It is usual find single-phase induction motor (SPIM) in several house, office, shopping, farm, and industry uses,which are become each time more refined and requiring variable speed drives. In view of the low cost of this machine, the recognition of sensorless speed control is themore reasonable option for SPIM drives. This paper presents a tender for sensorless variable speed SPIM drive based on direct rotor field orientation techniques. An spectator based on two independent linear close-loop control systems provides the assessment of the rotor flux and speed from the measurements of the stator currents and voltages. These estimates are used by close-loop system forspeed control and flux regulation in order togovern the voltages to be applied in the main and auxiliary windings by a three-leg VSI inverter. None variable transformation is used in this tender in order to eliminate the asymmetry of the stator windings of the SPIM. The performance of the proposed sensorless speed control is satisfactorily verified from computer simulations.
SENSOR LESS SPEED CONTROL OF ACTIVE CURRENT INDUCTION MOTOR USING MICROCONTROLLER