Direct On-line Starting:

In this method, the three-phase stator is directly switched "ON" to the three-phase supply mains. The motor takes starting current of 5 to 6 times its full load current based upon the design of motor. Such an initial causes voltage drops in the power supply lines feeding the induction motor.

Stator Resistor Starting

In this method, we connect a resistor or a reactor in between motor terminals and the supply. As we begin the motor, some voltage drop occurs across the beginning resistor or reactor and only a fraction of the supply voltage seem across the stator terminals. Therefore, it decreases the starting current. As the motor speeds up the resistor/reactor is cut out in steps and at last short circuited.