Discussion
An ac tachogenerator, or drag cup generator, produces an output that is
Answer: A
Correct answer: proportional to speed in amplitude and fixed in frequency
The drag cup generator has a reference winding excited at a fixed frequency and an output winding at right angles to it. Rotation of the thin non-magnetic cup produces an output at that same frequency whose amplitude is proportional to speed and whose phase reverses with direction. Having no commutator, it gives a much cleaner signal at low speeds.
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