Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines
Pitch Factor (Kp) of an Alternator
Synchronous Machines
The armature winding of an alternator is distributed over the entire armature.
PITCH
FACTOR (Kp) OF AN ALTERNATOR
The armature winding of
an alternator is distributed over the entire armature. The distributed winding
produces nearly a sine wave form and the heating is more uniform. Likewise, the
coils of armature winding are not full pitched, ie the two sides of a coil are not
at corresponding points under adjacent poles.
Pitch factor Kp = (emf with short ‒ pitch coil) / (emf with full ‒ pitch coil)
Kp = cos α/2
α = chording angle
Pole pitch is the
distance between the centre lines of adjacent N and S poles measured along the
circumference of armature surface. When the two sides of a coil are full pole‒pitch
apart, it is known as full‒pitched coil. The emf in the coil sides of a full‒pitched
coil are in phase.
In practice, coil pitch
is less than pole‒pitch and hence emf in the coil sides have a phase
difference. The resultant emf in the coil will be less than that of full‒pitched
coil.
Therefore, For full‒pitch
coil, Kp=1 while
for short‒pitch coil, Kp<1.
Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines : Tag: Basic Engineering : Synchronous Machines - Pitch Factor (Kp) of an Alternator
Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines
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