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why the stator magnetomotive force lags behind stator armature current in salien
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khatus:
https://circuitglobe.com/two-reaction-theory-salient-pole-synchronous-machine.html?fbclid=IwAR1ODRDONC27LIL83Lvb3WohPaSrIG4BRZ8l-ATyeloZEqrZ6juKw__jNMQ

Hello guys in two reaction theory of salient pole alternator  when a lagging power factor load is connected to the armature, why the stator magnetomotive force Fs a.k.a MMF lags behind Ia(stator armature current) by angle 90 degrees??.
As                   
                    MMF = Curremt X number of turns in stator coil.
 So MMF should be in phase with armature current.

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