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The current loop of a digital drive samples the machine current

  • A.once or twice per switching period
  • B.once per revolution of the machine shaft
  • C.once per cycle of the incoming supply
  • D.continuously, with no sampling at all

Answer: A

Correct answer: once or twice per switching period

The current loop must run fast enough to control the current within the modulation, so it is synchronised to the switching period and samples once or twice within it. Sampling is timed to the middle of a switching state, where the ripple crosses its average, so the sample represents the fundamental without filtering.

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