why induction motor having low power factor at starting time
and high at full load.
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Answer Posted / suman pakhrin
cos∅=R∕√((R2)²+(s.X)²)
During starting,reactance of rotor is maximum Xr=X since slip=1
as load increases slip decreases and so does the reactance
as Xr=S.X therefore its obvious from above that during starting the impedance offered by rotor is more inductive as that during loading conditions!and hence power factor at start low compared to loadin conditions
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