Shaft Sensorless Speed Control of Induction Motor Drive

In this paper, the test voltage injection coupled with tracking of magnetic saliencies created by saturation and rotor slotting was used for shaft sensorless speed control of induction motor drives at zero and low speed. Method does not require additional wire connections and is usable for star or delta machine connection. The paper is proposing low memory method of elimination saturation effect from position signals, which are obtained from sensors of line current derivations. Experimental results are presented shoving tracking of rotor speed and position, signal processing with proposed method and shaft sensorless speed control as well