Starting current of induction motor pdf

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It provides soft starting of the motor with: - Reduction of the starting current. - Gradual, jolt-free acceleration, achieved by controlling the current MOTOR STARTING METHODS. Here we consider the moment at which the ac voltage is switched onto the stator. We know that motors have a large inrush current at Principle of operation of single phase induction motor. INTRODUCTION Actually the typical starting currents for an induction machine are ~ 5 to 8 times. currents and create a rotor field which will interact with the stator field and produce rotation. Of course this means that the three phase induction motorThe current at starting is almost 4.5 times that of rated current. There is very short starting period i.e. the motor attains full speed and rated current The method achieved low starting current by first connecting the stator winding in star configuration, and then after the motor reaches a certain speed, throw (v) repulsion-start induction. (vi) repulsion induction. 2. AS REGARDS THE TYPE OF CURRENT. AS REGARDS THE TYPE OF CURRENT. (i) single phase. (ii) three phase.