A rotary converter is characterized as a single machine featuring______________?
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Answer: A. one armature and one field
Explanation
A rotary converter is a single machine equipped with a single armature winding and a single field structure. Both the AC supply and the DC output share the exact same physical armature winding wrapped around the rotor. This unified design reduces material costs and physical footprint compared to separate motor-generator sets. Rotary converters perform power conversion within a single magnetic frame to achieve high conversion efficiency. The armature winding acts simultaneously as a synchronous motor winding and a DC generator winding. Armature reaction is largely neutralized because the motoring and generating currents flow in opposite directions.
Substation designers preferred single-machine converters to save floor space and reduce installation complexity. Operating a single armature requires careful mechanical balancing to prevent vibration at high rotational speeds. Electrical engineers analyze armature current distributions to ensure safe thermal loading during operation. Two armatures and one field describes complex multi-unit configurations rather than a standard rotary converter layout. One armature and two fields represents specialized dual-field electrical machines rather than a single converter unit. Stating none of the above is wrong because the single-armature and single-field definition is correct.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
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