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What happens if the field winding of the synchronous motor is short-circuited?
First, starts as induction motor then run as a synchronous motor
Not start
Motor will burn out
Run as an induction motor
Run as an induction motor
If the field winding of a synchronous motor is short-circuited, it loses its ability to produce a magnetic field and functions purely based on the rotor's motion. This causes it to operate as an induction motor, relying on slip and the rotor's relative motion to generate torque.
If the field winding of a synchronous motor is short-circuited, it loses its ability to produce a magnetic field and functions purely based on the rotor's motion. This causes it to operate as an induction motor, relying on slip and the rotor's relative motion to generate torque.
When the field winding is short-circuited, the excitation is lost, and the rotor operates with slip speed like an induction motor. The rotor gets induced currents due to the relative motion with the statorтАЩs rotating magnetic field, allowing it to function as an induction motor.
Short-circuiting the field winding eliminates the magnetic field necessary for synchronous operation.
The rotor operates on electromagnetic induction principles similar to induction motors.
Allows the motor to continue running instead of stopping.
Simplifies the operation of the motor under certain fault conditions.
Can lead to overheating and excessive wear if sustained.
Loss of synchronization and efficiency.
Used in applications where variable speed and torque are required.
Common in industries where synchronous motors are prevalent.
Standard design considerations must be taken into account when dealing with synchronous motors.
Option A is incorrect because the motor cannot start normally as an induction motor; it will only operate that way after the field is lost.
D is correct тАФ when the field winding is short-circuited, the synchronous motor effectively runs as an induction motor.
Understand the differences between synchronous and induction motor operational principles, especially in terms of magnetic fields.