: Hi Don;

: I think that a 1HP motor will cost essentially the same to run at either
: voltage, using 0.746KVA+/hr. Magnetic flux is proportional to NI, number
: of turns x the amperage. To generate the same rotational flux at 1/2 the
: current, the motor must be rewired so twice the number of turns are
: effective. The I^2R losses in a comparison of the motors are now
: proportional to current, not exponentially related.

: I know what you were trying to say, but the largest unused energy that you
: pay for in an electric motor has to do with power factor - That is, the
: motor inductance causes a phase shift between the applied voltage and the
: resultant current. Your electric meter misinterprets what is going on, and
: you pay for more than you are actually using. Coincidentally, the 220V
: motor will have a proportionally higher inductance than a 110V motor. In
: larger shops where this amount to lots of bucks, they correct the power
: factor on each motor so that the electric company's meters read the
: correct usage. At the power levels we're talking about in a small home
: shop the savings gained from either changing voltage or correcting PF
: would be negligible - But those 220V wired motors sure seem to run
: stronger! And in my opinion, that's where your improvement in I^2R losses
: really show their importance.

: Best Regards, Spidey

Boy, that was a mouthful. Whew!! Around here, the big shops mostly use 3-phase systems, instead of single phase. I don't know what that means, but, it's something you can't get in your home garage or shop and it was tons better to run the big tools. Our Delta Unisaw ran on the 3 phase with a 5 hp. motor and 3 belt pulley and we cut 3" walnut like my craftsman cuts 1/4" plywood. No slowdown at all. Cost????????

Buuuuuuuuttt !!!! We've strayed way off the original topic, and I'm wondering if Greg was able to solve the problem with HIS saw or fence. ???

Rehd