Electrical Machines
The stator frame in an induction motor is used to

  provide return path for the flux.
  hold armature stamping in position.
  protect the whole machine.
  ventilate the armature.

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Electrical Machines
An ideal synchronous motor has no starting torque because

  relative velocity between stator and rotor mmf’s is not zero.
 rotor is made up of salient poles.
 relative velocity between the stator and rotor mmf’s is zero.
 rotor winding is highly reactive.

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