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The synchronous motor connected to an infinite bus takes power at a lag p.f. If its excitation is increased

  • The synchronous motor connected to an infinite bus takes power at a lag p.f. If its excitation is increased then Power factor Increase.
  • In a synchronous motor connected to an infinite bus, the power factor depends on the excitation of the rotor.
  • When the excitation of the rotor is increased, the power factor of the motor will also increase.
  • The excitation of the rotor affects the angle between the voltage and current of the motor.
  • When the rotor is under-excited, the angle between the voltage and current is large, which results in a lagging power factor.
  • When the rotor is over-excited, the angle between the voltage and current decreases, resulting in an improved power factor.
  • By increasing the excitation of the synchronous motor, the power factor can be improved from a lagging power factor towards a unity power factor or even leading power factor, depending on the level of excitation.