Discussion
The outer loop of a cascade-controlled dc drive commands
Answer: D
Correct answer: the current reference for the inner loop
A cascade structure has a fast inner current loop within a slower outer speed loop. The speed controller compares the measured speed with the demand and produces a current reference, which the inner loop then enforces by adjusting the firing angle. The arrangement is used because current is proportional to torque and must be limited absolutely: clamping the outer loop’s output caps the current directly, protecting the machine and the converter.
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