What does the copper factor in PMDC motors represent?(a) it represents the armature circular area for conductors(b) it represents the field circular area for conductors(c) it represents the fraction of the armature circular area for conductors(d) it represents the fraction of the field circular area for conductorsThis question was posed to me in an interview for job.Query is from Design Preliminaries topic in chapter Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

What does the copper factor in PMDC motors represent?(a) it represents

1.	What does the copper factor in PMDC motors represent?(a) it represents the armature circular area for conductors(b) it represents the field circular area for conductors(c) it represents the fraction of the armature circular area for conductors(d) it represents the fraction of the field circular area for conductorsThis question was posed to me in an interview for job.Query is from Design Preliminaries topic in chapter Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
Answer» Correct choice is (c) it represents the FRACTION of the armature circular area for conductors To explain I would say: The COPPER factor represents the fraction of the armature circular area for conductors. It is REPRESENTED by the LETTER K.

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