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Synchronous wattage of an induction motor means
1. Stator input in watts
2. Rotor input in watts
3. Combined stator and rotor input in watts
4. Shaft output in watts

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Correct Answer - Option 2 : Rotor input in watts

Torque developed:

  • The developed Torque or Induced Torque Equation in a machine is defined as the Torque generated by the electric to mechanical power conversion.
  • The torque is also known as Electromagnetic Torque.

The developed torque equation is given as

Td = mechanical power developed / mechanical angular velocity developed

Td = Pm / ωr 

Since, Pm = (1 - s) Pg, ωr = (1 - s) ωs

⇒ Td = (1 - s) Pg / (1 - s) ωs

⇒ Td = Pg / ωs

  • The above equation expresses the developed torque directly in terms of the air gap power
  • Pg and the synchronous speed ωs. Since ωs is constant and independent of the load conditions.
  • If the value of the Pg is known then, the developed torque can be found directly.
  • The air gap power Pg is also called as the Torque in Synchronous Watts.

Synchronous Watt is the torque that develops the power of 1 Watt when the machine is running at synchronous speed.

In an induction motor, synchronous wattage indicates the rotor input in the units of watts.

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