It is conducted to calculate unsaturated Xd and Xq.
We feed subnormal voltage to armature, mechanically rotate it, keep field open ( Vf)
Here Nr is not equal to Ns.
but is almost equal to Ns.
Since mmf due to armature reaction is rotating at Ns, field poles gradually slip w.r.t. rotating armature mmf.
Thus R = 1/ u of path of mmf changes at twice slip freq. from maxm when axis of poles and axis of armature reaction wave coincide and minm. when they are at right angles.
We feed subnormal voltage to armature, mechanically rotate it, keep field open ( Vf)
Here Nr is not equal to Ns.
but is almost equal to Ns.
Since mmf due to armature reaction is rotating at Ns, field poles gradually slip w.r.t. rotating armature mmf.
Thus R = 1/ u of path of mmf changes at twice slip freq. from maxm when axis of poles and axis of armature reaction wave coincide and minm. when they are at right angles.
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