Tim Wescott writes:


Anything that you can do to reduce one of the above effects either costs
money, takes time to design, makes the motor bigger and/or heavier
and/or less robust, or makes some other effect worse.


Tim nailed it. It's TANSTAAFL.

You need to balance all those factors, as varied by your hours/year of use,
% of full load, $/KWH, PF charges, etc.

I recall the consulting engineer talking about spec'ing some new
1600-2000 HP pipeline motors [4160V].

He worked it out 5 ways, and then said
'....and here on, it is $$ for efficiency
...you can buy a better motor or more KWH...'

If it's a main drive motor on a carrier, the cost is ignored, but
efficiency, serviceability, and service factor [can it take 125% rated load
for 8 hours, if needed?] are king.

But at Spacely Sprockets, other issues are...

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