(Solved): Example 5.26. From the phasor diagram of an over-excited salient-pole synchronous motor (i.e. with ...

Example 5.26. From the phasor diagram of an over-excited salient-pole synchronous motor (i.e. with armature current leading the terminal voltage), prove the following relations : Ia (Xa cos 0 + ra sin 8) tan 8 = j?qXq V?+Ia (Xq sin 0-ra cos 0) t e and X? = V, sin 8-Iara sin (8 + 0) Ia cos (8 + 0) ix where 8 and 8 are load and power-factor angles respectively.