimation of the rotor speed was proposed in [11], [7].…”