Exam Question
(a) Explain Distribution factor and Pitch factor for Alternator windings.
(b) A 3phase, 4 pole 24 slot alternator has its armature coils short pitched by one slot. Find the distribution factor and pitch factor.
Class 2 (2nd Engineer)
MET
📅 Jan 2019
Reference Answer
(a) Distribution Factor (Kd):
The distribution factor is a measure of how the EMF induced in a distributed winding compares to the EMF induced if the winding were concentrated in one slot. It is given by the formula:
$$K_{d}=\frac{EMF\:induced\:in\:distributed\:windings}{EMF\:induced\:in\:concentrated\:windings}$$
Concentrated Winding : All the coils of a phase under one pole are grouped in a single slot.
The distribution factor is a measure of how the EMF induced in a distributed winding compares to the EMF induced if the winding were concentrated in one slot. It is given by the formula:
$$K_{d}=\frac{EMF\:induced\:in\:distributed\:windings}{EMF\:induced\:in\:concentrated\:windings}$$
Concentrated Winding : All the coils of a phase under one pole are grouped in a single slot.
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