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A 3-phase synchronous motor is started by utilising the torque developing in-
- a)the high-speed steam temperature
- 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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A 3-phase synchronous motor is started by utilising the torque develo...
The 3-phase synchronous motor is started by utilising the torque developed in the damper winding on the rotor.
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A 3-phase synchronous motor is started by utilising the torque develo...
Explanation:
The starting of a 3-phase synchronous motor:
When starting a 3-phase synchronous motor, an initial torque must be developed to overcome the inertia of the rotor and start the motor. The torque required for starting is usually developed by utilizing the damper winding on the rotor.
The damper winding on the rotor:
The rotor of a synchronous motor contains a damper winding, which consists of copper bars embedded in the surface of the rotor. The damper winding is short-circuited by end rings at both ends of the rotor. The purpose of the damper winding is to provide starting torque to the motor.
How the damper winding provides starting torque:
When a 3-phase synchronous motor is started, the stator windings are initially energized to create a rotating magnetic field. This rotating magnetic field induces currents in the damper winding on the rotor. These currents produce a magnetic field that interacts with the rotating magnetic field produced by the stator windings.
This interaction between the magnetic fields creates a torque on the rotor, causing it to start rotating. The torque developed by the damper winding is in the opposite direction to the direction of rotation of the rotor. This torque helps overcome the inertia of the rotor and initiates the rotation of the motor.
High-speed steam temperature, low-speed water turbine, and other options:
The high-speed steam temperature and the low-speed water turbine mentioned in options a) and d) are not directly related to the starting of a 3-phase synchronous motor. These options are unrelated to the starting torque requirement of the motor.
Similarly, the damper winding on the stator mentioned in option c) is not a common feature in synchronous motors. The damper winding is typically located on the rotor, not the stator.
Therefore, the correct answer is option b) - the damper winding on the rotor. This winding provides the necessary starting torque to initiate the rotation of the 3-phase synchronous motor.
The starting of a 3-phase synchronous motor:
When starting a 3-phase synchronous motor, an initial torque must be developed to overcome the inertia of the rotor and start the motor. The torque required for starting is usually developed by utilizing the damper winding on the rotor.
The damper winding on the rotor:
The rotor of a synchronous motor contains a damper winding, which consists of copper bars embedded in the surface of the rotor. The damper winding is short-circuited by end rings at both ends of the rotor. The purpose of the damper winding is to provide starting torque to the motor.
How the damper winding provides starting torque:
When a 3-phase synchronous motor is started, the stator windings are initially energized to create a rotating magnetic field. This rotating magnetic field induces currents in the damper winding on the rotor. These currents produce a magnetic field that interacts with the rotating magnetic field produced by the stator windings.
This interaction between the magnetic fields creates a torque on the rotor, causing it to start rotating. The torque developed by the damper winding is in the opposite direction to the direction of rotation of the rotor. This torque helps overcome the inertia of the rotor and initiates the rotation of the motor.
High-speed steam temperature, low-speed water turbine, and other options:
The high-speed steam temperature and the low-speed water turbine mentioned in options a) and d) are not directly related to the starting of a 3-phase synchronous motor. These options are unrelated to the starting torque requirement of the motor.
Similarly, the damper winding on the stator mentioned in option c) is not a common feature in synchronous motors. The damper winding is typically located on the rotor, not the stator.
Therefore, the correct answer is option b) - the damper winding on the rotor. This winding provides the necessary starting torque to initiate the rotation of the 3-phase synchronous motor.
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A 3-phase synchronous motor is started by utilising the torque developing in-a)the high-speed steam temperatureb)the damper winding on the rotorc)the damper winding on the statord)the low-speed water turbineCorrect answer is option 'B'. Can you explain this answer?
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