**SYNCHRONOUS MOTOR (part 2)**

**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(****φ****) = E V sin(****δ****) / 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 ****δ**** is also plotted.**