What happens to the diameter when the poles are more than 2?(a) diameter = 2 * diameter * (number of armature teeth embraced by one coil/total number of armature teeth)(b) diameter = 2.32 * diameter * (number of armature teeth embraced by one coil/total number of armature teeth)(c) diameter = 2.32 * diameter * (number of armature teeth embraced by one coil * total number of armature teeth)(d) diameter = 2 * diameter / (number of armature teeth embraced by one coil/total number of armature teeth)I got this question in final exam.My question is taken from Design Preliminaries topic in portion Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

What happens to the diameter when the poles are more than 2?(a) diamet

1.	What happens to the diameter when the poles are more than 2?(a) diameter = 2 * diameter * (number of armature teeth embraced by one coil/total number of armature teeth)(b) diameter = 2.32 * diameter * (number of armature teeth embraced by one coil/total number of armature teeth)(c) diameter = 2.32 * diameter * (number of armature teeth embraced by one coil * total number of armature teeth)(d) diameter = 2 * diameter / (number of armature teeth embraced by one coil/total number of armature teeth)I got this question in final exam.My question is taken from Design Preliminaries topic in portion Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
Answer» The correct option is (B) diameter = 2.32 * diameter * (number of ARMATURE teeth embraced by one coil/total number of armature teeth) EXPLANATION: The diameter is the exact calculated value for 2 pole MOTORS. But when the poles are more than 2, the above formula is made use of to calculate the armature RESISTANCE.

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