As shown in the illustrated synchroconverter for an AC synchronous propulsion motor, what statement is true concerning operational characteristics? See illustration EL-0155.
• In a synchronous motor, mechanical speed is directly tied to the supply frequency (Ns = 120f/P). • In most AC drive systems, current is closely related to torque, while frequency/voltage is related to speed. • In the EL-0155 diagram, the left side is labeled controlled current source (rectifier) and the right side is labeled frequency controller (inverter).
• Look at the labels under each section of the converter. What does the rectifier section say it is controlling, and what does the inverter section say it is controlling? • For a synchronous motor, if you want to change speed, which electrical quantity must you vary: current or frequency? • If torque is mainly proportional to armature/stator current, which part of the converter primarily sets that current?
• Verify which section (rectifier or inverter) is associated with the DC link current feeding the motor. • Confirm that synchronous speed depends on frequency, not on current, using Ns = 120f/P. • Match each multiple‑choice statement to the diagram’s functional labels: controlled current source vs frequency controller.
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