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In a synchronous motor which loss does not vary with the load?
Stator Cu losses
Rotor Cu losses
Windage losses
None of these
None of these
The correct answer is D (None of these) ┬╖ In a synchronous motor, all losses typically vary with load, including stator copper losses, rotor copper losses, and windage losses.
The correct answer is D (None of these) ┬╖ In a synchronous motor, all losses typically vary with load, including stator copper losses, rotor copper losses, and windage losses.
PlossтАЛ=I2R тАФ represents the copper losses.
PwindageтАЛ=kV3 тАФ represents the windage losses proportional to the cube of speed.
Synchronous motors operate at a constant speed dictated by the supply frequency ┬╖ The losses within these motors depend on the current flowing through the windings, which varies with the load ┬╖ Hence, both the stator and rotor copper losses change with load, while windage losses increase as speed increases.
Copper losses occur due to resistance in the windings and depend on the load current.
Windage losses arise from the motion of the rotor in the air, proportional to the speed of the motor.
Synchronous motors have high efficiency at full load.
They can operate at leading, lagging, and unity power factors.
They require an external starting mechanism.
Synchronous motors are more complex in construction.
Used in industrial applications requiring precise speed control.
Applicable in synchronous condensers for power factor correction.
Synchronous motors can operate at a range of loads but maintain synchronous speed irrespective of the load.
Option A: Stator Cu losses increase with load; Option B: Rotor Cu losses also increase with load; Option C: Windage losses increase with speed.
D is correct тАФ none of the losses remain constant as load varies.
Remember that in synchronous motors, losses can inform the efficiency and operational stability of the system, crucial for exam scenarios.