In the synchronous motor, the breakdown torque is
Right Answer is:
Directly proportional to applied voltage
Breakdown torque is the maximum torque of the motor, which is produced at full rated voltage and frequency.
Power in the synchronous motor is given as
P = 2NT/60 V2
From the above equation, it is clear that torque T ∝ P.
The pull-out torque with excitation is supplied with a constant voltage source which varies directly with motor terminal voltage. Therefore as power varies as applied voltage V, the torque of a synchronous motor is also varies as applied voltage V.