Discussion
The maintenance burden of a dc drive arises chiefly from its
Answer: D
Correct answer: commutator and brushes
The commutator is a mechanical rectifier with sliding contacts, so it wears, produces carbon dust, needs periodic brush replacement and undercutting of the mica, and limits the machine’s speed and its use in dirty or explosive atmospheres. The converter and windings need little attention by comparison. This single drawback is the main reason induction and permanent magnet drives have displaced dc drives in most new installations.
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