Winding factor

Article summary

In power engineering, winding factor k_w provides a way to compare of the effectiveness of different designs of stators for alternators. "The winding factor is an operand in order to consider the effect of winding distribution and chording on the spatial distribution of the magnetic field in the air gap of synchronous and induction machines" . Accordingly, the behaviour of synchronous and induction machines can be estimated. "The main torque production or electrical power generation can easily be related to the fundamental spatial and time harmonics, whereby the effect of other spatial and time harmonics is usually negligible. Indeed, the other spatial and time harmonics may contribute to the torque pulsation, noise, and vibration excitations" besides additional losses. For most alternators, the stator acts as the armature. Practical alternators have a short-pitched and distributed windings to reduce harmonics and maintain constant torque. Also, either the stator or rotor may be slightly skewed from the rotor's axis to reduce torque ripple. The armature winding of each phase may be distributed in a number of slots for certain number of pole pairs. Since the EMF induced in different slots are not in phase, their phasor sum is less than their numerical sum. This reduction factor is called distribution factor k_d .…

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