Discussion
A load commutated inverter drive needs assistance at low speed because
Answer: A
Correct answer: the machine’s emf is then too small to commutate the thyristors
A load commutated inverter relies on the motor’s own back emf to reverse-bias the outgoing thyristor and turn it off, and that emf is proportional to speed. Below roughly ten per cent of rated speed it is too small to do the job, so the drive starts in a pulsed dc link mode, interrupting the link current to force commutation until the machine is fast enough to commutate naturally.
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