Description:
The steady-state characteristics of a synchronous motor represented by phasor diagrams are shown as function of the load P with the excitation voltage E kept constant.The power expression is P = I V cos(;) = E V sin(;) / X. The basic phasor equation is V = E + jX I.The locus of E is a portion of a circle of radius E centered at the origin of the complex plane. The locus of I is also a circle of radius E/X centered on the imaginary axis at V/X.The power P versus the torque angle 8; is also plotted.

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