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A cycloconverter-fed synchronous motor drive is used for

  • A.drives that must run from a single-phase supply
  • B.very large low-speed drives
  • C.small servo drives requiring rapid changes of position
  • D.drives operating well above the frequency of the incoming supply

Answer: B

Constructing the output directly from the supply gives good waveforms only well below supply frequency, which suits mine hoists, ball mills and ship propulsion. Above about a third of supply frequency the distortion becomes unacceptable.

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