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  1. The speed of stator MMF is always more than that of rotor MMF
  2. The speed of stator MMF is always less than that of rotor MMF
  3. The speed of stator MMF is synchronous speed while that of rotor MMF is zero
  4. Rotor and stator MMF are stationary with respect to each other
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1 Answers

Option 4 : Rotor and stator MMF are stationary with respect to each other

Synchronous motor:

  • The rotor rotates with synchronous speed and also rotor MMF and stator MMF rotates with the same speed
  • Rotor and stator MMF are stationary with respect to each other
  • The speed of the rotor of this motor is the same as the rotating magnetic field
  • It is a fixed speed motor because it has only one speed, which is synchronous speed


Induction motor:

The induction motor always runs at a speed that is less than the synchronous speed. I.e. N < Ns

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