In synchronous motor, the damper winding is generally used to
A. reduce the eddy currents.
B. reduce noise level only.
C. provide starting torque only.
D. prevent hunting and provide the starting torque.
Answer: C
Share your understanding of this question with the correct explanation.
The answer is D. prevent hunting and provide the starting torque.
Damper windings are used in synchronous motors to provide starting torque and to prevent hunting. Starting torque is the torque that is required to start the motor rotating. Hunting is a phenomenon that occurs when the motor is running at a speed that is slightly different from its synchronous speed. This can cause the motor to oscillate between two speeds, which can damage the motor.
Damper windings are short-circuited windings that are placed on the rotor of the motor. When the motor is starting up, the damper windings create a rotating magnetic field that helps to start the rotor rotating. Once the rotor reaches synchronous speed, the damper windings do not create any torque. However, they are still there to help prevent hunting.
When the motor is running at a speed that is slightly different from its synchronous speed, the damper windings create a torque that helps to bring the motor back to its synchronous speed. This helps to prevent hunting.
Here are some additional details about damper windings:
Damper windings are an important part of synchronous motors. They help to start the motor and to prevent hunting.