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The 400 V, 50 kVA, 0.8 power factor leading delta connected synchronous motor has synchronous reactance...

The 400 V, 50 kVA, 0.8 power factor leading delta connected synchronous motor has synchronous reactance of 3-ohm, resistance neglected. It is supplying a 12-kW load with initial power factor of 0.86 lagging. The windage and friction losses are 2.0 kW and the core losses are 1.5 kW. Determine

(a) the motor efficiency; the line current; armature current; and excitation voltage.

(b) If the flux of the motor is increased by 20 percent determine the excitation voltage; armature current; and the new power factor

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