Discussion
A tachogenerator on a dc drive provides
Answer: B
Correct answer: a voltage proportional to the shaft speed
A tachogenerator is a small permanent magnet dc generator on the shaft, and since its emf is \( k\Phi N \) with the flux fixed, its output voltage is directly proportional to speed. It closes the outer speed loop of the drive. Its accuracy depends on low ripple and freedom from temperature drift, which is why precision drives now often use a digital encoder instead.
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