Discussion
Which of the following method can NOT be used for the speed control of squirrel cage induction motor?
Answer: D
Rotor resistance control cannot be used for the speed control of a squirrel cage induction motor. The bars of a cage rotor are short-circuited inside the rotor, so no external resistance can be put in the rotor circuit. A wound rotor has slip rings through which resistance can be added.
Stator voltage control, stator frequency control and the control of the stator current can all be applied to a cage motor, since they act on the stator. So the fourth option is the answer.
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