SINUSOIDALLY
DISTRIBUTED WINDINGS AND FIELDS
The stator of a 3-phase (2-pole) AC
machine may be represented by 3 sinusoidally distributed windings [RGB] whose
axes are displaced by 120o. When the windings are excited with
balanced 3-phase sinusoidal currents, each phase produces a pulsating
sinusoidal field described by a space vector directed along the winding axis
and pointing to where the field is maximum positive. The combined effect is
equivalent to having a single sinusoidally distributed winding which is excited
with a constant current and rotates at the excitation frequency. The motion of
the associated space vectors is illustrated.
