If rotor of Induction motor is rotating at synchronous speed the torque will be | Electrical Machines MCQ 48

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If Rotor of Induction motor is rotating at synchronous speed the torque will be:

  1. Zero
  2. Low
  3. High
  4. Infinite

Correct answer: 1. Zero

Explanation: When the rotor of induction motor turns at synchronous speed the rotor bars would be stationary relative to the magnetic field. Inturn there would be no induced voltage. If induced voltage is zero then there would be no rotor current as well as no rotor magnetic field. Without rotors magnetic field the induced torque would be zero.

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