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This paper presents a new method of simultaneous estimation of speed and rotor resistance of an induction motor, from a sensorless vector control system. The simultaneous estimation of the speed, rotor flux and of rotor resistance is done by using an adaptive estimator, called the COS observer. To ensure the persistent excitation condition, in the vector control system, over the rotor flux reference,...
In this article is presented and analyzed a new control system of the coal flow on the scrapers conveyor in a longwall mining system. The control of the coal flow on the scrapers conveyor, is carried out with the aid of a cascade control system. Electrical drive system of the advance and the cutting mechanism, of the longwall shearer, is done by means of induction motors. The control of speeds and...
The aim of the article is to study the stability of equilibrium points of a sensorless vector control systems with contain in the loop a MRAS observer (Model Reference Adaptive System). In the article are presented and the formulas for controllers tuning, from the composition of the speed vector control system.
This paper presents a new rotor flux and rotor speed observer of induction motor. The new observer is based on an adaptive mechanism. The design of the new observer is done using the notion of Lyapunov stability. The observer is designed to be used within a speed sensorless direct rotor field oriented control of induction motors.
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