While a 2-phase ac servomotor is in operation, if the voltage across the control field winding becomes zero, then the motor has a tendency to run as a single phase induction motor.
To prevent this
A. rotor having high mass moment of inertia is used for such a motor
B. drag cup type of light rotor and high resistance is preferred.
C. a low resistance is used.
D. the number of turns in the control field winding used is less than the main reference winding.
Show Answer
Answer: B
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