Discussion
A synchronous motor drive operated in true synchronous mode
Answer: B
Correct answer: takes an open-loop frequency reference
In true synchronous mode the inverter frequency is commanded independently, and the rotor is expected to follow, exactly as if the machine were connected to a supply of that frequency. The arrangement is simple but retains the fixed-supply weakness: a sudden load change can pull the rotor out of step. Self-controlled mode removes that by measuring rotor position and commutating the inverter from it, so the machine cannot lose synchronism.
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