What is the range of the copper factor in PMDC motors?(a) 0.1-0.3(b) 0.1-0.2(c) 0.1-0.4(d) 0.2-0.4This question was posed to me by my college professor while I was bunking the class.This intriguing question comes from Design Preliminaries topic in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

What is the range of the copper factor in PMDC motors?(a) 0.1-0.3(b) 0

1.	What is the range of the copper factor in PMDC motors?(a) 0.1-0.3(b) 0.1-0.2(c) 0.1-0.4(d) 0.2-0.4This question was posed to me by my college professor while I was bunking the class.This intriguing question comes from Design Preliminaries topic in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
Answer» The correct CHOICE is (B) 0.1-0.2 The explanation is: The copper factor represents the fraction of the armature circular area for CONDUCTORS. The RANGE of the copper factor is between 0.1-0.2.

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