Discussion
The efficiency of an induction motor drive is best improved at part load by
Answer: D
Correct answer: reducing the flux to match the load
At part load the torque needed is small, but a machine held at full flux still carries the full magnetising current and the full core loss. Reducing the flux - lowering the voltage in step with the reduced torque demand - brings the iron loss and magnetising current down and can improve part-load efficiency appreciably. Raising the flux does the opposite, and a higher switching frequency merely increases the inverter loss.
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