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Which of the following methods of speed control of induction motor can be only used for wound rotor type induction motor? 
  • a)
    Stator frequency control 
  • b)
    Stator voltage and frequency control 
  • c)
    Rotor resistance control 
  • d)
    Stator voltage control
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Which of the following methods of speed control of induction motor can...
Rotor resistance method of speed control:
Where
Rext  = extenal resistance added
  • In this method, some external resistance is added in series with the rotor winding under load conditions.
  • Here voltage kept constant. To maintain load torque is constant so that slip increases.
  • By inserting resistance, the slip of the induction machine increases for constant torque hence the speed reduces.
  • By using this method also speeds below the rated value can be achieved.
  • During the rotor resistance method of speed control of the induction motor, the motor acts as a constant torque variable power drive.
  • Rotor resistance control method of speed control can be only used for wound rotor type induction motor.
Disadvantages:
  • Due to the presence of additional resistance, copper loss increases leads to a reduction in efficiency of the machines.
  • As copper losses increasing heat rise will happen so this method is not suitable for long-duration speed control.
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Which of the following methods of speed control of induction motor can be only used for wound rotor type induction motor?a)Stator frequency controlb)Stator voltage and frequency controlc)Rotor resistance controld)Stator voltage controlCorrect answer is option 'C'. Can you explain this answer?
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