Electrical Engineering ⇒ Topic : Losses and Efficiency
Losses and Efficiency :
Losses The following losses occur in an alternator :
Copper losses These losses occur in the armature winding and in the field coils.
Core loss The core loss consists of eddy-current and hysteresis loss in the pole faces, teeth and stator core due to the flux resulting from the combined rotor and armature fields.
Friction and windage loss This loss is due to the bearing and brush friction and to the power required to circulate the cooling air.
Load loss This is due to the armature leakage flux which causes eddy-currents and hysteresis in the iron surrounding the armature conductors.
Efficiency The efficiency of an alternator is calculated as follows
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