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  1. Star delta starting
  2. Resistance in stator circuit
  3. Auto transformer starting
  4. Resistance in rotor circuit
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1 Answers

Option 4 : Resistance in rotor circuit

In squirrel cage induction motor, the rotor terminals are short-circuited. Hence we cannot add external resistance into the rotor circuit. So we cannot use is this method for starting.

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The star-delta starter method of starting three-phase induction motors is very common and widely used among all the methods. In this method, the motor runs at delta connected stator windings. It is also used for small motors up to 5 kW rating.

The direct on line (DOL) starter method of an induction motor is simple and economical. In this method, the starter is connected directly to supply voltage. By this method, small motors up to 5 kW rating are started to avoid the supply voltage fluctuation.

The Autotransformer is used in both the type of the connections, i.e., either star connected or delta connected. The autotransformer is used to limit the starting current of the induction motor. This method is used for the high rating of squirrel cage induction motors. So, this method is most suitable for a 20 kW squirrel cage induction motor.

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