Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  none of these.
  balance the rotor dynamically.
  facilitate cooling of rotor.
  eliminate noise.

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Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is

 3 times maximum value of flux due to any phase
 1/2 times maximum value of flux due to any phase
 equal to φm, where φm is the maximum flux due to any phase
 3/2 times maximum value of flux due to any phase

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