The variation in excitation of a synchronous motor running with a given load changes ______
The variation in excitation of a synchronous motor running with a given load changes ______
Right Answer is:
Power factor of the motor
SOLUTION
A synchronous motor’s excitation level significantly influences its power factor.
Over-excitation:
- Leading Power Factor: When the motor is over-excited, it draws a leading current from the supply.
- Capacitive Effect: This leading current behaves similar to a capacitor, improving the power factor of the system.
Under-excitation:
- Lagging Power Factor: Conversely, under-excitation leads to a lagging power factor.
- Inductive Effect: The motor behaves like an inductive load, worsening the power factor.
Therefore, by adjusting the excitation level, we can control the power factor of a synchronous motor.