interpoles is widely use to improve commutation
place between main poles fitted to yoke
to neutralize armature mmf in commutating zone
to produce some flux in commutating zone
Torque in d.c motor = k* φ * Ia
In series motor φ α Ia
N α 1/φ
N α 1/T
all day efficiency is ratio of energy output to the energy input taken over 24 hour period.
design distribution transformer for max. efficiency occurring at the avarage output power.
performance of distribution transformer represent by all day efficiency.