Discussion
Assertion (A): A self-controlled synchronous motor drive cannot lose synchronism.
Reason (R): Its inverter is commutated from measured rotor position.
Select the correct option.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the mechanism. In a self-controlled drive the inverter is switched according to the measured position of the rotor, so the stator field is always placed at the correct angle relative to where the rotor actually is. There is no independent frequency for the rotor to fall out of step with - the machine defines the frequency itself, exactly as a dc machine’s commutator does mechanically. That is why such a drive is often called an electronically commutated machine.
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