Discussion
A synchronous motor fed from a variable-frequency converter can be started by
Answer: B
Correct answer: raising the frequency slowly from zero
With a variable-frequency converter the synchronous speed can be started at zero and increased gradually, so the rotor field never has to catch a field that is already rotating quickly - it accelerates in step from rest. The voltage is raised with the frequency to hold the flux constant. This is the standard start for a converter-fed drive and removes the need for a damper winding to act as a starting cage.
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