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Rotor bars of a cage machine are skewed relative to the shaft in order to

  • A.improve the mechanical balance of the rotor at speed
  • B.reduce the flux the stator has to produce
  • C.reduce magnetic noise and the locking effect of slot harmonics
  • D.increase the resistance of the rotor circuit deliberately for the sake of starting torque

Answer: C

A skew averages the interaction between stator and rotor slots over the length of the machine, which removes the tendency to lock at particular positions and quietens the machine. It slightly reduces the useful torque.

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