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The maximum power in a synchronous machine is obtained when the load angle is

  • The maximum power in a synchronous machine is obtained when the load angle is 90 degrees.
  • The load angle in a synchronous machine is the angle between the voltage phasor of the stator and the rotor.
  • The power developed in a synchronous machine is given by the equation P = EVsin(δ)

where

E is the magnitude of the stator voltage
V is the magnitude of the rotor voltage
δ is the load angle.

The maximum value of sin(δ) is 1, which occurs when the load angle is 90 degrees. Therefore, the maximum power in a synchronous machine is obtained when the load angle is 90 degrees.

It should be noted that operating the synchronous machine at a load angle greater than 90 degrees can lead to instability and loss of synchronism.