3-phase mmf
space
distribution
Under 3-phase sinusoidal excitation of an ac
machine, the field space distribution produced by each phase is a sinusoidally
distributed pulsating wave centered in its axis. The ABC [RGB] axes are 120o apart.
Under balanced conditions, the amplitudes of the 3 sliders
are equal and the resultant field (in black) is a traveling wave of
constant amplitude moving at a speed which corresponds to the excitation
frequency. Under unbalanced conditions, the resultant
field is a combination of traveling and pulsating waves.
©
M.
Riaz |