Discussion
Match the feedback device with what it reports.
1. Tachogenerator 2. Incremental encoder 3. Absolute encoder
P. Position without homing Q. A voltage proportional to speed R. Pulses giving relative position
Answer: A
Correct answer: 1-Q, 2-R, 3-P
Three feedback devices reporting three different things. A tachogenerator produces a voltage proportional to speed, so it feeds a speed loop directly. An incremental encoder produces pulses giving relative position, which must be counted from a reference. And an absolute encoder reports its position outright, with no homing needed.
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