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Does power factor vary with speed?If yes, how?If not, why?
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Answer Posted / sivakumar cv
First we need to understand that what are the way the speed of an AC motor can be changed.
only two way either by changing the no of pole or by frequency.For a given machine only option available is changing the frequency.
Now the next question is which factor determine the power factor.
It is the amount of magnetizing current which determine the powerfactor of the machine at a particular load.So magnetizing current is controlled by adjusting the machine reluctance.
The Only variable which affects the reactance of the machine is frequency of the supply for given machine (Sice the geometry of the machine is invariable).
So if there is any change in speed by adjusting the frequency of the supply definitely there would be change in powerfactor of the machine for a given load.
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