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The torque of an induction motor is proportional to

  • A.the rotor copper loss divided by the rotor speed of the machine
  • B.the input power divided by the actual rotor speed
  • C.the air gap power divided by the synchronous speed
  • D.the mechanical output power divided by the synchronous speed of the field

Answer: C

Torque is the air gap power referred to synchronous speed, which is why air gap power is sometimes called torque in synchronous watts. Using the mechanical power and the rotor speed gives the same torque, since both are reduced by the same factor.

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