On 4/14/2011 11:47 PM, Home Guy wrote:
" unnecessarily full-quoted:

There is SO much wrong in your analysis, that I don't know
where to begin.

(Which is why I didn't try.)

But here's a start. You claim that with
a slightly higher voltage, an AC motor in an HVAC
compressor won't turn any faster and hence the additional
power is wasted. What you've completely overlooked is
that power is P=VI, or power is voltage times current.
Give that motor an extra half a volt and I'll bet it's
current decreases by a corresponding amount.

So why not run a 120V motor with 240 volts then?

Duh...


AC Motors are not simple loads like a resistor, but they will still
"consume" power (V x I) as a function of their supply voltage.


A motor running at a constant RPM creates a fixed amount of mechanical
power for a given load. RPM of induction motors is not very sensitive to
voltage. The electrical power used is tied to the mechanical power
consumed. Raising the voltage a little lowers the current a little.

--
bud--