Power factor of 3MW Induction Motor
Power factor of 3MW Induction Motor
(OP)
Hello everyone,
Generally, PF of induction motor rated 50KW or below is 0.8 - 0.85, but can I specify the PF of a 2MW - 3MW induction motor as 0.9 or higher?
Does any manufacturer catalogue cover this information?
Thanks,
Paulpower
Generally, PF of induction motor rated 50KW or below is 0.8 - 0.85, but can I specify the PF of a 2MW - 3MW induction motor as 0.9 or higher?
Does any manufacturer catalogue cover this information?
Thanks,
Paulpower






RE: Power factor of 3MW Induction Motor
If you need a good power factor, especially on a big machine like that, then specify a synchronous motor. You can set its excitation to be VAr-neutral or use it to compensate for other lagging loads on the same bus by over-exciting it.
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RE: Power factor of 3MW Induction Motor
I'll only add the following:
Generally, a motor that big is custom built to order, so it's not likely that there are any MV motor catalogs out there with anything other than general features and manufacturing principals in it. To a certain extent, you may even be able to specify what you would like in that regard and someone can probably build it to suit. I have seen .9 pf on 4 pole motors that big.
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RE: Power factor of 3MW Induction Motor
RE: Power factor of 3MW Induction Motor
As Scotty said, you might want to consider a synchronous machine if you're really concerned about pf.
RE: Power factor of 3MW Induction Motor
A 0.9 pf would imply a smaller air-gap, which may be ruled out by mechanical considerations like sag, thermal expansion etc.
I agree with dpc that efficiency is more important than pf in a motor since pf correction techniques are available.