Question
Explain the purpose of interpoles and state
their magnetic polarity relative to the main poles of both generators and
_ motors.
A
200V, long-shunt compound-wound generator has a full-load output of 20kW. The
various resistances are as follows; armature (including brush contact) 0.15Ω, series Held 0.025Ω, interpole
field 0.028Ω, shunt field (including
the field-regulator resistance) 1150. The iron losses at full load are 780W,
and the friction and windage losses 59OW. Calculate
the efficiency at full load.
