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A 3-phase synchronous motor is started by utilizing the torque developed in
- a)the high-speed steam-turbine.
- b)the damper winding on the rotor.
- c)the damper winding on the stator.
- d)the low-speed water-turbine.
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
A 3-phase synchronous motor is started by utilizing the torque develop...
Damper bars are placed inside rotor to develop starting torque in 3 phase synchronous motor.
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A 3-phase synchronous motor is started by utilizing the torque develop...
Understanding Synchronous Motor Starting
Starting a 3-phase synchronous motor can be challenging due to its nature of requiring synchronous speed to develop torque. The preferred method utilized is through the damper winding on the rotor.
What is a Damper Winding?
- Damper windings are additional windings placed on the rotor of synchronous motors.
- They consist of conductive bars, similar to those in an induction motor.
Function of Damper Windings
- Torque Development: When the motor starts, the rotor is initially stationary. The damper winding allows the rotor to experience induced currents due to slip between the rotor and the rotating magnetic field of the stator.
- Starting Torque: The induced currents in the damper winding create a magnetic field that interacts with the stator field, producing torque. This helps the motor reach near synchronous speed.
Advantages of Using Damper Windings
- Smooth Starting: The damper winding provides a smooth transition to synchronous speed without requiring additional starting mechanisms.
- Protection: It also protects the motor from excessive torque during abnormal operating conditions.
Conclusion
In summary, the correct choice is option 'B' because the damper winding on the rotor plays a critical role in developing the necessary starting torque for a 3-phase synchronous motor, enabling it to reach synchronous speed effectively.
Starting a 3-phase synchronous motor can be challenging due to its nature of requiring synchronous speed to develop torque. The preferred method utilized is through the damper winding on the rotor.
What is a Damper Winding?
- Damper windings are additional windings placed on the rotor of synchronous motors.
- They consist of conductive bars, similar to those in an induction motor.
Function of Damper Windings
- Torque Development: When the motor starts, the rotor is initially stationary. The damper winding allows the rotor to experience induced currents due to slip between the rotor and the rotating magnetic field of the stator.
- Starting Torque: The induced currents in the damper winding create a magnetic field that interacts with the stator field, producing torque. This helps the motor reach near synchronous speed.
Advantages of Using Damper Windings
- Smooth Starting: The damper winding provides a smooth transition to synchronous speed without requiring additional starting mechanisms.
- Protection: It also protects the motor from excessive torque during abnormal operating conditions.
Conclusion
In summary, the correct choice is option 'B' because the damper winding on the rotor plays a critical role in developing the necessary starting torque for a 3-phase synchronous motor, enabling it to reach synchronous speed effectively.
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A 3-phase synchronous motor is started by utilizing the torque developed ina)the high-speed steam-turbine.b)the damper winding on the rotor.c)the damper winding on the stator.d)the low-speed water-turbine.Correct answer is option 'B'. Can you explain this answer?
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