Page 769 - Basic Electrical Engineering
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Pitch factor,
K = cosβ / 2 (10.4)
p
The value of the pitch factor is somewhat less than unity. For example, if
the coil is short pitched by an angle say 30°, then β = 30°:
Example 10.1 Calculate the distribution factor for a single-layer 36-slot
two-pole three-phase stator winding of a synchronous machine.
Solution:
Slots are made distributed throughout the whole of stator periphery. The
angle between two slots, i.e., slot angle α is calculated as
Number of slots per pole per phase, i.e., m is calculated as
Example 10.2 The stator winding of a three-phase synchronous machine
has been wound for four-poles in 36 slots. Each coil span has an eight-slot
pitch, i.e., the distance between the coil sides of a coil has been eight slots.
Calculate the distribution factor and the pitch factor.
Solution:
