Discussion
Which of these is NOT a means of starting a synchronous motor?
Answer: D
Correct answer: Rotor resistance control through slip rings
Rotor resistance control belongs to the wound rotor induction machine, where inserting resistance changes the slip at which maximum torque occurs. A synchronous machine’s slip rings carry direct field current, not a variable resistance in an induced-current circuit. The three genuine methods are induction starting on the damper winding, an auxiliary pony motor, and ramping the frequency up from zero with a converter.
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